JPH11119499A - Belt photoreceptor cartridge - Google Patents

Abstract

(57) [Problem] To accurately secure the positional accuracy and the like between a belt photoreceptor and a developing unit even when a belt photoreceptor cartridge in which a belt photoreceptor is loaded in a casing is mounted on an image forming apparatus. I do. SOLUTION: At least a belt photoconductor, at least two or more rollers which stretch and hold the belt photoconductor,
In the belt photoreceptor cartridge 100 having the above, the cartridge casing 110 supporting the belt photoreceptor and the roller is integrally formed, and two or more positioning portions (151A, 151A, 152A) (151B,
152B) is installed, and when the belt photoreceptor cartridge 100 is mounted on the image forming apparatus, the positioning portion is moved to guides (551A, 552A) (5) of the apparatus main body.
51B, 552B) to be mounted in a fixed position by being inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt photoreceptor cartridge which can be mounted and removed from an image forming apparatus for forming an image by an electrophotographic method.

[0002]

2. Description of the Related Art In an electrophotographic image forming apparatus,
A toner image is formed on a photoreceptor drum, or a toner image is formed on a belt photoreceptor, and is transferred onto a recording paper and fixed. The belt photoreceptor is stretched between a plurality of rollers and driven to rotate.However, the shape of the belt photoreceptor to be stretched is freely selected depending on the positional relationship of the rollers to be arranged. A belt photoreceptor is used for the purpose of ensuring the separation of the recording paper after the transfer.

In order to replace or clean the belt photoreceptor with a new one, a belt photoreceptor cartridge is mounted or removed from an image forming apparatus main body. At this time, it is desired that the cartridge casing that supports the belt photoreceptor and the like be formed integrally from the viewpoint of reducing the work process. However, since the cartridge casing has a considerable size, the cartridge casing is easily distorted. When a belt photoreceptor or the like is loaded in such a cartridge casing and is mounted on an image forming apparatus, distortion remains even in the mounted state, causing the belt photoreceptor to be displaced, or the belt photoreceptor and the developing device However, there is a problem that it is difficult to accurately maintain the positional relationship accuracy such as above.

[0004]

SUMMARY OF THE INVENTION The present invention makes it possible to easily mount a cartridge in an image forming apparatus, correct distortion of a cartridge in the mounted state, prevent deviation, and improve the positional accuracy with respect to a developing device. An object of the present invention is to provide a belt photoreceptor cartridge that can be stored accurately.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a belt photoreceptor cartridge having at least a belt photoreceptor and at least two or more rollers for holding the belt photoreceptor in a stretched state. A cartridge casing that supports the rollers is integrally formed, and two or more positioning portions are provided on both side plates of the cartridge casing, respectively, when the belt photoreceptor cartridge is mounted on an image forming apparatus, This is achieved by a belt photoreceptor cartridge wherein the positioning portion is mounted at a fixed position along a guide of the apparatus main body.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the description of a belt photoreceptor cartridge according to the present invention, a color image forming apparatus for forming a color image by mounting the belt photoreceptor cartridge, an image forming process and mechanism, and a sectional view of FIG. This will be described with reference to a configuration diagram.

Belt photoconductor 10 as a belt-shaped image carrier
Is a flexible photoreceptor belt stretched around the drive roller 11 and the rotation rollers 12 and 13, which is tensioned by the action of the tension roller 14 and locally attached to the backup member 40 provided on the inner peripheral surface. Rotate clockwise while abutting. The belt photoreceptor 10 is made of tin oxide, a flexible substrate such as polyester, polyimide, and polyethylene terephthalate.
A metal thin film such as lead oxide or indium oxide is provided as a conductive layer, and various organic photosensitive layers (OPC) are applied on the upper surface thereof.
The conductive layer is grounded. The belt photoreceptor 10 used in this embodiment is made of polyethylene terephthalate having a thickness of 80 μm as a base, and is coated with OPC, and is precisely controlled to have a uniform thickness of 100 μm.

On the side of the stretched belt photoreceptor 10, 4
An image forming means comprising a set of charging means, image exposing means and developing means is provided.

A scorotron charger 21 as a charging means
(Y), 21 (M), 21 (C), and 21 (K) are used in image forming processes of yellow (Y), magenta (M), cyan (C), and black (K), respectively. A charging action is performed on the organic photoreceptor layer of the body 10 by a control grid maintained at a predetermined potential and corona discharge by a discharge wire, and a uniform potential is applied to the belt photoreceptor 10.

Exposure optical systems 22 (Y) as image exposure means,
Reference numerals 22 (M), 22 (C) and 22 (K) depict laser beams emitted from the semiconductor lasers for rotational scanning by a polygon mirror rotated by a drive motor, and perform image scanning on the belt photoreceptor 10 via an fθ lens. Perform exposure. In this image exposure, an image signal of each color read by a separate image reading device is subjected to image processing, and an exposure optical system 22 is formed.
(Y), 22 (M), 22 (C) and 22 (K) are input as electric signals, respectively.

A developing unit 23 (developing means) which uses a non-contact developing method and accommodates one-component or two-component developers of yellow (Y), magenta (M), cyan (C) and black (K), respectively. Y), 23 (M), 23 (C) and 23
(K) are vertically arranged on one side of the vertically arranged belt photoreceptor 10 so as to be perpendicular to the moving direction of the belt photoreceptor 10 and parallel to the belt surface. A developing sleeve 231 that rotates in the same direction with a predetermined gap with respect to the peripheral surface of the body 10 by means described later.
(Y), 231 (M), 231 (C) and 231 (K)
(Only one part is shown).

Developing units 23 (Y), 23 (M), 23
(C) and 23 (K) show the scorotron charger 21
(Y), charging by 21 (M), 21 (C) and 21 (K), exposure optical systems 22 (Y), 22 (M), 22 (C)
And (K), the electrostatic latent image on the belt photoreceptor 10 is reversely developed in a non-contact state by applying a developing bias voltage.

At the start of image recording, the drive motor rotates and the belt photoreceptor 10 rotates clockwise via the drive roller 11, and is applied to the belt photoreceptor 10 by the charging action of the scorotron charger 21 (Y). Is started to be applied. After the belt photoreceptor 10 is applied with a potential, the exposure optical system 22 (Y) starts exposure with an electric signal corresponding to a first color signal, that is, an image signal of yellow (Y), and rotates the belt (sub-scanning). ), An electrostatic latent image corresponding to the yellow (Y) image of the developed image is formed on the photosensitive layer on the surface. This latent image is reversely developed in a non-contact state with the developer adhered and conveyed onto the developing sleeve 231 (Y) by the developing device 23 (Y), and the yellow (Y) toner is changed in accordance with the rotation of the belt photoconductor 10. An image is formed.

Next, the belt photoreceptor 10 is yellow (Y)
Scorotron charger 21 (M) on the toner image of
A potential is applied by the charging action of the exposure optical system 22.
Exposure is performed with an electric signal corresponding to the second color signal of (M), that is, the image signal of magenta (M), and the developing device 23
By the non-contact reversal development by (M), a magenta (M) toner image is superposed on the yellow (Y) toner image.

The scorotron charger 21 (C), the exposure optical system 22 (C) and the developing device 23
(C) further forms a cyan (C) toner image corresponding to the third color signal, and the scorotron charger 21
(K), a black (K) toner image corresponding to the fourth color signal is sequentially superimposed by the exposure optical system 22 (K) and the developing device 23 (K), and is formed within one rotation of the belt photoconductor 10. Then, a color toner image is formed on the peripheral surface.

Developing units 23 (Y), 23 (M), 23
For (C) and 23 (K), the developer for replenishment of each color is supplied to the toner replenishing tanks 24 (Y), 24 (M), 24 (C).
And 24 (K). Developing unit 23 (Y), 2
3 (M), 23 (C) and 23 (K), the developing sleeves 231 (Y) and 231 respectively.
(M), 231 (C) and 231 (K) are applied with a developing bias to which a direct current or a further alternating current is applied, and a one-component or two-component developer adhered on the developing sleeve 231 is subjected to jumping development. Non-contact reversal development is performed on the belt photoreceptor 10 with the conductive layer grounded, from the developing sleeve 231 to which a DC bias of the same polarity as the charging of the belt photoreceptor 10 is applied, to attach toner to an exposed portion on the photoreceptor. Will be

The color toner image formed on the peripheral surface of the belt photoreceptor 10 is
After the potential of the adhered toner is adjusted by (F), static elimination is performed by the pre-transfer exposure device 25, and the
The paper is fed out from paper feed cassettes 31A and 31B or a manual feed unit 32 as a paper feed device, is conveyed to a timing roller 33, and is fed in synchronization with a toner image area on the belt photoconductor 10 by driving the timing roller 33. The image is transferred onto the transfer paper by a transfer roller 26 disposed opposite to a lower portion of the drive roller 11 for driving the belt photoreceptor 10.

The transfer paper to which the toner image has been transferred is separated from the peripheral surface of the belt photoreceptor 10 along the curvature of the drive roller 11 and then conveyed to a fixing device 34 where it is heated and pressed by the fixing device 34. The toner is fused and fixed onto the transfer paper, and is discharged from the fixing device 34.
The paper is conveyed by A, 35B, and 35C, and is discharged to a paper discharge unit 36 provided at an upper portion with the toner image surface on the transfer paper facing downward.

On the other hand, the belt photoreceptor 10 from which the transfer paper is separated
In the cleaning device 27, the surface of the belt photoreceptor 10 is rubbed by the cleaning blade 271 to remove and clean the remaining toner, and the formation of the toner image of the next original image is continued, or the image is temporarily stopped and waited I do. When the formation of the toner image of the next original image is subsequently performed, the pre-charging exposure unit 28 exposes the photoconductor surface of the belt photoconductor 10 to remove the previous history.

In the above-described color image forming apparatus, the belt photoreceptor cartridge, which will be described later, is mounted on the main body of the apparatus, thereby preventing the belt photoreceptor from being shifted. The developing gap Dsd formed between each developing sleeve 231 and the developing gap 231 is maintained within a high-precision variation range of ± 20 μm or less over the entire area of the developing sleeve 231 at a set gap of 500 to 600 μm suitable for non-contact development. According to the study by the present inventor, it has been confirmed that if the accuracy is maintained within the variation range of the accuracy with respect to the set developing gap Dsd, it is possible to develop a good toner image without unevenness. It has been confirmed.

FIG. 2 is an enlarged sectional view of the developing unit 23 facing the belt photoreceptor 10 shown in FIG. The backup member 40, which is a contact support member provided inside the belt photoconductor 10, has at least a developing sleeve 231.
(Y), 231 (M), 231 (C) and 231 (K)
Is provided with a semi-cylindrical contact support portion 41 (Y, M, C, K) having a radius of 1.5 mm and protruding in a fin shape facing the
The belt photoconductor 10 is provided on the rear surface so as to abut each other in a direction orthogonal to the rotation direction of the belt photoconductor 10. In the color image forming apparatus described above, the exposure optical systems 22 (Y), 22 (M), 22 (C) and
On the back side of the portion where the scanning light by (K) is subjected to image exposure on the photosensitive layer of the belt photoreceptor 10, the abutting support portion 41 is provided for the purpose of preventing vibration or fluctuation occurring during rotation of the photoreceptor surface. A semi-cylindrical contact support portion 42 having the same small radius as
(Y), 42 (M), 42 (C), and 42 (K) are provided so as to abut each other in a direction orthogonal to the rotation direction of the belt photoreceptor 10, and between the rotation rollers 12 and 13. On the stretched belt photoreceptor 10, a constant tension is applied to the belt by the tension roller 14 on one side, and the contact support portions 42 (Y), 41 () on the other side on which image formation is performed. Y), 42 (M), 41 (M), 4
At eight locations 2 (C), 41 (C), 42 (K), and 41 (K), the belt is brought into contact with the back surface of the photoreceptor 10, and the driving roller 11 rotates at a constant speed with a large winding angle. The belt photoconductor 10 is rotated clockwise at a constant speed.

In the belt photoreceptor 10 on which image formation is performed, the belt is stretched to a substantially flat shape by the tension between the above eight contact points, and the tension by the tension roller 14 also rises. Is set to a condition that does not exist. In this way, the resistance at the time of rotation of the belt photoconductor 10 is reduced, the slip at the contact portion between the drive roller 11 and the belt photoconductor 10 is eliminated, and the belt photoconductor 1 is driven at a constant speed.
0 is rotated so that the toner image to be superimposed is not displaced, and the developing gap Dsd is accurately and constantly maintained as follows.

FIG. 3 shows an axial sectional view (a) and a sectional view (b) of the developing region formed by the developing sleeve 231 in the direction perpendicular to the axis. Ball bearings 232 are provided as abutting members at both ends of a cylindrically rotating developing sleeve 231. The inner ring of the ball bearing 232 is formed on the developing sleeve 231, and the outer ring is formed on the casing 233 of the developing device 23. Fixedly mounted, ball bearing 23
A part of 2 is abutting support portion 4 by a separately provided biasing mechanism.
3 and the outer ring of the ball bearing 232 serving as the abutting member abuts against the abutting support portion 43, so that a developing gap Dsd is formed between the outer periphery of the developing sleeve 231 and the photoconductor surface of the belt photoconductor 10. You. In this manner, the developing unit is biased toward the belt photoreceptor 10 to hold the developing gap Dsd with high precision. Therefore, the developing unit 23 is provided with a unit for retracting rightward in FIG. Even if the retracting or contact operation is not performed, the belt photoreceptor cartridge 100, which will be described next, can be easily mounted and dismounted upward in FIG. 1 with respect to the apparatus main body, and the specified developing gap Dsd is maintained in the mounted state. You.

FIG. 4 shows a cross section of the belt photoreceptor cartridge 100 according to the present embodiment. The belt photoreceptor 10 is stretched around a driving roller 11 and rotating rollers 12 and 13. A cleaning device 27 that removes and cleans the residual toner adhered thereon and a waste toner box 29 that collects waste toner removed by the cleaning device 27 are attached to the belt photoreceptor cartridge 100. In the belt photoreceptor cartridge 100 of the present invention, the backup member 40, the driving roller 11, and the rotating roller 1
The support members supporting the members 2 and 13 are integrally formed as a cartridge casing 110. FIG. 5 shows a perspective view of the cartridge casing 110 formed integrally.

The cartridge casing 110 has side plates 110 A, 1 arranged in parallel on both sides of a backup member 40 having a width wider than the belt width of the belt photoreceptor 10.
10B. On the side plates 110A and 110B,
Two positioning projections 151A, 152A and 151B, 152B projecting outward at symmetrical positions are fixedly mounted as mounting reference members for positioning when mounting the cartridge casing 110 to the apparatus main body. Further, the side plates 110A and 110B have a function of supporting both ends of the driving roller 11 and the rotating rollers 12 and 13 directly or via bearings. That is, round holes 111A, 112A, 113A for rotatably supporting one end of the driving roller 11 and the rotating rollers 12, 13 are formed in the side plate 110A.
Also, the notch grooves 111B, 112B, 1 are formed in the side plate 110B.
13B is provided. Further, a long hole 114A for pressing and supporting the tension roller 14 is provided on the side plate 110A.
Notch groove 114B is provided in side plate 110B.

The belt photoreceptor cartridge 1 of the present embodiment
00 is a side plate 110 of the cartridge casing 110.
The belt photoconductor 10 can be mounted from the side B. After the belt photoconductor 10 is mounted, the second side plate 150 is
The belt photoreceptor 10 is configured to be rotatable by being mounted on the first side plate 0B. FIG. 6 shows the second side plate 150.

Next, the belt photoreceptor cartridge 100 will be described according to the assembling order. Round holes 111A, 11A provided in side plate 110A of cartridge casing 110
The driving roller 11 and the rotating roller 1 are provided on 2A and 113A.
2 and 13 are inserted, and the other ends of the drive roller 11 and the rotating rollers 12 and 13 are cut out grooves 111B, 112B and 113 provided in the side plate 110B, respectively.
Insert into B. The outer periphery of the side plate 110B is the belt photoconductor 1
Since the circumference is set shorter than 0, the belt photoconductor 10 is inserted from the side plate 110B side, and is arranged so as to be wound around the driving roller 11 and the rotating rollers 12 and 13. Next, the tension roller 14 is inserted between the elongated hole 114A and the cutout groove 114B so as to be located outside the belt photoreceptor 10. A compression spring (not shown) is inserted into the elongated hole 114A on the rear side of the shaft to press the shaft end of the tension roller 14 toward the belt. In this state, the second side plate 15
0 is attached to the side plate 110B. Second side plate 1
50 are provided with mounting reference holes 151C and 152C, and are engaged with the positioning protrusions 151B and 152B provided as positioning references provided on the side plate 110B, so that the second side plate 150 can be mounted on the cartridge casing 110 with high accuracy. It will be attached to. Second side plate 15
By attaching 0, the belt photoconductor 10 is stretched without coming off these rollers. The shaft of the driving roller 11 penetrates the round hole 111C, and a gear 11G for transmitting power from the apparatus main body side is attached to the tip. The drive roller 11 shaft may be configured to penetrate the round hole 111A, and the gear 11G may be attached to the end thereof.

The cleaning device 27 and the waste toner box 29 are attached to the cartridge casing 110 assembled in this manner from the opening.
The cleaning device 27 and the waste toner box 29 are connected by a toner collecting plate 272 made of a PET material that comes into contact with the belt photoconductor 10 in a trail manner. In the belt photoreceptor cartridge 100 of the present embodiment, the scorotron chargers 21 (Y), 21 (M), 21 (C) and 21 (K).
The grid 211 is attached between the cartridge casing 110 and the second side plate 150 so as to uniformly charge the belt photoreceptor 10 with the photoreceptor, and the gap between the grid 211 and the photoreceptor is maintained at a constant interval with high precision. doing.

FIG. 7A shows a plate-like grid 211, and FIG. 7B shows a cartridge casing 1 of the grid 211.
10 shows a state of attachment to the second side plate 150 and 10. The grid 211 made of a thin metal plate having its electrode portion etched has elongated holes 211A at both ends. An abutting portion 1101A for regulating the distance between the grid 211 and the belt photoreceptor 10 is provided on the side plate 110A.
However, the second side plate 150 is also provided with an abutting portion 1501 for regulating the interval, and one elongated hole 211A of the grid 211 is provided with a protrusion 1102A provided on the side plate 110A.
Is inserted, and the second side plate 150 is inserted into the other elongated hole 211A.
, The spring plate 1502 urged outward is inserted, and the grid 211 is held in a state where the position is regulated.

The belt photoreceptor cartridge 100 assembled in this manner has an opening 50 on the upper surface of the image forming apparatus.
It is configured to be located at a predetermined position by being inserted from 1 along a guide. FIG. 8A shows a state in which the camera is being mounted, and FIG. 8B shows a state in which the camera is mounted at a predetermined position. The guide plates 500A, 500A are slightly spaced back and forth in the drawing of the belt photoreceptor cartridge 100 to be mounted.
00B, and guide plates 500A, 500B
Have positioning projections 151A, 152A and 1 respectively.
Guide grooves 551A, 5 engaging and guiding with 51B, 152B
52A, 551B, and 552B are provided. The handle 155A is provided on the upper side in the insertion direction of the side plate 110A of the belt photoreceptor cartridge 100, and is provided on the upper side in the insertion direction of the second side plate 150 located opposite thereto. Handle part 15
5C is configured to be gripped and inserted from above. Since the opening 501 has the required shape of the opening cross section, when the belt photosensitive member cartridge 100 is inserted from the opening 501, the positioning protrusion 151A is formed.
(151B) is in the guide groove 551A (551B), and the positioning projection 152A (152B) is in the guide groove 552A.
(552B) and is inserted using its own weight.

Guide groove 551A (551B) and guide groove 5
52A (552B) is a straight guide route that is nearly vertical near the opening 501, but is a slightly bent guide route near a predetermined mounting position, and the belt is located at a predetermined device position. The abutting support portion 43 of the photoreceptor cartridge 100 has four sets of developing devices 23 of Y, M, C, and K.
Abut on the ball bearings 232, and each has a predetermined developing gap D.
sd. At a predetermined position, the lower protrusion 152A (152B) is in the guide groove 552A (5
52B), a stop position is defined by contacting at three places corresponding to the groove rising portion and the groove end portion on both sides, and the upper protrusion 151A is formed.
(151B) abuts at two locations at the rising portions on both sides of the guide groove 551A (551B) and protrudes 152A (152).
The position of the belt photoreceptor cartridge 100 is regulated by defining the rotation angle around B). Further, at a predetermined mounting position of the belt photoreceptor 100, a gear 11G attached to the drive roller 11 meshes with a drive gear 500G provided on the apparatus main body side, and power transmission from the apparatus main body side is performed during image formation. The belt photoreceptor 10 rotates clockwise to form an image. FIG. 8B shows the driving gear 500G and the gear 11G in an engaged state. The gear 11G is located in the upper left direction with respect to the driving gear 500G, and the driving gear 500G rotates counterclockwise. As a result, a component force in the direction indicated by the arrow F acts at the time of image formation, and the belt photoreceptor cartridge 100 does not float in the apparatus main body, and stable image formation is performed. In the present embodiment, a cover member (not shown) is provided at the upper part of the apparatus main body. By closing the cover member after mounting the belt photoreceptor cartridge 100, the belt photoreceptor cartridge 100 is moved downward by a spring member. It has a structure that can be held down.

In the belt photoreceptor cartridge 100 of this embodiment, the guide groove 552A (552B), which is a long groove, is elastically slid on the groove rising portion in order to ensure the operation of loading and unloading the apparatus main body. Sliding contact member 1
58 is provided on the belt photoreceptor cartridge 100.
FIG. 8C shows the slide contact member 158 taken out. In the process of inserting the belt photoreceptor cartridge 100 into the apparatus main body, the guide groove 552A in which the positioning projection 152A (152B) is formed linearly. In the process of moving along (552B), the frictional force of the sliding contact member 158 acts to prevent the belt photoreceptor cartridge 100 from being dropped and damaged even if the hand is released during insertion. When the positioning protrusion 152A (152B) reaches the bent guide path of the guide groove 552A (552B), the contact of the sliding contact member 158 with the groove rising portion is released, and the sliding contact member 158 is moved to a predetermined mounting position without frictional force. The belt photoreceptor cartridge 100 is located.

[0033]

According to the first aspect of the present invention, two or more positioning portions are provided on both side plates of the casing, and the belt photoreceptor cartridge is mounted along the guides of the apparatus main body. With such a configuration, distortion of the entire casing, which is caused when the cartridge follows the guide, is eliminated, so that the cartridge becomes a proper shape and is mounted on the apparatus, and the belt photoconductor also shifts. In addition, the positional accuracy between the belt photoreceptor and the developing device can be ensured accurately, and good image formation can be achieved.

According to a second aspect of the present invention, one of the side plates is shaped so that the belt photoreceptor can be loaded into the casing from the side plate side, and after the belt photoreceptor has been loaded into the casing, the second side with reference to the positioning portion. The second side plate can be mounted at an appropriate position without providing any special means so that the face plate is connected to the side plate. Thus, the entire cartridge can be easily assembled.

According to a third aspect of the present invention, a handle portion is formed on the upper portion of the side plate or the upper portion of the second side plate of the belt photoreceptor cartridge having a considerable weight, and the handle portion is provided. The operability is improved on the lower side.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram of a color image forming apparatus on which a belt photoreceptor cartridge of the present invention is mounted.

FIG. 2 is a cross-sectional view of a developing device facing a belt photoconductor.

FIG. 3 is a cross-sectional view of a developing sleeve in a developing region.

FIG. 4 is a sectional view of a belt photoreceptor cartridge.

FIG. 5 is a perspective view of a cartridge casing.

FIG. 6 is a perspective view of a second side plate.

FIG. 7 is an explanatory diagram showing a state of a grid and grid attachment.

FIG. 8 is an explanatory view showing the mounting of the belt photoreceptor cartridge.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Belt photoreceptor 11 Drive roller 12, 13 Rotating roller 14 Tension roller 21 Scorotron charger 22 Exposure optical system 23 Developing device 27 Cleaning device 29 Waste toner box 40 Backup member 100 Belt photoreceptor cartridge 110 Cartridge casing 110A, 110B Side plate 150 Second side plate 151A, 151B, 152A, 152B Positioning projection 151C, 152C Mounting reference hole 211 Grid 500A, 500B Guide plate 500G Drive gear 501 Opening 511A, 551B, 552A, 552B Guide groove

Claims (3)

[Claims] 1. At least a belt photoconductor, at least two or more rollers that stretch and hold the belt photoconductor,
A cartridge casing for supporting the belt photoreceptor and the roller is integrally formed, and two or more positioning portions are provided on both side plates of the cartridge casing, respectively. A belt photoreceptor cartridge, wherein when the photoreceptor cartridge is mounted on the image forming apparatus, the positioning portion is mounted at a fixed position along a guide of the apparatus main body. 2. One of the side plates is shaped so that a belt photoreceptor can be loaded into the cartridge casing from the side plate side, and after the belt photoreceptor is loaded into the cartridge casing, the belt photoreceptor is referenced to the positioning portion. The belt photoreceptor cartridge according to claim 1, wherein a second side plate for supporting a grid is coupled to the side plate. 3. The belt photoreceptor cartridge according to claim 1, wherein a handle portion is formed on the side plate or on the second side plate when the belt photoreceptor cartridge is mounted. .