Drive transmission device, driving device, and image forming apparatus

Abstract

To solve a problem in which when a field core of an electromagnetic clutch is provided integrally with an energization part such as a connector including a terminal for energization, and a device body-side connection part is electrically connected to the energization part, a noise may be generated depending on the configuration of the device body-side connection part.SOLUTION: A drive transmission device comprises an electromagnetic clutch (88) integral with an energization part (200). The energization part (200) is integral with a field core (210). A device body-side connection part electrically connected to the energization part (200) applies external force to the energization part (200) in an electrically connected state. The drive transmission device has fall prevention parts (321, 320) that prevent, while being engaged with the energization part (200), fall of the field core (210) toward a rotor boss part. The fall prevention parts preferably have an opposing part (320) that opposes the energization part (200) from one side in a direction in which the fall may occur, and an urging part (321) that urges the energization part (200) from the other side toward the opposing part.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a drive transmission device, a drive unit, and an image forming apparatus. [Background technology]

[0002] 2. Description of the Related Art A drive transmission device including an electromagnetic clutch with an integrated current-carrying portion is known. For example, Patent Document 1 describes an electromagnetic clutch (84) having a cylindrical body (84A) with a terminal printed wiring board (86) attached to its outer periphery via a block-shaped spacer (88). With the electromagnetic clutch positioned at a predetermined position, it is provided with an elastically deformable contact terminal (104) that presses against a conductive pattern (90) of the terminal printed wiring board to provide an electrical connection. Summary of the Invention [Problem to be solved by the invention]

[0003] When an electrical connection part such as a connector equipped with a terminal for supplying electricity was integrated into the field core of the electromagnetic clutch and the connection part on the device body was electrically connected to this electrical connection part, it was found that abnormal noises could occur depending on the configuration of the connection part on the device body. [Means for solving the problem]

[0004] In order to solve the above-mentioned problems, the present invention provides a drive transmission device having an electromagnetic clutch with an integrated current-carrying part, the current-carrying part being integrated with a field core, a connection part on the device main body side which is electrically connected to the current-carrying part applies an external force to the current-carrying part in an electrically connected state, and a tilt suppression part which engages with the current-carrying part to suppress the field core from tilting relative to a rotor boss portion due to the external force. Effect of the Invention

[0005] According to the present invention, in a configuration in which a current-carrying part, such as a connector having a current-carrying terminal, is integrally provided with a field core of an electromagnetic clutch, the generation of abnormal noise can be suppressed. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram showing a printer according to an embodiment. [Diagram 2] FIG. [Diagram 3] FIG. 4 is a schematic perspective view of the drive unit with a resin housing removed. [Figure 4] FIG. 4 is a perspective view of the drive unit with the mounting plate (bracket) removed. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 4 is an enlarged perspective view of a basic configuration in the vicinity of a rotation stopper opening of the drive device. [Figure 8] FIG. [Figure 9] FIG. 4 is an explanatory diagram showing an example of how a load is applied to a harness. [Figure 10] FIG. 4 is an explanatory diagram of a first configuration example of a collapse prevention unit. [Figure 11] FIG. 13 is an explanatory diagram of a modification of the first configuration example. [Figure 12] 13 is an explanatory diagram of another example of the configuration of the collapse prevention unit. FIG. [Figure 13] FIG. 13 is an explanatory diagram of yet another example configuration of the collapse prevention unit. [Figure 14] FIG. 13 is an explanatory diagram of yet another example configuration of the collapse prevention unit. [Figure 15] 11 is an explanatory diagram of a modified example of an electromagnetic clutch to which the present invention can be applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] The following description will be given of an image forming apparatus to which the present invention is applied, taking as an example an electrophotographic printer (hereinafter, simply referred to as a printer) that forms images by electrophotography. The present invention will be described as an image forming apparatus using an electrophotographic method, but is not limited to this, and can also be applied to image forming apparatuses using an inkjet method, a stencil printing method, or the like.

[0008] First, the basic configuration of the printer according to the embodiment will be described. Fig. 1 is a schematic diagram showing the printer according to the embodiment. The directions of X, Y, and Z in the figure are as follows, and are the same in other figures. The X direction is a direction parallel to the left and right of the device and runs from left to right, with Fig. 1 being a view from the front of the printer. The Y direction is a direction parallel to the front and rear of the device and runs from front to rear. The Z direction is a vertical direction running from bottom to top.

[0009] In the figure, the printer includes a photoconductor 1 as a latent image carrier, and a paper feed cassette 100 that is detachably attached to a main body housing 50. The paper feed cassette 100 stores a plurality of recording sheets S in a sheet stack.

[0010] The recording sheets S in the paper feed cassette 100 are sent out from the cassette by the rotational drive of the main body paper feed roller 41, and only the topmost sheet is separated and sent out at the separation nip between the main body paper feed roller 41 and the separation pad 48, and reaches the main body paper feed path R1. Thereafter, the recording sheet S is sandwiched between the relay roller pair 42, and is transported in the main body paper feed path R1 from the upstream side to the downstream side in the transport direction.

[0011] The downstream end of the main body paper feed path R1 communicates with the common transport path R3, and the common transport path R3 is provided with a pair of registration rollers 43. The transport of the recording sheet S is temporarily stopped when the leading edge of the recording sheet S abuts against the nip of the stopped registration roller pair 43. At the time of the abutment, the skew of the recording sheet S is corrected.

[0012] The pair of registration rollers 43 start rotating at a timing when the recording sheet S can be superimposed on the toner image on the surface of the photoconductor 1 at the transfer nip, and feed the recording sheet S toward the transfer nip. At this time, the pair of relay rollers 42 simultaneously start rotating and resume the transport of the recording sheet S that was temporarily stopped.

[0013] The main body 50 of the printer is provided with a manual feed unit 30 including a manual feed tray 31, a manual feed roller 32, and a separation pad 33. A recording sheet S manually fed into the manual feed tray 31 of the manual feed unit 30 is sent from the manual feed tray 31 to a manual feed path R2 by the rotational drive of the manual feed roller 32.

[0014] The recording sheet S sent out by the manual feed roller 32 passes through a separation nip in the manual feed path R2 where the manual feed roller 32 abuts against a separation pad 33, and is then sent to the common transport path R3 and transported to the registration roller pair 43. After that, like the recording sheet S sent out from the paper feed cassette 100, this recording sheet S passes through the registration roller pair 43 and is then sent to the transfer nip.

[0015] A cleaning blade 2, a charging roller 4, a latent image writing device 7, a developing device 8, a transfer roller 10, etc. are arranged around the drum-shaped photoreceptor 1, which is driven to rotate in a clockwise direction in the figure. The charging roller 4 rotates while in contact with the photoreceptor 1 to form a charging nip. A voltage is applied to this charging roller 4 from a charging power source. As a result, the surface of the photoreceptor 1 is uniformly charged by a charging bias generated between the surface of the photoreceptor 1 and the surface of the charging roller 4 in the charging nip.

[0016] The latent image writing device 7 is equipped with an LED array and performs optical writing using LED light on the uniformly charged surface of the photoconductor 1. The potential of the area of ​​the uniformly charged surface of the photoconductor 1 that is irradiated with the writing light is attenuated, and an electrostatic latent image is formed on the surface of the photoconductor 1.

[0017] As the photoconductor 1 rotates, the electrostatic latent image passes through a development area facing the developing device 8. In this development area, toner is supplied to the electrostatic latent image on the photoconductor 1 by the developing roller 8a, so that the electrostatic latent image is developed.

[0018] A toner cartridge 9 is disposed above the developing device 8. The toner cartridge 9 supplies the developing device 8 with toner contained therein.

[0019] The toner image formed on the photoconductor 1 by development enters the transfer nip where the photoconductor 1 and transfer roller 10 come into contact with each other as the photoconductor 1 rotates. A voltage of the opposite polarity to the latent image potential of the photoconductor 1 is applied to the transfer roller 10, which forms a transfer bias in the transfer nip.

[0020] As described above, the pair of registration rollers 43 sends the recording sheet S toward the transfer nip at a timing that allows the recording sheet S to be superimposed on the toner image on the photoreceptor 1 within the transfer nip. The toner image on the photoreceptor 1 is transferred to the recording sheet, which has been brought into close contact with the toner image at the transfer nip, by the action of the transfer bias and nip pressure.

[0021] After passing through the transfer nip, residual toner that has not been transferred to the recording sheet S adheres to the surface of the photoreceptor 1. The residual toner is scraped off from the surface of the photoreceptor 1 by a cleaning blade 2 that is in contact with the photoreceptor 1, and the surface of the photoreceptor 1 is cleaned.

[0022] The surface of the photoconductor 1 cleaned by the cleaning blade 2 is neutralized by a neutralizing means and then uniformly charged again by the charging roller 4.

[0023] The recording sheet S that has passed through the transfer nip where the photoconductor 1 and the transfer roller 10 come into contact is sent to the fixing device 44. The fixing device 44 forms a fixing nip by the contact between a fixing roller 44a containing a heat source such as a halogen lamp and a pressure roller 44b that is pressed against the fixing roller 44a. A toner image is fixed to the surface of the recording sheet S that has been sandwiched in the fixing nip by the action of heat and pressure. After that, the recording sheet S that has passed through the fixing device 44 passes through a paper discharge path R4 and is then sandwiched in the paper discharge nip of a pair of paper discharge rollers 46.

[0024] This printer can be switched between a single-sided mode in which an image is formed on only one side of the recording sheet S, and a double-sided mode in which an image is formed on both sides of the recording sheet S. In the single-sided mode, or in the double-sided mode in which images have already been formed on both sides of the recording sheet, the pair of discharge rollers 46 continues to rotate in the forward direction, thereby discharging the recording sheet S in the discharge path R4 to the outside of the machine. The discharged recording sheet S is stacked in a stack section provided on the top surface of the main body housing 50.

[0025] On the other hand, in the double-sided mode, when an image is formed only on one side of the recording sheet S, the pair of discharge rollers 46 is driven to rotate in the reverse direction when the trailing end of the recording sheet S enters the discharge nip of the pair of discharge rollers 46. At this time, a switching claw 47 disposed near the downstream end of the discharge path R4 is actuated to close the discharge path R4 and open the entrance to the reversing and re-sending path R5. The recording sheet S, which starts to return due to the reverse driving of the pair of discharge rollers 46, is sent into the reversing and re-sending path R5.

[0026] The downstream end of the reversing and re-sending path R5 joins the upstream side of the registration roller pair 43 of the common conveying path R3, and after being conveyed through the reversing and re-sending path R5, the sheet is re-sent to the registration roller pair 43 of the common conveying path R3. After that, the toner image is transferred to the other side at the transfer nip, and the sheet is discharged outside the apparatus via the fixing device 44, the paper discharge path R4, and the paper discharge roller pair 46.

[0027] Next, the drive device of this embodiment will be described. Fig. 2 is a schematic perspective view of the drive device 60 of the imaging unit. The drive device 60 transmits the drive force of a drive motor to the photoconductor 1, the developing device 8, the pair of registration rollers 43, and the main body paper feed roller 41. The drive device 60 has a resin housing 61 made of flame-retardant resin, and a mounting sheet metal 62. The resin housing 61 has a motor housing portion 61a that covers the drive motor 63 (see Fig. 3), and a gear housing portion 61b that covers the gear.

[0028] A photoconductor drive shaft 74, the tip of which is inserted into the photoconductor 1, and a coupling portion 90a of a developer drive transmission member 90 penetrate through the gear housing portion 61b. A photoconductor coupling 75 is attached to the photoconductor drive shaft 74, engaging with a flange portion of the photoconductor 1 to transmit a driving force to the photoconductor 1. Reference numeral 87 in the drawing denotes a registration output gear that outputs the driving force of the drive motor to the registration roller pair 43.

[0029] FIG. 3 is a schematic perspective view of the drive unit 60 with the resin housing 61 removed, and FIG. 4 is a perspective view of the drive unit 60 with the mounting sheet metal 62 (bracket) removed, viewed from the mounting sheet metal 62 side.

[0030] As shown in Fig. 4, a first input gear 71 and a second input gear 81 mesh with a motor gear provided directly on a motor shaft 63a of a drive motor 63 serving as an electrical component. An idler gear 72 meshes with the first input gear 71, and a photoconductor gear 73 meshes with the idler gear 72. As shown in Fig. 3, the photoconductor gear 73 is attached to a photoconductor drive shaft 74. The first input gear 71, the second input gear 81, and the idler gear 72 are provided between the mounting metal plate 62 and a motor bracket 63b made of metal plate.

[0031] A branch gear 82 meshes with the second input gear 81, and a first paper feed gear portion 83a of the paper feed transport gear 83 and a first registration gear 84 mesh with the branch gear 82. A developing electromagnetic clutch 88 and a first developing gear 89 (see FIG. 3) are provided on the same axis as the branch gear 82 as electrical components. A driving force is transmitted from the branch gear 82 to the first developing gear 89 via the developing electromagnetic clutch 88. The first developing gear 89 meshes with a developing gear portion 90b of the developing drive transmission member 90.

[0032] The paper feed conveying gear 83 has a first paper feed gear portion 83a and a second paper feed gear portion 83b, and the second paper feed gear portion 83b transmits the driving force of the drive motor 63 to a paper feed conveying drive transmission mechanism (paper feed drive unit 230 in Figure 8) which transmits the driving force to the main body paper feed roller 41.

[0033] A registration electromagnetic clutch 85 (see FIG. 3) and a registration second gear 86 (see FIG. 3) are provided coaxially with the registration first gear 84 as electrical components. A driving force is transmitted from the registration first gear 84 to the registration second gear 86 via the registration electromagnetic clutch 85. A registration output gear 87 that outputs the driving force of the drive motor to the registration roller pair 43 is meshed with the registration second gear 86.

[0034] In this embodiment, a connector-integrated type is used as the developing electromagnetic clutch 88 shown in Fig. 4. As shown in Fig. 4, a rotation prevention opening 220 is formed in a portion near the developing electromagnetic clutch 88 in the gear housing portion 61b.

[0035] 5 is a perspective view showing the members constituting the drive transmission path from the motor shaft 63a to the coupling portion 90a, as well as the members constituting the drive transmission path to the photoconductor drive shaft 74. The development electromagnetic clutch 88 having the connector 200 integrally therewith is sandwiched between the branch gear 82 and the development first gear 89, which are coaxial with each other.

[0036] The motor shaft 63a supplies drive not only to the image forming unit, but also to the paper feed unit and waste toner unit, so it continues to rotate while driving any member of any unit. Therefore, it does not need to rotate all the time for development, etc., and conversely, to stop it during periods when it is not needed due to its lifespan, an electromagnetic clutch is provided midway between the multiple drive transmission members as a connection cutoff mechanism. This keeps the so-called development travel distance to a minimum. For the same reason, the resist electromagnetic clutch 85 mentioned earlier is also provided (see FIG. 3).

[0037] FIG. 6 is a perspective view of the developing electromagnetic clutch 88 to which a connector 200 is attached as an electric current conducting part. It is a perspective view from a different angle than FIG. 6(a) and FIG. 6(b). In general, an electromagnetic clutch has a field having an annular housing part with one end open, an excitation coil formed by winding a coil wire around a spool and housed in the housing part together with the spool, a pin which is a terminal connected to the spool and electrically connected to the end of the coil wire, and a connector case which serves as a holding part for holding the pin. An electromagnetic clutch also has an armature, an armature hub, a rotor, and the like.

[0038] Connector 200, which houses pins 202 in connector case 201, is integrated with field core 210 made of sheet metal by gluing or the like. This connector 200 is also used as a rotation stopper for the field. Rotor boss 214, which is integrated with the rotor, is slidably housed in the through hole at the center of field core 210.

[0039] A D-cut cross-section portion of the shaft common to the branch gear 82 is inserted into a boss hole 215 of the rotor boss 214. An output part 211 is rotatably supported at the lower end of this shaft as shown in Fig. 6(a). When the electromagnetic clutch is in the ON state, this output part 211 is connected via an armature to a rotor that rotates integrally with the rotor boss 214 and rotates. The output part 211 has transmission claws 212 that protrude in the radial direction. A housing 213 that covers the field etc. may be integral with the field or with the output part 211.

[0040] The output portion 211 of the development electromagnetic clutch 88 is located in a recess formed on the side of the development first gear 89 facing the electromagnetic clutch (see FIG. 5). An engagement portion that engages with the transmission claw 212 of the output portion 211 is formed in this recess.

[0041] Fig. 7 is an enlarged perspective view of the basic configuration in the vicinity of anti-rotation opening 220 also shown in Fig. 4. Side portions 221 on both sides of anti-rotation opening 220 in the direction around the axis function as anti-rotation portions. An end surface portion 222 of anti-rotation opening 220 on the branch gear 82 side of connector 200 functions as a thrust restricting portion. In other words, end surface portion 222 serves as a slide restricting portion.

[0042] With the gear housing portion 61b fixed to the mounting metal plate 62 and the branch gear 82, the developing electromagnetic clutch 88, and the developing first gear positioned in the thrust direction within the drive device 60, a position H2 of the thrust-regulating end face portion 222 is closer to the developing electromagnetic clutch 88 than an end face position H1 on the connector 200 side of the tooth surface of the branch gear 82. This prevents the connector 200 from colliding with the branch gear 82 even if an external force is applied in the Y direction as indicated by the arrow A when inserting or removing the harness connector into or from the connector 200.

[0043] In the above basic configuration, when the connector on the device body side is electrically connected to the connector 200, it was found that abnormal noise occurs depending on the configuration of the connector on the device body side. After extensive research into the cause, the following was discovered. Figure 8 is an explanatory diagram of the cause of abnormal noise.

[0044] 8(a) is an explanatory diagram of the sliding structure between the field core 210 and the rotor boss 214. The rotor boss 214 is slidably inserted into the through hole in the center of the field core 210. This is a so-called clearance fit, and a clearance (fitting tolerance) occurs between the two. In the illustrated example, the housing 213 is integral with the output part 211 and is rotatably supported on a shaft that passes through the boss hole of the rotor boss 214.

[0045] A rotor 216 is fixed to the rotor boss 214. The rotor boss 214 and rotor 216 together are referred to as the rotor boss portion. While the housing 213 and the rotor boss portion rotate, the field core 210 does not rotate because it is stopped from rotating by the connector 200. Therefore, the field core 210 rotates while sliding on the rotor boss portion. A connection portion at the tip of a harness 300 is electrically connected to the connector 200.

[0046] In Fig. 8(b), the load from the harness 300 acts on the connector 200 in the axial direction as shown by the arrow B, causing the field core 210 to fall, and the sliding between the field core 210 and the rotor boss portion becomes one-sided contact as shown at point P1, causing a sliding failure. In Fig. 8(c), even when the load from the harness 300 acts on the connector 200 in the opposite axial direction as shown by the arrow C, one-sided contact and a sliding failure occurs as shown at point P2.

[0047] The uneven contact has not been resolved with known technologies, and the increased load caused by poor sliding results in poor durability and loss. In addition, the uneven contact causes vibrations in the sliding part, and the vibrating connector hits the anti-rotation member, generating abnormal noise.

[0048] 9 is an explanatory diagram showing an example of how a load is applied to a harness. For example, assume that a clamp 310 and a bind 311 are located directly below the connector 200. The clamp 310 is for fixing the harness 300 to a bracket made of a metal plate or the like. The bind 311 is for bundling the cords that make up a plurality of harnesses. The clamp 310 and the bind 311 are for preventing the connection part of the tip of the harness 300 from coming off the connector 200 and for preventing the harness 300 from moving so that it does not hit a rotating body such as a gear. The bind 311 can also be provided on the other side of the clamp 310.

[0049] When the harness 300 is held in a state where the harness 300 has stiffness D due to the binding 311 being caught by the clamp 310, a force is applied in the axial direction to the field core 210 via the connector 200. In other words, the harness 300, which is a connection part on the device main body side that is electrically connected to the connector 200 as a current-carrying part, applies an external force to the connector 200 in an electrically connected state, causing the connector 200 to fall against the rotor boss part of the field core 210. When such an external force is applied, one-sided contact as described with reference to Figures 8(a) and 8(b) can occur.

[0050] Therefore, in this embodiment, a fall suppression part is provided that engages with the connector 200 to suppress the fall of the field core 210 relative to the rotor boss part. This fall suppression part regulates the connector 200 from tilting in the fall direction, and prevents the field core 210 from falling, which would cause a sliding failure.

[0051] [Configuration Example 1] Fig. 10 is an explanatory diagram of a configuration example of a fall prevention section. In this configuration example 1, one side of the end face of the anti-rotation opening 220 of the connector 200 formed in the gear housing part 61b in the direction in which the connector 200 falls is restricted to a position that keeps the connector 200 horizontal. Keeping it horizontal here means keeping it in a position parallel to an imaginary plane PL perpendicular to the rotor boss 214, as shown in Fig. 8(a). For this restriction, a housing part 320 that forms the end face of the anti-rotation opening 220 on the lower side in the figure is added to the basic configuration in Fig. 7.

[0052] Then, on the side opposite to the direction in which the connector 200 may fall, the vibration-damping material 321 is sandwiched between the end face of the gear housing portion 61b and the connector 200 to prevent the connector from falling. In the illustrated example, the vibration-damping material 321 is provided on the upper side in the figure. Conversely, as shown in Fig. 11, the vibration-damping material 321 may be provided on the lower side in the figure.

[0053] 10 and 11, in the illustration of the anti-rotation opening 220, the end face portion of the upper gear housing portion 61b and the additional housing portion 320 correspond to a facing portion that faces the connector 200 from a direction in which the connector 200 may fall, and the vibration-damping material 321 corresponds to a biasing portion that biases the connector 200 toward the facing portion. The biasing portion is provided between the facing portions on one side and the other side in the above-mentioned direction, and is preferably thicker than the gap between the facing portions with the current-carrying portion therebetween.

[0054] [Configuration Example 2] Fig. 12 is an explanatory diagram of another example of the configuration of the collapse prevention section. Instead of the vibration-damping material 321 in Fig. 11, a resin material having flexibility or elasticity is used. The example shown in the figure uses a PET (polyethylene terephthalate) plate 322. The fixed end is fixed to the upper gear housing part 61b (Fig. 12(a)) or the additional housing part 320 (Fig. 12(b)) by adhesion or the like, and the free end side that is bent and extends biases the connector 200.

[0055] [Configuration Example 3] FIG. 13 is an explanatory diagram of yet another example of the configuration of the fall prevention unit. The force is applied by a PET plate 323 that is attached in a direction 90° different from the PET plate 322 in FIG. 12. FIG. 12 is an explanatory diagram of a state in which the developing electromagnetic clutch 88 is not attached. The surface of the PET plate 323 that abuts against the connector 200 and applies force is inclined so that it faces upward so that the connector 200 inserted into the rotation prevention opening 220 can be applied in the figure. The ridge of the bend has an angle with respect to the rotor boss 214. It may also be inclined so that the force is applied downward, the opposite of that shown in the figure. The resin plate in FIG. 12 or FIG. 13 is less expensive than the vibration-damping material in FIG. 10 or FIG. 11.

[0056] [Configuration Example 4] 14 is an explanatory diagram of yet another example of the configuration of the fall prevention portion. In this configuration, the connector 200 is lightly press-fitted into the upper and lower opening end faces of the anti-rotation opening 220 in the figure. This makes it possible to reduce the number of additional parts.

[0057] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the spirit of the present invention described in the claims, unless otherwise specifically limited in the above description.

[0058] 15 shows an example in which a conductive elastic member 360 as described in Patent Document 1 is elastically abutted against a current-carrying part 350 integrally provided with a field core 210 for electrical connection. Even in this example, there is a risk of abnormal noise being generated due to the rotor boss 214 falling over, and the present invention can be applied as a countermeasure to this problem.

[0059] Furthermore, while the above embodiment suppresses tilt from both sides in the tilt direction of the rotor boss 214, the connection portion on the device main body side which is electrically connected to the current-carrying portion may have an abutment portion which resists an external force applied to the current-carrying portion when electrically connected and abuts against the current-carrying portion only from the side opposite to the external force in the direction in which the tilt may occur.

[0060] Furthermore, the effects described in the embodiments of the present invention are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments of the present invention.

[0061] The above description is merely an example, and each of the following aspects has its own unique effects. In the description of the aspects, the reference characters in parentheses following the names of components indicate examples of the corresponding members, and the present invention is not limited to these examples. (Aspect 1) In a drive transmission device having an electromagnetic clutch (88) with an integrated current-carrying part (200), the current-carrying part (200) is integrated with a field core (210), and a connection part on the device body side electrically connected to the current-carrying part (200) applies an external force to the current-carrying part (200) in an electrically connected state, and has a tilt suppression part (321, 320, 322, 323) that engages with the current-carrying part (200) to suppress tilt of the field core (210) against a rotor boss part due to the external force. This makes it possible to suppress the generation of abnormal noise.

[0062] (Aspect 2) In the drive transmission device according to the first aspect, the fall suppression part has a facing part (320, 222) facing the current-carrying part (200) from one side of the direction in which the fall may occur, and a biasing part (321, 322, 323) biasing the current-carrying part (200) toward the facing part from the other side of the direction in which the fall may occur. This makes it possible to suppress the fall by engaging with the step part from both sides of the direction in which the fall may occur.

[0063] (Aspect 3) The drive transmission device according to aspect 2 has a facing portion (320, 222) facing the current-carrying portion (200) from the other side of the direction, and the biasing portion is a vibration-damping material (321) provided between the facing portions (222a, 320) on one side and the other side of the direction and having a thickness greater than the gap between the facing portions with the current-carrying portion (200) sandwiched therebetween. This makes it possible to prevent the vibration-damping material (321) from falling by the elastic force of the vibration-damping material (321).

[0064] (Aspect 4) In the drive transmission device according to aspect 2, the biasing portion is made of a flexible or elastic resin material (322, 323), which can be manufactured at low cost.

[0065] (Aspect 5) In the drive transmission device according to aspect 4, the resin material (323) has a plate shape and biases the current-carrying portion (200) toward the opposing portion by a surface that is inclined with respect to the direction in which the tipping may occur.

[0066] (Aspect 6) In the drive transmission device according to aspect 1, the fall suppression portion (321, 320, 322, 323) has a contact portion that contacts the current-carrying portion (200) against the external force in a direction in which the fall may occur. This makes it possible to suppress the fall by a contact force that balances with the external force.

[0067] (Aspect 7) In the drive transmission device according to the first aspect, the fall prevention portion is structured to lightly press-fit the current-carrying portion (200) between an opposing portion that faces the current-carrying portion (200) from one of the directions in which the fall may occur and an opposing portion that faces the current-carrying portion (200) from the other of the directions. This makes it possible to reduce the number of additional parts.

[0068] (Aspect 8) In the drive transmission device according to any one of the first to sixth aspects, the possibility of the tilt occurs due to a gap between the field core (210) and the rotor boss portion.

[0069] (Aspect 9) A drive device (60) including a drive source and the drive transmission device according to any one of aspects 1 to 8. With this, the effects described in aspects 1 to 8 can be obtained in the drive device.

[0070] (Aspect 10) An image forming apparatus including the drive device according to aspect 9. With this, the effects described in aspects 1 to 8 can be obtained in the image forming apparatus. [Explanation of symbols]

[0071] 1: Photoreceptor 2: Cleaning blade 4: Charging roller 7: Latent image writing device 8: Developing device 8a: Developing roller 9: Toner cartridge 10: Transfer roller 30: Manual feed section 31: Manual feed tray 32: Manual feed roller 33: Separation pad 41: Main body feed roller 42: Relay roller pair 43: Registration roller pair 44: Fixing device 44a: Fuser roller 44b: Pressure roller 46: Paper ejection roller pair 47: Switching claw 48: Separation pad 50: Main unit 60: Drive unit 61: Plastic housing 61a: Motor housing part 61b: Gear housing part 62: Mounting plate 63: Drive motor 63a: Motor shaft 63b: Motor bracket 71: First input gear 72: Idler gear 73: Photoconductor gear 74: Photoconductor drive shaft 75: Photoconductor coupling 81: Second input gear 82: Branch gear 83: Paper feed gear 83a: First paper feed gear section 83b:Second paper feed gear section 84: Resist First Gear 85: Resist electromagnetic clutch 86: Resist 2nd Gear 87: Resist output gear 88: Development electromagnetic clutch 89: First gear for development 90: Development drive transmission member 90a: Coupling part 90b: Development gear part 100: Paper feed cassette 200: Connector 201: Connector case 202: Pin 210: Field Core 211: Output section 212: Transmission claw 213: Housing 214: Rotor boss 215: Boss hole 216: Rotor 220: Anti-rotation opening 221: Both sides of the opening 222: End face part 230: Paper feed drive unit 300: Harness 310: Clamp 311: Bind 320: Housing part 321: Vibration damping material 322:PET board 323:PET board 350: Electrical part 360: Elastic member A: Arrow B: Arrow C: Arrow D: Firmness H1: End face position P1: Point P2: Point PL: Virtual plane R1: Main feed path R2: Manual feed path R3: Common transport route R4: Paper ejection path R5: Reverse retransmission path S: Recording sheet [Prior art documents] [Patent documents]

[0072] [Patent Document 1] JP 2003-142852 A

Claims

1. In a drive transmission device having an electromagnetic clutch with an integrated current-carrying part, The conductive portion is integral with the field core, a connection portion on the device body side that is electrically connected to the electric current conducting portion applies an external force to the electric current conducting portion in an electrically connected state; a tilt suppression portion that engages with the current-carrying portion to suppress tilt of the field core relative to a rotor boss portion due to the external force, the tilt suppression portion comprising: a rotor core;

2. 2. The drive transmission device according to claim 1, A drive transmission device characterized in that the collapse prevention portion has an opposing portion that faces the conductive portion from one of the directions in which the collapse may occur, and a biasing portion that biases the conductive portion toward the opposing portion from the other of the directions.

3. 3. The drive transmission device according to claim 2, a facing portion facing the current-carrying portion from the other side of the direction, A drive transmission device characterized in that the biasing portion is a vibration-damping material provided between opposing portions in one and the other direction and has a thickness greater than the gap between the opposing portions and sandwiching the conductive portion therebetween.

4. 3. The drive transmission device according to claim 2, The drive transmission device according to claim 1, wherein the biasing portion is made of a resin material having flexibility or elasticity.

5. 5. The drive transmission device according to claim 4, The drive transmission device is characterized in that the resin material has a plate shape and biases the current-carrying portion toward the opposing portion by a surface that is inclined with respect to a direction in which the tipping may occur.

6. 2. The drive transmission device according to claim 1, The drive transmission device, wherein the collapse prevention portion has a contact portion that contacts the current-carrying portion against the external force in a direction in which the collapse may occur.

7. 2. The drive transmission device according to claim 1, A drive transmission device characterized in that the collapse prevention portion has a structure in which the conductive portion is lightly pressed between an opposing portion that faces the conductive portion from one direction in which the collapse may occur and an opposing portion that faces the conductive portion from the other direction.

8. 2. The drive transmission device according to claim 1, a rotor boss portion having a first end and a second end, the first end being connected to the rotor boss portion by a first end of the rotor boss portion;

9. A drive device comprising the drive transmission device according to any one of claims 1 to 8 and a drive source.

10. An image forming apparatus comprising the drive device according to claim 9.

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