JPS61197814A - Method of setting gap - Google Patents

Abstract

PURPOSE:To automatically adjust a fine gap while set a desired gap with ease by reversely rotating an adjusting screw by a predetermined amount and for thereby setting the gap between the tip end of the adjusting screw provided on a support plate and the tip end of a rotary shaft. CONSTITUTION:A support plate 7 for a capstan roller 3 is provided downwardly the tip end 6 of the roller 3. The support plate 7 is U-shaped more widely than the diameter of the roller 3, and fixedly mounted on a chassis 1. An adjusting screw 8 is provided on the extension part of the tip end 6 of the capstan roller 3 on the support plate 7, and a gap formed between the tip end 6 and the tip end of the adjusting screw 8 is set to a set value by the operation of the adjusting screw 8. With such arrangement, automatic adjustment of the gap can be assured to permit a desired gap to be set with ease.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] > M fi +110 1! 1m bird j
m M g g L M p+interest R'
h 4 6 6++ ^h Ir 1141'A Nowadays, production lines that used to rely on one person are being actively replaced with robots. The main stream of this FA is the assembly line, but FA for the adjustment line also requires a judgment function.
Increasingly, K is also requested.

For example, VTR lines require labor-saving and mass production, and as they involve video, they require particularly high reliability and
High speed and low cost are required.

In a VTR line, for example, the gap between the tip of the capstan shaft and the receiving plate of this tip can be adjusted using
The device disclosed in No. 42318 has been proposed.

However, even with this proposal, since the height dimension of the adjustment plate is selected at a constant value, an accuracy of 1/10 is required for the VT.
It cannot be applied immediately as R.

If this gap is too large, the capstan roller that feeds the magnetic tape will move greatly in the axial direction, potentially causing bending deformation to the magnetic tape.
It can also cause damage. Furthermore, if there is no gap, a large torque will be applied due to the contact resistance at the tip of the rotating shaft of the capstan roller, and the capstan roller will not rotate smoothly.

[Purpose of the invention]

This invention was made in response to the above points.

To provide a gap setting method that allows automatic adjustment of minute gaps and also allows easy setting of a desired gap.

[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 gap between the rotary shaft 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 adjusting the gap between the tip of a capstan roller and a receiving plate of a VTR will be described with reference to the drawings. That is, the backlash in the thrust direction between the tip of the capstan roller and the adjustment member can be set to a constant value.

A hardened capstan roller (3) with a diameter of, for example, two fins is provided, passing through the shear 7 (1) of the VTR via a bearing (2), and this capstan roller (3) is a flywheel fixed in the chassis (]). The flywheel (4) is rotatably driven by a motor (not shown) via a belt (5).The tip (6) of the capstan roller (3) is further located on the upper end side of the flywheel (4). ) protrudes. That is, this capstan roller (31 is a belt drive mechanism. Below (in the figure, above) the tip (6) of the roller (3) is a receiving plate of the capstan roller (3). (7)
is provided. This receiving plate (force is greater than the diameter of the roller (31), for example, 201 m, this 20111
A strip-shaped iron plate with the same width as the flywheel (4) forms a "U-shape" and is fixed to the chassis (]).

An adjustment screw (8) is provided on the extension of the tip (6) of the capstan roller (3) of this receiving plate (7), and by rotating the adjustment screw (8), the tip (6) and the adjustment screw ( The gap between the tips (9) of 8) is set to a predetermined value, for example, 0.1111 to 0.2511.

This adjustment screw (8) is made of Teflon, for example, and has a radial pitch of, for example, Q, 5111. The diameter is 40. The above bearing (
2) is provided with a cap (2a), 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 a capstan roller (3).

In such an operation system of the capstan roller (3), the tip (6) of the capstan roller (3) and the adjustment screw (8)
) The gap between the tips (9) is set as follows.

That is, a driver is inserted into the rotation groove (8a) of the adjustment screw (8) and rotated (clockwise) in one direction, for example, in the direction in which the receiving plate (7) curves, 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 it is further rotated clockwise, both ends of the receiving plate (7) are fixed to the chassis (1).

The receiving plate (7) curves upward about the screw (8). The magnitude of this curvature is detected by a senna, and the curve is made to a predetermined height, for example, o, oos to 0,05 dragon (setting is free). After raising it to this predetermined height, the screw (8) is rotated reversely from that position by a predetermined number of rotations. In other words, measure the position of the receiving plate (where the force is curved to a predetermined amount), and then move the capstan roller (3
) to the position of the tip (6), calculate the number of reverse rotations of the screw (8) that will form the gap, and then perform ``reverse rotation, for example, 4 rotations, to set the gap correctly. This type of table gap setting operation can be executed easily 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 tll (driver) having almost the same shape as the groove (8a) into the groove (8a) of the adjustment screw (8), it is lowered by an air cylinder Uυ. The tool (8a) does not fit into the groove (8a) of the adjustment screw (8),
Once 1G makes contact, insertion is possible by rotating tool tlI. These programs can be easily executed by storing them in advance. The inserted tool (
It is fixed on the tool holder. A spring αJ is circumscribed on the tool holder α in order to simultaneously apply a constant pressure to the adjustment screw (8) when the tool holder (13 is exposed to the bushing).
Drive the rotation stop pin a9 into the tool holder a7J as a rotation stopper, and the rotation stop pin α9 is attached to the shaft (14c
) is brought into contact with the slit part (14).The shaft α groove is rotatable by the bearing (1119) and is connected to the stepping motor (18) via the coupling η.Therefore, it is rotated by the power of the stepping motor α barrel. The tool (11) transmits a stable rotational movement to the adjustment screw (8).

The stepping motor (2) bracket, USJ, is attached to the linear bearing (to) and can be moved up and down. The ring is the main bracket that fixes the linear bearing (A) and is the pillar of this device. Attach the air cylinder cL1) to this main bracket, fix the L-shaped plate C1 to the tip of the drive rod (11!L) through the 70-tengu blind India (11b), and fix the L-shaped plate C1 to the bracket α scratch. can be moved up and down without difficulty. Attach the block (to) that has a friend that makes it possible to insert the bearing tilt into the bracket α,
An L-shaped block (C) that fixes the detection linear bearing (3) is fixed to the block (C). Detection linear bearing (2) is 9
For example, a measuring plate (2) equipped with a pair of measuring probes (2) can be moved up and down and connected to K (2) via a bearing (2) as a fulcrum, forming a mechanism in which the measuring plate (2) moves in the direction of arrow C. Therefore, the measuring grate (5) is lowered by the cylinder a1), and the measuring plate of the measuring plate comes into contact with the upper surface of the receiving plate (6) and becomes stable.

After the probe (■) comes into contact with the top surface of the receiving plate, rotate the tool (II) and rotate the adjustment screw (8).The adjustment screw (8) rotates and the tip (9) of this screw (8) touches the capstan. When it hits the tip (6) of the shaft (3) and rotates further, the receiving plate (7) curves.In other words, since the side of the receiving plate (7) is fixed, the area near the adjustment screw (8) bends. Curve upward.

Due to this bending movement, the measuring element (26a) rotates around the bearing (to) as a fulcrum, and the end of the L-shaped block (towards) equipped with the measuring element (26) is activated by a switch 0η that detects displacement on the order of 100 kHz. is on ■! The amount of curvature is detected. This switch λ switch 01) is set to turn on when a predetermined amount of curvature is reached. At the same time as this switch 0υ is turned on, the rotation of the tool is stopped. Based on the detection signal of the amount of curvature, the tool α is reversed until it reaches a predetermined clearance. That is, the tool handle is rotated in the opposite direction at a preprogrammed rotation speed. Therefore, the adjustment screw (8) and the capstan shaft can always have a constant clearance. Below is Ki! Liii! The part where the thread locking agent is applied to the adjusted adjustment screw (8) will be explained.

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

A certain amount of thread locking agent is passed through the tube 02 to the shaft (
It passes through the hole (33a) of the nozzle 04) and is constantly replenished. The nozzle C3-1) is a detachable VC unit with the shaft (to), and the shaft (to) is a thrust bearing (to) inserted into the hole in the block (to).
This allows for smooth vertical movement. (to) is the nozzle's rotation prevention shaft and is connected to (gray) on.

Therefore, the nozzle (B) is lowered by the cylinder (C) until it comes into contact with the threaded portion of the adjustment screw (8). When descending, a certain amount of thread locking agent is discharged and applied to the vj4m threaded part, and it is fixed.

〔Effect of the invention〕

As explained above, according to the method of the present invention, it is possible to accurately set the gap 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 the drawing]

FIG. 1 is a diagram for explaining an embodiment of the method of the present invention, and FIG.
The figure is an explanatory diagram of an embodiment of the gap setting device shown in FIG. 3(A) is a side view of FIG. 2, and FIG. 3(B) is an explanatory diagram of the 1-position fixing means after setting according to FIG. 2. 3...-Capstan roller 4...Flywheel 7...Socket plate 8...Adjustment screw 6.9...
・Top Agent Patent Attorney Noriyuki Chika't&-A111& Figure 1 Figure 2 Figure 3 (A) (B)

Claims (2)

[Claims] (1) The gap between the receiving plate, which is rotatably provided through the board and has a function of stopping the axial movement of the rotating shaft tip, and the rotating shaft tip is placed at the extended position of the rotating shaft tip of the receiving plate. In the setting method using a provided adjustment screw, the adjustment screw is rotated in a first direction to curve the receiving plate by a predetermined amount; and the adjusting screw is rotated from the position where the receiving plate is bent by this means. and a means for rotating a predetermined number of rotations in a second direction, and setting a gap between the tip of the adjusting screw and the tip of the rotating shaft. (2) The gap setting method according to claim 1, wherein the rotating shaft is a capstan shaft of a tape recorder.