JPH0882973A - Color image forming device - Google Patents

Abstract

PURPOSE: To provide a color image forming device capable of forming a color image having a length equal to or above the peripheral length of an image forming body and excellent in color balance and facilitating assembly, exchange and maintenance. CONSTITUTION: As for this color image forming device, a cleaning device 4, four pairs of charging device 5Y, 5M, 5C and 5K and developing devices 6Y, 6M, 6C and 6K, and a transfer means 25 are disposed in the outer periphery of the rotating drum- like image forming body, and four image exposure means 7Y, 7M, 7C and 7K are disposed inside the image forming body, and a color image constituted by superimposing the toner images of different colors formed on the image forming body by repeating charging, image exposure and development is transferred and fixed on a transfer material. The image forming body is provided with a mirror part having its leading edge in a direction of inserting it into a device main body 1 as an open end for receiving the image exposure means inside and provided with a bearing at its trailing edge in the inserting direction. The mirror part is mounted in a state where its inner peripheral surface on the open end side is supported by the device main body and a driving gear supported in the device main body is meshed with a drum gear set on the outer periphery and a shaft fixed in the device main body is fitted in the bearing of the mirror part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a cleaning device, four pairs of chargers and developing devices, and a transfer means on the outer periphery of a rotating drum-shaped image forming body, and four cleaning devices are provided inside. The present invention relates to a color image forming apparatus which is provided with an image exposing means and which transfers a color image formed by superposing toner images of different colors formed by repeating charging, image exposure and development on an image forming body to a transfer material to fix it. .

[0002]

2. Description of the Related Art The above-described color image forming apparatus can form a color image having a length equal to or longer than the circumference of the image forming body, and the image exposure of the second and subsequent colors can be hindered by the previously formed toner image. JP-A-5-307307 discloses a color image forming apparatus capable of forming a color image having a good color balance by being incident on an image forming body similarly to the first color image exposure. However, since the color image forming apparatus described in this publication adopts a structure in which the axis penetrates the image forming body and the support made of a heat conductor holding the four image exposing means therein. In addition, there is a problem that assembling the image forming body and the image exposing means and adjusting the position of the image exposing means with respect to the charging device and the developing device on the outer periphery of the image forming body are troublesome and troublesome.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is capable of forming a color image having a color balance with a length equal to or longer than the circumference of the image forming body. The image forming body and the image exposing means inside the image forming means can be easily assembled, exchanged, and maintained, and the relative position between the image forming body and the charger or the developing device can be easily adjusted. The purpose is to provide a device.

[0004]

According to the present invention, a cleaning device, a pair of four chargers and a developing device, and a transfer means are provided on the outer circumference of a rotating drum-shaped image forming body, and a cleaning means is provided inside. A color image is formed by arranging individual image exposing means, and transferring a color image formed by superposing toner images of different colors formed by repeating charging, image exposure and development on the image forming body to a transfer material to fix the color image. In the apparatus, the image forming body has a mirror portion provided with a bearing at the rear end in the insertion direction, with the front end in the insertion direction into the apparatus main body as the open end for receiving the image exposure means, and the inner peripheral surface on the open end side. Is rotatably supported by a supporting means supported by the device body, and a drive gear supported by the device body meshes with a drum gear provided on the outer circumference on the open end side, and is fixed to the device body by the bearing of the mirror section. Mounted in the main body of the device with the fitted shaft fitted The color image forming apparatus or the four image exposing means is held by a columnar support body having a shaft hole formed in at least one end face, and the other end face side of the support body is held. It is installed inside the device body by being fixed to the vertical surface of the device body, and the image forming body has a mirror part having a bearing on one end face side, and the other end face side has a drum gear on the outer circumference. As an end, the open end is inserted into the main body of the apparatus to receive the support therein, and the open end side is rotatably supported by the supporting means supported by the main body of the apparatus, and the main body of the drum gear is supported by the drum gear. The drive gear supported by the gear meshes with the bearing of the mirror portion of the image forming body, and the shaft fixed to the device body is fitted into the shaft hole of the support body so that the drive gear is mounted in the device body. In a color image forming apparatus characterized by To achieve the object by these configurations.

[0005]

That is, in the color image forming apparatus of the present invention, four image exposing means are received from the open end into the inside of the image forming body by inserting the image forming body into the main body of the apparatus with the open end side as the head. The image forming body is easily attached to the apparatus main body by fitting the shaft fixed to the apparatus main body to the bearing of the mirror portion on the side opposite to the insertion direction of the image forming body. By doing so, it is possible to easily adjust the relative positions of the charger and the developing device on the outer periphery of the image forming body and the four image exposing means inside the image forming body, and to clean the image forming body and its outer periphery. The apparatus, the four pairs of the charger and the developing device, the transfer means and the four image exposure means inside can be easily assembled, maintained and replaced.

[0006]

The present invention will be described below with reference to the illustrated examples.

FIG. 1 is a schematic sectional view showing an example of a color image forming apparatus according to the present invention, FIG. 2 is a perspective view of the image forming apparatus showing a mounting and demounting state of a cartridge of an image forming body, and FIG. FIG. 4 is a partial sectional view of the image forming apparatus in the axial direction of the image forming apparatus, showing the mounted state;
5 and 6 are partial cross-sectional views of the image forming body in the axial direction of the image forming apparatus, showing different examples of the supporting means on the open end side of the image forming body.

In the figure, reference numeral 1 is a main body of an apparatus comprising a lower frame 11 and an upper frame 12 which can be opened and rotated with respect to the lower frame 11 as shown by a two-dot chain line in FIG. 1, and 2 is a clockwise direction in FIG. It is a drum-shaped image forming body that is open at one end and rotates.

As shown in FIGS. 3 and 4, the image forming body 2 of the illustrated example has a transparent conductive layer and an organic photoconductor layer (OPC) on the outer periphery thereof.
A photosensitive cylindrical body 2a made of a transparent material such as optical glass or a transparent acrylic resin, and a mirror member 2b integrally joined to one end surface of the photosensitive cylindrical body 2a and fitted with a bearing.
And an annular gear body 2c which is integrally coupled to the other end surface side of the photosensitive cylindrical body 2a by press fitting and has a gear formed on an outer peripheral portion protruding from the outer diameter of the photosensitive cylindrical body 2a. That is, the image forming body 2 has an open end surface for accommodating the image exposing means inside the image forming body 2 on the side of the annular gear body 2c.

Reference numeral 3 denotes a cartridge frame, which is the image forming body 2.
Is inserted into the cartridge frame 3 from the open end side of the cartridge frame 3 with the side of the mirror member 2b as the head, and the shaft pin 3a standing upright from the inner surface of the mirror portion of the cartridge frame 3 is fitted to the bearing of the mirror member 2b. At the same time, the outer peripheral surface of the annular gear body 2c closer to the tip end than the gear portion is placed on the plurality of receiving rollers 3c provided on the inner flange portion of the open end of the cartridge frame 3 so that the open end side of the image forming body 2 is placed on the receiving roller 3c. By being supported by the receiving roller 3c, it is supported in the cartridge frame 3. When the cartridge frame 3 incorporates a cleaning device or a pair of four chargers and a developing device as described later, when the image forming body 2 is inserted into or removed from the cartridge frame 3, The cleaning blade and the developing device are preliminarily displaced to the retracted position so that the cleaning blade of the cleaning device and the developing roller of the developing device do not come into contact with the surface of the image forming body 2. The shaft pin 3a is fixed to the mirror portion of the cartridge 3 by the mirror portion of the cartridge frame 3 and the front plate 3b attached to the outer surface of the mirror portion, and the plurality of receiving rollers 3c are fixed to the image forming body 2. So as to be inserted into the cartridge 3 so as to contact the lower half of the image forming body 2.

As described above, when the cartridge frame 3 supporting the image forming body 2 is engaged with the guide rail 12a provided on the upper frame 12 and fed into the upper frame 12, the upper frame for the gear of the annular gear body 2c is formed. The upper frame 12 of the example of FIGS. 3 and 4 with respect to the meshing of the drive gear 12b supported by 12 and the inner peripheral surface of the annular gear body 2c.
A plurality of supporting rollers 12c directly supported by the above, or a plurality of supporting rollers 12c supported by a supporting body 8 described later connected to the upper frame 12 of the example of FIG. 5, or a supporting body 8 of the example of FIG. The supporting means such as the mounted bearing 8c is engaged, the flange step surface of the supporting means is brought into contact with the tip end surface of the annular gear body 2c, and the shaft pin 3a is attached to the outer end surface of the bearing inner race of the mirror member 2b. The contact of the end face of the large diameter portion of the root occurs, and by fixing the front plate 3b of the cartridge frame 3 to the upper frame 12 with this state, the image forming body 2 is mounted on the upper frame 12. Is done.

When the support means is engaged with the inner peripheral surface of the annular gear body 2c, the contact between the outer periphery of the tip end portion of the annular gear body 2c and the receiving roller 3c is slightly separated. When the supporting means is a plurality of supporting rollers 12c, the image forming body 2 is supported by abutting the supporting roller 12c on the outer peripheral surface of the tip end portion of the annular gear body 2c by shifting the positional phase with the receiving roller 3c. You can also Further, by the above-mentioned mounting, the image forming body 2 is grounded at the transparent conductive layer and can be rotated clockwise by the drive gear 12b in FIG. The image forming body 2 can be removed from the apparatus main body 1 by removing the screwing of the front plate 3b and pulling out the cartridge frame 3 from the upper frame 12. This cartridge may be attached and detached with the upper frame 12 being opened and rotated as shown by the chain double-dashed line in FIG. 1. Alternatively, a corona discharger that does not contact the image forming body 2 may be used as the transfer means. If desired, the upper frame 12 can be closed.

As described above, since the upper frame 12 of the image forming body 2 can be easily attached to and detached from the apparatus main body 1 and the cartridge frame 3, four sets or four of the charger and the developing device around the image forming body 2 can be attached. It is possible to easily and accurately adjust the arrangement position of the image exposure means and the like depending on the absence of the image forming body 2. The image forming body 2 has an outer diameter of 70 mm or more in order to arrange four sets of a charger and a developing device, a transfer device and a cleaning device on the outer periphery and four image exposing devices inside. It is preferable that the outer diameter is 150 mm or less in order to make the device compact.

Reference numeral 4 denotes a cleaning device for removing residual toner on the outer peripheral surface of the image forming body 2 by a scraper blade 4a which comes into contact with the outer peripheral surface before starting the rotation of the image forming body 2 and leaves the outer peripheral surface after the rotation is stopped. In order to incorporate the cleaning device 4 into the cartridge frame 3 as well, the toner accumulated at the bottom of the cleaning device 4 is sent out of the side wall by the conveying screw 4b and dropped by the drop pipe 4c to the waste toner container 40 side arranged on the lower frame 11 side. The cleaning device 4 is downsized by adopting the configuration. Cartridge frame 3
Conveyor screw 4 of cleaning device 4 incorporated in
The rotation of b is transmitted from the annular gear body 2c.

The toner dropped from the cleaning device 4 is stored in the waste toner container 40 by the conveying screw 40a of the waste toner container 40. The bottom of the waste toner container 40 is provided with a reciprocating transport plate 40b for feeding the stored toner to the inner side. When the cleaning device 4 having a large toner storage capacity is used, the waste toner container 40 and the like can be omitted, and the cleaning device 4 is not limited to one using a scraper blade or one incorporated in the cartridge frame 3.

5Y, 5M, 5C and 5K are scorotron chargers for performing corona discharge toward the outer peripheral surface of the image forming body 2, 6
Y, 6M, 6C and 6K are chargers 5Y, 5M and 5 respectively.
An electrostatic image formed on the outer peripheral surface of the image forming body 2 charged by C and 5K as described later is subjected to yellow (Y), magenta (M) by a non-contact reversal development method using a one-component or two-component developer. ), Cyan (C), and black (K) color toner images. Four sets of these chargers 5Y to 5K and developing devices 6Y to 6K are also attached to the cartridge frame 3. The drive of the developing rollers and the agitating means of the developing devices 6Y to 6K is transmitted from the annular gear body 2c through the connecting / disconnecting means such as an electromagnetic clutch, and the developing devices 6Y to 6K are miniaturized so that the respective toner supply containers are supplied. 60Y, 60M, 60
By providing C and 60K on the upper frame 12 side, similarly to the case of feeding the collected toner from the cleaning device 4 to the waste toner container 40,
Toner supply container 60Y-60K side toner delivery screw 60
The toner is supplied from the toner supply containers 60Y to 60K to the developing devices 6Y to 6K by means of a and the toner feeding screw 6a on the side of the developing devices 6Y to 6K. The electrical connection for turning on / off the connecting / disconnecting means and for connecting / disconnecting the scraper blade 4a of the cleaning device 4 is performed by mounting the cartridge or manually after mounting.

In the case where the developer stirring means of the developing devices 6Y to 6K stirs by arranging two conveying screws for feeding the developer in the axial direction in parallel in the opposite conveying direction and circulating and conveying the developer. By dropping the toner from the toner replenishing containers 60Y to 60K in the circulation path extending to the side surface of the developing device, it is possible to omit the provision of the toner feeding screw 6a on the developing device 6Y to 6K side. The developing devices 6Y to 6K may be integrally provided with a toner replenishing tank or may be directly attached to the upper frame 12 and not incorporated in the cartridge frame 3. The chargers 5Y to 5K may also be directly attached to the upper frame 12. In the image forming apparatus of the illustrated example, the cleaning device 4 and the four sets of the chargers 5Y to 5K and the developing devices 6Y to 6K are also attached to and detached from the upper frame 12 together with the image forming body 2, and therefore, the cleaning device except when attached. 4 and the toner supply containers 60Y to 60K, the drop tubes 4c and 60b, the waste toner container 40, and the developing device 6Y to
In order to prevent the toner from spilling from the drop tube 4c or 60b due to the disconnection with the receiving tube on the 6K side, at the lower end of the drop tube 4c or the like, as shown in FIGS. When the frame 3 is inserted into the mounting position of the image forming body 2 or the like, it is pushed by the cam 11a provided on the lower frame 11 or the receiving pipe on the side of the developing devices 6Y to 6K to open the drop pipe 4C against the spring bias. When the cartridge frame 3 is pulled out from the upper frame 12, the slide caps 4d and 60c which are spring-biased are provided so as to move to positions where the drop tube 4c and the like are closed by spring bias.
The cam 11a releases the push of the slide cap 4d to close the drop tube 4c even when the upper frame 12 is opened and rotated with respect to the lower frame 11 for removing the jammed transfer material, and the toner is removed. Prevent spillage.

7Y, 7M, 7C and 7K are FL and E in which light emitting elements are arranged in an array arranged in the axial direction of the image forming body 2.
LISA, PLZT, LCS in which L, PL, LEDs, or line light sources and elements having a shutter function are arranged as an example.
And a selfoc lens as a unity-magnification image forming element, which is an image exposure unit, and is fixed at each position allocated to the support 8.
Each fixed position can be easily adjusted. Then, the image exposure units 7Y to 7K are sequentially input with Y, M, C, and K image signals read by an image reading apparatus separate from the image forming apparatus of the illustrated example from the memory, so that the charger 5 is obtained.
Image exposure of a dot configuration is incident on the inner peripheral surface of the image forming body 2 charged by Y, 5M, 5C and 5K to form an electrostatic image on the image forming body 2.

In the example of FIGS. 3 and 4, the image exposure means 7Y
The columnar support 8 to which ~ 7K is attached has a front end side central hole 8a into which the shaft pin 3a fixed to the mirror portion of the cartridge frame 3 is fitted on the front end face which enters the image forming body 2 as described above. ,
A rear end side center hole 8b into which the center pin 12d planted in the upper frame 12 fits is formed on the opposite surface, and the rear end side center hole 8b is formed.
While b is engaged with the center pin 12d planted in the upper frame 12, it is fixed to the upper frame 12 by a tightening screw. Needless to say, it is preferable to engage not only the center pin 12d but also the positioning pin during this fixing.

After fixing the support 8, the cartridge frame 3 is engaged with the guide rail 12a provided on the upper frame 12 and fed into the upper frame 12 as described above, and the front plate 3b is attached to the upper frame 12. The support 8 is inserted into the image forming body 2, the shaft pin 3a is fitted into the distal end side center hole 8a of the support 8, and the image forming body 2 is mounted so that the center is exactly aligned with the support 8. Charging devices 5Y to 5K, developing devices 6Y to 6K, and image exposure means 7Y to
The relative position of 7K is set accurately. Reference numeral 71 denotes a lead wire for driving each of the image exposure units 7Y to 7K, and 81
Reference numerals 82 and 82 are a heater and a heat pipe described later.

Reference numeral 20 is a paper feed cassette for the transfer material, 21 is a friction feed roller, 22 is a pinching and conveying roller, 23 is a manual feed guide, 24 is a timing roller, and 25 is a transfer material that charges the transfer material in a polarity opposite to that of the toner. A transfer device, 26 is a separator for removing charge from the transfer material on which the toner image is transferred and separating it from the image forming body 27.
Is a conveyor with suction means for adsorbing and transporting the separated transfer material, 28 is a fixing device for fixing the toner image to the transfer material by a heating roller, and the fixing device 28 and the members on the lower frame 11 side are the lower frame 11 It is installed in.

Further, the transfer device 25, the separator 26 and the conveyor 27
In the state where the upper frame 12 is opened and rotated as shown by a chain double-dashed line, the upper frame 12 should be rotated integrally as shown by a chain double-dashed line around the drive roller shaft on the fixing device 28 side of the conveyor 27. As a result, the waste toner container 40 can be taken out of the machine for discarding the accumulated toner.

The color image forming process is performed by the above apparatus as follows.

The image information of the original document read by the image reading device by the image pickup device or the image information edited by the computer is temporarily stored in the memory as an image signal for each color of Y, M, C and K. Next, when image recording is started, the image forming body 2 rotates clockwise in FIG. 1, and the cleaning device 4 cleans the outer peripheral surface of the image forming body 2. The charger 5Y discharges the outer peripheral surface thereof to uniformly charge the image forming body 2. Image exposing means 7 is provided on the inner peripheral surface of the charged image forming body 2.
Based on the Y image signal input from the memory, Y is image-exposed to form an electrostatic image of Y on the image forming body 2. The electrostatic image is developed by the developing device 6Y to form a Y toner image on the outer peripheral surface of the image forming body 2.

Next, the charger 5M discharges the outer peripheral surface of the image forming body 2 on which the Y toner image is formed to uniformly charge the Y toner image forming surface of the image forming body 2, and the charged image forming body 2 is charged. Similarly, the image exposing means 7M makes an image exposure based on the image signal of M incident on the inner peripheral surface of the image forming means to form an electrostatic image of M on the image forming body 2, and the electrostatic image is developed by the developing device 6M. A two-color image is formed on the outer peripheral surface of the image forming body 2 by superposition of the M toner image and the previously formed Y toner image.

Next, similarly, the charger 5C and the image exposing means 7 are similarly provided.
A C toner image is formed by C and the developing device 6C,
Further, the charger 5K, the image exposure means 7K, and the developing device 6K.
Thus, the K toner images are sequentially superposed and formed, and a color image of four colors is formed on the outer peripheral surface of the image forming body 2 within one rotation.

In this color image forming step, each image exposing means 7Y to 7K for forming an electrostatic image on the image forming body 2 is formed.
Image exposure is performed on the inner peripheral surface of the image forming body 2 on which a toner image is not formed, so that the first to last electrostatic images are formed in substantially the same manner without being affected by the toner image. To easily form a color image having excellent color balance, and image exposure means 7Y to 7K by image exposure.
Further, in order to prevent the temperature of the image forming body 2 and the like from becoming too high and shortening their life, or the temperature of the image exposing means 7Y to 7K being too low, the supporting ability is reduced. A material having good thermal conductivity is used for the body 8 and a heater 81 and a heat pipe 82 are embedded in the body 8. When the temperature is low, the heater 81 heats it, and when the temperature becomes high, the heat pipe 82 cools it, and the color balance. In order to form a superior color image, it is special to apply a developing bias to the developing sleeve 61 from a bias power source (not shown) to the developing sleeve 61 during non-contact reversal development by each developing device 6Y to 6K. This is the same as in the color image forming apparatus of Kaihei 5-307307.

As described above, the color image formed on the outer peripheral surface of the image forming body 2 is guided from the lower paper feed cassette 20 through the friction feed roller 21 and the pinching / conveying roller 22 or by manual guide.
The transfer device 25 transfers the transfer paper from the 23 side to the transfer paper sent by the timing roller 24 via the pinching and conveying roller 22. Then, the transfer paper on which the color image is transferred is separated by a separator.
It is separated from the image forming body 2 by 26, is conveyed by the conveyor 27, and the color image is fixed by the fixing device 28 and then discharged outside the apparatus. On the other hand, the outer peripheral surface of the image forming body 2 from which the transfer paper is separated is cleaned of the residual toner by the cleaning device 4 and is provided for the next color image forming step.

[0029]

According to the color image forming apparatus of the present invention, four image exposing means are received from the open end into the inside of the image forming body by inserting the image forming body into the main body of the apparatus with the open end side as the leading end. , The image forming body is easily attached to the apparatus main body by fitting the shaft fixed to the apparatus main body to the bearing of the mirror portion on the side opposite to the insertion direction of the image forming body. By doing so, it is possible to easily adjust the relative positions of the charger and the developing device on the outer periphery of the image forming body and the four image exposing means inside the image forming body, and the cleaning device for the image forming body and its outer periphery. Assembling and maintenance of four pairs of charger and developing device, transfer means and four image exposure means inside
Exchange or the like can be easily performed.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of a color image forming apparatus of the present invention.

FIG. 2 is a perspective view of the image forming apparatus showing a mounting and demounting state of a cartridge for an image forming body.

FIG. 3 is a partial sectional view of the image forming apparatus in the axial direction of the image forming apparatus, showing a mounted state of the cartridge for the image forming body.

FIG. 4 is a partial cross-sectional view of the image forming apparatus in the axial direction of the image forming apparatus, showing how the image forming apparatus cartridge is attached and detached.

FIG. 5 is a partial cross-sectional view of the image forming apparatus in the axial direction of the image forming apparatus, showing a different example of the supporting means on the open end side of the image forming body.

FIG. 6 is a partial cross-sectional view of the image forming body in the axial direction of the image forming apparatus, showing a different example of the supporting means on the open end side of the image forming body.

[Explanation of symbols]

 1 Device Main Body 2 Image Forming Body 3 Cartridge Frame 4 Cleaning Device 5Y, 5M, 5C, 5K Charger 6Y, 6M, 6C, 6K Developing Device 7Y, 7M, 7C, 7K Image Exposure Means 8 Support 20 Paper Feed Cassette 21 Friction Sending roller 22 Clamping conveying roller 23 Manual feed guide 24 Timing roller 25 Transfer device 26 Separator 27 Conveyor 28 Fixing device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03G 15/08 506 A 21/10 21/16 G03G 21/00 354

Claims (7)

[Claims] 1. A cleaning device, a pair of four chargers and a developing device, and a transfer means are provided on the outer periphery of a rotating drum-shaped image forming body, and four image exposing means are provided inside. do it,
In a color image forming apparatus for transferring and fixing a color image formed by superposing different color toner images formed by repeating charging, image exposure and development on the image forming body, the image forming body is fixed to the main body of the apparatus. Has a mirror portion having a bearing at the rear end in the insertion direction, with the front end in the insertion direction as the open end for receiving the image exposure means, and the inner peripheral surface on the open end side is rotated by the support means supported by the apparatus main body. The main body of the apparatus is movably supported, and the drive gear supported by the main body of the apparatus meshes with the drum gear provided on the outer periphery of the open end side, and the shaft fixed to the main body of the apparatus is fitted to the bearing of the mirror portion. A color image forming apparatus which is mounted inside. 2. A cleaning device, four pairs of chargers and developing devices, and transfer means are provided on the outer periphery of a rotating drum-shaped image forming body, and four image exposing means are provided inside. do it,
In a color image forming apparatus for transferring and fixing a color image formed by superimposing toner images of different colors formed on an image forming body by repeating charging, image exposure and development, four image exposing means are provided. It is installed in the apparatus main body by being held by a columnar support body having a shaft hole formed in at least one end surface, and the other end surface side of the support body being fixed to the vertical surface of the apparatus main body, thereby forming an image. The body has a mirror portion provided with a bearing on one end face side, and the other end face side is an open end having a drum gear on the outer periphery, and the open end is inserted into the main body of the apparatus and the support body is inserted inside. And a drive gear supported rotatably by the support means having an open end side supported by the apparatus main body and supported by the apparatus main body on the drum gear, and a bearing of the mirror portion of the image forming body. And in the shaft hole of the support By axis is fitted to be fixed to Okimoto body, the color image forming apparatus characterized by being mounted in the apparatus main body. 3. The positioning of the image forming body in the inserting direction is
Abutment of the end face of the large-diameter portion of the root of the shaft fixed to the apparatus body to the bearing end face of the mirror portion and abutment of the flange step surface of the supporting means to the open end face of the image former. The color image forming apparatus according to claim 1, wherein the color image forming apparatus comprises: 4. An outer peripheral or inner peripheral supported by the supporting means on the open end side of the image forming body and a drum gear on the outer peripheral side are formed on an annular member press-fitted into the open end of the image forming body. The color image forming apparatus according to any one of claims 1 to 3. 5. The image forming body is incorporated into a cartridge frame and inserted into the apparatus body, and the shaft is attached to a front plate of the cartridge frame and fixed to the apparatus body by fixing the front plate to the apparatus body. Claims 1 to 4
The color image forming apparatus according to claim 1. 6. The supporting means for rotatably supporting the open end side of the image forming body comprises a plurality of supporting rollers.
The color image forming apparatus according to claim 5. 7. A bearing fitted to the support body, wherein the support means for rotatably supporting the open end side of the image forming body supports the four image exposing means and is fixed to the apparatus main body. The color image forming apparatus according to any one of claims 2 to 5, further comprising: