JP3376539B2 - Color image forming equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic apparatus for forming a color image on the outer peripheral surface of a rotating drum-shaped image forming body by repeating charging, image exposure and development to superpose a plurality of toner images. System color image forming apparatus.

[0002]

2. Description of the Related Art As an apparatus for forming a multicolor image, a toner image of each color is superposed on the image forming body by sequentially repeating image exposure and development of an image corresponding to each color during one rotation of the image forming body. A color image forming apparatus that forms a combined color image is known. In the image forming apparatus, a plurality of charging means, image exposing means and developing means must be arranged on the outer periphery of the image forming body, and a transfer material carrying area for transferring a color image and a cleaning means must be provided. However, there is a drawback in that a large diameter image forming body having a long peripheral surface length is required, the size is increased, and the balance is deteriorated.

As an apparatus for solving the above-mentioned drawbacks, the base body of the image forming body is made transparent, a plurality of image exposing means are housed inside the image forming body, and image exposure is performed from the inside of the image forming body. A device has been proposed. In such an apparatus, in order to form a clear color image, the positional accuracy of the relationship between the rotating image forming body and the plurality of fixed image exposing means is required to be stably and accurately maintained, and the image forming is performed. It is required that the body and the developer layer conveying rollers of the plurality of developing devices maintain a predetermined gap and smoothly rotate at a predetermined speed. It is also required that the image forming body and its drive system can be easily brought into and out of contact with each other so that maintenance such as replacement of the small diameter image forming body can be easily performed. However, the conventional color image forming apparatus in which the image exposing means is housed inside the image forming body has not sufficiently satisfied those requirements.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to sufficiently satisfy the requirements of the color image forming apparatus described above, and the positional accuracy of the relationship between the image forming body and the plurality of image exposing means is stable. A color image forming apparatus in which an image exposing unit is housed inside an image forming body capable of easily forming a color image which is kept accurately and can be easily formed and in which maintenance such as replacement of the image forming body can be easily performed. in the former and a plurality of developing devices of the developer layer transport rollers to provide a color image forming apparatus for performing smooth rotation in each stable position with a predetermined gap and the positional relationship with the first object, a further Assembly, disassembly of the drive system of the image forming body and the developer layer conveying roller of the developing device,
A second object is to provide a color image forming apparatus that can be easily maintained.

[0005]

According to the present invention, a color image formed by superposing a plurality of toner images is formed on the outer peripheral surface by repeating charging, image exposure and development on the peripheral surface of a rotating drum image forming body. in the color image forming apparatus, one end portion to the image forming member is the optical system support which is fixed to the side plate of the housing to the apparatus body therein a plurality of image exposure means disposed in the optical system support having a drum gear It is installed in the main body of the apparatus by being engaged with the body so that it can rotate relative to the body, and
A plurality of developing devices are arranged with the developer layer transport roller close to each other.
And a rotation transmission gear that rotates the image forming body.
A row and a motor for rotating the developer layer conveying roller
The rolling transmission gear train is supported by the side plate, and the front
Drive gear meshing with the drum gear and development of the developing device
The drive gear that meshes with the agent layer transfer roller gear is a helical gear.
The axial component of the driving force of those drive gears to the same direction.
The configuration to be image forming body and positional stability utilized to characterized Rukoto of the developing device, the relationship positional accuracy of the image forming body and a plurality of image exposure means stably and accurately kept free from color shift color image Can be easily formed, and maintenance such as replacement of the image forming body can be easily performed .
Maintain a predetermined gap and positional relationship with the developer layer transport roller of
Each of the above-mentioned first parts performs smooth rotation at stable positions .
Achieve the purpose of.

[0006]

[0007]

[0008]

[0009]

[0010] Claim 1 arrangement of claim 2 in the, is supported by the side plate as a rotation transmission system and it is an integrated unit for the developer layer transport rollers rotation transmission system and the developing device for the image forming body By the addition of the constitution characterized by the above, the second object that the assembly, disassembly and maintenance of the drive system of the image forming body and the developer layer conveying roller of the developing device can be easily achieved is achieved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the accompanying drawings.

First, the structure of a color image forming apparatus according to the present invention will be described with reference to FIGS.

Reference numeral 10 in the drawing denotes a drum-shaped image forming body, which is formed by coating a transparent conductive layer and an organic photoconductor layer (OPC) on the outer periphery of a cylindrical substrate made of a transparent member such as optical glass or transparent acrylic resin. The end ring 10 in which the bearings are fitted to the inner circumferences of the inner diameters of both ends of the photoconductor drum.
A and an end gear ring 10B of a drum gear member having a drum gear 10G on the outer circumference are integrally fitted. In the illustrated example, the end gear ring 10B has the external gear drum gear 10G, but it is of course possible to have the internal gear drum gear 10G.

11Y to 11K are chargers using a scorotron corona discharger, and 12Y to 12K are image forming members 1.
The image exposing means is composed of LEDs arranged in parallel with the axis direction of 0 and a SELFOC lens under the trade name as an image forming element. To the image exposure units 12Y to 12K, separate color image signals such as separated colors read by an image reading device are sequentially taken out from the memory and input as electric signals.

Image forming body 10 and image exposing means 12Y to 12K
Are integrated in the unit 3. Regarding this, the unit shaft 31 and a pair of front and rear brackets 32 and 33 fixed to the unit shaft 31 constitute the optical system support 30,
The image forming body 10 includes an end ring 10A at both ends and an end gear ring 1
The bearings fitted to OB are fitted to the outer diameters of the brackets 32 and 33, respectively, so that the bearings are rotatably connected to the optical system support 30. Before that, the image exposure means 12Y to 12K
Are adjusted to have the outer diameters of the brackets 32 and 33 of the optical system support 30 by adjusting both ends of the image formation body 10 through the attaching members 34 so that the distance between the image forming body 10 and the inner surface of the photoconductor drum has a predetermined positional relationship. Adhesively fixed. As a result, the relative positions of the image exposing means 12Y to 12K with respect to the image forming body 10 can be set with high accuracy, so that the image exposing means 12Y to 12K.
Thus, it is possible to easily align the positions of the electrostatic latent images formed on the image forming bodies 10 accurately, and it is possible to easily form a color image having no color shift.

The unit shaft 31 is used to hold the image forming body 10 held.
And a bracket 3 provided with image exposure means 12Y to 12K
2, 33 are located between both side plate portions of a U-shaped bracket 35 composed of both side plate portions and connecting beam portions, and are rotatably mounted on both side plate portions so that both ends project from the both side plate portions. It
A phase pin 36 is planted at the end of the unit shaft 31 protruding to the outside of one of the side plates, and a front nut 38 is attached to the end of the other side plate to protrude to the outside by a tip nut 37.
Is tightened and fixed. This constitutes the unit 3.

Regarding the wiring for the image exposing means 12Y to 12K, the electric wiring connected from each of the image exposing means 12Y to 12K through the connector is the lightening hole of the bracket 32 of the optical system support 30 and the image forming body 10. Of the end ring 10A from the center hole of the image forming body 10 to the outside of the front plate 38 through the notch 35A of the side plate of the U-shaped bracket 35, and is connected to the wiring for signals and power by a connector. Is provided. By thus providing a large number of wirings from the front side in the attaching / detaching direction of the image forming body, it is possible to prevent the electric wirings on the rear side rear plate 70 side from becoming complicated, and to prevent the developing device 13 from developing.
Y to 13K and the drive system of the image forming body 10 can be easily arranged. Also, when the image forming body 10 is attached and detached, since the power is supplied from the front side in the attaching and detaching direction, the connection and the detachment can be reliably and easily performed, or the image forming body 10 can be attached and detached while being connected.

The front plate 38 is provided with insertion ports 38A for the chargers 11Y to 11K. U-shaped bracket 35
Is a bottom surface against which the connecting beam portion is placed on the floor surface when the unit 3 is placed on the floor surface.
It is also used as a stand that does not allow Y-12K to contact the floor.

In the unit 3, with the phase pin 36 side of the unit shaft 31 as the head, the connecting beam portion of the U-shaped bracket 35 is inserted through the insertion hole 70A provided in the front side plate 70 of the apparatus main body to the front and rear side plates 70 of the apparatus main body. Guide support rail 71 provided between
And is fed into the apparatus main body to mesh the drum gear 10G of the image forming body 10 with the drive gear 62,
Bearing seat 7 in which the phase pin 36 is provided on the rear plate 70 of the apparatus main body
2 is engaged with the positioning taper groove formed in FIG.
Fixed to. As a result, the image forming body 10 and the image exposing means 12Y to 12K are installed in the main body of the apparatus at accurate positions and phases.

In the example of FIG. 3, in order to fix the front plate 38 to the front plate 70 of the apparatus main body, the reference pins P2 of the front plate 70 are engaged with the plurality of reference holes H1 provided in the front plate 38. Since the front plate 38 is positioned by using the unit shaft 31 and the tip nut 37 when the front plate 38 is first fixed to the front plate 70 of the apparatus body, the front plate 38 is tightened so as not to rotate. Fix the reference hole H1
And the reference pin P2 are engaged with each other.

Each of the chargers 11Y to 11K is inserted into the main body of the apparatus through the insertion opening 38A of the front plate 38 attached to the front plate 70, with the power receiving terminal side at the head, and the guide support rail 73 provided between the front and rear side plates 70 is inserted. According to the guide, the power receiving terminal is the rear side plate 70
After being fed so as to be connected to the power supply terminal provided on the image forming body 10, the push lid 39 is screwed to the insertion opening 38A so that the image forming body 10 is operably installed at a predetermined distance. Therefore, in order to remove the unit 3 from the main body of the apparatus, the chargers 11Y to 11K are first taken out from the insertion opening 38A, and then the front plate 38 is removed from the front side plate 70 and pulled out. In addition, prior to the removal of the unit 3, a developing device 13Y to be described later with respect to the peripheral surface of the image forming body 10 will be described.
Needless to say, it is necessary to release the pressure contact action of 13K, the intermediate transfer belt 14 and the cleaning blade of the cleaning device 100 by a conventionally known means or the like, and retreat for about 1 mm or more.

13Y to 13K are yellow (Y), magenta (M), cyan (C) and black (K), respectively.
Is a developing device for accommodating the developer using the toner, and is fed from the side of the front side plate 70 into the main body of the apparatus until it is stopped by the locking guide 75 according to the guide support rail 74 provided between the front and rear side plates 70, Next, in the example shown in FIG. 2, the engagement / separation action shaft 42 that engages with the eccentric groove cam 41 supported on the lower surface side of the guide support rail 74 is rotated by rotating the eccentric groove cam 41 with the contact / separation operation handle 40. Direction, and by pushing the developing devices 13Y to 13K by the springs provided on the shafts so that the rotatable spacer rollers on both sides of the developing sleeves 130 come into pressure contact with the image forming body 10, they are moved into the apparatus main body. Is installed. As a result, the reduction gears 53 to 56 described later mesh with the sleeve gears 133 to 136 integrated with the developing sleeve 130. Reverse the above operation to the developing device 13
The pressure contact of Y to 13K with respect to the image forming body 10 can be released, and the image forming body 10 can be taken out from the apparatus main body.

The developing devices 13Y to 13K installed are shown in FIG.
As shown in, the vertical line X passing through the center of rotation of the image forming body 10
The developing sleeve 130, which is a developer-conveying roller, occupies positions that are substantially symmetrical to the left and right of X and that are separated above and below a horizontal line YY that passes through the center of rotation, and rotates in the same surface movement direction as the image forming body 10 while maintaining a predetermined gap. Each of the chargers 11Y to 11
The electrostatic latent image formed on the image forming body 10 by the charging by K and the image exposure by the image exposing means 12Y to 12K causes a developer layer carried by the developing sleeve 130 by applying a developing bias voltage to the developing sleeve 130. Reverse development is performed on the toner image under non-contact conditions.

Next, an image forming process of the above-mentioned color image forming apparatus will be described.

Image information obtained by reading an original image by an image pickup device or an image information edited by a computer by an image reading device separate from the present device is temporarily stored in a memory as Y, M, C and K color-specific image signals. Stored and stored.

When the image recording is started, the photosensitive member drive motor is started and the drive gear 62 is rotated to rotate the image forming body 10 as described above. At the same time, the charging action of the charger 11Y is started to uniformly apply a potential to the peripheral wall of the image forming body 10. The image exposing means 12Y is provided on the inner surface of the peripheral wall to which the electric potential is applied.
Is incident on the image exposure modulated by the image signal of the first color, for example, Y from the above-mentioned memory, and Y of the original image is projected on the surface of the peripheral wall.
An electrostatic latent image corresponding to the component image is formed. The electrostatic latent image is reversely developed by the developing device 13Y under the condition that the developer layer on the developing sleeve 130 is not in contact, and a Y toner image is formed on the surface of the image forming body 10.

Next, the image forming body 10 is uniformly given a potential to the surface of the peripheral wall holding the Y toner image by the charging device 11M, and the inner surface of the peripheral wall to which the potential has been applied is provided with the image exposing means 12M. Image exposure based on image signals of two colors, for example, M is made incident. As a result, the electrostatic latent image formed on the peripheral wall surface is developed into an M toner image by non-contact reversal development by the developing device 13M, so that the Y toner image and the M toner image are superimposed on the surface of the image forming body 10. A two-color image is formed.

Similarly, the peripheral wall of the image forming body 10 which holds the two-color image is subjected to the charging action by the charger 11C, the image exposing means 12C and the developing device 13C, the image exposure incidence and the development to form a C toner image on the surface. By doing so, a three-color image is formed by superimposing the three toner images of Y, M, and C. Further, if necessary, the peripheral wall of the image forming body 10 which further holds a three-color image is similarly subjected to the charging action by the charger 11K, the image exposing means 12K and the developing device 13K, the image exposure incident and the development, and K toner on the surface. By forming an image, Y, M, C,
A four-color image is formed by superposing K four-toner images. That is, a three-color or four-color image is formed on the peripheral surface of the image forming body 10 within one rotation.

As described above, in the color image forming apparatus of the present invention, the image exposing means 12Y to 12K make image exposure of the first color from the inside of the image forming body 10 through the transparent substrate to the organic photosensitive layer. Not only that, the image exposures corresponding to the second, third, and fourth colors are also incident without being affected by the toner image previously formed, and an electrostatic latent image that gives a similar clear toner image is obtained. Form. The temperature rise of the image forming body 10 is prevented and the temperature is stabilized by the operation of the image exposing means 12Y to 12K, for example, a material having a good thermal conductivity is used for the optical system support 30, and when the temperature is high, it is externalized by a heat pipe. It can be achieved by radiating heat to the substrate to cool it, and when the temperature is low, heating it with a heater. Further, at the time of development by the developing devices 13Y to 13K, a developing bias in which direct current or further alternating current is applied is applied to the developing sleeve 130, respectively. As a result, non-contact reversal development is performed in which toner flies from the one-component or two-component developer layer on the developing sleeve 130 to the transparent conductive layer and is attached to the grounded image forming body 10.

The three-color or four-color image thus formed on the peripheral surface of the image forming body 10 is transferred onto the peripheral surface of the intermediate transfer body 14 used for reducing the diameter of the image forming body 10. The intermediate transfer member 14 has an electric resistance of 10 ⁸ to 10 ¹¹ Ω · c.
The rollers 14A, 14B, 14C and 1 are composed of a urethane rubber layer having a thickness of 100 to 500 μm and a Teflon layer having a similar resistance value provided as a separating surface layer.
The roller 14A and the roller 14B are stretched by 4D.
Between the roller 14C and the transfer roller 15 facing the roller 14C as a transfer area for transferring the color image to a transfer material such as transfer paper. The power transmitted to the roller 14D rotates counterclockwise in FIG. 1 in synchronization with the peripheral speed of the image forming body 10.

The color image adhered to the outer peripheral surface of the image forming body 10 is guided by the grounded roller 14A so as to come into contact with the outer peripheral surface of the image forming body 10, and a bias of 1 to 2 kV having a polarity opposite to that of the toner charging. Roller 14 to which voltage is applied
The toner is efficiently transferred to the intermediate transfer body 14 in the transferred area guided by B to move away from the outer peripheral surface of the image forming body 10, and is carried to the transfer area by the intermediate transfer body 14.

On the other hand, the uppermost transfer paper P of the paper feed cassette 16 is carried out by the paper feed roller 17 and fed to the timing roller 18, and the transfer roller 15 is synchronized with the conveyance of the color image on the intermediate transfer body 14. It is fed to the transfer area.

The transfer roller 15 rotates clockwise in synchronism with the peripheral speed of the intermediate transfer member 14, and presses the fed transfer paper P against the intermediate transfer member 14 between the roller 14C and the grounded roller 14C. 1 to 2k of the opposite polarity to the charging of the toner
When a bias voltage of V is applied, the color image on the intermediate transfer body 14 is transferred onto the transfer paper P.

The transfer sheet P on which the color image has been transferred is destaticized by the destaticizing needle 19A, is conveyed to the fixing device 21 via the conveying belt 19, and is heated by the heat roller 21A and the pressure roller 21B.
After being heated and compressed to fix the toner, the toner is ejected to the outside of the apparatus through the paper ejection roller 22.

The image forming body 10 after the color image transfer,
The cleaning device 100 and the cleaning device 140 are provided on the surfaces of the intermediate transfer body 14 and the transfer roller 15, respectively.
In addition, since the cleaning blade of the cleaning device 150 constantly presses and removes the adhered dirt such as residual toner, all the surfaces are always kept clean. The toner collected by the cleaning device 100 and the cleaning device 140 is stored in a waste toner storage container by a toner carrying pipe with a built-in carrying screw (not shown).

The drive mechanism for the image forming body and the developer layer conveying roller of the developing device in the embodiment of the present invention will be described below with reference to FIGS. 4 to 7.

In the color image forming apparatus shown in FIGS. 4 and 5, the developing sleeve 130 of each of the developing devices 13Y to 13K engages with the motor gear 50 of the motor 5 occupying a position relative to the substantially central portion of the image forming body 10. Reduction drive gears 5 engaging with two sets of branch reduction gears 51 and two branch reduction gears 52, respectively.
3, 54 and deceleration drive gears 55 and 56 are sleeve gears 133 and 134, which are integrated with the developing sleeve 130, respectively.
By engaging 135, 136, the imaging member 10
Is rotated by receiving the force pushed to the outer peripheral surface side. This allows each developing sleeve 130 to maintain an accurate gap without rattling with respect to the image forming body 10, and four sets of relatively short same gear trains can transmit the same smooth rotation from the motor gears. A well-balanced color image can be easily formed, and the apparatus can be made compact and inexpensive.

The sleeve gears 133 to 136 and the reduction drive gears 53 to 56 meshing with the sleeve gears 133 to 136 are arranged on the side of the locking guide 75 shown in FIG. A helical gear that produces an axial component force in the pushing direction is preferable because the positions of the developing devices 13Y to 13K are stable.

The above-mentioned drive gear 62 for rotating the image forming body 10 is from the motor gear 60 of the motor 6 occupying a position outside the position with respect to the peripheral portion of the image forming body 10, that is, the position with respect to the central portion, to the reduction carrier gear. 61 is a reduction drive gear driven by 61. That is, since the image forming body 10 can also transmit the smooth rotation from the motor gear by the short gear train, the image forming body 10 can receive the optical system support 30 as described above.
This makes it possible to easily form a clear color image without color shift in combination with the fact that it is relatively rotatably engaged with the device, and to make the device compact and inexpensive.

The drum gear 10G and the driving gear 62 meshing with the drum gear 10G prevent the end gear ring 10B having the drum gear 10G and the bearing from coming off when the image forming body 10 is rotated clockwise in FIGS. It is a helical gear that acts on the axial component force in the slip-out prevention direction. As a result, the rotational position of the image forming body 10 is stabilized, and the occurrence of color misregistration can be prevented. The direction of the above-mentioned axial component force of the drive gear 62 that rotates the image forming body 10 and the direction of the above-mentioned axial component force of the reduction drive gears 53 to 56 that rotate each developing sleeve 130 are the bearing and the end gear. If the ring 10B and the bracket 33 of the optical system support 30 are selected in the same direction for the engagement structure, the relative positions of the image forming body 10 and the developing devices 13Y to 13K can be further stabilized, and thus more stable. A clear color image can be formed.

Further, since the drive gear 62 is rotatably fitted to the shaft of the reduction carrier gear 61 and is supported by the swing bracket 63 whose rotation range is restricted, the motor 6 is driven in the opposite direction as shown in FIG. Rotate clockwise to swing bracket 6
3 is rotated clockwise until the drum gear 1 is rotated.
When the image forming body 10 is rotated clockwise by meshing with 0G and the motor 6 is rotated in the reverse direction, the swing bracket 63 is rotated counterclockwise until it is disengaged from the drum gear 10G. In the detached state, the front plate 38 as described above.
The unit 3 can be taken out of the main body of the apparatus by disconnecting the unit from the front plate 70. Swing bracket 63 in the illustrated example
Is a unit frame 80 of the drive mechanism unit 8 in which the shaft of the drive gear 62 holds the motor 6, the shaft of the reduction carrier gear, and the like.
The rotation range is regulated by engaging with the regulation groove 80A provided in the.

Further, the image forming body 10 and the developing device 13Y described above are used.
By assembling the driving means for the developing sleeve 130 of up to 13K into the drive mechanism unit 8 integrally and attaching the drive mechanism unit 8 to the outer surface side of the rear side plate 70 of the apparatus main body, the assembly and disassembly maintenance of the apparatus can be performed. It can be done easily.

In the example of FIGS. 6 and 7, the same two motors 5A and 5B are provided on the left and right of the position with respect to the rotation center of the image forming body 10, and the motor 5A and the motor 5B rotate the image forming body 10 respectively. Developing device 1 on the left side of the vertical line XX passing through the center
3Y, 13M developing sleeve 130 and right developing device 13
The only difference from the examples of FIGS. 4 and 5 is that the C and 13K developing sleeves 130 are rotated. That is, also in the example of FIGS. 6 and 7, the same effect as in the examples of FIGS. 4 and 5 can be obtained.

The color image forming apparatus of the present invention is not limited to the above-mentioned examples, but may be one in which a color image is directly transferred from an image forming body to a transfer material without using an intermediate transfer body. Even if the roller drive mechanism is not integrated with the unit, even if the drive gear of the developer layer transport roller does not give the force to push the developer layer transport roller toward the image forming body, the drive gear of the image forming body is flat. Gears may be used, and the effects of the present invention can be appropriately obtained with those gears.

Further, as mentioned above, it is needless to say that the drum gear 10G of the image forming body 10 can easily be an internal gear, and the same effect can be obtained.

[0046]

In the color image forming apparatus of the present invention, the positional accuracy of the relationship between the image forming body and the plurality of image exposing means is stably and accurately maintained, and the image forming body and the developer layer of the plurality of developing devices are conveyed. The roller keeps a predetermined gap and rotates smoothly at a predetermined speed. Therefore, a clear color image without color misregistration can be easily formed, and maintenance such as replacement of the image forming body is facilitated. Therefore, the image forming body and its drive system can be easily brought into and out of contact with each other for that reason, and the effect that the assembling, disassembling and maintenance are easy and the structure is compact can be obtained.

[Brief description of drawings]

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

FIG. 2 is an axial partial cross-sectional view showing an example of a mounting structure for an image forming body or the like.

FIG. 3 is a partial front view of a unit attached state in which an image forming body and the like are incorporated.

FIG. 4 is a partial view showing an example of a drive mechanism for an image forming body and a developer layer conveying roller.

FIG. 5 is a side view of a drive mechanism unit for an image forming body and a developer layer transport roller.

FIG. 6 is a partial view showing another example of the drive mechanism for the image forming body and the developer layer transport roller.

FIG. 7 is a side view of a drive mechanism unit for an image forming body and a developer layer transport roller.

[Explanation of symbols]

3 units 30 Optical system support 31 unit axis 32, 33 bracket 34 Attached member 35 U-shaped bracket 36 Phase Pin 37 Tip nut 38 Front plate 39 Push lid 5, 5A, 5B, 6 motor 50, 50A, 50B, 60 Motor gear 51, 52 Branch reduction gear 53-56 Reduction drive gear 61 reduction carrier gear 62 drive gear 63 swing bracket 8 Drive mechanism unit 80 unit frame 10 Image forming body 10A end ring 10B end gear ring 10G drum gear 11Y-11K charger 12Y-12K image exposure means 13Y-13K developing device 130 developing sleeve 133-136 sleeve gears 14 Intermediate transfer body 70 front and rear side plate 71, 73, 74 Guide support rail 72 Bearing seat 75 Locking guide 40 Handle / separate operation handle 41 Eccentric groove cam 42 Contact and separation action axis P transfer paper

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Hama ▼ Shota Ta, 2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica Co., Ltd. (72) Inventor Toshihide Miura 5-14-14 Midori-cho, Koganei-shi, Tokyo ( 56) References JP-A-7-306579 (JP, A) JP-A-5-265262 (JP, A) JP-A-6-314001 (JP, A) JP-A-8-76545 (JP, A) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) G03G 15/00 550 G03G 21/16-21/18 G03G 15/08-15/08 507 G03G 15/01-15/01 117 G03G 21/00 350 -352

Claims (2)

(57) [Claims] 1. A color image forming apparatus for forming a color image on the outer peripheral surface of a rotating drum-shaped image forming body by repeating charging, image exposure and development to form a plurality of toner images on the outer peripheral surface. The image forming body having a drum gear accommodates therein a plurality of image exposing means disposed on the optical system support and engages with the optical system support fixed to the side plate of the apparatus main body so as to be relatively rotatable. This is installed in the main body of the apparatus, and a plurality of developing devices are installed on the outer peripheral surface of the image forming body to convey the developer layer.
And a rotation transmission gear train , which are arranged close to each other and rotate the image forming body.
Motor and rotation transmission for rotating the developer layer conveying roller
The gear train is supported by the side plate, and
Drive gear meshing with the gear and the developer layer carrying of the developing device
The drive gear that meshes with the feed roller gear is a bevel gear,
The axial component of the driving force of these drive gears is set to the same direction and
A color image forming device that is used to stabilize the position of an adult and a developing device. 2. A rotation transmission system and development for the image forming body.
Integrated with the rotation transmission system for the developer layer transport roller
Is supported by the side plate as a unit.
The color image forming apparatus according to claim 1, wherein the color image forming apparatus is a color image forming apparatus.