JPH1148010A - Jaw holder for soft jaw for chuck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jaw holder for which a replacing jaw can be easily manufactured, in which the replacing jaw can be replaced easily and in a short time, and which can hold the cheap jaw in the knocked-down type soft jaw for chuck attached to a chuck of, for example, lathes. SOLUTION: In a jaw holder 3b for holding a replacing jaw 3a manufactured from a square bar such as square bar, hexagonal bar, a holder part H provided with a fitting groove (m) into which a part of a replacing jaw 3a is fitted and which holds the replacing jaw in the direction of holding a work so that it cannot be slipped off, a slitting groove (s) connected to the fitting groove (m), and clamping bolts 5 which are to be inserted in the direction of intersecting the slitting groove (s), is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling type raw jaw for a chuck attached to a chuck such as a lathe.

[0002]

2. Description of the Related Art Conventionally, a chuck of a lathe or the like is provided with a plurality of raw claws for clamping a work. In many cases, a work to be processed is clamped by these raw claws. In addition, since it takes a long time to replace the raw nail, an assembled raw nail in which only the sandwiching portion can be replaced is known. For example, Japanese Utility Model Application Laid-open No. Sho 57-105103 discloses a technique in which a work clamping piece (exchange claw) on the work clamping side is made detachable from a main body mounting portion (claw holder). In JP-93806, a support member (exchange claw) detachable from an attachment member (claw holder)
, A plurality of arc-shaped holding portions having different shapes are formed, and the mounting member (claw holder) is changed while changing the direction of the support member (replacement claw).
By mounting, a plurality of different workpieces having different diameters can be held.

[0003]

However, in the prior art, it is not so easy to produce a tightening piece or a support member (exchange claw), and it is difficult to produce a main body mounting portion or a mounting member (claw holder). When attaching a fastening piece or a support member (exchange claw), the two parts are directly connected to each other with a bolt or the like, so it is necessary to completely remove the bolt or the like at the time of replacement, which takes time and labor. There is a problem.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a claw holder in which a replacement claw can be easily attached and detached, the replacement work can be shortened, and an inexpensive replacement claw can be applied. Aim.

[0005]

According to the present invention, in order to achieve the above object, according to the present invention, there is provided a claw holder for a raw claw for a chuck, wherein a replacement claw formed of a square member is held by a holder portion. The holder portion is provided with a fitting groove for fitting the replacement claw irremovably in the direction of holding the work (in the direction perpendicular to the turning shaft).

[0006] When the replacement claw is fitted in the fitting groove, a part of the claw protrudes inward from the inner end face of the claw holder, and the work is clamped by the protruding portion. If the replacement claw is made incapable of being pulled out in the direction of clamping the work, there is no trouble that the replacement claw falls without supporting the replacement claw by hand at the time of the replacement work, and the work is easy. Further, as a cross-sectional shape of the fitting groove for this purpose, for example, a shape corresponding to a part of the cross-sectional shape of the square bar is formed, and a maximum width portion of the cross-sectional shape is formed deeper than the groove opening, and the width of the groove opening is formed. To be narrower than that.

The replacement claw fitted into the fitting groove can be fixed by, for example, tightening, pressing, or any other means.

[0008] Further, since the replacement claw to be applied is made of a square bar, for example, a commercially available square bar or the like can be used.
It is simple. Here, for example, a triangular lumber, a square lumber,
Hexagonal materials, octagonal materials and the like are optional, but generally commercially available square materials and hexagonal materials are easily available and convenient.

[0009] Incidentally, among such square bar replacement claws,
For example, if a plurality of arc-shaped holding portions having different diameters are formed on each top portion of the square bar, each side portion of the square bar, or the like, a plurality of different-diameter workpieces can be held simply by changing the direction of the replacement claw.

That is, for example, in the case of a square bar, if it is formed at each end of each top of the square bar, a maximum of eight different-diameter arc-shaped holding portions can be formed.
Arc-shaped holding portions of different diameters can be formed at several places.

According to a second aspect of the present invention, the holder is provided with a slot which is continuous with the fitting groove and a fastening member which is inserted in a direction crossing the slot. Thereby, the fitting groove can be expanded and contracted.

When the replacement claw is mounted, the replacement claw is fitted into the fitting groove and tightened by a fastening member, so that the fitting groove is condensed and fixed. Also, when replacing the replacement claw, it can be replaced simply by loosening the tightening member and expanding the fitting groove, and the time for completely removing the tightening member can be shortened,
The operation is also easy.

[0013]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a perspective view showing a state in which a raw claw is attached to a chuck, FIG. 2 is a perspective view for explaining an assembling structure of the raw claw, FIG. 3 is a perspective view showing an example in which a replacement claw is formed from a square material, FIG. 4 is a structural example diagram of a claw holder for holding hexagonal material replacement claws.

The raw jaws for chucks according to the present invention are, for example, three pieces provided on a chuck 1 such as a lathe as shown in FIG.
It can be attached to a set of movable members 2, and this movable member 2
It is movable in the direction perpendicular to the rotation axis in synchronization with the rotation of a spiral groove called a scroll (not shown) so that it can be expanded and contracted.

The raw claw 3 can be attached to the movable member 2 by a bolt 4 or the like, and is divided into a replacement claw 3a on the work holding side and a claw holder 3b on the apparatus mounting side. The claw holder 3b allows the replacement work of the replacement claw 3a to be particularly easily performed, and allows the inexpensive replacement claw 3a to be applied.

That is, the replacement claw 3a of the present embodiment has an extremely simple form of basically cutting a square bar having a square cross section to a predetermined size. For example, a commercially available square bar, hexagonal bar, or the like is not hardened. If a steel material is obtained, a user or the like can easily produce arc-shaped holding portions r,...

On the other hand, as shown in FIG. 2, a holder portion H capable of holding the replacement claw 3a is provided on the inner end surface side of the claw holder 3b, and the holder portion H has a fitting groove m, It is composed of a slot s and fastening bolts 5 as fastening members. The shape of the fitting groove m is the replacement claw 3a.
When the square member is a square member, for example, as shown in FIG. 2, the shape of the fitting groove m is made a part of the square, and the replacement claw 3a is fitted. At the same time, one top of the replacement claw 3a is made to protrude inward from the inner end face of the claw holder 3b, and the fitted replacement claw 3a is pulled out inward (in the direction of clamping the work). I try not to.

That is, the fitting groove m is adapted to be able to fit at least two opposing top portions having the maximum width in the cross-sectional shape of the replacement claw 3a, and to connect the two top portions. The diagonal line is located at a position deeper than the groove opening, and the width of the groove opening is smaller than the maximum width.

The above-mentioned split groove s is formed so as to cut from the corner at the center bottom of the fitting groove m toward the back. A pair of tightening holes t, t which penetrate the slit groove s are formed in a direction perpendicular to the slit groove s, and the tightening bolt 5 is inserted into the tightening holes t, t. And can be tightened. That is, of the fastening holes t penetrating the slit groove s, one hole sandwiching the slit groove s is tapped as a screw hole to be screwed into the screw portion of the fastening bolt 5.

For this reason, the fastening bolts 5,
5 is inserted and tightened, the groove width of the fitting groove m is narrowed and condensed. When the fastening bolts 5 and 5 are loosened, the groove width of the fitting groove m is widened.

By the way, for example, FIG.
Can be formed as shown in FIG. These arc-shaped holding portions r can be appropriately processed by the user according to the diameter of the work and the like. For example, in the case of a square material, up to eight locations can be provided at both ends of the four tops. In order to be able to clamp various kinds of workpieces,
It is also possible to form each of the arc-shaped holding portions r with different radius diameters and the like.

In this case, if the direction of the insertion direction of the replacement claw 3a is changed, or the replacement claw 3a is rotated using the insertion direction as a rotation axis, the diameter of the arc-shaped holding portion r facing the holding surface side is changed. Any workpiece that matches the diameter can be clamped.

The operation and the like of the above-described jaw holder of the raw jaw for chuck will be described. The claw holder 3b is fixed to the movable member 2 of the chuck 1 with bolts 4 and 4. The replacement claw 3a is fitted in the fitting groove m of the claw holder 3b. At this time, of the plurality of arc-shaped clamping portions r of the replacement claw 3a, the desired arc-shaped clamping portion R is set to be located on the front side. When the replacement claw 3a is fitted in the fitting groove m in the mounting work of the replacement claw 3a, the replacement claw 3a does not drop even when the opening of the fitting groove m is in the downward position, and the work is easy. is there.

In this state, the work is set at a predetermined position, the movable member 2 is moved inward in the radial direction, and the end of the work is held by the arc-shaped holding portion r of the replacement claw 3a. .

During the machining, for example, when the type of the workpiece is changed and the diameter of the arc-shaped holding portion r is to be changed, or when the replacement claw 3a is replaced due to wear or the like, the tightening bolt 5 is operated. The replacement claw 3a is loosened until it can be pulled out of the fitting groove m. Then, after the replacement claw 3a is extracted, the posture is changed and reinserted as necessary, or a new replacement claw 3a is inserted, and then tightened and fixed again with the tightening bolt 5.

The work such as replacement is performed by tightening the bolt 5
Without having to completely remove and reinsert
Since only loosening is required, the work is extremely easy and the time can be reduced.

Further, since the replacement claw 3a can be easily manufactured by obtaining a commercially available square lumber, it is inexpensive and convenient.

In the above-described embodiment, the case where the replacement claw 3a is a square member is illustrated and described. However, a hexagonal member as shown in FIG. 4 or another square member may be used. However, as the square member of the replacement claw 3a, a square member and a hexagon member are particularly preferable because they are generally commercially available and can be obtained at low cost.

When a hexagonal material or the like is used, for example, as shown in FIG. 4, the maximum width portion of the cross-sectional shape is positioned deeper than the groove opening of the fitting groove m, and the width of the groove opening is further increased. Make it narrow to prevent it from slipping out in the pinching direction. In this case, for example, if arc-shaped holding portions r,... Are formed at both ends of each side, a maximum of 12 arc-shaped holding portions, r,.
Can be provided.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as that described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention. For example, the number and position of the fastening bolts 5 are arbitrary.

[0031]

As described above, the claw holder for a raw claw for a chuck according to the present invention forms a holder portion for fitting an exchange claw formed of a square material as described in claim 1, and this holder portion is formed as follows. Since the fitting groove is formed for fitting the replacement claw in the work holding direction in such a manner that the replacement claw cannot be pulled out, the replacement claw can be easily mounted. By the way, by using such a nail holder, it becomes possible to manufacture a replacement nail from a square piece, and such a square piece can be easily and inexpensively obtained, and the number of pieces that can be clamped per piece is greatly increased. It is convenient because it can be increased. In addition, it is possible to easily manufacture the holding portion for the square bar without using a special milling machine or the like. Further, as in claim 2, as the holder portion, a slot which is continuous with the fitting groove, and a tightening member which is inserted in a direction perpendicular to the slot, are provided, and by the tightening operation of the tightening member, Since the fitting groove is made freely expandable and contractible, it is only necessary to loosen the tightening member when replacing the replacement claw, so that the working time is shortened and the operation is easy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a raw claw is attached to a chuck.

FIG. 2 is a perspective view for explaining an assembly structure of a raw nail.

FIG. 3 is a perspective view showing an example in which the replacement claw is formed from a square material.

FIG. 4 is a structural example diagram of a claw holder for holding a hexagonal material replacement claw;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Chuck, 3 ... Raw nail, 3a ... Replacement nail, 3b ... Claw holder, 5 ... Tightening bolt, H ... Holder part, m ... Fitting groove, r ...
Arc-shaped holding portion, s: slot, t: fastening hole.

Claims (2)

[Claims] 1. A claw holder for a raw claw for chuck, wherein a replacement claw made of a square material is held by a holder, wherein the holder is configured to prevent the replacement claw from being pulled out in a direction of clamping a work. A claw holder for a raw claw for a chuck, comprising a fitting groove for fitting. 2. The claw holder for a raw claw for a chuck according to claim 1, wherein said holder portion is provided with a slot which is continuous with said fitting groove, and is fastened in a direction intersecting said slot. A claw holder for a raw claw for a chuck, comprising a member, wherein the fitting groove is made freely expandable and contractable by a tightening operation of the tightening member.