Processing box

Abstract

A process cartridge includes: a developing roller; the developing coupler comprises a driving head and a driving gear, the driving head is used for receiving driving force of the image forming device, and the driving gear is used for driving the developing roller to rotate; the driving head and the driving gear are coaxially arranged and can rotate relative to each other; the movable part is provided with an extending position and a retracting position; when rotating along with the driving head, the movable part can move to the extending position under the action of centrifugal force so as to abut against the driving gear, and then the driving gear is driven to rotate along with the movable part. And the movable part can move to the retraction position when the centrifugal force is weakened or disappears and is separated from the driving gear, so that the driving gear does not receive the driving force of the driving head. Only when the rotating speed of the driving head reaches a certain speed, enough centrifugal force is generated on the movable part to enable the movable part to move to the extending position, transmission is formed with the driving gear, the developing roller is driven to rotate, the working time of the developing roller is shortened, abrasion is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of electronic imaging equipment, in particular to a processing box. Background Art

[0002] The process cartridge is an important component in the development process of the image forming device, and the process cartridge is detachably installed in a mounting chamber of the image forming device.

[0003] In the prior art, the developing roller on the processing box obtains the driving force from the image forming device through the developing coupling, and the driving force of the image forming device is directly transmitted to the developing roller through the developing coupling. As long as the image forming device outputs the driving force, the developing roller must rotate synchronously. In this way, the rotation time of the developing roller is relatively long, which is easy to cause wear and tear, and the service life is reduced.

[0004] In addition, the long-term contact and friction between the photosensitive drum and the developing roller of the processing box will accelerate the deterioration of the developing roller and / or carbon powder. In order to solve the above technical problems, it is necessary to set a corresponding structure to realize the switching between the contact and separation states of the developing roller and the photosensitive drum. In the prior art, the developing roller and the photosensitive drum of the processing box need to perform a drum-roller separation operation according to the instructions of the image forming device. For example, a separation force receiving part is set on the processing box, and the separation force receiving part can move between two positions, so that the developing roller and the photosensitive drum are separated by receiving the separation force from the image forming device. However, the above structure is relatively complicated, and in order to meet the image forming device's high precision requirements for the time and stability of the separation and contact between the developing roller and the photosensitive drum, the accuracy, material strength and matching tolerance of each part are required to be high, otherwise it will affect the development quality of the processing box, and the overall structure of the processing box is relatively large due to the separation receiving part. Utility Model Content

[0005] The processing box of the utility model can effectively solve the above problems.

[0006] According to one aspect of the utility model, there is provided a process cartridge which is detachably mounted on an image forming device, comprising:

[0007] Developing roller;

[0008] A developing coupling, comprising a driving head and a driving gear, wherein the driving head is used to receive a driving force of the image forming device, and the driving gear is used to drive the developing roller to rotate; the driving head and the driving gear are coaxially arranged and can rotate relative to each other;

[0009] The movable part is arranged to have an extended position and a retracted position; when the movable part rotates with the driving head, it can move to the extended position under the action of centrifugal force to abut against the driving gear, thereby driving the driving gear to rotate with the movable part; the movable part can move to the retracted position when the centrifugal force weakens or disappears, disengage from the driving gear, so that the driving gear does not receive the driving force of the driving head.

[0010] The utility model arranges a movable part between the driving head and the driving gear, so that only when the rotation speed of the driving head reaches a certain speed and sufficient centrifugal force is generated on the movable part to move it to the extended position, it forms transmission with the driving gear and then drives the developing roller to rotate. When the rotation speed of the driving head is low, the movable part moves to the retracted position, does not form transmission with the driving gear, and does not drive the developing roller to rotate, so that the working time of the developing roller is shortened, wear is reduced, and the service life of the developing roller is increased.

[0011] In some embodiments, the processing box further includes an elastic member, and the elastic member is used to restore the movable member to the retracted position when the centrifugal force weakens or disappears.

[0012] In some embodiments, a connecting hole is provided on the driving head, and the movable part has a connecting column, which is slidably arranged in the connecting hole; when the movable part slides along the connecting hole to the extended position, the force-applying part at the end of the movable part abuts against the driving gear, thereby driving the driving gear to rotate with the movable part.

[0013] In some embodiments, there are two movable members, which are coaxially and oppositely arranged, the connecting hole extends radially, and the connecting posts of the two movable members are coaxially arranged in the connecting hole;

[0014] The two ends of the elastic member are respectively connected to the two movable members, so that the movable members can move toward each other in the radial direction, thereby returning to the retracted position.

[0015] In some embodiments, a protrusion is provided on the movable member, and two ends of the elastic member are respectively connected to the protrusions of the two movable members;

[0016] There are two elastic members, which are symmetrically arranged on both sides of the two movable members.

[0017] In some embodiments, the driving gear is provided with an inner cavity, and the movable member is disposed in the inner cavity;

[0018] A force-bearing portion protruding radially is provided on the inner wall of the inner cavity of the driving gear, and the number of the force-bearing portions corresponds to the number of movable parts; when the movable part rotates with the driving head, it can move to an extended position under the action of centrifugal force so as to abut against the force-bearing portion of the driving gear, thereby driving the driving gear to rotate with the movable part.

[0019] In some embodiments, a through hole is provided on the driving gear; a snap portion extending axially is provided on the driving head, the snap portion has an elastic force in the radial direction, and after the snap portion passes through the through hole, it abuts against the end face where the through hole is located, so that the driving head is fixed relative to the driving gear in the axial direction.

[0020] In some embodiments, the process cartridge further comprises:

[0021] a drum unit rotatably provided with a photosensitive drum;

[0022] A developing unit rotatably provided with a developing roller; the developing unit is rotatably mounted on the drum unit, the developing unit has a separation position and a contact position relative to the drum unit, in which the photosensitive drum and the developing roller are separated, and in which the photosensitive drum and the developing roller are in contact with each other; a developing coupling is provided on the developing unit; and

[0023] A reset member, two ends of which are respectively connected to the drum unit and the developing unit, and is used for rotating and resetting the developing unit relative to the drum unit;

[0024] When the image forming device outputs a rotational driving force, the driving head drives the movable member to move to the extended position and then drives the driving gear to rotate, and the driving gear drives the developing unit to rotate from the separated position to the contact position;

[0025] When the rotational driving force of the image forming device decreases or disappears, the movable member moves to the retracted position, and the driving gear no longer receives the driving force, the reset member drives the developing unit to rotate and reset from the contact position to the separation position.

[0026] Furthermore, the processing box is provided with a reset member and a movable member at the same time. When the driving head receives the rotational driving force, the movable member can make the developing roller abut against the photosensitive drum, so that the drum unit and the developing unit enter the state of processing the developing task. When there is no developing task, the reset member can reset the drum unit and the developing unit to maintain the initial separation state. The present application can realize the contact and separation of the developing roller and the photosensitive drum without the need to additionally set up a separation force receiving part, which is conducive to the miniaturization of the processing box.

[0027] In some embodiments, the reset member includes a first reset member, which is a tension spring, and its two ends are respectively connected to the end cover of the drum unit and the developer cover of the developer unit, and the first reset member is arranged at the upper part of the processing box in the height direction.

[0028] In some embodiments, the reset member includes a second reset member, which is a torsion spring, and two ends of the second reset member are respectively connected to the end cover of the drum unit and the developer cover of the developer unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional diagram of a processing box according to the first embodiment of the utility model;

[0030] Figure 2 This is a structural disassembly diagram of a processing box according to Embodiment 1 of the present utility model;

[0031] Figure 3 This is a schematic structural diagram of a developing protective cover according to a first embodiment of the utility model;

[0032] Figure 4 It is a left side view of the processing box of the first embodiment of the utility model;

[0033] Figure 5 This is a structural disassembly diagram of the developing coupling in the first embodiment of the utility model;

[0034] Figure 6 This is a schematic diagram of the structure of the driving head and the movable component in the first embodiment of the utility model;

[0035] Figure 7 This is a diagram showing the state in which the movable component of the first embodiment of the utility model drives the driving gear to rotate;

[0036] Figure 8 This is a contact structure diagram of the photosensitive drum and the developing roller of the processing box of the first embodiment of the utility model;

[0037] Fig. 9 This is a diagram of the movable component of the first embodiment of the utility model in the idling state in the inner cavity of the driving gear;

[0038] Fig.10 This is a structural diagram of the separation of the photosensitive drum and the developing roller of the processing box in the first embodiment of the utility model;

[0039] Fig.11 It is a schematic diagram of the installation of the buckle portion and the through hole of the driving gear in the first embodiment of the utility model;

[0040] Reference numerals:

[0041] 1-drum unit, 11-photosensitive drum, 12-photosensitive frame, 13-driving side end cover, 14-conductive side end cover, 131-first rotary hole, 132-second rotary hole, 133-positioning column, 1331-anti-slip portion, 15-photosensitive drum coupling;

[0042] 2-developing unit, 21-box body, 22-driving side bearing, 23-developing roller, 24-powder feeding roller, 25-developing protective cover;

[0043] 3-first reset member, 251-first clamping portion, 252-cylindrical portion, 134-second clamping portion, sleeve portion 254;

[0044] 4-developing coupling, 41-driving gear, 411-force-bearing part, 412-through hole, 413-inner cavity, 42-driving head, 421-driving column, 4211-connecting hole, 4212 buckle part; 43-movable part, 431-protrusion, 432-force-applying part, 433-connecting column, 44-elastic part, 441-circular hook ring;

[0045] 5-second restoring member, 121-first abutting portion, 253-second abutting portion. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] The utility model relates to a processing box, the processing box comprises a developing unit and a drum unit, the developing unit can be installed on the drum unit, an image forming device has an installation bin, the processing box is detachably installed in the installation bin, and the image forming device uses, for example, electronic photographic imaging to form an image on a recording material. The image forming device includes, for example, an electronic photographic copier, an electronic photographic image forming device (LED image forming device, laser image forming device, etc.), an electronic photographic image forming device type fax machine, etc.

[0049] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0050] Embodiment 1

[0051] Figure 1The structure of a processing box according to the utility model is schematically shown. For the convenience of description, the length direction of the processing box is the X-axis direction, the end pointing to the +X-axis direction is the right side, and the end pointing to the -X-axis direction is the left side. The width direction of the processing box is the Y-axis direction, the end pointing to the +Y-axis direction is the front side, and the end pointing to the -Y-axis direction is the back side. The height direction of the processing box is the Z-axis direction, the end pointing to the +Z-axis direction is the upper side, and the end pointing to the -Z-axis direction is the lower side. The X-axis, Y-axis and Z-axis are perpendicular to each other, forming a three-axis coordinate system, as shown in FIG. Figure 1 As shown, the process box includes a drum unit 1, a developing unit 2, a reset member and a developing coupling 4, wherein the reset member includes a first reset member 3 and a second reset member 5.

[0052] like Figure 2 As shown, the drum unit 1 includes a photosensitive drum 11, a charging roller, a photosensitive drum coupling 15 and a photosensitive frame 12. The photosensitive frame 12 includes end covers arranged on both sides of the X-axis direction, which are a driving side end cover 13 and a conductive side end cover 14. The photosensitive frame 12 is a frame structure. The conductive side end cover 14 is arranged on the +X axis side (right side) of the photosensitive frame 12, and the driving side end cover 13 is arranged on the -X axis side (left side) of the photosensitive frame 12. The two ends of the photosensitive drum 11 in the length (X axis) direction are rotatable. Installed on the driving side end cover 13 and the conductive side end cover 14, the photosensitive drum 11 is arranged on the -Z axis side (lower end) of the photosensitive frame 12 in the Z axis direction; both ends of the charging roller in the length (X axis) direction are installed on the photosensitive frame 12, and the charging roller is used to charge the surface of the photosensitive drum 11 with a uniform charge so that the photosensitive drum 11 can absorb carbon powder; the photosensitive drum coupling 15 is connected to the -X axis side of the photosensitive drum 11, and is rotatably installed on the driving side end cover 13, and is used to receive power from the image forming device.

[0053] The driving side end cover 13 is provided with a first rotary hole 131 and a second rotary hole 132, both of which are through-hole structures on the driving side end cover 13, and the photosensitive drum coupling 15 passes through the second rotary hole 132, and the rotation axis of the first rotary hole 131 is in the X-axis direction. In the Z-axis (height) direction, the first rotary hole 131 is closer to the upper side of the photosensitive frame 12 than the photosensitive drum 11. In addition, the developing unit 2 can be rotatably mounted on the photosensitive frame 12, specifically, both ends of the developing unit 2 in the length (X-axis) direction can be rotatably mounted on the driving side end cover 13 and the conductive side end cover 14, and the developing unit 2 rotates around the rotation axis of the first rotary hole 131. The second rotary hole 132 is closer to the lower end of the driving side end cover 13, and the photosensitive drum coupling 15 is installed in the second rotary hole 132 to drive the photosensitive drum 11, and one end of the photosensitive drum coupling 15 exposed in the second rotary hole 132 can receive the power of the image forming device.

[0054] like Figure 2As shown, the developing unit 2 includes a box body 21, a driving side bearing 22, a conductive side bearing (not shown), a developing roller 23, a powder feeding roller 24, and a developing cover 25. The interior of the box body 21 is a hollow structure for storing toner. The driving side bearing 22 and the conductive side bearing are fixedly installed at both ends of the length (X axis) direction of the box body 21. The powder feeding roller 24 and the developing roller 23 are rotatably supported on the driving side bearing 22 and the conductive side bearing at both ends of the length direction of the box body 21. The driving side bearing 22 is installed on the -X axis side of the box body 21, and the conductive side bearing is installed on the +X axis side of the box body 21; the developing roller 23 is located on the -Z axis of the box body 21. On the side, a developing gear is installed on the -X axis side of the developing roller 23, and the developing gear is sleeved on the end of the developing roller extending out of the driving side bearing 22. The powder feeding roller is located on the -Z axis side of the box body 21, and a powder feeding gear is installed on the -X axis side of the powder feeding roller 24, and the powder feeding gear is sleeved on the end of the shaft of the powder feeding roller 24 extending out of the driving side bearing 22. The powder feeding roller 24 can transfer the carbon powder of the box body 21 to the developing roller 23. The carbon powder adsorbed by the developing roller 23 transfers the carbon powder to the photosensitive drum 11 through the potential difference between the developing roller 23 and the photosensitive drum 11. The carbon powder on the photosensitive drum 11 is then transferred through the transfer belt of the image forming device to form an image on the recording material (such as paper).

[0055] The developer protective cover 25 is a cover structure, and the developer protective cover 25 is fixedly mounted on the -X axis side of the driving side bearing 22, and is specifically detachably mounted on the driving side bearing 22. The -X axis side of the developer protective cover 25 is provided with a sleeve portion 254, a cylindrical portion 252, a first clamping portion 251, and a second abutting portion 253, as shown in FIG. Figure 3 The cylindrical portion 252 is a cylindrical structure protruding in the -X axis direction of the developer cover 25. The diameter of the cylindrical portion 252 is adapted to the diameter of the first rotary hole 131, that is, the cylindrical portion 252 can be installed in the first rotary hole 131 for rotation, that is, the developer unit 2 can be connected to the drum unit 1 through the developer cover 25, and the developer unit 2 can rotate around the rotation axis of the first rotary hole 131, thereby realizing a rotatable installation on the drum unit 1. The cylindrical portion 252 is an integrally designed cylindrical structure, and the sleeve portion 254 is located on the +X axis side of the cylindrical portion 252 and is the same as the axis of the cylindrical portion 252. The diameter of the sleeve portion 254 is larger than the diameter of the cylindrical portion 252, and the sleeve portion 254 is used to surround a part of the structure of the developer coupling 4.

[0056] like Figure 2As shown, the first reset member 3 is arranged on the +Z axis side of the drum unit 1 and the developing unit 2. In the X axis direction, the first reset member 3 is located on the -X axis side of the developing unit 2, and in the Z axis direction, the first reset member 3 is located on the +Z axis side (above) of the first rotating hole 131. In this embodiment, the first reset member 3 adopts a tension spring, which can be stretched or compressed in the Y axis direction to release elastic potential energy. One end of the first reset member 3 on the +Y axis side is connected to the drum unit 1, and one end of the first reset member 3 on the -Y axis side is connected to the developing unit 2. Specifically, a second clamping portion 134 is provided on the side of the photosensitive frame 12 in an abutting manner, as shown in FIG. Figure 3 As shown, a first clamping portion 251 is provided on the side of the developer cover 25, and the second clamping portion 134 is arranged opposite to the first clamping portion 251. The first reset member 3 is respectively clamped with the first clamping portion 251 and the second clamping portion 134 at both ends in the Y-axis direction. When the developer unit 2 rotates forward around the rotation axis of the first rotation hole 131 ( Figure 4 For example, when the developer cover 25 rotates clockwise, the first clamping portion 251 approaches the -Y axis direction of the drum unit 1, and the first reset member 3 is stretched to store elastic potential energy. At this time, the developer roller 23 is in contact with the photosensitive drum 11. When the elastic potential energy of the first reset member 3 is released, the first reset member 3 applies a pulling force in the +Y direction to the first clamping portion 251, so that the developer unit 2 rotates in the opposite direction around the rotation axis of the first rotation hole 131 ( Figure 4 For example, counterclockwise rotation), the developing roller 23 and the photosensitive drum 11 are separated. Figure 4 As shown, the developing coupling 4 is arranged on the developing unit 2, and can drive the developing roller 23 to rotate. The developing coupling 4 is located on the -X axis side of the developing unit 2, and drives the developing gear and the powder feeding gear respectively through the gear structure, thereby driving the developing roller 23 and the powder feeding roller 24. The developing coupling 4 is a receiving mechanism for the driving force output by the image forming device, that is, it serves as the main driving force of the developing unit 2. The developing coupling 4 is arranged in the developing cover 25, that is, the developing cover 25 can be used to protect the developing coupling 4, wherein the -X axis side of the cylindrical portion 252 of the developing cover 25 is an open structure, and the developing coupling 4 is exposed on the cylindrical portion 252, so that the driving head 42 of the developing coupling 4 can receive the driving force from the image forming device and drive the developing unit 2 to rotate through the movable part 43.

[0057] The driving side end cover 13 is provided with a positioning column 133, which is located between the first rotating hole 131 and the second rotating hole 132 in the Z-axis direction. An anti-slip portion 1331 is also provided at the end of the positioning column 133 (see Figure 4 ), the anti-slip portion 1331 is specifically a radial protrusion structure integrally formed on the positioning column 133, so that the positioning column 133 forms a hook-shaped limiting structure.

[0058] The developing cover 25 of this embodiment is provided with a second abutment portion 253, and the processing box also includes a second reset member 5. The second reset member 5 adopts a torsion spring and also has two ends that are subjected to force. The torsion center of the second reset member 5 can be installed on the positioning column 133, and the anti-detachment portion 1331 can be used to prevent the second reset member 5 from detaching from the positioning column. The second reset member 5 is arranged between the two sides of the first rotating hole 131 in the Z-axis direction. One end of the second reset member 5 abuts against the first abutment portion 121, and the specific abutment limit is within the "L"-shaped structure of the positioning column. The other end of the second reset member 5 abuts against the second abutment portion 253, so the second reset member 5 can be subjected to force and twisted.

[0059] In the first state, that is, when the color processing box is required to participate in the printing operation, after the developing coupling 4 is driven by the image forming device, that is, the driving head 42 receives the driving force, and gradually starts to rotate from stop, or when the rotation speed reaches a certain level, it drives the driving gear 41 to rotate, so that the developing unit 2 rotates clockwise around the axis of the first rotating hole 131 ( Figure 4 In the second state, the developing coupling 4 stops receiving or receives a slower rotational driving force, but the driving gear does not rotate (the principle of the driving gear not rotating will be described in detail later), that is, the developing unit 2 does not rotate clockwise around the axis of the first rotating hole, and the elastic potential energy of the first reset member 3 and the torsional potential energy of the second reset member 5 are released. Under the action of the released elastic potential and torsional potential energy, the developing unit 2 rotates in the opposite direction (counterclockwise), and the developing roller 23 is separated from the photosensitive drum 11. Under the action of the torsional potential energy of the second reset member 5, the developing roller 23 is kept separated from the photosensitive drum 11.

[0060] like Figure 5 As shown, specifically, the developing coupling 4 includes a driving gear 41 and a driving head 42. The outer circumferential surface of the driving gear 41 has a two-layer gear structure, and the two-layer gear structures have different diameters, respectively driving the developing gear and the powder feeding gear. The interior of the driving gear 41 has a hollow inner cavity 413 structure, and the interior of the driving gear 41 is provided with a force-bearing portion 411 protruding toward the axial direction. At least one force-bearing portion 411 is provided, and two are provided in this embodiment, which are symmetrically arranged in the inner cavity 413. A through hole 412 structure is provided on one side of the inner cavity 413 of the driving gear 41 relative to the driving head 42. The force-bearing portion 411 is a structure protruding along the radial direction of the driving gear 41. It should be noted that the force-bearing portion 411 of this embodiment is located in the driving gear 41 and does not protrude from the end face of the driving gear 41 on the -X axis side. The diameter of the through hole 412 is larger than the diameter of the driving column 421 of the driving head 42, so that the driving column 421 can pass through the through hole 412.

[0061] like Figure 6As shown, the driving head 42 is a structure for receiving the driving force of the image forming device, that is, the driving head 42 is used to receive the driving force of the image forming device, the driving head 42 is composed of two cylinders with different diameters, the interior of the driving head 42 has a hollow structure, a driving column 421 is provided on the side of the driving head 42 away from receiving the driving force of the image forming device (i.e., the +X side), and a buckle portion 4212 and a connecting hole 4211 for limiting the movement direction of the movable member 43 are provided on the side of the driving column 421 away from the driving force receiving end (i.e., the +X side). The connecting hole 4211 passes through the driving column 421.

[0062] At least one buckle portion 4212 is provided, and is symmetrically arranged relative to the drive column 421. Openings are respectively provided on both sides of the buckle portion 4212 in the circumferential direction, so that the buckle portion 4212 can be ensured to have an elastic effect of radially approaching and moving away from the axis of the drive head. When the drive column 421 is axially inserted into the through hole 412, the buckle portion 4212 is pressed radially inward to store elastic potential energy, and the drive column 421 continues to be inserted axially until the buckle portion 4212 extends out of the side of the through hole 412 located in the +X direction (see Fig.11 ), the snap-on portion 4212 recovers its shape in the radial direction and releases the elastic potential energy, so that the snap-on portion 4212 abuts and gets stuck with the end face of the through hole 412 in the +X direction, so that the driving column 421 is fixed relative to the driving gear 41 in the axial direction to prevent the driving column 421 from axially disengaging from the driving gear 41, but the driving column 421 and the driving gear 41 can rotate relative to each other, that is, the snap-on portion 4212 does not cause the driving head 42 to be linked with the driving gear 41 in the rotation direction, and the rotational linkage between the driving head 42 and the driving gear 41 is achieved through a movable component, which is described in detail below.

[0063] The movable component includes a movable part 43 and an elastic part 44, which are arranged in the developing coupling 4, specifically between the driving head 42 and the driving gear 41. The force-applying part 432 at one end of the movable part 43 abuts against the force-bearing part 411 of the inner cavity of the driving gear 41, and the connecting column 433 at the other end of the movable part 43 is inserted into the connecting hole 4211, so that the movable part 43 can slide along the extension direction of the connecting hole 4211. In this embodiment, the connecting hole 4211 extends radially, and in other embodiments, it can also extend in other directions, as long as the force-applying part 432 at the end of the movable part 43 can extend and abut against the force-bearing part 411. The movable part 43 is also provided with a protrusion 431. Specifically, after the movable part 43 is inserted into the connecting hole 4211, the round hook rings 441 at both ends of the elastic part 44 respectively connect the protrusions 431 of the two movable parts 43. The movable part 43 is installed in the connecting hole 4211 by the elastic part 44.

[0064] In this embodiment Figure 6Two movable members 43 and two elastic members 44 are used. A further modification can be to use a method in which an elastic member is installed on the connecting column of the two movable members to realize the movable installation method of the movable member 43.

[0065] By adopting such a developing coupling method, when the rotating driving head 42 reaches a certain speed, the movable part 43 will move to an extended position in the connecting hole 4211 along a radial direction away from the axial direction of the driving head (or driving gear) due to the centrifugal force of the rotation. When the driving head 42 does not receive the rotational force or the rotation speed of the driving head 42 is small, and the rotational centrifugal force received by the movable part 43 is smaller than the elastic force of the elastic part 44, the movable part 43 will approach the rotation axis of the driving head (or driving gear) under the elastic recovery force of the elastic part and move to a retracted position. By arranging a movable part 43 between the driving head 42 and the driving gear 41, it is possible to form transmission with the driving gear 41 only when the rotation speed of the driving head 42 reaches a certain speed and generates sufficient centrifugal force for the movable part 43 to move it to the extended position, thereby driving the developing roller 23 to rotate. When the rotation speed of the driving head 42 is low, the movable part 43 moves to the retracted position, does not form transmission with the driving gear 41, and does not drive the developing roller 23 to rotate, thereby shortening the working time of the developing roller 23, reducing wear and tear, and increasing the service life.

[0066] Figure 7 As shown, the movable member is in the inner cavity 413 of the driving gear, and in the driving head 42 ( Figure 7 After receiving the rotational force in the rotational direction A and starting to rotate, the movable member 43 moves radially away from the axis under the rotational centrifugal force, that is, extends radially, and the elastic member 44 is stretched (storing elastic potential energy), and the force-applying portion 432 abuts against the force-receiving portion 411, thereby driving the driving gear 41 to rotate around the rotational direction A, and then driving the developing roller 23 and the powder feeding roller 24 to rotate. When the rotational torque is greater than the elastic potential energy of the first reset member 3 and the second reset member 5, the developing unit 2 can rotate around the first rotating hole 131 ( Figure 8 The developing roller 23 is rotated in a clockwise direction as shown in the figure, thereby realizing the developing contact between the developing roller 23 and the photosensitive drum 11. Under the action of the rotational driving force of the image forming device continuously received by the driving head 42, the developing contact between the developing roller 23 and the photosensitive drum 11 can be continuously and stably ensured, thereby realizing stable developing work.

[0067] Fig. 9 As shown, when the drive head 42 ( Fig. 9When the centrifugal force of the movable member 43 is less than the elastic force of the elastic member (not shown), the elastic member 44 elastically contracts (releasing elastic potential energy), and a radial gap exists between the force-applying portion 432 and the force-receiving portion 411. At this time, the drive head 42 drives the movable components (movable member 43 and elastic member 44) to rotate in the inner cavity 413, but cannot drive the drive gear 41 to rotate. When the drive head 42 rotates at a speed less than a certain set value, a rotation buffering effect is formed, and the drive head 42 has no driving connection with the drive gear. The drive head continues to rotate or does not rotate, and the drive gear is not affected.

[0068] refer to Fig.10 As shown, at this time, under the action of the first reset member 3 and the second reset member 5 , the developing unit 2 rotates counterclockwise around the first rotating hole 131 , so that the developing roller 23 moves away from the photosensitive drum 11 , and then the developing roller 23 is separated from the photosensitive drum 11 .

[0069] Installing the movable part 43 between the driving head 42 and the driving gear 41 is beneficial to saving space, protecting the movable part 43, and not easily interfering with other parts.

[0070] The specific working principle is as follows: in the first state, that is, when the processing box needs to complete the developing work, the image forming device outputs the driving force to the driving head 42, and the driving head 42 rotates to drive the movable member 43 to rotate around the axial direction A of the driving head 42. The movable member 43 is subjected to the centrifugal force of rotation, or when the speed reaches a certain value, the movable member 43 extends radially, and the gap between the force-applying part 432 and the force-receiving part 411 shrinks and finally abuts against each other. The force-applying part 432 transmits the power to the force-receiving part 411 and drives the driving gear 41 to rotate along the A direction. At this time, the driving gear 41 The torsional force generated by the rotation drives the developing unit 2 to rotate in the direction A. The developing unit 2 rotates in the direction A around the axial direction of the first rotating hole 131 and overcomes the elastic force of the first reset member 3 and the second reset member 5. The developing roller 23 abuts against the photosensitive drum 11. The continuous rotation force of the driving gear 41 drives the developing roller 23 and the powder feeding roller 24 to rotate. The movable member 43 delays the trend of the developing roller approaching the photosensitive drum when receiving the driving force. Only when the rotation speed of the driving head 42 reaches a certain value will it drive the developing roller to contact the photosensitive drum, which can effectively ensure the improvement of printing quality.

[0071] In the second state, that is, when the processing box has no developing task, the image forming device stops outputting the driving force to the driving head 42, the driving head 42 is not affected by the driving force, or when the rotation speed of the driving head 42 drops below a certain value, the elastic restoring force from the elastic member 44 on the movable member 43 is greater than the centrifugal force it receives, and the movable member 43 is reset under the release of the elastic potential energy of the elastic member 44, so that the force-applying portion 432 is separated from the force-receiving portion 411, and there is a gap between the two. The driving gear 41 is not rotated by the driving force, and the developing unit 2 no longer receives the torsional force, and the elastic potential energy of the first reset member 3 and the second reset member 5 is released, prompting the developing unit 2 to reverse ( Fig.10 The movable member 43 disconnects the connection between the driving head 42 and the driving gear 41 when the driving force gradually weakens (the rotation speed decreases) but has not completely disappeared (the rotation speed has not dropped to zero), so that the developing unit 2 can rotate to the separation position in advance under the action of the reset member, thereby realizing the separation of the drum and the roller.

[0072] It can be seen that when the image forming device needs to separate the drum and roller of the color processing box to perform a printing operation, since the developing unit 2 has no driving force source, the drum unit 1 and the developing unit 2 are in the second state. At this time, the drum unit 1 and the developing unit 2 are kept separated from the drum roller under the support of the first reset member 3 and the second reset member 5; when the color processing box is required to participate in the printing operation, the developing coupling 4 receives the driving force from the image forming device, and the driving gear 41 has a rotational torque on the developing unit 2. The developing unit 2 overcomes the force of the first reset member 3 and the second reset member 5 through the torque to make the drum roller contact. The movable member 43 delays the tendency of the developing roller 23 to approach the photosensitive drum 11 when receiving the driving force, which can effectively ensure the improvement of printing quality.

[0073] It should be noted that the image forming device is provided with four processing boxes, which are arranged basically horizontally, and the rotational driving force is outputted from the driving shaft of the image forming device respectively. The image forming device provides bias voltages (charging bias, developing bias, etc.) to the four processing boxes respectively, and the processing boxes are installed in the image forming device through a tray. Specifically, the tray is constructed to be able to move in a horizontal direction when the image forming device is installed on a horizontal surface, and the four processing boxes are respectively installed at corresponding fixed positions of the tray. When the tray is moved into the image forming device, the four processing boxes are moved into the image forming device together with the tray. When the processing boxes need to be replaced, the four processing boxes can be moved together with the tray to the outside of the image forming device.

[0074] The image forming device in this embodiment has a drum drive coupling and a developer drive coupling. When the front door is closed, the drum drive coupling and the developer drive coupling for transmitting the driving force to the process cartridge protrude in the X direction. In addition, by opening the front door, the drum drive coupling and the developer drive coupling are retracted in the X direction. The purpose of doing so is, on the one hand, to make the drum drive coupling and the developer drive coupling better connected to the photosensitive drum coupling 15 and the developer coupling 4 of the process cartridge, respectively, so as to receive the driving force. On the other hand, it prevents the insertion / removal of the tray from being hindered.

[0075] By closing the front door and starting to drive the image forming apparatus, the drum drive coupling described above is engaged with the photosensitive drum coupling 15. In addition, the developer drive coupling is engaged with the developer coupling 4 to transmit the drive to the process cartridge. The drive transmission to the process cartridge is not limited to the above-mentioned manner, and the process cartridge can be set to receive only the driving force of the drum drive coupling, but not the driving force of the developer drive coupling. After the photosensitive drum coupling 15 receives the driving force of the drum drive coupling, it is transmitted to the developer coupling 4 through the relevant mechanism on the process cartridge to drive the developer roller to rotate.

[0076] The processing box of this embodiment has a reset member and a movable member. The reset member can keep the drum unit and the developing unit in an initial separation state. When the driving head receives the rotational driving force, the movable member can make the drum unit and the developing unit enter a state of processing a developing task, so that the developing roller abuts against the photosensitive drum. At the same time, when there is no developing task, the reset member can reset the drum unit and the developing unit to maintain an initial separation state. The present application does not need to additionally set up a separation force receiving part to achieve the separation and contact of the developing roller and the photosensitive drum, which is beneficial to the miniaturization of the processing box. In some embodiments, the movable member delays the tendency of the developing roller to approach the photosensitive drum when receiving the driving force, which can effectively ensure the improvement of printing quality.

[0077] Embodiment 2

[0078] Most of the structures of this embodiment are the same as those of the first embodiment, except that this embodiment only uses one reset member. For example, the first reset member 3 is removed and only the second reset member 5 is retained, which can also achieve the same effect as that of the first embodiment.

[0079] In the first state, that is, when the color processing box needs to participate in the printing operation, after the developing coupling 4 is driven, the driving head 42 rotates and then drives the driving gear 41, so that the developing unit 2 rotates clockwise in the direction A around the axis of the first rotating hole 131, and the second reset member 5 is restricted by force, storing torsional potential energy, and the developing roller 23 abuts against the photosensitive drum 11. In the second state, the developing coupling 4 does not receive the driving force, and the torsional potential energy of the second reset member 5 is released. Under the action of the second reset member 5, the developing unit 2 rotates in the opposite direction, and the developing roller 23 is separated from the photosensitive drum 11.

[0080] Embodiment 3

[0081] Most of the structures of this embodiment are the same as those of the first embodiment, except that only one reset member is used in this embodiment. For example, the second reset member 5 is removed and only the first reset member 3 is retained, which can also achieve the same effect as that of the first embodiment. The above working method and principle are similar to those of the first embodiment, and will not be described in detail here.

[0082] The above description is only a preferred embodiment of the present invention. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. This does not limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A process cartridge detachably mounted on an image forming device, characterized in that: include: Developing roller; a developing coupling, comprising a driving head and a driving gear, wherein the driving head is used to receive a driving force of the image forming device, and the driving gear is used to drive the developing roller to rotate; The drive head and the drive gear are coaxially arranged and can rotate relative to each other; The movable part is arranged to have an extended position and a retracted position; when the movable part rotates with the drive head, it can move to the extended position under the action of centrifugal force so as to abut against the drive gear, thereby driving the drive gear to rotate with the movable part; when the centrifugal force weakens or disappears, the movable part can move to the retracted position and disengage from the drive gear, so that the drive gear does not receive the drive force of the drive head.

2. The process cartridge according to claim 1, wherein: It also includes an elastic member, which is used to restore the movable member to a retracted position when the centrifugal force weakens or disappears.

3. The process cartridge according to claim 2, wherein: The driving head is provided with a connecting hole, and the movable part has a connecting column, which is slidably arranged in the connecting hole; when the movable part slides along the connecting hole to the extended position, the force-applying part at the end of the movable part abuts against the driving gear, thereby driving the driving gear to rotate with the movable part.

4. The process cartridge according to claim 3, wherein: There are two movable parts, which are coaxially and oppositely arranged, the connecting hole extends radially, and the connecting posts of the two movable parts are coaxially arranged in the connecting hole; Both ends of the elastic member are connected to the two movable members respectively, so that the movable members can move toward each other in the radial direction, thereby returning to the retracted position.

5. The process cartridge according to claim 4, wherein: The movable member is provided with a protrusion, and the two ends of the elastic member are respectively connected to the protrusions of the two movable members; There are two elastic members, which are symmetrically arranged on both sides of the two movable members.

6. The process cartridge according to any one of claims 1 to 5, characterized in that: The driving gear is provided with an inner cavity, and the movable member is arranged in the inner cavity; A force-bearing portion protruding radially is provided on the inner wall of the inner cavity of the driving gear, and the number of the force-bearing portions corresponds to the number of the movable parts; when the movable part rotates with the driving head, it can move to an extended position under the action of centrifugal force so as to abut against the force-bearing portion of the driving gear, thereby driving the driving gear to rotate with the movable part.

7. The process cartridge according to any one of claims 1 to 5, characterized in that: The driving gear is provided with a through hole; the driving head is provided with a snap-on portion extending axially, the snap-on portion has a radial elastic force, and after passing through the through hole, the snap-on portion abuts against the end face where the through hole is located, so that the driving head is fixed relative to the driving gear in the axial direction.

8. The process cartridge according to any one of claims 1 to 5, characterized in that: Also includes: a drum unit rotatably provided with a photosensitive drum; a developing unit rotatably provided with the developing roller; The developing unit is rotatably mounted on the drum unit, and the developing unit has a separation position and a contact position relative to the drum unit, in which the photosensitive drum and the developing roller are separated, and in which the photosensitive drum and the developing roller are in contact with each other; the developing coupling is arranged on the developing unit; as well as A reset member, two ends of which are respectively connected to the drum unit and the developing unit, and used for rotating and resetting the developing unit relative to the drum unit; When the image forming device outputs a rotational driving force, the driving head drives the movable member to move to the extended position and then drives the driving gear to rotate, and the driving gear drives the developing unit to rotate from the separated position to the contact position; When the rotational driving force of the image forming device decreases or disappears, the movable member moves to the retracted position, and the driving gear no longer receives the driving force, the reset member drives the developing unit to rotate and reset from the contact position to the separation position.

9. The process cartridge according to claim 8, wherein: The reset member includes a first reset member, which is a tension spring, both ends of which are respectively connected to the end cover of the drum unit and the developer cover of the developer unit, and the first reset member is arranged on the upper part of the process box in the height direction.

10. The process cartridge according to claim 8, wherein: The reset member comprises a second reset member, which is a torsion spring, and two ends of the second reset member are respectively connected to the end cover of the drum unit and the developing protective cover of the developing unit.

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