JPH07168462A - Image forming device - Google Patents

Abstract

PURPOSE:To attach and detach a transfer drum in the shaft direction thereof by simple constitution and to improve the operability of assembly and maintenance. CONSTITUTION:A separation plate 60 is provided on external side plates 102 and 103 adjacently to a sequence separation cam 50. The plate 60 is linearly moved by being guided by a guide member and brought into contact with the cam 50 by being energized by a spring. When the transfer drum 3a is detached from a device main body, it is separated from a photoreception drum 4a by operating an operation lever, turning a manual separation cam 40 through a manual separation shaft 41 and turning a separation lever 30. At this time, the plate 60 is separated from the cam 50 and only a transfer unit except the cam 50 and a sequence cam shaft 51 can be detached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to an electrophotographic or electrostatic recording type image forming apparatus, and more particularly to a transfer material which forms a visible image on an image carrier and moves the visible image endlessly. The present invention relates to an image forming apparatus that obtains an image by transferring it onto a transfer material that is carried on a carrier and conveyed, and can be suitably embodied in, for example, a multicolor or single color electrophotographic copying machine or a laser beam printer.

[0002]

2. Description of the Related Art An example of a multicolor electrophotographic copying machine is shown in FIG. This multi-color electrophotographic copying machine has a drum-shaped electrophotographic photosensitive member, that is, a photosensitive drum 4a, which is rotatably supported and rotates in the direction of the arrow, as an image bearing member, at a substantially central portion thereof. Around the photosensitive drum 4a, a primary charger 4b that uniformly charges the photosensitive drum 4a, a laser beam exposure unit 10 that irradiates image information to form a latent image, a latent image is developed to form a visible image (toner image). ) And a plurality of developing devices 5 (5
Y, 5M, 5C, 5K), and a transfer material carrier 3a serving as a transfer drum that carries and conveys the transfer material 2 fed from the paper feeding device 1. The toner image formed on the photosensitive drum 4a is transferred to the transfer material 2 on the transfer drum 3a.
The residual toner on the photosensitive drum 4a is removed by the cleaner 4c, and the photosensitive drum 4a is subjected to the next image forming process.

By repeating such an image forming process, a multicolor toner image is transferred onto the transfer material 2 on the transfer drum 3a in an overlapping manner.

After that, the transfer material 2 is separated from the transfer drum 3a, and the toner image is fixed on the transfer material 2 by the fixing device 6 and sent out of the apparatus.

By the way, when the photosensitive drum cartridge 4 is detached or attached, or when the transfer material 2 is not conveyed normally and the transfer material held on the transfer drum 3a is removed by stopping the apparatus, the photosensitive drum 4a is removed. Also, in order to prevent the transfer drum 3a from being damaged, it is necessary to separate the transfer drum 3a from the photosensitive drum 4a.

In order to downsize the apparatus, the transfer drum 3
In a device in which the distance between the separation point where the transfer material 2 is separated from a and the fixing device 6 is shorter than the length of the transfer material 2, a transfer material (for example, an OHP sheet) having different transfer speed and fixing speed is used. When using, after the final transfer process is completed, the photosensitive drum 4a and the transfer drum 3a are separated from each other, the peripheral speed of the transfer drum 3a is adjusted to the fixing speed, and then the transfer drum 3a is rotated once more before the transfer material is transferred. It is necessary to separate and send it to the fixing device 6.

For this reason, conventionally, a mechanism as shown in FIG. 7 has been used as a mechanism for separating the transfer drum 3a from the photosensitive drum 4a.

In FIG. 7, the transfer drum unit 3 is located between the front and rear side plates of the apparatus main body. Side plate 100,
The separation guides 20 are provided on the respective 101, and support the shaft end portion 3s of the transfer drum 3. Separation guide 20
A compression coil spring (not shown) is mounted inside the unit to press the transfer drum 3a against the photosensitive drum 4a. Further, a separating lever 30 for separating the transfer drum 3a from the photosensitive drum 4a is provided rotatably around a shaft 31 fixed on the side plates 100 and 101, and transfer is performed by a protrusion 30d formed at an appropriate position thereof. It is in contact with the shaft end 3s of the drum.

Since the transfer drum 3a is normally pressed toward the photosensitive drum 4a by the action of a compression coil spring (not shown), the position of the separating lever 30 is determined by the position of the shaft end 3s of the transfer drum 3. .

As a means for manually separating the transfer drum 3a when the photosensitive drum cartridge 4 is attached or detached, or when the transfer material on the transfer drum 3a is removed, a manual separation cam 40 is provided near both ends of the transfer drum 3a. It is arranged and is connected by a manual separation shaft 41. Further, an operation lever 42 shown by a broken line is provided at one end of the manual separation shaft 41. Further, the manual separation shaft 41 is rotatably supported also on the front and rear side plates, and the operation lever 4
When 2 is rotated, the manual separation cam 4 is moved through the manual separation shaft 41.
0 will also rotate together. Manual separation cam 4
When 0 rotates, it contacts the separation lever 30, and when it further rotates, the transfer drum 3a is separated from the photosensitive drum 4a against the biasing force of the compression coil spring inside the separation guide 20.

Further, when the transfer speed and the fixing speed are different from each other, a sequence separation cam 50 for separating the transfer drum 3a in the image forming sequence is provided adjacent to the manual separation cam 40 and on the manual separation shaft 41. It is fixed to a sequence cam shaft 51 that extends in parallel to it. The sequence cam shaft 51 is rotatably supported by front and rear device side plates,
It is driven by half-rotation control or the like by a driving means (not shown).
When the sequence separation cam 50 rotates, the separation lever 30
The transfer drum 3a can be separated from the photosensitive drum 4a against the biasing force of the compression coil spring inside the separation guide 20.

[0012]

However, in the structure of the above-mentioned conventional example, since the sequence separation cam 50 is complicatedly connected to the driving means thereof, it is difficult to detach the transfer drum in the axial direction thereof. Met. As a result, when assembling and maintaining the transfer drum and its related members, the workability is extremely poor because the transfer drum is located inside the front and rear side plates.

Further, since the sequence separation cam 50 rotates while forming a sliding pair with the separation lever 30, the driving torque thereof is very large.

Therefore, an object of the present invention is to make it possible to detach the transfer drum in its axial direction with a simple structure, to improve the workability of assembly and maintenance, and to reduce the driving torque of the sequence separation cam. A forming device is provided.

[0015]

The above object can be achieved by an image forming apparatus according to the present invention. In summary, the present invention is
In an image forming apparatus in which a transfer material carrier can be separated from an image carrier, at least a separation guide that supports the transfer material carrier and guides the separation, and rotates to press the transfer drum shaft end portion. There is a separation means including a separation lever, a manual separation cam that presses the separation lever, a sequence separation cam that presses the separation lever, and a member that performs displacement transmission between the separation lever and the sequence separation cam. An image forming apparatus characterized by the above.

[0016] Preferably, when the transfer material carrier is pulled out from the apparatus main body in the axial direction, members for separation except the sequence spacing cam are pulled out integrally with the transfer material carrier.

Preferably, the member for transmitting the displacement between the separation lever and the sequence separation cam is a rotary roller on the linear motion member or a rotary roller on the swing member.

[0018]

Embodiments of the image forming apparatus according to the present invention will be described below in more detail with reference to the drawings. The same members as those described above are designated by the same reference numerals.

First Embodiment A first embodiment of the image forming apparatus according to the present invention will be described with reference to FIGS. 1, 2 and 5. FIG. 5 is an overall configuration diagram showing an image forming apparatus such as a color laser beam printer.

First, the overall structure of the color image forming apparatus will be schematically described with reference to FIG. As shown in FIG. 5, the color image forming apparatus of the present embodiment has an electrophotographic photosensitive drum 4a as an image carrier, and a rotary developing device for electrostatic latent images of respective colors formed on the photosensitive drum 4a by exposure. The toner images of the respective colors are formed by developing with 5A, and the toner images of the respective colors are fed from the feeding unit 1 and are multiple-transferred onto the transfer material 2 wound around the transfer drum 3a, which is the transfer material carrier. Form a color image. Transfer material 2 onto which toner images of respective colors have been transferred
Are separated from the transfer drum 3a and sent to a fixing unit 6, where the toner images are mixed to fix and fixed to the transfer material 2 to form a full-color permanent image, and then the discharge roller 7 discharges the toner from the upper portion of the apparatus. It is discharged to the part 8.

The exposure of the photosensitive drum 4a is performed by the scanner unit 1.
Performed by 0. The scanner unit 10 has a laser diode (not shown), and when an image signal is given, this laser diode generates image light λ corresponding to the image signal and irradiates it to the polygon mirror 10a. The polygon mirror 10a is rotated at a high speed by a scanner motor to reflect the image light λ, and the image light λ reflected by the polygon mirror 10a is exposed from the exposure section of the image carrier unit via the coupling lens 10b and the reflection mirror 10c. The drum 4a is selectively exposed.

Next, the configuration of each part of the image forming apparatus will be described in detail.

The feeding section 1 is for feeding the transfer material 2 to the transfer drum 3a, and has a paper feed cassette 1a for accommodating the transfer material 2 loaded at the bottom of the apparatus main body 9.
At the time of image formation, the feeding roller 1b rotates according to the image forming operation to separate the transfer materials 2 one by one from the cassette 1a and feed them to the transfer drum 3a. Transfer material 2 is guide plate 1
It is fed to the transfer drum 3a through the registration roller 1e while being guided by c.

The transferred transfer material 2 is wound around the transfer drum 3a, and the toner image of each color on the photosensitive drum 4a is transferred onto the transfer material 2a.
In order to transfer the image onto the photosensitive drum 4a, the photosensitive drum 4a is rotated at the same speed as the peripheral speed of the photosensitive drum 4a in the arrow direction of FIG. The transfer drum 3a is rotatably supported by a fixed shaft 3e, and by transmitting a driving force from a drive motor to a gear (not shown) fixed to the transfer drum 3a, the transfer drum 3a is rotated in the arrow direction according to the image forming operation. Is configured.

Further, at a predetermined position on the outer circumference of the transfer drum 3a, a gripper 3f for gripping the leading end of the fed transfer material 2 is provided. The transfer material guide member 3m guides the transfer material 2 when the tip of the transfer material 2 is gripped by the gripper 3f. Further, an electrostatic attraction roller 3g is provided so that it can be brought into contact with and separated from the outer periphery of the transfer drum 3a
Is provided, and the suction roller 3g transfers the transfer material 2 to the transfer drum 3
It is pressed against the outer periphery of the transfer drum 3a so as to be sandwiched between it and a. Then, by applying a voltage between the attraction roller 3g and the transfer drum 3, electric charges are induced in the dielectric material (not shown) of the transfer material 2 and the transfer drum 3a, which are dielectrics, and the transfer material 2 is transferred to the transfer drum 3a. Electrostatically adsorbed on the outer periphery of.

The photosensitive drum 4a, which is an image carrier, has its rotation axis rotatably supported by the image carrier cover 4e. The photosensitive drum 4a is configured to rotate in the arrow direction of FIG. 5 in accordance with an image forming operation by transmitting a driving force from a driving motor to one end of a rotation shaft thereof via a gear (not shown). A primary charger 4b and a cleaner 4c are arranged on the outer circumference of the photosensitive drum 4a.

The above-mentioned primary charger 4b is disclosed in JP-A-63-1.
The surface of the photosensitive drum 4a is formed by using a so-called contact charging method as disclosed in Japanese Patent Publication No. 49669 and equipped with a conductive roller. The conductive roller is brought into contact with the photosensitive drum 4a and a voltage is applied to the conductive roller. To be uniformly charged.

The cleaner 4c is for cleaning the toner remaining on the photosensitive drum 4a after the toner image formed on the photosensitive drum 4a by the developing device 5A is transferred to the transfer material 2 and is used in the present embodiment. In the example, cleaner 4
The waste toner cleaned by c is transported to a waste toner container (not shown) attached to the side surface of the apparatus main body by a transport screw 4d inserted into the waste toner container. When the waste toner container is full of waste toner, it is removed and replaced with a new waste toner container.

The rotary developing device 5A has developing devices 5 for the respective colors, that is, developing devices 5M, 5C, 5Y and 5K provided with magenta, cyan, yellow and black toners. The developing devices 5 of these four colors are rotatably arranged around a rotation shaft 5e, and the centers of the respective developing devices 5 rotate in conjunction with a rotating gear arranged on the outer periphery of the revolving gear, and their postures. Is always kept constant.

At the time of image formation, the developing device 5 rotates around the shaft 5e, and the developing device 5 of the color corresponding to the latent image stops at the position of the developing portion facing the photosensitive drum 4a, and further there. After the developing sleeve 5b of No. 5 is positioned so as to face the photosensitive drum 4a with a minute gap (about 300 μm), the latent image on the photosensitive drum 4a is developed by the toner contained in the developing container.

In the developing device 5 for developing, the toner contained in the container is fed to the coating roller 5a by the feeding mechanism, and is rotated by the supply of the toner by the rotation of the coating roller 5a and the regulation of the toner layer pressure by the blade 5c. A predetermined thin toner layer is applied and formed on the developing sleeve 5b, and a triboelectric charge is applied to the toner.

At the time of development, a developing bias is applied between the developing sleeve 5b and the photosensitive drum 4a, whereby the toner on the developing sleeve 5b is transferred corresponding to the latent image on the photosensitive drum 4a, and the latent image is developed. Then, the toner image is visualized. The developing sleeve 5b of each developing device 5 is
Is rotated to the developing position, it is connected to the high-voltage power source for developing each color provided in the apparatus main body 9, and the developing bias of the voltage selected for each color is applied.

As shown in FIG. 5, the fixing section 6 is provided with a pressure roller 6a which is rotationally driven, and a fixing roller 6b which presses the pressure roller 6a to apply heat and pressure to the transfer material 2. The transfer material 2 separated from the transfer drum 3 and sent to the fixing unit 6 is
The toner image of each color is fixed on the transfer material 2 by being conveyed by the pressure roller 6a and being passed to the fixing unit 6, and by the heat and pressure of the fixing roller 6b during the passage.

A cleaning member 6c is in contact with the fixing roller 6b, and the toner adhering to the roller 6b is removed by the cleaning member 6c.

Next, the image forming operation of the image forming apparatus having the above-mentioned components will be described. The feeding roller 1b shown in FIG. 5 is rotated to separate one sheet of the transfer material 2 in the sheet feeding cassette 1a, and the sheet is fed to the transfer drum 3a. Transfer drum 3a
Rotates in the direction of the arrow in FIG. 5, grips the tip of the transfer material 2 fed to it with the gripper 3f, and electrostatically adsorbs it on its peripheral surface.

The photosensitive drum 4a is rotated in the direction of the arrow in FIG. 5 in synchronism with the rotation of the transfer drum 3a, and the surface of the photosensitive drum 4a is uniformly charged by the primary charging device 4b. Thus, the image light λ of the magenta image is emitted to form a latent image of the magenta image on the photosensitive drum 4a. Simultaneously with the formation of this latent image, the magenta developing device 5M is driven so that the magenta toner adheres to the latent image formed on the photosensitive drum 4a so as to have a developing bias voltage of the same polarity as the charging polarity of the image carrier 4a and substantially the same potential. To develop a magenta toner image on the photosensitive drum 4a.
Then, a transfer voltage having a polarity opposite to that of magenta toner is applied to the transfer drum 3 via the shaft 3e to transfer the magenta toner image on the photosensitive drum 4a onto the transfer material 2 on the transfer drum 3a.

When the transfer of the magenta toner image is completed as described above, the next developing device rotates to be positioned at the developing position facing the photosensitive drum 4a, and similarly, latent images of cyan, yellow and black are formed. Then, development and transfer of the obtained toner image are sequentially performed to form a color image on the transfer material 2.

The transfer material 2 on which the toner image is finished is separated from the transfer drum 3a by the transfer material separating member 3u and conveyed to the fixing section 6, where the toner image is fixed by the fixing section 6 and then the discharging roller pair. Is discharged to the discharge tray 8 by 7,
The image formation is completed. When the transfer material 2 is separated from the transfer drum 3a, the surface potential of the transfer drum 3a is adjusted by the transfer drum surface charge eliminating roller 3n to prepare for the next transfer material adsorption.

Next, in the image forming apparatus capable of separating the transfer drum 3a and the photosensitive drum 4a, the structure for pulling out the transfer drum 3a in the axial direction will be described.

A description will be given below with reference to FIGS. 1, 2 and 5. FIG. 1 is a partial bird's-eye view of the transfer drum unit when the inside of the apparatus main body shown in FIG. 5 is viewed obliquely from above and is a view that best represents the features of the present invention.

In FIGS. 1 and 2, the front plate 106 of the apparatus main body is provided with an opening 107 for pulling the transfer drum unit 3 out of the apparatus. Inner side plates 100, 101 adjacent to the longitudinal end of the transfer drum unit 3
Is provided, and outside side plates 102 and 103 are provided on the outside thereof. The inner side plates 100 and 101 support the suction roller 3g, the charge eliminating roller 3n, and the separation claw 3u shown in FIG. Separation guides 20 are provided on the outer side plates 102 and 103, respectively, and support the shaft end portion 3s of the transfer drum 3a. A compression coil spring 21 is mounted inside the separation guide 20 and presses the shaft end portion 3s of the transfer drum 3a toward the photosensitive drum 4a.

Further, the separation lever 30 for separating the transfer drum 3a from the photosensitive drum 4a is provided with outer side plates 102 and 103.
It is rotatably provided around a shaft 31 fixed on the upper side, and is in contact with the shaft end 3s of the transfer drum by a projection 30d formed at an appropriate position thereof.

Normally, since the transfer drum 3a is pressed toward the photosensitive drum 4a by the urging force of the compression coil spring 21 provided inside the separation guide 20, the position of the separation lever 30 is at the axial end portion of the transfer drum 3a. It is determined by the position of 3s.

Manual separation cams 40 are provided in the vicinity of both ends of the transfer drum 3a as means for manually separating the transfer drum 3a when the photosensitive drum cartridge 4a is attached or detached, or when the transfer material on the transfer drum 3a is removed. It is arranged. The manual separation cam 40 is the transfer drum 3a.
Extending parallel to the longitudinal direction of the outer side plates 102, 10
3 are connected by a manual separation shaft 41 supported by 3.
Further, an operation lever 42 shown by a broken line is provided at one end of the manual separation shaft 41.

In FIG. 2, when the operation lever 42 in the fixed position shown by the broken line is rotated to the operating position shown by the chain double-dashed line, the manual separation cam 40 is also rotated integrally via the manual separation shaft 41. Move. When the manual separation cam 40 rotates, it comes into contact with the separation lever 30, and when it rotates further, the protrusion 30d of the separation lever 30 presses the shaft end 3s of the transfer drum 3a,
The transfer drum 3a is separated from the photosensitive drum 4a against the biasing force of the compression coil spring.

Further, the outer side plates 102 and 103 are provided with a spacing plate 60 which is guided by a guide member (not shown) to move linearly, and one end of the spacing plate 60 is always in contact with the spacing lever 30 by a spring (not shown). Is urged to.

A sequence spacing cam 50 for spacing the transfer drum 3a in the image forming sequence is provided adjacent to the spacing plate 60 when the transfer speed and the fixing speed are different from each other. It is fixed to a sequence cam shaft 51 extending parallel to the separation shaft 41. The sequence cam shaft 51 includes front and rear side plates 106,
It is rotatably supported by 108 and is driven by half-rotation control or the like by a driving means (not shown). When the sequence spacing cam 50 rotates, the sequence spacing cam 50 contacts one end of the spacing plate 60, so that the other end of the spacing plate 60 is moved to the spacing lever 3.
The protrusion 30d of the separating lever 30 presses the shaft end 3s of the transfer drum 3a, and the transfer drum 3a can be separated from the photosensitive drum 4a against the biasing force of the compression coil spring 21.

Next, the operation of separating the transfer drum 3a from the photosensitive drum 4a in this structure will be described with reference to FIG.

First, when the photosensitive drum unit 4 is attached or detached, and the transfer material 2 is not normally conveyed, the transfer drum 3a
A manual separating operation performed when removing the transfer material 2 that is still held (so-called jam processing) will be described.

When the operation lever 42 at the fixed position shown by the broken line is operated to rotate about the manual separation shaft 41 to the position shown by the chain double-dashed line, the manual separation cam 40 also rotates integrally. When the manual separation cam 40 rotates, the separation lever 3
When it contacts 0 and rotates further, the separation lever 30 is rotated against the biasing force of the compression coil spring 21. As a result, the transfer drum 3a is guided by the separation guide 20 and is exposed to the photosensitive drum 3a.
Away from. The position of each member at the time of separation is shown by a chain double-dashed line.

Next, the separating operation of the transfer drum 3a in the image forming sequence when the transfer speed and the fixing speed are different will be described.

When the final transfer step of image formation is completed,
The sequence cam shaft 51, to which the sequence separation cam 50 is fixed, is rotated about 180 ° by a driving means (not shown).
As a result, the sequence separation cam 50 contacts one end of the separation plate 60, and the other end of the separation plate 60 is attached to the separation lever 3.
0 is rotated against the biasing force of the compression coil spring 21.
As a result, the transfer drum 3a is separated from the photosensitive drum 4a. Further, the positions of the respective members at the time of separation are shown by a two-dot chain line. At this time, since the spacing plate 60 presses the spacing lever 30 by the biasing force of the spring, it assists the rotation of the sequence spacing cam 50, and the driving torque of the sequence spacing cam 50 can be reduced.

Next, the case where the transfer drum unit 3 is pulled out from the apparatus main body will be described.

First, the operation lever 42 is operated / rotated to bring the transfer drum 3a into a separated state. At this time, the separation plate 60
Is separated from the sequence separation cam 50 because the manual separation cam 40 rotates the separation lever 30. In this state, if the fixing means (not shown) of the transfer drum unit 3 to the apparatus main body is released, the transfer drum unit 3 excluding the sequence separation cam 50 and the sequence cam shaft 51 can be easily pulled out in the axial direction. Therefore, the workability of assembly and maintenance of the transfer drum unit can be improved.

Second Embodiment Next, a second embodiment of the image forming apparatus according to the present invention will be described with reference to FIG. The same reference numerals are given to those having the same functions as those according to the first embodiment, and the description thereof will be omitted.

In this embodiment, the driving torque of the sequence separation cam for separating the transfer drum 3a from the photosensitive drum 4a in the image forming sequence is reduced. The configuration shown in FIG. 3 is different from that of FIG. 2 in that the sequence spacing cam 50 abuts on a roller 61 rotatably fixed to a linear motion member (not shown) on the side plates 102 and 103, and the roller 61 also separates. That is, the lever 30 is also configured to abut. As a result, the sequence separation cam 50 rotates and comes into contact with the roller 61, and the roller 61 linearly moves integrally with a linear motion member (not shown) and rotates to separate the separation lever 30 against the biasing force of the compression coil spring 21. The transfer drum 3a is separated from the photosensitive drum 4a. At this time, the sequence spacing cam 50, the roller 61, and the spacing lever 30 form a rolling pair, and the sequence spacing cam 5
The drive torque of 0 is significantly reduced.

Third Embodiment Next, a third embodiment of the image forming apparatus of the present invention will be described with reference to FIG.

In this embodiment, the drive torque of the sequence separation cam 50 for separating the sequence transfer drum 3a is further reduced as compared with the second embodiment.

The configuration shown in FIG. 4 is different from that of FIG. 3 in that the plate 62 is swingably fixed to the shaft 63 on the inner side plates 102 and 103, and the roller 61 is rotatable on the plate 62. It is supported by. As a result, in the first embodiment, the movement of the linear motion member is the sliding pair, whereas in the present embodiment, the swing of the plate 62 is the rolling pair, and as a result, the driving torque of the sequence spacing cam 50 is further reduced. Become.

[0060]

As described above, according to the image forming apparatus of the present invention, at least the separation guide which supports the transfer body carrier and guides the separation, and the shaft end of the transfer body carrier which is rotated. A separation lever that presses the portion, a manual separation cam that presses the separation lever, a sequence separation cam that presses the separation lever, and a member that transmits displacement between the separation lever and the sequence separation cam. With the configuration having the spacing means, 1) even in the image forming apparatus having the spacing means for manual spacing and sequence spacing, the transfer body carrier is pulled out from the apparatus main body in the axial direction of the transfer body carrier. It becomes possible to facilitate the assembly and maintenance work. 2) Since the member for transmitting the displacement is additionally provided between the separation lever and the sequence separation cam, the driving torque of the sequence separation cam can be reduced.

[Brief description of drawings]

FIG. 1 is a partial bird's-eye view near a transfer drum of an image forming apparatus according to a first exemplary embodiment.

FIG. 2 is an explanatory diagram for explaining a separating operation of the image forming apparatus according to the first embodiment.

FIG. 3 is an explanatory diagram for explaining a separating operation of the image forming apparatus according to the second embodiment.

FIG. 4 is an explanatory diagram for explaining a separating operation of the image forming apparatus according to the third embodiment.

FIG. 5 is an overall configuration diagram of the image forming apparatus according to the first embodiment.

FIG. 6 is a schematic configuration diagram showing a multicolor electronic copying machine which is a conventional image forming apparatus.

7 is a partial bird's-eye view in the vicinity of the transfer drum of the image forming apparatus of FIG.

[Explanation of symbols]

 3a Transfer drum (transfer member carrier) 4a Photosensitive drum (image carrier) 20 Separation guide 30 Separation lever 40 Manual separation cam 50 Sequence separation cam 60 Separation plate 61 Roller

Claims (3)

[Claims] 1. An image forming apparatus in which a transfer material carrier can be separated from an image carrier, at least a separation guide supporting the transfer material carrier and guiding the separation, and the transfer material carrier being rotated. A separation lever that presses the shaft end of the body, a manual separation cam that presses the separation lever, a sequence separation cam that presses the separation lever, and a member that transmits displacement between the separation lever and the sequence separation cam. An image forming apparatus comprising: a separating unit including: 2. When the transfer material carrier is pulled out from the apparatus main body in the axial direction, members for separation except the sequence separation cam are pulled out integrally with the transfer material carrier. 1. The image forming apparatus of 1. 3. The image according to claim 1, wherein the member for transmitting the displacement between the separation lever and the sequence separation cam is a rotary roller on a direct-acting member or a rotary roller on an oscillating member. Forming equipment.