JPS59142722A - Cleaning device for recording or reproducing head - Google Patents

Abstract

PURPOSE:To improve cleaning efficiency by rotating a member which is provided with a cleaning material in the direction opposite to that in recording or reproduction. CONSTITUTION:An operator places a changeover switch 9 on sides (a) and (a') when loading a recording sheet which is not provided with the cleaning material in an incorporated cassette recording or reproducing deivce body. Then, the output voltage of a constant voltage source 8 is supplied to a control circuit 10 with the 1st polarity, rotating a motor 2 normally at a constant speed. The operator places the changeover switch 9 on sides (b) and (b') when loading a cassette which incorporates the dedicated cleaning sheet. Then, the output voltage of the constant voltage source 8 is supplied to the control circuit 10 with the 2nd polarity and the motor 2 is reversed at the same rotating speed as above unless a resistance R is present. Then, a head 3 is cleaned by the cleaning material provided to the dedicated cleaning sheet ST and in relative motion with the cleaning material in the direction opposite to the accumulation direction of dust on the head 3 because the rotating direction is opposite to that of the recording sheet, so the dust is removed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cleaning device for a recording or reproducing head in a recording or reproducing apparatus using a rotating recording medium, and an object of the present invention is to provide a means for cleaning efficiently and reliably. do.

Prior Art In a device that records or reproduces information using a recording medium such as a rotating magnetic sheet, if the part of the recording or reproducing head (hereinafter abbreviated as head) that faces the recording medium is dirty with dirt or dust. , recording or playback characteristics deteriorate. Therefore,
In order to remove such dirt, the surface of the head is cleaned using a solvent, for example.

By the way, since the head of a video signal recording or reproducing apparatus is constructed with extremely precision, the above-mentioned cleaning method is likely to cause an accident that damages the head. Furthermore, in video disk recorders and rotating magnetic sheet recorders, the heads are often installed in locations that are difficult to reach, so it is often difficult to apply the above method.

Therefore, a method is used in which a so-called cleaning disk or cleaning sheet to which a cleaning wrap material is attached is loaded and the head is cleaned by rotating the cleaning disk or sheet in the same way as during normal recording or reproduction.

However, in a recording or reproducing apparatus using a rotating recording medium, the direction of rotation of the recording medium is always determined, and therefore dirt and dirt will accumulate on the head in a determined direction. for example,
Dirt accumulates near the facing surface of the head on the upstream side of the rotation of the recording medium, and the accumulated dirt leaves a trail in the downstream direction of the rotation of the recording medium.

Even if a head with accumulated dirt is cleaned by rotating a cleaning disk or cleaning sheet in the same direction as during recording or reproduction, a sufficient cleaning effect may not always be obtained.

Purpose of the Invention Accordingly, the present invention is configured such that the recording or reproducing head is opposed to a member provided with a cleaning material, and the member provided with the cleaning material is rotated to clean the recording or reproducing head. It is an object of the present invention to provide a cleaning device that can improve cleaning efficiency in a recording or reproducing device by rotating a member provided with a cleaning material during cleaning in a direction opposite to that during recording or reproducing.

Structure of the Invention The present invention provides a recording or reproducing head configured to face a member provided with a cleaning material and cleaning the recording or reproducing head by rotating the member provided with the cleaning material. In a reproduction device; a motor for rotating the above-mentioned member, which can rotate in both forward and reverse directions (
In a specific example to be described later, for example, the sheet rotation motor 2) in FIG. The present invention is characterized by a recording or reproducing head cleaning device comprising a control means for rotating the motor 2 in two directions (switch switch 19 in FIG. 3 for supplying voltages of opposite polarity to the motor 2);

In the above, the member provided with the cleaning material refers to a cleaning sheet or a cleaning disk provided with the cleaning material on almost the entire surface, or a recording medium provided with the cleaning material at a position away from the area where recording tracks are to be formed. A recording or reproducing head refers to a recording or reproducing head such as a magnetic head, an optical head, or a capacitive head, and a recording medium refers to a recording or reproducing head such as a magnetic head, an optical head, or a capacitive head. It refers to a recording medium on which information is recorded or reproduced, and its form may be either sheet-like or disk-like, and the recording tracks formed on the recording medium may be either concentric or spiral.

Moreover, the citation of the specific examples described later in the above does not limit the scope of the present invention in any way, and the present invention can be modified as appropriate within the scope of the claims.

With reference to the drawings, the configuration of a cassette applied to the first embodiment of the present invention, the second and third embodiments of the present invention,
A second embodiment of the present invention, a third embodiment, and the order of loading and unloading a cassette and detecting a notch will be explained in detail. The following description will be made with reference to an example in which the recording or reproducing head is a magnetic head and the recording medium is a rotating magnetic sheet.

First Embodiment of the Invention (Fig. 1) In embodying the cleaning device of the invention, both the member provided with the cleaning material and the recording medium not provided with the cleaning material are housed in a cassette. It is allowed that In the embodiment shown in FIG. 1, the operator identifies a cassette containing a dedicated cleaning sheet and a cassette containing a recording medium without cleaning material, for example, by the display on the cassette surface, and loads either of them. This is an example in which the motors are rotated in opposite directions depending on the direction.

In FIG. 1, ST indicates a dedicated cleaning sheet or a recording sheet on which no cleaning material is provided, and this dedicated cleaning sheet is provided with a cleaning wrap material over almost the entire surface (back surface in the figure). 2 is a seat rotation motor; 3 is a head (magnetic head);
is fixed to the head carrier 3a. 4 is a step motor that controls the movement of the head 3 between tracks; 5 is a mechanism that converts the rotation of the step motor 4 into linear motion; the figure shows a screw; this screw is pivotally supported by the step motor 4; , are screw-fitted with the head carrier 3a. The head carrier 3a is further fitted into a guide rod (not shown) fixed to the chassis of the apparatus. 8
are constant voltage sources for the motor 2, and their output voltages are supplied to the control circuit 10 via the changeover switch 9 with opposite polarities. When the changeover switch 9 is switched to the terminals a and a', it supplies the output voltage of the constant voltage source 8 with the first polarity to the control circuit 10, and when it is switched to the terminals b and b', it supplies the output voltage of the constant voltage source 8 to the control circuit 10. 8 is supplied to the control circuit 10 via a resistor R with a polarity opposite to the first polarity.

When the control circuit 10 is supplied with the first polarity voltage from the constant voltage source 8, the control circuit 10 controls the motor drive circuit 11 to rotate the motor 2, for example, in the forward direction, thereby causing the motor 2 to rotate in the forward direction, Further, when a voltage of the second polarity is supplied from the constant voltage source 8, the motor drive circuit 11 is controlled to rotate the motor 2, for example, in the opposite direction, thereby causing the motor 2 to rotate in the reverse direction. Note that the effect of the resistor R will be described later.

In FIG. 1, 12 is a speed/voltage converter that converts the rotational speed of the motor 2 into voltage; a control circuit 10 and a motor drive circuit 11.
Together, they constitute a servo system that controls the rotational speed of the motor 2. 13 is a step motor drive circuit.

To explain the operation of the device shown in FIG. 1, when an operator loads a cassette containing a recording sheet without cleaning material into the main body of the recording or reproducing device, the operator sets the selector switch 9 to the a or a' side. Switch. Then, the output voltage of the constant voltage source 8 is supplied with the first polarity to the control circuit 10, and the motor 2 is rotated forward at a constant speed by the action of the servo system.

On the other hand, the step motor 4 is controlled by the step motor drive circuit 13 to transport the head 3 in the radial direction of the recording sheet ST via the mechanism section 5 and the head carrier 3a. As a result, a signal is recorded on the recording sheet ST by the head 3, or a recorded signal is read by the head 3.

On the other hand, when the operator loads a cassette containing a dedicated cleaning sheet, the selector switch 9 is pressed between b and b'.
Switch to the side. Then, the output voltage of the constant voltage source 8 is supplied to the control circuit 10 with the second polarity, and if there is no resistance R, the motor 2 is rotated in reverse at the same rotation speed as the former.

The head 3 is cleaned by the cleaning material provided on the dedicated cleaning sheet ST, and since the rotating direction is opposite to that of the recording sheet, the cleaning material is applied in the opposite direction to the aforementioned dirt accumulation direction on the head 3. Due to the relative movement, dirt can be removed efficiently.

If a resistor R exists, the control circuit 10
Since the input voltage of the second polarity to motor 2
When rotating in reverse, it rotates at a slower speed than when rotating normally, and the speed of relative movement between the cleaning material and the head is also lower than when relative movement between the recording sheet and the head. The effects of this are as follows.

In other words, in a recording or reproducing device that handles video signals, the relative speed between the recording medium and the head is very high, so there is an air layer between the recording medium and the head.
) is formed, and the presence of this air layer causes a problem in that it becomes difficult to remove dirt from the head surface.

To explain the relative motion between the head and the seat, generally speaking, the thickness of the air layer during the relative motion between the two is determined by the shape of the head, the viscosity of the air, the rigidity of the seat, and the relative speed between the two. If the relative velocity is reduced, the thickness of the air layer will be reduced. For example, if the thickness of the air layer is h and the relative velocity is v, then h=c・v^n(n>1,
c is a constant). therefore,
By slowing down this relative speed and allowing the head and cleaning material to move relative to each other in a state where they are almost in contact with each other, it is possible to efficiently remove dirt from the head surface. As for how slow the relative speed should be, this relative speed is the relative speed between the head and the part where the cleaning material is provided, so for the rotating sheet, its circumferential speed, and therefore its rotational angular velocity and diameter. and the various factors mentioned above, it will vary depending on the design of the device and is not limited to any particular critical value. However, according to the inventor's experiments, the distance between the head and the sheet during recording or reproduction, that is, the thickness of the above-mentioned air layer, is about 250 nm, but in the above-mentioned cleaning mode of this invention, the distance is reduced to 1/1. It is possible to set it to 2 or less. Needless to say, it is necessary to avoid the two being so close together that the cleaning material may damage the surface of the head. Therefore, when the cleaning efficiency is reduced due to the presence of the above-mentioned air layer, when the motor 2 is rotated in reverse during cleaning, the rotational speed can be lowered than when rotating in the normal direction. Note that when the relative movement between the cleaning material and the head continues for a predetermined period of time, it is possible to stop this movement.
When the switch is switched to the b' side, a timer is operated in conjunction with this, and the control circuit 10 is cut off by its output.

Structure of a cassette applied to the second and third embodiments of the present invention (Fig. 2) The second and third embodiments of the present invention are constructed of a member provided with a cleaning material (a dedicated cleaning sheet or A means for distinguishing between a cassette containing a cleaning disk (or a sheet or disk on which a cleaning material is provided at a position outside the area where a recording track is to be formed) and a cassette containing a recording sheet without a cleaning material. When the former cassette is loaded, the relative movement between the cleaning material and the head is automatically reversed from that during recording or reproduction.

Note that in order to provide the cleaning material at a position away from the area where the recording track is to be formed, it is possible to attach a cleaning wrap material to the outside of the recording track. Hereinafter, in this specification, a portion of the recording medium to which a cleaning wrap material is attached will be referred to as a cleaning track.

FIG. 2 shows the configuration of the above-mentioned identification means using a cassette containing sheets as an example, and FIG.
B) shows a cassette of parts provided with cleaning material.

Of course, both may be configured in reverse, but the following description will be made with respect to the illustrated example. In the same figure (A), 1 indicates a cassette containing a sheet (for example, a magnetic sheet) that is not provided with a cleaning material, and in the same figure (B), 1' is a dedicated cleaning sheet or cleaning track provided with a cleaning material. 1 shows a cassette containing a sheet (for example, a magnetic sheet) having a magnetic field.

1a and 1'a are dustproof shutters that can be opened and closed for the head insertion opening, and 1b and 1'b are track display counters. The difference between the two is that the cassette 1' that houses the sheet in which the cleaning material is provided has a notch 1' in its housing.
The housing of the cassette 1, which houses the sheet provided with the cleaning material c and the other sheet without the cleaning material, is not provided with a notch.

The main body of the recording or reproducing device has a detection system that distinguishes between cassettes containing a sheet provided with a cleaning material and cassettes containing a sheet not provided with the cleaning material, based on the presence or absence of the above-mentioned notch in the cassette loaded therein. Means, for example mechanical detection means, are provided. This detection means will be described later. Various other modifications can be considered to the structure of the cassette for identifying both cassettes. For example, instead of the above-mentioned notch 1'c, a through hole may be provided at a predetermined position in the cassette containing the sheet provided with the cleaning material, and the presence or absence of this through hole may be detected with a photocoupler; A magnetic body may be attached to a predetermined position on a cassette containing a sheet provided with a cleaning material, and the presence or absence of this magnetic body may be detected by a magnetic sensing element. Through each of these means, an identification means such as a notch, a through hole, or a magnetic material may be provided on a cassette containing a sheet not provided with a cleaning material, contrary to the above.

Second Embodiment of the Invention (FIG. 3) The identification means shown in FIGS. A specific example will be shown in which, when it is detected that a cassette provided with a cassette is loaded, the sheet contained in the cassette is rotated in the opposite direction to that during recording or reproduction. In these specific examples, the member built into the cassette is a sheet, and the presence or absence of cleaning material is detected by the presence or absence of the notch. It is clear from the above description and the following description that the present invention can be similarly applied to the case where an identification means is used.

Fig. 3 shows that the sheet contained in the cassette 1' of Fig. 2 (B) is a dedicated cleaning sheet, and that this cassette 1' and the sheet shown in Fig. 2 (A) without cleaning material are used. This is an example of identifying the built-in cassette 1.

In the figure, parts indicated by the same reference numerals as in FIG. 1 basically have the same configuration and function. Regarding other parts, 18
is a constant voltage source, with negative voltage (-V_1) and positive voltage (
+V_2) is output, and a negative voltage (
-V_1) is supplied to the control circuit 10, the motor 2 is rotated in the reverse direction, and when a positive voltage (+V_2) is supplied to the control circuit 10, the motor 2 is rotated in the forward direction.

The selector switch 19 is connected to the cassette (1, 1' in Fig. 2).
) When a cassette 1' having a notch 1'c is loaded, a negative voltage (-V_
1), and when the cassette 1 without a notch is loaded, the positive voltage (+V_2) is selected and the control circuit 10
configured to supply For this purpose, terminals 19a receiving voltages (-V_1) and (+V_2), respectively;
19b and a movable contact piece 19c are provided, and the detection pin 19d is not pushed when neither cassette 1 or 1' is loaded, or because there is a notch 1'c when cassette 1' is loaded. Since the detection pin 19d is not pushed, the movable contact piece 19c contacts the terminal 19a due to its own elasticity.On the other hand, when the cassette 1 is loaded, since there is no notch, the detection pin 19d touches the cassette 1. The movable contact piece 19c is pushed by the terminal 19b against its own elasticity.
can be configured to make contact with

Next, to explain the operation of the device shown in Fig. 3, when the cassette 1' containing a dedicated cleaning sheet is loaded,
Due to the presence of the notch 1'c, the contact piece 19c of the switch 19 remains in contact with the terminal 19a, so a negative voltage (-V_1) is supplied from the constant voltage source 18 to the control circuit 10, and the motor 2 The sheet ST (cleaning sheet in this case) is rotated in the opposite direction to that during recording or reproduction. Therefore, cleaning is performed by the head 3 moving relative to the cleaning material provided over almost the entire back surface of the sheet ST in the figure. In this case, if the head 3 is located at a position facing the part on the surface of the sheet ST where the cleaning material is provided, the purpose of cleaning can be achieved, but considering the rotational speed of the sheet ST determined by the voltage V_1, the head 3
If it is possible to control the position of the head 3 so that cleaning is performed most efficiently, or if the position of the head 3 during cleaning is regulated by other conditions, the voltage V_1 is set so as to satisfy the above conditions. It is possible to select. In particular, as explained in connection with the embodiment shown in FIG. 1, when an air layer is formed due to the high speed rotation of the sheet ST and the cleaning effect is therefore insufficient, |V_1|<|V_2|
As a result, it is possible to reduce the rotational speed of the sheet ST relative to the head 3 to an appropriate speed.

On the other hand, when the cassette 1 is loaded, the detection pin 19d of the switch 19 is pushed by a part of its housing, and its contact piece 19c comes into contact with the terminal 19b, so that a positive voltage (+V_2) is applied from the constant voltage source 18. The signal is supplied to the control circuit 10, and the motor 2 rotates the sheet ST (in this case, a recording sheet without cleaning material) in the forward direction for recording or reproduction. Then, the position control of the head 3 with respect to the sheet ST and the recording or reproduction of signals by the head 3 are performed in a known manner.

In the cleaning mode, when the relative movement between the head 3 and the sheet ST continues for a predetermined time, it is possible to stop this relative movement. It is possible to configure the control circuit 10 to stop operating when a predetermined period of time has elapsed after the start of supply of the negative voltage (-V_1).

Third Embodiment of the Invention (FIG. 4) FIG. 4 shows that the sheets contained in the cassette 1' of FIG. 2(B) are placed on a cleaning track (indicated by Tc in FIG. 4).

), and this cassette 1' and the second cassette
This is an example of identifying the cassette 1 shown in FIG. 1A that contains a recording sheet without cleaning material. In FIG. 4, parts given the same reference numerals as in FIG. 3 basically have the same configuration and function. Regarding other parts, 6A
includes a switch S1 which is a cassette loading and unloading signal source that generates a signal indicating loading and unloading of the cassettes 1 and 1', and is activated when loading and unloading the cassettes 1 and 1'. 6B is loaded cassette 1, 1'
A notch detection signal source for identifying the presence or absence of a notch 1'c in a cassette 1, and generating a signal indicating the fact;
A switch S that responds to the presence or absence of a notch 1'c in 1'
Contains 2. Signals generated by signal sources 6A and 6B are sent to system control section 7. S3 and S4 are position sensors that operate in accordance with the movement of the head carrier 3a when the head 3 reaches the position one track past the last track on the sheet ST and the position of the cleaning track Tc, respectively; This detection signal is also sent to the system control section 7.

7 is a system control unit, which includes a cassette loading and unloading signal source 6A, a cassette notch detection signal source 6B, and a sensor S3.
A signal from the sensor S4 is also input to control the operations of other parts of the device.

The constant voltage source 18' supplies a negative voltage (-
The motor 2 outputs a positive voltage (+V_1) and a positive voltage (+V_2), and the positive voltage (+V_2) causes the motor 2 to rotate in the positive direction during recording or reproduction, and the negative voltage (-V_1) causes the motor 2 to rotate in the reverse direction during cleaning. The switch circuit 19' is an electronic switch circuit controlled by the system control unit 7 and selects the voltage (-V_1) or (+V_2).

Next, the operation of the apparatus shown in FIG. 4 will be explained. When the recording or reproducing operation progresses and the head 3 finishes recording or reproducing at the final recording track position of the sheet ST and is further advanced by one track, the sensor S3 is activated and the motor is driven by a command from the system control unit 7. The circuit 11 stops the rotation of the motor 2, and the step motor drive circuit 13 also temporarily stops the operation of the step motor 4. Then cassette 1 or 1'
is removed from the cassette storage unit (22 in FIG. 5), the system control unit 7 responds to the cassette removal signal generated by the cassette loading/unloading signal source 6A.
The step motor drive circuit 13 reversely rotates the step motor 4 via Stop at that position.

In this state, the sheet S having the cleaning track Tc
When a cassette 1' containing a T is loaded, a cassette loading signal is generated by the cassette loading/unloading signal source 6A and a signal generated by the cassette notch detection signal source 6B. The switch circuit 19' is set to the negative voltage (-V_1) side, so that the control circuit 10 and the motor drive circuit 11 rotate the motor 2 in the opposite direction for a certain period of time or at a certain number of rotations, and the step motor drive circuit 13 causes the step motor drive circuit 13 to Leave motor 4 inactive. Therefore, the head 3 rotates the sheet ST in the opposite direction to that during recording or reproducing, and as described above, the dirt is efficiently removed by relative movement with the cleaning material attached to the cleaning track Tc. The voltage V
_1 is selected to a value that allows the relative movement between the head 3 and the cleaning material on the sheet ST to be performed most efficiently at the position of the cleaning track. In particular, as in the apparatus shown in FIG. 3, when an air layer is formed due to the high speed rotation of the sheet ST and the cleaning effect is therefore insufficient, |V_1|<|V_2
|, it is possible to reduce the rotational speed of the sheet ST relative to the head 3 to an appropriate speed.

When the rotation of the motor 2 for a certain period of time or a certain number of revolutions is completed, the step motor drive circuit 13 rotates the step motor 4 in the forward direction, the head 3 moves to a position corresponding to the first recording track of the sheet ST, and the sensor S4 Since it is inactive, the switch circuit 19' is set to the positive voltage (+V_2) side via the system control unit 7, and the motor 2 rotates in the positive direction during recording or reproduction. Note that the head 3 may be returned to the position corresponding to the cleaning track Tc by a signal from the sensor S3 or a detection signal from the signal source 6B instead of the cassette ejection signal from the signal source 6A. Also sensor S
The motor 2 is stopped by the operation of 3 and the motor 2 is stopped by the cassette loading signal from the cassette loading and unloading signal source 6A.
The restart may be performed by controlling the constant voltage source 18'.

On the other hand, when a cassette 1 containing a built-in sheet ST without a cleaning track is loaded, the system detects a The step motor drive circuit 13 rotates the step motor 4 in the forward direction via the control section 7 to move the head 3 to the first recording track position. Note that the signal source 6B may be configured to generate a signal on one side and not generate a signal on the other side in response to the loading of a sheet with a cleaning track and a sheet without a cleaning track, thereby identifying the two. good.

When the sensor S4 becomes inactive due to the movement of the head 3, the switch circuit 19'
is set to the positive voltage (+V_2) side, and also controls the control circuit 10, thereby causing the motor drive circuit 11 to drive the motor 2.
Rotate in the forward direction. Thereafter, in this state, the recording or reproducing switch is operated to operate the recording or reproducing circuit, and the track designation switch is operated to move the head 3 to a desired track to record a signal or reproduce the recorded signal. .

Cassette loading and unloading and notch detection (Figure 5) Cassette loading and unloading signal source 6 in the device shown in Figure 4
The switch S1 included in A and the switch S2 included in the cassette notch detection signal source 6B can also be applied to the apparatus shown in FIG. FIG. 5 shows an example of these switches and related devices, where 21 is the main body of the recording or reproducing device, 22 is a cassette storage section, and 1 or 1' is a cassette containing the sheet ST in FIG. 3 or 4. The cassette 1 or 1' is loaded into the cassette storage section 22 in the direction of the arrow in the figure. The switch S1 has contact pieces attached to the upper and lower walls of the cassette storage space 22c of the cassette storage section 22, and is configured such that both contact pieces are opened when the cassette 1 or 1' is loaded, and closed when the cassette 1 or 1' is taken out. In addition, the switch S2 is provided in a recess in the cassette storage section 22, and when the cassette 1 or 1' is loaded, the switch S2 is opened in the notch 1'c depending on the presence or absence of the notch 1'c in a part of the housing.
If there is no notch 1'c (cassette 1), one contact piece is pressed by the underside and both contact pieces are closed, and if there is a notch 1'c (cassette 1'), both contact pieces remain open. It is structured so that there is. In addition, in FIG. 5, the position of the switch S1 is shown near the center of the cassette storage space 22c to simplify the illustration, but the cassette 1 or 1' is completely located in the storage space 2.
In order for the switch S1 to operate when the cassette 2 is loaded, the switch must be placed near the boundary between the spring storage space 22b and the cassette storage space 22c in FIG. It is possible to set it up.

In FIG. 5, 23 indicates the main body 21 and the cassette storage section 22.
It is a shaft that connects the branch section 22 of the cassette storage section 22.
A spring 33 is applied between a and the main body 21, and the cassette storage section 22 is given a counterclockwise rotational force about the shaft 23 by the biasing force of the spring 33. This rotation is caused by the pin 34. limited by. 24 is a spring and is stored in the spring storage space 22b of the cassette storage section 22, but the space 22b is larger in vertical dimension than the space 22c, and even if the spring 24 is expanded, its movement is limited to the space 22b.
limited within.

Reference numeral 25 denotes a locking pin provided on the cassette storage portion 22, which when the storage portion 22 is closed to the main body 21, engages the hook portion of a storage portion locking lever (not shown) provided on the main body 21. engage with.

Reference numeral 27 denotes a shaft implanted in the cassette storage section 22, which rotatably supports the cassette locking lever 28 and the stop lever 30. The levers 28 and 30 are biased into an integral configuration by a spring 32, but since a pin 29 is implanted in the lever 28 as shown, the levers 28 and 30 are normally attached to each other with a slight opening angle. Rotate.

A spring 31 is applied between the cassette locking lever 28 and the downward protrusion 22e of the cassette storage portion 22, and the spring 31 applies a counterclockwise rotational force to the levers 28 and 30 about the shaft 27. This rotation is regulated by a pin (not shown) provided in the front side of the paper of the cassette storage section 22, and the relationship between the cassette locking portion 28a of the lever 28 and the cassette is controlled by the insertion and removal of the cassette 1 or 1', which will be described later. and to enable the locking to be carried out without any trouble.

The other end 28b of the lever 28 is connected to the cassette 1 or 1', which will be described later.
It is formed so as to come into contact with a cam portion (not shown) of the eject lever 36 during the ejection operation. In the figure, 21a indicates a stop portion of the main body 21, and 30a indicates a tip end of the stop lever 30.

To explain the operation of the cassette loading and unloading device shown in FIG. Even if you try to close it, the tip 30a of the stop lever and the contact part 21a of the main body will come into contact with each other,
The cassette storage section 22 cannot be closed.

On the contrary, cassette 1 or 1' is pushed further,
When the left end reaches the position indicated by the dashed line x-x in the spring storage space 22b, the locking lever 28 is rotated counterclockwise by the spring 31, and the locking portion 28a engages the cassette 1 or 1'.
The right end of the spring 24 is locked, and the spring 24 is energized. At this time, the stop lever 30 also rotates counterclockwise, so its tip 30a no longer comes into contact with the stop part 21a of the main body, the cassette storage section 22 is closed with respect to the main body 21, and the locking pin 25 is rotated counterclockwise. It is locked by the hook portion of the above-mentioned storage section locking lever No. 21. In this state, switch S1 is opened, switch S2 is opened or closed depending on the presence or absence of notch 1'c,
The operations described above are performed.

To remove the cassette 1 or 1', push the operation button 36a of the eject lever to the left in the figure, and the locking pin 25
The engagement with the hook portion of the aforementioned storage section locking lever is released, and the cassette storage section 22 is rotated counterclockwise by the spring 33, and at the same time, one end 28b of the locking lever is attached to the eject lever 36. is pushed by the cam part (not shown)
The locking lever 28 rotates clockwise and the cassette 1 or 1' is unlocked by its tip 28a, so that at least the left end of the cassette 1 or 1' is separated from the space 22b by the bias of the spring 24. It protrudes from the loading port 22d until it reaches the boundary with the loading port 22c. Further, when the cassette 1 or 1' is pulled out, the switch S1 is closed, and the switch S2, which was closed when the cassette 1 was loaded, is also opened, and the above-mentioned operations associated with taking out the cassette are performed. As the cassette storage section 22 rotates, the stop lever 30 also attempts to rotate clockwise, but its rotation is restricted by the stop portion 21a of the main body, and moves upward while contacting the stop portion 21a.

In FIG. 5, the switch S1 is opened when the cassette 1 or 1' is loaded, but it may be closed when the cassette is loaded, and the switch S2 also has a notch 1'c for inserting the cassette 1'. It may be closed at times.

In short, the activation or deactivation of switch S1 when loading or unloading cassette 1 or 1', and the
The above-mentioned operations are carried out depending on whether the switch S2 is activated or deactivated depending on the presence or absence of the notches at the openings 1 and 1'.

Although the example in which the recording medium and the dedicated cleaning member are rotating sheets has been described above, the present invention can be similarly applied to the case where these are rotating disks.

Effects of the Invention The present invention provides a recording or reproducing head configured to face a member provided with a cleaning material and cleaning the recording or reproducing head by rotating the member provided with the cleaning material. In the playback device, the motor for rotating the above-mentioned member is rotated in a direction opposite to that during recording or playback during cleaning, so that the recording medium does not rotate in a fixed direction with respect to the recording or playback head during recording or playback. This makes it possible to efficiently remove dust and dirt, which tends to accumulate in one direction on the recording or reproducing head.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of a recording or reproducing head cleaning device according to the present invention, and FIG. 2(A) is a cleaning material applied to the second and third embodiments of the present invention. 2(B) is a perspective view showing an example of a cassette containing a recording medium not provided with a cleaning material, FIG. 3(B) is a perspective view showing an example of a cassette containing a member provided with a cleaning material, 4
The figures are block diagrams of second and third embodiments of the recording or reproducing head cleaning device according to the present invention, respectively, and FIG. 5 is a cross-section of the cassette loading and unloading and cassette notch detection device applied to the present invention It is a diagram. In the figure, 1 and 1' are a cassette, 1'c is a notch provided in the cassette 1', 2 is a sheet rotation motor, 3 is a recording or reproducing head, 4 is a step motor, 6A is a cassette loading and unloading signal source, 6B is a cassette notch detection signal source; 7
is a system control unit, 8, 18, 18' are constant voltage sources, 9,
19 is a changeover switch, 10 is a control circuit, 11 is a motor drive circuit, 13 is a step motor drive circuit, 19' is a switch circuit, ST is a seat, Tc is a cleaning track, S1, S2 are switches, S3, S4 are position sensors shows.

Claims (5)

[Claims] (1) In a recording or reproducing apparatus configured such that the recording or reproducing head is opposed to a member provided with a cleaning material and the member provided with the cleaning material is rotated to clean the recording or reproducing head, the above-mentioned a motor for rotating a member that can rotate in both forward and reverse directions; and a motor that rotates the motor in a first direction during recording or reproduction;
A cleaning device for a recording or reproducing head, further comprising: control means for rotating the motor in a second direction that is opposite to the first direction during cleaning. (2) The recording or reproducing head cleaning device according to claim (1), wherein the control means is a changeover switch configured to supply voltages of opposite polarity to the motor. (3) The control means includes a detection means for identifying that the member provided with the cleaning material is loaded, and the detection means detects that the member provided with the cleaning material is loaded. A cleaning device for a recording or reproducing head according to claim 1, wherein the motor is rotated in the opposite direction only when the motor is rotated in the opposite direction. (4) The recording or reproducing head according to claim (3), wherein the member provided with the cleaning material is housed in a cassette, and the detecting means identifies that the cassette is loaded. Cleaning equipment. (5) Identification means for identifying one of the cassette containing the member provided with the cleaning material and the cassette containing the recording medium not provided with the cleaning material is set, and the detection means A cleaning device for a recording or reproducing head according to claim 4, wherein the means identifies whether the cassette containing the member provided with the cleaning material is loaded based on the presence or absence of the identification means.