JPS6334805Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention adjusts the opening degree of the chuck pawl that grips or releases pipes by reversible rotation according to the outer diameter of the pipe, and The purpose of this is to prevent failures.

As shown in the drawing, a chuck holder 5 is provided whose center corresponds to the center of the die head main body, so that the die head main body and the chuck holder can be moved relatively close to each other. A plurality of chuck shafts 6 are freely rotatably arranged at equal angular intervals on a virtual circle around the
Each chuck shaft is connected to one internal gear 1.
A screw cutting machine is known in which a chuck pawl 13 is tightly fitted onto each chuck shaft 6 and has an eccentric arc-shaped chuck surface 14 that approaches the center sequentially as the chuck shaft 6 rotates in one direction. . The thread cutting machine passes the pipes P through the arrangement center O of the chuck pawl 13, starts the reversible motor M, and rotates the internal gear 10 in the direction of the arrow a in FIG. 2 using the final gear 12 of the reduction system. , after the pipes P are moved to the center and gripped, and the threading or cutting of the pipes P is completed, the motor M is driven in the opposite direction to the above, and the chuck claws 13 are expanded to open the pipes. Therefore, in both models that rotate the die head body and models that rotate the chuck, the pipes gripped at the center O by the chuck pawl 13 are subject to torque in the tightening direction of the chuck pawl, so that they may slip and rotate involuntarily. , will never be released.

However, in the above-mentioned known machine, even if the outer diameter of the pipes P is small, each chuck pawl 13 does not fit the chain line I in FIG.
Since the opening operation is performed by swinging and rotating as shown in Fig. 2, in order to grasp pipes with a small outer diameter as shown in Fig. 2, insert the pipes P near the center O and perform the above-mentioned grasping operation. If the pipes P are inserted far away from the center O, they will fail to be properly gripped. Of course, the opening degree of the chuck pawl can be adjusted by adjusting the reverse rotation speed of the motor M to an appropriate speed, but no matter how careful the operator is in the adjustment, the opening degree will vary.

The present invention prevents the opening degree of the chuck pawl 13 from being too large or uneven, and rotates the protrusion for adjusting the opening degree together with the chuck shaft to accurately stop the chuck pawl at the adjusted opening angle. This is what I did.

An embodiment of the present invention will be described together with details of a conventionally known thread cutting machine.

In the figure, reference numeral 1 indicates a thread cutting machine, on which a die head main body 4 fitted in a pair of guide bars 3 disposed in the longitudinal direction so as to be movable in the axial direction, and a chuck holder 5 are mounted on the machine base 2 with the respective centers O. are provided correspondingly.

This chuck holder 5 has a plurality of (three in this embodiment) chuck shafts 6 as shown in FIG.
are freely rotatably arranged on a virtual circle around the center O at equal angular intervals as described above. For details, see Part 3.
As shown in the figure, the collar 8 of the drum-shaped rotating body 7 is rotatably fitted into the chuck holder 5, which has a hollow interior.
8a supports both ends of each chuck shaft, and a small gear 9 is fixed at an intermediate position of each shaft 6.
is engaged with one internal gear 10, and an external gear 11 carved on the outer periphery of the gear 10,
It meshes with the final gear 12 of the reduction gear system driven by the reversible motor M installed in the machine base 2 as described above.

At both end portions of each chuck shaft 6 protruding from the flanges 8, 8a, chuck pawls 13 having the shape described above are provided.
are fitted as shown in FIG. 3 and fixed with pins 15, and donut-shaped plates 16, 16a forming the outer surfaces of both ends of the chuck holder 5 are fitted onto each chuck shaft 6.

In the illustrated type, each chuck shaft 6 is free to rotate in order to open and close the chuck pawl 13.
Although the rotating drum 7 and the internal gear 10 are shown to revolve together, in the case of a model in which the chuck shaft 6 does not revolve and only the chuck pawl 13 is opened and closed, the rotating drum 7 and the donut-shaped plate 1
6, 16a so as not to rotate.

In this embodiment, in the above-mentioned known configuration, a ring-shaped movable body 21 having a tapered engagement ring 22 corresponding to the outer periphery of all the chuck shafts 6 on the outer periphery of the rotary drum 7 shown in FIG. The movable body 21 is fitted onto the chuck shaft 6 so as to be freely movable in the axial direction, and an annular engagement groove 23 is provided in the movable body 21. Further, a support plate 25 shown in FIGS. 2 and 4 is attached to the side surface of the chuck holder 5 on the stand 24, and the upper edge of the support plate 25 is formed into an arc shape centered on the rotation axis. A plurality of engagement notches 26 are provided in parallel in accordance with various outer diameters of the pipe P,
An outer lever 28 and an inner lever 29 are attached to the rotating shaft 27.
are fixed respectively, and an engagement rod 30 that fits into and engages the engagement groove 23 of the movable body 21 is protruded from the inner lever,
The outer lever is provided with a handle 31 that can be pulled up a little in the direction of the arrow b in FIG. 4, and the handle is provided with a fitting engagement piece 32 that comes off from any of the engagement notches 26 when the lever is pulled up. The structure from the support plate 25 to the engagement piece 32 constitutes an example of the movement control actuation member 33 of the present invention.

A base ring 35 of an abutment piece 34 that abuts against the inclined surface 22a of the tapered engagement ring 22 as the pipe P rotates in the gripping and releasing direction is fitted and fixed to one chuck shaft 6a.

In the above, the abutting piece 34 does not move in the axial direction of the chuck shaft 6a, but the movable body 21 moves the chuck shaft 6 by rotating the handle 31 of the movement control actuation member 33 from the solid line angle to the chain line angle in FIG.
, and stops at any one of several positions corresponding to the engagement notch 26 . For this reason, when the chuck shaft 6a is rotated in the direction of gripping and releasing the pipe P, an abutment piece 34 is formed on the inclined surface 22a on the inner surface of the engagement ring 22, changing the rotation angle as shown in FIG. As a result, the permissible rotation angle in the opening direction of the chuck shaft 6a, the chuck pawl 13a, the internal gear 10, the other chuck shaft 6, and the chuck pawl 13 changes variously, and the abutment piece 34 hits the inclined surface 22a. After the hit, the motor M idles. (A switch for stopping the motor M may be actuated by the shock of the abutment piece 34.) As clarified in the above detailed description, the present invention provides movement control of the moving body 21. By moving the member 33 by an arbitrary amount, the amount of rotation of the chuck shaft 6 in the opening direction can be changed by the angle at which the abutment piece 34 hits the engagement ring 22, and the rotation amount can be adjusted to match the outer diameter of the pipe P to be used. It is possible to stop the chuck at an opening with a little more margin than the outer diameter, and the effect is that the rotational opening in the opening direction generated in the chuck 13 can be accurately controlled by moving the movement control actuating member 33 of the moving body 21 by an arbitrary amount. have.

[Brief explanation of drawings]

Figure 1 is a side view showing the outline of the thread cutting machine, Figure 2
The figure is a partially cutaway front view of the same part, Fig. 3 is a cutaway side view taken along the line A-A in Fig. 2, Fig. 4 is a partially cutaway side view of a part, Fig. 5 is a front view explaining the operation, Fig. 6 is abutment piece 3
4 is a perspective view, and FIG. 7 is a front view illustrating several examples of the angular relationship between the abutment piece 34 and the movable body 21. 4...Die head body, 5...Chuck holder, 6, 6a...Chuck shaft, 10...Internal gear, 13...Chuck pawl, 21...Moving body, 22...Engaging ring, 22a... Slope, 30...
...Engagement rod, 31...Handle, 33...Movement control actuating member, 34...Abutting piece.

Claims (1)

[Scope of utility model registration request] A chuck holder 5 whose center corresponds to the center of the die head body 4 is provided so that the die head body and the chuck holder can be moved relatively close to each other. A plurality of chuck shafts 6 are freely rotatably arranged on a circle at equal angular intervals, and one internal gear 10 reversibly rotates each chuck shaft.
In a screw cutting machine in which a chuck pawl 13 having an eccentric circular arc-shaped chuck surface 14 is tightly fitted to each chuck shaft 6 and sequentially approaches the center as the chuck shaft 6 rotates in one direction, all chuck shafts 6 A movable body 21 provided with a corresponding tapered engagement ring 22 whose inner surface is inclined with respect to the outer periphery of the chuck holder 5 is installed so as to be movable in the axial direction, and the chuck holder 5 is engaged with the movable body 21 to move the movable body 21. A movement control actuating member 33 for controlling the axial movement of the body is provided, and a required chuck shaft 6 is provided.
With the rotational movement of gripping and releasing, the chuck claw 13 collides with the inclined surface of the inner surface of the tapered engagement ring 22.
A chuck for a thread cutting machine, characterized in that an abutment piece 34 is fixed to arbitrarily regulate the rotation angle of the screw.