JP2008292796A - Developing device and electrophotographic apparatus equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a developing device for suppressing an increase in rotation load by reducing remaining toner. <P>SOLUTION: A sheet-like separation member 29 having a plurality of holes is disposed between a toner storage chamber 26 and a toner collecting chamber 28. A rotating stir member 32 in the toner collecting chamber 28 has a crank shape having no shaft in its rotation center. The member 32 has a plurality of sheet-like conveying members 33 at the leading end of the crank shape so as to correspond to the holes of the separating member 29. The sheet-like conveying members 33 fit into the holes of the sheet-like separating member 29 by the rotation of the rotating stir member 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a developing device applied to a printer, a facsimile, a copying machine, and the like, and an electrophotographic apparatus including the developing device.

  In an electrophotographic apparatus, as a non-magnetic one-component developing apparatus that forms a toner image on a photosensitive member by contacting a photosensitive member that moves upward from the lower side of the apparatus, Japanese Patent No. 3441737 or JP-A-2005-128541. No. 2000, JP-A 2000-39759, etc. have been proposed. As an example, FIG. 8 shows a configuration of a conventional developing device described in Japanese Patent No. 3441737.

  In FIG. 8, 1 is a developing roller that forms a charged toner thin layer and conveys the toner to the photosensitive member, 2 is a conveying roller that conveys the toner to the developing roller 1, and 3 is agitating the toner and is conveyed to the conveying roller 2 Toner conveying blade for conveying toner, 5 is a regulating blade for regulating the amount of toner adhering to the developing roll 1, 6 is a toner storage chamber for storing toner, 9 is toner, 10 is a photoreceptor, and 12 is supplying toner 9. The toner supply chamber 13 is a toner collection chamber for collecting excess toner 9 regulated by the regulation blade 5. Reference numeral 4 denotes a rotary stirring member that stirs the toner in the toner recovery chamber 13 to prevent stagnation and lumps and scrapes and conveys the toner to the toner storage chamber 6 side.

  As shown in FIG. 9, the rotating stirring member 4 has a structure that prevents toner adhesion and accumulation on the rotation center shaft by forming a crank shape having no shaft at the rotation center, as shown in FIG. Yes.

  On the other hand, in JP-A-2005-128541, a member having a plurality of holes called recovery holes is provided between the toner storage chamber 6 and the toner recovery chamber 13, and an elliptical rotation called a recovery roller is provided in the toner recovery chamber. A member is arranged to reduce the flow of toner from the toner supply chamber to the toner recovery chamber, while the toner in the toner recovery chamber is discharged to the toner supply chamber by an elliptical rotating member.

Japanese Patent No. 3441737 JP 2005-128541 A JP 2000-39759 A

  However, the above-described conventional configurations have a drawback in that the collected toner is efficiently conveyed to the toner storage chamber for the reasons described later, and the toner gradually accumulates in the toner collection chamber and the rotation load of the developing roll. There is a problem of inviting an increase in This phenomenon is particularly noticeable when images with a low blackening rate are printed continuously. This is because the amount of toner transferred from the developing roll to the photoreceptor is small, so that the excess toner regulated by the regulating blade increases, and a large amount of toner is collected in the toner collection chamber.

  Further, remaining usable toner in the toner recovery chamber is a waste of toner, which is disadvantageous for the user. Further, when the developing device is reused, dealing with the toner remaining in the developing device is a large environmental burden.

  First, as in Patent Document 1, in the crank shape having no shaft at the rotation center, the toner stirred in the toner recovery chamber is only near the wall surface of the toner recovery chamber, so that the toner stirring is not performed in the vicinity of the other toner recovery chamber centers. Insufficient toner mass will be formed gradually. Further, since the toner scraping and conveyance from the toner recovery chamber to the toner storage chamber is performed only at the tip of the crank portion, the amount of toner scraping and conveyance to the toner storage chamber is small. Further, since the toner from the toner conveyance blade in the toner storage chamber flows back to the toner collection chamber, the toner collection chamber has not only the excess toner from the developing roller by the regulating blade but also the toner storage chamber by the rotation of the toner conveyance blade. The toners will merge. As a result, residual toner is always present in the toner recovery chamber, and the above-described problem occurs due to the accumulation of the residual toner.

  On the other hand, as in Patent Document 2, the backflow of toner from the toner storage chamber to the toner recovery chamber is reduced by closing the space between the toner recovery chamber and the toner storage chamber with a member having a plurality of holes. However, on the other hand, the amount of toner discharged from the toner recovery chamber to the toner storage chamber decreases, and as a result, excess toner from the developing roll by the regulating blade gradually accumulates in the toner recovery chamber. Furthermore, the member in the toner recovery chamber is elliptical, but since there is a gap between the long axis and the wall of the toner recovery chamber, the gap becomes clogged with toner, and as a result, There is a possibility that the rotation load of the rotary stirring member is very large and the lock is generated.

  The present invention has been made to solve the above-described problems. By stably conveying the toner from the toner recovery chamber to the toner storage chamber, the residual toner of the developing device is reduced, and the rotational load of the developing device is increased. Another object of the present invention is to provide an environment-friendly developing device and electrophotographic apparatus that do not waste toner for the user.

  In order to achieve the above object, the first feature of the present invention is that a toner storage chamber for storing toner, which is a non-magnetic one-component developer, rotates from below to above at a position corresponding to the photoconductor, A toner carrier that forms a toner layer of the toner; a toner amount that adheres to the toner carrier; a regulating member that is disposed below the toner carrier; A toner supply chamber for supplying toner to the carrier, a toner recovery chamber for recovering excess toner regulated by the regulating member, a toner supply body for supplying toner to the toner supply chamber, and the toner recovery chamber. In the developing device including the rotating stirring member, a sheet-like separation member having a plurality of holes is provided between the toner storage chamber and the toner recovery chamber, and the rotation recovery of the toner recovery chamber is performed. The member has a crank shape without a shaft at the center of rotation, and has a plurality of sheet-like conveying members corresponding to the hole positions of the separation member at the crank front end, and the sheet-like conveying member is the rotating member. It is to be fitted into the hole of the sheet-like separation member by the rotation of the stirring member.

  The second feature of the present invention for achieving the above object is that the tip shape of the sheet-like conveying member is narrower than the sheet-like separation hole and has an L-shaped folded portion, and the root shape is The hole is wider than the hole of the sheet-like separation member, and the hole is blocked.

  In order to achieve the above object, the third feature of the present invention is that the rotary stirring member has a plurality of crank shapes having different radii with respect to the rotation center, and a plurality of sheet-like conveying members at least one crank tip. It is in having.

  According to the developing device of the present invention, it is possible to stably convey the toner from the toner recovery chamber to the toner storage chamber, and as a result, the residual toner in the developing device is reduced and the increase in the rotational load of the developing device is suppressed. On the other hand, it is possible to provide a developing device and an electrophotographic apparatus that are free of toner for the user and are environmentally friendly.

[Example 1]
Embodiments of a developing device and an electrophotographic apparatus according to the present invention will be described below with reference to the drawings.

  First, an outline of the electrophotographic apparatus according to the present invention will be described with reference to FIG. In FIG. 7, an intermediate transfer device 37 is disposed at the center of the apparatus, and a photosensitive device 36, a transfer device 39, and an intermediate transfer device cleaning unit 38 are disposed around the intermediate transfer device 37. A charger 40 is disposed around the photosensitive device 36. Developing devices 34K, 34Y, 34M, and 34C enclosing toners that are finely colored powders of four different colors are arranged in an overlapping manner, below which are optical devices 41, and further below are paper sheets. A paper holding means 42 and a paper supply device 43 for storing are arranged. Above the electrophotographic apparatus, a fixing device 44 and a paper discharge device 45 are arranged.

  In such a configuration, the charger 40 uniformly charges the surface of the photosensitive device 36. Next, image and character information by a personal computer, an image scanner or the like is exposed in dot units by the optical device 41 to form an electrostatic latent image on the surface of the photosensitive device 36.

  Thereafter, the electrostatic latent image is visualized as a toner image by supplying and developing the toner by any of the developing devices 34K, 34Y, 34M, and 34C, and is conveyed to the first transfer position T1. At the first transfer position T1, the toner image is transferred to the surface of the intermediate transfer device 37 due to a potential difference between the photosensitive device 36 and the intermediate transfer device 37 supplied from a power source (not shown). By repeating the above steps by the developing devices 34K to 34C as many times as necessary (four times in the case of full color), a toner image corresponding to image and character information is formed on the surface of the intermediate transfer device 37. Thereafter, the toner image is transferred onto the paper supplied from the paper holding means 42 by the paper supply device 43 by the transfer device 39 at the second transfer position T2. The sheet on which the toner image has been transferred is conveyed to the fixing device 44, where the toner image is fixed on the sheet, and is discharged by the sheet discharge device 45. The toner remaining in the intermediate transfer device 37 is cleaned by the intermediate transfer cleaning means 38.

  Next, the developing apparatus according to the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic cross-sectional view showing the configuration of a non-magnetic one-component developing apparatus showing an embodiment of the present invention. First, the configuration of the developing device will be described.

  Reference numeral 21 denotes a developing roller that forms a thin layer of charged toner and conveys toner to the photosensitive device 36, 22 is a supply roll that supplies toner to the developing roller 21, 23 is a toner supply chamber that supplies toner, and 24 is toner. Toner agitating blade for agitating and conveying toner to the toner supply chamber 23, 25 for a shaft to which the toner conveying blade 24 is attached, 26 for a toner storage chamber for storing toner, 27 for toner, and 28 for collecting toner The toner collecting chamber 29 is a separating member for separating the toner collecting chamber 28 and the toner storage chamber 26, and the separating member 29 is provided with a plurality of holes.

  30 is a sheet-like member disposed so as to be in contact with the lower side of the developing roll, 31 is a regulating blade that regulates the amount of toner adhering to the developing roll, 32 is a rotary stirring member that stirs the collected toner, and 33 is a sheet-like member. The conveying member 36 is a photosensitive member. Although the detailed shape of the rotary stirring member 32 will be described later, the shape is a crank shape without a shaft at the center of rotation, and a sheet-like transport member 33 is provided at the tip of the rotary stirring member 32.

  In this embodiment, the thickness of the separating member 29, the conveying member 33, and the toner conveying blade 24 is 0.1 mm, and the material is unified with a polyester film. The same material is used for the three parts of the separating member 29, the conveying member 33, and the toner conveying blade 24. The frictional charge is generated due to the friction when the three parts come into contact with each other due to the operation during toner conveyance. This is to prevent toner from adhering to any of the three parts and causing toner conveyance failure.

  Next, the operation will be described with reference to FIGS.

  In FIG. 1, toner storage chamber 26 stores toner 27 used for development. In this embodiment, a toner conveying blade 24 and a shaft 25 for conveying toner are provided in each chamber in the toner storage chamber 26, and the toner 27 is sequentially conveyed to the developing roll 21 side by their rotation. ing. There is a toner supply chamber 23 above the side surface of the developing roll 21, and the toner 27 transported to the forefront of the toner storage chamber 26 is a sheet-shaped separation member 29 with holes formed by the toner transport blades 24 of the toner storage chamber 26. Are conveyed to the toner supply chamber 23. A supply roll 22 made of conductive foamed polystyrene is disposed in the toner supply chamber 23, and the toner 27 supplied into the toner supply chamber 23 is supplied to the developing roll 21 side and pressed. In order to supply the developing roll 21 more stably, it is desirable to dispose the supply roll 22 in contact with the developing roll 21 about several hundred microns to several millimeters.

  The toner 27 supplied to the toner supply chamber 23 is pressed against the developing roll 21 by the rotation of the supply roll 22 and pressed against the developing roll 21 by the sheet-like member 30 disposed below the developing roll in the supply chamber 23. It leaks into the toner collection chamber 28. At this time, the toner 27 is slightly charged by friction with the developing roll 21, the sheet member 30, the supply roll 22, and the like, so that it adheres to the surface of the developing roll 21 made of a conductive member and forms a toner layer on the upper surface of the developing roll 21. .

  Thus, the toner layer formed on the developing roll 21 is regulated to a toner layer thickness and charge amount appropriate for development by a regulating blade 31 provided in the toner recovery chamber 28.

  The toner remaining due to the restriction by the restriction blade 31 flows down to the toner collection chamber 28 provided below the toner supply chamber 23. A rotating stirring member 32 is disposed in the toner collection chamber 28. When the rotating stirring member 32 rotates, the conveying member 33 provided at the tip thereof rotates. The conveyance member 33 has a shape of a plane part and a strip part, and the planar part and the strip part of the conveyance member 33 cover the separation member 29. The toner conveying blade 24 and the rotating stirring member 32 are interlocked by a gear (not shown), and the rotating stirring member 32 and the toner conveying member 33 rotate in accordance with the rotation of the toner conveying blade 24. Thus, it is possible to prevent the toner from the toner supply chamber 23 from flowing back to the toner collection chamber 28.

  On the other hand, the tip of the conveying member 33 is L-shaped, so that the toner on the wall surface of the collecting chamber 28 can be scraped out, and the toner can be held as a toner receiver. It is possible to reduce and increase the transport amount to the storage chamber 26.

  As a result, a gap is always maintained in the toner collection chamber 28, and the remaining toner regulated by the regulation blade 31 flows into the toner collection chamber 28 stably.

  Next, the shapes of the rotary stirring member 32 and the sheet-like separation member 29 in the present invention will be described with reference to FIG. The rotary stirring member 32 has a crank shape without a shaft at the center of rotation, and a sheet-like conveying member 33 is provided at the tip thereof. This prevents toner from accumulating at the center of rotation and causing lumps.

The shape of the conveying member 33 has a strip shape with an L-shaped tip at the tip, and a flat sheet shape at the base. The position of the strip portion at the tip of the conveying member 33 corresponds to the hole provided in the separating member 29, and the size is 33a <29a.
The strip-shaped portion of the transport member 33 passes through the hole of the separation member 29 and can be moved to the storage chamber side.

Next, the dimension 33b of the conveying member 33 and the dimension 29b of the separating member 29 are 33b> 29b.
The relationship is satisfied, and both the planar portion and the strip-shaped portion of the conveying member 33 have a dimensional relationship that can cover the hole portion of the separating member 29.

  Thus, when the rotary stirring member 32 rotates, the base flat portion of the conveying member 33 first closes the hole of the separating member 29, and when the L-shape at the tip of the conveying member 33 reaches the hole of the separating member 29, the elasticity of the sheet Will get into the hole.

  Next, the shape of the toner conveying blade 24 in the present invention will be described with reference to FIG. The toner conveying member includes a toner conveying blade 24 and a toner conveying blade mounting shaft 25, and two or one toner conveying blade 24 is attached. The toner conveying blade 24 is made of a polyester film and has a shape in which a plurality of holes are provided near the shaft 25 mounting position. The position of the hole is provided in the conveying blade 24 from the position of the shaft end of the conveying blade 24, and the toner flows from the hole portion of the toner conveying blade 24 and the toner is conveyed to the rear storage chamber 26 during toner conveyance. Prevent transportation.

  FIG. 4 is an explanatory diagram of the superiority and position of the holes provided in the conveying blade 24.

  As shown in FIG. 4 (1), in the shape in which the conveyance blade 24 has a hole, toner falls from the conveyance blade hole during toner conveyance, so that the toner that has fallen from the hole of the conveyance blade 24 stays in the storage chamber 26.

  In FIG. 4B, since no hole is provided in the toner conveyance blade 24, backflow conveyance from the storage chamber 26 in which the conveyance blade 24 is provided to the toner storage chamber 26 at the rear is performed. As a result, the toner 27 accumulates in the toner storage chamber 26 at the rear, and a conveyance defect occurs. Therefore, the toner conveying blade 24 of the present invention has a hole.

  4A to 4C are diagrams showing the positions and sizes of different holes, respectively. Detailed dimensions are omitted in this figure.

  The unevenness (A) is a reference diagram showing a region where the toner falls into the storage chamber 26 from the hole shape of the first toner conveying blade. The unevenness (B) is a diagram showing a region where the toner falls into the storage chamber 26 from the hole shape of the second toner conveying blade. Concavity and convexity (c) is a diagram in which irregularities (a) and (b) are added together. The convex portion is a region having a hole in the conveying blade 24, and indicates a region in which the toner falls from the hole in the conveying blade 24 to the storage chamber 26. The concave portion is a region where the toner conveying blade 24 has no hole, and indicates a region where the toner does not stay in the storage chamber 26 but is conveyed back to the storage chamber 26 behind. As shown in FIG. 4 (3) A, when one wing-shaped hole is provided for each conveyance wing, the toner is conveyed to the toner supply chamber 23 at the tip of the conveyance wing 24 and stored from the hole of the conveyance wing 24. It is possible to fall into the chamber 26 and keep it. However, the conveyance blade 24 bends due to a load applied to the conveyance blade edge during toner conveyance.

  When the hole shape is provided on the same line in the toner conveyance direction in FIG. 4 (3) B, the toner dropped from the conveyance blade 24 hole falls into the storage chamber 26, but the toner at the position where the hole of the conveyance blade 24 is not vacant. Is always conveyed to the rear storage chamber 26 and cannot stay in the storage chamber 26. The amount of toner remaining in the portion of the storage chamber 26 corresponding to the portion where the hole is not formed in the conveying blade 24 is decreased. The storage chamber 26 is divided into a portion where the toner remains and a portion where the toner does not remain, which causes a conveyance failure, resulting in a supply failure.

  FIG. 4C is a form applied to the present invention. When a plurality of holes are provided in the toner conveying blade 24, the hole of the other toner conveying blade 24 is different from the hole position of the first sheet. The hole of the 2nd conveyance blade 24 is installed in the position which does not have the hole of the 1st conveyance blade 24 provided in a position. As shown in FIG. 4 (3) C, the toner remains uniformly in the storage chamber 26, so that stable toner conveyance to the supply chamber 23 is possible.

  Next, toner conveyance of the developing device in the present invention will be described with reference to FIG.

  First, as shown in the upper diagram of FIG. 5, when the tip of the rotary stirring member 32 reaches the separation member 29, as shown in FIG. 2 described above, the conveying member 33 with respect to the length of the hole of the separation member 29. Since the flat surface portion is longer, the hole of the separation member 29 can be closed until the flat surface portion of the conveying member 33 reaches the upper portion of the hole of the separation member 29. As a result, it is possible to prevent the backflow of the toner 27 entering the collection chamber 28 by the toner conveying blade 24.

  As shown in the central view of FIG. 5, when the toner 27 in the transport is transported to the supply chamber 23 while being prevented from flowing back by the transport member 33, the strip-shaped portion of the transport member 33 is the collection chamber 28. It works to collect the toner on the wall.

  As shown in the lower diagram of FIG. 5, when the toner conveyed by the toner conveying blade 24 comes to a position where it is not conveyed back to the collection chamber 28, the conveying member 33 that conveys the toner 27 attached to the rotating stirring member 32 is the toner 27. Is collected and transported to the storage chamber 26. At this time, as shown in FIG. 2, since the strip portion of the transport member 33 can be moved to the storage chamber 26 side due to the dimensional relationship with the hole in the hole of the separation member 29, the toner 27 is transported to the storage chamber 26. It is possible.

With the above operation, the toner is not transported to the toner collection chamber 28 through the backflow path from the storage chamber 26, and the plane portion of the transport member 33 is moved by the rotation of the rotating stirring member 32 in the toner collection chamber 28. When the hole is reached, the toner is prevented from being conveyed backward. When the L-shaped tip reaches the hole, it fits into the hole of the separation member 29, and the toner in the toner recovery chamber 28 is conveyed to the storage chamber 26, thereby preventing the toner 27 from remaining in the recovery chamber 28. it can.
[Example 2]
As another embodiment of the present invention, the configuration of a rotary stirring member will be described with reference to FIG.

  The configuration shown in FIG. 2 is configured by adding a rotary stirring member 32B having a different rotation radius and a cap 35 that supports the rotary stirring member shaft. The conveying member 33 is attached to the rotating stirring member 32 (32A in the base drawing) having a larger distance from the rotation center.

  The rotating stirring member shaft 32B according to this configuration has a different distance from the rotation center to the tip thereof as compared with 32A. Therefore, when the toner is stirred in the collection chamber 28, the rotating stirring member shaft 32B is stirred at a different distance from the rotation center. Therefore, even when the proportion of toner in the collection chamber 28 increases, the toner in the collection chamber is agitated by the two shafts having different distances from the rotation center, so that the agitation performance is improved and toner lump formation is prevented. . Further, the toner in the collection chamber 28 is collected from the toner collection chamber 28 to the toner storage chamber 26 by each shaft by two shafts different from the rotation center, so that the toner can be returned to the toner storage chamber 26 more efficiently. Is possible. In this embodiment, the conveying member 33 is attached to one of the plurality of shafts, but there may be a plurality of conveying members 33.

  According to the above feature, first, the toner is stirred in the toner recovery chamber 28 by rotating a plurality of crank shapes having different radii of the rotary stirring member 32. Therefore, the toner near the center of the toner collection chamber 28 as well as the vicinity of the wall surface of the toner collection chamber 28 is sufficiently stirred.

  Further, the L-shaped folded portion of the sheet-like conveying member 33 provided on the crank of the rotary stirring member 32 moves along the wall surface of the toner collecting chamber 28, whereby the toner is scraped from the toner collecting chamber 28 to the toner storage chamber. Since the toner is transported, a larger amount of toner can be scraped out.

  Further, in accordance with the rotation of the toner supply body, the root portion of the sheet-like conveyance member provided in the rotary stirring member 32 closes the hole of the sheet-like separation member 29 provided in the toner storage chamber 26 and the toner recovery chamber 28. As a result, it is possible to prevent toner from flowing back from the toner storage chamber to the toner recovery chamber by the toner supply body 24.

  As described above, it is possible to provide a developing device or an image forming apparatus that realizes reduction of residual toner of the developing device by a simple method, reduces disadvantageous problems of the user due to residual toner, and reduces environmental load due to residual toner. it can.

1 is a cross-sectional view of a developing device according to an embodiment of the present invention. It is a perspective view of the rotation stirring member which concerns on the Example of this invention. FIG. 4 is a perspective view of a toner transport unit according to an exemplary embodiment of the present invention. FIG. 6 is an explanatory diagram illustrating an effect of a toner conveying blade according to an embodiment of the present invention. FIG. 6 is an operation explanatory diagram of a toner transport unit according to an embodiment of the present invention. It is a perspective view of the rotation stirring member which concerns on the Example of this invention. 1 is a schematic configuration diagram of an electrophotographic apparatus according to an embodiment of the present invention. It is sectional drawing of the conventional image development apparatus. It is a perspective view of the rotary stirring member used for the conventional developing device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 21 ... Development roll, 22 ... Supply roll, 23 ... Toner supply chamber, 24 ... Toner conveyance blade, 25 ... Shaft, 26 ... Toner storage chamber, 27 ... Toner, 28 ... Toner collection chamber, 29 ... Separation member, 30 ... Sheet Shaped member, 31 ... regulating blade, 32 ... rotary stirring member, 33 ... conveying member, 34 ... developing device, 35 ... cap, 36 ... photosensitive device, 37 ... intermediate transfer device, 38 ... intermediate transfer member cleaning means, 39 ... transfer 40: charger, 41: optical device, 42: paper holding means, 43: paper supply device, 44: fixing device, 45: paper discharge device, 46: electrophotographic device.

Claims (7)

A toner storage chamber for storing toner, which is a non-magnetic one-component developer, a toner carrier that rotates from below to above at a position corresponding to the photoreceptor, and forms a toner layer of the toner; and the toner carrier The amount of toner adhering to the body is regulated, a regulating member disposed below the toner carrying body, a toner supply chamber that contacts the toner carrying body and supplies toner to the toner carrying body, and the regulating member In a developing device comprising a toner collection chamber for collecting regulated excess toner, a toner supply body for supplying toner to the toner supply chamber, and a rotary stirring member disposed in the toner collection chamber,
A sheet-like separation member having a plurality of holes is provided between the toner storage chamber and the toner recovery chamber, and the rotating stirring member of the toner recovery chamber has a crank shape without an axis at the rotation center. A plurality of sheet-like conveyance members corresponding to the hole positions of the separation member at the tip of the shape, and the sheet-like conveyance members are formed into holes in the sheet-like separation member by the rotation of the rotary stirring member. A developing device that fits.   2. The developing device according to claim 1, wherein a leading end shape of the sheet-shaped conveying member is narrower than a hole of the sheet-shaped separating member and has an L-shaped folded portion, and a root shape is the sheet-shaped separating portion. A developing device having a shape wider than a hole of a member and closing the hole.   2. The developing device according to claim 1, wherein the rotary stirring member has a plurality of crank shapes having different radii with respect to the rotation center, and a plurality of sheet-like conveying members are provided at at least one crank front end. apparatus.   2. The developing device according to claim 1, wherein a plurality of the sheet-like transport members provided in the crank-shaped rotary stirring member are interlocked with a rotation cycle of the toner supply body, and the toner storage chamber, the toner recovery chamber, A developing device that closes a hole in the sheet-like separation member provided between the two.   2. The developing device according to claim 1, wherein a plurality of the sheet-like conveying members provided on the crank-shaped rotary stirring member are interlocked with a rotation cycle of the toner supply member while the toner supply member faces the toner supply member. The sheet-like separating member provided between the toner storage chamber and the toner collecting chamber is closed, and the plurality of sheet portions of the conveying member are interlocked so as to pass through the hole of the separating member. Developing device.   2. The developing device according to claim 1, wherein the toner supply body, the sheet-like separation member, and the sheet-like transport member are made of the same material.   An electrophotographic apparatus comprising the developing device according to claim 1.

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