JP3483100B2 - Image forming device - Google Patents

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 for obtaining a desired print by using an endless belt.

[0002]

2. Description of the Related Art For example, in an image forming apparatus adopting an electrophotographic system, a surface of a photosensitive member is uniformly charged by a charging device and then exposed by a light corresponding to an image to be outputted by an exposing device. Thereby, an electrostatic latent image is formed on the surface of the photoconductor. This electrostatic latent image is developed with toner in the developing device, and a toner image is formed on the surface of the photoconductor. This toner image is transferred onto the paper by the transfer device.

There are various types of transfer devices, and one of them uses a bias application type transfer roll called BTR. The bias application type transfer roll is pressed against the surface of the photoconductor while sandwiching the paper, and the toner image on the surface of the photoconductor is transferred to the paper by voltage and pressure.

Further, in order to prevent the bias applying type transfer roll from being contaminated with the toner, the bias applying type transfer roll is provided so as to be capable of being brought into contact with and separated from the photoconductor, and the bias applying type transfer roll is provided in a period in which the paper does not pass. A structure in which the roll is separated from and in contact with the surface of the photoconductor is disclosed in Japanese Patent Laid-Open No. 5-3135.
No. 25, JP-A-6-317994 and the like.

[0005]

However, in the transfer device of the type in which the transfer to the paper is performed by using the bias application type transfer roll and applying at least the pressure,
Since the bias application type transfer roll lifts the photoconductor,
There is a drawback in that the positional relationship between the photoconductor and the exposure point changes, which adversely affects image formation.

Further, the bias applying type transfer roll is pushed down by the same force as a reaction force, but since the mounting rigidity of the bias applying type transfer roll supporting member is different between the back side and the front side of the image forming apparatus, pressure is not applied. It had the drawback of producing uniformity. In order to prevent this non-uniform pressure, it is necessary to increase the mounting rigidity of the bias application type transfer roll supporting portion village, and there is also a drawback that the cost increases.

A similar problem also occurs in an image forming apparatus of a type in which a bias application type transfer roll is pressed against an intermediate transfer member.

FIG. 13 is a schematic sectional view showing a separation / contact structure of a transfer roll in a conventional image forming apparatus using an intermediate transfer member. A belt-shaped intermediate transfer member 52 is provided in contact with the surface of the drum-shaped photosensitive member 51. The intermediate transfer body 52 includes intermediate transfer body supporting frames 53, 5
It is wound around support rolls 55 and 56 that are rotatably attached to the roller 4. Further, the bias application type transfer roll 57 is detachably contactable with the surface of the intermediate transfer body 52.
Is provided. This bias application type transfer roll 57
Are rotatably supported by movable frames 59 and 60 attached to the transfer roll support frame 58 so as to be vertically movable. In addition, the transfer roll support frame 58
Is fixed to the rear frame 61 of the apparatus main body, and the intermediate transfer member support frame 53 is detachably attached to the rear frame 61.

In the image forming apparatus shown in FIG. 13, in the case of the primary transfer in which the toner image on the photoconductor 51 is transferred to the intermediate transfer body 52, as shown in FIG. A toner image is formed on the surface of the intermediate transfer body 52 in a state in which 57 is separated from the surface of the intermediate transfer body 52. Next, when the toner image on the intermediate transfer body 52 is transferred to a sheet, the bias application type transfer roll 57 is pressed against the surface of the intermediate transfer body 52 as shown in FIG. The sheet is conveyed while being sandwiched between the sheet 52 and the bias application type transfer roll 57, and the toner image on the intermediate transfer body 52 is transferred to the sheet.

At this time, since the mounting rigidity of the transfer roll support frame 58 is different between the back side and the front side of the image forming apparatus, the pressure becomes non-uniform, and the photoconductor 1 and the intermediate transfer body 52.
There arises a problem that the contact pressure between the sheet and the intermediate transfer body 52 and the contact pressure between the bias application type transfer roll 57 are not uniform in the width direction.

The above-mentioned non-uniformity of pressure has been a problem because the bias applying type transfer roll 57 is attached to the main body of the image forming apparatus and the intermediate transfer body 2 is attached to the image forming apparatus as a separate structure.

Particularly, in the image forming apparatus using the intermediate transfer member, in addition to the adverse effect on the secondary transfer from the intermediate transfer member 52 to the sheet, the primary transfer from the photosensitive member 51 to the intermediate transfer member 52 is also adversely affected. Therefore, the image quality is greatly affected.

In order to solve such a problem, it is conceivable to integrate the unit to which the bias application type transfer roll is attached and the unit to which the intermediate transfer member is attached. In the structure in which the unit and the intermediate transfer body unit are integrated, there are problems that maintainability such as replacement of the intermediate transfer body belt and replacement of the bias application type transfer roll is deteriorated, and it is difficult to remove jammed paper.

Therefore, the present invention has an object to prevent the transfer conditions from being deteriorated by the pressure from the transfer roll in the image forming apparatus of the type in which the bias applying type transfer roll is pressed against the photosensitive member or the intermediate transfer member. To do.

[0015]

SUMMARY OF THE INVENTION An image forming apparatus according to the present invention includes at least a housing that supports a first rotating member that directly affects the formation of an image, and a direct or relative to the first rotating member. In an image forming apparatus including a housing that supports a second rotating member that is pressed against a predetermined member,
The housing supporting the second rotating member is pin-connected to the housing supporting the first rotating member by being pushed into the image forming apparatus in the axial direction of the first rotating member during image formation.
And a sheet supporting a housing supporting the second rotating member
While being integrated with a solid <br/> constant lifted from the state engaged with the frame of the transport unit, at the time of non-image formation is drawn in the axial direction of the first rotary member from within the image forming apparatus wherein The pin connection is released, and the pin is separated from the housing that supports the first rotating member, and is attached to the frame of the paper transport unit.
A case can and has been housing, said second rotary member is provided on the disjunction capable housing relative to the first rotary member even when the two housings are integrated It is characterized by

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION For example, the first rotating member is an intermediate transfer member, and the second rotating member is a bias application type transfer roll. The bias application type transfer roll unit and the intermediate transfer body unit are integrated when inside the image forming apparatus , and the bias application type transfer roll unit and the intermediate transfer body unit can be separated when extracted from the image forming apparatus. Take the configuration.

[0017]

FIG. 1 is a schematic sectional view showing the principle structure of an image forming apparatus to which the present invention is applied. Also, in FIG.
FIG. 2 is a schematic cross-sectional view showing a main part of the image forming apparatus shown in FIG. 1. A drum-shaped photoconductor 2 is arranged above the inside of a casing 1 of the image forming apparatus, and around the photoconductor 2,
A charger 3 that uniformly charges the surface of the photoconductor 2, a raster output scanner 4 that exposes the surface of the photoconductor 2 to form an electrostatic latent image, an electrometer 5 that detects the surface potential of the photoconductor 2, and a photosensitizer. Body 2
In order to remove the magnetic bead carrier adhered to the photoconductor 2, a rotary type developing device 6 provided with four developing units 6a, 6b, 6c, 6d for developing the electrostatic latent image with different color toners, respectively. Bead removing device 7, a bias application type transfer roll 9 for primarily transferring the toner image on the photoconductor 2 to the surface of the belt-shaped intermediate transfer body 8 at the primary transfer site, and the surface of the photoconductor 2 after the primary transfer is neutralized. Static eliminator 1
0, a photoconductor cleaner 11 for removing the toner remaining on the surface of the photoconductor 2 after the primary transfer, and the like are sequentially arranged.

The intermediate transfer member 8 is rotatably supported by a plurality of rolls 12a, 12b, 12c and 12d including drive rolls. At the position of the roll 12d,
A bias application type transfer roll 13 is provided in a state capable of being pressed against the intermediate transfer member 8, and a secondary transfer portion S is formed between the roll 12d and the bias application type transfer roll 13. Further, a transfer roll cleaner 14 for removing the toner attached to the bias application type transfer roll 13 is provided adjacent to the bias application type transfer roll 13. Further, on the downstream side of the secondary transfer portion S, an intermediate transfer body cleaner 15 for removing the toner remaining on the surface of the intermediate transfer body 8 in the secondary transfer is provided.

On the other hand, below the inside of the casing 1 of the image forming apparatus, a plurality of paper feed trays 16a, 16b for accommodating paper sheets,
16c is arranged, and a manual paper feed tray 17 is provided on the side surface of the housing 1 of the image forming apparatus. Paper fed from any one of these trays is fed by a paper feeding device 18 to a paper feeding unit. It is sent to 19.

In the paper transport unit 19, the paper supplied from the paper feed tray is sent to the secondary transfer portion S through the paper chute 21 by the registration roll pair 20 at a predetermined timing. At the secondary transfer portion S, the toner image on the intermediate transfer member 8 is transferred to the paper. The transferred sheet is conveyed to the fixing device 23 by the conveying belt 22, undergoes a fixing process, and is then ejected outside the apparatus.

When printing a color image in the above-mentioned image forming apparatus, first, as shown in FIG. 3, the bias applying type transfer roll 13 is separated from the intermediate transfer body 8. Next, electrostatic latent images corresponding to the colors of yellow, magenta, cyan, and black are sequentially formed on the surface of the photoconductor 2, and the electrostatic latent images corresponding to the respective colors are sequentially changed by the developing device 6 corresponding to the respective colors. Develop with color toner. Then, the toner images of the respective colors are sequentially primary-transferred in such a manner that they are superposed on the same position of the intermediate transfer body 8 for each rotation of the intermediate transfer body 8. As a result, a full-color image composed of toner images of the respective colors is formed on the intermediate transfer member 8. At this time, the bias application type transfer roll 13
Are separated from the intermediate transfer body 8, the bias application type transfer roll 13 does not adversely affect the toner image on the intermediate transfer body 8.

Next, when the full-color toner image formed on the surface of the intermediate transfer member 8 is secondarily transferred to the paper, as shown in FIG. 4, the bias application type transfer roll 13 is intermediately transferred via the paper C. The toner on the surface of the intermediate transfer body 8 is transferred to the paper C by pressure contact with the body 8 and the potential difference.

Next, the separating / contacting mechanism of the bias applying type transfer roll in the above-mentioned image forming apparatus will be described.

FIG. 5 is a schematic cross-sectional view showing the separating / contacting structure of the transfer roll in the image forming apparatus of this embodiment. Also,
FIG. 6 is a schematic perspective view showing the operating state of the bias applying type transfer roll separating / contacting mechanism during the primary transfer, and FIG. 7 is a schematic diagram showing the operating state of the bias applying type transfer roll separating / contacting mechanism during the secondary transfer. It is a perspective view.

A belt-shaped intermediate transfer member 8 is provided in contact with the surface of the drum-shaped photosensitive member 2. As shown in FIG. 2, the intermediate transfer member 8 is rotatably supported by a bias application type transfer roll 9, a plurality of rolls 12a to 12d, etc., but for simplicity of explanation,
As the support member for the intermediate transfer member 8, only the bias application type transfer roll 9 and the roll 12d are shown. The bias applying type transfer roll 9 and the roll 12d are arranged along with other rolls (not shown) on the intermediate transfer body supporting frames 24 and 25.
It is rotatably supported by. Further, a bias application type transfer roll 13 is provided on the surface of the intermediate transfer body 8 in a state where it can be brought into contact with and separated from the surface.

In FIG. 6, reference numeral 26 is a frame of the paper transport unit 19, and a transfer roll support frame 27 is arranged above the frame 26 of the paper transport unit 19. The transfer roll support frame 27 is composed of a bottom plate 27a, a rear side support plate 27b vertically raised from both ends of the bottom plate 27a, and a front side support plate 27c. The front side support plate 27c is taller than the rear side support plate 27b. Swing frames 30 and 31 are rotatably attached to the rear side support plate 27b and the front side support plate 27c about axes 28 and 29, respectively, and one arm 30a of the swing frames 30 and 31,
A bias application type transfer roll 13 is rotatably attached to the tip of 31a. Although not shown, a drive mechanism for rotating the swing frames 30, 31 is connected to the tips of the other arms 30b, 31b of the swing frames 30, 31.

Pins 32 and 33 projecting toward the front side are attached to the upper end of the rear side support plate 27b and the upper end of the front side support plate 27c, respectively. An engaging hole 34 into which the pin 32 is inserted is formed in the lower end portion of the rear side intermediate transfer body supporting frame 24, and a pin 33 is inserted into the lower end portion of the front side intermediate transfer body supporting frame 25. The engaging hole 35 is formed.

The pin 32 is fitted into the engaging hole 34, and the pin 33
Is fitted into the engagement hole 35, the intermediate transfer body unit 36 composed of the intermediate transfer body supporting frames 24 and 25, the intermediate transfer body 8 and the like, and the transfer roll supporting frame 27,
Oscillating frames 30, 31, bias applying type transfer roll 1
A transfer roll unit 37 composed of 3 and the like is integrally fixed. Reference numeral 38 denotes a rear frame, which is connected to another frame by a well-known pin and a connecting mechanism having a round hole or a long hole.

During a normal image forming operation, the transfer roll unit 37 and the intermediate transfer member unit 36 are housed in the image forming apparatus in a state of being integrated by pin connection. Then, in the case of the primary transfer in which the toner image on the photoconductor 2 is transferred to the intermediate transfer body 8, as shown in FIGS.
A toner image is formed on the surface of the intermediate transfer body 8 while being separated from the surface of the intermediate transfer body 8. Next, when the toner image on the intermediate transfer body 8 is secondarily transferred onto the sheet, as shown in FIGS. 5B and 7, the bias application type transfer roll 13 is pressed against the surface of the intermediate transfer body 8. Then, the sheet is conveyed with the sheet sandwiched between the intermediate transfer body 8 and the bias application type transfer roll 13, and the toner image on the intermediate transfer body 8 is transferred to the sheet.

When the bias application type transfer roll 13 is brought into pressure contact with the surface of the intermediate transfer member 8, the swing frames 30, 3 are used.
7 is rotated counterclockwise in FIG. 7. At this time, the swing frames 30 and 31 are swingably supported by the transfer roll support frame 27, and the transfer roll support frame 27 is The intermediate transfer body supporting frames 24, 25 of the intermediate transfer body unit 36 are provided by the pins 33, 34.
Is firmly connected to the intermediate transfer member unit 36.
Is not distorted by the transfer roll support frame 27. Thereby, the pressure contact state between the photoconductor 2 and the intermediate transfer body 8, and the intermediate transfer body 8 and the bias application type transfer roll 1
The pressure contact state with 3 is maintained uniformly.

FIG. 8 is a schematic sectional view showing a mounting state of the transfer roll unit 37. As shown in FIG. 8, the pin 26 is turned upward on the frame 26 of the paper transport unit 19.
8a and 38b are planted, and engagement holes 39a and 39b for inserting the pins 38a and 38b are formed in the bottom plate 27a of the transfer roll support frame 27.

In the present embodiment, when the transfer roll unit 37 is mounted on the frame 26 of the paper transport unit 19, the central axis of the pin 32 of the rear side support plate 27b is the intermediate position where this pin 32 is inserted. It is offset downward with respect to the central axis of the engagement hole 34 of the transfer body support frame 24.
However, the central axis of the pin 32 is located within the range of the engagement hole 34. Further, a tapered taper surface 32a is formed at the tip of the pin 32. The same applies to pins other than the pin 32.

In the state before the transfer roll unit 37 is attached to the apparatus main body, the transfer roll unit 37 is placed directly on the paper transport section 19 as shown in FIG. Next, when the transfer roll unit 37 is pushed into the apparatus main body together with the paper transport unit 19, the tip of the pin 32 first enters the engagement hole 34. Paper transport unit 1
9 and the transfer roll unit 37 are pushed further in, pin 3
The second taper surface 32a collides with the outer peripheral edge of the engaging hole 34, and the entire transfer roll unit 37 is tapered by the taper surface 32 of the pin 32.
It rises from the frame 26 of the paper transport unit 19 along the inclination of a. As a result, the pins 38a, 3 of the frame 26 are
8b and the engagement holes 39a, 39b of the bottom plate 27a are released, and the transfer roll unit 37 can move independently of the frame 26 of the paper transport unit 19. When the transfer roll unit 37 is completely pushed into the main body of the apparatus, the pin 32 is completely engaged with the engagement hole 34, and the transfer roll unit 37 is moved from the frame 26 of the paper transport unit 19 as shown in FIG. Only the distance S floats.

The transfer roll unit 37 is connected to the paper transport unit 19
At the same time, when it is pulled out from the apparatus main body, the operation is the reverse of the operation described above.

FIG. 9 is a schematic perspective view showing a state in which the transfer roll unit 37 is pulled out from the apparatus main body together with the sheet conveying section 19. The transfer roll unit 37 and the intermediate transfer body unit 36 are connected by a pin protruding in the front-rear direction of the apparatus main body. Therefore, by pulling the transfer roll unit 37 toward you, the transfer roll unit 3
The transfer roller unit 37 can be pulled out from the apparatus main body in a state where the transfer roller unit 37 is placed on the paper transport unit 19 by disconnecting the connection between the transfer roller unit 37 and the intermediate transfer member unit 36. In addition, the pins 38a and 38b of the frame 26 of the paper transport unit 19 and the engaging holes 39a and 39 of the bottom plate 27a of the transfer roll support frame 27.
Since it is positioned by engaging with b, the transfer roll unit 37 will not accidentally drop out when the transfer roll unit 37 is pulled out.

In the illustrated example, the transfer roll unit is positioned by the pin and the engaging hole. However, the present invention is not limited to this, and the transfer roll unit may be connected to the sheet conveying section by its own weight or some guide means. You may In short, any means that can be mechanically coupled may be used.

In the above embodiment, the image forming apparatus provided with the intermediate transfer member and the bias applying type transfer roll unit has been described as an example, but the present invention is not limited to this and is involved in image formation. The present invention can be applied to all image forming apparatuses having a structure in which rotating members are mechanically pressed against each other.

FIG. 10 is a schematic view showing a tandem type color image forming apparatus to which the present invention can be applied. In the example shown in FIG. 10, a plurality of image forming portions 41 a that form images in different colors along the intermediate transfer belt 40.
To 41d are arranged, and the image forming units 41a to 41d are
The photoconductors 42a to 42d and the bias application type transfer rolls 43a to 43d are provided respectively.

In each of the image forming portions 41a to 41, the toner images of the respective colors are transferred in the same position on the intermediate transfer belt 40 so that a full color image is formed. The full-color image is transferred by the transfer device 45 onto the paper fed from the paper feed roll 44. The sheet after transfer is sent to a fixing device (not shown) by the conveyor belt 46.

In the image forming apparatus shown in FIG. 10, the photoconductors 42a to 42d and the bias applying type transfer roll 43a are used.
To 43d are mechanically pressed against each other, the present invention is applied to a frame that rotatably supports the photoconductors 42a to 42d and a frame that rotatably supports the bias application type transfer rolls 43a to 43d. Due to
Photosensitive members 42a to 42d and bias application type transfer roll 43
It is possible to uniformly press contact with a to 43d.

FIG. 11 is a schematic view showing an image forming apparatus using a photosensitive intermediate transfer belt to which the present invention can be applied. In the example shown in FIG. 11, the charging roll 48 a and the platen roll 4 are arranged along the photosensitive intermediate transfer belt 47.
8b to a charging device 48, an exposure device 49, a developing device 50,
Bias application type transfer roll 51, cleaning device 52
Etc. are sequentially arranged. The intermediate transfer belt 47 is charged by the charging roll 48a and then exposed by the exposure device 49 to form an electrostatic latent image. This electrostatic latent image is developed by the developing device 50 to form a toner image. This toner image is transferred onto the paper fed from the paper feed roll 53 by the bias application type transfer roll 51.

In the image forming apparatus shown in FIG. 11, the charging roll 48a and the platen roll 48b are mechanically pressed against each other, and the bias applying type transfer roll 5 is used.
1 and the supporting rolls supporting the intermediate transfer belt 47 are mechanically pressed against each other. Therefore, by applying the present invention to a frame that rotatably supports these rolls, the respective rolls can be pressed uniformly. You can

FIG. 12 is a schematic view showing an image forming apparatus using an intermediate transfer belt to which the present invention can be applied. Figure 1
In the example shown in FIG. 2, although not shown, a charging device, an exposure device, a developing device, a cleaning device and the like for forming a toner image on the surface of the photoconductor 54 are sequentially arranged around the photoconductor 54. . An intermediate transfer belt 55 is provided in a state of being in contact with the photoconductor 54, and at this contact portion,
Bias application type transfer roll 56 constituting a primary transfer device
Is provided. Further, a bias application type transfer roll 57 is provided as a secondary transfer device in a state of being in contact with the intermediate transfer belt 55.

The toner image formed on the surface of the photoconductor 54 by the well-known electrophotographic technique is a bias application type transfer roll 56.
The toner image transferred onto the intermediate transfer belt 55 by means of the
The image is transferred onto the paper fed from No. 8 by the bias application type transfer roll 57.

In the image forming apparatus shown in FIG. 12, the photosensitive member 54 and the bias applying type transfer roll 56 are mechanically pressed against each other, and the supporting roll supporting the bias applying type transfer roll 57 and the intermediate transfer belt 55. Since and are mechanically pressed against each other, by applying the present invention to a frame that rotatably supports these rolls, it is possible to uniformly press each roll.

[0046]

When the image is formed, the rotating members that directly affect the image formation are uniformly pressed against each other, so that the density is reduced.
Therefore , it is possible to prevent deterioration of image quality such as transfer failure and image distortion.
In addition, since each rotary member can be separated during non-image formation, maintainability is excellent.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the basic configuration of an image forming apparatus to which the present invention is applied.

FIG. 2 is a schematic cross-sectional view showing a main part of the image forming apparatus shown in FIG.

FIG. 3 is an explanatory diagram showing the position of a bias application type transfer roll during primary transfer.

FIG. 4 is an explanatory diagram showing the position of a bias application type transfer roll during secondary transfer.

FIG. 5 is a schematic cross-sectional view showing a separation / contact structure of a transfer roll in the image forming apparatus of this embodiment.

FIG. 6 is a schematic perspective view showing an operating state of a separation / contact mechanism of the bias application type transfer roll at the time of primary transfer.

FIG. 7 is a schematic perspective view showing an operating state of a separation / contact mechanism of a bias application type transfer roll at the time of secondary transfer.

FIG. 8 is a schematic cross-sectional view showing a mounted state of a transfer roll unit.

FIG. 9 is a schematic perspective view that schematically shows a state in which the transfer roll unit is pulled out from the apparatus main body together with the sheet conveying unit.

FIG. 10 is a schematic view showing a tandem type color image forming apparatus to which the invention can be applied.

FIG. 11 is a schematic diagram showing an image forming apparatus using a photosensitive intermediate transfer belt to which the present invention is applicable.

FIG. 12 is a schematic diagram showing an image forming apparatus using an intermediate transfer belt to which the present invention is applicable.

FIG. 13 is a schematic cross-sectional view showing a separation / contact structure of a transfer roll in a conventional image forming apparatus using an intermediate transfer body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Photosensitive member, 3 ... Charging device, 4 ... Raster output scanner, 5 ... Electrometer, 6 ... Developing device, 7 ... Bead removing device, 8 ... Intermediate transfer member, 9 ... Bias application type transfer roll ,
10 ... Static eliminator, 11 ... Photoconductor cleaner, 12a, 12
b, 12c, 12d ... Roll, 13 ... Bias application type transfer roll, 14 ... Transfer roll cleaner, 15 ... Intermediate transfer member cleaner, 16a, 16b, 16c ... Paper feed tray, 1
Reference numeral 7 ... Manual feed tray, 18 ... Paper conveying device, 19 ... Paper conveying unit, 20 ... Registration roll pair, 21 ... Paper chute, 22 ... Conveying belt, 23 ... Fixing device, 24, 25 ... Intermediate transfer member supporting frame, 26 ... Frame, 27 ... Transfer roll support frame, 27a ... Bottom plate, 27b ... Rear support plate, 27c ... Front support plate, 28, 29 ... Shaft, 3
0, 31 ... Swing frame, 30a, 31a ... Arm, 3
0b, 31b ... Arm, 32, 33 ... Pin, 34 ... Engaging hole, 35 ... Engaging hole, 36 ... Intermediate transfer body unit, 37 ...
Transfer roll unit, 38 ... Rear frame, 38a, 3
8b ... pin, 39a, 39b ... engaging hole

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Claims (9)

(57) [Claims] 1. A housing for supporting at least a first rotating member that directly influences the formation of an image, and a second member that is pressed against the first rotating member directly or through a predetermined member. In an image forming apparatus including a housing that supports a rotating member, the housing that supports the second rotating member is pushed into the image forming apparatus in the axial direction of the first rotating member during image formation, and Pin-coupled to the housing that supports the rotating member of the second rotation member, and is lifted and fixed from the state of being engaged with the frame of the paper transport unit that supports the housing that supports the second rotating member, and is integrated with the non-image. At the time of formation, it is pulled out from the inside of the image forming apparatus in the axial direction of the first rotating member to release the pin coupling, and is separated from the housing supporting the first rotating member, and is engaged with the frame of the sheet conveying unit. Possible The second rotating member is provided in the housing such that the second rotating member can be brought into and out of contact with the first rotating member even when the two housings are integrated. Image forming apparatus. 2. The first rotating member is a roll that supports an endless belt, and the second rotating member is pressed against the first rotating member via the endless belt. The image forming apparatus according to claim 1. 3. The image forming apparatus according to claim 1, wherein the first rotating member is a photoconductor. 4. The second rotating member forms an image from the photosensitive member.
4. A transfer roll for transferring
The image forming apparatus described. 5. The first rotating member is an intermediate transfer member.
The second rotating member transfers the image from the intermediate transfer member.
The image forming apparatus according to claim 1 , wherein the image forming apparatus is a transfer roll . 6. The endless belt is a photoconductor.
The image forming apparatus according to claim 2, which is characterized in that . 7. The image forming apparatus according to claim 2, wherein the endless belt is a sheet conveying body . 8. The image forming apparatus according to claim 2, wherein the endless belt is an intermediate transfer member . 9. The two casings are mechanical members during image formation.
A contract characterized by being substantially integrated by a combination means
The image forming apparatus according to claim 1 .