JPH1199451A - Rubber roller polishing machine and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber roller polishing machine capable of shortening polishing time while maintaining concentricity of a rotary shaft and a rubber material with high precision. SOLUTION: Bearing parts 31a, 31b to support both end parts of a rotary shaft 1 of a rubber roller G are provided, and a pair of rotary chucks 28a, 28b to advance and retreat in the rotary shaft direction of the rubber roller G and to rotate with the rubber roller G by making contact with and clamping the rubber roller in pressure contact from both side at the time of advancing is provided. The rubber roller G is rotated by making contact with and clamping it by these rotary chucks 28a, 28b, and an outer peripheral surface of the rubber roller G is roughly polished by a grinding wheel 18 rotating at high speed while taking much of cutting quantity. Thereafter, pressure contact clamping of the rotary chucks 28a, 28b is released, the rubber roller G is rotated while pressing the outer peripheral surface of the rubber roller G by a pressing roller 43 arranged on the opposite side of the grinding wheel 18 against the rubber roller G, and the rubber roller G is finishingly polishing in a state where the rotary shaft 1 is moved to one side of inner peripheral walls of the bearing parts 31a, 31b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing machine for a rubber roller used as a conveying roller for a magnetic tape such as an audio or a cassette tape recorder.

[0002]

2. Description of the Related Art Generally, a rubber roller G of this type is provided with a structure shown in FIG.
As shown in (1), the rotary shaft 1 and a cylindrical rubber material 2 provided around the rotary shaft 1. The rotating shaft 1 is formed of a plastic material and has a shaft portion 1 protruding from both ends in the axial direction.
a, 1b, a body 3 into which the rubber material 2 is fitted and fixed;
Flanges 4a and 4b are formed at both ends of the body 3 and regulate the positions of the upper and lower ends of the rubber material 2.

Since it is necessary to ensure the smoothness of the outer peripheral surface 2a and the concentricity with the rotating shaft 1, the rubber material 2 needs a polishing step of the outer peripheral surface 2a after being fitted and fixed to the rotating shaft 1. Conventionally, in this polishing step, a polishing apparatus as shown in FIG. 7 has been used. This polishing device,
A fixed bearing 5 that rotatably supports both ends of the rotation shaft 1 of the rubber roller G, a grindstone 8 that grinds the outer peripheral surface 2a of the rubber roller G by high-speed rotation, and a grinding stone 8 disposed on the opposite side of the rubber roller G from the grinding stone 8. And a disk-shaped copy roller 7. The rotating copy roller 7 is pressed against the outer peripheral surface 2a of the rubber roller G, and the outer peripheral surface 2a is polished with a high-speed rotating grindstone 8 while rotating the rubber roller G by the frictional force acting between them.

[0004]

In the above-described polishing apparatus, since the rotational force of the rubber roller G is given by the frictional force with the copy roller 7, when the pressing force of the copy roller 7 is weak or when the grinding wheel is used. When the frictional force with the grindstone 8 is superior to the frictional force with the copy roller 7 such as when the cutting amount of the grindstone 8 is large, there is a possibility that the outer periphery of the grindstone 8 is not sufficiently polished. On the other hand, if the pressing force of the copy roller 7 is increased to increase the frictional force with the rubber roller G, the rotating shaft 1 of the rubber roller G may be deformed between the fixed bearing 5 and the rotating shaft 1 may be deformed. There is a possibility that the sliding surface with the fixed bearing 5 may be damaged. In particular, when the rubber roller G is used as a pinch roller for conveying a magnetic tape, high-precision polishing is performed so that the concentricity between the axis of the rotating shaft 1 and the axis of the rubber material 2 is within 0.01 mm. Required. Therefore, in the related art, the pressing force of the copy roller 7 has to be suppressed at an appropriate place, and the frictional resistance with the rubber roller G is reduced by reducing the cutting amount of the grindstone 8 so that the outer peripheral polishing is performed. Therefore, there is a problem in that polishing time is required until finishing to a desired smoothness, and productivity cannot be improved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rubber roller polishing machine and a polishing method thereof capable of shortening the polishing time while maintaining the concentricity of the rotating shaft and the rubber material with high accuracy. .

[0006]

That is, in order to solve the above-mentioned problems, a rubber roller polishing machine according to claim 1 of the present invention comprises:
In a rubber roller polishing machine for polishing an outer peripheral surface of a rubber roller composed of a rotating shaft and a rubber material provided around the rotating shaft with a grindstone rotating at a high speed, a bearing portion for supporting both ends of the rotating shaft is provided, and a rubber roller is provided. A pair of rotary chucks that advance and retreat in the direction of the rotation axis and press and hold the rubber roller from both sides when moving forward, and are disposed on the opposite side of the grinding wheel with respect to the rubber roller, and press and hold the rotary chuck. And a pressing roller for applying a rotational force to the rubber roller while pressing the outer peripheral surface of the rubber roller after the release.

A method of polishing a rubber roller according to a second aspect of the present invention is a method of polishing a rubber roller in which an outer peripheral surface of a rubber roller composed of a rotating shaft and a rubber material provided therearound is polished by a high-speed rotating grindstone. A rough polishing step of supporting the rotating shaft of the rubber roller by rotating chucks disposed on both sides thereof, pressing and rotating the rubber roller by the rotating chuck, and polishing the outer peripheral surface of the rubber roller by a grindstone; After releasing the rubber roller, the rubber roller is rotated while pressing the pressing roller disposed on the side opposite to the grindstone with respect to the rubber roller against the outer peripheral surface of the rubber roller, and the finish polishing step of polishing the outer peripheral surface of the rubber roller with the grindstone. It is characterized by becoming.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a rubber roller polishing machine and a polishing method according to the present invention will be described below in detail with reference to the accompanying drawings. The rubber roller according to this embodiment includes a rotating shaft 1 and a cylindrical rubber material 2 fitted around the rotating shaft 1, similarly to the rubber roller G described with reference to FIG.
The rotating shaft 1 has a shaft portion 1 protruding at both ends in the axial direction.
a, 1b, a body 3 into which the rubber material 2 is fitted and fixed;
Flanges 4a and 4b are formed at both ends of the body 3 and regulate the positions of the upper and lower ends of the rubber material 2.

FIG. 1 and FIG. 2 show a schematic configuration of a rubber roller polishing machine according to the present invention. The rubber roller polishing machine 11 according to the present invention includes a polishing section 14 for polishing the outer peripheral surface of the rubber roller G, a chuck section 16 for pressing and holding the rubber roller G in the direction of the rotation axis 1, and a polishing section 14 for the rubber roller G. A pressing portion 17 is disposed on the opposite side and rotates while pressing the outer peripheral surface of the outer peripheral surface of the rubber roller G.

The polishing section 14 includes a disk-shaped grindstone 18, and grinds the outer peripheral surface 2a of the rubber material 2 around the grindstone 18 rotating at high speed. This grindstone 18 is fixed to the tip of a grindstone shaft 19. The grindstone shaft 19 is rotatably supported by a grindstone bearing 20, and is rotated at a high speed by a wrapping transmission device 21 composed of a belt and a pulley and a polishing unit motor 22. Further, the grinding wheel bearing 20 and the polishing section motor 22 are fixed on a movable table 23 which can move in a direction perpendicular to the axial direction of the rotating shaft 1. The moving table 23 is slidably mounted on a rail 25 fixed on the polishing base 24, and moves on the rail 25 in the longitudinal direction by rotation of a screw 27 attached to a moving table motor 26. By the rotation of the moving table motor 26 at a predetermined angle, the grindstone 18 moves to the rubber roller G side and can grind the outer peripheral surface 2a of the rubber material 2 while cutting it by a predetermined amount.

[0011] As shown in FIG.
A pair of rotary chucks 28a and 28b for pressing and holding the rubber roller G in the direction of the rotary shaft 1;
The rotating mechanism 29 includes a rotating mechanism 29 for rotating the rotating shaft 28b around the rotating shaft 1 and a chuck opening / closing mechanism 30 for moving the rotating chuck 28 forward and backward in the rotating shaft 1 direction.

As shown in FIG. 4, the rotary chucks 28a and 28b are formed of a pair of cylindrical shafts facing each other, and bearing portions 31 for supporting both side shaft portions 1a and 1b of the rotary shaft 1 are provided on the facing surfaces.
a, 31b are provided. The bearings 31a, 31b
Is an elongated hole having an inner diameter about 0.01 mm to 0.03 mm larger than the shaft diameter and deeper than the length of the shaft sections 1a and 1b so that the shaft sections 1a and 1b can be inserted. The rotation centers of the pair of rotary chucks 28a and 28b are located on a straight line, are movable forward and backward in the direction of the rotary shaft 1, and are rotatably supported by the chuck bearing 32. As shown in FIG. 4, when the rotary chucks 28a and 28b move forward, the shaft portions 1a and 1b of the rotary shaft 1 are connected to the bearing portions 31a and 3b.
1b, and presses and clamps the flanges 4a, 4b of the rotary shaft 1 on the front surfaces of the rotary chucks 28a, 28b. On the other hand, as shown in FIG. 5, when the rotary chucks 28a and 28b are retracted, the pressing of the rubber roller G is released and the shafts 1a and 1b can be taken out of the bearings 31a and 31b by further retracting.

The rotating mechanism 29 includes a chuck motor 33.
Belt pulleys provided between the chuck motor 33 and the driven shaft 34, and between the driven shaft 34 and the rotary chucks 28a and 28b. And a transmission 35 around which the chuck portion is wound. The rotation of the chuck unit motor 33 is controlled by the driven shaft 3 via the chuck unit winding transmission 35.
It is conveyed to 4. The driven shaft 34 has a wrapping transmission 35 at both ends, and the rotation of the driven shaft 34 is transmitted to the pair of rotary chucks 28a and 28b at the same rotation speed.

The chuck opening / closing mechanism 30 includes a pulse motor 3
6, a turntable 37 directly connected to a motor shaft of the pulse motor 36 which faces vertically upward, and first and second links 38a, 38b and 39a, provided between the turntable 37 and the rotary chucks 28a, 28b. 39b
Consists of One end of each of the first links 38a and 38b is connected to the turntable 37 to form a pair, and the other end is connected to the second link.
It is connected to one end of the link 39a, 39b and forms a pair. The second links 39a and 39b are connected to the first link 38.
a and 38b are connected to one end by a pair, and a central portion thereof is rotatably supported by a support base 40. The other ends of the second links 39a and 39b are provided with sliders 41a and 41b forming a sliding pair, and the sliders 41a and 41b are provided.
And the chuck opening / closing members 42a and 42b are connected in a pair. The rotary chucks 28a and 28b rotate inside the chuck opening and closing members 42a and 42b. As shown in FIG. 1, when the turntable 37 rotates by a predetermined angle according to the pulse input to the pulse motor 36, the first links 38a and 38b move to the position shown by the two-dot chain line in FIG. . The second links 39a and 39b are also the first links 38.
Along with the movement and rotation of a and 38b, the support base 40 is rotated to the position indicated by a two-dot chain line in the figure around the support base 40. The second link 39a,
With the rotation of 39b, chuck opening / closing members 42a, 42b
And the pair of rotary chucks 28a and 28b slide in the direction opposite to the direction of the rotation shaft 1. Therefore, the rotation of the pulse motor 36 allows the rotary chucks 28a and 28b to advance and retreat in the direction of the rotating shaft 1, and can press and hold or release the rubber roller G.

The rubber roller G is supplied from a supply device (not shown). At this time, the rotary chucks 28a and 28b and the grindstone 18 are respectively retracted to the positions shown by two-dot chain lines so as not to hinder the supply. Next, by the rotation of the pulse motor 36, the rotary chucks 28a and 28b advance to the position shown by the solid line, and the flanges 4a and
4b is pressed and held. After the polishing is completed, it is retracted to the position indicated by the two-dot chain line again.

The pressing portion 17 includes rotary chucks 28a, 28
b releases the pressing and holding of the rubber roller G, and then rotates the copy roller 43 while pressing the copy roller 43 against the outer peripheral surface 2a of the rubber roller G. Copy roller 43
Is fixed to the tip of a copy roller shaft 44 parallel to the rotation shaft 1 of the rubber roller G supported by the rotation chucks 28a and 28b. The copy roller shaft 44 is rotatably supported by a pressing portion bearing 46 and is directly connected to a pressing portion motor 45. The pressing unit motor 45 and the pressing unit bearing 46 are fixed on a pressing table 47. As shown in FIG. 2, the pressing table 47 has a leg 48 extending to the lower surface of the polishing base 24, and can be rotated by a pressing table bearing 49 fixed on the polishing base 24 near the center of the leg 48. Supported by On the lower surface of the polishing base 24, an air cylinder 50 which is in contact with the leg 48 and a coil spring 51 which is connected to the lower end of the leg 48 are provided. When the air cylinder 50 is operated to move the piston rod 50a to the position indicated by the solid line in the figure and press the lower part of the leg 48, the pressing table 47 retreats to the position indicated by the solid line in the figure against the spring force of the coil spring 51. The copy roller 43 moves away from the outer peripheral surface 2a of the rubber roller G. On the other hand, when the piston rod 50a is reduced, the pressing table 43 is moved to the position indicated by the two-dot chain line by the spring force of the coil spring 51, and the copy roller 43 can be brought into contact with the rubber roller G. In this state, the rotary chuck 28
When the pressing and holding of the a and 28b are released, the rubber roller G can be rotated by a frictional force while pressing the outer peripheral surface thereof. Since the pressing force of the copy roller 43 is determined by the spring force of the coil spring 51, the optimum pressing force can be easily obtained simply by changing the spring force.

FIG. 3 is a flowchart showing a polishing process of the rubber roller polishing machine according to the present invention. The polishing process includes a rough polishing process of steps S1 to S4 and a finish polishing process of steps S5 to S8.

First, the rough polishing step will be described. FIG.
As shown in FIG. 4, the rubber rollers G before polishing, which are supplied one by one to a polishing machine from a rubber roller supply device (not shown), have shaft portions 1a and 1b on both sides of the rotary shaft 1 and rotary chucks 28a and 28b. Are positioned and supported by the bearing portions 31a and 31b (step S1). Next, the rotating chuck 28
a, 28b are advanced, and the flanges 4a, 4b at both ends of the rubber roller G are pressed and clamped in the direction of the rotating shaft 1 on the front surface thereof (step S2). Then, with the rubber roller G pressed and held,
The rotation chucks 28a and 28b are rotated by the rotation mechanism 29, and the rubber rollers G are rotated together (step S).
3). Next, the grindstone 18 is gradually moved in the direction of the rubber roller G while rotating at a high speed, and the outer peripheral surface 2a of the rubber roller G is
Is roughly polished (step S4). Since the rubber roller G is strongly held between the rotary chucks 28a and 28b, the frictional force with the grindstone 18 is not superior. Therefore, it is possible to increase the cutting depth of the grindstone 18, and it is possible to greatly reduce the polishing time required for rough polishing.

It should be noted that, as shown in FIG.
The inner diameters of the shafts a and 31b are formed slightly larger than the diameters of the shaft portions 1a and 1b of the rotating shaft 1, and an appropriate gap (about 0.01 to 0.03 mm) is formed between them. Therefore, when the rubber roller G is pressed and sandwiched in the direction of the rotating shaft 1,
A shift W may occur between the rotation centers of the rotation chucks 28a and 28b and the rotation center of the rotation shaft 1. As described above, the concentricity between the rotating shaft 1 and the rubber material 2 is 0.01
In this case, a predetermined concentricity cannot be obtained when polishing is performed in this state. Therefore, after the rough polishing step, the following finish polishing step is required. In FIG. 4, the gaps are exaggerated and enlarged for easy understanding.

Next, the finish polishing step of the rubber roller G will be described with reference to steps S5 to S8 in FIG. 3 and FIG. At the same time as the completion of the rough polishing, the moving table motor 26 is stopped to stop the cutting of the grindstone 18, or the cutting amount is made very small even if not stopped. And FIG.
As shown in FIG. 7, the piston rod 50a of the air cylinder 50 is pulled in, the pressing table 47 is pushed out by the spring force of the coil spring 51, and the copy roller 43 is moved to the rubber roller G.
From the horizontal direction (step S).
5). At this time, a rotational force is applied to the copy roller 43 by the pressing unit motor 45. Immediately after the copy roller 43 is pressed against the rubber roller G, the rotating chuck 28
The pressure contact between the a and b is released by the action of the pulse motor 36, and a small thrust gap k of 0.1 mm or less is formed between the front surfaces of the rotary chucks 28a and 28b and the flanges 4a and 4b. The rubber roller G is pressed by the copy roller 43 toward the grindstone 18 with the release of the pressing and holding, and the shaft portions 1a and 1b of the rotating shaft 1 are pressed against the inner peripheral walls of the bearing portions 31a and 31b. Is formed (step S6). In this state, the copy roller 43 is rotated, and the rubber roller G is rotated by the frictional force (step S7). The rubber roller G is cut into a high-speed rotating grindstone while rotating, and the outer peripheral surface 2a is finish-polished (step S8).

Incidentally, as shown in FIG.
Rotates in a state in which the shaft portions 1a and 1b of the rotating shaft 1 are pressed against one side of the bearing portions 31a and 31b. The amount of polishing in the final polishing process is the same as that of the rotary chucks 28a and 28a in the rough polishing process shown in FIG. Since only the eccentric amount generated by the shift W between the rotation center of the rotation shaft 28b and the rotation center of the rotation shaft 1 is polished, the cutting amount of the grindstone 18 can be small,
As a result, the pressing force of the copy roller 43 can be reduced, so that the deformation of the shaft portions 1a and 1b can be extremely reduced by the pressing force of the copy roller 43 as compared with the related art. In addition, since the cutting amount of the grindstone 18 is small as described above, the polishing time required for finishing is also short.
Further, the shaft portions 1a, 1b of the rotary shaft 1 are connected to the bearing portions 31a, 31.
Since the rubber roller G is pressed against one side, there is no eccentricity at the time of rotation of the rubber roller G, and polishing can be performed with high precision.

[0022]

As described above, according to the rubber roller polisher according to the present invention, the rubber roller is provided with the bearing portions for supporting both sides of the rotating shaft of the rubber roller, and moves forward and backward in the rotating shaft direction of the rubber roller. Is provided with a pair of rotary chucks for pressing and holding, so that the rubber roller can be polished while taking a large amount of cut while being pressed and held by the rotary chuck, and the polishing time can be greatly reduced. Further, since the pressing roller for rotating the rubber roller while pressing the outer peripheral surface of the rubber roller after releasing the pressing and holding of the rotary chuck is provided, the polishing can be performed in a state where the rotating shaft of the rubber roller is moved toward one of the inner peripheral walls of the bearing portion. Polishing can be performed while maintaining the concentricity between the rotating shaft and the outer peripheral surface of the rubber material with high precision.

Further, according to the rubber roller polishing method of the present invention, a rough polishing step of polishing the outer peripheral surface of the rubber roller in a state where the rubber roller is pressed and held in the rotation axis direction by the rotary chuck, and pressing the pressing roller against the outer peripheral surface of the rubber roller. In the rough polishing process, it is possible to perform polishing while taking a large amount of infeed, and in the final polishing process, the rotating shaft and the rubber are provided in the rough polishing process. Polishing can be performed while maintaining the concentricity with the material with high precision. Therefore, by combining both polishing steps, there is an effect that highly accurate polishing can be performed in a short time.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a rubber roller polishing machine according to the present invention.

FIG. 2 is a sectional view taken along line A-A of the embodiment.

FIG. 3 is a flowchart showing a polishing process of the rubber roller polishing machine.

FIG. 4 is a sectional view showing a main part in a rough polishing step.

FIG. 5 is a cross-sectional view showing a main part in a finish polishing step.

FIG. 6 is a cross-sectional view illustrating a structure of a rubber roller.

FIG. 7 is a schematic plan view showing a conventional rubber roller polishing machine.

[Explanation of symbols]

 G Rubber roller 1 Rotary shaft 2 Rubber material 2a Outer peripheral surface 11 Rubber roller polishing machine 18 Grinding stone 28a, 28b Rotary chuck 31a, 31b Bearing unit 43 Copy roller (press roller)

Claims (2)

[Claims] 1. A rubber roller polishing machine for polishing an outer peripheral surface of a rubber roller composed of a rotating shaft and a rubber material provided around the rotating shaft with a grindstone rotating at a high speed, wherein a bearing portion supporting both ends of the rotating shaft. A pair of rotary chucks are provided and move forward and backward in the direction of the rotation axis of the rubber roller, and at the time of forward movement, press and hold the rubber roller from both sides to rotate together, and are disposed on the opposite side to the grinding wheel with respect to the rubber roller, A rubber roller polishing machine, comprising: a pressing roller for applying a rotational force to the rubber roller while pressing the outer peripheral surface of the rubber roller after releasing the pressing and holding of the rotary chuck. 2. A method for polishing a rubber roller, comprising a rotating shaft and a rubber material provided around the rotating shaft, using a grindstone that rotates at a high speed, wherein the rotating shaft of the rubber roller is disposed on both sides. A rough polishing step of supporting and rotating the rubber roller with the rotating chuck while supporting the chuck with a chuck, and polishing the outer peripheral surface of the rubber roller with a grindstone. A finishing polishing step of rotating the rubber roller while pressing the pressing roller disposed on the opposite side against the outer peripheral surface of the rubber roller, and polishing the outer peripheral surface of the rubber roller with a grindstone.