JPH0836343A - Electrostatic latent image developing device - Google Patents

Abstract

PURPOSE:To provide an electrostatic latent image developing device capable of prolonging the life of an image carrier by preventing the uneven wear of the image carrier rubbed with a developer regulating means. CONSTITUTION:In the electrostatic latent image developing device provided with a developer applying means 16 holding a developer on the surface in a developer holding area 34 and carrying the held developer to a developing area, to apply the developer to an electrostatic latent image formed on the image carrier 1 and an elastic biasing member 22 pressurizing the developer applying means 16 against the image carrier 1, the arrangement position and elastic biasing force of the member 22 are set so as to make the pressurizing force of the developer applying means 16 against the image carrier 1 almost uniform in an axial direction in consideration of the pressurizing force generated by driving force exerted on one end part of the means 16. Moreover, it is disposed to cross the axis lines of the means 16 and the image carrier 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic latent image developing device used for developing an electrostatic latent image into a toner image in an image forming machine such as an electrostatic copying machine or a laser printer. The present invention relates to an electrostatic latent image developing device having a developer application unit that holds a developer on a surface and conveys the developer to a developing area.

[0002]

2. Description of the Related Art As is well known, in order to develop an electrostatic latent image into a toner image in an image forming machine, a developer applying means comprising a roller or an endless belt which is rotationally driven in a predetermined direction is provided. The electrostatic latent image developing device has been widely put into practical use. The developer applying means is provided with a driven means such as a gear which is power-transmitted and connected to the drive means at one end in the axial direction, and is driven to rotate in a predetermined direction, whereby the developer holding area, the developer amount regulating area and the developing area. Can be moved in sequence. In the developer holding area, the developer supplied by an appropriate mode is held on the surface of the developer applying means. In the developer amount regulation area, the regulation device acts on the developer retained on the surface of the developer applying unit to regulate the developer retained on the surface of the developer applying unit to a required amount.
In the developing area, a developer is applied to the surface of an electrostatic latent image bearing member such as a rotating drum having an electrophotographic photosensitive member on the peripheral surface, and the electrostatic latent image formed on the surface of the image bearing member is It is developed into a toner image. In such a developing device, as shown in FIG.
As shown in, the surface of the developer applying means B is brought into pressure contact with the surface of the image bearing member C so that the developing action is performed while both surfaces rub against each other. Therefore, the developer applying means B is mounted. The spring means E is provided for pressing the developing housing D against the image carrier C. The spring means E are arranged at positions corresponding to both ends of the developer applying means B.

[0003]

However, in the developing device described above, since the developer applying means B and the image carrier C are rubbed against each other, the image carrier C is abraded, but as shown in FIG. The pressing force F1, F is applied by the spring means E, E arranged at the positions corresponding to both ends of the developer applying means B in the axial direction.
When 2 is acting, the amount of wear tends to be unevenly worn at both ends with respect to the central part, which is one of the causes for shortening the life of the image carrier. Further, when the pressing force itself by the spring means E for pressing the developing housing D having the developer applying means B mounted thereon against the image carrier C is large, the amount of wear of both ends of the developer applying means with respect to the central part. Was found to be large. Further, in the developer applying means B, a driven gear G is attached to one end portion of its rotation shaft, and the driven gear G is driven to rotate by meshing with a transmission gear H connected to the driving means. Since the pressing force F3 generated by the force acts, the pressing force of the developer applying unit B on the image carrier C is unbalanced between the one end side where the driven gear G is mounted and the other end side. When the pressing force of the developer applying unit B on the image carrier C is unbalanced, uneven wear caused on the image carrier further increases.

The present invention has been made in view of the above facts, and its main technical problem is to prevent uneven wear of the image bearing member which is rubbed by the developer regulating means and increase the life of the image bearing member. It is to provide an electrostatic latent image developing device capable of performing.

[0005]

In order to solve the above-mentioned main technical problems, according to a first aspect of the present invention, with respect to an image carrier mounted on a machine body housing and arranged on the machine body housing. A developing housing configured to be movable,
A developer which is disposed in the developing housing and holds a developer on the surface in a developer holding area and conveys the held developer to the developing area to apply the electrostatic latent image formed on the image bearing member. An applying unit, a driven unit attached to one end of the developer applying unit and drivingly connected to a driving unit, and the developing housing and the machine body housing for pressing the developer applying unit against the image carrier. In an electrostatic latent image developing device provided with an elastic biasing means disposed between the elastic biasing means, the elastic biasing means is arranged such that its position and elastic biasing force act on one end of the developer applying means. An electrostatic latent image developing device is provided, in which the pressing force generated by the developer applying means is set so as to be substantially uniform in the axial direction in consideration of the pressing force generated by the developing means. .

According to a second aspect of the present invention, a developing housing mounted on the machine housing and configured to be movable with respect to an image carrier disposed on the machine housing; A developer applying means for holding the developer on the surface of the developer holding area, transporting the held developer to the developing area, and applying the developer to the electrostatic latent image formed on the image carrier; A driven unit mounted on one end of the developer applying unit and drivingly connected to the driving unit, and disposed between the developing housing and the machine body housing to press the developer applying unit against the image carrier. In the electrostatic latent image developing device including the elastic biasing means, the developer applying means is arranged such that its axis intersects with the axis of the image carrier.
An electrostatic latent image developing device is provided.

[0007]

In the electrostatic latent image developing device of the present invention, the elastic biasing means for pressing the developer applying means toward the image carrier is:
Considering the pressing force generated by the driving force acting on one end of the developer applying means, the arrangement position and the elastic biasing force of the developer applying means make the pressing force of the developer applying means to the image carrier substantially in the axial direction. Since they are set to be even, a substantially uniform pressing force acts on the image carrier in the entire axial direction. Therefore, uneven wear of the image carrier that is rubbed by the developer applying unit is prevented.

Further, in the electrostatic latent image developing device of the present invention, since the axis of the developer applying means and the axis of the image bearing member are arranged so as to intersect with each other, the developer applying means applies the image bearing member to the image bearing member. Since the pressing force acting is substantially equal between the central portion and the both end portions of the developer applying unit, uneven wear of the image bearing member rubbed by the developer applying unit is prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the accompanying drawings which show preferred embodiments of an electrostatic latent image developing device constructed according to the present invention.

FIG. 1 shows an image generator equipped with an electrostatic latent image developing device constructed according to the present invention. The illustrated image generator includes a rotary drum 1 as an image carrier having a photosensitive layer on its peripheral surface. The rotary drum 1 is rotatably mounted in a machine housing by a rotary shaft 2. Around the rotating drum 1 which is rotated in the direction indicated by the arrow 3, a charging corona discharger 4 for sequentially charging the photosensitive layer of the rotating drum 1 to a specific polarity in the direction of rotation, and the charging corona discharger. A laser optical section 5 as an exposing means for forming an electrostatic latent image on the photosensitive layer of the rotary drum 1 which is charged with a specific polarity by an electrostatic latent image formed by the laser beam emitted from the optical section 5. An electrostatic latent image developing device 6 for developing a toner image, a transfer corona discharger 7, a peeling corona discharger 8, a cleaning device 9, and a charge eliminating lamp 10 are provided.

The developing device 6 comprises a developing housing 12 which can be made of synthetic resin. The upper end of the developing housing 12 is swingably supported by a support shaft 14 arranged in the machine housing in parallel with the rotary drum 1. In the developing housing 12, the developer applying means 16, the supplying means 18, and the regulating means 2 are provided.
0 is set. Further, although not shown, a toner cartridge containing toner is mounted above the developing housing 12.

Referring also to FIG. 2, the developer applying means 16 includes side walls 121, 1 of the developing housing 12.
It includes a rotary shaft 24 rotatably mounted between the rollers 22, and a roller 26 fixed to the rotary shaft 24. The rotating shaft 24 can be formed of a suitable metal material such as stainless steel. The roller 26 is made of a relatively soft and conductive material, for example, a conductive solid rubber such as urethane rubber. The roller 26 preferably has an Asker C hardness of about 60 to 80, and the roller 26 preferably has a volume resistance of about 10 ^{6 to} 10 ⁹ Ω · cm. The roller 26 of the developer applying means 16 is exposed through an opening formed in the developing housing 12 and faces the rotary drum 1, and its peripheral surface is pressed against the peripheral surface of the rotary drum 1 by an elastic biasing means 22 described later. The peripheral surface of the roller 26 is slightly elastically compressed in the pressure contact region. A driven gear 28 is mounted on one end of the rotary shaft 24 of the developer applying means 16, and the driven gear 28 meshes with a transmission gear 30 connected to the driving means. Therefore, the rotary shaft 24 is continuously driven to rotate in the direction indicated by the arrow 32 in FIG. 1 via the transmission gear 30 and the driven gear 28 connected to the driving means. Due to the above rotation of the rotary shaft 24, the roller 26 is also continuously driven to rotate in the direction indicated by the arrow 32.
The peripheral surface of the sheet is sequentially conveyed through the developer holding area 34, the developer regulating area 36, and the developing area 38.

In the embodiment shown in FIG. 2, the elastic biasing means 22 is located at a position corresponding to the other end of the developer applying means 16 opposite to the one end on which the driven gear 28 is mounted. A compression coil spring 221 is provided between the developing housing 12 and the machine housing 40. Due to the elastic biasing force of the compression coil spring 221, a swinging force in the direction indicated by the arrow 42 in FIG. Therefore, the peripheral surface of the developer applying means 16 mounted on the developing housing 12 is pressed against the peripheral surface of the rotary drum 1. The elastic biasing force F1 of the compression coil spring 221 forming the elastic biasing means is set to 0.5 kg in the embodiment shown in FIG.

FIG. 3 shows another embodiment of the elastic biasing means 22. The elastic biasing means 22 shown in FIG. 3 develops at a position corresponding to one end where the driven gear 28 is mounted in the developer applying means 16 and a position corresponding to the other end opposite to the one end. A compression coil spring 22 disposed between the housing 12 and the body housing 40.
2 and 223. Therefore, the developing housing 12 has an arrow 42 (see FIG. 1) about the support shaft 14 due to the elastic biasing force of the compression coil springs 222 and 223.
A turning force in the direction indicated by (1) is applied, and the peripheral surface of the developer applying means 16 mounted on the developing housing 12 is pressed against the peripheral surface of the rotary drum 1. In the embodiment shown in FIG. 3, the elastic biasing force F1 of the compression coil spring 223 constituting the elastic biasing means is set to 1.0 kg, and the elastic biasing force F2 of the compression coil spring 222 is 0.5 k.
It is set to g.

Continuing with the description with reference to FIG. 1, the supply means 18 includes a rotary shaft 42 rotatably mounted between both side walls of the developing housing 12, and an auxiliary roller fixed to the rotary shaft 42. 44 and. Auxiliary roller 44
Is preferably made of a foam such as foam silicon or foam urethane. The auxiliary roller 44 is pressed against the roller 26 of the developer applying unit 16. The hardness of the foam forming the auxiliary roller 44 is considerably smaller than the hardness of the roller 26 (for example, Asker C hardness is about 35), and by pressing the auxiliary roller 44 against the roller 26, the auxiliary roller 44 becomes 0 in the pressure contact area. It is desirable to be elastically compressed by about 0.15 to 0.25 mm. This auxiliary roller 44 is continuously driven to rotate in the direction indicated by arrow 39 in FIG.

Next, the regulating means 20 will be described. The regulating means 20 includes a blade 46 which is pressed against the peripheral surface of the roller 26 of the developer applying means 16 and a blade supporting means 48 which movably supports one surface of the blade 46 in the direction of pressing against the peripheral surface of the roller 26. And an elastic urging means 50 for pressing the surface of the blade 46 in the direction of pressing against the peripheral surface of the roller 26.

The blade 46 is made of a rigid member in the illustrated embodiment, and at least one surface thereof (that is, the surface pressed against the peripheral surface of the roller 26) extends along the peripheral surface of the roller 26 in the width direction (FIG. 1 is a plane member extending in the direction perpendicular to the paper surface of FIG. 1). The surface roughness of at least a region of the one surface of the blade 46 which is pressed against the peripheral surface of the roller 26 is sufficiently small, and the center line average roughness Ra defined in JIS B 0601 is 6.00 or less, particularly 0.20. Below, especially 0.
It is preferably 02 or less. If the surface roughness of the one side of the blade 46 becomes excessive, the thin layer surface of the developer formed on the peripheral surface of the roller 26 of the developer applying means 16 is not sufficiently flattened and becomes uneven. Tend to end up. Therefore, although the blade 46 can be formed relatively inexpensively, the surface roughness is sufficiently small,
Moreover, as a suitable rigid material having high hardness and abrasion resistance, commercially available plate glass can be cited.
The plate glass may have a thickness of about 3 mm. If it is desired to apply the required voltage to the blade 46 to control the charging characteristics of the toner, a conductive coating can be applied to one side of the sheet glass. As the plate glass having a conductive coating on one surface, a plate glass commercially available under the trade name "Nesa glass" can be conveniently used. Instead of the plate glass, the blade 46 may be made of a rigid member made of an appropriate metal plate such as stainless steel. In order to sufficiently reduce the surface roughness of one surface of the metal plate that constitutes the blade 46, one surface of the metal plate may be subjected to an appropriate surface treatment, if necessary. If desired, the blade 46 may be formed of a laminated body of a plate glass and a metal plate, and one surface of the blade 46 that is brought into pressure contact with the roller 26 of the developer applying unit 16 may be defined by the exposed surface of the plate glass. The blade 46 is
The material is not limited to the rigid member, and may be made of an elastic material such as synthetic rubber.

The blade supporting means 48 is the blade 4
6, a pair of lower support members 52 (see FIG.
Of which only one is shown) and an upper support member 54 which supports the upper edge of the blade 46. The pair of lower support members 52 are provided with notches each having a bottom surface 521. The pair of lower support members 52 are arranged in the width direction at a predetermined interval, and are fixed to a mounting portion 123 formed integrally with the developing housing 12 by fixing means such as screws. Bottom surfaces 521 of notches provided in the pair of lower support members 52 fixed to the mounting portion 123
The lower end surfaces of both ends of the blade 46 are placed and supported on the upper side. The upper support member 54 is disposed above the lower support members 52, 52 with a predetermined space therebetween, and is provided with the developing housing 12
It is fixed to the mounting portion 123 by a plurality of screws 58. The upper support member 54 has substantially the same length as the widthwise dimension of the blade 46 and has a fitting groove 540 slightly wider than the plate thickness of the blade 46. The upper edge of the blade 46 is fitted in the fitting groove 540. Fit the parts. As shown in FIG. 1, a plurality of recesses 541 are formed in the longitudinal direction on the bottom surface of the fitting groove 540, and the compression coil springs 60 are formed in the recesses 541.
Are arranged respectively, and the compression coil spring 60 is fitted in the fitting groove 540.
It acts on the upper end surface of the blade 46 fitted in and presses downward.

The elastic biasing means 50 is used for the blade 4
A plurality of (for example, three) compression coil springs 62 are provided between the pair of lower support members 52 and upper support members 54 on the other surface side of 6. The compression coil springs 62 are respectively provided in through holes 124 (for example, three holes) formed in the mounting portion 123 of the developing housing 12 so as to face the other surface of the blade 46 with a predetermined space in the width direction. It is arranged. The through hole 1 is formed on the back surface of the mounting portion 123.
A closing plate 64 for closing one side of 24 is attached by a screw 66. By attaching the closing plate 64, the compression coil spring 62 acts on the other surface of the blade 46 so that one surface of the blade 46 is brought into pressure contact with the peripheral surface of the roller 26 constituting the developer applying means 16.

The pressing force of the blade 46 against the peripheral surface of the roller 26 of the developer applying means 16 can be appropriately set according to the thickness of the developer layer to be formed on the peripheral surface of the roller 26. When the pressure contact force increases, the thickness of the developer layer formed on the peripheral surface of the roller 26 decreases. On the other hand,
When the pressure contact force becomes excessively large, smooth rotation of the roller 26 tends to be impeded. In the developing mode in the illustrated embodiment, the thickness of the developer layer formed on the peripheral surface of the roller 26 is usually 15 to 40 μm, particularly 20 μm.
It is preferably about the same. In order to properly form the developer layer having such a thickness, the blade 46 is applied to the peripheral surface of the roller 26 by linear pressure (pressure per unit length in the width direction).
The pressure may be 0 to 80 g / cm, particularly 20 to 70 g / cm, and particularly 40 to 60 g / cm.

The electrostatic latent image developing device according to the illustrated embodiment is constructed as described above, and its operation will be described below.
When the operation of the electrostatic latent image developing device is started, the roller 26 of the developer applying means 16 and the auxiliary roller 44 of the supplying means 18 are started.
Are driven to rotate in directions indicated by arrows by drive means not shown. The roller 26 of the developer applying unit 16 is continuously driven to rotate in the direction indicated by the arrow 32, and the supplying unit 18 acts on the roller 26 in the developer holding area 34,
The developer retained on the peripheral surface of the roller 26 until then is separated from the roller 26, and the developer is newly supplied to the peripheral surface of the roller 26. In the developer regulation area 36, the blade 46 of the regulation means 20 acts on the developer retained on the peripheral surface of the roller 26 to regulate the developer retained on the peripheral surface of the roller 26 to a required amount. Form a thin layer. Further, by the action of the blade 46, the toner constituting the developer is frictionally charged to have a predetermined polarity, for example, a positive polarity. The blade 46
In the developer regulating action, since the blade 46 is pressed and biased by the plurality of compression coil springs 62 arranged in the width direction, a uniform pressure contact force can be exerted over the entire width direction. Next, in the developing area 38, a developer is applied to the electrostatic latent image on the electrostatic photoconductor provided on the peripheral surface of the rotary drum 1 to develop the electrostatic latent image into a toner image. . For example, the electrostatic latent image has a non-image area charged to about + 700V and an image area charged to about + 120V, and toner is attached to the image area (so-called reversal development). The rotary drum 1 is continuously driven to rotate in a direction indicated by an arrow 3 in FIG.
8, the peripheral surface of the rotating drum 1 and the developer applying means 16
The roller 26 is moved in the same direction as the peripheral surface of the roller 26. The moving speed V2 of the peripheral surface of the roller 26 is equal to that of the rotating drum 1.
It is set to be somewhat higher than the moving speed V1 of the peripheral surface of, and preferably 1.5V1 ≦ V2 ≦ 2.2V1. In this case, the roller 26 conveys a sufficient amount of the developer to the developing area 38, and at the same time, the peripheral surface of the roller 26 is rubbed against the peripheral surface of the rotating drum 1 to once adhere to the non-image portion of the electrostatic latent image. The removed toner is peeled off properly,
Thus, it is possible to obtain a good toner image having an appropriate development density and no fog. As the developer, the volume average particle size (Vol. 50%: the toner having the volume average particle size or less and the toner having the volume average particle size or more have the same volume) is about 8.0 to 12.0 μm, and the volume resistance is 10 ⁸ Ω
A developer consisting only of toner having a size of cm or more is preferably used. During the developing operation, the developer applying unit 1
In the pressure contact portion between the roller 26 and the rotary drum 1 forming the roller 6, in the embodiment shown in FIG. 2, a compression forming elastic biasing means arranged at a position corresponding to the other end of the developer applying means 16 is formed. The pressing force F due to the moment generated by the elastic biasing force F1 of the coil spring 221 and the driving force acting on the driven gear 28 mounted on one end of the developer applying unit 16.
3 works. If the pressing forces F1 and F3 are balanced, the pressure contact force of the roller 26 constituting the developer applying means 16 against the rotating drum 1 becomes substantially equal in the axial direction, and the rotating drum 1
Uneven wear can be prevented.

Next, another embodiment of the present invention shown in FIGS. 4 and 5 will be described. In the embodiment shown in FIG. 4, the axis of the rotary drum 1 and the axis of the roller 26 constituting the developer applying means 16 do not exist on the same plane, and both axes are arranged so as to intersect at a predetermined angle θ. The intersection is located at the center P in the axial direction. The crossing angle θ between the two axes varies depending on the length of the roller 26 constituting the developer applying unit 16 and the material thereof, but is 1.5 ° to 2.
0 degrees is enough. With this configuration, the pressing force of the roller 26 constituting the developer applying unit 16 against the rotating drum 1 becomes substantially uniform in the axial direction, and the uneven wear of the rotating drum 1 can be prevented.

In the embodiment shown in FIG. 5, the intersection of the axis of the rotary drum 1 and the axis of the roller 26 constituting the developer applying means 16 in the embodiment shown in FIG. It is set on the other end side opposite to the one end on which 28 is mounted. With this configuration, the pressure contact force of the roller 26 constituting the developer applying unit 16 against the rotating drum 1 is axially corresponding to the pressing force generated by the driving force acting on one end of the developer applying unit 16. It is possible to make the direction substantially uniform, and it is possible to prevent uneven wear of the rotary drum 1. It should be noted that the technique of intersecting the axis of the rotary drum 1 shown in FIGS. 4 and 5 with the axis of the roller 26 constituting the developer applying means 16 and the elasticity shown in FIGS. By combining the arrangement position of the biasing means and the technique relating to the elastic biasing force, the pressing force of the developer applying means 16 on the rotary drum 1 can be further equalized in the entire axial direction.

[0024]

According to the present invention, the elastic biasing means for pressing the developer applying means toward the image bearing member has its disposition position and elastic biasing force applied to one end of the developer applying means. In consideration of the pressing force generated by the driving force, the pressing force applied to the image carrier by the developer applying means is set to be substantially equal in the axial direction, so that the image carrier has a substantially uniform axial force. A uniform pressing force can be exerted. Therefore, it is possible to prevent uneven wear of the image bearing member that is rubbed by the developer applying unit, and it is possible to extend the life of the image bearing member.

Further, according to the present invention, since the axis of the developer applying means and the axis of the image bearing member are arranged so as to intersect with each other, the pressing force acting on the image bearing member by the developer applying means is Since the central portion and both end portions of the developer applying means are substantially equal to each other, the image bearing body rubbed by the developer applying means is not unevenly worn and the life thereof can be increased.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an image generator equipped with an electrostatic latent image developing device configured according to the present invention.

FIG. 2 is a schematic plan view showing a relationship between a regulating unit which constitutes the electrostatic latent image developing device shown in FIG. 1 and a rotary drum which constitutes an image carrier.

FIG. 3 is a schematic plan view of another embodiment showing the relationship between the regulating means forming the electrostatic latent image developing device shown in FIG. 1 and the rotating drum forming the image carrier.

FIG. 4 is a schematic front view of still another embodiment showing the relationship between the regulating means which constitutes the electrostatic latent image developing device shown in FIG. 1 and the rotary drum which constitutes the image carrier.

FIG. 5 is a schematic front view of another embodiment showing the relationship between the regulating means that constitutes the electrostatic latent image developing device shown in FIG. 1 and the rotating drum that constitutes the image carrier.

FIG. 6 is a schematic plan view showing the relationship between a regulation unit that constitutes a conventional electrostatic latent image developing device and a rotary drum that constitutes an image carrier.

[Explanation of symbols]

 1: Rotating drum 4: Corona discharge device for charging 5: Laser optical part 6: Electrostatic latent image developing device 7: Corona discharge device for transfer 8: Corona discharge device for peeling 9: Cleaning device 10: Static elimination lamp 16: Developer Applying means 18: Supplying means 20: Restricting means 22: Elastic biasing means 26: Roller of developer applying means 28: Driven gear 30: Transmission gear 34: Developer holding area 36: Developer restricting area 38: Developing area 44: Auxiliary roller of supply means 46: Blade 48: Blade support means 50: Elastic biasing means 52: Lower support member 54: Upper support member 60: Compression coil spring 62: Compression coil spring 221: Compression coil spring 222: Compression coil spring 223: Compression coil spring

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masayuki Nakajima, 1-2-2 Tamatsukuri, Chuo-ku, Osaka City Mita Industrial Co., Ltd. (72) Kenichiro Kitajima 1-2-2 Tamatsukuri, Chuo-ku, Osaka City Mita Kogyo Co., Ltd. (72) Inventor Kazuhisa Kondo 1-228 Tamatsukuri, Chuo-ku, Osaka Mita Kogyo Co., Ltd. (72) Makoto Shigekurogi 1-2-2 Tamatsukuri, Chuo-ku, Osaka Mita Kogyo Business

Claims (5)

[Claims] 1. A developing housing mounted on a machine housing and configured to be movable with respect to an image carrier disposed on the machine housing; and a developing device provided on the surface in a developer holding area provided in the developing housing. A developer applying means for holding the developer and conveying the held developer to the developing area to apply the developer to the electrostatic latent image formed on the image carrier, and a driving means attached to one end of the developer applying means. An electrostatic latent means comprising driven means operatively coupled to the means and elastic biasing means disposed between the developer housing and the machine housing for pressing the developer applying means against the image carrier. In the image developing apparatus, the elastic biasing means is provided with the position of the elastic biasing means and the elastic biasing force in consideration of the pressing force generated by the driving force acting on one end of the developer applying means. The pressing force on the carrier is almost axial It was set to be equal, an electrostatic latent image developing device, characterized in that. 2. The electrostatic latent device according to claim 1, wherein the elastic biasing means is disposed at a position corresponding to the other end of the developer applying means having the driven means mounted at one end. Image developing device. 3. The elastic biasing means are respectively disposed at positions corresponding to both ends of the developer applying means, and correspond to the other end of the developer applying means having the driven means mounted at one end. The elastic biasing force of the elastic biasing means disposed at the position corresponding to the pressing force generated by the elastic biasing force of the elastic biasing means disposed at the position corresponding to the one end and the driving force acting on the one end. The electrostatic latent image developing device according to claim 1, wherein the electrostatic latent image developing device is set as described above. 4. A developing housing which is mounted on a machine body housing and is movable with respect to an image carrier disposed on the machine body housing, and a surface of which is developed in a developer holding area provided in the developing housing. A developer applying means for holding the developer and conveying the held developer to the developing area to apply the developer to the electrostatic latent image formed on the image carrier, and a driving means attached to one end of the developer applying means. An electrostatic latent means comprising driven means operatively coupled to the means and elastic biasing means disposed between the developer housing and the machine housing for pressing the developer applying means against the image carrier. In the image developing device, the developer applying means is arranged such that its axis intersects with the axis of the image bearing member. 5. The developer applying means in which the driven means is mounted at one end from the axial center of the developer applying means at the intersection of the axis of the developer applying means and the axial property of the image bearing member. The electrostatic latent image developing device according to claim 4, wherein the electrostatic latent image developing device is located on the other end side of the.