JP2005066811A - Outer diameter polishing method of developing roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outer diameter polishing method of a developing roller capable of setting the developing roller and polishing an outer diameter in a state allowing easy centering, when polishing an outer peripheral surface of the developing roller. <P>SOLUTION: The outer diameter polishing method of the developing roller comprises a first step chucking a first end portion of a core by a collet chuck 22, receiving an outer peripheral edge of a second end portion by a recessed conic surface 24A, and supporting the developing roller so as to a center axis of the developing roller and a main shaft 18 coaxial; a second step rotation-driving the centered developing roller about the main shaft 18; and a third step making a rotating grinding wheel abut on an outer periphery of the rotation-driven developing roller, forwardly moving the grinding wheel in a radial direction of the developing roller. The third step is continued until an outer periphery of an elastic layer becomes a predetermined diameter and a predetermined surface state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a developing roller having a cored bar and an elastic layer disposed coaxially around the outer periphery of the cored bar so that the outer periphery of the elastic layer has a predetermined diameter and a predetermined surface state. The outer diameter polishing method for polishing in this way.

  For example, in an image forming apparatus such as a copying machine, a printer, or a facsimile machine, a latent image formed on the surface of a photoreceptor is developed through a developer by an appropriate image forming process mechanism such as an electrophotographic system. A developing device is used. The developing device is configured to transport the developer stored in the hopper onto the surface of the photoreceptor in accordance with the rotation of the developing roller.

  Here, as specifications required for the developing roller, a predetermined surface roughness is required to ensure the developer conveying force, and the developer is uniformly conveyed on the surface of the photoreceptor. In addition, strictness with respect to the outer diameter of the developing roller is required. For this reason, the elastic layer constituting the outer peripheral surface of the developing roller can be polished by a plunger polishing apparatus to set the outer diameter dimension to a predetermined value and to adjust the surface state to a predetermined surface roughness. It is done.

In such a conventional polishing method, as described above, a plunger polishing apparatus is used that performs polishing using a grindstone having a width wider than the width along the axial direction of the elastic layer of the developing roller. If there is a hole in the center of both ends of the core of the developing roller, use a convex center, and if there is no hole in the center of both ends of the core of the developing roller, The center is used for polishing by attaching a developing roller before polishing to a plunger polishing machine.

  However, in the method of attaching the developing roller as described above, when an attempt is made to shorten the polishing time by increasing the amount of cutting, a larger load is applied between the grindstone and the developing roller during polishing. For this reason, when a convex center is used, if the load on the grinding wheel during polishing increases, sliding between the convex center and the core will cause the rotation of the developing roller to become unstable, resulting in the desired outer diameter and surface roughness. Difficult to get. In addition, when a concave center is used, rotational torque can be transmitted by increasing the pressing force of the center against both ends of the core metal, but the core metal bends, has a desired outer diameter and surface roughness. It is difficult to get a good deal. Therefore, when the developing roller is attached to the plunger polishing machine using such a center, a processing time of about one and a half minutes is required to achieve a predetermined outer diameter accuracy and surface roughness of Ra of 3 μm or less. Therefore, a solution is desired from the viewpoint of workability.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to reduce the polishing time for achieving a predetermined surface roughness when polishing the outer peripheral surface of the developing roller, and to improve workability. It is an object of the present invention to provide a method for polishing the outer diameter of a developing roller that can greatly improve the above-mentioned characteristics.

  In order to solve the above-described problems and achieve the object, the developing roller outer diameter polishing method according to the present invention includes a cored bar and an outer periphery of the cored bar. In the outer diameter polishing method for polishing the outer circumference of the elastic layer so as to have a predetermined diameter and a predetermined surface state, the one end of the cored bar This part is chucked by a collet chuck, the outer peripheral edge of the other end is received by a concave conical surface, and the developing roller is supported so that the central axis and the main axis of the developing roller are coaxial with each other A second step of rotating the developing roller centered around the main shaft, and a rotating grindstone against the outer periphery of the rotating developing roller. In the radial direction of the developing roller And a third step of polishing the outer peripheral surface of the elastic layer of the developing roller by advancing the grindstone, and the outer periphery of the elastic layer has a predetermined diameter and a predetermined surface. It is characterized by continuing until it reaches a state.

  According to a second aspect of the present invention, there is provided a method for polishing the outer diameter of a developing roller comprising: a cored bar; and an elastic layer disposed coaxially around the outer periphery of the cored bar. A developing roller having an outer diameter polishing method for polishing an outer periphery of the elastic layer to have a predetermined diameter and a predetermined surface state, wherein both ends of the core metal are chucked by a collet chuck, A first step of supporting the developing roller so that the central axis of the developing roller and the main shaft are coaxial with each other; and a second step of rotating the developing roller centered around the main shaft And a rotating grindstone is brought into contact with the outer periphery of the developing roller being rotationally driven, and the grindstone is advanced along the radial direction of the developing roller, so that the elastic layer of the developing roller Third step of polishing the outer peripheral surface Comprising a, the third step, the outer periphery of the elastic layer is characterized by continued until a predetermined diameter and a predetermined surface condition.

  Further, in the outer diameter polishing method for the developing roller according to the present invention, the width along the axial direction of the grindstone is set wider than the width along the axial direction of the elastic layer according to claim 3, In the third step, both ends along the width direction of the grindstone protrude from the both ends along the axial direction of the elastic layer outwardly along the axial direction, and the grindstone is moved to the developing roller. It is characterized by being brought into contact with.

  The developing roller outer diameter polishing method according to the present invention is characterized in that the elastic layer is made of millable rubber and is solid.

  In the developing roller outer diameter polishing method according to the present invention, the elastic layer is formed of a liquid rubber and is a porous body.

  According to the present invention, when polishing the outer peripheral surface of the developing roller, the outer diameter of the developing roller that can set the polishing time for achieving a predetermined surface roughness short and can greatly improve workability. A polishing method will be provided.

  The procedure of one embodiment of the developing roller outer diameter polishing method according to the present invention will be described in detail with reference to the accompanying drawings.

  First, with reference to FIG. 1, the structure of the developing roller 100 in which the outer diameter polishing method according to one embodiment of the present invention is implemented will be described. Next, with reference to FIG. A schematic configuration of the plunger polishing apparatus 10 that implements the outer diameter polishing method will be described.

  First, as shown in FIG. 1, the developing roller 100 is configured to include a cored bar 102 and an elastic layer 104 disposed coaxially around the outer periphery of the cored bar 102. In this embodiment, the layer 104 is made of millable rubber and is configured as a solid. Here, both ends 102a and 102b of the metal core 102 extend outward from both ends of the elastic layer 104, respectively, and one end 102a on the driving side extends longer than the other end 102b on the driven side. It is set to be issued. Further, in this embodiment, no centering holes are formed on both end faces of the cored bar 102, each of which is formed flat, and both end edges of the cored bar 102 are C The end face is processed in a cut state.

  On the other hand, as shown in FIGS. 2, 3 and 4, the plunger polishing apparatus 10 for carrying out the outer diameter polishing method of this embodiment includes a base 12 fixed on a base (not shown) and the base. 12 is provided with bearing bases 14 and 16 which are mounted apart from each other along the axial direction of the developing roller 100 attached thereto, and one bearing base 14 is fixed to the base 12. The other bearing base 16 is attached so as to be movable along the axial direction. 2 and 3, the other bearing base 16 is shown in a retracted state, that is, a state in which the developing roller 100 can be mounted with a large distance from the one bearing base 14.

  In addition, the plunger polishing apparatus 10 is further attached to one of the bearing bases 14 and is attached to the main shaft 18 that is rotationally driven around its own central axis and the other bearing base 16 so as to be around its own central axis ship. A driven shaft 20 that is rotatably supported, a collet chuck 22 that is detachably attached to the tip of the main shaft 18 and holds the one end 102a of the core metal 102 of the developing roller 100, and a tip of the driven shaft 20 And a receiving jig 24 (details are shown in FIG. 5) for receiving the other end 102b of the cored bar 102 in the center. The main shaft 18 and the driven shaft 20 described above are positioned in a state of being aligned with each other along the axis.

  On the other hand, on the base 12 described above, a main shaft driving mechanism 26 for rotationally driving the main shaft 18, and a bearing base moving mechanism 28 for driving the other bearing base 16 along the central axis of the main shaft 18, Is arranged. The main shaft driving mechanism 26 includes a main shaft driving motor 30 and a transmission mechanism 32 that transmits the rotational force of the main shaft driving motor 30 to the main shaft 18. In this embodiment, although not shown in detail, the transmission mechanism 32 is configured to transmit a driving force via a belt. Further, although not shown in detail, the bearing table moving mechanism 28 is configured to move and drive the bearing table 16 for the driven shaft 20 by hydraulic pressure.

  Moreover, the grindstone mechanism 34 is provided on the base 12 mentioned above. The grindstone mechanism 34 is a grindstone base 36 that is attached to be freely movable along a direction orthogonal to the central axis of the main shaft 18, and a cylindrical shape that is rotatably attached to the grindstone base 36 around its own central axis ship. And a grindstone drive mechanism 40 for rotationally driving the grindstone 38, and a grindstone base moving mechanism 42 for driving the grindstone base 36 forward and backward along a direction orthogonal to the central axis of the main shaft 18. ing. Here, although not shown in detail, the grindstone platform moving mechanism 42 includes a drive motor, a ball shaft that is rotationally driven by this, and a ball nut that is attached to the grindstone table 36 and screwed with the ball shaft, The grindstone table 36 is configured to move and drive.

  Here, as a feature of the present invention, the developing roller 100 is sandwiched between the main shaft 18 and the driven shaft 20 and is driven to rotate according to the rotation of the main shaft 18. One end portion 102 a of the metal core 102 is detachably held by a collet chuck 22 attached to the tip of the main shaft 18, and the other end 102 b of the metal core 102 is attached to the tip of the driven shaft 20. The receiving jig 24 receives the axis so that the axis of the driven shaft 20 and the center axis of the cored bar 102 are aligned with each other.

  Here, the collet chuck 22 is not shown in detail, but the base end portion is attached to the main shaft 18 and the tip end portion is divided into three in this embodiment, and is synchronized with each other along the radial direction. It is provided to be able to advance and retreat in the state. Then, in a state where the tip end portion of the collet chuck 22 is greatly opened outward in the radial direction with respect to the outer diameter dimension of the core metal 102, the one end portion 102a of the core metal 102 can be received inside, and the core metal 102 The outer peripheral surface of the one end portion 102a of the cored bar 102 is firmly held by being biased radially inward with the one end portion 102a received therein.

  Further, as shown in FIG. 5, the receiving jig 24 described above has a base end portion attached to the driven shaft 20 and a concave surface portion 24A for receiving the edge of the other end portion 102b of the cored bar 102 on the front end surface. Is formed. Here, as shown in the drawing, the concave surface portion 24A is formed to have a triangular shape, that is, a conical surface shape as a cross-sectional shape. Here, the diameter of the opening corresponding to the bottom circle in the conical surface shape is set to be larger than the diameter of the other end 102b of the core metal 102 described above. The central axis of the conical surface shape is set so as to be aligned with the axis of the driven shaft 20. As a result, the other end portion 102b of the cored bar 102 whose end edge is C-cut and end-face processed is accommodated in the concave surface portion 24A, and comes into contact with the conical surface of the concave surface portion 24A, thereby forming the concave surface portion 24A. Thus, the center axis of the core metal 102 and the center axis of the other end 102b of the metal core 102 are automatically corrected to be aligned with each other.

  In the plunger polishing apparatus 10 configured as described above, the procedure of an embodiment of a polishing method that is a feature of the present invention will be described below.

  First, when setting the developing roller 100 in the plunger polishing apparatus 10, the grinding wheel base 36 of the grinding wheel mechanism 34 is pulled away from the main shaft 18 and the driven shaft 20 so as to be separated from the main shaft 18 and the driven shaft 20. The bearing base moving mechanism 28 is activated and moved so as to be largely separated from the bearing base 14 that supports the main shaft 18. Thereafter, the collet chuck 22 is opened widely, into which the one end 102 a of the core metal 102 of the developing roller 100 is loosely inserted, and the other end 102 b is loosely inserted into the concave surface 24 A of the receiving jig 24.

  From this state, the collet chuck 22 is closed and the one end 102a of the cored bar 102 is firmly gripped, and the center of the one end 102a is put out (in other words, the one end 102a of the cored bar 102 and the collet chuck 22, That is, the main shaft 18 is set to be coaxial with each other). Thereafter, the bearing base moving mechanism 28 is started again to move the driven shaft 20 toward the main shaft 18, whereby the other end portion 102 b of the core metal 102 and the curved surface of the concave surface portion 24 </ b> A of the receiving jig 24. To the center of the other end 102b (in other words, the other end 102b of the core metal 102 and the receiving jig 24, that is, the driven shaft 20 are set to be coaxial with each other). .

  In this way, the cored bar 102 of the developing roller 100 is coaxially aligned with the main shaft 18 and the driven shaft 20 via the collet chuck 22 and the receiving jig 24, and the polishing apparatus 10. Will be attached to.

  Thereafter, a control panel (not shown) is operated to set the moving speed of the grindstone table 36 by the grindstone table moving mechanism 42 and the polishing amount by the grindstone 38. Then, by pushing down a start button (not shown), the grindstone driving mechanism 40 is activated to rotate the grindstone 38, and the grindstone base moving mechanism 42 is activated, so that the grindstone base 36 that supports the grindstone 38 is the main spindle 16 And driven to move toward the developing roller 100 sandwiched between the driven shaft 18 and the driven shaft 18. Then, when the grindstone 38 is further driven from the state in which the outer circumferential surface of the grindstone 38 is in contact with the outer circumferential surface of the elastic layer 104 of the developing roller 100, the polishing operation is substantially started.

  This polishing operation is continued until the outer periphery of the elastic layer 104 has a predetermined diameter and a predetermined surface state. In other words, when the outer circumference of the elastic layer 104 reaches a predetermined diameter and a predetermined surface state, the driving of the grindstone driving mechanism 40 is stopped to make the rotating state of the grindstone 38 idle, and the grindstone platform moving mechanism 42. Are driven in the opposite direction, and the grindstone 38 is pulled away from the developing roller 100. At the same time or after this, the driving of the main shaft driving mechanism 26 is stopped, the rotational driving of the developing roller 100 is stopped, and the idle state is set.

  Thereafter, the rotation of the developing roller 100 is waited for, or the rotation of the developing roller 100 is forcibly stopped. Then, after the rotation of the developing roller 100 is completely stopped, both ends of the core metal 102 of the developing roller 100 are separately received by receiving mechanisms (not shown), and then the driven shaft 20 is supported. The bearing base 16 is moved so as to be far away from the bearing base 14 by starting the bearing base moving mechanism 28, and the collet chuck 22 is opened widely, whereby the one end 102a of the core metal 102 of the developing roller 100 is opened. Release the gripping state.

  With this release, the developing roller 100 with the outer diameter polished becomes free and is received by the receiving mechanism described above. Then, by moving the receiving mechanism via a moving mechanism (not shown) separately provided, the developing roller 100 with the outer diameter polished is taken out from the plunger polishing apparatus 10 and carried to the next process. It will be. In this manner, a series of procedures for polishing the outer peripheral surface of the developing roller 100 (that is, the outer peripheral surface of the elastic layer 104) is completed.

  As described above, the verification of the shortening of the polishing time achieved by polishing the outer peripheral surface of the developing roller 100 according to the procedure of the polishing method of this embodiment will be described in detail below.

  In this verification work, a polishing target is used whose outer diameter before polishing of the elastic layer 104 of the developing roller 100 is adjusted to 20.5 mm by roughing, from which the outer diameter is 20.000 mm. And polishing time until the surface roughness of the outer peripheral surface is 2 μm or less is determined.

  First, the polishing apparatus 10 used in this verification work is an NC interactive type of a plunger polishing machine (LEO-600-F4L-BML: manufactured by Mizuguchi Seisakusho Co., Ltd.), and the grindstone 38 is GC120BM VRG (manufactured by Noritake Co., Ltd.). ) With a grindstone diameter of 200 mm and a grindstone length of 250 mm. Then, using this polishing apparatus 10, the polishing time was set to 48 seconds and 35 seconds, respectively, and polishing work was performed to prepare 30 samples each.

  Then, the surface roughness Ra of the outer peripheral surface of the developing roller 10 obtained as a result of this polishing operation is obtained by using a surface roughness measuring device (Surfcom 1400-D), the median value, the driving side end value, and the follower. Measurements were made at three locations of side edge values. As a result, the number of measurements, that is, the number of samples is 30 × 3 = 90. As the measurement conditions, JIS-'94 standard was used, and a cut-off value: 0.8 mm, a measurement length: 4.0 mm, a measurement speed: 0.3 mm / s, and a cut-off type: Gaussian were adopted.

  First, the results of polishing with a polishing time of 48 seconds are shown in Table 1 below, FIG. 6 shows the overall roughness distribution, and FIG. 7 shows the roughness distribution by measurement position. Further, the results of polishing at a polishing time of 35 seconds are shown in Table 2 below, FIG. 8 shows the overall roughness distribution, and FIG. 9 shows the roughness distribution by measurement position.

  As is apparent from these results, the procedure defined by the polishing method of the above-described embodiment, in particular, only one end portion 102a of the core metal 102 of the developing roller 100 is chucked by the collet chuck 22 (that is, By carrying out the polishing method in a so-called single collet chucking state, the conventional polishing time for achieving 3 μm as the surface roughness Ra takes 1.5 minutes, but Ra: 2 μm is achieved. It was found that a polishing time of 48 seconds or less was sufficient, and it was found that a polishing time of 35 seconds was sufficient, and the initial purpose was reliably achieved.

  It goes without saying that the present invention is not limited to the configuration of the above-described embodiment and can be variously modified without departing from the gist of the present invention.

  For example, in the above-described embodiment, the concave surface portion 24A that receives the other end portion 102b of the cored bar 102 has been described to have a triangular shape, that is, a conical surface shape as a cross-sectional shape. Needless to say, the shape is not limited to the shape, and for example, as shown in FIG. 10 as a modified example, the cross-sectional shape may be a semicircular shape, that is, a hemispherical shape.

  In the above-described embodiment, it has been described that the developing roller 100 after the polishing operation is once received by a receiving mechanism (not shown) and then conveyed to the next process via the moving mechanism. However, the present invention is not limited to such a procedure. Needless to say, it may be received by an operator's hand without being temporarily received by a receiving mechanism (not shown) and manually carried to the next process.

  Further, in the above-described embodiment, when the both ends of the core metal 102 of the developing roller 100 are supported, the one end 102a is supported by the collet chuck 22 and the other end 102b is supported by the receiving jig 24. However, the present invention is not limited to such a procedure. For example, as shown in FIG. 11 as another embodiment, the other collet chuck is used instead of the receiving jig 24 in the plunger polishing apparatus 10. 44, that is, both end portions 102a and 102b may be held by the collet chucks 22 and 44, respectively. Hereinafter, a polishing method according to another embodiment will be described. In the following description, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in this other embodiment, both end portions 102a and 102b of the cored bar 102 of the developing roller 100 configured in the same manner as in the first embodiment are gripped by the collet chucks 22 and 44, respectively (ie, so-called The procedure is defined to be double collet chucking).

  In this way, the developing roller 100 is polished by double collet chucking, and the outer peripheral surface of the developing roller 100 is polished according to the same procedure as that of the polishing method of the above-described embodiment. In order to verify that the shortening was achieved, the polishing time was divided into 48 seconds and 35 seconds as in the case of the above-described one embodiment. Then, the same surface roughness measurement as in the above-described embodiment was performed.

  First, the results of polishing at a polishing time of 48 seconds are shown in Table 3 below, FIG. 12 shows the overall roughness distribution, and FIG. 13 shows the roughness distribution by measurement position. Further, the results of polishing at a polishing time of 35 seconds are shown in Table 4 below, FIG. 14 shows the overall roughness distribution, and FIG. 15 shows the roughness distribution by measurement position.

  As is clear from these results, by carrying out the procedure defined by the polishing method of the other embodiment described above, the surface roughness can be further increased with the same polishing time as compared with the case of the above-described one embodiment. It has been found that an improved polishing operation can be performed.

  As described above, according to the other embodiment described above, the polishing can be finished in a shorter working time for polishing to the same outer diameter size and the same surface roughness as compared with the case of the above-described one embodiment. become. In this manner, the both end portions 102a and 102b of the core metal 102 of the developing roller 100 are gripped by the collet chucks 22 and 44, respectively, so that the working time can be further shortened and the workability can be improved. Further improving effects can be achieved.

  As described in detail above, by carrying out the procedure of the developing roller polishing method according to the present invention, the working time can be shortened and the workability can be improved. By implementing this procedure, it is possible to improve the work efficiency at the production site, and its industrial applicability is inconsequential.

It is a front view which shows the structure of the developing roller to which the grinding | polishing method concerning this invention is applied. It is a front view which shows roughly the structure of the plunger grinding | polishing apparatus with which the grinding | polishing method concerning this invention for grind | polishing the developing roller shown in FIG. 1 is implemented. It is a top view which shows roughly the structure of the plunger grinding | polishing apparatus with which the grinding | polishing method concerning this invention for grind | polishing the developing roller shown in FIG. 1 is implemented. It is a side view which shows roughly the structure of the plunger grinding | polishing apparatus with which the grinding | polishing method concerning this invention for grind | polishing the developing roller shown in FIG. 1 is implemented. It is sectional drawing which shows the structure of the receiving jig employ | adopted in one Example of the grinding | polishing method concerning this invention. It is a diagram which shows the roughness distribution as a whole when grind | polishing by 48 seconds of grinding | polishing time by single collet chucking. It is a diagram which shows the roughness distribution according to a measurement position when grind | polishing by 48 second of grinding | polishing time by single collet chucking. It is a diagram which shows the roughness distribution as a whole when grind | polishing by 35 seconds of grinding | polishing time by single collet chucking. It is a diagram which shows the roughness distribution according to a measurement position when grind | polishing by 35 seconds of grinding | polishing time by single collet chucking. It is sectional drawing which shows the structure of the modification of the receiving jig employ | adopted in one Example of the grinding | polishing method concerning this invention. It is a top view which shows the structure of the plunger grinding | polishing apparatus for performing the procedure concerning the other Example of the grinding | polishing method concerning this invention. It is a diagram which shows the roughness distribution as a whole when grind | polishing by the polishing time of 48 second by double collet chucking. It is a diagram which shows the roughness distribution according to a measurement position when it grind | polishes by the polishing time of 48 second by double collet chucking. It is a diagram which shows the roughness distribution as a whole when grind | polishing by 35 seconds of grinding | polishing time by double collet chucking. It is a diagram which shows the roughness distribution according to a measurement position when grind | polishing by 35 seconds of grinding | polishing time by double collet chucking.

Explanation of symbols

10 Plunger polishing device 12 Base 14 Bearing base (Spindle side)
16 Bearing base (driven shaft side)
DESCRIPTION OF SYMBOLS 18 Main shaft 20 Drive shaft 22 Collet chuck 24 Receiving jig 24A Concave surface part 26 Main shaft drive mechanism 28 Bearing stand moving mechanism 30 Main shaft drive motor 32 Transmission mechanism 34 Grinding wheel mechanism 36 Grinding wheel base 38 Grinding wheel 40 Grinding wheel drive mechanism 42 Grinding wheel base moving mechanism 44 The other collet chuck

Claims (5)

A developing roller having a mandrel and an elastic layer arranged coaxially around the outer periphery of the mandrel is polished so that the outer periphery of the elastic layer has a predetermined diameter and a predetermined surface state. In the outer diameter polishing method,
One end of the core bar is chucked by a collet chuck, and the outer peripheral edge of the other end is received by a concave conical surface so that the central axis and the main axis of the developing roller are coaxial with each other. A first step of supporting the developing roller;
A second step of rotating the developing roller centered around the main shaft;
A rotating grindstone is brought into contact with the outer periphery of the rotating developing roller, and the grindstone is advanced along the radial direction of the developing roller so that the outer peripheral surface of the elastic layer of the developing roller And a third step of polishing
This third step is continued until the outer circumference of the elastic layer has a predetermined diameter and a predetermined surface state. A developing roller having a mandrel and an elastic layer arranged coaxially around the outer periphery of the mandrel is polished so that the outer periphery of the elastic layer has a predetermined diameter and a predetermined surface state. In the outer diameter polishing method,
A first step of chucking both ends of the cored bar by a collet chuck, and supporting the developing roller so that a central axis and a main axis of the developing roller are coaxial with each other;
A second step of rotating the developing roller centered around the main shaft;
A rotating grindstone is brought into contact with the outer periphery of the rotating developing roller, and the grindstone is advanced along the radial direction of the developing roller so that the outer peripheral surface of the elastic layer of the developing roller And a third step of polishing
This third step is continued until the outer circumference of the elastic layer has a predetermined diameter and a predetermined surface state. The width along the axial direction of the grindstone is set wider than the width along the axial direction of the elastic layer,
In the third step, both ends along the width direction of the grindstone protrude from the both ends along the axial direction of the elastic layer outwardly along the axial direction, and the grindstone is moved to the developing roller. The method for polishing an outer diameter of a developing roller according to claim 1, wherein the outer diameter of the developing roller is brought into contact with the developing roller.   3. The developing roller outer diameter polishing method according to claim 1, wherein the elastic layer is made of millable rubber and is solid. The outer diameter polishing method according to claim 1, wherein the elastic layer is made of a liquid rubber and is a porous body.

Images