JP4639695B2 - Developing device, image forming apparatus, and image forming system - Google Patents

Description

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

  Image forming apparatuses such as laser beam printers are already well known. Such an image forming apparatus has, for example, a photoconductor for carrying a latent image, and a developing device that develops the latent image carried on the photoconductor by a developer and is detachable from the image forming apparatus main body. When an image signal or the like is transmitted from an external device such as a host computer, the developing device is positioned at a developing position facing the photosensitive member, and the latent image carried on the photosensitive member is moved with the developer in the developing device. Development is performed to form a developer image, the developer image is transferred to a medium, and finally an image is formed on the medium.

  In order to realize the above-described function of developing the latent image carried on the photosensitive member, the above developing device includes a developer carrying roller for carrying the developer, and a developer on the developer carrying roller. A developer supply roller for supplying the developer. Such a developing device develops the latent image carried on the photosensitive member by the developer supplied by the developer supply roller and carried by the developer carrying roller.

The developer carrying roller and the developer supply roller are respectively attached to separate members, that is, an assembly member as an example of a first attachment member and a housing as an example of a second attachment member. Yes.
JP 2004-191524 A

  By the way, in order to appropriately exert the function of supplying the developer to the developer carrying roller of the developer supplying roller, it is necessary to accurately position the developer supplying roller and the developer carrying roller. Furthermore, it is desirable that such positioning be realized with a simple configuration.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a developing device, an image forming apparatus, and a developer supplying roller and a developer carrying roller that are positioned with high accuracy with a simple configuration. It is to realize an image forming system.

The present invention mainly includes a developer carrying roller for carrying a developer, a first attachment member to which the developer carrying roller is attached, and a developer supply roller for supplying the developer to the developer carrying roller. And a second attachment member to which the developer supply roller is attached , wherein a relative position between the first attachment member and the second attachment member is positioned, and the developer supply roller One end side bearing located on one end side in the longitudinal direction of the developing device and the other end side located on the other end side in the longitudinal direction of the developing device for receiving the shaft of the developer supply roller And the first mounting member has a first fitting hole into which the one end side bearing can be fitted, and the second mounting member has one end side into which the one end side bearing can be fitted. Second mating hole and front Has the other end bearing is capable of being fitted the other end a second mating Goana, wherein the developer supply roller, the one end bearing and before fitted on the one end side second fitting hole It is rotatably supported by the second mounting member via the other end side bearing fitted in the other end side second fitting hole, and is fitted in the one end side second fitting hole. The one end side bearing is fitted into the first fitting hole, so that the relative positions of the first mounting member and the second mounting member are positioned, and the shaft of the developer carrying roller is A second end bearing on one end side in the longitudinal direction of the developing device for receiving, and a second bearing on the other end side on the other end in the longitudinal direction of the developing device for receiving the shaft of the developer carrying roller. It has a second bearing, wherein the first mounting member, and the holder, the longitudinal direction of the holder A side plate located on one end side with the first fitting hole, which is composed of the holder, and the one end side second bearing can fit a one side first developing roller fitting hole, the other A first developing roller fitting hole on the other end side to which the second end bearing can be fitted, and the side plate has a second developing roller fitting hole on which the one end second bearing can be fitted. and said developer carrying roller is fitted one end side first developing roller fitting hole and the second developing roller fitted into the fitting hole engaged by said one end second bearing has the other end first developing roller The first mounting member is rotatably supported by the first mounting member through the second bearing on the other end side that is fitted in the fitting hole. A fourth pin that can be fitted with a pin on one of the second mounting members and the pin on the other. A fitting hole is provided, the pin is fitted into the fourth fitting hole, a positioning pin for positioning the developing device is provided on the side plate , and the length of the developing device is A positioning member for positioning the relative position of the other end side bearing and the other end side second bearing on the other end side in the direction, and the holder and the side plate constituting the first mounting member are made of metal And the second attachment member is made of resin.

  Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

  At least the following will be made clear by the description of the present specification and the accompanying drawings.

A developer carrying roller for carrying the developer, a first attachment member to which the developer carrying roller is attached, a developer supply roller for supplying the developer to the developer carrying roller, and the developer A second attachment member to which a supply roller is attached; and a bearing for positioning a relative position between the first attachment member and the second attachment member and receiving a shaft of the developer supply roller. A developing device.
In such a case, it is possible to realize a developing device in which the developer supply roller and the developer carrying roller are accurately positioned with a simple configuration.

  The first attachment member and the second attachment member each have a first fitting hole and a second fitting hole into which the bearing can be fitted, and the developer supply roller has the second fitting hole. The bearing that is rotatably supported by the second mounting member via the bearing that is fitted in the fitting hole, and the fitting that is fitted in the second fitting hole is the first fitting hole. It is good also as the relative position of said 1st attachment member and said 2nd attachment member being positioned by fitting to.

  The developer carrying roller has a second bearing for receiving the shaft, and the first mounting member has a third fitting hole into which the second bearing can be fitted, and the developer carrying roller. May be rotatably supported by the first attachment member via the second bearing fitted in the third fitting hole.

  Further, as the bearing, there is one end side bearing located on one end side in the longitudinal direction of the developing device, and the other end side bearing located on the other end side in the longitudinal direction of the developing device, and the second mounting member is The second fitting hole has one end side second fitting hole into which the one end side bearing can be fitted, and the other end side second fitting hole into which the other end side bearing can be fitted. The developer supply roller passes through the one end side bearing fitted in the one end side second fitting hole and the other end side bearing fitted in the other end side second fitting hole. The second mounting member is rotatably supported by the second mounting member, and the second bearing has one end-side second bearing located on one end side in the longitudinal direction of the developing device and the other end side in the longitudinal direction of the developing device. A second bearing on the other end side, wherein the first mounting member is the third fitting hole. And one end side third fitting hole into which the one end side second bearing can be fitted, and the other end side third fitting hole into which the other end side second bearing can be fitted, The developer carrying roller includes the one end-side second bearing fitted into the one end-side third fitting hole and the other end-side second bearing fitted into the other end-side third fitting hole. The first fitting member is rotatably supported by the first fitting member, and the first fitting member can be fitted with the one end side bearing only on one end side in the longitudinal direction of the developing device. The one end side bearing having a hole and fitting into the one end side second fitting hole is fitted into the first fitting hole, whereby the first attachment member and the second attachment member are The relative position may be determined.

Further, on one end side in the longitudinal direction of the developing device, a pin is provided in one of the first attachment member and the second attachment member, and a fourth fitting hole is provided in which the pin can be fitted in the other. The pin may be fitted in the fourth fitting hole.
In such a case, the positioning of the first mounting member and the second mounting member is more reliable.

Moreover, it is good also as having a positioning member for positioning the relative position of the said other end side bearing and the said other end side 2nd bearing in the longitudinal direction other end side of the said developing device.
In such a case, the positioning of the developer supply roller and the developer carrying roller becomes more reliable.

A developer carrying roller for carrying the developer; a first mounting member to which the developer carrying roller is attached; a developer supply roller for supplying the developer to the developer carrying roller; A second mounting member to which the developer supply roller is mounted; and a bearing for positioning the relative position of the first mounting member and the second mounting member and receiving the shaft of the developer supply roller. The first attachment member and the second attachment member each have a first fitting hole and a second fitting hole into which the bearing can be fitted, and the developer supply roller has the second fitting The bearing that is rotatably supported by the second mounting member via the bearing that is fitted in the fitting hole, and the fitting that is fitted in the second fitting hole is the first fitting hole. By mating with the front The relative position between the first mounting member and the second mounting member is positioned, and the second mounting member has a second bearing for receiving the shaft of the developer carrying roller. The developer carrying roller has a third fitting hole that can be fitted, and the developer carrying roller is rotatably supported by the first mounting member via the second bearing fitted in the third fitting hole. And the second mounting is provided with one end side bearing located on one end side in the longitudinal direction of the developing device and the other end side bearing located on the other end side in the longitudinal direction of the developing device. The member includes, as the second fitting hole, one end side second fitting hole into which the one end side bearing can be fitted, and the other end side second fitting hole into which the other end side bearing can be fitted. And the developer supply roller is fitted in the second fitting hole on the one end side. Via the one end side bearing and the other end side bearing fitted in the other end side second fitting hole, the second mounting member is rotatably supported, and as the second bearing, One end-side second bearing located on one end side in the longitudinal direction of the developing device, and the other end-side second bearing located on the other end side in the longitudinal direction of the developing device, wherein the first mounting member is As the third fitting hole, one end side third fitting hole into which the one end side second bearing can be fitted, and the other end side third fitting hole into which the other end side second bearing can be fitted, The developer carrying roller has the one end side second bearing fitted in the one end side third fitting hole and the other end side fitted in the other end side third fitting hole. The first mounting member is rotatably supported by the first mounting member via a second bearing. The one end side bearing fitted into the one end side second fitting hole has the first fitting hole into which the one end side bearing can be fitted only on one end side in the longitudinal direction of the developing device, By fitting into the first fitting hole, the relative position of the first mounting member and the second mounting member is positioned, and the first mounting member and the first mounting member are positioned at one end in the longitudinal direction of the developing device. A pin is provided on one of the two attachment members, and a fourth fitting hole is provided on the other, in which the pin can be fitted, and the pin is fitted in the fourth fitting hole. A developing device having a positioning member for positioning the relative position of the other end side bearing and the other end side second bearing on the other end side in the longitudinal direction of the apparatus can also be realized.
In this way, the effects of the present invention can be achieved more effectively because all the effects described above can be achieved.

A developer carrying roller for carrying the developer; a first mounting member to which the developer carrying roller is attached; a developer supply roller for supplying the developer to the developer carrying roller; A second mounting member to which a developer supply roller is mounted; and a bearing for positioning a relative position between the first mounting member and the second mounting member and receiving a shaft of the developer supply roller. An image forming apparatus including a developing device can also be realized.
In such a case, it is possible to realize an image forming apparatus in which the developer supply roller and the developer carrying roller are accurately positioned with a simple configuration.

A computer, and an image forming apparatus connectable to the computer, a developer carrying roller for carrying the developer, a first attachment member to which the developer carrying roller is attached, and the developer A developer supply roller for supplying developer to the carrying roller, a second attachment member to which the developer supply roller is attached, positioning the relative positions of the first attachment member and the second attachment member; and An image forming system having an image forming apparatus provided with a developing device having a bearing for receiving the shaft of the developer supply roller can also be realized.
In such a case, it is possible to realize an image forming system in which the developer supply roller and the developer carrying roller are accurately positioned with a simple configuration.

=== Example of Overall Configuration of Image Forming Apparatus ===
Next, an outline of a laser beam printer (hereinafter also referred to as a printer) 10 as an example of the image forming apparatus will be described with reference to FIG. FIG. 1 is a diagram illustrating main components constituting the printer 10. In FIG. 1, the vertical direction is indicated by arrows. For example, the paper feed tray 92 is disposed at the lower part of the printer 10, and the fixing unit 90 is disposed at the upper part of the printer 10.

  As shown in FIG. 1, the printer 10 according to this embodiment includes a charging unit 30, an exposure unit 40, a YMCK developing unit 50, a primary transfer unit 60, an intermediate transfer body 70, along the rotation direction of the photoconductor 20. A cleaning unit 75, and further, a secondary transfer unit 80, a fixing unit 90, a display unit 95 configured as a liquid crystal panel as a means for notifying a user, and a control for controlling these units and the like and controlling the operation as a printer. A unit 100 is included.

  The photoreceptor 20 has a cylindrical conductive substrate and a photosensitive layer formed on the outer peripheral surface thereof, and is rotatable around a central axis. In the present embodiment, the photoreceptor 20 is indicated by an arrow in FIG. Rotate clockwise.

  The charging unit 30 is a device for charging the photoconductor 20, and the exposure unit 40 is a device for forming a latent image on the photoconductor 20 charged by irradiating a laser. The exposure unit 40 includes a semiconductor laser, a polygon mirror, an F-θ lens, and the like, and charges the modulated laser based on an image signal input from a host computer (not shown) such as a personal computer or a word processor. The irradiated photoconductor 20 is irradiated.

  The YMCK developing unit 50 converts the latent image formed on the photoconductor 20 into toner T as an example of a developer accommodated in the developing device, that is, black (K) toner, magenta accommodated in the black developing device 51. An apparatus for developing using magenta (M) toner contained in the developing device 52, cyan (C) toner contained in the cyan developing device 53, and yellow (Y) toner contained in the yellow developing device 54 It is.

  The YMCK developing unit 50 can move the positions of the four developing devices 51, 52, 53, 54 by rotating with the four developing devices 51, 52, 53, 54 mounted. Yes. That is, the YMCK developing unit 50 holds the four developing devices 51, 52, 53, 54 by four holding portions 55a, 55b, 55c, 55d, and the four developing devices 51, 52, 53, 54 is rotatable around the central axis 50a while maintaining the relative position thereof. Each time image formation for one page is completed, it is selectively opposed to the photoconductor 20 and is formed on the photoconductor 20 with the toner T contained in each developing device 51, 52, 53, 54. The latent images are sequentially developed. Each of the four developing devices 51, 52, 53, 54 described above is detachably attached to the image forming apparatus main body, more specifically, the holding portions 55a, 55b, 55c, 55d of the YMCK developing unit 50. It is possible. When the developing devices 51, 52, 53, and 54 are attached to the holding portions 55a, 55b, 55c, and 55d, positioning pins 592 described later provided in the developing devices 51, 52, 53, and 54 form an image. The developing devices 51, 52, 53, and 54 are positioned on the image forming apparatus main body by being fitted in a positioning pin fitting hole 58 provided in the apparatus main body and into which the positioning pin 592 can be fitted (see FIG. 12). Details of each developing device will be described later.

The primary transfer unit 60 is a device for transferring a single color toner image formed on the photoconductor 20 to the intermediate transfer body 70. When four color toners are sequentially transferred in a superimposed manner, the full color toner is transferred to the intermediate transfer body 70. An image is formed.
The intermediate transfer body 70 is an endless belt in which an aluminum vapor deposition layer is provided on the surface of a PET film, and a semiconductive paint is formed on the surface layer and laminated.
The secondary transfer unit 80 is a device for transferring a single color toner image or a full color toner image formed on the intermediate transfer body 70 to a medium such as paper, film, or cloth.
The fixing unit 90 is a device for fusing a single-color toner image or a full-color toner image transferred onto a medium to form a permanent image.
The cleaning unit 75 is provided between the primary transfer unit 60 and the charging unit 30 and has a rubber cleaning blade 76 that is in contact with the surface of the photoconductor 20. The cleaning unit 75 is disposed on the intermediate transfer body 70 by the primary transfer unit 60. After the toner image is transferred, the toner T remaining on the photoconductor 20 is scraped off and removed by the cleaning blade 76.
As shown in FIG. 2, the control unit 100 includes a main controller 101 and a unit controller 102. An image signal and a control signal are input to the main controller 101, and in response to a command based on the image signal and the control signal. A unit controller 102 controls each of the units and forms an image.

Next, the operation of the printer 10 configured as described above will be described.
First, when an image signal and a control signal from a host computer (not shown) are input to the main controller 101 of the printer 10 via the interface (I / F) 112, the unit controller 102 based on a command from the main controller 101 Under the control, the photosensitive member 20, the developing roller as an example of the developer carrying roller, and the intermediate transfer member 70 are rotated. The photoconductor 20 is sequentially charged by the charging unit 30 at the charging position while rotating.

The charged area of the photoconductor 20 reaches an exposure position as the photoconductor 20 rotates, and a latent image corresponding to image information of the first color, for example, yellow Y, is formed in the area by the exposure unit 40. . In the YMCK developing unit 50, a yellow developing device 54 that contains yellow (Y) toner is located at a developing position facing the photoconductor 20.
The latent image formed on the photoconductor 20 reaches the development position as the photoconductor 20 rotates, and is developed with yellow toner by the yellow developing device 54. As a result, a yellow toner image is formed on the photoreceptor 20.
The yellow toner image formed on the photoconductor 20 reaches the primary transfer position as the photoconductor 20 rotates, and is transferred to the intermediate transfer body 70 by the primary transfer unit 60. At this time, a primary transfer voltage having a polarity opposite to the charging polarity of the toner T is applied to the primary transfer unit 60. During this time, the photosensitive member 20 and the intermediate transfer member 70 are in contact with each other, and the secondary transfer unit 80 is separated from the intermediate transfer member 70.

The above processing is sequentially executed for each developing device for the second color, the third color, and the fourth color, so that four color toner images corresponding to the respective image signals are transferred to the intermediate transfer member 70. It is transcribed and superimposed. As a result, a full color toner image is formed on the intermediate transfer member 70.
The full color toner image formed on the intermediate transfer body 70 reaches the secondary transfer position as the intermediate transfer body 70 rotates, and is transferred to the medium by the secondary transfer unit 80. The medium is conveyed from the paper feed tray 92 to the secondary transfer unit 80 via the paper feed roller 94 and the registration roller 96. When performing the transfer operation, the secondary transfer unit 80 is pressed against the intermediate transfer body 70 and a secondary transfer voltage is applied.
The full color toner image transferred to the medium is heated and pressed by the fixing unit 90 and fused to the medium.

  On the other hand, after the primary transfer position has passed, the photosensitive member 20 is scraped off by the cleaning blade 76 supported by the cleaning unit 75 and the toner T adhering to the surface thereof is charged to form the next latent image. Prepare for. The toner T thus scraped off is collected by a residual toner collecting unit provided in the cleaning unit 75.

=== Overview of Control Unit ===
Next, the configuration of the control unit 100 will be described with reference to FIG. The main controller 101 of the control unit 100 is connected to a host computer via an interface 112 and includes an image memory 113 for storing image signals input from the host computer. The unit controller 102 is electrically connected to each unit (charging unit 30, exposure unit 40, YMCK developing unit 50, primary transfer unit 60, cleaning unit 75, secondary transfer unit 80, fixing unit 90, display unit 95) of the apparatus main body. Each unit is controlled based on a signal input from the main controller 101 while detecting a state of each unit by receiving a signal from a sensor included in them.

=== Configuration Example of Developing Device ===
Next, a configuration example of the developing device will be described with reference to FIGS.
FIG. 3 is a perspective view of the developing device. FIG. 4 is a cross-sectional view showing main components of the developing device. FIG. 5 is a perspective view showing a state where the toner supply roller 550 is attached to the housing 540. FIG. 6 is a perspective view showing a state where the developing roller 510 is attached to the holder 526 shown in FIG. FIG. 7 is a perspective view showing a state in which the upper seal member 520 and the regulating blade 560 are assembled to the holder 526. FIG. 8 is a perspective view of the side plate 580. FIG. 9 is a perspective view showing a state in which the upper seal member 520, the regulating blade 560, and the developing roller 510 are assembled to the assembly member 525. FIG. 10 is a perspective view illustrating a state in which the assembly member 525 illustrated in FIG. 9 is attached to the housing 540 illustrated in FIG. FIG. 11 is a perspective reference view showing a state in which the side plate 580 is removed from the assembly member 525 shown in FIG. FIG. 12 is a perspective view showing a state in which the yellow developing device 54 is mounted on the holding portion 55d of the YMCK developing unit 50. FIG. 13 is a perspective view showing a state in which a bracket 630 is provided on the other end in the longitudinal direction of the yellow developing device 54. FIG. 14 is a perspective reference view showing a state of the other end in the longitudinal direction of the yellow developing device 54 before the bracket 630 is provided. FIG. 15 is a perspective view showing the back side of the bracket 630.

 Note that the cross-sectional view shown in FIG. 4 represents a cross-section obtained by cutting the developing device along a plane perpendicular to the longitudinal direction shown in FIG. 4, the vertical direction is indicated by arrows as in FIG. 1. For example, the central axis of the developing roller 510 is below the central axis of the photoconductor 20. Further, in FIG. 4, the yellow developing device 54 is shown in a state where the yellow developing device 54 is located at a developing position facing the photoconductor 20.

  The YMCK developing unit 50 includes a black developing device 51 containing black (K) toner, a magenta developing device 52 containing magenta (M) toner, a cyan developing device 53 containing cyan (C) toner, and a yellow ( Y) Although a yellow developing device 54 containing toner is provided, the configuration of each developing device is the same, so the yellow developing device 54 will be described below.

  The yellow developing device 54 includes a toner supply roller 550 as an example of a developer supply roller, a housing 540 as an example of a second attachment member to which the toner supply roller 550 is attached, a developing roller 510, an upper seal member 520, and a regulating blade. 560, an assembly member 525 as an example of a first attachment member to which the developing roller 510 is attached, and the like.

  The housing 540 is manufactured by welding a plurality of integrally formed resin housing parts, that is, an upper housing part 542 and a lower housing part 543, and accommodates the toner T therein. The toner container 538 is formed. The toner containing body 538 has two toner containing portions, that is, a first toner containing portion 538a and a second toner, by a partition wall 545 for partitioning the toner T projected inwardly (in the vertical direction in FIG. 4) from the inner wall. It is divided into a housing portion 538b. The upper portions of the first toner storage portion 538a and the second toner storage portion 538b are in communication, and the movement of the toner T is restricted by the partition wall 545 in the state shown in FIG. However, when the YMCK developing unit 50 rotates, the toner accommodated in the first toner accommodating portion 538a and the second toner accommodating portion 538b is once collected on the communicating portion side on the upper side at the developing position. When returning to the state shown in FIG. 4, the toners are mixed and returned to the first toner storage portion 538a and the second toner storage portion 538b. That is, as the YMCK developing unit 50 rotates, the toner T in the developing device is appropriately agitated. For this reason, in this embodiment, the toner container 538 is not provided with a stirring member, but a stirring member for stirring the toner T stored in the toner container 538 may be provided. As shown in FIG. 4, the housing 540 (that is, the first toner storage portion 538 a) has an opening 572 in the lower part, and a developing roller 510 described later is provided facing the opening 572. . Further, a pin fitting hole as an example of a fourth fitting hole provided in an assembly member 525 (side plate 580) to be described later is formed in the side wall 544 located on one end side in the longitudinal direction of the housing 540 (yellow developing device 54). 588 is provided with a pin 544a that can be fitted (FIG. 5).

  As shown in FIGS. 4 and 5, the toner supply roller 550 is provided in the first toner storage portion 538a described above, and supplies the toner T stored in the first toner storage portion 538a to the developing roller 510 described later. At the same time, the toner T remaining on the developing roller 510 after the development is peeled off from the developing roller 510. The toner supply roller 550 is made of polyurethane foam or the like, and is in contact with the developing roller 510 in an elastically deformed state. The toner supply roller 550 is disposed below the first toner storage portion 538a, and the toner T stored in the first toner storage portion 538a is transferred by the toner supply roller 550 below the first toner storage portion 538a. Supplied to the developing roller 510. As shown in FIG. 5, the toner supply roller 550 has two supply roller bearings 578 as an example of a bearing for receiving the shaft by the housing 540, that is, the toner supply roller 550 (yellow developing device 54). One end side supply roller bearing 578a as an example of one end side bearing located on one end side in the longitudinal direction, and the other end side supply roller bearing 578b as an example of the other end side bearing located on the other end side in the longitudinal direction , And is supported rotatably. More specifically, the housing 540 is fitted with the one-end-side supply roller bearing 578a as a supply roller fitting hole 546 as an example of a second fitting hole into which the supply roller bearing 578 can be fitted. One end side supply roller fitting hole 546a as an example of a possible one end side second fitting hole and another example of the other end side second fitting hole into which the other end side supply roller bearing 578b can be fitted. An end-side supply roller fitting hole 546b, and the toner supply roller 550 is fitted to the one-end-side supply roller fitting hole 546a and the one-end-side supply roller bearing 578a and the other-end-side supply roller. It is rotatably supported by the housing 540 through the other end side supply roller bearing 578b fitted in the joint hole 546b. As shown in FIG. 4, the toner supply roller 550 rotates in a direction (clockwise in FIG. 4) opposite to the rotation direction of the developing roller 510 (counterclockwise in FIG. 4). The central axis is below the rotational central axis of the developing roller 510. Note that a supply roller driving gear 610 for driving the toner supply roller 550 is provided at an end portion (one axial end side) of the toner supply roller 550 (FIG. 3).

The developing roller 510 carries the toner T and conveys it to a developing position facing the photoconductor 20. The developing roller 510 is made of an aluminum alloy such as 5056 aluminum alloy or 6063 aluminum alloy, an iron alloy such as STKM, or the like, and is subjected to nickel plating, chrome plating, or the like as necessary.
As shown in FIG. 6, the developing roller 510 has a shaft 510a and a large diameter portion 510b. The developing roller 510 has two developing roller bearings 576 as an example of a second bearing for the shaft 510a to receive the shaft 510a by a holder 526 described later, that is, the longitudinal direction of the developing roller 510 (yellow developing device 54). One end side developing roller bearing 576a as an example of one end side second bearing located on one end side, and the other end side developing roller bearing 576b as an example of the other end side second bearing located on the other end side in the longitudinal direction. , And is supported rotatably. As shown in FIG. 4, the developing roller 510 rotates in a direction (counterclockwise in FIG. 4) opposite to the rotation direction of the photoconductor 20 (clockwise in FIG. 4). The central axis is below the central axis of the photoconductor 20. A developing roller driving gear 612 for driving the developing roller 510 is provided at the end (one axial end side) of the developing roller 510 (FIG. 3).

  Further, a gap exists between the developing roller 510 and the photoconductor 20 in a state where the yellow developing device 54 faces the photoconductor 20. That is, the yellow developing device 54 develops the latent image formed on the photoconductor 20 in a non-contact state. When developing the latent image formed on the photoconductor 20, an alternating electric field is formed between the developing roller 510 and the photoconductor 20.

  The upper seal member 520 abuts the developing roller 510 along the axial direction thereof, allows the toner T remaining on the developing roller 510 after passing through the developing position to move into the housing 540, and The movement of the toner T in the housing 540 to the outside of the housing 540 is restricted. The upper seal member 520 is a seal made of a polyethylene film or the like. The upper seal member 520 is supported by an upper seal support portion 527 of a holder 526, which will be described later, and is provided such that its longitudinal direction is along the axial direction of the developing roller 510 (FIG. 7). The contact position where the upper seal member 520 contacts the developing roller 510 is above the central axis of the developing roller 510.

  4, the surface of the upper seal member 520 opposite to the contact surface 520b that contacts the developing roller 510 (this surface is also referred to as the opposite surface 520c), and the upper seal support portion An upper seal urging member 524 made of an elastic material such as malt plain is provided between the 527 and the 527 in a compressed state. The upper seal biasing member 524 presses the upper seal member 520 against the developing roller 510 by biasing the upper seal member 520 toward the developing roller 510 with the biasing force.

  The regulating blade 560 is in contact with the developing roller 510 along the axial direction thereof, regulates the layer thickness of the toner T carried on the developing roller 510, and gives electric charge to the toner T carried on the developing roller 510. To do. The regulation blade 560 has a rubber part 560a and a rubber support part 560b. The rubber part 560a is made of silicon rubber, urethane rubber or the like, and the rubber support part 560b is a thin plate having spring properties such as phosphor bronze or stainless steel.

  The rubber part 560a is supported by the rubber support part 560b, and the rubber support part 560b presses the rubber part 560a against the developing roller 510 by its urging force. The rubber support portion 560b is attached to the restriction blade support portion 528 in a state where one end thereof is supported by the restriction blade support portion 528 of the holder 526 described later.

  The end of the regulating blade 560 opposite to the side supported by the regulating blade support portion 528, that is, the tip is not in contact with the developing roller 510, and a portion away from the tip by a predetermined distance is developed. The roller 510 is in contact with a width. That is, the regulating blade 560 is not in contact with the developing roller 510 at the edge, but is in contact with the belly. The regulating blade 560 is disposed so that the tip thereof faces the upstream side in the rotation direction of the developing roller 510, and is in a so-called counter contact. The contact position where the regulating blade 560 contacts the developing roller 510 is below the central axis of the developing roller 510 and below the central axis of the toner supply roller 550.

  Further, an end seal 574 (FIG. 7) is provided on the outer side in the longitudinal direction of the rubber portion 560a of the regulating blade 560. The end seal 574 is formed of a non-woven fabric and abuts along the circumferential direction of the developing roller 510 at the axial end of the developing roller 510, and from between the peripheral surface and the housing 540. The function of preventing the leakage of the toner T is exhibited.

  The assembly member 525 is a metal member for assembling various members such as the developing roller 510 and the driving gear, and mainly includes two members, that is, one end in the longitudinal direction of the holder 526 and the holder 526 (yellow developing device 54). It is comprised from the side plate 580 located in the side (FIG. 9).

 The holder 526 is a metal member, and as shown in FIG. 7, the upper seal support portion 527 along the longitudinal direction (that is, the axial direction of the developing roller 510) and the longitudinal direction thereof (that is, the developing roller 510). A regulating blade support portion 528 along the axial direction), and provided outside the upper seal support portion 527 and the regulating blade support portion 528 in the longitudinal direction (the axial direction), and intersects the longitudinal direction (the axial direction). And a developing roller support portion 529.

 The developing roller support portion 529 has one end side developing roller support portion 529a located on one end side in the longitudinal direction of the holder 526 (yellow developing device 54) and the other end located on the other end side in the longitudinal direction of the holder 526 (yellow developing device 54). And a side developing roller support portion 529b. Further, the one end side developing roller support portion 529a and the other end side developing roller support portion 529b are respectively formed as a developing roller fitting hole 530 as an example of a third fitting hole into which the developing roller bearing 576 can be fitted. One end side developing roller fitting hole 530a as an example of one end side third fitting hole into which the one end side developing roller bearing 576a can be fitted, and the other end into which the other end side developing roller bearing 576b can be fitted. The other end side developing roller fitting hole 530b as an example of the side third fitting hole. The developing roller 510 is for one end side developing roller fitting hole 530a and the other end side developing roller fitting hole 530b and the other end side developing roller fitting hole 530b. It is rotatably supported by a holder 526 (assembly member 525) via a bearing 576b (FIG. 6). The one end side developing roller support portion 529a is provided with an intermediate gear support portion 531 for rotatably supporting an intermediate gear 614 described later.

 Further, the upper seal member 520 is supported by the upper seal support portion 527 at the short-side end portion 520a (FIG. 4), and the regulating blade 560 is at the short-side end portion 560c (FIG. 4). Thus, it is supported by the regulating blade support portion 528. Furthermore, as shown in FIG. 7, the regulating blade 560 supports an end seal 574 at its longitudinal end 560d.

 The side plate 580 is a metal member located only on one end side in the longitudinal direction of the yellow developing device 54. As shown in FIG. 8, the side plate 580 has a support portion fitting hole 582 into which the intermediate gear support portion 531 can be fitted, A developing roller fitting hole 584 into which the one end side developing roller bearing 576a can be fitted, and a supply roller fitting hole 586 as an example of a first fitting hole into which the one end side supply roller bearing 578a can be fitted. , A pin fitting hole 588 into which the pin 544a can be fitted, a developing device side gear support 590 for rotatably supporting a developing device side gear 616, which will be described later, and the yellow developing device 54 in the image forming apparatus main body. Positioning pins 592 for positioning.

 As shown in FIG. 9, the intermediate gear support 531 and the one end side development roller of the holder 526 in which the developing roller 510 and the like are attached to the support portion fitting hole 582 and the developing roller fitting hole 584 of the side plate 580. The assembly member 525 is configured by fitting the bearings 576a.

 As shown in FIGS. 10 and 11, the assembly member 525 configured in this way is provided with a housing seal 602 (FIG. 4) for preventing leakage of the toner T from between the assembly member 525 and the housing 540. The housing 540 is provided with the toner supply roller 550 shown in FIG. At this time, at one end in the longitudinal direction of the yellow developing device 54, one end provided in a housing 540 provided with a toner supply roller 550 in the supply roller fitting hole 586 and the pin fitting hole 588 of the assembly member 525. The side supply roller bearing 578a and the pin 544a are fitted to each other.

  In the above description, it has been described that the developing roller driving gear 612 and the supply roller driving gear 610 are provided at the end portions (one axial end side) of the developing roller 510 and the toner supply roller 550, respectively. As shown in FIG. 3, the device 54 includes a developing device side gear 616 and an intermediate gear 614 in addition to these gears.

  The developing device side gear 616 receives a driving force from the image forming apparatus main body, more specifically, from a main body side gear 56 described later in a state where the yellow developing device 54 is mounted on the image forming apparatus main body. This is a gear for transmitting a driving force to the developing roller driving gear 612 and the supply roller driving gear 610. The developing device side gear 616 is rotatably supported by the developing device side gear support portion 590 described above.

  The intermediate gear 614 is a gear serving as a medium when the developing device side gear 616 transmits a driving force to the developing roller driving gear 612 and the supply roller driving gear 610. That is, the developing device side gear 616 receives a driving force from the image forming apparatus main body in a state where the yellow developing device 54 is mounted on the image forming apparatus main body, and the developing roller driving gear 612 or the like via the intermediate gear 614. A driving force is transmitted to the supply roller driving gear 610. The intermediate gear 614 is rotatably supported by the intermediate gear support portion 531 described above.

  Then, as shown in FIG. 3, the developing device side gear 616 and the intermediate gear 614 mesh, the intermediate gear 614 and the developing roller driving gear 612 mesh, and the developing roller driving gear 612 and the supply roller driving gear 610 Meshed. Further, as shown in FIG. 12, the developing device side gear 616 meshes with a main body side gear 56 provided in the main body of the image forming apparatus.

 The main body side gear 56 applies a driving force received from a driving source (not shown) to the developing device side gear 616. The developing device side gear 616 transmits the driving force received from the main body side gear 56 to the developing roller driving gear 612 via the intermediate gear 614. The driving force transmitted to the developing roller driving gear 612 is also transmitted to the supply roller driving gear 610 by the meshing of the developing roller driving gear 612 and the supply roller driving gear 610.

  In the yellow developing device 54 configured as described above, the toner supply roller 550 rotates to supply the toner T stored in the toner storage body 538 to the developing roller 510. At this time, the toner supply roller 550 is driven to rotate by the driving force transmitted to the supply roller driving gear 610. The toner T supplied to the developing roller 510 reaches the contact position of the regulating blade 560 as the developing roller 510 rotates, and the layer thickness is regulated and electric charge is applied when passing through the contact position. Is done. The toner T on the developing roller 510 to which the layer thickness is regulated and the electric charge is applied reaches the developing position facing the photosensitive member 20 by further rotation of the developing roller 510, and the photosensitive member is subjected to an alternating electric field at the developing position. The latent image formed on 20 is subjected to development. The toner T on the developing roller 510 that has passed the developing position due to further rotation of the developing roller 510 passes through the upper seal member 520 and is collected in the developing device without being scraped off by the upper seal member 520. The developing roller 510 is driven to rotate by the driving force transmitted to the developing roller driving gear 612. Further, the toner T still remaining on the developing roller 510 can be peeled off by the toner supply roller 550.

=== Regarding Positioning of Toner Supply Roller 550 and Development Roller 510 ===
As described in the section of the problem to be solved by the invention, the toner supply roller 550 and the development roller 510 have the function of supplying the toner T to the development roller 510 appropriately. Must be accurately positioned. Here, how the toner supply roller 550 and the developing roller 510 are positioned in the developing device according to the present embodiment will be described.

 As described above, the toner supply roller 550 is attached to the housing 540. More specifically, the housing 540 has one end side supply roller fitting hole 546a into which the one end side supply roller bearing 578a can be fitted as a supply roller fitting hole 546 into which the supply roller bearing 578 can be fitted. , The other end side supply roller fitting hole 546b into which the other end side supply roller bearing 578b can be fitted, and the toner supply roller 550 is fitted into the one end side supply roller fitting hole 546a. The other end side supply roller bearing 578b fitted in the other end side supply roller fitting hole 546b is rotatably supported by the housing 540. As a result, the toner supply roller 550 is positioned with respect to the housing 540.

 On the other hand, the developing roller 510 is attached to the assembly member 525. More specifically, as the developing roller fitting hole 530 into which the developing roller bearing 576 can be fitted into the assembly member 525, the one end side developing roller fitting hole 530a into which the one end side developing roller bearing 576a can be fitted. And the other end side developing roller fitting hole 530b into which the other end side developing roller bearing 576b can be fitted. The developing roller 510 is fitted into the one end side developing roller fitting hole 530a. One end side developing roller bearing 576a and the other end side developing roller bearing 576b fitted in the other end side developing roller fitting hole 530b are rotatably supported by the assembly member 525. As a result, the developing roller 510 is positioned with respect to the assembly member 525.

 One end side supply roller of the housing 540 in which the toner supply roller 550 is positioned in the supply roller fitting hole 586 of the assembly member 525 in which the development roller 510 is positioned on one end side in the longitudinal direction of the yellow developing device 54. One end side supply roller bearing 578a fitted in the fitting hole 546a is fitted. A pin 544 a provided in the housing 540 is fitted in the pin fitting hole 588 of the assembly member 525.

 As a result, the relative position between the assembly member 525 where the developing roller 510 is positioned and the housing 540 where the toner supply roller 550 is positioned is positioned. As a result, the relative position between the toner supply roller 550 and the developing roller 510 is positioned. The Rukoto.

 On the other end side in the longitudinal direction of the yellow developing device 54, as shown in FIGS. 13 and 14, the relative positions of the other end side developing roller bearing 576b and the other end side supply roller bearing 578b are positioned. A bracket 630 as an example of a positioning member for this purpose is provided. As shown in FIG. 15, the bracket 630 includes a first recess 630a in which the other end side developing roller bearing 576b can be fitted, a second recess 630b in which the other end side supply roller bearing 578b can be fitted, The other end side developing roller bearing 576b is fitted in the first recess 630a, and the other end side supply roller bearing 578b is fitted in the second recess 630b, whereby the other end side developing roller bearing 576b is fitted. And the other end side supply roller bearing 578b are positioned relative to each other. As a result, the relative positions of the toner supply roller 550 and the developing roller 510 are more reliably positioned.

=== Effectiveness of Developing Device According to the Present Embodiment ===
As described above, the developing device according to the present embodiment includes the developing roller 510 for carrying the toner T, the assembling member 525 to which the developing roller 510 is attached, and the toner T for supplying the developing roller 510 with the toner T. A toner supply roller 550, a housing 540 to which the toner supply roller 550 is attached, a relative position of the assembly member 525 and the housing 540, and a supply roller bearing 578 (for receiving the shaft of the toner supply roller 550) That is, it has a bearing 578a) for one end side supply roller. Thus, it is possible to realize a developing device in which the toner supply roller 550 and the developing roller 510 are positioned with high accuracy with a simple configuration.

 That is, as described in the section of the problem to be solved by the invention, the toner supply roller 550 and the developer are used in order to appropriately perform the function of the toner supply roller 550 to supply the toner T to the developing roller 510. The roller 510 needs to be accurately positioned. Furthermore, it is desirable that such positioning be realized with a simple configuration.

  In the developing device according to the present embodiment, the supply roller bearing 578 for receiving the shaft of the toner supply roller 550 positions the relative position of the assembly member 525 and the housing 540, and therefore is not related to the toner supply roller 550. Compared to the case where the member positions the relative position, the relative position of the toner supply roller 550 with respect to the developing roller 510 provided on the assembly member 525 is positioned with higher accuracy.

 Further, since the supply roller bearing 578 for receiving the shaft of the toner supply roller 550 also has a function of positioning the relative position of the assembly member 525 and the housing 540, a member specialized for positioning the relative position is used. Installation can be omitted. As a result, highly accurate positioning of the toner supply roller 550 and the developing roller 510 is realized with a simple configuration.

  As described above, according to the above-described embodiment, it is possible to realize a developing device in which the toner supply roller 550 and the developing roller 510 are accurately positioned with a simple configuration.

=== Other Embodiments ===
The developing device and the like according to the present invention have been described above based on the above embodiment. However, the above-described embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. Absent. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.

  In the above embodiment, an intermediate transfer type full color laser beam printer has been described as an example of the image forming apparatus. However, the present invention is not limited to the intermediate transfer type, such as a full color laser beam printer, a monochrome laser beam printer, a copying machine, and a facsimile. The present invention can be applied to various image forming apparatuses.

  Also, the photosensitive member is not limited to a so-called photosensitive roller, which is configured by providing a photosensitive layer on the outer peripheral surface of a cylindrical conductive substrate, and is configured by providing a photosensitive layer on the surface of a belt-shaped conductive substrate. A so-called photosensitive belt may be used.

  Moreover, in the said embodiment, although the assembly | attachment member 525 was comprised from two members, ie, the holder 526, and the side plate 580, it is not limited to this, It is one member. It is good.

  Further, in the above embodiment, the assembly member 525 and the housing 540 have the supply roller fitting hole 586 and the supply roller fitting hole 546 into which the supply roller bearing 578 can be fitted, respectively. The feed roller bearing 578 is rotatably supported by the housing 540 via the feed roller bearing 578 fitted in the feed roller fitting hole 546, and is fitted in the feed roller fitting hole 546. However, although the relative position of the assembly member 525 and the housing 540 is determined by being fitted in the supply roller fitting hole 586, the present invention is not limited to this. For example, a part of the housing may have a function of a supply roller bearing.

  In the above embodiment, the developing roller bearing 576 for receiving the shaft 510a of the developing roller 510 is provided, and the assembly member 525 has the developing roller fitting hole 530 into which the developing roller bearing 576 can be fitted. The developing roller 510 is rotatably supported by the assembly member 525 via the developing roller bearing 576 fitted in the developing roller fitting hole 530, but is not limited thereto. It is not a thing. For example, a part of the assembly member may have the function of a developing roller bearing.

  In the above embodiment, the supply roller bearing 578 is positioned at one end side supply roller bearing 578a located at one end in the longitudinal direction of the yellow developing device 54 and at the other end side in the longitudinal direction of the yellow developing device 54. The other end side supply roller bearing 578b, and the housing 540 has, as the supply roller fitting hole 546, one end side supply roller fitting hole 546a into which the one end side supply roller bearing 578a can be fitted, and the like. The other end side supply roller fitting hole 546b into which the end side supply roller bearing 578b can be fitted, and the toner supply roller 550 is fitted in the one end side supply roller fitting hole 546a. By means of the housing 540 via the roller bearing 578a and the other end side supply roller bearing 578b fitted in the other end side supply roller fitting hole 546b. The developing roller bearing 576 is positioned at one end side in the longitudinal direction of the yellow developing device 54 and positioned at the other end side in the longitudinal direction of the yellow developing device 54. The other end side developing roller bearing 576b, and the assembly member 525, as the developing roller fitting hole 530, has one end side developing roller fitting hole 530a into which the one end side developing roller bearing 576a can be fitted, The other end side developing roller fitting hole 530b into which the other end side developing roller bearing 576b can be fitted, and the developing roller 510 is fitted into the one end side developing roller fitting hole 530a. By the assembly member 525 via the roller bearing 576a and the other end side developing roller bearing 576b fitted in the other end side developing roller fitting hole 530b. The assembly member 525 has a supply roller fitting hole 586 into which the one end side supply roller bearing 578a can be fitted only on one end side in the longitudinal direction of the yellow developing device 54, and is supplied on one end side. The one end side supply roller bearing 578a fitted in the roller fitting hole 546a is fitted in the supply roller fitting hole 586, so that the relative position between the assembly member 525 and the housing 540 is determined. However, the present invention is not limited to this. For example, the assembly member has a supply roller fitting hole into which a supply roller bearing can be fitted on both one end side in the longitudinal direction and the other end side in the longitudinal direction of the yellow developing device. The relative position of the assembly member and the housing may be positioned by fitting into the supply roller fitting hole at one end in the direction and the other end in the longitudinal direction.

In the above embodiment, on one end in the longitudinal direction of the yellow developing device 54, the pin 544a can be fitted to one of the assembly member 525 and the housing 540, and the pin 544a can be fitted to the other. However, the pin 544a is fitted in the pin fitting hole 588. However, the present invention is not limited to this, and the pin and the fitting hole may not be provided.
However, the above embodiment is more preferable in that the positioning of the assembly member 525 and the housing 540 is more reliable.

In the above embodiment, the other end of the yellow developing device 54 in the longitudinal direction has a bracket 630 for positioning the relative position of the other end side supply roller bearing 578b and the other end side developing roller bearing 576b. However, the present invention is not limited to this. For example, the bracket 630 may not be provided.
However, the above embodiment is more preferable in that the relative positioning of the toner supply roller 550 and the developing roller 510 is more reliable.

=== Configuration of Image Forming System etc. ===
Next, an image forming system according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 16 is an explanatory diagram showing an external configuration of the image forming system. The image forming system 700 includes a computer 702, a display device 704, a printer 706, an input device 708, and a reading device 710. In this embodiment, the computer 702 is housed in a mini-tower type housing, but is not limited thereto. The display device 704 is generally a CRT (Cathode Ray Tube), a plasma display, a liquid crystal display device, or the like, but is not limited thereto. As the printer 706, the printer described above is used. In this embodiment, the input device 708 uses a keyboard 708A and a mouse 708B, but is not limited thereto. In this embodiment, the reading device 710 uses a flexible disk drive device 710A and a CD-ROM drive device 710B. However, the reading device 710 is not limited to this. For example, an MO (Magneto Optical) disk drive device or a DVD (Digital Versatile) is used. Disk) etc. may be used.

  FIG. 17 is a block diagram showing a configuration of the image forming system shown in FIG. An internal memory 802 such as a RAM and an external memory such as a hard disk drive unit 804 are further provided in a housing in which the computer 702 is housed.

  In the above description, the example in which the printer 706 is connected to the computer 702, the display device 704, the input device 708, and the reading device 710 to configure the image forming system has been described. However, the present invention is not limited to this. Absent. For example, the image forming system may include a computer 702 and a printer 706, and the image forming system may not include any of the display device 704, the input device 708, and the reading device 710.

  For example, the printer 706 may have a part of the functions or mechanisms of the computer 702, the display device 704, the input device 708, and the reading device 710. As an example, the printer 706 includes an image processing unit that performs image processing, a display unit that performs various displays, a recording medium attachment / detachment unit for attaching / detaching a recording medium that records image data captured by a digital camera or the like. It is good also as a structure to have.

  The image forming system realized in this way is a system superior to the conventional system as a whole system.

FIG. 2 is a diagram illustrating main components constituting the printer. FIG. 2 is a block diagram illustrating a control unit of the printer 10 in FIG. 1. It is a perspective view of a developing device. It is sectional drawing which showed the main components of the image development apparatus. FIG. 6 is a perspective view showing a state where a toner supply roller 550 is attached to a housing 540. FIG. 8 is a perspective view illustrating a state in which a developing roller 510 is attached to the holder 526 illustrated in FIG. 7. FIG. 5 is a perspective view showing a state in which an upper seal member 520 and a regulating blade 560 are assembled to a holder 526. It is a perspective view of the side plate 580. FIG. 6 is a perspective view showing a state in which an upper seal member 520, a regulating blade 560, and a developing roller 510 are assembled to the assembly member 525. FIG. 10 is a perspective view illustrating a state in which the assembly member 525 illustrated in FIG. 9 is attached to the housing 540 illustrated in FIG. 5. FIG. 11 is a perspective reference diagram illustrating a state in which the side plate 580 is removed from the assembly member 525 illustrated in FIG. 10. FIG. 4 is a perspective view showing a state in which a yellow developing device is mounted on a holding portion 55d of a YMCK developing unit 50. 6 is a perspective view showing a state in which a bracket 630 is provided on the other end side in the longitudinal direction of the yellow developing device 54. FIG. FIG. 10 is a perspective reference view showing a state of the other end side in the longitudinal direction of the yellow developing device before the bracket 630 is provided. 6 is a perspective view showing the back side of a bracket 630. FIG. 1 is an explanatory diagram showing an external configuration of an image forming system. It is a block diagram which shows the structure of the image forming system shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Laser beam printer 20 Photoconductor 30 Charging unit 40 Exposure unit 50 YMCK developing unit 50a Central axis 51 Black developing device 52 Magenta developing device 53 Cyan developing device 54 Yellow developing device 55a, 55b, 55c, 55d Holding unit 56 Main body side gear 58 Positioning pin fitting hole 60 Primary transfer unit 70 Intermediate transfer body 75 Cleaning unit 76 Cleaning blade 80 Secondary transfer unit 90 Fixing unit 92 Paper feed tray 94 Paper feed roller 95 Display unit 96 Registration roller 100 Control unit 101 Main controller 102 Unit controller 112 Interface 113 Image memory 510 Developing roller 510a Shaft 510b Large diameter portion 520 Upper seal member 520a Short side end portion 520b Contact surface 520c Opposite surface 524 Upper seal biasing member 525 Assembly member 526 Holder 527 Upper seal support portion 528 Regulating blade support portion 529 Developing roller support portion 529a One end side developing roller support portion 529b Other end side developing roller support portion 530 Developing roller fitting Joint hole 530a One end side developing roller fitting hole 530b The other end side developing roller fitting hole 531 Intermediate gear support portion 538 Toner container 538a First toner containing portion 538b Second toner containing portion 540 Housing 542 Upper housing portion 543 Lower housing portion 544 Side wall 544a Pin 545 Partition wall 546 Supply roller fitting hole 546a One end side supply roller fitting hole 546b Other end side supply roller fitting hole 550 Toner supply roller 560 Restriction blade 560a Rubber part 560b Rubber support part 560c Short side End portion 560d Longitudinal end portion 572 Opening 574 End portion seal 576 Developing roller bearing 576a One end side developing roller bearing 576b Other end side developing roller bearing 578 Supply roller bearing 578a One end side supplying roller bearing 578b Other end side supply Roller bearing 580 Side plate 582 Support portion fitting hole 584 Development roller fitting hole 586 Supply roller fitting hole 588 Pin fitting hole 590 Development device side gear support portion 592 Positioning pin 602 Housing seal 610 Supply roller drive gear 612 Development roller drive Gear 614 Intermediate gear 616 Developing device side gear 630 Bracket 630a First recess 630b Second recess 700 Image forming system 702 Computer 704 Display device 706 Printer 708 Input device 708A Keyboard 708B Mouse 710 Reading device 710A Flexible disk drive device 710B CD-ROM drive device 802 Internal memory 804 Hard disk drive unit T Toner

Claims (3)

A developer carrying roller for carrying the developer;
A first attachment member to which the developer carrying roller is attached;
A developer supply roller for supplying a developer to the developer carrying roller;
A developing device having a second attachment member to which the developer supply roller is attached ,
One end side bearing positioned on one end side in the longitudinal direction of the developing device for positioning the relative position of the first mounting member and the second mounting member and receiving the shaft of the developer supply roller; and the development An other end side bearing located on the other end side in the longitudinal direction of the developing device for receiving the axis of the agent supply roller ,
The first mounting member has a first fitting hole into which the one end side bearing can be fitted,
The second mounting member has one end side second fitting hole into which the one end side bearing can be fitted, and the other end side second fitting hole into which the other end side bearing can be fitted,
The developer supplying roller, through said other end bearing which is fitted to the one end bearing and front SL other end the second fitting hole fitted on said one end side second fitting hole And is rotatably supported by the second mounting member,
When the one end side bearing fitted into the one end side second fitting hole is fitted into the first fitting hole, the relative positions of the first mounting member and the second mounting member are positioned. and,
One end-side second bearing located on one end in the longitudinal direction of the developing device for receiving the shaft of the developer carrying roller, and the other longitudinal end of the developing device for receiving the shaft of the developer carrying roller The other end side second bearing located on the side ,
The first mounting member is composed of a holder and a side plate that is located on one end side in the longitudinal direction of the holder and has the first fitting hole.
The holder, with the end side second bearing can fit a one side first developing roller fitting hole, the other end second bearing to be fitted to the other end side first developing roller fitting hole, Have
The side plate has a second developing roller fitting hole into which the one end side second bearing can be fitted,
The developer carrying roller is fitted to the one end side first developing roller fitting hole and the second developing roller fitting hole, and the one end side second bearing and the other end side first developing roller fitting hole. Via the second bearing on the other end side that is fitted to the first mounting member, and is rotatably supported by the first mounting member,
On one end side in the longitudinal direction of the developing device, a pin is provided in one of the first attachment member and the second attachment member, and a fourth fitting hole into which the pin can be fitted is provided in the other. The pin is fitted in the fourth fitting hole;
A positioning pin for positioning the developing device on the side plate is provided,
A positioning member for positioning a relative position of the other end side bearing and the other end side second bearing on the other end side in the longitudinal direction of the developing device;
The developing device according to claim 1, wherein the holder and the side plate constituting the first mounting member are made of metal, and the second mounting member is made of resin. A developer carrying roller for carrying the developer;
A first attachment member to which the developer carrying roller is attached;
A developer supply roller for supplying a developer to the developer carrying roller;
A developing device having a second attachment member to which the developer supply roller is attached ,
One end side bearing positioned on one end side in the longitudinal direction of the developing device for positioning the relative position of the first mounting member and the second mounting member and receiving the shaft of the developer supply roller; and the development An other end side bearing located on the other end side in the longitudinal direction of the developing device for receiving the axis of the agent supply roller ,
The first mounting member has a first fitting hole into which the one end side bearing can be fitted,
The second mounting member has one end side second fitting hole into which the one end side bearing can be fitted, and the other end side second fitting hole into which the other end side bearing can be fitted,
The developer supplying roller, through said other end bearing which is fitted to the one end bearing and front SL other end the second fitting hole fitted on said one end side second fitting hole And is rotatably supported by the second mounting member,
When the one end side bearing fitted into the one end side second fitting hole is fitted into the first fitting hole, the relative positions of the first mounting member and the second mounting member are positioned. and,
One end-side second bearing located on one end in the longitudinal direction of the developing device for receiving the shaft of the developer carrying roller, and the other longitudinal end of the developing device for receiving the shaft of the developer carrying roller The other end side second bearing located on the side ,
The first mounting member is composed of a holder and a side plate that is located on one end side in the longitudinal direction of the holder and has the first fitting hole.
The holder, with the end side second bearing can fit a one side first developing roller fitting hole, the other end second bearing to be fitted to the other end side first developing roller fitting hole, Have
The side plate has a second developing roller fitting hole into which the one end side second bearing can be fitted,
The developer carrying roller is fitted to the one end side first developing roller fitting hole and the second developing roller fitting hole, and the one end side second bearing and the other end side first developing roller fitting hole. Via the second bearing on the other end side that is fitted to the first mounting member, and is rotatably supported by the first mounting member,
On one end side in the longitudinal direction of the developing device, a pin is provided in one of the first attachment member and the second attachment member, and a fourth fitting hole into which the pin can be fitted is provided in the other. The pin is fitted in the fourth fitting hole;
A positioning pin for positioning the developing device on the side plate is provided,
A positioning member for positioning a relative position of the other end side bearing and the other end side second bearing on the other end side in the longitudinal direction of the developing device;
The holder and the side plate constituting the first mounting member are made of metal, and the second mounting member is made of resin, and a plurality of developing devices,
A photoconductor for carrying a latent image;
A rotating body that selectively rotates each of the plurality of developing devices to face the photoconductor by rotating in a state of holding the plurality of developing devices;
An image forming apparatus comprising: Computer and
An image forming apparatus connectable to the computer, comprising a developer carrying roller for carrying a developer, a first attachment member to which the developer carrying roller is attached, and a developer on the developer carrying roller. A developing device having a developer supply roller for supplying and a second attachment member to which the developer supply roller is attached , wherein the relative positions of the first attachment member and the second attachment member are positioned. And one end side bearing located on one end side in the longitudinal direction of the developing device for receiving the shaft of the developer supply roller, and the longitudinal direction of the developing device for receiving the shaft of the developer supplying roller. A second end bearing located on the end side , the first attachment member has a first fitting hole into which the one end side bearing can be fitted, and the second attachment member is located on the one end side. bearing Has one end side second fitting Goana fittable, and a second fitting Goana the other end bearing is fittable other end, the said developer supply roller, the second fitting said one end via said other end bearing that fitted to the one end bearing and front SL other end a second fitting hole is fitted to Goana, and rotatably supported by the second mounting member And the one end side bearing fitted into the one end side second fitting hole is fitted into the first fitting hole, whereby the relative position between the first attachment member and the second attachment member. There are positioned, said for receiving the shaft of the developer bearing roller and one end side second bearing positioned in the longitudinal direction one end side of the developing device, for receiving the shaft of the developer carrier roller, developing has a second end a second bearing positioned in the longitudinal direction other end side of the device, the said first attachment member , Holder and a side plate having the first fitting hole located in the longitudinal direction one end side of the holder are composed of, the holder, the end second bearing capable mating side of the one end side first A developing roller fitting hole and a second developing roller fitting hole on the other end side into which the other end side second bearing can be fitted, and the side plate can be fitted on the one end side second bearing. has a second developing roller fitting hole, said developer carrying roller, said one end side second bearing fitted in the one end side first developing roller fitting hole and the second developing roller fitting hole One end in the longitudinal direction of the developing device is rotatably supported by the first mounting member via the second bearing on the other end side that is fitted in the first developing roller fitting hole on the other end side. On the side, a pin on one of the first mounting member and the second mounting member However, a fourth fitting hole into which the pin can be fitted is provided on the other side, the pin is fitted into the fourth fitting hole, and the developing device is positioned on the side plate . A positioning pin, and a positioning member for positioning a relative position of the other end side bearing and the other end side second bearing on the other end side in the longitudinal direction of the developing device; The holder and the side plate constituting the attachment member are made of metal, and the second attachment member is made of resin, holds a photosensitive member for carrying a latent image, and holds the plurality of development devices. An image forming apparatus comprising: a rotating body that selectively rotates each of the plurality of developing devices to face the photoconductor by rotating in a state
An image forming system comprising:

Images