JPH0340508Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is applicable to cutting of workpieces for sash frames, for example.
The present invention relates to a stopper feeding device for setting a workpiece processing position in a processing machine that performs processing such as drilling or notching.

[Prior Art] When cutting and drilling a long object such as a general sash frame, a processing machine having a stopper for setting the workpiece processing position is used. This processing machine is
The workpiece is positioned by a stopper that is integrated with a nut that is screwed to the feed screw shaft. For example, in Japanese Patent Application Laid-Open No. 58-187642, a trunnion mechanism is used to support the feed nut, and in addition to the rotation mechanism of two orthogonal rotation axes, it has a structure that allows movement in the direction of each of these axes, and a structure that allows movement in the direction of each of these axes is used. A screw feeding device with a self-aligning mechanism is disclosed in which a plurality of balls are disposed between the balls. In order to compensate for the disadvantage of being directly affected by the displacement of the screw shaft, the inner and outer holders are connected to the feed nut using a trunnion mechanism.

In addition, British Patent No. 1477821 does not use a feed nut, but instead provides two screw grooves with a concave cross section on one screw shaft, and a plurality of rollers are installed in each screw groove in the longitudinal direction from two opposing directions. A feeding device is disclosed in which the rolling surface of each roller is rolled against the side surface of each thread.

[Problems that ideas should solve]

However, the former technique of the prior art is a conventional screw-in method of a screw shaft and a feed nut, and in order to eliminate this drawback, it is necessary to use a complicated mechanism.
In the latter case, the entire roller goes into the thread groove, so the thread pitch cannot be made small and it is difficult to achieve feeding accuracy.
In addition, since the roller only contacts the side surface of the thread, all of the feed load is applied to the thread.For strength reasons, the thread has to be made thicker, and this combined with the thread pitch point makes it difficult to increase the feed accuracy, making it difficult to process the thread. It also had the disadvantage of being large in quantity.

[Means to solve the problem]

This invention solves the above problems, provides accurate feeding accuracy with a simple mechanism, allows the feeding wheel to maintain accuracy for a long period of time without causing the screw shaft to wobble, and requires less screw machining. The present invention provides an inexpensive feeding device.

Specifically, in a processing machine that cuts a workpiece, drills a hole, etc., it is rotated forward and backward by a driving means.
A feed screw shaft provided with a thread groove having a V-shaped cross section with an angle of 90 degrees, an inner cylindrical body supporting three or more supports symmetrically along this screw shaft, and both ends of each of the supports. A wheel is provided with an inclined part inclined at 45 degrees toward the screw shaft side, and a wheel is rotatably supported perpendicularly to the inclined part and rolls on opposing threaded surfaces of the threaded groove whose rolling surfaces are separated from each other; Processing consisting of an outer cylindrical body that is arranged parallel to the axis and has a workpiece positioning stopper attached to a part of the outer cylindrical body, and a joint that connects the inner cylindrical body within this outer cylindrical body so as to be rotatably and linearly displaceable. This paper proposes a feeding device for a machine stopper. In this case, the joint may be a pin, or may be a combination of a universal joint and a pin.

〔Example〕

Examples of this invention will be described below based on the drawings.

1 to 3 show a front view, a plan view, and a side view of a work positioning processing machine having a feeding device of this invention, in which a processing machine 1 carries a workpiece (not shown) fed in from the direction of arrow A. On the machine base 2 to be placed,
A pair of guide rails 3, 3 and a feeding screw shaft 4,
It has a structure in which workpiece positioning stoppers 6, 6 are attached to feed mechanisms 5, 5, respectively. In this case, the four feed screw shafts are rotatably installed on opposite sides of the guide rails 3, 3 with bearings 7, 7, and are connected to one end of the four shafts via a shaft coupling 8 for forward and reverse rotation. A motor 9, which is a possible drive means, is connected.

As shown in FIGS. 4 to 6, the feeding mechanism 5 has a screw groove 1 having a V-shaped cross section on the feeding screw shaft 4.
A wheel 11 that moves in the axial direction of the screw shaft 4 while engaging with the screw shaft 4, an inner cylinder 12 that meets the support body 15 and supports the wheel 11 inwardly, and guide rails 16, 16... an outer cylindrical body 13 which is slidably supported by the guide rail 3 via the outer cylindrical body 13 and has the stopper 6 attached to a part thereof;
3 and a joint 14 that connects the inner cylinder 12 so as to be rotatably and linearly displaceable.

In this case, the screw groove 10 of the feed screw shaft 4 has a thread angle of 90 mm as shown in FIG. 7a or b.
Triangular or trapezoidal threads are used. As shown in FIGS. 5 and 6, four supports 15 are installed symmetrically inside the inner cylindrical body 12, and at both ends thereof there are inclined portions 15a inclined at 45 degrees toward the screw shaft 4.
15a are provided, and wheels 11, 11 are pivotally supported at right angles to these inclined portions 15a. The rolling surfaces 11a, 11a of the wheels 11 roll on the threaded surfaces 10a, 10a in the threaded grooves 10, which face each other and are separated from each other.

Further, as shown in FIGS. 6 and 8, the joint 14 is slidable between a small-diameter shaft portion 14a that rotatably supports the inner cylinder 10 and a mounting hole 13a provided in the outer cylinder 13. The large diameter shaft portion 14b fits into the stepped pin.

In the feeding device constructed as described above, when moving the workpiece positioning stopper 6 to a predetermined setting position, the feeding screw shaft is moved by driving the motor 9 in either the forward or reverse direction. 4 rotates and each wheel 11 rolls on each threaded surface 10a.
moves along the thread groove 10, and the wheel 11
The inner cylindrical body 12 that supports the group via the support 15 moves, and the inner cylindrical body 12 is levered with the stepped pin 14.
Outer cylinder body 1 attached so as to be rotatably and linearly displaceable.
3 moves along the guide rail 3, and the stopper 6 is sent to a predetermined position.

As shown in FIG. 9, even if the feed screw shaft 4 is bent or bent for some reason, the stepped pin 14 allows the inner cylindrical body 12 and each wheel 11 to be connected to the outer cylindrical body. 13 and the stopper 6, it can be freely displaced horizontally and vertically.
Each wheel 11 can follow the deformation of the screw shaft 4, and the stopper 6 can be smoothly fed, and the load torque of the motor 9 can be reduced.

In the above embodiment, the number of supports 15 is four symmetrically provided, but it is clear that the number of supports 15 is not limited to this, and at least three symmetrically provided supports are sufficient.

Further, the joint does not necessarily have to be a stepped pin 14, but may be a pin of the same diameter, or it can be connected to the mounting hole 13 of the outer cylindrical body 13 as shown in FIG.
It is also possible to use a joint 14e composed of a pin 14c and a universal joint 14d that are slidably fitted into the joint 14a.

[Effect of idea]

According to this invention as described above, the following unique effects can be achieved.

(1) The screw pitch of the feed screw shaft can be made smaller, and only the rolling surfaces of each wheel roll in different directions within the thread groove with a V-shaped cross section, achieving highly accurate feed regardless of the wheel diameter. can.

(2) Since the entire feed screw shaft can receive the feed load, and each wheel hits the screw shaft from a different direction in the axial direction, the screw shaft is difficult to shake and does not reduce the feed accuracy.

(3) Even if the feed screw shaft is bent, bent, warped, etc., each wheel and the inner cylinder can follow the screw shaft, and the stopper attached to the outer cylinder can be fed smoothly and accurately. It is positioned at the set position.

(4) Since a large torque is not required to rotate the feed screw shaft, the load torque of a drive means such as a motor can be reduced.

(5) The amount of thread machining required for the thread groove of the feed screw shaft is also small, making it possible to simplify the entire mechanism and provide an inexpensive feed device that combines the effects of (4) above.

[Brief explanation of the drawing]

1 to 3 are a front view, a top view, and a side view of a processing machine having a feeding device of this invention, respectively;
Fig. 4 is a perspective view showing an embodiment of the feeding device, Figs. 5 and 6 are sectional views of main parts of the feeding device and its side views, and Fig. 7 a and b are thread grooves of the feeding screw shaft, respectively. 8 is a sectional view showing how the joint is attached, FIG. 9 is a schematic front view showing how the wheel and inner cylinder follow each other, and FIG. 10 is a sectional view showing how other joints are attached. It is a diagram. 3... Guide rail, 4... Feed screw shaft, 5
...Feeding mechanism, 6...Work positioning stopper,
9... Drive means (motor), 10... Thread groove, 1
0a...Threaded surface, 11...Wheel, 12...Inner cylinder, 13...Outer cylinder, 13a...Mounting hole, 1
4...Joint pin, 14a...Small diameter shaft portion, 14b...
...Large and small diameter shaft portion, 14c...Pin, 14d...Universal joint, 14e...Joint, 15...Support, 15a
... Inclined portion, 16... Guide roller.

Claims (1)

[Claims for Utility Model Registration] 1. A feed screw provided with a thread groove having a V-shaped cross section and having a 90 degree angle, which is rotated in forward and reverse directions by a driving means in a processing machine that cuts, holes, etc. in a workpiece. a shaft, an inner cylindrical body supporting three or more supports symmetrically along the screw shaft, and sloped portions inclined at 45 degrees toward the screw shaft at both ends of each of the supports; a wheel that is supported perpendicularly to the wheel and rolls on opposing threaded surfaces of the threaded groove with rolling surfaces spaced apart from each other, and a stopper that is arranged parallel to the threaded shaft and is attached to a part of the wheel for positioning the workpiece. 1. A feeding device for a stopper for a processing machine, comprising an outer cylindrical body and a joint that connects the inner cylindrical body to the outer cylindrical body so as to be rotatable and linearly displaceable. 2. A feeding device for a stopper for a processing machine according to claim 1, wherein the movable joint is a pin. 3. The stopper feeding device for a processing machine according to claim 1, wherein the joint is comprised of a universal joint that controls rotational displacement and a pin that controls linear displacement.