JP6237239B2 - Developer cartridge - Google Patents

Description

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

  As an image forming apparatus, there is known a printer provided with a cartridge having a supply roller in a detachable manner.

  As such a cartridge, a developing cartridge having a supply electrode electrically connected to a supply roller shaft of a supply roller is known.

  Such a developing cartridge is configured to be mounted in the printer such that its supply electrode is rubbed against a supply contact provided in the printer (see, for example, Patent Document 1).

JP 2011-133766 A

  However, in the developing cartridge described in Patent Document 1 described above, the supply electrode is exposed because it is rubbed against the supply contact. For this reason, when the developing cartridge is attached to the printer, the supply electrode and a member in the printer come into contact with each other, so that the supply electrode is easily damaged. Further, when the developing cartridge is mounted on the printer, the supply electrode may be easily damaged even when the supply electrode comes into contact with the supply contact.

  Accordingly, an object of the present invention is to provide a developing cartridge capable of suppressing the supply electrode from being damaged.

(1) In order to achieve the above object, the developing cartridge of the present invention is a developing cartridge that can be mounted in the mounting direction with respect to the main body of the image forming apparatus having the main body electrode therein, and is orthogonal to the mounting direction. A developing roller configured to rotate about a rotation axis along the first direction; a supply roller configured to rotate about a rotation axis along the first direction and configured to supply developer to the developing roller; A housing having a wall portion orthogonal to the first direction and containing a developer therein; a developing electrode disposed adjacent to the wall portion in the first direction and electrically connected to the developing roller; A supply electrode disposed adjacent to the wall in one direction and electrically connected to the supply roller; a first protection unit disposed downstream of the supply electrode in the mounting direction and protecting the supply electrode; With the second Protection unit, toward the upstream of the mounting direction, in the first direction, has an inclined surface inclined away from the wall.

  According to such a configuration, when the developing cartridge is attached to the image forming apparatus, the main body electrode is first brought into contact with the first protection portion. Furthermore, since the first protective part has an inclined surface, the main body electrode can be guided away from the wall part.

As a result, the supply electrode can be protected by the first protection unit, and the supply electrode can be prevented from being damaged.
(2) Further, the supply electrode may be a supply contact portion configured to contact the body electrode, and may include a supply contact portion configured to contact the body electrode in the first direction.

  According to such a configuration, the main body electrode contacts the supply contact portion in the first direction.

Therefore, the main body electrode can be reliably brought into contact with the supply contact portion of the supply electrode.
(3) Further, the supply roller may include a supply roller shaft extending along the first direction, and the supply roller shaft and the supply contact portion may be arranged with a gap in the mounting direction.

  According to such a structure, it can suppress that a supply roller axis | shaft contacts with a main body electrode and is damaged.

On the other hand, when the supply contact portion and the main body electrode come into contact with each other, power can be reliably supplied to the supply roller shaft.
(4) Moreover, you may provide the 2nd protection part arrange | positioned adjacent to a supply contact part in the 2nd direction orthogonal to both a 1st direction and a mounting direction.

  According to such a configuration, when the developing cartridge is mounted on the image forming apparatus, the supply contact portion can be protected by the second protection portion even when the developing cartridge is inserted with being shifted.

As a result, the supply electrode can be more reliably suppressed from being damaged.
(5) Moreover, the insulating member for interrupting | blocking the electrical connection of a developing electrode and a supply electrode is provided, and the insulating member may have the 1st protection part and the 2nd protection part integrally.

According to such a configuration, the insulating member can cut off the electrical connection between the developing electrode and the supply electrode, but by having the first protective portion and the second protective portion integrally, The number of parts can be reduced.
(6) The first protection part may be disposed adjacent to the development electrode in the second direction, and the second protection part may be disposed adjacent to the development electrode in the mounting direction.

According to such a configuration, not only the supply electrode but also the development electrode can be protected by the first protection portion and the second protection portion.
(7) You may provide the 3rd protection part arrange | positioned adjacent to the upstream of a mounting direction with respect to a supply contact part.

According to such a configuration, the supply electrode can be further protected by protecting the upstream in the mounting direction in the supply contact portion.
(8) Moreover, the housing | casing may have the 3rd protection part integrally.

According to such a structure, since the 3rd protection part can be integrally formed with a case, reduction of a number of parts can be aimed at.
(9) Moreover, the supply contact portion may have a supply contact surface configured to be orthogonal to the first direction and to be in contact with the main body electrode.

According to such a configuration, the main body electrode can be reliably brought into contact with the supply contact surface orthogonal to the first direction.
(10) Further, the developing electrode may be configured to contact the body electrode in the first direction.

According to such a configuration, the developing electrode and the main body electrode can be reliably brought into contact with each other to supply power to the developing roller.
(11) The development electrode and the supply electrode may be made of a conductive resin material.

  According to such a configuration, power can be reliably supplied to the developing roller and the supply roller while each electrode can be easily molded from the resin material.

  In the developing cartridge of the present invention, the supply electrode can be prevented from being damaged.

FIG. 1A is a perspective view of the developing cartridge according to the first embodiment of the present invention as viewed from the right front side. FIG. 1B is a perspective view of the right part of the base frame shown in FIG. 1A as viewed from the front right. FIG. 2 is a central sectional view of a printer to which the developing cartridge shown in FIG. 1A is mounted. 3A is a perspective view of the right portion of the developing cartridge shown in FIG. 1A as viewed from the right rear. 3B is an exploded perspective view of the power supply unit shown in FIG. 3A as viewed from the right rear. FIG. 4 is a perspective view of the insulating member and the developing electrode shown in FIG. 3B as viewed from the right rear. FIG. 5A is a right side view of the developing frame in a state where the supply electrode shown in FIG. 3B is assembled to the right side wall. FIG. 5B is a right side view of the developing frame shown in FIG. 5A. 6A is a plan view of a right portion of the developing cartridge mounted on the printer shown in FIG. 6B is a cross-sectional view taken along the line AA in FIG. 6A. FIG. 7A is a perspective view of the process cartridge shown in FIG. 2 viewed from the right front side. FIG. 7B is a plan view of the right portion of the process cartridge shown in FIG. 7A. FIG. 8A is an explanatory diagram for explaining the attaching / detaching operation of the process cartridge shown in FIG. 7A with respect to the printer, in which the first main body electrode is arranged behind the insulating member and the second main body electrode is in contact with the developing electrode. Indicates. FIG. 8B is an explanatory diagram for explaining the attaching / detaching operation of the process cartridge to / from the printer, following FIG. 8A, in which the first main body electrode is in contact with the insulating member and the second main body electrode is rubbed against the developing electrode. Indicates the state. FIG. 9A is an explanatory diagram for explaining the attaching / detaching operation of the process cartridge to / from the printer, following FIG. 8B, in which the first main body electrode is slid against the insulating member and the supply electrode, and the second main body electrode is the developing electrode. The state which contacted the connection part is shown. FIG. 9B is an explanatory diagram for explaining the attachment / detachment operation of the process cartridge with respect to the printer, following FIG. 9A, in which the first main body electrode is in contact with the supply electrode and the second main body electrode is in contact with the development electrode. Indicates. FIG. 10 is a perspective view of the right portion of the developing cartridge according to the second embodiment of the present invention as viewed from the front right.

1. Overview of Developing Cartridge As shown in FIGS. 1A and 2, the developing cartridge 1 includes a developing frame 2, an agitator 3, a developing roller 4, a supply roller 5, and a layer thickness regulating blade 6 as an example of a casing. It has.

  In the following description, the direction where the developing roller 4 is disposed is the rear of the developing cartridge 1 and the opposite is the front of the developing cartridge 1. Further, the left and right sides are defined with reference to when the developing cartridge 1 is viewed from the front. Specifically, with respect to the direction of the developing cartridge 1, the arrow direction shown in each drawing is used as a reference.

  The left-right direction is an example of the first direction, the up-down direction is an example of the second direction, and the front-back direction is an example of the mounting direction. Further, the front is an example upstream in the mounting direction, and the rear is an example downstream in the mounting direction.

  The developing frame 2 has a substantially box shape extending in the left-right direction, and the rear end portion of the developing frame 2 is opened in the front-rear direction. Further, as shown in FIG. 2, the developing frame 2 has a toner storage chamber 7 and a developing chamber 8 arranged in parallel in the front-rear direction. The toner storage chamber 7 stores toner as an example of a developer.

  The agitator 3 is rotatably disposed at a substantially central portion in the front-rear and up-down directions of the toner storage chamber 7.

  The developing roller 4 is rotatably supported at the rear end portion of the developing chamber 8. The developing roller 4 includes a substantially cylindrical developing roller shaft 11 extending in the left-right direction, and a developing roller body 12 that covers the substantially center of the developing roller shaft 11 in the left-right direction. An upper part and a rear part of the developing roller body 12 are exposed from the developing frame 2.

  The supply roller 5 is rotatably supported in the developing chamber 8 at the front lower side of the developing roller 4. The supply roller 5 includes a substantially cylindrical supply roller shaft 13 that extends in the left-right direction, and a supply roller body 14 that covers substantially the center of the supply roller shaft 13 in the left-right direction. The rear upper end portion of the supply roller main body 14 is in pressure contact with the front lower end portion of the developing roller main body 12 of the developing roller 4.

The layer thickness regulating blade 6 is disposed in front of the developing roller 4 in the developing chamber 8. As shown in FIGS. 2 and 3A, the layer thickness regulating blade 6 is supported by the developing frame 2 so that the lower end portion of the layer thickness regulating blade 6 is in contact with the front upper end portion of the developing roller 4.
2. Overall Configuration of Printer As shown in FIG. 2, the printer 15 is an electrophotographic monochrome printer. The printer 15 includes a main body casing 16 as an example of an image forming apparatus main body, a process cartridge 17, a scanner unit 18, and a fixing unit 19.

  The main body casing 16 has a substantially box shape. The main body casing 16 includes an opening 20, a front cover 21, a paper feed tray 22, and a paper discharge tray 23.

  The opening 20 is configured to penetrate the front wall of the main casing 16 in the front-rear direction and allow the process cartridge 17 to pass therethrough.

  The front cover 21 has a substantially L-shaped plate shape in side view. The front cover 21 is swingably supported on the front wall of the main casing 16 with its lower end as a fulcrum. The front cover 21 is configured to open or close the opening 20.

  The paper feed tray 22 is disposed at the bottom of the main casing 16. The paper feed tray 22 is configured to accommodate the paper P.

  The paper discharge tray 23 is disposed on the upper surface of the main casing 16.

  The process cartridge 17 is configured to be attached to or detached from the main body casing 16 through the opening 20. The process cartridge 17 includes a drum cartridge 24 and the developing cartridge 1 described above.

  The drum cartridge 24 includes a photosensitive drum 25, a scorotron charger 26, and a transfer roller 27.

  The photosensitive drum 25 is disposed at the rear end portion of the drum cartridge 24 and has a substantially cylindrical shape extending in the left-right direction. The photosensitive drum 25 is rotatably supported by the drum cartridge 24.

  The scorotron charger 26 is disposed behind the photosensitive drum 25 and spaced from the photosensitive drum 25.

  The transfer roller 27 is disposed below the photosensitive drum 25. The transfer roller 27 is in contact with the lower end portion of the photosensitive drum 25.

  The developing cartridge 1 is configured to be attached to or detached from the drum cartridge 24. Further, the rear end portion of the developing roller 4 is configured to contact the front end portion of the photosensitive drum 25 in a state where the developing cartridge 1 is mounted on the drum cartridge 24.

  The scanner unit 18 is disposed above the process cartridge 17. The scanner unit 18 is configured to emit a laser beam based on image data toward the photosensitive drum 25 as indicated by a dotted line in FIG.

  The fixing unit 19 is disposed behind the process cartridge 17. The fixing unit 19 includes a heating roller 28 and a pressure roller 29. The pressure roller 29 is disposed rearward and downward with respect to the heating roller 28 and is in pressure contact with the rear lower end portion of the heating roller 28.

  When the printer 15 starts an image forming operation under the control of a control unit (not shown), the scorotron charger 26 uniformly charges the surface of the photosensitive drum 25. Thereafter, the scanner unit 18 exposes the surface of the photosensitive drum 25. Thereby, an electrostatic latent image based on the image data is formed on the surface of the photosensitive drum 25.

  The supply roller 5 supplies the toner in the development frame 2 to the development roller 4. As a result, the toner is frictionally charged positively between the developing roller 4 and the supply roller 5 and is carried on the developing roller 4. The layer thickness regulating blade 6 regulates the toner carried on the developing roller 4 to a certain thickness.

  The developing roller 4 supplies toner regulated to a certain thickness to the electrostatic latent image on the surface of the photosensitive drum 25. As a result, the toner image is carried on the surface of the photosensitive drum 25.

  The paper P is fed from the paper feed tray 22 between the photosensitive drum 25 and the transfer roller 27 one by one at a predetermined timing by the rotation of various rollers. The toner image on the photosensitive drum 25 is transferred to the paper P when passing between the photosensitive drum 25 and the transfer roller 27.

Thereafter, the heating roller 28 and the pressure roller 29 heat and press the paper P passing between them. As a result, the toner image on the paper P is thermally fixed on the paper P. Thereafter, the paper P is discharged to the paper discharge tray 23.
3. Details of Developing Cartridge As shown in FIGS. 1A and 6A, the developing cartridge 1 includes the developing frame 2 and the power supply unit 31 described above.
(1) Development Frame The development frame 2 includes a base frame 32 and a cover frame 33 as shown in FIGS. 2 and 6B.
(1-1) Base Frame The base frame 32 includes a left side wall 34, a right side wall 35 as an example of a wall portion, a front wall 36, and a lower wall 37.

  As shown in FIGS. 1A and 2, the left side wall 34 and the right side wall 35 are disposed at both left and right ends of the developing frame 2. Each of the left side wall 34 and the right side wall 35 has a substantially plate shape that is substantially rectangular in a side view extending in the front-rear direction. That is, each of the left side wall 34 and the right side wall 35 extends in a direction orthogonal to the left-right direction.

  Each of the left side wall 34 and the right side wall 35 includes, as shown in FIGS. 1B and 5B, a developing roller shaft insertion groove 42, a supply roller shaft insertion hole 43, a flange portion 45, a blade support portion 46, A positioning boss 47 is provided.

  As shown in FIGS. 3B and 5B, the developing roller shaft insertion groove 42 is disposed at a substantially central portion in the vertical direction of the rear end portions of the left side wall 34 and the right side wall 35, respectively. The developing roller shaft insertion groove 42 is substantially C-shaped when viewed from the side, and is recessed forward from the rear edge of each of the left side wall 34 and the right side wall 35. The inner diameter of the developing roller shaft insertion groove 42 is longer than the diameter of the developing roller shaft 11.

  The supply roller shaft insertion hole 43 is disposed in front of and below the developing roller shaft insertion groove 42 as shown in FIG. 5B. The supply roller shaft insertion hole 43 passes through each of the left side wall 34 and the right side wall 35 in a substantially rectangular shape in a side view. The inner dimension of the supply roller shaft insertion hole 43 is longer than the diameter of the supply roller shaft 13.

  As shown in FIG. 1B, the flange portion 45 has a substantially saddle shape extending so as to bend outward in the left-right direction from the substantially center in the front-rear direction at the upper end of each of the left side wall 34 and the right side wall 35. Yes. The upper surface of the flange 45 is defined as a joint surface 48.

  As shown in FIGS. 1A and 1B, the blade support portion 46 is continuous from the rear end portion of the flange portion 45 at the rear upper end portion of each of the left side wall 34 and the right side wall 35 and protrudes upward. The blade support portion 46 has a substantially prismatic shape extending in the front-rear direction. Although not shown, the blade support portion 46 has a screw hole that is recessed forward from the rear end surface of the blade support portion 46.

  The positioning boss 47 is disposed at the rear end portion of the flange portion 45. The positioning boss 47 has a substantially cylindrical shape that protrudes upward from the joint surface 48.

  Further, as shown in FIGS. 1B and 5B, the right side wall 35 includes an electrode support shaft 52, a first protruding wall 53, a second protruding wall 54 as an example of a third protective portion, and a connecting portion 55. It has one.

  The electrode support shaft 52 is disposed on the right surface of the right side wall 35 and in front of the supply roller shaft insertion hole 43. The electrode support shaft 52 has a substantially cylindrical shape extending from the right surface of the right side wall 35 toward the right. The electrode support shaft 52 has a thread on its inner surface.

  The first protruding wall 53 has a substantially plate shape that protrudes upward from the right end edge of the rear portion of the right side wall 35 and has a substantially crank shape in plan view. Further, as shown in FIG. 6B, the first projecting wall 53 extends upward from the flange portion 45, and the upper end edge thereof is arranged at substantially the same position as the upper end edge of the blade support portion 46 in the vertical direction. ing. As shown in FIGS. 1B and 5B, the first projecting wall 53 includes a rear portion 58, a bent portion 59, and a front portion 60.

  The rear portion 58 constitutes a rear portion of the first protruding wall 53 and has a substantially plate shape that protrudes upward from the right edge of the rear portion of the right side wall 35. The rear portion 58 includes a chamfered portion 62.

  The chamfered portion 62 is cut out at the rear upper end portion of the rear portion 58.

  The right surface of the rear portion 58 is defined as a rear flat surface 63. The rear flat surface 63 extends along the front-rear direction and faces to the left.

  As shown in FIGS. 1B and 3B, the bent portion 59 constitutes a substantially central portion in the front-rear direction of the first projecting wall 53 and extends from the front end edge of the rear portion 58 so as to be bent rightward. It has a substantially plate shape.

  The rear surface of the bent portion 59 is defined as a bent surface 64. The bent surface 64 faces rearward.

  As shown in FIGS. 1B and 5B, the front portion 60 constitutes a front portion of the first protruding wall 53 and has a substantially plate shape extending from the right end edge of the bent portion 59 so as to be bent forward. Have.

  The right surface of the front portion 60 is defined as a front flat surface 65. The front flat surface 65 extends along the front-rear direction and faces to the left.

  Further, as shown in FIG. 6A, the rear portion 58 overlaps the blade support portion 46 and the front portion 60 overlaps the positioning boss 47 when projected in the left-right direction.

  As shown in FIG. 1B and FIG. 6B, the second protruding wall 54 is disposed at the approximate center of the right side wall 35 in the front-rear direction. The second protruding wall 54 has a substantially plate shape that is bent from the front end edge of the front portion 60 of the first protruding wall 53 toward the right and extends in the up-down direction. The upper end edge of the second projecting wall 54 is disposed at substantially the same position as the upper end edge of the first projecting wall 53 in the vertical direction. That is, the upper end edge of the second projecting wall 54 extends upward from the flange 45.

  In the second projecting wall 54, the left end portion joined to the flange portion 45 of the right side wall 35 is a covered left end portion 66, and the opposite side of the covered left end portion 66, that is, the right end portion is a covered right end portion 67.

  The connecting portion 55 is configured to connect and reinforce the second projecting wall 54 and the right side wall 35. The connecting portion 55 includes a first rib 68 and a plurality of, that is, two second ribs 69.

  As shown in FIG. 1B and FIG. 6A, the first rib 68 substantially connects the front-rear direction substantially central portion of the right end edge of the right collar portion 45 and the front surface of the covering right end portion 67 of the second protruding wall 54. It has a plate shape. The right end edge of the first rib 68 extends to the right end edge of the second protruding wall 54. The front right portion of the first rib 68 is inclined rightward from the front toward the rear, and the inclined surface is defined as the first inclined surface 70. That is, the first rib 68 has a substantially triangular shape in plan view.

  The plurality of second ribs 69 are arranged in parallel at intervals in the left-right direction. The second rib 69 has a substantially plate shape that connects the upper surface of the first rib 68 and the front surface of the second protruding wall 54. The front upper portion of the second rib 69 is inclined upward from the front toward the rear, and the inclined surface is defined as the second inclined surface 71.

  The left second rib 69 connects the upper surface at the left end of the first rib 68 and the front surface at the left end of the second protruding wall 54. That is, the left second rib 69 overlaps the front portion 60 of the first protruding wall 53 when projected in the front-rear direction. Note that the second rib 69 on the left side has a substantially triangular shape in a side view because the second inclined surface 71 is defined.

  The right second rib 69 connects the upper surface of the first rib 68 at the approximate center in the left-right direction and the upper surface of the second projecting wall 54 at the approximate center of the left-right direction. The second rib 69 on the right side has a substantially trapezoidal shape when viewed from the side by defining the second inclined surface 71.

  As shown in FIGS. 1A and 2, the front wall 36 is constructed between the front end portion of the left side wall 34 and the front end portion of the right side wall 35. The front wall 36 has a substantially plate shape extending in the left-right direction. The front wall 36 includes a collar portion 75 and a grip portion 76.

  The collar portion 75 has a substantially collar shape extending so as to be bent forward over the entire region in the left-right direction at the upper end portion of the front wall 36. The upper surface of the flange 75 is defined as a joint surface 77.

  The grip portion 76 bulges rearward from a substantially central portion in the left-right direction on the rear surface of the front wall 36.

  The lower wall 37 is constructed between the lower end portion of the left side wall 34 and the lower end portion of the right side wall 35. As shown in FIG. 2, the lower wall 37 has a substantially plate shape that extends while curving along the front-rear direction. The lower wall 37 includes a curved wall 80, an arc wall 81, and a supply side seal 82 shown in FIGS. 5A and 5B.

  As shown in FIG. 2, the curved wall 80 extends rearward from the center of the lower wall 37 to the front portion, continuously from the lower end of the front wall 36. The curved wall 80 has a substantially arc shape along the rotation locus of the agitator 3.

  The arcuate wall 81 has a substantially W-shaped side sectional view that extends from the rear end of the curved wall 80 toward the rear in the rear portion of the lower wall 37. The front part of the arc wall 81 has a substantially arc shape along the rotation locus of the supply roller 5, and the rear part of the arc wall 81 extends rearward.

  As shown in FIGS. 5A and 5B, the supply side seal 82 is disposed on the upper surfaces of the left and right end portions of the front portion of the arc wall 81. The supply side seal 82 is made of an elastic member such as a sponge member. The supply side seal 82 has a substantially rectangular shape in side view and extends in the front-rear direction. The supply side seal 82 includes a supply roller shaft insertion hole 83.

The supply roller shaft insertion hole 83 penetrates the substantially central portion of the supply side seal 82 in a side view in a side view in a circular shape. The supply roller shaft insertion hole 83 is exposed from the supply roller shaft insertion hole 43 in a side view. The supply roller shaft insertion hole 83 receives the both left and right ends of the supply roller shaft 13 so as to be more outward in the left and right directions than the left side wall 34 and the right side wall 35, and supports the supply roller 5.
(1-2) Cover Frame As shown in FIGS. 1A and 2, the cover frame 33 integrally includes a bulging portion 86, a welding portion 87, and a blade placement portion 88.

  As shown in FIG. 1A, the bulging portion 86 constitutes a substantially central portion of the cover frame 33 in plan view. The bulging portion 86 bulges upward.

  The welding part 87 is arrange | positioned so that the bulging part 86 may be enclosed. Specifically, the welding portion 87 is disposed on the outer side in the left-right direction of the bulging portion 86 and on the front side. That is, the welded portion 87 has a substantially plate shape that is substantially U-shaped in plan view. When projected in the vertical direction, the left portion of the welded portion 87 corresponds to the flange portion 45 of the left side wall 34, and the right portion of the welded portion 87 corresponds to the flange portion 45 of the right side wall 35. A front portion of the portion 87 corresponds to the flange portion 75 of the front wall 36. The welded portion 87 includes a pair of positioning holes 89.

  The pair of positioning holes 89 are respectively disposed at the left and right rear ends of the welded portion 87. The positioning hole 89 penetrates the welded portion 87 in a substantially circular shape in plan view. Each of the pair of positioning holes 89 corresponds to each of the positioning boss 47 of the left side wall 34 and the positioning boss 47 of the right side wall 35, and positioning of the positioning boss 47 of the left side wall 34 and the right side wall 35. Each of the bosses 47 has a size that can be received.

As shown in FIG. 2, the blade mounting portion 88 has a substantially plate shape that continuously extends rearward from the rear end portion of the bulging portion 86.
(1-3) Development Frame As shown in FIGS. 1A and 6B, the development frame 2 is configured by combining the base frame 32 and the cover frame 33.

  Specifically, in the cover frame 33, the positioning boss 47 of the left side wall 34 is inserted into the left positioning hole 89 with respect to the base frame 32, and the positioning boss 47 of the right side wall 35 is inserted into the right positioning hole 89. It is positioned by being inserted. Accordingly, the lower surface of the welded portion 87 of the cover frame 33 is connected to the upper end portion of the base frame 32, specifically, the joint surface 48 of the flange portion 45 of each of the left side wall 34 and the left side wall 34, and the flange portion of the front wall 36. The cover frame 33 is assembled to the base frame 32 by being brought into contact with and welded to the 75 joining surfaces 77.

  In the developing frame 2 configured in this way, an end portion on the side where the developing roller 4 is disposed in the front-rear direction, that is, a rear end portion is a first end portion 91 and is opposite to the first end portion 91 in the front-rear direction. The end where the grip 76 is disposed, that is, the front end is defined as the second end 92.

As shown in FIG. 2, the space in front of the developing frame 2, that is, the front portion of the left side wall 34, the front portion of the right side wall 35, the front wall 36, the curved wall 80 of the lower wall 37, and the cover frame 33. The toner accommodating chamber 7 is defined by the bulging portion 86. Further, the space behind the developing frame 2, that is, the rear portion of the left side wall 34, the rear portion of the right side wall 35, the arc wall 81 of the lower wall 37, and the blade placement portion 88 of the cover frame 33, the developing chamber 8. Is defined.
(2) Power Supply Unit The power supply unit 31 includes a supply electrode 95, an insulating member 97, and a developing electrode 98, as shown in FIGS. 3A and 3B.
(2-1) Supply Electrode The supply electrode 95 is made of a conductive resin material such as conductive POM (polyacetal) and is electrically connected to the supply roller 5 as shown in FIGS. 3B and 5A. It is configured. The supply electrode 95 extends in a direction connecting the front upper side and the rear lower side in a side view. The supply electrode 95 integrally includes a supply contact portion 101, a supply fixing portion 102, and a supply insertion portion 103.

  The supply contact portion 101 is configured to come into contact with a first main body electrode 155 described later, and is disposed at the upper end portion of the supply electrode 95. The supply contact portion 101 has a substantially rectangular tube shape extending in the left-right direction with its right end portion closed. The right surface of the supply contact portion 101 is defined as the supply contact surface 106, and the front surface of the supply contact portion 101 is defined as the supply flat surface 107.

  The supply fixing portion 102 has a substantially plate shape that is substantially L-shaped in side view. Specifically, the supply fixing portion 102 continuously extends from the left end portion of the lower end portion of the supply contact portion 101, extends downward, then bends and extends rearward and downward. The supply fixing unit 102 has a first through hole 105.

  The first through hole 105 is arranged at a substantially central portion in the vertical direction of the supply fixing unit 102. The first through hole 105 passes through the supply fixing portion 102 in a substantially circular shape when viewed from the side. The inner diameter of the first through hole 105 is larger than the outer diameter of the electrode support shaft 52 of the right side wall 35.

The supply insertion part 103 is arrange | positioned at the lower end part of the supply electrode 95, as shown to FIG. 5A. The supply insertion portion 103 has a substantially cylindrical shape extending in the left-right direction, and the inner diameter thereof is substantially the same as the outer diameter of the supply roller shaft 13.
(2-2) Insulating Member As shown in FIG. 4, the insulating member 97 is made of an insulating resin material such as POM (polyacetal) and cuts off the electrical connection between the supply electrode 95 and the developing electrode 98. It is configured. The insulating member 97 integrally includes a bearing portion 109, a protection portion 110, and an engagement portion 111.

  The bearing portion 109 has a substantially plate shape that is substantially rectangular in a side view and extends in the vertical direction. The bearing portion 109 includes a developing shaft insertion port 114, a second through hole 115, and a supply shaft collar 116.

  The developing shaft insertion port 114 is disposed at the substantially center in the vertical direction in the rear portion of the bearing portion 109. The developing shaft insertion port 114 penetrates the bearing portion 109 in a substantially circular shape when viewed from the side. The inner diameter of the developing shaft insertion port 114 is substantially the same as the outer diameter of the developing roller shaft 11.

  The second through hole 115 is disposed at a substantially central portion in the vertical direction in the front portion of the bearing portion 109. The second through hole 115 passes through the bearing portion 109 in a substantially circular shape when viewed from the side. The inner diameter of the second through hole 115 is substantially the same as the outer diameter of the electrode support shaft 52.

  The supply shaft collar 116 is disposed in a lower portion of the bearing portion 109 at a substantially central portion in the front-rear direction. The supply shaft collar 116 protrudes rightward from the right surface of the bearing portion 109 and has a substantially cylindrical shape whose right end portion is closed. The inner diameter of the supply shaft collar 116 is substantially the same as the outer shape of the supply roller shaft 13.

  The protection part 110 is disposed at the front upper end of the insulating member 97. The protection part 110 is substantially L-shaped in a side view, and has a substantially rectangular tube shape that extends in the left-right direction and whose right end is closed. The protection unit 110 integrally includes a first protection unit 118 and a second protection unit 119.

  The first protection part 118 is a rear part of the protection part 110 and has a substantially rectangular shape in side view extending in the vertical direction. The left end portion of the lower portion of the first protection portion 118 is connected to the upper end of the bearing portion 109.

  The right end portion at the rear end portion of the first protection portion 118 is inclined rightward toward the front, and the inclined surface is defined as a first protection guide surface 121 as an example of the inclined surface. That is, the first protection guide surface 121 is inclined so as to be separated from the right side wall 35.

  Further, the right portion of the upper end portion of the first protection portion 118 is inclined rightward toward the front, and the inclined surface is defined as the second protection guide surface 122. That is, the second protection guide surface 122 faces a different direction from the first protection guide surface 121.

  Note that the upper end edge of the first protection guide surface 121 and the lower end edge of the second protection guide surface 122 are continuous.

  The second protection part 119 is a front part of the protection part 110 and has a substantially rectangular shape in a side view extending in the front-rear direction. The rear end portion of the second protection portion 119 is continuous with the lower end portion of the first protection portion 118. In addition, the left end portion of the lower portion of the second protection portion 119 is connected to the front upper end portion of the bearing portion 109.

The engaging portion 111 is disposed at the rear lower end portion on the left surface of the bearing portion 109. The engaging portion 111 protrudes from the left surface of the bearing portion 109 to the left in a substantially L shape in side view.
(2-3) Developing Electrode The developing electrode 98 is made of a conductive resin material such as conductive POM (polyacetal) and is configured to be electrically connected to the developing roller 4. The development electrode 98 includes a development coating portion 126, a development contact portion 127, a connection portion 131, a development flat plate portion 128, an upper extension portion 129, and a lower extension portion 130.

  The development coating portion 126 is configured to come into contact with the development roller shaft 11. The development coating portion 126 is disposed at a substantially center in the vertical direction in the rear portion of the development electrode 98. The development coating portion 126 has a substantially thick plate shape that is substantially rectangular in side view and has a thickness in the left-right direction. The development coating portion 126 includes a development roller shaft insertion hole 133.

  The developing roller shaft insertion hole 133 penetrates the substantially central portion of the development coating portion 126 in a side view in a substantially circular shape in a side view. The inner diameter of the developing roller shaft insertion hole 133 is substantially the same as the outer diameter of the developing roller shaft 11.

  The right surface of the development coating portion 126 excluding the development roller shaft insertion hole 133 is defined as a development coating flat surface 134. The development coating flat surface 134 extends flat along the front-rear direction.

  Further, the right end edge at the rear end portion of the development coating portion 126 is inclined leftward toward the front, and this inclined surface is defined as a first development guide surface 135. In other words, the front edge of the first development guide surface 135 is continuous with the rear edge of the development coating flat surface 134. In other words, the first development guide surface 135 is defined at the end of the development coating portion 126 opposite to the connection portion 131 described later.

  The development contact portion 127 is disposed substantially at the center in the front-rear direction of the development electrode 98. The development contact portion 127 is disposed adjacent to the development coating portion 126 in the front. The development contact portion 127 protrudes leftward with respect to the development coating portion 126. The development contact portion 127 has a substantially rectangular tube shape whose right end is closed.

  The right surface of the development contact portion 127 is defined as a development contact flat surface 138. The development contact flat surface 138 is parallel to the development coating flat surface 134 and extends flat along the front-rear direction. The development contact flat surface 138 is, for example, 0.5 mm or more, preferably 1.0 mm or more, and is, for example, 5.0 mm or less, preferably 2.0 mm or less than the development coating flat surface 134. Is placed on the right. Specifically, the development contact flat surface 138 is disposed 1.4 mm to the right of the development coating flat surface 134.

  Further, the rear upper end portion of the development contact portion 127 extends along a direction connecting the rear lower portion and the front upper portion, and further slopes rightward toward the front lower portion, and this inclined surface is the second developing surface. A guide surface 139 is defined.

  The connecting portion 131 is disposed between the development coating portion 126 and the development contact portion 127 in the front-rear direction so as to connect the development coating portion 126 and the development contact portion 127. The connecting portion 131 extends along a direction connecting the rear upper side and the front lower side. In other words, the connecting portion 131 extends in a direction substantially perpendicular to the mounting direction of the developing cartridge 1 to the printer 15.

  And the right end edge of the connection part 131 inclines rightward toward the front upper direction, and this inclined surface is demarcated as the connection guide surface 140. FIG. That is, the connection guide surface 140 is inclined so as to be away from the right side wall 35.

  Further, the connection guide surface 140 faces a different direction from any of the first protection guide surface 121, the second protection guide surface 122, the first development guide surface 135, and the second development guide surface 139. The vertical dimension of the connection guide surface 140 is shorter than the vertical dimension of the first protective guide surface 121 of the first protective unit 118 described above. Further, the angle formed by the connection guide surface 140 with the right side wall 35 is smaller than the angle formed by the first protective guide surface 121 with the right side wall 35.

  The development flat plate portion 128 is a front portion of the development electrode 98 and is disposed adjacent to the front of the development electrode 98. The development flat plate portion 128 has a substantially plate shape that is substantially rectangular in a side view and extends forward from the front lower portion at the left end of the development contact portion 127. The development flat plate portion 128 has a third through hole 143.

  The third through hole 143 is disposed in the front portion of the developing flat plate portion 128. The third through hole 143 penetrates the developing flat plate portion 128 in a substantially circular shape when viewed from the side. The inner diameter of the third through hole 143 is substantially the same as the outer diameter of the electrode support shaft 52.

  The upward extending portion 129 has a substantially plate shape that is substantially rectangular in a side view and extends upward from the left end edge of the upper end portion of the development coating portion 126.

The downward extending portion 130 has a substantially plate shape that is substantially rectangular in a side view and extends downward from the left end edge of the lower end portion of the development coating portion 126.
(2-4) Assembly State of Supply Electrode, Insulating Member, and Developing Electrode As shown in FIGS. 3B and 5A, the supply electrode 95 has the first through hole 105 that receives the electrode support shaft 52 and the supply insertion portion 103. Is positioned on the right side wall 35 by receiving the right end portion of the supply roller shaft 13 of the supply roller 5.

  At this time, as shown in FIGS. 5A and 5B, the supply contact portion 101 overlaps the front portion 60 of the first protruding wall 53 when projected in the left-right direction. Further, as shown in FIGS. 3B and 6A, the supply flat surface 107 of the supply contact portion 101 faces the rear surface of the second protruding wall 54. More specifically, the second protruding wall 54 covers the entire supply flat surface 107 of the supply contact portion 101. In other words, the supply contact portion 101 is disposed at a distance from the supply roller shaft 13 in the front-rear direction.

  As shown in FIGS. 3B and 4, the developing electrode 98 has a third through hole 143 that overlaps the second through hole 115 with respect to the insulating member 97 in a side view, and the developing roller shaft insertion hole 133 is formed. Further, it is assembled from the right side so as to overlap with the developing shaft insertion port 114.

  The insulating member 97 and the developing electrode 98 assembled in this way are assembled to the right side wall 35 on which the supply electrode 95 is positioned. Specifically, the insulating member 97 and the development electrode 98 have the third through hole 143 and the second through hole 115 that receive the electrode support shaft 52, and the development roller shaft insertion hole 133 and the development shaft insertion port 114. The right end portion of the developing roller shaft 11 is received, and the supply shaft collar 116 receives the right end portion of the supply roller shaft 13. Further, the engaging portion 111 is assembled so as to come into contact with the rear right end portion of the lower wall 37 of the developing frame 2 from behind and below.

  In this way, the insulating member 97 and the developing electrode 98 are positioned with respect to the right side wall 35 as shown in FIG. 3A.

  The supply electrode 95, the insulating member 97, and the development electrode 98 are collectively fixed to the right side wall 35 by screwing the electrode support shaft 52. That is, the supply electrode 95, the insulating member 97, and the developing electrode 98 are adjacently arranged in the left-right direction.

  At this time, the first protective portion 118 of the insulating member 97 is disposed adjacent to the rear of the supply contact portion 101, and the second protective portion 119 of the insulating member 97 is disposed adjacent to the lower portion of the supply contact portion 101. That is, the first protection part 118 and the second protection part 119 are configured to protect the supply contact part 101 of the supply electrode 95.

  In addition, the first protection portion 118 of the insulating member 97 is disposed adjacent to the upper side of the development contact portion 127, and the second protection portion 119 of the insulation member 97 is disposed adjacent to the front of the development contact portion 127. That is, the first protection part 118 and the second protection part 119 are configured to protect the development contact part 127 of the development electrode 98.

  Further, the right end surface of the developing roller shaft 11 and the developing coating flat surface 134 of the developing electrode 98 are flush with each other.

Further, the left end portion of the first protection portion 118 of the insulating member 97 is disposed so as to face the bent portion 59 of the first protruding wall 53 in the front-rear direction.
4). Details of Process Cartridge The process cartridge 17 is configured by mounting the above-described developing cartridge 1 on the drum cartridge 24.

  As shown in FIGS. 2 and 7A, the drum cartridge 24 includes a drum frame 147, the photosensitive drum 25 described above, and the scorotron charger 26 described above.

  The drum frame 147 has a substantially rectangular bottomed frame shape with its lower end closed. The drum frame 147 has a rear portion defined as a drum accommodating portion 148 and a front portion defined as a developing cartridge accommodating portion 149.

  The drum housing 148 supports the photosensitive drum 25 and the scorotron charger 26.

  7A and 7B, the left and right ends of the photosensitive drum 25 protrude from the left and right ends of the drum housing portion 148 outward in the left-right direction, and the left and right sides of the drum shaft 151 And a drum body 152 covering the central portion in the direction.

  The developing cartridge housing portion 149 is configured such that the developing cartridge 1 can be attached or detached.

  When the developing cartridge 1 is attached to the developing cartridge housing portion 149 of the drum frame 147, the rear end portion of the developing roller body 12 of the developing roller 4 is the drum of the photosensitive drum 25 as shown in FIG. The front end of the main body 152 is contacted. The power supply unit 31 is arranged so as to be on the left side of the right end portion of the drum shaft 151 and on the right side of the right wall of the drum frame 147.

In this way, the process cartridge 17 is configured.
5. Details of Main Body Casing As shown in FIG. 6A, the main body casing 16 includes a first main body electrode 155 as an example of a main body electrode and a second main body electrode 156 as an example of a main body electrode.

  The first main body electrode 155 is disposed so as to contact the supply contact surface 106 of the supply contact portion 101 of the supply electrode 95 in the left-right direction in a state where the developing cartridge 1 is mounted on the main body casing 16. The first body electrode 155 is configured to be displaceable in the left-right direction, and is always urged toward the left. The first body electrode 155 is electrically connected to a power source (not shown) provided in the body casing 16.

The second main body electrode 156 is disposed so as to contact the developing contact flat surface 138 of the developing contact portion 127 of the developing electrode 98 in the left-right direction when the developing cartridge 1 is mounted on the main body casing 16. The second body electrode 156 is configured to be displaceable in the left-right direction, and is always biased toward the left. The second main body electrode 156 is electrically connected to a power source (not shown) provided in the main body casing 16.
6). Mounting of Developing Cartridge to Main Body Casing Next, the attaching / detaching operation of the developing cartridge 1 with respect to the main body casing 16 will be described.

  In order to attach the developing cartridge 1 to the main casing 16, first, as shown in FIGS. 7A and 7B, the operator stores the developing cartridge 1 in the developing cartridge storage portion 149 of the drum cartridge 24 and the process cartridge 17. Configure.

  Next, as shown in FIG. 2, the front cover 21 is opened, and the process cartridge 17 is inserted into the main body casing 16 from the front through the opening 20.

  Then, as shown in FIG. 8A, the first main body electrode 155 of the main body casing 16 is positioned behind the first protection portion 118 of the insulating member 97.

  Further, the second main body electrode 156 of the main body casing 16 is in contact with the development coating portion 126 of the development electrode 98. Then, the second body electrode 156 moves to the right while being guided by the first development guide surface 135 while being rubbed with the first development guide surface 135.

  Next, when the process cartridge 17 is further pushed into the main casing 16, the first main body electrode 155 of the main casing 16 comes into contact with the first protection portion 118 of the insulating member 97, as shown in FIG. 8B. The first body electrode 155 moves to the right while being guided by the first protection guide surface 121 while being rubbed with the first protection guide surface 121.

  The second body electrode 156 moves forward with respect to the process cartridge 17 while being rubbed against the development coating flat surface 134 of the development coating portion 126 and the right end surface of the development roller shaft 11.

  Next, when the process cartridge 17 is further pushed into the main body casing 16, as shown in FIG. 9A, the first main body electrode 155 is supplied to the right surface of the first protection portion 118 and to the supply contact portion 101 of the supply electrode 95. It moves forward relative to the process cartridge 17 while being rubbed against the surface 106.

  The second main body electrode 156 is in contact with the connection portion 131 of the developing electrode 98. The second body electrode 156 moves to the right while being guided by the connection guide surface 140 while being rubbed with the connection guide surface 140.

  Next, when the process cartridge 17 is further pushed into the main casing 16, the first main body electrode 155 contacts the supply contact surface 106 of the supply contact portion 101 from the right side as shown in FIG. 9B.

  The second body electrode 156 contacts the development contact flat surface 138 of the development contact portion 127 from the right side.

  Thus, the mounting of the process cartridge 17 on the main casing 16 is completed.

  In order to detach the developing cartridge 1 from the main casing 16, first, the developing cartridge 1 is operated in the reverse procedure to the mounting operation described above.

  Specifically, as shown in FIG. 2, the operator opens the front cover 21 and pulls the process cartridge 17 forward through the opening 20.

Then, by removing the developing cartridge 1 from the developing cartridge housing portion 149 of the drum cartridge 24, the releasing operation of the developing cartridge 1 from the main body casing 16 is completed.
7). Effect (1) According to the developing cartridge 1, as shown in FIG. 8B, when the developing cartridge 1 is mounted on the main casing 16, the first main body electrode 155 is first applied to the first protection portion 118 of the insulating member 97. Touched. Further, since the first protection unit 118 includes the first protection guide surface 121, the first body electrode 155 can be guided away from the right side wall 35.

As a result, the supply electrode 95 can be protected by the first protection unit 118, and the supply electrode 95 can be prevented from being damaged.
(2) Also, according to the developing cartridge 1, as shown in FIG. 6A, the first main body electrode 155 contacts the supply contact portion 101 in the left-right direction.

Therefore, the first body electrode 155 can be reliably brought into contact with the supply contact portion 101 of the supply electrode 95.
(3) Further, according to the developing cartridge 1, as shown in FIG. 5A, the supply roller shaft 13 and the supply contact portion 101 are arranged with an interval in the front-rear direction.

  Therefore, the supply roller shaft 13 can be prevented from being damaged due to contact with the first main body electrode 155.

On the other hand, when the supply contact portion 101 and the first main body electrode 155 come into contact with each other, power can be reliably supplied to the supply roller shaft 13.
(4) Also, according to the developing cartridge 1, as shown in FIG. 8B, when the developing cartridge 1 is attached to the main body casing 16, even if the developing cartridge 1 is inserted in a shifted state, the insulating member The supply contact portion 101 can be protected by 97 second protection portion 119.

As a result, it is possible to more reliably suppress the supply electrode 95 from being damaged.
(5) According to the developing cartridge 1, as shown in FIGS. 3A and 3B, the electrical connection between the developing electrode 98 and the supply electrode 95 can be blocked by the insulating member 97, while the first By having the protection part 118 and the second protection part 119 integrally, the number of parts can be reduced.
(6) Further, according to the developing cartridge 1, not only the supply electrode 95 but also the developing electrode 98 is protected by the first protective portion 118 and the second protective portion 119 as shown in FIGS. 3A and 3B. be able to.
(7) Also, according to the developing cartridge 1, as shown in FIGS. 5A and 6A, the front of the supply contact portion 101 is protected, so that the supply electrode 95 can be further protected.
(8) Further, according to the developing cartridge 1, as shown in FIG. 1B, the second projecting wall 54 can be integrally formed with the base frame 32 of the developing frame 2, so that the number of parts can be reduced. it can.
(9) According to the developing cartridge 1, as shown in FIG. 6A, the first main body electrode 155 can be reliably brought into contact with the supply contact surface 106 that extends flat in the front-rear direction.
(10) According to the developing cartridge 1, as shown in FIG. 6A, the developing electrode 98 and the second main body electrode 156 can be reliably brought into contact with each other to supply power to the developing roller 4.
(11) Also, according to the developing cartridge 1, as shown in FIG. 3A, the supply electrode 95 and the developing electrode 98 are made of a conductive resin material, so that each electrode can be easily molded. Further, it is possible to reliably supply power to the developing roller 4 and the supply roller 5.
8). Second Embodiment With reference to FIG. 10, a second embodiment of the developing cartridge of the present invention will be described. In the second embodiment, members similar to those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In the first embodiment described above, as shown in FIG. 1B, the connecting portion 55 includes one first rib 68 and a plurality of, that is, two second ribs 69.

  On the other hand, in the second embodiment, as shown in FIG. 10, the connecting portion 55 includes a plurality of, that is, two first ribs 160 and one second rib 161.

  The plurality of first ribs 160 are arranged in parallel at intervals in the vertical direction. The lower first rib 160 has a substantially plate shape that connects a substantially central portion in the front-rear direction at the right end edge of the right flange 45 and the front surface of the covering right end 67 of the second protruding wall 54. The upper first rib 160 has a substantially plate shape that connects the right surface of the second rib 161 described later and the front surface of the covering right end portion 67 of the second protruding wall 54.

  The right end edges of the plurality of first ribs 160 extend to the right end edge of the second protruding wall 54. The front right portion of the first rib 68 is inclined rightward from the front to the rear, and the inclined surface is defined as a first inclined surface 162. Accordingly, the lower first rib 160 has a substantially triangular shape in plan view, and the upper first rib 160 has a substantially trapezoidal shape in plan view.

  The second rib 161 has a substantially plate shape that connects the upper surface of the lower first rib 160 and the front surface of the second protruding wall 54. That is, the second rib 161 overlaps the front portion 60 of the first protruding wall 53 when projected in the front-rear direction. The front upper portion of the second rib 161 is inclined upward from the front toward the rear, and the inclined surface is defined as a second inclined surface 163. Accordingly, the second rib 161 has a substantially triangular shape in a side view.

In such a second embodiment, the same operational effects as those of the first embodiment described above can be obtained.
9. Modification The above-described developing cartridge 1 is an embodiment of the developing cartridge of the present invention, and the present invention is not limited to the above-described embodiment.

  For example, in the above-described embodiment, the development electrode 98 includes the development coating portion 126, the development contact portion 127, and the connection portion 131 as one body, but each may be configured as a separate member. For example, in the development electrode 98, the development coating portion 126 and the development contact portion 127 may be formed from a conductive resin material, and the connection portion 131 made of a metal material may be connected therebetween.

  In addition, for example, the connecting portion 131 may be formed from an insulating material, and the developing roller shaft 11 and the developing contact portion 127 may be configured to be connected by a conductive material disposed in a different manner from the connecting portion 131. it can.

  Further, in the above-described embodiment, the supply electrode 95 has the supply contact portion 101, the supply fixing portion 102, and the supply insertion portion 103 as one body, but each may be configured as a separate member. For example, in the supply electrode 95, the supply contact portion 101 and the supply insertion portion 103 may be formed from a conductive resin material, and connected between them by a supply fixing portion 102 made of a metal material. .

  Further, for example, the supply fixing portion 102 is formed from an insulating material, and the supply roller shaft 13 and the supply contact portion 101 are connected to each other by a conductive material arranged in a different manner from the supply fixing portion 102. You can also.

  Further, the development coating portion 126 may be configured to cover at least a part of the circumferential surface of the developing roller shaft 11 instead of the entire circumferential surface of the developing roller shaft 11.

  Further, the development coating portion 126 may be configured to cover the right end surface of the developing roller shaft 11 without exposing the right end surface of the developing roller shaft 11.

  Further, for example, instead of the developing roller 4 described above, a developer carrier such as a developing sleeve or a brush roller can be applied.

  Further, the development coating flat surface 134 and the development contact flat surface 138 may be configured to have unevenness in the left-right direction within a range that does not hinder mounting on the printer 15.

  Moreover, the angle which the connection guide surface 140 makes with the right side wall 35 can be appropriately set within a range of 1 ° or more and less than 90 °.

  In the embodiment described above, the base frame 32 has the first projecting wall 53 and the second projecting wall 54 integrally. However, the first projecting wall 53 and the second projecting wall 54 are separated from each other. It can also be configured as.

  Further, the first projecting wall 53 and the second projecting wall 54 may be provided in the cover frame 33 instead of the base frame 32.

  Moreover, the 2nd protrusion wall 54 should just coat | cover at least one part of the supply flat surface 107 instead of the whole supply flat surface 107 of the supply contact part 101. FIG.

  Moreover, the 1st protrusion wall 53 and the 2nd protrusion wall 54 should just coat | cover at least one part of the supply contact part 101 in an up-down direction.

DESCRIPTION OF SYMBOLS 1 Developing cartridge 2 Developing frame 4 Developing roller 5 Supply roller 13 Supply roller shaft 16 Main body casing 35 Right side wall 54 Second protruding wall 95 Supply electrode 97 Insulation member 98 Development electrode 101 Supply contact portion 106 Supply contact surface 118 First protection portion 119 Second protective part 121 First protective guide surface 155 First main body electrode 156 Second main body electrode

Claims (9)

A developing cartridge that can be mounted in a mounting direction with respect to an image forming apparatus main body having a first main body electrode and a second main body electrode therein,
A developing roller configured to rotate about a rotation axis along a first direction orthogonal to the mounting direction;
A supply roller configured to rotate about a rotation axis along the first direction and configured to supply developer to the development roller;
A housing having a wall portion orthogonal to the first direction and containing a developer therein;
A developing electrode disposed adjacent to the wall in the first direction and electrically connected to the developing roller;
A supply electrode disposed adjacent to the wall portion and electrically connected to the supply roller in the first direction;
A first protection part disposed downstream of the supply direction with respect to the supply electrode and protecting the supply electrode;
The supply electrode is a supply contact portion configured to come into contact with the first main body electrode in the first direction in a state where the developing cartridge is mounted on the main body of the image forming apparatus. A supply contact portion located upstream of the development electrode;
The developing electrode is
A developing contact portion configured to come into contact with the second main body electrode in the first direction in a state where the developing cartridge is mounted on the main body of the image forming apparatus;
A guide surface that guides the second main body electrode toward the developing contact portion when the developing cartridge is mounted on the main body of the image forming apparatus,
The first protection portion is an inclined surface that guides the first main body electrode toward the supply contact portion when the developing cartridge is mounted on the image forming apparatus main body, and is upstream of the mounting direction. As it goes, it has an inclined surface that inclines away from the wall portion in the first direction,
The developing cartridge according to claim 1, wherein a length of the inclined surface in a second direction orthogonal to both the first direction and the mounting direction is longer than a length of the guide surface in the second direction. The supply roller includes a supply roller shaft extending along the first direction,
2. The developing cartridge according to claim 1, wherein the supply roller shaft and the supply contact portion are spaced apart from each other in the mounting direction. The second contact portion is disposed adjacent to the development contact portion upstream in the mounting direction and is disposed adjacent to the supply contact portion in the second direction. Item 3. The developing cartridge according to Item 1 or 2. An insulating member for interrupting electrical connection between the developing electrode and the supply electrode;
The developing cartridge according to claim 3, wherein the insulating member integrally includes the first protective portion and the second protective portion. The first protection part, to the development electrode, characterized in that it is arranged adjacent in the second direction, the developing cartridge according to claim 3 or 4.   6. The developing cartridge according to claim 1, further comprising a third protection portion disposed adjacent to the supply contact portion upstream in the mounting direction. 7.   The developing cartridge according to claim 6, wherein the housing integrally includes the third protection unit.   The said supply contact part has a supply contact surface comprised so that it may intersect with the said 1st main body electrode orthogonally to the said 1st direction, The one of Claim 1 thru | or 7 characterized by the above-mentioned. The developing cartridge according to Item. The developing cartridge according to claim 1, wherein the developing electrode and the supply electrode are made of a conductive resin material.

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