JP2003122121A - Developing device, process cartridge and image forming device - Google Patents

Abstract

(57) Abstract: The present invention suppresses deterioration of toner and increase in torque of a developing device even when a sponge of a toner supply roller becomes clogged with toner due to aging, thereby improving toner supply property and image quality. An object of the present invention is to provide a developing device, a process cartridge, and an image forming apparatus that can realize stabilization. A representative configuration of a developing device, a process cartridge, and an image forming apparatus according to the present invention includes a developing roller 40 for developing an electrostatic latent image formed on a photosensitive drum 1, and a core metal part 43a. And a sponge portion 43b, which is in contact with the developing roller 40 to supply the developer and a toner supply roller 43, and which contacts the developing roller 40 to form the developer on the developing roller 40 into a thin layer. In a developing device 4 having a blade 44, a developing roller 40, a toner supply roller 43, and a toner container 41 holding a developer and holding the developing blade 44, the developing roller 40 and the toner supply roller 43 are connected to the toner supply roller. It is characterized by being pressed and contacted by a pressure spring 73.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device, a process cartridge, and an image forming apparatus using the same, which are used in a copying machine, a printer and the like adopting an electrophotographic system.

[0002]

2. Description of the Related Art In image forming apparatuses such as copiers, printers, and facsimiles, an electrostatic latent image formed on an image bearing member such as an electrophotographic photosensitive member is visualized as a toner image by developing the electrostatic latent image. ing.

As one of such developing devices, a dry one-component developing device using a one-component developer (toner) has been proposed and put into practical use. In these developing devices, forming a uniform thin toner layer on the developer carrying member (developing roller) leads to improvement in image quality. Particularly in a one-component developing device using non-magnetic toner, a developer regulating member such as a developing blade is brought into contact with the developing roller to regulate the thin layer, and a sponge layer is provided as a developer supplying means to the developing roller. It is common to use a supply roller.

However, when a sponge roller is used as the developer supplying means to the developing roller, the sponge cell may be clogged with toner over time. ,
Repulsive force of sponge reaches several times. As a result, the mechanical shearing force that the toner receives in the nip between the sponge roller and the developing roller is increased, and the deterioration of the toner is accelerated, so that the toner cannot obtain a predetermined charge and the image quality deteriorates. There is a possibility that the load on the developing roller and the supply roller becomes large and the torque of the developing device becomes large.

As a means for preventing this, conventionally, for example, a method of forming a sponge roller of a supply roller with two layers as disclosed in JP-A-07-36273, and JP-A-11-109.
No. 743, a method of using a single-foam sponge material for the inner layer of a two-layer sponge has been devised.

[0006]

However, the above-mentioned two-layer supply roller has a complicated manufacturing process, and when the diameter of the supply roller is reduced, the thickness of each layer becomes thin, and defects such as foaming occur. Problems such as easy to occur are likely to occur. Also, as long as the continuous foam sponge material is used,
Since invasion of the toner into the cells of the sponge is unavoidable, there was a problem that it was difficult to maintain the softness of the sponge portion unless a sufficient thickness of the single-foam sponge layer was secured. .

Therefore, according to the present invention, even if the sponge of the toner supply roller is hardened due to the toner clogging due to aging, deterioration of the toner and an increase in the torque of the developing device can be suppressed, and the toner supply performance and the image quality can be stabilized. An object of the present invention is to provide a developing device, a process cartridge, and an image forming apparatus.

[0008]

In order to solve the above-mentioned problems, a developing device, a process cartridge and an image forming apparatus according to the present invention have a typical structure in which an electrostatic latent image formed on an electrophotographic photosensitive member is developed. A developer carrying member, a core metal part and a sponge part, a developer supplying member for contacting the developer carrying member to supply the developer, and abutting on the developer carrying member. A developer control member for forming the developer on the developer carrier in a thin layer, and a developer container for holding the developer carrier, the developer supply member and the developer control member, and containing the developer. In the developing device having the above, the developer carrying member and the developer supplying member are in pressure contact with each other by an urging member.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of a developing device, a process cartridge and an image forming apparatus according to the present invention will be described with reference to the drawings. 1 is a sectional view of a multicolor image forming apparatus according to the present embodiment, FIG. 2 is a sectional view of a process cartridge, FIG. 3 is a perspective view of a process cartridge, and FIG. 4 is a side view showing a developing bearing portion of a developing device.
5 is an exploded perspective view showing the structure of the toner supply roller of the developing device, FIG. 6 is a side view of the developing device, FIG. 7 is a side view showing the developing bearing of the developing device, and FIG. 8 is a side view showing the developing bearing of the developing device. It is a figure.

[Overall Configuration of Multicolor Image Forming Apparatus] First, the overall configuration of the multicolor image forming apparatus will be outlined.

As shown in FIG. 1, a multicolor image forming apparatus 100 is provided.
Is provided with four photoconductor drums 1a, 1b, 1c, and 1d, which are electrophotographic photoconductors arranged in a vertical direction. The photosensitive drum 1 is rotationally driven counterclockwise in the figure by a driving unit (not shown). Around the photosensitive drum 1, charging devices 2 (2a, 2b, 2c, 2) that uniformly charge the surface of the photosensitive drum 1 in order according to the rotation direction thereof.
d), a scanner unit 3 which irradiates a laser beam on the basis of image information to form an electrostatic latent image on the photosensitive drum 1.
(3a, 3b, 3c, 3d), a developing device 4 (4a, 4) that develops a toner image by attaching toner to the electrostatic latent image.
b, 4c, 4d), an electrostatic transfer device 5 that transfers the toner image on the photosensitive drum 1 to the transfer material S, and a cleaning device 6 (6a) that removes transfer residual toner remaining on the surface of the photosensitive drum 1 after transfer. , 6b, 6c, 6d) and the like are provided.

Here, the photosensitive drum 1, the charging device 2, the developing device 4 and the cleaning device 6 are integrally formed into a cartridge to form a process cartridge 7.

The photosensitive drums 1 will be described in detail below.

The photoconductor drum 1 is constituted by coating an organic photoconductor layer (OPC photoconductor) on the outer peripheral surface of an aluminum cylinder having a diameter of 30 mm, for example. Photoconductor drum 1
Has both ends rotatably supported by support members, and is driven to rotate counterclockwise by transmitting a driving force from a drive motor (not shown) to one end.

As the charging device 2, a contact charging type device can be used. The charging member is a conductive roller formed in the shape of a roller. The roller is brought into contact with the surface of the photosensitive drum 1 and a charging bias voltage is applied to the roller to make the surface of the photosensitive drum 1 uniform. It is to be charged.

The scanner unit 3 is arranged substantially in the horizontal direction of the photosensitive drum 1 and has a laser diode (not shown).
The image light corresponding to the image signal is rotated at a high speed by a scanner motor (not shown) by the polygon mirror 9
(9a, 9b, 9c, 9d) is irradiated. The image light reflected by the polygon mirror 9 is formed by the imaging lens 10 (10a, 10a).
b, 10c, 10d), the surface of the charged photosensitive drum 1 is selectively exposed to form an electrostatic latent image.

The developing device 4 is a toner container 41 (41a, 41b, 41c, 41d), which is a developing container accommodating toners of yellow, magenta, cyan, and black, respectively.
The toner feeding mechanism 42 is configured to feed the toner in the toner container 41 to a toner feeding roller 43 which is a developer feeding member.
Toner supply roller that feeds to and rotates clockwise in the figure
The toner is applied to the outer circumference of the developing roller 40, which rotates clockwise in the drawing, by the developing blade 44, which is a developer regulating member, which is pressed against the outer circumference of the developing roller 40, which is a developer carrier, and the toner is charged. To do.

By applying a developing bias to the developing roller 40 facing the photosensitive drum 1 on which the latent image is formed, toner development is performed on the photosensitive drum 1 according to the latent image.

All the photosensitive drums 1a, 1b, 1c,
An electrostatic transfer belt 11 is disposed so as to face 1d and to circulate so as to come into contact therewith. Electrostatic transfer belt 11 is 1011-1014Ω
It is composed of a film-like member having a volume resistivity of cm and a thickness of about 150 μm. The electrostatic transfer belt 11 is supported by rollers on four axes in the vertical direction, electrostatically adsorbs the transfer material S on the outer peripheral surface on the left side in the drawing, and transfers the transfer material S to the photosensitive drum 1.
Circularly move to contact. As a result, the transfer material S
Is conveyed to the transfer position by the electrostatic transfer belt 11, and the toner image on the photosensitive drum 1 is transferred.

The inner surface of the electrostatic transfer belt 11 is abutted and
Transfer rollers 12 (12a, 12b, 12c, 12d) are arranged in parallel at positions facing the respective photosensitive drums 1a, 1b, 1c, 1d. A positive charge is applied from the transfer roller 12 to the transfer material S through the electrostatic transfer belt 11, and an electric field generated by the charge causes a negative charge on the photosensitive drum 1 on a sheet in contact with the photosensitive drum 1. Toner image is transferred.

The electrostatic transfer belt 11 is a belt having a peripheral length of about 700 mm and a thickness of 150 μm, which is wound around four rollers of a driving roller 13, driven rollers 14a and 14b, and a tension roller 15 and rotated in the direction of the arrow in the figure. To do. This allows
The toner image is transferred while the above-described electrostatic transfer belt 11 circulates and the transfer material S is conveyed from the driven roller 14a side to the drive roller 13 side.

The feeding unit 16 feeds and conveys the transfer material S to the image forming unit, and a plurality of transfer materials S are fed to the feeding cassette.
It is stored in 17. At the time of image formation, the feeding roller 18 (half-moon roller) and the registration roller pair 19 are driven and rotated in accordance with the image forming operation to separate and feed the transfer materials S in the feeding cassette 17 one by one, and at the end of the transfer material S. Is a pair of registration rollers
After stopping at 19 and temporarily forming a loop, the rotation of the electrostatic transfer belt 11 and the image writing position are synchronized with each other, and the registration roller pair 19 feeds the electrostatic transfer belt 11.

The fixing section 20 is for fixing the toner images of a plurality of colors transferred onto the transfer material S, and includes a rotating heating roller 21a and a pressurizing member for pressing the transfer material S with heat and pressure. It consists of a roller 21b.

That is, the transfer material S onto which the toner image on the photosensitive drum 1 is transferred is conveyed by the fixing roller pair 21 when passing through the fixing section 20, and is given heat and pressure by the fixing roller pair 21. As a result, the toner images of a plurality of colors are fixed on the surface of the transfer material S.

In the image forming operation, the process cartridges 7a, 7b, 7c and 7d are sequentially driven at the recording timing, and the photosensitive drum 1 is driven in response to the driving.
a, 1b, 1c, and 1d are rotationally driven counterclockwise. Then, the scanner unit 3 corresponding to each process cartridge 7 is sequentially driven. By this driving, the charging roller 2 applies a uniform electric charge to the peripheral surface of the photoconductor drum 1, and the scanner unit 3 moves to the photoconductor drum 1 thereof.
The peripheral surface is exposed according to an image signal to form an electrostatic latent image on the peripheral surface of the photosensitive drum 1. Developing roller in developing device 4
40 transfers the toner to the low potential portion of the electrostatic latent image to form (develop) a toner image on the peripheral surface of the photosensitive drum 1.

At the timing when the leading edge of the toner image on the peripheral surface of the most upstream photoconductor drum 1a is rotatably conveyed to the facing point of the electrostatic transfer belt 11, the recording start position of the transfer material S is set at the facing point. The pair of registration rollers 19 starts rotating to feed the transfer material S to the electrostatic transfer belt 11 so that they coincide with each other.

The transfer material S is sandwiched between the electrostatic attraction roller 22 and the electrostatic transfer belt 11 so that the electrostatic transfer belt 11 is held.
Of the dielectric material of the transfer material S, which is a dielectric, and the dielectric layer of the electrostatic transfer belt 11 by applying a voltage between the electrostatic transfer belt 11 and the electrostatic attraction roller 22 while being pressed against the outer periphery of the electrostatic transfer belt 11. Then, the transfer material is configured to be electrostatically attracted to the outer periphery of the electrostatic transfer belt 11. As a result, the transfer material S is stably attracted to the electrostatic transfer belt 11 and is conveyed to the most downstream transfer unit.

While being conveyed in this way, the transfer material S sequentially transfers the toner images on the photosensitive drums 1 by the electric field formed between the photosensitive drums 1 and the transfer roller 12.

The transfer material S to which the four color toner images have been transferred is
The curvature is separated from the electrostatic transfer belt 11 by the curvature of the belt driving roller 13 and is carried into the fixing unit 20. The transfer material S has a pair of discharge rollers after the toner image is heat-fixed by the fixing unit 20.
By 23, the image is discharged from the discharge unit 24 to the outside of the main body with the image surface facing down.

Next, the process cartridge embodying the present invention will be described in detail. Yellow, magenta, cyan, and black process cartridges 7a, 7b, 7
c and 7d have the same structure.

As shown in FIGS. 2 and 3, the process cartridge 7 includes a drum-shaped electrophotographic photosensitive member, that is, a photosensitive drum 1, which is an image carrier, and a photosensitive drum unit 50 having a charging unit and a cleaning unit. And a developing unit 4 having developing means for developing the electrostatic latent image on the photosensitive drum 1.

In the photoconductor drum unit 50, the photoconductor drum 1 has a cleaning frame 51 via a bearing (not shown).
Is rotatably attached to. Around the circumference of the photosensitive drum 1, a primary charging means 2 for uniformly charging the surface of the photosensitive drum 1 and a cleaning blade 60 for removing the toner remaining on the photosensitive drum are arranged. Further, the residual toner removed from the surface of the photosensitive drum 1 by the cleaning blade 60 is a toner feeding mechanism.
By 52, the toner is sequentially sent to a waste toner chamber 53 provided behind the cleaning frame. By transmitting the driving force of a drive motor (not shown) to one end on the rear side in the figure, the photosensitive drum 1 is rotationally driven counterclockwise in the figure in accordance with the image forming operation.

The developing unit 4 comprises a developing roller 40 which contacts the photosensitive drum 1 and rotates in the direction of the arrow Y, a toner container 41 containing toner and a developing frame 45. The developing roller 40 is rotatably supported by the developing device frame 45 via developing bearings 47, 48, and on the circumference of the developing roller 40,
A toner supply roller 43 and a developing blade 44 which are in contact with the developing roller 40 and rotate in the arrow Z direction are arranged. Further, inside the toner container 41, a toner conveying mechanism 42 is provided for stirring the contained toner and conveying it to the toner supply roller 43.

The developing unit 4 is the developing unit 4
The developing unit 4 as a whole is swingably supported by the pin 49a around the support shafts 49 provided on the developing bearings 47 and 48 attached to both ends of the photosensitive drum unit 50. In the state in which the process cartridge 7 is alone (not mounted in the printer body), the developing roller is rotated by the rotation moment about the support shaft 49.
The developing unit 4 is constantly urged by the pressure spring 54 so that 40 contacts the photosensitive drum 1. Further, the toner container 41 of the developing unit 4 is integrally provided with a rib 46 for contacting the separating means of the printer body 100 when the developing roller 40 is separated from the photosensitive drum 1.

At the time of development, when the toner contained in the toner conveying mechanism 42 is conveyed to the toner supply roller 43, the toner supply roller 43 rotating in the arrow Z direction rotates the toner in the arrow Y direction. It is supplied to the developing roller 40 by rubbing against and is carried on the developing roller 40. The toner carried on the developing roller 40 reaches the developing blade 44 as the developing roller 40 rotates, and the developing blade 44 gives an electric charge to the toner and forms a predetermined toner thin layer. Then, the photoconductor drum 1 and the developing roller 40 are conveyed to a developing unit in contact with each other, and are formed on the surface of the photoconductor drum 1 by a DC developing bias applied to the developing roller 40 from a power source (not shown) in the developing unit. It adheres to the electrostatic latent image and develops the latent image. The toner remaining on the surface of the developing roller 40 without contributing to the development is returned to the inside of the developing device as the developing roller 40 rotates, and is separated and collected from the developing roller 40 at the sliding portion with the toner supply roller 43. . The collected toner is agitated and mixed with the remaining toner by the toner conveying mechanism 42.

In the contact developing system in which the photosensitive drum 1 and the developing roller 40 are brought into contact with each other to develop as in the present invention, the photosensitive drum 1 is a rigid body and the developing roller used for this is used.
40 is preferably a roller having an elastic body. As the elastic body, a solid rubber single layer or a solid rubber layer coated with a resin in consideration of charge imparting property to toner is used.

The toner supply roller 43 is an elastic roller composed of a cored bar portion 43a and a sponge portion 43b.
43b uses a continuous foam sponge.

Next, the structure of the toner supply roller 43 of the developing unit 4 embodying the present invention will be described in detail with reference to FIGS.

As shown in FIGS. 4 and 5, the toner supply roller 43 is supported by the developing roller bearings 72, which are holding members, and the developing roller bearings 47, 48, which are holding side plates, with respect to the developing roller 40. Have an intrusion amount.

As shown in FIG. 6, the drive train for transmitting the drive force to the developing roller 40 and the toner supply roller 43 is a developing bearing.
Held at 47. First, it is transmitted from the drive train of the image forming apparatus main body (not shown) into the developing unit 4 via the drive input gear 71c. Then, after passing through the idler gear 71e,
The idler gear 71d branches into a developing roller gear 71a and a toner supply roller gear 71b.

The toner supply roller gear 71b is a driven-side transmission member that is non-rotatably attached to the toner supply roller 43, and transmits the driving force by the drive-side transmission member such as the drive input gear 71c, the idler gear 71e, and the idler gear 71d. To be done.

The developing bearings 47, 48 (see FIG. 8) are guide portions 47c, 48c for movably supporting the toner supply roller bearing 72.
(See FIG. 8). Toner supply roller core 43
The toner supply roller bearing 72 that rotatably supports a is movable along the developing bearing guide portions 47c and 48c. And
A toner supply roller pressing spring 73, which is an urging member arranged coaxially with the idler gear 71d and the idler gear bearing portion 47d, urges the developing roller 40 and the developing roller shaft portion 40a in a contacting direction.

As a result, the toner supply roller 43 has a structure in which the amount of penetration into the developing roller 40 can be varied, and even if the toner supply roller 43 becomes clogged with toner due to aging and the hardness becomes large, the toner supply roller 43 remains It is possible to reduce the contact pressure increase by moving in the direction away from the developing roller 40, suppress the progress of toner deterioration and the torque increase of the developing device, and realize the toner supply property and the image quality stabilization. .

Further, as shown in FIGS. 7 and 8, the toner supply roller bearing portions 47b and 48b, which are regulation guides through which the supply roller core metal portion 43a penetrates, do not interfere with the movement of the toner supply roller. It has a long hole shape. here,
The toner supply roller 43 is movable with respect to the developing roller 40 in the contact and separation directions. That is, the moving direction of the toner supply roller 43 is the toner supply roller bearing portion 47
b, 48b, and the supply roller guide portions 47c, 48c regulate in the circumferential direction about the idler gear 71d.

As a result, the toner supply roller pressure spring 57
Even if the toner supply roller 43 moves against the urging force of the developing roller 40 and the axial distance between the developing roller 40 and the developing roller 40 changes, the axial distance between the drive trains is kept constant. It is possible to prevent the adverse effect on the drive transmission of.

Further, the maximum value and the minimum value of the penetration amount of the toner supply roller 43 into the developing roller 40 are regulated by the long holes of the toner supply roller bearing portions 47b and 48b of the developing bearings 47 and 48. As a result, it is possible to guarantee the range of the intrusion amount in which the toner supply roller 43 functions.

Second Embodiment Next, a second embodiment of the developing device, the process cartridge and the image forming apparatus according to the present invention will be described with reference to the drawings. 9 is a side view showing the relationship between the developing roller and the toner supply roller according to the present embodiment, and FIG. 10 is a perspective view showing the relationship between the developing roller and the toner supply roller. The same parts as those of the first embodiment will be designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 9 and 10, the toner supply roller roller 74, which is a cylindrical member, is replaced by the developing roller rubber portion 40.
Both ends of b are pivotally supported by a cored bar portion 43a that overlaps the developing roller rubber portion 40b at a longitudinal position. The toner supply roller roller 74 has a diameter Dc that is larger than the diameter of the cored bar portion 43a and smaller than the diameter Db of the sponge portion 43b. As a result, the toner supply roller 43 is prevented from entering the developing roller 40 by the toner supply roller roller 74, and the maximum value of the amount of penetration δ is Db−Dc. In this way, the amount of invasion of the toner supply roller 43 into the developing roller 40 is regulated, so that the maximum intrusion amount can be guaranteed.

Further, the toner supply roller 43 is attached to the developing frame 45.
By providing a rib (not shown) that regulates the toner supply roller roller 74 when the toner is moved in the direction away from the developing roller 40, the minimum intrusion amount can be guaranteed.

[0050]

As described above, the axial distance between the toner supply roller and the developing roller is made variable, and the toner supply roller is biased against the developing roller.
Even if the sponge of the toner supply roller becomes hard due to the toner clogging due to aging, the increase in the contact pressure to the developing roller can be suppressed by increasing the distance between the shafts, which deteriorates the toner and increases the torque of the developing device. It is possible to suppress toner supply and stabilize toner supply and image quality.

Further, by making the toner supply roller movable in the circumferential direction around the idler gear that transmits the driving force to the toner supply roller, the toner is clogged on the toner supply roller and the hardness is increased. Even in such a case, since the axial distance of the drive train is kept constant, it is possible to suppress the adverse effect on the drive transmission.

Further, the maximum and minimum values of the amount of the toner supply roller invading the developing roller are restricted by the elongated holes of the developing bearing or the cylindrical member attached to the toner supply roller, so that the range of the amount of the toner supply roller operating can be controlled. It becomes possible to guarantee.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a multicolor image forming apparatus according to a first embodiment.

FIG. 2 is a sectional view of a process cartridge.

FIG. 3 is a perspective view of a process cartridge.

FIG. 4 is a side view showing a developing bearing portion of the developing device.

FIG. 5 is an exploded perspective view showing a configuration of a toner supply roller of the developing device.

FIG. 6 is a side view of the developing device.

FIG. 7 is a side view showing a developing bearing of the developing device.

FIG. 8 is a side view showing a developing bearing of the developing device.

FIG. 9 is a side view showing the relationship between the developing roller and the toner supply roller according to the second embodiment.

FIG. 10 is a perspective view showing a relationship between a developing roller and a toner supply roller.

[Explanation of symbols] S ... Transfer material 1 ... Photosensitive drum 2 ... Charging device 3 ... Scanner unit 4 ... Developer 5 ... Electrostatic transfer device 6 ... Cleaning device 7 ... Process cartridge 9 ... Polygon mirror 10… Imaging lens 11… Electrostatic transfer belt 12… Transfer roller 13… Drive roller 14a ... driven roller 14b ... driven roller 15… Tension roller 16… Feeding department 17… Feed cassette 18… Feeding roller 19… Registration roller pair 20 ... Fixing unit 21… Fixing roller pair 21a ... Heating roller 21b ... Pressure roller 23… Ejection roller pair 24… Ejector 40 ... Developing roller 40a ... Developing roller shaft 40b ... Development roller rubber part 41… Toner container 42 ... Toner transport mechanism 43… Toner supply roller 43a ... Core bar 43b ... Sponge part 44… Development blade 45 ... Development frame 46… Ribs 47… Development bearing 47b ... Toner supply roller bearing 47c ... Supply roller guide section 47d ... Idler gear bearing 48… Development bearing 49… Support shaft 49a ... pin 50 ... Photosensitive drum unit 51… Cleaning frame 52 Toner feeding mechanism 53… Waste Toner Room 54 ... Pressure spring 60… Cleaning blade 71a ... Developing roller gear 71b ... Toner supply roller gear 71c… Drive input gear 71d, 71e ... Idler gear 72… Supply roller bearing 73… Toner supply roller pressure spring 74 Toner supply roller roller 100… Multicolor image forming device

Claims (10)

[Claims] 1. A developer carrying member for developing an electrostatic latent image formed on an electrophotographic photosensitive member, a cored bar portion and a sponge portion, the developer carrying member being in contact with the developer carrying member. A developer supply member for supplying the developer, a developer regulating member that comes into contact with the developer carrier to form the developer on the developer carrier in a thin layer, the developer carrier, and the developer supply member. And a developer container that holds the developer regulating member and stores the developer, wherein the developer carrying member and the developer supply member are pressed and contact by an urging member. And developing device. 2. The urging member urges the developer supply member toward the developer carrier, and the developer supply member is movable in contact with and away from the developer carrier. The developing device according to claim 1, wherein: 3. A developing device having a driven-side transmission member non-rotatably attached to the developer supply member and a driving-side transmission member for transmitting a driving force to the driven-side transmission member, wherein the developer supply member 3. The developing device according to claim 1, wherein the developing device is movable in a circumferential direction around a rotation center of the drive-side transmission member as a swing center. 4. The developer supply member, wherein both ends of a cored bar portion are held by bearing members, and is biased by the developer carrying member via the bearing members. 4. The developing device according to any one of 3 to 3. 5. A developing device having a holding side plate that rotatably holds the developer carrying member and the drive side transmitting member, and holds the developer supplying member via the bearing member, wherein the holding side plate is 5. The developing device according to claim 1, further comprising a regulation guide that regulates a moving direction of the bearing member. 6. The developing device according to claim 1, further comprising a movement amount regulating member for regulating a maximum movement distance of the developer supplying member with respect to the developer carrying member in the contact and separation directions. apparatus. 7. The developing device according to claim 1, wherein the regulation guide also serves as the movement amount regulation member. 8. The developing device according to claim 1, wherein the movement amount regulating member is a cylindrical member rotatably arranged at both ends of a cored bar portion of the developer supplying member. 9. An electrophotographic photosensitive member, a cleaning unit that acts on the electrophotographic photosensitive member, a charging unit, and the developing device according to claim 1 as a developing unit. Process cartridge. 10. An image forming apparatus comprising the developing device or the process cartridge according to claim 1 or a detachable structure.