JPH0135766Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is applicable to three-jaw chucks and four-jaw independent chucks such as scroll chucks, outlet link chucks, lever-type or wedge-type power chucks. The present invention relates to an improvement proposal for top jaws (also called hard nails) or soft jaws (also called natural nails) used for nail chucks, etc.

[Conventional technology]

The generally popular scroll chuck claw has a master jaw that meshes with the scroll teeth.
There are two types: one in which a soft jyo is bolted, and one in which a top jyo with a multi-stage workpiece gripping surface is bolted.

The difference between a top jyo and a soft jyo is whether or not the workpiece gripping surface is attached in advance (a pre-attached one is a top jyo), but in any case, with a conventional top or soft jyo, the workpiece gripping surface is attached to the jyo body. Since it was attached directly to the workpiece, as the workpiece changed, the entire body had to be replaced with one that had a gripping surface that matched the shape of the workpiece.This resulted in a lot of time and economic loss during replacement work, and it was also difficult to replace the jyo after replacement. Since the centering accuracy is also likely to be lost, the applicant has proposed to solve this problem by fitting an independent block into a groove provided in the top or the end of the main body of the soft jaw and bolting it to the main body. Utility patent application 101616/1989 to create a top or soft jaw that can handle changes in the workpiece by simply replacing the block by attaching a workpiece gripping surface.
I proposed it in the issue.

[Problem that the invention attempts to solve]

However, in the top or soft jaw of the earlier application, the independent block was fixed to the main body using a bolt that had to be removed from the main body, so it was not possible to replace the block with a so-called one-touch operation, and it was not possible to further shorten the work time. It was not possible to fully meet the demands.

This invention aims to solve such problems.

[Means for solving problems]

Among the technologies proposed in Utility Application No. 101616/1986,
A recess is provided at the end of the body of the jyo, which is open to the top and end faces, and the entrance on the end face is narrower than the inside, and this recess is used as a groove into which the independent block is inserted and fitted from the top face. include.

This invention provides a clamp fitting on the upper surface of the main body of the top or soft jaw constructed in this manner, which can be rotated around the bolt to the main body and can be retracted from above the block by this rotation. The top surface is clamped.

[Effect]

The independent block is prevented from coming off toward the end surface of the main body by engaging with the recess, and therefore can be integrally fixed to the main body as long as it is prevented from coming off toward the top surface. This invention uses a clamp fitting instead of the conventional bolt to prevent it from coming off, and the fitting is retracted from the block when the tightening bolt is slightly loosened and rotated to a certain angle, making it easier to attach and remove the block. It is possible to simplify and speed up the process.

〔Example〕

The attached figure shows an example of the application of this invention to a soft jacket.

The soft jacket shown in FIGS. 1 to 3 has an open top surface 11 and an end surface 12 at both ends of the main body 10,
The entrance on the end side is narrower than the inside recess 13,1
4, and independent blocks 15 and 16 are installed in the recesses.
are inserted and engaged in a state in which a portion thereof protrudes outside from the end face side entrance, and is clamped with a clamp fitting 17.

Each clamp fitting 17 is attached to the upper surface of the main body 10 using a tightening bolt 18 that is inserted into a counterbore hole 17a and locks the head. The bolts 18 at this time may be screwed into any location on the top surface of the main body 10, but it is common that the main body 10 is provided with two stepped holes 19 through which the fixing bolts to the master jaw are passed. Therefore, it is desirable to screw it into the opening of the hole 19. In addition to eliminating the decrease in rigidity of the main body and increase in machining time due to drilling extra holes,
8 functions as an end plug for hole 19, the rotational torque of the chuck is also reduced. That is, it has been confirmed through experiments that if the hole 19 is open, the air resistance increases when the chuck rotates, but this can also contribute to preventing this.

There are two types of clamp fittings 17 that can be considered: one in which the outer peripheral surface is eccentric with respect to the axis of the hole 17a, and one in which a notch is provided on the outer peripheral surface concentric with the axis of the hole 17a that overlaps with the peripheral edge of the block. However, in any case, this metal fitting 17 has a long part that reaches above the block and a short part that does not reach the top of the block, and when the long part comes off the top of the block by rotation at a predetermined angle, the block 15 , 16 can be inserted into and removed from the recesses 13 and 14. This metal fitting 17 generates a clamping force by rotating the bolt 18 in the forward and reverse directions by only a few tens of degrees, or is allowed to rotate around the bolt 18. Therefore, compared to the JIYO of the previous application, the workability is improved. There is a huge difference in time.

Note that it is sufficient that the independent block is provided on one side of the main body 10. The shape of the block and the recess that engages it in plan view includes the shape shown in Figures 4 to 7 (in these figures, the recess is designated with the same reference numeral 13 and the block is designated with the numeral 15). It may be determined arbitrarily.
When both the block and the recess are basically circular or polygonal in plan view, a plurality of workpiece gripping surfaces 20 can be provided for one block. However, if the block is based on a circle, it is necessary to prevent the block from rotating. This detent may employ a key and keyway, or may be provided by block 16 in FIG.
It is also possible to make the block long enough to protrude toward the upper surface of the main body 10, provide a clamp engagement groove 16a in the protrusion, and lock the clamp fitting 17 in this groove.

Further, as can be seen from the block 16 in FIG. 2, a conical protrusion 21 is provided on either the bottom surface of the block or the surface of the recess in contact with this, and a conical recess 22 corresponding to the protrusion is provided on the other side. This can also be said to be effective because the centering accuracy of the block can be improved regardless of the machining accuracy of the recess and the block.

Reference numeral 23 in FIGS. 1 and 2 indicates a serration that engages with the serration of the master jaw. Further, 24 is an insertion hole for a fastening bolt used when the fastening force to the main body is more important than the ease of attaching and detaching the block, and this hole is provided as necessary.

〔effect〕

As described above, according to this invention, the block engaged in the recess at the end of the main body can be rotated around the tightening bolt to the main body, and this rotation causes the clamp fitting to be retracted from above the block to be attached to the upper surface of the main body. Since the block is mounted on the block and clamped from above, workability is much improved compared to the bolts of the previous application, which required removal, and the block can be replaced quickly in just a few seconds.

In addition, the features of the prior application, namely, there is no need to attach or detach the jyo main body when changing the workpiece, and therefore there is no need to adjust the assembly accuracy with respect to the master jyo, and parts management is only possible with blocks. The characteristics of easy and economical management can be utilized as is, and the contribution to improving productivity will increase, especially in the production of a wide variety of products and small batches.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of an example of a soft jyo to which this invention is applied, Fig. 2 is a sectional view of its assembled state, Fig. 3 is a plan view, and Figs. 4 to 7 are recesses. FIG. 3 is a plan view showing a modified example of the block. 10...Body, 13,14...Recess, 15,1
6...Block, 17...Clamp fitting, 18...
...Tightening bolt, 19...Stepped hole for passing the fixing bolt, 20...Work gripping surface.

Claims (1)

[Claims for Utility Model Registration] (1) A recess is provided at the end of the jyo main body that is open on the top surface and the end face, and the entrance on the end face side is narrower than the middle side, and a block independent from the jyo main body is provided as described above. In a top or soft jyo, which is inserted and engaged with a part of the recess protruding from the end side entrance, and has a workpiece gripping surface attached to this independent block, the top surface of the jyo main body is provided with a screw for tightening the workpiece to the main body. A top or soft jaw for a claw chuck, characterized in that it is provided with a clamping metal fitting which can be rotated around a bolt and can be retracted from above the block by this rotation, and the upper surface of an independent block is clamped by this metal fitting. (2) The tightening bolt of the clamp fitting is screwed into the opening of a bolt hole for fixing to the master jyo provided in the jyo body, and also serves as an end plug of the fixing bolt hole. A nail top or soft jaw for a nail chuck as set forth in claim (1) of the utility model registration. (3) A conical protrusion for centering is provided on either the bottom surface of the independent block or the inner surface of the recess in contact therewith, and a conical recess corresponding to the protrusion is provided on the other side. A nail top or soft jaw for a nail chuck as set forth in claim (1) or (2) of the utility model registration.