Image forming apparatus and cartridge

Abstract

A cartridge includes a frame, a photosensitive drum, and a rack. The photosensitive drum is supported by the frame and is rotatable about an axis thereof. The rack has one or more teeth at least partially exposed in a manner facing an axis of the photosensitive drum. The rack is provided on a side portion of the cartridge in an axial direction of the photosensitive drum.

Description

Technical Field

[0001] The present invention relates to a box and an image forming apparatus using the box.

[0002] Here, a box is a device that can be attached to and detached from the main assembly of the image forming apparatus. An example is a processing box. A processing box is a box that integrates a photosensitive element and a processing device capable of acting on the photosensitive element into a unit, and the box can be detachably mounted to the main assembly of the electrophotographic image forming apparatus.

[0003] For example, a cassette that integrates at least one of a photosensitive element and a processing device (i.e., a developing device, a charging device, and a cleaning device) into a single unit can be cited. Furthermore, the image forming apparatus of this application is an electrophotographic image forming apparatus for forming an image on a recording medium using an electrophotographic image forming method.

[0004] Examples of electrophotographic image forming apparatuses include electrophotographic copiers, electrophotographic printers (LED printers, laser beam printers, etc.), fax machines, and word processors. Background Technology

[0005] In an electrophotographic image forming apparatus (hereinafter also referred to as an "image forming apparatus"), an electrophotographic photosensitive component, typically drum-shaped, serving as an image carrier (i.e., a photosensitive drum (electrophotographic photosensitive drum)), is uniformly charged. Next, an electrostatic latent image (electrostatic image) is formed on the photosensitive drum by selectively exposing the charged drum. Then, the electrostatic latent image formed on the photosensitive drum is developed into a toner image using a toner as a developer. Subsequently, the toner image formed on the photosensitive drum is transferred to a recording material such as recording paper or a plastic sheet, and the toner image transferred to the recording material is fixed onto the recording material by heating and / or pressurizing the transferred toner image, thereby performing image recording.

[0006] Such image forming apparatuses typically require toner replenishment and maintenance of various processing devices. To facilitate toner replenishment and maintenance, processing cases have been put into practical use, which assemble the photosensitive drum, charging device, developing device, cleaning device, etc., into a box-like form that can be installed into and removed from the main component of the image forming apparatus.

[0007] In practice, this processing box system allows users to perform some maintenance on the device without relying on service personnel responsible for after-sales service. This significantly improves the operability of the device and provides an image forming apparatus with excellent usability. Therefore, this processing box system is widely used in image forming apparatuses.

[0008] For example, JP-H8-328449 (see JP-H8-328449)Figure 16 As described above, the image forming apparatus generally has a drive transmission member that is pushed toward the processing box by a spring and has a connecting member at its end for transmitting drive from the main assembly of the image forming apparatus to the processing box.

[0009] When the door of the main assembly of the image forming apparatus is closed, the drive transmission member of the image forming apparatus is pressed by a spring and moves toward the processing cartridge. This engages the drive transmission member with the coupling of the processing cartridge, thereby enabling drive transmission to the processing cartridge. When the door of the main assembly of the image forming apparatus is opened, the drive transmission member moves away from the processing cartridge by a cam overcoming the force of the spring. This disengages the drive transmission member from the processing cartridge, allowing the processing cartridge to be detached from the main assembly of the image forming apparatus. Summary of the Invention

[0010] An example of an embodiment of the present invention is a box, the box comprising:

[0011] frame;

[0012] A photosensitive drum, said photosensitive drum being supported by the frame and rotatable about an axis; and

[0013] A rack having one or more teeth at least partially exposed to face the axis of the photosensitive drum, and disposed on the side of the housing relative to the axis of the photosensitive drum.

[0014] Another example of the embodiment is a box, the box comprising:

[0015] frame;

[0016] A photosensitive drum, said photosensitive drum being supported by the frame and rotatable about an axis; and

[0017] An elastic member having a surface at least partially exposed in a manner facing the axis of the photosensitive drum, the elastic member being disposed on the side of the cartridge relative to the axis of the photosensitive drum.

[0018] Another example of the embodiment is a box, the box comprising:

[0019] frame;

[0020] A photosensitive drum, said photosensitive drum being supported by the frame and rotatable about an axis; and

[0021] The friction-applying portion has a surface that is at least partially exposed in a manner facing the axis of the photosensitive drum, and is disposed on the side of the cartridge in a direction relative to the axis of the photosensitive drum.

[0022] Another example of the embodiment is a box, the box comprising:

[0023] frame;

[0024] A photosensitive drum, said photosensitive drum being supported by the frame and rotatable about an axis; and

[0025] An adhesive member having a surface at least partially exposed in a manner facing the axis of the photosensitive drum, and disposed on the side of the cartridge in a direction relative to the axis of the photosensitive drum.

[0026] Another example of the embodiment is a box, the box comprising:

[0027] frame;

[0028] A photosensitive drum, which is supported by the frame and is rotatable about its axis;

[0029] One or more movable teeth, the one or more teeth being disposed on the side of the housing relative to the axis of the photosensitive drum and at least partially exposed facing the axis of the photosensitive drum; and

[0030] A locking element for restricting the movement of the one or more teeth.

[0031] Another example of the embodiment is a box, the box comprising:

[0032] frame;

[0033] A photosensitive drum, said photosensitive drum being supported by the frame and rotatable about an axis; and

[0034] A rotatable toothed gear, the toothed gear being disposed on the side of the housing and having one or more teeth that are at least partially exposed in a manner facing the axis of the photosensitive drum.

[0035] Another example of the embodiment is a box, the box comprising:

[0036] frame;

[0037] A photosensitive drum, supported by the frame and rotatable about an axis, the photosensitive drum having a first end and a second end opposite to the first end; and

[0038] One or more movable teeth, the one or more teeth being disposed on the side of the cartridge with respect to the axis of the photosensitive drum and being at least partially exposed toward the axis of the photosensitive drum;

[0039] A spring that pushes against one or more teeth;

[0040] When viewed along the axis of the photosensitive drum,

[0041] A line extending from the axis of the photosensitive drum through one or more teeth forms an angle of -75° to 50° or 130° to 190° relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

[0042] Another example of the embodiment is a box, the box comprising:

[0043] frame;

[0044] A photosensitive drum, which is supported by the frame and is rotatable about an axis;

[0045] One or more teeth, the one or more teeth being disposed on the side of the cartridge with respect to the axis of the photosensitive drum and at least partially exposed toward the axis of the photosensitive drum; and

[0046] A movable rod, the rod being provided with one or more teeth;

[0047] When viewed along the axis of the photosensitive drum,

[0048] A line extending from the axis of the photosensitive drum through one or more teeth forms an angle of -75° to 50° or 130° to 190° relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

[0049] Another example of the embodiment is a box, the box comprising:

[0050] frame;

[0051] A photosensitive drum, supported by the frame and rotatable about an axis, the photosensitive drum having a first end and a second end opposite to the first end; and

[0052] A rotatable gear is disposed on the side of the housing in a direction relative to the axis of the photosensitive drum. The rotatable gear has one or more teeth that are at least partially exposed toward the axis of the photosensitive drum, and the rotatable gear is movable in the direction of its axis.

[0053] Another example of the embodiment is a box, the box comprising:

[0054] frame;

[0055] A photosensitive drum, said photosensitive drum being supported by the frame and rotatable about an axis; and

[0056] A rotatable gear having one or more teeth at least partially exposed toward the axis of the photosensitive drum, the rotatable gear being disposed on the side of the cartridge relative to the axis of the photosensitive drum.

[0057] The frame and the rotatable gear each have a hole, and the other has a shaft portion fitted into the hole, with a gap between the hole and the shaft portion that allows the rotatable gear to move in a direction perpendicular to its axis.

[0058] Another example of the embodiment is a box, the box comprising:

[0059] frame;

[0060] A photosensitive drum, said photosensitive drum being supported by the frame and rotatable about an axis; and

[0061] A rotatable belt is disposed on the side of the cartridge in a direction relative to the axis of the photosensitive drum, the belt having a surface that is at least partially exposed to the outside in a manner facing the axis of the photosensitive drum.

[0062] According to some preferred embodiments of the present invention, the above-described conventional technology can be further developed. Attached Figure Description

[0063] Figure 1 part (a) and Figure 1 Part (b) is a diagram of the drive transmission section of the processing box according to Embodiment 1.

[0064] Figure 2 This is a cross-sectional view of the main component and processing box of the image forming apparatus according to Embodiment 1.

[0065] Figure 3 This is a cross-sectional view of the processing box according to Example 1.

[0066] Figure 4 This is an exploded perspective view of the processing box according to Example 1.

[0067] Figure 5 This is an exploded perspective view of the processing box according to Example 1.

[0068] Figure 6 (a) of Figure 6 Part (b) and Figure 6 Part (c) is a diagram of the link portion of the electrophotographic image forming apparatus according to Embodiment 1.

[0069] Figure 7 part (a) and Figure 7Part (b) is a diagram of the link portion of the electrophotographic image forming apparatus according to Embodiment 1.

[0070] Figure 8 part (a) and Figure 8 Part (b) is a cross-sectional view of the guide portion of the electrophotographic image forming apparatus according to Embodiment 1.

[0071] Figure 9 This is an illustration of the drive system portion of the electrophotographic image forming apparatus according to Embodiment 1.

[0072] Figure 10 part (a) and Figure 10 Part (b) is a diagram of the longitudinal positioning portion of the electrophotographic image forming apparatus according to Embodiment 1.

[0073] Figure 11 part (a) and Figure 11 Part (b) is a cross-sectional view of the positioning portion of the electrophotographic image forming apparatus according to Embodiment 1.

[0074] Figure 12 part (a) and Figure 12 Part (b) is a diagram of the link portion of the electrophotographic image forming apparatus according to Embodiment 1.

[0075] Figure 13 part (a) and Figure 13 Part (b) is a perspective view of the drive transmission portion of the electrophotographic image forming apparatus according to Embodiment 1.

[0076] Figure 14 This is a perspective view of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 1.

[0077] Figure 15 This is a cross-sectional view of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 1.

[0078] Figure 16 This is a diagram of the drive system of the processing box according to Embodiment 1.

[0079] Figure 17 This is a cross-sectional view of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 1.

[0080] Figure 18 part (a) and Figure 18 Part (b) is a cross-sectional view of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 1.

[0081] Figure 19 part (a) and Figure 19Part (b) is a cross-sectional view of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 1.

[0082] Figure 20 This is a cross-sectional view of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 1.

[0083] Figure 21 This is a cross-sectional view of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 1.

[0084] Figure 22 This is a diagram of the drive system of the processing box according to Embodiment 1.

[0085] Figure 23 This is a perspective view of the processing box according to Embodiment 2.

[0086] Figure 24 part (a) and Figure 24 Part (b) is a diagram of the drive system of the processing box according to Embodiment 2.

[0087] Figure 25 part (a) and Figure 25 Part (b) is a diagram of the rack and pinion mechanism of the processing box according to Embodiment 2.

[0088] Figure 26 (a) of Figure 26 Part (b) and Figure 26 Part (c) is a diagram of the rack and pinion mechanism of the processing box according to Embodiment 2.

[0089] Figure 27 (a) of Figure 27 Part (b) and Figure 27 Part (c) is a diagram of the rack and pinion mechanism of the processing box according to Embodiment 2.

[0090] Figure 28 part (a) and Figure 28 Part (b) is a diagram of the rack and pinion mechanism of the processing box according to Embodiment 2.

[0091] Figure 29 part (a) and Figure 29 Part (b) is a diagram illustrating the arrangement of the rack and pinion mechanism of the processing box according to Embodiment 2.

[0092] Figure 30 (a) of Figure 30 (b) of Figure 30 Part (c) and Figure 30 Part (d) is a cross-sectional view showing the operation of the rack and pinion mechanism of the processing box according to Embodiment 2.

[0093] Figure 31 part (a) and Figure 31 Part (b) is a diagram of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 2.

[0094] Figure 32 (a) of Figure 32 Part (b) and Figure 32 Part (c) is a cross-sectional view of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 2.

[0095] Figure 33 part (a) and Figure 33 Part (b) is a cross-sectional view of an electrophotographic image forming apparatus showing the process of installing the processing box according to Embodiment 2.

[0096] Figure 34 part (a) and Figure 34 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 2.

[0097] Figure 35 (a) of Figure 35 Part (b) and Figure 35 Part (c) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 2.

[0098] Figure 36 part (a) and Figure 36 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 2.

[0099] Figure 37 (a) of Figure 37 (b) of Figure 37 Part (c) and Figure 37 Part (d) is a cross-sectional view of an electrophotographic image forming apparatus showing the process of disassembling the processing box according to Embodiment 2.

[0100] Figure 38 This is a cross-sectional view of the electrophotographic image forming apparatus according to Embodiment 2.

[0101] Figure 39 part (a) and Figure 39 Part (b) is an illustration of the first variant of Example 2.

[0102] Figure 40 part (a) and Figure 40 Part (b) is an illustration of a second variant of Example 2.

[0103] Figure 41 This is a perspective view of the processing box according to Embodiment 3.

[0104] Figure 42 part (a) and Figure 42 Part (b) is a diagram illustrating the arrangement of the frictional force application surface of the processing box according to Example 3.

[0105] Figure 43 part (a) and Figure 43 Part (b) is a diagram of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 3.

[0106] Figure 44 part (a) and Figure 44 Part (b) is a cross-sectional view of an electrophotographic image forming apparatus showing the process of installing the processing box according to Embodiment 3.

[0107] Figure 45 part (a) and Figure 45 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 3.

[0108] Figure 46 part (a) and Figure 46 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 3.

[0109] Figure 47 part (a) and Figure 47 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 3.

[0110] Figure 48 (a) of Figure 48 Part (b) and Figure 48 Part (c) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 3.

[0111] Figure 49 part (a) and Figure 49 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 3.

[0112] Figure 50 part (a) and Figure 50 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 3.

[0113] Figure 51Part (a) is a diagram illustrating a method for measuring the coefficient of friction. Figure 51 Part (b) is a diagram illustrating the method used to measure the degree of elasticity.

[0114] Figure 52 This is a perspective view of the processing box according to Embodiment 4.

[0115] Figure 53 part (a) and Figure 53 Part (b) is a diagram illustrating the arrangement of the elastic rotatable components of the processing box according to Embodiment 4.

[0116] Figure 54 part (a) and Figure 54 Part (b) is a cross-sectional view of the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 4.

[0117] Figure 55 This is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 4.

[0118] Figure 56 This is a perspective view of the processing box according to Embodiment 5.

[0119] Figure 57 part (a) and Figure 57 Part (b) is a diagram of the toothed gear mechanism of the processing box according to Embodiment 5.

[0120] Figure 58 part (a) and Figure 58 Part (b) is a diagram of the toothed gear mechanism of the processing box according to Embodiment 5.

[0121] Figure 59 (a) of Figure 59 Part (b) and Figure 59 Part (c) is a diagram of the toothed gear mechanism of the processing box according to Embodiment 5.

[0122] Figure 60 part (a) and Figure 60 Part (b) is a diagram illustrating the arrangement of the toothed gear mechanism of the processing box according to Embodiment 5.

[0123] Figure 61 part (a) and Figure 61 Part (b) is a cross-sectional view showing the operation of the toothed gear mechanism of the processing box according to Embodiment 5.

[0124] Figure 62 part (a) and Figure 62 Part (b) is a cross-sectional view of an electrophotographic image forming apparatus showing the process of installing the processing box according to Embodiment 5.

[0125] Figure 63 part (a) and Figure 63 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 5.

[0126] Figure 64 part (a) and Figure 64 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 5.

[0127] Figure 65 (a) of Figure 65 Part (b) and Figure 65 Part (c) is a cross-sectional view of an electrophotographic image forming apparatus showing the process of disassembling the processing box according to Embodiment 5.

[0128] Figure 66 part (a) and Figure 66 Part (b) is an illustration of the first variant of Example 5.

[0129] Figure 67 This is a perspective view of the processing box according to Embodiment 6.

[0130] Figure 68 part (a) and Figure 68 Part (b) is a diagram of the rotatable rack and pinion mechanism of the processing box according to Embodiment 6.

[0131] Figure 69 part (a) and Figure 69 Part (b) is a diagram of the rotatable rack and pinion mechanism of the processing box according to Embodiment 6.

[0132] Figure 70 part (a) and Figure 70 Part (b) is a diagram illustrating the operation of the rotatable rack and pinion mechanism of the processing box according to Embodiment 6.

[0133] Figure 71 (a) of Figure 71 (b) of Figure 71 Part (c) and Figure 71 Part (d) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 6.

[0134] Figure 72 (a) of Figure 72 (b) of Figure 72 Part (c) and Figure 72Part (d) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 6.

[0135] Figure 73 part (a) and Figure 73 Part (b) is an illustration of the first variant of Example 6.

[0136] Figure 74 This is a perspective view of the processing box according to Embodiment 7.

[0137] Figure 75 part (a) and Figure 75 Part (b) is a diagram of the pushing mechanism of the processing box according to Embodiment 7.

[0138] Figure 76 part (a) and Figure 76 Part (b) is a diagram illustrating the arrangement of the pushing mechanism of the processing box according to Embodiment 7.

[0139] Figure 77 part (a) and Figure 77 Part (b) is a cross-sectional view showing the operation of the pushing mechanism of the processing box according to Embodiment 7.

[0140] Figure 78 part (a) and Figure 78 Part (b) is a cross-sectional view of an electrophotographic image forming apparatus showing the process of installing the processing box according to Embodiment 7.

[0141] Figure 79 part (a) and Figure 79 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 7.

[0142] Figure 80 (a) of Figure 80 Part (b) and Figure 80 Part (c) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 7.

[0143] Figure 81 This is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 7.

[0144] Figure 82 part (a) and Figure 82 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 7.

[0145] Figure 83 This is a perspective view of the processing box according to the first variant of Embodiment 7.

[0146] Figure 84 This is a diagram of the processing box according to the first variant of Example 7.

[0147] Figure 85 This is an illustration of the locking member of the processing box according to the first variant of Embodiment 7.

[0148] Figure 86 part (a) and Figure 86 Part (b) is a diagram of the locking element of the processing box according to the first variant of Embodiment 7.

[0149] Figure 87 part (a) and Figure 87 Part (b) is an illustration of the protrusion of the processing box according to the first variant of Example 7.

[0150] Figure 88 part (a) and Figure 88 Part (b) is a diagram of the locking element of the processing box according to the first variant of Embodiment 7.

[0151] Figure 89 part (a) and Figure 89 Part (b) is an illustration of the protrusion of the processing box according to the first variant of Example 7.

[0152] Figure 90 (a) of Figure 90 (b) of Figure 90 Part (c) and Figure 90 Part (d) is a diagram illustrating the locking operation of the processing box according to the first variant of Embodiment 7.

[0153] Figure 91 part (a) and Figure 91 Part (b) is a cross-sectional view showing the operation of the opening and closing of the door of the electrophotographic image forming apparatus according to the first variant of Embodiment 7.

[0154] Figure 92 Parts (a) to (l) are illustrations of the operation of the drive transmission section of the electrophotographic image forming apparatus according to the first variant of Embodiment 7.

[0155] Figure 93 part (a) and Figure 93 Part (b) is a diagram illustrating the operation of the drive transmission section of the electrophotographic image forming apparatus according to the first variant of Embodiment 7.

[0156] Figure 94 This is a perspective view of the processing box according to the second variant of Example 7.

[0157] Figure 95 This is a diagram of the engagement mechanism of the processing box according to the second variant of Embodiment 7.

[0158] Figure 96 part (a) and Figure 96 Part (b) is a diagram of the engagement mechanism of the processing box according to the second variant of embodiment 7.

[0159] Figure 97 Parts (a) to (f) are illustrations of the engagement mechanism of the processing box according to the second variant of Embodiment 7.

[0160] Figure 98 part (a) and Figure 98 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to the second variant of Embodiment 7.

[0161] Figure 99 Parts (a) to (f) are illustrations of the engagement mechanism of the processing box according to the second variant of Embodiment 7.

[0162] Figure 100 part (a) and Figure 100 Part (b) is a diagram illustrating the operation of the drive transmission section of the electrophotographic image forming apparatus according to the second variant of Embodiment 7.

[0163] Figure 101 This is a diagram of the drive system of the processing box according to the second variant of Embodiment 7.

[0164] Figure 102 This is a perspective view of the processing box according to Embodiment 8.

[0165] Figure 103 This is a diagram of the engagement mechanism of the processing box according to Embodiment 8.

[0166] Figure 104 part (a) and Figure 104 Part (b) is a diagram of the engagement mechanism of the processing box according to Embodiment 8.

[0167] Figure 105 part (a) and Figure 105 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 8.

[0168] Figure 106 This is a diagram of the engagement mechanism of the processing box according to the first variant of Embodiment 8.

[0169] Figure 107 part (a) and Figure 107Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to the first variant of Embodiment 8.

[0170] Figure 108 This is a diagram of the engagement mechanism of the processing box according to the second variant of Embodiment 8.

[0171] Figure 109 This is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to a second variant of Embodiment 8.

[0172] Figure 110 This is a diagram of the engagement mechanism of the processing box according to the third variant of Embodiment 8.

[0173] Figure 111 This is a perspective view of the processing box according to Example 9.

[0174] Figure 112 part (a) and Figure 112 Part (b) is a diagram of the load application mechanism of the processing box according to Example 9.

[0175] Figure 113 part (a) and Figure 113 Part (b) is a diagram of the load application mechanism of the processing box according to Example 9.

[0176] Figure 114 part (a) and Figure 114 Part (b) is a cross-sectional view showing the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 9.

[0177] Figure 115 (a) of Figure 115 Part (b) and Figure 115 Part (c) is a diagram illustrating the operation of the drive transmission section of the electrophotographic image forming apparatus according to Embodiment 9.

[0178] Figure 116 (a) of Figure 116 Part (b) and Figure 116 Part (c) is an illustration of the first variant of Example 9.

[0179] Figure 117 (a) of Figure 117 Part (b) and Figure 117 Part (c) is an illustration of the second variant of Example 9.

[0180] Figure 118 Part (a) is a perspective view of the box, and Figure 118 Part (b) is an exploded perspective view of the box.

[0181] Figure 119 Part (a) is a side view of the box, and Figure 119 Part (b) is a cross-sectional view of the box.

[0182] Figure 120 This is a diagram of the drive transmission component.

[0183] Figure 121 This is a diagram of the box and the drive transmission components.

[0184] Figure 122 This is a diagram of the drive transmission component.

[0185] Figure 123 Part (a) is a diagram of the drive transmission component, and Figure 123 Part (b) is a diagram of the box and the drive transmission components.

[0186] Figure 124 Part (a) is a diagram of the drive transmission component, and Figure 124 Part (b) is a diagram of the box and the drive transmission components.

[0187] Figure 125 Part (a) is a diagram of the drive transmission component, and Figure 125 Part (b) is a diagram of the box and the drive transmission components.

[0188] Figure 126 Part (a) is a diagram of the drive transmission component, and Figure 126 Part (b) is a diagram of the box and the drive transmission components.

[0189] Figure 127 Part (a) is a diagram of the drive transmission component, and Figure 127 Part (b) is a diagram of the box and the drive transmission components.

[0190] Figure 128 Part (a) is a perspective view of the box, and Figure 128 Part (b) is a side view of the box.

[0191] Figure 129 Part (a) is a perspective view of the box, and Figure 129 Part (b) is a perspective view of the box.

[0192] Figure 130 Part (a) is an exploded perspective view of the box, and Figure 130 Part (b) is an exploded perspective view of the box.

[0193] Figure 131 part (a) and Figure 131 Part (b) is a view showing the control components.

[0194] Figure 132 part (a) and Figure 132 Part (b) is a side view of the box.

[0195] Figure 133 Part (a) is a cross-sectional view of the box showing the positional relationship of the control components, and Figure 133 Part (b) is a view showing the control components.

[0196] Figure 134 Part (a) is a side view of the box, and Figure 134 Part (b) is a view taken from the front, showing the box and drive transmission components.

[0197] Figure 135 This is a side view of the box.

[0198] Figure 136 This is a side view of the box.

[0199] Figure 137 This is a side view of the box.

[0200] Figure 138 This is a side view of the box.

[0201] Figure 139 This is a side view of the box.

[0202] Figure 140 part (a) and Figure 140 Part (b) is a side view of the box.

[0203] Figure 141 This is a cross-sectional view of the main components and the housing of the image forming apparatus.

[0204] Figure 142 This is a cross-sectional view of the box.

[0205] Figure 143 part (a) and Figure 143 Part (b) is a perspective view of the image forming apparatus when the door is open and closed.

[0206] Figure 144 This is a cross-sectional view of the drive transmission component when the door is closed.

[0207] Figure 145 It is a perspective view of the area near the cylindrical cam when the door is open.

[0208] Figure 146 part (a) and Figure 146 Part (b) is a cross-sectional view of the image forming apparatus when the box is mounted.

[0209] Figure 147 This is a perspective view of the drive side of the box.

[0210] Figure 148 part (a) and Figure 148 Part (b) is a cross-sectional view of the image forming apparatus, showing the box pressing part and the positioning part.

[0211] Figure 149 This is a perspective view of the drive transmission component.

[0212] Figure 150 It is a cross-sectional view showing the direction of thrust movement of the drive transmission member when the connecting parts are engaged.

[0213] Figure 151 It is a cross-sectional view showing the peripheral portion of the drive transmission member when the coupling is engaged.

[0214] Figure 152 This is a perspective view showing the support structure of the bearing for the drive transmission component on the drive side.

[0215] Figure 153 part (a) and Figure 153 Part (b) is a cross-sectional view showing the orientation of the drive transmission component.

[0216] Figure 154 It is a cross-sectional view showing the posture of the drive transmission component when the door is open.

[0217] Figure 155 part (a) and Figure 155 Part (b) is a perspective view showing the control components of the box.

[0218] Figure 156 It is a cross-sectional view showing the tilting movement of the drive transmission component during the installation of the box.

[0219] Figure 157 part (a) and Figure 157 Part (b) is a perspective view showing the drive transmission member and the cover portion.

[0220] Figure 158 This is a cross-sectional view showing the operation of the control components during the installation and removal of the box.

[0221] Figure 159 This is a top view of the box.

[0222] Figure 160 This is a side view of the box.

[0223] Figure 161 This is a cross-sectional view of the box.

[0224] Figure 162 This is a top view of the box.

[0225] Figure 163 This is a perspective view of the box.

[0226] Figure 164 This is a cross-sectional view of the main components of the box and image forming apparatus.

[0227] Figure 165 This is a cross-sectional view of the box.

[0228] Figure 166 This is a perspective view of the box.

[0229] Figure 167 This is a perspective view of the box.

[0230] Figure 168 This is a cross-sectional view of some parts when viewed from the non-driving side.

[0231] Figure 169 This is a diagram showing the arrangement of rack and pinion gears.

[0232] Figure 170 This is a diagram showing the arrangement of rack and pinion gears.

[0233] Figure 171 This is a side view of the box as seen from the drive side.

[0234] Figure 172 part (a) and Figure 172 Part (b) is a side view of the gear section and the processing box when viewed from the drive side.

[0235] Figure 173 This is a side view of the box as seen from the drive side.

[0236] Figure 174 part (a) and Figure 174 Part (b) is a cross-sectional view of the main assembly of the device and box ZB.

[0237] Figure 175 This is a cross-sectional view of some parts when viewed from the non-driving side.

[0238] Figure 176 This is a side view of the drive transmission component.

[0239] Figure 177 It is a cross-sectional view of the main components and the box of the device.

[0240] Figure 178 It is a cross-sectional view of the main components and the box of the device.

[0241] Figure 179 This is a side view of the box as seen from the drive side.

[0242] Figure 180 part (a) and Figure 180 Part (b) is a cross-sectional view of some parts when viewed from the non-driving side.

[0243] Figure 181 This is a cross-sectional view of the main components of the device and box ZB.

[0244] Figure 182 This is an enlarged cross-sectional view of one tooth of the gear.

[0245] Figure 183 It is a cross-sectional view of the main components and the box of the device. Detailed Implementation

[0246] <Example 1>

[0247] Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0248] The rotation axis of the electrophotographic drum is in the longitudinal direction.

[0249] In addition, in the longitudinal direction, the side of the electrophotographic photosensitive drum that receives driving force from the main component of the image forming apparatus is called the driving side, and the side opposite to it is the non-driving side.

[0250] Reference Figure 2 and Figure 3 This will describe the overall structure and image formation process.

[0251] Figure 2 This is a cross-sectional view of the main component (main component of the electrophotographic image forming apparatus, main component of the image forming apparatus) A and the processing box (hereinafter referred to as box B) of the electrophotographic image forming apparatus according to an embodiment of the present invention.

[0252] Figure 3 This is a cross-sectional view of box B.

[0253] Here, the main component A of the apparatus is the part of the electrophotographic image forming apparatus other than the box B.

[0254] <Overall Structure of Electrophotographic Image Forming Apparatus>

[0255] Figure 2 The illustrated electrophotographic image forming apparatus (image forming apparatus) is a laser beam printer using electrophotographic processing, wherein cartridge B is detachably attached to the main assembly A. The exposure unit 3 (laser scanner unit) is configured to form a latent image on the electrophotographic photosensitive drum 62, which serves as the image carrier of cartridge B, when cartridge B is attached to the main assembly A. Additionally, a sheet tray 4 is provided below cartridge B, storing recording material (hereinafter referred to as sheet PA) to be used for image formation. The electrophotographic photosensitive drum 62 is a photosensitive component (electrophotographic photosensitive component) used for electrophotographic image formation.

[0256] Furthermore, in the main component A of the device, along the feeding direction D of the sheet PA, there are sequentially arranged a pickup roller 5a, a feed roller pair 5b, a transfer roller pair 5c, a transfer guide 6, a transfer roller 7, a feed guide 8, a fixing device 9, an exhaust roller pair 10, and an exhaust tray 11. The fixing device 9 includes a heating roller 9a and a pressure roller 9b.

[0257] Image Formation Processing

[0258] Next, an overview of the image forming process will be described. Based on the print start signal, the electrophotographic photosensitive drum (hereinafter referred to as photosensitive drum 62 or simply drum 62) is driven to rotate at a predetermined circumferential speed (processing speed) in the direction of arrow R.

[0259] A biased charging roller (charging component) 66 contacts the outer peripheral surface of the drum 62 and charges the outer peripheral surface of the drum 62 uniformly.

[0260] Exposure device 3 outputs a laser beam L corresponding to the image information. The laser beam L passes through a laser opening 71h provided in the cleaning frame 71 of housing B and scans and exposes the outer peripheral surface of drum 62. As a result, an electrostatic latent image corresponding to the image information is formed on the outer peripheral surface of drum 62.

[0261] On the other hand, such as Figure 3 As shown, in the developing unit 20, which is a developing apparatus, the toner T in the toner chamber 29 is stirred and fed by the rotation of the feed member (stirring member) 43, and is supplied to the toner supply chamber 28.

[0262] The toner T is carried on the surface of the developing roller 32 by the magnetic force of the magnetic roller 34 (fixed magnet). The developing roller 32 is a developing agent carrying member used to carry the developing agent (toner T) on its surface in order to develop the latent image formed on the drum 62.

[0263] The toner T is triboelectrically charged by the developing blade 42, and the thickness of the toner layer on the outer peripheral surface of the developing roller 32, which serves as the developer carrier, is controlled.

[0264] Toner T is supplied to drum 62 according to the electrostatic latent image, and the latent image is developed. As a result, the latent image is visualized as a toner image. Drum 62 is an image-carrying component used to hold the latent image and the image formed by the toner (toner image, developer image) on its surface. Figure 2 As shown, according to the output timing of laser L, sheet PA stored in the lower part of the main assembly A is fed from sheet tray 4 via pick-up roller 5a, feed roller pair 5b, and transfer roller pair 5c. Then, sheet PA is conveyed to the transfer position between drum 62 and transfer roller 7 via transfer guide 6. At this transfer position, the toner image is sequentially transferred from drum 62 onto sheet PA.

[0265] The sheet PA, already printed with the toner image, separates from the drum 62 and is conveyed along the feed guide 8 to the fixing unit 9. The sheet PA then passes through a clamping portion between the heating roller 9a and the pressure roller 9b that constitute the fixing unit 9. In this clamping portion, a fixing process involving pressure and heat is performed, and the toner image is fixed onto the sheet PA. The sheet PA with the toner image fixed onto it is fed to the discharge roller pair 10 for discharge onto the discharge tray 11.

[0266] On the other hand, such as Figure 3 As shown, residual toner remaining on the outer peripheral surface of drum 62 after image transfer is removed by cleaning member 77 and reused in the image forming process. The toner removed from drum 62 is stored in waste toner chamber 71b of cleaning unit 60. Cleaning unit 60 is a unit that includes drum 62.

[0267] In the above text, the charging roller 66, the developing roller 32, the transfer roller 7, and the cleaning component 77 are processing devices that can act on the drum 62.

[0268] <Overall structure of the box>

[0269] Next, we will refer to Figure 3 , Figure 4 and Figure 5 Describe the overall structure of box B. Figure 3 It is a cross-sectional view of box B, and Figure 4 and Figure 5 This is a perspective view showing the structure of box B. In this embodiment, the screws used to connect the various parts will be omitted.

[0270] Box B includes a cleaning unit (photosensitive component holding unit, drum holding unit, image carrier holding unit) 60 and a developing unit (developer carrier holding unit) 20. One of the cleaning unit 60 and the developing unit 20 may be referred to as the first unit, and the other may be referred to as the second unit.

[0271] Typically, a processing cartridge is a housing that integrates an electrophotographic photosensitive element and at least one processing device capable of acting on the electrophotographic photosensitive element, and this housing is detachable from the main assembly of the electrophotographic image forming apparatus (the main assembly of the apparatus). Examples of processing devices include charging devices, developing devices, and cleaning devices. In this embodiment, the individual electrophotographic photosensitive elements and processing devices are supported by a cartridge frame.

[0272] like Figure 3As shown, the cleaning unit 60 includes a drum 62 as an electrophotographic photosensitive component, a charging roller 66 as a charging device, a cleaning component 77 as a cleaning device, and a cleaning frame 71 supporting these components. On the drive side of the drum 62, a drive-side drum flange 63 is rotatably supported by a hole 73a in a drum bearing 73. In a broader sense, the drum bearing 73 and the cleaning frame 71 can be collectively referred to as the cleaning frame. The drum bearing 73 and the cleaning frame 71 form the frame of the cleaning unit 60. The drum bearing 73 and the cleaning frame 71 are also part of the frame of the housing. The drum 62 is rotatably supported by the frame.

[0273] like Figure 5 As shown, on the non-drive side, the hole (not shown) in the non-drive side drum flange is rotatably supported by a drum shaft 78 provided in a hole 71c in the cleaning frame 71 by press fitting.

[0274] Each drum flange is a supported part that is rotatably supported by a bearing portion.

[0275] In the cleaning unit 60, the charging roller 66 and the cleaning component 77 are arranged to contact the outer peripheral surface of the drum 62.

[0276] The cleaning component 77 includes a rubber scraper 77a and a support component 77b supporting the rubber scraper. The rubber scraper 77a is a scraper-shaped elastic component made of rubber as an elastic material. The rubber scraper 77a abuts against the drum 62 in a direction opposite to the rotation direction of the drum 62. That is, the rubber scraper 77a abuts against the drum 62 such that its free end surface faces the upstream side of the rotation direction of the drum 62.

[0277] like Figure 3 As shown, waste toner removed from the surface of drum 62 by cleaning member 77 is stored in waste toner chamber 71b defined by cleaning frame 71 and cleaning member 77.

[0278] In addition, such as Figure 3 As shown, a receiving plate 65 for preventing waste toner from leaking from the cleaning frame 71 is disposed on the edge of the cleaning frame 71 in a manner that abuts against the drum 62.

[0279] The charging rollers 66 are rotatably mounted in the cleaning unit 60 at opposite ends of the cleaning frame 71 in the longitudinal direction via charging roller bearings (not shown).

[0280] The longitudinal direction of the cleaning frame 71 (the longitudinal direction of box B) is approximately parallel to the direction in which the axis of rotation of the drum 62 extends (axial direction). Therefore, in the following text, unless otherwise specified, "longitudinal direction" or "axial direction" refers to the axial direction of the drum 62.

[0281] The charging roller 66 is pressed against the drum 62 by the pushing member 68 via the charging roller bearing 67. The charging roller 66 rotates in response to the rotation of the drum 62.

[0282] like Figure 3 As shown, the developing unit 20 includes a developing roller 32, a developing container 23 supporting the developing roller 32, a developing blade 42, etc. The developing roller 32 is supported by bearing members 27 located at its opposite ends. Figure 5 ) and bearing component 37 ( Figure 4 It is rotatably mounted in the developing container 23. The developing container 23, bearing member 27, and bearing member 37 form the frame of the developing unit 20. Like the drum bearing 73 and the cleaning frame 71, the developing container 23, bearing member 27, and bearing member 37 are also components of the cartridge frame.

[0283] One of the frames of the cleaning unit 60 and the developing unit 20 may be referred to as the first frame, and the other may be referred to as the second frame. The frames of the cleaning unit 60 and the developing unit 20 may simply be collectively referred to as frames. In this embodiment, the cartridge frame is divided into the cleaning unit 60 frame and the developing unit 20 frame, but it is not necessarily limited to this structure. The cartridge frame may include two or more frames, or it may not be separable into multiple frames.

[0284] A magnetic roller 34 is provided in the developing roller 32. In the developing unit 20, a developing doctor blade 42 is configured to restrict the toner layer on the developing roller 32. Figure 4 and Figure 5 As shown, the developing roller 32 has spacer members 38 at its two opposite ends, and the spacer members 38 contact the drum 62 so that the developing roller 32 is held with a small gap between the drum 62 and the developing roller 32. Figure 3 As shown, a blowout shield 33 for preventing toner leakage from the developing unit 20 is disposed on the edge of the bottom member 22 in contact with the developing roller 32. Additionally, a feed member 43 is disposed in the toner chamber 29 defined by the developing container 23 and the bottom member 22. The feed member 43 agitates the toner contained in the toner chamber 29 and delivers the toner to the toner supply chamber 28.

[0285] like Figure 4 and Figure 5 As shown, cartridge B is constructed by combining cleaning unit 60 and developing unit 20.

[0286] When assembling the developing unit and the cleaning unit, the center of the first developer support boss 26a of the developing container 23 is first aligned with the first suspension hole 71i on the drive side of the cleaning frame 71, and the center of the second developing support boss 23b is aligned with the second suspension hole 71j on the non-drive side. Specifically, the first developing support boss 26a and the second developing support boss 23b are fitted into the first suspension hole 71i and the second suspension hole 71j by moving the developing unit 20 in the direction of arrow G. Thus, the developing unit 20 is movably connected to the cleaning unit 60. More specifically, the developing unit 20 is rotatably (pivotably) connected to the cleaning unit 60. Thereafter, the drum bearing 73 is attached to the cleaning unit 60 to form cartridge B.

[0287] Additionally, the first end 46La of the drive-side pushing member 46L is fixed to the surface 23c of the developing container 23, and the second end 46Lb abuts against the surface 71k, which is part of the cleaning unit.

[0288] In addition, the first end 46Ra of the non-drive side push member 46R is fixed to the surface 23k of the developing container 23, and its second end 46Rb abuts against the surface 71l, which is part of the cleaning unit.

[0289] In this embodiment, the drive-side pushing member 46L ( Figure 5 ) and non-drive side push member 46R ( Figure 4 These springs are in the form of compression springs. The pushing force of these springs allows the driven-side pushing member 46L and the non-driven-side pushing member 46R to push the developing unit 20 against the cleaning unit 60, thereby reliably pressing the developing roller 32 toward the drum 62. Furthermore, the developing roller 32 is maintained at a predetermined distance from the drum 62 by spacer members 38 attached to the opposite ends of the developing roller 32.

[0290] <Box Installation>

[0291] Next, we will refer to Figure 1 part (a) and Figure 1 (b) of Figure 6 (a) of Figure 6 (b) of Figure 6 Part (c) Figure 7 (a) of Figure 8 (a) of Figure 8 (b) of Figure 9 , Figure 10 (a) of Figure 10 (b) of Figure 11 (a) of Figure 11 (b) of Figure 12 (a) of Figure 12 (b) of Figure 13 (a) of Figure 13 (b) of Figure 14 , Figure 15 as well as Figure 16 Let me explain the installation of the box in detail.

[0292] Figure 1 part (a) and Figure 1 Part (b) is a perspective view of the box, used to show the shape of the drive transmission section and its surroundings. Figure 6 Part (a) is a perspective view of the cylindrical cam. Figure 6 Part (b) is a perspective view of the drive side panel as seen from the outside of the main assembly A of the device, and Figure 6 Part (c) is a cross-sectional view of the drive side plate with the cylindrical cam attached (by... Figure 6 The arrows in part (b) indicate the direction.

[0293] Figure 7 Part (a) is a cross-sectional view of the link portion of the image forming apparatus used to illustrate the link structure, and Figure 7 Part (b) is a cross-sectional view of the drive section of the image forming apparatus used to show the movement of the drive transmission member.

[0294] Figure 8 Part (a) is a cross-sectional view of the image forming apparatus drive side guide section used to show the installation of the box, and Figure 8 Part (b) is a cross-sectional view of the non-drive side guide portion of the image forming apparatus used to show the installation of the box.

[0295] Figure 9 This is a diagram of the drive system of an image forming apparatus, used to show the positional relationship of the drive system before the door closes.

[0296] Figure 10 Part (a) is an illustration of the positioning portion of the image forming apparatus before it is to be joined, used to show the longitudinal positioning of the processing box B.

[0297] Figure 10 Part (b) is an illustration of the positioning portion of the image forming apparatus after joining, used to show the positioning of the processing box B in the longitudinal direction.

[0298] Figure 11 Part (a) is a cross-sectional view of the drive side of the image forming apparatus, used to show the positioning of the cartridge.

[0299] Figure 11 Part (b) is a cross-sectional view of the non-driven side of the image forming apparatus, used to show the positioning of the cartridge.

[0300] Figure 12Part (a) is a cross-sectional view of the link portion of the image forming apparatus used to illustrate the link structure, and Figure 12 Part (b) is a cross-sectional view of the drive portion of the image forming apparatus used to illustrate the movement of the drive transmission member.

[0301] Figure 13 Part (a) is a perspective view of the drive transmission component, used to show the shape of the drive transmission component.

[0302] Figure 13 Part (b) is a diagram of the drive transmission section of the main component A of the device, used to illustrate the drive transmission section.

[0303] Figure 14 This is a perspective view of the driving section of the image forming apparatus, used to show the engagement space of the driving transmission section.

[0304] Figure 15 This is a cross-sectional view of the drive transmission component, used to illustrate the engagement space of the drive transmission component.

[0305] Figure 16 This is a cross-sectional view of drum 62 and its surroundings in the main assembly A of the device, used to show the arrangement of the developing roller gears.

[0306] Figure 17 This is a cross-sectional view of the drive transmission component, used to illustrate the engagement of the drive transmission component.

[0307] First, the open / closed state of the door of the main component A of the device will be described. For example... Figure 7 As shown in part (a), the main assembly A of the device includes an opening / closing door 13, a rotatable cam link 85, a cylindrical cam 86, box pressing members 1 and 2, box pressing springs 19 and 21, and a front plate 18. Figure 7 As shown in part (b), the main assembly A of the device is provided with a drive transmission member bearing 83, a drive transmission member 81, a drive transmission member spring 84, a drive side plate 15, and a non-drive side plate 16 (see [reference]). Figure 10 (part (a)).

[0308] The opening and closing door 13 is rotatably mounted to the drive side plate 15 and the non-drive side plate 16. For example... Figure 6 (a) of Figure 6 Part (b) and Figure 6As shown in section (c), the cylindrical cam 86 is rotatably attached to the drive side plate 15 and is movable in the longitudinal direction AM. It has two inclined surfaces 86a and 86b, and an end 86c continuous with the inclined surfaces on the non-drive side in the longitudinal direction. The drive side plate 15 has two inclined surfaces 15d and 15e facing the two inclined surfaces 86a and 86b, and an end face 15f facing the end 86c of the cylindrical cam 86.

[0309] like Figure 7 As shown in part (a), the rotatable cam link 85 has bosses 85a and 85b at both ends. Bosses 85a and 85b are rotatably mounted to mounting holes 13a in the opening / closing door 13 and 86e in the cylindrical cam 86, respectively. When the opening / closing door 13 rotates to open, the rotatable cam link 85 moves in conjunction with the opening / closing door 13. This movement of the rotatable cam link 85 causes the cylindrical cam 86 to rotate, such that the inclined surfaces 86a and 86b initially contact the inclined surfaces 15d and 15e, respectively, on the drive side plate 15. As the cylindrical cam 86 rotates further, the inclined surfaces 86a and 86b slide along the inclined surfaces 15d and 15e, causing the cylindrical cam 86 to move longitudinally toward the drive side. Finally, the cylindrical cam 86 moves until one end 86c of the cylindrical cam 86 abuts against the end face 15f of the drive side plate 15.

[0310] Here, as Figure 7 As shown in part (b), the drive transmission member 81 is rotatably and axially movable by mounting one end (fixed end 81c) of the drive side of the drive transmission member 81 in the drive transmission member bearing 83 in the axial direction. Furthermore, a gap M is provided between the longitudinal central portion 81d of the drive transmission member 81 and the drive side plate 15. Additionally, the drive transmission member 81 has an abutment surface 81e, and the cylindrical cam 86 has another end 86d facing the abutment surface 81e. The drive transmission member spring 84 is a compression spring, with one end 84a abutting against a spring seat 83a provided on the drive transmission member bearing 83, and the other end 84b abutting against a spring seat 81f provided on the drive transmission member 81. Thus, the drive transmission member 81 is axially directed toward the non-drive side ( Figure 7 (b) The left side of the part is pushed. By this push, the abutting surface 81e of the drive transmission member 81 and the other end 86d of the cylindrical cam 86 abut against each other.

[0311] As described above, the cylindrical cam 86 is directed towards the drive side in the longitudinal direction ( Figure 7As the right side of section (b) moves, the drive transmission member 81 is pushed and moved toward the drive side. This causes the drive transmission member 81 to occupy the retracted position. In other words, the drive transmission member 81 retracts from the movement path of the cartridge B, thereby securing space for allowing the cartridge B to be installed into the main assembly A of the image forming apparatus.

[0312] Next, the installation of box B will be described. For example... Figure 8 part (a) and Figure 8 As shown in part (b), the drive side plate 15 is provided with an upper guide rail portion 15g and a guide rail 15h as guides, and the non-drive side plate 16 has an upper guide rail portion 16d and a guide rail 16e. The drum bearing 73 provided on the drive side of the housing B is provided with a guided portion 73g and a rotation-stopped portion 73c. ​​Along the mounting direction of the housing B (arrow C), the guided portion 73g and the rotation-stopped portion 73c are positioned on the axis of the connecting protrusion 63b (see [reference]). Figure 1 Part (a), which will be described in detail below, is upstream of ( Figure 15 (One side of arrow AO in the image).

[0313] The installation direction of box B is approximately perpendicular to the axis of drum 62. Furthermore, when referring to upstream or downstream installation direction, upstream and downstream are defined according to the direction of movement of box B just before its installation into the main assembly A of the device is completed.

[0314] Furthermore, the cleaning frame 71 has a positioning portion 71d and a rotation stop portion 71g on its non-drive side in the longitudinal direction. When the box B is installed through the box insertion opening 17 of the main assembly A, the guided portion 73g and the rotation stop portion 73c of the box B are positioned on the upper guide rail portion 15g and guide rail 15h of the main assembly A. On the non-drive side, the positioning portion 71d and the rotation stop portion 71g of the box B are guided by the upper guide rail portion 16d and guide rail 16e of the main assembly A. In this manner, the box B is installed to the main assembly A.

[0315] Here, the developing roller gear (developing gear) 30 is located at the end of the developing roller 32 (see [reference]). Figure 9 and Figure 13 (b) That is, the developing roller gear 30 is mounted to the shaft of the developing roller 32.

[0316] The developing roller 32 and the developing roller gear 30 are coaxial with each other and surround each other. Figure 9 The axis Ax2 shown rotates. The developing roller 32 is positioned such that its axis Ax2 is approximately parallel to the axis Ax1 of the drum 62. Therefore, the axial direction of the developing roller 32 (developing roller gear 30) is approximately the same as the axial direction of the drum 62.

[0317] The developing roller gear 30 is a drive input gear (cassette-side gear, drive input member) that inputs driving force to the cassette B from the outside (i.e., the main assembly A of the device). The developing roller 32 is configured to rotate by the driving force received by the developing roller gear 30.

[0318] like Figure 1 part (a) and Figure 1 As shown in part (b), on the side surface of the drive side of cartridge B, a space 87 is provided on the drum 62 side of the developing roller gear 30, which exposes the developing roller gear 30 and the connecting protrusion 63b.

[0319] A connecting protrusion 63b is formed on the drive-side drum flange 63 attached to the end of the drum (see [reference]). Figure 9 The connecting protrusion 63b is a connecting part (drum-side connecting part, box-side connecting part, photosensitive element-side connecting part, input connecting part, drive input part) from the outside of the box B (i.e., the main assembly A of the device) to which the driving force is input (see...). Figure 9 The connecting protrusion 63b is positioned coaxially with the drum 62. In other words, the connecting protrusion 63b rotates about axis Ax1.

[0320] The drive-side drum flange 63, which has a connecting protrusion 63b, is sometimes referred to as a connecting member (drum-side connecting member, cartridge-side connecting member, photosensitive element-side connecting member, drive input connecting member, input connecting member). The drive-side drum flange 63 is sometimes simply referred to as a connector.

[0321] In addition, in the longitudinal direction of box B, the side with the connecting protrusion 63b is the driving side, and the opposite side is the non-driving side.

[0322] like Figure 9 As shown, the developing roller gear 30 includes a gear portion (input gear portion, cartridge-side gear portion, developing-side gear portion) 30a and an end face 30a1 on the drive side of the gear portion (see [reference]). Figure 1 (a) of Figure 1 Part (b) and Figure 9 The teeth (gear teeth) formed on the outer periphery of the gear portion 30a are helical teeth inclined relative to the axis of the developing roller gear 30. In other words, the developing roller gear 30 is a helical gear (see...). Figure 1 (part (a)).

[0323] The drive transmission member (drive output member, main assembly side drive member) 81 includes a gear portion (main assembly side gear portion, output gear portion) 81a for driving the developing roller gear 30. The gear portion 81a has an end face 81a1 at its non-drive side end (see...). Figure 13 part (a) and Figure 13 (part (b)).

[0324] The teeth (gear teeth) of the gear portion 81a are also helical teeth inclined relative to the axis of the drive transmission member 81. In other words, the drive transmission member 81 also has a portion of a helical gear.

[0325] The drive transmission member 81 also has a connecting recess 81b. The connecting recess 81b is a connecting portion (main component side connecting portion, output connecting portion) provided on the main component side of the device. The connecting recess 81b is a recess formed in a protrusion (cylindrical portion) provided at the free end of the drive transmission member 81 and is capable of connecting with the connecting protrusion 63b provided on the drum side.

[0326] The space 87 is configured to expose the gear portion 30a and the connecting protrusion 63b (see Figure 1 The gear portion 81a of the drive transmission member 81 is used to install the box B to the main assembly A of the device. Therefore, the space 87 is larger than the gear portion 81a of the drive transmission member 81 (see...). Figure 15 ).

[0327] More specifically, in a cross-section of box B passing through gear portion 30a and perpendicular to the axis of drum 62 (the axis of connecting protrusion 63b), an imaginary circle is drawn with its center at the axis of drum 62 (the axis of connecting protrusion 63b) and its radius being the same as the radius of gear portion 81a. Accordingly, the interior of this imaginary circle is the space in which no component of box B is arranged. The space defined by this imaginary circle is included within the aforementioned space 87. In other words, space 87 is larger than the space shown by the imaginary circle.

[0328] This will be explained in another way. In the cross-section described above, an imaginary circle is drawn concentrically (coaxially) with respect to the drum 62, where the radius is the distance from the axis of the drum 62 to the end of the tooth of the gear portion 30a of the developing roller gear 30. Accordingly, the interior of this imaginary circle is also the space in which the component of the cartridge B is not located.

[0329] By providing space 87, when box B is installed in the main component A of the device, the drive transmission component 81 will not interfere with box B. For example... Figure 15 As shown, space 87 allows box B to be installed in the main assembly A of the device by receiving drive transmission member 81 therein.

[0330] When box B is viewed along the axis of drum 62 (the axis of connecting protrusion 63b), the gear teeth of gear portion 30a are positioned close to the outer peripheral surface of drum 62.

[0331] like Figure 15As shown, the gear portion 30a is configured such that the distance AV (measured along a direction perpendicular to the axis) from the axis of the drum 62 to the end of the gear teeth (tooth end) of the gear portion 30a is within the range of more than 90% and less than 120% of the radius of the drum 62.

[0332] From the viewpoint of ensuring stable meshing between gear portion 30a and gear portion 81a to transmit driving force from gear portion 81a to developing roller 32, it is more ideal that the distance from AV is 90% to 110% of the radius of drum 62. More preferably, the distance from AV is 93% to 107% of the radius of drum 62.

[0333] Specifically, in this embodiment, the radius of the drum 62 is 12 mm, and the distance from the axis of the drum 62 to the end of the gear teeth of the gear portion 30a is set in the range of 11.165 mm or more and 12.74 mm or less. In other words, the distance from the axis of the drum 62 to the end of the gear teeth of the gear portion 30a is in the range of 93% or more and 107% of the drum radius.

[0334] In the longitudinal direction, the end face 30a1 of the gear portion 30a of the developing roller gear 30 is positioned closer to the drive side than the free end 63b1 of the connecting protrusion 63b of the drive-side drum flange 63 (see [reference]). Figure 9 and Figure 20 Here, "driving side" refers to the side further away from the non-driving side.

[0335] In other words, in the longitudinal direction, end face 30a1 is positioned further away from the non-driven side of box B than the free end 63b1. In other words, when measured along the longitudinal direction, the distance from the non-driven side of box B to end face 30a1 is longer than the distance from the non-driven side of box B to the free end 63b1.

[0336] In other words, in the longitudinal direction, end face 30a1 is located outside the free end 63b1. Here, "outside" means the side further away from the center in a certain direction. In other words, the end face 30a1 of the gear portion 30a is positioned further away from the center of the housing B in the longitudinal direction than the free end 63b1. When measured along the longitudinal direction, the distance from the center of the housing B to the end face 30a1 of the gear portion 30a is longer than the distance from the center of the housing B to the free end 63b1.

[0337] In other words, in the longitudinal direction, the free end 63b1 is located "inside" the end face 30a1. Here, "inside" means the side closer to the center in a certain direction. In other words, the free end 63b1 is closer to the center of the box B in the longitudinal direction than the end face 30a1 of the gear portion 30a. When measured along the longitudinal direction, the distance from the center of the box B to the free end 63b1 is shorter than the distance from the center of the box B to the end face 30a1 of the gear portion 30a.

[0338] As a result, in the axial direction of the developing roller gear 30, the gear teeth of the gear portion 30a are provided with exposed portions that protrude from the cartridge B (see [reference]). Figure 1 Specifically, in this embodiment, as Figure 15 As shown, the gear portion 30a is exposed within a range of 64° or more. That is, when viewing cartridge B from the drive side, if the line connecting the center of the drum 62 and the center of the developing roller gear 30 is taken as a reference line, the developing roller gear 30 is exposed within a range of at least 32 degrees on both sides of this reference line.

[0339] exist Figure 15 In the context of the developing roller gear 30, with the center (axis) of the developing roller gear 30 as the origin, the angle AW is the angle from the reference line to the position where the gear part 30a is covered by the driving side developing side member 26, and it satisfies "AW≥32°".

[0340] The total exposure angle of the gear section 30a can be expressed as 2AW, which satisfies the relationship "2AW≥64°" as described above.

[0341] If the gear portion 30a of the developing roller gear 30 is exposed from the driving-side developing member 26 in a manner that satisfies the above relationship, then the gear portion 81a is allowed to mesh with the gear portion 30a in a manner that does not interfere with the driving-side developing member 26, thereby transmitting drive.

[0342] At least a portion of the exposed portion of the gear section 30a is positioned further outward (drive side) from the box B than the free end 63b1 of the connecting protrusion 63b, and faces the axis of the drum (see...). Figure 1 , Figure 9 and Figure 20 ).

[0343] Figure 9 and Figure 21 The state of the gear teeth in the exposed portion 30a3 of the gear portion 30a facing the rotation axis Ax1 (rotation axis of the connecting protrusion 63b) of the drum 62 is shown.

[0344] exist Figure 20 In the middle, the axis Ax1 of the drum 62 is above the exposed portion 30a3 of the gear portion 30a.

[0345] exist Figure 9 In the drive transmission member 81, at least a portion of the gear portion 30a extends beyond the connecting protrusion 63b in the axial direction toward the drive side, such that the gear portion 30a overlaps with the gear portion 81a of the drive transmission member 81 in the axial direction.

[0346] Since a portion of the gear portion 30a is exposed to face the axis Ax1 of the drum 62, the gear portion 30a and the gear portion 81a of the drive transmission member 81 can come into contact with each other during the process of inserting the box B into the main assembly A of the device.

[0347] Figure 20 The image shows the outer end face 30a1 of the gear portion 30a positioned on the arrow D1 side of the free end 63b1 of the connecting protrusion 63b. Arrow D1 is an arrow pointing outward in the axial direction.

[0348] Because of the aforementioned positional relationship, the gear portion 30a of the developing roller gear 30 and the gear portion 81a of the drive transmission member 81 can mesh with each other during the process of installing the cartridge B into the main assembly A of the device.

[0349] Furthermore, in the mounting direction C of box B, the center (axis) of gear part 30a is located upstream of the center (axis) of drum 62. Figure 15 (Downstream of the direction of arrow AO in the image).

[0350] The arrangement of the developing roller gears 30 will be described in more detail. For example... Figure 16 As shown (this figure is a cross-sectional view viewed from the non-drive side), the line connecting the center of drum 62 and the center of charging roller 66 is used as the reference line (starting line) indicating the reference angle (0°). At this time, the center (axis) of the developing roller gear 30 is oriented towards the rotation direction of drum 62 relative to the aforementioned reference line. Figure 16 The downstream side (clockwise direction) is within the angular range of 64° to 190°.

[0351] More precisely, the origin is taken as the center of drum 62, the starting line is a semi-straight line extending from the center of drum 62 to the center of charging roller 66, and the direction of drum rotation is taken as the positive direction of the angle. Accordingly, the angular coordinates in the polar coordinate system indicating the center of the developing roller satisfy the following relationship: 64° angle ≤ angular coordinates of the polar coordinate system indicating the center of the developing roller ≤ 190° angle.

[0352] There is a certain degree of freedom in the arrangement of the charging roller 66 and the developing roller gear 30. The angle at which the charging roller 66 and the developing roller gear 30 are closest to each other is indicated by arrow BM, which is 64° in this embodiment, as described above. On the other hand, the angle at which they are farthest from each other is indicated by arrow BN, which is 190° in this embodiment.

[0353] As described above, the unit (developing unit 20) equipped with the developing roller gear 30 is movable relative to the unit (cleaning unit 60) equipped with the drum 62 and the connecting protrusion 63b. More specifically, the developing unit 20 is movable with a first developing support protrusion 26a and a second developing support protrusion 23b (see...). Figure 4 and Figure 5 The developing roller gear 30 rotates relative to the cleaning unit 60 as the rotation center (rotation axis). Therefore, the center distance (axial distance) between the developing roller gear 30 and the drum 62 is variable, and the developing roller gear 30 can move within a certain range relative to the axis of the drum 62 (the axis of the connecting protrusion 63b).

[0354] like Figure 9 As shown, during the insertion process of box B, when gear portion 30a and gear portion 81a come into contact with each other, gear portion 30a is pushed by gear portion 81a to move away from the axis of drum 62 (the axis of connecting protrusion 63b). This reduces the impact caused by the contact between gear portion 30a and gear portion 81a.

[0355] like Figure 10 part (a) and Figure 10 As shown in part (b), the drum bearing 73 is provided with an assembly part 73h that serves as a positioning part (axially positioned part) in the longitudinal direction (axial direction).

[0356] The drive side plate 15 of the main component A is provided with an assembly part 15j that can be assembled into the assembly part 73h. During the above-described installation process, the assembly part 73h of the box B is assembled with the assembly part 15j of the main component A, thereby determining the position of the box B in the longitudinal direction (axial direction) (see...). Figure 10 (b) of the embodiment. In this embodiment, the assembled part 73h is in the form of a slit (groove) (see [reference]). Figure 1 (b) of the slit. The slit communicates with space 87. In other words, the slit (assembled part 73h) forms a space open to space 87.

[0357] Reference Figure 20 The arrangement of the assembled part 73h will be described in detail. Figure 20 This is a diagram (schematic diagram) showing the arrangement of the assembled part 73h relative to the gear part 30a or the connecting protrusion 63b. Figure 20As shown, the slit (the part to be assembled 73h) is a space created between two parts (the outer part 73h1 and the inner part 73h2 of the part to be assembled 73h) arranged along the axial direction. In the axial direction, the inner end (inner part 73h2) of the part to be assembled 73h is located inside the end face 30a1 of the gear part 30a (arrow D2 side). In the axial direction, the outer end (outer part 73h1) of the part to be assembled 73h is located outside the free end 63b1 of the connecting protrusion 63b (arrow D1 side).

[0358] Next, the closed state of door 13 will be described. For example... Figure 8 (a) of Figure 8 (b) of Figure 11 Part (a), and Figure 11 As shown in part (b), the drive side plate 15 is provided with an upper positioning portion 15a, a lower positioning portion 15b, and a rotation stop portion 15c for positioning, and the non-drive side plate 16 includes a positioning portion 16a and a rotation stop portion 16c.

[0359] The drum bearing 73 is provided with an upper positioning part (first positioning part, first protrusion, first protrusion) 73d and a lower positioning part (second positioning part, second protrusion, second protrusion) 73f.

[0360] Box pressing members 1 and 2 are rotatably mounted to opposite axial ends of the opening / closing door 13. Box pressing springs 19 and 21 are mounted to opposite ends in the longitudinal direction of the front plate provided in the image forming apparatus A. The drum bearing 73 has a pressed portion 73e as a force receiving portion, and the cleaning frame 71 has a pressed portion 71o on the non-drive side (see...). Figure 3 By closing the opening and closing door 13, the pressed portions 73e and 71o of box B are pressed by box pressing members 1 and 2, which are pushed by box pressing springs 19 and 21 of the main assembly A of the device.

[0361] As a result, on the driving side, the upper positioned portion 73d, the lower positioned portion 73f, and the rotation-stopped portion 73c of box B contact the upper positioned portion 15a, the lower positioned portion 15b, and the rotation-stopped portion 15c of the main assembly A, respectively. Consequently, box B and drum 62 are positioned on the driving side. Furthermore, on the non-driving side, the positioned portion 71d and the rotation-stopped portion 71g of box B contact the positioned portion 16a and the rotation-stopped portion 16c of the main assembly A, respectively. Consequently, box B and drum 62 are positioned on the non-driving side.

[0362] like Figure 1 part (a) and Figure 1As shown in part (b), the upper positioning portion 73d and the lower positioning portion 73f are disposed near the drum. Furthermore, the upper positioning portion 73d and the lower positioning portion 73f are aligned along the rotation direction of the drum 62.

[0363] Additionally, in the drum bearing 73, a space (arc-shaped recess) 73l needs to be provided between the upper positioned portion 73d and the lower positioned portion 73f to accommodate the transfer roller 7 (see...). Figure 11 Therefore, the upper positioned portion 73d and the lower positioned portion 73f are set separately from each other.

[0364] Furthermore, the upper positioning portion 73d and the lower positioning portion 73f are protrusions that project inward from the drum bearing 73 along the axial direction. As described above, it is necessary to ensure a space 87 around the connecting protrusion 63b. Therefore, the upper positioning portion 73d and the lower positioning portion 73f do not project outward in the axial direction, but rather project inward to ensure the space 87.

[0365] The upper positioned portion 73d and the lower positioned portion 73f are protrusions configured to cover a portion of the drum 62. In other words, the upper and lower positioned portions 73d and 73f are protrusions that project (suspend) inward in the axial direction of the drum 62. When the upper positioned portion 73d and the drum 62 are projected onto the axis of the drum 62, the projected areas of the upper positioned portion 73d and the drum 62 at least partially overlap. In this respect, the lower positioned portion 73f is similar to the upper positioned portion 73d.

[0366] The upper positioned portion 73d and the lower positioned portion 73f are arranged to partially cover the drive-side drum flange 63 located at the end of the drum 62. When the upper positioned portion 73d and the drive-side drum flange 63 are projected onto the axis of the drum 62, the projected areas of the upper positioned portion 73d and the drive-side drum flange 63 at least partially overlap. In this respect, the lower positioned portion 73f is similar to the upper positioned portion 73d.

[0367] The pressed portions 73e and 71o are protruding portions of the frame of the cleaning unit, respectively located at one end (drive side) and the other end (non-drive side) of the housing B in the longitudinal direction. Specifically, the pressed portion 73e is mounted on the drum bearing 73. The pressed portions 73e and 71o protrude away from the drum 62 in a direction intersecting the axial direction of the drum 62.

[0368] On the other hand, such as Figure 12 part (a) and Figure 12As shown in part (b), the drive-side drum flange 63 has a connecting protrusion 63b on the drive side and a free end portion 63b1 at the free end of the connecting protrusion 63b. The drive transmission member 81 has a connecting recess 81b on the non-drive side and a free end portion 81b1 of the connecting recess 81b. By closing the opening / closing door 13, the cylindrical cam 86 moves longitudinally toward the non-drive side (the side closer to box B) via a rotatable cam link 85, while the inclined surfaces 86a, 86b rotate along the inclined surfaces 15d, 15e of the drive side plate 15. This allows the drive transmission member 81 in the retracted position to move longitudinally toward the non-drive side (the side closer to box B) via the drive transmission member spring 84. Since the gear teeth of the gear portions 81a and 30a are inclined relative to the direction of movement of the drive transmission member 81, the movement of the drive transmission member 81 causes the gear teeth of the gear portion 81a to abut against the gear teeth of the gear portion 30a. At this point, the movement of the drive transmission member 81 toward the non-drive side stops.

[0369] Even after the drive transmission member 81 stops, the cylindrical cam 86 continues to move toward the non-drive side, causing the drive transmission member 81 and the cylindrical cam 86 to separate from each other.

[0370] Next, as Figure 1 , Figure 13 part (a) and Figure 17 As shown, the drum bearing 73 has a recessed bottom surface 73i. The drive transmission member 81 has a bottom 81b2 at the bottom of the connecting recess 81b, which serves as a positioning portion. The connecting recess 81b of the drive transmission member 81 is in the form of a hole with a generally triangular cross-section. When viewed from the non-drive side (box side, the opening side of the recess 81b), the connecting recess 81b has a shape that is twisted in the counterclockwise direction N toward the drive side (the rear side of the recess 81b). The gear portion 81a of the drive transmission member 81 is in the form of a helical gear and has gear teeth that are twisted in the counterclockwise direction N toward the drive side when viewed from the non-drive side (box side). In other words, the connecting recess 81b and the gear portion 81a are inclined (twisted) toward the rear end (fixed end 81c) of the drive transmission member 81 in a direction opposite to the rotation direction CW of the drive transmission member 81.

[0371] The gear portion 81a and the connecting recess 81b are located on the axis of the drive transmission member 81, such that the axis of the gear portion 81a and the axis of the connecting recess 81b overlap. In other words, the gear portion 81a and the connecting recess 81b are arranged coaxially (concentrically).

[0372] The connecting protrusion 63b of the drive-side drum flange 63 has a generally triangular cross-section and a protruding shape (protrusion, bulge). The connecting protrusion 63b is twisted counterclockwise O from the drive side (the end side of the connecting protrusion 63b) toward the non-drive side (the bottom side of the connecting protrusion 63b) (see...). Figure 22 In other words, the connecting protrusion 63b is inclined (torsional) in the counterclockwise direction (drum rotation direction) as it extends from the outside of the box toward the inside in the axial direction.

[0373] The connecting protrusion 63b has a portion (edge) forming the corner (vertices of a triangle) of a triangular prism, which is a driving force receiving portion for actually receiving the driving force from the connecting recess 81b. This driving force receiving portion is inclined toward the direction of drum rotation as it extends axially from the outside to the inside of the box. In addition, the inner surface (inner circumferential surface) of the connecting recess 81b is a driving force applying portion for applying driving force to the connecting protrusion 63b.

[0374] The gear portion 30a of the developing roller gear 30 is a helical gear and has a shape that twists (inclines) clockwise in the direction P from the driving side toward the non-driving side (see [reference]). Figure 22 In other words, the gear teeth (helical teeth) of gear section 30a are inclined (torsional) in the axial direction of gear section 30a from the outside of the cartridge toward the inside in a clockwise direction P (the rotation direction of the developing roller and the developing roller gear). In other words, gear 30a is inclined (torsional) in the axial direction from the outside to the inside in a direction opposite to the rotation direction of drum 62.

[0375] like Figure 13 As shown, when viewed from the non-drive side (box side), the drive transmission member 81 travels clockwise CW via a motor (not shown). Figure 13 (in the opposite direction of arrow N in the diagram) rotates. Then, thrust (force generated in the axial direction) is generated by the meshing engagement of the helical teeth between the gear portion 81a of the drive transmission member 81 and the gear portion 30a of the developing roller gear 30. An axial (longitudinal) force FA is applied to the drive transmission member 81, and the drive transmission member 81 tends to move in the longitudinal direction toward the non-drive side (the side closer to the cartridge). In other words, the drive transmission member 81 approaches and contacts the connecting protrusion 63b.

[0376] Specifically, in this embodiment, the gear portion 81a of the drive transmission member 81 has helical teeth that twist in a manner that causes each tooth to move 5 to 8.7 mm in the axial direction (see...). Figure 13This corresponds to a torsion angle of 15° to 30° for gear portion 81a. The torsion angle of the developing roller gear 30 (gear portion 30a) is also 15° to 30°. In this embodiment, gear portion 81a and gear portion 30a employ a torsion angle of 20°.

[0377] When the drive transmission member 81 rotates and the triangular phases of the connecting recess 81b and the connecting protrusion 63b are matched, the connecting protrusion 63b engages with the connecting recess 81b (connection).

[0378] When the connecting protrusion 63b engages with the connecting recess 81b, both the connecting recess 81b and the connecting protrusion 63b twist (tilt) relative to the axis, generating a new thrust FC.

[0379] In other words, force FC acts on the drive transmission member 81 in the longitudinal direction toward the non-drive side (the side closer to the box). This force FC is superimposed on the previously described force FA to cause the drive transmission member 81 to move further toward the non-drive side (the side closer to the box) in the longitudinal direction. That is, the connecting protrusion 63b is used to bring the drive transmission member 81 closer to the box B.

[0380] The drive transmission member 81, attracted by the connecting protrusion 63b, is positioned in the longitudinal direction (axial direction) by abutting the recessed bottom surface 73i of the drum bearing 73 through the free end 81b1 of the drive transmission member 81.

[0381] Furthermore, the reaction force FB of force FC acts on drum 62, and this reaction force (resistance) FB causes drum 62 to move longitudinally toward the drive side (the side closer to drive transmission member 81, the outside of box B). In other words, drum 62 and connecting protrusion 63b are attracted to the drive transmission member 81 side. As a result, the free end 63b1 of connecting protrusion 63b of drum 62 abuts against the bottom 81b2 of connecting recess 81b. Therefore, drum 62 is also positioned in the axial direction (longitudinal direction).

[0382] In other words, the connecting protrusion 63b and the connecting recess 81b attract each other, thereby determining the axial position of the drum 62 and the drive transmission member 81.

[0383] In this state, the drive transmission member 81 is in the drive position. In other words, the drive transmission member 81 is in a position for transmitting driving force to the connecting protrusion 63b and the gear portion 30a.

[0384] Furthermore, the triangular centering action of the connecting recess 81b determines the center of the free end of the drive transmission member 81 relative to the drive-side drum flange 63. In other words, the drive transmission member 81 is centered relative to the drive-side drum flange 63, ensuring that the drive transmission member 81 and the photosensitive member are coaxial. Thus, the drive transmission member 81 can transmit drive to the developing roller gear 30 and the drive-side drum flange 63 with high precision.

[0385] The connecting recess 81b and the connecting protrusion 63b that engages with it can also be considered as centering portions. That is, the connecting recess 81b and the connecting protrusion 63b engage with each other so that the drive transmission member 81 and the drum are coaxial with each other. In particular, the connecting recess 81b is referred to as the main component-side centering portion (the main component-side centering portion of the image forming apparatus), and the connecting protrusion 63b is referred to as the cartridge-side centering portion.

[0386] As described above, the engagement of the connecting member is assisted by the forces FA and FC acting on the drive transmission member 81 toward the non-drive side.

[0387] In addition, the positional accuracy of the drive transmission member 81 relative to the box B can be improved by positioning the drive transmission member 81 with the drum bearing (bearing member) 73 provided on the box B.

[0388] This improves the longitudinal positional accuracy of the gear portion 30a of the developing roller gear 30 and the gear portion 81a of the drive transmission member 81, and thus enables the width of the gear portion 30a of the developing roller gear 30 to be kept small. Accordingly, the cartridge B and the main assembly A of the device for mounting the cartridge B can be miniaturized.

[0389] In summary, in this embodiment, the gear portion 81a of the drive transmission member 81 and the gear portion 30a of the developing roller gear 30 have helical teeth. Compared to spur teeth, helical teeth provide a higher gear contact ratio. As a result, the rotational accuracy of the developing roller gear 30 is improved, and the developing roller gear 30 rotates smoothly.

[0390] The helical teeth of gear portions 30a and 81a are tilted in such a direction that they generate forces (forces FA and FB) that attract each other. That is, when gear portions 30a and 81a rotate in the meshing state, a force is generated that brings the connecting recess 81b in the drive transmission member 81 and the connecting protrusion 63b at the end of the drum 62 closer together. As a result, the drive transmission member 81 moves towards the box B side, and the connecting recess 81b also moves closer to the connecting protrusion 63b. This facilitates the connection (coupling) between the connecting recess 81b and the connecting protrusion 63b.

[0391] Furthermore, the direction in which the connecting protrusion 63b (driving force receiving portion) is inclined relative to the axis of the drum and the direction in which the helical teeth of the gear portion 30a of the developing roller gear 30 are inclined relative to the axis of the gear portion 30a are opposite to each other (see [reference]). Figure 38 As a result, the movement of the drive transmission member 81 is assisted not only by the force generated by the engagement (meshing) of the gear portion 30a and the gear portion 81a, but also by the force (force FC) generated by the engagement (connection) of the connecting protrusion 63b and the connecting recess 81b. In other words, the connecting protrusion 63b and the connecting recess 81b attract each other by rotating in the connected state between the connecting protrusion 63b and the connecting recess 81b. As a result, the connecting protrusion 63b and the connecting recess 81b are stably engaged (connected).

[0392] The drive transmission member 81 is pushed towards the connecting protrusion 63b by the elastic member (drive transmission member spring 84) (see Figure 7 (a) of the embodiment. In this embodiment, the force driving the transmission member spring 84 can be transmitted via forces FA and FC (see section (a)). Figure 13 The magnitude of (b) is weakened. This reduces the frictional force between the drive transmission member spring 84 and the drive transmission member 81 generated when the drive transmission member 81 rotates, thus reducing the torque required to rotate the drive transmission member 81. The load on the motor used to rotate the drive transmission member 81 can also be reduced. In addition, the sliding noise between the drive transmission member 81 and the drive transmission member spring 84 can also be reduced.

[0393] In this embodiment, the drive transmission member 81 is pressed by an elastic member (drive transmission member spring 84), but the elastic member is not necessary. In other words, if the gear portions 81a and 30a are arranged to overlap each other at least partially in the axial direction, and the gear portions 81a and 30a mesh with each other when the housing is mounted to the main assembly of the device, then the elastic member can be eliminated. In this case, when the gear portion 81a rotates, the meshing between the gear portions 81a and 30a generates a force that attracts the connecting protrusion 63b and the connecting recess 81b to each other. That is, even without the elastic member (drive transmission member spring 84), the force generated by the meshing of the gears will bring the drive transmission member 81 closer to the housing B. Thus, the connecting recess 81b can engage with the connecting protrusion 63b.

[0394] Without the elastic member, no friction occurs between the elastic member and the drive transmission member 81, thereby further reducing the rotational torque required for the drive transmission member 81. Additionally, noise caused by slippage between the drive transmission member 81 and the elastic member can be eliminated. Furthermore, the number of components in the image forming apparatus can be reduced, thereby simplifying the structure of the image forming apparatus and lowering costs.

[0395] Furthermore, when the drive transmission member 81 is rotating, the connecting protrusion 63b of the drive-side drum flange 63 connects to the recess 81b of the drive transmission member 81. Here, the connecting protrusion 63b is inclined (torsional) in the rotational direction of the photosensitive drum as it moves from the outer side to the inner side of the housing in the axial direction of the drum 62. That is, since the connecting protrusion 63b is inclined (torsional) along the rotational direction of the drive transmission member 81, the connecting protrusion 63b can easily connect with the rotating recess 81b.

[0396] In this embodiment, such as Figure 1 part (a) and Figure 1 As shown in section (b), a structural example has been shown, wherein when the cartridge B is viewed from the drive side, the connecting protrusion 63b (drum 62) rotates counterclockwise in the direction O, and the developing roller gear 30 (developing roller 32) rotates clockwise in the direction P.

[0397] However, a structure can also be adopted in which, when viewing cartridge B from the non-drive side, the connecting protrusion 63b (drum 62) rotates counterclockwise and the developing roller gear 30 (developing roller 32) rotates clockwise. That is, by changing the layout of the main assembly A or cartridge B, the rotation directions of the connecting protrusion 63b (drum 62) and the developing roller gear 30 can be opposite to those in this embodiment. In any case, when viewed from the same direction, the connecting protrusion 63b and the developing roller gear 30 have opposite rotation directions. One rotates clockwise and the other counterclockwise.

[0398] In other words, if the cartridge B is viewed in such a way that the rotation direction of the connecting protrusion 63b is counterclockwise (in this embodiment, if the cartridge B is viewed from the drive side), the rotation direction of the developing roller gear 30 is clockwise.

[0399] In this embodiment, the developing roller gear 30 is used as a drive input gear that meshes with the drive transmission member 81, but other gears can be used as drive input gears.

[0400] In other words, a structure can be adopted in which the drive input gear (developer roller gear 30) is not connected to the developing roller 32. In such a case, the drive input gear can be configured to transmit the driving force received from the drive transmission member 81 to other members besides the developing roller 32, or it can be configured not to transmit the received driving force anywhere. In this embodiment, the cartridge has a developing roller 32, but the cartridge does not necessarily need to have a developing roller 32.

[0401] Even in such a case, if the drive input gear of the box meshes with gear 81a and receives driving force, a force is generated that pulls the drive transmission member 81 toward the connecting protrusion 63b.

[0402] Even if the drive input gear is configured not to transmit driving force to the developing roller 32, the developing roller 32 can still be rotated as long as the cartridge has a separate drive transmission path for transmitting driving force from the connecting protrusion 63b to the developing roller 32. For example, if a gear is provided on the photosensitive drum 62 and a gear is provided on the developing roller 32 that meshes with the gear of the photosensitive drum 62, the driving force received by the connecting protrusion 63b can be transmitted to the developing roller through the photosensitive drum and these gears.

[0403] However, if the developing roller gear 30 is configured to transmit the driving force to the developing roller 32 as in this embodiment, the path for transmitting the driving force from the drive transmission member 81 to the developing roller 32 is shortened, which provides the advantage of being able to more easily simplify the structure of the cartridge.

[0404] <Connector engagement conditions>

[0405] Reference Figure 1 , Figure 13 (a) of Figure 17 , Figure 18 (a) of Figure 18 (b) of Figure 19 part (a) and Figure 19 Part (b) will specify the conditions for engagement of the coupling components. Figure 18 Part (a) is a cross-sectional view of the image forming apparatus drive unit seen in the direction opposite to the mounting direction of box B, used to illustrate the distance in the drive transmission section. Figure 18 Part (b) is a cross-sectional view of the image forming apparatus drive unit as seen from the drive side, used to illustrate the distance in the drive transmission section. Figure 19 Part (a) is a cross-sectional view of the image forming apparatus drive unit as seen from the drive side, used to illustrate the gap in the connecting unit. Figure 19 Part (b) is a cross-sectional view of the image forming apparatus drive unit as seen from the drive side, used to illustrate the gap in the connecting unit.

[0406] like Figure 1 , Figure 18 part (a) and Figure 18 As shown in part (b), the drum bearing 73 has a limiting part 73j as a tilt limiting part (movement limiting part, position limiting part, stop) for limiting the movement of the drive transmission member 81 and limiting (suppressing) the tilt of the drive transmission member 81.

[0407] The drive transmission member 81 has a cylindrical portion 81i on the non-drive side (the side closer to box B) (see [reference]). Figure 18(a) portion). The cylindrical portion 81i is the cylindrical portion (protrusion) in which the connecting recess 81b is formed.

[0408] As described above, during the initial rotation phase of the drive transmission member 81, the gear portion 81a of the drive transmission member 81 and the gear portion 30a of the developing roller gear 30 engage, as... Figure 9 As shown. On the other hand, the connecting recess 81b and the connecting protrusion 63b are not connected or are not sufficiently connected. In this state, when the gear portion 81a transmits the driving force to the gear portion 30a, the meshing engagement of the gears generates an engagement force FD in the gear portion 81a. Figure 18 (part (b)).

[0409] When the engagement force FD is applied to the drive transmission member 81, the drive transmission member 81 tilts. More specifically, as described above, since the drive transmission member 81 tilts only at the fixed end 81c, which is the drive side end (see... Figure 18 The drive transmission member 81 is supported at part (a), further away from the end of box B, so the drive transmission member 81 is tilted with the drive side end 81c (fixed end) as the fulcrum. Accordingly, the end of the drive transmission member 81 on the side where the connecting recess 81b is provided (free end, free end) moves.

[0410] If the drive transmission member 81 is significantly tilted, the connecting recess 81b cannot connect with the connecting protrusion 63b. To avoid this, the box B is provided with a limiting portion 73j to suppress (limit) the tilt of the drive transmission member 81 within a certain range. In other words, when the drive transmission member 81 is tilted, the limiting portion 73j supports the drive transmission member 81, thereby preventing the tilt from becoming excessive.

[0411] The limiting portion 73j of the drum bearing 73 is an arc-shaped curved surface portion configured to face the axis of the drum 62 (the axis of the connecting protrusion 63b). The limiting portion 73j can also be considered as a protruding portion that covers the drum axis. A space is provided between the limiting portion 73j and the drum axis, in which no components of the processing box B are disposed, and the drive transmission member 81 is configured to be disposed in this space. The limiting portion 73j faces... Figure 1 The space 87 shown is restricted to the edge (outer edge) of the space 87.

[0412] The limiting part 73j is located at a position that prevents the drive transmission member 81 from moving (tilting) due to the engagement force FD.

[0413] The direction of the engagement force FD is determined by the front pressure angle α of the gear section 81a (i.e., the front pressure angle α of the developing roller gear 30). The direction of the engagement force FD is inclined at 90+α' degrees upstream towards AK in the rotational direction of the drum 62 relative to the arrow (half-straight line) LN extending from the center 62a of the drum 62 (i.e., the center of the drive transmission member 81) toward the center 30b of the developing roller gear 30.

[0414] Here, in a helical gear with a torsion angle of 20°, the standard frontal pressure angle α is 21.2°. In this embodiment, the frontal pressure angle α of gear portions 81a and 30a is also 21.2°. In this case, the inclination of the engagement force FD relative to the arrow LN is 111.2°. However, different values ​​can be used as the frontal pressure angles of gear portions 81a and 30a, and in such cases, the direction of the engagement force FD will also be different. The frontal pressure angle α also varies depending on the torsion angle of the helical gear, and the frontal pressure angle α is preferably 20.6° or more and 22.8° or less.

[0415] exist Figure 18 In part (b), when the semi-straight line FDa extends from the center 62a of the photosensitive drum and in the same direction as the bonding force FD, the limiting part 73j is configured to cross the semi-straight line FDa. The semi-straight line FDa is a line inclined (rotated) by 90+α' degrees upstream of the semi-straight line LN with the center of the drum 62 as the origin (axis, fulcrum). In this embodiment, the semi-straight line FDa is inclined at 111.2 degrees relative to the semi-straight line LN.

[0416] The limiting portion 73j does not necessarily need to be located on the line FDA, but it is preferable that the limiting portion 73j is located near the semi-linear line FDA. Specifically, it is preferable that at least a portion of the limiting portion 73j is located at a point within a range of ±15 degrees relative to the semi-linear line FDA.

[0417] The semi-straight line FFa is provided by rotating the semi-straight line LN upstream by (90+α) degrees in the rotation direction of the drum 62. Therefore, it is preferable that the limiting portion 73j is set in the range of (75+α) degrees to (105+α) degrees upstream of the semi-straight line LN in the drum rotation direction with the center of the drum 62 as the origin. Considering that the preferred value of the frontal pressure angle α is 20.6 degrees or more and 22.8 degrees or less, the preferred setting range of the limiting portion 73j is 95.6 degrees or more and 127.8 degrees or less relative to the semi-straight line LN. In this embodiment, since the frontal pressure angle α is 21.2 degrees, the preferred range of the limiting portion 73j is 96.2 degrees or more and 126.2 degrees or less.

[0418] As another preferred arrangement of the limiting portions 73j, multiple limiting portions 73j can be arranged on opposite sides of the semi-linear line FDa with the semi-linear line FDa interposed therebetween (see [reference]). Figure 26 In this case, the limiting portion 73j can also be considered as a cross-line FDa arrangement.

[0419] The limiting portion 73j is preferably arranged in the box mounting direction C relative to the center (axis) of the connecting protrusion 63b (see [reference]). Figure 11 The upstream side of AO (see part (a)) Figure 15 This is to prevent the installation of the 73j interference box B from being restricted.

[0420] The range (area) of the limiting portion 73j arranged on the drum bearing 73 can also be described as follows.

[0421] In a plane perpendicular to the axis of drum 62 (see...) Figure 18 (b) Draw a straight line LA passing through the center 62a of the drum 62 and the center 30b of the developing roller gear 30. Here, the limiting part 73j is placed on the side of the straight line LA where the charging roller is located (i.e., the side indicated by the arrow AL).

[0422] Alternatively, the limiting portion 73j is provided in region AL, which is located on the side opposite to the exposed side of drum 62 (the side of drum 62 facing the transfer roller 7) relative to the line LA passing through the center 62a and gear center 30b of drum 62. Before the cartridge B is installed in the main assembly A of the device, a cover, baffle, etc., covering drum 62 can be provided on the cartridge B, and drum 62 can be kept from exposure due to such a component. However, the exposed side of drum 62 here refers to the side of drum 62 that is exposed when such a cover, baffle, etc. is omitted.

[0423] Additionally, in a plane perpendicular to the axis of drum 62, the setting range (area AL) of the limiting part 73j can be described as follows using the circumferential direction (rotation direction) of drum 62.

[0424] Draw a semi-straight line (original line) LN extending from the center 62a of drum 62 toward the center 30b of the gear portion 30a of developing roller gear 30. Region AL is the area (region) with an angle greater than 0° and not exceeding 180° relative to the upstream side (arrow AK side) of this semi-straight line LN toward the direction of drum rotation.

[0425] This will be explained in another way. Region AL is the upstream side (arrow AK side) of the midpoint MA between the center 62a of drum 62 and the center 30b of the developing roller gear along the direction of drum rotation O. In addition, region AL is the range of the straight line (extended line) LA that does not exceed the center 62a of drum 62 and the center 30b of the gear portion 30a of developing roller gear 30.

[0426] Furthermore, when the opening / closing door 13 is opened and the drive transmission member 81 moves to the drive side, the limiting portion 73j is positioned at a location that overlaps with the gear portion 81a of the drive transmission member 81 in the longitudinal direction. That is, the limiting portion 73j also overlaps with the developing roller gear 30 in the longitudinal direction. Figure 21 As shown, when the developing roller gear 30 and the limiting portion 73j are projected onto the axis Ax2 of the developing roller gear 30, at least a portion of their projection areas overlap each other. That is, the limiting portion 73j is close to the gear portion 81a (gear portion 30a) that generates the meshing force. Therefore, when the meshing force received by the drive transmission member 81 is borne by the limiting portion 73j, bending of the drive transmission member 81 is prevented.

[0427] In addition, at least a portion of the limiting portion 73j is positioned axially on the outside of the connecting protrusion 63b. Figure 21 (One side of arrow D1 shown).

[0428] Next, the radial position of the limiting part 73j will be described with reference to drum 62 (see...). Figure 18 (part (a)).

[0429] The distances discussed below are measured in a direction perpendicular to the axial direction of drum 62 (radial distance of drum 62). The distance from the axis (center 62a) of drum 62 to the limiting portion 73j is S. The radius of the tooth tip of the gear portion 81a of the drive transmission member 81 is U. The radial distance from the center 81j of the drive transmission member 81 to the outermost radial dimension of the connecting recess is AC. The radial distance from the center 63d of the drive-side drum flange 63 to the outermost radial dimension of the connecting protrusion 63b is AD. The distance between the limiting portion 73j and the tooth tip of the gear portion 81a of the drive transmission member 81 is AA. When the inclination of the drive transmission member 81 corresponds to the clearance between it and the limiting portion 73j (when the drive transmission member 81 is inclination and the gear portion 81a contacts the limiting portion 73j), the eccentricity between the connecting protrusion 63b and the connecting recess 81b is AB (see [reference]). Figure 19 (part (b)).

[0430] Accordingly, the clearance AA between the gear portion 81a of the drive transmission member 81 and the limiting portion 73j of the drum bearing 73 is as follows: AA=SU.

[0431] In the following text, distances are measured along the axial direction of the drive transmission member 81 from the fixed end 81c, which serves as the inclined fulcrum. The axial distance from one end 81c of the drive transmission member 81 to the gear portion 81a is X. The axial distance from one end 81c of the drive transmission member 81 to the connecting recess 81b is W.

[0432] Distances X and W satisfy W > X. Therefore, when the drive transmission member 81 tilts the gap AA between the limiting part 73j and the gear part 81a, the eccentricity AB becomes longer than the gap AA and is as follows:

[0433] AB = AA × (W / X).

[0434] Furthermore, in the absence of eccentricity, the gap between the connecting protrusion 63b of the drive-side drum flange 63 and the connecting recess 81b of the drive transmission member 81 is V. Here, the gap V is the minimum value (minimum distance) of the distance between the surfaces of the two connecting parts (the distance measured along the direction perpendicular to the axis of the drum 62, i.e., the radial distance).

[0435] When the triangular phases of the connectors are aligned, the shortest gap V is as shown in the following formula:

[0436] V = AC - AD.

[0437] Even if the drive transmission member 81 is tilted by the gap AA and an eccentricity AB is generated between the couplings, it is preferable that the gap V between the couplings satisfies the following formula to facilitate the engagement of the couplings:

[0438] V = AC - AD > AB.

[0439] In other words, if the eccentricity AB is less than the shortest gap V between the connecting protrusion 63b and the connecting recess 81b, then the connecting protrusion 63b and the connecting recess 81b can tolerate the eccentricity AB, and they can engage.

[0440] If the phase of the connecting recess 81b relative to the connecting protrusion 63b changes, the shortest gap V between the two connecting parts also changes. In other words, if the phases of the two connecting parts are misaligned, the shortest gap V between the connecting protrusion 63b and the connecting recess 81b becomes less than (AC-AD). It is also possible that the gap V is less than the eccentricity AB.

[0441] However, if at least one phase relationship satisfying "V>AB" exists between the two connecting portions, then the connecting protrusion 63b and the connecting recess 81b engage with each other. This is because the connecting recess 81b contacts the connecting protrusion 63b while rotating. The connecting recess 81b can engage (connect) with the connecting protrusion 63b when it rotates to an angle satisfying "V>AB".

[0442] When measuring the distance S from the center 62a of the drum 62 to the restricting portion 73j in the radial direction of the drum 62, S = AA + U. Substituting "AB = AA×(W / X)" and "AA = S - U" into "V > AB", we get "V > (S - U)×(W / X)". It is sufficient that there is at least one phase relationship satisfying this formula between the coupling convex portion 63b and the coupling concave portion 81b.

[0443] The above formula can be further transformed to give the condition for the distance S as shown below: S < U + V×(X / W).

[0444] In addition, when the drive transmission member 81 rotates, it is desirable that the restricting portion 73j does not contact the gear portion 81a, and thus it is desirable that the restricting portion 73j is separated from the tooth ends of the gear portion 81a. This is expressed by the formula: S > U.

[0445] When summarizing it together with the above relationship, then U < S < U + V×(X / W) holds.

[0446] As in this embodiment, if the cross-sectional shapes of both the coupling convex portion 63b and the coupling concave portion 81b are approximately equilateral triangles, the clearance V is maximum when the phases of these two coupling portions are aligned. The value of V at this time can be substituted into the above formula to find the required range of S.

[0447] The operation when the coupling is engaged will be described. Before the coupling concave portion 81b of the drive transmission member 81 and the coupling convex portion 63b of the drive-side drum flange 63 are engaged with each other, an engaging force FD is applied to the drive transmission member 81. As described above, the engaging force FD is the force generated by the meshing between the gear portion 81a of the drive transmission member 81 and the gear portion 30a of the developing roller gear 30.

[0448] The engaging force FD causes the drive transmission member �1 to tilt about the drive transmission member bearing 83 as a fulcrum by the amount of clearance AA between the restricting portion 73j of the drum bearing 73 and the gear portion 81a in the direction FD of the applied meshing force. Due to this tilt, the eccentricity AB between the coupling concave portion 81b and the coupling convex portion 63b becomes smaller than the clearance V between the coupling concave portion 81b and the coupling convex portion 63b at a predetermined phase. As a result, when the drive transmission member 81 rotates and the triangular phases of the coupling concave portion 81b and the coupling convex portion 63b are aligned, the coupling concave portion 81b is assembled into the coupling convex portion 63b without interference occurring between the end faces of the coupling members and is engaged with the coupling convex portion 63b.

[0449] Here, examples of dimensions satisfying the above condition formula when the radius of the drum 62 is 12 mm are given below.

[0450] In this embodiment, the dimensions of the respective parts of the drive transmission member 81 that can be applied to the drum 62 with a radius of 12 mm are as follows. The distance AC from the center of the coupling recess 81b to the vertex of the approximately equilateral triangle of the coupling recess 81b is 6.5 mm, and the radius AE of the inscribed circle of the approximately equilateral triangle of the coupling recess 81b is 4.65 mm. The approximately equilateral triangle of the coupling recess 81b is not a pure equilateral triangle, but the vertices (angles) are rounded into an arc shape. The radius AF of the hollowed-out portion 81b3 of the coupling recess is 4.8 mm. The radius U of the addendum circle of the gear portion 81a of the coupling recess is 12.715 mm. The distance X from one end 81c to the non-driving side end face 81a1 is 30.25 mm. The distance W from one end 81c to the free end 81b1 of the coupling recess is 33.25 mm.

[0451] The shortest distance V between the coupling recess 81b and the coupling projection 63b satisfies the following relationship: 0 < V < 1.7.

[0452] The lower limit value of V occurs when the dimensions of the triangle of the coupling recess 81b are equal to the dimensions of the triangle of the coupling projection 63b, and the lower limit value of V is "0". On the other hand, the upper limit value of V occurs when the distance AC from the center of the coupling projection 63b to the vertex is 4.8 mm, and this upper limit value is the radius AF of the hollowed-out portion of the coupling recess 81b. In this case, the clearance V (mm) between the coupling projection 63b and the coupling recess 81b is calculated as "1.7 = 6.5 - 4.8".

[0453] Substituting each value and V = 1.7 into the formula "U < S < U + V × (X / W)" shown above, the result is "12.715 < S < 14.262" (unit: mm).

[0454] The above formula will be verified by using two actual examples.

[0455] First, the first example shows the dimensions when the coupling projection 63b is maximized as long as it can be engaged with the coupling recess 81b. At this time, the clearance V between the coupling projection 63b and the coupling recess 81b is minimized, so the allowable tilt of the drive transmission member 81 is small. Therefore, in order to reduce the tilt of the drive transmission member �1, it is necessary to make the restricting portion 73j as close as possible to the normal position of the gear portion 81a.

[0456] On the other hand, the second example shows the dimensions of the connecting protrusion 63b when minimized, as long as it can engage with the connecting recess 81b. In this case, the gap V between the connecting protrusion 63b and the connecting recess 81b is maximized so that the connecting protrusion 63b and the connecting recess 81b can engage with each other even if the drive transmission member 81 is tilted relatively significantly. In other words, the limiting portion 73j can tolerate a relatively large degree of tilting of the drive transmission member 81, allowing the limiting portion 73j to be relatively far from the normal position of the gear portion 81a.

[0457] The first example is an example where the size of the connecting protrusion 63b is close to its maximum value and the radial engagement amount (the area where the two components engage with each other) between the connecting protrusion 63b and the connecting recess 81b is close to its maximum value. At this time, V (the gap between the connecting parts) is close to the lower limit (minimum value), which makes S (the distance from the center of the drum 62 to the limiting part 73j) need to be close to the lower limit (12.715mm).

[0458] The distance AD ​​from the center to the vertex of the connecting protrusion 63b of the drive-side drum flange 63 is 6.498 mm. In this way, the radial engagement between the connecting parts is approximately maximized when the size of the connecting protrusion 63b is slightly smaller than the distance of 6.5 mm from the center of the connecting recess 81b to the vertex of the triangle. The radius AG of the inscribed circle in the triangle constituting the connecting protrusion 63b of the drive-side drum flange 63 is 4.648 mm. The approximate triangle of the connecting protrusion 63b is not a perfectly equilateral triangle, but rather its vertices (angles) are rounded into arcs.

[0459] In this case, the distance S from the center 62a of the drum 62 to the limiting part 73j of the drum bearing is set to 12.716 mm, which is slightly larger than the radius U of the tooth tip circle of the gear part 81a.

[0460] As a result, the clearance AA between the limiting portion 73j of the drum bearing and the gear portion 81a of the drive transmission member is 0.001 mm (=12.716-12.715). Here, when the drive transmission member 81 tilts the clearance AA between itself and the limiting portion 73j, the eccentricity AB between the connecting portions is amplified due to the difference in the longitudinal position of the limiting portion 73j and the connecting portion. The eccentricity AB is 0.0011 mm (=0.001×33.25 / 30.25). In addition, when the connecting portions are in phase, the shortest clearance V between the connecting protrusion 63b and the connecting recess 81b is 0.002 mm (the smaller of "6.5-6.498" and "4.65-4.648").

[0461] Therefore, even if the drive transmission member 81 tilts due to the meshing force, engagement is still possible because the gap V between the connecting parts is greater than the eccentricity AB between the connecting parts.

[0462] As can be understood from the above, it is preferable that the radial distance from the center of the drum 62 to the outermost part of the connecting portion is greater than 4.8 mm, and the radial distance from the center of the drum 62 to the limiting portion 73j is greater than 12.715 mm.

[0463] In the second example, as described above, the size of the connecting protrusion 63b should be as small as possible, and the radial overlap between the connecting protrusion 63b and the connecting recess 81b (the area where they engage) should be as small as possible. In this case, V (the gap between the connecting parts) is close to its maximum value (upper limit value), and S (the distance from the center of the drum 62 to the limiting portion 73j) can also take a value close to its upper limit value.

[0464] The distance AD ​​between the center and apex of the connecting protrusion 63b of the drive-side drum flange 63 is set to 4.801 mm. This is slightly larger than the radius of the hollow portion 81b3 of the connecting recess 81b, which is 4.8 mm, and is the radius at which the radial overlap between the connecting parts is almost minimized. If the distance AD ​​of the connecting protrusion 63b is shorter than the radius of the hollow portion 81b3, the free end of the protrusion 63b will not engage with the connecting recess 81b, and drive transmission will not be possible.

[0465] In this case, the radius AG of the inscribed circle of the triangle of the connecting protrusion 63b is 2.951 mm.

[0466] The distance S from the center 62a of drum 62 to the limiting part 73j of drum bearing is 14.259 mm.

[0467] As a result, the clearance AA between the limiting portion 73j of the drum bearing 73 and the gear portion 81a of the drive transmission member 81 is 1.544 mm (=14.259-12.715). Here, when the drive transmission member 81 tilts relative to the clearance amount AA of the limiting portion 73j, the eccentricity AB between the connecting portions is amplified due to the difference in the longitudinal position of the limiting portion 73j and the connecting portion, and is 1.697 mm (=1.544×33.25 / 30.25). In addition, when the connecting portions are in phase with each other, the clearance V between the connecting protrusion 63b and the connecting recess 81b is 1.699 mm (the smaller of "6.5-4.801" and "4.65-2.951"). Therefore, even if the drive transmission member 81 tilts due to the engagement force FD, the clearance V between the connecting portions is greater than the eccentricity AB between the connecting portions, so that the connecting protrusion 63b and the connecting recess 81b can engage with each other.

[0468] As can be seen from the second example, it is preferable that the radial distance from the center of the drum 62 to the outermost part of the connecting protrusion 63b is greater than 4.8 mm, and the radial distance from the center of the drum 62 to the limiting portion 73j is less than 14.262 mm.

[0469] Taking into account both the first and second examples, in this embodiment, it is preferable that the radial distance S from the center 62a of the drum 62 to the limiting portion 73j of the drum bearing is greater than 12.715 mm and less than 14.262 mm.

[0470] Next, the arrangement of the connecting protrusion 63b in the longitudinal direction (drum axial direction) will be described. For example... Figure 17 As shown, the drive-side drum flange 63 has a flange portion 63c. The cleaning frame 71 has drum limiting ribs 71m (drum limiting portion, drum longitudinal position limiting portion, and drum axial position limiting portion).

[0471] The drum limiting rib 71m is disposed on the non-driving side in the longitudinal direction relative to the flange portion 63c of the driving side drum flange 63, and faces the flange portion 63c with a gap.

[0472] If drum 62 moves beyond the gap toward the non-drive side, the flange portion 63c contacts the drum limiting rib 71m, thereby restricting the movement of drum 62. In other words, drum 62 is configured not to move beyond a certain range in the longitudinal direction (axial direction). This improves the longitudinal positioning accuracy of the connecting protrusion 63b of the drive-side drum flange 63 before the connecting protrusion 63b engages with the connecting recess 81b. Therefore, even if the longitudinal movement of the drive transmission member 81 is reduced, the connecting protrusion 63b and the connecting recess 81b can still engage with each other. By reducing the longitudinal movement of the drive transmission member 81, the main assembly A of the device can be miniaturized.

[0473] Next, the arrangement of the gear portion 30a of the developing roller gear 30 in the longitudinal direction (axial direction of the drum) will be described. Figure 17 As shown, the developing roller gear 30 has a non-driving side end face 30a2 on the non-driving side of the gear portion 30a. The developing container 23 is provided with developing roller gear limiting ribs 23d (gear limiting portion, gear longitudinal position limiting portion, gear axial position limiting portion).

[0474] The developing roller gear limiting rib 23d is disposed on the non-driving side relative to the non-driving side end face 30a2 of the gear portion 30a in the axial direction, and faces the non-driving side end face 30a2 with a gap therebetween.

[0475] As a result, the developing roller gear limiting rib 23d provided on the drive side of cartridge B restricts the longitudinal movement of the developing roller gear 30 toward the non-drive side. This improves the axial positional accuracy of the gear portion 30a of the developing roller gear 30 before it meshes with the gear portion 81a of the drive transmission member 81. Therefore, the gear width of the gear portion 30a of the developing roller gear 30 can be reduced. As a result, cartridge B and the main assembly A of the device for mounting cartridge B can be miniaturized.

[0476] <Disassembly of the box>

[0477] Next, we will refer to Figure 7 , Figure 18 and Figure 19 To describe the removal of box B from the main component A of the device.

[0478] like Figure 7 As shown, when the door 13 is rotated open, the cylindrical cam 86 rotates along the inclined surfaces 86a and 86b via the rotatable cam link 85 and moves axially toward the drive side until one end 86c of the cylindrical cam 86 abuts against the end face 15f of the drive side plate 15. Then, the cylindrical cam 86 moves, enabling the drive transmission member 81 to move axially toward the drive side (the side away from box B).

[0479] Here, as Figure 18 (a) of Figure 18 Part (b) and Figure 19 As shown in part (a), the engagement amount of the teeth in the radial direction between the gear portion 81a of the drive transmission member 81 and the gear portion 30a of the developing roller gear 30 is the engagement amount AH.

[0480] In order for gear portion 81a to disengage from gear portion 30a, gear portion 81a must move further away from gear portion 30a than the engagement amount AH between the gear portions. Therefore, the limiting portion 73j of the drum bearing 73 is arranged so as not to obstruct the movement of the drive transmission member 81 when gear portion 81a moves away from gear portion 30a. For this purpose, the direction in which gear portion 81a of the drive transmission member 81 moves away from gear portion 30a of the developing roller gear 30 is the direction indicated by arrow AI along the line connecting the center 81j of the drive transmission member 81 and the center 30b of the developing roller gear 30. Preferably, the limiting portion 73j is not provided in the direction indicated by arrow AI. That is, ideally, the limiting portion 73j is not provided in a manner that crosses the straight line LA, and the drive transmission member 81 does not contact the limiting portion 73j when gear portion 81a disengages from gear portion 30a.

[0481] Furthermore, ideally, the drive transmission member 81 should not contact the concave surface 73k of the drum bearing 73 when the gear part 81a is disengaged from the gear part 30a. Therefore, in the open state of the door 13 ( Figure 7 (a) and (b) of the drive transmission member 81 retracts to a position where it does not contact the concave surface 73k of the drum bearing 73.

[0482] In other words, such as Figure 18 As shown in part (a), the drive transmission member 81 retracts until it disengages from the connecting protrusion 63b. In this state, the free end of the drive transmission member 81 is positioned in the longitudinal direction at approximately the same position as the free end of the concave surface 73k, or further to the left relative to the free end of the concave surface 73k.

[0483] In this state, even if the drive transmission member 81 is tilted to release the meshing engagement between the gear portion 81a and the gear portion 30a, the drive transmission member 81 will not contact the concave surface 73k.

[0484] A main component A can be provided in which the drive transmission member 81 has a short movement when retracted, and the free end of the drive transmission member 81 in the retracted position is positioned to the right of the free end of the concave surface 73k. In this case, contact between the drive transmission member 81 and the concave surface 73k can be avoided if the following condition is met.

[0485] The radial distance from the center 62a of drum 62 to the concave surface 73k of drum bearing 73 is Z. The radial distance from the center 81j of drive transmission member 81 to the outer circumferential surface of the cylindrical portion 81i of drive transmission member 81 is Y. The radial distance in the gap between the concave surface 73k and the cylindrical portion 81i is AJ. In this case, the gap AJ satisfies the following formula: AJ = Z - Y AJ > AH.

[0486] In other words, a recess is provided around the drum 62. The drive transmission member 81 can move within a range where the inner circumferential surface (recessed surface 73k) of the recess does not contact the gear portion 81a.

[0487] The radial position of the concave surface 73k of the drum bearing 73 is set such that the distance Z from the center 62a of the drum 62 is as shown in the following formula: Z>AH+Y.

[0488] With the above structure, when removing cartridge B from the main assembly A of the device, the drive transmission member 81 can be tilted in the direction AD away from the developing roller gear 30 by an engagement amount AH between the gear portion 81a of the drive transmission member 81 and the gear portion 30a of the developing roller gear 30. Subsequently, the meshing engagement between the gear portion 81a of the drive transmission member 81 and the gear portion 30a of the developing roller gear 30 is brought into contact, thereby enabling smooth removal of cartridge B from the main assembly A of the device.

[0489] As described above, the thrust generated by the meshing of the helical gears causes the drive transmission member 81 to move in the direction toward the connecting portion on the box side.

[0490] Furthermore, the force generated by the meshing of the gears causes the drive transmission member 81 to move (tilt), but the amount of movement (tilt) is limited by the limiting portion provided on the box side. This ensures reliable engagement (connection) between the drive transmission member 81 and the connecting portion on the box side to achieve reliable drive transmission.

[0491] Furthermore, by providing a clearance that allows the drive transmission member 81 to move radially beyond the gear engagement height, the gear can be smoothly released from engagement when the housing B is removed from the main assembly of the device. In other words, the housing can be easily disassembled.

[0492] Unless otherwise stated, the function, material, shape, and relative arrangement of the components described in the above embodiments and various variations are not intended to limit the scope of the invention. This also applies to the embodiments described below.

[0493] <Example 2>

[0494] Next, we will refer to the following. Figures 23 to 38 Description of Embodiment 2. In particular, among the elements disclosed in this embodiment, those components corresponding to the components described in Embodiment 1 will be given the same names as the components in Embodiment 1, and only the differences from Embodiment 1 will be described.

[0495] In this embodiment, the direction along the rotation axis Ax1 of the drum 62 is the longitudinal direction D202. The longitudinal direction D202 is the direction of the rotation axis (axial direction) of the drum 62.

[0496] As in Embodiment 1, a drive-side drum flange 263 is provided in the axial direction of drum 62 (see...). Figure 24 One side of part (b) is referred to as the drive side or drive side of the box. The drive side can be considered as one end of the box in the axial direction of the drum 62.

[0497] The side of the drum 62 opposite to the driving side in the axial direction is referred to as the non-driving side or the non-driving side portion of the box. One of the driving side and the non-driving side of the box may be referred to as one side of the box, or the first side or the first side portion of the box. The other of the driving side and the non-driving side of the box may be referred to as the other side, or the second side or the second side portion.

[0498] One end of the drum 62 may be referred to as the first end or first terminal. The other end may be referred to as the second end or second terminal. For example, when the drive-side end of the drum 62 is referred to as the first end or first terminal, the non-drive-side end of the drum 62 is referred to as the second end or second terminal. The second terminal is the end of the drum 62 opposite to the first terminal. The drive-side end of the drum 62 is the part of the drum 62 provided with the drive-side drum flange 263 (see...). Figure 24 The end of part (b). In other words, drum 62 receives driving force from the drive-side end.

[0499] The direction from the non-driving side to the driving side is the direction of arrow E20, and the direction from the driving side to the non-driving side is the direction of arrow E26.

[0500] First, refer to Figure 23 and Figure 24 The box structure of this embodiment is described. Figure 23 This is a perspective view of box B. Figure 24 The illustration is for illustrative purposes only and shows the drive transmission structure of box B in this embodiment. Figure 24 Part (a) is a view taken in a direction perpendicular to the axis of rotation of drum 62, and Figure 24 Part (b) is a perspective view. The rack and pinion mechanism 290 and the drum bearing 73 are not shown. Figure 24 As shown in the image. Figure 23 As shown, similar to Embodiment 1, the cartridge B in this embodiment includes a cleaning unit 260 and a developing unit 220. The developing unit 220 includes a rack and pinion mechanism 290.

[0501] like Figure 24 As shown, the drive-side drum flange 263 has a gear portion 263e on the side closer to the drum 62 in the axial direction. The developing roller gear 230 has a gear portion 230a and is capable of rotating integrally with the support shaft 32a of the developing roller 32. The support shaft 32a of the developing roller 32 extends further toward the drive side in the longitudinal direction D202 beyond the developing roller gear 230.

[0502] The gear portion 230a of the developing roller gear 230 is positioned in a state of engagement with the gear portion 263e of the drive-side drum flange 263. That is, the driving force of the drive-side drum flange 263 is transmitted to the developing roller 32 via the developing roller gear 230. In other words, the developing roller 32 is driven by driving the drive-side drum flange 263. In this embodiment, the developing unit 220 rotates via the gear portion 263e of the drive-side drum flange 263, but drive can be transmitted to the developing unit 220 from the non-drive-side drum flange. (Refer to...) Figure 101 The structure is described in variant example 2 of embodiment 7.

[0503] <Rack and pinion mechanism>

[0504] Next, we will refer to Figure 25 Describe the structure of rack and pinion mechanism 290. Figure 25 This is an exploded perspective view of the rack and pinion mechanism 290. Figure 25 Part (a) is the view viewed from the non-driving side, and Figure 25 Part (b) is the view from the drive side.

[0505] In this embodiment, the rack and pinion mechanism 290 is disposed on the drive side of the cartridge as part of the structure of the developing unit 220 (see [link]). Figure 28 (part (b)). For example... Figure 25 As shown, the rack and pinion mechanism 290 includes a drive-side developing-side component 226, a rack and pinion 291, a tension spring 292, a locking component 293, a torsion coil spring 294, a rotatable component 295, a support component 296, a pressed component 297, and an initialization spring 298. The rack and pinion 291 may be simply referred to as a rack, depending on the situation.

[0506] Although details will be described below, rack and pinion 291 is a gear configured to engage with a helical gear outside the housing (i.e., mesh with the gear portion 81a of the drive transmission member 81). A rack and pinion mechanism 290, including rack and pinion 291, is provided on the drive side of the housing. That is, in the axial direction of the drum 62, the connecting portion (connecting protrusion 263a) and the rack and pinion mechanism 290 are located on the same side of the housing.

[0507] The various components of the rack and pinion mechanism 290 will be described.

[0508] The drive-side developing-side component 226 includes a track portion 226a, a limiting portion 226b, a sliding surface 226c, a retaining portion 226f, a hole portion 226d, a spring hook portion 226e, a spring seat surface 226h, a cut portion 226g, and a guide surface 226i, which are components associated with the rack and pinion mechanism 290.

[0509] The track portion 226a extends in the first movable direction D200, and one end of the track portion 226a is defined as end 226a1.

[0510] The limiting portion 226b is disposed in the direction opposite to the end 226a1 of the track portion 226a. The limiting portion 226b is shaped such that a portion of it protrudes beyond the track portion 226a in a direction perpendicular to the first movable direction D200.

[0511] The sliding surface 226c is a surface perpendicular to the first movable direction D200. When the direction perpendicular to both the first movable direction D200 and the longitudinal direction of the box is defined as the second movable direction D201, the sliding surface 226c extends in the second movable direction D201. The sliding surface 226c constitutes a pair of surfaces facing each other in the first movable direction D200 and is disposed between the end 226a1 of the track portion 226a and the limiting portion 226b.

[0512] A retaining portion 226f is disposed between the sliding surfaces 226c. Starting from the side closer to the track portion 226a in the second movable direction D201, the retaining portion 226f has a first hole portion 226f1 and a second hole portion 226f2 arranged sequentially. Regarding the width of the first hole portion 226f1 and the second hole portion 226f2 in the first movable direction D200, the first hole portion 226f1 is larger than the second hole portion 226f2. Furthermore, the retaining portion 226f has a pair of retaining walls 226f3 adjacent to the second hole portion 226f2 in the first movable direction D200.

[0513] The hole portion 226d is provided on the end (226a1) side that extends beyond the sliding surface 226c along the first movable direction D200.

[0514] The spring hook portion 226e is located on the downstream side in the direction of arrow E22, that is, on the side of the track portion 226a away from the hole portion 226d in the first movable direction D200.

[0515] Spring seat surface 226h is in the cassette mounting direction of the drive-side developing-side component 226 (see...). Figure 8 The surface on the downstream side of arrow C).

[0516] The cut portion 226g is provided on the non-driving side of the spring seat surface 226h in the longitudinal direction D202.

[0517] The guide surface 226i is a surface adjacent to the cutout portion 226g and extending towards the upstream side in the box mounting direction.

[0518] The rack and pinion 291 has a cuboid shape and includes a gear portion 291a, a guided groove 291b, a groove portion 291c, a spring hook portion 291d, and an abutment surface 291e. The longitudinal direction of the rack and pinion 291 is the same as the first movable direction D200. The rack and pinion 291 is a gear capable of linear movement along the first movable direction D200.

[0519] Gear portion 291a is a portion including at least one gear tooth. In this embodiment, gear portion 291a has a plurality of gear teeth. The gear teeth are arranged along a first movable direction D200 of the rack gear 291. As will be described in detail below, gear portion 291a of this embodiment is similar to gear portion 30a of Embodiment 1 (see...). Figure 9 The corresponding part. In order to mesh with the gear part 81a of the drive transmission member 81, the gear part 291a is at least partially exposed towards the outside of the housing. More specifically, the exposed portion of the gear part 291a faces the side where the axis Ax1 of the drum 62 is located (see...). Figure 23 ).

[0520] The guided groove 291b is a T-shaped groove that extends through a first movable direction D200 parallel to the arrangement direction of the gear portion 291a. The guided groove 291b is shaped such that it can only move in the first movable direction D200 via the track portion 226a of the drive-side developing-side member 226.

[0521] The groove portion 291c is a groove extending toward the gear portion 291a in the second movable direction D201. Among the surfaces defining the groove portion 291c, the surface parallel to the first movable direction D200 is the limiting surface 291c1, and among the two surfaces perpendicular to the second movable direction D201, the surface closer to the gear portion 291a is the locking surface 291c2. Furthermore, the corner portion formed on the locking surface 291c2 in the second movable direction D201 on the opposite side of the limiting surface 291c1 is the pressed portion 291c3.

[0522] The spring hook portion 291d is disposed on the side of the groove portion 291c opposite to the gear portion 291a in the first movable direction D200.

[0523] The tension spring 292 is provided with a spring hook portion 292a, which is provided at a corresponding end in the extending direction. The spring hook portions 292a are shaped such that they can be connected to the spring hook portion 226e of the drive-side developing-side member 226 and the spring hook portion 291d of the rack and pinion 291.

[0524] The locking member 293 has a flat plate shape and includes a pressing portion 293a, a restricted surface 293b, a first cylindrical portion 293c, a second cylindrical portion 293d, a gap 293e, a retaining protrusion 293f, and a guided surface 293g. The guided surface 293g constitutes a pair of opposing surfaces, and its extending direction is the same as the second movable direction D201.

[0525] As shown in the figure, the pressing portion 293a is tilted relative to one of the guided surfaces 293g.

[0526] The restricted surface 293b is a surface that extends from the pressing portion 293a toward the guided surface 293g in the first movable direction D200.

[0527] The first cylindrical portion 293c and the second cylindrical portion 293d are protrusions extending away from the rack and pinion 291 in the longitudinal direction D202. Furthermore, the first cylindrical portion 293c and the second cylindrical portion 293d are arranged sequentially along the second movable direction D201 in a direction away from the restricted surface 293b. Additionally, a gap 293e is provided between the first cylindrical portion 293c and the second cylindrical portion 293d.

[0528] The retaining protrusion 293f is a T-shaped protrusion extending along the longitudinal direction D202 in a direction opposite to that of the first cylindrical portion 293c and the second cylindrical portion 293d. The retaining protrusion 293f includes an arm portion 293f1 and a retaining portion 293f2, and the width of the arm portion 293f1 in the second movable direction D201 is smaller than the width of the retaining portion 293f2. Furthermore, in the longitudinal direction D202, the retaining portion 293f2 is positioned further away from the first cylindrical portion 293c and the second cylindrical portion 293d than the arm portion 293f1.

[0529] The torsion coil spring 294 includes an actuated arm 294a, an actuated arm 294b, and an inner diameter portion 294c. Furthermore, the state in which no load is applied to the actuated arms 294a and 294b is defined as the free state. When viewed along the longitudinal direction D202 of the actuated arms 294a and 294b, the direction in which the free ends of the actuated arms 294a and 294b approach each other from their free state is the closed direction, and the direction in which they move away from each other is the open direction. If the actuated arms 294a and 294b move continuously in the closed direction, their free ends will meet and then move away from each other; however, this situation of the free ends moving away from each other is also considered the closed direction.

[0530] The rotatable component 295 includes a first cylindrical portion 295a, a second cylindrical portion 295b, a gap 295c, a first pressed surface 295d, a second pressed surface 295e, a gap 295f, and a shaft portion 295g.

[0531] The shaft portion 295g is a cylinder extending along the longitudinal direction D202 and serves as the axis of rotation of the rotatable member 295. The axis of rotation of the rotatable member 295 is referred to as the axis of rotation Ax20.

[0532] The first cylindrical portion 295a and the second cylindrical portion 295b are protrusions extending toward the rack gear 291 in the longitudinal direction D202. When the clockwise direction around the rotation axis Ax20, observed along the direction in which the first cylindrical portion 295a and the second cylindrical portion 295b protrude, is defined as the rotation direction Q20, in the rotation direction Q20, the first cylindrical portion 295a is located downstream and the second cylindrical portion 295b is located upstream. A gap 295c is provided between the first cylindrical portion 295a and the second cylindrical portion 295b.

[0533] The first pressed surface 295d and the second pressed surface 295e are positioned radially spaced from the rotation axis Ax 20. Furthermore, in the rotation direction Q20, the first pressed surface 295d faces downstream and the second pressed surface 295e faces upstream. A gap 295f is provided between the first pressed surface 295d and the second pressed surface 295e.

[0534] The support member 296 includes a hole 296a, a developing roller support hole 296b, and a guide surface 296c, and is fixed to the drive-side developing-side member 226 during the assembly of the rack and pinion mechanism 290. In the longitudinal direction D202, the hole 296a and the guide surface 296c are located on one end side, and the developing roller support hole 296b is located on the other end side. Here, the one end side is the side where the hole portion 226d of the drive-side developing-side member 226 is located.

[0535] Hole 296a is configured to be coaxial with the hole portion 226d of the drive-side developing-side member 226 when assembling the rack and pinion mechanism 290. The assembly of the rack and pinion mechanism 290 will be described below.

[0536] The guide surface 296c is arranged to face and be parallel to the guide surface 226i of the drive-side developing-side member 226 when the rack and pinion mechanism 290 is assembled.

[0537] The pressed member 297 is L-shaped and includes a pressed surface 297a, a spring seat 297e, a guided surface 297c, a cutout portion 297d, and a cylindrical portion 297b.

[0538] The pressed surface 297a is a surface that extends in the longitudinal direction D202. In addition, the spring seat 297e is provided on the surface opposite to the pressed surface 297a.

[0539] The guided surfaces 297c form a pair of surfaces that extend vertically from the spring seat 297e, and when the rack and pinion mechanism 290 is assembled, they are arranged parallel to the guide surface 226i of the drive-side developing-side member 226 and the guide surface 296c of the support member 296.

[0540] The cut portion 297d is provided in the gap 297d1 between the guided surfaces 297c, and has an entrance portion 297d2 that is open on the side away from the pressed surface 297a.

[0541] The cylindrical portion 297b is a protrusion extending in the longitudinal direction D202.

[0542] The initial spring 298 is a compression spring (compression helical spring), but other elastic components can be used to replace this spring.

[0543] Assembly of rack and pinion mechanism

[0544] Next, we will refer to Figures 26 to 29 This describes the assembly method of the rack and pinion mechanism 290. Figure 26 and 27 This is a diagram illustrating the assembly method of the rack and pinion mechanism 290. The rack and pinion mechanism is assembled according to... Figure 26 (a) of Figure 26 Part (b) and Figure 26 Part (c) and Figure 27 (a) of Figure 27 Part (b) and Figure 27 The sequential assembly of part (c). Figure 28 This is a diagram illustrating an assembly method for assembling the rack and pinion mechanism 290 to the developing unit 220. Figure 28 Part (a) shows the state before assembly, and Figure 28 Part (b) shows the state after assembly. Figure 29 The arrangement of the rack and pinion 291 of the rack and pinion mechanism 290 is shown. Figure 29 Part (a) is a view taken in a direction perpendicular to the axis of rotation of drum 62, and Figure 29 Part (b) is a cross-sectional view taken along line X200-X200.

[0545] First, such as Figure 26As shown in part (a), the locking member 293 is assembled to the drive-side developing member 226. The locking member 293 is assembled along the longitudinal direction D202 in the direction of arrow E20 so that the retaining portion 293f2 passes through the first hole portion 226f1 of the drive-side developing member 226. After the retaining portion 293f2 has completely passed through the first hole portion 226f1, the locking member 293 moves along the second movable direction D201 in the direction of arrow E21. Then, as the arm portion 293f1 passes through the second hole portion 226f2, the movement of the locking member 293 in the longitudinal direction D202 is restricted by the retaining wall 226f3. In addition, the guided surface 293g of the locking member 293 is clamped by the sliding surface 226c, thereby restricting the movement of the locking member 293 in the first movable direction D200. As a result, the locking member 293 is supported by the drive-side developing member 226 so that it can only move in the second movable direction D201.

[0546] Next, as Figure 26 As shown in part (b), rack and pinion 291 is assembled to drive-side developing-side member 226. Rack and pinion 291 is assembled to track portion 226a along the first movable direction D200 in the direction of arrow E22, such that guided groove 291b is fitted from end 226a1 of track portion 226a. The guided groove 291b of rack and pinion 291 is supported by track portion 226a, thus restricting the movement of rack and pinion 291 in the second movable direction D201 and longitudinal direction D202. As a result, rack and pinion 291 is supported by drive-side developing-side member 226 so that it can only move in the first movable direction D200.

[0547] Next, the spring hook portion 292a of the tension spring 292 is assembled to the spring hook portion 291d of the rack gear 291 and the spring hook portion 226e of the drive-side developing-side member 226. As a result, as... Figure 26 As shown in section (c), the rack gear 291 is pushed in the direction of arrow E22 by the force F20 of the tension spring 292. The abutted surface 291e abuts against the limiting portion 226b of the drive-side developing-side member 226 by the force F20, thereby restricting the movement of the rack gear 291 in the direction of arrow E22.

[0548] Next, as Figure 27As shown in part (a), the torsion coil spring 294 and the rotatable member 295 are assembled to the drive-side developing-side member 226. First, the shaft portion 295g of the rotatable member 295 is inserted into the inner diameter portion 294c of the torsion coil spring 294 with the actuated arm 294a positioned in the gap 295c. The rotatable member 295 is assembled along the longitudinal direction D202 in the direction of arrow E20, and the shaft portion 295g is rotatably supported in the hole portion 226d. At this time, the torsion coil spring 294 is assembled such that the actuated arm 294b is positioned in the gap 293e of the locking member 293.

[0549] Next, as Figure 27 As shown in part (b), the pressing member 297 and the initialization spring 298 are assembled to the drive-side developing member 226. The pressing member 297 is inserted into the cut portion 226g along the guide surface 226i in the direction of arrow E24. At this time, the pressing member 297 is assembled such that the cylindrical portion 297b is positioned in the gap 295f of the rotatable member 295. In addition, the pressing member 297 enters the gap 297d1 from the inlet portion 297d2 through the shaft portion 295g of the rotatable member 295. The pressing member 297 is arranged such that the guide surface 297c and the guide surface 226i face each other. Thereafter, the initialization spring is compressed and disposed between the spring seat 297e of the pressing member 297 and the spring seat surface 226h of the drive-side developing member 226.

[0550] Next, as Figure 27As shown in part (c), the support member 296 is assembled to the drive-side developing member 226. The support member 296 is assembled along the longitudinal direction D202 in the direction of arrow E25, and the shaft portion 295g of the rotatable member 295 is inserted into the hole portion 296a. Additionally, the guide surface 296c is fixed to the drive-side developing member 226 by adhesive or the like, while simultaneously supporting the guided surface 297c of the pressed member 297. At this time, the shaft portion 295g of the rotatable member 295 is rotatably supported by the hole portion 226d of the drive-side developing member 226 and the hole portion 296a of the support member 296. The pressed member 297 is supported by the guide surface 226i of the drive-side developing member 226 and the guide surface 296c of the support member 296, enabling it to move in a predetermined direction, which is referred to as the third movable direction D203. The movement of the rotatable member 295, the torsion spring 294, and the pressed member 297 in the longitudinal direction D202 is limited by the driving-side developing-side member 226 and the supporting member 296. With this structure as described above, the rotatable member 295 is supported by the driving-side developing-side member 226 and the supporting member 296 to be able to rotate about the rotation axis Ax20. Similarly, the pressed member 297 is supported by the driving-side developing-side member 226 and the supporting member 296 to be able to move in the third movable direction D203.

[0551] The rack and pinion mechanism 290 is assembled through the above process.

[0552] Next, the rack and pinion mechanism 290 is installed into the developing unit 220. For example... Figure 28 As shown in part (a), the rack and pinion mechanism 290 is mounted along the longitudinal direction D202 in the direction of arrow E26, such that the support shaft 32a of the developing roller 32 is inserted into the support hole 296b of the support member 296. Thereafter, the rack and pinion mechanism 290 is fixed to the developing unit 220 using screws or the like (see...). Figure 28 (part (b)).

[0553] Finally, the developing unit 220 and cleaning unit 260, which are already equipped with the rack and pinion mechanism 290, are assembled, but since this is similar to Embodiment 1, its description will be omitted.

[0554] Here, refer to Figure 29 The scope of rack and pinion mechanism 290, specifically rack and pinion 291, will be described. Rack and pinion 291 is the same as the developing roller gear 30 of Embodiment 1 (see [link to embodiment]). Figure 9 The corresponding parts (etc.) are such that the preferred position of the rack gear 291 is similar to the preferred range of the developing roller gear 30. However, there are differences between them, which will be described in detail below.

[0555] The rack and pinion 291 is a movable component that will be described in detail below. Unless otherwise stated, the following description is based on the premise that the box is in its initial position before it is installed into the main assembly of the device, that is, the rack and pinion 291 is in a position for meshing with the drive transmission member 81.

[0556] exist Figure 29 In part (a), for better illustration, only the drum 62 and the drive-side drum flange 263 constituting the cleaning unit 260 are shown. Similarly, Figure 29 Part (b) shows only the drum 62, the developing roller 32, and the rack and pinion 291. Apart from the arrangement in this embodiment, for ease of explanation, Figure 29 The rack and pinion 291 in part (b) also shows the states of angle K20 in the positive and negative directions, which will be described below, where the positive angle is angle K20U and the negative angle is angle K20L. Figure 29 Part (b) corresponds to the view of the box seen along the axis Ax1 of the photosensitive drum. That is, Figure 29 Part (b) is a view of the cartridge as seen along the axial direction of the photosensitive drum. In other words, Figure 29 Part (b) corresponds to a view of some components of the box projected onto a plane perpendicular to the axis Ax1 of the photosensitive drum.

[0557] like Figure 29 As shown in part (a), in the longitudinal direction D202, the gear portion 291a of the rack gear 291 is located on the side in the direction of arrow E20 of the free end 263b1 of the connecting protrusion 263b of the drive-side drum flange 263. In other words, compared to the free end 263b1 of the connecting protrusion 263b of the drive-side drum flange 263, the gear portion 291a of the rack gear 291 is located on the outer side in the longitudinal direction. Furthermore, in other words, compared to the free end 263b1 of the connecting protrusion 263b of the drive-side drum flange 263, the gear portion 291a of the rack gear 291 is located on the side further away from the non-drive side of the box B.

[0558] That is, compared to the free end 263b1, the gear portion 291a is positioned further away from the non-driving side of the housing B and the non-driving side of the drum 62. In other words, the distance from the non-driving side end of the drum 62 to the gear portion 291a is longer than the distance from the non-driving side end of the drum 62 to the free end 263b1. Here, these distances are measured along a direction parallel to the axis Ax1 of the photosensitive drum.

[0559] The distance between the gear portion 291a and the free end 263b1, measured along the longitudinal direction D202, is referred to as distance L20. Distance L20 is any position of the gear portion 291a. In this case, distance L20 is in the range of 0 to 12 mm, and more preferably, in the range of 3 to 9 mm or less. In this embodiment, it is 5.5 mm. The range of distance L20 can be further increased depending on the tooth width of the gear portion 291a and the structure of the drive-side drum flange 263.

[0560] In this embodiment, the entire region of the gear portion 291a is located on the arrow E20 direction side relative to the free end 263b1, but the gear portion 291a may be partially located on the arrow E20 direction side of the free end 263b1. In other words, at least a portion of the gear portion 291a is located on the arrow E20 direction side of the free end 263b1.

[0561] like Figure 29 As shown in section (b), the direction perpendicular to the first movable direction D200 is defined as the vertical direction D207. The arrow indicating the vertical direction D207 is a straight line perpendicular to the direction of movement of the rack and pinion 291 (the first movable direction D200) and perpendicular to the straight line passing through the free ends of the individual teeth of the rack and pinion 291. The arrow also passes through the gear portion 291a of the rack and pinion 291 and extends in a direction away from the axis of rotation Ax1 of the drum 62.

[0562] like Figure 29 As shown in section (b), the distance measured along the vertical direction D207 from the rotation axis Ax1 of drum 62 to the straight line passing through the tips of multiple teeth of gear portion 291a of rack and pinion 291 is called distance L21. This distance L21 is the distance measured along the direction perpendicular to the rotation axis Ax1 from the rotation axis Ax1 of drum 62 to the straight line passing through the tips of multiple teeth of gear portion 291a.

[0563] Ideally, the distance L21 is within 90% to 120% of the radius of the drum 62, more preferably within 90% to 110%. This is because the gear portion 291a reliably meshes with the gear portion 81a of the drive transmission member 81.

[0564] In this embodiment, as in Embodiment 1, the radius of drum 62 is 12 mm, and the distance L21 is in the range of 11.165 mm to 12.84 mm. In other words, the distance L21 from the axis of drum 62 to the top of the gear teeth of gear portion 291a is in the range of 93% to 107% of the drum radius.

[0565] Furthermore, the distance from the rotation axis Ax1 of drum 62 to the tooth tip of gear portion 291a closest to the rotation axis Ax1, measured along a direction perpendicular to the rotation axis Ax1, is called L22.

[0566] Similar to the case of L21, the distance L22 is preferably in the range of 90% to 120% of the radius of drum 62, more preferably in the range of 90% to 110%. In this embodiment, it is in the range of 93% to 107%.

[0567] In order to engage with the drive transmission member 81, the gear portion 291a is at least partially exposed in a manner facing the drum axis Ax1 (see [reference]). Figure 29 part (a) and Figure 29 (b) of the above. An open space is provided between the gear part 291a and the drum axis Ax1, so that the drive transmission member 81 can be disposed between the gear part 291a and the drum axis Ax1.

[0568] Furthermore, a straight line extending from the rotation axis Ax1 of the drum 62 and passing through the rotation axis Ax2 of the developing roller 32 is used as a reference line, and the angle between this reference line and the vertical direction D207 is called angle K20. The downstream direction of the rotation of the drum 62 is the positive direction of angle K20.

[0569] In this embodiment, angle K20 is 0°, therefore, the vertical direction D207 is aligned with the baseline. For this purpose, see angles K20U and K20L.

[0570] The downstream direction of the rotation of drum 62 is the positive direction of the angle. In other words, for angle K20, the downstream side of the direction of arrow R, which is the direction of rotation of drum 62, is positive, and the upstream side of the direction of arrow R is negative. According to this definition, it is preferable that the rack and pinion 291 is configured such that angle K20 is in the range of -75° to 50°.

[0571] The lower limit of K20 is selected from the viewpoint of more reliably engaging the drive transmission member 81 and the rack and pinion 291 with each other, and from the viewpoint of avoiding interference between the rack and pinion 291 and the surrounding box structure and the main component A of the image forming apparatus. Therefore, it is more preferable that the angle K20 is -50° or more, and even more preferable that the angle K20 is -35° or more.

[0572] Furthermore, regarding the upper limit of K20, it is more preferable that the angle K20 is 45° or less, and even more preferable that the angle K20 is 30° or less. This choice is made from the viewpoint of ensuring more reliable meshing between the drive transmission member 81 and the rack and pinion 291, and preventing interference between the rack and pinion 291 and the surrounding box structure and the main component A of the image forming apparatus.

[0573] Preferably, the upper and lower limits of the above angles are selected according to the structure of the main component A of the device and the box.

[0574] In this way, a preferred range of angle K20 is appropriately selected based on the structure of the main component A of the image forming apparatus to which this embodiment is applied, and this will be described below.

[0575] As described above, the straight line connecting the rotation axis Ax1 of the drum 62 and the rotation axis Ax2 of the developing roller 32 is used as a reference line. The angle formed by the straight line extending from the rotation axis Ax1 of the drum 62 and passing through the teeth of the gear portion 291a of the rack gear 291 with respect to this reference line is angle K21 (see [reference]). Figure 29 ).

[0576] Angle K21 is positive downstream of arrow R, which represents the rotation direction of drum 62, and negative upstream of arrow R. Preferably, rack and pinion 291 is configured such that angle K21 is greater than -75° and less than 50°. This is the gear portion 81a of the drive transmission member 81 (see...). Figure 13 Preferred conditions for meshing between the gear portion 291a of the rack and pinion 291 and the gear portion 291a of the rack and pinion 291.

[0577] Regarding the lower limit of K21, from the viewpoint of more reliable engagement between the drive transmission member 81 and the rack and pinion 291, it is more preferable that the angle K21 is not less than -50°, and even more preferably that the angle is not less than -35°.

[0578] Regarding the upper limit of K21, it is more preferable that the angle K21 is not greater than 45°, and even more preferably that the angle is not greater than 30°. This choice is made from the viewpoint of more reliable engagement between the drive transmission member 81 and the rack and pinion 291, and from the viewpoint of preventing interference between the rack and pinion 291 and the surrounding box structure and the main components of the device.

[0579] Based on the structure of the main component A and the box, it is preferable to select an appropriate combination of the upper and lower limits of the aforementioned angle. In this embodiment, K21 is set to be not less than -35° and not greater than 45°.

[0580] Preferably, the angle K21 of at least one tooth of the gear portion 291a of the rack gear 291 is arranged within the aforementioned preferred range. However, it is further preferred that the angle K21 between the reference line and the line from the rotation axis Ax1 toward the nearest tooth tip of the rack gear is within the aforementioned preferred range.

[0581] In this embodiment, the rack and pinion mechanism 290 is disposed in the developing unit 220, but it can be disposed in the cleaning unit 260, depending on the settings of angle K20, angle K21, distance L20 and distance L21.

[0582] Operation of rack and pinion mechanism

[0583] Next, we will refer to Figure 30 Explain the operation of the rack and pinion mechanism 290.

[0584] Figure 30 This is an operational diagram of the rack and pinion mechanism 290, where parts (a) and (c) are along... Figure 29 The cross-sectional view taken by line X201-X201 in part (a), and Figure 29 Part (b) and Figure 29 Part (d) is a cross-sectional view taken along line X 202-X202. Figure 30 Parts (a) and (c) show the rack and pinion mechanism 290 in a standby state (non-operating state), and parts (b) and (d) show the rack and pinion mechanism 290 in an operating state. For better understanding, some components are shown by shading.

[0585] First, refer to Figure 30 part (a) and Figure 30 Part (c) describes the standby state (non-operation state) of the rack and pinion mechanism 290. For example... Figure 30 As shown in part (a), the pressing force F21 of the initial spring 298 pushes the pressed member 297 in the direction of arrow E25 along the third movable direction D203 to position the pressed member 297 in a first position displaced in the direction of arrow E25. Additionally, the cylindrical portion 297b abuts against the first pressed surface 295d of the rotatable member 295 to apply a force F22 to the first pressed surface 295d. Due to the force F22, a torque M21 is generated in the rotatable member 295 to push the rotatable member 295 in the rotational direction Q21 about the rotation axis Ax20.

[0586] like Figure 30As shown in section (c), the first cylindrical portion 295a of the rotatable member 295 is pushed in the rotational direction Q21 about the rotation axis Ax20. The actuated arm 294a of the torsion spring 294 abuts against the first cylindrical portion 295a of the rotatable member 295 and receives a force F23. By receiving this force F23, a torque M23 is generated by the torsion spring 294 about the rotation axis Ax1. This torque M23 pushes the torsion spring 294 in the rotational direction Q23 about the rotation axis Ax21. Furthermore, the actuated arm 294b of the torsion spring 294 abuts against the second cylindrical portion 293d of the locking member 293, applying a force F24 to the second cylindrical portion 293d. The actuated arm 294b abuts against the second cylindrical portion 293d of the locking member 293.

[0587] Through this structure, the locking member 293 is pushed in the direction of arrow E21. Here, the angle between the driven arm 294a and the actuating arm 294b of the torsion coil spring 294 is set at a position slightly offset from the free position along the opening direction. Then, the driven arm 294a and the actuating arm 294b of the torsion coil spring 294 tend to return to their closed state. The force F24 toward the locking member 293 is maintained. This state is referred to as the standby state of the rack and pinion mechanism 290. Although details will be described below, the standby state is the non-operating state in which the locking member 293 of the rack and pinion mechanism 290 is not operated.

[0588] Next, we will refer to Figure 30 Part (b) and Figure 30 Section (d) describes the operating state of the rack and pinion mechanism 290. When the housing B is installed in the main assembly A of the image forming apparatus, the pressed surface 297a of the pressed member 297 contacts a portion of the main assembly A of the image forming apparatus and is pressed in the direction of arrow E24. In this embodiment, a portion of the main assembly A of the image forming apparatus is the abutment portion 15m of the drive side plate 15 (see...). Figure 31 (a) of the portion. When the pressed member 297 moves in the direction of arrow 24, the second pressed surface 295e of the rotatable member 295 is pressed against the cylindrical portion 297b, causing the rotatable member 295 to rotate in the rotation direction Q20 about the rotation axis Ax20 (see part (a)). Figure 30 Part (b) and Figure 30 (d) part).

[0589] In this state, the pressed member 297 is pushed along the third movable direction D203 in the direction of arrow E24 by an external force F25, and moves to the second position in the direction of arrow E24. Additionally, the cylindrical portion 297b of the pressed member 297 contacts the second pressed surface 295e of the rotatable member 295 to apply a force F26 to the second pressed surface 295e of the rotatable member 295.

[0590] Force F26 generates torque M22 in rotatable member 295, and rotatable member 295 rotates in the rotation direction Q20 about the rotation axis Ax20. Figure 30 As shown in section (d), by rotating the rotatable member 295 in the rotational direction Q20, the second cylindrical portion 295b contacts the actuated arm 294a of the torsion coil spring 294 to apply a force F200. The torsion coil spring 294 is spring-loaded by the force F200, and a torque M24 is generated, causing the torsion coil spring 294 to be pushed in the rotational direction Q24 about the rotation axis Ax22 (which is the rotation axis of the torsion coil spring 294 at this time).

[0591] The actuating arm 294b of the torsion coil spring 294 contacts the first cylindrical portion 293c of the locking member 293 to apply a force F27 to the first cylindrical portion 293c. The force F27 pushes the locking member 293 in the direction of arrow E27, and the restrained surface 293b abuts against the rack and pinion 291. At this time, the angle between the actuated arm 294a and the actuating arm 294b of the torsion coil spring 294 is smaller than the angle in the free state. In other words, the actuated arm 294a and the actuating arm 294b of the torsion coil spring 294 tend to return to their original opening direction.

[0592] As a result, the torsion coil spring 294 maintains the actuating arm 294b in a state where the force F27 pushes the locking member 293 along the second movable direction D201 in the direction of arrow E27. This state is referred to as the operating state of the rack and pinion mechanism 290.

[0593] Although details will be described below, the operating state is the state in which the locking member 293 is operable. In other words, when the rack and pinion mechanism 290 is in the operating state, after the rack and pinion 291 moves, the rack and pinion 291 is locked by the locking member 293 and does not return to its original position.

[0594] When cartridge B is removed from the main assembly A of the image forming apparatus in this state, the pressed member 297 moves in the direction of arrow E25 by the pushing force F21 of the initialization spring 298, as shown. Figure 30 part (a) and Figure 30As shown in section (c), the first pressed surface 295d of the rotatable member 295 is pressed by the cylindrical portion 297b, causing the rotatable member 295 to rotate in the rotational direction Q21 about the rotation axis Ax20. In other words, the rack and pinion mechanism 290 returns to... Figure 30 The standby state (non-operation state) shown in part (a).

[0595] As will be described in detail below, the standby state is the state in which the locking member 293 is not operated. In other words, when the rack and pinion mechanism 290 returns to the standby state, the rack and pinion 291 is no longer locked by the locking member 293, and therefore the rack and pinion 291 can return to its original position.

[0596] The locking member 293 can be simply referred to as the locking element, and the pressed member 297 can be referred to as the operating part. The pressed member 297 is operated by mounting the cartridge to or removing the cartridge from the main assembly A of the image forming apparatus.

[0597] <Structure of the main assembly of the image forming apparatus>

[0598] Next, we will refer to Figure 31 and Figure 32 The structure of the main component A of the image forming apparatus in this embodiment is described.

[0599] Figure 31 This is a diagram illustrating the structure of the main component A of the image forming apparatus. Part (a) of the diagram is an exploded perspective view of the drive side, and part (b) is a view seen along a direction perpendicular to the longitudinal direction.

[0600] Figure 32 This is a diagram showing the structure of the main component A of the image forming apparatus. Figure 32 Part (a) is along Figure 31 The cross-sectional view taken by line X204-X204 in part (b). Figure 32 Part (b) is along Figure 32 The cross-sectional view taken by line X205-X205 in part (a), and Figure 32 Part (c) is shown Figure 32 An enlarged view of the DT20 region in section (a). Compared to Embodiment 1, the main component A of the image forming apparatus in this embodiment and the following embodiments is shown in more detail. Components corresponding to the components described in Embodiment 1 are given the same names as in Embodiment 1.

[0601] like Figure 31As shown in part (a), the main component A of the image forming apparatus in this embodiment includes a cylindrical cam 86, a drive transmission member 81, and a drive-side outer frame 50 arranged sequentially from the drive side plate 15 along the direction of the arrow DW4 indicating the longitudinal drive direction. Additionally, a drive transmission member bearing 83, which is provided with a drive transmission member spring 84, is attached to the drive-side outer frame 50.

[0602] The drive side plate 15 is provided with a hole portion 15n through which the gear portion 81a of the drive transmission member 81 passes, and includes an abutting portion 15m for abutting against the pressed member 297 of the rack and pinion mechanism 290 described above.

[0603] The drive transmission member 81 includes a second gear portion 81k for receiving drive force from a drive source (not shown) of the main component A of the image forming apparatus. A cylindrical portion 81m is connected between the gear portion 81a and the second gear portion 81k. The diameter of the cylindrical portion 81m is slightly larger than the addendum circle of the gear portion 81a, and it slides in the hole portion 15n of the drive side plate 15.

[0604] The drive-side outer frame 50 is provided with a protrusion 50a that protrudes inward in the longitudinal direction.

[0605] Here, the drive transmission member 81 is configured to tilt in a predetermined tilting direction DW1. This will be described below.

[0606] like Figure 32 As shown in part (a), the protrusion 50a of the drive-side outer frame 50 is provided on the upstream side of the gravity direction DZ1 from the vertical direction DZ, surrounding the drive transmission member bearing 83 (see [reference]). Figure 7 The center of part (b) is rotated clockwise by an angle K21 to a position. The protrusion 50a is connected to the drive transmission component bearing 83 (see...). Figure 7 The line at the center of part (b) is defined as direction D205, and the direction from protrusion 50a toward the center of drive transmission member bearing 83 is defined as tilt direction DW1.

[0607] like Figure 32 As shown in part (b), the fixed end 81c of the drive transmission member 81 is cantilevered by the drive transmission member bearing 83. As described in Embodiment 1, when the opening / closing door 13 is opened, the cylindrical cam 86 moves longitudinally toward the drive side (see [reference]). Figure 7Here, the rib extending longitudinally toward the non-driving side on the wall surface connecting the second gear portion 81k and the cylindrical portion 81m is the abutment rib 81k2, and the end face of the second gear portion 81k on the driving side in the longitudinal direction is the abutment surface 81k1. The drive transmission member 81 abuts against the cylindrical cam 86 at the abutment rib 81k2 and against the protrusion 50a at the abutment surface 81k1. At this time, the connecting free end 81b1 side of the drive transmission member 81 is inclined in the inclined direction DW1 with the fixed end 81c as the fulcrum.

[0608] The drive transmission member 81 has clearance between the cylindrical cam 86 and the protrusion 50a, and the inclination of the drive transmission member 81 in the tilting direction DW1 is determined by the gear portion 81a abutting against the hole portion 15n of the drive side plate 15. Here, as Figure 32 As shown in section (c), parallel to direction D205 and passing through drive transmission member bearing 83 (see...). Figure 7 The straight line at the center of part (b) is defined as the straight line SL1. The hole portion 15n of the drive side plate 15 has a pair of gear support surfaces 15n1 on the inclined direction DW1 side, which are symmetrical about the straight line SL1. The position of the drive transmission member 81 in the inclined direction DW1 is determined by the gear portion 81a abutting against this pair of gear support surfaces 15n1.

[0609] In addition, the drive transmission member 81 is supported as a cantilever with the fixed end 81c as the fulcrum, and therefore, the free end of the connector 81b1 also tilts in the tilt direction DW1 due to the tilt caused by gravity.

[0610] Furthermore, the position of the gear portion 81a of the drive transmission member 81 in the direction D206 perpendicular to the direction D205 is not restricted, and it tilts in the direction D206 when an external force is applied to the gear portion 81a, etc.

[0611] <Install the box to the main assembly of the image forming apparatus>

[0612] Next, we will refer to Figure 33 The operation of mounting cartridge B to the main component A of the image forming apparatus is described in this embodiment. Figure 33 It is along Figure 29 The section in part (a) shows a cross-sectional view of the installation operation of the cartridge B to the main assembly A of the image forming apparatus, cut by line X202-X202. Furthermore, part (a) of the figure shows the state before the cartridge is installed, while part (b) shows the state after the cartridge is installed.

[0613] like Figure 33As shown in part (a), before the housing B is installed into the main assembly A of the image forming apparatus, the pressed surface 297a of the pressed member 297 faces the abutment portion 15m of the drive side plate 15, which is part of the main assembly A of the image forming apparatus. At this time, the rack and pinion mechanism 290 is in a standby state. Furthermore, the gear portion 291a of the rack and pinion 291 is about to mesh with the gear portion 81a of the drive transmission member 81. When the housing B moves from this position along the installation direction C, it reaches the state after the housing B is installed, as shown in part (a). Figure 33 As shown in part (b).

[0614] At this time, the position of the rack and pinion 291 relative to other components of the housing will be referred to as the initial position, engaged position, operating position, or pre-movement position. The rack and pinion 291 is pushed to the initial position by the tension spring 292.

[0615] Here, the movement of the rack and pinion 291 along the first movable direction D200 in the direction of arrow E22 is restricted. Therefore, during the installation process of box B, the gear portion 81a of the drive transmission member 81 and the gear portion 291a of the rack and pinion 291 interfere with each other. However, as described above, the gear portion 81a of the drive transmission member 81 can be tilted in the direction D206 perpendicular to the direction D205 by an external force. Therefore, if the component of the direction D206 towards the downstream side of the installation direction C is defined as the avoidance direction DW2, then when the gear portion 291a of the rack and pinion 291 contacts the gear portion 81a of the drive transmission member 81, the gear portion 81a tilts in the avoidance direction DW2. This prevents interference between the gear portion 291a and the gear portion 81a of the rack and pinion 291. Subsequently, the gear portion 291a of the rack and pinion 291 moves to the meshing position relative to the gear portion 81a of the drive transmission member 81, and the gear portion 81a of the drive transmission member 81 meshes with the gear portion 291a due to its own weight.

[0616] Then, when cartridge B is installed in the main assembly A of the image forming apparatus, the pressed member 297 is pressed by the abutment portion 15m of the drive side plate 15 to move to the second position. This changes the rack and pinion mechanism 290 into the operating state.

[0617] <Engagement operation of drive transmission component 81>

[0618] Next, we will refer to Figures 34 to 36 The operation is described from the time the drive transmission member 81 is driven until the connecting recess 81b engages with the connecting protrusion 263b of the drive-side drum flange 263. Figure 34 It is along Figure 29 The section shown in part (a) is a cross-sectional view of the operation when the drive transmission member 81 is driven, with line X202-X202 intersecting. Figure 34 Part (a) shows the drive with the drive transmission member 81 tilted, and part (b) shows the state immediately following the alignment of the drive transmission member 81 with the rotation axis Ax1 of the drum 62. Figure 35 It is along Figure 34 The section shown in part (a) is a cross-sectional view of the engagement operation of the drive transmission member 81, taken by line X203-X203. Figure 35 Part (a) shows the tilted state of the drive transmission member 81. Figure 35 Part (b) is the state in which the drive transmission member 81 is aligned with the rotation axis Ax1 of the drum 62, and part (c) is the state in which the connecting recess 81b is engaged with the connecting protrusion 263b of the drive-side drum flange 263. Figure 36 It is along Figure 29 The section cut by line X202-X202 in part (a) shows a cross-sectional view of the operation of the rack and pinion mechanism 290 after the drive transmission member 81 is aligned with the rotation axis Ax1 of the drum 62. Figure 36 Part (a) illustrates the process by which the movement of the rack and pinion 291 is restricted by the locking member 293, and Figure 36 Part (b) shows the state where movement is restricted.

[0619] like Figure 34 As shown in part (a), when the drive transmission member 81 rotates in the rotational direction CW, as in Embodiment 1, an engagement reaction force FD20, which is a reaction force as engagement force FD1, is generated in the gear part 81a through gear meshing. During this stage, the helical gear part 81a moves in the direction of engagement reaction force FD20; therefore, not much force is transmitted to the gear part 291a, and the engagement force FD1 is small. Thus, the engagement force FD1 is less than the force F20 acting on the rack gear 291 by the tension spring 292, and the rack gear 291 does not move due to the engagement force FD1. The rack gear 291 remains in its initial position.

[0620] In this embodiment, the tension spring 292 is used as an elastic member to push the rack gear 291 toward its initial position, but this is not mandatory. For example, the rack gear 291 can be pushed by springs of different types.

[0621] The rack and pinion 291 remains in its initial position, but on the other hand, the gear portion 81a of the drive transmission member 81 moves by the engagement force FD1. If the axis of the drive transmission member 81 is the axis of rotation Ax3 (see...), Figure 35 (a) then the movement of gear part 81a causes the rotation axis Ax3 to move in the same direction as the rotation axis Ax1 of drum 62. Then, as Figure 34As shown in part (b), the gear part 81a contacts the limiting part 73j, and the rotation axis Ax3 of the drive transmission member 81 and the rotation axis Ax1 of the drum 62 become substantially coaxial with each other.

[0622] As in Embodiment 1, thrust FA is generated by the meshing of the helical teeth of gear portion 81a and gear portion 291a. Figure 35 As shown in part (b), a thrust FA in the axial direction (longitudinal direction) is applied to the drive transmission member 81 to move it longitudinally toward the non-drive side (the side closer to the housing). That is, the drive transmission member 81 approaches and contacts the connecting protrusion 63b. When the drive transmission member 81 rotates such that the triangular phases of the connecting recess 81b and the connecting protrusion 63b are matched, the connecting protrusion 63b enters the connecting recess 81b, as... Figure 36 As shown in section (c), as in embodiment 1, when the surfaces constituting the connecting protrusion 263b and the connecting recess 81b come into contact with each other and transmit drive, a new thrust FC is generated because both of them twist (tilt) relative to the axis.

[0623] When the gear portion 81a of the drive transmission member 81 contacts the limiting portion 73j, or when the connecting recess 81b engages with the connecting protrusion 63b, the movement of the gear portion 81a in directions other than the rotational direction is restricted. When the movement of the drive transmission member 81 is restricted, force can be sufficiently transmitted from the gear portion 81a to the gear portion 291a of the rack and pinion 291. Therefore, as Figure 34 As shown in part (b), the engagement force FD2 becomes greater than the force F20 that pushes the rack and pinion 291 by the tension spring 292, where FD2 is the meshing force received by the gear portion 291a due to the meshing force between the gears at this time. Therefore, the rack and pinion 291 moves from its initial position along the first movable direction D200 in the direction of arrow E28 by the engagement force FD2.

[0624] When the rack and pinion 291 moves a certain amount in the direction of arrow E28, the pressed part 291c3 abuts against the pressing part 293a of the locking member 293, as shown. Figure 36 As shown in part (a), the locking member 293 is pressed in the direction of arrow E27 along the second movable direction D201 by a force F27 from the torsion spring 294. Therefore, the pressed portion 291c3 of the rack and pinion 291 receives a force F28a from the pressing portion 293a of the locking member 293. The force F28a1, which is the first movable direction D200 component of the force F28a, is selected to be greater than the force F20a from the tension spring 292. Therefore, the rack and pinion 291 moves in the direction of arrow E28, and the locking member 293 further moves in the direction of arrow E27.

[0625] When rack and pinion 291 moves in the direction of arrow E28, as Figure 36 As shown in part (b), gear portion 291a disengages from gear portion 81a of drive transmission member 81. In this state, locking member 293 is pushed in the direction of arrow E27 along the second movable direction D201 by force F27a from torsion coil spring 294. As a result, the pressed portion 291c3 of rack and pinion 291 receives force F28b from the pressing portion 293a of locking member 293. If this force is defined as force F28b1, then force F28b1, as the first movable direction D200 component of force F28b, is selected to be greater than force F20b from tension spring 292. By doing so, the movement of rack and pinion 291 in the direction of arrow E22 is restricted by locking member 293. Furthermore, locking member 293 from Figure 36 The unlock position shown in part (a) is moved to... Figure 36 The locked position shown in part (b) is maintained.

[0626] As a result, the gear portion 291a remains in a state where it is not engaged with the gear portion 81a of the drive transmission member 81. The position of the rack and pinion 291 in the housing at this time is referred to as the retracted position, the non-engaged position, the moved position, etc.

[0627] In this manner, rack and pinion 291 moves from its initial position to its retracted position by engaging with the gear portion 81a of the drive transmission member 81 and receiving the driving force from the gear portion 81a. When rack and pinion 291 is in the retracted position, rack and pinion 291 is prevented from moving and locked by the locking member 293 in the locked position, and rack and pinion 291 remains in the retracted position.

[0628] Initial position of rack and pinion 291 (see Figure 36 (a) and retraction position (see part (a)) and retraction position (see part (a)) Figure 36 One of the positions of the rack and pinion 291 in part (b) may be referred to as the first position, and the other as the second position. The rack and pinion 291 is a movable member capable of moving between the first and second positions. When the rack and pinion 291 moves, the teeth of the rack and pinion 291 also move between the first and second positions.

[0629] Similarly, the locking position of locking member 293 (see...) Figure 36 (a) and unlock location (see Part (a)) and unlock location (see Part (a)) Figure 36One of the positions of the locking member 293 in part (b) may be referred to as the first position of the locking member 293, and the other may be referred to as the second position of the locking member 293. The locking member 293 is also a movable member capable of moving between the first position and the second position.

[0630] The locking member 293, which holds the rack and pinion 291 in the retracted position, is not essential, but it is preferred. To illustrate why, the following hypothetical scenario will be described where the box does not have the locking member 293 and the movement of the rack and pinion 291 is not restricted by the locking member 293.

[0631] In this case, when the rack and pinion 291 moves to the retracted position by receiving the driving force from the drive transmission member 81, once the engagement with the drive transmission member is released, it moves in the direction of arrow E22 by the force F20b of the tension spring 292 and tends to return to the initial position.

[0632] Therefore, the gear portion 291a of the rack and pinion 291 also moves in the direction of arrow E22 and collides with the gear portion 81a of the drive transmission member 81, and then the gear portions 291a and 81a re-engage with each other. Furthermore, the drive transmission member 81 rotates in the rotational direction CW, and the gear portion 81a causes the gear portion 291a of the rack and pinion 291 to move again toward the retracted position in the direction of arrow E28. Thereafter, the rack and pinion 291 reaches the retracted position, and the meshing between the gear portion 291a of the rack and pinion 291 and the gear portion 81a of the drive transmission member 81 is released. Then, the gear portion 291a moves again toward the initial position in the direction of arrow E22, and the gear portion 291a collides with the gear portion 81a of the drive transmission member 81.

[0633] As described above, the reciprocating motion of the rack and pinion 291 repeats with the gear meshing cycle, which can lead to abnormal noise or a decrease in the rotational accuracy of the drive transmission member 81. On the other hand, in the case where the housing in this embodiment has a locking member 293, as described above, the locking member 293 maintains the rack and pinion 291 in a state where the gear portion 291a is disengaged from the gear portion 81a of the drive transmission member 81. Therefore, the aforementioned problems can be avoided.

[0634] <Disassembly Box>

[0635] Next, we will refer to Figure 37 This describes the disassembly operation of disassembly box B from the main component A of the image forming apparatus. Figure 37 It is along Figure 29 The section shown in part (a) is a cross-sectional view of the disassembly operation of box B, taken by line X202-X202. Figure 29 Part (a) to Figure 29Section (d) illustrates the disassembly process.

[0636] like Figure 37 As shown in part (a), in order to disassemble box B, box B is moved in the opposite direction to the installation direction C. At this time, the pressed surface 297a of the pressed member 297 separates from the abutting portion 15m of the drive side plate 15, so that the pressed member 297 moves to the first position by the force F22 of the initialization spring 298.

[0637] like Figure 37 As shown in part (b), the first pressed surface 295d of the rotatable member 295 presses against the cylindrical portion 297b, causing the rotatable member 295 to rotate in the rotational direction Q21 about the rotation axis Ax20 (see [reference]). Figure 30 At this point, the angle between the driven arm 294a and the actuating arm 294b of the torsion spring 294 becomes further open (less than 20°) compared to the free state, causing the torsion spring 294 to attempt to return to the closed direction. Because the driven arm 294a of the torsion spring 294 is supported by the first cylindrical portion 295a of the rotatable member 295, a restoring force F29 is generated in the actuating arm 294b. The locking member 293 receives the force F29 through the second cylindrical portion 293d and moves in the direction of arrow E21.

[0638] like Figure 37 As shown in section (c), when the locking member 293 moves in the direction of arrow E21, the pressing portion 293a disengages from the pressed portion 291c3 of the rack and pinion 291. That is, the locking member 293 moves from the locked position (see [reference]). Figure 37 (a) of the part is moved to the unlock position (see part (a)). Figure 37 In part (c), the locking of the rack and pinion 291, achieved by the locking member 293, is released. The rack and pinion 291 is pulled from its retracted position by the force F20a applied by the tension spring 292 (see section (c)). Figure 37 (a) moves along the direction of arrow E22 to the initial position (see part (a)). Figure 37 (d) part).

[0639] Then, as Figure 37 As shown in part (d), the rack and pinion mechanism 290 is in standby mode.

[0640] Through the above process, box B is removed from the main component A of the image forming apparatus.

[0641] As described above, when the pressed member 297 is pressed by the drive side plate 15, the rack and pinion mechanism 290 is in an operating state, and the locking member 293, which is in the locked position, locks the rack and pinion 291 in a standby position. On the other hand, when the pressed member 297 is not pressed by the drive side plate 15, the rack and pinion mechanism 290 is in a standby state. In other words, the locking member 293 moves from the locked position to the unlocked position, and therefore, the rack and pinion 291 is allowed to reach its initial position.

[0642] In other words, the pressed member 297 is the operating part, which is operated to switch between an operating state in which the locking member 293 can lock the rack and pinion 291 and a standby state in which the locking member 293 does not lock the rack and pinion 291. The locking member 293 in the operating state remains in the locked position, and the locking member 293 in the standby state is released from the locked position and is therefore in the unlocked position.

[0643] like Figure 29 As shown and as described above, the preferred range of angle K20 (that is, the angle between the line connecting the axis of drum 62 and the axis of developing roller 32 and the line perpendicular to the first movable direction D200) is set by the structure of the main component A of the image forming apparatus. This will refer to... Figure 38 Please provide an explanation.

[0644] Figure 38 It is along Figure 29 A cross-sectional view of the main component A of the image forming apparatus, taken by line X202-X202 in part (a) to illustrate the preferred range of angle K20. The shapes of the individual components, which are not necessary for illustration, are shown in a simplified manner. Furthermore, as in Figure 29 As in part (b), in addition to the arrangement in this embodiment, for the purpose of illustration, Figure 38 The rack and pinion 291 shown is depicted as being shifted in both the positive and negative directions at angle K20.

[0645] Assuming that the positive range of angle K20 is angle K22 and the negative range is angle K23, the preferred range of angle K22 is determined by the shape of the drive side plate 15, and the preferred range of angle K23 is determined by the tilt direction DW1 of the drive transmission member 81.

[0646] First, the angle K22 will be explained. Angle K22 is the limiting angle at which the rack and pinion 291 does not interfere with the direction of arrow E28 when it moves along the first movable direction D200. In the main assembly A of the image forming apparatus in this embodiment, the space SP1 in the region downstream of the drive transmission member 81 along the cassette mounting direction C is relatively narrow. This is because the components constituting the main assembly A of the image forming apparatus are arranged in a region that does not interfere with the mounting trajectory of the cassette B, and in the main assembly A of the image forming apparatus in this embodiment, the drive source (motor) and the gear system connected thereto are arranged in space SP2. When the rack and pinion 291 moves, the angle at which it can enter space SP1 is K22, and angle K22 is preferably 50° or less.

[0647] Next, angle K23 will be explained. Figure 38 In the text, the definitions of each position are as follows.

[0648] Position PO1 is the connecting recess 81b of the drive transmission member 81 inclined in the inclined direction DW1 (see Figure 13 (etc.) at the center.

[0649] Position PO2 is the connecting protrusion 263b of drum 62 (see...) Figure 24 (The central position of ).

[0650] Position PO3 refers to the position where the drive transmission member 81 is engaged by reaction force FD20 (see...). Figure 34 The center position of the connecting recess 81b after the (a) part is moved.

[0651] At this time, the distance L22 between positions PO2 and PO3, measured in the direction perpendicular to the axis Ax1 of drum 62, corresponds to the eccentricity between the connecting protrusion 63b and the connecting recess 81b, as described in the section on the engagement conditions of the connecting member in Embodiment 1. That is, the angle K23 is the limiting angle when the distance L22 is the eccentricity that allows the connecting protrusion 63b and the connecting recess 81b to engage with each other, and is preferably -75° or more. The pressure angle of the gear portion 81a of the drive transmission member 81 is set to 20°, and the drive transmission member 81 moves in the same direction as the engagement reaction force FD20.

[0652] As described above, the preferred range of angle K20 is determined by the structure of the main component A of the image forming apparatus. Therefore, based on the main component of the image forming apparatus using this embodiment, the preferred range of angle K20 is appropriately determined considering the above conditions.

[0653] As described above, in this embodiment, just as in Embodiment 1 above, the force FA generated by the meshing of the rack and pinion 291 and the gear portion 81a of the drive transmission member 81 can also be used to move the drive transmission member 81 toward the box B, such as... Figure 35 As shown. The force FA generated by meshing can be used to connect the drive transmission member 81 to the box B.

[0654] By employing such a rack and pinion 291 in box B, the mechanism required to move the drive transmission member 81 toward box B within the main assembly A of the device can be simplified, as in Embodiment 1. For example, springs or the like that pushing the drive transmission member 81 toward box B within the main assembly A of the device can be eliminated, or the force of such springs or the like can be reduced.

[0655] In this embodiment, after the drive transmission member 81 approaches and connects to the housing B, the engagement between the drive transmission member 81 and the rack and pinion 291 is disengaged (see [link]). Figure 36 (Part (b)). This is because rack and pinion 291 can be moved to a position where it is not engaged with drive transmission member 81. Therefore, when the user removes box B from the main assembly A of the device, drive transmission member 81 and rack and pinion 291 are not engaged. As a result, the user can remove box B with less force. This is because the possibility of drive transmission member 81 and rack and pinion 291 impacting and interfering with the removal of box B is low.

[0656] <Variation 1 of Example 2>

[0657] In this embodiment, the rack and pinion mechanism transitions from a standby state to an operating state when the cartridge B is attached to the main component A of the image forming apparatus, but this transition occurs when the user closes the opening / closing door 13 (see...). Figure 8 This conversion can also be performed at other times. In the following text, a variant example 1, which is a partial modification of the structure of Embodiment 2, will be described. For ease of explanation, the structure described above can be referred to as a representative example of Embodiment 2, and the structure described below can be referred to as variant example 1 of Embodiment 2.

[0658] Figure 39 The operation of the rack and pinion mechanism 2900 in this variant example is shown, wherein (a) shows the standby state of the rack and pinion mechanism 2900 and (b) shows the operating state of the rack and pinion mechanism 2900.

[0659] like Figure 39 As shown in part (a), when the rack and pinion mechanism 2900 is in standby mode, the pressed surface 2970a of the pressed member 2970 protrudes beyond the cleaning frame 71 by a predetermined amount. The protruding direction of the pressed member 2970 is referred to as the fourth movable direction D204. The first support shaft 2990a of the linkage member 2990 is rotatably supported in the support hole 2970f of the pressed member 2970, and the second support shaft 2990b of the linkage member 2990 is rotatably supported in the support hole 2950g of the rotatable member 2950.

[0660] The pressed surface 2970a of the pressed member 2970 is pressed by the box pressing member 1 provided on the opening and closing door 13 along the fourth movable direction D204 in the direction of arrow E200. This movement is transmitted to the rotatable member 2950 through the linkage member 2990, and the rotatable member 2950 rotates in the rotation direction Q20 about the rotation axis Ax20. Through the rotation of the rotatable member 2950, ​​the rack and pinion mechanism 2900 becomes as in this embodiment through similar actions. Figure 39 The operating state is shown in part (b).

[0661] When the rack and pinion mechanism 2900 is in operation and the opening / closing door 13 is open to move the box pressing member 1 away from the pressed surface 2970a, the pressed member 2970 moves along the fourth movable direction D204 in the direction of arrow E201 via a spring (not shown). As the pressed member 2970 moves in the direction of arrow E201, the rotatable member 2950 rotates in the rotational direction Q21 about the rotation axis Ax3 via the connecting rod member 2990. Through the rotation of the rotatable member 2950, ​​the rack and pinion mechanism 2900 enters a similar state as in this embodiment. Figure 39 The standby state is shown in part (a).

[0662] The pressed member 2970 is an operating part that is operated to switch the rack and pinion mechanism 2900 between a standby state and an operating state. The rack and pinion mechanism 2900 includes the locking member 293 and the rack and pinion 291 described in Embodiment 2 above. By operating the pressed member 2970, a state switch is performed between a state in which the locking member 293 can lock the rack and pinion 291 and a state in which the locking member 293 does not lock the rack and pinion 291 and allows the rack and pinion 291 to move.

[0663] In order to accomplish the above operations, the movable range of the linkage member 2990 and the movable direction of the pressed member 2970 are appropriately limited.

[0664] In this variant, the pressed member 2970 is moved by the box pressing member 1 provided on the opening / closing door 13, but it can also be configured so that the user operates it directly. In such a case, the user operates the pressed member 2970 after the box B is installed in the main assembly A of the image forming apparatus.

[0665] <Variation 2 of Example 2>

[0666] Alternatively, instead of the rack and pinion 291 with gear portion 291a as described in Embodiment 2, a toothless elastic member (elastic body) can be provided on the drive side of the housing. Such a structure will be described in Variation 2 of Embodiment 2 below.

[0667] Figure 40 This is a diagram of the variant example. Figure 40 Part (a) is a perspective view of box B in this variant example, and Figure 40 Part (b) is a cross-sectional view showing engagement with the drive transmission member 81.

[0668] like Figure 40 As shown in part (a), the elastic movable member 2912a is provided on the sliding member 2912 (corresponding to rack and pinion 291) of the sliding mechanism 2902 (corresponding to rack and pinion mechanism 290).

[0669] The elastic movable member 2912a is capable of linear movement like the rack and pinion 291.

[0670] The elastic movable member 2912a is made of a material capable of elastic deformation (e.g., polyurethane foam, rubber, or elastomer). In this variant, polyurethane foam ESH, available from Inoac, or Moltoprene, also available from Inoac, is used. Furthermore, the distance from the rotation axis Ax1 of the drum 62 to the surface 2912a1 of the elastic movable member 2912a is set to 12.74 mm in the vertical direction D2072, perpendicular to the first movable direction D2002.

[0671] This distance corresponds to the shortest distance from axis Ax1 to surface 2912a1, measured along a direction perpendicular to axis Ax1. This distance also corresponds to the distance from the tangent line from axis Ax1 to surface 2912a1, measured along a direction perpendicular to axis Ax1. This distance is preferably 75-120% of the drum radius.

[0672] The elastic movable member 2912a is an elastic body and can be compressed and deformed by contact with the gear portion 81a of the drive transmission member 81. Therefore, the distance from the axis Ax1 of the drum 62 to the surface 2912a1 of the elastic movable member 2912a has a greater distance than the distances L21 and L22 in Embodiment 2 (see Figure 29 (b) provides a wider permissible range. Distances L21 and L22 are the distances from the axis Ax1 of the drum 62 to the gear portion 291a of the rack and pinion 291, and for details please refer back to the previous description.

[0673] In other respects, the preferred arrangement and preferred direction of movement of the elastic movable member 2912a are similar to the preferred arrangement and preferred direction of movement of the rack and pinion 291 described above as the main component of Embodiment 2.

[0674] However, the elastic movable member 2912a, as an elastic body, has a strong force for retaining the drive transmission member 81 when it meshes with the gear portion 81a of the drive transmission member 81. Therefore, the above references Figure 29 The preferred ranges for the angles K20 and K21 can be wider than those described above.

[0675] More specifically, in this variant, the preferred range of angle K20 is above -70 degrees and below 100 degrees. Similarly, in this variant, the preferred range of angle K21 is above -70 degrees and below 100 degrees.

[0676] The above description of the preferred range of angle K20 and the preferred range of angle K21 used in rack and pinion 291 can be applied to a more preferred range of angle K20 and the more preferred range of angle K21 used in elastic movable member 2912a.

[0677] As referenced above Figure 29 As described above, when observing the cassette along the axis Ax1 of the photosensitive drum, a line extending from the axis Ax1 of the photosensitive drum 62 and passing through the axis Ax2 of the developing roller 32 is used as a reference line. In this variant, the movable direction of the elastic movable member 2912a corresponds to... Figure 29 The movable direction D200 is shown. Similarly, the direction perpendicular to the movable direction of the elastic moving member 2912 corresponds to... Figure 29 The vertical direction D207 is shown. The angle formed between the vertical direction D207 and the baseline is K20.

[0678] In this variant, the vertical direction D207 is also the direction of the normal to the elastic movable member 2912a extending from the axis Ax1 of the drum 62.

[0679] The angle between the baseline and the line extending from the axis Ax1 of drum 62 toward the surface of the elastically movable member 2912a is K21. (See reference...) Figure 29 As described in part (a) of the rack and pinion 291, such as the gear portion 291a, it is preferable that at least a portion of the surface 2912a1 of the elastically movable member 2912a is located outside the connecting portion 263b. In other words, along the axis Ax1 of the drum 62 (see... Figure 29 When measured in part (a), at least a portion of the surface 2912a1 of the elastic movable member 2912a is further away from the non-drive end of the drum 62 than the connecting part 263a.

[0680] Additionally, it is preferable that the surface 2912a1 of the elastic movable member 2912a is at least partially exposed to the outside in a manner facing the axis Ax1 of the drum 62 (see [link]). Figure 40(a) This is because, as Figure 40 As shown in part (b), the surface 2912a1 of the elastic movable member 2912a needs to contact the drive transmission member 81 disposed between the surface 2912a1 and the axis Ax1.

[0681] like Figure 40 As shown in section (b), the elastically movable member 2912a enters the space between adjacent gear teeth of the gear portion 81a of the drive transmission member 81 and deforms to match the shape of the gear teeth. The deformed elastically movable member 2912a moves the drive transmission member 81 by the same action as the rack and pinion 291, and moves the sliding member 2912 in the direction of arrow E202 along the movable direction D2002. Thus, the same operation as the rack and pinion 291 is performed.

[0682] When the sliding member 2912 moves, the elastic movable member 2912a moves linearly or planarly along its surface 2912a1.

[0683] With this structure of the elastic movable member 2912a, the box can be engaged with the gear portion 81a of the drive transmission member 81. In this variant, the gear portion 81a meshes into the elastic movable member 2912a, which provides the advantage that the meshing state between the elastic movable member 2912a and the gear portion 81a is easily stabilized.

[0684] The meshing operation between the elastic movable member 2912a and the gear portion 81a is the same as the meshing operation between the elastic member and the gear portion 81a in Embodiment 4. Details will be described below with reference to Embodiment 4.

[0685] <Example 3>

[0686] Next, we will refer to the following. Figures 41 to 51 To illustrate Embodiment 3, in particular, those components that correspond to the components described in Embodiment 2 will be given the same names as the components in Embodiment 2, and only the differences from Embodiment 2 will be described.

[0687] First, refer to Figure 41 The box structure of this embodiment is described. Figure 41This is a perspective view of cartridge B. As in Embodiment 2, cartridge B in this embodiment includes a cleaning unit 260 and a developing unit 320. The developing unit 320 has a drive-side developing member 326. The drive-side developing member 326 is on the drive side of the cartridge and is part of the frame constituting the developing unit 320. The drive-side developing member 326 is provided with a friction application portion (friction material, friction member) 326a. In this embodiment, the friction application portion 326a is fixed to the drive-side developing member 326.

[0688] The direction along the rotation axis Ax1 of drum 62 is the longitudinal direction D302. The driving side of the drum flange 263 is the driving side, and the side opposite to the driving side is the non-driving side. The direction from the non-driving side to the driving side is indicated by the direction of arrow E32, and the direction from the driving side to the non-driving side is indicated by the direction of arrow E33.

[0689] Next, we will refer to Figure 42 The extent of the friction-applying portion 326a is described. Although details will be described below, the friction-applying portion 326a is a component configured to contact the gear portion 81a of the drive transmission member 81. Therefore, the preferred arrangement of the friction-applying portion 326a is similar to the gear portion 30a of the developing roller gear 30 in Embodiment 1, configured to mesh with the gear portion 81a (see [link to previous section]). Figure 9 (and) those preferred arrangements of the gear portion 291a of the rack and pinion 291 in Embodiment 2.

[0690] For example, the preferred arrangement of the friction application portion 326a in the axial direction of the photosensitive drum 62 is equivalent to the preferred range of the gear portion 30a and the gear portion 291a. The surface of the friction application portion 326a is at least partially exposed toward the axis Ax1 of the drum 62.

[0691] On the other hand, the friction application portion 326a of this embodiment has a specific preferred arrangement, which will be described in detail below.

[0692] Figure 42 The arrangement of the friction force application portion 326a is shown. Figure 42 Part (a) is a view taken along a direction perpendicular to the axis of rotation of drum 62, and Figure 42 Part (b) is along Figure 42 A cross-sectional view taken from line X300-X300 in part (a). Figure 42 Part (b) shows only the drum 62, the developing roller 32, and the friction application portion 326a. For ease of illustration, other than the arrangement in this embodiment, Figure 42Part (b) also shows the state in which the friction force application part 326a is arranged in the positive and negative directions at an angle K30, which will be described below. The positive angle is angle K30U and the negative angle is angle K30L.

[0693] like Figure 42 As shown in part (a), in the longitudinal direction D302, at least a portion of the friction application portion 326a is positioned beyond the free end 263b1 of the drive-side drum flange 263 along the direction of arrow E32 (longitudinally outward, away from box B). Furthermore, at least a portion of the friction application portion 326a is positioned within a range of 4 to 9 mm extending beyond the free end 263b1 toward the drive side. Depending on the structure of the drive-side drum flange 263 and the structure of the applicable image forming apparatus main assembly A, this range can be set even larger.

[0694] like Figure 42 As shown in part (b), the direction parallel to the friction force applying portion 326a in the direction perpendicular to the longitudinal direction D302 is called direction D300. In direction D301 perpendicular to direction D300, the distance from the axis of the drum 62 to the friction force applying portion 326a is called distance L30. When the friction force applying portion 326a is a rigid body, distance L30 is selected to be within the range of 90% to 120% of the radius of the drum 62, and particularly preferably within the range of 92% to 120% of the radius of the drum 62.

[0695] In this embodiment, the radius of the drum 62 is 12 mm. The distance L30 from the axis of the drum 62 to the friction application portion 326a is set to 10.8 mm (i.e., 90% of the radius of the drum 62) or more; and more preferably, it is set to 11.041 mm (i.e., 92% of the radius of the drum 62) or more. Furthermore, L30 is set to 14.439 mm (i.e., 120% of the radius of the drum 62) or less. In this embodiment, the distance L30 is set to 106.2% (12.74 mm) of the radius of the drum 62.

[0696] Furthermore, when the friction application portion 326a is an elastomer (elastic member), the distance L30 when no load is applied to the friction application portion 326a is set within the range of 75% to 120% of the radius of the drum 62. This is because when the cartridge B is installed in the main assembly A of the image forming apparatus and the friction application portion 326a deforms, the distance L30 is within the range of 90% to 120%, and more preferably within the range of 92% to 120%.

[0697] Additionally, when the surface of the friction application portion 326a is not a flat surface, the direction of the tangent (cutting plane) of at least a portion of the friction application portion 326a is direction D300, and in such a case, the friction application portion 326a may be an arcuate surface having a portion protruding or recessed toward the rotation axis Ax1 of the drum 62, or it may be a surface including the uneven portion.

[0698] A straight line extending from the axis of drum 62 through the axis of developing roller 32 is used as a reference. Angle K30 is the angle formed between this reference line and the direction D301 perpendicular to the friction application portion 326a. Direction D301 is the direction of a straight line extending through the friction application portion 236a and away from the axis of drum 62. In other words, D301 is the direction of the normal to the friction application portion 326a away from drum 62.

[0699] The positive direction of angle K30 is the downstream direction of the rotation of drum 62. In other words, the positive direction of angle K30 is the downstream direction of arrow R, which is the direction of rotation of drum 62, and the negative direction of angle K30 is the upstream direction of arrow R. Preferably, angle K30 is greater than -70° and less than 100°.

[0700] More specifically, the preferred range of angle K30 varies depending on the material used for the friction application portion 326a. The preferred range (degrees) of angle K30 for the material of the friction application portion 326a is shown below.

[0701] When using stretch film (also known as "packaging film") as the friction application part 326a, the preferred range of angle K30 is equal to or greater than 0 degrees and equal to or less than 100 degrees.

[0702] When double-sided tape is used as the friction application part 326a, the preferred range of angle K30 is equal to or greater than -50 degrees and equal to or less than 100 degrees.

[0703] When polyurethane foam is used as the friction application part 326a, the preferred range of angle K30 is above -70 degrees and below 100 degrees.

[0704] For silicon wafers, the preferred range for angle K30 is above -50 degrees and below 100 degrees.

[0705] For stretch film, use LWFS-30-600 (particle size #600) available from Sankyo Rikagaku Ltd., Japan.

[0706] For double-sided tape, use No. 5000N(C) sold by Nitto Denko Co., Ltd. of Japan.

[0707] For polyurethane foam, ESH, sold by Inoac Corporation of Japan, is used.

[0708] according to Figure 51 Set the angle K30 and position the friction force application part 326a.

[0709] In this embodiment, the abrasive film (a plastic film used for abrasion) is used as a rigid material with a high coefficient of friction. Here, the abrasive film is the abrasive material. Angle K30 is 0°.

[0710] In order to make the friction force application portion 326a act stably on the drive transmission member 81, and in order to easily ensure the space for arranging the friction force application portion 326a in the main assembly, it is further preferred to reduce the range of angle K30.

[0711] For a more suitable range for K30, a reference can be applied. Figure 29 The appropriate range of the angle K20 described.

[0712] In this embodiment, angle K30 is also the angle between the reference line and the line extending from the axis Ax1 of the drum 62 through the friction application portion 326a. Ideally, at least a portion of the friction application portion 326a is within a suitable range of angle K30.

[0713] The preferred ranges of the aforementioned angle K30 and distance L30 are determined by their relationship with respect to the main component A of the image forming apparatus to which this embodiment is applied, and the details thereof will be described below.

[0714] In this embodiment, such as Figure 42 As shown, the friction application portion 326a is provided on the drive-side developing member 326, which is part of the developing unit 320. However, depending on the setting of angle K30 and distance L30, the friction application portion 326a can be provided on the cleaning unit 260 (see [reference]). Figure 41 On a part of ).

[0715] <Drive transmission structure of the main component of the image forming apparatus>

[0716] Next, we will use Figure 43 The drive transmission structure of the drive transmission member 81 of the main component A of the image forming apparatus in this embodiment is described. Figure 43 The drive system of the main component A of the image forming apparatus is shown, wherein (a) is a side view seen from the drive side and (b) is a perspective view seen from the drive side.

[0717] like Figure 43As shown in part (a), the driving force is transmitted from the motor gear 51, which is connected to the drive source of the motor (not shown) as the main component A of the image forming apparatus, to the drive transmission member 81 via the first idler gear 52 and the second idler gear 53. The second gear portion 81k of the drive transmission member 81 meshes with the gear portion 53a of the second idler gear 53. Accordingly, the motor gear 51 rotates in the rotational direction Q30, the first idler gear 52 rotates in the rotational direction Q31, the second idler gear 53 rotates in the rotational direction Q32, and the drive transmission member 81 rotates in the rotational direction CW.

[0718] like Figure 43 As shown in part (b), the second gear portion 81k of the drive transmission member 81 has right-hand helical teeth, and the gear portion 53a of the second idler gear 53 has left-hand helical teeth, thereby generating a thrust F30 corresponding to the torque of the drive transmission member 81 through meshing.

[0719] Here, the second idler gear 53 is fixed in the longitudinal direction. Furthermore, the drive transmission member 81 is supported to be movable in the longitudinal direction, and therefore, due to the aforementioned torsional direction, the thrust F30 causes the drive transmission member 81 to move toward the inside of the main assembly A of the image forming apparatus (in the direction of arrow DW3 toward the cartridge). The direction of the thrust F30 is the same as the direction of the axial (longitudinal) force FA generated in the gear portion 81a of the drive transmission member 81 as described in Embodiments 1 and 2 (see...). Figure 13 and Figure 35 ).

[0720] <Install the box to the main assembly of the image forming apparatus>

[0721] Next, we will refer to Figure 44 The operation of mounting cartridge B to the main component A of the image forming apparatus is described in this embodiment. Figure 44 It shows along Figure 42 The cross-sectional view of the installation operation of mounting box B to the main component A of the image forming apparatus, taken by line X302-X302 in part (a). Figure 42 Part (a) shows the state before the box is installed, and part (b) shows the state after the box is installed.

[0722] like Figure 44As shown in part (a), before the cartridge B is installed in the main assembly A of the image forming apparatus, the friction-applying portion 326a contacts the gear portion 81a of the drive transmission member 81. When the cartridge B moves from this position along the mounting direction C, the gear portion 81a of the drive transmission member 81 interferes with the friction-applying portion 326a. However, as described in Embodiment 2, the gear portion 81a of the drive transmission member 81 can be tilted in a direction D206 perpendicular to the tilting direction DW1. Therefore, when the gear portion 81a interferes with the friction-applying portion 326a during the installation of the cartridge B, it can avoid interference in direction D206. This allows the cartridge B to be installed without interference between the friction-applying portion 326a and the gear portion 81a. Then, the cartridge B is inserted into... Figure 44 The installation status is shown in section (b).

[0723] At this time, the gear portion 81a of the drive transmission member 81, due to its own weight, abuts against the friction application portion 326a and the hole portion 15n of the drive side plate 15, thereby determining its position (see...). Figure 32 ).

[0724] <Jointing operation of drive transmission components>

[0725] Next, we will refer to Figures 45 to 47 The operation is described until the drive transmission member 81 is driven by the motor gear 51 and the connecting recess 81b engages with the connecting protrusion 263b of the drive-side drum flange 263. Figure 45 It shows along Figure 42 The cross-sectional view of the operation when the drive transmission member 81 is driven, taken by line X302-X302 in part (a). Figure 45 Part (a) shows the inclined driving state of the drive transmission member 81, and Figure 45 Part (b) shows the state in which the drive transmission member 81 has been moved to a position where it can engage with the drive-side drum flange 263. Figure 46 This is a cross-sectional perspective view showing the engagement operation of the drive transmission member 81, and is along... Figure 45 The cross-sectional view taken by line X301-X301 shown in part (b). Figure 46 Part (a) shows the alignment of the drive transmission member 81 with the rotation axis Ax1 of the drum 62, and Figure 46 Part (b) shows the engagement state of the connecting recess 81b and the connecting protrusion 263b of the drive-side drum flange 263. Figure 47 This is a view showing the state of elastic deformation of the portion 326a subjected to frictional force. Figure 46 Part (a) is along Figure 42 The cross-sectional view taken by line X302-X302 shown in part (a), and Figure 46Part (b) is along Figure 42 The cross-sectional view taken by line X303-X303 shown in part (a). In the following text, for ease of explanation, the tooth tips of each tooth in the gear portion 81a of the drive transmission member 81 are referred to as tooth tips 81a1, and the surfaces of each tooth downstream in the rotational direction CW are referred to as tooth surfaces 81a2 (see [reference]). Figure 45 ).

[0726] The following text will describe two cases: the case where the friction-applying part 326a deforms by contacting the gear part 81a of the drive transmission member 81, and the case where it does not deform.

[0727] First, we will describe a case where the friction-applying portion 326a is so hard that it does not elastically deform even when it comes into contact with the gear portion 81a. In the components illustrated above, this corresponds to the case where a wound film is used as the friction-applying portion 326a.

[0728] Even if friction causes partial elastic deformation (326a), as long as the degree of deformation is small enough to be negligible, such a case is also included in the case of no elastic deformation.

[0729] like Figure 45 As shown in part (a), when the drive transmission member 81 rotates in the rotation direction CW, the tooth tip 81a1 of the gear portion 81a rubs against the friction force application portion 326a and receives the friction force F31. As described in Embodiment 2, the position of the gear portion 81a of the inclined drive transmission member 81 is not restricted in the direction opposite to the inclination direction DW1 or in the direction D206 perpendicular to the direction D205, and therefore can move in the direction of arrow E30 along the direction D300 parallel to the friction force application portion 326a. Therefore, the gear portion 81a moves in the direction of arrow E30 by the friction force F31. When the gear portion 81a moves, the rotation axis Ax3 approaches the rotation axis Ax1 of the drum 62. Thereafter, the gear portion 81a abuts against the limiting portion 73j, and as Figure 45 As shown in part (b), the drive transmission member 81 becomes substantially coaxial with the drive-side drum flange 263 and is in an engageable position. Furthermore, the connecting recess 81b and the connecting protrusion 263b remain in an engageable position in a direction perpendicular to the longitudinal direction.

[0730] like Figure 46 As shown in part (a), the frictional force F31 generates a torque T30 in the gear portion 81a of the drive transmission member 81. Due to meshing with the gear portion 53a of the second idler gear 53, the torque T30 generates a thrust F30 in the second gear portion 81k of the drive transmission member 81 (see [reference]). Figure 43 (part (b)).

[0731] The drive transmission member 81 moves in the direction of arrow DW3 along the longitudinal direction D302 toward the non-drive side (near the box) by a thrust F30, and approaches and contacts the connecting protrusion 263b. Then, when the triangular phases of the connecting recess 81b and the connecting protrusion 263b match each other due to the rotation of the drive transmission member 81, the connecting protrusion 263b enters the connecting recess 81b and engages with the connecting recess 81b, as shown. Figure 46 As shown in part (b). Then, as in embodiment 1, when the surfaces constituting the connecting protrusion 263b and the connecting recess 81b come into contact with each other and transmit drive, a new thrust FC is generated because both of them twist (tilt) about the axis.

[0732] Next, the elastic deformation of the friction-applying portion 326a via the gear portion 81a will be explained. In the component illustrated above, this corresponds to the case where double-sided tape, polyurethane foam, or silicone sheet is used as the friction-applying portion 326a.

[0733] like Figure 47 As shown in part (a), when the friction force applying part 326a is an elastic body with a soft surface layer, the tooth tip 81a1 of the gear part 81a engages with the friction force applying part 326a. In other words, the friction force applying part 326a enters the space S30 between adjacent gear teeth of the gear part 81a. In this state, when the drive transmission member 81 rotates in the rotation direction CW, the tooth surface 81a2 receives the component force F33 of the reaction force from the friction force applying part 326a in the rotation direction CW. In addition, since the friction force F31 from the friction force applying part 326a also acts on the tooth tip 81a1 of the gear part 81a, the force that moves the gear part 81a is the resultant force F34 of the friction force F31 and the component force F33. Therefore, compared with when the friction force applying part 326a does not elastically deform the gear part 81a, the gear part 81a can be moved with a greater force.

[0734] In addition, such as Figure 47 As shown in part (b), the gear portion 81a, which is a helical tooth (shown in shaded line in the figure), receives a component force F33 from the friction force application portion 326a on the tooth surface 81a2, thereby generating a thrust F35 in the direction of arrow DW3. Furthermore, in the drive transmission member 81, the resultant force F34 of the friction force F31 and the component force F33 (see...) Figure 47The (a) portion generates a torque T31 greater than the frictional force F31 alone, and generates a thrust F36 in the direction of arrow DW3 in the second gear portion 81k. The drive transmission member 81 moves in the direction of arrow DW3 by the thrust F35 generated in the gear portion 81a and the thrust F36 generated in the second gear portion 81k. Therefore, when using a screw, the drive transmission member 81 can be moved in the longitudinal direction d302 with a greater force than when the frictional force application portion 326a does not elastically deform through the gear portion 81a.

[0735] After engagement between the connecting recess 81b and the connecting protrusion 263b, the gear portion 81a and the friction force applying portion 326a can either contact or separate from each other. However, the torque T30 generated by the frictional force F31 between the gear portion 81a and the friction force applying portion 326a (or the torque T31 generated by the resultant force F34) increases the power consumed by the drive source (motor). Therefore, it is preferable that the gear portion 81a and the friction force applying portion 326a are spaced apart from each other.

[0736] By positioning the friction force application portion 326a within a suitable range, the engagement operation of the drive transmission member 81 described above can be easily achieved. The suitable range has been described above, but will be explained in detail here. (Refer to...) Figures 48 to 50 Please provide an explanation.

[0737] First, the direction parallel to the surface of the friction-applying portion 326a is called direction D300. In other words, D300 is the direction along the tangent to the surface of the friction-applying portion 326a. The direction perpendicular to the tangent direction D300 is direction D301. In other words, D301 is the normal direction of the friction-applying portion 326a.

[0738] Reference Figure 48 The preferred range of the distance L30 from the axis of the drum 62 to the surface of the friction force application portion 326a in the vertical direction D301 will be described.

[0739] Here, L30 corresponds to the distance from the axis Ax1 of the drum 62 to the tangent of the friction force application portion 326a, measured along a direction perpendicular to the axis Ax1 of the drum 62. Additionally, L30 also corresponds to the shortest distance from the axis Ax1 of the drum 62 to the friction force application portion 326a, measured along a direction perpendicular to the axis Ax1 of the drum 62.

[0740] Figure 48 This is a diagram showing the relationship between the distance L30 from the axis of the drum 62 to the friction force application portion 326a and the gear portion 81a of the drive transmission member 81. Figure 48Parts (a), (b), and (c) are illustrations of changing the value of distance L30 to change the position of the friction force application part 326a. Figure 48 Part (a) shows the case where distance L30 is the applicable value for this embodiment. Figure 48 Part (b) shows the case where the distance L30 is set within the preferred range along the lower limit direction, and Figure 48 Part (c) shows the case where the distance L30 is set outside the preferred range along the lower limit direction.

[0741] First, the case where the distance L30 is 106.2% of the radius of drum 62 (12.74 mm, which is the applicable value for this embodiment) will be explained. Figure 48 As shown in part (a), the connecting recess 81b and the connecting protrusion 263b are aligned with each other at their center positions in the direction D301 perpendicular to the direction D300.

[0742] Next, the case where the distance L30 is set within a preferred range in the lower limit direction (the side of the friction force application portion 326a that is close to the rotation axis Ax of the drum 62) will be explained. Figure 48 As shown in part (b), when the distance L30 is set along the lower limit direction, the distance between the friction force applying part 326a and the center Ax1 of the rotation axis of the drum 62 becomes smaller. Therefore, the distance between the connecting protrusion 263b fixed to the drum 62 and the friction force applying part 326a becomes smaller. When the friction force applying part 326a contacts the gear part 81a in this state, an eccentricity is generated between the connecting recess 81b and the connecting protrusion 263b. This eccentricity is referred to as A30. As described in Embodiment 1, as a coupling condition applied to the main component A of the image forming apparatus in this embodiment, the eccentricity A30 needs to be 1.699 mm or less. When the drum radius of this embodiment is 12 mm and the distance L30 is 92% (11.041 mm) of the radius of the drum 62, which is the lower limit, the eccentricity A30 is 1.699 mm.

[0743] Next, the case where the distance L30 is outside the preferred range along the lower limit direction will be described. For example... Figure 48 As shown in part (c), the distance between the center of the friction application part 326a and the center of the drum 62 is closer, causing the connecting protrusion 263b to be closer to the friction application part 326a. When the friction application part 326a abuts against the gear part 81a in this state, the eccentricity A30 is 1.699 mm or more, causing the connecting recess 81b and the connecting protrusion 263b to not engage with each other.

[0744] As mentioned above, the distance L30 needs to be set to more than 92% (11.041 mm) of the radius of the drum 62, and this is the preferred range for the lower limit of the distance L30.

[0745] This also applies to the upper limit of the preferred range of distance L, and therefore its description is omitted.

[0746] Next, refer to Figure 50 The preferred range of the upper limit of the angle K30 formed by the direction D301 relative to the line extending from the axis of the drum 62 and passing through the axis of the developing roller 32 will be explained. The direction of the line extending away from the drum axis Ax1 through the friction force applying portion 326a and perpendicular to the surface of the friction force applying portion 326a corresponds to the direction D301.

[0747] Figure 50 This is a diagram showing the upper limit of angle K30. Angle K31 is the angle between the baseline passing through the rotation axis Ax2 of the developing roller 32 and the rotation axis Ax1 of the drum 62, and the tilt direction DW1. Figure 50 Part (a) shows the case where angle K30 is equal to or less than angle K31, and Figure 50 Part (b) shows the case where angle K30 is equal to or greater than angle K31.

[0748] Here, the center position of the gear portion 81a of the drive transmission member 81 inclined towards DW1 is position PO31, the position after the friction force application portion 326a abuts against the gear portion 81a is position PO32, and the center position of the drum 62 is position PO33. Furthermore, the distance between position PO32 (where the friction force application portion 326a abuts against the gear portion 81a and moves) and position PO33 (where the rotation axis Ax1 of the drum 62 is located) is defined as distance L31.

[0749] Figure 50 Part (a) shows the case where angle K30 is equal to or less than angle K31. The position where the friction force applying part 326a abuts against the gear part 81a and moves is PO32. The direction in which the gear part 81a moves through the friction force applying part 326a is the direction of arrow E30. Position PO32 is located upstream of position PO33 on the rotation axis Ax1 of the drum 62 in the direction of arrow E30. At this time, when the gear part 81a moves through the friction force applying part 326a in the direction of arrow E30, it approaches the rotation axis Ax1 of the drum 62.

[0750] on the other hand, Figure 50Part (b) shows the case where angle K30 is equal to or greater than angle K31. The position where the friction application part 326a abuts against the gear part 81a and moves is position PO32. The direction in which the gear part 81a moves via the friction application part 326a is the direction of arrow E30. In the direction of arrow E30, position PO32 is downstream of position PO33 on the rotation axis Ax1 of the drum 62. At this time, when the gear part 81a moves via the friction application part 326a in the direction of arrow E30, it moves away from the rotation axis Ax1 of the drum 62. In order for the coupling to engage in this state, the distance L31 needs to be reduced. The distance L31 increases with the increase of angle K30. The angle K30 at which the coupling can engage is the upper limit of the preferred range.

[0751] Next, refer to Figure 49 The preferred range of the lower limit of the angle K30 formed by the line connecting the direction D301 with respect to the axis of the connecting drum 62 and the axis of the developing roller 32 will be explained. Figure 49 In the diagram, a line extending from the rotation axis Ax1 of the drum 62 and passing through the rotation axis Ax2 of the developing roller 32 is shown as a reference line. The angle formed by the direction D301, which is perpendicular to the direction D300 parallel to the friction force application portion 326a, with respect to this reference line is defined as angle K30 (see [reference]). Figure 42 (b) of the document). The direction D301 is indicated by an arrow pointing to the normal to the friction force applying portion 326a. More specifically, the arrow indicating the direction D301 is the normal direction of the friction force applying portion 326a extending away from the axis Ax of the drum 62.

[0752] Figure 49 This is a diagram illustrating the lower limit of angle K30, where... Figure 49 Part (a) shows the case where angle K30 is within the preferred range, and Figure 49 Part (b) shows the case where the angle K30 is outside the preferred range.

[0753] like Figure 49As shown in part (a), at the contact portion between the gear portion 81a and the friction force applying portion 326a, the gear portion 81a generates a force FG1 in the direction of arrow E31 due to its own weight FG. This force FG1 includes a component along direction D300 in the gravitational direction DZ1. Furthermore, at the contact portion between the gear portion 81a and the friction force applying portion 326a, the gear portion 81a receives a reaction force FG2 due to its own weight FG. When the gear portion 81a rotates in the rotation direction CW, a frictional force F31 is generated due to the reaction force FG2. Furthermore, when the friction force applying portion 326a elastically deforms, the resulting resultant force F34 includes not only the frictional force F31 but also the reaction force F33. When the angle K30 is within a preferred range, either the frictional force F31 or the resultant force F34 is greater than the force FG1. Therefore, the gear portion 81a can overcome the force FG1 and move in the direction of arrow E30 by the frictional force F31 or the resultant force F34.

[0754] On the other hand, when the angle K30 is less than the lower limit of the preferred range, such as Figure 49 As shown in part (b), the force FG1 is larger and the frictional force F31 or the resultant force F34 is smaller. As a result, the frictional force F31 or the resultant force F34 is less than the force FG1 in the direction of arrow E31. Therefore, the gear part 81a cannot move in the direction of arrow E30. In other words, the inclined drive transmission member 81 cannot move to the engagement position, and therefore, the coupling cannot engage.

[0755] Frictional force F31 or component force F33 as part of resultant force 34 (see...) Figure 47 The (b) portion varies depending on the material of the friction-applying portion 326a and is affected by the coefficient of friction, surface softness, and material viscosity.

[0756] Abrasive films (plastic films used for polishing) are cited as representative materials with a high coefficient of friction and no elastic deformation, i.e., inelastic materials.

[0757] Double-sided tape is cited as a representative material with high adhesion. It is one of the adhesive components with strong adhesion. Various materials with different degrees of flexibility can be used as the substrate for double-sided tape; therefore, whether double-sided tape is an elastic component depends on the choice of substrate.

[0758] Polyurethane foam is cited as a material with a soft surface, that is, a representative elastic component.

[0759] In addition, silicone sheets are listed as materials that combine friction and flexibility. Silicone sheets are also a type of elastic component.

[0760] The preferred range of the lower limit side of angle K30 increases in the order of stretch film, double-sided tape and silicone sheet, and polyurethane foam.

[0761] In this embodiment, when cartridge B is installed in the main assembly A of the image forming apparatus, the developing roller 32 is positioned approximately 30° counterclockwise away from the direction of gravity DZ1 along the circumferential direction of rotation Ax1 around the drum 62. In other words, when viewed along the axis Ax1 of the drum 62, a straight line extending from the axis Ax1 of the drum 62 and passing through the axis of the developing roller 32 forms a 30° angle counterclockwise relative to a straight line extending in the direction of gravity DZ1.

[0762] If the developing roller 32 of cartridge B in this embodiment is not set at an angle of 30°, the preferred range of angle K30 increases or decreases with the angle difference. For example, if the developing roller 32 is located at a position 20° counterclockwise from the rotation axis Ax1 of the drum 62 in the direction of gravity DZ1, the preferred range of angle K30 for applying the wrapping film to the friction application portion 326a is -10° or more and 90° or less.

[0763] As described above, the preferred ranges for distance L30 and angle K30 are used to define the engagement range for the connecting member. These values ​​depend on the structure of the main component A of the image forming apparatus to which this embodiment is applied. Depending on the structure of the main component A of the image forming apparatus to which this embodiment is applied, the preferred ranges for distance L30 and angle K30 are not limited to those values.

[0764] The coefficients of friction of components exemplified as materials that can be used in the friction-applying part 336a are as follows: Polyurethane foam has a coefficient of friction of 2.61. Silicone sheet has a coefficient of friction of 0.87. Stretch film has a coefficient of friction of 0.75.

[0765] For comparison, the coefficient of friction of the box frame is as follows.

[0766] The POM resin constituting the frame portion of the support drum 62 has a coefficient of friction of 0.34. Here, in this embodiment, the frame portion of the support drum 62 is a drum bearing 73.

[0767] The coefficient of friction of the PS resin constituting the frame portion exposed to the outside is 0.46. In this embodiment, the coefficient of friction of the frame portion exposed to the outside corresponds to the coefficient of friction of the clean frame 71.

[0768] Therefore, the coefficient of friction of the friction-applying portion 336a is higher than the coefficient of friction of the frame of the box. As mentioned above, the coefficient of friction of the frame portion exposed to the outside (e.g., the cleaning frame 71) is generally higher than the coefficient of friction of the bearing portion of the frame (i.e., the drum bearing 73). In this embodiment, the coefficient of friction of the friction-applying portion 336a is selected to be higher than the coefficient of friction of the frame portion exposed to the outside.

[0769] The friction coefficient of the friction-applying part 336a is more than 1.5 times that of the bearing part of the frame.

[0770] The coefficient of friction of the friction-applied part 336a is more than 1.5 times that of the frame part exposed to the outside.

[0771] Figure 51 The method shown in part (a) is used in this embodiment as a method for measuring the coefficient of friction. A small measuring object OJ is placed on an inclined plane SL made of ABS resin. Subsequently, the inclination of the ABS resin inclined plane SL is increased, and the angle of the inclined plane when the measuring object OJ begins to slide along the inclined plane SL is determined as angle θ. The value of tanθ is determined as the coefficient of friction of the measuring object OJ.

[0772] In this embodiment, when the elastic member is used as the friction force application part 336a, the degree of elasticity is checked by the following method.

[0773] A measuring probe (contact element) CT with a surface area of ​​2×5mm is pressed against a measuring object with an original thickness T1 of 3mm for 10 seconds using a force of Fms=50gf. At this time, when the reduction in the thickness of the measuring object OJ is ΔT[mm], the value obtained by dividing ΔT[mm] by the original thickness T1=3mm is taken as the degree of deformation.

[0774] For example, when a polyurethane foam with an original thickness T1 of 3 mm is pressed by a probe CT, the measured thickness T2 after deformation is 0.78 mm. The thickness reduction is T1 - T2 = 2.22 mm, and the deformation degree ΔT / T1 is 2.22 / 3 = 0.74. The deformation degree of the silicon wafer is 0.02.

[0775] In this embodiment, a member with a deformation degree of 0.01 or greater is considered an elastic member. Preferably, an elastic member with a deformation degree of 0.9 or less is used. This is because if the elastic member is more prone to deformation exceeding this value, it may be deeply engaged by the gear portion 81a when it comes into contact with the drive transmission member 81, thus hindering the movement of the drive transmission member 81.

[0776] As described above, in this embodiment, by bringing the drive transmission member 81 into contact with the friction application portion 336a of the box B, the drive transmission member 81 can also be brought close to and connected to the box B. The use of the friction application portion 336a in this embodiment offers the advantage of further simplifying the box structure compared to the embodiments described above.

[0777] <Example 4>

[0778] Next, we will refer to Figures 52 to 55 Description of Embodiment 4. Specifically, in the elements disclosed in this embodiment, those components corresponding to the components described in the above embodiments will be given the same names as the components in the above embodiments, and only the differences will be described. In this embodiment, the direction along the rotation axis Ax1 of the drum 62 is the longitudinal direction D402, one side of the driving-side drum flange 263 is the driving side, and the side opposite to the driving side is the non-driving side. Furthermore, the direction from the non-driving side towards the driving side is the direction of arrow E40, and the direction from the driving side towards the non-driving side is the direction of arrow E41.

[0779] First, refer to Figure 52 and Figure 53 The box structure of this embodiment is described. Figure 52 This is a perspective view of box B.

[0780] like Figure 52 As shown, cartridge B in this embodiment includes a cleaning unit 260 and a developing unit 420, as in embodiment 1. The developing unit 420 includes a resiliently rotatable member 490.

[0781] The elastic rotatable member 490 is a cylindrical rotatable member and is made of a main component (elastic member) of an elastic material capable of elastic deformation, such as polyurethane foam, rubber, or elastomer. In this embodiment, ESH, which is available from Inoac Corporation of Japan, or Moltoprene, which is also available from Inoac Corporation of Japan, is used as the polyurethane foam. In this embodiment, the outer diameter portion 490a of the cylindrical shape has a radius of 5.84 mm. The elastic rotatable member 490 is disposed on the support shaft 32a of the developing roller 32 and is capable of rotating integrally with the developing roller 32. The elastic rotatable member 490 can be configured to rotate relative to the support shaft 32a.

[0782] Next, refer to Figure 53 The arrangement of the elastically rotatable member 490 will be described below. As will be described in detail below, the elastically movable member 2912a of variant 2 of embodiment 2 (see Figure 40 Similar to part (b), the resilient rotatable member 490 is configured to engage with the gear portion 81a of the drive transmission member 81 via elastic deformation. Therefore, the preferred range of the resilient rotatable member 490 can be applied to the preferred range of the resilient movable member 2912a. The specific features of the resilient rotatable member 490 will be described in particular detail below.

[0783] Figure 53 This is a diagram showing the structure of box B. Figure 53 Part (a) is a view seen in a direction perpendicular to the axis of rotation of drum 62, and Figure 53 Part (b) is along Figure 53 A cross-sectional view taken by line X400-X400 in part (a). For better illustration, in Figure 53 Part (a) only shows the drum 62 and the drive-side drum flange 263, which are components constituting the cleaning unit 260. Similarly, Figure 53 Part (b) shows only the drum 62, the developing roller 32, and the flexible rotatable member 490. For ease of illustration, other than the arrangement in this embodiment, Figure 53 Part (b) also shows the state in which the resilient rotatable member 490, which will be described below, is displaced in the positive or negative direction by an angle K40, wherein the positive angle is indicated by angle K40U and the negative angle is indicated by angle K40L.

[0784] like Figure 53 As shown in part (a), in the longitudinal direction D402, as in embodiment 3, at least a portion of the resilient rotatable member 490 is positioned to be displaced from the free end 263b1 of the connecting portion 263b of the drive-side drum flange 263 along the direction of arrow E40. In other words, at least a portion of the resilient rotatable member 490 is located outside the free end 263b1 in the longitudinal direction. That is, at least a portion of the resilient rotatable member 490 is positioned further away from the non-drive side of the box B than the free end 263b1.

[0785] Specifically, in this embodiment, at least a portion of the elastic rotatable member 490 is disposed within a range of 4 to 9 mm from the free end 263b1 toward the drive side. It should be noted that, depending on the structure of the drive-side drum flange 263 and the structure of the applicable image forming apparatus main assembly A, this range can be selected to be larger.

[0786] Figure 53 Part (b) is a schematic diagram of the box as viewed along the longitudinal direction D402. The direction of the straight line extending from the rotation axis Ax1 of the drum 62 to pass through the rotation axis Ax40 of the elastic rotatable member 490 is called direction D400.

[0787] The arrow indicating direction D400 is a straight line perpendicular to the rotation axis Ax1 and the longitudinal direction D402. The distance from the axis of drum 62 to the outer diameter portion 490a of the elastic rotatable member 490, measured along direction D400 perpendicular to the rotation axis Ax1, is called distance L40. Here, similar to the case where the friction application portion 326a is an elastomer as described in Embodiment 3, distance L40 is selected in the range of 75% to 120% of the radius of drum 62. In this embodiment, the radius of drum 62 is 12 mm, and distance L40 is selected as 95.67% (11.48 mm) of the radius of drum 62.

[0788] Using the straight line connecting the rotation axis Ax1 of the drum 62 and the rotation axis Ax2 of the developing roller 32 as a reference line, the angle between direction D400 and this reference line is called angle K40. Angle K40 is positive downstream of the direction of arrow R, which is the rotation direction of the drum 62, and negative upstream of the direction of arrow R. In this case, the preferred range of angle K40 is set in the range of -70 to 100 degrees, which is similar to the case where the elastic moving member in variant 2 of embodiment 2 uses polyurethane foam. In this embodiment, angle K40 is set to 0°. As in embodiment 3, the preferred range of angle K40 and distance L40 described above is determined according to the relationship with the main component A of the image forming apparatus used.

[0789] In this embodiment, the elastic rotatable member 490 is disposed on the support shaft 32a of the developing roller 32, but this is not mandatory. Depending on the setting of angle K40 and distance L40, the elastic rotatable member 490 may be disposed on the shaft disposed on the developing side member 426 or the cleaning unit 260.

[0790] Next, we will refer to Figure 54 The operation of driving the drive transmission member 81 and engaging the connecting recess 81b with the connecting protrusion 263b of the drive-side drum flange 263 will be described. Figure 54 It is along Figure 53 The section shown in part (a) is a cross-sectional view of the operation when the mounting box B is mounted and the drive transmission member 81 is driven. Figure 54 Part (a) shows the state immediately following the installation of box B and after the drive transmission member 81 is driven, and Figure 54 Part (b) shows that the drive transmission member 81 has been moved and is in a position where it can engage with the drive-side drum flange 263.

[0791] like Figure 54 As shown in part (a), when the cartridge B is installed in the main assembly A of the image forming apparatus, the elastic rotatable member 490 enters the space S40 between adjacent gear teeth of the gear portion 81a, similar to the case using polyurethane foam in Embodiment 3. In this state, when the drive transmission member 81 rotates in the rotation direction CW, the tooth surface 81a2 receives a reaction force F40 from the elastic rotatable member 490, and the gear portion 81a moves in the direction of the reaction force F40. Through the movement of the gear portion, the rotation axis Ax3 approaches the rotation axis Ax1 of the drum 62. Thereafter, the gear portion 81a abuts against the limiting portion 73j, and as... Figure 54As shown in part (b), the drive transmission member 81 becomes substantially coaxial with the drive-side drum flange 263. At this time, the connecting recess 81b and the connecting protrusion 263b also become substantially coaxial and are in an engageable position.

[0792] At this time, the elastic rotating member 490 rotates in the rotation direction R 40 by the force F41 received from the tooth surface 81a2 of the gear part 81a.

[0793] like Figure 55 As shown, the reaction force F40 received from the rotating elastic rotatable member 490 generates a thrust F42 on the tooth surface 81a2 of the helical gear portion 81a (shown by the shaded line in the figure) in the direction of arrow DW3. This thrust F42 causes the drive transmission member 81 to move in the direction of arrow DW3.

[0794] The subsequent joining operations are similar to those in the foregoing embodiments, and therefore their description is omitted.

[0795] Compared to the friction application portion 326a described in Embodiment 3, the elastic rotatable member 490 of this embodiment moves the gear portion 81a of the drive transmission member 81 and also receives the driving force from the gear portion 81a. The driving force received by the elastic rotatable member 490 can be used as power for driving the developing roller 32 and other components of cartridge B.

[0796] For example, in Example 1 (see Figure 9 In the process, the developing roller gear 30 is connected to the developing roller 32, so the elastic rotatable member 490 can be connected to the developing roller gear 30.

[0797] However, the flexible rotatable member 490 does not necessarily need to transmit the driving force received from the drive transmission member 81 to another member.

[0798] In this variant, the gear portion 81a of the drive transmission member 81 meshes into the elastic rotatable member 490, which is an elastic body, thus having the advantage that the engagement state between the elastic rotatable member 490 and the drive transmission member 81 is easily stabilized.

[0799] <Example 5>

[0800] Next, we will refer to the following. Figures 56 to 66 Description of Embodiment 5. Specifically, in the elements disclosed in this embodiment, those components corresponding to those described in the previous embodiments will be given the same names as the components in the previous embodiments, and only the differences from the previous embodiments will be described. In the description of this embodiment, reference will be made specifically to Embodiment 2.

[0801] First, refer to Figure 56The box structure of this embodiment is described. Figure 56 This is a perspective view of box B. (Example) Figure 56 As shown, cartridge B in this embodiment includes a cleaning unit 260 and a developing unit 520, as in embodiment 2. The developing unit 520 also has a toothed gear mechanism 590. In this embodiment, the direction along the rotation axis Ax1 of the drum 62 is the longitudinal direction D500, the driving side of the drum flange 263 is the driving side, and the direction toward the driving side is indicated by arrow E50. The side opposite to the driving side is the non-driving side, and the direction toward the non-driving side is indicated by arrow E51.

[0802] <Short-tooth gear mechanism>

[0803] Next, we will refer to Figure 57 Describe the structure of the toothed gear mechanism 590. Figure 57 This is an exploded perspective view of the toothed gear mechanism 590. Figure 57 Part (a) is the view seen from the non-driving side, and Figure 57 Part (b) is the view seen from the drive side.

[0804] In this embodiment, the toothed gear mechanism 590 is disposed on the drive side of the cartridge as part of the structure of the developing unit 520 (see [link]). Figure 59 (a) of the document. For example... Figure 57 As shown, the toothed gear mechanism 590 includes a drive-side developing-side member 526, a toothed gear 591, a push spring 592, a torsion coil spring 594, a rotatable member 295, a support member 596, a pressed member 297, and an initialization spring 298. The various components of the toothed gear mechanism 590 will be described below.

[0805] The drive-side developing-side component 526 includes a shaft support portion 526a, a limiting hole 526b, a hole portion 526d, a spring seat surface 526h, a cut portion 526g, and a guide surface 526i, which are related components of the toothed gear mechanism 590.

[0806] The shaft support portion 526a has a recessed hole in the longitudinal direction D500, and its axis is the rotation axis Ax50. When assembling the toothed gear mechanism 590, the rotation axis Ax2 of the developing roller 32 is coaxial with the rotation axis Ax50 of the shaft support portion 526a.

[0807] The limiting hole 526b is a recessed hole in the longitudinal direction D500, and is an arc-shaped hole coaxial with the rotation axis Ax50. When viewed from the non-drive side parallel to the rotation axis Ax50, the counterclockwise direction around the rotation axis Ax50 is indicated by the rotation direction R50, and the clockwise direction is indicated by the rotation direction R51. The downstream end of the limiting hole 526b in the rotation direction R51 is referred to as the limiting surface 526b1.

[0808] The hole portion 526d, the spring seat surface 526h, the cut portion 526g, and the guide surface 526i are arranged in the same manner as the hole portion 226d, the spring seat surface 226h, the cut portion 226g, and the guide surface 226i in Embodiment 2.

[0809] The toothed gear 591 includes a gear portion 591a, a shaft hole 591b, a small-diameter portion 591c, a large-diameter portion 591d, a pressed portion 591e, a spring hook hole 591f, and a locking protrusion 591g. When assembling the toothed gear mechanism 590, the shaft hole 591b of the toothed gear 591 is coaxial with the rotation axis Ax50, and multiple gear portions 591a are radially distributed outward from the shaft hole 591b. The small-diameter portion 591c is located downstream of the gear portion 591a in the rotation direction R50, and the large-diameter portion 591d is located further downstream. The surface connecting the small-diameter portion 591c and the large-diameter portion 591d is the pressed portion 591e. The toothed gear 591 has a spring hook hole 591f at its downstream end in the direction of arrow E51, and a locking protrusion 591g at its downstream end in the direction of arrow E50.

[0810] The toothed gear 591 has at least one gear tooth. In this embodiment, the toothed gear 591 has multiple gear teeth. The toothed gear 591 of this embodiment is the same as the gear portion 30a of Embodiment 1 (see...). Figure 9 The corresponding part. The toothed gear 591 is at least partially exposed to the outside of the box so as to mesh with the gear portion 81a of the drive transmission member 81. More specifically, the exposed portion of the gear portion 291a faces the side where the axis Ax1 of the drum 62 is located (see...). Figure 56 ).

[0811] The push spring 592 is a torsion coil spring and has an inner diameter portion 592a, a fixed arm 592b protruding toward the arrow E51 side, and an actuating arm 592c protruding in the direction of arrow E50.

[0812] The torsion coil spring 594 includes an actuated arm 594a, an actuating arm 594b, and an inner diameter portion 594c. The state in which no load is applied to the actuated arms 594a and 594b is referred to as the free state. The actuating arm 594b has a radially outwardly extending arm portion 594b1 and an actuating portion 594b2 extending from the free end side of the arm portion 594b1 in the direction of arrow E50. When viewed along direction D500, the side where the actuated arms 594a and 594b are closer to each other from the free state is referred to as the closing direction, and the side where they are further apart is referred to as the opening direction.

[0813] The rotatable member 295 is similar to that of Embodiment 2. In this embodiment, the axis of rotation of the rotatable member 295 is referred to as the axis of rotation Ax51.

[0814] The support member 596 includes a hole portion 596a, a developing roller support hole 596b, a guide surface 596c, and a spring hook hole 596d, and is a member fixed to the driving-side developing-side member 526 during the assembly of the toothed gear mechanism 590. The developing roller support hole 596b is a hole that passes through in the longitudinal direction D500. The spring hook hole 596d is a hole that passes through in the longitudinal direction D500. The hole portion 596a and the guide surface 596c have the same structure as the hole 296a and the guide surface 596c in Embodiment 2.

[0815] The pressed member 297 and the initialization spring 298 have the same structure as in Embodiment 2.

[0816] Assembly of the missing tooth gear mechanism

[0817] Next, we will refer to Figure 58 and Figure 59 The assembly method of the toothed gear mechanism 590 itself and the assembly of the toothed gear mechanism 590 to the developing unit 520 are described. Figure 58 The assembly method of the toothed gear mechanism 590 is shown. This assembly method follows... Figure 58 part (a) and Figure 58 Assemble the parts in the order of (b). Figure 59 The assembled toothed gear mechanism 590 is shown. Figure 59 Part (a) is the view seen in a direction perpendicular to the longitudinal direction. Figure 59 Part (b) is along Figure 59 The cross-sectional view taken by line X503-X503 shown in part (a), and Figure 59 Part (c) is along Figure 59 A cross-sectional view taken from line X504-X504 in part (a).

[0818] First, such as Figure 58 As shown in part (a), a torsion coil spring 594 and a rotatable member 295 are assembled to the drive-side developing-side member 526. For the torsion coil spring 594, the shaft portion 295g of the rotatable member 295 is inserted into the inner diameter portion 594c with the actuated arm 594a in the phase of the gap 295c. The rotatable member 295 is assembled along direction D500 in the direction of arrow E50, and the shaft portion 295g is rotatably supported in the hole portion 526d.

[0819] Next, the pressed component 297 and the initialization spring 298 are assembled, but since this is similar to Embodiment 2, its description will be omitted.

[0820] Next, assemble the toothed gear 591, the compression spring 592, and the support member 596. For example... Figure 58 As shown in part (b), the developing unit 520 includes a developing roller 32. The developing roller support hole 596b of the support member 596, the inner diameter portion 592a of the push spring 592, the shaft hole 591b of the toothed gear 591, and the shaft support portion 526a of the drive-side developing member 526 are sequentially assembled around the support shaft 32a of the developing roller 32. As in Embodiment 2, while the shaft portion 295g of the rotatable member 295 is inserted into the hole portion 596a and the guide surface 296c supports the guided surface 297c of the pressed member 297, the support member 596 is fixed to the drive-side developing member 526 by an adhesive or the like (see [reference]). Figure 27 (part (c)).

[0821] The fixed arm 592b of the push spring 592 is inserted into the spring hook hole 596d of the support member 596, and its actuating arm 592c is inserted into the spring hook hole 591f of the toothed gear 591.

[0822] The toothed gear 591 is rotatably supported by the shaft support portion 526a of the drive-side developing-side member 526, and the locking protrusion 591g is inserted into the limiting hole 526b of the drive-side developing-side member 526. At this time, the push spring 592 is assembled with the actuating arm 592c twisted relative to the fixed arm 592b in the rotational direction R50 to push the toothed gear 591 along the rotational direction R51 with a torque M50. Through this torque M50, as... Figure 59 As shown in part (b), the locking protrusion 591g of the toothed gear 591 abuts against the limiting surface 526b1 of the drive-side developing-side member 526. Furthermore, as... Figure 59 As shown in part (c), the large-diameter portion 591d of the toothed gear 591 is in phase with the actuating portion 594b2 of the torsion coil spring 594 in the radial direction of the rotation axis Ax50.

[0823] After that, as Figure 59 As shown in part (a), the toothed gear mechanism 590 is fixed to the developing unit 520 using screws or the like.

[0824] Through the above process, the toothed gear mechanism 590 is assembled into the developing unit 520.

[0825] Next, refer to Figure 60The extent of the toothed gear 591 in the toothed gear mechanism 590 will be described below. Similar to the developing roller gear 30 in Embodiment 1, the toothed gear 591 is configured to mesh with the gear portion 81a of the drive transmission member 81, as will be described in detail below. Therefore, the preferred position of the toothed gear 591 is the same as the preferred position of the developing roller gear 30.

[0826] The toothed gear 591 is a rotatable component, as will be described in detail below. The following description is based on the assumption that the toothed gear 591 is in its initial position before the housing is installed into the main assembly of the device, that is, the toothed gear 591 is in a position in which it can mesh with the drive transmission member 81.

[0827] Figure 60 The arrangement of the missing tooth gear 591 in the missing tooth gear mechanism 590 is shown. Figure 60 Part (a) is a view seen in a direction perpendicular to the axis of rotation of drum 62, and Figure 60 Part (b) is along Figure 60 A cross-sectional view taken from line X500-X500 in part (a). Figure 60 In part (a), for better illustration, only the drum 62 and the drive-side drum flange 263 are shown for the components constituting the cleaning unit 260. Similarly, Figure 60 Part (b) shows only a portion of the drum 62, developing roller 32, and toothed gear 591. Apart from the arrangement shown in this embodiment, for ease of explanation, Figure 60 Part (b) also shows the missing tooth gear 591 in a state where it is arranged to be shifted in the positive and negative directions at an angle K50, which will be described below, where the positive angle is denoted as angle K50U and the negative angle is denoted as angle K50L.

[0828] The preferred arrangement of the toothed gear 591 corresponds to the preferred arrangement of the developing roller gear 30 described in Example 1 (see...). Figure 1 , Figure 9 and Figure 20 And the suitable arrangement of the rack and pinion 291 described in Embodiment 2 (see Figure 29 (part (b)).

[0829] For example, ideally, at least a portion of the toothed gear 591 is arranged in the longitudinal direction outside the free end 263b1 of the drive-side drum flange 263. Additionally, ideally, the teeth of the toothed gear 591 are exposed facing the drum axis Ax1.

[0830] When observing the box along the rotation axis Ax1, the direction of the straight line extending from the rotation axis Ax1 of the drum 62 through the rotation axis Ax50 of the toothed gear 591 is called direction D501. Direction D501 is perpendicular to the rotation axis Ax1. Along this direction D501, the distance from the axis of the drum 62 to the free end (tooth tip) of the gear tooth of the gear portion 591a is called distance L50. This arrangement ensures that distance L50 is within 90% to 120% of the radius of the drum 62, as in Embodiment 2. Distance L50 is further preferably 90% to 110%, and even more preferably 93% to 107%.

[0831] Furthermore, the straight line extending from the rotation axis Ax1 of the drum 62 and passing through the rotation axis Ax2 of the developing roller 32 is called the reference line, and the angle between the direction D501 and this reference line is angle K50. As mentioned earlier, the downstream direction of the rotation of the drum 62 is set as the positive direction of the angle. In other words, for angle K50, the downstream side of the direction of arrow R, which is the rotation direction of the drum 62, is the positive side relative to the reference line, and the upstream side of the direction of arrow R is the negative side.

[0832] In this case, it is preferable that the toothed gear 591 is configured such that the angle K50 is within the range of -75° to 50°. The preferred range of the angle K50 associated with the toothed gear 591 is the same as that of the angle K20 in Embodiment 2 (see...). Figure 29 The preferred range is the same for part (b).

[0833] Additionally, the angle formed between the straight line extending from the rotation axis Ax1 of the drum 62 and passing through the tooth end 591a1 of the gear portion 591a of the toothed gear 591 and the reference line is angle K51.

[0834] The positive direction of angle K51 is the downstream direction of the rotation of drum 62. That is, angle K51 is positive downstream of the direction of arrow R, which is the direction of rotation of drum 62, and negative upstream of the direction of arrow R. The preferred range of angle K51 is the same as that of angle K21 described in Embodiment 2 (see...). Figure 29 The preferred range is the same for part (b).

[0835] This is the gear portion 81a of the drive transmission component 81 (see...) Figure 13 Preferred conditions for meshing with the gear portion 591a of the toothed gear 591. Furthermore, it is preferred that the angle K51 of at least one tooth of the gear portion 591a of the toothed gear 591 is set within a preferred range.

[0836] In this embodiment, the toothed gear 591 is configured such that the angle K51 is within the range of -35° to 45°.

[0837] Although the toothed gear mechanism 590 is provided in the developing unit 520 in this embodiment, it can be provided in the cleaning unit 260 according to the settings of angle K50, angle K51 and distance L50.

[0838] In this embodiment, the toothed gear 591 is coaxially arranged with the developing roller 32, but it does not have to be coaxial. In this case, the toothed gear 591 is supported by the drive-side developing-side member 526, etc., rather than by the support shaft 32a of the developing roller 32.

[0839] Operation of the missing tooth gear mechanism

[0840] Next, we will refer to Figure 61 Describe the operation of the toothed gear mechanism 590.

[0841] Figure 61 It is along Figure 60 The operation diagram of the toothed gear mechanism 590, shown by line X501-X501 in part (a). Furthermore, Figure 61 Part (a) shows the standby state of the toothed gear mechanism 590, and Figure 61 Part (b) shows the operating state of the toothed gear mechanism 590.

[0842] First, refer to Figure 61 Part (a) describes the standby state (non-operational state) of the toothed gear mechanism 590. In the standby state of the toothed gear mechanism 590, as in Embodiment 2, the pressed member 297 is pushed along the third movable direction D203 in the direction of arrow E25 and is in a first position protruding in the direction of arrow E25. At this time, as in Embodiment 2, the rotatable member 295 is pushed in the rotational direction Q51 about the rotation axis Ax51, and the torsion coil spring 594 is pushed in the rotational direction Q53 about the rotation axis Ax52. At this time, the actuated arm 594a and the actuating arm 594b of the torsion coil spring 594 are in a free state. Then, the actuating portion 594b2 of the torsion coil spring 594 is in a position spaced apart from the large diameter portion 591d of the toothed gear 591 by a gap S50 in the radial direction about the rotation axis Ax50. This state is referred to as the standby state of the toothed gear mechanism 590.

[0843] Next, we will refer to Figure 61 Part (b) describes the operating state of the toothed gear mechanism 590. When the cartridge B is installed in the main assembly A of the image forming apparatus, the pressed member 297 is driven by the abutment portion 15m of the drive side plate 15 in the same manner as in Embodiment 2 (see Figure 31The (a) portion is pressed and moved in the direction of arrow 24. As a result, the rotatable member 295 rotates in the rotational direction Q52 about the rotational axis Ax51. By the rotation of the shaft portion 295g of the rotatable member 295, the actuated arm 594a of the torsion coil spring 594 is pushed in the rotational direction Q54 about the rotational axis Ax53 and is spring-loaded. As a result, the actuating portion 594b2 of the torsion coil spring 594 abuts against the large-diameter portion 591d of the toothed gear 591 and applies a force F50. This state is referred to as the operating state of the toothed gear mechanism 590. Details will be described below, but the operating state is the state in which the torsion coil spring 594 can lock the rotational movement of the toothed gear 591.

[0844] <Install the box to the main assembly of the image forming apparatus>

[0845] Next, we will refer to Figure 62 The operation of mounting cartridge B to the main component A of the image forming apparatus is described in this embodiment. Figure 62 It is along Figure 60 The section (a) shown by line X501-X501 illustrates the installation operation of mounting cartridge B to the main assembly A of the image forming apparatus. Furthermore, Figure 62 Part (a) shows the state before the box is installed, and Figure 62 Part (b) shows the state after the box is installed.

[0846] like Figure 62 As shown in part (a), before the housing B is installed into the main assembly A of the image forming apparatus, the pressed surface 297a of the pressed member 297 faces the abutment portion 15m of the drive side plate 15 constituting the main assembly A of the image forming apparatus. At this time, the toothed gear mechanism 590 is in a standby state. Furthermore, the gear portion 591a of the toothed gear 591 is in a state about to mesh with the gear portion 81a of the drive transmission member 81. In this state, the position of the toothed gear 591 in the housing can be referred to as the initial position, engagement position, operating position, pre-movement position, etc.

[0847] When box B moves from here along the installation direction C, it reaches the state after box B is installed, as follows: Figure 62 As shown in part (b).

[0848] Here, the toothed gear 591, in its initial position, is restricted to rotating in the rotational direction R51 (see...). Figure 59(b) of the drive transmission member 81. Therefore, the gear portion 81a of the drive transmission member 81 and the gear portion 591a of the toothless gear 591 come into contact with each other. At this time, similar to Embodiment 2, the gear portion 81a is tilted in the avoidance direction DW2. Thereafter, the drive transmission member 81 moves by its own weight to engage with the gear portion 591a of the toothless gear 591.

[0849] On the other hand, when cartridge B is installed in the main assembly A of the image forming apparatus, the pressed member 297 is pressed by the abutment portion 15m of the drive side plate 15 to move to the second position. As a result, the toothed gear mechanism 590 is put into operation.

[0850] <Engagement operation of drive transmission component 81>

[0851] Next, we will refer to Figure 63 and Figure 64 The operation of the drive transmission member 81 is described when the drive transmission member 81 is driven and the connecting recess 81b engages with the connecting protrusion 263b of the drive-side drum flange 263. Figure 63 It is along Figure 60 The section shown in part (a) is a cross-sectional view of the operation when the drive transmission member 81 is driven, with line X501-X501 intersecting. Figure 63 Part (a) shows the drive in the tilted state of the drive transmission member 81, and Figure 63 Part (b) shows the state immediately following the alignment of the drive transmission member 81 with the rotation axis Ax1 of the drum 62. Figure 64 It is along Figure 60 The section cut by line X501-X501 in part (a) shows the operation of the toothed gear mechanism 590 after the drive transmission member 81 is aligned with the rotation axis Ax1 of the drum 62. Figure 64 Part (a) shows the process by which the rotation of the toothed gear 591 is limited by the action arm 594b of the torsion coil spring 594, and Figure 64 Part (b) shows the state where movement is restricted.

[0852] like Figure 63As shown in part (a), when the drive transmission member 81 rotates in the rotational direction CW, as in embodiment 2, the gears mesh with each other, and a reaction force FD50, which is a reaction force as the engagement force FD1, is generated in the gear portion 81a. During this stage, the helical gear portion 81a can move in the direction of the engagement reaction force FD50, and therefore not much force is transmitted to the gear portion 591a, making the engagement force FD1 very small. Therefore, the torque M51 acting on the toothed gear 591 by the engagement force FD1 is sufficiently less than the torque M50 generated by the push spring 592, so that the toothed gear 591 does not rotate in the rotational direction R50. The toothed gear 591 maintains its initial position as it did before meshing with the drive transmission member 81.

[0853] Simultaneously, the gear portion 81a of the drive transmission member 81 moves under the reaction force FD50 of the engagement force FD1. When the gear portion 81a moves, the rotation axis Ax3 moves in the same direction as the rotation axis Ax1 of the drum 62.

[0854] Then, as Figure 63 As shown in part (b), the gear part 81a abuts against the limiting part 73j, and the rotation axis Ax3 of the drive transmission member 81 and the rotation axis Ax1 of the drum 62 become substantially coaxial.

[0855] The engagement operation between the connecting protrusion 263b and the connecting recess 81b is the same as in Embodiment 2, and therefore its description will be omitted.

[0856] like Figure 63 As shown in part (b), when the gear portion 81a of the drive transmission member 81 abuts against the limiting portion 73j, or when the connecting recess 81b engages with the connecting protrusion 263b, the movement of the gear portion 81a in any direction other than the rotational direction is restricted. When the movement of the drive transmission member 81 is restricted, force can be fully transmitted from the gear portion 81a to the gear portion 591a of the toothed gear 591. Therefore, when the force received by the gear portion 591a due to the meshing force between the gears at this time is the engagement force FD2, the torque M52 acting on the toothed gear 591 by the engagement force FD2 is greater than the torque M50 applied by the push spring 592. Therefore, the toothed gear 591 rotates from the initial position (engaged position) in the rotational direction R50 by the torque M52.

[0857] When the toothed gear 591 rotates a predetermined amount in the rotation direction R50, such as Figure 64As shown in part (a), the actuating portion 594b2 of the torsion coil spring 594 contacts the pressed portion 591e of the toothed gear 591, and the pressed portion 591e is subjected to a force F50a from the actuating portion 594b2. Here, the torque M53a acting on the toothed gear 591 due to the force F50a is set to be greater than the torque M50a from the pushing spring 592. Therefore, the actuating arm 594b of the spring-loaded torsion coil spring 594 rotates in the rotation direction Q24 about the rotation axis Ax53. Then, as... Figure 64 As shown in part (b), the actuating part 594b2 approaches the rotation axis Ax50 of the toothed gear 591 and contacts the small diameter part 591c, thereby stopping its rotation. During this period, the toothed gear 591 rotates in the rotation direction R50.

[0858] When the toothed gear 591 rotates in the rotation direction R50, the gear portion 591a disengages from the gear portion 81a of the drive transmission member 81. In this state, the pressed portion 591e of the toothed gear 591 receives a torque M53b from the actuating portion 594b2 of the torsion coil spring 594. Here, the torque M53b is set to be equal to or greater than the torque M50b from the push spring 592. As a result, the rotation of the toothed gear 591 in the rotation direction R51 is limited by the actuating portion 591b2 of the torsion coil spring 594. In other words, the gear portion 591a is held in its disengaged state from the gear portion 81a of the drive transmission member 81. The position of the toothed gear 591 in the housing at this time will be referred to as the retracted position, the disengaged position, the moved position, etc.

[0859] When the missing tooth gear 591 moves from the initial position (engaged position) to the retracted position (disengaged position), it is locked by the torsion coil spring 594. The torsion coil spring 594 is a locking member configured to lock the movement of the missing tooth gear 591.

[0860] <Disassembly Box>

[0861] Next, we will refer to Figure 65 Describe the disassembly operation of disassembly box B from the main component A of the image forming apparatus. Figure 65 It is along Figure 60 The section shown in part (a) is a cross-sectional view of the disassembly operation of box B, taken by line X502-X502. Figure 65 Part (a) to Figure 65 Section (c) illustrates the process. Figure 65 In part (b), unnecessary parts are not shown for better illustration, and the toothed gear mechanism 590 and its surrounding area are shown in an enlarged manner.

[0862] like Figure 65As shown in part (a), box B is moved in the opposite direction to the mounting direction C in order to disassemble it. At this time, as... Figure 65 As shown in part (b), similar to embodiment 2, the pressed surface 297a of the pressed member 297 is spaced apart from the abutting portion 15m of the drive side plate 15, and the pressed member 297 is moved to a first position by the initialization spring 298.

[0863] The rotatable member 295 rotates in the rotational direction Q51 about the rotational axis Ax51. At this time, the torsion spring 594 returns ...

Claims

1. A box, comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis; as well as A rack having one or more teeth at least partially exposed to face the axis of the photosensitive drum, and disposed on the side of the housing relative to the axis of the photosensitive drum.

2. The housing according to claim 1, further comprising a coupling configured to transmit driving force to the photosensitive drum, the coupling being disposed at an end of the photosensitive drum and on the side of the housing.

3. The cartridge of claim 2, wherein the end of the photosensitive drum is a first end, the photosensitive drum has a second end opposite to the first end, and when measured along the axis of the photosensitive drum, the one or more teeth are at least partially positioned further away from the second end of the photosensitive drum than the free end of the coupling.

4. The cartridge according to any one of claims 1 to 3, wherein the rack is positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the end of a tooth among the one or more racks is more than 90% and less than 120% of the radius of the photosensitive drum.

5. The box according to any one of claims 1 to 4, further comprising a movable member disposed on the side of the box, wherein the movable member is movable to change the distance from the surface of the movable member to the axis of the photosensitive drum.

6. The cartridge of claim 5, wherein, when viewed along the axis of the photosensitive drum, the movable member is capable of assuming a position such that at least a portion of the photosensitive drum is between the surface of the movable member and the rack.

7. The cartridge according to claim 5 or 6, wherein the photosensitive drum has a first end and a second end opposite to the first end. The housing also includes a coupling configured to transmit driving force to the photosensitive drum, the coupling being located at a first end of the photosensitive drum and on the side of the housing. The movable member is positioned such that, when measured along the axis of the photosensitive drum, at least a portion of the surface of the movable member is further away from the second end of the photosensitive drum than the free end of the coupling.

8. The box according to any one of claims 5 to 7, The movable member is positioned such that, when viewed along the axial direction of the photosensitive drum, the surface of the movable member is adjacent to the circumferential surface of the photosensitive drum.

9. The box according to any one of claims 5 to 8, The movable member is positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is less than 1.2 times the radius of the photosensitive drum.

10. The box according to any one of claims 5 to 9, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is greater than 1.25 times the radius of the photosensitive drum.

11. The box according to any one of claims 1 to 10, wherein the rack has a plurality of teeth and the rack is configured to move along a straight line or plane in contact with the ends of the teeth.

12. The cartridge according to any one of claims 1 to 11, wherein the rack has a plurality of teeth, and the distance from the axis of the photosensitive drum to a line passing through the end of the teeth, measured along a direction perpendicular to the axis of the photosensitive drum, is more than 90% and less than 120% of the radius of the photosensitive drum.

13. The cartridge according to any one of claims 1 to 12, wherein the rack is capable of being positioned such that, when viewed along the axis of the photosensitive drum, a line extending in a direction perpendicular to the direction in which the rack moves away from the photosensitive drum forms an angle of -75° to 50° or more, or 130° to 190° to 1, relative to a line extending from the axis of the photosensitive drum to pass through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

14. The cartridge according to any one of claims 1 to 13, wherein the rack is capable of being positioned such that, when viewed along the axis of the photosensitive drum, A line extending from the axis of the photosensitive drum through one of the one or more teeth forms an angle of -75° to 50° or 130° to 190° relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

15. The box according to any one of claims 1 to 14, wherein the rack is movable between a first position and a second position, and the box further includes a locking element configured to restrict the movement of the rack between the first position and the second position.

16. The box of claim 15, wherein the rack is pushed toward the first position.

17. The box of claim 15, wherein the locking member is configured to restrict movement of the rack when the rack is in the second position.

18. The box according to any one of claims 15 to 17, wherein the locking member is configured to switch between an operating state and a non-operating state, wherein in the operating state the locking member is capable of restricting the movement of the locking member, and in the non-operating state the locking member does not restrict the movement of the rack.

19. The box of claim 18, further comprising an operating portion configured to switch the locking member between the operating state and the non-operating state.

20. The cartridge according to any one of claims 1 to 18, further comprising a movable member located on the side of the cartridge, wherein the movable member is movable such that the distance from the surface of the movable member to the axis of the photosensitive drum changes.

21. The cartridge of claim 20, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, at least a portion of the photosensitive drum is between the surface of the movable member and the surface of the rack.

22. The cartridge according to claim 20 or 21, wherein the photosensitive drum has a first end and a second end opposite to the first end. The housing also includes a coupling configured to transmit driving force to the photosensitive drum, the coupling being located at a first end of the photosensitive drum and on the side of the housing. The movable member is positioned such that, when measured along the axis of the photosensitive drum, at least a portion of the surface of the movable member is further away from the second end of the photosensitive drum than the free end of the coupling.

23. The cartridge according to any one of claims 20 to 22, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, the surface of the movable member is adjacent to the circumferential surface of the photosensitive drum.

24. The box according to any one of claims 20 to 23, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is less than 1.2 times the radius of the photosensitive drum.

25. The box according to any one of claims 20 to 24, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is greater than 1.25 times the radius of the photosensitive drum.

26. A box, comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis; as well as An elastic member having a surface at least partially exposed in a manner facing the axis of the photosensitive drum, the elastic member being disposed on the side of the cartridge relative to the axis of the photosensitive drum.

27. The box according to claim 26, wherein the elastic member is movable.

28. The box according to claim 26 or 27, wherein the elastic member is movable along the surface.

29. The box according to any one of claims 26 to 28, wherein the elastic member is rotatable about its axis.

30. The cartridge according to any one of claims 26 to 29, wherein the elastic member is movable in a manner that changes the distance from the axis of the photosensitive drum to the surface of the elastic member.

31. The box of claim 26, further comprising a movable rod, the elastic member disposed on the rod.

32. The box according to any one of claims 26 to 31, further comprising a locking element configured to restrict movement of the resilient member.

33. The box according to claim 32, wherein the locking member is switchable between an operating state and a non-operating state, wherein in the operating state the locking member restricts the movement of the elastic member, and in the non-operating state the locking member does not restrict the movement of the elastic member.

34. The box of claim 33, further comprising an operating portion configured to switch the locking member between the operating state and the non-operating state.

35. The box according to any one of claims 32 to 34, further comprising a spring for pressing the elastic member.

36. The box of claim 35, wherein the elastic member is movable between a first position and a second position, and the elastic member is pushed toward the first position.

37. The box according to any one of claims 32 to 36, wherein the locking member is configured to restrict movement of the resilient member when the resilient member is in the second position.

38. The cartridge according to any one of claims 26 to 37, further comprising a coupling configured to transmit driving force to the photosensitive drum, the coupling being located at an end of the photosensitive drum and at the side of the cartridge.

39. The cartridge according to any one of claims 26 to 38, wherein the end of the photosensitive drum is a first end, the photosensitive drum has a second end opposite to the first end, and when measured along the axis of the photosensitive drum, at least a portion of the surface of the elastic member is further away from the second end of the photosensitive drum than the free end of the coupling.

40. The cartridge according to any one of claims 26 to 39, wherein the resilient member is positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the surface of the resilient member is more than 75% and less than 120% of the radius of the photosensitive drum.

41. The cartridge according to any one of claims 26 to 40, further comprising a movable member disposed on the side of the cartridge, the movable member being movable to change the distance from the surface of the movable member to the axis of the photosensitive drum.

42. The box according to claim 41, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, at least a portion of the photosensitive drum is between the surface of the movable member and the surface of the elastic member.

43. The cartridge according to any one of claims 41 to 42, wherein the photosensitive drum has a first end and a second end opposite to the first end. The housing also includes a coupling configured to transmit driving force to the photosensitive drum, the coupling being disposed at a first end of the photosensitive drum and on the side of the housing, and The movable member is positioned such that, when measured along the axis of the photosensitive drum, at least a portion of the surface of the movable member is further away from the second end of the photosensitive drum than the free end of the coupling.

44. The cartridge according to any one of claims 41 to 43, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, the surface of the movable member is adjacent to the circumferential surface of the photosensitive drum.

45. The box according to any one of claims 41 to 44, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is less than 1.2 times the radius of the photosensitive drum.

46. ​​The box according to any one of claims 41 to 45, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is greater than 1.25 times the radius of the photosensitive drum.

47. The cartridge according to any one of claims 26 to 46, wherein, when viewed along the axis of the photosensitive drum, a line extending from the axis of the photosensitive drum through the surface of the elastic member forms an angle of -70° or more and 100° or less, or 130° or more and 190° or less, relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

48. A box comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis; as well as The friction-applying portion has a surface that is at least partially exposed in a manner facing the axis of the photosensitive drum, and is disposed on the side of the cartridge in a direction relative to the axis of the photosensitive drum.

49. The box according to claim 48, wherein the friction-applying portion is movable.

50. The cartridge according to claim 48 or 49, wherein the friction-applying portion is movable in a manner that changes the distance from the axis of the photosensitive drum to the surface of the friction-applying portion.

51. The box according to any one of claims 48 to 50, further comprising a movable rod, wherein the friction-applying portion is disposed on the rod.

52. The cartridge according to any one of claims 48 to 51, further comprising a coupling configured to transmit driving force to the photosensitive drum, and disposed at an end of the photosensitive drum and on the side of the cartridge.

53. The cartridge of claim 52, wherein the end of the photosensitive drum is a first end, the photosensitive drum has a second end opposite to the first end, and when measured along the axis of the photosensitive drum, at least a portion of the surface of the friction-applying portion is further away from the second end of the photosensitive drum than the free end of the coupling.

54. The cartridge according to any one of claims 48 to 53, wherein the friction-applying portion is positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the surface of the friction-applying portion is more than 75% and less than 120% of the radius of the photosensitive drum.

55. The box according to any one of claims 48 to 54, wherein the coefficient of friction of the frictional force-applying portion is higher than the coefficient of friction of the externally exposed portion of the frame.

56. The cartridge according to any one of claims 48 to 55, further comprising a movable member disposed on the side of the cartridge, the movable member being movable to change the distance from the surface of the movable member to the axis of the photosensitive drum.

57. The cartridge of claim 56, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, at least a portion of the photosensitive drum is positioned between the surface of the movable member and the surface of the friction-applying portion.

58. The cartridge according to claim 56 or 57, wherein the photosensitive drum has a first end and a second end opposite to the first end. The housing also includes a connector configured to transmit driving force to the photosensitive drum, the connector being disposed at a first end of the photosensitive drum and on the side of the housing. The movable member is positioned such that, when measured along the axis of the photosensitive drum, at least a portion of the surface of the movable member is further away from the second end of the photosensitive drum than the free end of the coupling.

59. The cartridge according to any one of claims 56 to 58, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, the surface of the movable member is adjacent to the circumferential surface of the photosensitive drum.

60. The box according to any one of claims 56 to 59, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is less than 1.2 times the radius of the photosensitive drum.

61. The box according to any one of claims 56 to 60, wherein the movable member is capable of taking a position such that the distance from the surface of the movable member to the axis of the photosensitive drum is greater than 1.25 times the radius of the photosensitive drum.

62. The cartridge according to any one of claims 48 to 61, wherein, when viewed along the axis of the photosensitive drum, a line extending from the axis of the photosensitive drum through the surface of the friction-applying portion forms an angle of -70° or more and 100° or less, or 130° or more and 190° or less, relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

63. The cartridge according to any one of claims 48 to 62, wherein, when viewed along the axis of the photosensitive drum, the normal to the surface of the friction-applying portion extending away from the axis of the photosensitive drum forms an angle of -70° to 100° or more, or 130° to 190° to 1, when viewed along the axis of the photosensitive drum. The downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

64. The box according to any one of claims 48 to 63, wherein the friction-applying portion is an elastic member.

65. The box according to any one of claims 48 to 63, wherein the friction-applying portion is an abrasive material.

66. The box according to any one of claims 48 to 63, wherein the friction-applying portion is an adhesive member having a sticky nature.

67. A box comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis; as well as An adhesive member having a surface at least partially exposed in a manner facing the axis of the photosensitive drum, and disposed on the side of the cartridge in a direction relative to the axis of the photosensitive drum.

68. The box according to claim 67, wherein the adhesive member is movable.

69. The cartridge according to claim 67 or 68, wherein the adhesive member is movable in a manner that changes the distance from the axis of the photosensitive drum to the surface of the adhesive member.

70. The box according to any one of claims 67 to 69, further comprising a movable rod, the adhesive member disposed on the rod.

71. The cartridge according to any one of claims 67 to 70, further comprising a coupling configured to transmit driving force to the photosensitive drum, the coupling being disposed at an end of the photosensitive drum and on the side of the cartridge.

72. The cartridge of claim 71, wherein the end of the photosensitive drum is a first end, the photosensitive drum has a second end opposite to the first end, and when measured along the axis of the photosensitive drum, at least a portion of the surface of the adhesive member is further away from the second end of the photosensitive drum than the free end of the coupling.

73. The cartridge according to any one of claims 67 to 72, wherein the adhesive member is positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the surface of the adhesive member is more than 75% and more than 120% of the radius of the photosensitive drum.

74. The cartridge according to any one of claims 67 to 73, further comprising a movable member disposed on the side of the cartridge, the movable member being movable to change the distance from the surface of the movable member to the axis of the photosensitive drum.

75. The cartridge of claim 74, wherein the movable member is positioned such that, when viewed along the axis of the photosensitive drum, at least a portion of the photosensitive drum is between the surface of the movable member and the surface of the adhesive member.

76. The cartridge according to claim 74 or 75, wherein the photosensitive drum has a first end and a second end opposite to the first end. The housing also includes a connector configured to transmit driving force to the photosensitive drum, the connector being disposed at a first end of the photosensitive drum and on the side of the housing. The movable member is positioned such that, when measured along the axis of the photosensitive drum, at least a portion of the surface of the movable member is further away from the second end of the photosensitive drum than the free end of the coupling.

77. The cartridge according to any one of claims 74 to 76, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, the surface of the movable member is adjacent to the circumferential surface of the photosensitive drum.

78. The box according to any one of claims 74 to 77, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is less than 1.2 times the radius of the photosensitive drum.

79. The box according to any one of claims 74 to 78, wherein the movable member is capable of taking a position such that the distance from the surface of the movable member to the axis of the photosensitive drum is greater than 1.25 times the radius of the photosensitive drum.

80. The cartridge according to any one of claims 67 to 79, wherein, when viewed along the axis of the photosensitive drum, a line extending from the axis of the photosensitive drum through the surface of the adhesive member forms an angle of -70° or more and 100° or less, or 130° or more and 190° or less, relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

81. The box according to any one of claims 67 to 80, wherein, When viewed along the axis of the photosensitive drum, the normal to the surface of the adhesive member extending away from the axis of the photosensitive drum forms an angle of -70° to 100° or 130° to 190° with a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

82. A box, comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about its axis; One or more movable teeth are disposed on the side of the cartridge with respect to the axis of the photosensitive drum and are at least partially exposed in a manner facing the axis of the photosensitive drum; as well as A locking element for restricting the movement of the one or more teeth.

83. The box of claim 82, wherein the locking member is switchable between an operating state capable of restricting the movement of the one or more teeth and a non-operating state not restricting the movement of the one or more teeth.

84. The box of claim 83, further comprising an operating portion configured to switch the locking member between the operating state and the non-operating state.

85. The box according to claim 82 or 83, further comprising a spring for pressing the one or more teeth.

86. The box according to any one of claims 82 to 85, wherein the one or more teeth are movable between a first position and a second position and are pushed toward the first position.

87. The box of claim 86, wherein the locking member is configured to restrict movement of the one or more teeth when the one or more teeth are in the second position.

88. The box of claim 86, wherein the locking member is configured to restrict movement of the one or more teeth when the one or more teeth are in the first position.

89. The box according to any one of claims 82 to 88, further comprising a gear having said one or more teeth.

90. The box according to claim 89, wherein the gear is a rack and pinion gear.

91. The box according to claim 89, wherein the gear is rotatable about its axis.

92. The box according to claim 89, wherein the gear is a toothed gear.

93. The cartridge according to any one of claims 82 to 92, further comprising a coupling configured to transmit driving force to the photosensitive drum, the coupling being disposed at an end of the photosensitive drum and on the side of the cartridge.

94. The cartridge of claim 93, wherein the end of the photosensitive drum is a first end, the photosensitive drum has a second end opposite to the first end, and when measured along the axis of the photosensitive drum, at least a portion of the one or more teeth is further away from the second end of the photosensitive drum than the free end of the coupling.

95. The cartridge according to any one of claims 82 to 94, wherein the one or more teeth are capable of being positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the free end of the one or more teeth is more than 90% and less than 120% of the radius of the photosensitive drum.

96. The cartridge according to any one of claims 82 to 95, further comprising a movable member disposed on the side of the cartridge, the movable member being movable to change the distance from the surface of the movable member to the axis of the photosensitive drum.

97. The housing of claim 96, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, at least a portion of the photosensitive drum is between the surface of the movable member and the gear.

98. The cartridge according to claim 96 or 97, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, at least a portion of the photosensitive drum is between the surface of the movable member and the surface of the elastic member.

99. The cartridge according to any one of claims 96 to 98, wherein the photosensitive drum has a first end and a second end opposite to the first end. The housing also includes a connector configured to transmit driving force to the photosensitive drum, the connector being disposed at a first end of the photosensitive drum and on the side of the housing. The movable member is positioned such that, when measured along the axis of the photosensitive drum, at least a portion of the surface of the movable member is further away from the second end of the photosensitive drum than the free end of the coupling.

100. The cartridge according to any one of claims 96 to 99, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, the surface of the movable member is adjacent to the circumferential surface of the photosensitive drum.

101. The box according to any one of claims 96 to 100, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is less than 1.2 times the radius of the photosensitive drum.

102. The box according to any one of claims 96 to 101, wherein the movable member is capable of taking a position such that the distance from the surface of the movable member to the axis of the photosensitive drum is greater than 1.25 times the radius of the photosensitive drum.

103. The cartridge according to any one of claims 82 to 102, wherein, when viewed along the axis of the photosensitive drum, a line extending from the axis of the photosensitive drum through the teeth of the one or more teeth forms an angle of -75° or more and 50° or less, or 130° or more and 190° or less, relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

104. A box, comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis; as well as A rotatable toothed gear, the toothed gear being disposed on the side of the housing and having one or more teeth that are at least partially exposed in a manner facing the axis of the photosensitive drum.

105. The housing of claim 104, further comprising a coupling configured to transmit driving force to the photosensitive drum, the coupling being disposed at an end of the photosensitive drum and on the side of the housing.

106. The cartridge of claim 105, wherein the end of the photosensitive drum is a first end, the photosensitive drum having a second end opposite to the first end, wherein, when measured along the axis of the photosensitive drum, at least a portion of the one or more teeth is further away from the second end of the photosensitive drum than the free end of the coupling.

107. The cartridge according to any one of claims 104 to 106, wherein the toothed gear is positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the end of a tooth among the one or more teeth is more than 90% and less than 120% of the radius of the photosensitive drum.

108. The box according to any one of claims 104 to 107, further comprising a movable member disposed on the side of the box, The movable member is movable such that the distance from the surface of the movable member to the axis of the photosensitive drum changes.

109. The box according to claim 108, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, at least a portion of the photosensitive drum is between the surface of the movable member and the toothed gear.

110. The cartridge according to claim 108 or 109, wherein the photosensitive drum has a first end and a second end opposite to the first end. The housing also includes a connector configured to transmit driving force to the photosensitive drum, the connector being disposed at a first end of the photosensitive drum and on the side of the housing. The movable member is positioned such that, when measured along the axis of the photosensitive drum, at least a portion of the surface of the movable member is further away from the second end of the photosensitive drum than the free end of the coupling.

111. The cartridge of claim 110, wherein the movable member is positioned such that, when viewed along the axis of the photosensitive drum, the surface of the movable member is adjacent to the circumferential surface of the photosensitive drum.

112. The box according to any one of claims 108 to 111, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is less than 1.2 times the radius of the photosensitive drum.

113. The box according to any one of claims 108 to 112, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is greater than 1.25 times the radius of the photosensitive drum.

114. The cartridge according to any one of claims 104 to 113, wherein, when viewed along the axis of the photosensitive drum, a line extending from the axis of the photosensitive drum through the axis of the toothed gear forms an angle of -75° or more and +50° or less, or 130° or more and 190° or less, relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

115. The box according to any one of claims 104 to 114, wherein the toothed gear is rotatable between a first position and a second position. The box also includes a locking element configured to restrict movement of the missing tooth gear between the first position and the second position.

116. The box of claim 115, wherein the toothed gear is pushed toward the first position.

117. The box of claim 115, wherein the locking member is configured to restrict movement of the missing tooth gear when the missing tooth gear is in the second position.

118. The box of claim 115, wherein the locking member is configured to restrict movement of the missing tooth gear when the missing tooth gear is in the first position.

119. The box according to any one of claims 115 to 118, wherein the locking member is switchable between an operating state and a non-operating state, wherein in the operating state the movement of the missing tooth gear is restricted, and in the non-operating state the movement of the missing tooth gear is not restricted.

120. The box according to any one of claims 115 to 119, further comprising an operating portion for switching the locking member between the operating state and the non-operating state.

121. The box according to any one of claims 115 to 120, wherein the locking state of the locking member is released by rotation of the toothed gear.

122. The box according to any one of claims 104 to 121, wherein the toothed gear is movable in the direction of its own axis.

123. A box, comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis, has a first end and a second end opposite to the first end; as well as One or more movable teeth, the one or more teeth being disposed on the side of the cartridge with respect to the axis of the photosensitive drum and being at least partially exposed toward the axis of the photosensitive drum; A spring that pushes against one or more teeth; When viewed along the axis of the photosensitive drum, A line extending from the axis of the photosensitive drum through one or more teeth forms an angle of -75° to 50° or 130° to 190° relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

124. The box of claim 123, further comprising a gear having said one or more teeth.

125. The box of claim 124, wherein the spring pushes the one or more teeth via the gear.

126. The box according to any one of claims 123 to 125, further comprising a movable rod provided with one or more of the teeth.

127. The box of claim 126, wherein the spring pushes the one or more teeth via the rod.

128. The cartridge according to any one of claims 123 to 127, further comprising a coupling disposed at an end of the photosensitive drum and configured to transmit a driving force to the photosensitive drum.

129. The cartridge of claim 128, wherein the end of the photosensitive drum is a first end, and the photosensitive drum has a second end opposite to the first end, and the one or more teeth, when measured along the axis of the photosensitive drum, are at least partially farther from the second end of the photosensitive drum than the free end of the coupling.

130. The cartridge according to any one of claims 123 to 129, wherein the one or more teeth are capable of being positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the end of one or more teeth is more than 90% and less than 120% of the radius of the photosensitive drum.

131. A box, comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis; One or more teeth are disposed on the side of the cartridge with respect to the axis of the photosensitive drum and are at least partially exposed toward the axis of the photosensitive drum; as well as A movable rod, the rod being provided with one or more teeth; When viewed along the axis of the photosensitive drum, A line extending from the axis of the photosensitive drum through one or more teeth forms an angle of -75° to 50° or 130° to 190° relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of the rotation of the photosensitive drum is the positive direction of the angle.

132. The housing of claim 131, further comprising a coupling configured to transmit driving force to the photosensitive drum, the coupling being disposed at an end of the photosensitive drum and on the side of the housing.

133. The cartridge of claim 132, wherein the end of the photosensitive drum is a first end, the photosensitive drum has a second end opposite to the first end, and when measured along the axis of the photosensitive drum, the one or more teeth are oriented to be at least partially further away from the second end of the photosensitive drum than the free end of the coupling.

134. The box according to any one of claims 131 to 133, wherein the one or more teeth are movable between a first position and a second position. The box also includes a locking element for restricting the movement of the one or more teeth between the first position and the second position.

135. The box of claim 134, wherein one or more teeth are pushed toward the first position.

136. The box according to claim 134 or 135, wherein the locking member is configured to restrict movement of the rack when one or more teeth are in the second position.

137. The box according to claim 134 or 135, wherein the locking member is configured to restrict movement of the rack when the one or more teeth are in the first position.

138. The box according to any one of claims 131 to 137, further comprising an operating portion for switching between an operating state and a non-operating state, wherein in the operating state the locking member is capable of restricting the movement of the one or more teeth, and in the non-operating state the locking member does not restrict the movement of the one or more teeth.

139. The cartridge according to any one of claims 131 to 138, wherein the one or more teeth are capable of being positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the end of one or more teeth is more than 90% and less than 120% of the radius of the photosensitive drum.

140. The box according to any one of claims 131 to 139, wherein one or more teeth are fixed to the rod.

141. The box according to any one of claims 131 to 140, wherein the free end of the rod is a tooth.

142. The cartridge according to any one of claims 131 to 141, wherein the one or more teeth are movable in the direction of the axis of the photosensitive drum.

143. The cartridge according to any one of claims 131 to 142, wherein the one or more teeth are movable such that the distance from the axis of the photosensitive drum to the one or more teeth changes.

144. A box, comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis, has a first end and a second end opposite to the first end; as well as A rotatable gear is disposed on the side of the housing in a direction relative to the axis of the photosensitive drum. The rotatable gear has one or more teeth that are at least partially exposed toward the axis of the photosensitive drum, and the rotatable gear is movable in the direction of its own axis.

145. The cartridge of claim 144, wherein, when viewed along the axis of the photosensitive drum, a line extending from the axis of the photosensitive drum through one or more teeth forms an angle of -75° to 50° or more, or 130° to 190° or more, relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of rotation of the photosensitive drum is the positive direction of the angle.

146. The box according to claim 144 or 145, further comprising a spring for pressing the gear.

147. The box of claim 146, wherein the spring pushes the one or more teeth via the gear.

148. The box according to any one of claims 144 to 147, further comprising a locking element for restricting movement of the gear.

149. The box according to claim 148, wherein the locking state of the gear by the locking member is released by rotation of the gear.

150. The cartridge according to any one of claims 144 to 149, further comprising a coupling disposed at an end of the photosensitive drum and configured to transmit a driving force to the photosensitive drum.

151. The cartridge of claim 150, wherein the end of the photosensitive drum is a first end, the photosensitive drum has a second end opposite to the first end, and the gear is capable of assuming a position such that, when measured along the axis of the photosensitive drum, the one or more teeth are at least partially further away from the second end of the photosensitive drum than the free end of the coupling.

152. The cartridge according to any one of claims 144 to 151, wherein the one or more teeth are capable of being positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the end of one or more teeth is more than 90% and less than 120% of the radius of the photosensitive drum.

153. A box, comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis; as well as A rotatable gear having one or more teeth at least partially exposed toward the axis of the photosensitive drum, the rotatable gear being disposed on the side of the cartridge relative to the axis of the photosensitive drum. The frame and the gear each have a hole, and the other has a shaft portion fitted into the hole, with a gap between the hole and the shaft portion that allows the gear to move in a direction perpendicular to its own axis.

154. The cartridge of claim 153 further includes a coupling configured to transmit driving force to the photosensitive drum and disposed at an end of the photosensitive drum.

155. The cartridge of claim 154, wherein the end of the photosensitive drum is a first end, the photosensitive drum has a second end opposite to the first end, and when measured along the axis of the photosensitive drum, the one or more teeth are at least partially farther away from the second end of the photosensitive drum than the free end of the coupling.

156. The cartridge according to any one of claims 153 to 155, wherein the gear is capable of being positioned such that, when viewed along the axis of the photosensitive drum, a line extending from the axis of the photosensitive drum through one or more of the teeth forms an angle of -75° to 50° or more, or 130° to 190° relative to a line extending from the axis of the photosensitive drum through the axis of the developing roller, wherein the downstream direction of rotation of the photosensitive drum is the positive direction of the angle.

157. The cartridge according to any one of claims 153 to 156, wherein the gear is capable of being positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the end of a tooth among the one or more teeth is more than 90% and less than 120% of the radius of the photosensitive drum.

158. A box, comprising: frame; A photosensitive drum, which is supported by the frame and is rotatable about an axis; as well as A rotatable belt is disposed on the side of the cartridge in a direction relative to the axis of the photosensitive drum, the belt having a surface that is at least partially exposed to the outside in a manner facing the axis of the photosensitive drum.

159. The cartridge of claim 158, further comprising a coupling configured to transmit driving force to the photosensitive drum, the coupling being disposed at an end of the photosensitive drum and on the side of the cartridge.

160. The cartridge of claim 159, wherein the end of the photosensitive drum is a first end, the photosensitive drum has a second end opposite to the first end, and when measured along the axis of the photosensitive drum, at least a portion of the surface of the strip is further away from the second end of the photosensitive drum than the free end of the coupling.

161. The box according to any one of claims 158 to 160, wherein the strap is an elastic member.

162. The box according to any one of claims 158 to 161, wherein, The belt has one or more teeth on its surface.

163. The cartridge according to any one of claims 158 to 162, wherein the tape is positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the surface of the tape is more than 75% and less than 120% of the radius of the photosensitive drum.

164. The cartridge according to any one of claims 158 to 163, wherein the tape is positioned such that, when measured along a direction perpendicular to the axis of the photosensitive drum, the distance from the axis of the photosensitive drum to the surface of the tape is more than 90% and less than 120% of the radius of the photosensitive drum.

165. The cartridge according to any one of claims 158 to 164, further comprising a movable member disposed on the side, wherein the movable member is movable such that the distance from the surface of the movable member to the axis of the photosensitive drum changes.

166. The cartridge of claim 165, wherein, when viewed along the axis of the photosensitive drum, the movable member is capable of assuming a position such that at least a portion of the photosensitive drum is between the surface of the movable member and the strip.

167. The cartridge according to claim 165 or 166, wherein the photosensitive drum has a first end and a second end opposite to the first end. The housing also includes a connector configured to transmit driving force to the photosensitive drum, the connector being disposed at a first end of the photosensitive drum and positioned on a side of the housing relative to the axis of the photosensitive drum. The movable member is positioned such that, when measured along the axis of the photosensitive drum, at least a portion of the surface of the movable member is further away from the second end of the photosensitive drum than the free end of the coupling.

168. The cartridge according to any one of claims 165 to 167, wherein the movable member is capable of being positioned such that, when viewed along the axis of the photosensitive drum, the surface of the movable member is adjacent to the circumferential surface of the photosensitive drum.

169. The box according to any one of claims 165 to 168, wherein the movable member is capable of taking a position such that the distance from the surface of the movable member to the axis of the photosensitive drum is less than 1.2 times the radius of the photosensitive drum.

170. The box according to any one of claims 165 to 169, wherein the movable member is capable of being positioned such that the distance from the surface of the movable member to the axis of the photosensitive drum is greater than 1.25 times the radius of the photosensitive drum.

171. The cartridge according to any one of claims 158 to 170, wherein the belt is positioned such that, when viewed along the axis of the photosensitive drum, a line extending through the surface of the belt from the axis of the photosensitive drum forms an angle of -70° to 100° or more, or 130° to 190° or more, with a line extending through the axis of the developing roller from the axis of the photosensitive drum, wherein the downstream direction of rotation of the photosensitive drum is the positive direction of the angle.

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