JPH018284Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention rotates a workpiece that is supported at the center between a main spindle and a tailstock spindle, and grinds the workpiece while pressing a grinding member against its outer peripheral surface. The present invention relates to such a grinding device, and particularly relates to an improvement in the drive mechanism of a grinding device that applies oscillation (vibration) along with rotation to a workpiece.

(Prior art) Traditionally, as a type of grinding device, the
As shown in Publication No. 80160, a band-shaped wrapping paper (grinding member) is fed out from a supply reel and is wrapped around a plurality of rollers, and rotated while being supported in the center between a main shaft and a tailstock shaft. A so-called paper wrap device is well known in which a workpiece is ground by attaching the above-mentioned paper to the workpiece and pressing it against the workpiece using a pad.

It is also known to process a workpiece while oscillating it in the axial direction during grinding, as shown in Japanese Unexamined Patent Publication No. 139871/1983.

In such paper wrap machines, etc., in order to make the surface roughness of the ground surface of the workpiece uniform, the workpiece is rotated and vibrated back and forth in the axial direction during the grinding process to perform so-called crosshatch grinding on the ground surface of the workpiece. Thereafter, in order to smooth the ground surface of the crosshatch-ground workpiece, a crosshatch grinding system is employed in which crosshatch removal grinding is performed in which the workpiece is ground for a certain period of time while the vibration of the workpiece is stopped. When performing crosshatch grinding, a workpiece support center provided on the main spindle or tailstock shaft is usually provided so as to be slidable relative to the main spindle or tailstock spindle.
Crosshatch grinding is performed by vibrating the center back and forth, and crosshatch removal is performed by stopping and holding the center.

By the way, in a grinding device equipped with such a crosshatch grinding system, when a workpiece is attached to and removed from the main spindle and tailstock spindle before and after grinding, the center is moved back and forth with a stroke larger than the longitudinal vibration stroke during grinding. Requires a mechanism to be moved.

Conventionally, the driving source for moving the center over a large stroke for attaching and detaching the workpiece is workpiece grinding (crosshatch grinding and crosshatch removal grinding).
It is provided separately from the drive source that vibrates the center in small strokes for the purpose of
There was a tendency for the number of drive sources to increase and the device to become complicated.

(Purpose of the invention) The purpose of the invention is to use a single drive source to perform the above-mentioned large-stroke movement of the center for attaching and detaching the workpiece and small-stroke vibration of the center for crosshatch grinding of the workpiece. west,
Therefore, it is an object of the present invention to simplify the configuration of a grinding device having a crosshatch grinding system.

(Structure of the invention) In order to achieve the above object, the solution means of the invention is a workpiece support provided on either the main spindle or the tailstock spindle, which supports the workpiece in the center and moves it back and forth in the axial direction. The center is linked with a cam plate formed by a workpiece loading/unloading cam part that moves the center with a large stroke when loading and unloading a workpiece, and an oscillating cam part that vibrates with a small stroke when grinding a workpiece, and the cam plate is driven. It is designed to be rotated by a device. That is, by this, the movement pattern of the center is recorded on the cam plate in advance, and the movement pattern is reproduced by rotation of the cam plate to move the center.

(Effect of the invention) Therefore, according to the invention, the center of the main shaft or tailstock shaft that supports the workpiece in the center and moves it in the axial direction moves the center of the main shaft or tailstock shaft for large strokes for loading and unloading the workpiece and for moving the workpiece in the axial direction as the cam plate rotates. Since it is driven by any of the small stroke vibrations for grinding, only the cam plate drive device is required as a drive source for the center, and the configuration of a grinding machine having a crosshatch grinding system can therefore be simplified.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a paper wrapping device A. The paper wrapping device A is installed in a finishing line for engine camshafts, and rotates a camshaft as a workpiece W to cover the outer peripheral surface of its journal part. By pressing a wrapping paper P (grinding member) against the surface of the journal, the outer circumferential surface of the journal portion is ground and its surface is finished. In FIG. 1, reference numeral 1 denotes a fixed frame disposed above a line conveyor (not shown) of the finishing line, and a pair of opposing sandwiching members 2, 2 are provided at the bottom of the fixed frame 1. are supported by support pins 3, 3 so as to be able to swing freely in a plane along the plane of the drawing, and the lower part of each clamping member 2 hangs below the fixed frame 1 (towards the line conveyor). Pressing pads 4 are attached to opposing surfaces of the pressing pads 4, and pressing portions 4a, 4a recessed in the same shape as the ground surface of the workpiece W, that is, the outer circumferential surface of the journal portion of the camshaft, are attached to the opposing surfaces of the pressing pads 4. It is formed.

On the other hand, a pad opening/closing cylinder 5 extending in the vertical direction is attached to the upper part of the fixed frame 1, and the lower end of the piston rod 5a of the cylinder 5 is guided by two guide rods 6, 6 supported by the frame 1. The horizontal member 7 to be fixed is fixed,
A swinging member 9 is connected to the center of the horizontal member 7 via a pin 8, and the left and right ends of the swinging member 9 are connected to the sandwiching member via link arms 10, respectively. It is connected to the upper part of the back of 2,2. Then, by telescopically operating the pad opening/closing cylinder 5 and vertically moving the horizontal member 7 and the swinging member 9, the sandwiching members 2, 2 are caused to swing in opposite directions around the support pins 3, 3, respectively. The lower pressing pads 4, 4 are moved toward and away from each other to open and close.

A reel receiving bracket 11 is attached to one side of the fixed frame 1 (the right side in the figure), and an unused band-shaped wrapping paper P is placed on the bracket 11 with its abrasive surface P ₁ facing inside. A supply reel 12 formed by winding the supply reel 12 in such a manner as shown in FIG.

In addition, the fixed frame 1 and each sandwiching member 2
At the bottom, there are first to twelfth holes for guiding the paper P fed out from the supply reel 12.
A plurality of rollers 13 to 24 are arranged such that their rotational axes are parallel to the rotational axis direction of the workpiece W, and each paper guide surface is included in a plane passing through the grinding surface of the workpiece W and the supply reel 12. It is arranged and supported so that the Said second roller 1
4 is urged by a spring 25 so that its outer peripheral surface (paper guide surface) comes into pressure contact with the outer peripheral surfaces of the first and second rollers 13 and 15, and this urging force causes the rollers 13 and 14 to By clamping the paper P between the rollers 14 and 15, braking resistance is applied to the paper P against paper feeding, and the tension force is ensured. Further, the fourth and fifth rollers 16, 17
There are receiving members 26, 26 on the fixed frame 1 between the 11th and 12th rollers 23, 24, respectively.
are arranged and attached so that the paper P passes through the upper side thereof, and a presser rod 27 connected to a mini-cylinder 28 and extending in the vertical direction is slidably supported on the frame 1 above each receiving member 26. Then, the mini-cylinder 28 is operated to lower the presser rod 27, and the lower end surface of the presser rod 27 is pressed against the upper surface of the receiving member 26, thereby locking and fixing the paper P located between the two surfaces, whereby the fourth and fifth rollers 16, This is to prevent the paper P between the rollers 17 and the eleventh and twelfth rollers 23 and 24 from sagging.

The eighth roller 20 is attached to the fixed frame 1 above the workpiece W, and is used to change the direction of the paper P vertically above the workpiece W. Further, the seventh and ninth rollers 19, 21
are attached to opposing surfaces of the lower portions of the sandwiching members 2, 2, respectively. Furthermore, the sixth and
10 The rollers 18 and 22 are supported by swing levers 29 and 2 that are swingably supported on the back side of the lower part of the sandwiching members 2 and 2.
9, and the other end of the swing lever 29, 29 and the clamping member 2, 2 are supported by a tension spring 3.
0, 30 are latched, and the spring force of the tension springs 30, 30 causes the swing levers 29,
29 is rotated to apply a certain tension force to the paper P, and when the workpiece W is not between the pressing parts 4a, 4a of the pressing pads 4, 4, the paper P linearly moves on the pressing parts 4a, 4a. This suppresses the loosening of the paper P caused by a short circuit between the work W and the pressing parts 4a of the pressing pads 4,
When the paper P is between the pressing parts 4a, 4
The increase in tension force of the paper P caused by curving along the direction a is absorbed and alleviated.

After the paper P fed out from the supply reel 12 is passed around the first to twelfth rollers 13 to 24 in order and the rotating workpiece W is placed between the open pressing pads 4 and 4, the pressing pad is 4, 4 are closed by the operation of the pad opening/closing cylinder 5, and the abrasive surface _P1 of the paper P is pressed against the grinding surface of the workpiece W, thereby forming a paper wrap device A that grinds the workpiece W. has been done. Note that 31 is a paper remaining amount detection device that detects the remaining amount of paper P wound on the supply reel 12; A limit switch for detecting paper P, which has a detection roller 33 arranged therein, detects the paper P being cut; 34 is a pair of rollers 35, 3 which pinch the used side portion of the paper P during the grinding work of the workpiece W;
6 is a paper feeding device for feeding the paper P by a fixed length; 37 is a cutter for cutting the used paper P; and 38 is a storage box for storing the paper P cut by the cutter 37.

On both sides of the line conveyor, a main shaft 50 and a tailstock shaft (not shown) as shown in FIG. 2 for centrally supporting the work W in a horizontal state are spaced apart from each other by a predetermined distance and are opposed to each other above the conveyor. It is arranged so that

That is, the main spindle 50 is provided on the upper surface of a headstock 51 installed on the side of the conveyor, as shown in FIG. The main shaft 50 is shown in FIGS.
As shown in enlarged detail in the figure, a cylindrical rotating member is rotatably supported by a bearing member 52 fixed to a headstock 51 via bearings 53, 53, . . . and has a center hole 54a penetrating in the axial direction. 54, and a front end portion (tailstock shaft side end portion) which is fitted into the center hole 54a of the rotary member 54 by a key 55 so as to be slidable but not rotatable by a predetermined stroke with respect to the rotary member 54. Tapered center hole 56 (left end in the figure)
a rod-shaped sliding member 56, which is press-fitted into a tapered center hole 56a of the sliding member 56,
A center 57 for supporting the workpiece, the tip of which is formed into a conical shape that can fit into the center hole _W1 on the end surface of the workpiece W.
is rotatably attached to the front end of the sliding member 56, rotatably and slidably fitted to the front end of the rotating member 54, and passes through the conical tip of the center 57. center hole 5
8a as a main component. A pulley 59 is attached to the rear end of the rotating member 54, and the pulley 59 is drivingly connected to a main shaft drive motor 61 provided on the headstock 51 and capable of rotating in forward and reverse directions via a driving V-belt 60. , the rotating member 54 of the main shaft 50 and the rotating member 5 are rotated by the operation of the main shaft drive motor 61.
A sliding member 56, which is locked to 4, is rotated integrally with the sliding member 56.

Further, a disk-shaped first guide member 62 is rotatably fitted to the rear end of the sliding member 56 through a thrust bearing (not shown), and A disk-shaped second guide member 63 is fixed to the rear end edge separated by a predetermined distance,
A guide groove 64 is formed between the guide members 62 and 63. A support shaft 65 extending in the horizontal direction is provided on the upper surface of the headstock 51 below the guide groove 64.
A swing arm 66 is fixed to one end of the support shaft 65, and a guide roller 67 that is rotatably fitted into the guide groove 64 is supported at the upper end of the swing arm 66. There is. On the other hand, the support shaft 65
A swing lever 68 extending diagonally upward toward the rear is fixed to the other end, and the swing lever 68 is configured to move the center 57 and the sliding member 56 backward by the force of a spring (not shown). is energized by A cam follower roller 69 is rotatably supported at the tip of the swing lever 68 in a vertical plane. Also, the headstock 51 on the rear side of the support shaft 65
On the upper surface, a cam plate 70 is fixed to a rotating shaft 71 and supported rotatably in a vertical plane, and on the outer circumferential surface of the cam plate 70, there is a large piece on which the cam follower roller 69 abuts and rolls. A workpiece attachment/detachment cam portion 70a consisting of a concave portion, an oscillating cam portion 70b consisting of a plurality of (seven in the figure) concavo-convex portions, and a circular arc portion 70c having the same radius are formed, and the cam plate 70 is rotated counterclockwise in the figure. By rotating the swinging lever 68 and the swinging arm 66, which are linked to the cam plate 70 via the cam follower roller 69, around the support shaft 65, the sliding member 56 of the main shaft 50 and its tip are rotated. When the cam follower roller 69 comes into contact with the workpiece attachment/detachment cam part 70a and rolls, the center 57 is advanced and retreated with a large stroke to make the workpiece W removable, and the oscillating cam part When it comes into contact with the arc portion 70b and rolls, the center 57 is vibrated with a small stroke to make the workpiece W ready for crosshatch grinding, and when it comes into contact with the arcuate portion 70c and rolls, the center 57 is kept stationary to crosshatch the workpiece W. It is configured to be in a state where it can be removed and ground.

Further, the cam plate 7 is provided at the bottom of the headstock 51.
Cam plate drive motor 72 for rotationally driving 0
and a reducer 73 which is drivingly connected to the motor 72 and reduces the rotational speed of the motor 72, a sprocket 74 is attached to the output shaft 73a of the reducer 73, and the sprocket 74 and the cam plate 70 A transmission chain 76 is stretched between a sprocket 75 fixed to a rotating shaft 71 of the cam plate 70, and the rotational output of the cam plate drive motor 72 is transmitted to the cam plate 70 while being decelerated by a reducer 73. The plate 70 is rotated at a reduced speed. By controlling the operation of the cam plate drive motor 72, the cam follower roller 69 of the cam plate 70 is moved to the workpiece attachment/detachment cam portion 70a.
When it comes into contact with the center rearward end position R, which is the bottom position of the recess, and the first and second center forward end positions F ₁ and F ₂ , which are the front and rear end positions of the oscillating cam part 70b and the circular arc part 70c in the rotational direction, respectively. Controlled to stop rotating.

Further, an engagement plate 78 having an engagement notch 77 is integrally fixed to the outer peripheral surface of the covering member 58 of the main shaft 50. On the other hand, on the upper surface of the headstock 51, a covering member 58 is provided at a portion corresponding to the engagement plate 78 in the front and back.
A regulating device 79 for locking and regulating the rotation of the device is attached, and the regulating device 79 has a regulating pin 79 that can be raised and lowered.
a, and by raising the regulating pin 79a and engaging its tip with the engagement notch 77 of the engagement plate 78, the rotation of the covering member 58 is regulated.

Further, as shown in FIGS. 4 and 5, on the outer circumferential surface of the covering member 58, a hole is inserted between the inside and outside of the covering member 58 at a certain angle (90° in the figure) in the circumferential direction from the engaging plate 78. A locking pin 81 having a locking claw portion 81a at the tip (inner end of the covering member 58) is slidably fitted into the through hole 80. A spring 83 biases the locking pin 81 in a direction toward the rotating member 54 inside the covering member 58 between the back and a spring receiving member 82 fixed to the outer peripheral surface of the covering member 58 so as to cover the through hole 80. has been reduced. On the other hand, on the outer circumferential surface of the front end of the rotating member 54, there is an engagement groove 84 extending in the front-rear direction that can be engaged with the locking claw portion 81a at the tip of the locking pin 81.
formed over a length corresponding to the maximum sliding stroke of the sliding member 56 (covering member 58) against the
The wall portion of the engaging groove 84 on the front side of the rotating member 54 in the normal rotation direction (direction indicated by the arrow in FIG. 4) is cut out and provided on an inclined surface, and when the rotating member 54 rotates normally, the engaging groove 84 By engaging the locking pin 81 biased by a spring 83, the covering member 58 is driven to rotate forwardly together with the rotating member 54, and when the rotating member 54 rotates in reverse, the locking pin 81 engages with the engaging groove 84. The cover member 58 is pushed back by the inclined surface and disengaged from the engagement groove 84, thereby allowing the covering member 58 to rotate relative to the rotating member 54.

Furthermore, a key member fitting portion 85 is formed in the front end wall portion of the covering member 58 at a portion diametrically opposed to the engaging plate 78 by cutting the front end wall portion radially outward from the center hole 58a. A substantially L-shaped key member 86 is fitted into the key member fitting portion 85 and is supported by a support pin 87 so as to be swingable. A covering member 5 is attached to the front end of the key member 86.
A half-moon key 86a is integrally formed on the central side surface of the covering member 58 at the front end, and can be fitted into a key groove _W2 bored in the outer circumferential surface of the end of the workpiece W. Further, a rod fitting hole 88 extending in the front-rear direction is formed in the outer peripheral wall of the covering member 58 corresponding to the rear side of the rear end of the key member 86. A push rod 89 for pushing the rod is slidably fitted, and the push rod 89 is connected to the rear end of the rod fitting hole 8.
The key member 86 is rotated counterclockwise in FIG. 3 by the forward bias of the push rod 89. The half-moon key 86a is held in engagement with the keyway _W2 of the workpiece W. Incidentally, although not shown in the drawings, there is a discarded boss protruding at a predetermined position on the outer peripheral surface of the workpiece W, which is used for positioning only when machining the workpiece W, and the discarded boss and the keyway _W2 are circular. It is provided so as to form a certain angle in the circumferential direction, and the main shaft 5
0 and the workpiece W supported by the tailstock shaft rotates at a low speed, and when the waste boss comes into contact with a predetermined stopper (not shown) placed around the workpiece W and the workpiece W stops, the keyway _W2 is It is set at the upper end position, that is, at a position corresponding to the half-moon key 86a of the key member 86. In addition, the main shaft 50
To do this, push the rear end of the key member 86 backward against the biasing force of the spring 90 to rotate the key member 86 in the clockwise direction in FIG. A release mechanism is provided to release the engagement with the groove _W2 .

On the other hand, the tailstock shaft has a center opposite to the center 57 of the main spindle 50, and the center is arranged so that the workpiece W can be held between them even if the center 57 of the main spindle 50 moves back and forth. It is provided to move back and forth following the back and forth movement of the center 57.

Next, to explain the operation of the above embodiment,
At the start of operation, the regulating pin 79a rises due to the operation of the regulating device 79 on the headstock 51 and engages with the engagement plate 78 of the covering member 58 of the main shaft 50, and this engagement causes the covering member 58 to move upward at its front end. key member 8
6 is locked and fixed in the upper end position. Further, the key member 86 is held in a released state in which it is rotated clockwise in FIG. 3 by a release mechanism. Furthermore, the cam plate 7 behind the main shaft 50
0 is stopped so that the contact position with the cam follower roller 69 is at the center rearward end position R,
The sliding member 56 and the center 57 at its body end are stopped at the retracted end position. Further, the pressing pads 4, 4 for pressing the paper P against the workpiece W are in an open state due to the contraction operation of the pad opening/closing cylinder 5.

In this state, the workpiece W (camshaft) conveyed by the line conveyor is moved to the height position of the main spindle 50 and the tailstock spindle by an appropriate receiver (not shown), that is, to the pressing pads 4, 4. When the cam plate 70 is lifted to the position between the parts 4a and 4a, the cam plate 70 is rotated counterclockwise in FIG. R to the first center forward end position _F1 ,
By this, the sliding member 56 and the center 57
moves forward, and the workpiece W is centrally supported between the center 57 and the center of the tailstock shaft.

Next, after the receiver is lowered, the keyway indexing of the workpiece W is performed. This keyway indexing is started by operating the main shaft drive motor 61 to reversely rotate the main shaft 50 at a low speed. That is, since the rotation of the covering member 58 is restricted by the regulating device 79, as the main shaft 50 rotates in the opposite direction, the rotating member 54, the sliding member 56 locked to the rotating member 54, and the center Only the center 57 rotates in the reverse direction, and the workpiece W supported by the center 57 also rotates accordingly due to the contact resistance between the two.
Then, the workpiece W stops rotating due to contact with the stopper of the disposable boss, and the keyway of the workpiece W is stopped.
When W ₂ is positioned at the upper end position, only the rotating member 54, sliding member 56, and center 57 rotate at low speed in reverse, and the locking pin 81 of the covering member 58 engages with the engagement groove 84 of the rotating member 54. In this state, the main shaft 50 stops rotating, and keyway indexing of the workpiece W is completed.

Thereafter, when the release mechanism stops operating, the key member 86 is rotated counterclockwise in FIG. 3 by the force of the spring 90, and the half-moon key 8
6a is engaged with the keyway _W2 of the workpiece W corresponding thereto.

At this time, since the key member 86 is engaged after the key groove W ₂ of the work W is positioned at the upper end position, the half-moon key 86a of the key member 86 is pressed against the outer circumferential surface of the end of the work W by the biasing force of the spring 90. The quality of the workpiece W can be improved without damaging the outer circumferential surface of the workpiece W unlike when keyway indexing is performed by rotating the workpiece W while making contact with the workpiece W.

Next, the regulating pin 79a of the regulating device 79 is lowered to release the covering member 58, and the main shaft 50 is rotated at high speed by the operation of the main shaft drive motor 61 (for example, 200 rotations per minute, at a grinding speed of 20 m/min).
), the work W integrally connected to the rotating member 54 via the locking pin 81, the cover member 58, and the key member 86 also rotates at high speed. After the workpiece W starts to rotate at high speed, each mini-cylinder 28 operates to lock and fix the paper P at two locations, and in this state, the pad opening/closing cylinder 5 is extended to close both pressing pads 4, 4, thereby closing the workpiece. The abrasive surface _P1 of the paper P is pressed against the abrasive surface of the W from both sides. Further, as the paper P is pressed, the cam plate 70 is rotated by the operation of the cam plate drive motor 72, and the contact position with the cam follower roller 69 changes from the first center forward end plate _F1 to the second center forward end plate F1. end position
Changes to F ₂ . During this time, first, the cam follower roller 69 rolls on the oscillating cam portion 70b of the cam plate 70, causing the oscillating ray 68 and the oscillating arm 6 to rotate.
6, and the sliding member 56 of the main shaft 50 is connected to the swing arm 66 via a guide roller 67.
And the center 57 swings back and forth, and the center 57
The work W supported by is vibrated back and forth. That is, the paper P is pressed against the work W while rotating and vibrating in the axial direction, thereby performing crosshatch grinding on the work W. The frequency of this workpiece W is approximately 30 reciprocations per minute.

Subsequently, the cam follower roller 69 rolls on the arcuate portion 70c of the cam plate 70 to the center 57.
The forward and backward movement of the workpiece W is stopped, and as a result, the workpiece W
is ground for a predetermined period of time while performing only rotational movement to perform crosshatch removal grinding, and the ground surface of the crosshatch-ground workpiece W is smoothed.

After this crosshatch removal grinding is completed, the contact position of the cam plate 70 with the cam follower roller 69 is
When the position _F2 is reached, the main shaft 50 stops rotating, and the pressing pads 4, 4 are opened by the contraction operation of the pad opening/closing cylinder 5. After this, the main shaft 50 is rotated in the reverse direction, this time at a low speed, to index the main shaft to a fixed position. That is, the main shaft 50 rotates at a low speed until the engagement plate 78 of the covering member 58 moves to the lower end position, and then stops after reaching the lower end position. After this stop, the regulating pin 79a of the regulating device 79 rises and engages with the engagement notch 77 of the corresponding engagement plate 78, whereby the covering member 58 is again locked and fixed in a non-rotatable manner. . Next, the release mechanism is operated to release the engagement between the half-moon key 86a of the key member 86 and the keyway _W2 of the workpiece W, and then the receiver rises to support the workpiece W. Thereafter, the cam plate 70 rotates and its contact position with the cam follower roller 69 is changed from the second center forward end position _F2 to the center backward end position R, thereby causing the sliding member of the main shaft 50 to 56, the center 57 and the covering member 58 move back to release the workpiece W from the center 57. After that, the receiver lowers and returns the workpiece W onto the line conveyor. As described above, the grinding process for one workpiece W is completed, and the same steps as described above are repeated for each workpiece W thereafter.

Therefore, in this case, the sliding member 5 of the main shaft 60
6. The center 57 and the covering member 58 are connected to the cam plate 70
Since the cam plate 70 is linked to the cam plate 70 and driven back and forth as the cam plate 70 rotates, the center 57 is vibrated with a driving force that moves the center 57 etc. forward and backward with a large stroke for attaching and detaching the workpiece W, and with a small stroke for crosshatch grinding. The driving force can be provided by one cam plate drive motor 72, and therefore the paper wrapping device A
The device configuration can be simplified.

The present invention is not limited to the above-mentioned embodiment, but includes various modifications. For example, in the above-mentioned embodiment, the cam portions 70a and 70b are formed on the outer peripheral surface of the cam plate 70. A cam portion consisting of a cam groove may be formed on the side surface, which has the advantage that a spring for biasing the center 57 and the like rearward can be omitted.

Further, in the above embodiment, the main shaft 50 and the cam plate 70
Although these are linked via the swing arm 66 and the swing lever 68, they may be linked directly, and the device configuration can be further simplified.

Furthermore, in the above embodiment, the center 57 of the main spindle 60 is used as the center that is driven by the cam plate 70 and moves back and forth due to vibrations during attachment/detachment and grinding of the workpiece W, but it may also be the center of the tailstock spindle. The same effects as in the embodiment can be achieved.

Furthermore, in the above embodiment, a case is shown in which the paper wrap device A is used for grinding an engine camshaft, but in the present invention, the workpiece is supported centrally by a main spindle and a tailstock spindle for grinding. It goes without saying that the present invention can also be applied to various types of grinding devices.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is an overall front view of the paper wrapping device, Figure 2 is a side view of the same main part, Figure 3 is an enlarged longitudinal sectional view of the main shaft, Figure 4 is a view taken in the direction of Figure 3, and Figure 5 is Figure 4. FIG. A... Paper wrapping device, 4... Pressing pad, 4a... Pressing part, 5... Pad opening/closing cylinder, 12... Supply reel, 13-24... Roller, 34... Paper feeding device, 37... cutter, 50... main shaft, 51... headstock, 52... bearing member, 54... rotating member, 56... sliding member,
57... Center, 58... Covering member, 61... Main shaft drive motor, 64... Guide groove, 66... Swinging arm, 67... Guide roller, 68... Swinging lever, 69... Cam follower roller , 70... cam plate, 70a... cam part for attaching and detaching the workpiece, 70b...
...Oscillating cam portion, 72...Cam plate drive motor, 78...Engagement plate, 79...Regulation device, 81...
... Locking pin, 84 ... Engagement groove, 86 ... Key member, P ... Wrapping paper, W ... Work (camshaft, W ₁ ... Center hole, W ₂ ... Keyway.

Claims (1)

[Scope of utility model registration request] A workpiece is centrally supported between a main shaft rotationally driven by a main shaft drive device and a tailstock shaft facing the main shaft, and the workpiece is rotated by the operation of the main shaft drive device to grind a grinding member on the outer peripheral surface of the workpiece. In a grinding device that grinds a workpiece by pressing the workpiece, the workpiece support center of either the main spindle or the tailstock spindle is provided to be slidable relative to the main spindle or the tailstock spindle, and the other A workpiece support center is provided to be movable following the movement of the one workpiece support center, and is further linked to the one workpiece support center, and is used for workpiece attachment/detachment in which the center advances and retreats with a large stroke when loading and unloading the workpiece. A grinding device comprising: a cam plate having a cam plate formed thereon with an oscillating cam portion that moves forward and backward in small strokes to vibrate during grinding of a workpiece; and a cam plate drive device that rotationally drives the cam plate. .