JPS5918161B2 - Face clamp chuck drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a face clamp chuck for a lathe.

A face clamp chuck has multiple clamping members that rotate around the axis mounted at equal intervals on a circumference concentric with the center of the body on the front of the chunk body that is fixed to the main shaft of the lathe. The front surface of the workpiece is pressed and fixed to the front surface of the main body by this tightening member.

Therefore, it is necessary to have a mechanism that rotates each tightening member around its axis, and a mechanism that presses each tightening member against the workpiece when it is rotated to the front of the workpiece, and both operations are performed at a certain timing. Therefore, a cam groove is provided on the outer circumferential surface of the reciprocating member having a cylindrical outer circumferential surface, and when the retracting member is moved forward and backward with respect to the pin engaged in this cam groove, the retracting member rotates. It is necessary to use a device that moves forward and backward, or a device that moves a member with a pin attached to move forward and backward relative to the moving member, turns this member, and then contacts the pin with the end of the cam groove to move the moving member back and forth together with the pin. .

However, this method of using pins and cam grooves takes time and effort to manufacture the cam grooves.

Due to the strength of the pin, it is difficult to transmit large loads.

There are problems such as the rotation angle cannot be made very large compared to the amount of advance and retreat.

An object of the present invention is to provide a face clamp chuck driving device using a mechanism that eliminates the need for cam grooves and pins as in the conventional motion converting device as described above.

That is, the present invention provides the above-mentioned face clamp chuck, in which a rotatable advancing and retreating member is provided in the hollow main body of the chuck and is moved forward and backward by a drive device such as a hydraulic cylinder.
A working hole in the forward and backward direction is formed in this moving member, and a conical pin that fits into the working hole is fixed to the inside of the front wall and the inside of the rear wall of the main body so that its tip faces toward the moving member. is eccentric along the circumference concentric with the rotation center of the reciprocating member, and when one conical pin is completely inserted into the working hole of the retracting member, the tip of the other conical pin is placed on one side of the end of the working hole. The gear on the outer periphery of the advancing/retracting member is engaged with a pinion gear provided on each shaft so as to be movable in the axial direction, and is rotatably attached to the rear of the advancing/retracting member.What is the advancing/retracting plate and the advancing/retracting member? After the advancing/retracting member retreats a certain amount from the forward position, the advancing/retracting member contacts the advancing/retracting plate and moves back together. are connected so that they move forward and backward together, and when the moving member inside the main body is moved back and forth in the axial direction by a hydraulic cylinder, one side of the end of the action hole of the moving member moves along the slope of the conical pin, causing the movement to move forward and backward. The member rotates and moves to rotate the shafts of each tightening member via pinion gears that mesh with gears on the outer periphery of the member, and these shafts are moved forward and backward together with the tightening members.

Next, the apparatus of the present invention will be explained based on FIGS. 1 to 4.

``The one shown in Figs. 1 to 4 is a lathe chuck A called a face clamp chuck or finger chuck. A plurality of rotatable shafts 2 are attached to the front of the main body 1, and a shaft is attached to the tip of each shaft 2. The clamping member 3 of the workpiece 4 is fixed.

Reference numeral 5 denotes a tubular forward/backward shaft provided in the center of the main body 1, and this forward/backward shaft 5 is moved forward/backward by a hydraulic cylinder (not shown).

Reference numeral 6 denotes a reciprocating member rotatably mounted within the main body 1, and the reciprocating shaft 5 is rotatably fitted into a hole in the center of the retractable member 6.
A collar 7 formed on the outside of the shaft 5 and a bearing ring 8 fixed behind the shaft 5 allow the forward/backward shaft 5 and the forward/backward member 6 to move forward and backward together. Gears 10 meshing with a pinion gear 9 formed closer to each other are formed at regular intervals.

Reference numeral 11 denotes an annular reciprocating plate fitted to the outside of an annular wall 12 on the rear side of the reciprocating member 6 so as to be rotatable and retractable, and is provided with a dowel hole 13 into which each of the shafts 2 is fitted.

This daruma hole 13 has a shape in which a large diameter part a and a small diameter part are arranged in the circumferential direction as shown in FIG.
The small diameter portion is large enough to allow the small diameter portion 15 of the shaft 2 to fit loosely, but the inner end portion 14 does not fit.

Further, a gear 16 is provided on a part of the outer periphery of this reciprocating plate 11 as shown in FIG. A hexagonal punch is inserted into the hexagonal hole at the outer end of the operating shaft 17 so that the operating shaft 17 can be rotated.

Reference numerals 19 in FIGS. 1 to 3 indicate a plurality of conical pins fixed to the inner surface of the front wall of the main body 1.

The pins 19 are arranged at equal intervals on an imaginary circumference concentric with the center of the main body 1 as shown in FIG. are provided so as to correspond to each pin 19.

21 is a rear wall bolted to the rear of main body 1, and this rear wall 2
1, a conical pin 22 is fixed at a position slightly eccentric to each of the conical pins 19.

Both the conical bins 19 and 22 are located on the circumference concentric with the rotation center of the reciprocating member 6, and as shown in FIG.
is in contact with the inner surface of the front wall of the main body 1, and the conical pin 19 is inserted into the working hole 2.
0, the tip of the other conical pin 22 is eccentric to the extent that it rests on one side of the hole 20.

The base of each of the conical pins 1, 9, 22 has a cylindrical peripheral surface that fits into the working hole 20.

In FIG. 2, 23 is a stopper that limits the forward position of the advancing/retracting plate 11, 24 is a push piece that pushes the advancing/retracting plate 11 forward by a restoring spring 25, and 26 is a stand bar fixed between the front wall and the rear wall 21 of the main body 1. The bar 26 is loosely fitted into the arcuate hole of the reciprocating member 6 so as not to interfere with the operation of the member 6.

In the case of the chuck for the lathe described above, each tightening member 3 is oriented horizontally as shown in FIG. The plate 11 is in contact with a stopper 23 as shown in FIG.

At this time, the small diameter shaft portion 15 of the shaft 2 engages with the small diameter portion of each daruma hole 13 of the forward/backward plate 11, and the shaft 2 and the forward/backward plate 11 move forward and backward together, allowing rotation of the shaft 2. It becomes.

In this state, when the workpiece 4 is applied to the front surface of the main body 1 and the hydraulic cylinder (not shown) is operated to move the forward/backward shaft 5 backward toward the left in FIG. 2, the forward/backward shaft 5 and the forward/backward member 6 also retreats.

At this time, as shown in FIG. 3, one side of the rear end of the working hole 20 of the member 60 moves from the tip of the rear conical pin 22 along its slope in the direction of the arrow, so that the member 6 moves toward FIG. Move back while turning to the left.

Therefore, each pinion gear 9 meshing with each gear 10 of member 6 rotates about 90 degrees together with each shaft 2, thereby rotating tightening member 3 to the position indicated by the chain line in FIGS. 1 and 2.

When each tightening member 3 rotates approximately 90 degrees as described above, each rear conical pin 22 deeply enters the action hole 20 of the reciprocating member 6, and the front conical pin 19 has its tip facing one side of the hole 200. It becomes a state of being.

When the reciprocating member 6 further retreats in this state, the action hole 20
moves backward without rotating along the cylindrical peripheral surface of the base of the conical pin 22, and at this time, the rear surface of the outer periphery of the retractable member 6 contacts the front surface of the retractable plate 11 and causes the retractable plate 11 to retreat. At the same time, the shaft 2 and the clamping members 3 move backward, and each clamping member 3 facing inward presses and fixes the workpiece 4 to the front surface of the main body 1.

When the advance/retreat shaft 5 is advanced from the fixed state of the workpiece 4 as described above, each part operates in the opposite direction to the tightening state, and each member 3 moves to the first position.
The workpiece 4 can be removed by returning to the position indicated by the solid line in FIGS.

In addition, in a state where each shaft 2 is moving forward as shown in FIG. 2, turn the operation shaft 1T, rotate the advancement/retraction plate 11 by the pinion gear 18 and gear 16, and rotate the large diameter part a of the daruma hole 130 as shown in FIG. By aligning the shaft 2 with the inner end 14 of the shaft 2, the shaft 2 can be removed from the main body 1 because the inner end 14 can pass through the large diameter section a.

A plurality of working holes 20 are provided in a reciprocating member 6 which is rotatably and reciprocally attached to the main body 1 of a face clamp chuck used for a lathe, and the front wall of the main body 1 and the rear wall 21 of the main body 1 are slightly eccentric in the circumferential direction. When one conical pin 19 or 22 is deeply inserted into the working hole 20, the tip of the other conical pin 22 or 19 faces one side of the working hole 200. As the advancing/retracting member 6 moves back and forth, its working hole 20 and conical pin 19'
In addition, since the advancing/retracting member 6 is configured to rotate due to the sliding movement of the face clamp chuck 22, the action of moving the tightening member 3 of the face clamp chuck forward/backward while rotating can be performed without using a cam or pin. Provides tightening force.

In addition, when using a cam groove, it takes a lot of work, but in the case of the present invention, only a conical pin and a hole to fit it are provided, and the rotation of the advancing/retracting member 6 and the tightening member 3 is transmitted to the gear. The structure is simple because the rotation of the tightening member 30 and the movement back and forth can be accurately timed by the gap between the advancing/retracting plate 11, which advances and retreats together with the shaft 2 of the tightening member 3, and the advancing/retracting member 6. Accurate movement can be obtained regardless of the

In addition, when using a cam groove, it takes a lot of work to work, but in the case of this invention, the work is extremely simple because only a conical pin and a hole to fit it are provided, and the durability is also excellent. effective.

[Brief explanation of the drawing]

Fig. 1 is a front view of a face clamp chuck using the device of the present invention, Fig. 2 is a side view taken longitudinally along the main parts of the above, Fig. 3 is an enlarged sectional view taken along line I-I in Fig. 1, FIG. 4 is an enlarged sectional view taken along the line ■--■ in FIG. 1, and FIG. 5 is a partially cutaway front view of the daruma hole forming portion. 1...Body, 2...Shaft, 3...Tightening member, 6...
・Advancing/retracting member, 9...pinion gear, 10...gear,
11...Advance/retreat plate, 19.22...Conical pin, 20.
...Action hole, 21...Rear wall.

Claims (1)

[Claims] 1. A plurality of tightening members are attached to the front of a hollow chuck body so as to be rotatable and move forward and backward, and a shaft that rotates together with each of the tightening members is rotated by a drive mechanism provided within the main body,
In the face clamp chuck, the reciprocating member is rotatably and retractably attached to the main body, and an action hole is provided in the reciprocating direction, and the reciprocating member is provided inside the front wall of the main body and on the inside of the rear wall of the main body. The conical pin that fits into the action hole is fixed so that its tip faces the reciprocating member, and both conical pins are eccentrically moved along the circumference that is concentric with the rotation center of the retracting member, so that one conical pin advances and retracts. The tip of the other conical pin faces one side of the tip of the working hole when the conical pin is completely inserted into the working hole of the member,
A gear on the outer periphery of the advancing/retracting member is engaged with a pinion gear provided on each shaft so as to be movable in the axial direction, and a advancing/retracting plate is rotatably attached to the rear of the advancing/retracting member. After retracting by a certain amount, the positional relationship is such that the retractable plate contacts the retractable plate and moves backward together, and the retractable plate and the shaft of the tightening member are connected to each other so that they can move forward and backward together in the axial direction, while allowing rotation of the shaft. Driving device for face clamp chuck.