JPS60123205A - Work driving center - Google Patents

Abstract

PURPOSE:To secure such chucking force as being powerful and eliminating any shaky motion, by increasing a nipping engagement area of a jaw, while making powerful driving force act on a work. CONSTITUTION:A center hole being made up in one-side end face of a work member is adjusted to fit a tip end of a center piece 8, while the work member is set thereto as thrusting a center of a tailstock into a center hole made up in an end face of the rest other side. At this time, simultaneously with the center piece 8 thrust in, a jaw 11 of each driving plate 10 is nipped in the end face of the work member. Each plate 10 is pushed back by the end face of the work member, and it contacts a taper surface part 13 of a ring 12 whereby the plate 10 is forcibly pressed to the bottom of a groove 9, thus lost motion is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a work driving center.

Since the claws of conventional work driving centers are formed on the tip end surface of a round bar, the biting engagement area of the claws is small, making it impossible to obtain a strong holding force.

In addition, when the diameter of the workpiece becomes larger, one work driving center with many claws must be replaced, which is time consuming and requires the provision of several work driving centers of different sizes. .

Furthermore, since the pawl is stopped from rotating using a small key, it is easily damaged and exposed, and it is not possible to apply a strong drive force. There was also the problem that large scratches were left in between the cuts.

This "protrusion" increases the biting engagement area of the claw, and
The aim is to solve the two problems by making it possible to apply a strong driving force.

In this invention, a senku piece is inserted inward from the center of the tip surface of a base body having a shank at the end, and a groove is provided on the outer radial line of the center piece through which the tip surface of the base body opens. A driving plate with a claw at the tip is slidably inserted, and the driving plate is pressed against the groove by a ring built into the base and a tapered surface part provided on the driving plate. Provide center.

Hereinafter, embodiments of the present invention will be described with reference to the attached FIG. 111].

In the figure, reference numeral 1 denotes a base body with a shank 2 at its end, and a recessed hole 3 is located inwardly from the tip surface of the base l, and a recessed hole 3 is located in the center of the shank 2. A through hole 4 is provided between the ends.

Further, a shaft member having a through hole 5 in the shaft core is fitted and attached to the recessed hole 3VC, and a shaft member that rotates together with the shaft member 6 and is installed in the through hole 4 is inserted into the through hole 5. A freely sliding Senku piece B that is pushed out by a spring 7 has been proposed.

Further, the shaft member 6 is provided with grooves 9 arranged in a radial manner, the depth of which approaches the inner through-hole 5 from the outer circumferential surface, and the distal end surface of the shaft assembly 6 is open.

Although the grooves 9 described above are provided at three equal positions in the illustrated case, they may be provided in more positions.

Further, a driving plate 10 is slidably fitted into each groove 9, and a claw 11 is provided on the leading edge of the driving plate 10.

Further, a ring 12 that moves in the circumferential direction of the base body 10 is incorporated into the base body 1, and the inner circumference of this ring 12 and the outer edge of the driving plate 1o are arranged opposite to the direction of movement of the ring 100 as the driving plate lO is recessed. When the side driving plate 10 is pushed out and the valley driving plate 10 is pulled, the tapered curved portion 1 is formed.
3 is provided.

The tapered surface portion 13 of the driving play (10) is provided by notching the outer edge of the driving play (1-10), and a separation ring 15 is fitted into the annular groove 14 provided on the circumferential surface of the recessed hole 3. ) 10 is engaged with a protrusion 16 provided at the outer end of the plate 10 to prevent the driving plate 10 from coming off.

In addition, as shown in the figure, only the tip of the Senku piece 8 is made into a small bowl, and a driving play (1) is attached to the outer periphery of this small diameter part.
The claw 11 can be made longer by bringing the inner edges of the tips closer together.

In the figure, 17iJ is an annular groove provided on the circumferential surface of the recessed hole 3 so that the ring 12 fits therein. 1B & twisting ring 12' running smoothly Kl##, 19 is a screw whose tip is inserted into the groove 20 on the outer circumference of the end of the center piece 8 to stop the rotation of the center piece 8, 21 is a screw from the end of the through hole 4 A screw 22 screws in to compress the spring 7, a plug 22 closes the end of the through hole 4, and a screw 23 fixes the shaft member 6.

The work driving center according to this invention has the above-mentioned configuration, and one center hole provided at the tip of the center piece 8 is fitted to the tip of the center piece 8 [one end LII of the member], and the other center hole is fitted to the tip of the center piece 8. Set the workpiece r while pushing the center of the tail stock into the hole provided on the end face.

At this time, the Senku piece 8 is pruned by the pusher 17, and at the same time,
Attach the claw 1 of each driving grate 10 to the end face of the temporary workpiece.
1 bites.

The above-mentioned driving plate 10 is pushed back by the ends of the workpiece, and due to the contact between the tapered curved part 13 of the ring 12 and the tapered surface part 13 of the driving plate 10, the inner edge of the above-mentioned driving plate 10 is pushed back to the bottom of the groove 9. Press 4=J to prevent rattling.

As described above, according to the work driving center related to this emitting j, radial 1c is applied to the end 111I of the workpiece.
Since the tip claws of the re-aligned driving plates are bitten and held together, the engagement area is larger than that of round bar claws, and a strong holding chip can be obtained.
Can use powerful Draiguka.

Furthermore, as the driving grate is pushed back, each driving plate can be drawn inward by the tapered curved portion of the ring and the tapered surface portion of the driving grate.

Therefore, it is possible to press the inner edge of the driving plate against the bottom of the groove, thereby eliminating wobbling of the driving plate.

Furthermore, since the driving plate is fitted into the groove, the claws do not rotate even if the workpiece receives a large cutting impact, and the scratches on the claws are small.

[Brief explanation of the drawing]

The drawings show an embodiment of the work driving center according to the present invention, and FIG. 1 is a partially cutaway side view, FIG. cross section,
FIG. 4 is an enlarged longitudinal side view showing the main parts of the same as above.

Claims (1)

[Claims] A base body having a shank at the end, a Senku piece inserted inward from the center of the tip of the base body, a spring inserted into the shank to push out the center piece, and an outer radius of the center piece. A driving plate inserted into each groove, a claw provided on the edge of the driving plate protruding from the front end surface of the base body, and a groove inserted into the base body so as to fit on the outside of the driving plate. In addition, there is a soak driving center consisting of a ring provided by the company that slides in the circumferential direction of the base body, and a tapered turning portion provided to draw the driving plate to the inner periphery of this ring and the bottom of the outer edge 14 of the valley driving plate. .