JPH0796452A - Grinding method of elastic body roller and its device - Google Patents

Abstract

PURPOSE:To provide a grinding device of an elastic body roller capable of improving production efficiency by way of extensively shortening grinding time, acquiring high precision cocentricity and acquiring high precision surface roughness. CONSTITUTION:A blade 2 supporting an elastic body roller A integrally furnished with a core bar C on the central part of a columnar roller main body B consisting of an elastic body by way of projecting part of it to both sides is provided, and by sandwiching the elastic body roller A supported on this blade 2, a grinding grinding wheel 3 is provided on one side and an adjustment grinding wheel 4 is provided on the other side. At least one of the grinding grinding wheel 4 and the adjustment grinding wheel 3 is arranged free to advance and retreat against the elastic body roller A, and at a rotational central position in the final grinding state of the elastic body roller A above the blade 2, a pair of center support tools 5.5 fit in a central hole provided on bothend surfaces of the core bar C of the elastic body roller A and supporting the elastic body roller A free to connect and disconnect and free to revolve is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for grinding an elastic roller used as, for example, a developing roller, a charging roller, a paper feeding roller, a transfer roller and a fixing roller in an office automation equipment such as a copying machine or a laser printer, and a method thereof. It relates to the device.

[0002]

2. Description of the Related Art An elastic roller of this type has a structure in which a cored bar which is made of an elastic material such as rubber, urethane resin, silicon resin or the like is integrally provided with a cored bar penetrating the cylindrical roller main body. Further, in the elastic roller of the type described above, the accuracy of the center of rotation (also referred to as concentricity) of the cored bar with respect to the roller body required is extremely high at 0.1 to 0.05 mm or less. The elastic roller is usually molded using a mold, and at the time of molding, the core metal is pre-loaded at the center position of the mold and molded integrally with the roller body.

In practice, there is a limit to improving the precision of the mold, so after the roller body as the work A'and the core metal are integrally molded, as shown in FIG. 10, the fixed center on the headstock side is formed. 62. One end of the work A ′ is attached to the work piece 62 via a chuck, and the work piece A ′ is supported by being sandwiched between the work piece A ′ and a tailing center side rotation center 63. It is a general manufacturing method that the grinding wheel is rotated and reciprocated along the longitudinal direction of the work A ′ while being in contact with the work A ′ to obtain the required concentricity by grinding.

As the grinding device, in addition to the traverse type cylindrical grinding device (FIG. 10) described above, the following grinding device is generally used.

One end of the work A ′ is attached to a fixed center 62 on the headstock side via a chuck, and the work A ′ is supported by being sandwiched between the work center A ′ and a rotary center 63 on the tailstock side. A plunge-cut type cylindrical grinding device (FIG. 11) having a structure in which a grinding wheel 65 having a width wider than the width of an object to be ground is rotated without being reciprocated while being rotated.

An elastic roller is placed on a blade (work rest) 66, and a grinding wheel 67 and an adjusting wheel 68 are mounted.
Work A'with the grinding wheel 68
A centerless grinding device (FIG. 12) having a structure in which the grinding wheel 67 is brought into contact with the surface of the work A ′ and is rotated at the same time as the rotation is performed.

[0007]

However, the above-described conventional method for manufacturing an elastic roller or the above-described conventional manufacturing method using a general grinding device has the following disadvantages.

A) In the case of a traverse type cylindrical grinding machine: (1) The length of the roller body of the above elastic roller is 200
The width of the grinding wheel is 25, while it is about 300 mm.
Since it is quite narrow around mm, it takes time to traverse and production efficiency is poor.

(2) The hardness (JIS A) of the elastic body is especially 30
If the degree of rotation is low or less, the roller body is likely to be greatly deformed during grinding, which makes it difficult to grind, the grinding operation requires a long time, and the grinding degree (roughness) of the roller surface is low. Therefore, in order to increase the roller surface roughness after grinding,
When so-called wet grinding is performed by applying a grinding liquid,
Further, the grinding efficiency is lowered and it takes more time.

(3) Since the elastic roller has a relatively long length as described above, when the grinding wheel is brought into contact with the elastic roller, the intermediate portion in the longitudinal direction of the elastic roller tends to bend, and The middle part may swell and be ground like a drum.

B) In the case of the plunge cut type cylindrical grinding machine: (1) The advantage is that the entire width of the roller body can be ground at one time, but the wider the width of the roller body, the greater the grinding resistance. When the elastic body is ground by a full-width grinding wheel, if the hardness becomes low (JIS A is less than 60 °), the parts on both sides of the roller body where grinding is insufficient (remaining part of grinding) Occurs and is ground into a staggered shape.

(2) Since the grinding wheel contacts the entire width of the roller body to increase the grinding resistance, slippage occurs between the chuck of the rotation center 62 and the end of the core metal, and the rotation center 62 runs idle. There is a risk. Further, for the same reason, since the grinding amount and the load during the grinding work are large, the elastic roller causes a center deviation and vibrates.

(3) The surface of the roller main body may be heated at the contact portion between the grinding wheel and the surface of the roller main body to be thermally deformed.

C) In the case of a centerless grinding machine: (1) Although it has an advantage of being excellent in a perfect circular action and having a short grinding time, the concentricity cannot be obtained because the center of rotation of the object to be ground is not determined.

(2) Since the amount of grinding and the load during the grinding work are large, the elastic roller may cause runout, and the accuracy of the outer diameter of the roller body cannot be improved.

The present invention has been made in view of the above points, and the grinding time is greatly shortened, the production efficiency is improved, the high-precision concentricity is obtained, and the high-precision surface roughness is obtained. An object of the present invention is to provide an elastic roller grinding method and a grinding apparatus having the above advantages.

[0017]

In order to achieve the above object, the grinding device for an elastic roller of the present invention has a cored bar at the center of a cylindrical roller body made of an elastic body, and a part of the cored bar protrudes to both sides. In the grinding device for elastic rollers provided integrally with each other, a blade supporting the elastic roller and a grinding wheel on one side sandwiching the elastic roller supported on the blade, on the other side, With each adjusting grinding wheel provided, at least one of the grinding wheel and the adjusting grinding wheel is configured to be movable back and forth with respect to the elastic roller, at the rotation center position in the final grinding state of the elastic roller above the blade. There are provided a pair of center support members that are fitted in center holes provided on both end surfaces of the core of the elastic roller and that movably and rotatably support the elastic roller.

According to a second aspect of the present invention, it is preferable that each of the center supports is provided with an annular body that surrounds a cored bar projecting from the roller body and has an end surface facing the end surface of the roller body.

The method for grinding an elastic roller according to the present invention is the method for grinding an elastic roller, comprising a cylindrical roller body made of an elastic material, and a cored bar integrally provided with a part of the cored bar protruding to both sides. On the blade between the grinding wheel and the adjusting wheel arranged opposite to each other, the elastic roller is placed, above the blade, at the rotation center position in the final grinding state of the elastic roller, The center of both end surfaces of the core of the elastic roller is rotatably and detachably supported,
The adjusting grind wheel is brought into contact with the roller body of the elastic roller to rotate it, and while the grinding wheel is being rotated, it is moved forward relative to the roller body to come into contact with the surface of the roller body. The grinding wheel is further advanced to the final grinding position.

According to a fourth aspect of the present invention, the elastic roller is placed on the blade between the grinding wheel and the adjusting wheel which are arranged opposite to each other, and the elastic roller is placed above the blade. At the center of rotation in the final grinding state, the centers of both end faces of the core bar of the elastic roller are rotatably and detachably supported, and the adjusting grinding wheel is brought into contact with the roller body of the elastic roller. While rotating the grinding wheel, the wheel is moved forward relative to the roller body to bring it into contact with the surface of the roller body, and then the wheel is further moved to the final grinding position while the grinding wheel is rotated. While supporting the center of both end faces of the cored bar of the elastic roller at or immediately before the final grinding position of the car, move between the grinding wheel and the adjusting wheel to one end in the width direction of the grinding wheel. And it can also be.

Further, on the blade between the grinding wheel and the adjusting wheel which are arranged to face each other,
The elastic roller is placed, and the center of both end faces of the core bar of the elastic roller is rotated at a rotation center position above the blade in a predetermined grinding state before the final grinding state of the elastic roller. It is movably and detachably supported, and the adjusting grind wheel is brought into contact with the roller body of the elastic roller to rotate it, and while the grinding wheel is rotating, it is moved forward relative to the roller body to roll the roller. After contacting the surface of the main body, by further advancing the grinding wheel to the final grinding position or the grinding position immediately before the final grinding position, the elasticity of the roller body of the elastic roller and the core metal is obtained. Release the center support of the core of the body roller and rotate the grinding wheel at the final grinding position to grind the roller body, or rotate the grinding wheel to face the roller body. The elastic body roller may be further advanced to the final grinding position, and the elastic roller may be placed on the blade between the grinding wheel and the adjusting wheel that are arranged to face each other as described in claim 6. , The adjustment grinding wheel is inclined with respect to the elastic roller, and at the center of rotation in a predetermined grinding state before the final grinding state of the elastic roller above the blade, the core metal of the elastic roller is The centers of both end surfaces are rotatably and detachably supported, and the adjusting grind wheel is brought into contact with the roller body of the elastic roller to rotate the same, and at the same time, the grinding wheel is rotated to the roller body. After relatively advancing to contact the surface of the roller body, the grinding wheel is further advanced to the final grinding position or the grinding position immediately before it, whereby the elastic roller roll After producing the concentricity between the main body and the core metal, the center support of the core metal of the elastic roller is released and the grinding wheel is rotated at the final grinding position, or the final grinding is performed while rotating the grinding wheel. While further advancing to the position, the elastic roller may be moved to one end in the width direction of the grinding wheel between the grinding wheel and the adjusting wheel.

When the surface of the roller body is ground by the grinding wheel as described in claim 7, the roller body is prevented from elastically deforming in the longitudinal direction by pressing the end faces on both sides of the roller body. Is preferred.

[0023]

According to the grinding apparatus of the present invention having the above-mentioned structure, the elastic roller is formed by inserting the pair of support tools into the center holes at both ends of the core of the elastic roller having the concentricity after molding. Rotatably supported. In this state, the elastic roller is also supported on the blade. Then, the adjusting roller is brought into contact with one surface of the roller body of the elastic roller to rotate the elastic roller, and at the same time, the grinding wheel is rotated to move forward relative to the roller body. Contact and advance to final grinding position. Since the rotation center support position of the elastic roller by the support is the rotation center position when the surface of the roller body is finally ground, the adjustment grinding wheel and the grinding wheel are brought into contact with the surface of the roller body. The state corresponding to the deviation of concentricity,
In other words, in centerless grinding, the amount of movement of the rotation center of the roller body between the start of grinding and the end of grinding is absorbed by the elastic deformation of the roller body. That is, the roller body of the elastic roller is ground while maintaining the concentricity with the core metal from the start of grinding. In this way, when the surface grinding work of the roller body is completed,
An elastic roller having a highly accurate concentricity in which the deviation of the concentricity after molding is corrected can be obtained. Since the grinding is performed while absorbing the deviation of the concentricity by utilizing the elastic deformation of the roller body as described above, when the roller body is a rigid body such as a metal roller, the grinding device of the present invention is used. And the grinding method is not applicable. The hardness of the elastic body to which the present invention is applied is not limited, but is 90 in terms of JIS A hardness.
Intended for elastic bodies below ゜. Further, the grinding apparatus and the grinding method of the present invention basically use so-called wet grinding in which a grinding liquid is applied to the contact portion between the roller body and the grinding wheel during the grinding operation.

According to the second aspect of the present invention, even when the hardness of the roller body is low and the roller body is easily elastically deformed, the end surface of the roller body comes into contact with the end surface of the annular body provided in the center support, and the end portion of the roller body is contacted. Is prevented from deforming in the longitudinal direction, so that defective grinding is less likely to occur at the end of the roller body.

The work by the grinding apparatus of the present invention is basically the same as the centerless grinding, except that the elastic roller is supported at the rotation center position in the final grinding state by a pair of supporting tools. It has advantages such as high work efficiency and short grinding time, which are the features of centerless grinding, and excellent roundness and high precision surface roughness.

According to the grinding method of the present invention (claim 3), the elastic roller is supported by the grinding wheel, the adjusting wheel, and the blade, and at the same time, both ends of the cored bar protruding from the roller body are supported. The center of the surface is supported at the rotation center position in the final grinding state. In this state, normally (when there is a deviation in concentricity between the roller body and the core metal), the deviation is absorbed by elastic deformation of the roller body in accordance with the deviation in concentricity.
Then, the grinding wheel moves forward to the final grinding position with respect to the roller body, and the surface of the roller body is ground with the center of the core metal as the center of rotation for high-precision concentricity. By the similar action (the action of applying a rotational force to the elastic body roller by the adjusting grind wheel and grinding by the grinding wheel with the adjusting grind wheel backed up), a high surface roughness of the roller body can be obtained.

The grinding method according to claim 4 is almost the same as the grinding method according to claim 3, but both ends of the core metal of the elastic roller are in a state where the grinding wheel is advanced to the final grinding position or immediately before that. By moving the grinding wheel to the end in the width direction while supporting the center of the surface, for example, when a part of the surface of the grinding wheel is scratched, the surface of the roller body may be streaked. Even if the contact position between the surface of the roller body and the surface of the grinding wheel changes, the streaks disappear. The action of moving the roller main body in the width direction in contact with the grinding wheel is possible because the roller main body is an elastic body and has a small resistance when moving.

The grinding method according to claims 5 and 6 is also similar to the grinding method according to claim 4, but when the concentricity of the elastic body roller comes out at or before the final grinding state,
Release the center support of both ends of the core bar of the elastic roller,
The final finishing is centerless grinding. As a result, the accuracy of the outer diameter of the surface of the roller body is improved, and since the grinding wheel having a small size can be used, the surface roughness of the roller body is considerably improved. Incidentally, in the grinding method according to claim 6, as in the method according to claim 3, an action of moving the roller body to the end of the grinding wheel in the width direction is added, so that the surface of the roller body is tentatively moved during grinding. Even if streaks occur, the streaks disappear by changing the contact position between the surface of the roller body and the surface of the grinding wheel.

According to the grinding method of claim 7, even when the hardness of the roller body is low and the roller body is easily elastically deformed, the end portion of the roller body is prevented from being deformed in the longitudinal direction during the grinding work. Grinding failure is less likely to occur at the end of the main body.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view schematically showing an embodiment of an elastic roller grinding device, FIG. 2 is an enlarged sectional view showing a part of FIG. 1, and FIG. 2 (a) shows an adjusting grinding wheel. FIG. 2B shows a moving type grinding device, and FIG. 2B shows a moving type grinding device. FIG. 3 is a perspective view showing a developing roller which is an example of an elastic roller.

As shown in FIG. 1, a grinding device 1 includes a blade 2 for mounting and supporting a developing roller A as an object to be ground.
And a grinding wheel 3 for applying a rotational force to the developing roller A supported on the blade 2 and a grinding wheel 4 for grinding the developing roller A. These configurations are known centerless grinding devices. Have in common with.

As shown in FIG. 3, the developing roller A comprises a cylindrical roller body B made of an elastic body, and a cored bar C penetrating the central part thereof and partially protruding on both sides. A conical center hole D is formed at the center of both end faces of the. In this developing roller A, a core metal C and a roller body B are integrally formed by casting urethane resin or the like in a state where a core metal C is set at the center of a cylindrical mold (not shown). To be done. In this example, the hardness of the roller body B (JISA)
Is about 30 °, the outer diameter of the roller body B is 20 mm, the length of the roller body B is 200 to 300 mm, and the deviation of the concentricity (per radius) of the developing roller A after molding is usually
It will be about 0.3 mm.

In the centerless grinding apparatus, the position of the center of rotation (also referred to as the center) of the object to be ground is constantly moved from the grinding start state to the final grinding state, but in the grinding apparatus 1 of the present invention, the object is the object to be ground. The rotation center of the developing roller A is previously fixed at the rotation center position in the final grinding state, and the development roller A is supported at the rotation center position. Therefore, above the blade 2, a pair of tailstock center support members 5 having conically pointed tip portions fitted in the center holes D on both end faces of the core metal C are rotatable in opposition to each other. Be prepared for. The positions of the pair of support tools 5, 5 can be adjusted in synchronism, but once set to a predetermined position,
It is always held in that position during the grinding operation. Each of the support tools 5, 5 is movable back and forth in opposite directions, and supports the center hole D on both end surfaces of the core metal C by sandwiching it from both sides. Although not shown, the base end side of each support 5 is rotatably supported via a bearing. The support 5
Instead of rotatably supporting the support roller 5, the support tool 5 is supported so as not to rotate, and the developing roller A is rotated by sliding it between the tip of the support tool 5 and the center hole D of the core metal C. It can also be moved.

FIG. 2 shows a state where the surface of the roller body B is started to be ground. FIG. 2 (a) shows a grinding apparatus 1 in which the grinding wheel 4 advances and retreats, and FIG. 2 (b) shows grinding. The grinding wheel 1 is held in a fixed position, and the adjusting wheel 3 is moved back and forth. In any case, the developing roller A is located at the rotation center position in the final grinding state and the pair of supporting members 5
The roller body B is elastically deformed as shown in FIG. Grinding device 1 in which the grinding wheel 4 moves back and forth
Then, as shown in FIG. 2A, when the grinding wheel 4 advances from the solid line position to the virtual line position and the roller body B is ground from the solid line state to the virtual line state (final grinding state), the work is completed. finish. In this state, the rotation center position of the core metal C and the rotation center position of the roller body B coincide with each other, and highly accurate concentricity is obtained. In the case of this example, the deviation of the concentricity at the end of grinding is
It is improved to about 0.05 to 0.005 mm.

By the way, there are several methods for grinding the surface of the roller body B by using the grinding apparatus 1 of the above-mentioned embodiment.

First grinding method: In FIG. 4, as shown in FIG. 4 (a), a grinding wheel 4 and an adjusting wheel 3 are used.
The developing roller A is placed on a blade (not shown) between the developing roller A and the blade. In the case of this example, in that state, the developing roller A contacts the adjusting grinding wheel 3, and the grinding wheel 4 is separated to the front standby position.

As shown in FIG. (B), after adjusting the positions of the support tools 5 on both sides so that the roller A can be supported at the rotation center position in the final grinding state of the developing roller A,
The tips of the respective support members 5 are fitted into the center holes D on both end surfaces of the core metal C of the developing roller A, and the developing roller A is rotatably supported at the rotation center position in the final grinding state.

As shown in FIG. (C), the grinding wheel 3 is rotated in a state of being in contact with the surface of the roller body B, and the grinding wheel 4 is also rotated and advanced toward the roller body B for grinding. While the liquid is sprayed on the surface of the roller body B, the grinding wheel 4 is brought into contact with the surface of the roller body B to start the grinding operation. At this time, the roller body B elastically deforms as shown in FIG. 2A, as described above. Then, while the grinding wheel 4 is being rotated, the grinding wheel 4 is gradually advanced to the final grinding position to continue the grinding operation, and the operation is completed.

After the grinding is completed, as shown in FIG.
The grinding wheel 4 is moved back to the original standby position while being rotated.

As shown in FIG. (E), the rotations of the grinding wheel 4 and the adjusting wheel 3 are stopped, the supporting tools 5 on both sides are retracted, and the support of the developing roller A is released.
A series of work is completed.

Second grinding method: In FIG. 5, as shown in FIGS. (A) and (b), it is common to the operations of and of the first grinding method described above.

As shown in FIG. (C), the adjusting grinding wheel 3 is rotated in a state of being in contact with the surface of the roller body B as described above, and the grinding wheel 4 is also rotated toward the roller body B while rotating. After advancing, the grinding liquid is applied to the surface of the roller body B and brought into contact with the surface to start the grinding work, and then the grinding wheel 4 is rotated and gradually advanced to the final grinding position to continue the grinding work.

As shown in FIG. (D), when the grinding wheel 4 is advanced to the final grinding position or immediately before that, the rotation centers of both end surfaces of the core bar C of the developing roller A are supported by the support tools 5.5. As it is, the space between the grinding wheel 4 and the adjusting wheel 3 is moved in the width direction until the right end of the roller body B comes to the right end of the grinding wheel 4.

As shown in FIGS. (E) and (f), it is common to the operations of and of the first grinding method described above.

When the second grinding method is carried out, not only the supporting tools 5, 5 on both sides of the grinding device 1 move back and forth in opposite directions, but also in a state of being sandwiched from both sides of the developing roller A. In order to be able to reciprocate in the width direction between the grinding wheel 4 and the adjusting wheel 3, it is necessary to add a configuration for simultaneously moving the support tools 5 in the same direction.

Third grinding method: In FIG. 6, as shown in FIGS. (A) and (b), it is common to the operations of and of the first grinding method described above.

As shown in FIG. (C), the adjustment grinding wheel 3 is rotated in a state of being in contact with the surface of the roller body B as described above, and the grinding wheel 4 is also rotated toward the roller body B while rotating. After advancing, the grinding liquid is sprayed on the surface of the roller body B and brought into contact with the surface of the roller body B to start the grinding work, and then the grinding wheel 4 is rotated to gradually advance to the vicinity of the final grinding position to perform the grinding work. continue.

As shown in FIG. 6D, with the grinding wheel 4 being advanced to the final grinding position or just before that, the supporting tools 5 on both sides of the core bar C of the developing roller A can be arranged.
-Releasing 5 in the opposite directions to release the support of the developing roller A. In this state, the centerless grinding is performed by rotating the grinding wheel 4 at the final grinding position while applying the grinding liquid, or advancing to the final grinding position while rotating the grinding wheel 4 while applying the grinding liquid.

As shown in FIG. (E), the rotation of the grinding wheel 4 and the adjusting wheel 3 is stopped, and the grinding wheel 4 is retracted from the developing roller A to the standby position, thereby completing a series of operations. .

Fourth grinding method: In FIG. 7, as shown in FIGS. (A) and (b), it is common to the operations of and of the first grinding method described above. Prior to the work, the adjusting grinding wheel 3 is horizontally swung by a predetermined angle around an intermediate position in the longitudinal direction.

As shown in FIG. (C), in common with the work of the above-described third grinding method, while rotating the grinding wheel 4, the grinding wheel 4 is gradually advanced to the vicinity of the final grinding position to move the surface of the roller body B. Continue the grinding work.

As shown in FIG. 6D, with the grinding wheel 4 being advanced to the last grinding position or just before that, the supporting tools 5 on both sides of the core metal C of the developing roller A are arranged on both sides.
・ Retract 5 to release the support of the developing roller A. In this state, while rotating the adjusting grinding wheel 3 and rotating the grinding wheel 4 at the same time, the grinding wheel 4 is rotated at the final grinding position or the grinding wheel 4 is rotated while the grinding fluid is being applied. Centerless grinding is performed by advancing to the grinding position. Since the adjusting grinding wheel 3 is tilted in the horizontal direction, the developing roller A moves in the width direction between the grinding wheel 4 and the adjusting grinding wheel 3. When the right end of the roller body B moves to the right end of the grinding wheel 4,
The rotations of the grinding wheel 4 and the adjusting wheel 3 are stopped and the grinding operation is completed.

As shown in FIG. 7E, the series of operations is completed by retracting the grinding wheel 4 from the developing roller A to the standby position.

Next, FIG. 8 shows another embodiment of the grinding apparatus. In both of the grinding devices of the present example, the end portion of the roller body B is pushed outward in the longitudinal direction by being sandwiched and pressed between the grinding wheel 4 and the adjusting wheel 3 as shown in FIG. 9 during the grinding operation. It is provided with a means for preventing elastic deformation and grinding into a staggered shape, and is particularly effective when the hardness (JISA) of the elastic body forming the roller body B is as low as 60 ° or less. That is, the one shown in FIG. 8A has a metal annular body 6 having an outer diameter slightly smaller than the outer diameter of the roller body B and an inner diameter larger than the outer diameter of the core metal C. It has a structure integrally formed around the tool 5. The length by which the annular body 6 projects from the tip of the support 5 is such that the end face of the annular body 6 is the end face of the roller body B when the tip of the support 5 is fitted in the center hole D of the core metal C. Or just touch
Set so that the gap between both end surfaces is within 1 mm. The apparatus of this example can be used for the first and second grinding methods described above.

The one shown in FIG. 8 (b) has an outer diameter common to the annular body 6 and an inner diameter which can be fitted into the core metal C, and the length is the length of the protruding portion of the core metal C. It is composed of a metal annular body 7 that is shorter than the above, and a screw hole 7a is provided inward in the radial direction from the outer peripheral surface of the annular body 7, and the annular body 7 is fixed by a set screw 8 screwed into the screw hole 7a. It can be fixed around C. The apparatus of this example can be used for any of the grinding methods including the third and fourth grinding methods.

In each of the above-described embodiments, the case of grinding the developing roller as an example of the elastic roller has been described, but needless to say, the present invention can be applied to not only the developing roller but also the paper feeding roller and the like.

[0058]

As is apparent from the above description,
The grinding apparatus and the grinding method of the present invention having the above-mentioned configurations have the following effects.

(1) In the grinding apparatus of the present invention (claim 1), the number of supporting tools for supporting the elastic roller is increased as compared with the conventional centerless grinding apparatus, and there is almost no difference in structure. In addition, the grinding time is greatly shortened, the production efficiency is improved, the concentricity with high accuracy is obtained, and the high surface roughness of the roller body is obtained.

(2) In the apparatus of claim 2, even when the hardness of the roller body is low and the roller body is easily elastically deformed, the end surface of the roller body comes into contact with the end surface of the ring-shaped body provided on the center support tool, and Since the end portion is prevented from being deformed in the longitudinal direction, defective grinding is less likely to occur at the end portion of the roller body.

(3) In the grinding method of the present invention (claim 3),
In addition to high precision concentricity, high work efficiency, short grinding time, excellent roundness and high precision surface roughness.

(4) In the grinding method according to claim 4, in addition to the effect of the grinding method according to claim 3, for example, a scratch is formed on a part of the surface of the grinding wheel so that the surface of the roller body is streaked. However, even if there is, the contact position between the surface of the roller body and the surface of the grinding wheel changes, so that an elastic roller having a high surface roughness can be obtained which has no scratches on the surface of the roller body.

(5) The grinding method according to claim 5 is also the method according to claim 3.
An effect similar to that of the grinding method of No. 1 is produced.

(6) The grinding method according to claim 6 is also the method according to claim 4.
An effect similar to that of the grinding method of No. 1 is produced.

(7) In the grinding method according to the seventh aspect, similarly to the grinding by the apparatus according to the second aspect, even when the hardness of the roller main body is low and the elastic deformation easily occurs, the end portion of the roller main body during the grinding operation is Since deformation in the longitudinal direction is prevented, defective grinding is less likely to occur at the end of the roller body.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an embodiment of an elastic roller grinding device according to the present invention.

2 is a sectional view showing a part of FIG. 1 in an enlarged manner, and FIG.
2 represents a grinding device in which the adjusting grinding wheel moves, and FIG.
(b) represents a grinding apparatus of a system in which a grinding wheel moves.

FIG. 3 is a perspective view showing a developing roller which is an example of an elastic roller.

4 (a) to 4 (e) are schematic front views sequentially showing a first grinding method for an elastic roller according to the present invention.

5 (a) to 5 (f) are schematic front views sequentially showing a second method of grinding an elastic roller according to the present invention.

6 (a) to 6 (e) are schematic front views sequentially showing a third grinding method for an elastic roller according to the present invention.

7 (a) to 7 (e) are schematic front views sequentially showing a fourth grinding method for an elastic roller according to the present invention.

8A and 8B respectively show a part of a grinding apparatus according to another embodiment of the present invention, FIG. 8A is a front view showing a part in section, and FIG. 8B is a perspective view. .

FIG. 9 is a partial cross-sectional view showing an aspect in which an elastic roller is ground by a plunge-cut type cylindrical grinding device (FIG. 11).

FIG. 10 is a front view showing a conventional general traverse type cylindrical grinding device.

FIG. 11 is a front view showing a conventional general plunge cut type cylindrical grinding device.

FIG. 12 is a side view showing a conventional general centerless grinding apparatus.

[Explanation of symbols]

 1.1 'Grinding device 2 Blade 3 Adjusting grind wheel 4 Grinding grind wheel 5 Center support tool (support tool) 6.7 Annular body A Developing roller (elastic roller) B Roller body C Core bar D Center hole (rotation center hole) )

Claims (7)

[Claims] 1. A grinding device for an elastic body roller, comprising: a cylindrical roller body made of an elastic body; , With a grinding wheel on one side across the elastic roller supported on this blade, and an adjusting wheel on the other side,
At least one of a grinding wheel and an adjusting wheel is configured to be movable back and forth with respect to the elastic roller, and a core metal of the elastic roller is provided above the blade at a rotation center position of the elastic roller in a final grinding state. An elastic roller grinding device, characterized by comprising a pair of center support members that are fitted into center holes provided on both end surfaces of the elastic member and that rotatably and rotatably support the elastic roller. 2. The center support unit is integrally provided with an annular body surrounding a cored bar projecting from the roller body and having an end surface facing the end surface of the roller body.
A grinding device for the elastic roller described. 3. A grinding wheel for grinding an elastic body roller, wherein a cored bar is integrally formed by projecting a part of the cored bar to both sides at the center of a cylindrical roller body made of an elastic body. The elastic roller is placed on the blade between the adjusting wheel and the grinding wheel, and both end surfaces of the core bar of the elastic roller are located above the blade at the rotation center position in the final grinding state of the elastic roller. The center of the wheel is rotatably and detachably supported, and the adjusting grind wheel is brought into contact with the roller body of the elastic roller to rotate it. A method for grinding an elastic roller, further comprising: advancing to a surface of a roller body, and further advancing the grinding wheel to a final grinding position. 4. A grinding wheel for grinding an elastic body roller, comprising a cored roller body made of an elastic body and a cored bar integrally formed by projecting a part of the cored bar on both sides. The elastic roller is placed on the blade between the adjusting wheel and the grinding wheel, and both end surfaces of the core bar of the elastic roller are located above the blade at the rotation center position in the final grinding state of the elastic roller. The center of the wheel is rotatably and detachably supported, and the adjusting grind wheel is brought into contact with the roller body of the elastic roller to rotate it. After contacting the surface of the roller body by advancing to, the grinding wheel is further advanced to the final grinding position, on the other hand, both end surfaces of the core metal of the elastic roller at or immediately before the final grinding position of the grinding wheel. A method for grinding an elastic roller, comprising moving the grinding wheel and the adjusting wheel to one end in the width direction of the grinding wheel while supporting the center of the grinding wheel. 5. A method of grinding an elastic roller, wherein a cored bar is integrally formed by projecting a part of the cored bar to both sides at the center of a cylindrical roller main body made of an elastic body. The elastic roller is placed on the blade between the adjusting grinding wheel and the grinding wheel, and the elastic body is provided above the blade at a rotation center position in a predetermined grinding state before the final grinding state of the elastic roller. The center of both end surfaces of the core of the roller is rotatably and detachably supported, and the adjusting grind wheel is brought into contact with the roller body of the elastic roller to rotate it, and at the same time, the grinding wheel is rotated. While the roller body is brought into contact with the surface of the roller body by moving it forward relative to the roller body, the grinding wheel is further advanced to the final grinding position or the grinding position immediately before the grinding wheel, whereby the elastic roller rolls. After the concentricity between the main body of the roller and the core is released, the center support of the core of the elastic roller is released, and the grinding wheel is rotated at the final grinding position to grind the roller body or the grinding wheel. A method of grinding an elastic roller, characterized by further advancing the roller body to a final grinding position while rotating the wheel. 6. A method of grinding an elastic body roller, wherein a cored bar made of an elastic body is integrally provided with a cored bar with a part of the cored bar protruding on both sides, and grinding wheels are arranged to face each other. The elastic roller is placed on the blade between the adjusting wheel and the adjusting wheel, the adjusting wheel is tilted with respect to the elastic roller, the final grinding state of the elastic roller above the blade. The center of both end faces of the core of the elastic roller is rotatably and detachably supported at the rotation center position in a predetermined grinding state further forward, and the adjustment grinding wheel is attached to the roller body of the elastic roller. While contacting and rotating this, while advancing relative to the roller body while rotating the grinding wheel to bring it into contact with the surface of the roller body, the grinding wheel is moved to the final grinding position or immediately before it. By further advancing to the grinding position, the roller body of the elastic roller and the core metal are made concentric, then the center support of the core metal of the elastic roller is released, and the grinding wheel is moved to the final grinding position. While rotating or further advancing to the final grinding position while rotating the grinding wheel, it is possible to move the elastic roller to one end in the width direction of the grinding wheel between the grinding wheel and the adjusting wheel. A characteristic method of grinding an elastic roller. 7. The roller body is prevented from elastically deforming in the longitudinal direction by pressing the end faces on both sides of the roller body when the surface of the roller body is ground by the grinding wheel. The method for grinding an elastic roller according to any one of claims.