JPH07185919A - Index chuck - Google Patents

Abstract

PURPOSE:To make a chuck compact by simplifying an inner device of an index chuck. CONSTITUTION:An index input/output shaft 43 to be engaged with an externally mounted index drive shaft 15 is provided on a chuck body 31 in an axially movable and turnable manner, the index input/output shaft 43 is connected to a second clamp claw 41 so as to realize the index turning by the rotation of the index input/output shaft 43, and a clutch 46A which is attached/detached to/from the index input/output shaft 43 through the radial movement is provided between the index input/output shaft 43 and the chuck body 31. A crank plunger is provided so as to be radially moved by the movement of an unclamp input shaft 35 which is attached/detached to/from an externally mounted unclamp drive shaft 14 through a swaying lever 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an index chuck for indexing a work into a plurality of indexing positions for machining.

[0002]

2. Description of the Related Art Conventionally, index chucks of this type have been disclosed in, for example, Japanese Utility Model Laid-Open No. 61-187609, a chuck body, and a clamp plunger which is slidable in the radial direction thereof. The first clamp claw is rotatably supported around the indexing axis, and the clamp plunger is moved in the radial direction via the swing arm by the double-acting cylinder with a built-in chuck body. The workpiece is clamped and unclamped between the second clamp claw which is opposed to the clamp claw and is rotatably supported by the chuck body, and in the work clamped state, an indexing angular piece that is integral with the second clamp claw. Are alternately pressed by the piston plungers of the two indexing cylinders with built-in chuck body, the second clamp claw is rotated, and the workpiece is indexed to the predetermined indexing position. Those that are known.

[0003]

In the above-mentioned conventional index chuck, in order to index the second clamp claw,
Since the two indexing cylinders are built in the chuck body, there is the first problem that the entire chuck becomes large. In addition, the index chuck has a second problem in that it cannot be indexed in two positions because it is indexed by engaging and disengaging the square top and the two piston plungers. Further, in the chuck, since the double-acting cylinder is built in the chuck body in order to unclamp the first clamp claw,
There was a third problem that the entire chuck became larger. In addition, the chuck requires a rotating cylinder at the rear end of the lathe spindle to which the chuck is attached in order to supply pressurized fluid to each built-in cylinder, and a long pipe must be connected from this rotating cylinder to the chuck. Was complicated.

In view of these conventional techniques, the first aspect of the present invention
The problem of (1) is to obtain a compact index chuck that does not have an indexing drive source for indexing and rotating the second clamp claw in the chuck. A second object of the present invention is to obtain an index chuck capable of finely indexing a clamp claw.
A third object of the present invention is to obtain a more compact index chuck which does not have an unclamping drive source for a clamp plunger inside the chuck. A fourth object of the present invention is to obtain an index chuck in which all the operations of the index chuck do not depend on fluid pressure and a rotary cylinder on the spindle side for mounting the chuck can be omitted.

[0005]

In order to solve the first problem, in the invention of claim 1, the chuck body is provided with an engaging portion for engaging with an externally provided indexing drive shaft. A shaft is provided, and the indexing input shaft and the second clamp claw are connected so as to rotate by indexing by the operation of the indexing input shaft. As a preferred embodiment thereof, in the chuck according to claim 2, The main body is provided with a clamp spring for urging the clamp plunger in the clamp direction, and the index input shaft integrally provided with the second clamp pawl at the radially inner end is rotatable about the index axis and has a radius. It is supported so that it can move in any direction, and this indexing input shaft is urged outward in the radial direction, and a clutch that disengages by the radial movement of the indexing input shaft is interposed between the indexing input shaft and the chuck body. Is characterized by.

In order to solve the second problem, claim 3
In the invention, the chuck body is provided with a clamp spring for urging the clamp plunger in the clamp direction, and the index input shaft integrally provided with the second clamp claw at the radially inner end is rotated around the index axis. The index input shaft is movably supported and is movable in the radial direction. The index input shaft is biased outward in the radial direction, and the index input shaft and the chuck body are disengaged from each other by the radial movement of the index input shaft. A clutch is interposed, and this clutch is provided between the back surface of the second clamp claw and the chuck body portion facing the second clamp claw, and is provided with a large number of meshing teeth at a predetermined pitch in the circumferential direction. Characterize.

Further, in order to solve the third problem, claim 4
In the invention, the unclamp input shaft having an engagement / disengagement portion that engages / disengages with the external unclamp drive shaft is movably provided on the chuck body, and the unclamp input shaft and the clamp plunger are attached to the unclamp input shaft. The clamp plungers are connected so as to move in the radial direction by the operation of.

In order to solve the fourth problem, claim 7
In addition to the structure of claim 2, the chuck body is provided with an unclamp input shaft having an engagement / disengagement portion that engages / disengages with an external unclamp drive shaft so as to be movable in the axial direction. The clamp plunger is connected so that the clamp plunger moves in the radial direction when the unclamp input shaft operates, and the chuck body locks the clamp body by engaging and disengaging with the unclamp input shaft. Is provided with a switching shaft that switches between a locked position and an unlocked position by operating an external indexing drive shaft.

[0009]

According to the invention of claim 1, an indexing drive shaft provided outside (for example, a milling shaft rotatably supported by a turret tool rest of a composite lathe and rotated by a motor).
Is engaged with the indexing input shaft, and the indexing drive shaft is rotated to perform indexing rotation of the second clamp claw. Therefore, the indexing drive source is not required in the chuck body, and the size of the chuck as a whole is reduced.

According to the third aspect of the present invention, the indexing input shaft is moved in the axial direction by the axial movement of the indexing drive shaft to disengage the clutch so that the second clamp pawl is rotatable with respect to the chuck body. In that state, the rotation of the indexing input shaft causes the second clamp claw to be indexed and rotated. The clutch has a large number of meshing teeth, and fine indexing can be performed at the pitch of the meshing teeth.

According to the fourth aspect of the invention, the unclamp input shaft provided separately from the indexing input shaft is engaged with the external unclamp drive shaft (the above-mentioned milling shaft or the like) to operate the unclamp input shaft. The clamp plunger is moved in the radial direction to release the clamped state by the first clamp claw.

According to the seventh aspect of the invention, all of the clamping and unclamping operations of the first clamp claw and the indexing and positioning operation of the second clamp claw are performed by the indexing drive shaft and the unclamping drive shaft outside the chuck body. The lock member that locks the clamped state of the first clamp claw is also operated by the operation of the indexing drive shaft via the switching shaft, and all the operations required for the index chuck are performed without using fluid. It is possible to omit the rotary cylinder which is provided at the rear end of the main spindle of the lathe.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a plane of a composite lathe 2 equipped with an index chuck 1 of the present invention. The composite lathe 2 is provided on one side of the bed 3, and has a headstock 5 that rotatably supports a spindle 4 having an index chuck 1 attached to the tip thereof, and an axial direction of a rotation center line S on the front side of the spindle 4. And rotation center line S
And a turret tool post 9 adapted to move and rotate in a direction orthogonal to. As shown in FIG. 2, the turret tool post 9 has a turret shaft 6 rotatably supported about an axis parallel to the rotation center line S. The turret head 7 provided on the index chuck 1 side of the turret shaft 6 has a bite 8
In addition, the unclamp drive shafts 14 (shown in FIG. 1) are radially fixed to the bite holder 12 to which the drill 16 for fixing the holes is fixed to the drill holder 11, respectively, and usually the milling shaft 13 for performing the milling process. Is rotatably supported, and an indexing drive shaft 15 is attached to the milling shaft 13.

The indexing rotation is transmitted to the turret shaft 6 through a gear 6a by a tool indexing device (not shown), and a desired cutting tool 8, at a horizontal indexing position having the same height as the rotation center line S,
Drill 16 or unclamp drive shaft 14, index drive shaft 1
5 can be indexed toward the index chuck 1. As shown in FIG. 3, the unclamp drive shaft 14 is
A fitting hole 14a is provided at the tip of the shaft so that it can be engaged with an unclamp input shaft 35 described later. Also, indexing drive shaft 1
5, a large number of clutch teeth 1 are circumferentially provided at the tip of the shaft so that they can be engaged with clutch teeth 44a of the indexing input shaft 43 described later.
5a is provided.

The turret shaft 6 is hollow, and the drive shaft 17 of the milling shaft 13 is rotatably supported at its center via a bearing 18. The bevel gear 19 at the tip of the drive shaft 17 meshes with the bevel gear 20 of the milling shaft 13, and the pulley 21 provided at the rear of the drive shaft 17 causes the rotational driving force of the drive motor 22 to reach the motor pulley 23 and the belt 24. The milling shaft 13 is rotated by the rotation of the milling shaft 13. The drive motor 22 is, for example, a servo motor, and in addition to continuous rotation, the indexing drive shaft 15 attached to the milling shaft 13 is rotated by an arbitrary amount (an integer multiple of a pitch of meshing teeth of a clutch described later).
The rotation amount can be controlled by the rotation control means 25 so that it can be rotated only.

Next, the index chuck will be described. As shown in FIGS. 3 and 4, at the front part of the chuck body 31 of the index chuck 1, a clamp plunger 32 is provided on the indexing axis A orthogonal to the rotation center line S.
1 is slidably supported in the radial direction. The clamp plunger 32 supports a first clamp claw 33 at its inner end via a thrust bearing 34 so as to be rotatable about the index axis A. An outer peripheral portion of the chuck body 31 outside the clamp plunger 32 is closed by a closing member 31a. An unclamp input shaft 35 is supported adjacent to the clamp plunger 32 so as to be movable in the axial direction of an axis C parallel to the index axis A. The unclamp input shaft 35 and the clamp plunger 32 are connected by a swing lever 36 supported by the chuck body 31 as follows.

The swing lever 36 has an intermediate spherical portion swingably supported by the chuck body 1, and spherical portions at both ends thereof are engaged with the engaging portion 32a of the clamp plunger 32 and the engaging portion 35a of the clamp input shaft 35, respectively. Unclamped input shaft 3
By the axial movement of 5, the clamp plunger 32 is moved inward and outward in the radial direction. In the unclamp input shaft 35, the unclamp input shaft 35 is axially pressed into a recessed hole 35b formed in the end portion on the side opposite to the clamp plunger 32, and the clamp plunger 32 is moved through the swing lever 36. A clamp spring 37 for urging in the clamping direction B (the direction of the arrow in FIG. 3) is mounted between the chuck body 31 and the integral plate 31b. The end of the unclamp input shaft 35 in the direction of the clamp plunger is exposed to the outside, and the exposed end is free to engage with and disengage from the hole bottom surface 14b of the fitting hole 14a of the unclamp drive shaft 14 described above. An engaging / disengaging portion 35c having an outer diameter slightly smaller than the hole diameter of the fitting hole 14a is provided in the.

Further, an inclined surface 35d is provided in the middle of the outer peripheral surface of the unclamp input shaft 35 in the main axis direction.
By disengaging the inclined surface 38a of the lock member 38, which is arranged at the rear end of the chuck body 31 on the inclined surface 35d and is driven by a rotary cylinder (not shown) at the rear end of the main shaft 4 and reciprocates on the rotation center line S. , Locking member 38
Is engaged with the inclined surface 35d, the clamp plunger 32 clamps the work by the urging of the clamp spring 37.
Of the inclined surface 3 by locking the clamp member 38
When the work W is released from 5d, the work W is clamped by the spring force of the clamp spring 37. When the engagement / disengagement portion 35c of the unclamp input shaft 35 is pushed in that state, the clamp plunger 32 is in the unclamped state. It is like this.
In this embodiment, the clamp of the clamp plunger (first clamp claw 33) 32 is locked by such a lock member 38. However, depending on processing conditions, the spring force of the clamp spring 37 and the unclamp input may be different. The work can be clamped by the centrifugal force used for the shaft 35. In this case, the above-mentioned lock member 38 can be omitted.

Next, the second clamp claw 41 is radially inner end of the indexing input shaft 43 supported by the chuck body 31 so as to be slidable in the radial direction and rotatable about the indexing axis A. And is opposed to the first clamp claw 33 in the radial direction. A positioning member 42 for the work W is provided on the surface of the second clamp claw 41 facing the first clamp claw 33, and when the work W is inserted, the positioning groove Wa provided on the work W is fitted. The work W is gripped by the first clamp claws 33, and the first machining surface is positioned so as to face the corresponding tool. A clutch member 44 is attached to the index input shaft 43 at an outer end in the radial direction by a bolt 45, and an outwardly exposed end of the clutch member 44 is engageable with a clutch tooth 15a of the index shaft 15. A large number of clutch teeth 44a are engraved as parts. The clutch member 44 is arranged between the spring bearing 49 and the thrust bearing 50 and between the chuck body 31 and the spring 4.
8, the index input shaft 43 is urged radially outward.

The clutch member 46 on the rear surface of the second clamp claw 41 of the index input shaft 43 and the chuck body 31 facing the clutch member 46.
The clutch 46A configured with the clutch member 47 of
The rotation indexing position of the indexing input shaft 43 is maintained in the engaged state by the spring 48, and the engagement between the indexing input shaft 43 and the indexing drive shaft 15 is disengaged by the inward movement in the radial direction. In the state, the indexing input shaft 43 can be indexed. The clutch members 46, 47 are provided with a plurality of meshing teeth 46a, 47a on the surfaces facing each other in the circumferential direction at a predetermined pitch (for example, every 1 degree), such as a carbic coupling. Teeth 46a, 47a
Since there are many, it is possible to have many indexing positions.

Next, the operation of the index chuck 1 will be described. The spindle 4 is rotationally controlled, the unclamp input shaft 35 of the chuck body 31 is horizontal, and the engagement / disengagement 35C of the spindle 4 is directed toward the turret tool post. On the other hand, by moving the turret tool post 9 and indexing the turret shaft 6,
The unclamp drive shaft 14 of the turret shaft 6 and the unclamp input shaft 35 are opposed to each other on the same axis C. Next, FIG.
As shown in (3), the lock member 38 on the chuck body 31 side is retracted to release the engagement with the unclamp input shaft 35 and allow the unclamp input shaft 35 to freely move in the unclamp direction. The unclamp drive shaft 14 moves into the chuck body 31 by the movement of the turret tool post 9 (arrow E in FIG. 5),
It engages with the unclamp input shaft 35 and moves it in the axial direction by a predetermined amount. The unclamp input shaft 35 oscillates the oscillating lever 36 against the spring force of the clamp spring 37, moves the connected clamp plunger 32 in the unclamp direction D (shown in FIG. 5), and moves the first clamp at the tip end. The gap between the clamp claw 33 and the second clamp claw 41 is increased so that W can be inserted. Then, the positioning groove Wa of the work W is fitted into the positioning member 42 of the second clamp claw 41, and the unclamp drive shaft 14 is retracted to the outside of the chuck body.

Then, the unclamp input shaft 35 returns to its original position by the spring force of the clamp spring 37, the first clamp claw 33 moves in the clamp direction, and the workpiece W is gripped between the second clamp claw 41. The processing location of the work W is located on the rotation center line S. Next, the lock member 38 is advanced from the retracted position to lock the unclamp input shaft 35. In this state, the drill 16 is indexed on the rotation center line S and the chuck body 31 is rotated to move the drill 16 in the direction of the arrow to machine one surface W1 of the work W (shown in FIG. 6).

When the drill 16 which has finished machining one surface W1 moves away from the work W, the chuck body 31 makes the indexing input shaft 43 horizontal, and the clutch teeth 44a of this indexing input shaft 43 are attached to the turret blade. The rotation is stopped in the direction of the table 9. Next, the indexing drive shaft 15 moves the turret tool post 9 and the rotation of the turret shaft 6 moves its clutch teeth 15a to a position on the indexing axis A which faces the clutch teeth 44a of the indexing input shaft 43. Be stopped. At this time, the unclamp input shaft 35 is disengaged from the lock member 38,
The indexing drive shaft 15 can enter. The indexing drive shaft 15 is advanced by the movement of the turret tool post 9 and enters the chuck body 31, and the clutch teeth 15a of its own are engaged with the clutch teeth 44a, and the indexing input shaft 43 is pressed to cause the spring 48 to move. The clamp plunger 32 is moved inward in the radial direction at the same time, and at the same time, the clamp plunger 32 is moved outward in the radial direction against the clamp spring 37 via the work W, the clutch member 46 is separated from the clutch member 47, and the work W is clamped. The indexing input shaft 43 is allowed to rotate as it is. Next, the indexing input shaft 43 is set to a desired angle (eg, 18 degrees) of the indexing drive shaft 15.
The work W is indexed and rotated around the indexing axis A while being gripped by the first and second clamp claws 33 and 41 by the rotation of 0 degree) and indexed to a predetermined indexing position. In this way, the work W is stopped with the other machining surface W2 directed toward the approaching direction of the drill 16 (shown in FIG. 7).

Next, as shown in FIG. 8, when the indexing drive shaft 15 retracts to the outside of the chuck body 31, the indexing input shaft 43 is clamped by the spring force of the spring 48 and the unclamping input shaft 35. The work W is moved radially outward while being gripped by the spring force of 37, and the clutch member 46 of itself is engaged with the clutch member 47 of the chuck body 31 to be positioned at a predetermined indexing position. The work W is located on the rotation center line S and the lock member 3
8 moves forward to lock the unclamp input shaft 35, and securely holds the work W with the first and second clamp claws 33 and 41. Then, the chuck body 31 is rotated, and the other surface W2 of the work W is processed by the forward movement of the drill 16 as described above. Of course, depending on the shape of the work W, the rotation angle of the indexing input shaft 43 can be set to an integral multiple of the pitch of the meshing teeth 46a and 47b of the clutch 46A by the rotation of the milling shaft 13.

In another embodiment of the index chuck 1 of the present invention, as shown in FIG. 9, an unclamp input shaft 35A is used instead of the swing lever 36 that swings by the movement of the external indexing drive shaft 15. Connect the clamp plunger 32 to the connecting member 3
It may be integrally connected by 6A. In this case, the clamp spring 3 is attached to the unclamp input shaft 35A as in the previous embodiment.
Instead of mounting 7, the clamp spring 37 directly presses the clamp plunger 32 in the radial direction. Also, the unclamp input shaft 35A and the index input shaft 43
The two drive shafts 14 and 15 for driving the motor may be combined with, for example, the drive shaft 15A attached to one milling shaft. In this case, for example, the tip of the dual-purpose drive shaft 15A corresponds to the corresponding unclamp input shaft 35A and index input shaft 43.
The shape may be such that it can be engaged with. Of course, FIG.
The same applies to those shown in.

In the above embodiment, the lock member 38 is operated by the rotary cylinder, but FIG.
In the embodiment of the invention according to claim 7 shown in FIG. 0, the lock member 38B is movable in the axial direction to the unclamp input shaft 35B which is urged in the clamping direction by the clamp spring 37B interposed between the chuck body 31 and the chuck body 31. Further, it is non-rotatably supported by a key or the like not shown. Chuck body 31
The switching shaft 44A is rotatably supported by the plate 31A attached to the plate 31A, and the screw portion 44B at the end in the radial center direction is screwed into the lock member 38B, and the other end is exposed to the outside of the chuck body 31. Is provided with an engaging portion 44C that can be engaged with and disengaged from the indexing drive shaft 15, which also serves as an external lock drive shaft that engages with the clutch teeth 44a of the indexing input shaft 43. By rotating the indexing drive shaft 15 forward and backward and rotating the switching shaft 44A forward and backward while engaging the switching shaft 44A, the lock end portion 38C of the lock member 38B is moved to the anchor amplifier input shaft 35B. The unclamp input shaft 3 is pressed by pressing against the contact portion 35C.
5B is switched between a locked position for locking the workpiece W in the clamped state and an unlocked position where the lock end 38C is separated from the contact portion 35C. The present invention is compact, lightweight and inexpensive in that no pressurized fluid is used.

[0027]

As described above, according to the invention described in claim 1 of the present invention, the index input shaft is operated by the operation of the external index drive shaft, and the second index drive shaft is operated by the operation of the index input shaft. An index chuck capable of indexing and rotating the clamp claws and indexing a workpiece gripped between the first and second clamp claws without incorporating an indexing drive source for the second clamp claws inside the chuck body. Therefore, the entire chuck can be made compact, and the index chuck can be manufactured at low cost.

According to the third aspect of the present invention, in addition to the above configuration, a second clamp claw is integrally provided at the radially inner end in order to position the indexing position of the second clamp claw.
A large number of clutches are provided on the back surface of the second clamp claw of the indexing input shaft, which is supported by the chuck body so as to be movable in the radial direction and rotatable about the indexing axis, and the chuck body portion facing this back surface. In addition to the effect that the whole chuck can be made compact, the indexing rotation of the second clamp claw is finely divided by an indexing angle which is an integral multiple of the pitch of the engaging teeth of the clutch, that is, The work can be finely indexed and positioned, improving the chuck function.

According to the fourth aspect of the invention, the unclamping of the first clamp claw is performed by the external unclamp drive shaft without having a drive source for unclamping the first clamp claw inside the chuck body. Can be clamped, second
The chuck as a whole can be made more compact in combination with the structure of claim 1 or 2 in which the indexing drive source for the clamp claw is not incorporated.

According to the invention of claim 7, a spring for biasing the clamp plunger in the clamp direction is provided in the chuck body without having an index drive source and an unclamp drive source.
First clamp claw clamp, unclamp operation, second
All the indexing and positioning operations of the clamp claw are performed by the operation of the index drive shaft and unclamp drive shaft outside the chuck body, and the lock member that locks the clamp state of the first clamp claw is also index driven. Since the shaft is operated via the switching shaft, all the operations required for the index chuck can be performed without using fluid, and the rotary cylinder provided at the rear end of the main shaft of the lathe can be omitted.

[Brief description of drawings]

FIG. 1 is an explanatory view of a composite lathe equipped with an index chuck of the present invention.

FIG. 2 is a partial side sectional view of a composite lathe.

FIG. 3 is a cross-sectional explanatory view of the index chuck of the present invention.

FIG. 4 is an IV view of FIG.

FIG. 5 is an operation diagram of the index chuck.

FIG. 6 is an operation diagram of the index chuck.

FIG. 7 is an operation diagram of the index chuck.

FIG. 8 is an operation diagram of the index chuck.

FIG. 9 is another embodiment.

FIG. 10 is an embodiment of the invention according to claim 7;

[Explanation of symbols]

1 index chuck, 14 unclamping drive shaft, 15 indexing drive shaft, 31 chuck body, 32
Clamp plunger, 33 First clamp claw, 3
5 unclamp input shaft, 35C contact part, 35c
Engagement part, 36 rocking lever, 37 clamp spring,
38B locking member, 38C locking end, 41
Second clamp claw, 43 index input shaft, 44b engaging portion, 46A clutch, A index axis

Claims (8)

[Claims] 1. A chuck plunger, which rotatably supports a first clamp claw rotatably around an indexing axis, is slidably supported in a radial direction, and a second clamp claw is attached to the chuck body. Is provided so that it can be indexed around the indexing axis in the radial direction, and the clamp plunger is moved in the radial direction to grip the work between the first and second clamp claws, and the second clamp in the gripped state. In an index chuck for indexing and rotating the claws for indexing, the chuck main body is provided with an indexing input shaft provided with an engaging portion that engages with an indexing drive shaft provided externally. An index chuck characterized in that it is connected to a second clamp pawl so as to be index-rotated by the operation of an index input shaft. 2. The chuck body is provided with a clamp spring for urging the clamp plunger in the clamp direction, and
An indexing input shaft integrally provided with a second clamp claw at the radially inner end is supported rotatably around the indexing axis and movably in the radial direction, and the indexing input shaft is radially outward. 2. The index chuck according to claim 1, further comprising a clutch interposed between the indexing input shaft and the chuck body, the clutch being engaged and disengaged by radial movement of the indexing input shaft. 3. The clutch is provided between the back surface of the second clamp claw and the chuck body portion facing the second clamp claw, and is provided with a large number of meshing teeth at a predetermined pitch in the circumferential direction. The index chuck according to claim 2. 4. An unclamp input shaft having an engagement / disengagement portion that engages / disengages with an external unclamp drive shaft is movably provided on the chuck body, and the unclamp input shaft and the clamp plunger are attached to the unclamp input shaft. The index chuck according to claim 1 or 2, wherein the clamp plungers are linked so as to move in a radial direction upon operation. 5. A swinging structure in which an unclamp input shaft is movably supported in an axial direction parallel to an indexing axis line, and the unclamp input shaft and a clamp plunger are swingably supported by a chuck body. The index chuck according to claim 4, wherein the index chucks are connected by a lever. 6. The unclamp input shaft is movably supported in the axial direction of an axis parallel to the indexing axis, and the unclamp input shaft and the clamp plunger are integrally connected by a connecting member. The index chuck according to 4. 7. A chuck body is provided with an unclamp input shaft having an engagement / disengagement portion for engagement / disengagement with an external unclamp drive shaft so as to be movable in the axial direction, and an unclamp input shaft and a clamp plunger are unclamped. The clamp plunger is linked so as to move in the radial direction by the operation of the shaft, and the chuck body has a lock member that engages and disengages with the unclamp input shaft and locks the clamped state of the clamp plunger. The index chuck according to claim 2, further comprising a switching shaft that is switched between a locked position and an unlocked position when actuated. 8. An unclamp input shaft is movably supported in the axial direction of an axis parallel to the indexing axis, and a lock member is movably provided in the unclamp input shaft in the axial direction. The screw part at the tip of the switching shaft that is rotatably supported is screwed on, the switching shaft is provided with an engaging part that engages and disengages with the indexing drive shaft that can rotate forward and backward, and the unclamp input shaft is locked with The index chuck according to claim 7, further comprising an abutting portion that engages and disengages with the lock end of the member.