JPH0115727B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a distance setting method for automatically adjusting the distance between a rotating shaft and a receiving plate.

[Technical background of the invention and its problems]

Today, with the advancement of factory automation, production lines that used to rely on manual labor are increasingly being replaced by robots. The mainstream of this FA is assembly lines, but there is also a growing demand for FA for adjustment lines that also require judgment functions.

For example, there is a demand for labor saving and mass production.
Regarding the VTR line, it is related to video, so
In particular, high reliability, high speed, and low cost are required.

In a VTR line, for example, it has been proposed that the adjustment between the tip of the capstan shaft and the receiving plate at the tip be performed using a device disclosed in Japanese Utility Model Application No. 59-42318.

However, even with this proposal, since the height of the adjustment plate is selected at a very small distance, it cannot be immediately applied to a VTR that requires an accuracy of 1/10 mm.

If this distance 〓 is too large, the capstan roller for feeding the magnetic tape will move greatly in the axial direction, which may cause bending deformation to the magnetic tape, causing wow and flutter. In addition, if there is not enough time, a large torque will be applied due to contact resistance at the tip of the rotating shaft of the capstan roller, and the capstan roller will not be able to rotate smoothly.

[Purpose of the invention]

This invention was made in response to the above points,
The purpose of the present invention is to provide a time setting method that allows automatic adjustment of minute distances and also allows easy setting of desired distances.

[Summary of the invention]

That is, this invention bends the receiving plate at the tip of the rotating shaft by a predetermined amount by rotating an adjustment screw, and then reversely rotates the adjusting screw by a predetermined amount to curve the tip of the adjusting screw provided on the receiving plate. This provides a method for setting the distance between the tip and the tip of the rotating shaft.

[Embodiments of the invention]

Next, an embodiment in which the method of the present invention is applied to the adjustment between the tip of the capstan roller and the receiving plate of a VTR will be described with reference to the drawings. That is, the backlash between the tip of the capstan roller and the adjustment member in the thrust direction can be set to a constant value.

A hardened capstan roller 3 having a diameter of, for example, 2 mm is provided, passing through the chassis 1 of the VTR via a bearing 2. ) via a belt 5.
The tip 6 of the capstan roller 3 protrudes further from the upper end side of the flywheel 4.
That is, this capstan roller 3 is a belt drive mechanism. A receiving plate 7 of the capstan roller 3 is provided below (upper in the figure) the tip 6 of the roller 3. This receiving plate 7 is the roller 3
This 20 mm wide strip iron plate forms a "U-shape" and is fixed to the chassis 1, as if the flywheel 4 were installed therein. An adjustment screw 8 is provided on the extension of the tip 6 of the capstan roller 3 of the receiving plate 7, and the adjustment screw 8 is rotated to adjust the distance between the tip 6 and the tip 9 of the adjustment screw 8.
is set to a predetermined value, for example, 0.1 mm to 0.25 mm.
This adjustment screw 8 is made of Teflon, for example, and has a radial pitch of, for example, 0.5 mm and a diameter of 4 mm. A cap 2a is provided on the upper part of the bearing 2, and a magnetic tape (not shown) is provided to slide between the cap 2a and the other end of the capstan roller 3. This magnetic tape is driven between pinch rollers (not shown) that are in pressure contact with the capstan roller 3.

In such an operating system of the capstan roller 3, the tip 6 of the capstan roller 3 and the adjustment screw 8
The interval 〓 between the tips 9 of is set as follows.

That is, a driver is inserted into the rotation groove 8a of the adjustment screw 8 and rotated in one direction (clockwise rotation), for example, in the direction in which the receiving plate 7 is curved, that is, in the insertion direction. When the screw 8 is rotated clockwise, the tip 9 of the screw 8 comes into contact with the tip 6 of the capstan roller 3. When the receiving plate 7 is further rotated clockwise, since both ends of the receiving plate 7 are fixed to the chassis 1, the receiving plate 7 curves upward about the screw 8. The size of this curvature is detected by a sensor and set to a predetermined size, for example 0.005 to 0.05 mm (setting is free).
Curve it to a height of . After raising it to this predetermined height, the screw 8 is rotated reversely from that position by a predetermined number of rotations. That is, measure the position where the receiving plate 7 is curved to a predetermined size, calculate the distance from this height to the position of the tip 6 of the capstan roller 3, and calculate the reverse rotation speed of the screw 8 during that time. If you calculate this and rotate it backwards, for example four times, you can set the distance correctly. Such setting operations can be performed reliably and accurately in automation.

This is because there is only linear movement in the direction of the rotation axis. This automatic adjustment can be operated, for example, according to FIGS. 2 and 3. An example of an automatic adjustment device will be specifically described below with reference to FIG.

FIG. 2 is a side view of the device, partially in section.

In order to insert a tool 10 (driver) having substantially the same shape as the groove 8a into the groove 8a of the adjustment screw 8, it is lowered by an air cylinder 11. The tool 10 does not fit into the groove 8a of the adjustment screw 8, and the tool 10 does not fit into the head of the adjustment screw 8.
Once they are in contact, the tool 10 can be rotated to allow insertion. These programs can be easily executed by storing them in advance. The inserted tool 10 is fixed to a tool holder 12. When the tool holder 12 is provided with cushioning properties, a spring 13 is externally connected to the tool holder 12 in order to apply a constant pressure to the adjusting screw 8 at the same time. A rotation stopper pin 15 is driven into the tool holder 12 to prevent the tool holder 12 from rotating.
The rotation stopper pin 15 is connected to the slit portion 1 of the shaft 14.
4a. Shaft 14 is bearing 1
6, and is connected to a stepping motor 18 via a coupling 17. Therefore, the tool 10 rotated by the power of the stepping motor 18 transmits a stable rotational movement to the adjusting screw 8.

A bracket 19 of the stepping motor 18 is attached to a linear bearing 20 and can be moved up and down. 2
1 is a main bracket that fixes a linear bearing 20, and serves as the pillar of this device. Attach the air cylinder 11 to this main bracket 21 and connect the drive rod 1.
An L-shaped plate 22 is fixed to the bracket 19 via a floating joint 11b at the tip of 1a,
The linear bearing 20 moves up and down without difficulty. A block 23 having a hole into which the bearing 16 can be inserted is attached to the bracket 19, and an L-shaped block 25 to which a detection linear bearing 24 is fixed is attached to the block 23.
is fixed. The detection linear bearing 24 is connected to a measuring plate 27 equipped with a pair of measuring elements 26, for example, through a bearing 28, which allows the measuring plate 27 to move up and down, and the measuring plate 27 becomes a mechanism that moves in the direction of arrow C with the bearing 28 as a fulcrum. . Therefore, the measuring plate 27 is lowered by the cylinder 11, and the measuring element 26 of the measuring plate 27 comes into contact with the upper surface of the receiving plate 6 and becomes stable. After the measuring element 26 contacts the upper surface of the receiving plate, the tool 10 is rotated and the adjustment screw 8 is rotated. When the adjusting screw 8 rotates and the tip 9 of the screw 8 hits the tip 6 of the capstan shaft 3 and further rotates, the receiving plate 7 curves. That is, since the side portions of the receiving plate 7 are fixed, the vicinity of the adjustment screw 8 curves upward. This bending action causes the probe 26a to move toward the bearing 2.
A switch 31 is turned on to detect a displacement on the micron order of the end face 30a of the L-shaped block 30, which rotates about 9 as a fulcrum and is equipped with a measuring tip 26a, and detects the amount of curvature. This switch 31 is set to turn on when a predetermined amount of curvature is reached. At the same time as this switch 31 is turned on, the rotation of the tool 10 is stopped. Based on the detection signal of the amount of curvature, the tool 10
is reversed until the specified gap is reached. That is, the tool 10 is rotated at a preprogrammed rotation speed in the reverse direction. Therefore, the adjustment screw 8 and the capstan shaft can always have a constant clearance. The process of applying the thread locking agent to the adjustment screw 8 adjusted in this way will be explained below.

FIG. 3A is a left side view of FIG. 2, partially in section, and the same parts as in FIG. 2 are designated by the same numbers.

A certain amount of thread locking agent passes through the tube 32, passes through the hole 33a of the shaft 33, and is constantly replenished to the nozzle 34. The nozzle is removably integrated with a shaft 33, and the shaft 35 has a thrust bearing 3 inserted into a hole in the block 23.
5 allows for smooth vertical movement. 3
6 is the rotation stopper shaft of the nozzle 34 and the plate 3
It is connected to 7.

Therefore, the nozzle 34 is lowered by the cylinder 35 until it comes into contact with the threaded portion of the adjusting screw 8. As it descends, a certain amount of thread locking agent is discharged and applied to the adjustment screw part, and it is fixed.

〔Effect of the invention〕

As explained above, the method of the present invention has the effect of accurately setting the distance between the tip of the rotating shaft and the tip of the adjustment screw.

This is a setting operation that is particularly easy to automate.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining an embodiment of the method of the present invention, Fig. 2 is an explanatory diagram of an embodiment of the setting device between Fig. 1, Fig. 3A is a side view of Fig. 2, Fig. 3B is the second
FIG. 6 is a diagram illustrating the position fixing means after setting. 3...Capstan roller, 4...Flywheel, 7...Socket plate, 8...Adjustment screw, 6,9...
tip.

Claims (1)

[Scope of Claims] 1. Between the receiving plate which is rotatably provided through the substrate and has a function of stopping the axial movement of the rotating shaft tip, and the rotating shaft tip, the rotating shaft of the receiving plate is connected. In the method of setting using an adjustment screw provided at an extended position of the tip, means for rotating the adjustment screw in a first direction to curve the receiving plate by a predetermined amount, and a position at which the receiving plate is curved by this means. and means for rotating the adjusting screw in a second direction at a predetermined number of rotations, and setting the distance between the tip of the adjusting screw and the tip of the rotating shaft. 2. The setting method according to claim 1, wherein the rotating shaft is a capstan shaft of a tape recorder.