JP2002099154A - Intermediate transfer body unit and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intermediate transfer body unit and an image forming device which minimize a driving transmission path from a device main body, make the device small-sized, and reduce the production cost. SOLUTION: This intermediate transfer body is representatively a unit which can be attached to and detached from the device main body and has an intermediate transfer body to which an image formed on an image carrier is primarily transferred and a secondary transfer means contacting/leaving means which makes a secondary transfer means for transferring the image on the intermediate transfer body to a sheet contact and leave the intermediate transfer body or a cleaning contacting/leaving means which makes a cleaning means for cleaning the intermediate transfer body contact and leave the intermediate transfer body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an intermediate transfer unit in an image forming apparatus such as a copying machine or a printer using an electrophotographic system.

[0002]

2. Description of the Related Art An image forming apparatus using an electrophotographic system forms an image by visualizing a latent image with toner as a developer, transferring the latent image to a sheet, and fixing the image. In such an electrophotographic image forming apparatus, a configuration is generally known in which, in order to form a color image in particular, a toner image of a plurality of colors is primary-transferred onto an intermediate transfer member in a superimposed manner, and then is collectively secondary-transferred onto a sheet. ing.

A conventional color image forming apparatus using an intermediate transfer member is, for example, as shown in FIG.
And the intermediate transfer unit 101 have independent cartridge configurations. A large movable frame 102 is provided on the front side (left side in the drawing) of the apparatus, and the image carrier unit 100 and the intermediate transfer unit 101 are detachably mounted by rotating and opening the movable frame 102.

The image carrier unit 100 is provided above the intermediate transfer unit 101, and integrally has a photosensitive drum 103 and a waste toner storage box. The waste toner on the photosensitive drum 103 is scraped off by the cleaning blade 104 and stored in a waste toner storage box 105 on the rear surface.

Further, waste toner on the intermediate transfer belt 106 of the intermediate transfer unit 101 is also scraped off by a cleaning blade (not shown), transported to a lower portion of the first transport pipe by a transport coil, and further transported in the first transport pipe. Is transported to a position above the waste toner storage box 105. Thereafter, the sheet is conveyed by the conveyance coil in the second conveyance pipe, and is finally stored in the waste toner storage box 105.
The connecting portion between the second transport pipe and the waste toner box is a separate unit and is configured to be detachably attached to each other, so that waste toner is not spilled at the time of attachment and detachment.

In the above configuration, the image carrier unit 10
0 and the intermediate transfer unit 101 are independently positioned in the image forming apparatus main body, and the drive transmission couplings of the photosensitive drum 103 and the intermediate transfer belt 106 are also independently connected to the coupling on the image forming apparatus main body side. It is configured to be.

Here, the cleaning blade itself for scraping waste toner on the intermediate transfer belt 106 is provided in the intermediate transfer body unit 101, but a driving means for bringing the cleaning blade into contact with and separating from the intermediate transfer belt 106 is provided in the apparatus main body. Is provided. Further, a driving unit for moving the secondary transfer unit 107 for transferring the toner image on the intermediate transfer belt 106 onto the sheet at a time to the surface of the intermediate transfer belt 106 is provided on the apparatus main body side.

FIG. 11 shows a conventional cam drive transmission means. As shown in the figure, an ICL contact / separation cam 108 for bringing the cleaning blade into and out of contact is attached to an ICL contact / separation cam shaft 109.
a and the left side plate 100b. And I
By rotating the CL contact / separation cam shaft 109 by a predetermined angle,
An ICL contact / separation cam 108 biases the cleaning blade to contact / separate from the intermediate transfer belt 106.

Similarly, a secondary transfer means 10 is provided in the apparatus main body.
A secondary transfer device contact / separation cam 110 for bringing the 7 into and out of the intermediate transfer belt 106 and a secondary transfer device contact / separation cam shaft 11 for rotating the cam 110
1. The DB contact / separation cam 112 and the DB contact / separation cam shaft 113 for moving the photosensitive drum 103 and the intermediate transfer belt 106 toward and away from each other
0a to the left side plate 100b.

[0010]

However, in the configuration according to the above-mentioned conventional example, the cleaning blade for scraping waste toner on the intermediate transfer belt 106 and the secondary transfer means 10
A cam drive transmitting means for bringing the 7 into and out of contact with the surface of the intermediate transfer belt is provided on the apparatus main body side, and the rotational driving force is also transmitted from a driving source in the apparatus main body via the gear train 114, so that the apparatus main body is The drive transmission path inside is complicated.

The mechanism for bringing the cleaning blade and the secondary transfer means 107 into and out of contact with the intermediate transfer belt 106 uses a lever and cams 108, 110, and 112, respectively, and a through shaft 109, 111, 113 extending across the width of the apparatus main body. This necessitates a large space in the apparatus body, and also complicates the configuration. For this reason, there has been a problem that the unit is enlarged, the apparatus body is complicated and enlarged, and the production cost is increased.

Further, in the configuration in which the image carrier unit 100 and the intermediate transfer unit 101 are provided separately, there is a problem that the entire apparatus becomes large. In addition, the opening for attaching and detaching the unit becomes large and complicated, which leads to an increase in cost. Further, the presence of the two types of process cartridges may cause a predetermined attaching / detaching procedure, and the operability for the user may be reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an intermediate transfer unit and an image forming apparatus in which the drive transmission path from the apparatus main body is minimized to reduce the size and production cost of the apparatus. .

[0014]

In order to solve the above-mentioned problems, a typical structure of an intermediate transfer unit according to the present invention is a unit detachable from an apparatus main body, and is provided on an image carrier. An intermediate transfer body on which the formed image is primarily transferred, and a secondary transfer means contacting / separating means for bringing a secondary transfer means for transferring the image on the intermediate transfer body onto a sheet to / from the intermediate transfer body, or A cleaning unit for cleaning the intermediate transfer member, and a cleaning contacting / separating unit for moving the intermediate transfer member toward and away from the intermediate transfer member.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an intermediate transfer body unit and an image forming apparatus according to the present invention will be described with reference to the drawings. In the present embodiment, the image forming apparatus is a four-color full-color laser beam printer employing an electrophotographic method.

(Image Forming Apparatus) FIG. 1 is a longitudinal sectional view for explaining a schematic configuration of the image forming apparatus. The image forming apparatus A has a process cartridge B detachably as an intermediate transfer body unit having an intermediate transfer body and a secondary transfer unit contact / separation unit or a cleaning contact / separation unit. The process cartridge B will be described later.

When an image is formed, the surface is uniformly charged by a charging roller 2 as a charging unit while rotating a photosensitive drum 1 as an image carrier in the direction of an arrow (counterclockwise) in FIG. An electrostatic latent image is formed by performing light irradiation. At the same time as the formation of the electrostatic latent image, the developing device 4 is driven to place the yellow developing unit 4Y at the developing position, and the electrostatic latent image on the photosensitive drum 1 is developed with yellow toner. A voltage having the same polarity and substantially the same potential as the charging polarity of the photosensitive drum 1 is applied to the toner, so that the yellow toner adheres to the electrostatic latent image.

The toner image formed on the photosensitive drum 1 is transferred to an intermediate transfer belt 5 which is an intermediate transfer member rotating in synchronization with the photosensitive drum 1 by a primary transfer roller 6 as a primary transfer means. . A voltage having a polarity opposite to that of the toner is applied to the primary transfer roller 6, and the toner image on the photosensitive drum 1 is attracted. When the yellow toner image is primary-transferred, the developing device 4 rotates, similarly forming, developing, and primary-transferring the electrostatic latent image sequentially for each of the colors magenta, cyan, and black. Are superimposed.

At this time, a secondary transfer roller 7, which will be described later,
It is not in contact with the intermediate transfer belt 5. The charging roller 8 as a cleaning unit for the intermediate transfer belt 5 also
It is located in a non-contact state with the intermediate transfer belt 5.

On the other hand, sheets are loaded on the lower part of the apparatus main body A,
A feeding cassette 10 for feeding is arranged, and a feeding roller is provided.
The sheet is fed to the pair of registration rollers 13 by 11. A pre-registration sensor that detects a sheet upstream of the pair of registration rollers 13
12 is provided, and detects the leading edge of the sheet to cut off the rotational driving force of the pair of registration rollers 13 and cause the sheet S to wait at a predetermined position.

After the four color toner images are formed on the intermediate transfer belt 5, the secondary transfer roller 7 is pressed against the intermediate transfer belt 5 (the state shown in FIG. 1). Further, in synchronization with the rotation of the intermediate transfer belt 5, the conveyance of the sheet waiting at a predetermined position near the registration roller pair 13 as the sheet conveyance means is started, and the nip between the intermediate transfer belt 5 and the secondary transfer roller 7 is started. Sent to the department. A voltage having a polarity opposite to that of the toner is applied to the secondary transfer roller 7, and the toner image on the intermediate transfer belt 5 is secondarily transferred collectively to the surface of the conveyed sheet.

The sheet on which the toner image has been secondarily transferred reaches the fixing means 15 via the conveyor belt unit 14, where heat and pressure are applied to fix the toner image. Then, the sheet is conveyed along a discharge guide 17 by a fixing discharge roller 16, discharged and stacked on a discharge tray 19 provided on the upper surface of the apparatus by a discharge roller pair 18, and the image formation is completed.

On the other hand, a charging roller 8 as a cleaning means is pressed against the intermediate transfer belt 5 after the completion of the secondary transfer, and the remaining toner remaining on the intermediate transfer belt 5 is given a charge opposite to that at the time of transfer. The residual toner on the intermediate transfer belt 5 is electrostatically attached to the photosensitive drum 1. A cleaning blade 9 is brought into contact with the photosensitive drum 1 as cleaning means, and the residual toner scraped off from the surface is recovered and accumulated in a waste toner storage box 20 by following a waste toner conveying means described later.

(Intermediate Transfer Unit) Next, the process cartridge B as an intermediate transfer unit will be described. 2 and 3 are side views as viewed from the left side of the front surface of the intermediate transfer body unit, FIGS. 4 and 5 are side views as viewed from the right side of the front side of the intermediate transfer body unit, and FIG. 6 is an intermediate transfer body. FIG. 7 is a view for explaining the operation of the waste toner conveying means, FIG. 8 is a view showing a state in which the secondary transfer means and the cleaning means are in contact with the intermediate transfer member, and FIG. 9 is a view showing the cam drive transmitting means. FIG.

As shown in FIG. 2, in the process cartridge B, an image carrier 21 having the photosensitive drum 1 is disposed above the projection of the intermediate transfer member 22 including the intermediate transfer belt 5.
A waste toner storage box 20 is disposed below the projection of the intermediate transfer member 22.

In the image carrier 21, the photosensitive drum 1 is rotatably supported at both ends by a right bearing 1 a and a left rotating shaft 1 b, and via a drive transmission coupling 58 which is a drive bearing at the right end. Thus, a predetermined rotational driving force is transmitted from the apparatus main body (see FIG. 6). Also,
The image carrier 21 is also provided with a drum shutter 25 that opens and closes in conjunction with the operation of attaching and detaching to and from the image forming apparatus main body.

A charging roller 2 is pressed against the photosensitive drum 1 with a predetermined force by a compression spring 24 via bearings 23 at both ends, and is configured to rotate following the photosensitive drum 1. At least one of the bearings 23 is formed of a conductive member, and applies a predetermined charging bias voltage to the charging roller 2 to uniformly charge the surface of the photosensitive drum 1. Such a contact charging type charging device is disclosed in JP-A-63-149669.

In the intermediate transfer member 22, the intermediate transfer belt 5 is an endless belt, and is stretched around an intermediate transfer member frame 35 including a handgrip portion 35a by a driving roller 26 and a driven roller 27. The driven roller 27 is given a predetermined tension by a compression spring 29 provided on bearings 28 at both ends. The drive roller 26 is rotatably supported at both ends by a right bearing 26a and a left bearing 26b, and a predetermined rotational driving force is transmitted from the apparatus body via a drive transmission coupling 59 which is a drive bearing at the right end. It has become so.

The photosensitive drum 1 with the intermediate transfer belt 5 interposed
A primary transfer roller 6 is provided at a position opposed to the intermediate transfer belt 5, and is pressed against a predetermined force by a compression spring 31 via bearings 30 at both ends, and is configured to rotate following the intermediate transfer belt 5. At least one of the bearings 30 is formed of a conductive member. By applying a predetermined charging bias voltage to the primary transfer roller 6, the toner image on the surface of the photosensitive drum 1 is primarily transferred onto the intermediate transfer belt 5.

The driving roller 26 of the intermediate transfer member 22 is provided with a cleaning charging roller 32 which is a cleaning means (hereinafter referred to as ICL), and has an integral structure.
Charging roller 8 arranged in cleaning charging roller section 32
Is pressed against the intermediate transfer belt 5 with a predetermined force by a compression spring 34 via bearings 33 at both ends, and is configured to be driven to rotate. At least one of the bearings 33 is formed of a conductive member, and applies a voltage opposite to that at the time of transfer to the charging roller 8,
A charge opposite to that at the time of transfer is applied to the residual toner on the intermediate transfer belt 5. As a result, the waste toner on the intermediate transfer belt 5 is electrostatically adsorbed and collected on the surface of the photosensitive drum 1.

A cleaning blade 9 serving as a cleaning means is provided at a predetermined position on the photosensitive drum 1, and the residual toner on the photosensitive drum 1 and the intermediate transfer belt 5 adsorbed and collected on the photosensitive drum 1 described above. The remaining toner is scraped off. The scraped waste toner is prevented from falling onto the intermediate transfer belt 5 by the squeeze sheet 36, and falls into the image carrier frame 37. The waste toner accumulated at the bottom of the image carrier frame 37 is conveyed to the right as viewed from the front of the apparatus by the rotation of the screw 38 (FIG. 6).
In the direction of arrow C).

As shown in FIG. 4, the waste toner is conveyed by the screw 38 to the right side as viewed from the front of the apparatus of the process cartridge B, and slides down the waste toner passage 39 (the direction of arrow D in FIG. 4). Further, a wire 40 having a U-shape is provided inside the waste toner passage 39 as shown in FIG. 6, and one end thereof is rotated to a position eccentric from the rotation center of the screw 38 as shown in the figure. The other end is free and the waste toner passage 39 and waste toner storage box 20 are freely inserted.
It is inserted in the hole 41 connecting the.

When the screw 38 rotates in the direction of arrow C, the wire 40 traces the inner wall surface of the waste toner passage 39 while swinging as shown in FIGS. 7 (a) to 7 (d). At this time, the U-shape of the wire 40 moves back and forth in the waste toner conveying direction, so that the clogging of the waste toner is prevented and the effect of conveying the waste toner is obtained. Further, a waste toner passage 39 and a waste toner storage box
At the hole 41 connecting the 20, the end of the wire 40 is shown in FIGS.
Since the outer periphery of the hole 41 is rotated as shown in FIG. 7, the clogging of waste toner in the hole 41 can also be prevented.

The waste toner dropped from the hole 41 into the waste toner storage box 20 is adjusted by the stirring plate 42 and accumulated. The stirring plate 42 is rotated by transmitting a rotational driving force from the image forming apparatus main body, similarly to the screw 38.

(Contact / Separation Means) Here, the contact / separation means of the secondary transfer means and the cleaning means (ICL) which are features of the present invention will be described. As shown in FIG. 6, at both ends of the drive roller 26 of the intermediate transfer belt 5, ICL contact / separation cams 45a are provided.
45b and secondary transfer roller contact / separation cams 46a and 46b are provided respectively. Further, cam drive gears 47a and 47b are disposed between the ICL contact / separation cam 45 and the secondary transfer roller contact / separation cam 46, respectively. The ICL contact / separation cam 45 and the secondary transfer roller contact / separation cam 46 are cam drive gears. 47 is fixed with a predetermined phase.

The ICL contact / separation cam 45, the secondary transfer roller contact / separation cam 46, and the cam drive gear 47 are integrated into a drive roller.
It is provided rotatable with respect to 26. In addition, the cam phases at the left and right ends are matched to the target, and the left and right cam drive gears 47
Drive transmission gears 49a and 49b, which are cam drive transmission means provided at both ends of the through shaft 48, mesh with the a and 47b, respectively, so that the cams at the left and right ends rotate synchronously.
As shown in FIG. 5, the rotational drive force transmitted from the apparatus main body is transmitted from the gear 50 to the idler gear by the right drive transmission gear 49a.
It is transmitted via 51 and 52. Thereby, the cam drive gear 47 is moved from the drive transmission gears 49a and 49b provided at the left and right ends.
The driving force is transmitted to each of the ICL contact / separation cams 45a and 47b.
a, 45b and the secondary transfer roller contact / separation cams 46a, 46b rotate.

Here, the charging roller 8 for cleaning is used.
Is rotatably held by the left and right bearings 33 as described above, and is driven by the left and right compression springs 34 on the drive roller 26 of the intermediate transfer belt 5 along the bearing slide portion 35b (see FIG. 4) of the intermediate transfer body frame 35. Being energized. In the state shown in FIGS. 3 and 4, the tips 33a of the left and right bearings 33 are ICL contact / separation cams.
The cleaning charging roller 8 is in contact with 45 a and 45 b and is separated from the surface of the intermediate transfer belt 5.

Further, a secondary transfer roller 7 provided on the apparatus main body side is also rotatably held by left and right bearings 54, and is moved by a compression spring 55 along a bearing slide guide portion 57 of the apparatus main body frame 56. No. 5 drive roller 26. In the state shown in FIGS. 3 and 4, the distal ends 54 a of the left and right bearings 54 are in contact with the secondary transfer roller contact / separation cam 46 and are separated from the surface of the intermediate transfer belt 5. Here, a protrusion 57a for preventing the bearing 54 from coming off is provided at the end of the bearing slide guide 57 on the side of the apparatus body frame 56, so that the secondary transfer roller 7 does not come off even if the process cartridge B is pulled out from the apparatus body. It has become.

In the above configuration, the cleaning contact / separation means includes an ICL contact / separation cam 45, a drive transmission gear 49, and a compression spring.
34, and a bearing 33. Similarly, the secondary transfer unit contact / separation unit includes a secondary transfer roller contact / separation cam 46, a drive transmission gear 49, a compression spring 55, and a bearing 54.

The state in which the charging roller 8 and the secondary transfer roller 7 are separated from the intermediate transfer belt 5 is a state in which a toner image is formed on the intermediate transfer belt 5 or the image forming apparatus itself is at rest. State. Further, the ICL contact / separation cam 45 and the secondary transfer roller contact / separation cam 46 are also used when the process cartridge B is removed from the apparatus main body and when the process cartridge B is mounted on the apparatus main body. The transfer roller 7 is positioned at a phase that keeps the transfer roller 7 separated.

When a toner image is formed on the intermediate transfer belt 5 and the toner image is secondary-transferred to the sheet, the driving force is transmitted to the gear 50 so that the driving transmission gear 49 is driven to rotate. Thus, the ICL contact / separation cam 45 and the secondary transfer roller contact / separation cam 46 are integrally rotated by 180 °. As a result, the ICL contact / separation cam 45 has a smaller phase with respect to the bearing tip 33a of the charging roller 8, and the charging roller 8
The intermediate transfer belt 5 is urged by the urging force 34. Similarly, the secondary transfer roller contact / separation cam 46 has a smaller phase with respect to the bearing end 54 a of the secondary transfer roller 7, so that the secondary transfer roller 7 is biased by the compression spring 55 so that the intermediate transfer belt Energized to 5.

As described above, the bearing of the secondary transfer roller 7 or the charging roller 8 is urged and brought into contact with the cam provided coaxially with the driving roller, and the cam is rotated to rotate the secondary transfer roller 7 or the charging roller 8. With the configuration in which the contact and separation are performed, the contact and separation unit can be provided in the intermediate transfer body unit with a very simple configuration, and the drive transmission path can be minimized.

(Cam Drive Transmitting Means) Next, the structure of the cam drive transmitting means for transmitting the drive from the image forming apparatus main body to the cam drive transmitting means will be described. In FIG.
Gear 50 directly connected to the coupling and cam drive gears 47a, 47
The gear ratio of b is 1: 2, and the cam rotates half a turn for one rotation of the coupling.

As shown in FIG. 9A, one of the D cut portions at both ends of the cam drive shaft 60 is inserted into the gear 50, and the D cut portion at the other end is inserted into the coupling 61. The coupling 61 is provided with two holes 61a, and a groove 61b is formed on the outer periphery. A slide ring 62 for inserting the cam drive shaft 60 is provided between the coupling 61 and the gear 50, and is urged toward the coupling 61 by a compression spring 63. At this time, the two claw portions 62a of the slide ring 62 are inserted into the holes 61a of the coupling 61.
Further, a protrusion 62b, which is a locking means provided on the outer peripheral portion of the slide ring 62, penetrates a groove 61b provided on the outer peripheral portion of the coupling 61 and fits into a groove 43a provided on the right side cover 43. I agree.

When connecting the drives, as shown in FIG. 9B, the drive coupling 64 slides out of the image forming apparatus main body and protrudes. Then, the claw portion 64a of the drive coupling 64 is moved to the coupling 61 on the process cartridge B side.
Is inserted into the hole 61a, and the claw 62a of the slide ring 62 pushes the entire slide ring 62 against the compression spring 63.

At this time, the protrusion 62b provided on the outer peripheral portion of the slide ring 62 is disengaged from the groove 43a of the right side cover 43, and the lock is released. When the drive coupling 64 of the image forming apparatus main body rotates in this state, the rotational drive force is transmitted through the claw portion 64a of the drive coupling 64 and the hole 61a of the coupling 61, and further, the gear 50, the idler gears 51, 52 The rotational driving force is transmitted to the ICL contact / separation cam 45 and the secondary transfer roller contact / separation cam 46 via the.

The drive coupling 64 on the image forming apparatus main body side
Is controlled by one rotation, and is configured to stop at the same phase. Since the gear ratio between the gear 50 and the cam drive gears 47a and 47b is 1: 2, the ICL contact / separation cam 45 and the secondary transfer roller contact / separation cam 46 rotate by 180 ° for each rotation of the drive coupling 64. . These cam states can be determined by looking at the current values of the intermediate transfer belt 5, the secondary transfer roller 7, and the charging roller 8.

[0048]

As described above, in the intermediate transfer body unit and the image forming apparatus according to the present invention, the intermediate transfer body having the intermediate transfer body and the secondary transfer means contacting / separating means, or the cleaning contacting / separating means. With the configuration as a unit, the drive transmission path in the image forming apparatus main body can be minimized.

The contact / separation means includes a cam supported on the same axis as a roller for stretching the intermediate transfer member, a cam drive transmission means for transmitting drive to the cam, and a secondary transfer means or cleaning means. The contact / separation means is provided in the intermediate transfer body unit with a very simple structure by comprising the urging means for urging the roller and the bearing which supports the secondary transfer means or the cleaning means and abuts on the cam. The drive transmission path can be minimized even in the intermediate transfer unit.

Thus, the intermediate transfer unit is small,
Further, since the image forming apparatus can be configured with a small number of drive transmission paths, the size of the entire image forming apparatus can be reduced, and the cost of the apparatus can be reduced.

Further, since the image carrier and the intermediate transfer member are formed as an integrated unit, the apparatus is as small and inexpensive as the conventional black-and-white developing means and the image carrier-integrated process cartridge. It can be.
In addition, since the opening for attaching and detaching the unit can be made small and simple, the cost of the apparatus can be further reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a schematic configuration of an image forming apparatus.

FIG. 2 is a side view of the front surface of the intermediate transfer unit viewed from the left side.

FIG. 3 is a side view of the front surface of the intermediate transfer unit viewed from the left side.

FIG. 4 is a side view seen from the right side with respect to the front surface of the intermediate transfer body unit.

FIG. 5 is a side view of the front surface of the intermediate transfer body unit as viewed from the right side.

FIG. 6 is a top view of the intermediate transfer unit.

FIG. 7 is a diagram illustrating the operation of a waste toner conveying unit.

FIG. 8 is a diagram illustrating a state in which a secondary transfer unit and a cleaning unit are in contact with an intermediate transfer member.

FIG. 9 is a diagram illustrating cam drive transmission means.

FIG. 10 is a diagram illustrating a conventional image forming apparatus.

FIG. 11 is a diagram illustrating a conventional cam drive transmission unit.

[Explanation of symbols]

 A: Image forming apparatus B: Process cartridge S: Sheet 1: Photoreceptor drum 1a: Right bearing 1b: Left rotating shaft 2: Charging roller 3: Exposure means 4: Developing device 5: Intermediate transfer belt 6: Primary transfer roller 7 ... Secondary transfer roller 8… Charging roller 9… Cleaning blade 10… Supply cassette 11… Supply roller 12… Pre-registration sensor 13… Registration roller pair 14… Transport belt unit 15… Fixing means 16… Fixing discharge roller 17… Discharge guide 18 ... discharge roller pair 19 ... discharge tray 20 ... waste toner storage box 21 ... image carrier 22 ... intermediate transfer member 23 ... bearing 24 ... compression spring 25 ... drum shutter 26 ... drive roller 26a ... right side bearing 26b ... left side bearing 27 ... driven roller 28 ... bearing 29 ... compression spring 30 ... bearing 31 ... compression spring 32 ... cleaning charging roller part 33 ... bearing 33a ... tip 34 ... pressure Compression spring 35… Intermediate transfer body frame 35a… Handshake part 35b… Bearing slide part 36… Squeeze sheet 37… Image carrier frame 38… Screw 39… Waste toner passage 40… Wire 41… Hole 42… Stirring plate 43… Right side cover 43a … Groove part 44… Left side cover 45… ICL contact / separation cam 46… Secondary transfer roller contact / separation cam 47… Cam drive gear 48… Thru shaft 49… Drive transmission gear 50… Gear 51… Idler gear 52… Idler gear 53… Bearing 54… Bearing 54a ... Tip 55 ... Compression spring 56 ... Device body frame 57 ... Bearing slide guide 57a ... Projection 58 ... Drive transmission coupling 59 ... Drive transmission coupling 60 ... Cam drive shaft 61 ... Coupling 61a ... Hole 61b ... Groove 62… Slide ring 62a… Claw 62b… Protrusion 63… Compression spring 64… Drive coupling 64a… Claw

Claims (9)

[Claims] 1. An image forming apparatus, comprising: an intermediate transfer member for temporarily transferring an image formed on an image carrier; and an image transfer device for transferring an image on the intermediate transfer member to a sheet. An intermediate transfer body unit, comprising: a secondary transfer means contact / separation means for bringing the next transfer means into and out of contact with the intermediate transfer body. 2. An intermediate transfer body, which is detachably mountable to an apparatus main body, and includes an intermediate transfer body for temporarily transferring an image formed on an image carrier, and a cleaning unit for cleaning the intermediate transfer body. And a cleaning contacting / separating means for contacting / separating the transfer member. 3. The secondary transfer means contacting / separating means or cleaning contacting / separating means includes: a cam rotatably supported on the same axis as a roller for stretching the intermediate transfer member; and a cam drive for transmitting drive to the cam. A transmission unit; an urging unit that urges the secondary transfer unit or the cleaning unit to the roller; and a bearing that axially supports the secondary transfer unit or the cleaning unit and abuts on the cam. The intermediate transfer unit according to claim 1, wherein: 4. The secondary transfer means contacting / separating means maintains a state where the intermediate transfer body and the secondary transfer means are separated when the intermediate transfer body unit is mounted on an apparatus main body. The intermediate transfer unit according to claim 1, wherein 5. The cleaning contacting / separating means, in a state where the intermediate transfer body unit is detached from the apparatus main body, maintains a state in which the intermediate transfer body and the cleaning means are separated from each other. Item 3. The intermediate transfer unit according to Item 2. 6. The intermediate transfer body unit includes the cleaning unit, and the cleaning unit applies a charge opposite to that at the time of transfer to the waste toner remaining on the surface of the intermediate transfer body, thereby providing the waste toner. 3. The intermediate transfer unit according to claim 2, wherein the image carrier is collected by the image carrier. 7. The image forming apparatus according to claim 1, wherein the intermediate transfer body unit integrally includes an image carrier for carrying a latent image and a waste toner container for containing collected waste toner. The intermediate transfer unit according to the above. 8. The intermediate transfer body unit includes a driving force transmitting unit that transmits a driving force from the apparatus main body to the secondary transfer unit contacting / separating unit or the cleaning contacting / separating unit. 3. The intermediate transfer body unit according to claim 1, further comprising a lock unit that can transmit a driving force only when the intermediate transfer body unit is mounted on the apparatus main body. 9. An image forming apparatus comprising: a sheet conveying means for conveying a sheet; and the intermediate transfer body unit according to claim 1.