JP2022086807A - Image forming apparatus - Google Patents

Abstract

To provide an image forming apparatus that can reduce the size of the apparatus while allowing attachment of a regulation member to a support frame.SOLUTION: An image forming apparatus 1 comprises: an apparatus main body 2; and a process cartridge 50 that has a photoconductor drum 51 and a developing roller 52 movable to a contact position and a separation position with respect to the photoconductor drum 51 and is removably mounted on the apparatus main body 2. The apparatus main body 2 includes: a support frame 26 that is arranged on a lateral side of the process cartridge 50 in a drum axis X direction to support the process cartridge 50; an arm 71 that is supported by the support frame 26 and moves the developing roller 52 between the contact position and the separation position; a cam 72 that is movably supported by the support frame 26 and drives the arm 71; and a regulation member 80 that has an engagement pawl 83 engaged with the support frame 26 and a first regulation part 84 in contact with the cam 72 to regulate an upward movement of the cam 72, and is attached to the support frame 26 by the engagement pawl 83 being engaged with the support frame 26.SELECTED DRAWING: Figure 12

Description

The present invention relates to an image forming apparatus.

Conventionally, the developing roller of the process cartridge mounted on the main body of the apparatus is configured to be separable from the photosensitive drum, and an arm for performing an operation for separating the developing roller from the photosensitive drum, a cam for driving the arm, and a drum of the photosensitive drum. An image forming apparatus is known that is arranged laterally to the process cartridge in the axial direction and includes a support frame that supports an arm, a cam, and the process cartridge (see, for example, Patent Document 1).

In the image forming apparatus configured in this way, the arm is driven by moving the cam in the front-rear direction, and a regulating member for restricting the movement of the cam in the upward direction is provided. There is. A regulatory member that regulates the upward movement of the cam is attached to the support frame by screws.

Japanese Unexamined Patent Publication No. 2014-71363

In recent years, in an image forming apparatus, it has been desired to reduce the size of the apparatus. However, when the apparatus is reduced in size, space is restricted in the support frame, and the restricting member is used as a support frame by screws. It may be difficult to install.

Therefore, in the present invention, there is provided an image forming apparatus capable of miniaturizing the apparatus while enabling the restricting member to be attached to the support frame.

The image forming apparatus that solves the above problems has the following features.

That is, the image forming apparatus has an apparatus main body, a photosensitive drum, and a developing roller that can be moved to an abutting position in contact with the photosensitive drum and a separating position away from the photosensitive drum, and is attached to and detached from the apparatus main body. A process cartridge that can be mounted is provided, and the apparatus main body is arranged on the side of the process cartridge in the drum axis direction of the photosensitive drum, and is supported by a support frame that supports the process cartridge and a support frame. An arm that moves the developing roller between the contact position and the separation position, a cam that is movably supported by the support frame and drives the arm, and an engaging claw that engages with the support frame. A regulating member having a first regulating portion that abuts on the cam and restricts the upward movement of the cam, and a regulating member that is attached to the support frame by engaging the engaging claw with the support frame. To prepare for.

In this way, the restricting member is attached to the support frame by engaging the engaging claw with the support frame, so that a space for attaching the restricting member is provided as in the case where the restricting member is attached to the support frame by a screw. I don't need much. Therefore, in the image forming apparatus, it is possible to reduce the size of the apparatus while making it possible to attach the regulating member to the support frame.

Further, the support frame has a protrusion protruding toward the restricting member side, and the restricting member protrudes from the main body toward the support frame side with a plate-shaped main body, and the protrusion is fitted to the plate-shaped main body. It has a hole, and is provided with a positioning portion in which the regulating member is positioned with respect to the support frame by fitting the protrusion into the fitting hole.

As a result, the regulating member can be attached to the support frame in a state of being positioned with respect to the support frame.

Further, the positioning portion has a cylindrical shape in which the fitting hole is formed.

As a result, the positioning unit can be compactly configured.

Further, the first regulating portion has a first protruding portion that protrudes downward from the lower end of the positioning portion and abuts on the upper surface of the cam at the lower end portion.

In this way, by projecting the first protrusion that abuts on the cam from the positioning portion with respect to the support frame, the upward movement of the cam can be accurately regulated.

Further, the lower end of the first protrusion has an arc shape along the rotation direction of the restricting member about the alignment hole axis of the positioning portion.

In this way, since the lower end of the first protrusion has an arc shape, even if the regulating member rotates about the axis of the matching hole, the upper and lower positions of the lower end of the first protrusion that abuts on the upper surface of the cam Can be suppressed from changing, and the accuracy of restricting the upward movement of the cam can be maintained.

Further, the support frame protrudes toward the regulating member at a position separated from the protrusion, and one surface intersecting the rotation direction of the regulating member about the alignment hole axis of the positioning portion, and the one surface. The restricting member includes a projecting piece having an other surface on the opposite side to the one, and the restricting member projects toward the support frame side and abuts on the one surface of the projecting piece, and the one-sided restricting piece and the one-sided restricting piece in the vertical direction. It is provided with a second restricting portion which is arranged at intervals and has an other surface side restricting piece which projects toward the support frame side and abuts on the other surface of the projecting piece.

As a result, the one-side side regulation piece and the other-side side regulation piece of the second regulation part come into contact with the protruding piece of the support frame, so that the regulation member is restricted from rotating around the alignment hole axis, and is regulated. The posture of the member with respect to the support frame can be maintained.

Further, the restricting member has a second protrusion that protrudes from the main body toward the support frame and can come into contact with the support frame in the direction of the drum axis.

As a result, the movement of the regulating member in the drum axis direction is restricted by the contact of the second protrusion with the support frame, and the mounting position of the regulating member with respect to the support frame can be held at an appropriate position in the drum axis direction. ..

Further, the restricting member extends from the main body to a position overlapping the cam when viewed from the drum axis direction, has a plate portion capable of contacting the cam in the drum axis direction, and has a plate portion capable of contacting the cam in the drum axis direction. , The cam is located between the support frame and the plate portion.

As a result, the movement of the cam supported by the support frame in the drum axis direction is restricted by the plate portion, and when the support frame with the cam supported is attached to another frame or the like, the cam moves in the direction away from the support frame. It is possible to prevent the support frame from falling and improve the mountability of the support frame.

Further, the main body of the device includes a main body frame, and the restricting member is arranged between the support frame and the main body frame in the direction of the drum axis.

As described above, by locating the restricting member between the support frame and the main body frame in the drum axis direction, the restricting member can be stably held in a state of being supported by the support frame.

Further, the main body frame is made of resin.

As a result, the weight can be reduced as compared with the case where the main body frame is made of a sheet metal member.

According to the present invention, it is possible to reduce the size of the device while making it possible to attach the regulating member to the support frame.

It is a central sectional view which shows the image forming apparatus. It is a perspective view which shows the inside of the apparatus main body in an image forming apparatus. It is a perspective view which shows the process cartridge. (A) is a right side view showing the process cartridge, and (b) is a left side view showing the process cartridge. It is a side view which looked at the 1st main body frame with the arm, the upper cam, the lower cam, the link arm, and the support frame which supported the regulation member attached, from the left and right inside. FIG. 5 is a side view of the first main body frame in a state where the support frame is removed from FIG. 5 as viewed from the left and right inside. It is a side view which shows the outer surface of the support frame which supported the arm, the upper cam, the lower cam, the link arm, and a regulation member. It is a perspective view which shows the regulation member. (A) is a left side view showing the regulating member, (b) is a front view showing the hs regulating member, and (c) is a plan view showing the regulating member. It is a partial side view which shows the outer surface of a support frame. FIG. 5 is a sectional view taken along the line AA of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. FIG. 5 is a sectional view taken along the line CC of FIG.

Next, a mode for carrying out the present invention will be described with reference to the accompanying drawings.

[Image forming device]
The image forming apparatus 1 shown in FIG. 1 is an embodiment of the image forming apparatus according to the present invention, and is a color laser printer that forms an image of a plurality of colors on paper S by an electrophotographic method.

In the following description, the right side in FIG. 1 is defined as the front side of the image forming apparatus 1, the left side in FIG. 1 is defined as the rear side of the image forming apparatus 1, and the front side of the paper surface in FIG. 1 is the left side of the image forming apparatus 1, in FIG. The back side of the paper surface is defined as the right side of the image forming apparatus 1. Further, the upper side and the lower side in FIG. 1 are defined as the upper side and the lower side of the image forming apparatus 1, respectively.

The image forming apparatus 1 is provided on the apparatus main body 2, the paper feed unit 3 having the paper feed tray 10 for supporting the paper S, and the paper transport unit 30 for transporting the paper S, and the paper S conveyed by the paper feed unit 3. It includes an image forming unit 5 for forming an image.

The apparatus main body 2 is formed in a substantially rectangular parallelepiped shape, and accommodates a paper feeding unit 3 and an image forming unit 5. An opening 2A is opened on the upper surface of the apparatus main body 2, and the apparatus main body 2 has a top cover 23 capable of opening and closing the opening 2A.

The top cover 23 is configured to be rotatable around a rotation shaft 23a at the rear end, and has a closed position for closing the opening 2A and an opening by rotating around the rotation shaft 23a. It is possible to move between the open position that opens 2A. The top cover 23 of the apparatus main body 2 is formed with a paper ejection tray 23b that inclines downward from the front side to the rear side.

The paper feeding unit 3 is arranged at the lower part of the apparatus main body 2, and conveys the paper S supported by the paper feeding tray 10 to the image forming unit 5 by the paper conveying unit 30. The paper feed tray 10 is configured to be slidable in the front-rear direction, and is configured to be movable between a storage position housed in the apparatus main body 2 and a separation position pulled forward from the storage position.

The paper transport unit 30 includes a paper feed roller 32, a separation roller 33, a separation pad 33a, a transport roller pair 34, and a resist roller pair 35. In the apparatus main body 2, a transport path P for the paper S from the paper feed tray 10 to the paper output tray 23a via the image forming unit 5 is configured.

The paper S supported by the paper feed tray 10 is separated one by one by the paper feed roller 32, the separation roller 33, and the separation pad 33a, and is sent out to the transport path P. The paper feed roller 32 is a roller that conveys the paper S from the paper feed tray 10 toward the image forming unit 5. The separation roller 33 and the separation pad 33a constitute a separation means for separating the paper S supported by the paper feed tray 10 one by one.

The paper S sent out to the transport path P is transported toward the image forming unit 5 by the transport roller pair 34 and the resist roller pair 35. The resist roller pair 35 restricts the movement of the tip of the paper S to be transported and temporarily stops the paper S, and then transports the paper S toward the image forming unit 5 at a predetermined timing.

The image forming unit 5 is arranged above the paper feeding unit 3 and includes four process cartridges 50 arranged side by side in the front-rear direction. Each process cartridge 50 is provided for each of the black, yellow, magenta, and cyan colors. The process cartridge 50 is detachably attached to the apparatus main body 2. The process cartridge 50 includes a photosensitive drum 51, a developing roller 52, a supply roller 53, and a charger 54.

The process cartridge 50 is mounted on the apparatus main body 2 with the drum axis X (see FIG. 3) of the photosensitive drum 51 in a posture along the left-right direction. The left-right direction is an example of the drum axis direction. The developing roller 52 is configured to be movable between an abutting position where it comes into contact with the photosensitive drum 51 and a separating position where it is separated from the photosensitive drum 51. The supply roller 53 supplies the toner contained in the process cartridge 50 to the developing roller 52.

The apparatus main body 2 has an exposure head 59 that exposes the surface of the photosensitive drum 51. The exposure head 59 is supported by the top cover 23. Four exposure heads 59 are provided corresponding to each photosensitive drum 51, and each exposure head 59 is arranged side by side in the front-rear direction. The exposure head 59 extends downward from the top cover 23 and has an exposure portion 59a at the lower end portion. The exposure unit 59a is arranged close to the upper side of the photosensitive drum 52 in a state where the top cover 23 is closed. The exposure unit 59a is composed of an LED array including a plurality of LED elements arranged in parallel in the left-right direction.

A transfer belt 41 is arranged to face each other below the transfer path P of the photosensitive drum 51. The transfer belt 41 is hung between the drive roller 42 and the driven roller 43 arranged in front of the drive roller 42. The belt device 40 is composed of a transfer belt 41, a drive roller 42, and a driven roller 43. A transfer roller 44 is arranged at a position facing each photosensitive drum 51 sandwiching the transfer belt 41.

In the image forming unit 5, the photosensitive drum 51 uniformly charged by the charger 54 is selectively exposed by the exposure head 59, respectively. By this exposure, electric charges are selectively removed from the surface of the photosensitive drum 51, and an electrostatic latent image is formed on the surface of the photosensitive drum 51.

The toner contained in the process cartridge 50 is positively charged between the supply roller 53 and the developing roller 52, and is supported on the surface of the developing roller 52. A development bias is applied to the developing roller 52, and when the electrostatic latent image formed on the photosensitive drum 51 faces the developing roller 52, the potential difference between the electrostatic latent image and the developing roller 52 causes the developing roller 52. Toner is supplied to the electrostatic latent image. As a result, a toner image is formed on the surface of the photosensitive drum 51.

When the paper S conveyed toward the image forming unit 5 reaches the transfer belt 41, it is conveyed by the transfer belt 41 and sequentially passes between the transfer belt 41 and each photosensitive drum 51. Then, the toner image on the surface of the photosensitive drum 51 is transferred to the paper S by the transfer bias applied to the transfer roller 44 when facing the paper S.

The transfer belt 41 in the present embodiment is configured as a transport belt that conveys the paper S on which the toner image is transferred, but the toner image is transferred to the belt itself, and the toner image transferred to the belt is further transferred to the paper. It can also be configured as an intermediate transfer belt that is transferred to S.

The paper S on which the toner image is transferred is conveyed to the fixing device 60. The fixing device 60 includes a heating roller 61 and a pressure roller 62 that presses against the heating roller 61, and the paper S conveyed to the fixing device 60 passes between the heating roller 61 and the pressure roller 62. The toner image is heat-fixed.

The paper S on which the toner image is heat-fixed is conveyed downstream from the fixing device 60 in the transport direction, and is further arranged on the downstream side of the intermediate paper discharge roller pair 63 and the intermediate paper discharge roller pair 63 in the transport direction. It is conveyed by pair 64 and discharged to the output tray 23b.

As shown in FIG. 2, the apparatus main body 2 includes a first main body frame 24 and a second main body frame 25 arranged apart from each other in the left-right direction. The first main body frame 24 is located at the right end of the apparatus main body 2 and extends in the front-rear direction and the up-down direction. The second main body frame 25 is located at the left end portion of the apparatus main body 2 and extends in the front-rear direction and the up-down direction. A support frame 26 is attached to the left and right inner surfaces of the first main body frame 24, which is the side facing the second main body frame 25.

The first main body frame 24 is made of a resin member, and the weight can be reduced as compared with the case where the first main body frame 24 is made of a sheet metal member.

The process cartridge 50 is arranged between the support frame 26 and the second main body frame 25, and is detachably supported by the support frame 26 and the second main body frame 25. The support frame 26 is arranged on the right side of the process cartridge 50, which is one side of the process cartridge 50 in the drum axis X direction of the photosensitive drum 51. The second frame 25 is arranged on the left side of the process cartridge 50, which is the other side of the process cartridge 50 in the drum axis X direction of the photosensitive drum 51.

[Process cartridge]
As shown in FIGS. 3 and 4, the process cartridge 50 has a cartridge frame 55 that holds the photosensitive drum 51 and the developing roller 52. The process cartridge 50 has a protruding rib 551 and a lever 552 at the right end portion 50A in the X direction of the drum axis.

The protruding rib 551 is integrally molded with, for example, the cartridge frame 55, and protrudes to the right from the cartridge frame 55. The lever 552 is a member for moving the developing roller 52 to the contact position and the separation position. When no pressing force is applied to the lever 552, the developing roller 52 moves to the contact position and the lever 552 moves. When pressed from above, the developing roller 52 moves to a separated position.

The photosensitive drum 51 has a first bearing portion 511 at the right end portion in the X direction of the drum axis, and has a second bearing portion 512 at the left end portion in the axial direction. The first bearing portion 511 is located at the right end portion 50A of the process cartridge 50, and the second bearing portion 512 is located at the left end portion 50B of the process cartridge 50.

[Structure of the right end of the device body]
As shown in FIGS. 5 to 7, the support frame 26 has an inner side surface 26A facing the process cartridge 50 in the drum axis X direction and an inner side surface 26A facing the first main body frame 24 in the drum axis X direction. It has an outer surface 26B on the opposite side.

The inner side surface 26A of the support frame 26 has a guide surface 261 that guides the protruding rib 551 of the process cartridge 50 when the process cartridge 50 is attached to and detached from the apparatus main body 2. The protruding rib 551 of the process cartridge 50 attached to and detached from the apparatus main body 2 is guided by the guide surface 261 so that the process cartridge 50 is positioned in the left-right direction.

The inner side surface 26A of the support frame 26 has a positioning portion 262 that abuts on the first bearing portion 511 of the photosensitive drum 51 to position the photosensitive drum 51 when the process cartridge 50 is mounted on the apparatus main body 2. There is. The positioning portion 262 is configured to support the first bearing portion 511 of the process cartridge 50 mounted on the apparatus main body 2 from below.

The support frame 26 has a through hole 263 that penetrates in the left-right direction and is formed in an arc shape. The guide surface 261, the positioning portion 262, and the through hole 263 are formed at four locations along the front-rear direction, respectively, corresponding to the number of process cartridges 50 supported by the support frame 26.

The apparatus main body 2 includes an arm 71, an upper cam 72, a lower cam 73, a link arm 74, and a regulating member 80. The arm 71, the upper cam 72, the lower cam 73, the link arm 74, and the regulating member 80 are arranged between the support frame 26 and the first main body frame 24 in the X direction of the drum axis.

The arm 71 has a main body 71a, a rotating shaft portion 71b and an arm portion 71c formed on the main body 71a, and the rotating shaft portion 71b is rotatably supported by the outer surface 26B of the support frame 26. ing. In the arm 71, the main body 71a and the rotating shaft portion 71b are arranged between the support frame 26 and the first main body frame 24, and the arm portion 71c is directed from the main body 71a to the process cartridge 50 side in the drum axis X direction. Is protruding.

The arm portion 71c projects toward the process cartridge 50 from the support frame 26 through the through hole 263. The arm portion 71c rotates around the rotation shaft portion 71b along the arc shape of the through hole 263. The arm 71 can be moved to a pressing position where the arm portion 71c presses the lever 552 of the process cartridge 50 and a release position where the arm portion 71c is separated from the lever 522.

When the arm 71 moves to the pressing position, the lever 552 is pressed by the arm portion 71c, and the developing roller 52 moves to the separated position. When the arm 71 moves to the release position, the arm portion 71c separates from the lever 522, and the developing roller 52 moves to the contact position. That is, the arm 71 moves the developing roller 52 between the contact position and the separation position.

The upper cam 72 is movably supported on the outer surface 26B of the support frame 26 in the front-rear direction, and drives the arm 71 by moving in the front-rear direction. The upper cam 72 is an example of a cam that drives the arm. The arm 71 rotates according to the shape of the cam surface 72a formed on the upper cam 72 by moving the upper cam 72 in the front-rear direction.

The lower cam 73 is arranged below the upper cam 72, and is supported by the outer surface 26B of the support frame 26 so as to be movable in the front-rear direction. The link arm 74 is supported by the outer surface 26B of the support frame 26, and is configured to be rotatable around the rotation shaft portion 74a. The upper end portion 74b of the link arm 74 is connected to the upper cam 72, and the lower end portion 74c of the link arm 74 is connected to the lower cam 73.

The lower cam 73 is driven by a driving force from a drive source (not shown) included in the apparatus main body 2, and when the driven lower cam 73 moves forward, the upper cam 72 moves backward via the link arm 74. When the driven lower cam 73 moves backward, the upper cam 72 is configured to move forward via the link arm 74.

The regulating member 80 is supported by the outer surface 26B of the support frame 26. As shown in FIGS. 8 and 9, the regulating member 80 includes a main body 81, a positioning portion 82, an engaging claw 83, a first regulating portion 84, a second regulating portion 85, and a second protrusion 86. , And a plate portion 87. The main body 81 is formed of a plate-shaped member having a plate surface oriented in the X direction of the drum axis.

The positioning portion 82 is formed in a cylindrical shape protruding from the main body 81 toward the support frame 26. The positioning portion 82 has a matching hole 82a in a portion formed in a cylindrical shape. The matching hole 82a has a matching hole axis Y parallel to the drum axis X. As shown in FIG. 10, the support frame 26 has a protrusion 265 protruding from the outer surface 26B toward the regulating member 80 side.

As shown in FIG. 11, the matching hole 82a of the positioning portion 82 is aligned with the protrusion 265 of the support frame 26, and the protrusion 265 fits into the fitting hole 82a with respect to the support frame 26 of the regulating member 80. Positioning is done in the front-back direction and the up-down direction. As described above, since the regulating member 80 has the positioning portion 82, the regulating member 80 can be attached to the support frame 26 in a state of being positioned with respect to the support frame 26. Further, in the regulating member 80, the positioning portion 82 can be compactly configured by forming the positioning portion 82 in a cylindrical shape in which the matching hole 82a is formed.

As shown in FIGS. 8 and 9, the engaging claw 83 is a claw member protruding from the main body 81 toward the support frame 26. As shown in FIG. 10, the support frame 26 has an engaging portion 266 formed on the outer surface 26B. As shown in FIG. 12, the engaging claw 83 of the regulating member 80 is engaged with the engaging portion 266 of the support frame 26, and the engaging claw 83 is engaged with the engaging portion 266 of the support frame 26. The regulating member 80 is attached to the support frame 26.

As shown in FIGS. 8, 9, and 11, the first regulating unit 84 projects downward from the lower end of the positioning unit 82 and abuts on the upper end of the cam 72 to restrict the upward movement of the cam 72. .. The first regulating portion 84 has a first protrusion 84a at the lower end portion that abuts on the upper end of the cam 72, and the movement of the cam 72 upward is restricted by the first protrusion 84a contacting the cam 72. Will be done.

In the first regulating portion 84, the first protruding portion 84a that abuts on the cam 72 is projected from the positioning portion 82 that positions the regulating member 80 with respect to the support frame 26, so that the cam 72 can be moved upward with high accuracy. It is possible to regulate.

As shown in FIG. 9A, the lower end of the first protrusion 84a has an arc shape along the rotation direction R of the regulating member 80 centered on the alignment hole axis Y of the alignment hole 82a in the positioning portion 82. Have. As described above, since the lower end of the first protrusion 84a has an arc shape, even if the regulating member 80 rotates about the alignment hole axis Y, the first protrusion that abuts on the upper surface of the cam 72. It is possible to suppress the change in the vertical position of the lower end of the portion 84a, and it is possible to maintain the accuracy of restricting the upward movement of the cam 72.

As shown in FIG. 10, the support frame 26 has a protrusion 267 that protrudes toward the regulating member 80 at a position separated forward from the protrusion 265. The projecting piece 267 has one surface 267a that intersects the rotation direction R of the regulating member 80 about the alignment hole axis Y of the positioning portion 82, and another surface 267b that is opposite to the one surface 267a. In this embodiment, one surface 267a faces upward and the other surface 267b faces downward.

As shown in FIGS. 8, 9, and 13, the second restricting unit 85 includes a one-sided restricting piece 85a that projects toward the support frame 26 side and abuts on one surface 267a of the projecting piece 267, and a one-sided restricting piece 85a. It is arranged at intervals in the vertical direction, and has an other surface side restricting piece 85b that projects toward the support frame 26 side and abuts on the other surface 267b of the projecting piece 267.

When the one-sided restricting piece 85a abuts on the one-sided 267a of the protruding piece 267, the restricting member 80 is restricted from rotating in the direction in which the one-sided restricting piece 85a moves downward about the alignment hole axis Y. To. When the other surface side restricting piece 85b abuts on the other surface 267b of the protruding piece 267, the restricting member 80 rotates in the direction in which the other surface side restricting piece 85b moves upward about the alignment hole axis Y. Is regulated.

That is, when the one-side side regulation piece 85a and the other-side side regulation piece 85b of the second regulation portion 85 come into contact with the protruding piece 267 of the support frame 26, the regulation member 80 rotates about the alignment hole axis Y. This is regulated, and it is possible to maintain the posture of the regulating member 80 with respect to the support frame 26.

In the present embodiment, one surface 267a of the projecting piece 267 faces upward and the other surface 267b faces downward, but the projecting piece 267 has one surface 267a and the other surface 267b upward, respectively. It can also be formed so as to face in an inclined direction from below.

As shown in FIGS. 8 and 9, the second protrusion 86 projects from the main body 81 toward the support frame 26 side. As shown in FIGS. 10, 12, and 13, the support frame 26 has an edge portion 268 facing the second protrusion 86 in the X direction of the drum axis. The second protrusion 86 and the edge portion 268 are arranged with a slight gap in the X direction of the drum axis. The second protrusion 86 can come into contact with the edge portion 268 in the X direction of the drum axis.

Therefore, when the regulating member 80 moves toward the support frame 26 from the state where the engaging claw 83 is engaged with the engaging portion 266 and the regulating member 80 is attached to the support frame 26, the second protrusion 86 is edged. The movement of the restricting member 80 toward the support frame 26 is restricted by abutting against the portion 268. In this way, when the second protrusion 86 comes into contact with the edge portion 268 of the support frame 26, the movement of the restricting member 80 in the drum axis X direction is restricted, and the movement of the restricting member 80 with respect to the support frame 26 of the restricting member 80 is restricted in the drum axis X direction. It is possible to hold the mounting position in an appropriate position.

As shown in FIGS. 8 and 9, the plate portion 87 is formed in a plate shape extending downward from the main body 81. As shown in FIGS. 12 and 13, the plate portion 87 extends to a position overlapping the cam 72 when viewed from the drum axis X direction, and is configured to be able to come into contact with the cam 72 in the drum axis X direction. The cam 72 is located between the support frame 26 and the plate portion 87 in the X direction of the drum axis.

With such a configuration, the movement of the cam 72 supported by the support frame 26 in the drum axis X direction is restricted by the plate portion 87. As a result, when the support frame 26 in a state where the cam 72 is supported is attached to the first main body frame 24, the cam 72 can be prevented from moving in a direction away from the support frame 26 and falling, and the first support frame 26 can be prevented from falling. It is possible to improve the mountability to the main body frame 24.

Further, the restricting member 80 is located between the support frame 26 and the first main body frame 24 in the X direction of the drum axis, and the restricting member 80 is stably held in a state of being supported by the support frame 26. Is possible.

As described above, the image forming apparatus 1 is attached to the support frame 26 by engaging the engaging claw 83 with the support frame 26, and has a first regulating unit 84 that restricts the upward movement of the cam 72. It includes a member 80.

In this way, since the regulating member 80 is attached to the support frame 26 by engaging the engaging claw 83 with the support frame 26, the regulating member 80 is attached to the support frame 26 by screws, as in the case where the regulating member 80 is attached to the support frame 26. It does not require a lot of space to mount the 80. Therefore, in the image forming apparatus 1, it is possible to attach the regulating member 80 to the support frame 26, and at the same time, it is possible to reduce the size of the apparatus.

1 Image forming device 2 Device main body 24 1st main body frame 26 Support frame 50 Process cartridge 51 Photosensitive drum 52 Development roller 71 Arm 72 Cam 80 Regulator 81 Main body 82 Positioning part 82a Fitting hole 83 Engagement claw 84 1st regulation part 84a 1st protrusion 85 2nd regulation part 85a One side regulation piece 85b Other side regulation piece 86 Second protrusion 87 Plate part 265 Protrusion 267 Projection piece 267a One side 267b Other side X Drum axis Y Fitting hole axis

Claims (10)

With the main body of the device
A process cartridge having a photosensitive drum, a developing roller that can be moved to a contact position that abuts on the photosensitive drum and a separation position that is separated from the photosensitive drum, and is detachably attached to the apparatus main body. ,
The main body of the device is
A support frame arranged on the side of the process cartridge in the drum axis direction of the photosensitive drum and supporting the process cartridge, and a support frame.
An arm supported by the support frame and moving the developing roller between the contact position and the separation position,
A cam that is movably supported by the support frame and drives the arm,
It has an engaging claw that engages with the support frame and a first restricting portion that abuts on the cam and restricts the upward movement of the cam, and the engaging claw engages with the support frame. An image forming apparatus comprising a regulating member attached to the support frame. The support frame has a protrusion that protrudes toward the restricting member.
The regulating member is
It has a plate-shaped main body and a fitting hole that protrudes from the main body toward the support frame and the protrusion fits into the fitting hole. The image forming apparatus according to claim 1, further comprising a positioning unit for which positioning is performed. The image forming apparatus according to claim 2, wherein the positioning portion has a cylindrical shape in which the fitting hole is formed. The image according to any one of claims 2 or 3, wherein the first regulating portion has a first protrusion that protrudes downward from the lower end of the positioning portion and abuts on the upper surface of the cam at the lower end portion. Forming device. The image forming apparatus according to claim 4, wherein the lower end of the first protrusion has an arc shape along the rotation direction of the restricting member about the alignment hole axis of the positioning portion. The support frame is
One surface that protrudes toward the regulation member at a position away from the protrusion and intersects the rotation direction of the regulation member about the alignment hole axis of the positioning portion, and the other surface on the opposite side to the one surface. Equipped with a protruding piece,
The regulating member is
The one-sided side restricting piece that protrudes toward the support frame side and abuts on the one side of the projecting piece, and the one-sided side restricting piece are arranged at intervals in the vertical direction and project toward the support frame side. The image forming apparatus according to any one of claims 2 to 5, further comprising a second regulating portion having the other surface side regulating piece abutting on the other surface. The regulating member is
The image forming apparatus according to any one of claims 2 to 6, which has a second protrusion that protrudes from the main body toward the support frame side and can come into contact with the support frame in the direction of the drum axis. The regulating member is
It has a plate portion extending from the main body to a position overlapping the cam when viewed from the drum axis direction and being able to come into contact with the cam in the drum axis direction.
The image forming apparatus according to any one of claims 2 to 7, wherein the cam is located between the support frame and the plate portion in the direction of the drum axis. The main body of the device includes a main body frame.
The image forming apparatus according to any one of claims 1 to 8, wherein the restricting member is arranged between the support frame and the main body frame in the direction of the drum axis. The image forming apparatus according to claim 9, wherein the main body frame is made of resin.

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