JP3040526U - Indexing mechanism - Google Patents

Abstract

(57) [Summary] [Problem] To provide an indexing mechanism which can evenly, accurately and quickly index a rotary table and restrain it with a predetermined force, has a simple mechanism and requires a small installation space. SOLUTION: In the indexing mechanism, a rotary table 4 having a plurality of projections 11 provided on the same circumference centered on a rotation axis O, a pusher 12 engageable with and disengageable from the projections 11, and a rotary table 4 are provided. The fluid cylinder 13 that can reciprocate in the direction of pushing the protrusion 11 through the pusher 12 so as to roll and the direction of pulling the pusher 12 away from the protrusion 11, and the protrusion 11 pushed by the pusher 12 from the opposite side of the pusher 12. A braking member 14 is provided so as to be rotatable between a braking position P1 for receiving it and a release position P2 for releasing the braking of the protrusion 11 and allowing the protrusion 11 to move. When the protrusion 11 is pushed out to a predetermined position, the pusher 1
2 restrains the braking member 14 at the braking position P1, and when the pusher 12 separates from the protrusion 11, the braking member 14 can be moved to the releasing position P2.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an indexing mechanism such as a rotary table.

[0002]

[Prior art]

 As an indexing mechanism of this type, for example, in Japanese Patent Laid-Open No. 190236/1990, a rack and pinion mechanism using a fluid cylinder as a drive source rotates the table by a predetermined angle and another positioning fluid cylinder rotates the table. In the example in which it is prevented, and positioning grooves are formed on the rotary table at regular intervals in the circumferential direction, and on the outer peripheral side of these positioning grooves, another groove part whose one wall surface is an inclined surface is continuously provided. There is disclosed an example in which a roller having a cylinder as a drive source presses the inclined surface to rotate a rotary table, and further the roller is pushed into a positioning groove to constrain the rotary table in a predetermined position.

Further, in Japanese Patent Laid-Open No. 7-75941, actuating plates that are rotatable integrally with a rotary table are provided with operating projections at regular intervals in the circumferential direction, and a pusher that can be engaged with and disengaged from the operating projections is a fluid cylinder. To advance in a fixed direction to rotate the operating plate integrally with the table, and when the operating plate rotates a predetermined indexing angle, move the V-block-shaped braking plate from the opposite side of the pusher using another fluid cylinder. An example is disclosed in which an operating protrusion is sandwiched between a pusher and a brake plate, and thereby the rotary table is restrained in a predetermined position.

[0004]

[Problems to be solved by the device]

 The above-mentioned conventional techniques have the following drawbacks. First, in the example using the rack and pinion mechanism, the rotary table cannot be accurately positioned in the rack, so it is necessary to separately provide a positioning mechanism using keys, pins, or the like. Further, in order to continuously determine the angle, a component such as a notch is required, which increases the number of components and complicates the configuration.

Next, in the example of using the positioning groove and the roller, the mechanism is complicated and it is difficult to change the number of indexes. The rotary table may rattle due to the gap between the roller and the positioning groove.

Further, in an example in which a fluid cylinder for driving the braking plate is provided separately from the one for driving the pusher, when the indexing angle is changed, the braking plate is changed or the operation timing of the driving fluid cylinder is changed. There is a need.

In addition to the above publications, there is an example in which the rotary table is indexed by a fluid cylinder, but in any case, since the positioning clamp mechanism for the rotary table is separated from the drive mechanism of the table, Additional time is required for a series of operations such as rotation activation, indexing and clamping, which increases the components and their installation space. Furthermore, there are examples of indexing and positioning using a worm gear and a motor, but in that case a large space is required to install the motor, and the motor is also limited to those having a control function such as a pulse motor. A control device and a break device are also required.

[0008] Accordingly, an object of the present invention is to provide an indexing mechanism that can evenly, accurately and quickly index a rotary table and restrain it with a predetermined force, and that has a relatively simple mechanism and requires a small installation space. .

[0009]

[Means for Solving the Problems]

 Hereinafter, the present invention will be described with reference to the drawings showing the embodiments of the present invention. However, the present invention is not limited to the illustrated form.

According to the first aspect of the present invention, the rotation is provided rotatably around the rotation axis (O), and the plurality of protrusions (11) are provided on the same circumference centered on the rotation axis (O). A body (4), a pusher (12) which can be engaged with and disengaged from the protrusion (11), a direction in which the protrusion (11) is pushed out through the pusher (12) so that the rotating body (4) rotates in a predetermined direction, The fluid cylinder (13) capable of reciprocating in the direction of pulling the pusher (12) away from the protrusion (11) and the protrusion (11) pushed out by the pusher (12) are received from the opposite side of the pusher (12). A braking member (14) rotatably provided between the braking position (P1) and a release position (P2) for releasing the braking of the protrusion (11) and allowing the protrusion (11) to move. , And the protrusion (11) is pushed out to a predetermined position. When the pusher (12) pushes the braking member (14) at the braking position (P1), when the pusher (12) is driven away from the protrusion (11), the releasing position (P2) of the braking member (14). The above-mentioned problem is solved by an indexing mechanism characterized in that the relationship between the braking member (14) and the pusher (12) is set so as to enable the movement to (1).

According to a second aspect of the invention, in the indexing mechanism according to the first aspect, the braking member (14) is configured to receive the protrusion (11) at one end side with respect to the rotation fulcrum (30). The pusher (12) engages with the other end of the braking member (14) when the protrusion (11) is pushed out to a predetermined position, and restrains the braking member (14) at the braking position (P1). The restraint part (20b) which does is provided.

According to a third aspect of the invention, the indexing mechanism according to the second aspect is provided with means (35) for adjusting the timing at which the pusher (12) and the braking member (14) are engaged.

According to a fourth aspect of the present invention, in the indexing mechanism of the first aspect, when the pusher (12) is separated from the protrusion (11), means (33, 34, 34) for restricting rotation of the rotating body (4). 40).

According to a fifth aspect of the invention, in the indexing mechanism of the fourth aspect, the means for restricting rotation includes a biasing member (33) for biasing the braking member (14) toward the braking position (P1), The stopper (34) for restraining the braking member (14) urged by the urging member (33) to the braking position (P1) and the protrusion (11) at a position different from the braking member (14). And a reverse rotation limiting member (40) that comes into contact with the rotating body (4) from the opposite side with respect to the rotation direction of the rotating body (4).

According to the invention of claim 6, in the indexing mechanism of claim 5, a shock absorber (40) is provided as a reverse rotation limiting member. The movable part (42) of the shock absorber (40) is pushed by the protrusion (11) during the rotation of the rotating body (4), and when the indexing of the rotating body (4) is completed, the movable part (42) rotates together with the protrusion (11). It is provided so as to come into contact with the body (4) from the opposite side to the rotating direction.

According to the invention of claim 7, in the indexing mechanism of claim 1, guide means (23A, 23B, 23C) for guiding the pusher (12) is provided.

According to the invention of claim 8, the rotation is provided rotatably around the rotation axis (O), and a plurality of protrusions (11) are provided on the same circumference centered on the rotation axis (O). A pusher (12) movable along a moving path set so as to be substantially in contact with the body (4) and the rotation path of the protrusion (11) around the rotation axis (O), and the pusher (12). A fluid cylinder (13) that reciprocates along a moving path and a fluid cylinder (13) are rotatably provided on an extension of the pusher (12) in the pushing direction, and are rotated with respect to a rotation fulcrum (30). And a braking member (14) whose one end side with respect to the rotation fulcrum (30) is capable of projecting and retracting with respect to the rotation path of the protrusion (11), and the pusher (12) has the pusher (12). Is a fluid cylinder (13) with a braking member ( When the pusher (12) is pushed back to the side (14), it projects into the rotation path and engages with the projection (11), and when the pusher (12) is returned in the direction away from the braking member (14), the projection (11) pushes it away from the rotation path A feed claw (21) is provided, and when the projection (11) is sandwiched between one end side of the control member (14) and the feed claw (21) of the pusher (12), the braking member (14) is The object described above is achieved by an indexing mechanism in which the relationship between the braking member (14) and the pusher (12) is set so that the other end side of the rotation fulcrum (30) of (1) engages with the pusher (12). .

[0018]

[Embodiment of the invention]

 FIG. 1 is a plan view of an indexing table device having an indexing mechanism according to the present invention, and FIG. 2 is a partial vertical cross-sectional view of the device. This device 1 has a frame 2 which supports the main part of the device 1 and a rotary table 4 which is attached to the frame 2 via a rotary shaft 3. In the following, the left-right direction and the up-down direction of FIG. 1 are referred to as the left-right direction and the front-back direction of the device 1, and the direction orthogonal to the paper surface of FIG. 1 is referred to as the up-down direction of the device 1.

The male screw portion 3 a at the lower end of the rotating shaft 3 is inserted into the mounting hole 2 a of the frame 2 and screwed with the nut 5, so that the rotating shaft 3 is vertically fixed to the upper surface 2 b of the frame 2. ing. A small diameter portion 3b is provided at the upper end of the rotating shaft 3. A bearing 6 is attached to the outer circumference of the small diameter portion 3b, and the rotary table 4 is fitted to the outer circumference thereof. As a result, the rotary table 4 is rotatably supported around the axis O (see FIG. 2) of the rotary shaft 3. Various workpieces are placed on the upper surface 4a of the turntable 4.

The rotary table 4 is indexed and driven by the indexing mechanism 10 in a predetermined rotation direction X (clockwise direction in FIG. 1) by a predetermined angle. The indexing mechanism 10 is mounted on a rotary table 4 as a rotary body and projects from a lower surface 4b of the rotary table 4. A plurality of operating projections 11, 11 ..., A pusher 12 for pushing the operating projection 11 in one direction, and a pusher 12 are provided. It has an air cylinder 13 attached to the frame 2 for driving the vehicle, and a braking plate 14 for receiving the actuating projection 11 from the opposite side of the pusher 12.

The operation protrusion 11 is formed in a pin shape having a constant diameter, and the upper end thereof is fitted into the mounting hole 4 c of the rotary table 4. The number of operating projections 11 is set according to the indexing angle of the rotary table 4. In the configuration shown in the figure, the rotary table 4 is indexed at six positions at equal pitches per one rotation, that is, at intervals of 60 °, so that six operating protrusions 11 are provided at equal pitches on the same circumference centered on the axis O.

The pusher 12 has a feed claw base 20 formed in a substantially rectangular parallelepiped block shape, and a feed claw 21 attached to the feed claw base 20. Four rollers 22, 22, ... Are attached to the lower portion of the feed claw base 20, and the pusher 12 is supported by the rollers 22 on the upper surface 2b of the frame 2 so as to be movable in the left-right direction. The piston rod 13a of the air cylinder 13 is connected to the right end portion of the feed claw base 20, whereby the pusher 12 is reciprocally driven on the frame 2 in the left-right direction as the piston rod 13a of the air cylinder 13 advances and retracts. . The operation of the air cylinder 13 is switched and controlled by a known pneumatic control circuit using an electromagnetic valve or the like.

A pair of guide blocks 23 A and 23 B are provided on the upper surface 2 b of the frame 2 so as to sandwich the feed claw base 20 in the front-rear direction of the apparatus 1. The longitudinal direction of the guide blocks 23A and 23B coincides with the lateral direction of the device 1. A pair of rollers 24A, 24A capable of rolling along one guide block 23A are provided on the upper surface side of the feed claw base 20, and a pair of rollers 24B capable of rolling along the other guide block 23B are provided on the lower surface side. , 24B are mounted respectively. As a result, the pusher 12 is accurately guided in the movement direction of the air cylinder 13 (axial direction of the piston rod 13a) without causing meandering. Further, rattling of the pusher 12 when the rotary table 4 is restrained is suppressed, and the stability of the restrained state is enhanced. A guide block 24C is attached to the upper end of one guide block 24A so as to cover the feed claw base 20 from above. If necessary, rollers capable of rolling along the guide block 24C may be sent to the claw base 20.

A notch 20 a is formed in the upper part of the feed claw base 20, and the above-mentioned feed claw 21 is rotatably attached to the notch 20 a via a pin 25 in the vertical direction. A compression spring 26 in the form of a coil spring is interposed between the feed claw base 20 and the feed claw 21 in a somewhat compressed state. The restoring force of the compression spring 26 urges the feed pawl 21 to rotate around the pin 25 in the clockwise direction in FIG. As a result, the feed claw 21 is supported by the feed claw base 20 in a state in which the engaging portion 21a at its tip is projected from the notch 20a to the side of the feed claw base 20. The engaging portion 21 a protruding from the notch 20 a can be engaged with and disengaged from the operating protrusion 11 of the rotary table 4 according to the reciprocating movement of the pusher 12 by the air cylinder 13.

The braking plate 14 is fitted around a pin 30 provided on the frame 2 and is rotatably provided around the pin 30. On one side of the braking plate 14 with respect to the pin 30, there is formed a notch 14a having an arc-shaped cross section for receiving the actuating projection 11 from the opposite side of the pusher 12. A spring hook 31 is provided on the other end side of the braking plate 14 with respect to the pin 30, and a coil spring-shaped tension spring 33 is stretched to some extent between the spring hook 31 and the spring hook pin 32 provided on the frame 2. It is being passed over in a closed state. Due to the restoring force of the tension spring 33, the braking plate 14 is biased around the pin 30 in the clockwise direction in FIG. 1 and abuts against the stopper pin 34 provided on the frame 2.

An adjusting bolt 35 is screwed into the other end of the braking plate 14. The tip of the adjusting bolt 35 projects from the braking plate 14 to the pusher 12 side, and can come into contact with the end surface (restriction portion) 20b of the feed claw base 20 sent to the braking plate 14 side by the air cylinder 13.

A shock absorber 40 is arranged on the rear side (upper side in FIG. 1) of the frame 2. The shock absorber 40 has a main body portion 41 fixed to the frame 2 and a movable portion 42 which is provided so as to be capable of expanding and contracting in the front-rear direction of the device 1 with respect to the main body portion 41. The movable portion 42 is urged toward the braking plate 14 (in front of the frame 2) by a coil spring (not shown) built in the main body portion 41, and the tip of the movable portion 42 enters the rotation path of the operation protrusion 11. Therefore, when the rotary table 4 is rotationally driven around the rotary shaft 3, the actuating projection 11 abuts on the movable portion 42 and the movable portion 42 is pushed in, as shown by an imaginary line L1 in FIG.

Next, the operation of the index table device 1 will be described. FIG. 1 shows a state in which the rotary table 4 is restrained by the indexing mechanism 10. In this state, the piston rod 13a of the air cylinder 13 is extended and one actuating projection 11 is pressed against the braking plate 14 by the feed pawl 21 of the pusher 12. At this time, since the adjusting bolt 35 of the braking plate 14 and the end surface 20b of the feed claw base 20 contact each other, rotation of the braking plate 14 in the counterclockwise direction around the pin 30 is prevented, and as a result, the braking plate 14 Is held at a braking position P1 for receiving the actuating projection 11. As a result, the actuating projection 11 is sandwiched between the braking plate 14 and the feed claw 21, and rotation of the turntable 4 is blocked. In this state, the work piece placed on the rotary table 4 is machined.

When the machining is completed, the electromagnetic valve of the pneumatic control circuit (not shown) is switched, and the air cylinder 13 operates in a direction to store the piston rod 13a. As a result, the pusher 12 retracts toward the air cylinder 13 side as shown by the arrow R in FIG. During this backward movement, the engaging portion 21a of the feed claw 21 comes into contact with the rear actuating projection 11, and the compression spring 26 contracts accordingly and the engaging portion 21a is stored in the notch 20a. When the pusher 12 is further retracted, the feed claw 21 is retracted by bypassing the rear operation protrusion 11 as shown in FIG. 3B, and the engaging portion 21a is projected from the notch 20a by the compression spring 26. Will be returned.

When the pusher 12 is retracted, the control plate 14 is held at the braking position P1 by the tension spring 33 and the stopper pin 34, so that the operating projection 11 is restrained by the braking plate 14 and the rotary table 4 rotates normally. (Direction of arrow X in FIG. 1) is blocked. On the other hand, the reverse rotation of the rotary table 4 (the direction opposite to the arrow X direction in FIG. 1) is blocked by the actuation projection 11 engaging with the side surface of the movable portion 42 of the shock absorber 40 (see FIG. 1). .

When the piston rod 13a of the air cylinder 13 retreats to its rearmost position (the position in which it is maximally stored in the cylinder), the electromagnetic valve of the pneumatic control circuit for the air cylinder 13 is switched, and FIG. As indicated by arrow F, the air cylinder 13 operates in a direction to push out the piston rod 13a. It is desirable to provide a speed adjusting valve in the pneumatic control circuit for the air cylinder 13 and move the air cylinder 13 forward at a constant speed.

When the piston rod 13a of the air cylinder 13 is pushed out, the pusher 12 moves to the side of the braking plate 14 accordingly, and the engaging portion 21a of the feed pawl 21 engages with the operating protrusion 11 and further The protrusion 11 is pushed out toward the braking plate 14, and the rotary table 4 starts to rotate normally. At this time, the braking plate 14 is pushed by another actuating protrusion 11 to rotate in the counterclockwise direction (arrow Y direction) around the pin 30, and the actuating protrusion 11 pushes out the restraining plate 14 and moves on the rotary table 4. Move in the forward direction X. The position P2 of the control plate 14 at this time is the release position. When the operating projection 11 gets over the brake plate 14, the brake plate 14 is rotated clockwise by the force of the tension spring 33 to return to the braking position P1 as shown by an arrow Z in FIG. 3 (d). During the forward rotation of the rotary table 4, another actuating projection 11 contacts the movable portion 42 of the shock absorber 40, and the movable portion 42 is pushed in to move in the normal rotation direction of the rotary table 4. As a result, the vibration of the turntable 4 during the rotation is absorbed.

By further pushing the pusher 12 toward the braking plate 14 from the state of FIG. 3D, the operating projection 11 is sandwiched between the feeding pawl 21 and the braking plate 14, and at that time, the feeding pawl base 20 The end surface 20b of the above contacts the tip of the adjusting screw 35, and the rotation of the braking plate 14 to the release position P2 is blocked (the state of FIG. 1). As a result, the rotary table 4 rotates by 60 ° and is restrained at that position. Thereafter, similarly, the rotary table 4 is indexed and driven by 60 °.

According to the above configuration, when the rotary table 4 is positioned and constrained, the braking plate 14 is simultaneously pushed by the pusher 12 in the opposite directions about the pin 30 which is the fulcrum of rotation thereof. As long as the actuating projections 11 are arranged around the rotary shaft 3 at exactly the same pitch, the rotary table 4 is accurately indexed by a predetermined angle and is securely restrained at the indexed position. Since the rotation, positioning, and restraint of the rotary table 4 are completed by simply driving the pusher 12 back and forth with the air cylinder 13, a mechanism dedicated to positioning and restraint, such as a wedge mechanism, is provided separately from the drive mechanism of the rotary table 4. There is no need to install a pin mechanism or a pin mechanism, the number of parts of the indexing mechanism and the installation space are reduced, and the operating time is also shortened. The number of indexes can be changed by simply replacing the rotary table 4 with a different number of protrusions 11.

In the above embodiment, the shock absorber 40 blocks the reverse rotation of the rotary table 4 when the pusher 12 retracts to the air cylinder 13 side, but the reverse rotation may be blocked by another means. For example, resistance may be added to the rotary support portion of the rotary table 4 with respect to the rotary shaft 3 to increase the load required to rotate the rotary table 4. The restraining position of the rotary table 4 can be finely adjusted by changing the screwing amount of the adjusting screw 35 with respect to the control plate 14, but if not necessary, the adjusting screw 35 may be omitted. The guide blocks 24A, 24B and 24C may be removed if unnecessary. At least three actuating protrusions 11 are required, and therefore, the rotary table 4 can be indexed into three equal parts or more in the circumferential direction. It is also possible to provide another rotating body that rotates in conjunction with the rotary table 4 and provide the operating protrusion 11 on the rotating body. The notch 14a of the braking plate 14 may have a V-shaped cross section or may be omitted. A notch may be provided in the engaging portion 21a of the feed pawl 21. Instead of the air cylinder 13, various fluid sheep cylinders such as a hydraulic cylinder may be used.

[0036]

[Effect of the invention]

 As described above, according to the inventions of claims 1 and 8, when the pusher is pushed out by the fluid cylinder, the protrusion is pushed out through the pusher to rotate the rotating body in a predetermined direction, and the rotation thereof is performed. When the angle reaches the predetermined amount, the protrusion is sandwiched between the braking member and the pusher, and the braking member is constrained to the braking position by the pusher and the rotating body is constrained to the predetermined position. In this way, since a common fluid cylinder can perform a series of operations such as rotational driving, positioning, and restraint of the rotating body, the number of parts can be reduced compared to the conventional example in which rotational driving and positioning are performed using separate cylinders. Reduced, the mechanism is simplified and the installation space is reduced.

The number of indexes can be changed simply by replacing the rotating body with one having a different number of protrusions. When the rotating body is stopped, the protrusions are reliably sandwiched between the braking member and the pusher, so there is no possibility of rattling of the rotating body. . The repetitive positioning accuracy of the rotating body is also kept high.

Since a plurality of fluid cylinders are not required, it is not necessary to adjust the operation timing between the cylinders, and the time required for the indexing process is shortened. In particular, since the rotating body is restrained at the same time as the positioning, the indexing process can be quickly completed.

An actuator having a fine resolution like a pulse motor is not required, and a complicated control circuit is not required.

According to the second aspect of the present invention, the pusher pushed out by the fluid cylinder simultaneously pushes the damping members to the opposite sides with respect to the rotation fulcrum, and securely restrains the damping member to the braking position. Therefore, it is possible to provide an indexing mechanism with high repeatability positioning accuracy for the rotating body.

According to the invention of claim 3, the stop position of the rotating body can be finely adjusted by adjusting the timing at which the pusher and the braking member are engaged with each other.

According to the invention of claim 4, when the pusher is pulled away from the protrusion to rotate the rotating body, the normal rotation and the reverse rotation of the rotating body are reliably prevented. Therefore, there is no possibility that the rotating body will loosen before the pusher engages with the next projection, resulting in malfunction, and the reliability of the indexing mechanism can be improved.

According to the invention of claim 5, the rotating member can be restrained in the rotational driving direction (forward rotation direction) by the pusher by the braking member, and can be restrained in the opposite direction (reverse rotating direction) by the reverse rotation preventing member. it can. Then, when the rotating body is driven by the pusher, the projection that receives the driving force causes the braking member to retreat to the release position against the biasing means, and after the projection gets over the braking member, the force of the biasing member is applied. The braking member can be reliably returned to the braking position.

According to the invention of claim 6, in the middle of the rotation of the rotating body, the protrusion pushes the movable portion, whereby the vibration of the rotating body is alleviated, and the rotating body rotates smoothly. Then, when the protrusion gets over the movable part, the movable part that has returned to the position before being pushed in engages with the protrusion from the side opposite to the rotational drive direction of the rotating body, thereby preventing the rotating body from being reversed.

According to the invention of claim 7, it is possible to prevent the pusher from meandering and rising, improve the indexing accuracy of the rotating body, and stabilize the restrained state of the rotating body.

[Brief description of the drawings]

FIG. 1 is a plan view of an indexing table device having an indexing mechanism according to the present invention.

2 is a partial vertical cross-sectional view of the device of FIG.

FIG. 3 is a diagram showing an operating state of the apparatus of FIG.

[Explanation of symbols]

 1 Indexing Table Device 4 Rotary Table 10 Indexing Mechanism 11 Actuating Protrusion 12 Pusher 13 Air Cylinder 14 Braking Plate 20 Feeding Claw Platform 21 Feeding Claws 23A, 23B, 23C Guide Block 33 Tension Spring 34 Stopper Pin 35 Adjusting Screw 40 Shock Absorber 42 Shock Absorber 42 Movable part P1 Braking plate braking position P2 Brake plate releasing position

Claims (8)

[Utility model registration claims] 1. A rotatably provided about an axis of rotation,
A rotating body provided with a plurality of protrusions on the same circumference around the rotation axis, a pusher engageable with and disengageable from the protrusions, and a pusher for rotating the rotating body in a predetermined direction. A fluid cylinder capable of reciprocating in a direction of pushing out the protrusion and a direction of pulling the pusher away from the protrusion, a braking position for receiving the protrusion pushed out by the pusher from the opposite side of the pusher, and a braking of the protrusion. And a braking member rotatably provided between a release position allowing the movement of the projection and allowing the movement of the projection, and when the projection is pushed to a predetermined position, the braking member is moved by the pusher. The braking member is constrained to a braking position, and when the pusher is driven in a direction away from the protrusion, the braking member is allowed to move to the release position. The indexing mechanism is characterized in that the relationship between the pusher and the pusher is set. 2. The braking member is configured to receive the protrusion at one end side with respect to a rotation fulcrum thereof, and the pusher has a second end side of the braking member when the protrusion is pushed to a predetermined position. The indexing mechanism according to claim 1, further comprising a restraint portion which is engaged with the restraint member and restrains the brake member at the braking position. 3. The indexing mechanism according to claim 2, further comprising means for adjusting a timing at which the pusher and the braking member are engaged with each other. 4. The indexing mechanism according to claim 1, further comprising means for limiting rotation of the rotating body when the pusher is separated from the protrusion. 5. The biasing member for biasing the braking member toward the braking position, and the braking member biased by the biasing member constrained to the braking position, the means for restricting the rotation. 5. A stopper for stopping rotation, and a reverse rotation restricting member that is in contact with the one of the protrusions from a side opposite to the rotation direction of the rotating body at a position different from the braking member. The described indexing mechanism. 6. A shock absorber is provided as the reverse rotation limiting member, and the movable portion of the shock absorber is
Pushed by the protrusion during the rotation of the rotating body,
The indexing mechanism according to claim 5, wherein when the indexing of the rotating body is completed, the protrusion and the rotating body are provided so as to come into contact with each other from opposite sides with respect to a rotation direction of the rotating body. 7. The indexing mechanism according to claim 1, further comprising guide means for guiding the pusher. 8. A rotatably provided about an axis of rotation,
A rotating body provided with a plurality of protrusions on the same circumference centered on the rotation axis, and a movement body set along a movement path set so as to be substantially in contact with a rotation path of the protrusions centered on the rotation axis. A pusher capable of moving, a fluid cylinder that reciprocates the pusher along the movement path, and a rotatably provided extension of the pusher by the fluid cylinder in the pushing direction. A braking member whose one end side with respect to the rotation fulcrum is capable of projecting and retracting with respect to the rotation path of the protrusion, when the pusher is pushed toward the braking member side by the fluid cylinder. To project into the rotation path, engage with the projection, and push back from the rotation path by the projection when the pusher is returned in the direction away from the braking member. When the protrusion is sandwiched between the one end side of the braking member and the feed claw of the pusher, the other end side of the braking member with respect to the rotation fulcrum is the pusher. An indexing mechanism, wherein a relationship between the braking member and the pusher is set so as to engage with each other.