JP2010091958A - Developing device - Google Patents

Abstract

An object of the present invention is to provide a developing device capable of suppressing toner leakage.
A developing device (developing cartridge) includes a developer housing having a supply port for supplying a developer to a developer carrying member, and a layer for regulating the thickness of the developer on the developer carrying member. A thickness regulating blade 32, a side seal member 60 that is provided between both end portions of the developer carrier and the developing device casing 50 and is slidable in contact with the developer carrier, and along the axial direction of the developer carrier. And a sheet-like long seal member (lower film 63) that extends in sliding contact with the developer carrying member and that overlaps the side seal member 60 at both ends. The side seal member 60 is configured to send the developer in an oblique direction toward the supply port 52 toward the downstream side in the rotation direction of the developer carrier. It forms along the diagonal direction which goes to the supply port 52 as it goes to the rotation direction downstream of a body.
[Selection] Figure 4

Description

  The present invention relates to a developing device including a side seal member that seals between both end portions of a developing roller and a developing device housing.

  In general, a rotatable developing roller for carrying toner, a developing device housing having a supply port for supplying toner to the developing roller, both ends of the developing roller, and a developing device housing (site adjacent to the supplying port) 2. Description of the Related Art There is known a developing device that includes a side seal member that is provided in between and is slidable in contact with a developing roller. Conventionally, as a side seal member of such a developing device, an upstream base material, a downstream base material provided downstream of the upstream base material (downstream in the rotation direction of the developing roller), and an upper surface thereof are bonded. In this case, a felt member that is in sliding contact with the developing roller is known (see Patent Document 1).

JP 2001-22179 A

  However, in the technique described above, when the toner enters the surface of the felt member, the direction of the fiber of the felt is not constant, so the toner moves in a direction away from the supply port along with the sliding contact with the developing roller, There was a risk of toner leakage.

  SUMMARY An advantage of some aspects of the invention is that it provides a developing device capable of suppressing toner (developer) leakage.

  In order to solve the above problems, a developing device according to the present invention supports a developer carrying member carrying a developer, the developer carrying member rotatably, and supplying the developer to the developer carrying member. A developer housing having a supply port, and a layer thickness regulating blade that is provided in the developer housing and regulates the thickness of the developer on the developer carrier in sliding contact with the developer carrier; A side seal member provided between both end portions of the developer carrier and a portion adjacent to the supply port in the developer housing; and a slidable contact with the developer carrier; and the developer carrier A sheet-like long seal member that extends along the axial direction, is in sliding contact with the developer carrier, and overlaps the side seal member at both ends, the side seal member comprising the developer carrier The supply as it goes downstream in the rotation direction The both ends of the long seal member are formed along an oblique direction toward the supply port as it goes downstream in the rotation direction of the developer carrier. It is characterized by.

  According to the present invention, when the developer enters the surface of the side seal member, the developer on the side seal member moves toward the downstream side in the rotation direction along with the rotation of the developer carrier. The developer is returned to the supply port by moving in an oblique direction toward, so that leakage of the developer is suppressed. Furthermore, both end edges of the long seal member that overlaps with the side seal member are formed along an oblique direction toward the supply port as it goes downstream in the rotation direction of the developer carrier, so that the side seal member feeds it obliquely. The developer to be collected does not easily accumulate at both end edges of the long seal member and moves along both end edges. For this reason, it is possible to suppress the leakage of the developer and the damage of the developer carrier due to the developer being accumulated at both end edges of the long seal member.

  According to the present invention, even when the developer enters the surface of the side seal member, the developer can be returned to the supply port by the side seal member that sends the developer obliquely. Can be suppressed. Further, since it is difficult for the developer to collect at both ends of the long seal member, it is possible to suppress the leakage of the developer and the damage to the developer carrier due to the developer collecting at both ends of the long seal member.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is a side sectional view showing a laser printer provided with a developing cartridge according to an embodiment of the present invention, and FIG. 2 is a side sectional view showing the developing cartridge. In the following description, first, the overall configuration of the laser printer will be briefly described, and then the details of the characteristic portions of the present invention will be described.

  Further, in the following description, the description will be made in the direction based on the user when the laser printer 1 is used. That is, in FIG. 1, the right side is referred to as “front side (front side)”, the left side is referred to as “back side (rear side)”, and the back side of the paper vertical direction is referred to as “right side”. The near side is referred to as the “left side”. As for the up and down direction, the illustrated direction and the direction when used by the user coincide with each other, and are therefore referred to as “up and down direction” as they are.

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

<Configuration of feeder section>
The feeder unit 4 includes a paper feed tray 6 that is detachably attached to the bottom of the main casing 2 and a paper pressing plate 7 provided in the paper feed tray 6. The feeder unit 4 includes various rollers 11 that carry the paper 3 and remove paper dust. In the feeder unit 4, the sheet 3 in the sheet feeding tray 6 is moved upward by the sheet pressing plate 7 and conveyed to the image forming unit 5 by various rollers 11.

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

<Configuration of scanner unit>
The scanner unit 16 is provided at an upper portion in the main body casing 2 and includes a laser light emitting unit (not shown), a polygon mirror 19 that is rotationally driven, lenses 20, 21 and reflecting mirrors 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 a path indicated by a chain line in the drawing.

<Configuration of process cartridge>
The process cartridge 17 is configured to be detachably attached to the main casing 2 by appropriately opening a front cover 2 a provided on the front side of the main casing 2. The process cartridge 17 is mainly composed of a developing cartridge 28 as an example of a developing device and a drum unit 39.

  The developing cartridge 28 is detachably attached to the main body casing 2 while being attached to the drum unit 39. The developing cartridge 28 may be configured to be detachable from the drum unit 39 fixed to the main casing 2. As shown in FIG. 2, the developing cartridge 28 mainly includes a developing roller 31 as an example of a developer carrier, a layer thickness regulating blade 32, a supply roller 33, and a toner storage chamber 34.

  In the developing cartridge 28, toner as an example of the developer in the toner storage chamber 34 is stirred by the agitator 34A and then supplied to the developing roller 31 by the supply roller 33. At this time, the supply roller 33 and the developing roller 31 are supplied. And positively triboelectrically charged. The toner supplied onto the developing roller 31 enters between the layer thickness regulating blade 32 and the developing roller 31 as the developing roller 31 rotates, and is further developed as a thin layer having a constant thickness while being frictionally charged. It is carried on a roller 31. Details of the developing cartridge 28 will be described later.

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

  Next, by the rotation of the developing roller 31, the toner carried on the developing roller 31 is supplied to the electrostatic latent image formed on the surface of the photosensitive drum 27, so that the toner image is formed on the surface of the photosensitive drum 27. It is formed. Thereafter, the sheet 3 is conveyed between the photosensitive drum 27 and the transfer roller 30, whereby the toner image carried on the surface of the photosensitive drum 27 is transferred onto the sheet 3.

<Configuration of fixing unit>
As shown in FIG. 1, the fixing unit 18 includes a heating roller 41 and a pressure roller 42 that is disposed to face the heating roller 41 and pressurizes the heating roller 41. In the fixing unit 18 configured as described above, the toner transferred onto the paper 3 is thermally fixed while the paper 3 passes between the heating roller 41 and the pressure roller 42. The sheet 3 thermally fixed by the fixing unit 18 is conveyed to a paper discharge roller 45 disposed on the downstream side of the fixing unit 18, and is sent out from the paper discharge roller 45 onto a paper discharge tray 46.

<Detailed structure of developing cartridge>
Next, the detailed structure of the developing cartridge 28 according to an embodiment of the present invention will be described. 3 is an enlarged perspective view (a) showing a structure around the side seal member, a sectional view (b) showing details of the side seal member, and an enlarged perspective view of the portion X in FIG. 3 (a). FIG. 4 (c) is an enlarged perspective view (d) of the Y portion in FIG. 3 (a), and FIG. 4 shows the direction in which the toner is fed by the upstream side seal and the downstream side seal and the angle of both end edges of the lower film. It is a front view. Since the developing cartridge 28 has a bilaterally symmetric structure, only the left portion is shown in FIGS. 3 and 4, and the right portion is omitted. 3 and 4 show a state in which the developing roller 31 and the supply roller 33 are removed.

  As shown in FIG. 3A, the developing cartridge 28 includes the developing roller 31 and the like described above, and is in sliding contact with a developing device housing 50 that rotatably supports the developing roller 31 and both ends of the developing roller 31. A side seal member 60 and a lower film 63 as an example of a long seal member are provided.

  The developing device housing 50 includes a bearing portion 51 that rotatably supports the developing roller 31, a supply port 52 for supplying toner from the internal toner storage chamber 34 to the developing roller 31, and left and right sides of the supply port 52. It mainly has a mounting surface 53 that is formed in a circular arc when viewed from the side. The supply port 52 is formed in a rectangular long hole shape along the axial direction of the developing roller 31. A support portion 54 for supporting the lower film 63 is formed below the supply port 52 so as to protrude toward the developing roller 31 from the mounting surface 53, and a layer thickness restriction is formed above the supply port 52. The blade 32 is fixed.

  The layer thickness regulating blade 32 includes a metal plate 32A whose upper end is fixed to the developing device casing 50, and a rubber pressing member 32B as an example of a pressing portion fixed to the lower end edge (tip edge) of the metal plate 32A. And is mainly configured. The metal plate 32 </ b> A is formed with a length that protrudes outward in the left-right direction from the left and right edges of the supply port 52, and upper corners at both ends thereof are fixed to the developing device housing 50 by screws S. Yes. The pressing member 32B protrudes outward in the left-right direction from the left and right end edges of the supply port 52, and is formed with such a length that both end edges are positioned inward in the left-right direction than the left and right end edges of the metal plate 32A. (See FIG. 4). The pressing member 32B is in sliding contact with the outer peripheral surface of the developing roller 31 while receiving a biasing force from the metal plate 32A.

  The side seal member 60 is provided between both end portions of the developing roller 31 and the mounting surfaces 53 adjacent to the left and right sides of the supply port 52 in the developing device casing 50. The side seal member 60 mainly includes the upstream seal 61 and the downstream side. And a seal 62.

  As shown in FIG. 3B, the upstream side seal 61 includes a base material 61A having elasticity and a surface member 61B provided on the surface of the base material 61A on the developing roller 31 side. The base 61A is formed of an elastic body such as urethane sponge, and is directly attached to the attachment surface 53 of the developing device housing 50 by the double-sided tape T.

  As shown in FIG. 3C, the surface member 61 </ b> B is configured by planting a plurality of hairs C on the base sheet BS, and is attached to the base material 61 </ b> A with a double-sided tape T. Specifically, the surface member 61B is configured by arranging a plurality of hair bundles CB formed by bundling a plurality of hairs C at a predetermined interval, and each hair bundle CB is a rotation direction of the developing roller 31 ( It is configured in a state where it is tilted in an oblique direction toward the supply port 52 as it goes downstream of the arrow (indicated by a thick line in the figure). More specifically, a plurality of rows each having a plurality of hair bundles CB arranged at intervals along the oblique direction described above are provided, and each row is arranged so as to be spaced from each other. As a result, the first guide passage G1 for feeding the toner in the above-described oblique direction is formed between the hair bundles CB in the surface member 61B. As shown in FIG. 4, the upstream seal 61 configured in this way has a width larger than the left and right width of the downstream seal 62 so as to extend to the supply port 52 side than the downstream seal 62. Is formed.

  The surface member 61B has a plurality of hair bundles CB planted on one sheet material, and then creases each hair bundle CB in a predetermined direction for a predetermined time, after which the sheet material is attached to a plurality of base materials. It is formed by cutting the sheet BS vertically and horizontally. Therefore, compared to a method in which the above-described sheet material is cut into a plurality of base sheets BS and then the hair bundles CB are wrinkled, the hair tips can be formed so as not to protrude from the base sheet BS. If the hair ends do not protrude from the base sheet BS in this way, the toner on the developing roller 31 is not scraped off by the hair tips protruding from the base sheet BS into the supply port 52. The toner can be favorably carried in the image forming range.

  In FIGS. 3 and 4, for convenience of explanation, the length of the hair C implanted and the interval between the hair bundles CB are shown greatly. Therefore, for example, the length of the hair C may be shorter than that in the figure, and the hair bundles CB may be arranged with a close interval on the entire surface.

  The downstream seal 62 is provided on the downstream side in the rotation direction of the developing roller 31 with respect to the upstream seal 61. As shown in FIG. 3B, the base 62A having elasticity and the base 62A And a surface member 62B provided on the surface on the developing roller 31 side. The base material 62A is formed of an elastic body such as urethane sponge, and is affixed to the metal plate 32A with a double-sided tape T so as to protrude to the upstream side of the metal plate 32A of the layer thickness regulating blade 32.

  As shown in FIG. 3D, the surface member 62B includes a plurality of hair bundles CB and a base sheet BS similar to the surface member 61B of the upstream seal 61, and each hair bundle CB is located upstream. The seal 61 is configured to be tilted in a different direction from the surface member 61B. That is, the surface member 62B has a plurality of rows composed of a plurality of hair bundles CB arranged at intervals along the rotation direction of the developing roller 31 with a space in the axial direction of the developing roller 31. The hair bundle CB is configured to be tilted downstream along the rotation direction of the developing roller 31. As a result, the second guide passage G2 for sending the toner to the downstream side along the rotation direction is formed between the hair bundles CB in the surface member 62B.

  Further, as shown in FIG. 3B, the surface member 62B is formed longer in the rotational direction than the base member 62A so as to extend to the upstream side of the base member 62A in the rotational direction. A portion of the surface member 62B that protrudes upstream in the rotation direction from the base material 62A is disposed between the base material 61A of the upstream seal 61 and the surface member 61B. Thus, the surface member 61B of the upstream seal 61 is overlaid on the surface member 62B of the downstream seal 62.

  The downstream seal 62 (the base material 62A and the surface member 62B) configured as described above is a layer so as to be in close contact with the left and right end edges BE of the pressing member 32B of the layer thickness regulating blade 32 as shown in FIG. It is disposed on the thickness regulating blade 32. As shown in FIG. 3B, a seal material SM different from the side seal member 60 is provided between the layer thickness regulating blade 32 (metal plate 32A) and the mounting surface 53 of the developing device housing 50. Is provided.

  The side seal member 60 configured as described above is attached in a state of being hung by the layer thickness regulating blade 32 (metal plate 32A) before the layer thickness regulating blade 32 is attached to the developing device housing 50. . Therefore, the layer thickness regulating blade 32 is fixed to the developing device casing 50 with the screw S, and the base thickness 61A of the upstream side seal 61 is simply attached to the mounting surface 53 of the developing device casing 50. The side seal member 60 can be easily attached to the developing device housing 50.

  As shown in FIG. 3A, the lower film 63 is a sheet-like member made of a resin such as polyethylene terephthalate, and extends along the axial direction of the developing roller 31 so as to be in sliding contact with substantially the entire developing roller 31. Yes. The lower film 63 is formed to be longer in the left-right direction than the support portion 54. When the lower film 63 is affixed to the support portion 54, both end portions thereof protrude from the support portion 54 and the upstream seal 61 (side seal member) 60).

  Then, each edge 63A (hereinafter also referred to as “both edges 63A”) of both ends of the lower film 63 that overlaps with the upstream seal 61 is located downstream in the rotation direction of the developing roller 31, as shown in FIG. It forms along the diagonal direction which goes to the supply port 52 as it goes. More specifically, the angle β of the both end edges 63A of the lower film 63 with respect to the arrow RD (rotation direction of the developing roller 31) in the figure is the angle α (hair bundle CB) of the toner feeding direction by the upstream side seal 61 with respect to the arrow RD. The angle). Thus, the toner moving on the upstream side seal 61 is returned to the supply port 52 without accumulating at both end edges 63A of the lower film 63. In FIG. 4, the shape of the lower film 63 and the orientation of the hair bundle CB are simply illustrated so that the comparison between the angle β of the both end edges 63A of the lower film 63 and the angle α of the hair bundle CB is easy to understand. ing.

  Further, as shown in FIG. 3A, a concave developer receiving portion 70 that opens only upward is formed on the rear side of the upstream seal 61 (upstream in the rotation direction of the developing roller 31). Specifically, the developer receiving portion 70 includes a mounting surface 53, a support portion 54, an outer wall portion 73 located on the outer side in the left-right direction of the mounting surface 53, an upstream side seal 61, and the rear of the developing device housing 50. It is comprised by the flexible sheet | seat member 75 stuck along an edge part. As a result, even if the toner on the downstream seal 62 is captured by the developing roller 31 and conveyed toward the upstream seal 61, the toner is scraped and dropped at the edge of the upstream seal 61. Since the toner can be received by the developer receiving portion 70, toner leakage from the developing cartridge 28 can be suppressed.

Next, the operation of the side seal member 60 according to this embodiment will be described.
As shown in FIG. 3A, when the developing roller 31 is rotating, if the toner enters the upstream seal 61, the toner on the upstream seal 61 is as shown in FIG. It moves along the first guide path G1 (or between the plurality of hairs C constituting the hair bundle CB) between the hair bundles CB pushed obliquely by the rotating developing roller 31. At this time, the toner smoothly moves toward the supply port 52 without being obstructed by the both end edges 63A of the lower film 63, and is returned into the supply port 52.

  When the toner enters the downstream seal 62, the toner on the downstream seal 62 is pushed by the rotating developing roller 31 and between the hair bundles CB tilted downstream along the rotation direction. The second guide passage G2 (or between the plurality of hairs C constituting the hair bundle CB) moves downstream. As a result, the toner is carried on the developing roller 31 while the toner moves on the downstream side seal 62 along the rotational direction and returned to the upstream side seal 61. Thereafter, the toner advances obliquely on the upstream side seal 61 and is returned to the supply port 52 as described above.

According to the above, the following effects can be obtained in the present embodiment.
Even when the toner enters the surface of the upstream seal 61, the toner can be returned to the supply port 52 by the upstream seal 61 that feeds the toner at an angle, so that toner leakage can be suppressed. Furthermore, since toner does not collect at both end edges 63A of the lower film 63, toner leakage and damage to the developing roller 31 due to toner collecting at both end edges 63A of the lower film 63 can be suppressed.

  Since the angle β with respect to the rotation direction (arrow RD) of both end edges 63A of the lower film 63 is larger than the angle α with respect to the rotation direction in the toner feeding direction by the upstream side seal 61, toner accumulates at both end edges 63A of the lower film 63. This can be suppressed more reliably.

  Even when the toner enters the downstream seal 62, the toner is carried by the developing roller 31 while moving on the downstream seal 62 along the rotational direction to the downstream side, and the toner reaches the upstream seal 61. Since the toner is returned, the toner can be returned to the supply port 52 by the upstream side seal 61 and toner leakage can be suppressed.

  Since the surface member 61B of the upstream side seal 61 is disposed on the surface member 62B of the downstream side seal 62, it is possible to prevent the downstream side seal 62 from being turned by the rotation of the developing roller 31. it can.

  Since the downstream seal 62 is brought into close contact with the left and right end edges BE of the pressing member 32B of the layer thickness regulating blade 32, toner leakage from between them can be suppressed.

  Since the upstream side seal 61 extends to the supply port 52 side than the downstream side seal 62, the toner flows between the left and right edge BE of the pressing member 32B and the downstream side seal 62 from the supply port 52 to the upstream side. It can be suppressed by the extended portion of the side seal 61.

  Since the concave developer receiving portion 70 is formed on the upstream side of the upstream side seal 61, the toner conveyed by the developing roller 31 from the downstream side seal 62 is scraped off at the edge of the upstream side seal 61 and dropped. Even in such a case, since the toner can be received by the developer receiving portion 70, toner leakage from the developing cartridge 28 can be suppressed.

  Since the relatively wide guide passages G1 and G2 can be formed between the hair bundles CB tilted in the predetermined direction, the toner can be smoothly fed in the predetermined direction. In addition, it is desirable that each hair bundle CB is formed to have such a length that the hair tip abuts on the root portion of the adjacent hair bundle CB. According to this, since it is possible to suppress the toner from flowing out from one guide passage to the adjacent guide passage, the toner flow can be made smooth and the toner can be returned to the supply port 52 more favorably.

  Since the base material 62A of the downstream seal 62 is pasted so as to protrude to the upstream side of the metal plate 32A of the layer thickness regulating blade 32, the base material 61A of the upstream seal 61 and the surface member 62B of the downstream seal 62 It is possible to suppress toner leakage from between the two.

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 above embodiment, the configuration is such that the toner is fed in the predetermined direction by tilting the hair bundle CB in the predetermined direction, but the present invention is not limited to this. For example, the toner can be obtained by providing a plurality of rows in which a plurality of hair bundles standing upright with respect to the base sheet are arranged close to each other in a predetermined direction (the oblique direction or the downstream direction along the rotation direction). May be configured to be sent in a predetermined direction. Further, the yarn exposed on the developing roller 31 side of the woven fabric is woven so as to be aligned in a predetermined direction (the direction toward the downstream side along the oblique direction or the rotation direction described above), so that the toner is sent in the predetermined direction. You may comprise.

  In the embodiment, the surface member 62B of the downstream seal 62 is formed so as to protrude from the base material 62A to the upstream side, but the present invention is not limited to this, and the surface member 61B of the upstream seal 61 is removed from the base material 61A. You may form so that it may protrude downstream. Even in this case, the surface member 61B of the upstream seal 61 can be overlaid on the surface member 62B of the downstream seal 62, so that the downstream seal 62 is prevented from being turned by the rotation of the developing roller 31. be able to.

  In the embodiment, the downstream seal 62 is attached to the metal plate 32A of the layer thickness regulating blade 32, but the present invention is not limited to this. For example, when the metal plate 32 </ b> A of the layer thickness regulating blade 32 is formed with the same dimensions as the pressing member 32 </ b> B in the left-right direction, the downstream seal 62 may be directly attached to the developing device housing 50.

In the above embodiment, the developing cartridge 28 integrally including the toner storage chamber 34 is employed as the developing device. However, the present invention is not limited to this, and for example, a cartridge to / from which the toner cartridge having the toner storage chamber is attached / detached is used as the developing device. It may be adopted.
In the above-described embodiment, the toner is sent through the guide passages G1 and G2 formed between the plurality of hair bundles CB tilted in a predetermined direction. The plurality of bristles may be tilted in a predetermined direction so that toner is sent along each bristles.

  In the embodiment, the resin-made lower film 63 is used as the long seal member. However, the present invention is not limited to this, and may be a sheet-like urethane sponge, for example.

1 is a side sectional view showing a laser printer provided with a developing cartridge according to an embodiment of the present invention. FIG. 6 is a side sectional view showing a developing cartridge. An enlarged perspective view (a) showing the structure around the side seal member, a cross-sectional view (b) showing the details of the side seal member, an enlarged perspective view (c) of the portion X in FIG. 3 (a), and FIG. It is an enlarged perspective view (d) of the Y part of (a). FIG. 6 is a front view showing a direction in which toner is fed by an upstream seal and a downstream seal and angles of both end edges of the lower film.

Explanation of symbols

28 Developing Cartridge 31 Developing Roller 32 Layer Thickness Restricting Blade 50 Developing Device Housing 52 Supply Port 60 Side Seal Member 61 Upstream Seal 61A Base Material 61B Surface Member 62 Downstream Seal 62A Base Material 62B Surface Member 63 Lower Film 63A Both End Edges 70 Developer receiving portion BS base sheet C hair CB hair bundle G1 first guide passage G2 second guide passage

Claims (9)

A developer carrying member carrying the developer;
A developer housing that rotatably supports the developer carrier and has a supply port for supplying the developer to the developer carrier;
A layer thickness regulating blade that is provided in the developer housing and regulates the thickness of the developer on the developer carrying member in sliding contact with the developer carrying member;
A side seal member provided between both end portions of the developer carrier and a portion adjacent to the supply port in the developer housing, and capable of sliding contact with the developer carrier;
A sheet-like long seal member that extends along the axial direction of the developer carrier, is in sliding contact with the developer carrier, and has both end portions overlapped with the side seal member,
The side seal member is configured to send the developer in an oblique direction toward the supply port as it goes downstream in the rotation direction of the developer carrier.
Both ends of the long seal member are formed along an oblique direction toward the supply port toward the downstream side in the rotation direction of the developer carrier.   2. The developing device according to claim 1, wherein an angle of the both end edges of the long seal member with respect to the rotation direction is larger than an angle of the developer feeding direction of the side seal member with respect to the rotation direction. The side seal member has an upstream seal that overlaps with the long seal member, and a downstream seal that is provided on the downstream side in the rotational direction with respect to the upstream seal,
The upstream seal is
It is configured to send the developer in an oblique direction toward the supply port side toward the downstream side in the rotation direction,
The downstream seal is
The developing device according to claim 1, wherein the developing device is configured to send the developer to the downstream side along the rotation direction. The side seal member is
A base material having elasticity, and a surface member provided on the surface of the base material on the developer carrying body,
The developing device according to claim 3, wherein the surface member of the upstream side seal is disposed on the surface member of the downstream side seal.   5. The downstream seal according to claim 3, wherein the downstream seal is in close contact with both end edges of a pressing portion that is a portion pressed against the developer carrying member of the layer thickness regulating blade. Development device.   The developing device according to claim 5, wherein the upstream side seal extends to the supply port side with respect to the downstream side seal.   The developing device according to any one of claims 3 to 6, wherein a sliding contact portion of the upstream seal with the developer carrying member is constituted by a plurality of hairs that are planted. .   The developing device according to claim 7, wherein the bristles are tilted toward the oblique direction.   The developing device according to claim 3, wherein a concave developer receiving portion is formed on a side of the upstream seal opposite to the downstream seal.

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