JPH02201724A - Rotary magnetic head cleaning device for magnetic recording/reproducing equipment - Google Patents

Abstract

PURPOSE:To improve the cleaning performance of a brush, to maintain an effect for a long time, and to improve the serviceability, reliability and economization of equipment by rotating the cleaning brush while moving it in the rotation axis direction. CONSTITUTION:A groove 19 for movement provided on the internal peripheral surface of a collar 16 is formed obliquely in the axial direction of a supporting shaft 10. A positioning pin 20 fixed on the external peripheral surface of the supporting shaft 10 slides inside the groove 19. When a brush 9 is pressured to the external peripheral surface of a rotary cylinder, the brush 9 starts rotation by frictional force, and cleans the head while repeatedly moving in the axial direction by the positioning pin 20. Thus a speed in the axial direction is generated in the brush 9, foreign materials attached to the head is swept away, since contact at the same position is reduced, the usable time of the brush 9 can be drastically extended, a replacing frequency is decreased, and the serviceability, reliability and economization of the equipment can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating magnetic head cleaning device for a magnetic recording/reproducing device such as a video tape recorder, and particularly to improving the cleaning effect thereof.

[Conventional technology]

3 is a longitudinal sectional view of a rotating head assembly of a video tape recorder, FIG. 4 is a plan view of a rotating head assembly equipped with a conventional rotating magnetic head cleaning device, FIG. 5 is a front view of FIG. 4, and FIG. The figure is a longitudinal sectional view of the cleaning brush of FIG. 4.

First, the structure of the rotary head assembly will be explained based on FIG. In the figure, (1) is a magnetic tape, (2) is a fixed cylinder (3) having a lead groove (201) on its outer circumferential surface that guides the running of the magnetic tape (1), and is rotatably supported by the fixed cylinder (2). The central axis (4) is the bearing, (5) is the fixed cylinder (2) via the bearing (4).
a rotating cylinder (6) rotatably supported on the rotating cylinder (5) for rotation for recording information on the magnetic tape (1) or reproducing information already recorded on the magnetic tape (1); A magnetic head (hereinafter simply referred to as a head), a rotary transformer that transmits and receives information contactlessly between the head (6) and a stationary signal processing circuit (not shown), and a rotating cylinder (8). 5) is an electric motor that rotationally drives.

Next, the operation will be explained. When the rotating cylinder (5) is rotated by the electric motor (8), the head (6) also rotates around the central axis (3) and is guided along the lead groove (201) to connect the fixed cylinder (2) and the rotating cylinder. (5) Information is recorded and reproduced on the magnetic tape (1) running on the outer peripheral surface of the magnetic tape (1).

During this time, information to be recorded or reproduced is exchanged between the head (6) and the signal processing circuit without contact via a rotary transformer (force).However, while the magnetic tape (1) is running, When 1) comes into frictional contact with the head (6) etc., magnetic powder may peel off from the magnetic tape (1) and stick to the head (6), or foreign matter adhering to the surface of the magnetic tape (1) may be removed. It will adhere to the head (6) and impair good recording and reproduction.

Therefore, in order to remove foreign matter such as magnetic powder adhering to the head (6), a cleaning device for cleaning the head (6) has been conventionally built into the magnetic recording/reproducing apparatus. Such a conventional head cleaning device will be explained based on FIGS. 4 to 6.

In the figure, (9) is a roller-shaped cleaning brush (hereinafter simply referred to as a brush) made of a soft material such as felt or sponge, (10) is a support shaft that rotatably supports the brush (9), and (11) is a support shaft. A rotating arm (12) supporting the shaft (10) at one end, the brush (9) is connected to the rotating cylinder (5).
) and the head (6), and the plunger (121) is pressed against the pressure regulating spring (1
3) to the other end of the rotating arm (11). (14) is a bin that rotatably supports the intermediate point of the rotating arm (11), (15) is the return spring of the rotating arm (11), (16) is the collar of the cleaning brush (9), and (17a) is the return spring of the rotating arm (11).
), (17b) are the collar (16) supported by the support shaft (1
This is a retaining ring to keep it at 0). The cleaning device described above is mounted on a support bracket (18) attached to a stationary cylinder (2).

Next, we will explain the operation of the cleaning device.

When you want to clean the head (6), use the solenoid (12)
The plunger (121) may be attracted by energizing the plunger (121).

When the plunger (121) is sucked, the pressure regulating spring (1
3), the rotary arm (11) rotates clockwise around the bottle (14), so that the brush (9) rotates on the outer peripheral surface of the rotary cylinder (5) as shown in FIG. and is pressed against the head (6). The force of this pressing is adjusted by the strength of the pressure regulating spring (13). When the brush (9) is pressed against the outer peripheral surface of the rotating rotating cylinder (5), it begins to rotate around the support shaft (10) due to the frictional force with this outer peripheral surface, and the rotating cylinder (
It rotates at approximately the same peripheral speed as 5). The brush (9) removes magnetic powder and other foreign matter that adhere to the head (6) when it comes into contact with the head (6) during rotation. After cleaning is completed, deenergize the solenoid (12) and release the return spring (15).
) to rotate the rotary arm (11) counterclockwise around the bottle (14) to separate the brush (9) from the rotating head (6).

[Problem to be solved by the invention]

Since the conventional rotating magnetic head cleaning device is constructed as described above, the circumferential speeds of the brush (9) and the head (6) rotate at approximately the same speed, so that the head (6) due to the speed difference
) is less effective in wiping away foreign matter, and since the head (6) always hits the same circumference of the brush (9), as the number of cleaning increases, only a portion of the brush (9) wears out in a ring shape. When the brush (9) is deformed, the contact pressure of the brush (9) against the head (6) is reduced, and the cleaning effect is degraded. Therefore, in order to maintain a constant cleaning effect, it is necessary to increase the pressure applied to the brush or to frequently replace the brush.

This invention was made to solve the above-mentioned problems, and it improves the cleaning performance of the brush, maintains its effectiveness for a long time, and improves the serviceability, reliability, and economic efficiency of the equipment. It is an object of the present invention to provide a rotating magnetic head cleaning device for a magnetic recording/reproducing device.

[Means to solve the problem]

In the rotating magnetic head cleaning device according to the present invention, the cleaning brush repeatedly moves in the direction of the rotation axis of the rotary cylinder while rotating.

[Effect]

In this invention, the cleaning brush is rotated while moving in the direction of the rotation axis to generate speed in the direction of the rotation axis, and the contact position between one magnetic head and the brush is continuously changed so that the cleaning brush is moved at the same location. This reduces the number of times the head comes into contact with the head, reducing wear and deformation.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. FIG. 1 is a vertical cross-sectional view of the cleaning brush, and FIG. 2 is an enlarged perspective view of the collar shown in FIG. 1. The same parts as those of the prior art are designated by the same reference numerals and their explanation will be omitted. In the figure, (19) is a movement groove provided on the inner peripheral surface of the collar (16), and is formed obliquely with respect to the axial direction of the support shaft (10). (20) is a positioning pin fixed to the outer peripheral surface of the support shaft (10), which slides in the groove (19).

When the brush (9) is pressed against the outer circumferential surface of the rotating cylinder (5), the brush (9) begins to rotate due to the frictional force and moves repeatedly in the axial direction by the positioning pin (20) until the head (6) Clean. When the brush (9) is rotated while moving in the direction of the rotation axis in this way, speed in the direction of the rotation axis is generated in the brush (9) and the contact position between the head (6) and the brush (9) is continuously changed. This reduces the number of times the head (6) comes into contact with the head (6) at the same location, reducing the amount of wear and deformation.

In the above embodiment, the axial movement of the brush (9) is caused by the groove (19) of the collar (16) and the pin (20) of the support shaft (10).
), but the same effect as in the above embodiment can be obtained even if other driving force such as a solenoid is used.

〔Effect of the invention〕

As described above, according to the present invention, the brush can be moved in the axial direction during the cleaning operation using a simple configuration.
The axial speed of the brush makes it possible to wipe off foreign matter adhering to the head, and since there is less contact at the same point, the usable life of the brush is greatly extended, reducing the frequency of replacement, which improves the serviceability of the equipment. Effects such as improved reliability and economic efficiency can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a cleaning brush showing an embodiment of the present invention, FIG. 2 is an enlarged perspective view of the collar shown in FIG. 1, FIG. 3 is a vertical cross-sectional view of a rotary head assembly, and FIG. 4 is a conventional cleaning brush. FIG. 5 is a front view of the rotary head assembly equipped with the rotary magnetic head cleaning device of FIG. 4, and FIG. 6 is a longitudinal sectional view of the cleaning brush of FIG. 4. In the figure, (1) is a magnetic tape, (2) is a fixed cylinder, (5) is a rotating cylinder, (6) is a rotating magnetic head, (7) is a rotary transformer, (8) is an electric motor, (
9) is a cleaning brush, (10) is a support shaft, (11) is a rotating arm, (12) is a solenoid, (121) is a plunger, (13) is a pressure regulating spring, (15) is a return spring, (1
6) is the collar, (19) is the groove for moving the brush, (20)
indicates a positioning pin. The same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa, patent attorney, G! :! L

Claims (1)

[Claims] (1) A rotating magnetic head that is supported by a rotating cylinder that is rotatably supported from a fixed cylinder that guides the running of the magnetic tape and that records and reproduces information on the magnetic tape, and an outer peripheral surface of the rotating cylinder and the rotating magnetic head. In the cleaning device, the cleaning brush is rotated by the rotation of the rotary cylinder and is pressed against the rotary cylinder, and includes a cleaning brush that cleans the rotary magnetic head. A rotating magnetic head cleaning device for a magnetic recording/reproducing device, characterized in that: