JP2015075555A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus that can prevent an incorrect operation by a user to suppress damage to image holding bodies and/or a belt member.SOLUTION: An image forming apparatus includes: a housing; an image forming unit that supports image holding bodies on which toner images are formed and is withdrawably accommodated in the housing; and a belt unit that supports a belt member performing image formation while in contact with the image holding bodies with a pair of support members, brings into contact or separates the belt member with/from the image holding bodies through the operation of a handle operation part, and is withdrawably accommodated in the housing, where the handle operation part can be operated when both the image forming unit and the belt unit are accommodated at predetermined positions in the housing.

Description

  The present invention relates to an image forming apparatus.

  A pedestal equipped with a transfer processing unit for transferring the toner image on the photosensitive member to transfer paper is provided in the apparatus main body so that the pulling shaft can be rotated and the movement in the axial direction is restricted. There is also known an image forming apparatus in which a positioning cam is provided on the pulling shaft, and the positioning cam can be engaged with and disengaged from the apparatus main body by rotation of the pulling shaft (Patent Document 1).

JP-A-6-35252

  An object of the present invention is to suppress damage to an image carrier and / or a belt member.

In order to solve the above problem, an image forming apparatus according to claim 1,
A housing,
An image forming unit that supports an image carrier on which a toner image is formed and is housed so as to be able to be drawn out from the housing;
A belt member on which image formation is performed in contact with the image carrier is supported by a pair of support members, and the belt member is brought into contact with and separated from the image carrier by operating a handle operation unit. A belt unit accommodated so as to be drawable with respect to the housing;
When the handle operation unit is housed in a predetermined position of the casing, the handle operation is enabled when both the image forming unit and the belt unit are accommodated.
It is characterized by that.

According to a second aspect of the present invention, in the image forming apparatus according to the first aspect,
The handle operating portion includes a rotation shaft disposed through the pair of support members, a cam member fixed to one end of the rotation shaft outside the one support member, and one end of the one support member. And a lock member that is movable between a first stop position and a second stop position in the pull-out direction of the belt unit, and when the lock member moves to the first stop position, The cam member is rotatable, and the cam member is not rotatable when the lock member is moved to the second stop position;
It is characterized by that.

According to a third aspect of the present invention, in the image forming apparatus according to the first or second aspect,
The housing includes a swinging member supported so as to be swingable with one end in contact with the image forming unit and the other end in contact with the lock member, and the image forming unit is positioned at a predetermined position of the housing And the other end side of the swinging member comes into contact with the lock member and swings, the lock member moves to the first stop position, and the image forming unit is pulled out of the housing. The other end side of the swinging member swings in a direction away from the lock member, and the lock member moves to the second stop position.
It is characterized by that.

  According to the present invention, it is possible to prevent damage to the image carrier and / or the belt member.

2 is a schematic cross-sectional view showing an internal configuration of the image forming apparatus 1. FIG. 2 is a schematic diagram for explaining a unit configuration of the image forming apparatus 1. FIG. (A) is a schematic diagram of a state in which the image forming unit 130 is pulled out from the housing 100, and (b) is a schematic diagram of a state in which the belt unit 150 is pulled out from the housing 100. FIG. 5 is a schematic diagram for explaining an operation procedure for pulling out a belt unit 150 from a housing 100. (A) is a schematic cross-sectional view for explaining the structure and operation of the handle operation unit 200 in a state where the image forming unit 130 is accommodated in the housing 100, and (b) is a handle operation unit in a state where the image forming unit 130 is pulled out. 200 is a schematic cross-sectional view for explaining the structure and action of FIG. 200, and FIG. 9C is a schematic view with a viewpoint on the housing 100 side showing the positional relationship between the cam member 203 and the lock member 204. FIG. 6 is a schematic diagram for explaining the action of the lock member 204 when the image forming unit 130 is pulled out from the housing 100. FIG. 10 is a schematic diagram for explaining the operation of the lock member 204 when the belt unit 150 is pulled out from the housing 100.

Next, the present invention will be described in more detail with reference to the drawings with reference to embodiments and specific examples. However, the present invention is not limited to these embodiments and specific examples.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.
In order to facilitate understanding of the following description, in the drawings, the front-rear direction is the X-axis direction, the left-right direction is the Y-axis direction, and the up-down direction is the Z-axis direction.

(1) Overall Configuration and Operation of Image Forming Apparatus (1.1) Overall Configuration of Image Forming Apparatus FIG. 1 is a schematic cross-sectional view showing an example of a schematic configuration of an image forming apparatus according to the present embodiment.
The image forming apparatus 1 includes an image forming unit 10, a paper feeding device 20 attached to one end of the image forming unit 10, and a paper discharge unit 30 that is provided at the other end of the image forming unit 10 and discharges printed paper. And an operation information unit 40 and an image processing unit 50 that generates an image from print information transmitted from a host device.

  The image forming unit 10 includes a system control device 11 (not shown in FIG. 1), an exposure device 12, a photosensitive unit 13, a developing device 14, a transfer unit 15, paper transport devices 16a, 16b, and 16c, and a fixing device 17. The image information received from the image processing unit 50 is formed as a toner image on the paper P sent from the paper feeding device 20.

  The paper feeding device 20 supplies paper to the image forming unit 10. In other words, a plurality of trays for storing different types of paper P (for example, material, thickness, paper size, and paper size) are provided, and the paper P fed out from any one of the plurality of trays is provided as an image forming unit. 10 is configured to supply.

  The paper discharge unit 30 discharges the paper P on which the image is output by the image forming unit 10. For this purpose, the paper discharge unit 30 includes a paper discharge tray from which the paper P after image output is discharged. The paper discharge unit 30 may have a function of performing post-processing such as cutting and stapling (stitch binding) on the sheet bundle output from the image forming unit 10.

  The image forming unit 10 is provided with an operation information unit 40. The operation information section 40 is used for inputting various settings and instructions and displaying information. That is, it corresponds to a so-called user interface, and is specifically configured by combining a liquid crystal display panel, various operation buttons, a touch panel, and the like.

(1.2) Configuration and Operation of Image Forming Unit In the image forming apparatus 1 having such a configuration, the paper feeding device 20 in accordance with the timing of image formation starts from the tray specified for each print in the print job. The fed paper is sent to the image forming unit 10.

  The photoconductor unit 13 includes a photoconductor drum 131 that is provided in parallel below the exposure apparatus 12 (in the Z direction) and serves as an image carrier that is rotationally driven. A charger 132, an exposure device 12, a developing device 14, a primary transfer roller 152, and a cleaning blade 134 are arranged along the rotation direction of the photosensitive drum 131.

The developing device 14 has a developing housing 141 in which a developer is accommodated. In the developing housing 141, a developing roller 142 disposed to face the photosensitive drum 131 is disposed, and a layer regulating member (not shown) that regulates the layer thickness of the developer is disposed close to the developing roller 142. Has been.
Each of the developing devices 14 is configured in the same manner except for the developer contained in the developing housing 141, and each forms a toner image of yellow (Y), magenta (M), cyan (C), and black (K). .

  The surface of the rotating photosensitive drum 131 is charged by the charger 132 and an electrostatic latent image is formed by the latent image forming light emitted from the exposure device 12. The electrostatic latent image formed on the photosensitive drum 131 is developed as a toner image by the developing roller 142.

  The transfer unit 15 includes an intermediate transfer belt 151 onto which the color toner images formed on the photoconductive drums 131 of the photoconductor units 13 are transferred, and the color toner images formed on the photoconductor units 13 to the intermediate transfer belt. A primary transfer roller 152 that sequentially transfers (primary transfer) to 151; a secondary transfer roller 153 that collectively transfers (secondary transfer) each color toner image superimposed and transferred onto the intermediate transfer belt 151 to a sheet as a recording medium; The backup roller 165 is disposed opposite to the secondary transfer roller 153 and applied with a transfer voltage.

  Each color toner image formed on the photoconductive drum 131 of each photoconductive unit 13 is intermediately transferred by a primary transfer roller 152 to which a predetermined transfer voltage is applied from a power supply device (not shown) controlled by the system control device 11. Electrostatic transfer (primary transfer) is sequentially performed on the belt 151 to form a superimposed toner image in which toner of each color is superimposed.

  The superimposed toner image on the intermediate transfer belt 151 is conveyed to a region (secondary transfer unit TR) where the secondary transfer roller 153 is disposed as the intermediate transfer belt 151 moves. When the superimposed toner image is conveyed to the secondary transfer portion TR, the paper P is supplied from the paper feeding device 20 to the secondary transfer portion TR in accordance with the timing. A predetermined transfer voltage is applied to the backup roller 165 from a power supply device or the like controlled by the system controller 11, and the multiple toner images on the intermediate transfer belt 151 are collectively transferred to the paper P.

  Residual toner on the surface of the photosensitive drum 131 is removed by the cleaning blade 134 and collected in a waste toner container (not shown). The surface of the photosensitive drum 131 is recharged by the charger 132.

The fixing device 17 includes an endless fixing belt 17a that rotates in one direction, and a pressure roller 17b that is in contact with the circumferential surface of the fixing belt 17a and rotates in one direction, and includes the fixing belt 17a and the pressure roller 17b. A nip portion (fixing region) is formed by the pressure contact region.
The paper P on which the toner image is transferred in the transfer unit 15 is conveyed to the fixing device 17 via the paper conveying device 16a in a state where the toner image is not fixed. The toner image is fixed on the sheet P conveyed to the fixing device 17 by the action of pressure bonding and heating by a pair of fixing belts 17a and a pressure roller 17b.

After the fixing, the paper P passes through the paper transport device 16b and is sent to the paper discharge unit 30.
When performing image output on both sides of the paper P, the front and back of the paper P are reversed by the paper transport device 16c and sent again to the secondary transfer unit TR in the image forming unit 10. Then, after the toner image is transferred and the transferred image is fixed, the toner image is sent to the paper discharge unit 30. The paper P sent to the paper discharge unit 30 is discharged onto the paper discharge tray after being subjected to post-processing such as cutting and stapling (needle binding) as necessary.

(2) Unit Configuration and Operation of Image Forming Apparatus FIG. 2 is a schematic diagram for explaining the unit configuration in the image forming apparatus 1, and FIG. 3A is a state in which the image forming unit 130 is pulled out from the housing 100. FIG. 3B is a schematic diagram of a state in which the belt unit 150 is pulled out from the housing 100, and FIG. 4 is a schematic diagram for explaining an operation procedure for replacing the image forming unit 130 and the belt unit 150. 5A is a rear view and a schematic cross-sectional view illustrating the structure and operation of the handle operation unit 200 in a state in which the image forming unit 130 is accommodated in the housing 100. FIG. 5B is a diagram in which the image forming unit 130 is pulled out. It is a cross-sectional schematic diagram explaining the structure and effect | action of the steering wheel operation part 200 in a state.

  As shown in FIG. 2, the image forming apparatus 1 includes an image forming unit 130 that houses a plurality of photoreceptor units 13 (see FIG. 1), and a belt unit 150 that houses a transfer unit 15. It is housed and arranged so that it can be pulled out.

(2.1) Image Forming Unit As shown in FIG. 3A, the image forming unit 130 has a handle 135 for pulling out the image forming unit 130 in the direction (Y direction) perpendicular to the transport direction of the paper P. The photosensitive member unit 13 can be pulled out to the near side (Y direction: arrow A in the figure) by operating the handle 135.

  The replacement of each photoconductor unit 13 is performed by pulling the four photoconductor units 13 together as the image forming unit 130 to the front side (Y direction: arrow A in the figure) and then from above the respective photoconductor units 13. (Z direction: arrow B in the figure).

(2.2) Belt Unit As shown in FIG. 3B, the belt unit 150 has a handle 202 for pulling out the belt unit 150 in the direction (Y direction) perpendicular to the transport direction of the paper P. By rotating the handle 202, the intermediate transfer belt 151 can be pulled out to the front side (Y direction: arrow A in the figure) after being separated from the respective photoreceptor units 13.

  The transfer unit 15 can be exchanged from the upper side (Y direction: arrow A in the figure) as the belt unit 150, and then attached or detached from above (Z direction: arrow B in the figure).

(2.3) Procedure for Replacing Image Forming Unit and Belt Unit The procedure for replacing the image forming unit 130 and the belt unit 150 in the image forming apparatus 1 having such a unit configuration will be described with reference to FIG.

  4A-1 is a schematic front view showing a state where the image forming unit 130 and the belt unit 150 are accommodated in the casing 100 of the image forming apparatus 1, and the intermediate transfer belt 151 is in contact with the respective photosensitive drums 131. FIG. FIG. 4 and FIG. 4A-2 are schematic side views of the same state. When the belt unit 150 is pulled out from such a state, first, the handle 202 is rotated to separate the intermediate transfer belt 151 from each photosensitive drum 131 (FIGS. 4B-1 and 4B-2). )).

  Next, when the handle 135 of the image forming unit 130 is rotated upward (arrow A in the figure), the fixing lever claws (not shown) provided on both sides of the handle 135 are removed, and the image forming unit 130 is The body 100 is opened and temporarily moves from the housing 100 to the operator side (Y direction) (FIGS. 4C-1 and 4C-2).

In such a state, the image forming unit 130 is pulled out to the operator side (Y direction), and the photosensitive unit 13 is replaced.
In this state, the belt unit 150 can also be pulled out to the operator side (Y direction) (FIGS. 4D-1 and 4D-2).

In such an exchange operation, the operator rotates the handle 202 in a state where the image forming unit 130 is accidentally pulled out, and the belt unit 150 or the image formation is performed with the intermediate transfer belt 151 in contact with the photosensitive drum 131. There is a possibility that the unit 130 may be pulled out.
As a result, the surface of the photosensitive drum 131 and the surface of the intermediate transfer belt 151 may be damaged by rubbing between the contacted intermediate transfer belt 151 and the photosensitive drum 131.

  In the image forming apparatus 1 according to the present embodiment, the handle 155 can be rotated only when the handle 202 is housed in a predetermined position of the housing 100 together with the image forming unit 130 and the belt unit 150. The handle operating unit 200 is provided.

(2.4) Configuration of Handle Operation Unit As shown in FIG. 5, the handle operation unit 200 includes a rotation shaft 201, a handle 202, a cam member 203, a lock member 204, and a swing member 220.

  The rotating shaft 201 is disposed through a front plate 211 and a rear plate 212 as a pair of support members in the transfer unit 15. A handle 202 is fixed to one end of the rotary shaft 201 on the front plate 211 side, a cam member 203 is fixed to one end on the rear plate 212 side, and the cam member 203 is rotated outside the rear plate 212 by rotating the handle 202. Rotates.

The lock member 204 is formed as a cylindrical stepped shaft as a whole, and includes a pin portion 204a having a small diameter at one end side, a shaft portion 204b having a large diameter at the center portion, and a shaft portion 204c having a small diameter at the other end side.
The lock member 204 has a large-diameter shaft portion 204 b inserted through a through hole 212 a provided in the rear plate 212, and a spring member 205 inserted through a small-diameter shaft portion 204 c, and a holder 206 provided on the rear plate 212. It is supported.

The swing member 220 has one end side 220a in contact with the image forming unit 130 via a pin 102 and a support member 101 projecting from the housing 100 on the housing side of the belt unit 150, and the other end side 220b is a lock member. The pin portion 204a of 204 is supported so as to be able to swing.
In a state where both the image forming unit 130 and the belt unit 150 are accommodated in the housing 100, the swing member 220 is inverted in the vertical direction (Z direction), and the lock member 204 is moved to the first stop position. Move (see FIG. 5A).
When the image forming unit 130 in contact with the one end side 220 a is pulled out, the other end side 220 b in contact with the lock member 204 swings toward the housing 100, and the lock member 204 is biased by the spring member 205. To the second stop position (see FIG. 5B).

FIG. 5C is a schematic view with a viewpoint on the housing 100 side showing the positional relationship between the cam member 203 and the lock member 204.
The cam member 203 rotates integrally with the handle 202 around the axis c1 of the rotation shaft 201, and the rotation locus is represented by a distance R0 from the axis c1 of the rotation shaft 201 to the tip end portion 203a of the cam member 203. The
The lock member 204 is a stepped shaft composed of a small-diameter pin portion 204a and a large-diameter shaft portion 204b. The distance from the axis c1 of the rotation shaft 201 to the outer peripheral surface of the small-diameter pin portion 204a is R1, and the rotation shaft 201 When the distance from the axis c1 to the outer peripheral surface of the large-diameter shaft portion 204b is R2, they are arranged with a relationship of R1 <R0 <R2.

  As a result, in a state in which the image forming unit 130 is accommodated in the housing 100, the lock member 204 moves to the first stop position, and the distal end portion 203a of the cam member 203 and the lock member 204 have R0 <R2. That is, the handle 202 can be rotated without interference between the distal end portion 203a of the cam member 203 and the outer peripheral surface of the pin portion 204a of the lock member 204 (see FIG. 5A).

  When the image forming unit 130 is pulled out, the lock member 204 is urged by the spring member 205 and moves to the second stop position, and the distal end portion 203a of the cam member 203 and the lock member 204 have R1 <R0, that is, the cam. The distal end portion 203a of the member 203 interferes with the outer peripheral surface of the large-diameter shaft portion 204b of the lock member 204, so that the handle 202 becomes inoperable (see FIG. 5B).

(3) Replacing Operation of Image Forming Unit and Belt Unit and Action of Handle Operation Unit FIG. 6 is a schematic diagram for explaining the action of the lock member 204 when the image forming unit 130 is pulled out from the casing 100, and FIG. FIG. 5 is a schematic diagram for explaining the operation of the lock member 204 when the belt unit 150 is pulled out from the body 100.

(3.1) Image Forming Unit Replacement Operation FIG. 6A-1 shows that the image forming unit 130 and the belt unit 150 are accommodated in the casing 100 of the image forming apparatus 1, and the intermediate transfer belt 151 is exposed to the respective photosensitive elements. A front view of the handle operating unit 200 in contact with the body drum 131 and FIG. 6A-2 are schematic side views of the same state.

  In this state, the rocking member 220 is inverted in the vertical direction (Z direction), and the lock member 204 is located at the first stop position. For this reason, the handle 202 can be rotated without interfering with the distal end portion 203 a of the cam member 203 and the outer peripheral surface of the pin portion 204 a of the lock member 204, and the handle 202 is illustrated prior to the drawing of the image forming unit 130. 6, the intermediate transfer belt 151 can be separated from the respective photosensitive drums 131 (see FIGS. 6B-1 and 6B-2).

Next, when the handle 202 is rotated in the direction of arrow A in FIG. 6, the intermediate transfer belt 151 is separated from the respective photosensitive drums 131, and the image forming unit 130 is temporarily moved from the housing 100 to the operator side ( (Y direction). As a result, one end side 220a of the swing member 220 is released from contact with the image forming unit 130, the other end side 220b in contact with the lock member 204 swings toward the housing 100, and the lock member 204 is a spring. The member 205 is biased to move to the second stop position.
Then, the front end portion 203a of the cam member 203 and the outer peripheral surface of the large-diameter shaft portion 204b interfere with each other so that the handle 202 cannot be rotated, and contact between the separated photosensitive drum 131 and the intermediate transfer belt 151 is prevented. (See FIGS. 6 (c-1) and (c-2)).

Then, the image forming unit 130 is pulled out from the housing 100 to the operator side (Y direction), and the photosensitive unit 13 is replaced.
In this state, the distal end portion 203a of the cam member 203 interferes with the outer peripheral surface of the large-diameter shaft portion 204b, so that the handle 202 cannot be rotated, and the contact between the separated photosensitive drum 131 and the intermediate transfer belt 151 occurs. Is prevented (see FIGS. 6D-1 and 6D-2).

  That is, in the replacement operation of the image forming unit 130 that is performed by pulling the image forming unit 130 out of the housing 100 while the belt unit 150 is accommodated in the housing 100, the image forming unit 130 is pulled out of the housing 100. In this state, the rotation operation of the handle 202 cannot be performed, and an operator's erroneous operation can be prevented and damage to the photosensitive drum 131 and the intermediate transfer belt 151 can be suppressed.

(3.2) Belt Unit Replacement Operation FIG. 7A-1 shows that the image forming unit 130 and the belt unit 150 are accommodated in the casing 100 of the image forming apparatus 1, and the intermediate transfer belt 151 is a photosensitive member. FIG. 7A-2 is a front view of the handle operating unit 200 in contact with the drum 131. FIG. 7A-2 is a schematic side view of the same state.

  In this state, the rocking member 220 is inverted in the vertical direction (Z direction), and the lock member 204 is located at the first stop position. Therefore, the handle 202 can be rotated without interfering with the distal end portion 203a of the cam member 203 and the outer peripheral surface of the pin portion 204a of the lock member 204, and the handle 202 is rotated before the image forming unit 130 is pulled out. By operating, the intermediate transfer belt 151 can be separated from each photosensitive drum 131.

 Next, when the handle 202 is rotated in the direction of arrow A in FIG. 7, the intermediate transfer belt 151 is separated from the respective photosensitive drums 131, and the belt unit 150 is moved from the housing 100 to the operator side (Y direction). (See FIGS. 7B-1 and 7B-2).

Next, when the belt unit 150 is pulled out from the housing 100, the other end side 220b of the swing member 220 is released from contact with the pin portion 204a of the lock member 204, and the lock member 204 is moved to the spring member 205. Energized to move to the second stop position.
Then, the front end portion 203a of the cam member 203 and the outer peripheral surface of the large-diameter shaft portion 204b interfere with each other so that the handle 202 cannot be rotated, and contact between the separated photosensitive drum 131 and the intermediate transfer belt 151 is prevented. (See FIGS. 7 (c-1) and (c-2)).

  Then, the belt unit 150 is pulled out from the housing 100 to the operator side (Y direction), and the transfer unit 15 is exchanged (see FIGS. 7D-1 and 7D-2).

(3.3) Mounting operation of image forming unit and belt unit In the above description, the image forming unit 130 and the belt unit 150 are pulled out from the state in which the image forming unit 130 and the belt unit 150 are accommodated in the housing 100 of the image forming apparatus 1. Explained the exchange operation. However, the limitation of the rotation operation by the handle operation unit 200 is also effective in the case of performing a push-in operation for accommodating the image forming unit 130 or the belt unit 150 in the housing 100 of the image forming apparatus 1.

  For example, when the image forming unit 130 is pulled out with respect to the housing 100 and the one end side 220a of the swinging member 220 is not in contact with the image forming unit 130, the lock member 204 is located at the second stop position. As a result, the distal end portion 203a of the cam member 203 and the outer peripheral surface of the large-diameter shaft portion 204b interfere with each other so that the handle 202 cannot be rotated, and the photosensitive drum 131 and the intermediate transfer belt 151 are kept apart. Is done. Therefore, even when the image forming unit 130 is pushed in freely, contact between the photosensitive drum 131 and the intermediate transfer belt 151 is prevented, and damage to the photosensitive drum 131 and the intermediate transfer belt 151 can be suppressed.

Even if the pushing operation for housing the belt unit 150 in the housing 100 is performed in a state where the image forming unit 130 is housed in the housing 100, the other end side 220 b of the swing member 220 and the pin of the lock member 204 are used. Since the portion 204a is not in contact, the lock member 204 is biased by the spring member 205 and is positioned at the second stop position.
For this reason, the front end portion 203a of the cam member 203 interferes with the outer peripheral surface of the large-diameter shaft portion 204b, the handle 202 becomes inoperable, and the photosensitive drum 131 and the intermediate transfer belt 151 are separated from each other. Retained. Therefore, even when the belt unit 150 is pushed in freely, contact between the photosensitive drum 131 and the intermediate transfer belt 151 is prevented, and damage to the photosensitive drum 131 and the intermediate transfer belt 151 can be suppressed.

  As mentioned above, although embodiment concerning this invention was explained in full detail, this invention is not limited to the said embodiment, A various change is made within the range of the summary of this invention described in the claim. Is possible.

For example, in the present embodiment, the intermediate transfer type image forming apparatus 1 including the intermediate transfer belt is described as the belt unit, but the photosensitive drum comes into contact with the photosensitive drum via the recording medium held on the conveyance belt. The present invention can also be applied to a direct transfer type image forming apparatus that transfers and conveys a toner image on a body drum.
Further, the present invention can be applied not only to a tandem image forming apparatus but also to an image forming apparatus provided with a single photosensitive drum.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 10 ... Control apparatus 20 ... Paper feeding apparatus 30 ... Photoconductor unit 40 ... Developing apparatus 50 ... Transfer unit 60 ... Fixing apparatus 100 ... Housing Body 101 ... Supporting part 102 ... Pin 130 ... Image forming unit 131 ... Photosensitive drum 135 ... Handle (image forming unit)
DESCRIPTION OF SYMBOLS 150 ... Belt unit 151 ... Intermediate transfer belt 200 ... Handle operation part 201 ... Rotating shaft 202 ... Handle (belt unit)
203 ... cam member 203a ... tip portion 204 ... lock member 204a ... pin portion
204b ... Shaft part (large diameter)
204c ... Shaft part (small diameter)
205 ... Spring member 206 ... Holder 211 ... Front plate 212 ... Rear plate 212a ... Through hole
220 ... swing member 220a ... one end side (swing member)
220b ... the other end side (swing member)

Claims (3)

A housing,
An image forming unit that supports an image carrier on which a toner image is formed and is housed so as to be able to be drawn out from the housing;
A belt member on which image formation is performed in contact with the image carrier is supported by a pair of support members, and the belt member is brought into contact with and separated from the image carrier by operating a handle operation unit. A belt unit accommodated so as to be drawable with respect to the housing;
When the handle operation unit is housed in a predetermined position of the casing, the handle operation is enabled when both the image forming unit and the belt unit are accommodated.
An image forming apparatus. The handle operating portion includes a rotation shaft disposed through the pair of support members, a cam member fixed to one end of the rotation shaft outside the one support member, and one end of the one support member. And a lock member that is movable between a first stop position and a second stop position in the pull-out direction of the belt unit, and when the lock member moves to the first stop position, The cam member is rotatable, and the cam member is not rotatable when the lock member is moved to the second stop position;
The image forming apparatus according to claim 1. The housing includes a swinging member supported so as to be swingable with one end in contact with the image forming unit and the other end in contact with the lock member, and the image forming unit is positioned at a predetermined position of the housing And the other end side of the swinging member comes into contact with the lock member and swings, the lock member moves to the first stop position, and the image forming unit is pulled out of the housing. The other end side of the swinging member swings in a direction away from the lock member, and the lock member moves to the second stop position.
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.

Images