JP2018060028A - Development device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a developing device that can move a toner on a side edge seal toward a blade rubber part, while reducing the generation of a difference in level between the side edge seal and blade rubber part.SOLUTION: A side edge seal 140 includes a first seal 150 and a second seal 160 adjacent to the first seal 150. The first seal 150 can be crushed thinner than the second seal 160 and is arranged to be in contact an end face 122 in the axial direction of a blade rubber part 120. The second seal 160 includes a fiber layer 161 formed of a plurality of fibers FB in contact with a developing roller 31, and a base sheet 162 in which the fibers FB are implanted. The plurality of fibers FB are inclined with respect to a rotation direction to be located on the inside in the axial direction toward the downstream side in the direction of rotation of the developing roller 31. The plurality of fibers FB partially project from an end edge of the base sheet 162 and overlap on the first seal 150.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a developing device including a side edge seal that contacts an end surface of a blade rubber portion of a layer thickness regulating blade.

  Conventionally, a side edge seal made of felt is known (see Patent Document 1). In this way, by using a felt of a soft material for the side edge seal, even if the blade rubber part is scraped by friction with the developing roller and the height from the blade sheet metal gradually decreases, The height of the felt can be made to follow the change in the height of the blade rubber part.

JP 2008-58565 A

  By the way, the applicant of the present application considers that the toner on the side edge seal is returned to the housing by moving it toward the blade rubber part as the developing roller rotates. However, since the plurality of fibers constituting the felt are intertwined with each other, the toner on the side edge seal made of felt is directed in one direction (blade rubber part side) by the rotation of the developing roller. It is difficult to move.

  On the other hand, when the side edge seal is made of a cut pile-like material in which a plurality of fibers are planted on the base sheet, the toner is transferred to the developing roller by tilting the plurality of fibers in one direction. Can be moved in one direction. However, cut pile materials are harder to crush than felt. Therefore, it is difficult for the height of the cut-pile-shaped side edge seal to follow the change in the height of the blade rubber part that is scraped by friction with the developing roller, and there is a step between the side edge seal and the blade rubber part. As a result, the toner may leak from the portion.

  Accordingly, the present invention provides a developing device capable of moving the toner on the side edge seal toward the blade rubber portion while suppressing a step between the side edge seal and the blade rubber portion. With the goal.

In order to solve the above-mentioned problems, a developing device according to the present invention includes a rotatable developing roller, a layer thickness regulation having a blade rubber portion that contacts a peripheral surface of the developing roller and a blade body that supports the blade rubber portion. A blade, and a side edge seal provided on the blade body and adjacent to the blade rubber portion in the axial direction of the developing roller.
The side edge seal includes a first seal that contacts the peripheral surface of the developing roller and a second seal that is adjacent to the first seal and contacts the peripheral surface of the developing roller.
The first seal can be crushed thinner than the second seal, and is disposed so as to contact the end surface of the blade rubber portion in the axial direction.
The second seal includes a fiber layer made of a plurality of fibers that come into contact with the developing roller, and a base sheet in which the fibers are implanted.
The plurality of fibers are inclined with respect to the rotation direction so as to be located on the inner side in the axial direction as going to the downstream side in the rotation direction of the developing roller.
Some of the plurality of fibers protrude from the edge of the base sheet and overlap the first seal.

  According to this configuration, the first seal that can be crushed thinner than the second seal is disposed so as to come into contact with the end surface of the blade rubber portion, so that the first seal can follow the scraping of the blade rubber portion. Since it can be gradually crushed, it is possible to suppress the formation of a step between the side edge seal and the blade rubber part, and to suppress toner leakage. Further, since the fibers are arranged on the first seal, the toner on the side edge seal can be returned to the inner side in the axial direction, that is, the blade rubber portion side.

  According to the present invention, it is possible to move the toner on the side edge seal toward the blade rubber portion side while suppressing a step between the side edge seal and the blade rubber portion.

It is sectional drawing which shows the developing device which concerns on one Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows a developing device. It is a perspective view which decomposes | disassembles and shows a side edge seal. It is the top view (a) which shows a 2nd seal | sticker, and II sectional drawing (b) of FIG.2 (b). It is the front view which looked at the state which assembled | attached the layer thickness control blade and the side edge seal to the housing | casing from the opening side. It is a figure which shows the modification of a side edge seal.

A developing device according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the developing device 28 is used in an image forming apparatus such as a printer. The developing device 28 includes a rotatable developing roller 31, a layer thickness regulating blade 100, a rotatable supply roller 33, a toner storage chamber 34, and a rotatable agitator 34A.

  In the developing device 28, the toner stored in the toner storage chamber 34 is stirred by the agitator 34 </ b> A and then supplied to the developing roller 31 by the supply roller 33. At this time, the toner is positively frictionally charged between the supply roller 33 and the developing roller 31. The toner supplied onto the developing roller 31 enters between the layer thickness regulating blade 100 and the developing roller 31 as the developing roller 31 rotates. As a result, the toner is further frictionally charged between the layer thickness regulating blade 100 and the developing roller 31. Further, the toner on the developing roller 31 is regulated to a thin layer having a certain thickness by the layer thickness regulating blade 100.

  The toner in this embodiment is a positively charged non-magnetic one-component toner, and a styrene-acrylic resin formed into a spherical shape by suspension polymerization, and a charge control of a well-known colorant such as carbon black and a quaternary ammonium salt. Has been added sex. The toner base particles have an average particle diameter of 4 μm to 10 μm, and silica is added to the surface as an external additive. The toner is not limited to the type of toner described above, and for example, a negatively chargeable toner may be used.

Next, the detailed structure of the developing device 28 will be described.
Since the developing device 28 has a substantially symmetrical structure in the axial direction of the developing roller 31, in the drawings to be referred to hereinafter, only a portion on one end side in the axial direction of the developing roller 31 is shown, and a portion on the other end side is shown. It will be omitted.

  As shown in FIG. 2, the developing device 28 includes the developing roller 31 and the like described above, a housing 50 for storing toner, a side seal 200 that contacts an end portion in the axial direction of the developing roller 31, A blade back seal 36 disposed between the layer thickness regulating blade 100 and the housing 50 and a side edge seal 140 are provided. In the present embodiment, the developing roller 31 has the direction of the arrow shown in FIG. 2, that is, the peripheral surface of the developing roller 31 faces the surface of the side seal 200 from the side far from the layer thickness regulating blade 100 to the near side. It is provided to rotate in the rubbing direction. In the following description, the rotation direction of the developing roller 31 is also simply referred to as “rotation direction”.

  The developing roller 31 has a cylindrical roller portion 31A and a shaft portion 31B that supports the roller portion 31A. The roller portion 31A has elasticity. The roller portion 31A carries toner on its peripheral surface. The shaft portion 31B passes through the roller portion 31A. The shaft portion 31B protrudes outward in the axial direction of the developing roller 31 from the roller portion 31A.

  The housing 50 has a bearing portion 51 that rotatably supports the shaft portion 31 </ b> B of the developing roller 31, an opening 52 for supplying toner from the toner storage chamber 34 to the developing roller 31, and a side seal 200. Side seal attaching surface 53.

  The opening 52 is a rectangular hole that is long in the axial direction. A blade back seal 36 and a layer thickness regulating blade 100 are disposed on one end side in the short direction of the opening 52, specifically on the upper side in the drawing. A supply roller 33 is disposed in the opening 52. The supply roller 33 is disposed close to the other end side in the short direction of the opening 52, specifically, to the lower side in the drawing.

  In the following description, since the short direction of the opening 52 corresponds to the vertical direction of the drawing, the short direction is also referred to as “vertical direction”. One end side in the short direction is also referred to as “upper side”, and the other end side in the short direction is also referred to as “lower side”. Further, since the axial direction of the developing roller 31 corresponds to the left-right direction in the drawing, the axial direction is also referred to as “left-right direction”. One end side in the axial direction is also referred to as “left side”, and the other end side in the axial direction is also referred to as “right side”. Further, an orthogonal direction orthogonal to the short direction and the axial direction is also referred to as “front-rear direction”. One end side in the front-rear direction, specifically, the side on which the developing roller 31 is disposed with respect to the opening 52 is “front side”, and the other end side in the front-rear direction, specifically, the side on which the agitator 34A is disposed with respect to the opening 52. Also called “rear side”.

  The blade back seal 36 is made of an elastic member such as sponge. The blade back seal 36 is a long member that is long in the left-right direction. The blade back seal 36 is larger than the opening 52 in the left-right direction. The blade back seal 36 is fixed to the housing 50 (specifically, the upper part of the opening 52) by the double-sided tape TP1.

  The side seal 200 is a seal that comes into contact with the end surface of the developing roller 31 in the left-right direction, specifically, the peripheral surface of the end portion of the roller portion 31A in the left-right direction. The side seal 200 is disposed between the side seal attaching surface 53 and the roller portion 31A.

  The side seal 200 has a surface layer 210 and a base layer 220. The surface layer 210 is a layer in contact with the peripheral surface of the roller portion 31A of the developing roller 31. The surface layer 210 is made of a nonwoven fabric or the like. The base layer 220 is made of an elastic body such as urethane sponge. The base layer 220 is disposed between the surface layer 210 and the housing 50.

  The layer thickness regulating blade 100 includes a blade body 110 that extends in the left-right direction, a rubber blade rubber portion 120 that is fixed to a lower end portion (tip portion) of the blade body 110, and an upper end portion of the blade body 110. And a blade holder 130 for supporting the blade.

  The blade body 110 is a substantially rectangular sheet metal that is long in the left-right direction. An upper end portion of the blade body 110 is fixed to the housing 50 via a blade holder 130. The lower end of the blade body 110 is a free end. The blade body 110 supports the blade rubber portion 120 at the free end.

  The blade rubber portion 120 is a rubber member that extends in the left-right direction and is smaller in size in the left-right direction than the blade body 110. The blade rubber portion 120 is made of, for example, silicon rubber or urethane rubber. The blade rubber portion 120 is provided at the lower end of the blade body 110. The blade rubber portion 120 protrudes from the surface of the blade body 110 facing the developing roller 31 and contacts the circumferential surface of the roller portion 31A of the developing roller 31. The blade rubber portion 120 has a flat surface 120A in contact with the developing roller 31, and corners on the upstream side and the downstream side in the rotational direction are arcuate in sectional view (see FIG. 1).

  The blade rubber portion 120 has a notch 121 at each end in the left-right direction. The notch 121 has a shape recessed from the end on the upstream side in the rotational direction of the blade rubber portion 120 and recessed from the end surface 122 in the left-right direction of the blade rubber portion 120.

  The notch 121 has a first surface 123 that extends inward in the left-right direction from the lower edge of the end surface 122 and a second surface 124 that extends downward from the first surface 123. The first surface 123 is along the left-right direction.

  By providing such a notch 121 in the blade rubber part 120, the corner between the surface 120A of the blade rubber part 120 that contacts the developing roller 31 and the first surface 123 is substantially perpendicular. Further, the corner between the surface 120A of the blade rubber portion 120 that contacts the developing roller 31 and the second surface 124 is also substantially perpendicular. In other words, the blade rubber portion 120 has an edge portion 123A (a tip portion of a corner pointed at a substantially right angle) in contact with the peripheral surface of the roller portion 31A of the developing roller 31 at each end in the left-right direction. . The edge portion 123A is formed to extend in the left-right direction. The edge portion 123 </ b> A is connected to the end surface 122 and the second surface 124. The sharp edge portion 123A makes it easier to scrape the toner on the developing roller 31 than the portion of the blade rubber portion 120 that is shifted inward in the left-right direction from the edge portion 123A.

  The blade body 110 is formed such that the lower edge corresponds to the blade rubber portion 120. Further, each end in the left-right direction of the blade body 110 extends to the outside in the left-right direction with respect to the blade rubber portion 120. A rectangular side edge seal 140 is provided at each end of the blade body 110 in the left-right direction.

  As shown in FIG. 3, the side edge seal 140 is affixed to the surface on the front side of the blade body 110 (the surface facing the developing roller 31). The side edge seal 140 is adjacent to the blade rubber portion 120 in the left-right direction. Specifically, the side edge seal 140 is in contact with the left and right end surface 122 of the blade rubber portion 120. The side edge seal 140 extends downward from a position adjacent to the end surface 122. The side edge seal 140 extends below the blade body 110. The lower end of the side edge seal 140 is in contact with the side seal 200.

  The side edge seal 140 is in contact with the first seal 150 that contacts the peripheral surface of the roller portion 31A of the developing roller 31, and the first seal 150 that is adjacent to the first seal 150 and that contacts the peripheral surface of the roller portion 31A of the developing roller 31. 2 seal 160.

  The first seal 150 is disposed so as to come into contact with the end surface 122 in the left-right direction of the blade rubber portion 120. As shown in FIG. 3, the first seal 150 is made of sponge. The 1st seal | sticker 150 is formed in the rectangular parallelepiped shape long in a rotation direction. The first seal 150 can be crushed thinner than the second seal 160. Here, “can be crushed thinly” means that the thickness of the first seal 150 when the first seal 150 is crushed to the maximum is the second seal 160 when the second seal 160 is crushed to the maximum. It means that it becomes smaller than the thickness of.

  As shown in FIG. 4B, in a state before the developing roller 31 is assembled to the housing 50 (a state in which the seals 150 and 160 are not crushed), the first seal 150 is a base sheet of the second seal 160 described later. It is thicker than 162. Further, in a state before the developing roller 31 is assembled to the housing 50, the heights H1 and H2 of the first seal 150 and the second seal 160 from the blade body 110 are the heights of the blade rubber portion 120 from the blade body 110. It is higher than H3. Here, the height of each seal 150, 160 from the blade body 110 is the height including the thickness of the double-sided tape TP2 described later, that is, the blade from the opposite surface of the seal 150, 160 to the blade body 110. The distance (H1, H2) to the main body 110 is said. The height of the blade rubber part 120 from the blade body 110 refers to the distance (H3) from the surface 120A of the blade rubber part 120 that contacts the developing roller 31 to the blade body 110.

  Note that the thickness of the base sheet 162 may be set in consideration of the fact that the blade rubber portion 120 is shaved and the height is lowered due to long-term use of the developing device 28. Specifically, the thickness of the base sheet 162 is set so that the height of the base sheet 162 from the blade body 110 is smaller than the height of the blade rubber part 120 after use of the developing device 28. That's fine.

  As shown in FIG. 2, the upper edge of the first seal 150 is located above the upper edge of the left and right end surface 122 of the blade rubber portion 120. In other words, in the rotation direction, the downstream end of the first seal 150 is located downstream of the downstream end of the end surface 122 of the blade rubber portion 120. A protruding piece 125 that protrudes upward is provided at each end in the left-right direction of the blade rubber portion 120, but the protruding piece 125 is separated from the first seal 150 in the left-right direction. That is, the protruding piece 125 does not constitute the end surface 122 of the blade rubber portion 120.

  As shown in FIG. 3, the second seal 160 includes a fiber layer 161 composed of a plurality of fibers FB (see FIG. 2) that contacts the roller portion 31 </ b> A of the developing roller 31, and a base sheet in which the fibers FB are implanted. 162. In detail, the 2nd seal | sticker 160 is a pile fabric, and it forms so that the fiber FB (cut pile) may protrude from the base sheet 162 as a foundation | substrate by cutting a loop-shaped pile. Each fiber FB is made of a fluorine fiber. As shown to Fig.4 (a), the some fiber FB is inclined with respect to the rotation direction so that it may be located inside the left-right direction as it goes to the rotation direction downstream side. That is, the plurality of fibers FB are inclined so that the toner on the second seal 160 moves inward in the left-right direction. Specifically, as shown in FIG. 5, the angle β of the fiber FB with respect to the left and right direction is the angle on the outer side in the left and right direction of the base sheet 162 and the upstream side in the rotation direction, and the upstream side in the rotation direction of the end surface 122 of the blade rubber portion 120. The angle α is smaller than the angle α with respect to the left-right direction of the straight line SL connecting the end edges.

  As shown in FIG. 4B, some of the plurality of fibers FB, specifically, the fiber FB located on the innermost side in the left-right direction, protrudes from the end edge of the base sheet 162 and the first seal 150. Overlapping. The tip of the fiber FB located on the innermost side in the left-right direction is located on the inner side in the left-right direction with respect to the first seal 150.

  As shown in FIG. 3, the base sheet 162 is formed in a rectangular sheet shape that is long in the rotation direction. The base sheet 162 is made of cloth or the like. The length of the base sheet 162 in the rotational direction is substantially the same as the length of the first seal 150. Further, the width of the base sheet 162 in the left-right direction is larger than the width of the first seal 150 in the left-right direction. The base sheet 162 is disposed so as to contact the end surface 151 on the outer side in the left-right direction of the first seal 150. That is, in the present embodiment, the entire base sheet 162 is a first portion that contacts the end surface 151 on the outer side in the left-right direction of the first seal 150.

  As shown in FIGS. 3 and 4 (b), the first seal 150 and the second seal 160 are adjacent to each other, with the blade body 110 and the side seal 200 (see FIG. 2) interposed between the double-sided tape TP2. ).

Next, a method for manufacturing the developing device 28 will be described.
As shown in FIG. 2, first, the supply roller 33, the side seal 200, and the blade back seal 36 are attached to the housing 50. Next, the layer thickness regulating blade 100 is attached to the housing 50.

  Thereafter, the side edge seal 140 is attached on the blade body 110 and the side seal 200 of the layer thickness regulating blade 100. Specifically, as shown in FIG. 3, the first seal 150 and the second seal 160 integrated with the double-sided tape TP <b> 2 are attached on the blade body 110 and the side seal 200. Then, the developing device 28 is manufactured by appropriately assembling other components to the housing 50.

The operational effects of the developing device 28 configured as described above will be described.
When a driving force is input to the developing device 28, the developing roller 31 rotates while contacting the side seal 200, the blade rubber portion 120, and the side edge seal 140.

  At this time, as shown in FIG. 5, since the fibers FB of the second seal 160 are inclined with respect to the rotation direction, the toner that has entered the outside in the left-right direction of the second seal 160 enters the inclined fibers FB. And move inward in the left-right direction. Specifically, since the fibers FB are arranged on the first seal 150, the toner moves further inward in the left-right direction after moving from the second seal 160 to the first seal 150, and the first seal 150 is moved to the first seal 150. The seal 150 moves to the inner end in the left-right direction. Then, the toner that has moved to the end on the inner side in the left-right direction of the first seal 150 is returned into the housing 50 through the opening 52 on the inner side in the left-right direction of the first seal 150.

  When the developing device 28 is used for a long period of time, the blade rubber portion 120 is gradually scraped, and the height of the blade rubber portion 120 from the blade body 110 gradually decreases. On the other hand, the first seal 150 that contacts the end face 122 of the blade rubber portion 120 can be crushed thinner than the second seal 160. As a result, the first seal 150 can be gradually crushed so as to follow the scraping of the blade rubber portion 120, and therefore, it is possible to suppress the formation of a step between the side edge seal 140 and the blade rubber portion 120. , Toner leakage can be suppressed.

As described above, according to the present embodiment, the following effects can be obtained in addition to the effects described above.
Since the tip of the fiber FB located on the innermost side in the left-right direction is located on the inner side in the left-right direction with respect to the first seal 150, the substantially entire first seal 150 can be covered with the fiber FB. The toner can be returned to the inside in the left-right direction more favorably.

  Since the width in the left-right direction of the base sheet 162 is larger than the width in the left-right direction of the first seal 150, the region of the first seal 150 that is not covered with the fibers FB (the corner on the upstream side in the rotation direction and on the inner side in the left-right direction) ) Can be reduced. Thereby, the toner can be returned to the inner side in the left-right direction more favorably on the first seal 150.

  Since the first seal 150 is thicker than the base sheet 162, it is possible to prevent the base sheet 162 from obstructing the height follow-up of the first seal 150 with respect to the height change caused by the cutting of the blade rubber portion 120.

  Since the downstream end of the first seal 150 in the rotational direction is positioned downstream of the downstream end of the end surface 122 of the blade rubber portion 120 in the rotational direction, toner leakage from between the side edge seal 140 and the blade rubber portion 120 is prevented. It can be suppressed more.

  Since the edge portion 123A of the blade rubber portion 120 is connected to the end surface 122, the first seal 150 adjacent to the end surface 122 is also adjacent to the edge portion 123A, so that toner leakage around the edge portion 123A can be suppressed. .

  The angle β with respect to the left and right direction of the fiber FB is the angle with respect to the left and right direction of the straight line SL that connects the corner on the outer side in the left and right direction of the base sheet 162 and the upstream side of the rotation direction of the end surface 122 of the blade rubber portion 120. Since it is smaller than α, the toner can be returned to the opening 52 side by each fiber FB.

  In addition, this invention is not limited to the said embodiment, It can utilize with various forms so that it may illustrate below. In the following description, the same reference numerals are given to members having substantially the same structure as in the above embodiment, and the description thereof is omitted.

  In the above embodiment, the base sheet 162 is formed in a rectangular sheet shape, but the present invention is not limited to this. For example, as shown in FIG. 6, the base sheet 162 may be formed in an L shape in plan view. Good. Specifically, in this embodiment, the base sheet 162 includes a first portion 162A that contacts the end surface 151 on the outer side in the left-right direction of the first seal 150, and a second portion that contacts the end surface 152 on the upstream side in the rotational direction of the first seal 150. 162B and a third portion 162C that connects the first portion 162A and the second portion 162B.

  The third portion 162C is disposed upstream of the first portion 162A in the rotation direction. The third portion 162C is disposed on the outer side in the left-right direction of the second portion 162B.

  In this embodiment, among the plurality of fibers FB implanted in the first portion 162A, the fiber FB located on the innermost side in the left-right direction is on the inner side in the left-right direction than the inner edge in the left-right direction of the first portion 162A. And overlaps the first seal 150.

  Further, among the plurality of fibers FB implanted in the second portion 162B, the fiber FB located on the innermost side in the left-right direction protrudes inward in the left-right direction with respect to the edge on the inner side in the left-right direction of the second portion 162B. . Further, the fiber FB located on the most downstream side in the rotation direction of the second portion 162B protrudes more downstream than the end edge on the downstream side in the rotation direction of the second portion 162B and overlaps the first seal 150.

  As described above, according to this embodiment, the toner to be moved toward the first seal 150 by the rotation of the developing roller 31 can be moved inward in the left-right direction by the fibers FB of the second portion 162B. To the opening 52 side.

  In the said embodiment, although the 1st seal | sticker 150 was comprised with sponge, this invention is not limited to this, For example, a nonwoven fabric may be sufficient. According to this, friction between the developing roller and the first seal can be reduced.

  In the above-described embodiment, the angle β with respect to the left-right direction of the fiber FB is set smaller than the angle α with respect to the left-right direction of the straight line SL. However, the present invention is not limited to this. Alternatively, the angle may be the same as the angle α.

  In the said embodiment, although the fiber FB was made into the fluorine fiber, this invention is not limited to this, Other fibers, such as animal hair, may be sufficient.

  In the above-described embodiment, the present invention is applied to the developing device 28 including the developing roller 31 and the toner storage chamber 34, but the present invention is not limited to this. For example, the present invention can be applied to other developing devices such as a developing cartridge in which a developing cartridge and a drum unit are integrally configured, and a developing cartridge that is configured separately from a toner cartridge that stores toner and that is supplied with toner from the toner cartridge. May be applied.

  In addition, you may implement combining each element demonstrated by above-described embodiment and modification arbitrarily.

28 Developing Device 31 Developing Roller 100 Layer Thickness Restricting Blade 110 Blade Main Body 120 Blade Rubber Part 140 Side Edge Seal 150 First Seal 160 Second Seal 161 Fiber Layer 162 Base Sheet FB Fiber

Claims (12)

A rotatable developing roller;
A layer thickness regulating blade having a blade rubber part in contact with the peripheral surface of the developing roller and a blade body supporting the blade rubber part;
A side edge seal provided on the blade body and adjacent to the blade rubber portion in the axial direction of the developing roller;
The side edge seal is
A first seal that contacts the peripheral surface of the developing roller, the first seal disposed so as to contact the end surface of the blade rubber portion in the axial direction;
A second seal adjacent to the first seal and in contact with the peripheral surface of the developing roller;
The first seal can be crushed thinner than the second seal,
The second seal has a fiber layer composed of a plurality of fibers in contact with the developing roller, and a base sheet in which each fiber is implanted,
The plurality of fibers are inclined so that the toner on the second seal moves toward the inner side in the axial direction,
Part of the plurality of fibers protrudes from an edge of the base sheet and overlaps the first seal.   The developing device according to claim 1, wherein the base sheet has a first portion that contacts an end face of the first seal in the axial direction outer side.   The said base sheet | seat has the 2nd part which contacts the end surface of the said rotation direction upstream of the said 1st seal | sticker, and the 3rd part which connects the said 1st part and the said 2nd part. 2. The developing device according to 2.   4. The developing device according to claim 2, wherein a tip end of a fiber protruding from an end edge of the base sheet is located on an inner side in the axial direction than the first seal. 5.   The developing device according to claim 4, wherein a width of the base sheet in the axial direction is larger than a width of the first seal in the axial direction.   The developing device according to claim 1, wherein the first seal is thicker than the base sheet.   The downstream end of the first seal is located on the downstream side of the downstream end of the end surface of the blade rubber portion in the rotation direction. Development device.   The developing device according to claim 1, wherein the first seal is a non-woven fabric.   The developing device according to claim 1, wherein the first seal is a sponge.   10. The blade rubber portion according to claim 1, wherein the blade rubber portion includes an edge portion that extends in the axial direction and is connected to the end surface and contacts a peripheral surface of the developing roller. Development device.   The angle of the fiber with respect to the axial direction is a straight line connecting the corner on the outer side in the axial direction of the base sheet and the upstream side in the rotational direction and the edge on the upstream side in the rotational direction of the end surface of the blade rubber portion. The developing device according to claim 1, wherein the developing device is smaller than an angle with respect to the direction.   The developing device according to claim 1, wherein the fibers are fluorine fibers.

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