JPH0877523A - Magnetic head cleaning device - Google Patents

Abstract

PURPOSE: To prevent a rotary head drum from being flawed and stained with dust in cleaning of a rotary magnetic head. CONSTITUTION: A main arm 8 is freely turnably provided on a shaft 15 fixed to a magnetic recording and reproducing device while the main arm 8 is energized around this turning shaft by a spring, and similarly, an auxiliary arm 18 is freely turnably provided on a shaft 16 provided in the main arm 8 while the auxiliary arm 18 is energized around this turning shaft by a spring. Moreover, a roller 100 is freely rotatably provided on the tip of the auxiliary arm 18, and the roller is oscillated along the peripheral side surface of the rotary head drum 1 mounted with the magnetic head in synchronization with loading of a tape cassette.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head cleaning device, and more particularly to a magnetic head cleaning device for removing foreign matter adhering to a rotary magnetic head used exclusively for recording / reproducing and reproducing of a magnetic tape.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus for recording / reproducing and only reproducing (hereinafter simply referred to as "recording / reproducing") by a helical scan method using a rotary magnetic head such as a VTR device, a gap portion of a magnetic head is provided. If a foreign substance adheres, normal recording / reproduction cannot be performed, and there is a device provided with a cleaning device for removing this foreign substance.

Generally, in this magnetic head cleaning device, a cleaning roller is brought into pressure contact with the peripheral side surface of a rotary head drum only when loading and unloading a magnetic tape, and the drum is rotated in this state to rub the magnetic head and the cleaning roller. The foreign matter adhering to the gap of the magnetic head is removed.

Next, a conventional magnetic head cleaning device 105 will be described with reference to FIGS.

First, the structure of the rotary head drum 1 of a magnetic recording / reproducing apparatus such as a VTR will be described. As shown in FIG. 5, it comprises a stationary side drum 2 and a rotating side drum 3, and the stationary side of the rotating side drum 3 is described. A magnetic head 4 is attached to the surface facing the drum 2, and the head end of the magnetic head 4 slightly protrudes from the drum peripheral side surface 5.

Next, the magnetic head cleaning device 10
5 is a shaft 1 provided on the fixing member 106 as shown in FIG.
07, an arm 108 rotatably held, a spring 112 for biasing the arm 108 around a shaft 107, a cleaning roller 100 rotatably provided at the tip of the arm 108, and the arm 108. A protrusion 114 is provided at the center of the holder for receiving the moving rod 17 that moves in conjunction with the loading of the tape cassette.

The cleaning roller 100 has a spring 112 provided between the fixing member 106 and the arm 108.
By the force of the
When the rotation side drum 3 of the rotary head drum 1 is rotated in a state in which the cleaning roller 100 is in pressure contact with the cleaning roller 100, the cleaning roller 100 rubs against the tip end of the magnetic head 4 protruding from the drum peripheral side surface 5. Foreign matter adhering to the magnetic head is removed,
The magnetic head 4 will be cleaned.

The operation of the conventional magnetic head cleaning device 105 during recording / reproducing of the magnetic tape will be described below with reference to FIGS. 4 (a) and 4 (b).

First, when the tape cassette 20 is inserted into the magnetic recording / reproducing apparatus and the loading operation is started, the moving rod 17 which is a part of the loading mechanism moves in the direction of arrow a, and the moving rod 17 moves the arm 108. It contacts the protrusion 114 protruding from the [Fig. 4 (a)].

As the tape cassette 20 is further loaded, the arm 108 rotates against the force of the spring 112, and the cleaning roller 100 is separated from the drum peripheral side surface 5 of the rotary head drum 1. The tape cassette 20 is inserted and stopped up to a recording / reproducing position, but at this position, the cleaning roller 100 is completely held away from the rotary head drum 1 [FIG. 4 (b)]. Therefore, the cleaning roller 100 does not hinder the winding operation of the magnetic tape around the rotary head drum 1 and the tape running.

When the tape cassette 20 is unloaded, the moving rod 17 moves in the direction of the arrow a in conjunction with this operation.
, The position of the arm 108 is restored by the force of the spring 112, and the cleaning roller 1 moves.
00 returns to the state of being pressed against the drum peripheral side surface 5 of the rotary head drum 1 [FIG. 4 (a)].

During the loading and unloading operations, the cleaning roller 100 also rotates to clean the magnetic head 4 only while the cleaning roller 100 is in pressure contact with the rotating rotary head drum 1.

Next, the structure and operation of the cleaning roller 100 will be described. First, the cleaning roller 1
5, 00 is attached to the arm 108 by inserting it through a collar 10 into a shaft 109 provided at the tip of the arm 108 as shown in FIG.
00 is rotatably held so that it will not fall out.

The structure of the cleaning roller 100 is, as shown in FIGS. 6A and 6B, a cylindrical roller 130 formed of a porous and elastic material, for example, polyurethane, and the cylindrical roller 130. The polishing material 120 covers all or part of the peripheral side surface of the roller.

The polishing material 120 is a sheet-like polishing cloth having a moderate hardness, which is obtained by adhering fine abrasive grains to a non-woven fabric or a woven fabric having a three-dimensional mesh structure, and the peripheral side surface of the cylindrical roller 130. It is fixed to the adhesive with adhesive or the like. The fine abrasive grains may be any of aluminum oxide, silicon oxide, chromium oxide, iron oxide, silicon carbide, etc., and their size is uniform with a grain size of 2 μm or less so as not to roughen the surface to be polished. .

During the cleaning of the magnetic head 4 by the cleaning roller 100, the fine abrasive grains adhering to the polishing cloth always polish the surface of the magnetic head 4 to remove foreign matters adhering to the magnetic head 4. . The pressing force of the cleaning roller 100 against the rotary head drum 1 is 1
The amount of polishing is suppressed to about 0 g so that the polishing force does not become excessively strong, and the wear of the magnetic head 4 is prevented.

Conventional magnetic head cleaning device 105
During the cleaning operation, the cleaning roller 100 does not move on the drum peripheral side surface 5 of the rotary head drum 1, but rotates at a certain position where the rotary drum 3 is rotated. Therefore, the rotating drum 3 that is rotating is in contact with the cleaning roller 100 over the entire circumference of the drum, but the stationary drum 2 that is not rotating is in contact only with the fixed pressure contact portion. Only the portion of the fixed side drum 2 that is in pressure contact with the cleaning roller 100 is locally rubbed.

When a material having an abrading force is used for the cleaning roller 100 in order to enhance the cleaning ability, the cleaning roller pressure contact portion of the fixed side drum 2 is scraped by the cleaning roller 100 as shown in FIG. A part of the polishing dust scatters, and a plurality of times of contact with the cleaning roller 100 gradually forms a residue reservoir 160 near the pressure contact portion.

[0019]

A fixed portion of the rotary side drum 1 of the fixed side drum 2 of the stationary side drum 2 which is in pressure contact with the cleaning roller 100 is locally rubbed, and the polishing dust scraped off by this. Are scattered, and by a large number of contact with the cleaning roller 100, a residue reservoir 160 is gradually formed in the vicinity of the pressure contact portion.

Further, since the dust accumulation 160 is formed on the magnetic tape traveling locus 150, there is a possibility that the magnetic tape may be scratched during traveling of the magnetic tape or transferred to the magnetic tape to cause dropout during recording and reproduction. It was Further, the pressure contact portion of the fixed side drum 2 is scraped off, so that the drum peripheral side surface 5 becomes non-uniform, which may impair the stable running of the magnetic tape.

[0021]

SUMMARY OF THE INVENTION The present invention was devised to solve these problems, in which a main mechanism arm is rotatably held by a shaft mechanism provided in a magnetic recording / reproducing apparatus and a spring is used. Urges the main arm around the rotation axis, and similarly holds the auxiliary arm rotatably in the shaft mechanism provided on the main arm and urges the auxiliary arm around the rotation axis by a spring. Further, a roller is rotatably provided at the tip of the auxiliary arm, and the roller swings along the peripheral side surface of the rotary head drum having the magnetic head in synchronization with the loading of the tape cassette. Settled.

[0022]

In the magnetic head cleaning device having the above structure, the cleaning roller is brought into pressure contact with the rotary head drum,
By contacting and swinging along the peripheral side surface of the rotary head drum, fine abrasive particles adhered or applied to the surface of the cleaning roller are formed on the peripheral side surface of the fixed side drum at the same time as polishing the surface of the magnetic head. Since the pool is removed, the foreign matter attached to the magnetic head can be removed without soiling the rotary head drum. Furthermore,
There is no possibility that a specific portion of the peripheral side surface of the fixed drum will be scraped off.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic head cleaning device according to the present invention will be described with reference to FIGS.

First, the structure of the magnetic head cleaning device 50 will be described. As shown in FIG. 1, a fixing member 6 for fixing the magnetic head cleaning device 50 to the magnetic recording / reproducing device, and a shaft 15 provided on the fixing member 6. , Axis 15
A shaft column 1 having a main arm 8 rotatably held by the main arm 8 and a column provided on the main arm 8 and protruding from the upper surface of the main arm 8.
6 and an auxiliary arm 18 rotatably held by a shaft 16
The cleaning roller 100 is rotatably held at the tip of the auxiliary arm 18. It goes without saying that the shaft holding the main arm 8 may be directly formed on the structural frame of the magnetic recording / reproducing apparatus.

The spring 12 is held by the pin 33 of the fixing member 6, one end of the spring 12 is fixed to the pin 30 of the fixing member 6 and the other end is fixed to the pin 31 of the main arm 8, and the main arm 8 is It is urged around the shaft 15. The spring 13 is held by the shaft 16 of the main arm 8. One end of the spring 13 is fixed to the pin 31 of the main arm 8 and the other end is fixed to the pin 32 of the auxiliary arm 18. It is biased around the shaft 16. Therefore, the auxiliary arm 1
The cleaning roller 100 held at the tip of 8 is brought into pressure contact with the rotary head drum 1.

As described above, the cleaning roller 100
When the rotating side drum 3 of the rotary head drum 1 is rotated in a state where the rotary head drum 1 is pressed against the peripheral side surface 5 of the rotary head drum 1,
As shown in FIG. 5, the cleaning roller 100 is rubbed against the tip of the magnetic head 4 protruding from the drum peripheral side surface 5, whereby foreign matter adhering to the magnetic head 4 is removed and the magnetic head 4 is cleaned. become.

Next, the operation of the magnetic head cleaning device 50 of the present invention when the tape cassette 20 is attached to and detached from the magnetic recording / reproducing apparatus will be described with reference to FIGS.
Will be described with reference to.

First, when the tape cassette 20 is inserted into the magnetic recording / reproducing apparatus and loading is started, the tape cassette 20 moves in the direction of arrow a, and the moving rod 17 of the magnetic recording / reproducing apparatus also synchronizes with the direction of arrow a. To contact the shaft 16 of the magnetic head cleaning device 50. Up to this point, the cleaning roller 100 is in pressure contact with the drum peripheral side surface 5 of the rotary head drum 1 at an arbitrary position [FIG.
(A)].

Further, as the tape cassette 20 moves in the direction of arrow a, the moving rod 17 also moves in the direction of arrow a,
By pushing the pillar of the shaft pillar 16 protruding from the upper surface of the arm 18, the main arm 8 and the auxiliary arm 1 are driven by the force of the springs 12 and 13.
8 is pushed open, so that the cleaning roller 100 causes the drum peripheral surface 5 of the rotary head drum 1 to move toward the arrow b in FIG. 2 (b).
In the direction of [Fig. 2 (b)].

As the loading operation proceeds further, the moving rod 17
When is moved in the direction of arrow a, the opening of the auxiliary arm 18 is blocked by the restriction protrusion 24, so that the cleaning roller 100 separates from the drum peripheral surface 5 of the rotary head drum 1 against the force of the spring 12. Tape cassette 2 from this point
Until 0 is completely loaded, the regulated auxiliary arm 18 and the main arm 8 integrally rotate about the shaft 15 and are sufficiently separated from the rotary head drum 1 [Fig. c)].

Therefore, the cleaning roller 100 is configured to be sufficiently separated from the rotary head drum 1 when the tape cassette 20 is completely loaded, so that the cleaning roller 100 winds the magnetic tape around the rotary head drum 1 and runs the tape. There is no hindrance.

When the tape cassette 20 is taken out, the moving rod 17 moves in the direction opposite to the arrow a, and the cleaning roller 100 causes the spring 1 to move as described above.
The forces of 2 and 13 restore the initial state in which the rotary head drum 1 is pressed against the peripheral surface 5 of the rotary head drum 1 [FIG. 2 (a)]. The mechanism and operation of the cleaning roller 100 are the same as those of the conventional example, and the description thereof will be omitted.

[0033]

In the magnetic head cleaning device of the present invention, the cleaning roller is brought into pressure contact with the rotary head drum and oscillated along the peripheral side surface of the rotary head drum to polish the surface of the magnetic head and at the same time to the fixed side. Since the residue accumulated on the peripheral side surface of the drum is removed, the foreign matter attached to the magnetic head can be removed without soiling the rotary head drum.

Further, since a specific portion of the fixed side drum is not scraped off, a uniform peripheral side surface can be secured and the magnetic tape can be stably run.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a magnetic head cleaning device of the present invention.

2A and 2B are schematic linear plan views showing the operation of the magnetic head cleaning device of the present invention, where FIG. 2A shows a state in which the cleaning roller is in rolling contact with the rotary head drum, and FIG. 2B shows the cleaning roller in the rotary head drum. (C) is a state in which the cleaning roller is separated from the rotary head drum.

FIG. 3 is a schematic plan view of a conventional magnetic head cleaning device.

4A and 4B are schematic linear plan views showing the operation of the conventional magnetic head cleaning device. FIG. 4A shows a state in which the cleaning roller is in rolling contact with the rotary head drum, and FIG. 4B shows the cleaning roller from the rotary head drum. It is in a state of being separated.

FIG. 5 is a cross-sectional side view of a cleaning roller that is in rolling contact with a rotary head drum.

FIG. 6 is a schematic perspective view of the cleaning roller, in which (a) shows the polishing material provided on the entire circumferential side surface, and (b) shows the polishing material dividedly provided on the circumferential side surface. It is a thing.

FIG. 7 is a schematic perspective view showing a contact state between a cleaning roller and a rotary head drum in a conventional magnetic head cleaning device.

[Explanation of symbols]

 1 rotating head drum 2 fixed side drum 3 rotating side drum 4 magnetic head 5 drum peripheral side 6, 106 fixing member 8 main arm 9, 15, 107, 109 shaft 10 color 11 washer 12, 13, 112 spring 16 shaft post 17 movement Rod 18 Auxiliary arm 19 Hole 20 Tape cassette 24 Restriction protrusion 30, 31, 32, 33 pins 100 Cleaning roller 108 Arm 114 Protrusion 120 Abrasive material 130 Cylindrical roller

Claims (3)

[Claims] 1. A magnetic head cleaning device for a rotary magnetic head for recording / reproducing on / from a magnetic tape, wherein a main arm is rotatably held by a shaft mechanism provided in the magnetic recording / reproducing device, and the main arm is rotated by an elastic body. Auxiliary arm is rotatably held by a shaft mechanism provided on the main arm, and the auxiliary arm is urged by an elastic body around the rotary shaft. A magnetic head cleaning device characterized in that a roller is rotatably provided at the tip of the magnetic head, and the roller swings along the peripheral side surface of a rotary head drum having a magnetic head in synchronism with the loading of a tape cassette. . 2. A magnetic head cleaning device for a rotary magnetic head for reproducing a magnetic tape, wherein a main arm is rotatably held by a shaft mechanism provided in the magnetic reproducing device, and the main arm is made of an elastic body for rotating the main shaft. The auxiliary arm is rotatably held by a shaft mechanism provided on the main arm, and the auxiliary arm is urged by an elastic body around the rotary shaft, and the tip of the auxiliary arm is further urged. A magnetic head cleaning device, wherein a roller is rotatably provided on the magnetic head, and the roller swings along a peripheral side surface of a rotary head drum having a magnetic head in synchronism with loading of a tape cassette. 3. The magnetic head cleaning device according to claim 1, wherein a protrusion is provided on the main arm to define a rotation range of the auxiliary arm.