JP3290217B2 - Machine tool indexing device using one-way clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a one-way clutch having a control mechanism which can change between a state where rotation can freely rotate without transmitting driving force in both directions and a state where rotation can be transmitted only in one direction. And an indexing device for a machine tool capable of fine reverse rotation of a spindle.

[0002]

2. Description of the Related Art As is well known, bearings are used for rotating parts of various mechanical structures, and allow free rotation in both directions. On the other hand, the clutch can selectively transmit the driving force from the rotating body that applies the driving force to the rotating body that receives the driving force, and the one-way clutch always transmits the driving force only in one direction. Driving force can be transmitted, and free rotation can be performed in the opposite direction. A conventional mechanical one-way clutch forms an inclined cam surface between an inner ring and an outer ring, and accommodates a roller in the inclined cam surface. To engage the outer ring and the inner ring, thereby connecting the outer ring and the inner ring by a wedge action, preventing the relative rotation of the two and transmitting the driving force between the outer ring and the inner ring. Then, with respect to the rotation in the opposite direction, the roller moves in the direction of the deep portion of the cam surface to release the engagement between the outer ring and the inner ring, thereby allowing relative free rotation. Therefore, the conventional one-way clutch is free to rotate in one direction, and is in a state in which transmission or rotation of the driving force is blocked for rotation in the other one direction, and free rotation in any direction. Or, it was not possible to selectively transmit the driving force.

[0003] That is, the conventional one-way clutch is (1)
A change from a state where rotation is free in both directions to a state where drive force can be transmitted in both directions, (2) a change from a state where rotation is free in both directions to a state where free rotation is allowed in only one direction, and (3) a change in both directions It does not have a function that enables a change from a state in which driving force can be transmitted to a state in which free rotation is allowed in only one direction, and a change in the opposite direction. Conventionally, if these functions are to be achieved with a mechanical structure, the structure must be very complicated, combining multiple components such as bearings and clutches. There were various inconveniences, such as high cost.

On the other hand, among the conventional indexing devices for machine tools, those in which the indexing master has a notch formed on the outer periphery thereof detect the notching teeth of the indexing master attached to the main shaft with a detector. By controlling the motor that drives the spindle to rotate, the workpiece is fed by rotating the spindle by a predetermined index angle. However, in this case, since the spindle is driven by the motor, it is difficult to accurately stop the rotation of the spindle at the index angle due to the accuracy of the detector, the resolution of the motor, and the like. As a result, there is a problem that an error occurs in the feeding of the work and precision processing cannot be performed. Therefore, conventionally, there is provided a stopper claw that meshes with the cutting teeth of the indexing master to prevent the indexing master from rotating in the reverse direction, and based on a state in which the stopper claw is engaged with the cutting teeth of the indexing master. The spindle is rotated, and after one pitch feed rotation, the spindle is reversely rotated until it engages with the stopper claw, thereby returning and correcting the overrun and feeding the workpiece at an accurate indexing pitch.

However, conventionally, there has not been provided any means for automatically and automatically adjusting the feed of the overrun, and in a precision machining apparatus, the rotation of the index master causes the index master to overrun. Correction is performed by manually rotating the main shaft reversely by a small gap between the tip of the stopper claw and the notch, and engaging the stopper claw with the notch. Therefore, work efficiency is poor,
In addition, there is a problem that a processing cost is increased, such as a need for a skilled worker.

[0006]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the conventional one-way clutch and the indexing device for a machine tool. In order to provide a one-way clutch that can be arbitrarily switched between a state in which free rotation can be smoothly performed and a state in which free rotation cannot be performed in one direction, and using the one-way clutch in an indexing device of a machine tool. To provide a machine tool indexing device capable of automatically correcting an overrun during feed rotation of a spindle to perform accurate indexing and efficiently perform precise machining even for a non-skilled operator. Aim.

[0007]

In order to solve the above-mentioned problems, the present inventor, in the course of various researches on an indexing device for a machine tool, has a method in which a one-way clutch is freely and smoothly free in both bearings at a given point in time. Invented a one-way clutch that can be controlled to switch freely between a state in which it can rotate and a state in which it cannot rotate freely in one direction, and the gap between the cutting teeth of the indexing master and the stopper claw caused by overrunning of the spindle in the indexing device. The inventor has learned that the one-way clutch can be applied as a means for rotating the indexing master (main shaft) by an amount corresponding to the amount of rotation, and has arrived at the present invention.

That is, the one-way clutch according to the indexing device for a machine tool according to the present invention includes a radial direction formed on one of an inner ring, an outer ring fitted to an outer peripheral portion of the inner ring, and an outer peripheral surface of the inner ring or an inner peripheral surface of the outer ring. A rolling surface which is formed on the cam surface so as to be movable to a meshable position and a non-meshable position meshing between the outer ring and the inner ring, and meshes with the meshable position of the rolling member. And a control plate for controlling the movement to the impossible position.

In the indexing device for a machine tool according to the present invention, the inner ring of the one-way clutch and the control plate are provided directly or indirectly on the spindle to which the indexing master is attached, and the control pin is provided on the inner ring. And the control pin is provided so as to move along the main shaft while twisting with respect to the control plate, and the control pin further moves after moving to a position where the rolling elements can engage with each other, and the one-way clutch operates to operate the main shaft. Can be finely rotated in the reverse direction. The indexing device can be applied to a machine tool such as a grinding machine.

[0010]

When the control plate is rotated, the rolling element control surface of the rolling element control recess formed on the control plate engages with the roller,
The roller can be moved along a cam surface formed on the outer ring or the inner ring. Therefore, if the roller is moved in the direction where the cam surface becomes shallower, the one-way clutch will be engaged, and the outer ring and the inner ring will be integrated in the direction in which the roller meshes with the inner ring and the outer ring and acts as a wedge. Thus, for example, a rotational force can be transmitted from the inner ring to the outer ring. If the outer wheel is fixed, the inner wheel is braked by the outer wheel, and rotation in this direction is prevented. Also,
Conversely, by moving the rollers in the depth direction of the cam surface, the wedge action of the rollers in either direction is eliminated, and the outer ring and the inner ring are relatively free to rotate, in which case they merely function as bearings It is. Therefore, by rotating the control plate arbitrarily, the function as a one-way clutch or the function as a bearing can be selected and switched at any time.

On the other hand, the indexing device for a machine tool to which the above-described one-way clutch is applied operates as follows. The spindle is driven by the spindle drive mechanism when machining at the indexing position of the workpiece is completed, and rotates by a predetermined angle according to the pitch of the cutting teeth of the indexing master attached to the spindle,
Rotate the workpiece to the next processing position. At that time, the indexing teeth of the indexing master are detected, and the spindle drive motor is controlled by the detection signal, and at the same time when the rotation of the spindle is completed, the control pin of the one-way clutch is guided to a spiral groove formed in the spindle. The one-way clutch moves the outer ring and the inner ring in a connected state, and the control pin still moves to apply a rotational force in the return direction to the main shaft until the notch teeth engage the stopper pawl. The main shaft rotates in reverse. Therefore, overrun of the spindle is corrected, accurate positioning can be performed, and precision processing can be performed.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 show an embodiment of the one-way clutch of the present invention. The one-way clutch according to the present embodiment includes a combination of an inner ring 1, a control plate 2, and an outer ring 3. As shown in FIG. 4, the inner ring 1 has a control plate fitting groove 6 in which a control plate 2 is rotatably fitted in a central portion of a cylindrical body having a shaft hole 5, and sandwiches the control plate fitting groove. A cam surface 8 cut diagonally inward from the outer peripheral surface is formed on the disk portions 7 on both sides. Although one cam surface is possible, a plurality of cam surfaces are preferably formed at an equal pitch from the viewpoint of balance. In the present embodiment, six cam surfaces are formed at an equal pitch. An inner ring-side control hole 9 is formed in a side portion of each of the disk portions 7, 7, and a control pin 26 provided in the slide bush body 25 is formed.
Can be inserted. Reference numeral 10 denotes a control spring guide, which winds and supports the control spring 11. One end of the control spring is fixed to a fixing pin 12 provided to project from the side surface of the disk portion, and the other end passes through the long pin fitting hole 24 of the control plate 2 and the long pin control hole 13 of the disk portion 7 to form a circle. A long pin 14 protruding from the side of the plate portion is engaged, and this pin is
In the clockwise (clockwise) direction. Fifteen
Is a roller provided between the cam surfaces of both disk portions, and is urged to move on the cam surface toward the outer peripheral portion by a compression spring 16 provided at the deepest portion of the cam surface 8.

The control plate 2 is best shown in FIG. The shaft portion has a shaft hole 20 that loosely fits into the control plate fitting groove 6 of the inner ring 1, and the outer peripheral portion has a roller end face corresponding to the cam surface 8 formed on the outer peripheral portion of the disk portion. A roller control recess 22 serving as a control surface 21 is formed. Reference numeral 23 denotes a control plate side control hole, through which the control pin 26 can pass. In the present embodiment, the rolling element control unit is configured by the roller control concave portion, but is not necessarily limited to the concave portion, and may be configured as a roller control convex portion. The outer race 3 is formed in a cylindrical shape having an inner diameter that allows the inner race 1 and the control plate 2 to fit and rotate freely, and is usually fixed to a fixed object of the structure so as not to rotate freely.

Further, the slide bush body 25 is
2 and 6, a bush portion 27 that fits on a rotating shaft (not shown) and slides in the axial direction and a flange portion 28 formed on the outer periphery of the bush portion are formed on the inner ring at the flange portion. A control pin 26 is formed so as to protrude at a position corresponding to the inner ring side control hole 9 so as to be inserted into the inner ring side control hole 9. The control pin 26 has a tapered tip and is fitted in a state where the positions of the inner ring side control hole 9 and the control plate side control hole 23 are deviated, and the deviation is forcibly corrected by the tapered surface. Thus, the axes of both control holes can be matched.

As shown in FIG. 1, the one-way clutch of the present embodiment composed of the above-described members has the control plate 2 fitted in the control plate fitting groove 6 of the inner race, and the roller control recess of the control plate 2. 22 and the long pin 14
Are fitted into the long pin fitting holes 24 of the control plate, and both sides thereof are loosely fitted into the long pin control holes 13 of the inner ring and protruded outward, and the control spring 11 having one end fixed to a side portion of the inner ring. The other end is engaged, and the control plate is urged to rotate clockwise in FIG. In this state, FIG.
As shown in (a), although the control plate side control hole 23 is slightly displaced clockwise from the inner ring side control hole 9, it partially overlaps and the control pin 26 can be inserted. Since the control spring 11 has a stronger spring force than the compression spring 16, the roller control surface 21 of the control plate 2 presses the roller 15 to the deepest portion against the compression spring 16 in this state. Therefore, the roller 15 is at a position where it does not contact the inner surface of the outer ring, and the outer ring and the inner ring can rotate relative to each other in both directions.

In the one-way clutch constructed as described above, for example, as shown in FIG. 2, the inner ring is fixed to the rotating shaft 28, and the slide bush body 25 can be moved along a spline groove provided on the rotating shaft 29. The outer ring 3 is assembled so that the control pin 26 and the inner ring side control hole of the inner ring have the same axis.
Is fixed to a fixed object (not shown) to operate as follows. In a state where the control pin is not inserted into the inner ring and the control plate, as shown in FIG. 2, since the roller is in a deep portion, the roller does not mesh with the outer ring 3, and the inner ring 1 and the outer ring 3 can freely move in both forward and reverse directions. In a state where it can rotate. Therefore, in this state, there is no function as a clutch,
It simply functions as a bearing. next,
When the slide bushing body 25 is slid toward the inner ring side by an appropriate driving device, the control pin 26 is inserted into the inner ring side control hole 9 of the inner ring, and the tip is tapered. Control plate side control hole 23 deviated from
The control plate side control hole 23
Is pressed to apply a rotational force to the control plate 2 in a direction in which the axis coincides with the inner ring-side control hole 9. At the same time, the roller control surface 21 of the roller control concave portion 22 that has pressed the roller moves in a direction to release the pressing of the roller, the roller is pressed by the compression spring 16 and moves on the cam surface, and the control pin is completely inserted. In this state, as shown in FIG. 3B, the roller 15 stops while being engaged with the inner peripheral surface of the outer race 3 and the cam surface. Therefore, when a rotational force is applied clockwise to the inner ring in this state, the roller 1
Reference numeral 5 increasingly bites into the gap between the inner peripheral surface of the outer ring and the cam surface to perform a wedge action, so that the inner ring 1 and the outer ring 3 are integrated, and the inner ring and the outer ring rotate integrally. If the outer wheel 3 is completely fixed, it acts as a brake and the rotation of the inner wheel stops. When the inner ring is rotated counterclockwise, the rollers 15 move in a direction to loosen the engagement, the inner ring and the outer ring are unified, and the inner ring 1 can rotate freely. That is, it functions as a one-way clutch.

As described above, the one-way clutch of the present embodiment functions only as a one-way clutch by moving the control pin 26 and as a mere bearing capable of rotating in both directions. The state can be switched arbitrarily. Next, an embodiment of a machine tool indexing device using a one-way clutch having the above basic configuration will be described with reference to FIGS. The present embodiment is applied to an indexing device of a hob cutter grinding device. FIG. 7 is a plan view and FIG. 8 is a front view. In the drawing, reference numeral 30 denotes a spindle, which clamps a work between a sharp tip 31 thereof and a spindle of a grinding device main body (not shown) and rotates the spindle intermittently at a predetermined index pitch. The spindle 30
One side is directly supported by a first bearing 34 provided on a first spindle flange 33 fixed to a base frame 32, and the other side is provided on a second spindle flange 35 provided on a base frame on the other end side. The pitch of the cutting teeth of the indexing master 40 is supported by a main shaft drive mechanism 37 including a main shaft drive motor and a transmission gear mechanism provided on the base frame 32 and supported by the second bearing 36 via a main shaft correction rotation mechanism 45 described later. It is adapted to be intermittently rotated in accordance with. The indexing master 40 is detachably fixed to the other end of the main shaft 30, and has cut teeth formed at a predetermined pitch for rotating the main shaft at a predetermined pitch. 41
Is a master stop plate having a stopper claw for engaging the notch and stopping the indexing master at a predetermined position. The master stop plate is fixed to the rolling plate 42, and a locking claw is always attached to the notching tooth of the indexing master. It is urged by a spring 43 in the engaging direction. Also,
A proximity switch is attached to the master stop plate to detect the notch reaching the position,
The spindle drive motor is controlled by the signal. The feed angle of the main shaft is based on the state where the cutting teeth are completely engaged with the stopper claws. The rolling plate 42 is rotatable with respect to the main shaft 30, but is connected and fixed to a main shaft correcting and rotating mechanism 45.

The spindle correction rotation mechanism 45 is used to correct an overrun of the spindle when the spindle is fed by one pitch, return the spindle to a reference point, and enable accurate high-precision feeding. The stop plate is indexed. The master and the rolling plate are equally rotated in the circumferential direction by the same angle and finely, and the phase angle of the work with respect to the indexing device body can be adjusted to easily perform wide cutting work on the work. In order to achieve this, a one-way clutch having a mechanism similar to that of the above-described embodiment is provided for the spindle correction rotation mechanism 45 provided.

In the one-way clutch 46 in the indexing device of the present embodiment, the inner race 47 is rotatably fitted to the main shaft 30, and the control plate 48 is fitted in the control plate fitting groove. On the other hand, the outer ring 49 is provided with a bearing 50 fitted to the main shaft 30.
Between the outer race and the inner race of the second bearing 36 provided on the second main spindle flange 35, and the main shaft 30 and the second
It is provided so as to be able to rotate relative to the spindle flange 35. The end of the outer ring 49 is fixed to a side surface of a phase adjustment gear 51 fixed to the rolling plate 42. Therefore, the outer ring 49, the phase adjustment gear 51, the rolling plate 42, and the master stop plate 41 are integrated.

The phase adjusting gear 51 is composed of a worm gear and, as shown in FIG. 9, is arranged orthogonally to a phase adjusting shaft 53 to which a phase adjusting knob 52 is fixed and a phase adjusting shaft 53 rotating via a gear mechanism. Phase adjustment worm shaft 5
4 and 55 are engaged with the worms 56 and 57 provided. Therefore, by manually rotating the phase adjusting knob 52, the phase adjusting gear 51 is rotated via the worms 56 and 57, and the position of the stopper claw is adjusted to a predetermined angle accordingly. A scale 58 (FIG. 8) for phase adjustment is provided on the outer peripheral surface of the phase adjustment knob.
In addition, the phase adjustment shaft is also transmitted by the phase adjustment motor 59, and the position of the stopper claw can be automatically changed by the motor, so that automatic phase adjustment can be performed.

A control pin 60 for controlling the engagement and disengagement of the one-way clutch 46 is provided on a slide bush assembly 61 as shown in FIGS. The slide bush assembly 61 is fixed to the main shaft 30 and has approximately 45
The spiral guide groove 62 having an angle of less than or equal to ° is fitted into the spiral guide 63, and the ball fitting recess formed in the inner peripheral surface of the slide bush 64 and the spiral guide groove 62 are fitted. By the moving ball,
The slide bush 64 moves left and right while being twisted along the spiral guide groove. The slide bush assembly 61 has an operating rod 65 protruding from an outer peripheral surface of the slide bush, and a tip end thereof is connected to a rotary solenoid 68. Incidentally, 66 in the figure
Is a spring guide ring, which is engaged with a spring 67 stretched over the base frame, and always urges the slide bush assembly toward the inner ring side of the one-way clutch by the spring. Has been maintained. In FIG. 7, reference numeral 70 denotes a gear change knob of the main shaft drive mechanism, and reference numeral 72 denotes a kelle turning plate.

The indexing device of this embodiment is configured as described above and operates as follows. The work is sandwiched between the sharp tip of the main shaft 30 and the main body of the grinder, and the work (hob cutter) is ground by a tool (not shown). When the grinding for one pitch is completed, the main shaft is rotated by the main shaft driving mechanism 37, When the detector detects the next cutting tooth of the indexing master 40 attached to the other end, the rotation of the motor is stopped by rotating the motor by a predetermined angle according to the pitch of the cutting teeth of the indexing master. Grind the feed position. At this time, assuming that the feed direction of the spindle is clockwise rotation, the spiral guide groove 6 of the spiral guide is provided.
Numeral 2 is twisted clockwise so that the right rotation is restricted when the one-way clutch is actuated, and the indexing notch of the indexing master engages with the stopper claw of the master stop plate during left rotation. It is configured to have a simple step surface.

While the workpiece is being worked, the stopper pawl of the master stop plate 41 is engaged with the notch of the indexing master, and the control pin of the one-way clutch is completely engaged with the inner ring and the control plate as shown in FIG. It is in the state fitted in the control hole. Therefore, in this state, the roller of the one-way clutch functions as a one-way clutch by being sandwiched between the outer ring 49 and the cam surface, and the inner ring and the control plate cannot rotate clockwise. When the machining of one tooth is completed, the rotary solenoid 6
8 operates to move the slide bush assembly 61 rightward in FIG. As a result, the control pin 60 comes out of the control hole of the control plate 48, and the control plate 48 is rotated rightward by the clutch control spring to move the rollers to the deep part of the cam groove, to lose the one-way clutch function, and to move in both directions. Enables rotation. At the same time, the spindle is rotated by one pitch by the spindle drive mechanism, and the stopper pawl of the master stop plate rides over one tooth and falls to the step of the next cutting tooth.

Next, when the operation of the rotary solenoid 68 is stopped, the slide bush assembly 61 is moved back to the original direction by the tension of the spring 67, and the control pin 60 is moved through the control hole of the inner disk portion of the inner ring 47. As soon as it penetrates, it is pushed into the control hole of the outer disk part from the control hole of the control plate 48. In the process, the control plate gradually rotates clockwise, and the axial center of the control hole of the inner ring and the control hole of the control plate are almost aligned, and the one-way clutch is engaged. Outer ring 49
Is fixed to the phase adjusting gear 51 and cannot rotate, so that the inner wheel cannot rotate rightward when the one-way clutch is engaged. On the other hand, the slide bush assembly 61
When moving to the left, the slide bush is restrained by the spiral guide groove and moves while twisting the slide bush to the right at an angle of approximately 45 ° or less.
When the control pin is fitted into the control hole of the inner race and the control plate, the inner race and the control plate are also rotated clockwise accordingly. However, when the slide bush assembly is still moved and the one-way clutch is engaged, the right rotation of the slide bush and the inner ring with respect to the outer ring 49 is prevented, but the slide bush assembly 61 is further moved by the spring 67. As a result, the rotational force generated by the twist angle of the spiral acts on the main shaft 30, and the main shaft 30 rotates counterclockwise according to the twist angle.

Therefore, the main shaft is returned and the cutting teeth of the indexing master 40 engage with the stopper pawls of the master stop plate, whereby the overrun of the main shaft is corrected, and the main shaft is positioned at an accurate position. High precision processing is possible. Further, when changing the processing phase for cutting or the like, by rotating the phase adjustment knob 52 or the phase adjustment motor 59 to a predetermined angle to adjust, the phase adjustment axis and the phase adjustment worm axis rotate,
The phase adjustment gear 51 rotates via a worm provided on the phase adjustment worm shaft, the master stop plate fixed thereto also rotates, and the stopper pawl shifts by a predetermined angle, whereby the phase is adjusted.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various embodiments can be adopted. For example, in the one-way clutch of the above-described embodiment, the cam surface is provided on the inner ring, but the cam surface is formed on the outer ring, and the control plate also has a roller control recess formed on the inner peripheral surface thereof, and has the same diameter as the inner peripheral surface of the outer ring. On the inner peripheral surface of the inner ring so as to be fitted to the outer peripheral portion of the inner ring. By changing the direction of the one-way clutch and combining two,
It is possible to reverse the direction of unidirectionality, to provide a clutch that can be controlled to a state where free rotation in both directions is not possible, or to change the directionality. Further, it goes without saying that the indexing device of the present invention is applicable not only to a grinding machine but also to indexing devices of various machine tools.

[0027]

According to the present invention having the above-described structure, the following special effects can be obtained. According to the one-way clutch of the present invention, it is possible to arbitrarily switch between a state in which the one-way clutch can smoothly rotate freely in both directions in a bearing state and a state in which the one-way clutch cannot freely rotate in one direction at any given time. . Therefore, the function can be achieved with only one member without employing a complicated mechanism including a large number of parts as in the related art, and an inexpensive mechanism can be obtained. By changing the direction of the one-way clutch and combining the two one-way clutches, the driven shaft and the driven shaft can freely rotate in both directions, and the driven shaft and the driven shaft can be integrally connected in both directions and integrally rotated or stopped. A state in which the clutch is also a one-way clutch in the direction can be adopted for selection. On the other hand, according to the indexing device for a machine tool of the present invention, it is possible to automatically correct the overrun during the feed rotation of the spindle mechanically to perform accurate indexing, and to efficiently perform the indexing even if the operator is not a skilled worker. Precise processing is possible. Further, the structure is simple and the operation is reliable.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a one-way clutch according to an embodiment of the present invention with an outer ring removed.

FIG. 2 is a perspective view of a one-way clutch according to the embodiment of the present invention.

3A and 3B are cross-sectional views of the operating state, in which FIG. 3A shows a state of functioning as a bearing, and FIG. 3B shows a state of functioning as a one-way clutch.

FIG. 4 is a perspective view of the inner race.

FIG. 5 is a perspective view of the control plate.

FIG. 6 is a front view of the slide bush.

FIG. 7 is a plan view of the indexing device of the machine tool according to the embodiment of the present invention with the cover removed.

FIG. 8 is a front view of the main part.

FIG. 9 is a sectional view taken along line AA in FIG. 7;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 inner ring 2 control plate 3 outer ring 8 cam surface 9 inner ring side control hole 11 control spring 14 long pin 15 roller 16 compression spring 22 roller control recess 23 control plate side control hole 25 slide bush body 26 control pin 30 main shaft 40 indexing master 41 master Stop plate 42 Rolling plate 45 Main shaft correction rotation mechanism 46 One-way clutch 47 Inner ring 48 Control plate 49 Outer ring 51 Phase adjustment gear 53 Phase adjustment shaft 60 Control pin 61 Slide bush assembly 63 Spiral guide 65 Operating rod 68 Rotary solenoid

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-17052 (JP, A) JP-A-61-59014 (JP, A) JP-A-4-52630 (JP, U) 35692 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 41/08 F16D 41/06 B23Q 16/02

Claims (2)

(57) [Claims] 1. An inner ring, an outer ring fitted to an outer peripheral portion of the inner ring, and an outer periphery of the inner ring on a spindle to which an indexing master is attached.
Cam inclined radially to either the surface or the inner peripheral surface of the outer ring
Surface is formed and meshes between the outer ring and the inner ring on the cam surface.
Moveable to meshable and non-meshable positions
A rolling element provided, the meshing position of the rolling element,
A control plate that controls movement to the position where meshing is impossible
The inner ring of the one-way clutch and the control plate are provided directly or indirectly, and the control pin is provided so as to move along the main axis while twisting with respect to the inner ring and the control plate. The indexing of the machine tool, wherein the rolling element further moves after moving to the meshable position and the one-way clutch is operated so that the main shaft can be minutely reversely rotated. apparatus. 2. A machine according to claim 1, wherein said machine tool is a grinding machine.
Indexing device.