JP6136373B2 - Developer cartridge - Google Patents

Description

  The present invention relates to a developing cartridge for use in an image forming apparatus employing an electrophotographic system.

  A conventional electrophotographic image forming apparatus includes a developing cartridge having a developing roller and a process cartridge including a drum cartridge having a photosensitive drum. The process cartridge is configured to be attached to or detached from the apparatus main body (see, for example, Patent Document 1 below).

  The developing cartridge of the process cartridge includes an input gear that receives a driving force from the main body casing, and a supply roller driving gear that is disposed below the input gear and meshes with the input gear.

JP 2006-72284 A

  In the developing cartridge described above, the input gear is arranged side by side with the supply roller driving gear in the vertical direction, and it is difficult to further reduce the size of the developing cartridge.

  An object of the present invention is to provide a developing cartridge that can be miniaturized.

(1) In order to achieve the above object, the developing cartridge of the present invention is configured to transmit a supply roller having a first axis extending in the first direction and a driving force supplied from the outside to the supply roller. Coupling.

  The coupling is configured to rotate in the direction opposite to the supply roller, with the first axis of the supply roller as the center of rotation.

  According to such a configuration, the coupling is arranged at a position where the center of rotation overlaps the first axis of the supply roller.

Therefore, the development cartridge can be reduced in size.
(2) The developing cartridge of the present invention may include a transmission mechanism configured to transmit the driving force received by the coupling to the supply roller.

According to such a configuration, the driving force received by the coupling can be reliably transmitted to the supply roller by the transmission mechanism.
(3) The transmission mechanism is disposed on the first axis, and is configured to transmit the driving force received by the coupling to the supply roller, and the driving force received by the coupling from the coupling. You may provide the 2nd transmission part comprised so that it might transmit to a 1st transmission part.

According to such a configuration, the driving force received by the coupling can be transmitted to the supply roller via the second transmission unit and the first transmission unit in order with a simple configuration.
(4) The second transmission unit may include a third transmission unit that contacts the coupling, and a fourth transmission unit that contacts the third transmission unit and the first transmission unit.

According to such a configuration, the driving force received by the coupling can be transmitted to the first transmission unit via the third transmission unit and the fourth transmission unit sequentially with a simple configuration.
(5) The second transmission unit may include a third transmission unit that contacts the coupling and the first transmission unit.

According to such a configuration, the driving force received by the coupling can be transmitted to the first transmission unit via the third transmission unit with a simple configuration.
(6) The developing cartridge of the present invention may include a first wall and a second wall positioned at a distance from the first wall in the first direction. In this case, the coupling, the first transmission unit, and the second transmission unit may be disposed on the first wall.

  According to such a structure, a coupling, a 1st transmission part, and a 2nd transmission part can be concentrated on a 1st wall.

  Therefore, a configuration for transmitting the driving force from the coupling to the supply roller can be disposed on the first wall, and another configuration can be provided on the second wall.

As a result, the second wall can be used more effectively.
(7) The developing cartridge of the present invention may include a first wall and a second wall located at a distance from the first wall in the first direction. In this case, the coupling may be disposed on the first wall, and the first transmission unit may be disposed on the second wall.

  According to such a structure, compared with the structure which arrange | positions a coupling and a 1st transmission part in any one of a 1st wall or a 2nd wall, reducing the area of a 1st wall and a 2nd wall. Can do.

As a result, the developing cartridge can be reduced in size.
(8) The supply roller may have a shaft extending along the first axis. The developing cartridge of the present invention may further include a support member that supports the shaft of the supply roller. In this case, the support member may include a support portion that supports the coupling.

  According to such a structure, a coupling can be supported using the supporting member which supports the shaft of a supply roller.

Therefore, the number of parts can be reduced as compared with the case where the coupling is supported by a member other than the shaft and the support member.
(9) The supply roller may have a shaft extending along the first axis. In this case, the coupling may be supported on the shaft of the supply roller so as to be relatively rotatable.

  According to such a structure, a coupling can be supported using the shaft of a supply roller.

As a result, the driving force received by the coupling can be reliably transmitted to the supply roller.
(10) The coupling may include a first end portion in the first direction and a concave portion that is recessed from the first end portion in a direction opposite to the first direction.

  According to such a structure, it can suppress that a coupling breaks compared with the case where the coupling has the part which protrudes.

  According to the developing cartridge of the present invention, the size can be reduced.

FIG. 1 is a central sectional view of a developing cartridge to which the first embodiment of the present invention is applied. FIG. 2 is a central cross-sectional view showing a form of a printer in which the developing cartridge according to the first embodiment of the present invention is mounted. FIG. 3 is a plan view of the developing cartridge shown in FIG. FIG. 4 is a perspective view of the first frame of the developing cartridge shown in FIG. 2 as viewed from the lower left. FIG. 5 is a perspective view of the developing cartridge driving unit shown in FIG. 2 as viewed from the upper left. FIG. 6 shows the drive unit shown in FIG. 5 with the developing cartridge cover removed. FIG. 7 is a left side view of the driving unit shown in FIG. FIG. 8 is an exploded perspective view of the drive unit shown in FIG. FIG. 9 is an explanatory view for explaining the meshing state between the gear portion of the developing coupling of the developing cartridge shown in FIG. 6 and the developing gear. FIG. 10 is a perspective view of the developing cartridge shown in FIG. 2 as viewed from the right front. FIG. 11 is an exploded perspective view of the power receiving unit of the developing cartridge shown in FIG. FIG. 12 shows the power receiving unit shown in FIG. 9 with the developing cartridge cover removed. FIG. 13 is a right side view of the power receiving unit shown in FIG. 11. 14 is a cross-sectional view of the developing cartridge shown in FIG. FIG. 15A is an explanatory diagram for explaining the interlocking between the handle member and the left linear cam, and shows a state in which the protrusion is in contact with the left linear cam while the handle member moves from the extended position to the tilted position. It is explanatory drawing shown. FIG. 15B is an explanatory diagram illustrating the interlocking between the handle member and the left linear cam, and is an explanatory diagram illustrating a state where the handle member is positioned at the tilted position and the left linear cam is positioned at the pressing position. FIG. 16A is an explanatory diagram for explaining the interlocking between the handle member and the right translation cam, and shows a state in which the protrusion is in contact with the right translation cam while the handle member moves from the extended position to the tilt position. It is explanatory drawing shown. FIG. 16B is an explanatory diagram illustrating the interlocking between the handle member and the right linear cam, and is an explanatory diagram illustrating a state in which the handle member is positioned at the tilt position and the right linear cam is positioned at the pressing release position. . FIG. 17 is a perspective view of the drive unit shown in FIG. 15B as viewed from the upper left. FIG. 18 is a perspective view of the power reception unit illustrated in FIG. 16B as viewed from the upper right. FIG. 19 is a cross-sectional view taken along line AA of FIG. 2 showing a state where the development coupling is located at the outward position and the development electrode is located at the outward position. FIG. 20A is an explanatory diagram for explaining the interlocking between the handle member and the left translation cam, and the protrusion is a second engagement portion of the left translation cam while the handle member moves from the tilted position to the extended position. It is explanatory drawing which shows the state contact | abutted to the vertical part. FIG. 20B is an explanatory diagram for explaining the interlocking between the handle member and the left linear cam, and the protrusion is a second engaging portion of the left linear cam while the handle member moves from the tilted position to the extended position. It is explanatory drawing which shows the state contact | abutted to the inclination part. FIG. 20C is an explanatory diagram illustrating the interlocking between the handle member and the left linear cam, and is an explanatory diagram illustrating a state in which the handle member is positioned at the extended position and the left linear cam is positioned at the pressing release position. is there. FIG. 21A is an explanatory view for explaining the interlocking between the handle member and the right translation cam, and the projection is a second engagement portion of the right translation cam in the middle of the movement of the handle member from the tilted position to the extended position. It is explanatory drawing which shows the state contact | abutted to. FIG. 21B is an explanatory diagram illustrating the interlocking between the handle member and the right linear cam, and is an explanatory diagram illustrating a state in which the handle member is located at the extended position and the right linear cam is located at the pressing position. . FIG. 22A is an explanatory view illustrating the right link mechanism of the developing cartridge according to the second embodiment of the present invention, and shows a state where the right link mechanism is located at the first position and the developing electrode is located at the inward position. It is explanatory drawing. FIG. 22B is an explanatory view illustrating the right link mechanism of the developing cartridge according to the second embodiment of the present invention, and shows a state in which the right link mechanism is located at the second position and the developing electrode is located at the outward position. It is explanatory drawing. FIG. 23A is an explanatory view illustrating the left link mechanism of the developing cartridge according to the second embodiment of the present invention, in which the left link mechanism is located at the third position and the developing coupling is located at the inward position. It is explanatory drawing shown. FIG. 23B is an explanatory diagram for explaining the left link mechanism of the developing cartridge according to the second embodiment of the present invention, in which the left link mechanism is located at the fourth position and the developing coupling is located at the outward position. It is explanatory drawing shown. FIG. 24 is an exploded view of the left link mechanism. FIG. 25 is a perspective view showing the driving unit of the developing cartridge according to the third embodiment of the present invention, viewed from the upper right. 26 is an exploded perspective view of the drive unit shown in FIG. FIG. 27A is an explanatory view for explaining the interlocking between the handle member and the left interlocking mechanism of the developing cartridge according to the third embodiment of the present invention, in which the handle member is located at the extended position and the cam member is located at the pressing position. It is explanatory drawing which shows the state which carried out. FIG. 27B is an explanatory diagram for explaining the interlocking between the handle member and the left interlocking mechanism of the developing cartridge according to the third embodiment of the present invention, in which the handle member is positioned at the tilt position and the cam member is positioned at the press release position. It is explanatory drawing which shows the state which carried out. FIG. 28 is a perspective view of the drive unit shown in FIG. 27B as viewed from the upper right. 29 is a cross-sectional view of the drive unit shown in FIG. 27B taken along line BB. FIG. 30 is an explanatory diagram for explaining transmission of driving force from the development coupling to the supply gear. FIG. 31 is an explanatory diagram for describing a modification of the drive unit according to the third embodiment of the present invention. FIG. 32 is an explanatory diagram for explaining a developing cartridge according to a fourth embodiment of the present invention. FIG. 33 is an exploded perspective view of the gear train shown in FIG. FIG. 34 is an explanatory diagram for explaining the coupling support member shown in FIG. 33. FIG. 35A is a perspective view of a developing cartridge driving unit according to the fifth embodiment of the present invention as viewed from the left front side. FIG. 35B is a perspective view seen from the front lower side of the drive unit with the cover removed from the drive unit of FIG. 35A. 36 is a left side view of the driving unit shown in FIG. 35B. FIG. 37A is a cross-sectional view taken along the line C-C of the drive unit shown in FIG. 36, and shows a state where the development coupling and the development electrode are arranged at the inward position. FIG. 37B is a cross-sectional view taken along the line CC of the drive unit shown in FIG. 36, and shows a state in which the development coupling and the development electrode are disposed at the outer position. FIG. 38 is a perspective view of the cover shown in FIG. 35A as viewed from the lower right. FIG. 39A is an explanatory diagram for explaining the development coupling and the movement of the development electrode in the development cartridge according to the fifth embodiment of the present invention, in the middle of the movement of the handle member from the tilted position to the extended position. It is explanatory drawing which shows the state which contact | abutted to the connection part of the linear cam. FIG. 39B is an explanatory diagram for explaining the development coupling and the movement of the development electrode in the development cartridge according to the fifth embodiment of the present invention in the state shown in FIG. 39A. It is explanatory drawing which shows a mode that the coupling moved to the left slightly. FIG. 40A is an explanatory diagram for explaining the development coupling and the movement of the development electrode in the development cartridge according to the fifth embodiment of the present invention, in which the protrusion hits the inclined portion of the second engagement portion of the linear motion cam. It is explanatory drawing which shows the state which contact | connected. FIG. 40B is an explanatory diagram for explaining the development coupling and the movement of the development electrode in the development cartridge according to the fifth embodiment of the present invention in the state shown in FIG. 40A. It is explanatory drawing which shows a mode that it moved to. FIG. 41A is an explanatory diagram for explaining the development coupling and the movement of the development electrode in the development cartridge according to the fifth embodiment of the present invention, in which the handle member is in the tilted position and the linear cam is in the pressing position. It is explanatory drawing which shows the state located. FIG. 41B is an explanatory diagram for explaining the development coupling and the movement of the development electrode in the development cartridge according to the fifth embodiment of the present invention. In the state shown in FIG. 41A, the development coupling and the development electrode are outward. It is explanatory drawing which shows a mode that it located in the position. FIG. 42A is a perspective view of the driving portion of the developing cartridge according to the sixth embodiment of the present invention as viewed from the left front side. FIG. 42B is a perspective view showing a state where the cover of the developing cartridge according to the sixth embodiment of the present invention shown in FIG. 42A is removed. FIG. 43A is an explanatory diagram for explaining the movement of the left linear cam shown in FIG. 42B, and shows a state in which the left linear cam is located at the pressing release position and the regulating member is located at the regulation releasing position. is there. FIG. 43B is an explanatory diagram for explaining the movement of the left linear cam shown in FIG. 42B and is a diagram illustrating a state in which the left linear cam is located at the pressing position and the regulating member is located at the regulation releasing position. . FIG. 43C is an explanatory diagram for explaining the movement of the left linear cam shown in FIG. 42B, and is a diagram illustrating a state in which the left linear cam is located at the pressing position and the regulating member is located at the regulating position. FIG. 44 is a perspective view of the developing cartridge according to the seventh embodiment viewed from the left front. FIG. 45 is an exploded perspective view of the drive unit shown in FIG. 46A is an explanatory diagram for explaining the movement of the engaging shaft of the developing cartridge shown in FIG. 45, and is an explanatory diagram showing a state in which the engaging shaft is located at the disengagement position. FIG. 46B is an explanatory diagram for explaining the movement of the engagement shaft of the developing cartridge shown in FIG. 45 and is a diagram for illustrating a state in which the engagement shaft is located at the engagement position. FIG. 47A is a cross-sectional view taken along the line DD of the drive unit illustrated in FIG. 44 and is an explanatory diagram illustrating a state where the engagement shaft is located at the engagement release position. 47B is a cross-sectional view taken along the line DD of the drive unit illustrated in FIG. 44 and is an explanatory diagram illustrating a state where the engagement shaft is located at the engagement position. FIG. 48A is an explanatory view for explaining the mounting of the developing cartridge to the main casing with the handle member disposed at the extended position in the developing cartridge according to the seventh embodiment of the present invention. It is explanatory drawing which shows the state arrange | positioned ahead. FIG. 48B is an explanatory view for explaining the mounting of the developing cartridge to the main casing with the handle member disposed at the extended position in the developing cartridge of the seventh embodiment of the present invention. It is explanatory drawing which shows the state by which it inserted in and the engagement shaft has been arrange | positioned in the guide groove. FIG. 48C is an explanatory view for explaining the mounting of the developing cartridge to the main casing of the developing cartridge with the handle member disposed at the extended position in the developing cartridge according to the seventh embodiment of the present invention. It is explanatory drawing which shows a mode that it moves from an engagement cancellation | release position to an engagement position by an inclined surface. FIG. 49A is an explanatory view illustrating the mounting of the developing cartridge to the main body casing with the handle member disposed at the tilt position in the developing cartridge according to the seventh embodiment of the present invention. It is explanatory drawing which shows the state arrange | positioned. FIG. 49B is an explanatory view for explaining the mounting of the developing cartridge in the main body casing in the state where the handle member is disposed at the tilt position in the developing cartridge according to the seventh embodiment of the present invention. It is explanatory drawing which shows the state which the engagement shaft contact | abutted to the side wall of the main body casing in the middle of insertion. FIG. 50A is an explanatory diagram illustrating a modification of the developing electrode of the present invention, and is an explanatory diagram illustrating the developing electrode in which the contact portion of the conductive member is covered with a thick insulating member. FIG. 50B is an exploded view of the developing electrode shown in FIG. 50A. FIG. 51A is an explanatory diagram illustrating a modified example of the developing electrode of the present invention, and is an explanatory diagram illustrating the developing electrode in which the contact portion of the conductive member is covered with a thin insulating member. FIG. 51B is an exploded view of the developing electrode shown in FIG. 51A. FIG. 52A is an explanatory diagram illustrating a modified example of the developing electrode, and is an explanatory diagram illustrating the developing electrode in which the conductive member has a tapered shape. FIG. 52B is an exploded view of the developing electrode shown in FIG. 52A. FIG. 53A is an explanatory diagram illustrating a modification of the developing electrode, and is an explanatory diagram illustrating the developing electrode in which the conductive member is a wire. FIG. 53B is an exploded view of the developing electrode shown in FIG. 53A. FIG. 54A is an explanatory diagram illustrating a modified example of the developing electrode, and is an explanatory diagram illustrating a state where the conductive member is located at the inward position. FIG. 54B is an explanatory diagram illustrating a modified example of the developing electrode, and is an explanatory diagram illustrating a state where the conductive member is located at the outer position. FIG. 55A is an explanatory view illustrating the assembled state of the developing electrode shown in FIG. 54B, and is an explanatory view illustrating the state where the developing electrode is assembled to the drive unit cover. FIG. 55B is an explanatory diagram for explaining the assembled state of the developing electrode shown in FIG. 54B, and is an explanatory diagram showing a state in which the developing electrode is disassembled. FIG. 56A is a cross-sectional view of the developing electrode shown in FIG. 54B, showing a state where the conductive member is located at the inward position. FIG. 56B is a cross-sectional view of the developing electrode shown in FIG. 54B, showing a state where the conductive member is located at the outer position. FIG. 57A is an explanatory diagram illustrating a modified example of the developing electrode, and is an explanatory diagram illustrating a state where the conductive member is located at the inward position. FIG. 57B is an explanatory diagram illustrating a modified example of the developing electrode, and is an explanatory diagram illustrating a state where the conductive member is located at the outer position. FIG. 58A is an explanatory diagram illustrating a modified example of the developing electrode, and is an explanatory diagram illustrating a state where the conductive member is located at the inward position. FIG. 58B is an explanatory diagram illustrating a modified example of the developing electrode, and is an explanatory diagram illustrating a state where the conductive member is located at the outer position.

1. Outline of Developer Cartridge An outline of the developer cartridge 7A to which the first embodiment of the present invention is applied will be described with reference to FIG.

  In the following description, when referring to the direction of the developing cartridge 7A, the state in which the developing cartridge 7A is horizontally placed is used as an upper and lower reference. That is, the upper side in FIG. 1 is the upper side, and the lower side is the lower side. Further, the right side of FIG. 1 is the front side, and the left side of FIG. 1 is the rear side. Further, when the developing cartridge 7A is viewed from the front, the left and right reference is used. That is, the front side in FIG. 1 is the left side, and the back side is the right side.

  The developing cartridge 7 </ b> A includes a developing roller 11, a supply roller 12, a layer thickness regulating blade 13, a toner container 14, and an agitator 6.

  The developing roller 11 is rotatably supported at the rear end portion of the developing cartridge 7A. A part of the developing roller 11 is exposed from the opening at the rear end of the developing cartridge 7A.

  The supply roller 12 is rotatably supported by the developing cartridge 7A at the front lower side of the developing roller 11. The supply roller 12 is in contact with the front lower part of the developing roller 11.

  The layer thickness regulating blade 13 is disposed above the developing roller 11. The layer thickness regulating blade 13 has a substantially flat plate shape that is long in the left-right direction. The lower end portion of the layer thickness regulating blade 13 is in contact with the front portion of the developing roller 11.

  The toner container 14 is disposed in front of the supply roller 12 and the layer thickness regulating blade 13. The toner storage unit 14 is configured to store toner.

  The agitator 6 is configured to rotate in the toner storage unit 14.

The agitator 6 is configured to agitate the toner in the toner container 14 and supply the agitated toner to the supply roller 12. The supply roller 12 is configured to supply the supplied toner to the developing roller 11 and to frictionally charge the toner to a positive polarity between the supply roller 12 and the developing roller 11. The layer thickness regulating blade 13 is configured to regulate the toner carried on the developing roller 11 to a certain thickness.
2. Overall Configuration of Printer A printer 1 as an example of an electrophotographic image forming apparatus using a developing cartridge 7 will be described with reference to FIG.

  The printer 1 is an electrophotographic monochrome printer. The printer 1 includes a substantially box-shaped main body casing 2 and a process cartridge 5.

  The main casing 2 includes a front wall, a rear wall, an upper wall, a lower wall, a left wall, a right wall, and a front cover 4. The front wall has an opening 3 penetrating in the front-rear direction. The opening 3 is configured so that the process cartridge 5 can move between the inside of the main casing 2 and the outside of the main casing 2.

  The front cover 4 is swingably supported by the front wall with its lower end as a fulcrum. The front cover 4 is configured to open or close the opening 3.

  The process cartridge 5 includes a drum cartridge 20 and a developing cartridge 7A.

  The drum cartridge 20 includes a photosensitive drum 8, a scorotron charger 9, a transfer roller 10, and a housing portion 20A.

  The photosensitive drum 8 is rotatably supported at the rear end portion of the process cartridge 5. The photosensitive drum 8 has a substantially cylindrical shape that is long in the left-right direction.

  The scorotron charger 9 is disposed behind the photosensitive drum 8 at a distance from the photosensitive drum 8.

  The transfer roller 10 is disposed below the photosensitive drum 8 and is in contact with the lower end portion of the photosensitive drum 8.

  The accommodating portion 20A is configured to detachably accommodate the developing cartridge 7.

  Next, removal of the process cartridge 5 from the main casing 2 will be described.

  The process cartridge 5 mounted in the main casing 2 is removed from the main casing 2 through the opening 3 by the operator when the front cover 4 opens the opening 3. The developer cartridge 7 is removed from the drum cartridge 20 of the process cartridge 5 removed from the main casing 2 by the operator. Thereby, the developing cartridge 7 can be replaced.

  Next, mounting of the process cartridge 5 on the main casing 2 will be described.

The developing cartridge 7 is attached to the drum cartridge 20. The process cartridge 5 to which the developing cartridge 7 is mounted is mounted in the main body casing 2 through the opening 3.
3. Developing Cartridge Next, the detailed configuration of the developing cartridge 7A will be described with reference to FIGS.

As illustrated in FIG. 3, the developing cartridge 7 </ b> A includes a frame 21 that supports the developing roller 11 and the supply roller 12, a drive unit 22 that is disposed on the left side of the frame 21, and a power reception that is disposed on the right side of the frame 21. The unit 23 and the operation unit 24 arranged in front of the frame 21 are further provided.
(1) Frame As shown in FIGS. 1 and 3, the frame 21 has a substantially box shape extending in the left-right direction. The frame 21 includes a first frame 25 and a second frame 26.
(1-1) First Frame As shown in FIGS. 1 and 4, the first frame 25 has a bottomed frame shape that is open upward and rearward. The first frame 25 is integrally provided with a pair of side walls 27, a front wall 28, and a lower wall 29. In the following description, of the pair of side walls 27, the left side wall 27 is described as a left wall 27L, and the right side wall 27 is described as a right wall 27R.
(1-1-1) Side Wall Each of the pair of side walls 27 is disposed with a space in the left-right direction. Each of the pair of side walls 27 has a flat plate shape that is substantially rectangular in side view and extends in the front-rear direction. Each of the pair of side walls 27 has a hole 30 and a groove 31. Further, the left wall 27L includes a pair of protrusions 33.

  The hole 30 is disposed at the lower rear end of the side wall 27. The hole 30 penetrates each of the pair of side walls 27 in the left-right direction. The hole 30 has a substantially rectangular shape in side view. The dimension of each side of the hole 30 is longer than the diameter of a supply roller shaft 121 described later.

  The groove 31 is notched forward from the rear end of each of the pair of side walls 27. The groove 31 has a substantially U shape in a side view in which a rear end portion is opened. The height in the vertical direction of the groove 31 is longer than the diameter of the end portion in the left-right direction of the developing roller shaft 111 described later.

Each of the pair of protrusions 33 is disposed in front of the hole 30 with a space in the front-rear direction. Each of the pair of protrusions 33 protrudes leftward from the lower end portion of the left wall 27L. Each of the pair of protrusions 33 has a substantially cylindrical shape extending in the left-right direction.
(1-1-2) Front Wall The front wall 28 is constructed between the front end portions of the pair of side walls 27. The front wall 28 has a substantially flat plate shape extending in the vertical direction.
(1-1-3) Lower Wall The lower wall 29 is constructed between the lower ends of the pair of side walls 27. The lower wall 29 has a substantially flat plate shape that extends while being bent in the front-rear direction. The lower wall 29 includes a first portion 29A, a second portion 29B, a third portion 29C, and a plurality of reinforcing ribs 32.

  The first portion 29A extends from the lower end portion of the front wall 28 while curving backward. The rear end portion of the first portion 29 </ b> A is disposed in front of the supply roller 12. The first portion 29 </ b> A constitutes the lower wall of the toner storage unit 14.

  The second portion 29 </ b> B extends from the rear end portion of the first portion 29 </ b> A while curving backward along the peripheral surface of the supply roller 12. The rear end portion of the second portion 29 </ b> B is disposed below the contact portion between the developing roller 11 and the supply roller 12. The second portion 29B covers the supply roller 12 from below.

  The third portion 29C extends rearward from the rear end portion of the second portion 29B. The rear end portion of the third portion 29 </ b> C is disposed behind the rear end portion of the developing roller 11. The third portion 29C covers the developing roller 11 from below.

The plurality of reinforcing ribs 32 are arranged in parallel in the left-right direction at intervals. The reinforcing rib 32 projects downward from the lower surface of the rear end portion of the lower wall 29 and extends in the front-rear direction from the rear end portion of the first portion 29A to the rear end portion of the third portion 29C. The reinforcing rib 32 has a substantially flat plate shape.
(1-2) Second Frame As shown in FIGS. 1 and 3, the second frame 26 is disposed above the pair of side walls 27 and the upper end of the front wall 28 of the first frame 25. The second frame 26 has a substantially flat plate shape extending in the front-rear and left-right directions. The second frame 26 is fixed to the upper ends of the pair of side walls 27 and the front wall 28 of the first frame 25 by a method such as welding at the periphery thereof.
(1-3) Developing Roller and Supply Roller The developing roller 11 includes a developing roller shaft 111, a developing roller body 112, a left collar 49, and a right collar 77.

  As shown in FIGS. 8, 11 and 12, the developing roller shaft 111 has a substantially cylindrical shape extending in the left-right direction. That is, the central axis A1 of the developing roller shaft 111 extends in the left-right direction. The developing roller shaft 111 is made of metal. The left and right end portions of the developing roller shaft 111 protrude outward in the left-right direction from the side walls 27 of the frame 21 through the grooves 31 of the frame 21. The developing roller shaft 111 includes a support portion 111A and a support portion 111B.

  111 A of support parts are arrange | positioned at the part of the both ends of the left-right direction of the developing roller axis | shaft 111 exposed to the outer side of the left-right direction rather than the side wall 27. As shown in FIG. The support portion 111A has a substantially D shape in cross section.

  The support portion 111B extends outward in the left-right direction from the support portions 111A at both ends of the developing roller shaft 111. The support part 111B has a substantially cylindrical shape. The outer diameter of the support part 111B is smaller than the outer diameter of the support part 111A.

  The developing roller body 112 is a conductive rubber roller. The developing roller body 112 has a substantially cylindrical shape extending in the left-right direction. The developing roller main body 112 covers the developing roller shaft 111 so that the support portion 111A and the support portion 111B of the developing roller shaft 111 are exposed.

  The left collar 49 is disposed on the left side of the developing gear 45 described later. The left collar 49 has a substantially cylindrical shape extending in the left-right direction. The left collar 49 is fitted in a support portion 111B (not shown) at the left end portion of the developing roller shaft 111.

  The right collar 77 is disposed at the right end portion of the developing roller shaft 111. The right collar 77 has a substantially cylindrical shape extending in the left-right direction. The right collar 77 is fitted in the support portion 111 </ b> B at the right end portion of the developing roller shaft 111.

  As shown in FIG. 1, the supply roller 12 includes a supply roller shaft 121 and a supply roller main body 122.

  As shown in FIGS. 8 and 11, the supply roller shaft 121 has a substantially cylindrical shape extending in the left-right direction. That is, the center axis A2 of the supply roller shaft 121 extends in the left-right direction. The supply roller shaft 121 is made of metal. An end portion in the left-right direction of the supply roller shaft 121 protrudes outward in the left-right direction from the side wall 27 of the frame 21 through the hole 30 of the frame 21. The supply roller shaft 121 includes a support part 121A, a support part 121B, and a support part 121C.

  The support portion 121A is exposed to the right of the right wall 27R at the right end portion of the supply roller shaft 121. The support portion 121A has a substantially D shape in cross section.

  The support part 121B extends rightward from the support part 121A. The support part 121B has a substantially cylindrical shape. The outer diameter of the support part 121B is smaller than the outer diameter of the support part 121A.

  The support portion 121C is exposed to the left of the left wall 27L at the left end portion of the supply roller shaft 121. The support portion 121C has a substantially D shape in cross section.

The supply roller main body 122 is a sponge roller having conductivity. The supply roller main body 122 has a substantially cylindrical shape extending in the left-right direction. The supply roller main body 122 covers the supply roller shaft 121 so that the support portion 121A, the support portion 121B, and the support portion 121C of the supply roller shaft 121 are exposed.
(2) Drive Unit The drive unit 22 includes a bearing member 36, a first gear train 37, a compression spring 39, a left linear cam 38, and a cover 40, as shown in FIGS. Yes.
(2-1) Bearing Member As shown in FIGS. 7 and 8, the bearing member 36 is supported by the rear end portion of the left wall 27L. The bearing member 36 has a substantially rectangular flat plate shape that extends in the vertical direction when viewed from the side. The bearing member 36 has a hole 41, a hole 42, and a guide rib 43.

  The hole 41 is disposed at the rear end portion of the bearing member 36. The hole 41 is configured to penetrate the bearing member 36 in the left-right direction. The hole 41 has a substantially circular shape in a side view. The inner diameter of the hole 41 is slightly larger than the outer diameter of the developing roller shaft 111.

  The hole 42 is disposed in front of and below the hole 41. The hole 42 is configured to penetrate the bearing member 36 in the left-right direction. The hole 42 has a substantially circular shape in a side view. The inner diameter of the hole 42 is slightly larger than the outer diameter of the supply roller shaft 121.

The guide rib 43 has an upper guide rib 43A and a lower guide rib 43B. The upper guide rib 43A is disposed on the opposite side of the lower guide rib 43B across the hole 42 in the vertical direction. The upper guide rib 43A and the lower guide rib 43B protrude leftward from the left surface of the bearing member 36 and extend in the front-rear direction. The front end portions of the upper guide rib 43 </ b> A and the lower guide rib 43 </ b> B are disposed at the front end portion of the bearing member 36. The rear end portion of the upper guide rib 43 </ b> A is disposed above the hole 42. The rear end portion of the lower guide rib 43 </ b> B is disposed at the rear end portion of the bearing member 36.
(2-2) First Gear Train The first gear train 37 includes a development coupling 44 and a development gear 45.
(2-2-1) Development Coupling The development coupling 44 has a substantially cylindrical shape extending in the left-right direction. As shown in FIG. 14, the development coupling 44 is supported by a support portion 121 </ b> C of the supply roller shaft 121 so as to be rotatable relative to the supply roller shaft 121. The rotation center C of the developing coupling 44 coincides with the central axis A2 of the supply roller shaft 121. The development coupling 44 is disposed so as to overlap the second portion 29B of the lower wall 29 of the frame 21 when projected in the left-right direction, as indicated by phantom lines in FIG.

  The development coupling 44 is movable between an inner position (see FIG. 14) and an outer position (see FIG. 19) along the left-right direction. The moving distance D1 from the inner position to the outer position of the development coupling 44 is, for example, 5 mm or more and 30 mm or less. The moving distance D1 of the developing coupling 44 is, for example, 1.5 times or more and 2 times or less with respect to the outer diameter of the gear portion 46 of the developing coupling 44 described later.

  When the developing coupling 44 is located in the inward position, the left end edge 44A of the developing coupling 44 is formed on the left surface of the cover 40 and the left collar 49 of the developing roller 11 as shown in FIGS. It is located at the same horizontal position as the left side. When the development coupling 44 is located at the outward position, the left end edge 44A of the development coupling 44 is formed on the left surface of the cover 40 and the left collar 49 of the development roller 11 as shown in FIGS. It is located to the left of the left side. In other words, the outer position of the developing coupling 44 is located outward in the left-right direction with respect to the inner position of the developing coupling 44.

  As shown in FIGS. 8, 9, and 14, the development coupling 44 has a gear portion 46, a coupling portion 47, and a hole 50.

  The gear portion 46 is disposed at the right end portion of the development coupling 44. The gear portion 46 has a substantially disk shape having a thickness in the left-right direction. Moreover, the gear part 46 is equipped with the gear tooth over all the surrounding surfaces. The gear teeth are left-handed helical teeth.

  The gear portion 46 meshes with the right end portion of the developing gear 45 as shown in FIGS. 6 and 14 when the developing coupling 44 is in the inward position. The gear portion 46 meshes with the left end portion of the developing gear 45 as shown in FIGS. 17 and 19 when the developing coupling 44 is located at the outward position.

  The coupling portion 47 protrudes leftward from the left surface of the gear portion 46. The coupling part 47 has a substantially cylindrical shape. The outer diameter of the coupling portion 47 is smaller than the outer diameter of the gear portion 46. The central axis of the coupling part 47 coincides with the central axis of the gear part 46. The coupling portion 47 includes a recess 48.

  The recess 48 is recessed rightward from the left surface of the coupling portion 47. The concave portion 48 has a substantially long hole shape in side view extending in the radial direction of the coupling portion 47.

As shown in FIG. 14, the hole 50 is recessed from the right surface of the developing coupling 44 toward the left. The hole 50 has a substantially circular shape in a side view. The diameter of the hole 50 is slightly larger than the outer diameter of the supply roller shaft 121. The hole 50 receives the support portion 121 </ b> C of the supply roller shaft 121.
(2-2-2) Developing Gear As shown in FIGS. 7 and 8, the developing gear 45 has a substantially cylindrical shape extending in the left-right direction. The developing gear 45 has a through hole (not shown) having a substantially D shape in side view at the center in the radial direction. As shown in FIGS. 6 and 8, the developing gear 45 is supported by a support portion 111 </ b> A at the left end portion of the developing roller shaft 111. In this state, the support portion 111 </ b> A at the left end portion of the developing roller shaft 111 is fitted in a through hole (not shown) of the developing gear 45. As a result, the developing gear 45 cannot rotate relative to the developing roller shaft 111 and can rotate with the developing roller shaft 111. The dimension in the left-right direction of the developing gear 45 is longer than the dimension in the left-right direction of the gear part 46 of the coupling part 47. The developing gear 45 has gear teeth over the entire peripheral surface thereof. The gear teeth are right-twisted helical teeth as shown in FIG.
(2-3) Compression Spring The compression spring 39 is a coil spring as shown in FIG. The diameter of the compression spring 39 is larger than the outer diameter of the coupling portion 47 of the developing coupling 44 and smaller than the outer diameter of the gear portion 46. The compression spring 39 is supported by the coupling portion 47 of the developing coupling 44. As shown in FIG. 14, the right end portion of the compression spring 39 is in contact with the left surface of the gear portion 46 of the developing coupling 44. The left end portion of the compression spring 39 is in contact with the peripheral edge portion of the opening 62 of the cover 40.

Thereby, the compression spring 39 always urges the developing coupling 44 toward the inward position.
(2-4) Left linear motion cam The left linear motion cam 38 has a substantially flat plate shape extending in the front-rear direction, as shown in FIGS. The left linear cam 38 is supported by the left wall 27L above the pair of protrusions 33. The left linear cam 38 has a pressing position (see FIG. 17) for pressing the developing coupling 44 leftward along the front-rear direction, and a pressing releasing position (see FIG. 17) for releasing the pressing against the developing coupling 44 leftward. 6). The left linear cam 38 includes a contact portion 51, a connecting portion 53, and a contact portion 52.
(2-4-1) Contact Part The contact part 51 is disposed at the rear end part of the left linear cam 38. The contact portion 51 has a substantially U shape in side view with the rear opened. The contact portion 51 is disposed between the upper guide rib 43A and the lower guide rib 43B. The contact part 51 includes a displacement part 54 and a holding part 55.

  The displacement portion 54 is disposed at the rear end portion of the contact portion 51. The left surface of the displacement portion 54 is inclined leftward from the rear to the front. In other words, the projecting length of the displacement portion 54 gradually increases from the rear toward the front.

The holding part 55 is continuous behind the displacement part 54. The left surface of the holding portion 55 is continuous with the front end portion of the left surface of the displacement portion 54 and extends in the front-rear direction.
(2-4-2) Connecting Part The connecting part 53 continuously extends forward from the front end of the contact part 51. The connecting portion 53 has a substantially rectangular shape in side view that is long in the front-rear direction. The connecting portion 53 includes a protrusion 60.

The protrusion 60 protrudes downward from the substantially center of the connecting portion 53 in the front-rear direction. The protrusion 60 has a substantially rectangular shape in a side view. The protrusion 60 is disposed between the pair of protrusions 33.
(2-4-3) Contact Part The contact part 52 is disposed at the front end part of the left linear cam 38. The contact portion 52 has a substantially U shape in side view with the lower part opened. The contact part 52 includes a first engagement part 56, a spacer part 59, and a second engagement part 57.

  The first engaging portion 56 includes an inclined portion 56A and a vertical portion 56B. The inclined portion 56 </ b> A extends forward and upward from the front end portion of the connecting portion 53. The vertical portion 56B extends upward from the front upper end of the inclined portion 56A. The vertical portion 56 </ b> B includes a protrusion 58. The protrusion 58 is disposed substantially at the center in the vertical direction of the vertical portion 56B. The protrusion 58 protrudes forward from the front edge of the vertical portion 56B. The protrusion 58 has a substantially semicircular shape when viewed from the side.

  The spacer portion 59 extends forward from the upper end portion of the first engagement portion 56. The length of the spacer portion 59 in the front-rear direction is longer than the diameter of a projection 105 described later of the operation portion 24.

The second engaging portion 57 includes a vertical portion 57A and an inclined portion 57B. The vertical portion 57 </ b> A extends downward from the front end portion of the spacer portion 59. The inclined portion 57B extends forward and downward from the lower end portion of the vertical portion 57A, bends downward at the front lower end portion, and extends downward.
(2-5) Cover As shown in FIG. 5, the cover 40 has a substantially box shape in which the right end portion and the front end portion are opened. The cover 40 is fixed to the left wall 27L of the frame 21 with screws (not shown). The cover 40 has an opening 61 and an opening 62.

  The opening 61 is notched forward from the rear end of the cover 40. The opening 61 has a substantially C-shape in side view that is opened rearward. The inner diameter of the opening 61 is larger than the outer diameter of the developing gear 45. The opening 61 is configured to expose a part of the developing gear 45.

The opening 62 is disposed in front of and below the opening 61. The opening 62 penetrates the left wall of the cover 40 so that the development coupling 44 can move between an inward position and an outward position. The opening 62 has a substantially circular shape in side view.
(3) Power receiving unit As shown in FIGS. 10 and 11, the power receiving unit 23 includes a second gear train 66, a support member 67, a developing electrode 65, a compression spring 64, a right translation cam 68, and a cover. 69.
(3-1) Second Gear Train The second gear train 66 includes a first idle gear 70, a second idle gear 71, and a supply gear 72, as shown in FIG.

  The first idle gear 70 has a substantially disc shape having a thickness in the left-right direction. The first idle gear 70 has a through hole (not shown) having a substantially D shape in side view at the center in the radial direction. The first idle gear 70 has gear teeth over the entire peripheral surface thereof. The first idle gear 70 is supported by the support portion 111 </ b> A of the developing roller shaft 111. A through hole (not shown) of the first idle gear 70 engages with the support portion 111 </ b> A so that the first idle gear 70 cannot rotate relative to the developing roller shaft 111.

  The second idle gear 71 has a substantially disc shape having a thickness in the left-right direction. The second idle gear 71 meshes with the front end portion of the first idle gear 70. The second idle gear 71 has a through hole 71 </ b> A having a substantially circular shape in a side view at the radial center. The second idle gear 71 has gear teeth over the entire peripheral surface. The second idle gear 71 is supported by a later-described protrusion 73 of the support member 67. The through hole 71 </ b> A of the second idle gear 71 is fitted with the support portion 121 </ b> A so as to be rotatable relative to the protrusion 73.

The supply gear 72 has a substantially disk shape having a thickness in the left-right direction. The supply gear 72 meshes with the front lower end portion of the second idle gear 71. The supply gear 72 has a substantially D-shaped through hole 72A in a side view in the radial center. The supply gear 72 includes gear teeth over the entire peripheral surface thereof. The supply gear 72 is supported by the support portion 121 </ b> A of the supply roller shaft 121. The through hole 72 </ b> A of the supply gear 72 fits in the support portion 121 </ b> A so that the supply gear 72 cannot rotate relative to the supply roller shaft 121.
(3-2) Support Member As shown in FIGS. 11 and 14, the support member 67 is disposed on the right side of the second gear train 66. The support member 67 has a flat plate shape that is substantially rectangular in a side view. The support member 67 is made of a conductive material such as a conductive resin, for example. The support member 67 has a hole 75, a protrusion 73, a hole 78, and a protrusion 74.

  The hole 75 is disposed at the rear upper end of the support member 67. The hole 75 penetrates the support member 67 in the left-right direction. The hole 75 has a substantially circular shape in a side view. The size of the hole 75 is slightly larger than the size of the developing roller shaft 111.

  The protrusion 73 is disposed at the front upper end of the support member 67. The protrusion 73 protrudes leftward from the left surface of the support member 67. The protrusion 73 has a substantially cylindrical shape.

  The hole 78 is disposed at the front lower end of the support member 67. The hole 78 penetrates the support member 67 in the left-right direction. The hole 78 has a substantially circular shape in side view. The size of the hole 78 is slightly larger than the size of the support portion 121 </ b> B of the supply roller shaft 121.

  The protrusion 74 protrudes rightward from the peripheral edge of the hole 78. The protrusion 74 has a substantially cylindrical shape. The height in the vertical direction of the protrusion 74 is substantially the same as the height in the vertical direction of a support portion 92 described later of the developing electrode 65. The protrusion 74 has a pair of grooves 76.

Each of the pair of grooves 76 is disposed at the upper end portion and the lower end portion of the protrusion 74, respectively. Each of the pair of grooves 76 is cut away from the right end portion of the protrusion 74 toward the left so as to penetrate the peripheral wall of the protrusion 74 in the radial direction of the protrusion 74. Each of the pair of grooves 76 has a substantially straight line shape in plan view with the right end portion opened. The dimension in the front-rear direction of the groove 76 is slightly longer than the dimension in the front-rear direction of a support portion 92 described later of the developing electrode 65.
(3-3) Development Electrode The development electrode 65 has a substantially T shape when viewed from the front. The developing electrode 65 is made of a conductive material such as metal or conductive resin, for example. The development electrode 65 overlaps the development coupling 44 when the development coupling 44 is projected along the left-right direction. The developing electrode 65 is movable between an inner position (see FIG. 12) and an outer position (see FIG. 18) along the left-right direction. The moving distance D2 from the inner position to the outer position of the developing electrode 65 is, for example, 5 mm or more and 30 mm or less. The development electrode 65 includes a support portion 92, a contact portion 91, and a contact portion 93.
(3-3-1) Support Unit The support unit 92 is disposed at the left end of the developing electrode 65. The support part 92 has a substantially rectangular flat plate shape extending in the vertical direction when viewed from the front. The support portion 92 is located in the groove 76.
(3-3-2) Contact Part The contact part 91 extends rightward from the center of the support part 92 in the vertical direction. The contact portion 91 has a substantially cylindrical shape that is long in the left-right direction. As shown in FIGS. 11 and 14, the contact portion 91 is disposed so as to coincide with the central axis A <b> 2 of the supply roller shaft 121. In other words, the contact portion 91 is disposed on the rotation center C of the development coupling 44. The diameter of the contact part 91 is 0.01 mm or more and 3 mm or less, for example. The contact portion 91 has a contact 91 </ b> A that contacts the main body electrode 117 at the right end portion.

The contact 91 </ b> A is positioned to the left of the right surface of the right collar 77 of the developing roller 11 when the developing electrode 65 is positioned in the inward position. As shown in FIGS. 18 and 19, the contact 91 </ b> A is located on the right side of the right surface of the right collar 77 of the developing roller 11 when the developing electrode 65 is located at the outward position. That is, the outer position of the developing electrode 65 is located outward in the left-right direction with respect to the inner position of the developing electrode 65.
(3-3-3) Contact Part The contact part 93 includes an upper contact part 93A and a lower contact part 93B. The upper contact portion 93 </ b> A extends upward from the upper end portion of the support portion 92. The upper contact portion 93 </ b> A protrudes upward from the upper end portion of the protrusion 74. The lower contact portion 93 </ b> B extends downward from the lower end portion of the support portion 92. The lower contact portion 93 </ b> B protrudes downward from the lower end portion of the protrusion 74. The upper contact portion 93A and the lower contact portion 93B have a substantially prismatic shape.

The development electrode 65 is supported in the protrusion 74 as shown in FIGS.
(3-4) Compression Spring The compression spring 64 is a coil spring. The diameter of the compression spring 64 is larger than the outer diameter of the protrusion 74 and smaller than the vertical length of the developing electrode 65. The compression spring 64 is loosely fitted to the protrusion 74 from the radially outer side of the protrusion 74. The compression spring 64 is in contact with the support member 67 from the right at its left end, and is in contact with the contact portion 93 of the developing electrode 65 from the left at its right end. The compression spring 64 always urges the developing electrode 65 toward the outward position.
(3-5) Right translation cam The right translation cam 68 has a substantially flat plate shape extending in the front-rear direction, as shown in FIGS. 11 and 13. As shown in FIGS. 12 and 14, the right translation cam 68 is supported on the left surface of the right wall of the cover 69. The right translation cam 68 has a pressing position for pressing the developing electrode 65 leftward along the front-rear direction (see FIG. 12) and a pressing releasing position for releasing the pressing against the developing electrode 65 leftward (see FIG. 18). ). The right translation cam 68 includes a contact portion 81, a connecting portion 83, and a contact portion 82.
(3-5-1) Contact Part The contact part 81 is disposed at the rear end part of the right linear cam 68. The contact part 81 has a substantially rectangular shape in side view. The contact part 81 has a hole 84 and a cam part 85.

  The hole 84 penetrates the contact portion 81 in the left-right direction. The hole 84 has a substantially rectangular shape in side view extending in the front-rear direction. The size of the hole 84 is slightly larger than the size of the contact portion 91 of the developing electrode 65.

  The cam portion 85 is disposed at the rear end portion of the contact portion 81. The cam portion 85 protrudes leftward from the peripheral portion of the rear half of the hole 84. The cam portion 85 has a substantially U shape in side view with the front open. The cam portion 85 includes a displacement portion 86 and a holding portion 87.

  The displacement portion 86 is disposed at the front end portion of the cam portion 85. The left surface of the displacement part 86 is inclined leftward from the front toward the rear. In other words, the protruding length of the displacement portion 86 becomes gradually longer from the front to the rear.

The holding part 87 is continued behind the displacement part 86. The left surface of the holding portion 87 is continuous with the rear end portion of the left surface of the displacement portion 86 and extends in the front-rear direction.
(3-5-2) Connecting Part The connecting part 83 continuously extends forward from the front end part of the contact part 81. The connecting portion 53 has a substantially rectangular shape in side view that is long in the front-rear direction.
(3-5-3) Contact Part The contact part 82 is disposed at the front end of the right linear cam 68. The contact portion 82 has a substantially C shape in side view with the rear opened. The contact portion 82 includes a first engagement portion 88 and a second engagement portion 89.

  The first engaging portion 88 includes a vertical portion 88A and a hook-shaped portion 88B. The vertical portion 88 </ b> A extends upward from the front end portion of the connecting portion 83. The vertical portion 88 </ b> A includes a protrusion 90. The protrusion 90 is disposed substantially at the center in the vertical direction of the vertical portion 88 </ b> A of the first engagement portion 88. The protrusion 90 protrudes forward from the front edge of the vertical portion 88A. The protrusion 90 has a substantially semicircular shape in a side view. The hook-shaped portion 88B extends forward from the upper end portion of the vertical portion 88A, and is bent downward at the front end portion thereof.

The second engaging portion 89 extends forward from the front end portion of the connecting portion 83 and is bent upward at the front end portion.
(3-4) Cover As shown in FIGS. 10 and 14, the cover 69 has a substantially box shape in which the left end portion and the front end portion are opened. The cover 69 is fixed to the right wall 27R of the frame 21 by screws (not shown). The cover 69 is configured to cover the second gear train 66, the support member 67, the compression spring 64, the developing electrode 65, and the right translation cam 68. The cover 69 has an opening 94 and a protrusion 95.

  The opening 94 is disposed at the front end portion of the cover 69. The opening 94 penetrates the right wall of the cover 69 in the left-right direction. The opening 94 has a substantially circular shape in side view. The opening 94 is configured to expose the right collar 77.

  The protrusion 95 is disposed on the front lower side of the opening 94. The protrusion 95 extends rightward from the right wall of the cover 69. The protrusion 95 has a substantially cylindrical shape. The protrusion 95 has a hole 96.

The hole 96 is disposed at the radial center of the protrusion 95. The hole 96 penetrates the protrusion 95 and the right wall of the cover 69 in the left-right direction. The hole 96 has a substantially circular shape in side view. The size of the hole 96 is slightly larger than the size of the contact portion 91 of the developing electrode 65.
(4) Operation part The operation part 24 is provided with the handle member 101, the control member 104, and the compression spring 108, as shown in FIG.10 and FIG.11. In the following description of the operation unit 24, when referring to the direction of the operation unit 24, the state shown in FIG.
(4-1) Handle Member The handle member 101 constitutes the main body of the operation unit 24. The handle member 101 has a substantially prismatic shape that is long in the left-right direction. The handle member 101 is supported on the front wall 28 of the frame 21. The handle member 101 has an extended position (see FIG. 13) extending rearward from the front wall 28 of the frame 21 and a tilt position (see FIG. 16B) that hangs down in the vertical direction along the front wall 28 of the frame 21. It is configured to swing around the front end of the handle member 101 as a fulcrum. The handle member 101 includes a grip portion 102 and a pair of link portions 103.
(4-1-1) Gripping Unit The gripping unit 102 is a central portion in the left-right direction of the handle member 101 and includes a hole 109 and a grip 110.

  The hole 109 is disposed substantially at the center in the left-right direction of the handle member 101. The hole 109 penetrates the handle member 101 in the vertical direction. The hole 109 has a substantially rectangular shape in plan view that is long in the left-right direction.

The grip 110 is disposed in front of the hole 109. The grip 110 constitutes the front wall of the hole 109. The grip 110 has a substantially flat plate shape that is long in the left-right direction.
(4-1-2) Link part The link part 103 has the substantially fan shape centering on the rear-end part of the handle member 101. FIG. The link unit 103 includes a left link unit 103A and a right link unit 103B.

  The left link portion 103A protrudes downward from the left end portion of the handle member 101. As shown in FIGS. 6 and 7, the left link portion 103 </ b> A is disposed on the left side of the contact portion 52 of the left linear cam 38 and on the right side of the cover 40. The left link portion 103A includes a protrusion 105A.

  The protrusion 105A is disposed at the lower end portion of the left link portion 103A. The protrusion 105A protrudes inward in the left-right direction from the inner surface in the left-right direction of the left link portion 103A. The protrusion 105A has a substantially cylindrical shape. The protrusion 105 </ b> A is disposed between the first engagement portion 56 and the second engagement portion 57.

  The right link portion 103B protrudes downward from the right end portion of the handle member 101. As shown in FIGS. 10 and 13, the right link portion 103 </ b> B is disposed on the right side of the contact portion 82 of the right linear cam 68 and on the left side of the right wall of the cover 69. The right link portion 103B includes a protrusion 105B and a support portion 106.

  The protrusion 105B is disposed at the lower end portion of the right link portion 103B. The protrusion 105B protrudes inward in the left-right direction from the inner surface in the left-right direction of the right link portion 103B. The protrusion 105B has a substantially cylindrical shape. The protrusion 105 </ b> B is disposed between the first engagement portion 88 and the second engagement portion 89.

The support part 106 is disposed at the substantially vertical center of the right link part 103B. The support part 106 is a recessed part recessed toward the left from the right surface of the right link part 103B. The support part 106 has a substantially circular shape in a side view.
(4-2) Restriction Member The restriction member 104 is disposed in the support portion 106. The regulating member 104 has a substantially cylindrical shape extending in the left-right direction. The restricting member 104 includes an engaging claw 107.

The engaging claw 107 extends leftward from the left end portion of the regulating member 104. The left end portion of the engaging claw 107 has a substantially bowl shape that is bent outward in the radial direction of the regulating member 104.
(4-3) Compression Spring The compression spring 108 is arrange | positioned in the support part 106, as shown in FIG. The compression spring 108 is a coil spring extending in the left-right direction. The left end portion of the compression spring 108 is in contact with the left wall of the support portion 106. Further, the right end portion of the compression spring 108 is in contact with the right wall of the regulating member 104. Thereby, the compression spring 108 always urges the regulating member 104 to the right.
3. Development Coupling and Development Electrode Advancement or Retraction (1) Development Coupling and Development Electrode Movement from Inward Position to Outward Next Next, Development Coupling 44 and Development Electrode 65 from Inward Position to Outward Position The movement will be described.

  The developing coupling 44 and the developing electrode 65 are disposed in the inward position before the developing cartridge 7A is accommodated in the main casing 2. When the development coupling 44 and the development electrode 65 are disposed in the inward position, as shown in FIG. 14, the distance W1 between the left end edge 44A of the development coupling 44 and the contact 91A of the development electrode 65 is equal to the development cartridge. It is smaller than the left-right direction length W3 of 7A.

  When the developing cartridge 7A is disposed outside the main body casing 2 and the handle member 101 is disposed at the extended position, the restricting member 104 is arranged in front of the cover 69 as shown in FIG. It protrudes from the support part 106 to the right side by the urging force. In this state, when the operator moves the handle member 101 from the extended position toward the tilted position, the restricting member 104 comes into contact with the front end portion of the cover 69. As a result, the handle member 101 is restricted from moving to the tilted position before the handle member 101 and the left translation cam 38 and the right translation cam 68 are interlocked.

  When the developing cartridge 7A is mounted in the main casing 2, the regulating member 104 is placed in the main casing so that the regulating member 104 is accommodated in the support portion 106 against the urging force of the compression spring 108. The release member (not shown) is urged. Thereby, the handle member 101 can be moved from the extended position to the tilted position.

  Thereafter, when the handle member 101 moves from the extended position to the tilted position, as shown in FIGS. 15A and 16A, the protrusion 105A of the handle member 101 contacts the rear end portion of the connecting portion 53 of the left linear cam 38 from the front. In addition, the protrusion 105B of the handle member 101 comes into contact with the rear end portion of the connecting portion 83 of the right translation cam 68 from the front.

  Further, when the handle member 101 is moved to the tilted position, the protrusion 105A moves to the left while moving clockwise with the rear end of the handle member 101 as a fulcrum, as shown in FIGS. 15A and 15B. The first engaging portion 56 of the linear motion cam 38 is pressed so as to slide from below to above in the order of the inclined portion 56A and the vertical portion 56B.

  As a result, the left linear cam 38 moves rearward. Then, the development coupling 44 moves to the left against the urging force of the compression spring 39 along the inclination of the displacement portion 54 of the left linear cam 38.

  Then, as shown in FIG. 15B, the protrusion 105 </ b> A climbs over the protrusion 58 and is positioned above the protrusion 58.

  At the same time, as shown in FIGS. 16A and 16B, the protrusion 105B moves in the counterclockwise direction in the left side view with the rear end portion of the handle member 101 as a fulcrum, while the first engaging portion of the right linear cam 68. 88 is pressed to slide upward from below.

  As a result, the right translation cam 68 moves rearward. Then, the developing electrode 65 moves to the right by the urging force of the compression spring 64 along the inclination of the displacement portion 86 of the right translation cam 68.

  As shown in FIG. 16B, the protrusion 105 </ b> B climbs over the protrusion 90 and is positioned above the protrusion 90.

  When the handle member 101 is positioned at the tilted position, the left linear cam 38 is positioned at the pressing position as shown in FIGS. 17 and 19, and the gear portion 46 of the developing coupling 44 is positioned at the left linear cam 38. It contacts the holding part 55 of the contact part 51 and is located at the outward position. Thereby, the movement of the developing coupling 44 from the inner position to the outer position is completed.

  Further, as shown in FIGS. 18 and 19, the right linear cam 68 is positioned at the pressing release position, and the developing electrode 65 is positioned forward of the cam portion 85 of the right linear cam 68, and the outward position. Located in. Thereby, the movement of the developing electrode 65 from the inner position to the outer position is completed.

The distance W2 between the left end edge 44A of the developing coupling 44 and the contact point 91A of the developing electrode 65 at the outer position is equal to the left end edge 44A of the developing coupling 44 at the inner position and the developing electrode 65, as shown in FIG. Longer than the distance W1 with the contact 91A.
(2) Movement of Development Coupling and Development Electrode from Outer Position to Inward Position Next, movement of the development coupling 44 and development electrode 65 from the outer position to the inner position will be described.

  When the handle member 101 moves from the tilted position to the extended position, as shown in FIG. 20A, the protrusion 105A of the handle member 101 moves counterclockwise when viewed from the left side with the rear end portion of the handle member 101 as a fulcrum. Then, it comes into contact with the lower end portion of the vertical portion 57A of the second engaging portion 57 of the left linear cam 38 from the rear.

  Further, when the handle member 101 moves to the extended position, the projection 105A slightly pushes the vertical portion 57A forward.

  As a result, the left translation cam 38 moves slightly forward.

  Further, when the handle member 101 moves to the extended position, as shown in FIG. 20B, the protrusion 105A comes into contact with the lower end portion of the inclined portion 57B of the second engaging portion 57 of the left linear cam 38 from the rear.

  Further, when the handle member 101 moves to the extended position, as shown in FIG. 20C, the left linear cam 38 is pressed by the protrusion 105A and moves forward. Then, the development coupling 44 moves to the right by the biasing force of the compression spring 39 along the inclination of the displacement portion 54 of the left linear cam 38.

  At the same time, as shown in FIG. 21A, the protrusion 105B comes into contact with the upper end portion of the second engagement portion 89 of the right translation cam 68 from the rear.

  As shown in FIG. 21B, the right translation cam 68 is pressed by the protrusion 105B and moves forward. Then, the developing electrode 65 moves to the left against the urging force of the compression spring 64 along the inclination of the displacement portion 86 of the right translation cam 68.

  When the handle member 101 is located at the extended position, as shown in FIG. 6, the left translation cam 38 is located at the pressing release position, and the development coupling 44 is moved from the contact portion 51 of the left translation cam 38. Is also located at the rear and inward. Thereby, the movement of the developing coupling 44 from the outer position to the inner position is completed.

At the same time, as shown in FIG. 12, the right translation cam 68 is located at the pressing position, and the development electrode 65 has the contact portion 93 of the development electrode 65 at the holding portion 87 of the cam portion 85 of the right translation cam 68. It abuts and is in the inward position. Thereby, the movement of the developing electrode 65 from the outer position to the inner position is completed.
4). Next, when the developing coupling 44 and the developing electrode 65 are located at the outer position, the developing coupling 44 receives a driving force from the driving source in the main casing 2 and the power source in the main casing 2. A state in which the developing electrode 65 receives power will be described.

  As indicated by phantom lines in FIG. 19, the concave portion 48 of the developing coupling 44 is not rotatable relative to the main body coupling 116 of the main body casing 2 when the developing coupling 44 is positioned in the outer position in the main body casing 2. Contact.

  Further, the contact point 91 </ b> A of the developing electrode 65 comes into contact with the main body electrode 117 of the main body casing 2 when the developing electrode 65 is located at the outer position.

  The developing electrode 65 receives electric power via the main body electrode 117 during the image forming operation described above, and the developing coupling 44 receives driving force via the main body coupling 116.

  The electric power received by the developing electrode 65 is transmitted to the developing roller shaft 111 and the supply roller shaft 121 via the support member 67.

  Further, when receiving the driving force, the developing coupling 44 rotates clockwise as viewed from the left side as shown in FIG. 15B. Then, the developing gear 45 rotates counterclockwise as viewed from the left side. As a result, the developing roller 11 rotates counterclockwise as viewed from the left side.

Further, as shown in FIG. 16B, the first idle gear 70 rotates clockwise as viewed from the right side. Then, the second idle gear 71 rotates counterclockwise when viewed from the right side, and the supply gear 72 rotates clockwise when viewed from the right side. Thereby, the supply roller 12 rotates clockwise in the right side view, in other words, counterclockwise in the left side view. That is, the supply roller 12 rotates in the direction opposite to the development coupling 44.
5. Correspondence with Claims In this embodiment, the left-right direction is an example of the first direction, the front-rear direction is an example of the second direction, and the up-down direction is an example of the third direction. The left side is an example of one side in the first direction, and the right side is an example of the other side in the first direction. Further, the front is an example of one side in the second direction, and the rear is an example of the other side in the second direction. The upper part is an example of one side in the third direction, and the lower part is an example of the other side in the third direction.

  The right wall 27R of the frame 21 is an example of a first wall. The left wall 27L of the frame 21 is an example of a second wall.

  The central axis A2 of the supply roller 12 is an example of a first axis. The supply roller shaft 121 is an example of a shaft.

  The development coupling 44 is an example of a coupling. The left end edge 44A of the coupling 44 is an example of a first end portion. The recess 48 is an example of a recess.

The supply gear 72 is an example of a first transmission unit. The developing gear 45, the developing roller shaft 111, the first idle gear 70, and the second idle gear 71 constitute a second transmission unit. The supply gear 72, the development gear 45, the development roller shaft 111, the first idle gear 70, and the second idle gear 71 constitute a transmission mechanism.
6). Action and Effect (1) In the developing cartridge 7A, the developing coupling 44 is disposed at a position where the center of rotation C overlaps the center axis A2 of the supply roller 12, as shown in FIG.

  Therefore, the development cartridge 7A can be downsized.

  In the developing cartridge 7A, the developing coupling 44 rotates in the opposite direction to the supply roller 12, as shown in FIGS. 15B and 16B.

  Therefore, the direction of the moment applied to the developing cartridge 7A due to the rotation of the developing coupling 44 is opposite to the direction of the moment applied to the developing cartridge 7A due to the rotation of the supply roller 12.

  As a result, the moment applied to the developing cartridge 7A due to the rotation of the developing coupling 44 is canceled by the moment applied to the developing cartridge 7A due to the rotation of the supply roller 12.

As a result, the developing cartridge 7A can stabilize the posture of the developing cartridge 7A in the main body casing 2.
(2) In the developing cartridge 7A, as shown in FIGS. 15B and 16B, the driving force received by the developing coupling 44 is the developing gear 45, the developing roller shaft 111, the first idle gear 70, and the second idle gear 71. Then, the toner is transmitted to the supply roller 12 via the supply gear 72 sequentially.

Therefore, the driving force received by the development coupling 44 can be reliably transmitted to the supply roller 12 with a simple configuration.
(3) In the developing cartridge 7A, as shown in FIGS. 6 and 12, the supply gear 72 is disposed on the right wall 27R, and the developing coupling 44 is disposed on the left wall 27L.

  Therefore, the areas of the right wall 27R and the left wall 27L can be reduced as compared with the configuration in which the development coupling 44 and the supply gear 72 are provided on either the right wall 27R or the left wall 27L.

As a result, the developing cartridge 7A can be downsized.
(4) In the developing cartridge 7, as shown in FIG. 14, the developing coupling 44 is supported by the supply roller shaft 121 so as to be relatively rotatable.

  Therefore, the developing coupling 44 can be supported using the supply roller shaft 121.

As a result, the driving force received by the development coupling 44 can be reliably transmitted to the supply roller 12.
(5) In the developing cartridge 7A, the developing coupling 44 includes a recess 48 that is recessed from the left end portion to the right as shown in FIG. In other words, the concave portion 48 extends in the direction opposite to the moving direction from the inner position to the outer position of the developing coupling 44 from the end in the moving direction from the inner position to the outer position of the developing coupling 44. It is recessed.

Therefore, it is possible to suppress the development coupling 44 from being damaged as compared with the case where the development coupling 44 has a protruding portion.
7). Second Embodiment A second embodiment of the developing cartridge of the present invention will be described with reference to FIGS. Note that in the second embodiment, the same members as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.
(1) Overview of Second Embodiment In the first embodiment described above, the development coupling 44 is moved by the left linear cam 38 and the developing electrode 65 is moved to the right linear cam 68 by the movement of the handle member 101. Move by.

  On the other hand, in the second embodiment, as shown in FIGS. 22A and 22B, the developing electrode 65 is moved by the right link mechanism 131 when the slide member 133 moves. Further, as shown in FIGS. 23A and 23B, the development coupling 44 is moved by the left link mechanism 132 when the slide member 135 is separately moved.

In the second embodiment, the development coupling 44 is moved by the left link mechanism 132 after the development electrode 65 is moved by the right link mechanism 131.
(2) Configuration of Second Embodiment The developing cartridge 7B includes a right link mechanism 131 and a left link mechanism 132.
(2-1) Right Link Mechanism The right link mechanism 131 has a first position (see FIG. 22A) where the developing electrode 65 is positioned in the inward position and a second position (see FIG. 22B) where the developing electrode 65 is positioned in the outward position. Reference) is configured to move between. As shown in FIG. 22A, the right link mechanism 131 includes a slide member 133 and a link member 134.

  The slide member 133 is disposed in front of the left end portion of the protrusion 74. The slide member 133 has a substantially flat plate shape that is long in the front-rear direction. The slide member 133 is supported on the right wall 27R of the frame 21 so as to be slidable in the front-rear direction. The slide member 133 includes an operation unit 133A.

  The operation portion 133A extends rightward from the front end portion of the slide member 133. The operation unit 133A has a substantially flat plate shape.

  The link member 134 includes an upper link member 134A and a lower link member 134B.

  The upper link member 134A has a substantially flat plate shape that is long in the front-rear direction. The front end portion of the upper link member 134A is rotatably connected to the upper end portion of the rear end portion of the slide member 133. The rear end portion of the upper link member 134A is rotatably connected to the contact portion 93 above the developing electrode 65.

The lower link member 134B has a substantially flat plate shape that is long in the front-rear direction. The front end portion of the lower link member 134B is rotatably connected to the lower end portion of the rear end portion of the slide member 133. A rear end portion of the lower link member 134B is rotatably connected to a contact portion 93 below the developing electrode 65. In the second embodiment, the contact portion 93 of the developing electrode 65 has a substantially cylindrical shape.
(2-2) Left Link Mechanism The left link mechanism 132 has a third position (see FIG. 23A) where the developing coupling 44 is positioned in the inward position, and a fourth position (where the developing coupling 44 is positioned in the outward position). It can move between (refer FIG. 23B). As shown in FIGS. 23A and 24, the left link mechanism 132 includes a bearing member 36, a support member 137, a slide member 135, a link member 136, and a connecting member 138.

  The bearing member 36 includes a pair of guide portions 140.

  Each of the pair of guide portions 140 is disposed at the lower end portion of the bearing member 36. Each of the pair of guide portions 140 is arranged at a distance from each other in the front-rear direction. The interval is slightly longer than the length in the front-rear direction of the connecting member 138 described later. The guide part 140 extends from the left surface of the bearing member 36 toward the left. Each of the pair of guide portions 140 has a substantially prismatic shape.

  The support member 137 is disposed on the right side of the development coupling 44. The support member 137 has a substantially cylindrical shape extending in the left-right direction. The inner diameter of the support member 137 is slightly larger than the outer diameter of the supply roller shaft 121. The support member 137 is supported by the left end portion of the supply roller shaft 121. The support member 137 can rotate relative to the supply roller shaft 121. Further, the support member 137 includes a protrusion 139.

  The protrusion 139 includes an upper protrusion 139A and a lower protrusion 139B.

  The upper protrusion 139 </ b> A extends upward from the upper end portion of the support member 137. The upper protrusion 139A has a substantially cylindrical shape.

  The lower protrusion 139 </ b> B extends downward from the lower end of the support member 137. The lower protrusion 139B has a substantially cylindrical shape having a longer vertical length than the upper protrusion 139A.

  The slide member 135 is disposed in front of the supply roller shaft 121. The slide member 135 has a substantially flat plate shape that is long in the front-rear direction. The slide member 135 is supported on the left wall 27L of the frame 21 so as to be slidable in the front-rear direction. The slide member 135 includes an operation unit 135A.

  The operation portion 135A extends to the left from the front end portion of the slide member 135. The operation unit 135A has a substantially flat plate shape.

  The link member 136 includes an upper link member 136A and a lower link member 136B.

  The upper link member 136A has a substantially flat plate shape that is long in the front-rear direction. The front end portion of the upper link member 136A is rotatably connected to the upper end portion of the rear end portion of the slide member 135. The rear end portion of the upper link member 136A is rotatably connected to a protrusion 139A above the support member 137.

  The lower link member 136B has a substantially flat plate shape that is long in the front-rear direction. The front end portion of the lower link member 136B is rotatably connected to the lower end portion of the rear end portion of the slide member 135. A rear end portion of the lower link member 136B is rotatably connected to a protrusion 139B below the support member 137.

  The connecting member 138 is disposed below the development coupling 44 and the support member 137. The connecting member 138 includes a main body portion 138A and an engaging portion 138B.

  The main body 138A has a substantially flat plate shape extending in the left-right direction. The right end of the main body 138A is rotatably connected to a protrusion 139B below the support member 137 below the lower link member 136B. The main body 138A is disposed between the pair of guides 140 so as to be slidable in the vertical direction.

The engaging portion 138B protrudes upward from the left end portion of the main body portion 138A. The engaging portion 138B extends in the front-rear direction. The engaging portion 138 </ b> B is disposed on the left side of the gear portion 46 of the developing coupling 44.
(3) Advance or Retreat of Development Coupling and Development Electrode Next, the movement of the development coupling 44 and the development electrode 65 from the inward position to the outward position will be described.

  First, the operation portion 133A of the slide member 133 receives a force from the outside of the developing cartridge 7B.

  Then, as shown in FIGS. 22A and 22B, the slide member 133 moves rearward toward the protrusion 74.

  Then, as shown in FIG. 22B, the link member 134 rotates so that its rear end portion moves rightward with its front end portion as a fulcrum. Thereafter, the link member 134 is positioned so as to incline to the right as it goes rearward.

  The developing electrode 65 moves to the right while being guided by each of the pair of grooves 76 and is located at the outer position. Thereby, the movement of the developing electrode from the inner position to the outer position is completed.

  Thereafter, the operation unit 135A of the slide member 135 receives a force from the outside of the developing cartridge 7B.

  Then, as shown in FIGS. 23A and 23B, the slide member 135 moves rearward toward the supply roller shaft 121.

  As shown in FIG. 23B, the link member 136 rotates so that its rear end moves leftward with its front end as a fulcrum. Thereafter, the link member 136 is positioned so as to incline to the left as it goes rearward.

  As a result, the support member 137 and the development coupling 44 move integrally to the left while being guided by the supply roller shaft 121. Then, the development coupling 44 is located at the outward position. Thereby, the movement of the developing coupling 44 from the inner position to the outer position is completed.

  Next, the movement of the development coupling 44 and the development electrode 65 from the outer position to the inner position will be described.

  First, the operation portion 133A of the slide member 133 receives a force from the outside of the developing cartridge 7B.

  Then, the slide member 133 moves forward away from the protrusion 74 as shown in FIGS. 22A and 22B.

  As shown in FIG. 22A, the link member 134 rotates so that its rear end portion moves to the left with its front end portion as a fulcrum. Thereafter, the link member 134 tilts along the front-rear direction.

  As a result, the developing electrode 65 moves to the left while being guided by each of the pair of grooves 76 and is positioned at the inward position. Thereby, the movement of the developing electrode 65 from the outer position to the inner position is completed.

  The operation unit 135A of the slide member 135 receives a force from the outside of the developing cartridge 7B.

  Then, the slide member 135 moves forward away from the supply roller shaft 121 as shown in FIGS. 23A and 23B.

  Then, as shown in FIG. 23A, the link member 136 rotates so that its rear end portion moves rightward with its front end portion as a fulcrum. The link member 136 tilts along the front-rear direction.

  The support member 137 and the development coupling 44 move integrally to the right while being guided by the supply roller shaft 121. Then, the development coupling 44 is located at the inward position. Thereby, the movement of the developing coupling 44 from the outer position to the inner position is completed.

In the above description of the second embodiment, the development coupling 44 is moved from the inner position to the outer position after the development electrode 65 moves from the inner position to the outer position or from the outer position to the inner position. Although it moved from the outward position to the inward position, the present invention is not limited to this. For example, the development coupling 44 may move before the development electrode 65 moves.
(4) Effects of Second Embodiment Also in the second embodiment, the same functions and effects as those of the first embodiment described above can be obtained.
8). Third Embodiment A third embodiment of the developing cartridge of the present invention will be described with reference to FIGS. Note that in the third embodiment, members similar to those in the first embodiment described above are denoted by the same reference numerals, and descriptions thereof are omitted.
(1) Overview of Third Embodiment In the first embodiment described above, the supply gear 72 is disposed on the right side of the right wall 27 </ b> R of the frame 21. The driving force received by the development coupling 44 is transmitted to the supply gear 72 via the development gear 45, the development roller shaft 111, the first idle gear 70, and the second idle gear 71 in this order.

On the other hand, in the third embodiment, the supply gear 159 is arranged on the left side of the left wall 27L of the frame 21 as shown in FIGS. The driving force received by the development coupling 156 is transmitted to the supply gear 159 via the development gear 157 and the idle gear 158 in order.
(2) Configuration of Third Embodiment The developing cartridge 7 </ b> C includes a drive unit 151.
(2-1) Drive Unit The drive unit 151 includes a bearing member 152, a gear train 153, and a left interlocking mechanism 154, as shown in FIGS.
(2-2) Bearing member Unlike the bearing member 36 of the first embodiment, the bearing member 152 does not have the guide rib 43 and includes the protrusion 155.

The protrusion 155 is disposed approximately at the center in the front-rear direction and approximately at the center in the up-down direction of the bearing member 152. The protrusion 155 extends from the left surface of the bearing member 152 toward the left. The protrusion 155 is configured to support an idle gear 158 described later. The protrusion 155 has a substantially cylindrical shape.
(2-3) Gear Train The gear train 153 includes a developing gear 157, an idle gear 158, a supply gear 159, a support member 169, and a developing coupling 156.
(2-3-1) Development Gear The development gear 157 has a substantially cylindrical shape that is longer in the left-right direction than the development gear 45 of the first embodiment.
(2-3-2) Idle Gear The idle gear 158 has a substantially disc shape having a thickness in the left-right direction, and has gear teeth over the entire peripheral surface thereof. The idle gear 158 has a through hole 158A having a substantially circular shape in a side view at the center in the radial direction.

The idle gear 158 is supported by the protrusion 155 by the protrusion 155 of the bearing member 152 being fitted in the through hole 158A. The idle gear 158 can rotate relative to the protrusion 155. The idle gear 158 meshes with the right end portion of the developing gear 157.
(2-3-3) Supply Gear The supply gear 159 has a substantially disc shape having a thickness in the left-right direction, and has gear teeth over the entire peripheral surface thereof. The supply gear 159 has a substantially D-shaped through hole 159A in a side view in the radial direction.

The supply gear 159 is supported by the support portion 121 </ b> A by the left support portion 121 </ b> A of the supply roller shaft 121 being fitted in the through hole 159 </ b> A of the supply gear 159. The supply gear 159 cannot rotate relative to the supply roller shaft 121 and can rotate with the supply roller shaft 121. Supply gear 159 meshes with idle gear 158.
(2-3-4) Support Member As shown in FIGS. 26 and 29, the support member 169 is disposed on the left side of the supply gear 159. The support member 169 has a flat plate shape that is substantially rectangular in a side view. The support member 169 is fixed to the left wall 27 </ b> L of the frame 21 with a screw 187. The support member 169 is disposed on the right side of the supply gear 159. The support member 169 has a protrusion 171 and a hole 170.

  The protrusion 171 is disposed below the support member 169. The protrusion 171 protrudes leftward from the left surface of the support member 169. The protrusion 171 has a substantially cylindrical shape. The protrusion 171 is configured such that the development coupling 156 rotates relative to the protrusion 171.

The hole 170 is a recess that is recessed leftward from the right surface of the support member 169. The shape of the hole 170 is substantially circular when viewed from the side. The center of the hole 170 coincides with the central axis of the protrusion 171. In other words, the center of the hole 170 coincides with the central axis A <b> 2 of the supply roller shaft 121.
(2-3-5) Development Coupling The rotation center C of the development coupling 156 coincides with the central axis A2 of the supply roller shaft 121. The development coupling 156 includes a gear member 160, a coupling member 161, and a compression spring 162.

  As shown in FIG. 29, the gear member 160 is supported by the protrusion 171 so as not to move in the left-right direction.

The gear member 160 is disposed at the right end portion of the development coupling 156. The gear member 160 meshes with the left end portion of the developing gear 157. The gear member 160 includes a gear part 163 and an engaging part 164.
(2-3-5-1) Gear portion The gear portion 163 has a substantially cylindrical shape with the right end portion closed, and has gear teeth over the entire peripheral surface thereof. The gear portion 163 has a hole 165.

The hole 165 is disposed at the center in the radial direction of the right wall of the gear portion 163. The hole 165 penetrates the right wall of the gear part 163 in the left-right direction. The hole 165 has a substantially circular shape in side view. The diameter of the hole 165 is slightly larger than the outer diameter of the protrusion 171.
(2-3-5-2) Engaging portion The engaging portion 164 extends leftward from the peripheral edge of the hole 165. The engaging portion 164 has a substantially cylindrical shape with the left end portion closed. The inner diameter of the engaging portion 164 is the same as that of the hole 165. The outer diameter of the engaging portion 164 is smaller than the inner diameter of the gear portion 163. The peripheral wall of the engaging part 164 is arranged at a distance from the peripheral wall of the gear part 163 in the radial direction of the gear part 163. The engaging portion 164 includes a pair of protrusions 166.

The pair of protrusions 166 is disposed at the left end portion of the engaging portion 164. Each of the pair of protrusions 166 is arranged at an interval of 180 ° from each other in the circumferential direction of the engaging portion 164. Each of the pair of protrusions 166 extends radially outward from the peripheral surface of the engaging portion 164. Each of the pair of protrusions 166 has a substantially cylindrical shape.
(2-3-6) Coupling member The coupling member 161 is configured to move along the left-right direction between an inward position (see FIG. 25) and an outward position (see FIG. 28). ing. More specifically, as shown in FIGS. 26 and 29, the coupling member 161 is supported so as not to rotate relative to the gear member 160 and to be slidable in the left-right direction.

  The coupling member 161 is disposed at the left end portion of the development coupling 156. The coupling member 161 has a substantially cylindrical shape extending in the left-right direction and closed at the left end. The coupling member 161 includes a pair of engaging portions 167 and a flange portion 168.

  Each of the pair of engaging portions 167 extends from the right end portion of the coupling member 161 toward the right. Each of the pair of engaging portions 167 is arranged at an interval of 180 ° from each other in the circumferential direction of the coupling member 161. Each of the pair of engaging portions 167 has a substantially prismatic shape. Each of the pair of engaging portions 167 has a concave groove (not shown) so as to be recessed leftward from the right end edge 167A of the engaging portion 167. Each of the pair of engaging portions 167 is configured to receive the protrusion 166.

The flange portion 168 is disposed on the outer peripheral surface of the right end portion of the coupling member 161. The flange portion 168 protrudes in the radial direction of the coupling member 161 and extends in the circumferential direction of the coupling member 161.
(2-3-7) Compression Spring The compression spring 162 is a coil spring that extends in the left-right direction. The left end portion of the compression spring 162 is in contact with the right surface of the flange portion 168. The right end portion of the compression spring 162 is in contact with the left surface of the right wall of the gear member 160. Thereby, the compression spring 162 always urges the coupling member 161 toward the left.
(2-4) Left interlocking mechanism The left interlocking mechanism 154 includes a slide member 172 and a cam member 173, as shown in FIGS.
(2-4-1) Slide Member The slide member 172 is disposed on the left side of the front end portion of the frame 21. As shown in FIGS. 26 and 27, the slide member 172 has a flat plate shape that is substantially rectangular in a side view. The slide member 172 includes a contact part 175 and a connecting part 174.

  The contact portion 175 is disposed at the front end portion of the slide member 172. The contact part 175 has a substantially rectangular shape in side view. The contact portion 175 has a hole 176 and a protrusion 177.

  The hole 176 is disposed substantially at the center of the contact portion 175 in the front-rear direction. The hole 176 has a substantially rectangular shape in side view extending in the vertical direction. The hole 176 is configured to penetrate the protrusion 105 of the handle member 101. Thereby, the slide member 172 can be interlocked with the handle member 101.

  The protrusion 177 is disposed at the upper end portion of the rear inner peripheral surface of the hole 176. The protrusion 177 protrudes forward from the rear inner peripheral surface of the hole 176. The protrusion 177 has a substantially semicircular shape when viewed from the side.

  The connecting portion 174 continuously extends rearward from the upper end portion of the rear end portion of the contact portion 175. The connecting portion 174 has a substantially rectangular shape in side view that is long in the front-rear direction. The connecting portion 174 has an inclined hole 178.

The inclined hole 178 is disposed at the rear end portion of the connecting portion 174. The inclined hole 178 penetrates the connecting portion 174 in the left-right direction. The inclined hole 178 is a long hole extending in a direction connecting the rear lower part and the front upper part.
(2-4-2) Cam Member The cam member 173 is disposed behind the slide member 172. The cam member 173 is configured to interlock with the slide member 172. The cam member 173 is supported by the protrusion 186 of the frame 21 so as to be swingable with respect to the frame 21. The cam member 173 moves between a pressing position for pressing the coupling member 161 to the right (see FIG. 25) and a pressing release position for releasing the rightward pressing on the coupling member 161 (see FIG. 28). Is configured to do. The cam member 173 has a flat plate shape that extends in the up-down direction and has a substantially fan-shaped side view in the left-right direction. The cam member 173 includes a hole 181, a contact portion 179, and a connecting portion 180.

  The hole 181 is disposed at the upper end of the cam member 173. The hole 181 passes through the cam member 173 in the left-right direction. The hole 181 has a substantially circular shape in side view. The hole 181 is configured so that the protrusion 186 of the frame 21 can be relatively rotated.

  The contact portion 179 is disposed at the lower end portion of the cam member 173. The contact part 179 includes a groove 182, a displacement part 183, and a holding part 184.

  The groove 182 is cut out from the rear end portion of the cam member 173 toward the front lower side. The groove 182 has a substantially arc shape with the center of the hole 181 as the center. The groove width of the groove 182 is slightly wider than the outer diameter of the coupling member 161 and slightly smaller than the outer diameter of the flange portion 168.

  The displacement part 183 extends rightward from a peripheral part in the middle of the groove 182 in the front-rear direction. The right surface of the displacement portion 183 is inclined rightward from the rear toward the front. In other words, the projecting length of the displacement portion 183 gradually increases from the rear toward the front.

  The holding part 184 is continuous in front of the displacement part 183. The right surface of the holding portion 184 is continuous with the front end portion of the right surface of the displacement portion 183 and extends forward.

  The connecting portion 180 extends forward from the upper end portion of the cam member 173. The connecting part 180 has a substantially prismatic shape. The connecting portion 180 includes a protrusion 185.

The protrusion 185 is disposed in front of the connecting portion 180. The protrusion 185 extends leftward from the left surface of the connecting portion 180. The protrusion 185 has a substantially cylindrical shape. The protrusion 185 is slidably engaged in the inclined hole 178 of the slide member 172.
(3) Advance or Retreat of Coupling Member Next, the movement of the coupling member 161 from the inward position to the outward position will be described with reference to FIGS. 27 and 28.

  When the coupling member 161 is moved from the inward position to the outward position, the handle member 101 is tilted from the extended position (see FIG. 27A) as shown in FIG. 27, as in the first embodiment described above. (See FIG. 27B).

  Then, the protrusion 105A of the handle member 101 presses the rear inner peripheral surface of the hole 176 rearward while moving in the clockwise direction in the left side view with the rear end portion of the handle member 101 as a fulcrum.

  As a result, the slide member 172 moves backward. Then, the protrusion 185 of the cam member 173 moves upward along the inclination of the inclined hole 178. Thereafter, the protrusion 185 of the cam member 173 is positioned at the front end of the inclined hole 178 of the slide member 172.

  As a result, the cam member 173 swings counterclockwise as viewed from the left side with the upper end portion as a fulcrum. Then, the coupling member 161 moves to the left by the urging force of the compression spring 162 along the inclination of the displacement portion 183 of the cam member 173. Thereafter, the displacement portion 183 of the cam member 173 is released from contact with the flange portion 168 of the coupling member 161.

  As shown in FIG. 27B, the handle member 101 is positioned at the tilted position when the protrusion 105 </ b> A gets over the protrusion 177 and is disposed above the protrusion 177.

  Then, the cam member 173 is located at the pressing release position, and the coupling member 161 is located at the outward position by the urging force of the compression spring 162. Thereby, the movement of the coupling member 161 from the inner position to the outer position is completed.

  Next, the movement of the coupling member 161 from the outer position to the inner position will be described.

  First, as in the first embodiment described above, as shown in FIG. 27, the handle member 101 moves from the tilted position (see FIG. 27B) to the extended position (see FIG. 27A).

  Then, the protrusion 105A of the handle member 101 presses the front inner peripheral surface of the hole 176 forward while moving in the counterclockwise direction when viewed from the left side with the rear end portion of the handle member 101 as a fulcrum.

  As a result, the slide member 172 is pressed by the protrusion 105A and moves forward. Then, the protrusion 185 of the cam member 173 moves downward along the inclination of the inclined hole 178.

  As a result, the cam member 173 swings clockwise in the left side view with the upper end portion as a fulcrum. Then, the coupling member 161 comes into contact with the displacement portion 183 of the cam member 173, and moves to the right along the inclination of the displacement portion 183 while resisting the biasing force of the compression spring 162.

As shown in FIG. 27A, when the handle member 101 is in the tilted position, the cam member 173 is positioned in the pressing position, and the coupling member 161 is in the inward position against the urging force of the compression spring 162. To position.
(4) Driving of Developing Cartridge Next, a state when the coupling member 161 receives a driving force from the driving source of the main casing 2 will be described.

  When the coupling member 161 receives the driving force, the gear member 160 rotates together with the coupling member 161 in the clockwise direction as shown in FIGS. 28 and 30. Then, the developing gear 157 rotates counterclockwise as viewed from the left side. As a result, the developing roller 11 rotates counterclockwise as viewed from the left side.

When the developing gear 157 rotates counterclockwise when viewed from the left side, the idle gear 158 rotates clockwise when viewed from the left side, and the supply gear 159 rotates counterclockwise when viewed from the left side. Thereby, the supply roller 12 rotates counterclockwise as viewed from the left side. That is, the supply roller 12 rotates in the opposite direction to the coupling member 161.
(5) Correspondence with Claims In the third embodiment, the left wall 27L is an example of a first wall.

  The coupling member 161 is an example of a coupling.

  The coupling support member 169 is an example of a support member. The coupling support boss 171 is an example of a support part.

The supply gear 159 is an example of a first transmission unit. The development gear 157 is an example of a third transmission unit. The idle gear 158 is an example of a fourth transmission unit. The development gear 157 and the idle gear 158 constitute a second transmission unit. The supply gear 159, the development gear 157, and the idle gear 158 constitute a transmission mechanism.
(6) Operational Effects of Third Embodiment (6-1) In the third embodiment, as shown in FIG. 30, the driving force received by the coupling member 161 with a simple configuration is applied to the developing gear 157 and the idle gear. 158 can be sequentially transmitted to the supply gear 159.
(6-2) In the third embodiment, as shown in FIGS. 26 and 28, the development coupling 44, the supply gear 159, the development gear 157, and the idle gear 158 are arranged on the left wall 27L.

  That is, the development coupling 44, the supply gear 159, the development gear 157, and the idle gear 158 can be concentrated on the left wall 27L.

  Therefore, a configuration for transmitting the driving force from the development coupling 44 to the supply roller 12 can be disposed on the left wall 27L, and another configuration can be provided on the right wall 27R.

As a result, the right wall 27R can be utilized more.
(6-3) In the third embodiment, as shown in FIGS. 25 and 26, the development coupling 44 is supported by the coupling support boss 171 of the coupling support member 169.

  Therefore, the development coupling 44 can be supported using the coupling support member 169 that supports the supply roller shaft 121.

As a result, the number of parts can be reduced as compared with the case where the developing coupling 44 is supported by a member other than the supply roller shaft 121 and the coupling support member 169.
(6-4) In the third embodiment, as shown in FIG. 29, the developing gear 157 moves from the lower side to the upper side due to the moment F1 caused by the rotation of the gear member 160 at the meshing portion with the gear member 160. Pressed.

  Here, the developing gear 157 also meshes with the idle gear 158 on the upper side of the meshing portion with the gear member 160. That is, the developing gear 157 receives the reaction force F <b> 2 from the idle gear 158 at the meshing portion with the idle gear 158.

  Thereby, the moment F1 from the gear member 160 can be canceled by the reaction force F2 from the idle gear 158.

As a result, rattling of the developing gear 157 due to the moment F1 from the gear member 160 can be suppressed, and the developing gear 157 can be stably rotated.
(6-5) Also in the third embodiment, it is possible to obtain the same effects as those in the first embodiment.
(7) Modification of Third Embodiment In the third embodiment described above, the development coupling 156 is supported by the left wall 27L via the support member 169 disposed on the left side of the supply gear 159. However, the form for supporting the development coupling 156 is not particularly limited. For example, as shown in FIG. 31, the left end portion of the supply roller shaft 121 may be configured to support the developing coupling 156 so as to be rotatable relative to the supply roller shaft 121.

Further, in the third embodiment described above, the supply roller 12 is configured to rotate in the direction opposite to the coupling member 151 by the developing gear 157 and one idle gear 158, but for example, three idle gears, An odd number such as five may be arranged, and an even number such as two or four idle gears may be arranged between the developing gear 157 and the gear member 160. Even in such a configuration, the same effect as in the third embodiment can be obtained.
9. Fourth Embodiment A fourth embodiment of the developing cartridge of the present invention will be described with reference to FIGS. Note that in the fourth embodiment, members similar to those of the third embodiment described above are denoted by the same reference numerals, and descriptions thereof are omitted.
(1) Overview of Fourth Embodiment In the third embodiment described above, the driving force input to the development coupling 156 is transmitted to the supply gear 159 via the development gear 157 and the idle gear 158.

On the other hand, in the fourth embodiment, as shown in FIG. 32, the driving force input to the development coupling 156 is transmitted to the supply gear 159 via the idle gear 271 having the bevel teeth 271A.
(2) Configuration of Fourth Embodiment The developing cartridge 7 </ b> D includes a gear train 270.
(2-1) Gear Train The gear train 270 includes a supply gear 273, an idle gear 271, a support member 274, and a developing coupling 275, as shown in FIGS. 32, 33, and 34.
(2-1-1) Supply Gear The supply gear 273 has a substantially disk shape having a thickness in the left-right direction. The supply gear 273 is supported by the support portion 121 </ b> A of the supply roller shaft 121 so as not to rotate relative to the supply roller shaft 121. The supply gear 273 has a through hole 273A and a bevel tooth 273B.

  The through hole 273A is arranged at the radial center of the supply gear 273. The through hole 273A has a substantially D shape when viewed from the side, and penetrates the supply gear 273 in the left-right direction. The through hole 273A is configured so that the support portion 121A of the supply roller shaft 121 fits.

The bevel tooth 273 </ b> B is inclined radially inward as it goes leftward over the entire peripheral edge of the left end portion of the supply gear 273.
(2-1-2) Idle Gear The idle gear 271 has a substantially disk shape having a thickness in the front-rear direction. The idle gear 271 includes bevel teeth 271A that incline radially inward toward the rear over the entire periphery of the rear end.

The idle gear 271 is rotatably supported by a projection (not shown) extending rearward from the rear surface of the substantially prismatic idle gear support portion 279 protruding leftward from the left surface of the frame 21. The idle gear 271 meshes with the front of the supply gear 273.
(2-1-3) Support Member The support member 274 is disposed on the left side of the supply gear 273 as shown in FIGS. The support member 274 has a substantially cylindrical shape extending in the left-right direction. The support member 274 has a hole 278.

The hole 278 is disposed at the radial center of the support member 274. The hole 278 is a recess that is recessed leftward from the right surface of the support member 274. The hole 278 has a substantially D shape when viewed from the side. The hole 278 is configured such that the support portion 121A of the supply roller shaft 121 is fitted.
(2-1-4) Development Coupling The development coupling 275 is configured in the same manner as the development coupling 156 of the third embodiment except that a bevel tooth 276A is formed on the gear portion 276. Also in the development coupling 275 of the fourth embodiment, the coupling member 161 is moved to the inner position by the left interlocking mechanism 154 similar to the third embodiment described above, and the outer position indicated by the phantom line in FIG. Moved to.

The gear portion 276 includes a bevel tooth 276A that is inclined radially inward as it goes rightward over the entire peripheral edge portion of the right end portion, and a flat tooth 276B over the entire peripheral surface thereof. The gear portion 276 meshes with the upper end portion of the idle gear 271 from the front at the bevel teeth 276A, and meshes with the front of the developing gear 157 at the flat teeth 276B.
(3) Driving of Developing Cartridge Next, a state when the coupling member 161 receives a driving force from the driving source of the main casing 2 will be described.

  When the coupling member 161 receives a driving force, the gear member 160 rotates together with the coupling member 161 in the clockwise direction as shown in FIG. Then, the developing gear 157 rotates counterclockwise as viewed from the left side. As a result, the developing roller 11 rotates counterclockwise as viewed from the left side.

Further, when the gear member 160 rotates clockwise in the left side view, the idle gear 271 rotates in the clockwise direction in the rear side view, and the supply gear 159 rotates in the counterclockwise direction in the left side view. Thereby, the supply roller 12 rotates counterclockwise as viewed from the left side. That is, the supply roller 12 rotates in the opposite direction to the coupling member 161.
(4) Correspondence with Claims In the fourth embodiment, the supply gear 273 is an example of a first transmission unit. The idle gear 271 is an example of a third transmission unit. The idle gear 271 also serves as the second transmission unit. Further, the supply gear 273 and the idle gear 271 constitute a transmission mechanism.

The coupling support member 274 is an example of a support member. The coupling support member 274 also serves as a support portion.
(5) Operational effect of the fourth embodiment (5-1) In the fourth embodiment, as shown in FIG. 31, the driving force received by the coupling member 161 is passed through the idle gear 271 in order with a simple configuration. Can be transmitted to the supply gear 273.
(5-2) Also in the fourth embodiment, the same operational effects as those of the third embodiment described above can be obtained.
10. Fifth Embodiment With reference to FIGS. 35 to 41, a fifth embodiment of the developing cartridge of the present invention will be described. Note that in the fifth embodiment, members similar to those in the first embodiment described above are denoted by the same reference numerals, and descriptions thereof are omitted.
(1) Overview of Fifth Embodiment In the first embodiment described above, the developing electrode 65 is disposed on the right wall 27 </ b> R of the frame 21.

On the other hand, in the fifth embodiment, the developing electrode 194 is disposed on the left wall 27L of the frame 21.
(2) Configuration of Fifth Embodiment The developing cartridge 7E includes a drive unit 191.

As shown in FIGS. 35 and 36, the drive unit 191 includes a bearing member 192, a developing electrode 194, a first gear train 193, a linear cam 195, a cover 196, a compression spring 188, and a compression spring 39. And.
(2-1) Bearing Member As shown in FIGS. 36 and 37, the bearing member 192 includes an upper guide rib 43 </ b> A, a lower guide rib 197, and a protrusion 198, unlike the bearing member 36 of the first embodiment. . The bearing member 192 is made of a conductive material such as a conductive resin.

  The lower guide rib 197 is disposed at the lower end portion of the bearing member 192 with a space below the upper guide rib 43A. The lower guide rib 197 protrudes leftward from the left surface of the bearing member 192 and extends in the front-rear direction. The front end portion of the lower guide rib 197 is disposed at the front end portion of the bearing member 192. The rear end portion of the lower guide rib 197 is disposed at the rear end portion of the bearing member 192.

  The protrusion 198 is disposed between the upper guide rib 43A and the lower guide rib 197 above the developing coupling 44 and behind the first idle gear 202 described later. The protrusion 198 extends leftward from the left surface of the bearing member 192. The protrusion 198 has a substantially cylindrical shape whose left end is closed. Note that the right end portion of the protrusion 198 passes through the bearing member 192 in the left-right direction and is opened toward the right. The protrusion 198 has a groove 199.

The groove 199 is cut away from the left end portion of the protrusion 198 toward the right so as to penetrate the protrusion 198 in the vertical direction. The groove 199 has a substantially straight line shape in plan view with the left end opened.
(2-2) Development Electrode The development electrode 194 is disposed in the groove 199. The developing electrode 194 has a substantially T shape when viewed from the front. The developing electrode 194 is configured to move in an inward position (see FIG. 35) and an outward position (see FIG. 41) along the left-right direction while being guided by the groove 199. The moving distance D3 from the inner position to the outer position of the developing electrode 194 is, for example, 5 mm or more and 30 mm or less. The developing electrode 194 includes a contact portion 189 and a contact portion 190.

  The contact portion 189 is disposed at the right end portion of the developing electrode 194. The contact portion 189 has a substantially prismatic shape extending in the vertical direction. The upper end portion of the contact portion 189 protrudes upward from the upper end portion of the protrusion 198. The lower end portion of the contact portion 189 protrudes downward from the lower end portion of the protrusion 198.

  The contact portion 190 extends leftward from the center of the contact portion 189 in the vertical direction. The contact portion 190 has a substantially cylindrical shape that is long in the left-right direction. The contact portion 190 protrudes leftward from the left end portion of the protrusion 198. More specifically, the contact portion 190 includes a contact portion between the development coupling 44 and a first idle gear 202 to be described later, a common tangent L between the development coupling 44 and a first idle gear 202 to be described later, and development. Arranged in a region surrounded by the peripheral surface of the coupling 44 and the peripheral surface of the first idle gear 202 described later. The contact part 190 has a contact 190A at the left end.

The contact 190 </ b> A is disposed in a hole 208 (described later) of the cover 196 when the developing electrode 194 is located at the inward position. As shown in FIG. 37A, the contact 190 </ b> A is located at a position in the left-right direction that is substantially the same as the left surface of the left collar 49 when the developing electrode 194 is located at the inner position. When the developing electrode 194 is located at the outward position, the contact 190A is located on the left side of the left surface of the cover 196 as shown in FIG. 37B. In other words, the outward position of the developing electrode 194 is positioned outward in the left-right direction relative to the inward position of the developing electrode 194.
(2-3) First Gear Train The first gear train 193 includes an agitator gear 200 and an idle gear train 201 in addition to the development coupling 44 and the development gear 45, as shown in FIG.
(2-3-1) Agitator gear The agitator gear 200 has a substantially disc shape extending in the left-right direction, and has gear teeth over the entire peripheral surface thereof. The agitator gear 200 has a substantially D-shaped through hole 200A in a side view in the radial center.

The agitator gear 200 is supported on the left end portion of the rotation shaft S of the agitator 6. In this state, the left end portion of the rotation shaft S is incapable of relative rotation in the through hole 159A of the agitator gear 200. As a result, the agitator gear 200 cannot rotate relative to the rotation axis S, and can rotate together with the rotation axis S.
(2-3-2) Idle Gear Train The idle gear train 201 includes a first idle gear 202, a second idle gear 203, and a third idle gear 204.

  The first idle gear 202 has a substantially disc shape having a thickness in the left-right direction. The first idle gear 202 includes a through hole 202A having a substantially circular shape in a side view at the center in the radial direction, and gear teeth over the entire peripheral surface. As shown in FIGS. 35 and 38, the first idle gear 202 is supported by a projection 209, which will be described later, of the cover 196. The first idle gear 202 can rotate relative to the protrusion 209. The first idle gear 202 meshes with the upper front portion of the gear portion 46 of the development coupling 44.

  The second idle gear 203 has a substantially disc shape that is thicker in the left-right direction and smaller in diameter than the first idle gear 202. The second idle gear 203 includes a through hole 203A having a substantially circular shape in a side view at the radial center and gear teeth over the entire peripheral surface. The second idle gear 203 is supported by a protrusion 210 described later of the cover 196. The second idle gear 203 can rotate relative to the protrusion 210. The second idle gear 203 meshes with the upper front portion of the first idle gear 202.

The third idle gear 204 has a thickness in the left-right direction, and has a substantially disk shape with the same diameter as the second idle gear 203. The third idle gear 204 includes a through hole 204A having a substantially circular shape in a side view at the radial center and gear teeth over the entire circumferential surface. The third idle gear 204 is supported by a projection 211 described later of the cover 196. The third idle gear 204 can rotate relative to the protrusion 211. The third idle gear 204 meshes with the front portion of the second idle gear 203 and meshes with the rear upper portion of the agitator gear 200.
(2-4) Linear Motion Cam The linear motion cam 195 includes an electrode contact portion 205 as shown in FIGS. The linear motion cam 195 has the same shape as the left linear motion cam 38 of the first embodiment except that the electrode contact portion 205 is provided.

  The electrode contact portion 205 is disposed above the contact portion 51. The electrode contact portion 205 extends upward from the front end portion of the contact portion 51, bends backward at the upper end portion, and extends rearward. The rear end portion of the electrode contact portion 205 is disposed slightly ahead of the rear end portion of the contact portion 51. The electrode contact part 205 includes a displacement part 206 and a holding part 207.

  The displacement portion 206 is disposed at the rear end portion of the electrode contact portion 205. The left surface of the displacement portion 206 is inclined leftward from the rear to the front. In other words, the protruding length of the displacement portion 206 becomes gradually longer from the rear to the front.

The holding unit 207 is continuous behind the displacement unit 206. The left surface of the holding portion 207 is continuous with the front end portion of the left surface of the displacement portion 206 and extends in the front-rear direction.
(2-5) Cover The cover 196 is fixed to the left wall 27L of the frame 21 with screws (not shown). The cover 196 includes a hole 208, a protrusion 209, a protrusion 210, and a protrusion 211 as shown in FIGS. The cover 196 has the same shape as the cover 40 of the first embodiment except that the cover 196 includes a hole 208, a protrusion 209, a protrusion 210, and a protrusion 211.

  The hole 208 is disposed above the opening 62. The hole 208 has a substantially circular shape in side view. The diameter of the hole 208 is slightly larger than the outer diameter of the contact portion 190 of the developing electrode 194.

  The protrusion 209 is disposed on the front upper side of the opening 62. The protrusion 209 extends from the right surface of the left wall of the cover 196 toward the right. The protrusion 209 has a substantially cylindrical shape. The protrusion 209 is fitted in the through hole 202 </ b> A of the first idle gear 202.

  The protrusion 210 is disposed on the front upper side of the protrusion 209. The protrusion 210 extends from the right surface of the left wall of the cover 196 toward the right. The protrusion 210 has a substantially cylindrical shape. The protrusion 210 is fitted in the through hole 203 </ b> A of the second idle gear 203.

The protrusion 211 is disposed in front of the protrusion 210. The protrusion 211 extends rightward from the right surface of the left wall of the cover 196. The protrusion 211 has a substantially cylindrical shape. The protrusion 211 is fitted in the through hole 204 </ b> A of the third idle gear 204.
(2-6) Compression Spring As shown in FIG. 37, the compression spring 188 is disposed in the protrusion 198 so that the contact portion 190 is disposed inward in the radial direction. The compression spring 188 is a coil spring that is smaller than the inner diameter of the protrusion 198 and larger than the diameter of the contact portion 190 of the developing electrode 194. The compression spring 188 is in contact with the right surface of the left wall of the protrusion 198 at the left end from the right, and is in contact with the contact portion 189 of the developing electrode 194 from the left at the right end. The compression spring 188 always urges the developing electrode 194 toward the inward position.
(3) Advance or retract of development coupling and development electrode Next, the movement of the development coupling 44 and the development electrode 194 from the inward position to the outward position will be described.

  The handle member 101 moves from the extended position toward the tilted position.

  Then, the protrusion 105A of the handle member 101 presses the rear end portion of the connecting portion 53 of the linear motion cam 195 from the front as shown in FIG. 39A. Thereby, the linear cam 195 is pressed by the protrusion 105A and moves rearward.

  The displacement portion 54 of the contact portion 51 comes into contact with the right end portion of the development coupling 44 from the front before the displacement portion 206 of the electrode contact portion 205 comes into contact with the development electrode 194.

  As a result, the development coupling 44 moves slightly to the left against the biasing force of the compression spring 39 (see FIG. 6) along the inclination of the displacement portion 54 of the contact portion 51, as shown in FIG. 39B. To do. At this time, the developing electrode 194 is located at the inward position.

  When the handle member 101 further moves to the tilted position, the projection 105A moves in the clockwise direction of the linear cam 195 while moving clockwise with the rear end of the handle member 101 as a fulcrum, as shown in FIG. 40A. The inclined portion 56A is pressed so as to slide upward from below.

  Thereby, as shown in FIG. 40B, the linear cam 195 further moves rearward. Then, the development coupling 44 moves further to the left against the urging force of the compression spring 39 (see FIG. 6) along the inclination of the displacement portion 54 of the contact portion 51.

  Further, the displacement portion 206 of the electrode contact portion 205 comes into contact with the contact portion 189 of the developing electrode 194 from the front. Then, the developing electrode 194 moves to the left against the urging force of the compression spring 188 along the inclination of the displacement portion 206 of the electrode contact portion 205.

  When the handle member 101 further moves to the tilt position, the protrusion 105A presses the vertical portion 56B of the linear cam 195 so as to slide upward from below. As a result, the linear cam 195 further moves rearward.

  As shown in FIG. 41A, the linear cam 195 is located above the projection 58 so that the projection 105A gets over the projection 58, and is located at the pressing position.

  Then, as shown in FIG. 41B, the development coupling 44 and the development electrode 194 are positioned at the outward position. Thereby, the movement of the developing coupling 44 and the developing electrode 194 from the inner position to the outer position is completed.

  Next, the movement of the development coupling 44 and the development electrode 194 from the outer position to the inner position will be described.

  The handle member 101 moves from the tilted position toward the extended position. The linear cam 195 moves forward as the handle member 101 moves from the tilted position to the extended position.

  Then, as shown in FIG. 40, first, the developing electrode 194 is moved from the outer position to the inner position by the urging force of the compression spring 188. Thereafter, as shown in FIG. 39, the development coupling 44 is moved from the outer position to the inner position by the biasing force of the compression spring 39.

As shown in FIG. 35, when the handle member 101 is located at the extended position, the development coupling 44 and the development electrode 194 are located at the inward position. Thereby, the movement of the developing coupling 44 and the developing electrode 194 from the outer position to the inner position is completed.
(4) Operation of Developing Cartridge Next, the state when the developing coupling 44 receives driving force from the driving source in the main body casing 2 will be described.

  The concave portion 48 of the development coupling 44 rotates relative to the main body coupling 116 of the main body casing 2 when the development coupling 44 is located in the outer position in the main body casing 2, as indicated by phantom lines in FIG. 37B. It becomes impossible.

  Further, the contact portion 190 </ b> A of the developing electrode 194 comes into contact with the main body electrode 212 of the main body casing 2 when the developing electrode 194 is located at the outer position.

  The developing electrode 194 receives power from the main body electrode 212 during the above-described image forming operation. The electric power received by the developing electrode 194 is transmitted to the developing roller shaft 111 and the supply roller shaft 121 via the bearing member 192.

  The development coupling 44 receives a driving force from the main body coupling 116 during an image forming operation.

  Then, as shown in FIG. 36, the development coupling 44 rotates clockwise in a left side view. The developing gear 45 rotates counterclockwise as viewed from the left side. The first idle gear 202 rotates counterclockwise when viewed from the left side. The second idle gear 203 rotates clockwise when viewed from the left side. The third idle gear 204 rotates counterclockwise as viewed from the left side. As a result, the developing roller 11 rotates counterclockwise as viewed from the left side.

Further, the agitator gear 200 rotates clockwise as viewed from the left side. The agitator 6 rotates clockwise when viewed from the left side.
(5) Effects of Fifth Embodiment Also in the fifth embodiment, the same effects as those of the first embodiment described above can be obtained.
(6) Modification of Fifth Embodiment In the fifth embodiment described above, the first idle gear 202 is an example of a passive member, but the present invention is not limited to this. For example, the structure which arrange | positions a rubber layer in the outer peripheral surface of a rotary body, and makes the rubber layer contact another gear may be sufficient.
11. Sixth Embodiment With reference to FIGS. 42 and 43, a sixth embodiment of the developing cartridge of the present invention will be described. Note that in the sixth embodiment, members similar to those of the first embodiment described above are denoted by the same reference numerals, and descriptions thereof are omitted.
(1) Outline of Sixth Embodiment In the first embodiment described above, the developing cartridge 7A includes the handle member 101 that moves the left linear cam 38 and the right linear cam 68. The handle member 101 includes a regulating member 104 that regulates unintended movement of the handle member 101.

On the other hand, in the sixth embodiment, as shown in FIGS. 42 and 43, the developing cartridge 7F does not include the handle member 101. The cover 222 includes a regulating member 226 that regulates the movement of the left linear cam 223.
(2) Configuration of Sixth Embodiment The developing cartridge 7F includes a drive unit 240. The drive unit 240 includes a left linear cam 221 and a cover 222.
(2-1) Left linear motion cam Unlike the left linear motion cam 38 of the first embodiment, the left linear motion cam 223 does not include the contact portion 52 but includes the operation portion 224.

The operation unit 224 extends leftward from the rear end portion of the connecting portion 53. The operation unit 224 has a substantially flat plate shape.
(2-2) Cover Unlike the cover 40 of the first embodiment, the cover 222 includes an opening 225 and a regulating member 226.

  The opening 225 is disposed at the rear end portion of the cover 222. The opening 225 penetrates the left wall of the cover 222 in the left-right direction. The opening 225 has a substantially rectangular shape in side view.

  The restricting member 226 is disposed in the opening 225. The regulating member 226 has a substantially rectangular flat plate shape that is long in the front-rear direction and viewed from the side. Each of both ends in the front-rear direction of the regulating member 226 is supported by each peripheral edge of both ends in the front-rear direction of the opening 225. The restricting member 226 is vertically moved between a restricting position (see FIGS. 42A and 43C) arranged in the lower end portion of the opening 225 and a restriction releasing position (see FIGS. 43A and 43B) arranged in the upper end portion of the opening 225. Configured to move in the direction. The restricting member 226 restricts the movement of the left linear cam 223 in a state where it is located at the restricting position. Further, the restricting member 226 releases the restriction on the movement with respect to the left linear cam 223 in the state where the restricting member 226 is located at the restriction releasing position. The restricting member 226 has a pair of grooves 227.

Each of the pair of grooves 227 is disposed at each of both ends of the regulating member 226 in the front-rear direction. Each of the pair of grooves 227 is a concave groove cut out upward from the lower end portion of the regulating member 226.
(2-3) Advancement and Retraction of Development Coupling Next, the movement of the development coupling 44 from the outer position to the inner position will be described.

  First, as shown in FIG. 42, the left linear cam 223 is restricted from moving from the pressing release position to the pressing position by the restricting member 226. At this time, the operation portion 224 of the left translation cam 223 is disposed in the lower front end portion of the opening 225 of the cover 222 and is engaged in the groove 227 in front of the restriction member 226. As shown in FIG. 43A, when the regulating member 226 moves from the regulated position to the regulated release position, the regulating member 226 moves upward from the operation portion 224 of the left translation cam 223. Thereby, the movement of the left linear cam 223 from the pressing release position to the pressing position is allowed. Then, as the operation unit 224 moves, the left linear cam 223 moves from the pressing release position to the pressing position as shown in FIGS. 43A and 43B.

  Thereafter, when the left translation cam 223 is moved rearward from the pressing release position and the operation portion 224 of the left translation cam 223 is disposed in the lower rear end portion of the opening 225 of the cover 222, the left translation cam 223 is Located in the pressing position. As a result, the development coupling 44 is positioned in the outward position as shown in FIG. 43B.

  Then, in this state, as shown in FIG. 43C, when the regulating member 226 is moved from the regulated position to the regulated release position, the operation portion 224 of the left linear cam 223 is placed in the groove 227 behind the regulating member 226. Engage. The left translation cam 223 is restricted from moving from the pressed position to the pressed release position.

  When the developing coupling 44 is moved from the outward position to the inward position, as shown in FIG. 43B, the left linear cam 223 is shown in FIG. 43A after the restriction member 226 is located in the restriction release position. As described above, it moves from the pressing release position to the pressing position.

Then, the development coupling 44 is located at the inward position.
(3) Configuration of power reception unit The power reception unit of the sixth embodiment is configured in the same manner as the drive unit, although not shown. Specifically, unlike the right translation cam 68 of the first embodiment, the right translation cam does not include the contact portion 82 but includes an operation unit similar to the drive unit described above. Note that the operation unit of the power reception unit extends rightward from the rear end portion of the connecting portion 83.

  Further, unlike the cover 69 of the first embodiment, the cover has an opening and a regulating member. The opening and the regulating member are configured in the same manner as the opening 225 and the regulating member 226 of the driving unit described above.

  When the developing electrode 65 is moved from the inward position to the outward position, the right translation cam moves from the pressing release position to the pressing position after the restricting member is positioned at the restriction releasing position.

  Then, the developing electrode 65 is located at the outward position.

  Further, when the developing electrode 65 is moved from the outer position to the inner position, the right translation cam moves from the pressing release position to the pressing position after the regulating member is located at the regulation releasing position.

Then, the developing electrode 65 is located at the inward position.
(4) Effects of the sixth embodiment Also in the sixth embodiment, the same functions and effects as those of the first embodiment described above can be obtained.
12 Seventh Embodiment With reference to FIGS. 44 to 49, a seventh embodiment of the developing cartridge of the present invention will be described. Note that in the seventh embodiment, members similar to those of the first embodiment described above are denoted by the same reference numerals, and descriptions thereof are omitted.
(1) Overview of Seventh Embodiment In the first embodiment described above, the handle member 101 includes a protrusion 105 that engages with the left linear cam 38 or the right linear cam 68.

On the other hand, in the seventh embodiment, the handle member 241 does not include the protrusion 105 as shown in FIGS. Instead, the drive unit 240 of the seventh embodiment includes an engagement shaft 243.
(2) Configuration of Seventh Embodiment The developing cartridge 7G includes an operation unit 239 and a drive unit 240.
(2-1) Operation Unit The operation unit 239 includes a handle member 241, an engagement shaft 243, and a compression spring 248.

  45 and 46, the handle member 241 is different from the handle member 101 of the first embodiment in that it does not include the protrusion 105 but includes a hole 244 and a spring support portion 245.

  The hole 244 is disposed at the lower end portion of the link portion 103. The hole 244 penetrates the link portion 103 in the left-right direction. The hole 244 has a substantially circular shape in a side view.

  The spring support portion 245 protrudes outward in the left-right direction from the periphery of the hole 244. The spring support portion 245 has a substantially cylindrical shape. The spring support portion 245 is disposed so that the center axis thereof overlaps the center of the hole 244. The inner diameter of the spring support 245 is larger than the diameter of the hole 244.

  The engagement shaft 243 is disposed in the spring support portion 245 of the handle member 241 at a portion on the inner side in the left-right direction with respect to the flange portion 247. The engagement shaft 243 has a substantially cylindrical shape extending in the left-right direction. The engagement shaft 243 includes a flange portion 247.

  The flange portion 247 is disposed at the approximate center of the engagement shaft 243 in the left-right direction. The flange portion 247 protrudes outward in the radial direction of the engagement shaft 243 from the outer peripheral surface of the engagement shaft 243 and extends in the circumferential direction of the engagement shaft 243.

  The engagement shaft 243 has an interlocking position (see FIG. 47B) that interlocks the handle member 141 and the left linear cam 38 and an interlock release position that releases the interlock between the handle member 141 and the left linear cam 38 (see FIG. 47A). ) To move between.

  When the engagement shaft 243 is disposed at the interlocking position, as shown in FIGS. 46B and 47B, the right end portion of the engagement shaft 243 protrudes rightward from the hole 244, and the second engagement of the left linear cam 38. It is arranged in front of the joint portion 57. Further, the left end portion of the engagement shaft 243 is disposed in the guide groove 246.

  When the engagement shaft 243 is disposed at the interlock release position, as shown in FIGS. 46A and 47A, the right end portion of the engagement shaft 243 is disposed in the hole 244 and the left end portion of the engagement shaft 243 is disposed. Protrudes leftward from the guide groove 246.

The compression spring 248 is disposed in the spring support portion 245 so that the left and right inner ends of the engagement shaft 243 are disposed radially inward. The compression spring 248 is a coil spring extending in the left-right direction. The compression spring 248 is in contact with the right surface of the flange portion 247 of the engagement shaft 243 at the left end portion from the right side, and is in contact with the left surface of the link portion 103 at the right end portion from the left side. The compression spring 248 always urges the engagement shaft 243 toward the left.
(2-2) Cover The drive unit 240 includes a cover 242 as shown in FIGS. 44 and 45.

  Unlike the cover 40 of the first embodiment, the cover 242 has a guide groove 246.

The guide groove 246 is disposed at the front end portion of the cover 242. The guide groove 246 penetrates the left wall of the cover 242 in the left-right direction. The guide groove 246 has a substantially arc shape extending from the front lower end portion of the cover 242 toward the rear upper side. The guide groove 246 extends along the movement locus of the hole 244 accompanying the movement of the handle member 241.
(3) Mounting operation of developing cartridge with respect to main body casing Next, the mounting operation of the developing cartridge 7G with respect to the main body casing 2 and the movement of the developing coupling 44 from the inward position to the outward position will be described.

  First, when the developing cartridge 7 </ b> G is detached from the main casing 2, the engagement shaft 243 is positioned at the interlock release position by the urging force of the compression spring 248. In this state, the left linear cam 38 does not move as the handle member 241 moves.

  48A, when the developing cartridge 7G is inserted into the main casing 2 with the handle member 241 disposed at the extended position, as shown in FIG. 48B, the left end portion of the engagement shaft 243 Is disposed in the mounting guide 249 of the main casing 2.

  When the developing cartridge 7G is further inserted into the main body casing 2, as shown in FIG. 48C, the left end portion of the engaging shaft 243 comes into contact with the inclined surface 250 of the mounting guide 249 of the main body casing 2 from the front. Due to the inclination of the inclined surface 250, the developing cartridge 7G is pressed rightward along the rearward movement.

  Then, the engagement shaft 243 moves to the right from the interlock release position and is positioned at the interlock position. Thereby, the left linear cam 38 can be moved with the movement of the handle member 241.

  Thereafter, as in the first embodiment described above, when the handle member 241 is moved from the extended position to the tilted position, the developing coupling 44 is disposed at the outward position.

  As shown in FIG. 49A, when the developing cartridge 7G is inserted into the main body casing 2 with the handle member 241 disposed at the tilted position, the left end portion of the engagement shaft 243 is The main casing 2 comes into contact with the front end of the side wall.

Thereby, when the handle member 241 is disposed at the tilted position, the mounting of the developing cartridge 7G to the main body casing 2 is restricted.
(5) Configuration of Power Receiving Unit Although not shown, the power receiving unit of the seventh embodiment is configured in the same manner as the drive unit. For more information,
Further, unlike the cover 69 of the first embodiment, the cover has a guide groove extending along the movement locus of the hole 244 accompanying the movement of the handle member 241.

  The engagement shaft 243 is disposed in front of the second engagement portion 89 of the right translation cam 68 at the interlock position, and interlocks the handle member 241 and the right translation cam 68.

Further, the engagement shaft 243 is disposed in the guide groove at the interlock release position, and releases the interlock between the handle member 241 and the right translation cam 68.
(6) Effects of the Seventh Embodiment Also in the seventh embodiment, the same functions and effects as those of the first embodiment described above can be obtained.
13. Modified Example of Developing Electrode A modified example of the developing electrode 65 of the developing cartridge of the present invention will be described with reference to FIGS. In these modified examples, the same members as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

In each embodiment described above, the shape of the developing electrode is not particularly limited.
(1) The developing electrode 251 may include, for example, a conductive member 252 and an insulating member 253 as shown in FIG.

  The conducting member 252 has the same shape as the developing electrode 65 of the first embodiment described above.

  The insulating member 253 has a substantially cylindrical shape extending in the left-right direction. The inner diameter of the insulating member 253 is slightly larger than the outer diameter of the contact portion 91 of the conducting member 252. The horizontal dimension of the insulating member 253 is slightly shorter than the horizontal length of the contact portion 91 of the conducting member 252. The insulating member 253 is fitted to the contact portion 91 of the conducting member 252 from the outside in the radial direction of the contact portion 91.

  In addition, the thickness of the surrounding wall of the insulating member 253 is not specifically limited, For example, as shown in FIG.

  Further, the insulating member 253 is not particularly limited, and may be a substantially frame shape, for example, as shown in FIG.

  Further, the configuration of the conductive member 252 is not particularly limited. For example, as illustrated in FIGS. 52A and 52B, a contact portion 257 having a tapered contact end portion and a support portion 258 that detachably supports the contact portion 257. May be provided so as to be separable.

  Further, as shown in FIG. 53, the conducting member 252 may include a ring-shaped contact portion 255 and a wire 256 connected to the contact portion 255.

  According to this modified example, unintentional conduction between the external configuration and the developing electrode 251 can be blocked in the insulating member 253 while ensuring the conduction of the developing electrode 251 in the conducting member 252.

In addition, when the conductive member 252 and the insulating member 253 are configured to move integrally, unintentional conduction between the external configuration and the developing electrode 251 can be interrupted even while the developing electrode 251 is moving. it can.
(2) Further, as shown in FIG. 54, the developing electrode 261 may include an insulating member 262 that is supported by the cover 69 so as not to move, and a conductive member 263 that can move with respect to the insulating member 262.

  The cover 69 has a hole 264 as shown in FIG.

  The hole 264 is disposed at the front lower side of the opening 94 of the cover 69. The hole 264 penetrates the right wall of the cover 69 in the left-right direction. The hole 264 has a substantially rectangular shape in side view.

  The insulating member 262 extends in the front-rear direction, is bent rightward at the rear end portion thereof, and extends rightward. The insulating member 262 has a substantially L-shaped prism shape in plan view. The insulating member 262 can be separated in the vertical direction at the center in the vertical direction. The right end portion of the insulating member 262 is fitted in the hole 264.

  As shown in FIG. 56, the conducting member 263 has an inward position (see FIGS. 54A and 56A) located inward of the insulating member 262, and an outward position that protrudes greatly to the right from the right end of the insulating member 262. (Refer to FIG. 54A and FIG. 56A).

  Unlike the developing electrode 65 of the first embodiment described above, the conducting member 263 is a wire that extends in the front-rear direction when the conducting member 263 is located at the inward position. The conducting member 263 is located in the insulating member 262 at the rear end portion. The conducting member 263 is configured to elastically deform rightward along the shape of the insulating member 262 when the conducting member 263 moves from the inner position to the outer position. The conducting member 263 projects greatly to the right from the hole 264 when the conducting member 263 is located at the outer position. Further, when the conducting member 263 is disposed at the outward position, it can be elastically deformed in its radial direction as indicated by a virtual line in FIG. 56B. The conducting member 263 may be a plate-like member as shown in FIG.

  According to this modification, it is possible to prevent the conductive member 263 from being damaged when an unintended external force is applied to the conductive member 263 from the front-rear direction or the vertical direction.

  Further, according to this modification, only the conducting member 263 can be moved with respect to the insulating member 262, and the conduction of the developing electrode 261 can be ensured, the external configuration and the intention of the developing electrode 261 can be achieved with a simple configuration. Can be achieved.

As shown in FIG. 58A, the insulating member 281 may be an elastically deformable film or the like. The insulating member 281 has a hole 282 having a diameter slightly smaller than the outer diameter of the conducting member 263. Then, the conduction member 263 penetrates the hole 282 of the insulating member 281 when moving from the inner position to the outer position. As a result, the tip of the conducting member 263, that is, the right end portion protrudes from the hole 282 to the right.
(3) The developing electrode 65 may be a coil spring extending in the left-right direction. In this case, the developing electrode 65 can be elastically deformed within a range of 2 to 5 mm, for example.

  When the developing electrode 65 is a coil spring, the developing electrode can be elastically brought into contact with the main body electrode 117 of the main body casing 2.

  As a result, the developing electrode 65 can be more reliably brought into contact with the main body electrode 117.

  Further, when the developing electrode 65 is elastically deformable within a range of 2 to 5 mm, for example, the developing electrode 65 is elastically applied to the main body electrode 117 while ensuring the contact pressure of the developing electrode 65 with respect to the main body electrode 117. Can be contacted.

As a result, the developing electrode 65 can be more reliably brought into contact with the main body electrode 117.
(4) Also in these modified examples, the same operational effects as those of the first embodiment described above can be obtained.
14 Other Modifications In each of the above-described embodiments, the gear is used as an example of the transmission mechanism unit, but the present invention is not limited to this. For example, the rubber layer may be disposed on the outer peripheral surface of the rotating body, and the rubber layer may be in contact with another gear or the rubber layer of the rotating body.

  The handle member in each of the above-described embodiments has moved the development coupling and the development electrode from the inward position to the outward position by the operator directly moving from the extended position to the tilted position. When the main body cover moves toward the closed position covering the opening of the main body casing, the handle member may come into contact with the main body cover so that the handle member moves from the extended position to the tilted position. .

  The present invention is not limited to the above-described embodiments and modifications, and various design changes such as combinations of the embodiments and modifications are within the scope of the matters described in the claims. Can be applied.

2 Main body casing 7 Developing cartridge 12 Supply roller 27L Left wall 27R Right wall 44 Development coupling 45 Development gear 48 Recess 70 First idle gear 71 Second idle gear 72 Supply gear 111 Development roller shaft 121 Supply roller shaft 157 Development gear 158 Idle Gear 159 Supply gear 161 Coupling member 169 Coupling support member 171 Coupling support boss 271 Idle gear 273 Supply gear 274 Coupling support member A2 Center axis of supply roller

Claims (10)

A supply roller having a first axis extending in a first direction;
A coupling configured to transmit a driving force supplied from the outside to the supply roller;
2. The developing cartridge according to claim 1, wherein the coupling is configured to rotate in a direction opposite to the supply roller with the first axis of the supply roller as a rotation center.   The developing cartridge according to claim 1, further comprising a transmission mechanism configured to transmit the driving force received by the coupling to the supply roller. The transmission mechanism is
A first transmission portion disposed on the first axis and configured to transmit the driving force received by the coupling to the supply roller; and the driving force received by the coupling from the coupling. The developing cartridge according to claim 2, further comprising a second transmission unit configured to transmit to the first transmission unit. The second transmission unit is
A third transmission portion that contacts the coupling;
The developing cartridge according to claim 3, further comprising a third transmission unit and a fourth transmission unit that contacts the first transmission unit.   The developing cartridge according to claim 3, wherein the second transmission unit includes a third transmission unit that contacts the coupling and the first transmission unit. A first wall; and a second wall positioned at a distance from the first wall in the first direction;
6. The developing cartridge according to claim 3, wherein the coupling, the first transmission unit, and the second transmission unit are disposed on the first wall. 7. A first wall; and a second wall positioned at a distance from the first wall in the first direction;
The coupling is disposed on the first wall;
Wherein the first transmission unit may be disposed on the second wall, the developing cartridge according to claim 3 or 4. The supply roller has a shaft extending along the first axis;
A support member for supporting the shaft of the supply roller;
The developing cartridge according to claim 1, wherein the support member includes a support portion that supports the coupling. The supply roller has a shaft extending along the first axis;
The developing cartridge according to claim 1, wherein the coupling is supported on the shaft of the supply roller so as to be relatively rotatable.   The said coupling is provided with the 1st end part in the said 1st direction, and the recessed part dented in the direction opposite to the said 1st direction from the said 1st end part, The one of Claim 1 thru | or 9 characterized by the above-mentioned. The developing cartridge according to 1.

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