JP2529460Y2 - Chuck claw for automatic change of lathe chuck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a chuck for lathe chuck, in which the chuck claws can be easily attached and detached by an automatic chuck jaw changer.

[Conventional technology]

In the case of mass production of various kinds, it is necessary to exchange chuck claws in small lots in order to cope with a change in the size and shape of the work even in the machining.

For this reason, various types of chuck jaw replacement devices have been conventionally proposed.

For example, an apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 64-20204 has a coupling block fixed to a front portion of a chuck pawl mounting base which is opened and closed by a chuck pawl driving mechanism, and the coupling block is attached to a rear surface of the chuck pawl. A recess in which the block is removably fitted is provided, and a plurality of engaging projections are provided on both front sides of the coupling block and both rear sides of the recess of the chuck pawl, and the chuck pawl is inserted through the recess. Then, the projection on the coupling block side is engaged with the projection on the chuck pawl side, and the chuck pawl and the coupling block are fixed by fixing means such as bolts.

[Problems to be solved by the invention]

The known device as described above has the advantage that the manual replacement of the chuck jaws is extremely easy and can be performed in a short time. However, since the chuck jaws and the connecting block are fixed by fixing means such as bolts, the automatic chuck jaws are required. With an exchange,
There is a problem that can not be replaced well.

An object of the present invention is to solve the problems of the conventional apparatus as described above and to provide an automatic replacement chuck jaw which can be easily replaced by an automatic chuck jaw changer.

[Means for solving the problem]

In order to solve the above problems, the present invention provides a plurality of chuck claw mounting bases which are opened and closed by a chuck claw driving mechanism at a front part of a chuck body, and a coupling block provided at a front part of the chuck claw mounting base. A concave portion in which the coupling block is removably fitted on the rear surface of the chuck pawl; and a plurality of engaging projections provided on both front portions of both sides of the coupling block and both rear portions of the concave portion of the chuck pawl. Are fitted into the coupling block through the recess, the projection on the coupling block side extends from the projection on the chuck claw side to the inner side of the recess, and both engagements correspond to the inner surface of the projection. The lathe chuck jaws for attaching the chuck jaws to the chuck jaw mounting table via a connecting block by contacting the outer end surface of the chuck jaws with the stopper at the outer end of the chuck jaw mounting table while engaging the protrusions. Block The spring is slidably inserted in the front and rear and left and right directions slidably inward and outward in the chuck claw mounting base, and this coupling block is pushed outward to engage the engagement projection of the coupling block with the engagement projection of the chuck claw. When mounted on a claw mount, the outer end of the connecting block is projected to the outer end of the chuck claw mount, and the outer end of the connecting block is pushed to move the connecting block inward. The engaging protrusion of the chuck claw is disengaged from the engaging protrusion of the chuck claw, and the recess of the chuck claw is opened to the outer end surface of the chuck claw so that the coupling block can pass therethrough. With a pin on the mating surface,
The pin is fitted in the recess of the chuck claw to form a long hole that can move in and out, and the fitting of the pin into this long hole prevents the chuck claw from dropping inward to the chuck claw mounting base. This is the configuration.

[Action]

Since the present invention has the above configuration, when attaching the chuck jaws to the chuck jaw mounting base provided on the front surface of the chuck body, the outer end of the coupling block mounted on the chuck jaw mounting base is interlocked with the automatic chuck jaw changing machine. An automatic chuck jaw exchanging machine is pressed by an appropriate pressing means to move the coupling block inward, and the chuck jaws are inserted into the engagement jaws on both sides of the recess between the plurality of engagement projections on both sides thereof. The concave part of the chuck claw supplied from the
When the pressing of the outer end of the coupling block is released in a state where the coupling block and the recess of the chuck claw are completely fitted, the coupling block is displaced outward by one pitch of the engaging projection by the action of the spring. The engagement projections of the chuck jaws engage with each other to join the two. When the chuck pawl is coupled to the coupling block in this way, the pins of the coupling block fitted into the elongated holes of the chuck pawl move to the outer ends of the elongated holes, and the outer end surfaces of the chuck pawls correspond to the mounting base. Since the stopper comes into contact with the stopper, the chuck claw is prevented from falling off.

When the two are separated, they can be easily separated by the reverse operation.

〔Example〕

In the embodiment shown in the drawings, reference numeral 1 denotes a chuck body fixed concentrically to the tip of a main shaft of a lathe (not shown), and a partition plate 4 is sandwiched between a rear member 2 and a front member 3 and integrally fixed by bolts 5. The hydraulic cylinder 6 is formed inside the rear member 2.

The piston 7 in the cylinder 6 advances and retreats due to the passage of hydraulic oil into and out of the cylinder 6, has a spring 8 for pushing the piston 7 backward, and is prevented from rotating by a pin 9 for preventing rotation. .

The rod 10 at the front of the piston 7 protrudes forward from the center hole of the rear member 2 while maintaining the liquid tightness, and a small diameter portion at the rear of the chuck pawl driving member 12 is fixed to the front end thereof by bolts.

The driving member 12 is fitted in the space 14 in the front member 3, and the small diameter portion at the rear thereof is connected to the rod 10 through the hole of the partition plate 4 as described above.

Reference numeral 13 denotes a chuck pawl driving mechanism, the driving member 12, a plurality of exciting sliding balls 15 rotatably mounted on the member 12, and a rear portion slidably fitted in a hole of each ball 15, The intermediate portion is constituted by a plurality of swing members 16 which are swingably mounted on the front wall of the space 14.

At the end of each rocking member 16 is a respective chuck claw mounting base
A work stopper 19 is fixed to the front member 3 opposed to each mounting base 18, and a work positioning block 20 is fixed to the inner surface of each stopper.

A guide groove 17 in the radial direction is provided at a front portion of the mounting base 18, and a rear portion of the coupling block 22 is slidably mounted in the guide groove 17 movably in front and rear, right and left, and slidably inward and outward.

The coupling block 22 is rectangular, and a plurality of engaging projections 24 are integrally formed at a predetermined pitch on both front sides thereof.

Further, a pressing spring 23 is fitted into a concave hole at the inner end of the coupling block 22, and a lid 21 in which the outer end of the spring 23 is fixed to the inner end of the mount 18.
And the outer end a of the block 22 is projected from the outer end of the mounting base 18.

Reference numeral 25 denotes a chuck claw, which comprises a front member 26 and a rear member 27. A recess 28 is provided on the rear surface of the chuck claw 25, into which a front portion of the coupling block 22 fits. A plurality of engaging projections 29 engaging with the engaging projections 24 of the block 22
Are formed integrally at a constant pitch.

A stopper 31 is integrally provided at an end of the chuck claw mounting base 18 for receiving an outer end of the chuck claw 25 at the coupling position, and a pin 32 is fixed to a front portion of the coupling block 22.
A long hole 33 into which the pin 32 is inserted is provided on the inner surface of the hole.

In order to connect the chuck pawl 25 to the connecting block 22, the outer end a of the block 22 is pressed by pressing means (not shown) as shown in FIG. 2 and the engagement projection 24 at the lowermost end in FIG.
The lowermost engaging projections 29 of the chuck jaws 25 are positioned immediately below the chuck jaws 25, and each of the engaging jaws 25 of the chuck jaws 25 supplied from the automatic chuck jaw exchange unit is engaged with each of the engaging projections 24 of the block 22. Between the front of the block 22 and the chuck jaws 25
Of the recess 28 is fitted.

When the front surface of the block 22 comes into contact with the inner surface of the recess 28 in this manner, the engaging projection 24 has reached the inside of the engaging projection 29. twenty two
Is slid outward by the spring 23, the engaging projections 24 overlap the inside of the engaging projections 29, and connect the block 22 and the chuck claws 25.

At this time, as shown in FIG. 1, the pin 32 moves to the outer end of the long groove 33, and the stopper 31 is in contact with the outer end surface 25a of the chuck claw 25.

Further, the chuck claw 25 coupled with the coupling block 22 as described above presses the outer end a of the coupling block 22 to
By moving the same block 22 inward against
It can be easily removed as shown in FIG.

Next, the chucking operation will be described with reference to FIG. 1. First, the hydraulic circuit of the hydraulic cylinder 6 is set to the open side, hydraulic oil is poured into the rear chamber, hydraulic oil in the front chamber is removed, and the chuck pawl driving member together with the piston 7 is released. 12 is advanced to rotate each rocking member 16 to open each chuck claw 25.

Then, after inserting a work (not shown) into each chuck claw 25, the hydraulic circuit of the cylinder 6 is switched to the gripping side, and the driving member 12 is moved backward, whereby the work is gripped by each chuck claw 25.

In this state, the chuck jaws 25
Is mainly received by the stopper 31, and the rotational moment applied to the chuck claw 25 is supported by the contact portions of the plurality of engaging projections 24 and 29.

[Effect of the invention]

This invention is the same as that described in the above-mentioned publication in that, as described above, the chuck claws are detachably attached to a plurality of chuck jaw mounting bases that are opened and closed by a chuck driving mechanism provided on the chuck body via a coupling block. In particular, in the case of the present invention, when the coupling block is slidably mounted on the chuck pawl mounting base and the coupling block is positioned outward by a spring, the engaging protrusion between the coupling block and the chuck pawl is not provided. Engaging, and at this time, the outer end of the coupling block is made to protrude from the outer end of the chuck claw mounting base.
Pushing the outer end of the coupling block to shift the engaging projection of the coupling block by one pitch with respect to the engaging projection of the chuck claw allows the chuck claw to be disengaged only by moving the chuck claw in the axial direction. The attachment and detachment of the chuck pawl by the exchange machine becomes extremely easy.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a lathe chuck embodying the present invention, FIG. 2 is a partially cutaway vertical sectional side view showing attachment and detachment of the chuck pawl, FIG. The figure is a perspective view of the chuck pawl. 1 ... Chuck body, 13 ... Chuck claw drive mechanism, 18 ...
… Chuck claw mount, 22 …… Connection block, 24, 29 ……
Engagement projection, 25: chuck jaw, 28: recess, 31: stopper, 32: pin, 33: long hole, a: outer end of coupling block.

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of chuck pawl mounts 18 which are opened and closed by a chuck pawl driving mechanism 13 are provided at a front portion of the chuck main body 1, and a coupling block 22 is provided at a front portion of the chuck pawl mount 18. The rear surface of the coupling block 22 is provided with a recess 28 in which the coupling block 22 is removably fitted. A plurality of engaging projections 24, 29 are provided on both front portions of the coupling block 22 and both rear portions of the concave portion 28 of the chuck claw 25. The chuck claw 25 is fitted into the coupling block 22 through the recess 28, and the protrusion 24 on the connection block 22 side reaches the inner part of the recess 28 from the protrusion 29 on the chuck claw 25 side. Corresponding to the inner surface of the projection 29, both the engagement projections 24, 29 are engaged, and the outer end surface 25a of the chuck claw 25 abuts against the stopper 31 of the outer end of the chuck claw mounting base 18, Chuck claw
A lathe chuck jaw for attaching 25 to the chuck jaw mounting base 18 via a joint block 22; A spring 23 that pushes the coupling block 22 outward to engage the engagement projection 24 of the coupling block 22 with the engagement projection 29 of the chuck claw 25 is attached to the chuck claw mounting base 18, and the outside of the coupling block 22 is removed. The end a is projected to the outer end of the chuck claw mounting base 18,
Push the outer end a of this connecting block 22 to
When the inward movement of the engagement block 24
Is located at a position disengaged from the engaging projection 29 of the chuck claw 25, and the recess 28 of the chuck claw 25 is open to the outer end surface 25a of the chuck claw 25 so that the coupling block 22 can pass through. A pin 32 is provided on the mating surface of the chuck 22, and the pin 32 is fitted in the recess 28 of the chuck claw 25 to form an elongated hole 33 movable inward and outward. A chuck claw for automatic replacement of a lathe chuck, wherein the chuck claw 25 is prevented from dropping in an inward direction with respect to the chuck claw mounting base 18 by fitting of the chuck claw.