JPH09152810A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize color slurring on a color image caused by a bearing member so as to obtain a good image by providing a pressure means pressurizing the movable part of a position control member in the main scanning direction of an image forming body. SOLUTION: The outside peripheral parts of ball bearing members 123 and 124, the image forming body 10, an image forming body driving member 125, a pressuring and holding member 126, and the pressure members 127 and 128 are turnably and integrally formed. On the other hand, an image exposure means 12, optical supporting bodies 120A and 120B, a shaft 121, the inside peripheral parts of the members 123 and 124, a left side plate attaching member 101, and a right side plate attaching member 102 are integrally formed, and attached and fixed to the specified positions of device main body fixing side plates 1A and 1B. In this case, the members 127 and 128 pressure the members 123 and 124 from both right and left sides of the body 10 in the main scanning direction after the relative position adjustment of the means 12 and the fitting of the body 10 are performed, so that backlash of the body 10 in the main scanning direction can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic system for forming an image in an image forming apparatus such as a copying machine, a printer or a facsimile, in which a charging means, an image exposing device and a developing means are arranged around an image forming body. Image forming apparatus, in particular, an electrophotographic system for forming a color image by superposing toner images during one rotation of the image forming body by disposing a plurality of charging devices, an image exposing device and a developing device around the image forming body. The present invention relates to a holding structure for an image forming body that rotates in the sub-scanning direction in the color image forming apparatus.

[0002]

2. Description of the Related Art The following methods (A), (B) and (C) are known as methods for forming a multicolor image.

(A) Apparatus having a same number of photoconductors, chargers, developing units, etc. as the number of colors required for an image, and superimposing a single-color toner image formed on each photoconductor on a transfer body or the like to form a color image (B) A device for forming a color image by rotating one photoconductor a plurality of times and repeating charging, image exposure and development for each color. (C) Charging and image exposure for each color within one rotation of one photoconductor. And a device for sequentially forming and forming a color image. However, the device (A) has a drawback that the volume of the device is increased because a plurality of photosensitive members and transfer members need to be moved. The device (B) has a single charging unit, an image exposing unit, and a single photoreceptor, so that the volume of the device can be reduced. . The device (C) enables high-speed image formation, but requires that a plurality of sets of a charger, an image exposing unit, and a developing unit be arranged in one circumference of a photoreceptor, and a developing system in which an optical system for performing image exposing is in close proximity. There is a risk that the image quality may be deteriorated due to contamination by toner leaking from the developing unit. To avoid this, it is necessary to increase the distance between the image exposure means and the developing unit, which inevitably increases the diameter of the photoconductor and increases the size of the apparatus. There is a problem such as inconsistency of doing.

For the purpose of avoiding the above-mentioned problems in the apparatus (C), the base body of the image forming body is formed of a transparent material, and a plurality of image exposing means are housed therein.
An apparatus (D) has been proposed in which an image is transmitted through the substrate and exposed on a photosensitive layer formed on the outer periphery of the image forming body (Japanese Patent Laid-Open No. 5-307307).

Since the image forming apparatuses (C) and (D) can form a color image while the image forming body is rotated once, the image recording time can be shortened and high speed recording can be performed, and the image quality can be improved. Is also effective.

The image forming apparatus (D) is of a type in which a line-shaped image exposing means for each color is arranged inside an image forming body composed of a transparent substrate and an optical semiconductor (hereinafter referred to as an optical system inclusion type). Device has been proposed. The image forming apparatus having the optical system-containing exposure unit has an advantage that the image forming body can be downsized and the apparatus can be configured compactly.

[0007]

In the color image forming apparatus having a plurality of exposure means described above, the condensing position of each line-shaped light emitting means is exactly aligned with the image forming surface of the peripheral surface of the image forming body. Further, the respective arrangement positions of the respective linear light emitting means must be accurately arranged in parallel at a predetermined interval.
Further, the image forming body which is at the image forming position of the plurality of exposing means and forms a superposed image by the plurality of exposing means,
It is necessary to be supported accurately so that there is no image shift in the main scanning direction, and to be supported so as to be able to rotate accurately so that there is no focus shift.

Conventionally, a normal radial ball bearing is used as a bearing member that rotatably holds the image forming body. However, in the radial ball bearing, a movement error is likely to occur in the thrust direction, and an image is formed. A rattling of several tens of μm occurs in the main scanning direction of the body. When a color image is formed using the image forming body supported by such a bearing member, a color shift occurs in the superimposed images.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image forming apparatus having a plurality of exposing means, which minimizes color misregistration of a color image caused by the bearing member.

[0010]

The above object is to provide an image forming body which rotates in the sub-scanning direction, and a plurality of image exposing means which perform image exposure on the image forming bodies linearly arranged in the main scanning direction. An optical support for supporting the plurality of image exposure means at predetermined positions,
A position regulating member provided at an end of the optical support and having a rotating portion and a fixed portion for regulating an image forming position of the image exposing means on the image forming body; and a movable portion of the position regulating member. This is achieved by an image forming apparatus characterized in that a pressing means for pressing the image forming body in the main scanning direction is provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an example of the present invention, an image forming process and each mechanism of a color image forming apparatus suitable as an image forming apparatus of the following embodiments will be described with reference to FIGS.

FIG. 1 is a sectional structural view of a color image forming apparatus (color printer) 1 suitable as an image forming apparatus of this embodiment.

In the color image forming apparatus of this embodiment, a photosensitive drum having a conductive base and a photosensitive layer provided on the outer peripheral surface of a transparent substrate is used as an image forming body, and an image is formed inside the photosensitive drum. The exposure device has a structure in which an image forming process means such as a charging device, a developing device, a transfer device, a static eliminator, and a cleaning device is arranged outside.

The photosensitive drum 10, which is an image forming body, is provided with a cylindrical substrate formed of a transparent member of transparent acrylic resin inside, and a transparent conductive layer, an a-Si layer or an organic photosensitive layer (OPC). ) Is formed on the outer circumference of the substrate, and is rotated clockwise in FIG. 1 in a grounded state.

In the present embodiment, it is sufficient that the photoconductive layer of the photosensitive drum has an exposure light amount capable of imparting an appropriate contrast. Therefore, the light transmittance of the transparent substrate of the photosensitive drum in this embodiment does not need to be 100%, and may have a characteristic that some light is absorbed when the exposure beam is transmitted. As a material of the light-transmitting substrate, an acrylic resin, particularly one obtained by polymerization using a methyl methacrylate monomer is preferably used because it is excellent in transparency, strength, precision, surface properties, etc. Various translucent resins such as acryl, fluorine, polyester, polycarbonate, polyethylene terephthalate and the like can be used. The light-transmitting conductive layer was made of indium tin oxide (ITO), tin oxide, lead oxide, indium oxide, copper iodide, Au, Ag, Ni, Al, etc. A metal thin film is used, and as a film forming method, a vacuum vapor deposition method, an active reaction vapor deposition method, various sputtering methods, various CVs.
D method, dip coating method, spray coating method and the like are used.
Further, as the photoconductor layer, amorphous silicon (a
-Si) alloy photosensitive layer, amorphous selenium alloy photosensitive layer, and various organic photosensitive layers (OPC) can be used.

A scorotron charger 11 as a charging means
Y, 11M, 11C, and 11K are used in image forming processes of yellow (Y), magenta (M), cyan (C), and black (K), respectively. A charging operation is performed by a control grid maintained at a predetermined potential and corona discharge by a discharge wire, and a uniform potential is applied to the photosensitive drum 10.

Reference numerals 12Y, 12M, 12C and 12K are light emitting elements linearly arranged in the axial direction of the photosensitive drum 10,
It is a linear image exposure means (image exposure device) composed of a converging fiber lens array (selfoc lens) as a unity magnification image forming element. The image signals of the respective colors read by the separate image reading device are sequentially taken out from the memory, and the exposure devices 12Y, 12M, 12C,
It is input to 12K as an electric signal.

Developing devices 13Y, 1 which are developing means for each color
3M, 13C, and 13K respectively accommodate one-component or two-component developers of yellow (Y), magenta (M), cyan (C), and black (K). The developing sleeve 131 rotates in the same direction while maintaining a predetermined gap.

The developing units 13 (Y, M, C,
K) is the scorotron charger 11 (Y, M,
C, K) and the image exposure device 12 (Y, M, C,
The electrostatic latent image formed on the photoconductor drum 10 by image exposure with K) is reversely developed in a non-contact state by a non-contact developing method by applying a developing bias voltage.

As the original image, an image read by an image pickup device of an image reading apparatus separate from this apparatus or an image edited by a computer is temporarily stored as an image signal for each color of Y, M, C and K. Store and store in.

At the start of image recording, a photoconductor drive motor (not shown) is rotated to rotate the photoconductor drum 10 in the clockwise direction of FIG. 1, and at the same time, a scorotron charger 11Y disposed on the left side of the photoconductor drum 10 is rotated. Application of electric potential to the photoconductor drum 10 is started by the charging action.

After a potential is applied to the photosensitive drum 10, the first color signal, that is, Y
Exposure with an electric signal corresponding to the image signal is started, and an electrostatic latent image corresponding to the Y image of the original image is formed on the photosensitive layer on the surface of the photosensitive drum 10 by rotational scanning.

The latent image is reversely developed by the developing device 13Y with the developer on the developing sleeve 131 in a non-contact state to form a yellow (Y) toner image in accordance with the rotation of the photosensitive drum 10.

Then, the photosensitive drum 10 is exposed to the yellow (Y) toner image by being charged with a potential by the charging action of a scorotron charger 11M disposed on the left side of the photosensitive drum 10 and above Y. Exposure is performed by an electric signal corresponding to the second color signal of the apparatus 12M, that is, the image signal of M, and non-contact reversal development by the developing device 13M causes magenta (M) on the yellow (Y) toner image. Toner images are sequentially superposed and formed.

By the same process, the cyan (C) toner image corresponding to the third color signal is further exposed by the scorotron charger 11C, the image exposure device 12C and the developing device 13C arranged on the photosensitive drum 10. A scorotron charger 11K, an image exposure device 12K, and a developing device 1 arranged on the right side of the body drum 10 and below the C image forming unit.
By 3K, a black (K) toner image corresponding to the fourth color signal is sequentially superimposed, and a color toner image is formed on the peripheral surface within one rotation of the photosensitive drum 10.

These image exposure devices 12Y, 12M, 12
The exposure of the organic photosensitive layer of the photoconductor drum 10 with C and 12K is performed from the inside of the photoconductor drum 10 through the transparent substrate. Therefore, the exposure of the images corresponding to the second, third, and fourth color signals is performed without any influence from the previously formed toner image, and the same exposure as the image corresponding to the first color signal is performed. It is possible to form an electrostatic latent image.

Toners for replenishing each color are provided in the toner replenishing tank 14
Developing device 1 for colors corresponding to Y, 14M, 14C and 14K
3 (Y, M, C, K). Developing device 13 (Y,
M, C, and K) are kept in non-contact with the photoconductor drum 10 with a predetermined value, for example, 100 μm to 1000 μm by an abutting roller (not shown), and the developing device 13 for each color
At the time of the developing action by (Y, M, C, K), a developing bias in which a direct current or an alternating current is applied to the developing sleeve 131 is applied, and the non-contact developing by the one-component or two-component developer accommodated in the developing device is performed. Then, non-contact reversal development is performed in which a DC bias having the same polarity as that of the toner is applied to the photoconductor drum 10 having the transparent conductive layer grounded, and the toner is attached to the exposed portion.

A transfer sheet P, which is a transfer material, is sent out from a paper feed cassette 21 which is a transfer material storage means, and is conveyed to a timing roller 22. A color toner image formed on the peripheral surface of the photoconductor drum 10 is transferred onto a transfer paper P fed in synchronization with the toner image on the photoconductor drum 10 by the driving of the timing roller 22 in the transfer device 15. Transcribed.

The transfer paper P on which the toner image has been transferred is separated from the peripheral surface of the photoconductor drum by removing the charge in the static eliminator 16, and is then transferred to the fixing device 24 by the transfer belt 23 which is a transfer unit. It After being heated and pressed in the fixing device 24 to fuse and fix the toner on the transfer paper P,
The sheet is discharged from the fixing device 24, conveyed by a pair of sheet discharge conveyance rollers 25, and discharged onto a tray 27 at the upper portion of the apparatus via a sheet discharge roller 26 with the toner image surface facing down.

On the other hand, the photosensitive drum 1 from which the transfer paper P is separated
In the cleaning device 17, the cleaning blade 17a of the cleaning device 17 rubs the surface of the photoconductor drum 10 to remove residual toner, and the toner is cleaned to continue forming a toner image of a document image or temporarily stops and a toner image of a new document image is formed. Formation. The waste toner scraped off by the cleaning blade 17a and the cleaning roller 17b is discharged to a waste toner container 17d through a toner conveying screw 17c and a toner conveying pipe. After the cleaning, the cleaning blade 17a and the cleaning roller 17b are kept apart from the photosensitive drum 10 in order to prevent the photosensitive drum 10 from being damaged.

FIG. 2 (A) is a sectional view of the main part of the image exposure apparatus, and FIG. 2 (B) is a perspective view of FIG. 2 (A). Since the image exposure devices 12Y, 12M, 12C and 12K have the same structure, they will be referred to as the image exposure device 12 in the following description. As shown in FIG. 2, the exposure device 12 as an image exposure means for each color is composed of FLs arranged in the axial direction of the photoconductor drum 10.
(Fluorescence emission), EL (electroluminescence),
A linear exposure element in which light emitting elements such as PL (plasma discharge) and LED (light emitting diode) are arranged in an array, or LIS
A light emitting element that emits exposure light by a linear exposure element or the like in which elements having an optical shutter function such as A (magneto-optical effect shutter array), PLZT (transmissive piezoelectric element shutter array), and LCS (liquid crystal shutter) are arranged. 12a and a condensing fiber lens array (selfoc lens) 12b as an equal magnification imaging element are attached to a holding member 12c that holds the light emitting element 12a and a selfoc lens 12b as an equal magnification imaging element. Is mounted as a unit on the optical support 120 for fixing and holding the exposure device provided inside the photosensitive drum 10 by a method described later, and image signals of each color stored in the memory are stored in the memory. The signals are sequentially read out and input as electric signals to the exposure device 12 for each color. The emission wavelength of the light emitting element 12a used in this example is in the range of 600 to 900 nm.

The light emitting element 12a is, for example, an array in which LEDs are linearly arranged, and is formed on a substrate 12d made of, for example, ceramics, Pyrex glass or the like. Further, the SELFOC lens 12b is shown by a small black circle in the figure, and the substrate 12d of the light emitting element 12a is fixed to the holding member 12c by an adhesive shown by a diagonal line, whereby the image exposure device 12 is configured. The exposure device 12 for each color is held at a predetermined position by using an assembly jig to be described later, and is attached and fixed to the optical support body 120 with an adhesive or the like.

FIG. 3 shows the state before the image forming body 10 is attached.
The image exposure device 12 (Y, M, C, K) is attached to the optical support 120.
3A is a view showing a state where the image exposure apparatus is attached to the image exposure apparatus, FIG. 3A is a side view of the image exposure apparatus, and FIG. 3B is a front view of FIG. In the x-axis direction (main scanning direction), the photoconductor drum 10
Shows a direction in which the linear light emitting element 12a provided in the image exposure device 12 is positioned to be orthogonal to the moving direction of the photoconductor drum 10, and the y-axis direction (sub-scanning direction) is the photoconductor drum 10. Shows the movement direction of. The z-axis direction (focus position direction) indicates the diametrical movement of the photosensitive drum 10 of the image exposure device 12, and indicates the adjustment direction of the focus position of the SELFOC lens 12b.

FIG. 4 shows an image exposure device 12 (Y, M, C,
FIG. 3 is a cross-sectional view showing a state in which the image forming body 10 including K) is mounted between the apparatus main body fixed side plates 1A and 1B of the image forming apparatus. FIG. 5A shows an image exposure device 12 (Y, M, C, K).
FIG. 5B is a cross-sectional view showing a state before the image forming body 10 including the above is mounted between the fixed side plates 1A and 1B, FIG. 5B is its AA cross-sectional view, and FIG. 5C is B- B sectional view, FIG.
(D) is CC sectional drawing.

The optical support 120 is the image exposure device 12
It is divided into two left and right optical supports 120A and 120B supporting both ends of (Y, M, C, K), and both are inserted and supported by a shaft 121 which is a central axis. Both ends of the image exposure device 12 (Y, M, C, K) are
The optical supports 120A and 120B are attached and fixed to the outer peripheral surfaces thereof. The shaft 121 has two pins 1
21a and 121b are planted at predetermined positions, and the image exposure device 12 (Y, M, C, K) is attached to the shaft 121.
Then, the right pin 121b is brought into contact with the V-shaped groove on the right side of the optical support 120B on the right side in the figure, and the pin 121a on the left side is pressed against the right side of the optical support 120A on the left side in the figure. Contact is made and positioning is performed in the axial direction.

If the optical supports 120A, 120B and the shaft 121 are integrally formed from the beginning, this work is unnecessary.

The optical supports 120A, 120 which support and attach both ends of the image exposure device 12 (Y, M, C, K).
The support portions 120a and 120b of B have regular hexagonal prism-shaped side surfaces, and the support portions 120a and 120b are set in advance so as to be coplanar on a surface plate. The image exposure device 12 (Y, M, C, K) is fixed with an adhesive through a wedge-shaped spacer 122 after performing position adjustment described later.

The other end (the end on the left side in the figure) of the optical support 120A has a cylindrical surface 120 concentric with the shaft 121.
d is formed, and the inner ring portion (fixed portion) of the ball bearing member (position regulating member) 123 is press-fitted into the cylindrical surface portion 120d. The outer ring portion (movable portion) of the ball bearing member 123 is press-fitted into the inner diameter portion at the left end of the image forming body 10 in the drawing.

The other end portion (the end portion on the right side in the figure) of the optical support 120B has a cylindrical surface portion 120 concentric with the shaft 121.
c is formed, and the inner ring portion of the ball bearing member (position regulating member) 124 is press-fitted into the cylindrical surface portion 120c. The outer ring portion of the ball bearing member 124 is press-fitted into the inner diameter portion of the image forming body driving member 125. The image forming body driving member 125 is fitted and fixed to the inner diameter portion of the image forming body 10.

As the ball bearing members 123 and 124, an angular ball bearing or a deep groove type ball bearing having a structure having a strong holding force in the thrust direction is used.

A part of the outer diameter portion of the ball bearing member 123 is
The image forming body 1 is press-fitted into the ring-shaped pressure holding member 126.
0 is fixed by abutting on the left end surface in the figure. A pressing member 127 is provided on the left side of the pressing holding member 126 in the drawing.
It is fixed by 27S. The end surface of the pressing member 127 presses the outer ring portion of the ball bearing member 123. The ball bearing member 12 is adjusted by adjusting the tightening force of the screw 127S.
The pressing force F _{1 applied} to the outer ring portion of _{No. 3} is adjusted.

The pressing member 1 is also attached to the image forming member driving member 125 fixed to the right side of the image forming member 10 shown in FIGS.
The pressing member 128 having substantially the same shape as the screw 27 has a screw 128S.
Has been fixed by. The end surface of the pressing member 128 presses the outer ring portion of the ball bearing member 124. The screw 12
By adjusting the tightening force of 8S, the pressing force F ₂ to the outer ring portion of the ball bearing member 124 is adjusted.

The pressing forces F ₁ and F ₂ are 10 to 500 N
Adjusted within the range of (Newton). Pressing force is 10N
When it is below, the pressing force to the outer ring portion of the ball bearing member 123 is insufficient, and rattling in the thrust direction occurs. Pressing force is 5
When it is equal to or more than 00N, an excessive force is applied to the ball bearing member 123, the rotation in the radial direction becomes unsmooth, and when a larger load is applied, the image forming body 10 and the ball bearing member 1
23 will be deformed. The pressing forces F ₁ and F ₂ are screw 12 by using a torque driver set to a predetermined torque.
By tightening 7S and 128S, the ball bearing members 123 and 124 are always pressed with the predetermined pressing force via the pressing members 127 and 128.

The innermost portion of the left side plate mounting member 101 is fitted to the leftmost end of the shaft 121 shown in FIG. 4, and the flange portion of the left side plate mounting member 101 is positioned and fixed to the left side plate 1A of the image forming apparatus. To be done. Further, the innermost portion of the right side plate mounting member 102 is fitted to the rightmost end portion of the shaft 121 in the drawing, and the flange portion of the right side plate mounting member 102 abuts the right side plate 1B in the image forming apparatus. It is positioned and fixed to the right side plate 1B by a screw that is screwed into the right end portion. The pin 121c near the right end of the shaft 121
Fits into a mounting reference groove (not shown) provided in the inner diameter portion of the right side plate mounting member 102 to position the shaft 121 in the rotational direction.

With the above structure, the ball bearing members 123,
The outer ring portion of 124, the image forming body 10, the image forming body driving member 125, the pressing holding member 126, and the pressing members 127, 1
28 is formed integrally with and rotatable. On the other hand, the image exposure means 12 (Y, M, C, K), the optical support 120A,
120B, shaft 121, and ball bearing members 123, 1
The inner ring portion 24, the left side plate mounting member 101, and the right side plate mounting member 102 are integrally formed, and the apparatus main body fixed side plate 1
It is attached and fixed at a predetermined position of A and 1B.

With such a configuration, the image exposure means 12
After the relative position adjustment of (Y, M, C, K) and the fitting of the image forming body 10, the ball bearing members 123, 12 are pressed by the pressing members 127, 128 from the left and right sides of the image forming body 10 in the main scanning direction.
By pressing 4, the rattling of the image forming body 10 in the main scanning direction is removed. Therefore, if the device is assembled as shown in FIG. 5 and then mounted on the image forming apparatus main body, which is an actual machine, as shown in FIG. In this way, the pressing member 12
The image forming apparatus equipped with the angular ball bearing members 123 and 124 to which a preload is applied by 7,128 does not cause rattling in the main scanning direction even after long-term use, and thus minimizes color misregistration in the main scanning direction. can do.

If the image forming member driving member 125 and the pressing member 128 shown in FIGS. 4 and 5 are shaped like the image forming member driving member 125 shown in FIG. 6, the right pressing member 127 is operated by the left pressing member 127. Since the bearing member 124 is also pressed, the same effect can be obtained without providing a pressing member on the right side.

FIG. 7 is a partial sectional view showing still another embodiment of the holding means for the image forming body of the image forming apparatus according to the present invention. In the figure, the same reference numerals are given to the parts having the same functions as those in the above-mentioned embodiment. Further, points different from the above embodiment will be described.

A pressing member 127 that comes into contact with the outer ring portion of the ball bearing portion 123 fixed to one shaft end portion of the image forming body 10.
Is a plurality of springs 129 built in the pressure holding member 126.
Is pressed by the pressing force F ₁ . The pressing member 128 fixedly provided on the other shaft end of the image forming body 10 also has the same structure, and the ball bearing member 124 is formed by the pressing force of the plurality of springs.
Press the outer ring part of.

The bearing means of the image forming body used in the present invention is not necessarily limited to the photoconductor drum described in the above embodiment, but a drive for rotatably supporting the belt-like photoconductor. Also used for rollers. It can also be applied to an intermediate transfer member. Further, in the above-described embodiment, the image exposing device is arranged inside the image forming body, but the present invention is not limited to this, and the image exposing device is arranged outside the image forming body. It may be one.

[0051]

According to the image forming apparatus of the present invention, the play in the thrust direction of the bearing member that rotatably supports the image forming body is eliminated. As a result, it has become possible to provide an image forming apparatus having excellent image quality and resolution by minimizing the color shift of a color image caused by the conventional bearing member.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram of a color image forming apparatus suitable as an image forming apparatus according to the present exemplary embodiment.

FIG. 2 is a sectional view and a perspective view of a main part of the image exposure apparatus.

FIG. 3 is a side view and a front view showing a state where the image exposure device is attached to an optical support.

FIG. 4 is a cross-sectional view showing a state in which an image forming body including an image exposure device is mounted between fixed side plates of the image forming device.

5A is a cross-sectional view showing a state before an image forming body including an image exposure device is mounted between fixed side plates, and FIG.
-A sectional view, (C) is a BB sectional view, and (D) is a CC sectional view.

FIG. 6 is a partial cross-sectional view of an image forming body showing another embodiment according to the present invention.

FIG. 7 is a partial sectional view of an end portion of an image forming body showing still another embodiment according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 1A, 1B Mounting main body fixed side plate 10 Image forming body (photosensitive drum) 101 Left side plate mounting member 102 Right side plate mounting member 12, 12Y, 12M, 12C, 12K Image exposure means (image exposure device) 120, 120A , 120B Optical support 120a, 120b Supporting part 120c, 120d Cylindrical surface part 121 Shaft 122 Spacer 123, 124 Position regulating member (ball bearing member) 125 Image forming body driving member 126 Pressing holding member 127, 128 Pressing member 127S, 128S Screw 129 Spring

Front page continuation (72) Inventor Hiroyuki Tokimatsu 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company (72) Inventor Masayasu Onodera 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company (72) Inventor Toshihide Miura 5-14-14 Midoricho, Koganei-shi, Tokyo

Claims (7)

[Claims] 1. An image forming body that rotates in the sub-scanning direction, a plurality of image exposing means that perform image exposure on the image forming bodies that are linearly arranged in the main scanning direction, and a plurality of the image exposing means. A position restricting member having an optical support that supports the optical support at a predetermined position, and a rotation unit that is provided at an end of the optical support and that restricts an image forming position of the image exposing unit on the image forming body, and a fixing unit. And an pressing unit that presses the movable portion of the position regulating member in the main scanning direction of the image forming body. 2. The image forming apparatus according to claim 1, wherein the image exposing means, the optical support, the position regulating member, and the pressing means are provided inside the image forming body. 3. The position regulating member is provided near both ends of the image forming body that rotates in the sub-scanning direction, and the pressing means is provided near at least one end of the image forming body. The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. 4. At least one member of the position regulating members is a rotatable ball bearing member, and an inner ring portion of the ball bearing member is fixed to an end portion of the optical support, and the ball bearing member. The outer ring portion of the ball bearing member is fixed to the rotatable end portion of the image forming body, and the outer ring portion of the ball bearing member is pressed in the main scanning direction of the image forming body by the pressing means. The image forming apparatus according to claim 3. 5. The other member of the position regulating member is a rotatable ball bearing member, the inner ring portion of the ball bearing member being fixed to an end portion of the optical support, The outer ring portion is fixed to the end portion of the image forming body driving member that is rotatable with the image forming body, and the outer ring portion of the ball bearing member is pressed by the pressing means in the main scanning direction of the image forming body. The image forming apparatus according to claim 4, wherein the image forming apparatus is provided. 6. The image forming apparatus according to claim 4, wherein the ball bearing member is an angular ball bearing. 7. The image forming apparatus according to claim 1, wherein the pressing force with which the pressing unit presses the position restricting member is 10 to 500 Newtons.