JP3056843B2 - Developing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing roller for transporting a developer to a developing area in a state where the developer is adhered to the roller surface, and a developer layer regulation for regulating the developer layer on the roller surface to a constant thickness. The present invention relates to a developing device including a member (a regulating blade).

[0002]

2. Description of the Related Art In image forming apparatuses such as copying machines and printers, an electrostatic latent image or a magnetic latent image on a
Development is performed by supplying a developer by a developing roller. The developer on the developing roller is regulated by, for example, a blade-shaped developer layer regulating member so that the layer thickness becomes substantially uniform over the entire width of the roller so that density unevenness or the like does not occur.

[0003] As a developing device having such a developing roller and a developer layer regulating member, for example, there is one as shown in FIG. 14, and a holding member 3 for holding the developer layer regulating member 2 supplies the developer. The developing case 8 is fixed by screws 5 and the developing case 8 rotatably supports the shaft portions 1a on both sides of the developing roller 1 via bearings. Then, by rotating the developing roller 1, the developer adsorbed on the surface by magnetic force is conveyed to a developing area where the photoconductor is present. In some cases, the shaft of the developing roller is supported by a frame separate from the developing case.

[0004]

However, in an image forming apparatus such as a copying machine or a printer to which such a developing device is mounted, the demand for reducing the size of the entire apparatus has been increasing in recent years. Is required to be as small as possible, but there are some parts that cause inconvenience when they are reduced in size.

That is, if the outer diameter of the developing roller is reduced to reduce the size of the developing device, the positional relationship between the outer peripheral surface of the developing roller and the position of the leading end of the developer layer regulating member is changed. When a deviation occurs from a target position (set value) due to the mounting position or the angle, the curvature of the roller surface (circumference) is smaller in the case of a small-diameter roller than in the case of a large-diameter developing roller. However, there is a problem that it is difficult to regulate the developer layer to a position where the thickness of the developer layer can be regulated properly.

Therefore, when the diameter of the developing roller is reduced as described above, it is inevitable that the dimensions of the components and the mounting angles thereof need to be high, which leads to a significant reduction in productivity and quality. In some cases, this may affect the warranty itself, or if the precision of the parts exceeds the processing limit or the assembly precision limit, it may be difficult to manufacture the developing device itself.

Further, when the thickness of the developing case and the holding member for holding the developer layer regulating member is reduced due to the reduction in size and weight,
If these parts cause large distortion in manufacturing, or the parts themselves have good accuracy, but the mating parts to which they are assembled are insufficient in rigidity, or the weight of the entire developing device is added thereto As a result, there is a possibility that the developer layer regulating member may not be at a position where the developer layer regulating member regulates a uniform developer layer (toner layer) over the entire area in the longitudinal direction of the developing roller.

Further, in a normal developing device, a bias potential is applied to the developing roller and the developer layer regulating member in order to maintain a uniform developer layer. The shape of the power supply terminal for connecting the power supply to the power supply becomes small because the space required for the development device is reduced when the size of the developing device is reduced. This makes processing more difficult, and the reliability of the contact as a terminal is likely to decrease.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to reduce the thickness of a developer layer formed on the surface of a developing roller without increasing the accuracy of components even if the developing device is reduced in size and weight. It is an object of the present invention to control the height to a predetermined thickness. It is another object of the present invention to easily and reliably apply a bias potential to the developing roller and the developer layer regulating member.

[0010]

According to the present invention, in order to achieve the above object, in the above-described developing apparatus, the holding member holding the developer layer regulating member for regulating the thickness of the developer layer of the developing roller is provided. An angle formed by a surface that is in direct contact with the developer layer regulating member or via an adhesive member and a fixing surface of the bearing member that rotatably holds the developing roller to the holding member is substantially 0 ° .

Further, there a fixing surface of the face and the bearing member of the holding member at the same height, the direction parallel to the orthogonal and the fixing surface to the axis of the developing roller and the bearing member to the holding member The developer layer regulating member adjusts the thickness of the developer layer.
To a position where it can be adjusted and regulated to a predetermined thickness.
Adjustment at any point within the movement range.
And a bearing member movement adjusting means for enabling the adjustment .

In the developing device, a center hole is formed in at least one end face of both ends of the shaft of the developing roller, or at least one of both ends of the shaft is projected outside the bearing member. Preferably, the developer layer regulating member and the holding member are formed integrally.

Further, the developing roller, the bearing member, the developer layer regulating member, and the holding member are formed into an integral unit, and the unit is rotatably held around the rotation center of the developing roller. It is preferable to provide a unit rotation restricting member for restricting the amount of movement to a small range. The unit rotation restricting member may include an elastic member, and slight rotation of the unit may be allowed by elastic deformation of the elastic member. Further, in the developing device, the unit rotation restricting member is formed of a conductive member,
It is effective if the member is in contact with the holding member.

[0014]

According to the developing device constructed as described above, the angle between the surface of the holding member, which is in direct contact with the developer layer regulating member or via the adhesive member, and the surface of the bearing member fixed to the holding member is substantially 0 °. Therefore, by simply moving the bearing member in one direction along the fixing surface of the holding member and making fine adjustments, the developing roller is adjusted to have a predetermined thickness by the developer layer regulating member. It can be in a position where it can be regulated.

[0015] The bearing member is adjusted by moving the bearing member.
By adjusting the position of the developing roller by moving the developing roller in one direction by the adjusting means , even if the developing roller has a small diameter, the processing accuracy of each component such as a bearing member, a holding member, and a developer layer regulating member is strict. Even if it is not necessary, the relative position between the developing roller and the developer layer regulating member can be set to a position where the relative position can be regulated to a predetermined layer thickness .

If a center hole is formed in at least one end face of both ends of the shaft portion of the developing roller, or if at least one of both ends of the shaft portion is projected outside the bearing member, the position of the developing roller is located in those portions. Since the force can be applied when adjusting the work, the work becomes easier. further,
If the developer layer regulating member and the holding member are formed as one body, the number of parts can be reduced.

Further, if the developing roller, the bearing member, the developer layer regulating member, and the holding member are formed in an integral unit and the unit rotation regulating member is provided, the developing roller and the developer layer regulating member can Since it is possible to rotate within a slight rotation range regulated by the unit rotation regulating member as it is, the holding member holding the developer layer regulating member is forcibly moved to another distorted fixing member. It is possible to prevent the positional relationship between the developer layer regulating member and the developing roller from being distorted due to being attached, thereby preventing the developing roller from being distorted.

If the unit rotation restricting member is provided with an elastic member, when the unit rotates, the elastic member is elastically deformed to allow the rotation. Further, if the unit rotation restricting member is formed of a conductive member and the member is brought into contact with the holding member, the developer layer restricting member and the holding member are electrically connected, whereby the terminal from the power source is connected to the holding member. Can be applied to the developer layer regulating member to provide an effective bias potential to make the developer layer a uniform thickness.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side view showing the periphery of a developing roller which is a main part of a developing device according to an embodiment of the present invention.
The developing device includes a developing roller 11 and a developer layer regulating member 1.
2, the holding plate 13, and the bearing holding member 14 so that they can be taken out of a developing case (not shown) in which they are fixed in an integrated state.
These are configured as an integral developing roller unit 10.

The developing roller 11 of the developing roller unit 10 conveys the developing agent to the developing area on the photosensitive drum 17 side by rotating while being attracted to the roller surface 11a by magnetic force. The shaft portions 11b, 11b on both sides are rotatably held by bearing holding members (bearing members) 14 via bearings 16, 16,
The bearing holding member 14 is fixed to a holding plate 13 as a holding member by screws 5.

Then, the developing roller 1 is attached to the holding plate 13.
A developer layer regulating member 12 for regulating the thickness of the developer layer formed on one roller surface 11a to a constant value is fixed integrally, for example, by bonding, and the leading end side is below the roller surface 11a of the developing roller 11. At a predetermined contact pressure. Further, in the developing roller unit 10, an angle θ formed between a surface 13a of the holding plate 13 which is in contact with the developer layer regulating member 12 directly or via an adhesive member and a fixing surface 14a of the bearing holding member 14 to the holding plate 13 is set. It is almost 0 °.

Therefore, the surface 13a of the holding plate 13 and the fixing surface 14a of the bearing holding member 14 have the same height. The bearing holding member 14 forms an upper surface 14b opposite to the lower fixed surface 14a in a plane parallel to the fixed surface 14a, and a long hole 18 penetrating from the upper surface 14b to the fixed surface 14a.
It is formed in the direction indicated by the arrow A in FIG. The elongated hole 18 has a width L1 on the short side slightly larger than the outer shape of the screw portion of the screw 5, and when the screw 5 is loosened, the bearing holding member 14
3 can be moved in the direction of arrow A.

The length L in the direction of arrow A in FIG. 2 from the edge of the long hole 18 of the upper surface 14b is determined by the length in the longitudinal direction of the long hole 18 (in the case of a round hole, the hole diameter becomes the hole diameter). Is also bigger. Although not shown, a protrusion (for example, a columnar shape) is formed on the fixing surface (lower surface) 14a of the bearing holding member 14, and the protrusion can be moved in the direction of arrow A in FIG. Is formed in the guide groove. In this manner, the bearing holding member 14 can be relatively moved with respect to the holding plate 13 in a direction A perpendicular to the axis of the developing roller 11 and in a direction indicated by an arrow A in FIG. And it can be fixed by screws 5 at any position within its movement range. Note that this embodiment
Then, the long hole 18 formed in the bearing holding member 14 and there
The inserted screw 5 serves as a bearing member movement adjusting means.
Works.

FIG. 3 is an explanatory diagram for explaining the positional relationship between the developing roller 11 and the developer layer regulating member 12. As shown in FIG. now,
The surface 13a of the holding plate 13 and the fixing surface 1 of the bearing holding member 14 when the developer layer regulating member 12 described in FIG.
4a with respect to the moving direction of the bearing holding member 14 (the direction indicated by the arrow A in FIG. 3), assuming that θ> 0 °, O, O (M, N), c, d Assuming the following positions and dimensions, O: the rotation center of the developing roller 11 O (M, N); the X and Y coordinates of O c: perpendicular to the plane portion of the developer layer regulating member 12 and the center O
D: the shortest distance between the straight line passing through and the top end 12b of the developer layer regulating member 12; the straight line passing through the upper surface of the developer layer regulating member 12 and the tangent to the roller surface (circumference) of the developing roller 11 parallel to the straight line The center O (M, N) of the developing roller 11 is shown by the following equation (1), and the above M and N change depending on the angle θ.

[0025]

M = (c + u1) cosθ + u2 sinθ + (u3−d) sinθ + u4 N = u5− (u6 + c) sinθ + (u7−d) cosθ

In other words, the center O of the developing roller 11
X, Y coordinates O (M, N) cannot be represented by a linear function. Equation 2 is obtained by solving the equations of the above equation 1 to obtain the relationship between the dimensions c and d.

[0027]

## EQU2 ## d = −tan θ × c + (P / cos θ)

Note that u1 to u7 in Equation 1 and P in Equation 2 are constants determined by the outer diameter of the developing roller 11 and the like. Further, in FIG. 3, the tip 12b of the developer layer regulating member 12 is shown in the developing roller for convenience of explanation, but actually, as shown in FIG.
Touch

As can be seen from Equation 2, when the dimension c is changed, the dimension d is also changed, and the rate of change is different for each angle θ. That is, the dimension d is a dimension determined for each developing device depending on the precision of each component constituting the developing device as described later. When θ> 0 ゜ (the closer to 0 °, the smaller the effect), the dimension c is If it is changed, the dimension d also moves at that time.

Therefore, in order to set both the dimensions c and d at a position where the developer layer on the developing roller 11 can be regulated to a predetermined thickness by the developer layer regulating member 12, the bearing holding member 14 and the holding plate 13 are required. Must be regulated to strict component tolerances. If the diameter of the developing roller 11 is reduced, the component accuracy may become impossible in actual processing.

However, in this embodiment, since the angle θ is set to approximately 0 ° (θ = 0 °) as described above, tan0 ° = 0 and cos0 ° = 1 in the equation (3), so that d = P
Thus, the dimension d is a dimension determined only by the outer diameter of the developing roller 11 and the accuracy of each component, and is independent of the dimension c. Therefore, the dimension c is determined under the condition that the dimension d is determined by the accuracy of each component constituting the developing device.
By merely adjusting the position, the relative positional relationship between the developing roller 11 and the developer layer regulating member 12 is set to a position where the developer layer on the developing roller 11 can be regulated to a predetermined thickness by the developer layer regulating member 12. Can be easy.

FIG. 4 shows the dimensions c and d necessary for positioning the developing roller 11 at a position where the developer layer on the developing roller 11 having a small diameter (for example, about φ16) can be regulated to a predetermined thickness. FIG. 3 is a diagram showing the relationship.

In this diagram, if it is attempted to obtain a developer layer having a predetermined thickness by controlling only the component accuracy of the components constituting the developing device, the dimensions c and d are k, l, m. , N is a pass range in which this can be achieved only in a very limited area, and in order to receive the accuracy of the parts stacked in this area,
1, the upper surface 13a of the holding plate 13 for holding the developer layer regulating member 12 from the center of the bearing 16.
In addition to the above dimensions, the thickness and flatness of the developer layer regulating member 12 and the outer diameter of the developing roller 11 are also represented by k and k in FIG.
Accuracy must be distributed to maintain the accuracy between l (m, n).

Therefore, in such a case, the precision required for each part exceeds the processing limit.
However, as in this embodiment, only the dimension d is regulated by the component dimension (accuracy), and the dimension c is
If the method of adjusting the position is used, the area of the dimensions c and d in which the developer layer of FIG. 4 can be regulated to a predetermined thickness expands in the range surrounded by g, i, j, and h. In the distribution of the bearing dimension γ shown in FIG. 1, since the dimensions c and d described above are both limited to k and l when only the precision of the parts is used, g and i have a margin. The precision of each component related to the bearing dimension γ can be greatly reduced.

That is, in this developing device, first, as shown in FIG. 1, the bearing holding member 14 is set on the holding plate 13, the screw 5 is inserted into the long hole 18, and the screw is inserted into the holding plate 13. When inserted into the formed screw holes and fastened and fixed, since the developer layer regulating member 12 is adhered to the upper surface 13a of the holding plate 13, the dimension d described in FIGS. 3 and 4 is determined. . At this time, the dimension d changes depending on the surface accuracy of the holding plate 13 holding the same.

Then, the dimension d determined by stacking the component accuracy in this way is, for example, d1 in FIG.
If (i) is satisfied, the developing roller 11 is adjusted by moving the bearing holding member 14 in the direction of arrow A in FIG. 1 so that the dimension c in FIG. The layer regulating member 12 can easily position the developer layer on the developing roller 11 at a position where the layer can be regulated to a predetermined thickness. The development roller 11 is moved by heating the screw 5 in FIG. 1 so that the bearing holding member 14 can easily move in the direction of arrow A along the long hole 18 (see also FIG. 2). I can do it.

Further, for example, if the developing device is assembled using parts having different model numbers from the above,
4 is d2 (g) in FIG. 4, the developing roller 11 is moved in the direction indicated by the arrow A in FIG.
If it is adjusted to fall within the range between h, it can be easily adjusted to a position where the developer layer can be regulated to a predetermined thickness as in the case described above.

FIGS. 5 to 7 are front views respectively showing the shapes of both ends of the shaft for facilitating the movement of the developing roller 11. The developing roller 11 has a shaft 11
Center holes 19, 19 as shown in FIG. 5 are respectively formed on both end surfaces of b, so that they can be easily moved. As shown in FIG. 6, both ends of the shaft portion 11b of the developing roller 11 have an end surface 14b of the bearing holding member 14.
c, or one end of the shaft portion 11b projects from the end face 14c of the bearing holding member 14 as shown in FIG. 7, and a center hole 19 is formed in the other end face. You may make it easy to move.

FIG. 8 is a side view similar to FIG. 1 showing an embodiment of the developing device in which the developer layer regulating member and the holding plate are integrated, and the portions corresponding to FIG. It is.
In this developing device, the thickness of the developer layer regulating member 22 is made larger than that of the developing device shown in FIG. 1, so that the developer layer regulating member 22 also serves as a holding plate. In this way, the number of parts can be reduced.

FIGS. 9 and 10 are side views similar to FIG. 1 showing another embodiment of the developing device according to the present invention.
Are given the same reference numerals. In this developing device, a developing roller unit 30 is formed by integrally forming a developing roller 11, a bearing holding member 34, a developer layer regulating member (developing blade) 12, and a holding plate 13; (A metal shaft portion) 11b is rotatably supported by a frame 35 via a bearing 16.

In the developing roller unit 30, the right end 13b of the holding plate 13 abuts on the claw of the engaging projection 32 formed at the upper right end of the developing case 31 in FIG. 9 (via the developer layer regulating member 12). The amount of rotation in the direction indicated by arrow C is regulated, and the amount of rotation in the opposite direction is limited by the holding plate 13 on the upper surface 31 a of the developing case 31.
Is regulated by the contact of the lower surface of the. That is, when the lower surface of the holding plate 13 is brought into contact with the upper surface 31a of the developing case 31 as shown in FIG.
Is formed at a position where a gap S is formed between itself and the upper surface.

According to this embodiment, the developing roller unit 30 is rotated by the weight of the entire developing device applied through the frame 35, or the upper surface 31a of the developing case 31 is distorted due to poor dimensional accuracy and the holding plate 13 is distorted. Even if the unit can be pushed up, there is room for the entire unit to rotate around the shaft 11b in the direction of arrow C in FIG. 9 until the right end 13b of the holding plate 13 comes into contact with the engagement projection 32. Even if the thickness of the holding plate 13 is reduced by reducing the size and weight of the developing device, or the thickness of the developing case 31 is reduced, the flat portions of these components are distorted and the dimensional accuracy is deteriorated. Because there is no excessive force on 12,
Since it does not deform, a developer layer (toner layer) having a uniform thickness can be formed on the roller surface 11 a of the developing roller 11 by the developer layer regulating member 12.

FIG. 11 shows still another embodiment of the developing device, and portions corresponding to FIG. 10 are denoted by the same reference numerals. In this developing device, a flanged pin 33 is fixed to the upper right end of a developing case 31, and a hole 13 c formed at one end of a holding plate 13 integrally fixed with the developer layer regulating member 12 is fitted into the pin 33. The springs 36 are elastic members between the lower surface of the holding plate 13 and the upper surface 31a of the developing case 31, and between the upper surface 13a of the holding plate 13 and the lower surface of the upper end of the pin 33. It is inserted.

Even in this case, since the rotation of the developing roller unit in the direction of the arrow E can be slightly permitted by the elastic deformation of the spring 36, no excessive force is applied to the developer layer regulating member 12. Thus, a developer layer having a uniform thickness can be formed on the roller surface 11a of the developing roller 11.

FIG. 12 shows an embodiment of a developing device in which a developing roller unit is attached to a developing case so as to be movable by a small amount, and portions corresponding to those in FIG. 9 are denoted by the same reference numerals.
In this embodiment, a support portion 37 is formed in front of the developing case 31 (to the left in FIG. 12) so as to protrude to the height of the bearing holding member 34, and an engagement hole 37a is formed therein. A pin-shaped projection 38 fixed horizontally on the side surface of the bearing holding member 34 is inserted into the inside 37a.

Since the outer diameter of the projection 38 is smaller than that of the engaging hole 37a on the developing case 31, a gap S is formed between the protrusion 38 and the engaging hole 37a. Even in such a case, as in the above-described embodiment of FIGS. 9 and 11, it is possible to prevent an excessive force from being applied to the developer layer regulating member 12, so that the roller surface 11a of the developing roller 11 is uniformly applied. A developer layer having an appropriate thickness can be formed.

FIG. 13 shows an embodiment of a developing device in which a developer layer regulating member and a holding plate are pressed against each other and a bias potential is applied to the holding plate using a conductive spring member. 10 and 12 are denoted by the same reference numerals. In this embodiment, for example, the U-shaped portion 3 of the holding fitting 39 made of a conductive SUS material is used.
9a, the developer layer regulating member 12 and the holding plate 13 to which the developer layer regulating member 12 is adhered with the double-sided tape 25 are sandwiched by the elastic force of the material itself. A part 39b is formed, and the engaging part 39b is inserted into an engaging hole 31b formed on the lower surface side of the developing case 31, so that the horizontal flat surface 39c of the holding bracket 39 and the lower surface 31c of the developing case 31 are separated. A gap S is formed.

In this manner, the gap S has the same function as the gap S in the above-described embodiments of FIGS. Further, since the holding metal member 39 pressed against the developer layer regulating member 12 and the holding plate 13 is formed of a conductive member, the developer layer regulating member 12 and the holding plate 13 are electrically connected to each other. Holding plate 13
Can be applied to the developer layer regulating member 12. In addition, since the power supply terminal of the power supply to be brought into contact with the holding plate 13 can apply a bias potential to any position of the holding plate 13, the shape of the terminal is such that the terminal is wiped between a plurality of components. The processing of the parts becomes easier as much as the complicated shape is not required, and the reliability in conductivity is improved.

[0049]

As described above, according to the present invention, even if the components such as the developing roller constituting the developing device are reduced in size and weight, the accuracy of the components can be improved without increasing the accuracy of the components. Since the thickness of the formed developer layer can be regulated to an optimum thickness, a stable and uniform developer layer can be formed, so that a high quality image without density unevenness can be obtained.

According to the fourth or fifth aspect of the present invention, the developing roller and the developer layer regulating member are formed in a unit shape and can rotate a small range around the rotation center of the developing roller. Even if the weight of the entire developing device is added to the developing roller, the developing roller rotates within a small range that can be integrated with the developer layer regulating member. Since there is no distortion
Since a regular positional relationship can be maintained without disturbing the relative positional relationship between the developing roller and the developer layer regulating member, a uniform developer layer can be maintained.

According to the invention of claim 6 , the unit rotation restricting member for restricting the amount of rotation of the unit to a small range is formed of a conductive member and is brought into contact with the holding member. Since the developer layer regulating member and the holding member are electrically connected to each other, only a terminal from a power supply is connected to the holding member so that the bias applied to the developer layer regulating member to make the developer layer have a uniform thickness is effective. The potential can be easily and reliably applied. Since the power supply terminal may be attached to an arbitrary position of the holding member, its shape can be simplified.

[Brief description of the drawings]

FIG. 1 is a side view showing a periphery of a developing roller which is a main part of a developing device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the vicinity of a fixing portion of a bearing holding member of the developing device.

FIG. 3 is an explanatory diagram for explaining a positional relationship between a developing roller of the developing device and a developer layer regulating member.

FIG. 4 is a diagram showing the relationship between dimensions c and d necessary to maintain the positional relationship between the developing roller and the developer layer regulating member at a position where the developer layer can be regulated to a predetermined thickness. It is.

FIG. 5 is a front view showing an example in which center holes are formed at both ends of a shaft so that the developing roller of FIG. 1 can be easily moved and adjusted.

FIG. 6 is a front view showing an example in which both ends of a shaft portion are respectively protruded outward from an end face of a bearing holding member so that the developing roller can be easily moved and adjusted.

FIG. 7 is a front view showing an example in which a center hole is formed at one end of the shaft portion and the other end projects outside the bearing holding member.

FIG. 8 is a side view showing an embodiment in which the developer layer regulating member and the holding plate are integrated.

FIG. 9 is a side view showing an embodiment in which the developing roller is unit-shaped so that it can be rotated in a small range.

FIG. 10 is a side view showing a state in which a holding plate of the unit is in contact with a developing case.

FIG. 11 is a side view showing an embodiment in which the unit can be rotated within the elastic deformation range of the elastic member.

FIG. 12 is a side view showing an embodiment in which the unit is attached to the developing case so as to be able to rotate in a small range.

FIG. 13 is a side view showing an embodiment in which a bias potential is applied to the holding plate by a member having a conductive spring property.

FIG. 14 is a perspective view showing the vicinity of a developing roller of a conventional developing device.

[Explanation of symbols]

5 Screw 10, 30 Developing roller unit 11 Developing roller 11a Roller surface 11b Shaft portion 12, 22 Developer layer regulating member 13 Holding plate (holding member) 13a surface 14, 34 Bearing holding member (bearing member) 14a Fixing surface 17 Photoconductor Drum 18 Long hole 19 Center hole 25 Double-sided tape (adhesive member) 31 Developing case 31b Engagement hole 32 Engagement projection 33 Pin 36 Spring 38 Projection 39 Holding bracket (unit rotation restricting member)

Claims (6)

(57) [Claims] 1. A developing roller for attracting a developer to a roller surface by magnetic force and transporting the developer to a developing area, a bearing member for rotatably holding the developing roller, and a developer layer formed on a surface of the developing roller. A developer layer regulating member that regulates the thickness of the developer layer, and a holding member that holds the developer layer regulating member at a position that regulates the thickness of the developer layer and has a surface on which the bearing member can be fixed. In the developing device, an angle formed between a surface of the holding member, which is in direct contact with the developer layer regulating member or via an adhesive member, and a fixing surface of the bearing member to the holding member is substantially 0 ° ; Face and
The fixing surface of the bearing member is at the same height,
Perpendicular to the axis of the developing roller with respect to the holding member.
And the developer layer regulating member in a direction parallel to the fixing surface.
Regulates the thickness of the developer layer to a predetermined thickness
To a position where it can be adjusted
Bearing member that can be fixed at any position within the movement range
A developing device provided with a movement adjusting means . 2. The developing device according to claim 1 , wherein a center hole is formed in at least one end face of both ends of the shaft of the developing roller, or at least one of both ends of the shaft is projected outside the bearing member. A developing device. 3. The developing device according to claim 1 , wherein said developer layer regulating member and said holding member are formed integrally. 4. A developing roller that carries a developer on a roller surface and transports the developer to a developing area, a bearing member that rotatably holds the developing roller, and a thickness of a developer layer carried on the surface of the developing roller. Developing device, comprising: a developer layer regulating member that regulates the thickness of the developer layer; and a holding member that holds the developer layer regulating member at a position that regulates the thickness of the developer layer and has a surface on which the bearing member can be fixed. In the above, the developing roller, the bearing member, the developer layer regulating member, and the holding member are configured as an integral unit, and the unit is rotatably held around the rotation center of the developing roller, A developing device comprising a unit rotation restricting member for restricting the amount of rotation to a small range. 5. The developing device according to claim 4 , wherein said unit rotation restricting member includes an elastic member, and a slight rotation of said unit is allowed by elastic deformation of said elastic member. Developing device. 6. The developing device according to claim 4 , wherein said unit rotation restricting member is formed of a conductive member, and said member is in contact with said holding member. .