JPH087237A - Method for controlling magnetic head cleaning system of magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To reduce the occurrence of damage, wear of a magnetic head or a noise occurring when the magnetic head is cleaned by reducing the number of revolutions of a rotary cylinder during magnetic head cleaning operating than that at the time of recording/reproducing. CONSTITUTION:By constituting so that a cleaning member 1 is abutted on the rotary cylinder 105 on the way of turn operation, an engagement part 3d between a projection part 6g of a drive lever and a cleaning arm 3 is released. Thus, the cleaning member 1 is depressed by the rotary cylinder 105 by the load of a spring 10. At this time, by controlling a rotary cylinder drive circuit 202 so that the rotary cylinder 105 is rotated and driven at the number of revolutions smaller than that at the time of recording/reproducing by a command of a system control part 200, the magnetic head 104 is cleaned properly.

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 system control method in a magnetic recording / reproducing apparatus such as a video tape recorder (hereinafter referred to as VTR).

[0002]

2. Description of the Related Art As is well known, in most VTRs constructed such that a magnetic tape stored in a cassette is wound around a rotary cylinder at a predetermined angle for magnetic recording and reproduction, the magnetic head is always kept clean. It has a magnetic head cleaning system for the purpose. In these magnetic head cleaning systems, a cleaning member for a magnetic head is arranged in the vicinity of a rotary cylinder as seen in JP-B-63-29329 and JP-A-60-89810, and the cleaning member is used for recording and reproduction. Number of revolutions (eg 30 revolutions per second)
The magnetic head is cleaned by bringing it into contact with the outer circumference of the rotating cylinder.

[0003]

In the above-mentioned prior art, while the cleaning member is in contact with the rotary cylinder, the magnetic head comes into contact with the cleaning member at a very large speed, so that the magnetic head is damaged, worn, or causes noise. There was a concern that a problem would occur.

An object of the present invention is to provide a method of controlling a magnetic head cleaning system that solves the above-mentioned problems caused when cleaning the magnetic head.

[0005]

In order to achieve the above object, the present invention provides a magnetic head cleaning system in which the rotational speed of the rotary cylinder during the magnetic head cleaning operation is made smaller than the rotational speed during recording and reproduction. The control method was used.

[0006]

The rotary cylinder is rotationally driven by a cylinder motor controlled by a system control unit using a microcomputer via a rotary cylinder drive circuit. Further, the magnetic head cleaning mechanism is also operated by a mechanism drive motor controlled by the system control unit via the loading motor drive circuit. With the above-described configuration, the system control unit can control the rotation speed of the rotary cylinder according to the operating status of the magnetic head cleaning mechanism.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a block diagram of a magnetic head cleaning system, and FIG. 2 is a VTR in which a magnetic tape is stored in a cassette.
Mechanical state diagram, FIG. 3 is a state diagram of the VTR mechanism in which the magnetic tape is pulled out of the cassette, and FIG. 4 is a non-operating state of the tape pulling member (state in which the magnetic tape is stored in the cassette).
6 is a plan view of the tape pull-out member in an operating state (a state in which the magnetic tape is pulled out of the cassette), FIG.
FIG. 7 is a plan view of an operating state of a main part of the magnetic head cleaning mechanism, FIG. 7 is a sectional view of a cleaning member, FIG. 8 is a plan view of an operating state of the magnetic head cleaning mechanism, and FIG. 9 is a non-operating plan view of a magnetic head cleaning mechanism. 10 is a side view of a main part of the magnetic head cleaning mechanism in an operating state, and FIG. 11 is an exploded perspective view of the main part of the magnetic head cleaning mechanism.

First, the outline of the VTR mechanism will be described. As shown in FIG. 2, the magnetic tape 106 is housed in a cassette 107 while being wound around a pair of reels 108. Here, when recording a magnetic signal on the magnetic tape 106 or reproducing a magnetic signal already recorded on the magnetic tape 106, the magnetic tape 106 is pulled out in the arrow direction by the tape pulling member 109 as shown in FIG. The magnetic head 104 wound around the rotary cylinder 105 at a predetermined angle and arranged on the outer periphery of the rotary cylinder.
(FIG. 2), recording and reproduction of magnetic signals are performed. (This is a known technique.) Next, details of one embodiment of the present invention will be described below. First,
The configuration will be described, and then the operation will be described.

First, the magnetic tape 106 is loaded into the cassette 1.
A structure for pulling out from 07 and storing will be described with reference to FIGS. 4 and 5. 4 and 5, the output shaft 11 of the loading motor 110 (hereinafter referred to as the motor 110)
A worm gear 111 is integrally coupled to the wheel 0a and rotates in mesh with the worm gear 111.
12 and a cam gear 113 that rotates by meshing with the worm wheel 112 are rotatably supported on the chassis 100 (FIGS. 2 and 3). The cam gear 113 is provided with a cam groove 113a on the back side thereof, and the worm wheel 1
A pin 103a installed on the pull-out arm 103 having the rotation axis of 12 as a rotation axis is fitted in the cam groove 113a. A rotation shaft hole 103 is provided at one end of the drawer arm 103.
c, a rack engaging hole 103d is provided on the other end side, and an arcuate portion 103b is provided on the tip end portion thereof. The rack plate 114 slidably mounted in the longitudinal direction on the chassis 100 (FIGS. 2 and 3) has a rack gear 1 at one end side.
14a, a rack boss 114b is provided on the other end side, and the rack boss 114b is inserted into the rack engaging hole 103d of the drawer arm 103. The tape pull-out member 109 is mounted on the chassis 100 (FIGS. 2 and 3) so as to be movable along a predetermined path.
By the rotation of 5, 116, the first arm 117, 119 and the second arm 118, 120 are movable by a predetermined distance. The above is the configuration for pulling out and storing the magnetic tape 106 from the cassette 107.

Next, the structure of the magnetic head cleaning mechanism will be described with reference to FIGS. The configuration of the cleaning member 1 (FIG. 7) is
Insert the cleaning member 1 into the shaft body 1a, and from above, cap body 1b
Is press-fitted and coupled to the shaft body 1a. A flange portion 1c is provided on the lower portion of the shaft body 1a. The cleaning member 1 is rotatably disposed on the outer circumference of the rotary cylinder 105 at a height at which it can abut the magnetic head 104, on a shaft 3 a erected on the cleaning arm 3. That is, the cleaning arm 3 is provided with the above-mentioned shaft 3a on the front end side, the rotary shaft hole 3c on the other end side, and the shift lever hole 3b on the intermediate portion. The shift lever shaft 2b of the shift lever 2 is fitted into the shift lever hole 3b of the cleaning arm 3, and the shift lever 2 is rotatably supported with respect to the cleaning arm 3. In this state, the operating portion 2a provided at the tip of the shift lever 2
Are inserted between the flange portions 1c of the cleaning member 1. Further (FIG. 10), a spring 9 is hung between the shift lever 2 and the cleaning arm 3 to urge the cleaning member 1 upward. A cam contact portion 2c is provided at the end of the shift lever 2 opposite to the operation portion 2a.

Thus, the cleaning member 1 and the shift lever 2
The cleaning arm 3 in which is mounted is mounted on the pillar 101 erected on the chassis 100 (after the driving lever 6 is mounted on the pillar 101) through the rotation shaft hole 3c. The cam roller 4 is arranged at a position (a position below the cam contact portion 2c in this embodiment) where it can contact the cam contact portion 2c of the shift lever 2 incorporated in the cleaning arm 3, and the cam roller 4 is attached to the chassis 100. The roller shaft 102 is installed upright and is assembled together with the one-way clutch coil member 7. An upper end surface portion of the cam roller 4 forms an end surface cam 4a, and a sawtooth portion 4b is formed in a lower portion thereof. Further, the one-way clutch coil member 7 is incorporated over the seat portion 102a of the roller shaft 102 and the shaft cylinder portion 4c formed on the cam roller 4.

Here, the shape of the one-way clutch coil member 7 is a cylindrical shape by spirally winding a stainless steel wire for spring or the like while maintaining a certain inner diameter. With respect to the inner diameter of the one-way clutch coil member 7, the seat portion 102a
And the outer diameter of the shaft tube portion 4c is set to be slightly larger,
By setting the spiral winding direction of the one-way clutch coil member 7 to the right, the cam roller 4 (in FIG. 6)
A so-called one-way rotation mechanism is obtained in which rotation is possible in the direction of the arrow R (clockwise rotation), but rotation in the counterclockwise direction is blocked (that is, a well-known one-way clutch using a coiled spring body). Form a mechanism). Further, the above-described support column 101 standing on the chassis 100 is installed below the cleaning arm 3 and the drive lever 6 also having the support column 101 as a rotation center is inserted by inserting the rotation shaft hole 6c into the support column 101. ing.

A cam portion 6a is formed below the intermediate portion of the drive lever 6 and is operated by an arc portion 103b formed at the tip of the pullout arm 103. In addition, a boss 6b, a locking claw 6e, and a hook portion 6d are provided on the intermediate portion and the upper surface portion. Reverse L-shaped ratchet lever 5
Is a claw portion 5a on one end side and a ratchet lever 5 on the other end side.
An elastic arm portion 5b is integrally formed for urging, and a shaft hole 5c is provided in the middle portion. The elastic arm portion 5b is inserted into the boss 6b of the drive lever 6 and attached by the locking claw 6e so as not to fall off. The ratchet lever 5 is mounted on the drive lever 6 so as to be rotatable within a predetermined range, and attached by being given a clockwise rotational force by the elastic arm portion 5b (FIG. 6). A spring 11 is provided between the hook 6f provided on the side surface of the intermediate portion of the drive lever 6 and the chassis 100 to apply a rotational force in the clockwise direction to the drive lever 6. The drive lever 6 rotatably attached to the support column 101 is further provided with a protrusion 6g in the vicinity of the rotation shaft 6c. Similarly, the drive lever 6 is rotatably attached to the support column 101.
By preventing the cleaning arm 3 from rotating counterclockwise with respect to the drive lever 6, the locking portion 3d is configured to contact the protrusion 6g when the cleaning arm 3 is mounted on the cleaning lever 3. Is done. A spring body 10 is hung between the hook portion 6d of the drive lever 6 and the tip portion of the locking portion 3d of the cleaning arm 3, and the drive lever 6 has a clockwise turning force.
The cleaning arm 3 is coupled via the spring body 10 (by the spring body 10) in the state where the counterclockwise rotating force is applied.

FIG. 1 is a block diagram showing the control of the magnetic head cleaning system according to the present invention. The system control unit 200 controls the entire system and is composed of a microcomputer. The rotary cylinder drive circuit 202 drives the rotary cylinder 105 to rotate according to a command from the system control unit 200. The detection switch 204 is a loading motor 110 (hereinafter abbreviated as motor 110).
It has a function of detecting the position of the tape loading means including the. The loading motor drive circuit 203 is a circuit that controls the rotational drive of the motor 110 to a normal rotation (normal rotation), a reverse rotation (reverse rotation), or a stopped state according to a command from the system control unit 200.

The operation of the magnetic head cleaning system having the above structure will be described below.

As described above, the motor 110 is used to pull out and store the magnetic tape 106 from the cassette 107.
(FIGS. 4 and 5), the worm gear 111, the worm wheel 112, and the cam gear 113 are rotationally driven, and the cam groove 113a of the cam gear 113 is also rotationally displaced. As a result, the pull-out arm 103 in FIG.
The rack plate 114 is rotated in the arrow direction (clockwise rotation) and pulled up in the arrow direction, and the drive gears 115 and 116 are rotationally driven by the movement of the rack plate 114, so that the first arms 117 and 119 and the second arm. The tape pull-out member 109 moves via 118 and 120, and the magnetic tape 106
It has been described above that the magnetic head 104 carries out predetermined magnetic recording / reproduction by pulling out and winding it around the rotary cylinder 105. Further, when the magnetic tape 106 is stored in the cassette 107, the reverse operation described above is performed.

Next, by utilizing the movement of the pull-out arm 103 that operates when the magnetic tape 106 is pulled out and stored,
The operation of the present invention that enables the magnetic head cleaning mechanism to operate and also makes the rotational speed of the rotary cylinder 105 at this time smaller than the rotational speed at the time of recording / reproducing will be described below.

FIG. 9 shows a non-operating state of the magnetic head cleaning mechanism. FIG. 8 also shows an operating state. Further, FIG. 6 shows this FIG. 8 in detail. Drawer arm 103 that operates to pull out and store the magnetic tape 106
Is displaced from P1 to positions P2 and P3 (in FIGS. 8 and 9). P1 is when the magnetic tape 106 is stored, P3 is when the magnetic tape 106 is pulled out, and P2 is in the process of pulling out or storing the magnetic tape 106. Normal Figure 9
When the magnetic head cleaning mechanism is in the non-operating state as described above, the drive lever 6 is applied with a biasing force of clockwise rotation by the spring 11 and is locked at the end surface portion of the chassis 100 in the arrow direction. In this state, the cleaning arm 3 has the locking portion 3d locked to the protrusion 6g of the drive lever 6 by the spring body 10, and the cleaning member 1 mounted on the cleaning arm 3 is also attached to the rotary cylinder 105. Are separated from each other. Next, the operation of the magnetic head cleaning mechanism shown in FIGS. 6 and 8 in the operating state will be described. When the magnetic tape 106 is being pulled out and stored, the pull-out arm 103 is located near P2.
At this time, the arc portion 103b at the tip of the pull-out arm 103 comes into contact with the cam portion 6a of the drive lever 6, and as a result, the drive lever 6 is forcibly moved counterclockwise (arrow direction) by a predetermined angle. It is rotated against the force of. By this operation, the cleaning arm 3 is also rotated,
During this rotating operation, the cleaning member 1 is attached to the rotary cylinder 105.
Since the protrusion 6g of the drive lever 6 and the locking portion 3d of the cleaning arm 3 are separated by the configuration in which they abut, the urging force of the spring 10 in the counterclockwise rotation direction is cleaned. It is given to the arm 3 and the cleaning member 1. That is, the cleaning member 1 is pressed by the rotating cylinder 105 by the load of the elastic body 10. At this time, the magnetic head 104 is appropriately controlled by controlling the rotary cylinder drive circuit 202 by a command of the system control unit 200 so that the rotary cylinder 105 is rotationally driven at a rotational speed lower than the rotational speed during recording and reproduction. It becomes possible to clean it. The rotation speed of the rotary cylinder 105 at this time needs to be appropriately set in consideration of the material and shape of the cleaning member 1, the pressing force of the cleaning member 1, the contact time with the magnetic head 104, and the like. When the detection switch 204 detects the completion of the tape pull-out operation and sends a completion signal to the system control unit 200, the system control unit 200 sends a rotation stop command for the motor 110 to the loading motor drive circuit 203. The rotation of 110 is stopped. This completes the magnetic head cleaning operation. At the same time, a command is sent from the system control unit 200 to the rotating cylinder drive circuit 202 to rotate the rotating speed of the rotating cylinder 105 at the rotating speed at the time of recording / reproducing, and the rotating cylinder 105 starts rotating at the rotating speed at the time of recording / reproducing. It is possible to prepare for the next operation (recording / reproducing).

[0019]

According to the present invention, the number of rotations of the rotary cylinder during the magnetic head cleaning operation can be made smaller than that during the recording / reproducing, and the magnetic head is damaged during the cleaning of the magnetic head. It is possible to provide an effective magnetic head cleaning system control method for solving problems such as wear, wear, and noise generation.

[Brief description of drawings]

FIG. 1 is a block diagram of a magnetic head cleaning system.

FIG. 2 is a state diagram of a VTR mechanism in which a magnetic tape is stored in a cassette.

FIG. 3 is a state diagram of a VTR mechanism in which a magnetic tape is drawn out of a cassette.

FIG. 4 is a plan view of the tape pull-out member in a non-operating state.

FIG. 5 is a plan view showing an operating state of the tape pull-out member.

FIG. 6 is a plan view of a main part operating state of the magnetic head cleaning mechanism.

FIG. 7 is a cross-sectional view of a cleaning member.

FIG. 8 is a plan view showing an operating state of the magnetic head cleaning mechanism.

FIG. 9 is a plan view of the magnetic head cleaning mechanism in a non-operating state.

FIG. 10 is a side view of a main part operating state of the magnetic head cleaning mechanism.

FIG. 11 is an exploded perspective view of a main part of the magnetic head cleaning mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cleaning member, 104 ... Magnetic head, 110 ... Loading motor, 105 ... Rotation cylinder, 200 ... System control part, 202 ... Rotation cylinder drive circuit, 203 ... Loading motor drive circuit.

Claims (1)

[Claims] 1. A magnetic tape is wound around a rotary cylinder having a magnetic head on the outer periphery thereof at a predetermined angle for magnetic recording and reproduction, and a cleaning member is brought into contact with the outer peripheral portion of the rotary cylinder. In a magnetic recording / reproducing apparatus equipped with a magnetic head cleaning mechanism for cleaning a magnetic head, the number of rotations of a rotary cylinder during a magnetic head cleaning operation by the magnetic head cleaning mechanism is smaller than the number of rotations during recording / reproduction. Method for controlling magnetic head cleaning system of magnetic recording / reproducing apparatus.