JP2016090697A - Image forming apparatus and photoreceptor cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus and a photoreceptor cartridge that can press a transfer roller toward a photoreceptor drum while suppressing deformation of a door and suppressing an increase in size of a main body casing.SOLUTION: There is provided a laser printer 1 including a photoreceptor cartridge 60 that is removably attached to a main body casing 11 and includes a photoreceptor drum 61 and a transfer roller 63; and an urging member 120 that is provided in the main body casing, where the photoreceptor cartridge 60 includes a conversion member 140 that is rotatable to receive an urging force in a predetermined urging direction Y from the urging member 120 and convert the urging force to be directed from the transfer roller 63 to the photoreceptor drum 61.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an image forming apparatus and a photoreceptor cartridge that employ an electrophotographic system.

  2. Description of the Related Art Conventionally, an electrophotographic image forming apparatus has a photosensitive cartridge having a photosensitive drum, a transfer roller, a photosensitive drum and a photosensitive casing containing the transfer roller, and on the opposite side of the photosensitive drum across the transfer roller. And a main body casing having an opening for allowing the photosensitive cartridge to pass therethrough and a door for covering the opening.

  The door includes an urging member for urging the transfer roller toward the photosensitive drum when in the closed state. The biasing member is in contact with the transfer roller when the door is closed, and is positioned in the attachment / detachment path of the photosensitive member casing, and biases the transfer roller toward the photosensitive drum with a predetermined biasing force. At this time, the urging force of the urging member is transmitted to the transfer roller without changing its direction, and the transfer roller is pressed toward the photosensitive drum. In other words, the urging direction of the urging member is the same as the direction in which the transfer roller is pressed against the photosensitive drum. On the other hand, the urging member is separated from the transfer roller when the door is in an open state and is located outside the attachment / detachment path of the photosensitive member casing.

JP-A-6-161163

  However, according to such a configuration, the reaction force generated when the transfer roller presses the photosensitive drum is directly applied to the door via the biasing member. As a result, the door may be deformed. In particular, when the image forming apparatus is downsized, the door needs to be downsized and thinned. Then, the door may be further deformed.

  In order to solve this problem, the structure which arrange | positions a biasing member in a main body casing can be considered. However, according to such a configuration, the urging member is in contact with the transfer roller inside the main body casing, is separated from the transfer roller from a position located in the attachment / detachment path of the photosensitive member casing, and is attached and detached from the photosensitive member casing. It is configured to be movable between positions located outside the route. Therefore, the configuration of the main body casing and the urging member is complicated.

  Further, according to such a configuration, it becomes difficult to make the urging direction of the urging member the same as the direction in which the transfer roller is pressed against the photosensitive drum. For this reason, the transfer roller cannot be pressed toward the photosensitive drum in a predetermined direction.

  Accordingly, the present invention has been made in view of the above-described problem, and can suppress the deformation of the door and can press the transfer roller toward the photosensitive drum in a predetermined direction with a simple configuration. And a photosensitive cartridge.

  (1) To achieve the above object, an image forming apparatus of the present invention accommodates a photosensitive drum, a transfer roller pressed against the photosensitive drum in a predetermined pressing direction, the photosensitive drum, and the transfer roller. A photoconductor cartridge having a photoconductor casing, a main body casing having an opening and an urging member disposed so that the photoconductor cartridge passes through the transfer roller on the opposite side of the photoconductor drum, and a door covering the opening And. The urging member is disposed outside the attachment / detachment path of the photosensitive member cartridge. The photosensitive cartridge is configured to be rotatable around a first rotation axis along the rotation axis of the photosensitive drum, receives a biasing force in a predetermined biasing direction from the biasing member, and sets the biasing direction in the pressing direction. A conversion member for conversion is provided.

  According to such a configuration, since the urging member is not disposed on the door, the reaction force generated when the transfer roller presses the photosensitive drum is not directly transmitted to the door via the urging member. Further, since the conversion member is disposed between the transfer roller and the urging member, the urging member is provided between the inside of the main body casing and the outside of the photoconductor casing. No need to move. Further, even if the urging direction of the urging member is different from the direction in which the transfer roller is pressed against the photosensitive drum, the transfer roller can be pressed toward the photosensitive drum in a predetermined direction.

  As a result, the transfer roller can be pressed toward the photosensitive drum in a predetermined direction with a simple configuration while suppressing deformation of the door.

  (2) Moreover, the conversion member has a shaft disposed along the first rotation axis and a first portion that receives a biasing force from the biasing member, and extends from the shaft so as to approach the opening. And a second extending portion that presses the transfer roller and extends in a direction different from the first extending portion from the shaft. The first portion may be disposed outside the mounting path of the photosensitive member casing.

  According to such a configuration, when the first portion is in contact with the biasing member, the photosensitive member casing is not in contact with the biasing member. Therefore, when the photosensitive cartridge is mounted on the main body casing, the mounting resistance between the urging member and the photosensitive multi-cartridge is reduced. As a result, the user can easily mount the photoconductor cartridge.

  (3) The dimension from the shaft to the first part may be larger than the dimension from the shaft to the second part.

  According to such a configuration, the transfer roller is pressed toward the photosensitive drum as compared with the case where the dimension from the first rotation axis to the first part is smaller than the dimension from the first rotation axis to the second part. The urging force of the urging member becomes smaller. Therefore, a stable pressing force can be applied to the transfer roller with a simple configuration.

  (4) When the door covers the opening and when the door is in the closed state, the conversion member receives the urging force received from the urging member as the first urging force, and when the door is in the open state, the conversion member moves from the urging member. An interlocking member that uses a biasing force that is received as a second biasing force that is smaller than the first biasing force.

  According to such a configuration, the biasing force received by the conversion member from the biasing member is smaller when the door is positioned at the open position than when the door is positioned at the closed position. Therefore, when the user attaches or removes the photosensitive cartridge from the main body casing, the biasing force that the conversion member receives from the biasing member is reduced. As a result, the photoreceptor cartridge can be easily attached and detached from the main body casing.

  Further, the biasing force that the conversion member receives from the biasing member changes in conjunction with the opening and closing of the door. Therefore, the opening / closing operation of the door and the operation of changing the urging force received by the conversion member from the urging member can be executed in one operation. As a result, user convenience can be improved.

  (5) The door may include a main body that covers the opening of the main body casing, and a protrusion that protrudes from the main body toward the inside of the main body casing. The interlocking member includes an axis along the first rotation axis, a third portion that contacts the protrusion when the door is open, and a fourth portion that biases the biasing member in a direction opposite to the biasing direction. , And may be configured to be rotatable about an axis.

  According to such a configuration, when the door is opened, the projection of the door comes into contact with the first portion of the interlocking member. Then, the interlocking member rotates around the shaft, and the second portion of the interlocking member biases the biasing member on the side opposite to the biasing direction. As a result, there is no need to provide a sensor for detecting opening and closing of the door and a member for changing the urging force of the urging member in accordance with a signal from the sensor. That is, the urging force that the conversion member receives from the urging member can be changed with a simple configuration.

  (6) The dimension from the shaft to the third part may be larger than the dimension from the shaft to the fourth part.

  According to such a configuration, the biasing member is opposite to the biasing direction as compared with the case where the dimension from the second rotation axis to the third part is smaller than the dimension from the second rotation axis to the fourth part. The biasing force that biases in the direction increases. Therefore, the urging member can be urged in the direction opposite to the urging direction with a simple configuration.

  (7) In order to achieve the above object, a photoreceptor cartridge of the present invention includes a photosensitive drum, a transfer roller that is pressed against the photosensitive drum in a predetermined pressing direction to form a transfer nip with the photosensitive drum, A conversion member configured to be rotatable around a first rotation axis along the rotation axis of the photosensitive drum, receiving a biasing force in a predetermined biasing direction from the biasing member, and converting the biasing direction into a pressing direction; It is equipped with.

  According to such a configuration, it is possible to press the transfer roller toward the photosensitive drum while suppressing an increase in the size of the main casing while suppressing deformation of the door.

  (8) The conversion member may have a first portion that receives an urging force from the urging member and a second portion that presses the transfer roller. The dimension from the first rotation axis to the first part may be larger than the dimension from the first rotation axis to the second part.

  According to such a configuration, the transfer roller is pressed toward the photosensitive drum as compared with the case where the dimension from the first rotation axis to the first part is smaller than the dimension from the first rotation axis to the second part. Therefore, the urging force of the urging member is small. Therefore, a stable pressing force can be applied with a simple configuration.

  According to the present invention, it is possible to provide an image forming apparatus and a photosensitive member cartridge that can increase the degree of freedom of arrangement of the biasing member.

The schematic diagram of the cross section of a laser printer. FIG. 2 is an enlarged view of an attachment / detachment path for attaching / detaching a photosensitive cartridge from the main body casing of the laser printer of FIG. FIG. 5 is an explanatory diagram for explaining a state in which a photosensitive cartridge is attached to a main body casing. FIG. 4 is a schematic cross-sectional view of the photoconductor cartridge, the biasing member, and the interlocking member of FIG. 3. The perspective view of a photoconductor cartridge. Explanatory drawing for demonstrating the state after mounting | wearing a main body casing with a photoconductor cartridge, and closing a door.

<Embodiment 1>
Embodiment 1 of the present invention will be described in detail with reference to the drawings as appropriate.

1. First, the overall configuration of the laser printer 1 will be described with reference to FIG. The laser printer 1 includes a main body 10, a paper feeding unit 20 for feeding paper, an image forming unit 30 for forming an image on paper fed by the paper feeding unit 20, and an image forming unit 30. A paper discharge unit 40 for discharging the paper on which the image is formed to the outside of the main body 10.

  The main body 10 accommodates a paper feed unit 20, an image forming unit 30, and a paper discharge unit 40. The paper feed unit 20 includes a paper feed cassette 21 for storing paper and a paper feed roller 22 for transporting paper picked up from the paper feed cassette 21 toward the image forming unit 30.

  The image forming unit 30 includes an exposure device 50, a photosensitive cartridge 60, a developing cartridge 70, and a fixing device 80. The exposure device 50 forms an electrostatic latent image on the outer peripheral surface of the photosensitive drum 61. The photosensitive cartridge 60 transfers a photosensitive drum 61, a charger 62 for uniformly charging the outer peripheral surface of the photosensitive drum 61, and a developer image carried on the outer peripheral surface of the photosensitive drum 61 onto a sheet. A transfer roller 63. The transfer roller 63 is in contact with the photosensitive drum 61 to form a transfer nip N1.

  The developing cartridge 70 is disposed on the rear side of the photoreceptor cartridge 60 and includes a developing roller 71 and a supply roller 72. The fixing device 80 includes a heating roller 81 having a heater therein, and a pressure roller 82 that contacts the heating roller 81 to form the fixing nip N2.

  The paper discharge unit 40 is configured to discharge the paper conveyed from the fixing device 80 to the outside of the main body 10.

2. Configuration of Main Body 10 Next, the configuration of the main body 10 will be described with reference to FIGS. 2 and 3.

  As shown in FIG. 2, the main body 10 includes a main body casing 11 and a door 12. The main body casing 11 has an opening A for allowing the photosensitive cartridge 60 to pass therethrough, and includes a guide 100, a positioning spring 110, a biasing member 120, and an interlocking member 130.

  The guide 100 is provided to guide the photosensitive cartridge 60 into the main body casing 11 and extends from the opening A to the inner side of the main body casing 11. The guide 100 includes a guide portion 101 that engages with the drum shaft 61 a of the photosensitive drum 61 and a positioning portion 102 that positions the photosensitive cartridge 60 inside the main body casing 11.

  The positioning spring 110 is a torsion coil spring, and is disposed on the upstream side of the positioning portion 102 in the mounting direction X of the photoreceptor cartridge 60, and includes a bent portion 111 and a pressing portion 112. The bent portion 111 is pushed upward by contacting the drum shaft 61 a of the photosensitive drum 61. Then, the drum shaft 61 a of the photosensitive drum 61 passes below the bent portion 111 and reaches the positioning portion 102 of the guide 100.

  The pressing portion 112 is disposed downstream of the bent portion 111 in the mounting direction X of the photosensitive cartridge 60 and presses the drum shaft 61 a of the photosensitive drum 61 toward the positioning portion 102 of the guide 100. Then, the photosensitive member cartridge 60 is positioned inside the main body casing 11.

  As shown in FIG. 3, the urging member 120 is provided in the main body casing 11 and is disposed below the photoconductor cartridge 60 when the photoconductor cartridge 60 is positioned inside the main body casing 11. The urging member 120 is a compression coil spring, and the urging direction Y of the urging member 120 is a direction from the lower side to the upper side. In other words, the urging direction Y of the urging member 120 is a direction orthogonal to the mounting direction X of the photoconductor cartridge 60.

  The interlocking member 130 is provided in the main casing 11 and is configured to be rotatable along the rotational axis of the photosensitive drum 61. The interlocking member 130 is formed in a substantially S shape, and when the door 12 is in the closed position, the urging force that the conversion member 140 receives from the urging member 120 is the first urging force, and the door 12 is in the open position. Sometimes, the biasing force that the conversion member 140 receives from the biasing member 120 is a second biasing force that is smaller than the first biasing force. The interlocking member 130 has a shaft 131 disposed along the rotational axis of the photosensitive drum 61, a third extending portion 132 that comes into contact with the door 12, and a fourth extension that comes into contact with the biasing member 120 and the conversion member 140. And an output part 133.

  The third extending portion 132 includes a third portion 132a that extends from the shaft 131 toward the opening A and contacts the protrusion 14 of the door 12 when the door 12 is in the open position. The fourth extending portion 133 extends from the shaft 131 in a direction different from that of the third portion 132. In other words, the fourth portion 133 extends to the opposite side of the opening A across the shaft 131. The fourth portion 133 is disposed on the opposite side of the urging member 120 with the fourth portion 133a in contact with the urging member 120, and is in contact with the conversion member 140 of the photoreceptor cartridge 60. And a fifth portion 133b. The dimension from the shaft 131 to the fourth portion 133a is smaller than the dimension from the shaft 131 to the third portion 132a.

  The door 12 is configured to be rotatable so as to open and close an opening A formed in the main body casing 11, and includes a main body portion 13 and a protrusion 14. The main body 13 is configured to cover the opening A, and extends in the mounting direction X of the photosensitive cartridge 60 when the door 12 is located at the open position.

  The protrusion 14 is configured to come into contact with the third portion 132 of the interlocking member 130 when the door 12 is in the open position, and extends in a direction orthogonal to the mounting direction X of the photoreceptor cartridge 60. In other words, the protrusion 14 extends in a direction orthogonal to the direction in which the main body 13 extends when the door 12 is located at the open position.

2. Configuration of Photoreceptor Cartridge 60 Next, the configuration of the photoreceptor cartridge 60 will be described with reference to FIGS. 4 and 5.

  As shown in FIG. 4, the photosensitive cartridge 60 includes a photosensitive drum 61, a charger 62, and a transfer roller 63. The photosensitive drum 61 includes a shaft 61a and a photosensitive layer 61b. The transfer roller 63 includes a shaft 63a, a rubber layer 63b disposed so as to cover the shaft 63a, and bearings 63c disposed at both ends of the shaft 63a.

  The photoconductor cartridge 60 further includes a photoconductor casing 140, a conversion member 150, and a rotation stopper 160. The photosensitive member casing 140 accommodates the photosensitive drum 61, the charger 62, and the transfer roller 63.

  The conversion member 150 is configured to be rotatable around a rotation axis along the rotation axis of the photosensitive drum 61, receives a biasing force in a predetermined biasing direction Y from the biasing member 120, and biasing direction Y of the biasing force. In the pressing direction in which the toner is pressed from the transfer roller 63 toward the photosensitive drum 61. The conversion member 150 is a substantially U-shaped resin plate, and includes a shaft 151 disposed along the rotation axis of the photosensitive drum 61, a first extension portion 152, and a second extension portion 153. I have.

  The first extension portion 152 includes a first portion 152 a that extends from the shaft 151 toward the biasing member 120 and contacts the second portion 133 of the interlocking member 130. The second extending portion 153 includes a second portion 153 a that extends from the shaft 151 in a direction different from that of the first extending portion 152 and contacts the transfer roller 63, and a third portion 153 b that contacts the rotation stopper 160. ing.

  The second portion 153a contacts the bearing 63c of the transfer roller 63 when the photosensitive cartridge 60 is mounted inside the main body casing 11 and the door 12 is closed. That is, the second portion 153a comes into contact with the bearing 63c of the transfer roller 63 when the biasing force received by the conversion member 140 from the biasing member 120 is the first biasing force. On the other hand, the second portion 153a is separated from the bearing 63c of the transfer roller 63 when the door 12 is opened. That is, the second portion 153a is separated from the bearing 63c of the transfer roller 63 when the biasing force received by the conversion member 140 from the biasing member 120 is the second biasing force. The dimension from the shaft 151 to the first portion 152a is larger than the dimension from the shaft 151 to the second portion 153a.

  The third portion 153 b is separated from the rotation stopper 160 when the photosensitive cartridge 60 is mounted inside the main body casing 11 and the door 12 is closed. That is, the third portion 153b is separated from the rotation stopper 160 when the urging force received by the conversion member 140 from the urging member 120 is the first urging force. On the other hand, the third portion 153b contacts the rotation stopper 160 when the door 12 is opened. That is, the third portion 153b comes into contact with the rotation stop 160 when the urging force that the conversion member 140 receives from the urging member 120 is the second urging force. Therefore, the conversion member 150 is positioned at a predetermined position by the rotation stopper 160 when the photosensitive member cartridge 60 is attached to and detached from the main body casing 11.

  Further, as shown in FIG. 5, the photosensitive member casing 140 includes a first support wall 141 and a second support wall 142. The first support wall 141 is disposed at the end of the photosensitive cartridge 60 in the rotation axis direction of the photosensitive drum 61 and supports the shaft 61 a of the photosensitive drum 61 through the first supporting wall 141.

  The second support wall 142 is disposed on the inner side of the first support wall 141 in the rotation axis direction of the photosensitive drum 61 and spaced from the first support wall 141. The second support wall 142 supports the bearing 63 c of the transfer roller 63 and the conversion member 150. At this time, a part of the bearing 63 c of the transfer roller 63 is disposed at a distance between the first support wall 141 and the second support wall 142. Therefore, a part of the bearing 63c of the transfer roller 63 is exposed to the outside of the photosensitive member casing 140. In addition, the conversion member 150 is disposed at a distance between the first support wall 141 and the second support wall 142. Further, the dimension of the conversion member 150 in the rotation axis direction of the photosensitive drum 61 is smaller than the interval between the first support wall 141 and the second support wall 142.

  The rotation stopper 160 protrudes from the second support wall 142 toward the outer side in the rotation axis direction of the photosensitive drum 61 and is disposed between the first portion 152 and the second portion 153 of the conversion member 150.

4). Mounting of Photoreceptor Cartridge 60 Next, with reference to FIGS. 2, 3 and 6, the process of mounting the photoreceptor cartridge 60 on the main casing 11 will be described.

  First, before the photoconductor cartridge 60 is mounted on the main casing 11, the door 12 is positioned at an open position where the opening A is opened as shown in FIG. 2. At this time, the protrusion 14 of the door 12 contacts the first portion 132 of the interlocking member 130. Therefore, the first portion 132 of the interlocking member 130 is pushed upward by the protrusion 14 and rotates around the shaft 131 in the counterclockwise direction. At this time, the second portion 133 of the interlocking member 130 presses the urging member 120 downward. In other words, the second portion 133 of the interlocking member 130 presses the biasing member 120 in the direction opposite to the biasing direction Y of the biasing member 120. Therefore, the biasing force that the conversion member 140 receives from the biasing member 120 is set to the second biasing force.

  In this state, as shown in FIG. 3, the photoconductor casing 60 passes through the opening A and is mounted inside the main body casing 11. Specifically, first, the shaft 61 a of the photosensitive drum 61 is fitted into the guide portion 101 of the guide 100. Thereafter, the shaft 61 a of the photosensitive drum 61 is moved rearward toward the positioning spring 110 and comes into contact with the positioning spring 110. Further, thereafter, the shaft 61 a of the photosensitive drum 61 is pushed into the main body casing 11 by pushing up the positioning spring 110 and passing below the positioning spring 110. Then, the shaft 61 a of the photosensitive drum 61 comes into contact with the positioning portion 102 of the guide 100.

  At this time, the fourth extending portion 133 of the interlocking member 130 is in contact with the first extending portion 142 of the conversion member 140. Therefore, the photoconductor cartridge 60 is stably positioned inside the main body casing 11. On the other hand, the second extending portion 143 of the conversion member 140 is separated from the bearing 63 c of the transfer roller 63. Therefore, the transfer roller 63 is not pressed against the photosensitive drum 61 with a predetermined pressing force.

  Thereafter, the door 12 is located at the closed position as shown in FIG. Then, the protrusion 14 of the door 12 moves away from the first portion 132 of the interlocking member 130. Therefore, the interlocking member 130 rotates around the shaft 131 in the clockwise direction. Then, the fourth extension part 133 of the interlocking member 130 presses the first extension part 152 of the conversion member 150. Therefore, the biasing force that the conversion member 140 receives from the biasing member 120 changes from the second biasing force to the first biasing force. As a result, the transfer roller 63 is pressed against the photosensitive drum 61 with a predetermined pressing force.

5). Effects of First Embodiment (1) The conversion member 150 is configured to be rotatable around an axis 151 along the rotation axis of the photosensitive drum 61.

  According to such a configuration, since the urging member 120 is not disposed on the door 12, the reaction force generated when the transfer roller 63 presses the photosensitive drum 61 is directly applied to the door 12 via the urging member 120. I don't get it. Further, since the conversion member 140 is disposed between the transfer roller 63 and the urging member 120, the urging member 120 is disposed inside the main body casing 11 in the mounting path of the photoconductor cartridge 60 and the photoconductor cartridge 60. There is no need to move between outside the mounting path. Further, even if the urging direction of the urging member is different from the direction in which the transfer roller is pressed against the photosensitive drum, the transfer roller can be pressed toward the photosensitive drum in a predetermined direction.

  As a result, the transfer roller can be pressed toward the photosensitive drum in a predetermined direction with a simple configuration while suppressing deformation of the door.

  (2) The first portion 152 a is disposed outside the mounting path of the photoconductor casing 60.

  According to such a configuration, the photosensitive member casing 60 does not contact the urging member 120 when the first portion 152 a contacts the urging member 120. Therefore, when the photosensitive cartridge is mounted on the main casing, the mounting resistance between the urging member and the photosensitive multi-cartridge becomes small. As a result, the user can easily mount the photoconductor cartridge.

  (3) The dimension from the shaft 151 to the first portion 152a is larger than the dimension from the shaft 151 to the second portion 153a.

  According to such a configuration, the transfer roller 63 is pressed toward the photosensitive drum 61 as compared with the case where the dimension from the roller 151 to the first part 152a is smaller than the dimension from the shaft 151 to the second part 153a. The urging force of the urging member 120 becomes smaller. Therefore, a stable pressing force can be applied to the transfer roller 63 with a simple configuration.

  (4) When the door 12 is in the closed state, the interlocking member 130 uses the urging force that the conversion member 140 receives from the urging member 120 as the first urging force, and when the door 12 is in the open state, the conversion member 140 is The biasing force received from the biasing member 120 is a second biasing force that is smaller than the first biasing force.

  According to such a configuration, the biasing force received by the conversion member 140 from the biasing member 120 is smaller when the door 12 is positioned at the open position than when the door is positioned at the closed position. Therefore, when the user attaches / detaches the photoconductor cartridge 60 to / from the main body casing 11, the biasing force that the conversion member 140 receives from the biasing member 120 becomes small. As a result, the photoconductor cartridge 60 can be easily detached from the main body casing 11.

  Further, the urging force of the urging member 120 changes in conjunction with opening and closing of the door 12. Therefore, the opening / closing operation of the door 12 and the operation of changing the urging force received by the conversion member 140 from the urging member 120 can be executed in one operation. As a result, user convenience is improved.

  (5) The interlocking member 130 is configured to be rotatable around the shaft 131, and in a direction opposite to the biasing direction Y, the third portion 132a that contacts the protrusion 14 of the door 12 when the door 12 is in the open state. And a fourth portion 133a for urging the urging member 120.

  According to such a configuration, when the door 12 is opened, the protrusion 14 of the door 12 comes into contact with the third portion 132 a of the interlocking member 130. Then, the interlocking member 130 rotates around the shaft 131, and the fourth portion 133a of the interlocking member 130 biases the biasing member 120 on the side opposite to the biasing direction Y. As a result, there is no need to provide a sensor for detecting the opening / closing of the door 12 or a member for changing the urging force received by the conversion member 140 from the urging member 120 in accordance with a signal from the sensor. That is, the urging force that the conversion member 140 receives from the urging member 120 can be changed with a simple configuration.

  (6) The dimension from the shaft 131 of the interlocking member 130 to the third portion 132a of the interlocking member 130 is larger than the dimension from the shaft 131 of the interlocking member 130 to the fourth portion 133a of the interlocking member 130.

  According to such a configuration, the biasing member 120 is opposite to the biasing direction Y as compared with the case where the dimension from the shaft 131 to the third portion 132a is smaller than the dimension from the shaft 131 to the fourth portion 133a. The biasing force that biases in the direction increases. Therefore, the urging member 120 can be urged in the direction opposite to the urging direction Y with a simple configuration.

<Modification>
In the present embodiment, the interlocking member 130 has a substantially S shape. However, the present invention is not limited to this. For example, the interlocking member 130 may be configured in a flat plate shape.

  Moreover, in this embodiment, the conversion member 140 was comprised by the substantially U shape. However, the present invention is not limited to this. For example, the conversion member 140 may be configured in an elliptical shape or an L shape.

  In the present embodiment, the urging member 120 is in contact with the conversion member 140 via the interlocking member 130. However, the present invention is not limited to this. For example, the biasing member 120 may be in direct contact with the conversion member 140.

  In the present embodiment, the photosensitive cartridge 60 includes the photosensitive drum 61 and the transfer roller 63. However, the present invention is not limited to this. For example, the photoreceptor cartridge 60 may include a developing roller 71 and a supply roller 72. That is, the photoreceptor cartridge 60 may be configured integrally with the developing cartridge 70.

DESCRIPTION OF SYMBOLS 1 Laser printer 10 Main body 11 Main body casing 12 Door 13 Main body 14 Protrusion 60 Process cartridge 60 Photoconductor cartridge 61 Photosensitive drum 61a Shaft 61b Photosensitive layer 63 Transfer roller 63a Shaft 63b Rubber layer 63c Bearing 120 Energizing member 130 Interlocking member 140 Photosensitive member casing 150 Conversion member X Mounting direction Y Biasing direction

Claims (8)

A photosensitive cartridge having a photosensitive drum, a transfer roller pressed against the photosensitive drum in a predetermined pressing direction, and a photosensitive casing housing the photosensitive drum and the transfer roller, and the transfer roller sandwiched between the photosensitive drum and the photosensitive drum. An image forming apparatus comprising: a main body casing having an opening and an urging member disposed on a side opposite to the photosensitive drum; and a door covering the opening,
The biasing member is disposed outside the attachment / detachment path of the photosensitive member casing,
The photoconductor cartridge is configured to be rotatable around a first rotation axis along the rotation axis of the photosensitive drum, receives a biasing force in a predetermined biasing direction from the biasing member, and sets the biasing direction to the biasing direction. An image forming apparatus comprising a conversion member for converting in a pressing direction. The conversion member has a shaft disposed along the first rotation axis and a first portion that receives a biasing force from the biasing member, and extends from the shaft so as to approach the opening. And a second extending portion that presses the transfer roller, and extends from the shaft in a direction different from the first extending portion, and
The image forming apparatus according to claim 1, wherein the first portion is disposed outside a mounting path of the photosensitive member casing.   The image forming apparatus according to claim 1, wherein a dimension from the shaft to the first part is larger than a dimension from the axis to the second part. A door covering the opening;
The biasing force received by the conversion member from the biasing member when the door is in the closed state is a first biasing force, and the biasing force received by the conversion member from the biasing member when the door is in the open state. 4. The image forming apparatus according to claim 1, further comprising: an interlocking member that sets a second biasing force smaller than the first biasing force. 5. The door includes a main body that covers the opening of the main casing, and a protrusion that protrudes from the main body toward the inside of the main casing.
The interlocking member is
An axis along the first rotation axis;
A third portion that contacts the protrusion when the door is open;
A fourth portion for urging the urging member in a direction opposite to the urging direction,
The image forming apparatus according to claim 4, wherein the image forming apparatus is configured to be rotatable around the axis.   The image forming apparatus according to claim 5, wherein a dimension from the shaft to the third portion is larger than a dimension from the shaft to the fourth portion. A photosensitive cartridge configured to be detachable from an image forming apparatus including a main body casing having an opening and a biasing member,
A photosensitive drum;
A transfer roller that is pressed against the photosensitive drum in a predetermined pressing direction to form a transfer nip with the photosensitive drum;
A photoreceptor casing that houses the photosensitive drum and the transfer roller;
For rotating around a first rotation axis along the rotation axis of the photosensitive drum, receiving a biasing force in a predetermined biasing direction from the biasing member, and converting the biasing direction into the pressing direction. A photosensitive member cartridge. The conversion member includes a first portion having a first portion that receives a biasing force from the biasing member, and a second portion having a second portion that presses the transfer roller,
The dimension from the first rotation axis to the first part of the first part is larger than a dimension from the first rotation axis to the second part of the second part. The photosensitive member cartridge according to 1.