JP2009198976A - Developing device and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent color mixing without degrading productivity with a simple configuration. <P>SOLUTION: When an opening part 84 is opened, a control section 62 rotates a contact part 98 around a shaft part 96 such that the contact part 98 comes into contact with an opening/closing member 85 at a position farthest from the shaft part 96. The opening/closing member 85 is pressed to the contact member 94 against energization applied by an energizing member 93, and accordingly the opening part 84 is almost completely opened and a developer in the developer container 80 is supplied to a developing roll 68. When the contact member 94 rotates by a predetermined amount, the position where the contact part 98 is in contact with the opening/closing member 85 changes, and about a half of the opening part 84 is opened, and the opening/closing member 85 is located between the upper surface of developer in the developer container 80 and the attracting pole of the magnet 90, thus interrupting the supply of developer. When the contact member 94 further rotates, the opening/closing member 85 comes into contact with the contact part 98 at a position closest to the shaft part 96, thus closing the opening part 84 by the energization of the energizing member 93. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a developing device and an image forming apparatus.

  Patent Document 1 discloses a magnetic brush developing device including a plurality of developer supply devices that can be controlled independently from one developing sleeve. Patent Document 2 discloses a magnetic brush developing device in which a developing sleeve arranged close to a latent image carrier, a plurality of developer powder storage containers, and a magnet roll are provided for each container. Patent Document 3 discloses a multicolor developing device in which a developer storage tank stores a plurality of types of developers, and a developing sleeve and a transport sleeve are provided. Patent Document 4 discloses a developing device having a roller that feeds a developer to the developing sleeve by rotating, and a collecting member that collects the developer around the developing sleeve when the roller stops. Patent Document 5 discloses a liquid developing device in which a developing solution and a cleaning solution can be alternately circulated in a developing device.

JP-A-54-73646 JP 54-124733 A Japanese Patent Laid-Open No. 61-020961 Japanese Patent Laid-Open No. 61-201271 JP-A-5-158321

  SUMMARY OF THE INVENTION An object of the present invention is to provide a developing device and an image forming apparatus that can prevent color mixing without reducing productivity with a simple configuration.

  In order to achieve the above object, the present invention according to claim 1 provides a developing roll for supplying a developer to an image holding member, a rotating member that rotates about a rotating shaft, and a rotating member that is provided on the rotating member. A plurality of developer accommodating portions individually accommodating a plurality of color developers to be supplied to the roll, and the developer accommodating portion is a development provided with an opening for supplying the developer to the developing roll. A developer container main body and an opening / closing member that opens and closes the opening by displacement, and the opening / closing member blocks the supply of the developer in a state where the opening is opened so that the developer can be supplied. And a developing device that displaces at least a state in which a part of the opening is closed and a state in which the opening is closed.

  The present invention according to claim 2 is the developing device according to claim 1, wherein the opening / closing member is displaced so as to open / close the opening according to the rotation of the rotating body.

  According to a third aspect of the present invention, there is provided an image holding member, a developing roll for supplying a developer to the image holding member, a rotating member that rotates about a rotation shaft, and the developing roller provided on the rotating member. A plurality of developer accommodating portions that individually accommodate a plurality of color developers to be supplied to the developer, wherein the developer accommodating portion is provided with an opening for supplying the developer to the developing roll. A container main body; and an opening / closing member that opens and closes the opening by displacement. The opening / closing member opens the opening so as to supply the developer, and blocks supply of the developer. An image forming apparatus that displaces a state in which a part of the opening is closed and a state in which the opening is closed at least sustainably.

  The present invention according to claim 4 is the image forming apparatus according to claim 3, wherein the opening / closing member is displaced so as to open and close the opening in accordance with the rotation of the rotating body.

  The present invention according to claim 5 further includes a contact member that can directly or indirectly contact the opening and closing member, and the opening and closing member is a contact position of the contact member that directly or indirectly contacts the opening and closing member. The image forming apparatus according to claim 3, wherein the image forming apparatus opens and closes by changing.

  According to the first aspect of the present invention, color mixing can be prevented without reducing productivity with a simple configuration as compared with the case where the present configuration is not provided.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, color mixing can be achieved with a simple configuration and without reducing productivity compared to the case where the present configuration is not provided. Can be prevented.

  According to the third aspect of the present invention, color mixing can be prevented without reducing productivity with a simple configuration as compared with the case where the present configuration is not provided.

  According to the fourth aspect of the present invention, in addition to the effect of the present invention according to the third aspect, compared with the case where the present configuration is not provided, the color mixing is performed with a simple configuration without reducing the productivity. Can be prevented.

  According to the fifth aspect of the present invention, in addition to the effect of the present invention according to the third or fourth aspect, compared with the case where the present configuration is not provided, the productivity is reduced with a simple configuration. , Color mixing can be prevented.

Next, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an outline of an image forming apparatus 10 according to the first embodiment of the present invention. The image forming apparatus 10 includes an image forming apparatus main body 12, for example, a one-stage sheet feeding unit 14 is disposed on the back side (right side in FIG. 1) of the image forming apparatus main body 12.

  The paper feed unit 14 has a paper feed cassette 16 in which paper is stored. A take-out roll 18 for taking out paper from the paper feed cassette 16 is disposed above the paper feed cassette 16, and a supply roll 20 and a separating roll 22 are disposed in front of the take-out roll 18.

  The supply roll 20 is driven by a drive unit (not shown) and rotates so as to supply a sheet toward a conveyance path 24 described later. The roll 22 is pressed against the supply roll 20 and is rotatable in accordance with the rotation of the supply roll 20, so that the paper is supplied together with the supply roll 20 to a conveyance path 24 described later. Rotate.

  The conveyance path 24 is a sheet path from the supply roll 20 to the discharge port 26, and the conveyance path 24 is located at the upper part of the image forming apparatus main body 12 and is formed substantially horizontally from the paper supply unit 14 to the discharge port 26. ing. A secondary transfer roll 60 and a secondary transfer backup roll 54, which will be described later, are arranged on the upstream side of the fixing device 28 in the conveyance path 24, and the registration roll 30 is located upstream of the secondary transfer roll 60 and the secondary transfer backup roll 54. Is arranged. A discharge roll 32 is disposed in the vicinity of the discharge port 26 of the transport path 24.

  Accordingly, the paper taken out from the paper feeding cassette 16 of the paper feeding unit 14 by the take-out roll 18 is rolled by the supply roll 20 and the separating roll 22, and only the uppermost paper is guided to the transport path 24 and temporarily sent by the registration roll 30. The developer image is transferred between a secondary transfer roll 60 and a secondary transfer backup roll 54, which will be described later, at a timing, and the transferred developer image is fixed by the fixing device 28 and discharged. The paper is discharged from the discharge port 26 by the roll 32.

  In the image forming apparatus main body 12, for example, a developing device 34 is disposed at a substantially central portion. The developing device 34 visualizes an electrostatic latent image held by an image holding body 36 (to be described later) with developers of four colors of yellow, yellow, magenta, cyan, and black.

  In the developing device 34, for example, an image holding member 36 made of a photosensitive member is disposed so as to come into contact with the front side (left side in FIG. 1) of the image forming apparatus 10 from above. On the back side of the image carrier 36, a charging device 38 made of, for example, a charging roll for uniformly charging the image carrier 36 is provided. That is, a developing bias is applied to the image carrier 36. Further, the image carrier 36 is in contact with an image carrier cleaner 40 on the upstream side of the charging device 38 in the rotation direction of the image carrier 36. For example, the image carrier cleaner 40 scrapes off the developer remaining on the image carrier 36 after the primary transfer.

  Above the developing device 34, an exposure device 42 for writing a latent image on the image carrier 36 charged by the charging device 38 by a light beam such as a laser beam is disposed. Further, an intermediate transfer device 44 is provided on the front side of the image holding member 36 to primarily transfer the developer image visualized by the developing device 34 at the primary transfer position and convey it to a secondary transfer position described later.

  The intermediate transfer device 44 is, for example, an intermediate transfer body 46 such as an intermediate transfer belt, a primary transfer roll 48, support rolls 50 and 52, a secondary transfer position that faces the secondary transfer roll 60 and supports the intermediate transfer body 46. It comprises a next transfer backup roll 54 and tension rolls 56 and 58. The intermediate transfer body 46 is a primary transfer that comes into contact with the image carrier 36 in a lap between a support roll 50 disposed upstream of the primary transfer roll 48 and a support roll 52 disposed downstream of the primary transfer roll 48. The image holding member 36 is wound around the image holding member 36 within a predetermined range, and rotates according to the rotation of the image holding member 36. The tension rolls 56 and 58 apply a predetermined tension to the intermediate transfer member 46. Then, the intermediate transfer member 46 is primarily transferred by the primary transfer roll 48 so that the developer image on the image holding member 36 is superposed in the order of, for example, yellow, magenta, cyan, and black, and the developer image that has been primarily transferred will be described later. It is conveyed toward the secondary transfer roll 60.

  A secondary transfer roll 60 is disposed on the secondary transfer backup roll 54 of the intermediate transfer device 44 with the conveyance path 24 interposed therebetween. That is, the secondary transfer position is between the secondary transfer roll 60 and the secondary transfer backup roll 54, and the secondary transfer roll 60 is primary to the intermediate transfer body 46 with the assistance of the secondary transfer backup roll 54. The transferred developer image is secondarily transferred onto a sheet at the secondary transfer position. Here, the secondary transfer roll 60 is separated from the intermediate transfer body 46 while the intermediate transfer body 46 rotates three times, that is, while the developer images of three colors of yellow, magenta, and cyan are conveyed. When the developer image is transferred, it contacts the intermediate transfer member 46. In addition, a predetermined potential difference is generated between the secondary transfer roll 60 and the secondary transfer backup roll 54. For example, when the secondary transfer roll 60 is set to a high voltage, the secondary transfer backup is performed. The roll 54 is connected to a ground (GND) or the like.

  A fixing device 28 is disposed downstream of the secondary transfer position of the conveyance path 24. The fixing device 28 includes a heating roll and a pressure roll. The fixing device 28 fixes the developer image secondarily transferred to the sheet by the secondary transfer roll 60 and the secondary transfer backup roll 54, and is directed to the discharge roll 32. Transport.

  Further, inside the image forming apparatus 10, a control unit 62 that controls each unit constituting the image forming apparatus 10 is provided.

Next, the developing device 34 will be described in detail.
In FIG. 2, the developing device 34 is shown. The developing device 34 includes a developing device main body 66, a developing roll 68, and a layer thickness regulating member 70.

  The developing device main body (rotating body) 66 is provided with developer containers 80a to 80d that respectively store yellow, yellow, magenta, cyan, and black developers. For example, the developer containers 80a to 80d can be rotated counterclockwise around the shaft 82 (counterclockwise in FIG. 2), and the developer containers 80a to 80d are sequentially developed along the developer container switching path with the rotation shaft 82 as the center. 68 is moved to a position opposite to 68.

  The developer containers 80a to 80d include developer container main bodies 83a to 83d that individually store the above-described four color developers supplied to the developing roll 68, and the developer container main bodies 83a to 83d include Openings 84a to 84d for supplying the developer to the developing roll 68 are provided. The developer accommodating portion main bodies 83a to 83d are opened and closed by opening and closing members 85a to 85d that open and close the opening portions 84a to 84d, and the first stirring and conveying members 86a to 86d and the second stirring members disposed inside. Conveying members 88a to 88d are provided.

  In addition, the developer containers 80a to 80d are arranged on the developer container switching path with the openings 84a to 84d facing upward on the front side (left side in FIG. 2) according to the rotation of the developing device main body 66, for example. The opening / closing members 85a to 85d are displaced to open the openings 84a to 84d when the developer moves to the developer supply / recovery position facing the developing roll 68 (using FIG. 4 and the like). Later).

  The first stirring / conveying member 86 is a spiral member, for example, and rotates counterclockwise (counterclockwise in FIG. 2), and conveys the developer to the second stirring / conveying member 88 while stirring the developer. The second stirring / conveying member 88 is, for example, a spiral member that rotates counterclockwise to stir the developer, and when the developer container 80 moves to the developer supply / recovery position, the developer is removed. The toner is supplied to the developing roll 68. The first agitation and conveyance member 86 and the second agitation and conveyance member 88 convey the developer while stirring and circulate it in the developer container 80. When the developer container 80 moves to the developer supply / recovery position, the developer in the developer container 80 is supplied to the developing roll 68, and the developer remaining on the developing roll 68 is developed from the developing roll 68. It is collected in the medicine container 80.

The developer accommodated in the developer containers 80a to 80d is, for example, a two-component developer having a non-magnetic toner and a magnetic carrier, and the first agitating and conveying members 86a to 86d and the second agitating and conveying member. By stirring with 88a to 88d, the non-magnetic toner adheres around the magnetic carrier.
Hereinafter, in the case where any one of a plurality of components such as the developer containers 80a to 80d is not specified, it may be simply abbreviated as “developer container 80” or the like.

The developing roll 68 has a substantially cylindrical magnet 90 fixed with a plurality of N poles and S poles extending in the axial direction, and accommodates the magnet 90 inside, for example, counterclockwise (in the counterclockwise direction in FIG. 2). And a sleeve 92 that conveys the developer in the circumferential direction in accordance with the magnetic force of the magnet 90. A magnet 90 is disposed opposite to the image carrier 36 and supplies a magnetic pole (development pole) for supplying the developer on the developing roll 68 to the image carrier 36, and is disposed on the developer container 80 side and developed. A magnetic pole (attracting pole) for attracting the developer from the developer container 80 and a magnetic pole (peeling pole: for example, two adjacent S poles) arranged at the lower part on the developer container 80 side to repel the developer are provided. ing.
The layer thickness regulating member 70 regulates the layer thickness of the developer attached to the surface of the developing roll 68 (held by the developing roll 68).

Next, supply of the developer to the developing roll 68 and recovery of the developer from the developing roll 68 will be described.
As described above, the developer supply / recovery position of the developer container 80 is such that the developer container 80 faces the developing roll 68 on the developer container switching path in which the developer container 80 moves in accordance with the rotation of the developing device main body 66. It is the position moved to. When the developer container 80 moves to the developer supply / recovery position, the opening / closing member 85 is displaced, so that the opening 84 is opened.
Further, when the developer container 80 moves to the developer supply / recovery position, the distance to the upper surface of the developer is equal to or less than the distance at which the magnetic force of the attracting pole acts so as to attract the developer. The developer in the container 80 adheres to the surface of the sleeve 92 by the magnetic force of the attracting pole. That is, the developer stored in the developer container 80 is supplied to the developing roll 68.

The developer supplied to the developing roll 68 is supplied to the image carrier 36 by the action of the developing pole of the magnet 90 described above. Further, the developer remaining on the surface of the sleeve 92 is peeled off by the action of the peeling pole of the magnet 90 and collected in the developer container 80.
Note that the developer supply position of the developer container 80 that supplies the developer from the developer container 80 to the developing roll 68 and the developer container that blocks the supply of the developer from the developer container 80 to the developing roll 68. The developer supply blocking position of the developing device 80 and the developer collecting position of the developer container 80 that collects the developer from the developing roll 68 to the developer container 80 control the rotation stop position of the developing device main body 66. It may be different depending on the situation.

Next, a first embodiment of a mechanism for opening and closing the opening 84 by displacing the opening / closing member 85 will be described.
FIG. 3 is a side view showing the first embodiment of the mechanism for displacing the opening / closing member 85 and the periphery of the developer container 80. FIG. 3A shows a state in which the opening 84 is opened (during development). (B) is a side view showing a state in which the supply of the developer to the developing roll 68 is shut off, and (C) is a side view showing a state in which the opening 84 is closed (such as during non-development).
The opening / closing member 85 is urged in the direction of closing the opening 84 from above the rear side (right side in FIG. 3) by an urging member 93 such as a spring provided in the developer container 80, for example, both axial ends. Thus, the contact member 94 comes into contact. The contact member 94 is, for example, a cam provided with a cylindrical contact portion 98 that rotates or swings around a cylindrical shaft portion 96 as a rotation axis. The axial center of the contact portion 98 is deviated from the axial center of the shaft portion 96.

  As shown in FIG. 3A, when opening the opening 84, the control unit 62 centers on the shaft 96 so that the contact portion 98 contacts the opening / closing member 85 at a position farthest from the shaft 96. The contact member 94 is rotated. When the opening / closing member 85 is pushed by the contact member 94 against the urging force of the urging member 93, substantially all of the opening 84 is opened, and the developer in the developer container 80 is supplied to the developing roll 68. .

As shown in FIG. 3B, when the contact member 94 is rotated about 90 °, for example, counterclockwise (counterclockwise in FIG. 3) about the shaft portion 96 from the state shown in FIG. The contact position of the opening / closing member 98 with respect to the opening / closing member 85 changes, and the opening / closing member 85 closes the opening 84 by, for example, about half of the force by the biasing member 93. When the opening 84 is closed approximately half, the opening / closing member 85 is positioned between the upper surface of the developer accommodated in the developer accommodating container 80 and the attracting pole of the magnet 90 described above, and the developer accommodating container. The supply of the developer from 80 to the developing roll 68 is shut off.
Note that after the developer is supplied from the developing roll 68 to the image carrier 36, the developer remaining on the developing roll 68 is in a state where the opening 84 is almost completely opened and the developer on the developing roll 68. While about half of the opening 84 is closed so that the supply is shut off, it is collected in the developer container 80.

  As shown in FIG. 3C, when the contact member 94 rotates about 90 °, for example, counterclockwise (counterclockwise in FIG. 3) about the shaft portion 96 from the state shown in FIG. 85 contacts the contact portion 98 at a position closest to the shaft portion 96, and closes the opening 84 by the urging force of the urging member 93.

  The contact member 94 may be provided individually for the developer containers 80a to 80d, or one contact member 94 may be provided around the developer supply / recovery position on the image forming apparatus main body 12 side.

Next, the operation of the image forming apparatus 10 according to the first embodiment of the present invention will be described.
When the image forming signal is sent, the image carrier 36 is uniformly charged by the charging device 38, and light is emitted from the exposure device 42 to the charged image carrier 36 based on the image signal. The light beam from the exposure device 42 exposes the surface of the image carrier 36 to form an electrostatic latent image.

The electrostatic latent image held on the image holding body 36 is developed by the developing device 34 for each color of the developer, and is primarily transferred to the intermediate transfer body 46. Then, the developer images of the respective colors are superimposed on the intermediate transfer body 46 to form a color image.
Here, the developing roller 68 is supplied with yellow, magenta, cyan, and black developers from developer containers 80a to 80d, respectively. The developer supplied excessively to the developing roll 68 is collected in the developer container 80 of the same color before the next color developer is supplied to the developing roll 68. The developer containers 80 a to 80 d block the supply of the developer to the developing roll 68 every time the development of one color by the developing roll 68 is completed. In the primary transfer, the waste developer remaining on the image carrier 36 is scraped off and collected by the image carrier cleaner 40.

  On the other hand, the paper stored in the paper feed cassette 16 is taken out by the take-out roll 18 by a paper feed signal or the like, and is fed by the supply roll 20 and the separating roll 22, and only the uppermost paper is guided to the transport path 24, and the registration The roller 30 is temporarily stopped by the roll 30 and is guided between the secondary transfer roll 60 and the secondary transfer backup roll 54 with timing. When the sheet is guided between the secondary transfer roll 60 and the secondary transfer backup roll 54, the developer image primarily transferred to the intermediate transfer body 46 is transferred by the secondary transfer roll 60 and the secondary transfer backup roll 54. Secondary transferred onto paper.

  The sheet onto which the developer image has been transferred is guided to the fixing device 28, and the developer image is fixed by a heating roll and a pressure roll. The sheet on which the developer image is fixed is discharged from the discharge port 26 by the discharge roll 32.

Next, a second embodiment of the mechanism for opening and closing the opening 84 by displacing the opening / closing member 85 will be described.
FIG. 4 is a side view showing a second embodiment of the mechanism for opening / closing the opening 84 by displacing the opening / closing member 85. In FIG. 4, the same components as those shown in FIG. 2 are denoted by the same reference numerals.
The opening / closing member 85 is urged in a direction to close the opening 84 from above the rear side (right side in FIG. 4) by an urging member such as a spring (not shown).
Further, for example, in the vicinity of both ends in the axial direction of the developing roll 68, a movement restricting portion 100 that restricts the movement of the opening / closing member 85 according to the contact position with the opening / closing member 85 is provided.

  When the developing device main body 66 rotates and the developer container 80 moves and approaches the developer supply / recovery position, the movement restricting unit 100 contacts the opening / closing member 85 and restricts the movement of the opening / closing member 85. When the developing device main body 66 continues to rotate after the opening / closing member 85 comes into contact with the movement restricting portion 100, the developer containing portion main body 83 continues to move in a state where the movement of the opening / closing member 85 is restricted, and the developer container 80 When moved to the developer supply / recovery position, substantially all of the openings 84 are opened.

When the supply of the developer from the developing roller 68 to the image carrier 36 is completed, the developing device main body 66 further rotates, and the contact position of the movement restricting portion 100 with respect to the opening / closing member 85 changes. Here, for example, about half of the opening 84 is closed by biasing by a biasing member such as a spring (not shown), so that the supply of developer from the developer container 80 to the developing roll 68 is blocked. In the part 100, the shape of the part with which the opening / closing member 85 contacts is adjusted.
Note that after the developer is supplied from the developing roll 68 to the image carrier 36, the developer remaining on the developing roll 68 is in a state where the opening 84 is almost completely opened and the developer on the developing roll 68. While about half of the opening 84 is closed so that the supply is shut off, it is collected in the developer container 80.

  When the developer remaining on the developing roll 68 is collected in the developer container 80, the developing device main body 66 further rotates, so that the opening / closing member 85 moves to a position where it does not come into contact with the movement restricting portion 100. When the opening / closing member 85 does not come into contact with the movement restricting portion 100, all the openings 84 are closed by biasing by a biasing member such as a spring (not shown).

  In the above-described embodiment, the case where an electrostatic latent image is visualized using a two-component developer has been described as an example. However, the present invention is not limited to this. For example, the developing device 34 uses a one-component developer. The electrostatic latent image may be visualized.

1 is a side view showing an outline of an image forming apparatus according to a first embodiment of the present invention. 1 is a side view showing a developing device according to an embodiment of the present invention. FIG. 6 is a side view showing a first embodiment of a mechanism for displacing the opening / closing member 85 and the periphery of the developer container 80, where FIG. 7A shows a state where the opening 84 is opened (during development); ) Shows a state in which the supply of the developer to the developing roll 68 is interrupted, and (C) is a side view showing a state in which the opening 84 is closed (such as when not developing). It is a side view which shows the 2nd Example of the mechanism which displaces the opening-and-closing member 85 and opens and closes the opening part 84. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 14 Paper supply unit 24 Conveying path 28 Fixing apparatus 34 Developing apparatus 36 Image holding body 38 Charging apparatus 42 Exposure apparatus 44 Intermediate transfer apparatus 54 Secondary transfer backup roll 60 Secondary transfer roll 62 Control part 66 Developing apparatus main body 68 Developing roll 70 Layer thickness regulating member 80a-80d Developer container 82 Rotating shaft 83a-83d Developer container main body 84a-84d Opening 85a-85d Opening / closing member 86a-86d First stirring and conveying member 88a-88d Second Agitating and conveying member 90 Magnet 92 Sleeve 94 Contact member 96 Shaft portion 98 Contact portion 100 Movement restricting portion

Claims (5)

A developing roll for supplying a developer to the image carrier;
A rotating body that rotates about a rotation axis;
A plurality of developer accommodating portions that are provided in the rotating body and individually accommodate a plurality of color developers supplied to the developing roll;
The developer container is
A developer container main body provided with an opening for supplying the developer to the developing roll;
An opening and closing member for opening and closing the opening by displacement,
The opening / closing member is
The state where the opening is opened so that the developer can be supplied, the state where a part of the opening is closed and the state where the opening is closed so as to cut off the supply of the developer are displaced at least sustainably. Development device. The opening / closing member is
The developing device according to claim 1, wherein the opening is displaced so as to open and close according to the rotation of the rotating body. An image carrier,
A developing roll for supplying a developer to the image carrier;
A rotating body that rotates about a rotation axis;
A plurality of developer accommodating portions that are provided in the rotating body and individually accommodate a plurality of color developers supplied to the developing roll;
The developer container is
A developer container main body provided with an opening for supplying the developer to the developing roll;
An opening and closing member for opening and closing the opening by displacement,
The opening / closing member is
The state where the opening is opened so that the developer can be supplied, the state where a part of the opening is closed and the state where the opening is closed so as to cut off the supply of the developer are displaced at least sustainably. Image forming apparatus. The opening / closing member is
The image forming apparatus according to claim 3, wherein the opening is displaced so as to open and close according to the rotation of the rotating body. A contact member that can directly or indirectly contact the opening and closing member;
The opening / closing member is
The image forming apparatus according to claim 3, wherein the image forming apparatus opens and closes when the contact position of the contact member that directly or indirectly contacts the opening and closing member changes.

Images