JP2002311717A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device constituted so that the accumulation of the component tolerance is reduced to the minimum and controlled to be within a necessary tolerance with no adjustment, in the positioning of an entrance seal of a cleaning device for an intermediate transfer belt. SOLUTION: The backing member 550 of the intermediate transfer belt 51 is arranged on an intermediate transfer unit 500 side so as to prevent the waving of the intermediate transfer belt 51. A roller 551 equipped with a bracket 55 for the entrance seal 52 is brought into contact with the non-image forming part of the intermediate transfer belt 51 corresponding to the position of the backing member 550, and then, the entrance seal 52 is positioned. The biting quantity of the entrance seal 52 to the intermediate transfer belt 51 is varied by changing the diameter of the roller 551 attached to the bracket 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a printer, and a facsimile, and more particularly, to an image forming apparatus using an intermediate transfer member.

[0002]

2. Description of the Related Art As in an electrophotographic color image forming apparatus, a toner image of each color formed on a photoreceptor is temporarily superimposed on an intermediate transfer belt to perform primary transfer. For an image forming apparatus using an intermediate transfer system that performs secondary transfer in which this full-color image is collectively transferred onto a transfer material, a cleaning blade and an inlet seal are used as a means for removing transfer residual toner on the intermediate transfer belt. There has been proposed a cleaning device that includes a contact / separation operation unit and a contact / separation control unit that move the cleaning blade and the entrance seal toward and away from the intermediate transfer belt.

FIGS. 6 and 7 are sectional views showing a positioning structure of an inlet seal in a cleaning device employed in the above-described conventional image forming apparatus. FIG. 6 shows a state in which the entrance seal 52 is separated from the intermediate transfer belt 51. A lever 54 attached to a case or the like of the belt cleaning unit is also rotatable about a rotation fulcrum 56 on a member 53 of the belt cleaning unit. Push the bracket 55 of the entrance seal 52 attached to the
Are separated from the intermediate transfer belt 51, and the position of the lever 54 for operating the entrance seal 52 is adjusted so that the entrance seal 52 is separated from the intermediate transfer belt 51 to a fixed position. FIG. 7 shows a state in which the entrance seal 52 is in contact with the intermediate transfer belt 51. The lever 54 is separated from the bracket 55, the bracket 55 is rotated by the tension of the spring 57, and the end of the bracket 55 is cleaned. By contacting a part of the member 53 constituting the unit, the entrance seal 5
The contact position with respect to the second intermediate transfer belt 51 is determined.

[0004] The condition of contact and separation of the entrance seal 52 with the intermediate transfer belt 51 plays an important role from the viewpoint of preventing the transfer residual toner from scattering from the belt cleaning unit. For example, the scattering of the residual toner from the entrance seal 52 is deteriorated even if the amount of penetration of the entrance seal 52 into the intermediate transfer belt 51 during contact is too large or too small.
On the other hand, if the separation amount is too large, the scattering amount of the transfer residual toner increases, while if the separation amount is insufficient, the toner contacts the image on the intermediate transfer belt 51 and causes a blurred image.

Therefore, in this conventional structure, in order to adjust the bite of the entrance seal 52 into the intermediate transfer belt 51, it is necessary to adjust the abutting height position by disposing a spacer or the like below the bracket 55 or the like. There is.

That is, in the conventional structure as described above,
It is necessary to mount a mechanism or the like for adjusting the position of the entrance seal 52, and it takes time and effort to assemble and adjust the parts, which increases the cost.

The intermediate transfer belt 5 is provided for each unit.
Since the position of No. 1 and the position of the inlet seal 52 are determined, their relative positions cannot be determined. Therefore, conventionally, it is impossible to directly control the bite amount and the separation amount of the entrance seal 52 with respect to the intermediate transfer belt 51, so that the position of the entrance seal 52 must be adjusted at the time of manufacture and managed so as to be within a certain tolerance. Therefore, the influence of the waving of the intermediate transfer belt 51 and the difference in the circumferential length of the intermediate transfer belt 51, and the like, the variation of the contact and separation conditions of the entrance seal 52 is increased.

In view of the above-mentioned conventional problems, the present invention makes it possible to use the positioning member of the intermediate transfer belt to position the entrance seal, thereby minimizing the accumulation of component tolerances and adjusting the entrance seal position without adjustment. Is intended to provide an image forming apparatus that can be set within a required tolerance.

[0009]

According to a first aspect of the present invention, there is provided an image forming apparatus, comprising the steps of: exposing a document image on a photoreceptor uniformly charged by a charger; An image forming unit that visualizes the electrostatic latent image by a developing device after forming a latent image, and toner of each color component formed on the photoconductor in the image forming unit by dividing the image several times The image is sequentially superimposed and transferred onto the rotationally driven intermediate transfer body, and an intermediate transfer body section for forming a color image on the intermediate transfer body is synchronized with the operation of the image forming section or the intermediate transfer body section. A recording paper transfer unit that collectively transfers the color image formed on the intermediate transfer body onto the recording paper conveyed and removed, and removes transfer residual toner remaining on the intermediate transfer body after color image transfer. Image forming apparatus having an intermediate transfer body cleaning unit The intermediate transfer member cleaning unit,
A belt backing member provided on the intermediate transfer body, the cleaning blade including a cleaning blade and an entrance seal member which can be freely attached to and detached from the surface of the intermediate transfer body; It is characterized by positioning by position.

According to a second aspect of the present invention, in order to achieve the above object, an image of an original is exposed on a photoreceptor uniformly charged by a charger to form an electrostatic latent image, and then the latent image is formed by a developing device. An image forming unit that visualizes the electrostatic latent image, and an intermediate transfer member that rotationally drives a toner image of each color component formed on the photoreceptor several times in the image forming unit. An intermediate transfer member for transferring a color image on the intermediate transfer member by sequentially superimposing and transferring the image on the intermediate transfer member, and the recording paper conveyed in synchronization with the operation of the image forming portion or the intermediate transfer member, An image having a recording paper transfer unit for collectively transferring a color image formed on an intermediate transfer body, and an intermediate transfer body cleaning unit for removing transfer residual toner remaining on the intermediate transfer body after color image transfer In the forming apparatus, the intermediate transfer body cleaning unit A cleaning blade and an inlet seal member that can be brought into contact with and separated from the surface of the intermediate transfer member, and a mechanism for positioning and closing the inlet seal member and a positioning member are provided on the intermediate transfer member side; The abutment and separation positions with respect to the transfer body are positioned with reference to the positioning member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, as an embodiment of an image forming apparatus according to the present invention, an example in which the present invention is applied to an electrophotographic color copying machine (hereinafter referred to as "color copying machine") will be described with reference to the drawings. Will be explained.

FIG. 1 is a schematic configuration diagram of a color copying machine according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of an image forming unit as a main part thereof. This color copying machine is constituted by a color image reading device (hereinafter, referred to as a scanner unit) 1, a color image forming unit (hereinafter, referred to as an image forming unit) 2, a paper feed bank 3, and a control unit for controlling the driving of these. is there.
In the following, portions common to the related art are denoted by the same reference numerals, and redundant description is omitted.

The scanner unit 1 includes a contact glass 121.
The image of the original 4 is illuminated by the illumination lamp 122 and the mirror group 123.
a, 123b, 123c and the lens 124 to form an image on the color sensor 125, and the color image information of the document 4 is converted into, for example, red (hereinafter referred to as R), green (Green).
It is read out for each color separation light of n or less G and blue (hereinafter B or less B) and converted into an electric image signal.
Here, the color sensor 125 is composed of R, G, and B color separation means and a photoelectric conversion element such as a CCD in this example.
The three color images obtained by color separation of the image of the original 4 are simultaneously read. Then, R obtained by the scanner unit 1
Based on the G and B color-separated image signal intensity levels, an image processing unit (not shown) performs a color conversion process to obtain black (Black).
Hereafter, color image data of Bk), yellow (hereinafter referred to as Y), cyan (hereinafter referred to as Cyan) and magenta (hereinafter referred to as Magenta) are obtained.

The operation of the scanner unit 1 for obtaining the Bk, Y, C, and M color image data is as follows.
In response to a scanner start signal that is timed with the operation of an image forming unit 2 described later, an optical system including an illumination lamp 122 and mirror groups 123a, 123b, 123c scans the document 4 in the left direction of the arrow in FIG. One color image data is obtained for each scan. By repeating this operation four times in total, for example, each color separation light of R, G, B is read and converted into an electric image signal. Or R,
G and B image data are stored in the memory. When a memory (not shown) is used, R, G, and B color image data are obtained by one scan. Then, each time the images are sequentially visualized by the image forming unit 2, they are superimposed to form a final four-color full-color image. Then, based on the intensity levels of the R, G, and B color separation image signals obtained by the scanner unit, a color conversion process is performed by the image processing unit 2, and Bk, Y, C,
M image data is obtained.

The image forming section 2 includes a photosensitive drum 200 as an image carrier and a charger 20 as a charging unit.
1. Cleaning blade 202 and fur brush 20
Cleaning device 210 consisting of a photoreceptor 3, a neutralization lamp 206, a potential sensor 204, and a development density pattern detector 2
05, writing optical unit 220 (only laser beam L for exposure is shown in the figure), revolver developing unit 400 as a developing unit, intermediate transfer unit 500, secondary transfer unit 600, fixing unit 700 using fixing roller pair 701 And so on.

The photoreceptor drum 200 rotates counterclockwise as indicated by the arrow in the figure. Around the periphery thereof, a charger 201, a photoreceptor cleaning device 210, a selected developing machine of the revolver developing unit 400, an intermediate An intermediate transfer belt 51 as an intermediate transfer body of the transfer unit 500 is disposed.

The writing optical unit 220 converts the color image data from the scanner unit 1 into an optical signal, and applies a laser beam corresponding to the image of the document on the surface of the photosensitive drum 200 uniformly charged by the charger 201. Light irradiation is performed by irradiating L to form an electrostatic latent image on the surface of the photosensitive drum 200. This writing optical unit 220
Are, for example, a semiconductor laser as a light source, a laser emission drive control unit, a polygon mirror and its rotation motor, f / θ
It is composed of a lens, a reflection mirror and the like.

Further, the revolver developing unit 400 has a Bk
Bk developing machine 401 using toner, C using toner C
The image forming apparatus includes a developing device 402, an M developing device 403 using M toner, a Y developing device 404 using Y toner, and a developing revolver driving unit that rotates the entire unit counterclockwise.

Each of the developing machines 401 to 404 installed in the revolver developing unit 400 serves as a developing material carrier which rotates by contacting the ears of the developer with the surface of the photosensitive drum 200 in order to develop an electrostatic latent image. , A developer paddle that rotates to pump up and agitate the developer, a developing sleeve driving unit that rotates the developing sleeve clockwise as indicated by an arrow, and the like.

In this embodiment, each of the developing machines 401 to 40
The toner in 4 is negatively charged by stirring with the ferrite carrier, and a developing bias power supply (not shown) is applied to each developing sleeve to a negative DC voltage Vdc (DC component) and an AC voltage Vac (DC component). A developing bias voltage on which the AC component is superimposed is applied, and each developing sleeve is biased to a predetermined voltage with respect to the metal base layer of the photosensitive drum 200.

In the standby state of the main body of the color copying machine,
The revolver developing unit 400 is stopped at the home position where the Bk developing machine 401 is located at the developing position, and when the copy start key is pressed, the document starts reading image data, and the laser starts based on the color image data. The optical writing by the light L, that is, the formation of the electrostatic latent image starts (hereinafter, the electrostatic latent image based on the Bk image data is referred to as “Bk electrostatic latent image”, and the same applies to C, M, and Y).

In order to enable development from the front end of the Bk electrostatic latent image, the rotation of the Bk developing sleeve is started before the front end of the electrostatic latent image reaches the Bk development position, and the Bk electrostatic latent image is started. Is developed with Bk toner. Thereafter, the developing operation of the Bk electrostatic latent image is continued, but when the rear end of the Bk electrostatic latent image passes the Bk developing position, the revolver development is performed immediately until the developing machine of the next color comes to the developing position. The unit 400 rotates. This is completed at least before the leading end of the electrostatic latent image based on the next image data reaches the developing position.

The intermediate transfer unit 500 comprises an intermediate transfer belt 51 which is an intermediate transfer member stretched over a plurality of rollers described later. Around the intermediate transfer belt 51, a transfer material carrier 2 of the secondary transfer unit 600 is provided.
A secondary transfer belt 601, a secondary transfer bias roller 605 as a secondary transfer charge applying unit, a belt cleaning blade 504 as an intermediate transfer body cleaning unit, a lubricant applying brush 505 as a lubricant applying unit, and the like are arranged so as to face each other. It is set up.

The intermediate transfer belt 51 includes a primary transfer bias applying roller 507, a belt driving roller 508, a belt tension roller 509, a secondary transfer facing roller 510, a cleaning facing roller 511, and primary transfer charge applying means.
And an earth roller 512. Each roller is formed of a conductive material, and each roller other than the primary transfer bias roller 507 is grounded.

The primary transfer bias roller 507 is supplied with a primary transfer power supply 801 controlled by a constant current or a constant voltage.
A transfer bias controlled to a predetermined magnitude of current or voltage is applied according to the number of superimposed toner images. Further, the intermediate transfer belt 51 is driven by a belt drive roller 508 that is rotationally driven in the direction of the arrow by a drive motor (not shown).
Drive in the direction of the arrow. The intermediate transfer belt 51 is formed as a single-layer or multilayer structure of a semiconductor or an insulator.

In a transfer section for transferring the toner image on the photosensitive drum 200 to the intermediate transfer belt 51 (hereinafter, referred to as a “primary transfer section”), the primary transfer bias roller 507 and the ground roller 512 expose the intermediate transfer belt 51 to light. Body drum 20
The nip portion having a predetermined width is formed between the photosensitive drum 200 and the intermediate transfer belt 51 by being stretched so as to be pressed against the zero side.

The lubricant applying brush 505 is formed by polishing zinc stearate 506 as a lubricant formed in a plate shape, and applying the polished fine particles to the intermediate transfer belt 51. The lubricant application brush 505 is also configured to be adjacent to the intermediate transfer belt 51, and is controlled so as to contact the intermediate transfer belt 51 at a predetermined timing.

The secondary transfer unit 600 comprises a secondary transfer belt 601 and the like stretched over three support rollers 602, 603 and 604, and a stretched portion between the support rollers 602 and 603 of the intermediate transfer belt 51. Is the secondary transfer facing roller 5
10 can be pressed against. One of the three support rollers 602, 603, and 604 is a driving roller that is rotationally driven by a driving unit (not shown), and drives the secondary transfer belt 601 in a direction indicated by an arrow in the drawing.

The secondary transfer bias roller 605 is a secondary transfer means, and is disposed so as to sandwich the intermediate transfer belt 51 and the secondary transfer belt 601 between the secondary transfer opposing roller 510 and is controlled at a constant current. A transfer bias of a predetermined current is applied by the secondary transfer power supply 802. Further, the supporting roller 602 and the secondary transfer bias roller 605 are arranged such that the secondary transfer belt 601 and the secondary transfer bias roller 605 can take a position where the secondary transfer belt 601 and the secondary transfer bias roller 605 are pressed against the secondary transfer opposing roller 510 and a position where the secondary transfer belt 601 and the secondary transfer bias roller 605 are separated. An unillustrated separation / contact mechanism driven in the direction of the arrow is provided. The secondary transfer belt 601 and the support roller 602 at the separated position are shown by two-dot chain lines in FIG. In the figure, reference numeral 650 denotes a pair of registration rollers,
Secondary transfer bias roller 605 and secondary transfer opposing roller 5
10 and the intermediate transfer belt 51 and the secondary transfer belt 6
01, the transfer paper P which is a transfer material at a predetermined timing.
Send.

The fixing roller pair 70 of the secondary transfer belt 601
A transfer sheet static elimination charger 606 as a transfer material static elimination means and a belt static elimination charger 607 as a transfer material carrier static elimination means are opposed to a portion stretched around the first support roller 603. Further, a cleaning blade 6 serving as a transfer material carrier cleaning unit is provided on a portion of the secondary transfer belt 601 which is stretched around the lower support roller 604 in the figure.
08 is in contact.

The transfer paper discharging charger 606 discharges the electric charges held in the transfer paper, so that the transfer paper can be satisfactorily separated from the secondary transfer belt 601 by the strength of the transfer paper itself. is there. The belt static elimination charger 607 eliminates electric charges remaining on the secondary transfer belt 601. The cleaning blade 60
Numeral 8 is for cleaning by removing the deposits attached to the surface of the secondary transfer belt 601.

When the image forming cycle is started in the color copying machine thus constructed, the photosensitive drum 2
Reference numeral 00 denotes a counterclockwise rotation indicated by an arrow by a driving motor (not shown), and the intermediate transfer belt 51 rotates clockwise as indicated by an arrow by a belt driving roller 508. With the rotation of the intermediate transfer belt 51, the primary transfer is performed by the transfer bias by the voltage applied to the primary transfer bias roller 507 for forming the Bk toner image, forming the C toner image, forming the M toner image, and forming the Y toner image. Finally Bk, C, M, Y
The toner images are formed on the intermediate transfer belt 51 in this order.

For example, a Bk toner image is formed as follows. The charging charger 201 uniformly charges the surface of the photosensitive drum 200 to a predetermined potential with negative charges by corona discharge. Then, by the writing optical unit 220, B
Raster exposure with laser light is performed based on the k color image signal. When this raster image is exposed, the exposed portion of the surface of the photosensitive drum 200, which is initially uniformly charged,
The charge proportional to the amount of exposure light disappears, and a Bk electrostatic latent image is formed. The Bk of the Bk developing device 401 is added to the Bk electrostatic latent image.
When the negatively charged Bk toner on the developing roller comes into contact, the toner does not adhere to the portion of the photosensitive drum 200 where the charge remains, and the toner adheres to the portion without the charge, that is, the exposed portion. , A Bk toner image similar to the electrostatic latent image is formed.

The B formed on the photosensitive drum 200
The k toner image is transferred onto the surface of the intermediate transfer belt 51 that is driven at a constant speed in contact with the photosensitive drum 200. Hereinafter, the transfer of the toner image from the photosensitive drum 200 to the intermediate transfer belt 51 is referred to as “belt transfer”.

A small amount of untransferred residual toner remaining on the surface of the photosensitive drum 200 after the belt transfer is used in preparation for reuse of the photosensitive drum 200.
Clean at 10.

On the other hand, on the photosensitive drum 200 side, the process proceeds to the C image forming process after the Bk image forming process, and reading of the C image data by the scanner unit is started at a predetermined timing. A C electrostatic latent image is formed on the surface of the photosensitive drum 200.

Then, after the trailing end of the previous Bk electrostatic latent image has passed and before the leading end of the C electrostatic latent image has arrived, the rotation operation of the revolver developing unit 400 is performed, and the C developing device 4 is rotated.
02 is set at the development position, and the C electrostatic latent image is developed with the C toner. Thereafter, the development of the C electrostatic latent image area is continued, but when the rear end of the C electrostatic latent image passes, the Bk developing machine 40
The rotation operation of the revolver developing unit is performed as in the case of 1, and the next M developing device 403 is moved to the developing position. This is also completed before the leading end of the next M electrostatic latent image reaches the developing position. Regarding the M and Y image forming processes, the operations of reading the color image data, forming the electrostatic latent image, and developing are the same as those of the above-described Bk and C processes, and thus the description is omitted.

On the intermediate transfer belt 51, Bk, C, M, and Y toner images sequentially formed on the photosensitive drum 200 are transferred onto the same surface while being sequentially aligned. As a result, a toner image is formed on the intermediate transfer belt 51 in which four colors are superimposed at the maximum.

At the time when the above-described image forming operation is started, the transfer paper P is fed from one of the paper feed cassettes 300 of the paper feed bank 3 or the manual feed tray 310, and the registration roller pair 6 is fed.
Stand by at 50 nips. Secondary transfer facing roller 510
And a nip formed by a secondary transfer bias roller 2
When the leading end of the toner image on the intermediate transfer belt 51 approaches the next transfer portion, the registration roller pair 650 is driven so that the leading end of the transfer paper P coincides with the leading end of the toner image. Registration with the image is performed.

When the transfer paper P passes through the secondary transfer portion while being superimposed on the toner image on the intermediate transfer belt 51,
The secondary transfer bias roller 60 is driven by the secondary transfer power source 802
The toner images of the four-color superimposition on the intermediate transfer belt 51 are collectively transferred onto the transfer paper by the transfer bias by the voltage applied to the transfer belt 5. Then, when the paper P passes through a portion facing the transfer paper discharging charger 606 disposed on the downstream side of the secondary transfer portion in the moving direction of the secondary transfer belt 601, the transfer paper P is discharged and separated from the secondary transfer belt 601. To the fixing roller pair 701.

The toner image is melted and fixed at the nip portion of the fixing roller pair 701, sent out of the apparatus body by the discharge roller pair 212, and stacked face up on a copy tray (not shown) to obtain a full color copy.

On the other hand, the photosensitive drum 200 after the belt transfer
Is cleaned by the photoreceptor cleaning device 210, and the charge is uniformly removed by the discharge lamp 206. Further, the toner remaining on the surface of the intermediate transfer belt 51 after transferring the toner image onto the transfer paper P is cleaned by a belt cleaning blade 504 pressed against the intermediate transfer belt 51 by a separation / contact mechanism (not shown).

At the time of repeat copying, the operation of the scanner unit 1 and the image formation on the photosensitive drum 200 are performed at a predetermined timing following the image forming process of the fourth sheet (Y) of the first sheet. Proceed to the image forming step (Bk). Further, the intermediate transfer belt 51 is provided with a second sheet of Bk toner image in an area cleaned by the belt cleaning blade 504 on the front surface following the batch transfer step of the first sheet of four-color toner image onto transfer paper. The belt is transferred. Thereafter, the operation is the same as that of the first sheet.

The above is the copy mode for obtaining a four-color full-color copy. In the three-color copy mode and the two-color copy mode, the same operation as described above is performed for the designated color and the number of times. Further, in the case of the single-color copy mode, only the developing device of the predetermined color of the revolver developing unit 400 is in the developing operation state until the predetermined number of sheets is completed, and the belt cleaning blade 504 is pressed against the intermediate transfer belt 51. The copy operation is performed with the position as it is.

FIG. 3 is an enlarged sectional view showing a cleaning device for the intermediate transfer belt 51 in one embodiment of the image forming apparatus according to the present invention. In this embodiment, the backing member 550 of the intermediate transfer belt 51 is
0 to prevent the intermediate transfer belt 51 from waving, and a part of the bracket 55 of the entrance seal 52 (the bracket 55 in FIG. 3) at the non-image forming portion of the intermediate transfer belt 51 corresponding to the position of the backing member 550. The entrance seal 52 is positioned by bringing the roller 551) attached to the abutment 55 into contact. The diameter of the roller 551 attached to the bracket 55 may be changed in order to change the amount of the entrance seal 52 biting into the intermediate transfer belt 51.

With this configuration, the inlet seal 5
Factors that cause the contact position 2 to vary (the manufacturing tolerance of the bracket 55, the curl amount of the inlet seal 52, the displacement of the rotation fulcrum 56, etc.) are reduced, and the variation in the contact condition is reduced, and no adjustment is required. It is possible to position the inlet seal 52 within the required tolerances.

FIGS. 4 and 5 are enlarged sectional views showing a cleaning device for the intermediate transfer belt 51 in another embodiment of the image forming apparatus according to the present invention. In the present embodiment, a cam 560 is provided on the intermediate transfer unit 500 side as a driving mechanism of the entrance seal 52 so as to reduce the variation of not only the contact position of the entrance seal 52 but also the separation position.

The cam 560 has its drive shaft provided coaxially with the roller 561 around which the intermediate transfer belt 51 is wound.
The cam 560 is driven to rotate so that the entrance seal 52 contacts and separates from the intermediate transfer belt 51. of course,
By changing the shape of the cam 560, it is possible to directly change the contact and separation conditions of the entrance seal 52 with the intermediate transfer belt 51.

With this configuration, the inlet seal 5
2 (the manufacturing tolerance of the cam 560 and the bracket 55 of the entrance seal 52 and the position of the rotation fulcrum 56) are reduced, and the entrance seal is not deteriorated under the condition that the scattering of the residual toner on the intermediate transfer belt 51 is not deteriorated. It is possible to separate the intermediate transfer belt 52 from the intermediate transfer belt 51 without any adjustment.

[0050]

Since the image forming apparatus according to the first aspect of the present invention is as described above, the contact position (bite amount) of the entrance seal of the intermediate transfer member cleaning section with the intermediate transfer member is set to the intermediate position. There is an effect that positioning can be performed within a required tolerance without adjustment regardless of the position of the transfer body.

An image forming apparatus according to a second aspect of the present invention comprises:
As described above, it is possible to position the cut-in amount and the separation position of the entrance seal of the intermediate transfer body cleaning unit into the intermediate transfer body within the required tolerance without adjustment regardless of the position of the intermediate transfer body. It has the effect of becoming.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a color copying machine according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an image forming unit which is a main part of the color copying machine of FIG.

FIG. 3 is an enlarged sectional view showing an intermediate transfer belt cleaning device in an embodiment of the image forming apparatus according to the present invention.

FIG. 4 is an enlarged sectional view of an intermediate transfer belt cleaning device in another embodiment of the image forming apparatus according to the present invention.

FIG. 5 is a cross-sectional view showing, on an enlarged scale, the state at the time of contact with the inlet seal.

FIG. 6 is an enlarged sectional view showing a conventional intermediate transfer belt cleaning device.

FIG. 7 is an enlarged sectional view showing a conventional intermediate transfer belt cleaning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Color image reading apparatus (scanner part) 2 Color image forming part (image forming part) 3 Paper supply bank 4 Document 51 Intermediate transfer belt 52 Entrance seal 53 Belt cleaning unit member 54 Lever 55 Bracket 56 Rotating fulcrum 57 Spring 200 Photosensitive Body drum 400 Revolver developing unit 500 Intermediate transfer unit 550 Backing member 551 Roller 560 Cam 561 Roller 600 Secondary transfer unit 700 Fixing unit

Claims (2)

[Claims] An image forming section for exposing a document image on a photosensitive member uniformly charged by a charger to form an electrostatic latent image, and then visualizing the electrostatic latent image by a developing device; The image forming unit transfers the toner images of the respective color components formed on the photoconductor in several divisions onto the intermediate transfer body that is sequentially driven by rotation, and transfers the toner images onto the intermediate transfer body. A color image formed on the intermediate transfer body is collectively transferred onto an intermediate transfer body for forming a color image and a recording paper conveyed in synchronization with the operation of the image forming unit or the intermediate transfer body. And an intermediate transfer body cleaning unit that removes transfer residual toner remaining on the intermediate transfer body after color image transfer, wherein the intermediate transfer body cleaning unit includes the intermediate transfer body cleaning unit. Cleani that can contact and separate from the body surface An image forming apparatus comprising: a cleaning blade; and an entrance seal member, wherein a position at which the entrance seal member abuts on the intermediate transfer body is determined by a position of a belt backing member provided on the intermediate transfer body. 2. An image forming section for exposing a document image on a photoreceptor uniformly charged by a charger to form an electrostatic latent image and then visualizing the electrostatic latent image by a developing device. The image forming unit transfers the toner images of the respective color components formed on the photoconductor in several divisions onto the intermediate transfer body that is sequentially driven by rotation, and transfers the toner images onto the intermediate transfer body. A color image formed on the intermediate transfer body is collectively transferred onto an intermediate transfer body for forming a color image and a recording paper conveyed in synchronization with the operation of the image forming unit or the intermediate transfer body. And an intermediate transfer body cleaning unit that removes transfer residual toner remaining on the intermediate transfer body after color image transfer, wherein the intermediate transfer body cleaning unit includes the intermediate transfer body cleaning unit. Cleani that can contact and separate from the body surface A contacting / separating mechanism and a positioning member for the entrance seal member provided on the intermediate transfer body side, and a position at which the entrance seal member contacts and separates from the intermediate transfer body, and An image forming apparatus characterized in that positioning is performed on the basis of a reference.