JPH035368Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a collection chuck for a workpiece.

[Prior Art] Conventionally, in the case of a workpiece collection chuck, only opening and closing operations are performed, or even if advancing/retracting and opening/closing are performed, advancing/retracting and opening/closing are performed separately in two operations. .

[Problems to be solved by the invention] As with the conventional technology, it is inconvenient to attach and detach the workpiece by only opening and closing the workpiece collector chuck, and even if the workpiece is moved forward and backward and opened and closed, it requires two operations. In terms of operation, manual operation is troublesome, and automatic operation requires two actuators, making it unavoidable to be complicated and large.

This invention is designed to eliminate the troublesome operations and the complexity and size of the device as described above, and to allow the collection chuck to be moved forward and backward and opened and closed in a single operation.

[Means for Solving the Problems] The collect chuck according to this invention has a collect sleeve attached to the base body so as to be slidable forward and backward, a collet inserted through the collect sleeve so as to be slidable forward and backward, and a collet attached to the base body. On the other hand, it is composed of a forward spring that biases the collet in the forward direction, and a clamp spring that biases the collet sleeve in the forward direction relative to the collet so as to close the collet. It is provided with a collet opening/closing space in which the collet sleeve can be retracted against the clamping spring, and an engaging means with which the two engage with each other when the collet sleeve is retracted.

[Function] When the spring force of the forward spring is greater than the clamp spring force, the above-mentioned collect chuck will not collect the collet due to the extension action of the forward spring and the clamp spring when the collect sleeve is released. The sleeve is also in the advanced position and the collet is in a gripping condition. By retracting the collet sleeve, the clamping spring is first compressed and the collet is released, and then the advancing spring is compressed by engagement of the engaging means, and the collet sleeve retracts together with the collet.

When the collet sleeve is released, the collet sleeve is first moved forward together with the open collet by the engagement of the engaging means due to the elongation action of the advancing spring, and then the collet is moved forward by the elongation action of the clamping spring. The sleeve moves forward and grips the collet.

If the spring forces of both springs are opposite in magnitude, in the retracting operation of the collect sleeve, first the forward spring is compressed and the collet is retracted together with the collet sleeve while being gripped via the clamping spring. The clamping spring is then compressed and the collet is opened. In the release operation of the collet sleeve, the collet is first brought into a clamped state by the extension action of the clamping spring, and then the clamped collet moves forward together with the collet sleeve by the extension action of the advance spring.

[Example] An embodiment of this invention will be described according to the drawings.

Figure 1 shows the collection chuck 1 according to this invention.
The following is an outline of the case when equipped on a lathe. A hollow rotating spindle 2 is rotatably mounted on the headstock of the lathe,
Moreover, the fixed main shaft 3 is installed concentrically through the hollow hole of the rotating main shaft 2. A collet chuck 1 is mounted on a bracket 4 extending from the headstock in coaxial relationship with the fixed spindle 3, facing the same.

A driving pin 5 is attached to the tip of the rotating main shaft 2 at an eccentric position so as to protrude elastically. A clamp rest 6 is attached to the tip of the fixed main shaft 3, and the clamp rest 6 has a V-groove that supports one end of the shaft of the workpiece on the rotation axis, and a pressure force that elastically presses and secures the coaxial part to the V-groove. A spring is provided.

The collet chuck 1 has a structure shown in FIG. 3 (workpiece gripping state) and FIG. 4 (workpiece release state), and its collet 7 grips the other end of the shaft of the workpiece on the rotational axis.

A collector sleeve 9 is slidably inserted into a sliding hole 8 formed in the bracket 4. A tapered hole 10 is formed at the front end of the through hole of the collet sleeve 9, and a tapered hole 10 is formed in the middle of the through hole to engage with the shoulder surface of the collet 7 to close the collet 7. A two-step portion 12 is formed.
As shown in FIG. 2, the rear half of the collect sleeve 9 is formed into a guide rod portion 13 that is branched into a plurality of branches (four in the figure).

A sliding hole 8 is provided at the rear end of the sliding hole 8 of the bracket 4.
A lid body 15 having an insertion portion 14 is attached, and the guide rod portion 13 is inserted into the groove of the insertion portion 14 and the lid body 15.
It penetrates through the hole and protrudes from the lid body 15. A male threaded portion 16 is formed on the outer peripheral surface of the rear end of the guide rod portion 13 group, and an operating knob 17 is screwed and fixed to the male threaded portion 16.

The collet 7 and a collet rod 18 with a collar extended and fixed to the rear end are inserted into the collet sleeve 9, and the rear end of the collet rod 18 is connected to the lid 15.
A collector clamping force adjustment knob 20, which has a cylindrical portion 19 of an appropriate length that protrudes beyond the operating knob 17 and fits into the collector rod 18, is screwed so as to be freely adjustable forward and backward through the central hole of the collet.

Collet rod 16 collar 21 and collector sleeve 9
A clamping spring 22 is fitted between the first stage part 11 of the through hole, and a forwarding spring 23 is fitted between the collar 21 and the insertion part 14 of the lid 15, both of which are compressed. It's a spring. Then both springs 22, 23
When the lever is opened, that is, when the workpiece is gripped (see FIG. 3), the collet rod 16 advances until the front end of the cylindrical portion 19 of the clamping force adjustment knob 20 comes into contact with the lid 15, and the A gap exists between the first step portion 11 and the collar 21 of the collet rod 16, which corresponds to the distance that the collet sleeve moves forward and backward for opening and closing the collet.

Spring force of clamp spring 22 and forward spring 23
It is preferable to establish a magnitude relationship between the spring force and the spring force, and two cases can be considered.

The operating knob 17, ie, the collet sleeve 9, may be moved forward or backward manually by the operator, but may also be operated by a hydraulically driven or electric actuator (not shown).

In the case of the above lathe, the workpiece consists of a shaft and a rotating body attached to the shaft with a bearing, and the rotating body is turned with reference to the bearing.

The operation and function of the collect chuck installed on the lathe mentioned above will be explained.

Initially, the collet sleeve 9 is in the released state, and both the collet 7 and the collet sleeve 9 are in the forward position due to the extension action of the advancing spring 23 and the clamping spring 22, so that the collet 7 is in the gripping state.

It is assumed that the forward spring 23 has a larger spring force than the clamp spring 22. Therefore, when the operating knob 17 of the collect chuck 1 is pulled, the clamping spring 22 is first compressed by the first step 11, and the collect sleeve 9 is moved until the second step 12 comes into contact with the collar 21 of the collect rod 18. It moves backward and the collector 7 is released. Furthermore, the collet sleeve 9 compresses the advancing spring 23 with the collar 21 by the engagement between the second step portion 12 and the collar 21 of the collet rod 18, and the collet 4 and the collet rod 18 are compressed by the guide rod portion 13. The base surface 24 is moved back until it comes into contact with the front end of the insertion portion 14 of the lid 15 (see FIG. 4).

Here, the workpiece is carried into the space between the end of the spindle and the tip of the collect chuck, and one end of the shaft of the workpiece is inserted between the V groove of the clamp rest 6 of the fixed spindle 3 and the pressure spring, and the workpiece is attached at the same time. Release the operating knob 17 of the collector chuck 1. Then, the front end of the cylindrical portion 19 of the clamping force adjustment knob 20 moves toward the cover body 15 due to the extension of the spring 23 for advancing the entire collet chuck.
The other end of the shaft of the workpiece is inserted into the open collet. Then, the clamping spring 22 is expanded to release the collect sleeve 9.
only moves forward, and the taper hole 1 of the collect sleeve 9
0 engages the shoulder surface of the collet 7, and the collet 7 grips the shaft of the workpiece.

In this state, when the rotating main shaft 2 is driven to rotate, the rotating body of the workpiece is rotated around the bearing by the drive pin 5 engaged with a recess provided at an appropriate location in the rotating body of the workpiece, and the rotating body of the workpiece is rotated around the bearing. Turned in reference.

After completion of turning, pulling the operating knob 17 of the collect chuck 1 acts as already described, causing the collect chuck 1 to release the workpiece and subsequently retract. The workpiece is then removed from the clamp rest 6.

In cases other than the case of the lathe described above, when it is necessary to grip and release the workpiece at the retracted position of the collect chuck 1, the clamping spring 22 has a larger spring force than the forwarding spring 23. In that case, the clamping spring 22 and the advancing spring 2 for the extension and compression of the springs in the above-mentioned action are used.
3 is reversed, and the collet moves forward and backward while remaining in the grasped state.

Turn the clamping force adjustment knob 20 to collect the rod 1.
By adjusting the mounting position relative to 8 back and forth, the distance between the first stage portion 11 of the collect sleeve and the collar 21 of the collet rod when the clamping spring 22 is released is adjusted, thereby adjusting the clamping force of the collet chuck. be able to.

In the above embodiment, the collet chuck according to this invention is applied to a lathe when turning a workpiece based on the bearing, but when performing forward and backward operations of the collet chuck itself and opening and closing operations of the collet, appropriate machining is required. It can be applied to machines.

[Effects of the invention] The collect chuck according to this invention can move forward and backward, and can also grip and release workpieces in the forward or backward position, and is suitable for various manual and automatic loading and unloading conditions. Correspondingly, it can take either form. Moreover, two types of operations, forward/backward movement and gripping/releasing the workpiece, can be performed in one operation in the case of manual operation, and one operation in the case of automatic operation.
Since it can be performed with one actuator,
It is easy to operate, and the structure can be made compact, leading to lower costs.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional front view of a lathe to which a collector chuck according to an embodiment of this invention is applied, FIG. 2 is a partial perspective view of a collect sleeve of a collector chuck according to an embodiment of this invention, and FIG. FIG. 4 is a cross-sectional front view of the collector chuck according to the embodiment of the present invention showing the collet in the clamped and advanced state; FIG. 1: Collet chuck, 2: Rotating main shaft, 3: Fixed main shaft, 4: Bracket, 5: Drive pin, 6: Clamp rest, 7: Collet, 8: Sliding hole, 9:
Collet sleeve, 10: Tapered hole, 11: First
Step part, 12: Second step part, 13: Guide rod part, 14:
Insertion part, 15: Lid body, 16: Male thread part, 17: Operation knob, 18: Collet rod, 19: Cylindrical part, 21:
Tsuba, 20: Clamp force adjustment knob, 22: Clamp spring, 23: Advance spring, 24: Base surface.

Claims (1)

[Scope of utility model registration request] A collet sleeve is attached to the base so that it can slide forward and backward, a collet is inserted through the collet sleeve so that it can be slid forward and backward, a forward spring that biases the collet in the forward direction relative to the base, and a spring that urges the collet in the forward direction with respect to the base. and a clamping spring that biases the collet sleeve in the forward direction against the collet so as to close it.
A collet opening/closing space is provided between the collet sleeve and the collet, in which the collet sleeve can be retracted against the clamping spring, and an engaging means is provided for mutually engaging the collet sleeve when the collet sleeve is retracted. A collect chuck for workpieces that have been used.