JP5082594B2 - Driving force transmission device and image forming apparatus - Google Patents

Description

  The present invention relates to a driving force transmission device and an image forming apparatus.

  2. Description of the Related Art Conventionally, in an image carrier driving apparatus configured to be attachable to and detachable from an image forming apparatus main body having a plurality of image carriers, a technique for easily assembling driving components and adjusting an angle and suppressing color misregistration and density unevenness are conventionally used (See, for example, Patent Document 1). In Patent Document 1, an image carrier driving device including a drive train that transmits a driving force from a driving source to the plurality of image carriers to drive a developing device disposed in a main body of an image forming apparatus. A configuration in which the development drive train is arranged in the image carrier driving apparatus is disclosed.

JP 2005-189482 A

Here, when a plurality of members, such as gears, that transmit driving force reach the driven body in the housing and are attached to the apparatus main body side, care must be taken not to hit the plurality of members against the housing. . Even if such attention is paid, a plurality of members may hit the casing and be damaged. If a plurality of members are damaged, the quality of drive transmission is degraded. In addition, if the number of members to be attached at a time is large, the assembly workability is deteriorated by working with such care.
An object of the present invention is to provide a driving force transmission device and an image forming apparatus that can improve the assembly workability of a drive transmission member.

For this purpose, a driving force transmission device to which the present invention is applied has a driving transmission unit that transmits the driving force, and a wall that extends in a direction intersecting the direction in which the driving transmission unit transmits the driving force. A structural member having a hole for passing the drive transmission part through the wall part, and a peripheral member attached to a peripheral edge of the hole of the structural member, and the drive transmission part is While being assembled through between the peripheral members attached to the structural member, the peripheral members are disengaged after the assembly is completed.
The driving force transmission device to which the present invention is applied includes a plurality of drive transmission units arranged in parallel to transmit the driving force, and a wall portion extending in a direction intersecting the direction in which the plurality of drive transmission units transmit the driving force. It has, seen containing a structural member having a plurality of holes for the passage of each of the plurality of drive transmitting portion to said wall portion, and a peripheral member mounted on the periphery of the plurality of holes of the structural members, the said The plurality of drive transmission parts are assembled through the gap between the peripheral members attached to the structural member at the time of assembly, and are disengaged from the peripheral members after the assembly is completed. It is.

Here, it may further include an attachment member that holds the drive transmission portion and is attached to the wall portion of the structural member. In addition, the peripheral member can hold the drive transmission unit rotatably when the drive transmission unit transmits a driving force.
Here, the structure may further include an attachment member that integrally holds the plurality of drive transmission portions and is attached to the wall portion of the structural member. In addition, the peripheral member may be characterized in that the plurality of drive transmission units are rotatably held when each of the plurality of drive transmission units transmits a driving force. Further, each of the plurality of drive transmission parts has a smaller diameter than the held part so that a gap is formed between the held part rotatably held by the peripheral member and the peripheral member. And a connection portion connected to another member. Further, the plurality of drive transmission portions may be engaged with the peripheral member during assembly to advance through the holes, and are disengaged from the peripheral member after the assembly is completed. . The peripheral member may be formed of a material having a lower hardness than the plurality of drive transmission units, and may be a protective member that protects the plurality of drive transmission units during assembly.

Further, from another viewpoint, the image forming apparatus to which the present invention is applied includes an image holding body that can form an electrostatic latent image and is rotatable, and a rotatable rotating member, and the image holding body. A developing unit that develops the electrostatic latent image formed with a developer, a driving source, the driving source and the image holding body and / or the developing unit, and a hole is provided. A housing having a housing, a drive transmission unit that is disposed through the hole in the housing and transmits the driving force of the driving source to the image carrier and / or the developing device, and a peripheral edge of the hole in the housing A peripheral member attached to the housing, and the drive transmission portion is assembled through the peripheral member attached to the housing at the time of assembly, but is not engaged with the peripheral member after completion of the assembly. It is characterized by becoming a state.
An image forming apparatus to which the present invention is applied includes a plurality of rotatable image holding members and a rotatable rotating member on which an electrostatic latent image is formed, and a static image formed on each of the plurality of image holding members. A plurality of developing units for developing the electrostatic latent image with a developer; a driving source; and the driving source and the plurality of image holders and / or the plurality of developing units, and a plurality of developing units. A plurality of drives arranged in parallel through the plurality of holes of the casing and transmitting the driving force of the driving source to the plurality of image carriers and / or the plurality of developing devices. a transmission unit, the said plurality of peripheral member attached to the periphery of the hole of the housing, only containing the plurality of drive transmitting portion, during assembly between the peripheral edge members attached to the housing While being assembled through, it is not engaged with the peripheral member after the assembly is completed Those characterized by comprising.

Here, it may further include an attachment member that holds the drive transmission unit and is attached to the housing. Further, the peripheral member may be characterized in that the drive transmission unit is rotatably held when the drive transmission unit transmits a driving force.
Here, the apparatus may further include an attachment member that integrally holds the plurality of drive transmission units and is attached to the housing. In addition, the peripheral member may be characterized in that the plurality of drive transmission units are rotatably held when each of the plurality of drive transmission units transmits a driving force. Further, each of the plurality of drive transmission parts has a smaller diameter than the held part so that a gap is formed between the held part rotatably held by the peripheral member and the peripheral member. And a connection portion connected to another member. The peripheral member may be formed of a material having a lower hardness than the plurality of drive transmission units, and may be a protective member that protects the plurality of drive transmission units during assembly. In addition, it may further include a shaft joint that detachably couples the drive source and the plurality of drive transmission units.

According to the first aspect, it is possible to reduce the performance level required by the peripheral member as compared with the case where the present invention is not applied.
According to claim 2, it is possible to further improve the assembly workability of the drive transmission unit.
According to the third aspect, the drive transmission unit can perform more stable drive transmission.
According to the fourth aspect, it is possible to reduce the performance level required for the peripheral member as compared with the case where the present invention is not applied .
According to claim 5, allowing Rukoto further improve the assembling workability of the driving force transmitting portion of the multiple.
According to the sixth aspect, the drive transmission unit can perform more stable drive transmission .
According to the seventh aspect, more stable drive transmission of the drive transmission unit can be realized with a simple configuration .
According to the eighth aspect, it is possible to reduce the performance level required for the peripheral member as compared with the case where the present invention is not applied .
According to claim 9, allowing Rukoto further improve the assembling workability of the driving force transmitting portion.
According to the tenth aspect, more stable drive transmission of the drive transmission unit is possible.
According to the eleventh aspect, it is possible to reduce the performance level required for the peripheral member as compared with the case where the present invention is not applied .
According to the twelfth aspect, it is possible to further improve the assembly workability of the plurality of drive transmission units.
According to the thirteenth aspect, more stable drive transmission of the drive transmission unit is possible.
According to the fourteenth aspect, more stable drive transmission of the drive transmission unit can be realized with a simple configuration .

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram showing an image forming apparatus according to the present embodiment. The image forming apparatus shown in FIG. 1 is a so-called tandem type image forming apparatus, for example, a plurality of image forming units 10 (10Y, 10M, 10C, 10K) on which toner images of respective color components are formed by electrophotography. And an endless intermediate transfer belt (toner image holder) 15 for sequentially transferring (primary transfer) and holding each color component toner image formed by each image forming unit 10, and transferring the toner image onto the intermediate transfer belt 15. A secondary transfer device 20 that collectively transfers (secondary transfer) the superimposed image to a sheet P as a transfer material, and a fixing device 30 that fixes the secondary transferred image on the sheet P are provided. Moreover, it has the control part 40 which controls operation | movement of each apparatus (each part).

In this embodiment, each image forming unit 10 (10Y, 10M, 10C, 10K) is provided with an electrophotographic device around the photosensitive drums 11Y, 11M, 11C, 11K rotating in the direction of arrow A. Yes. That is, the charger 12 that charges the photosensitive drums 11Y, 11M, 11C, and 11K, and the laser exposure unit 13 that writes an electrostatic latent image on the photosensitive drums 11Y, 11M, 11C, and 11K (FIG. 1). The developing beams 14Y, 14M, 14C, and the like, each of the color component toners is accommodated and the electrostatic latent images on the photosensitive drums 11Y, 11M, 11C, 11K are visualized with toner. 14K. Further, the primary transfer roll 16 that transfers the color component toner images formed on the photosensitive drums 11Y, 11M, 11C, and 11K to the intermediate transfer belt 15, and the residual toner on the photosensitive drums 11Y, 11M, 11C, and 11K A drum cleaner 17 to be removed is disposed.
These image forming units 10Y, 10M, 10C, and 10K are arranged in order of yellow (Y color), magenta (M color), cyan (C color), and black (K color) from the upstream side of the intermediate transfer belt 15. ing.

  The intermediate transfer belt 15 as an intermediate transfer member is a film-like endless belt in which an appropriate amount of a conductive agent such as carbon black is contained in a resin such as polyimide or polyamide. The intermediate transfer belt 15 can be circulated and rotated (rotated) at a predetermined speed in the direction of arrow B shown in FIG. 1 by various rolls. As these various rolls, there are provided a drive roll 31 that is driven by a motor (not shown) to rotate the intermediate transfer belt 15 and a function of giving a constant tension to the intermediate transfer belt 15 and preventing meandering of the intermediate transfer belt 15. Tension roll 32. As other various rolls, there are a driven roll 35 that supports the intermediate transfer belt 15 and applies a constant tension, and a backup roll (support roll) 28 provided in a secondary transfer portion.

  In the module 18 provided opposite to the photosensitive drums 11Y, 11M, 11C, and 11K, each primary transfer roll 16 provided on the inner side of the intermediate transfer belt 15 that extends substantially linearly has a reverse polarity to the charging polarity of the toner. Polarity voltage is applied. Thus, the toner images on the respective photosensitive drums 11Y, 11M, 11C, and 11K are sequentially electrostatically attracted to the intermediate transfer belt 15, and a superimposed toner image is formed on the intermediate transfer belt 15. .

  The secondary transfer device 20 includes a secondary transfer roll 22 disposed on the toner image holding surface side of the intermediate transfer belt 15 and a backup roll 28 as an opposite roll. That is, the secondary transfer roll 22 is disposed in pressure contact with the backup roll 28 with the intermediate transfer belt 15 interposed therebetween. By the secondary transfer device 20 configured as described above, the visible image that has been multiple-transferred onto the intermediate transfer belt 15 is transferred to the paper P that is conveyed to the secondary transfer position at a predetermined timing. When the secondary transfer is performed at the secondary transfer position, the paper P is conveyed to the fixing device 30.

A belt cleaner 37 that removes residual toner and paper dust on the intermediate transfer belt 15 after the secondary transfer and cleans the surface of the intermediate transfer belt 15 is provided on the downstream side of the backup roll 28 so as to be able to contact and separate. .
On the other hand, on the upstream side of the secondary transfer position in the secondary transfer device 20, a reference sensor (home position sensor) 39 that generates a reference signal serving as a reference for taking the image forming timing in each image forming unit 10 is arranged. ing. The reference sensor 39 recognizes a predetermined mark provided on the back side of the intermediate transfer belt 15 to generate a reference signal, and each image forming unit 10 receives the instruction from the control unit 40 based on the recognition of the reference signal. It is configured to start image formation.
Further, an image density sensor 38 for adjusting image quality is disposed on the downstream side of the black image forming unit 10K.

  Next, a basic image forming process of the image forming apparatus according to the present embodiment will be described. Image data output from an image reading device (IIT) (not shown), a personal computer (PC) (not shown), or the like is input to the image forming apparatus shown in FIG. In the image forming apparatus, after predetermined image processing is performed by an image processing apparatus (IPS) (not shown), an image forming operation is performed by the image forming unit 10 or the like. In the image processing apparatus (IPS), the input reflectance data is subjected to image processing such as shading correction, position shift correction, brightness / color space conversion, gamma correction, frame deletion, color editing, and movement editing. . The image data subjected to the image processing is converted into color material gradation data of four colors of yellow (Y), magenta (M), cyan (C), and black (K), and is output to the laser exposure unit 13. .

In the laser exposure device 13, for example, an exposure beam Bm emitted from a semiconductor laser is applied to the photosensitive drums 11Y, 11M, 11C of the image forming units 10Y, 10M, 10C, 10K according to the input color material gradation data. , 11K. In the photosensitive drums 11Y, 11M, 11C, and 11K of the image forming units 10Y, 10M, 10C, and 10K, the surface is charged by the charger 12, and then the surface is scanned and exposed by the laser exposure unit 13, thereby electrostatic latent images. Is formed. The formed electrostatic latent image is developed as a toner image of each color of yellow, magenta, cyan, and black in each of the image forming units 10Y, 10M, 10C, and 10K.
The toner images formed on the photosensitive drums 11Y, 11M, 11C, and 11K of the image forming units 10Y, 10M, 10C, and 10K are in contact with the photosensitive drums 11Y, 11M, 11C, and 11K and the intermediate transfer belt 15. The image is transferred onto the intermediate transfer belt 15 at the primary transfer portion. More specifically, in the primary transfer portion, the primary transfer roll 16 applies a voltage having a polarity opposite to the charged polarity of the toner to the base material of the intermediate transfer belt 15, and the unfixed toner image is transferred to the surface of the intermediate transfer belt 15. Are sequentially superposed on each other to perform primary transfer. The unfixed toner image primarily transferred in this way is conveyed to the secondary transfer device 20 as the intermediate transfer belt 15 rotates.

In the secondary transfer device 20, the secondary transfer roll 22 is pressed against the backup roll 28 in a state where the intermediate transfer belt 15 is sandwiched therebetween in accordance with the timing of the secondary transfer onto the paper P. At this time, the sheet P conveyed at the same timing is sandwiched between the intermediate transfer belt 15 and the secondary transfer roll 22. An unfixed toner held on the intermediate transfer belt 15 at a secondary transfer position where a transfer electric field is formed as a counter electrode on the secondary transfer roll 22 and pressed by the secondary transfer roll 22 and the backup roll 28. The image is electrostatically transferred onto the paper P.
Thereafter, the sheet P on which the toner image has been electrostatically transferred is conveyed as it is while being peeled off from the intermediate transfer belt 15 by the secondary transfer roll 22. Then, the speed is changed in accordance with the optimum transport speed in the fixing device 30, and the paper P is transported to the fixing device 30. The unfixed toner image on the paper P is fixed on the paper P by being subjected to a fixing process by heat and pressure by the fixing device 30. The paper P on which the fixed image is formed is discharged to the outside of the apparatus by a discharge roll (not shown).
On the other hand, after the transfer to the paper P is completed, the residual toner remaining on the intermediate transfer belt 15 is conveyed to the cleaning unit as the intermediate transfer belt 15 rotates, and is removed from the intermediate transfer belt 15 by the belt cleaner 37. Removed.

[First Embodiment]
FIG. 2 is a schematic plan view for explaining the relationship between the rear frame 50 and the assembly 60 in the first embodiment. FIG. 3 is a perspective view of the protection member 51. 4 is a perspective view of the rotating member 70K of the assembly 60 as viewed from the inside of the rear frame (housing, structural member, wall) 50. FIG.
As shown in FIG. 2, the rear frame 50 as a housing is a metal plate-like member disposed on the rear side (the back side in the direction of the arrow in FIG. 1) of the image forming apparatus, and includes a protective member (peripheral edge). Member) 51 is fitted and attached.

  As shown in FIG. 3, the protection member 51 is a cylindrical member having a flange portion 51c, and is a resin molded product such as polyamide. The cylindrical inner peripheral surface 51a of the protection member 51 corresponds to the outer dimensions of intermediate members 74Y, 74M, 74C, and 74K of rotating members (drive transmission units and delivery units) 70Y, 70M, 70C, and 70K, which will be described later. It is formed into a shape. As a result, the protection member 51 has a bearing function for rotatably holding intermediate members 74Y, 74M, 74C, and 74K of rotation members 70Y, 70M, 70C, and 70K described later on the inner peripheral surface 51a.

  The cylindrical outer peripheral surface 51b of the protection member 51 is formed in a shape corresponding to mounting holes 50a and 50b of the rear frame 50 described later. And the protection member 51 is press-fitted and attached to the attachment holes 50a and 50b.

  Here, as shown in FIG. 2, the flange portion 51 c of the protection member 51 is located on the outer surface 50 d side of the rear frame 50. Further, as shown in FIG. 4, an output side gear 73 </ b> K of a rotating member 70 </ b> K, which will be described later, protrudes from the protective member 51.

  As shown in FIG. 2, an assembly (unit, assembly) 60 is attached to the rear frame 50. The assembly 60 includes a bracket (attachment member) 61, a drive gear 62a on an output shaft, a drive motor (drive source) 62 controlled by the control unit 40, and developing devices 14Y and 14M as driven bodies. , 14C, 14K (refer to FIG. 1), a rotating member (delivery member) 70 (70Y, 70M, 70C, 70K) for delivering the power of the drive motor 62 to the driven body, and driving of the drive motor 62 A two-stage gear member 63 that is engaged with the gear 62a and transmits a driving force. In the present embodiment, the developing devices 14Y, 14M, 14C, and 14K are described as driven bodies. In addition, the photosensitive drums 11Y, 11M, 11C, and 11K (see FIG. 1) are used in the present embodiment. A driven body in the form is also conceivable.

Each of the rotating members 70Y, 70M, 70C, and 70K is rotatable to the shaft portions 71Y, 71M, 71C, and 71K whose one end portions are attached to the bracket 61 by caulking and the shaft portions 71Y, 71M, 71C, and 71K. And input side gears 72Y, 72M, 72C, 72K to be attached. That is, the rotating members 70Y, 70M, 70C, and 70K are integrally attached to the bracket 61. In addition, the two-stage gear member 63 and the gears 64 and 65 are attached to the bracket 61 in addition to the rotating members 70Y, 70M, 70C, and 70K.
Here, the gear 64 meshes with (engages with) the input side gear 72Y and also meshes with the input side gear 72M. Further, the gear 65 meshes with the input side gear 72C and also meshes with the input side gear 72K.

Further, each of the rotating members 70Y, 70M, 70C, and 70K includes metal output side gears (connection portions) 73Y, 73M, 73C, and 73K that are rotatably attached to the shaft portions 71Y, 71M, 71C, and 71K, and outputs. Intermediate members (held parts) 74Y, 74M, 74C, 74K positioned between the side gears 73Y, 73M, 73C, 73K and the input side gears 72Y, 72M, 72C, 72K. Here, the intermediate members 74Y, 74M, 74C, and 74K are resin molded products such as polyacetal, and are engaged with the inner peripheral surface 51a of the protective member 51 and held rotatably.

  The two-stage gear member 63 includes a large-diameter gear 63a and a small-diameter gear 63b that are disposed coaxially with each other. The large diameter gear 63 a meshes with the drive gear 62 a of the drive motor 62. Further, the small diameter gear 63b meshes with the input side gear 72M of the rotating member 70M and also meshes with the input side gear 72C of the rotating member 70C.

  In the assembly 60 configured as described above, when the drive motor 62 operates under the control of the control unit 40, the driving force of the drive motor 62 is changed from the drive gear 62a of the drive motor 62 to the two-stage gear via the large diameter gear 63a. The two-stage gear member 63 is rotated and transmitted to the member 63. Then, the input side gear 72M and the input side gear 72C engaged with the small diameter gear 63b of the two-stage gear member 63 are rotationally driven. Then, the driving force transmitted to the input side gear 72M is transmitted from the gear 64 to the input side gear 72Y. The driving force transmitted to the input side gear 72C is transmitted from the gear 65 to the input side gear 72K. As described above, the intermediate members 74Y, 74M, 74C, and 74K of the rotating members 70Y, 70M, 70C, and 70K are rotatably held by the protection member 51. Therefore, when the driving force of the driving motor 62 is transmitted to each of the input side gears 72Y, 72M, 72C, 72K, each of the output side gears 73Y, 73M, 73C, 73K of the rotating members 70Y, 70M, 70C, 70K. Is driven to rotate. In this manner, the developing devices 14Y, 14M, 14C, and 14K (see FIG. 1) connected to the output side gears 73Y, 73M, 73C, and 73K are rotationally driven by the driving force of the drive motor 62.

FIG. 5 is a perspective view illustrating the attachment state of the rotating member 70K as viewed from the rear frame 50. As shown in FIG. In FIG. 5, the rotating member 70K is illustrated, but the other rotating members 70Y, 70M, and 70C have the same structure as the rotating member 70K, and thus illustration and description thereof are omitted.
As shown in FIG. 5, the rotating member 70 </ b> K held by the protection member 51 is attached with the shaft portion 71 </ b> K protruding from the protection member 51 and supported by the support member 52. The support member 52 is attached to the rear frame 50 on the inner surface 50 c side of the rear frame 50.

Here, the shaft portion 71 </ b> K of the rotating member 70 </ b> K is held by the support member 52. Accordingly, the rotating member 70K is supported at both ends. That is, as described above, one end of the shaft portion 71K is attached to the bracket 61 by caulking, and the other end is attached to the rear frame 50 via the support member 52.
A rotating shaft 11a of the photosensitive drum 11K (see FIG. 1) is disposed around the support member 52 in the rear frame 50, and a rotating shaft of the drum cleaner 17 (see FIG. 1) of the photosensitive drum 11K. 17a is disposed.

FIG. 6 is a schematic diagram for explaining the relationship between the mounting holes 50 a and 50 b formed in the rear frame 50 and the protective member 51.
As shown in FIG. 6, the rear frame 50 is formed with one mounting hole 50a and three mounting holes 50b. The attachment holes 50a and 50b are arranged at a predetermined interval. The mounting hole 50a has a round hole shape, and the mounting hole 50b has a long hole shape. The protection member 51 is fitted in the mounting holes 50a and 50b so as to cover the peripheral portions of the mounting holes 50a and 50b.

FIG. 7 is a schematic plan view for explaining an operation of assembling the assembly 60 with the rear frame 50.
As shown in FIG. 7, in order to assemble the assembly 60 on the rear frame 50, it is necessary to move the assembly 60 in the direction of the arrow X with respect to the rear frame 50. That is, the rotating members 70Y, 70M, 70C, and 70K of the assembly 60 are passed through the mounting holes 50a and 50b of the rear frame 50 to the developing devices 14Y, 14M, 14C, and 14K (refer to FIG. 1) that are driven members inside the apparatus. It needs to be reached. More specifically, the output side gear 73Y is passed through the mounting hole 50b, the output side gear 73M is passed through the mounting hole 50b, the output side gear 73C is passed through the mounting hole 50b, and the output side gear 73K is passed through the mounting hole 50a. It is necessary to perform the assembly work at once.
Here, a protective member 51 for preventing the output side gears 73Y, 73M, 73C, 73K from coming into contact with the rear frame 50 during assembly work is fitted in each of the mounting holes 50a, 50b of the rear frame 50. Attached. And the protection member 51 is a resin molded product, and its hardness is lower than the metal output side gears 73Y, 73M, 73C, 73K.

  When the assembly 60 is advanced in the X direction of the rear frame 50, the output side gears 73Y, 73M, 73C, 73K are inserted into the cylindrical portion of the protective member 51, and thereafter, from the output side gears 73Y, 73M, 73C, 73K. Also, intermediate members 74Y, 74M, 74C, and 74K having large diameters (see FIG. 2) are inserted. The intermediate members 74Y, 74M, 74C, and 74K are held by the inner peripheral surface 51a of the protection member 51.

  Further, the mounting holes 50a of the rear frame 50 are round holes, while the three mounting holes 50b have a long hole shape. Therefore, the rotating members 70Y, 70M, 70C, and 70K of the assembly 60 serve as the protective member 51. When inserting, the position of the protection member 51 is adjusted.

FIGS. 8A to 8D and FIG. 9 are diagrams for explaining the protection members 53, 54, 55, and 56 according to the modification.
The protection member 53 shown in FIG. 8A includes a snap fit portion 53d, and is attached by engaging the snap fit portion 53d with the mounting hole 50a of the rear frame 50. The protection member 54 shown in FIG. 8B is attached by screwing. That is, a screw hole 50e is formed adjacent to the attachment hole 50a of the rear frame 50, and the protective member 54 is attached to the rear frame 50 by engaging the screw 54d with the screw hole 50e.

  Further, the protective member 55 shown in FIG. 8C includes a snap fit portion 55d, and is attached by engaging the snap fit portion 55d with a plurality of mounting holes 50f of the rear frame 50. The plurality of attachment holes 50f are formed adjacent to the attachment holes 50a.

The protective member 56 shown in FIG. 8D includes a snap fit portion 56d and a harness guide portion 56e. The snap fit portion 56d is attached by engaging with the attachment hole 50a of the rear frame 50. The harness guide portion 56e is fitted into a hole 50g formed adjacent to the mounting hole 50a of the rear frame 50.
As shown in FIG. 9, the protection member 56 includes a harness guide portion 56e for allowing various harnesses to pass therethrough.

[Second Embodiment]
FIG. 10 is a schematic plan view for explaining the relationship between the rear frame 50 and the assembly 80 in the second embodiment. In addition, about the same structure part as 1st Embodiment, the same code | symbol is used and the description may be abbreviate | omitted.
An assembly 80 shown in FIG. 10 includes a drive transmission body 60A that transmits an input driving force to a driven body, a driving body 80A that includes a driving source, and a driving transmission force of the driving source of the driving body 80A. And a shaft joint (coupling) 82 for inputting to the input.

  The drive transmission body 60A has substantially the same configuration as the assembly 60 according to the first embodiment. That is, the drive transmission body 60A is connected to the bracket 61 and the developing devices 14Y, 14M, 14C, and 14K (refer to FIG. 1) as driven bodies to transfer the driving force of the driving motor 62 to the driven bodies. The rotating member 70 (70Y, 70M, 70C, 70K) and the small-diameter gear 63b and the gears 64, 65 for transmitting the driving force from the driving source to the rotating members 70Y, 70M, 70C, 70K are provided.

  The drive body 80A includes a bracket 81, a drive gear 62a on the output shaft, and is driven by being engaged with a drive motor (drive source) 62 controlled by the control unit 40 and the drive gear 62a of the drive motor 62. A large-diameter gear 63a to which force is transmitted.

  The large diameter gear 63a of the drive body 80A and the small diameter gear 63b of the drive transmission body 60A are connected to each other by a shaft joint 82. For this reason, the driving force of the drive motor 62 is transmitted to the drive transmission body 60 </ b> A via the shaft joint 82.

FIG. 11 is a schematic plan view for explaining an assembly operation to the rear frame 50.
As shown in FIG. 11, first, the drive transmission body 60 </ b> A is attached to the rear frame 50. Since the drive transmission body 60A is not attached with the drive motor 62 (see FIG. 10), the operator assembles the drive transmission body 60A that is lighter than the assembly 60 of the first embodiment. Will work. Thereafter, an operation of attaching the driving body 80A shown in FIG. 10 to the rear frame 50 is performed.

[Third Embodiment]
FIG. 12 is a schematic plan view for explaining the relationship between the rear frame 50 and the assembly 90 in the third embodiment. In addition, about the same structure part as 1st Embodiment, the same code | symbol is used and the description may be abbreviate | omitted.
An assembly 90 shown in FIG. 12 includes a drive transmission body 60A that transmits an input driving force to a driven body, a driving body 90A that includes a driving source, and a driving transmission force of the driving source of the driving body 90A. And a shaft coupling (coupling) 92 for inputting to the input.

  The drive transmission body 60A has substantially the same configuration as the drive transmission body 60A according to the second embodiment. Here, in each of the intermediate members 74Y, 74M, 74C, and 74K of the rotating members 70Y, 70M, 70C, and 70K, the reduced diameter portions 93Y, 93M, 93C, and 93K whose outer diameters are smaller than those of the other portions. Is formed.

  The drive body 90A has a bracket 91, a drive gear 62a on the output shaft, and is driven by being engaged with a drive motor (drive source) 62 controlled by the control unit 40 and the drive gear 62a of the drive motor 62. A large-diameter gear 63a to which force is transmitted.

FIG. 13 is a schematic plan view for explaining the assembly operation to the rear frame 50. The procedure for attaching the drive body 90A to the rear frame 50 after attaching the drive transmission body 60A to the rear frame 50 is the same as in the case of the second embodiment.
As shown in FIG. 13, when the drive transmission body 60 </ b> A is attached to the rear frame 50, each of the intermediate members 74 </ b> Y, 74 </ b> M, 74 </ b> C, 74 </ b> K of the rotating members 70 </ b> Y, 70 </ b> M, 70 </ b> C, 70 </ b> K It is guided by engaging (sliding) 51a. When the drive transmission body 60A engages with the subframe 94, the reduced diameter portions 93Y, 93M, 93C, and 93K of the intermediate members 74Y, 74M, 74C, and 74K face the inner peripheral surface 51a of the protection member 51, and the intermediate member From the engaged state in which 74Y, 74M, 74C, 74K and the inner peripheral surface 51a of the protection member 51 are engaged with each other, the non-engaged (non-contact) state in which they are not engaged with each other. As described above, in the present embodiment, at the time of assembly, the protective member 51 engages with the intermediate members 74Y, 74M, 74C, and 74K to perform a guide function. 74M, 74C, 74K are not regulated. That is, even if the intermediate members 74Y, 74M, 74C, and 74K are driven to rotate, they do not engage (slide) with the protection member 51.

1 is a schematic configuration diagram illustrating an image forming apparatus according to an exemplary embodiment. It is a schematic plan view for demonstrating the relationship between the rear frame and assembly in 1st Embodiment. It is a perspective view of a protection member. It is the perspective view which looked at the rotation member of the assembly from the inner side of the rear frame. It is the perspective view seen from the inner side of the rear frame explaining the attachment state of a rotating member. It is the schematic for demonstrating the relationship between the attachment hole formed in the rear frame, and a protection member. It is a schematic plan view for demonstrating the operation | work which assembles an assembly body to a rear frame. It is a figure for demonstrating the protection member which concerns on a modification. It is a figure for demonstrating the protection member which concerns on a modification. It is a schematic plan view for demonstrating the relationship between the rear frame and assembly in 2nd Embodiment. It is a schematic plan view for demonstrating the assembly work to a rear frame. It is a schematic plan view for demonstrating the relationship between the rear frame and assembly in 3rd Embodiment. It is a schematic plan view for demonstrating the assembly work to a rear frame.

Explanation of symbols

50 ... rear frame 51, 53, 54, 55, 56 ... protective member, 60, 80, 90 ... assembly, 60A ... drive transmission body, 61, 81, 91 ... bracket, 62 ... drive motor, 63 ... two steps Gear member, 70Y, 70M, 70C, 70K ... Rotating member, 72Y, 72M, 72C, 72K ... Input side gear, 73Y, 73M, 73C, 73K ... Output side gear, 74Y, 74M, 74C, 74K ... Intermediate member, 82 , 92 ... Shaft joint, 80A, 90A ... Driver, 93Y, 93M, 93C, 93K ... Reduced diameter part, 94 ... Subframe

Claims (14)

A drive transmitting part transmit a driving force,
A structural member before SL drive transmission unit has a wall portion extending in a direction intersecting the direction for transmitting a driving force, has a hole for the said wall portion through a person the drive transmitting portion,
A peripheral member mounted on the periphery of the front Symbol hole of the structural member,
Only including,
The drive transmission unit is assembled through the peripheral member attached to the structural member at the time of assembly, and is disengaged from the peripheral member after the assembly is completed. Transmission device. Driving force transmission device according to claim 1 which retains its previous SL drive transmission unit, characterized in that it further comprises an attachment member attached to the wall of the structural member. The peripheral member, the driving force transmission device according to claim 1, before SL drive transmission unit characterized by rotatably holding the person said drive transmitting portion when transmitting a driving force. A plurality of drive transmission units arranged in parallel to transmit the driving force; and
A structural member having a wall portion extending in a direction crossing a direction in which the plurality of drive transmission portions transmit a driving force, and having a plurality of holes for passing each of the plurality of drive transmission portions in the wall portion;
A peripheral member attached to a peripheral edge of the plurality of holes of the structural member;
Including
The plurality of drive transmission parts are assembled through the gap between the peripheral members attached to the structural member at the time of assembly, and are disengaged from the peripheral members after the assembly is completed. Driving force transmission device. The driving force transmission device according to claim 4, further comprising an attachment member that integrally holds the plurality of drive transmission portions and is attached to the wall portion of the structural member . The driving force transmission device according to claim 4, wherein the peripheral member rotatably holds the plurality of drive transmission units when each of the plurality of drive transmission units transmits a driving force. Each of the plurality of drive transmission parts has a smaller diameter than the held part so that a gap is formed between the held part rotatably held by the peripheral member and the peripheral member. The driving force transmission device according to claim 6, comprising a connecting portion connected to the member . An electrostatic latent image is formed, and the image carrier rotatable,
It includes a rotatable rotary member, a developing device you developing an electrostatic latent image formed on the front Symbol image holding member with a developer,
A driving source;
Wherein is arranged so as to partition between the driving source and the front Symbol image carrier and / or pre-Symbol developing device, and a housing having a bore,
Said arranged before SL through a hole of the housing, it transmits the driving force of the driving source before Symbol image carrier and / or pre-Symbol developing device driving force transmitting portion,
A peripheral member mounted on the periphery of the front Symbol hole of the housing,
Only including,
The drive transmission unit is assembled through the gap between the peripheral members attached to the housing during assembly, and is in an unengaged state with the peripheral members after the assembly is completed. apparatus. The image forming apparatus according to claim 8, further comprising a mounting member attached to the housing to hold the previous SL drive transmitting portion. The peripheral member, the image forming apparatus according to claim 8, before SL drive transmission unit, characterized in that the rotatably holding the person said drive transmitting portion when transmitting a driving force. An electrostatic latent image is formed, and a plurality of rotatable image carriers;
A plurality of developing devices, each of which includes a rotatable rotating member, and that develops the electrostatic latent image formed on each of the plurality of image carriers with a developer;
A driving source;
A housing which is arranged so as to partition between the driving source and the plurality of image holding members and / or the plurality of developing devices, and which has a plurality of holes;
A plurality of drive transmission units arranged in parallel through the plurality of holes of the housing and transmitting a driving force of the drive source to the plurality of image holding bodies and / or the plurality of developing units;
A peripheral member attached to the periphery of the plurality of holes of the housing;
Including
The plurality of drive transmission parts are assembled through the gap between the peripheral members attached to the housing during assembly, and are disengaged from the peripheral members after the assembly is completed. Image forming apparatus. The image forming apparatus according to claim 11, further comprising an attachment member that integrally holds the plurality of drive transmission units and is attached to the housing . The image forming apparatus according to claim 11, wherein the peripheral member rotatably holds the plurality of drive transmission units when each of the plurality of drive transmission units transmits a driving force . Each of the plurality of drive transmission parts has a smaller diameter than the held part so that a gap is formed between the held part rotatably held by the peripheral member and the peripheral member. The image forming apparatus according to claim 13, comprising: a connecting portion connected to the member .

Images