JP2021128279A - Developing cartridge - Google Patents

Abstract

To prevent toner from being accumulated in the step between a side seal and a side edge seal.SOLUTION: A developing cartridge 28 comprises: a housing 50; a developing roller 31 that has a rotation shaft extending in a first direction and is rotatably supported by the housing; a side seal 300 that is located between an end of the developing roller and the housing; a layer thickness regulation blade 100 having a contact part 120 that is in contact with the developing roller; a side edge seal 130 that is in contact with an end face in the first direction of the contact part; and a sheet-like lower seal 200, the lower seal being located separate from the layer thickness blade in a second direction orthogonal to the first direction. The side edge seal has a first end 133 extending in the first direction and a second end 132 closer to the lower seal than the first end in the second direction. The second end has a first inclined part 132A that is sandwiched between the side seal and the developing roller and inclined to be separated from the lower seal in the second direction as toward the inside in the first direction.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a developing cartridge provided with a side seal provided between the axial end of the developing roller and the housing.

Conventionally, a layer thickness regulating blade having a developing roller rotatably provided in a housing, a side seal provided between an axial end of the developing roller and the housing, and a contact portion in contact with the developing roller. A side edge seal that contacts the axial end face of the contact portion and a sheet-shaped lower seal that contacts the developing roller and is located away from the layer thickness regulating blade in the direction orthogonal to the axial direction. A developing cartridge provided is known (see Patent Document 1). The side edge seal has a first end extending in the axial direction and a second end closer to the lower seal than the first end in the direction orthogonal to the axial direction. The second end of the side edge seal is sandwiched between the side seal and the developing roller and extends parallel to the axial direction of the developing roller.

JP 2016-130791

However, if the second end of the side edge seal extends parallel to the axial direction of the developing roller, toner may accumulate on the step between the side seal and the side edge seal and solidify. Then, the surface of the developing roller is damaged by the toner solidified in the step, and the toner may leak to the outside of the developing cartridge from between the damaged portion and the side seal.

Therefore, an object of the present disclosure is to provide a developing cartridge in which toner is suppressed from accumulating on a step between a side seal and a side edge seal.

In order to solve the above problems, the developing cartridge of the present disclosure includes a housing for accommodating toner, a developing roller having a rotating shaft extending in the first direction and rotatably supported by the housing, and the above. A side seal located between the end of the developing roller and the housing in the first direction, a blade plate extending in the first direction, and a blade plate protruding from the blade plate toward the developing roller and contacting the developing roller. A layer thickness regulating blade having a contact portion, a side edge seal that contacts the end face of the contact portion in the first direction, and a sheet-shaped lower seal that extends in the first direction and contacts the developing roller. A lower seal located away from the layer thickness regulating blade in the second direction orthogonal to the first direction is provided. The side edge seal has a first end extending in the first direction and a second end closer to the lower seal than the first end in the second direction, and the second end is the side seal. It is a first inclined portion sandwiched between the developing roller and the developing roller, and has a first inclined portion which is inclined so as to be separated from the lower seal in the second direction as it goes inward in the first direction.

According to such a configuration, the toner that has entered the step between the side seal and the side edge seal is guided inside in the first direction so as to return to the inside of the housing of the developing cartridge, and the step between the side seal and the side edge seal. It is possible to prevent toner from accumulating on the surface.

The developing roller has a developing roller shaft extending in the first direction and a roller portion located on the peripheral surface of the developing roller shaft, and the roller portion comes into contact with at least a part of the first inclined portion. You may be doing it.

The contact portion may be made of rubber.

The side edge seal may be fixed to the blade plate.

According to this, for example, as compared with the case where the side edge seal is fixed to the side seal or the like, the contact portion and the side edge seal are more easily brought into contact with each other, and the toner leaks to the outside of the developing cartridge through the gap between the side edge seal and the contact portion. Can be suppressed.

The side seal has a plurality of grooves on the surface of the peripheral surface of the developing roller that contacts the end portion in the first direction, and the grooves are formed in the second direction as they go inward in the first direction. It is desirable that the first inclined portion is inclined away from the lower seal, and the inclination angle of the first inclined portion with respect to the first direction is smaller than the inclination angle of the groove with respect to the first direction.

According to this, the toner that has entered the step between the side seal and the side edge seal is better compared to the case where the inclination angle of the first inclined portion with respect to the first direction is larger than the inclination angle of the groove with respect to the first direction. It can be guided inside the first direction.

The lower seal has a third end extending in the first direction and a fourth end closer to the side edge seal than the third end in the second direction, and the fourth end is the side seal. And the second inclined portion sandwiched between the developing rollers and having a second inclined portion that inclines toward the side edge seal in the second direction as it goes inward in the first direction. good.

According to this, it is possible to prevent the toner that has entered the step between the side seal and the lower seal from moving toward the outside of the developing cartridge to the outside in the first direction.

It is desirable that the inclination angle of the first inclined portion with respect to the first direction is smaller than the inclination angle of the second inclined portion with respect to the first direction.

The inclination angle of the second inclined portion with respect to the first direction is preferably 30 ° to 60 °.

According to this, it is possible to better prevent the toner that has entered the step between the side seal and the lower seal from moving to the outside in the first direction.

The inclination angle of the first inclined portion with respect to the first direction is preferably 5 ° to 45 °.

According to this, the toner that has entered the step between the side seal and the side edge seal can be better guided to the inside in the first direction.

The first inclined portion may extend over a part of the second end of the side edge seal.

The first inclined portion may extend over the entire length of the second end of the side edge seal.

According to this, the toner can be guided inward in the first direction over a wider range in the first direction than when the first inclined portion extends over a part of the second end of the side edge seal. can.

According to the developing cartridge of the present disclosure, the toner that has entered the step between the side seal and the side edge seal is guided inside in the first direction so as to return to the developing cartridge, and the toner is guided to the step between the side seal and the side edge seal. Can be suppressed from accumulating.

It is a figure which shows the schematic structure of the laser printer provided with the development cartridge which concerns on embodiment of this disclosure. It is sectional drawing of the process cartridge. It is a perspective view which shows the structure around the opening of a housing. It is an exploded perspective view which shows the side seal simply. It is a partial cross-sectional view of the housing at the place where the side seal, the side edge seal and the lower seal are provided. It is the schematic explanatory view (a) which shows the arrangement of the side seal, the side edge seal and the lower seal, and XX cross-sectional view (b) of (a). It is the schematic explanatory drawing which shows the arrangement of the side seal, the side edge seal and the lower seal which concerns on other embodiment.

Next, one embodiment of the present disclosure will be described in detail with reference to the drawings as appropriate. In the following description, first, the overall configuration of the laser printer will be briefly described, and then the details of the feature portions of the present disclosure will be described.

Further, in the following description, the direction will be described with reference to the user when the laser printer 1 is used. That is, the left side in FIG. 1 is "front", the right side is "rear", the back side is "left", and the front side is "right". Further, the vertical direction in FIG. 1 is defined as "up and down".

As shown in FIG. 1, the laser printer 1 includes a feeder unit 4 for feeding paper 3 into the main body casing 2, an image forming unit 5 for forming an image on the paper 3, and the like.

The feeder portion 4 includes a paper feed tray 6 that is detachably attached to the bottom of the main body casing 2 and a paper pressing plate 7 provided in the paper feed tray 6. Further, the feeder unit 4 includes various rollers 11 for transporting the paper 3 and removing paper dust. Then, in the feeder unit 4, the paper 3 in the paper feed tray 6 is moved upward by the paper pressing plate 7 and conveyed to the image forming unit 5 by various rollers 11.

The image forming unit 5 includes a scanner unit 16, a process cartridge 17, a fixing unit 18, and the like.

The scanner unit 16 is provided in the upper part of the main body casing 2 and includes a laser emitting unit (not shown), a polygon mirror 19 driven to rotate, lenses 20, 21, reflectors 22, 23, 24 and the like. .. In the scanner unit 16, the laser beam is irradiated on the surface of the photosensitive drum 27 by high-speed scanning through the path shown by the chain line in the figure.

The process cartridge 17 has a structure in which the front cover 2A provided on the front side of the main body casing 2 is detachably attached to the main body casing 2 by appropriately opening the front cover 2A. The process cartridge 17 is mainly composed of a developing cartridge 28 and a drum unit 39.

The developing cartridge 28 is detachable from the main body casing 2 while being mounted on the drum unit 39. As shown in FIG. 2, the developing cartridge 28 includes a developing roller 31, a layer thickness regulating blade 100, a supply roller 33, and a housing 50 that supports these members. Further, the housing 50 has a toner storage chamber 34 in which toner is stored.

The developing roller 31 has a developing roller shaft 31A extending in the first direction (left-right direction) and a roller portion 31B located on the peripheral surface of the developing roller shaft 31A. The developing roller shaft 31A may penetrate the roller portion 31B, or may be provided at each end of the roller portion 31B.

In the developing cartridge 28, the toner stored in the toner accommodating chamber 34 is agitated by the agitator 34A and then supplied to the developing roller 31 by the supply roller 33. At this time, between the supply roller 33 and the developing roller 31. It is triboelectrically charged. The toner carried on the peripheral surface of the developing roller 31 enters between the layer thickness regulating blade 100 and the developing roller 31 as the developing roller 31 rotates, and is further triboelectrically charged to form a thin layer having a constant thickness. Is supported on the developing roller 31.

The drum unit 39 includes a photosensitive drum 27, a scorotron type charger 29, and a transfer roller 30. Then, in the drum unit 39, the surface of the photosensitive drum 27 is uniformly positively charged by the scorotron type charger 29, and then exposed by high-speed scanning of the laser beam from the scanner unit 16. As a result, the potential of the exposed portion is lowered, and an electrostatic latent image based on the image data is formed.

Next, the rotation of the developing roller 31 supplies the toner supported on the developing roller 31 to the electrostatic latent image formed on the surface of the photosensitive drum 27, and the toner image is formed on the surface of the photosensitive drum 27. It is formed. After that, the paper 3 is conveyed between the photosensitive drum 27 and the transfer roller 30, so that the toner image supported on the surface of the photosensitive drum 27 is transferred onto the paper 3.

As shown in FIG. 1, the fixing portion 18 includes a heating roller 41 and a pressure roller 42 that is located opposite to the heating roller 41 and pressurizes the heating roller 41. Then, in the fixing portion 18 configured in this way, the toner transferred onto the paper 3 is heat-fixed while the paper 3 passes between the heating roller 41 and the pressure roller 42. The paper 3 heat-fixed by the fixing portion 18 is conveyed to a paper ejection roller 45 arranged on the downstream side of the fixing portion 18, and is ejected from the paper ejection roller 45 onto the paper ejection tray 46.

Next, the configuration of the developing cartridge 28 will be described in detail. Note that FIG. 3 shows a state in which the developing roller 31 is removed from the housing 50. Further, since the configuration around the opening 51 of the developing cartridge 28 is substantially the same at the left end portion and the right end portion, only the left end portion is shown in the drawings referred to in the following description.

As shown in FIG. 3, the housing 50 of the developing cartridge 28 has an opening 51 on the side wall on the rear side, and the developing roller 31 having a rotation axis extending in the first direction (left-right direction) closes the opening 51. It is rotatably supported by the housing 50 in a flexible shape. The lower seal 200 is located on the lower edge of the opening 51, and the side seals 300 are located on the left and right edges of the opening 51. Further, a layer thickness regulating blade 100 is located on the upper edge of the opening 51 so as to extend in the first direction. The lower seal 200 is located away from the layer thickness regulating blade 100 in the second direction orthogonal to the first direction. The developing roller 31 rotates in the direction of the arrow shown in the figure. That is, the developing roller 31 rotates so as to be in sliding contact with the lower seal 200, the side seal 300, and the layer thickness regulating blade 100 in this order.

The layer thickness regulating blade 100 has a blade plate 110 and a blade rubber portion 120 as an example of a contact portion fixed to the blade plate 110.

The blade plate 110 is a plate-shaped sheet metal extending in the first direction. The blade plate 110 is fixed to the housing 50 above the developing roller 31, and its tip is located in front of the developing roller 31.

The blade rubber portion 120 is a rubber member that is elongated in the first direction and smaller in size in the first direction than the blade plate 110, and is made of, for example, silicon rubber or urethane rubber. The blade rubber portion 120 projects from the surface facing the developing roller 31 at the tip of the blade plate 110 and is in contact with the developing roller 31.

The blade rubber portion 120 is provided with recesses 121 recessed from the tip at both ends in the first direction. The recess 121 is separated from the end surface 120A of the blade rubber portion 120 in the first direction by a predetermined distance. Further, the portion of the blade rubber portion 120 in which the recess 121 is not formed has a substantially semicircular cross section, and is in contact with the developing roller 31 at the arcuate portion. The portion of the recess 121 has a cross section of approximately a quarter circle, and is in contact with the developing roller 31 at a pointed portion at the end of the arc. As a result, the bottom portion of the recess 121 is more angular than the portion of the blade rubber portion 120 other than the recess 121, so that the toner supported on the developing roller 31 can be more easily scraped off.

The side seal 300 is arranged between the housing 50 and both ends of the developing roller 31 in the first direction in a substantially C shape following the outer peripheral shape of the developing roller 31, and is in contact with the developing roller 31. .. The side seal 300 has a contact layer 310 that contacts the peripheral surface of the roller portion 31B of the developing roller 31, and a base layer 320 that supports the contact layer 310.

The contact layer 310 is, for example, a substantially rectangular member formed of a woven fabric member such as a pile woven fabric, and extends along the rotation direction of the developing roller 31 (hereinafter, simply referred to as “rotation direction”). As shown in FIG. 4, the contact layer 310 has a plurality of grooves G on the surface 311 of the peripheral surface of the roller portion 31B of the developing roller 31 that comes into contact with the end portion in the first direction. The groove G is composed of, for example, irregularities generated when the yarn is woven. The groove G is inclined with respect to the first direction so as to move inward in the first direction and away from the lower seal 200 in the second direction.

The base layer 320 is a layer that supports the contact layer 310. The base layer 320 is located farther from the developing roller 31 than the contact layer 310. The base layer 320 is made of an elastic body such as urethane sponge. The base layer 320 is elastically deformable and functions to press the contact layer 310 against the peripheral surface of the roller portion 31B of the developing roller 31. The contact layer 310 and the base layer 320 are adhered by the double-sided tape T.

As shown in FIG. 5, the side seal 300 is located between the housing 50 and the layer thickness regulating blade 100. The side seal 300 is fixed to the housing 50 by attaching the base layer 320 to the housing 50 with double-sided tape or the like.

Returning to FIG. 3, the lower seal 200 is a sheet-like member made of a resin such as polyethylene terephthalate, which extends along the first direction of the developing roller 31 and is in contact with the developing roller 31. The lower seal 200 is formed longer in the first direction than the lower edge of the opening 51, and is positioned so as to come into contact with the side seal 300. This prevents toner from leaking between the developing roller 31 and the lower seal 200, and between the side seal 300 and the lower seal 200.

The lower seal 200 has a third end 220 extending in the first direction and a fourth end 210 closer to the side edge seal 130 than the third end 220 in the second direction. The fourth end 210 has a second inclined portion 210A that inclines toward the side edge seal 130 in the second direction as it goes inward in the first direction, and a second straight portion 210B that extends parallel to the first direction. A part of the second straight portion 210B and the second inclined portion 210A are sandwiched between the side seal 300 and the developing roller 31, and are in contact with the roller portion 31B and the contact layer 310 of the developing roller 31 (see FIG. 5). ..

A side edge seal 130 is attached to the layer thickness regulating blade 100. The side edge seal 130 is, for example, a substantially rectangular member formed of a non-woven fabric or the like, and is fixed to the front surface of the blade plate 110 and is in contact with the developing roller 31. The side edge seal 130 is located over a range from a position above the blade rubber portion 120 to a position below the blade rubber portion 120. That is, the first end 133 of the side edge seal 130 is farther from the lower seal 200 than the blade rubber portion 120. Further, the second end 132 of the side edge seal 130 is closer to the lower seal 200 than the blade rubber portion 120. The portion of the side edge seal 130 extending below the blade rubber portion 120 is positioned so as to come into contact with the side seal 300. In the side edge seal 130, the inner side surface 131, which is the inner end surface in the first direction, is in contact with the end surface 120A in the first direction of the blade rubber portion 120. As a result, toner is suppressed from leaking between the left and right ends of the blade rubber portion 120 and the side edge seal 130.

The side edge seal 130 has a first end 133 extending in the first direction and a second end 132 closer to the lower seal 200 in the second direction than the first end. The second end 132 has a first inclined portion 132A that inclines away from the lower seal 200 in the second direction as it goes inward in the first direction, and a first straight portion 132B that extends parallel to the first direction. That is, the first inclined portion 132A extends over a part of the second end 132 of the side edge seal 130. The second end 132 is sandwiched between the side seal 300 and the developing roller 31, and is in contact with the roller portion 31B and the contact layer 310 of the developing roller 31 (see FIG. 5).

As shown in FIGS. 6A and 6B, the groove G of the side seal 300 is inclined at an inclination angle θ1 with respect to the first direction. The second inclined portion 210A of the lower seal 200 is inclined at an inclination angle θ2 with respect to the first direction. The tilt angle θ1 is preferably 30 ° to 60 °, for example 45 °.

The tilt angle θ2 is preferably 30 ° to 60 °, for example 45 °. By setting the inclination angle θ2 to such a size, it is possible to better prevent the toner that has entered the step between the side seal 300 and the lower seal 200 from moving to the outside in the first direction.

The first inclined portion 132A of the side edge seal 130 is inclined at an inclination angle θ3 with respect to the first direction. The tilt angle θ3 is smaller than the tilt angle θ1 and the tilt angle θ2. The tilt angle θ3 is preferably 5 ° to 45 °, for example 6 °. According to this, the toner that has entered the step between the side seal 300 and the side edge seal 130 can be better guided inward in the first direction.

It is desirable that the inclination angle θ2 is the same as the inclination angle θ1. That is, it is desirable that the second inclined portion 210A is inclined along the groove G. When the second inclined portion 210A is along the groove G, when the lower seal 200 is pressed against the contact layer 310 of the side seal 300 by the developing roller 31, the second inclined portion 210A enters the groove G of the contact layer 310. be able to. As a result, it is possible to suppress the formation of a step between the contact layer 310 and the second inclined portion 210A of the lower seal 200. In the present embodiment, the entire second inclined portion 210A is located on the side seal 300, and the end portion of the second straight portion 210B is located on the side seal 300.

Next, the effects of the developing cartridge 28 according to the embodiment will be described.
When the developing roller 31 is driven, the toner supplied from the opening 51 may enter between the peripheral surface of the roller portion 31B of the developing roller 31 and the contact layer 310 of the side seal 300. As shown in FIG. 6A, the toner that has entered between the peripheral surface of the roller portion 31B and the contact layer 310 enters the groove G as the developing roller 31 rotates. After that, as the developing roller 31 rotates, the toner moves inward in the first direction along the groove G, and is finally discharged from the inner end of the groove G in the first direction to the side. It is returned to the inside of the seal 300 in the first direction.

Here, when the side edge seal 130 does not include the first inclined portion 132A, the toner that has entered the groove G accumulates at the step between the side seal 300 and the side edge seal 130 as the developing roller 31 rotates. It may solidify and become a starting point for toner to leak to the outside of the developing cartridge 28. On the other hand, in the present embodiment, since the side edge seal 130 is provided with the first inclined portion 132A, the toner accumulated in the step between the side seal 300 and the side edge seal 130 is put into the housing of the developing cartridge 28. By guiding the toner inward in the first direction so as to return, it is possible to prevent toner from accumulating on the step between the side seal 300 and the side edge seal 130.

When the lower seal 200 does not include the second inclined portion 210A, toner enters into the gap created by the step between the lower seal 200 and the side seal 300 as the developing roller 31 rotates, and the toner enters from the inside in the first direction. There is a risk of leakage to the outside of the developing cartridge 28 along one direction. On the other hand, in the present embodiment, since the lower seal 200 is provided with the second inclined portion 210A, the gap in the first direction caused by the step between the side seal 300 and the lower seal 200 is shortened, and the gap between the side seal 300 and the lower seal 200 is shortened. It is possible to prevent the toner that has entered the step of the development cartridge 28 from moving to the outside in the first direction toward the outside of the developing cartridge 28.
Further, by providing the second inclined portion 210A, the contact area between the side seal 300 and the developing roller 31 can be increased. When there is a groove G on the surface of the contact layer 310 of the side seal 300 as in the present embodiment, the side seal 300 is utilized by utilizing the groove G on the contact surface increased by providing the second inclined portion 210A. And the toner that has entered between the developing rollers 31 can be moved inward in the first direction.

Further, since the side edge seal 130 is fixed to the blade plate 110, both the blade rubber portion 120 and the side edge seal 130 are directly fixed to the blade plate 110. Therefore, for example, the side edge seal 130 is the side seal 300 or the like. It is easier to bring the blade rubber portion 120 and the side edge seal 130 into contact with each other as compared with the case where the blade rubber portion 120 and the side edge seal 130 are fixed to each other, and it is possible to prevent the toner from leaking to the outside of the developing cartridge 28 through the gap between the side edge seal 130 and the blade rubber portion 120. can.

Since the inclination angle θ3 of the first inclined portion 132A with respect to the first direction is smaller than the inclination angle θ1 of the groove G with respect to the first direction, the side seal 300 and the side seal 300 are compared with the case where the inclination angle θ3 is larger than the inclination angle θ1. The toner that has entered the step with the side edge seal 130 can be better guided inward in the first direction.

The present disclosure is not limited to the above-described embodiment, and can be used in various forms as illustrated below.
For example, in the above embodiment, the first inclined portion 132A extends over a part of the second end 132 of the side edge seal 130, but as shown in FIG. 7, the first inclined portion 142A is the side edge seal 140. It may extend over the entire length of the second end 142 of. That is, the first straight line portion 132B may not be provided. According to this, the toner is guided inward in the first direction over a wider range in the first direction than when the first inclined portion 132A extends over a part of the second end 132 of the side edge seal 130. Can be done.

Further, in the above-described embodiment, a part of the second straight portion 210B and the second inclined portion 210A of the fourth end 210 of the lower seal 200 are sandwiched between the side seal 300 and the developing roller 31, as shown in FIG. In addition, only the second inclined portion 410A of the fourth end 410 of the lower seal 400 may be sandwiched between the side seal 300 and the developing roller 31, and the second straight portion 410B may not be sandwiched between the side seal 300 and the developing roller 31. .. The second inclined portion 410A extends to the inside of the side seal 300. According to this, since there is no step extending in the first direction between the lower seal 400 and the side seal 300, the toner enters the gap formed by the step between the lower seal 400 and the side seal 300 from the inside in the first direction. It can be suppressed.

Further, in the above-described embodiment, the contact layer 310 is formed of a woven fabric member, and the groove G is composed of, for example, unevenness generated when a thread is woven. It is also possible to form a groove G by forming a flocking material in which a plurality of hairs are transplanted on the surface, and depending on the length of the transplanted hairs and the direction of the hairs.

Further, in the above-described embodiment, the recess 121 is formed in the blade rubber portion 120, but the present disclosure is not limited to this, and the recess may not be formed.

Further, in the present embodiment, the present invention is applied to the laser printer 1, but the present invention is not limited to this, and the present invention may be applied to other image forming devices such as a copier and a multifunction device.

Each element described in the above-described embodiment and modification may be arbitrarily combined and implemented.

28 Development cartridge 31 Development roller 50 Housing 100 Layer thickness regulation blade 110 Blade plate 120 Blade rubber part 120A End face 130 Side edge seal 300 Side seal 132 Second end 133 First end 132A First inclined part 200 Lower seal

Claims (11)

A housing for storing toner and
A developing roller having a rotating shaft extending in the first direction and rotatably supported by the housing,
A side seal located between the end of the developing roller and the housing in the first direction,
A layer thickness regulating blade having a blade plate extending in the first direction and a contact portion protruding from the blade plate toward the developing roller and coming into contact with the developing roller.
A side edge seal that contacts the end face of the contact portion in the first direction,
A sheet-shaped lower seal extending in the first direction and in contact with the developing roller, the lower seal being located away from the layer thickness regulating blade in the second direction orthogonal to the first direction.
The side edge seal is
The first end extending in the first direction and
It has a second end that is closer to the lower seal than the first end in the second direction.
The second end is
A first inclined portion sandwiched between the side seal and the developing roller, which has a first inclined portion that inclines away from the lower seal in the second direction as it goes inward in the first direction. A characteristic development cartridge. The developing roller has a developing roller shaft extending in the first direction and a roller portion located on the peripheral surface of the developing roller shaft.
The developing cartridge according to claim 1, wherein the roller portion is in contact with at least a part of the first inclined portion. The developing cartridge according to claim 1 or 2, wherein the contact portion is made of rubber. The developing cartridge according to any one of claims 1 to 3, wherein the side edge seal is fixed to the blade plate. The side seal has a plurality of grooves on the surface of the peripheral surface of the developing roller that contacts the end portion in the first direction, and the grooves are formed in the second direction as they go inward in the first direction. It is tilted away from the lower seal and
The developing cartridge according to any one of claims 1 to 4, wherein the inclination angle of the first inclined portion with respect to the first direction is smaller than the inclination angle of the groove with respect to the first direction. .. The lower seal has a third end extending in the first direction and a fourth end closer to the side edge seal than the third end in the second direction, and the fourth end is the side seal. It is a second inclined portion sandwiched between the developing roller and the developing roller, and has a second inclined portion that inclines toward the side edge seal in the second direction as it goes inward in the first direction. The developing cartridge according to any one of claims 1 to 5. The developing cartridge according to claim 6, wherein the inclination angle of the first inclined portion with respect to the first direction is smaller than the inclination angle of the second inclined portion with respect to the first direction. The developing cartridge according to claim 6 or 7, wherein the inclination angle of the second inclined portion with respect to the first direction is 30 ° to 60 °. The developing cartridge according to any one of claims 1 to 8, wherein the inclination angle of the first inclined portion with respect to the first direction is 5 ° to 45 °. The developing cartridge according to any one of claims 1 to 9, wherein the first inclined portion extends over a part of the second end of the side edge seal. The developing cartridge according to any one of claims 1 to 9, wherein the first inclined portion extends over the entire length of the second end of the side edge seal.

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