JPS61244454A - Spiral groove forming device - Google Patents

Abstract

PURPOSE:To make it possible to form a spiral groove having a uniform width in the outer peripheral surface of a columnar glass, by operating a shifting device at a position where the peripheral speed of a second disc decreases to press a cutter against a glass material, etc. with a soft touch. CONSTITUTION:A cam 41 is rotated by a drive shaft 33, and a cap 38 on a glass 37 is gripped by a gripping device 40. Meanwhile a second disc 12 is rotated in association with the rotation of a first disc 5, and associatingly, the drive cam 14 is rotated. In this arrangement a rotary shaft supporting the second disc 12 is shifted with respect to a rotary shaft supporting the first disc 5 so that the second disc may rotate over an angle of 360 deg. per one cycle, and further, its peripheral speed may be decreased at a predetermined position for a predetermined time. Accordingly, levers 47, 49 are rotated at this position by means of a wire rope 49 to lower and press a cutter 45 against the glass 37 with a soft touch. Thus, it is possible to form a spiral groove with a uniform width and depth.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a spiral groove forming device for forming spiral grooves on the outer periphery of a cylindrical insulator constituting a fixed film resistor, for example.

Conventional technology Conventionally, in order to form a spiral groove on the outer periphery of a cylindrical insulator constituting a fixed film resistor, a cap fitted to both ends of the cylindrical insulator is gripped by a gripping device, and the cap is held in this gripped state. and moving the insulator in one direction while rotating it. During this time, a disk-shaped spiral groove forming cutter is lowered and brought into contact with the insulator, thereby forming a spiral groove on the outer periphery of the insulator. The cutter is then lowered intermittently by a cam. At this time, it is known that the width and depth of the spiral groove can be formed uniformly by slowing the descent speed slightly just before the cutter contacts the insulator to obtain a so-called soft touch state. For this reason, the shape of the cam is designed in advance so as to realize soft-touch lowering of the cutter.

Problems to be Solved by the Invention However, the cam in the above-mentioned prior art is fixed on the drive shaft. Therefore, if the cam lowers the cutter at a faster rate than it is designed for, the soft-touch lowering will be lost.

The cutter comes into impactful contact with the insulator, and the groove tends to be particularly wide and deep at the starting position of the groove forming operation.
Due to the resistance characteristics, this is not only undesirable, but also cannot be used when there are a large number of grooves.If only a single cam is used as in the past, due to its design, the maximum capacity is 130 to 140 waves per minute. The limit is the processing of individual pieces. In addition, if the cam is designed to obtain a soft touch descent at high speeds, if this cam is used for low speed machining, the depth of the groove will trail at the beginning of the cut, which is undesirable due to the resistance characteristics. .

Therefore, the present invention makes it possible to obtain a soft touch descent of the cutter against the insulator, etc., not only during low-speed rotation but also during high-speed rotation, by a simple operation, and to form a spiral groove of uniform width and depth. It is an object of the present invention to provide a spiral groove forming device that is capable of forming spiral grooves.

Means for solving the problems and the technical means of the present invention for solving the above-mentioned problems include a first rotating shaft, a first rotating shaft mounted on the first rotating shaft, and a groove formed in the diametrical direction. a second disc mounted on the second rotating shaft; rotatably supported by the second disc at an eccentric position;
A driven wheel inserted into the groove of the first disc, a driving cam mounted on the second rotating shaft, and a driving cam that connects the first rotating shaft and the second rotating shaft so that their axes are aligned with each other. a moving means for relatively moving so as to be able to shift; a power transmission means linked to a moving device for the driving cam and the spiral groove forming cutter; and a driving device for rotating the first rotating shaft. It is equipped with the following.

action The effects of the technical means of the present invention described above are as follows.

The first rotating shaft and the first disk are rotated by the driving device. As the first disc rotates, the second disc rotates via the groove and the driven wheel. Along with the rotation of this second disk,
A driving cam rotates via the second rotating shaft. By shifting the axis of the second rotating shaft supporting the second disk with respect to the first rotating shaft supporting the first disk, the second disk rotates 360 degrees. At a certain position, the circumferential speed can be slowed down for a certain period of time. Therefore, at the position where the circumferential speed is slowed down, the moving device is actuated via the power transmission means, thereby lowering the cutter with a soft touch against the insulator, etc. It can be pressed in any condition.

EXAMPLE Hereinafter, an example of the present invention will be described in detail with reference to the drawings. As is clear from FIGS. 1 to 4, particularly FIGS. 3 and 4, a bearing 2 is mounted on a substrate 1, and a first rotating shaft 3 is supported by this bearing 2. A boot 9-4 and a first disk 5 are sequentially mounted on the first rotating shaft 3 toward the end side. A groove 6 is formed in the first disk 5 in the diametrical direction. A movable plate 7 is supported on the substrate 1 by a support frame 8 so as to be movable in a direction perpendicular to the first rotating shaft 3 .

A bearing 10 is attached to the upper surface of one side of the movable plate 7, and a second rotating shaft 11 is supported by the bearing 10. A second disc 12 is attached to the end of the second rotating shaft 11 on the side of the first disc 5, and a driven wheel 13 is rotatably supported at an eccentric position of the second disc 12. , this driven wheel 1
3 is inserted into the groove 6 of the first disc 5. A driving cam 14 is mounted on the second rotating shaft 11 between the bearing 10 and the second disk 12. A support frame 8 is attached to the substrate 1.
A support member 15 is mounted on the side, and this support member 1
A screw shaft 16 is rotatably supported on the screw shaft 1.
6 is the collar 1 attached to the collar 17 and the screw shaft 16.
8 sandwich the support member 15 and prevent it from moving in the axial direction. A threaded portion 20 formed on the distal end side of this threaded shaft 16 is screwed into the movable plate 7. Therefore, screw shaft 1
By rotating the movable plate 6 in either direction using the knob 21, the movable plate 7 can be moved forward or backward. At the same time, the bearing 10, the second rotating shaft 11, the driving cam 14, the second disc 12, etc. are moved to align the axis of the second rotating shaft 11 with the axis of the first rotating shaft 3. It can be made to move or move.

A shaft 23 is rotatably supported by a bush 24 on the upwardly projecting portion 22 of the bearing 10, and bifurcated base portions of levers 25 and 26 are attached to both projecting ends of the shaft 23 by screw shafts 27. On the other hand, a cam follower 28 is rotatably supported at the lower end of the lever 25. This lever 25
Spring hooks 30 and 31 are provided protruding from the intermediate portion of the bearing 10 and the bearing lO, and a tension spring 32 is tensioned on these spring hooks 30 and 31. The elasticity of the tension spring 32 urges the cam follower 28 to come into contact with the outer peripheral surface of the drive cam 14. As the drive cam 14 rotates, the levers 25 and 26 swing together via the cam follower 28.

A drive shaft 33 for rotating the first rotation shaft 3 is rotatably supported by a bearing 34 on the base l. A pulley 35 is installed on the drive shaft 33, and this pulley 3
A belt 36 is hung between the pulley 5 and the pulley 4.

By rotating the drive shaft 33 by driving a motor (not shown), the first rotating shaft 3 can be rotated via the pulley 35, belt 36, and pulley 4.

As shown in FIGS. 1 and 2, caps 38 are fitted to both ends of the insulator 37, and these caps 38 are gripped from both sides by a pair of gripping devices 40. A cam 41 is attached to the drive shaft 33. On the other hand, the intermediate portions of a pair of levers 43 are swingably supported on the machine frame 42, and one end of each lever 43 is linked to each gripping device 40.
A cam follower 44 is rotatably supported at the other end. This cam follower 44 is in contact with the cam 41. When the cam 41 rotates with the rotation of the drive shaft 33, the gripping device 40 first grips the cap 38 of the insulator 37 via the cam follower 44 and the lever 43 and moves to the left in FIG. After that, the cap 38 is released, and the disk-shaped spiral groove forming cutter 45, which can return to the right after the release, is driven by a moving device including a lever mechanism 46, and levers 47 and 48. When the cutter 45 rotates upward, the cutter 45 descends and is pressed against the insulator 37 held by the gripping device 40. This lever 47 is connected to the lever 26 by a connecting cable 49 which is a power transmission member. That is, one end of the connecting cable 49 is inserted through the lever 47 and fixed with a screw 50, and the other end of the connecting cable 49 is inserted into a hole in a holding member 51 attached to the lower end of the lever 26 and fixed with a screw 52. (see FIGS. 1 and 2), therefore, as described above, the rotation of the drive cam 14 causes the cam followers 25 and 26 to swing, thereby rotating the levers 47 and 48 via the connecting cable 49. be able to.

Next, the operation of the above embodiment will be explained. When the drive shaft 33 rotates, the cam 41 also rotates, and the gripping device 4
0 starts gripping the cap 38. On the other hand, the first rotating shaft 3 and the first disc 5 rotate via the pulley 35, belt 36, and pulley 4. As the first disc 5 rotates, the second disc 12 rotates via the groove 6 and the driven wheel 13. As the second disk 12 rotates, the drive cam 14 rotates via the second rotating shaft 11. For example, as shown in FIGS. 1 and 2, the second disk 1
Assuming that the second rotating shaft 11 supporting the disk 2 is offset to the driven wheel 13 with respect to the first rotating shaft 3 supporting the first disc 5, as shown in FIGS. 5 and 6, Second disk 12
The circumferential speed becomes faster on the 0 degree side and becomes slower near 180 degrees. This operation is repeated every 360 degrees, so around 180 degrees where the circumferential speed becomes slow, the cam follower 28
, lever 47 via levers 25, 26 and connecting cable 49.
．． 48 can be rotated to press the cutter 45 against the insulator 37 in a soft touch downward state. On the contrary, by operating the screw shaft 16, the movable base 7 and the bearing lO are moved, and the second rotating shaft 11 that supports the second disc 12 is rotated to the first rotation that supports the first disc 5. Driven wheel 13 relative to shaft 3
When the second disk 12 is shifted to the opposite side, the second disk 12
In the figure, the position where the peripheral speed is slow at 180 degrees is 0 degrees,
Therefore, at around 0 degrees where this circumferential speed becomes slow, the cam follower 28. Via the lever 25,26 and the connecting cable 49, the lever 47,48 can be rotated to press the cutter 45 against the insulator 37 in a soft-touch lowered state.

When the drive shaft 33 is rotated at high speed, the cycle shown in FIG. 6 is shortened, and the time around 180 degrees or 0 degrees, where the circumferential speed is slow, is shortened, and the descending speed of the cutter 45 becomes faster. . Here, by shifting the second rotating shaft 11 so as to approach the first rotating shaft 3,
Since the portion where the circumferential speed is slow at 0 degrees or around 0 degrees is not shortened, the pressure of the cutter 45 against the insulator 37 in the soft touch descending state can be maintained.

As a result of the test according to this example, it was possible to form 200 to 250 grooves per minute in a soft touch state in good condition by performing high-speed driving.

Note that it is also possible to move the first rotating shaft 3 and the first disc 5 side.

Effects of the Invention As is clear from the above explanation, according to the present invention, a first disk having a groove formed in the diametrical direction and a driven wheel inserted into the groove of the first disk are provided at an eccentric position. the second disc, the first disc
A portion of the second disk having a low circumferential speed can be set by a simple operation of moving the second rotation axis relative to the second rotation axis so as to deviate from the second rotation axis. Therefore, in this slow part, the drive cam operates the moving device of the spiral groove forming cutter, and the lowering speed of the cutter is always set to be slow even during high-speed driving, so that a soft touch lowering state against the insulator etc. can be obtained, and the spiral groove is The width and depth of the groove can be formed uniformly.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the spiral groove forming device of the present invention, in which FIG. 1 is an overall schematic side view, FIG. 2 is an overall schematic front view, and FIG. 3 is an enlarged side view of main parts. , Fig. 4 is an enlarged plan view of the main parts, Fig. 5 is an explanatory diagram of the relationship between the first disc, the second disc, and the driving cam, and Fig. 6 is an explanatory diagram of the circumferential velocity of the second disc. It is. 3... First rotating shaft, 5... First disc, 6...
Groove 7...Movable plate, 11...Second rotating shaft, 12...
- Second disk, 13... Driven wheel, 14... Drive cam, 16... Screw shaft, 25.26... Lever, 28
...Cam follower, 33...Drive shaft, 37...
Insulator, 38... Cap, 40... Gripping device, 41
...Cam, 45...Cutter, 49...Connection cable.

Claims (1)

[Claims] a first rotating shaft; mounted on the first rotating shaft;
a first disc having a groove formed in the diametrical direction; a second rotating shaft; and a second disc mounted on the second rotating shaft;
a driven wheel rotatably supported by the second disc at an eccentric position and inserted into a groove of the first disc; a driving cam mounted on the second rotating shaft; a moving means for relatively moving the first rotating shaft and the second rotating shaft so that their axes can be shifted from each other; and a moving device connected to the driving cam and the spiral groove forming cutter. A spiral groove forming device comprising a power transmission means and a drive device for rotating the first rotating shaft.