JPH0980850A - Color image forming equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] The attachment adjustment of an exposure optical system as a plurality of image exposure units of a color image forming apparatus to a supporting member can be performed easily, easily and accurately, and color misregistration or density unevenness can be achieved. (EN) A high-quality color image forming apparatus having no image quality is obtained. In a color image forming apparatus in which a plurality of sets of a charger, a line-shaped image exposing unit, and a developing unit are arranged around an image forming body, a supporting member to which the image exposing unit is attached is a push screw fine adjusting member and a biasing member. A sub-scanning direction fine adjustment mechanism is provided at one end or both ends of the support member in the main scanning direction, and the timing of image exposure is controlled by electrically shifting in the main scanning direction and the sub scanning direction. A color image forming apparatus comprising:

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a plurality of charging means, image exposing means and developing means arranged on the peripheral surface of an image forming body to superimpose toner images during one rotation of the image forming body to form a color image. The present invention relates to an electrophotographic color image forming apparatus for forming an image.

[0002]

2. Description of the Related Art As an apparatus for recording a multicolor image, a charging means, an image exposing means and a developing means of the same number as the kinds of colors required for image formation are arranged around an image forming body to form an image. A color image forming apparatus of a type in which charging, image exposure, and development for each color are sequentially performed while the body makes one round to form toner images of colors by superposing the toner images, and the toner images are collectively transferred onto a transfer material. It has been known.

In such an apparatus, since the formation of the toner image of each color is continuously started with a slight time difference, the speed of color image formation is high, and a color image larger than the peripheral length of the image forming body is formed. It also has the feature that it can be formed.

On the other hand, the image forming body is a thin photosensitive drum,
Although the end is press-fitted with a flange member, deformation occurs at that time and is constantly pushed by the abutment roller of the sleeve roller, so the degree of deformation is further promoted. In order to prevent the deformation, the shapes of the drum-shaped image forming body and the flange member are variously devised, and a means for maintaining the processing accuracy and the assembly accuracy is taken in order to connect the both concentrically without distortion. Skilled skills are required, and the cost and effect are not sufficient.

When the image exposing means is arranged inside the drum-shaped image forming body, it becomes quite difficult to adjust the image forming position and the main and sub scanning directions.

[0006]

As described above, in the image forming apparatus, a large number of image forming equipments such as image exposing and developing means are arranged around the drum-shaped image forming body with high density. Therefore, in order to accurately perform stable operation of these equipment and obtain high image quality, precision machining finishing and assembly are performed so that the drum-shaped image forming body becomes a cylindrical body with accurate dimensions, It is essential that the relative position of is always kept constant. However, in order to satisfy it, it was costly, the configuration was complicated, and it was difficult to realize.

At the same time, when the image exposure means is housed inside the drum-shaped image forming body, it is of course necessary to accurately process and assemble the optical components which are the line-shaped image exposure means in advance. It is also necessary to finely adjust the optical components such as the LED array and the like after assembly while viewing the image. However, the adjustment is extremely difficult when a plurality of optical systems are pushed inside the drum-shaped image forming body.

The present invention has been made in view of the above circumstances, and has developed means capable of stably holding a drum-shaped image forming body in a highly accurate state with a simple structure, and particularly image exposure to them. It is an object of the present invention to provide an adjusting device and a holding device having a high image quality by the adjusting device, which can adjust the position of the device easily, accurately and stably.

[0009]

This object is achieved by any one of the following technical means (1) to (4).

(1) In a color image forming apparatus in which a plurality of chargers, linear image exposing means, and developing devices are arranged around an image forming body, a supporting member to which the image exposing means is mounted is a push screw fine adjusting member and A sub-scanning direction fine adjustment mechanism including an urging member is provided at one end or both ends of the support member in the main scanning direction, and the timing of image exposure is electrically performed in the main scanning direction and the sub-scanning direction. A color image forming apparatus characterized by being shifted and controlled.

(2) In the fine adjustment mechanism provided at one end of the supporting member in the main scanning direction, a biasing member and a fixed abutting member for abutting the one end portion of the image exposing means in the sub-scanning direction. A member is provided on the support member, and an urging member for pressing in the sub-scanning direction to the other end side surface of the image exposure unit and a push screw fine adjustment member are provided on the support member. The color image forming apparatus according to item (1).

(3) Fine adjustment mechanisms for a plurality of sets of image exposure means provided at one end in the main scanning direction are alternately arranged on one side of the support member and the other side in a zigzag pattern, and image exposure is performed. The color image forming apparatus according to item (2), wherein the means is disposed inside the image forming body.

(4) In the fine adjustment mechanism provided at both end portions of the support member in the main scanning direction, a biasing member and a push screw for pressing the side surfaces of both end portions of the image exposure unit in the main scanning direction in the sub scanning direction. The color image forming apparatus according to item (1), wherein a fine adjustment member is provided on the support member.

[0014]

EXAMPLES The present invention will be described below in detail with reference to examples, but embodiments of the present invention are not limited thereto.

Embodiments of each claim of the present invention, including the operation thereof, will be described with reference to FIGS.

FIG. 1 is a cross-sectional structural view of an embodiment of a color image forming apparatus of the present invention. In this case, the image forming body is a drum-shaped image forming body, that is, a photosensitive drum 10, which is an optical glass or a transparent acrylic resin. Organic photosensitive layer (OPC) consisting of a transparent conductive layer on the outer periphery of a substrate formed of a transparent member such as
Is applied and is rotated clockwise while being grounded.

In the present invention, in the photoconductor layer of the photoconductor drum, which is the image forming point of the exposure beam for image exposure, a proper contrast is given to the light attenuation characteristics (photocarrier generation) of the photoconductor layer. It suffices that the exposure light amount has a wavelength that can be used. Therefore, the light transmittance of the transparent substrate of the photoconductor drum in the present invention does not have to be 100%, and may have a characteristic that some light is absorbed when the exposure beam is transmitted. As the material of the translucent substrate, various translucent resins such as soda glass, Pyrex glass, borosilicate glass and fluorine, polyester, polycarbonate and polyethylene terephthalate used for general optical members can be used. Further, as the translucent conductive layer,
Indium tin oxide (ITO), tin oxide, lead oxide, indium oxide, copper iodide, Au, Ag, Ni,
A thin metal film that maintains translucency such as Al is used, and as a film forming method, a vacuum vapor deposition method, an active reaction vapor deposition method, various sputtering methods, various CVD methods, dip coating methods, spray coating methods, etc. are used. It As the photoconductor layer, an amorphous silicon (a-Si) alloy photosensitive layer, an amorphous selenium alloy photosensitive layer, and various organic photosensitive layers (OP
C) can be used.

Reference numeral 11 denotes a scorotron charger, which is a charging means. The scorotron charger 11 performs a charging operation on the above-mentioned organic photoreceptor layer of the photoreceptor drum 10 by a grid held at a predetermined potential and a corona discharge by a discharge wire. A uniform electric potential is applied to the drum 10.

Reference numeral 12 is an exposure optical system which is an image exposure means, and includes LEDs, FL, E arranged in the axial direction of the photosensitive drum 10.
It is composed of light emitting elements such as L and PL and a Selfoc lens. The image signals of the respective colors read by the separate image reading device are sequentially taken out from the memory and input as electric signals to the respective exposure optical systems 12.
The emission wavelengths of the light emitting devices used in this example have the same wavelength and are in the range of 500 to 900 nm.

Each of the exposure optical systems 12 described above is mounted on a common columnar support member 20, and each exposure optical system 1
2 (Y), 12 (M), 12 (C) and 12 (K) are arranged at equal intervals and are housed inside the base of the photosensitive drum 10. The exposure optical system 12 is an LC in addition to the above light emitting element.
It may be composed of a combination of optical shutter members such as D, LISA, PLZT and an imaging lens such as a SELFOC lens.

Reference numerals 13Y, 13M, 13C, and 13K denote developing units which are developing means for containing yellow (Y), magenta (M), cyan (C), and black (K) developers, respectively.
The developing sleeves 130 rotate in the same direction while maintaining a predetermined gap with respect to the peripheral surface of the photoconductor drum 10.

Each of the developing devices 13 is the charging device 1 described above.
The electrostatic latent image formed on the photosensitive drum 10 by the charging by 1 and the image exposure by the exposure optical system 12 is reversely developed in a non-contact state by applying a developing bias voltage.

Next, the process of the color image forming apparatus equipped with the image forming body of the present invention will be described.

In the image reading apparatus which is a separate body from this apparatus, the original image is an image read by the image pickup device or an image edited by a computer is once used as an image signal for each color of Y, M, C and K. Stored and stored in memory.

When the image recording is started, the photoconductor drive motor is rotated to rotate the photoconductor drum 10 clockwise.
At the same time, the application of a potential to the photosensitive drum 10 is started by the charging action of the charger 11 (Y).

After a potential is applied to the photosensitive drum 10, the exposure optical system 12 (Y) starts image exposure with an electric signal corresponding to the first color signal, that is, the image signal of yellow (Y), and the drum is started. An electrostatic latent image corresponding to the yellow (Y) image of the original image is formed on the photosensitive layer on the surface by the rotational scanning of.

The latent image is reversely developed by the developing device 13 (Y) in a state where the developer on the developing sleeve is not in contact with the latent image, and a yellow (Y) toner image is formed according to the rotation of the photosensitive drum 10.

Next, the photosensitive drum 10 is further given a potential on the yellow (Y) toner image by the charging action of the charger 11 (M), and the second image of the exposure optical system 12 (M).
Image signal is performed by an electric signal corresponding to the color signal of (1), that is, a magenta (M) image signal, and non-contact reversal development by the developing device 13 (M) causes magenta () on the yellow (Y) toner image. The toner images of M) are sequentially superposed and formed.

By the same process, the charger 11 (C),
The exposure optical system 12 (C) and the developing device 13 (C) further form a cyan (C) toner image corresponding to the third color signal.
Further, finally, a black (K) toner image corresponding to the fourth color signal is sequentially formed by the charging device 11 (K), the exposure optical system 12 (K), and the developing device 13 (K) to form a photoconductor. A color toner image is formed on the peripheral surface of the drum 10 within one rotation, and sometimes over one rotation.

The color toner image thus formed on the peripheral surface of the photosensitive drum 10 is a transfer material which is conveyed from the paper feed cassette 15 in the transfer device 14A and is fed in synchronization with the driving of the timing roller 16. It is transferred onto the transfer paper.

The transfer paper on which the toner image has been transferred is separated from the peripheral surface of the drum by removing the charge in the static eliminator 14B, and the toner is fused and fixed in the fixing device 17, and then the discharge roller 18 is fixed. Via the tray 20 on the top of the device
Is discharged above zero.

On the other hand, the photosensitive drum 10 from which the transfer paper is separated
The cleaning device 19 removes and cleans residual toner to continue forming the toner image of the original image, or temporarily stops and waits for formation of a new toner image of the original image.

The photoconductor drum 10 is composed of the chargers 1
1, a developing device 13, a cleaning device 19, a toner storage container 40 that supplies toner to each of the developing devices 13, and a waste toner container 50 that stores the toner collected by the cleaning device 19 are stored in the process cartridge 30. Thus, it is possible to integrally pull out and move from the apparatus main body, for example, in the horizontal direction, and further to take it out of the apparatus main body. This take-out structure will be described later.

FIG. 2 is a sectional view taken along the line AA in FIG. 1, in which the photosensitive drum 10 is fitted and fixed concentrically with the flange member 10A at the front end, and the flange member 10A is provided with a bearing B3. An intermediate portion near the end of the fixed shaft member 21 of the support member 20 of the exposure optical system 12 which is the image exposure means is concentrically supported, and the end of the fixed shaft member 21 is fixed to the wall surface of the process cartridge 30. The holes are concentrically fitted and directly fixed and supported. The rear end flange member 10B concentrically supports an intermediate portion near the opposite end of the fixed shaft member 21 via a bearing B4. At the same time, the opposite end of the fixed shaft member 21 is fixed and supported in a concentric fitting hole at the center of the disk member 30A that is attachable to and detachable from the process cartridge 30.

A gear 10T is integrally provided on either one of the flange members 10A and 10B, here 10B.

This FIG. 2 can be said to be a partial cross-sectional view showing the structure around the photosensitive drum, in which both ends of the photosensitive drum 10 are flange members 10A and 10B, which are concentric and have no center runout so that uniform and correct rotation is achieved. In addition to being able to do so, the assembly and adjustment can be performed in the simplest possible state.

That is, since the photosensitive drum 10 is molded of plastic by the centrifugal polymerization method except for the one made of glass, the dimensional accuracy of the outer diameter is high. Therefore, by fitting the flange members 10A and 10B on the basis of the outer diameter of the photosensitive drum 10, it is possible to relatively easily perform highly accurate coupling in which the runout is less likely to occur.

At the same time, the flange member 10 is formed on the outer diameter portion of the photosensitive drum 10 as shown in the perspective views of FIGS.
A and 10B are lightly press-fitted to each other, and the flange member 10
The pressing member 1 provided integrally with the flange members 10A and 10B from the inside of the A and 10B at a position corresponding to the contact surface of the abutment roller 131 of the inner diameter portion of the photosensitive drum 10.
The flange member 1 so that 0K elastically contacts.
It is formed integrally with 0A and 10B. Flange member 1
As described above, the gear 10T is integrally and concentrically provided on the 0B. The contact roller 131 is a sleeve roller 13.
The rollers provided concentrically at both ends of the photosensitive drum 1
The distance between the sleeve rollers 130 at the developing position is defined with respect to zero. The abutting force of the abutting roller is considerably large, which may cause deformation and distortion of the thin photosensitive drum.
The photosensitive drum is reinforced by 0A and 10B so that the correct shape is always maintained stably.

As a result, one of the basic conditions for maintaining high image quality in color image formation is established.

However, even under such a condition, when the image exposing device 12 is arranged around the image forming body, that is, the photosensitive drum 10, in particular, the image exposing device 12 is supported by the supporting pair 20. High-quality images cannot be obtained unless they are attached and adjusted in the correct positions. And, since the adjustment is adjustment of many members incorporated in a narrow space, many difficulties are involved.

The adjustment is performed by the focus position (position in the height direction),
Although the position in the main scanning direction and the position in the sub-scanning direction are correctly determined, the focus position is required to have an accuracy of ± 0.1 mm, so that the exposure optical system 12 as each image exposing means is partially processed and assembled and supported. When the exposure optical system 12 as each image exposure means and the supporting member 20 are assembled to the image forming apparatus main body 1, the exposure optical system as each image exposure means is left to the precision of the partial processing and assembly of the member 20. Reference numeral 12 adjusts only the amount of movement in and out of the sub-scanning direction, that is, the parallelism with respect to the photosensitive drum 10, and after the parallelism is adjusted, the displacements in the main scanning direction and the sub-scanning direction are electrically timed with reference to it. This is adjusted by shifting to remove color misregistration and density unevenness. By the way, the required accuracy in the main scanning direction and the sub-scanning direction is ± 40μ when the image finishing accuracy is 300 dpi.
m, and is ± 20 μm at 600 dpi.

That is, the exposure optical system 1 as each image exposure means
2 is attached to the support member 20 by mechanically obtaining the focus position and parallelism with the processing accuracy, and other alignment is performed by electrically adjusting the timing.

The mechanical adjusting means will be described with reference to the side view of FIG. 5, the top view of FIG. 6, the development view of FIG. 7 and the top view of FIG.

Exposure optical systems 12 (Y), 12 (M), 12 (C), 1 dedicated to Y, M, C and K as image exposure means
2 (K) are mounted on the respective flat-mounted mounting surfaces 20A on the upper surface of the hexagonal support 20.

Thereafter, (Y), (M) of the exposure optical system 12,
The distinction between (C) and (K) is omitted except when it is particularly necessary, and is simply expressed as the exposure optical system 12.

Each mounting surface 20A of the hexagonal column of the supporting member 20
Is processed and finished with high accuracy in parallelism, flatness, and even division. A block 22 for a push screw fine adjustment member 23 in the fine adjustment mechanism and an abutting member block 126 are fixedly provided on each mounting surface 20A. Each of the blocks 22 and 126 may be integrated with the support member 20, or separate parts may be fixed to the support member.

The exposure optical system 12 shown in FIGS.
Is placed on the mounting surface 20A of the support member 20, and the exposure optical system 1
The side surface of one end of No. 2 is pressed against the abutting member 126 by the urging force of a leaf spring 125B as an urging member. The leaf spring 125B is fastened to the mounting surface 20A of the support member 20 by, for example, a screw.

On the other hand, the side surface of the other one end of the exposure optical system 12 is screwed into a screw hole formed in the block 22, and the tip of the push screw fine adjusting member 23 and a leaf spring as a biasing member. It is sandwiched by 125 and pressed by the biasing force of the leaf spring 125. Then, by finely adjusting the screwing amount of the push screw fine adjusting member 23, the exposure optical system 12 as the image exposing means is moved and adjusted in the sub-scanning direction.

The vertical position (focusing direction) of the exposure optical system is determined by pressing the upper surfaces of both ends of the exposure optical system 12 by the leaf springs 124 provided at both ends of the mounting surface 20A of the supporting member 20. The exposure optical system 12 is uniquely determined, and the positioning of the exposure optical system 12 in the main scanning direction is performed by the mounting surface 20.
The exposure optical system 12 is sandwiched between the abutting member 127 provided at one end of A and the spring plate 128 provided at the other end of A, and this is performed by the urging force of the spring plate 128.

In this way, each focus position of the exposure optical system 12 in the main scanning direction is mechanically finely adjusted only in the sub scanning direction, relying only on the processing accuracy and the partial assembling accuracy.

It has been found that the mechanical adjustment can be completed at this stage and the timing between the main scanning direction and the sub-scanning direction can be electrically controlled to eliminate color misregistration and density unevenness.

The above is one embodiment of claim 1 or claim 2.

Next, an embodiment of claim 1 or claim 3 will be described with reference to the development view of FIG. This is because the push screw fine adjustment member 23 provided on the mounting surface 20A at one end of the exposure optical system 12 and the leaf spring 125 as a biasing member.
The fine adjustment mechanism is formed so that the adjacent exposure optical systems are located at opposite ends, that is, they are arranged in a staggered manner.

As a result, the mechanism concentrated at one end of the exposure optical system 12 is dispersed at both ends.
The exposure optical system is made compact and maintenance is easy.

FIG. 7 is a development view in which the exposure optical system 12 and the mounting surface 20A of the supporting member 20 for the exposure optical system 12 which are adjacent to each other are developed on one plane.

The above is one embodiment of claims 1 and 3.

Next, an embodiment of claim 4 will be described with reference to the top view of FIG.

This is one in which a fine adjustment mechanism comprising a push screw fine adjustment member 23 and a leaf spring 125 as an urging member is provided at both ends of the exposure optical system 12 to provide two adjustment points. This is different from the case where there is only one adjustment point in the embodiment of item 2 or 3.

This increases the freedom and accuracy of the initial positioning and makes the adjustment easier.

Now, as shown in FIGS. 9 and 10, the photosensitive drum 10 as the image forming member is the process cartridge 3
Although the cartridge is mounted and stored at 0, the cartridge can be moved obliquely upward or horizontally with respect to the color image forming apparatus main body. That is, the photoconductor drum 10 is movable in the direction perpendicular to its rotation axis. The structure of this movement will be described in detail.

By opening the side cover 80 forming the side member of the main body of the image forming apparatus, the process cartridge 30 is moved obliquely upward and then pulled out from the position, so that the process cartridge 30 is horizontally oriented toward the outside of the main body. Be moved to.

FIG. 9A shows a supporting structure of the process cartridge 30, and FIG. 9B shows a cross section BB which is a main part thereof. A pair of slanted front and rear substrates 60 in the main body of the image forming apparatus. The long holes 60A of the
A pair of lift plates 61, which are connected to A by engaging a pin P1 from the inside, are slidably supported from diagonally above to diagonally below.

Inside each of the elevating plates 61, a guide member 70 capable of expanding and contracting in two stages by three rails called accuride rails is attached, and further, a moving plate 71 is attached to each inner rail. Is fixed.

Each of the moving plates 71 has a pair of U-shaped cutouts at opposite positions, and each of the cutouts has a pin P.
The process cartridge 3 described above by engaging 2
Supports 0.

On the other hand, each of the elevating plates 61 is provided with a vertically long slot 61A, and the side cover 80 and the pin P3 on the arm which rotates about the rotation axis H as a fulcrum are loosely engaged with each other.

When the side cover 80 is rotated clockwise to be opened and placed at a horizontal stop position, the lifting plate 61 is slanted upward by the movement of the pin P3 so that the pin P1 slides in the elongated hole 60A. Then, it moves diagonally downward and then stops. In this process, the process cartridge 30
Is the timing roller 1 from the image forming position (I).
6, the transfer device 14A, the static eliminator 14B, and the like are moved around to set the drawing position (II).

When the process cartridge 30 is pulled out from the pull-out position (II), it is moved to the outside of the image forming apparatus main body while maintaining the horizontal state as shown in FIG. 6 by the extension of the guide member 70. In the process, the locking member 30B at the lower end of the cartridge 30 is attached to the side cover 80.
The recesses 81A and 81B of the elastic member 81 provided on the inner surface of the cartridge 30 are sequentially engaged so that the cartridge 30 can be restricted and stopped at a specified position.

That is, at the position where the locking member 30B engages with the recess 81A of the elastic member 81, the image transfer area of the main body of the image forming apparatus is opened and the upper cover 90 can be opened to process jammed paper. At the position where it engages with 81B, the above-mentioned exposure optical system 12 can be exchanged from the back surface of the cartridge 30, and it is further pulled out to bring the cartridge 30 into contact with the rising portion 80A of the side cover 80 at the stop position (II
In I), the waste toner container 50 can be taken out. Further, at the stop position (III), the engagement between the pin P2 and the moving plate 71 can be released to separate the cartridge 30 upward and remove it.

When the process cartridge 30 constrained at each of the specified positions and placed in a stopped state is moved so as to be pushed into the main body of the image forming apparatus, the process cartridge 30 is retracted to the above-mentioned pull-out position due to the contraction of the guide member 70. Will be restored. During this time, since the pin P1 is locked to the end of the elongated hole 60A of the substrate 60 by its own weight, the elevating plate 61 is kept stationary. Next, when the side cover 80 is rotated counterclockwise to be closed and brought into a vertical state, the pin P
3 is moved, the pin P1 of the lift plate 61 is moved to the above-mentioned long hole 60.
By sliding in A, it moves from diagonally above to diagonally below and stops at the initial position.
0 is returned to the image forming position (I) again without contacting the transfer device 14A or the like.

Therefore, inspection of the process cartridge 30
Each maintenance work such as replacement, jam paper processing, toner supply, waste toner collection, and the like can be easily performed by operating from one side surface of the apparatus main body.

In the present embodiment, the exposure optical system 12
The apparatus of the type in which the photosensitive drum 10 is placed inside the photosensitive drum 10 has been described.
Is also supported by a ring-shaped support member 20A concentrically provided on the outer periphery of the photoconductor drum 10 to perform image exposure from the outside to the photoconductor on the drum peripheral surface. As in the case of this embodiment, the cartridge is constructed as a cartridge, and the side surface member of the apparatus is opened to pull out in the horizontal direction from the image forming position and the work is performed by being restricted to the specified position.

[0072]

According to the present invention, the adjustment of the attachment of the exposure optical system as the plurality of image exposure means of the color image forming apparatus to the support member leaves the adjustment of the focus position to the processing accuracy.
Only the adjustment in the sub-scanning direction is performed by mechanical fine adjustment, and the timing adjustments in the main-scanning direction and the sub-scanning direction are electrically performed, so that it is possible to perform the adjustment easily, easily and accurately. As a result, a high-quality color image forming apparatus free from color misregistration and density unevenness can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of an embodiment of a color image forming apparatus of the present invention.

FIG. 2 is a sectional view showing a built-in structure of a photosensitive drum and an exposure optical system.

FIG. 3 is a perspective view of a flange member.

FIG. 4 is a perspective view of a flange member.

FIG. 5 is a side view showing an adjustment state of attachment of the exposure optical system to a support.

FIG. 6 is a top view showing a state where the exposure optical system is attached to a support and adjusted.

FIG. 7 is a development view showing a staggered mounting state of the exposure optical system on a support and an adjustment state thereof.

FIG. 8 is a top view showing a state where the exposure optical system is attached and adjusted to a support.

FIG. 9 is an explanatory diagram showing a relationship between an image forming position and a drawing position of the process cartridge.

FIG. 10 is an explanatory view showing a structure for pulling out a process cartridge and restrictions on specific positions.

FIG. 11 is a sectional configuration diagram of another embodiment of the color image forming apparatus of the present invention.

[Explanation of symbols]

1 Color Image Forming Apparatus Main Body 10 Photosensitive Drum 11 Charging Device 12 Exposure Optical System as Image Exposure Means 13 Developing Device 20 Supporting Member 20A Mounting Surface 21 Fixed Shaft Member 22 Block 23 Push Screw Fine Adjusting Member 30 Process Cartridges 124, 125 , 125B, 128 Plate springs 126, 127 as biasing members

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Hama ▼ Shuta Ta, 2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica stock company (72) Inventor Toshihide Miura 5-14-14 Midori-cho, Koganei-shi, Tokyo

Claims (4)

[Claims] 1. A color image forming apparatus in which a plurality of sets of a charger, a line-shaped image exposing unit, and a developing unit are arranged around an image forming body, and a supporting member to which the image exposing unit is attached, a fine adjusting screw and a attaching member. A sub-scanning direction fine adjustment mechanism including a biasing member is provided at one end or both ends of the support member in the main scanning direction, and the image exposure timing is electrically shifted in the main scanning direction and the sub-scanning direction. A color image forming apparatus characterized in that it is controlled by the following. 2. In the fine adjustment mechanism provided at one end of the support member in the main scanning direction, a biasing member and a fixed abutting member that abut on one end side surface of the image exposure unit in the sub-scanning direction. Is provided on the support member, and a biasing member for pressing in the sub-scanning direction against the other end side surface of the image exposure unit and a push screw fine adjustment member are provided on the support member. The color image forming apparatus according to claim 1. 3. The fine adjustment mechanism of a plurality of sets of image exposure means provided at one end of the main scanning direction is alternately arranged on one side of the support member and the other side, and the image exposure is performed. The color image forming apparatus according to claim 2, wherein the means is arranged inside the image forming body. 4. In the fine adjustment mechanism provided at both ends of the support member in the main scanning direction, a biasing member and a push screw for abutting the side surfaces of both ends of the image exposure unit in the main scanning direction in the sub scanning direction. The color image forming apparatus according to claim 1, wherein a fine adjustment member is provided on the support member.