JP2006242991A - Developing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust a distance between a developing roller and a bristle cutting plate in the developing device of an image forming apparatus. <P>SOLUTION: The developing device 4 includes: the developing roller 7; the bristle cutting plate 8; a pair of bearings 10 bearing both ends 7b of the developing roller 7; and a pair of positioning members made of metal 11 fit to the bearings 10 and positioned. Both ends 8a of the bristle cutting plate 8 are positioned on the positioning members 11. The positioning members 11 are externally fit to the respective bearings 10 to be turnable and their fitting positions to the bearings 10 can be changed. The bristle cutting plate 8 adjusts the distance G between the circumferential surface 7a of the developing roller 7 and the bristle cutting plate 8 by making both right and left ends 8a abut on any of the 1st to the 3rd edge parts 11e, 11f and 11g of a 1st outer peripheral edge part 11b positioned just above a center axis line 7c. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a developing device used in an image forming apparatus such as a copying machine.

In the image forming apparatus, for example, an electrostatic latent image is formed on a rotating photosensitive drum, and the formed electrostatic latent image is visualized with toner. A developing device is used to supply toner to the photosensitive drum.
The developing device includes a developing roller that is disposed opposite to the outer periphery of the photosensitive drum and holds the toner on the outer periphery, and a panning plate that regulates the thickness of the toner held on the outer periphery of the developing roller to a predetermined value. ing. The panicle cutting plate is disposed to face the outer periphery of the developing roller, and a predetermined amount of gap is formed therebetween. When the developing roller rotates and the toner held on the outer periphery thereof passes through the gap between the scissor cutting plate and the outer peripheral surface of the developing roller, the thickness of the toner is regulated to a predetermined amount.

For example, in Patent Document 1, the interval between the outer periphery of the developing roller and the panning plate is defined in a state where both ends of the panning plate are in contact with the outer periphery of both ends of the developing roller. Moreover, in patent document 2, the space | interval of the outer periphery of a developing roller and a panning board was prescribed | regulated in the state which the both ends of the panning board contacted the outer periphery of a pair of bearing which supports the both ends of a developing roller. .
Japanese Patent Laid-Open No. 5-313481 JP 2001-154491 A

However, since the distance between the developing roller and the panning plate is not adjustable, the distance varies due to the dimensional error of the parts, and is not constant in the axial direction, which may cause uneven image density.
In addition, it may be possible to make the dimensional accuracy of a plurality of related parts strict so that the interval can be constant in the axial direction, but the manufacturing cost of the parts increases.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an inexpensive developing device in which the distance between the developing roller and the panning plate can be made constant in the axial direction.

  The developing device of the present invention has a circumferential surface, a developing roller for adhering toner to the circumferential surface and supplying it to the photosensitive member, and a circumferential surface facing the circumferential surface at a predetermined interval and adhering to the circumferential surface. And a pair of left and right bearings for receiving both left and right end portions of the developing roller, and a pair of left and right bearings that are externally fitted to the bearings and rotated around a central axis thereof. A pair of left and right positioning members capable of changing the dimension from the center in the radial direction to the outer edge by changing the fitting position in the circumferential direction, The left and right end portions are brought into contact with the predetermined outer edges in the radial direction of the pair of left and right positioning members, whereby the distance from the circumferential surface of the developing roller is defined. According to this invention, by changing the fitting position of the positioning member, the outer edge portion of the positioning member in contact with the panning plate can be made different. As a result, the circumferential surface of the developing roller and the panning plate The interval can be adjusted, and can be realized at a constant predetermined interval in the axial direction. In addition, the distance can be adjusted with a simple structure at a low cost. Furthermore, it is not necessary to tighten the processing accuracy of the part, and the manufacturing cost of the part can be reduced.

  In the present invention, the panning plate may be attached to the housing in a state where the distance from the circumferential surface of the developing roller is defined by the positioning member. In this case, the distance between the panning plate and the developing roller can be maintained in a prescribed state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings with regard to a developing device applied to an image forming apparatus such as a printer, a copying machine, and a facsimile.
FIG. 1 is a schematic diagram illustrating a schematic configuration of a main part of an image forming apparatus to which a developing device according to an embodiment of the present invention is applied.
The image forming apparatus 1 includes a photosensitive drum 2 as a cylindrical photosensitive member for forming an electrostatic latent image, a main charger 3 (charging charger) for charging the photosensitive drum 2, and a photosensitive drum 2. A developing device 4 that visualizes the formed electrostatic latent image with toner, a transfer unit 5 that transfers the toner image onto a sheet as a transfer material, and a surface of the photosensitive drum 2 after the toner image is transferred. And a cleaner 6 for cleaning.

  While rotating the photosensitive drum 2 (arrow M1), the outer peripheral surface of the photosensitive drum 2 is uniformly charged by the main charger 3, and then a beam generated by an optical unit (not shown) based on the image data. Expose with light. As a result, a desired image is formed on the outer peripheral surface of the photosensitive drum 2 to form an electrostatic latent image, and this electrostatic latent image is visualized as a toner image by the developing device 4.

The developing device 4 includes a developing roller 7 for holding toner and supplying it to the photosensitive drum 2, a panning plate 8 for regulating the thickness of the toner held on the developing roller 7, and a toner containing the developing roller. 7 and a housing 9 for supporting the panning plate 8 and the like.
The developing roller 7 has a cylindrical shape and has a circumferential surface 7 a on the outer periphery thereof, and a central axis 7 c thereof is disposed in parallel to the axial direction of the photosensitive drum 2. The circumferential surface 7 a faces the outer circumferential surface of the photosensitive drum 2 with a predetermined interval. The circumferential surface 7a is driven by a drive unit (not shown) and rotates around the central axis 7c of the developing roller 7 (arrow M2).

The panning plate 8 is a long plate material that has an L-shaped cross section and extends in one direction, and its longitudinal direction is parallel to the axial direction of the developing roller 7. The panning plate 8 is opposed to the circumferential surface 7a of the developing roller 7 with a gap G of a predetermined amount G0, and a gap is formed therebetween.
In the developing device 4, toner adheres to the circumferential surface 7 a of the developing roller 7 and is supplied to the photosensitive drum 2 as the developing roller 7 rotates. Before the toner reaches the photosensitive drum 2, the toner passes through the gap between the toner and the cutting plate 8. Thereby, the thickness of the toner adhering to the circumferential surface 7a of the developing roller 7 is regulated to a predetermined value.

FIG. 2 is a partial cross-sectional view of the main part of the developing device 4 shown in FIG. Description will be made with reference to FIG. 1 while focusing on one end portion of the developing device 4 shown in FIG.
The developing device 4 has a bearing 10 as a bearing for receiving the end portion 7b of the developing roller 7 and a positioning member 11 for positioning the developing roller 7 and the panning plate 8 with respect to each other. Bearings 10 and positioning members 11 are disposed at both ends of the developing device 4 in the left-right direction corresponding to the axial direction of the developing roller 7. The bearing 10 is provided with a pair of left and right identical shapes corresponding to both end portions 7b of the developing roller 7, and the positioning member 11 is similarly provided with a pair of left and right identical shapes. Further, both end portions 8a of the panning plate 8 are positioned with respect to the positioning member 11, and are detachably attached to the housing 9 in this state, and are fixed by, for example, screwing.

In addition, a development region in which the latent image on the circumferential surface of the photosensitive drum 2 is developed is set at an intermediate portion in the axial direction of the circumferential surface 7a of the developing roller 7. The gap G can be obtained at a constant value in the axial direction over the entire axial range in the development region.
For this reason, in this embodiment, the end 7b of the developing roller 7, the end 8a of the panning plate 8, the housing 9, the bearing 10, the positioning member 11 and the like are configured in substantially the same manner at both ends. . The positioning member 11 is fitted to the bearing 10 and can be relatively rotated around the bearing 10. The interval G can be adjusted by rotating the positioning member 11 around the central axis 7c to change the circumferential fitting position. Further, the gaps G at both ends in the axial direction can be adjusted independently of each other.

The developing roller 7 includes a thin cylindrical developing sleeve 12 forming a circumferential surface 7a, a magnetic roll 13 disposed in the developing sleeve 12, and a pair of left and right support shafts 14 disposed at both end portions 7b in the axial direction. And have. The developing sleeve 12, the magnetic roll 13, and the pair of metal support shafts 14 are arranged concentrically with each other.
The developing sleeve 12 is rotatable relative to the magnetic roll 13. One support shaft 14 is connected to one end portion of the developing sleeve 12 in the axial direction (corresponding to the end portion 7b) so as to be integrally rotatable. The support shaft 14 is rotatably supported by the housing 9 via one bearing 10 and is driven by a drive unit (not shown).

The magnetic roll 13 is supported so as not to rotate with respect to the housing 9. Although not shown, specifically, the other support shaft 14 is fixed to the other end of the magnetic roll 13 in the axial direction. The support shaft 14 is supported by the housing 9 via the other bearing 10 while being prevented from rotating with respect to the housing 9.
The housing 9 is a resin box-like member, and is opened toward the photosensitive drum 2 side. The housing 9 includes a pair of left and right side plates 9a opposed to each other in the axial direction of the developing roller 7, a connection portion 9b for connecting the pair of side plates 9a to each other, and a pair of left and right screwing portions 9e for screwing the panning plate 8. And have.

3 is a cross-sectional view taken along line III-III shown in FIG. FIG. 4 is an exploded perspective view of the end portion of the developing device 4. Please refer to FIG. 3 and FIG.
The screw fixing portion 9e has an insertion hole 9f through which the fixing bolt 18 is inserted, and a receiving portion 9g that receives the panning plate 8. A screw fixing member 17 into which a bolt 18 is screwed is attached to the screw fixing portion 9e on the side opposite to the scissor cutting plate 8 while being prevented from rotating.

The screw fixing member 17 has a female screw hole 17b into which a fixing bolt 18 is screwed. Between the head of the fixing bolt 18 and the screw fixing member 17, the end portion 8 a of the trimming plate 8 and the screw fixing portion 9 e of the housing 9 are sandwiched.
Referring to FIGS. 2 and 4, the side plate 9 a is formed with a receiving portion 9 c that receives the bearing 10. A corresponding end portion 7 b of the developing roller 7 is received by the receiving portion 9 c via the bearing 10.

  The pair of bearings 10 are configured in the same manner, and are formed of flanged ball bearings as metal rolling bearings. Each bearing 10 has an inner periphery 10a that fits on the corresponding support shaft 14 without rattling and an outer periphery 10b that is concentrically spaced from the inner periphery 10a by a predetermined distance. Although not shown, each bearing 10 has an inner ring that forms an inner periphery 10a, a plurality of balls as rolling elements, and an outer ring that forms an outer periphery 10b. The outer ring is formed with a flange 10c extending in the radial direction by a predetermined length. The outer periphery 10 b is fitted to the receiving portion 9 c of the housing 9 without rattling, and the side surface of the flange 10 c is aligned with the outer surface of the side plate 9 a of the housing 9.

3 and 4, the positioning member 11 is a metal plate-like member processed into a predetermined shape. Specifically, the positioning member 11 is a substantially annular shape made of stainless steel formed by punching. It consists of a sheet metal molded product and forms a single member. A punched product is preferable in order to make the interval G constant in the axial direction because the variation in dimensions among individuals is small.
The positioning member 11 is substantially D-shaped. The positioning member 11 is an inner periphery 11a serving as a fitting surface that is pivotably fitted to the outer periphery 10b of the bearing 10 and an outer edge that positions the earbrush plate 8, and serves as a positioning portion. A first outer peripheral edge portion 11b, a second outer peripheral edge portion 11c as a fixing portion for fixing to the housing 9, and a straight line formed as a notch as an escape portion escaped from the photosensitive drum 2. 11d.

The edge portion 11d is formed in a shape and size so that the positioning member 11 and the photosensitive drum 2 do not interfere when the fitting position of the positioning member 11 is changed for adjustment.
5A, 5B, and 5C are cross-sectional views of the panning plate 8, the positioning member 11, and the like, and illustrate cases where the fitting positions are different. Refer to each figure.

The first outer peripheral edge portion 11b has first, second, and third edge portions 11e, 11f, and 11g. The first, second, and third edge portions 11e, 11f, and 11g have arc shapes that are concentric with the inner periphery 11a, extend in the circumferential direction by a predetermined length, and have different radii. They are connected to each other in an attached manner.
The first edge portion 11e is provided adjacent to the upper end as one side of the edge portion 11d in the circumferential direction, and the radius of the first edge portion 11e is a value R1.

The second edge portion 11f is provided adjacent to the end portion of the first edge portion 11e on the opposite side of the edge portion 11d in the circumferential direction. The radius of the second edge portion 11f is a value R2 (R2> R1), and the value R2 is larger than the value R1 by a predetermined amount, for example, 0.01 mm.
The third edge portion 11g is provided adjacent to the end portion of the second edge portion 11f on the opposite side of the edge portion 11d in the circumferential direction. The radius of the third edge portion 11g is a value R3 (R3> R2), and the value R3 is larger than the value R2 by a predetermined amount, for example, 0.01 mm.

2 and 4, the second outer peripheral edge portion 11 c has an arc shape continuous with the third edge portion 11 g and is fitted in a groove 9 d adjacent to the side plate 9 a of the housing 9. . A side surface 11 i of the positioning member 11 extends along the inner surface of the side plate 9 a of the housing 9. Thus, the positioning member 11 is prevented from falling or rattling.
The panning plate 8 is made of a single member. The panicle cutting plate 8 has both end portions 8a in the longitudinal direction as screwing portions, and an intermediate edge portion 8b as a gap forming portion that is provided in the middle portion in the longitudinal direction and forms the above-described gap with the gap G. ing. The intermediate edge portion 8b extends straight along the longitudinal direction over the entire range in the development region.

The end 8a is an insertion hole 8c through which the fixing bolt 18 is inserted, a receiving portion 8d, and an edge portion as a positioning portion for positioning in contact with the first outer peripheral edge portion 11b of the positioning member 11. 8e.
The insertion hole 8 c has a larger diameter than the shaft portion of the bolt 18 and a smaller diameter than the head portion of the bolt 18.

The edge 8e extends in a straight line continuously to the intermediate edge 8b. In addition, a pair of edge part 8e and the intermediate | middle edge part 8b may be arrange | positioned in a mutually different position seeing from a longitudinal direction.
Referring to FIGS. 2 and 3, the distance G between the outer peripheral surface 7 a of the developing roller 7 and the intermediate edge 8 b of the scissor cutting plate 8 is determined by the value of the radius of the circumferential surface 7 a of the developing roller 7 and the positioning member 11. Is defined as a difference from the value of the radius of the predetermined portion of the first outer peripheral edge portion 11b as the outer edge. For example, the gap G is realized by a value within a required appropriate range with the predetermined amount G0 as the center value, and the specific predetermined amount G0 is 0.3 mm.

  Here, the predetermined portion is a portion that is in contact with the edge portion 8e of the trimming plate 8, and is a portion that is located directly along the vertical direction Z as a predetermined radial direction with respect to the central axis 7c. Depending on the fitting position of the positioning member 11. The predetermined radial direction is a radial direction passing through the edge portion 8e of the scissor cutting plate 8, and corresponds to a direction parallel to the vertical direction Z passing through the central axis 7c in the present embodiment.

Further, at a plurality of predetermined positions separated from each other in the axial direction, specifically, as described later, the gap G is realized with a value within an appropriate range at each of the three positions of the both ends and the center in the axial direction. In this case, the interval G is assumed to be constant in the axial direction.
Usually, when the gap G between both ends in the axial direction is realized with a value within an appropriate range, the intermediate edge portion 8b of the panning plate 8 and the circumferential surface 7a of the developing roller 7 are parallel or substantially parallel to each other, The distance G in the central portion in the axial direction is also a value within an appropriate range, and the distance G can be realized constant in the axial direction.

  However, due to the accumulation of dimensional errors of a plurality of parts constituting the developing device 4, the interval G may vary and deviate from the appropriate range. In particular, the gap G at the central portion in the axial direction of the developing roller 7 is easily affected by the accumulation of dimensional errors, and the variation in the gap G at the central portion tends to be larger than both ends. As a result, for example, even if the gap G between both ends in the axial direction is within a proper range, the gap G at the central part in the axial direction may be out of the proper range, and the gap G may not be constant in the axial direction. .

  In the present embodiment, the gap G between both ends in the axial direction is finely adjusted so that the gap G can be realized within an appropriate range for the entire axial direction. Specifically, as shown in FIGS. 5A, 5B, and 5C, the fitting position of the positioning member 11 is changed. The fitting position includes a first position, a second position, and a third position. The positioning member 11 is displaced to any one of these three positions. Thereby, the radius of the outer edge (corresponding to the above-mentioned predetermined portion in contact with the panning plate 8) of the positioning member 11 located immediately above the central axis 7c can be changed, and the interval G can be adjusted.

In the first position shown in FIG. 5A, the first edge portion 11e is positioned directly above the central axis 7c and abuts on the edge portion 8e of the scissor cutting plate 8. The interval G is adjusted most narrowly.
In the second position shown in FIG. 5B, the second edge portion 11f is positioned immediately above the central axis 7c and abuts against the panicle cutting plate 8, and the interval G is adjusted to the center of the adjustment width.
In the third position shown in FIG. 5C, the third edge portion 11g is positioned directly above the central axis 7c, abuts against the panicle cutting plate 8, and the interval G is adjusted most widely.

  Next, an example of the assembly procedure of the developing device 4 will be described. In the present embodiment, first, the pair of edge portions 8e of the both end portions 8a of the trimming plate 8 is brought into contact with the second edge portion 11f of the first outer peripheral edge portion 11b of the corresponding positioning member 11. In this state, both end portions 8a of the panning plate 8 are fixed to the corresponding screw fixing portions 9e of the housing 9 by screwing. Along with this, the positioning member 11 is pressed against the housing 9 by the cutting plate 8 and fixed.

In the fixed state, the distance G is measured for three positions, both axial ends and a central portion. When all three measurement results are values within an appropriate range, the developing device 4 is regarded as a non-defective product.
Further, in the present embodiment, the dimensions of the parts constituting the developing device 4 are average values within the tolerance range, and the panning plate 8 is brought into contact with the second edge portion 11f so that the above-described parts are A gap G obtained when assembled can be set to a predetermined amount G0. Thereby, in the normal case of assembling parts having an average size within the tolerance range, the second edge portion 11f as the predetermined outer edge is used, without adjusting the fitting position of the positioning member 11, The gap G at both ends can be realized by a predetermined amount G0 or a value within an appropriate range, and the gap G can be made constant in the axial direction. In this way, since the adjustment of the gap G is not normally required, an inexpensive assembly cost equivalent to that of a conventional developing device in which the gap G cannot be adjusted can be realized, and the manufacturing cost is markedly higher than when the total number is adjusted. Can be reduced.

In rare cases, at least one of the three measurement results may be outside the proper range. In this case, the interval G is not constant in the axial direction, and if the interval G is narrow, the image density is low (thin). Conversely, if the interval G is wide, the image density is high (dark). As a result, the image density partially changes and density unevenness occurs, so that the developing device 4 is reassembled.
For example, when the measurement result corresponding to the center portion is out of the appropriate range, the fitting positions of the positioning members 11 at both ends are adjusted to the same direction. When the measurement result is a value smaller than the appropriate range, as shown in FIG. 5C, the panning plate 8 is brought into contact with the third edge portion 11 g of the first outer peripheral edge portion 11 b of the positioning member 11. Thereby, the space | interval G becomes large about the whole of the axial direction, and the space | interval of a center part is implement | achieved by the value within an appropriate range. On the contrary, when the measurement result is a value larger than the appropriate range, as shown in FIG. 5A, the cutting plate 8 is applied to the first edge portion 11e of the first outer peripheral edge portion 11b of the positioning member 11. Make contact. Thereby, the space | interval G becomes small and is implement | achieved by the value within an appropriate range about the whole axial direction.

Further, when the measurement result corresponding to the end portion is out of the appropriate range, the fitting position of the positioning member 11 at the end portion on the deviating side is adjusted in the same manner as the adjustment described above.
After the reassembly, the gap G is measured again at both end portions and the central portion in the axial direction, and if the measurement result is a value within an appropriate range, the developing device 4 is regarded as a good product.
As described above, according to the embodiment of the present invention, by changing the fitting position of the positioning member 11, the radius of the outer edge portion of the positioning member 11 that comes into contact with the panning plate 8 is changed. Can be adjusted. Therefore, for example, even when the gap G is out of the appropriate range only in the central portion in the axial direction, the gap G between the developing roller 7 and the panning plate 8 is adjusted in the axial direction by adjusting the gap G between the end portions. It can be realized in a constant manner.

Further, the adjustment of the gap G can be realized at a low cost with a simple structure of the annular positioning member 11. Furthermore, in order to obtain an appropriate interval G, it is not necessary to tighten the processing accuracy of the parts, and the manufacturing cost of the parts can be reduced.
Further, the panning plate 8 is attached to the housing 9 in a state where the distance G between the positioning plate 11 and the circumferential surface 7 a of the developing roller 7 is defined by the positioning member 11. As a result, even if the displaceable positioning member 11 may be displaced inadvertently, the state in which the interval G between the trimming plate 8 and the developing roller 7 is defined can be maintained.

In the present embodiment, in order to adjust the gap G, the positioning member 11 having the first to third edge portions 11e, 11f, and 11g having an arc shape is rotated around the central axis 7c. Therefore, even if the rotation angle of the positioning member 11 is slightly deviated, the radii of the respective edge portions 11e, 11f, and 11g do not change and adjustment is easy.
Moreover, the following modifications can be considered about this embodiment. In the following description, differences from the above-described embodiment will be mainly described, and the same components are denoted by the same reference numerals and description thereof is omitted.

For example, the fitting position of the positioning member 11 may be adjusted while measuring the gap G.
The pair of bearings 10 as bearings may be ball bearings without a flange, and various rolling bearings can be used. Although it is conceivable to use a sliding bearing as the bearing, the rolling bearing is preferable because the bearing clearance can be reduced, and the positioning accuracy between the developing roller 7 and the outer periphery 10b of the bearing 10 can be increased.

  In addition, the first outer peripheral edge portion 11b as the outer edge of the positioning member 11 for adjusting the gap G is configured so that the radius can be adjusted in three steps. You may make it adjustable, and you may enable it to adjust in four steps or more. Furthermore, it is also conceivable to form the first to third edge portions 11e, 11f, and 11g of the first outer peripheral edge portion 11b of the positioning member 11 with a single inclined surface whose radius changes continuously. .

  Further, the positioning member 11 may be fitted to the outer periphery 10 b of the bearing 10 so as not to be relatively rotatable, and the outer periphery 10 b of the bearing 10 may be fitted to the receiving portion 9 c of the housing 9 so as to be relatively rotatable. Also in this case, the distance G can be adjusted as described above by rotating the positioning member 11 around the central axis 7c and changing the fitting position in the circumferential direction. In addition, various design changes can be made within the scope of the matters described in the claims.

1 is a schematic diagram illustrating a schematic configuration of a main part of an image forming apparatus to which a developing device according to an embodiment of the present invention is applied. FIG. 2 is a partial cross-sectional view of the main part of the developing device shown in FIG. 1 as viewed from the A direction, and the cross-sectional portion shows a II-II cross section of FIG. It is III-III sectional drawing of the principal part of FIG. It is a disassembled perspective view of the principal part of FIG. It is sectional drawing of the principal part of FIG. 3 when the fitting positions of a positioning member differ from each other.

Explanation of symbols

2 ... Photoreceptor drum (photoreceptor)
DESCRIPTION OF SYMBOLS 4 ... Developing apparatus 7 ... Developing roller 7a ... Circumferential surface 7b ... End of developing roller 7c ... Center axis (center)
8 ... Bear cutting plate 8a ... End of (bread cutting plate) 9 ... Housing 10 ... Bearing (bearing)
11: Positioning member 11b: First outer peripheral edge (outer edge)
G ... Interval (predetermined interval)
R1, R2, R3 ... Dimensions from the center of the positioning member to the outer edge Z ... Vertical direction (predetermined radial direction)

Claims (2)

A developing roller that has a circumferential surface and attaches toner to the circumferential surface and supplies the toner to the photoreceptor, and regulates the thickness of the toner that is opposed to the circumferential surface at a predetermined interval and adheres to the circumferential surface. A developing device comprising:
A pair of left and right bearings for receiving the left and right ends of the developing roller;
Left and right that can be externally fitted to each of the above bearings, can be rotated around its center axis, and can change the dimension from the center in the radial direction to the outer edge by changing the fitting position in the circumferential direction. A pair of positioning members;
The development is characterized in that an interval between the panning plate and the circumferential surface of the developing roller is defined by bringing both left and right end portions into contact with outer edges in the predetermined radial direction of the pair of left and right positioning members. apparatus. The developing device according to claim 1,
The developing device according to claim 1, wherein the panning plate is attached to the housing in a state in which a distance from the circumferential surface of the developing roller is defined by a positioning member.

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