JPH09305936A - Rotating head type playback device - Google Patents

Abstract

(57) Abstract: A magnetic head can be cleaned while viewing a reproduced image during reproduction of a magnetic tape. SOLUTION: When a pinch roller 24 attached to one end 26 of a pinch roller arm 28 presses against a capstan 23, the other end 29 of the pinch roller arm 28 abuts an arm 30 fixed to a switch shaft 9, Thirty
Hold down. As a result, the arm 31 fixed to the switch shaft 9 is biased downward. At that time, the cleaner switch 8 is pressed, and the switch shaft 9 is interlocked with it.
Is driven to slide. The other end 32 of the arm 31 fixed to the switch shaft 9 is connected to the one end 10 of the cleaner arm 12.
Abut. The cleaner arm 12 rotates around the fulcrum 11. The head cleaner 14 rotatably attached to the other end 13 of the cleaner arm 12 is pressed against the magnetic head to clean the head clog.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head type reproducing apparatus capable of easily removing clogging of a magnetic head.

[0002]

2. Description of the Related Art Conventionally, a rotary head type reproducing apparatus, for example, a V type magnetic head mounted on a rotary drum and having a magnetic tape wound around a peripheral surface of the rotary drum so that the magnetic head runs.
In TR (video tape recorder), a method of controlling a head cleaner using a function cam for controlling loading / unloading of a tape cassette is known.

That is, the function cam is driven to rotate, and the function cam is formed with a plurality of grooves corresponding to a predetermined rotation angle and radius of the cam. The pin engaged with the groove and the pin are integrated with the pin. The mechanical part is controlled by the movable member. Thereby, various operations at the time of loading / unloading the tape cassette,
Various operation modes such as reel drive, brake for the reel, and head cleaning according to the tape running mode are realized corresponding to the rotation angle of the function cam.

In such a conventional structure, the head cleaner hits the magnetic head only once during loading of the inserted magnetic tape. This is to prevent the magnetic powder from the magnetic tape from accumulating in the magnetic head.

[0005]

However, in this method, since the loading operation is performed and the head cleaning operation is performed, the wear of the magnetic head caused by the head cleaning must be taken into consideration. Therefore, there is a problem that a material having a strong polishing power cannot be used for the head cleaner. Therefore, once the magnetic head is clogged (head clog),
There was a problem that the clogging could not be removed no matter how many times it was loaded.

Therefore, an object of the present invention is to provide a rotary head type reproducing apparatus having a head cleaner mechanism capable of cleaning only when a head clog occurs.

[0007]

According to a first aspect of the present invention, there is provided a rotary head type reproducing apparatus in which a magnetic head is attached to a rotary drum, and a magnetic tape is wound around a peripheral surface of the rotary drum so as to run. , A switch shaft that slides when head cleaning is turned on and off, and a first shaft fixed by using the switch shaft as a support shaft.
And a second arm, a spring provided at one end of the second arm for biasing the switch shaft in one rotation direction, and a third pinch roller rotatably attached.
, The fourth arm to which the cleaner is rotatably attached, and the pinch roller is not crimped to the capstan When not crimped, the biased second arm and fourth arm do not come into contact with each other. When the head cleaning is not performed and the pinch roller is pressed against the capstan, the third arm contacts the first arm and the switch shaft rotates through the first arm. The rotary head reproducing apparatus is characterized in that head rotation is performed by bringing the second arm and the fourth arm into contact with each other by rotation.

As described above, according to the present invention, only when the pinch roller is pressure-bonded to the capstan, that is, only when reproducing, the magnetic head disposed arbitrarily on the rotating drum while observing the reproduced image is used. The clogging can be cleaned.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a reference structure for explaining an embodiment of the present invention. 1, a rotary head type reproducing device, for example, a VT
R is controlled by the microcomputer 2. Switch 3
Informs the microcomputer 2 whether or not the magnetic head is being cleaned. The mechanical deck section 4 includes holes 6a and 6b into which guides and the like are inserted, a rotary drum 5, a head cleaner 14, and an arm 12 on which the head cleaner 14 is arranged. Also, front panel 7
When the cleaner switch 8 attached to is pressed, the switch shaft 9 is slidably arranged so as to slide.

An example of the operation of cleaning the magnetic head will be described using the VTR shown in FIG. The cleaner switch 8 is pressed, and the switch shaft 9 slides in conjunction with the pressed cleaner switch 8. One end 10 of the cleaner arm 12 is pressed by the sliding of the switch shaft 9 (arrow a). Then, the cleaner arm 12 rotates around the fulcrum 11.

A head cleaner 14 is provided at the other end 13 of the cleaner arm 12,
The head cleaner 14 is pressed against the rotating drum 5 by rotating (arrow b). As a result, the clogging (clog) of the magnetic head arranged on the rotary drum 5 is cleaned. Further, while the cleaner switch 8 is being pressed, the switch 3 is interlocked and turned on to ground a predetermined terminal of the microcomputer 2 to inform the microcomputer 2 that the head clog is being cleaned.

In the head cleaning structure shown in FIG. 1, the cleaning operation is always performed when the cleaner switch 8 is pressed. For this reason, cleaning may be performed even if it is mischievous or unnecessary. Therefore, in the present invention, cleaning is performed while viewing the reproduced image only during reproduction. An embodiment of the present invention is shown in FIG.

As shown in FIG. 2, the front panel 7 has a cassette insertion opening 2 for inserting a tape cassette.
1 and a hole 22 for attaching the cleaner switch 8
And are provided. Arms 30 and 31 are fixed to each other with the switch shaft 9 as a support shaft. One end 3 of the arm 31
A small hole for locking the spring is provided in the spring 3, and a spring 34 is provided between the small hole and the mechanical deck section 4. The spring 34 is provided to bias the switch shaft 9 in one direction.

A shaft 25 of the pinch roller 24 is rotatably attached to one end 26 of a pinch roller arm 28. The pinch roller arm 28 rotates around the fulcrum 27. As described above, the shaft 35 of the head cleaner 14 is rotatably attached to the other end 13 of the cleaner arm 12. This cleaner arm 12 has a fulcrum 1
Rotate around 1.

An example of the cleaning operation shown in FIG. 2 will be described below. When the reproduced image is viewed during reproduction and it is determined that cleaning is required, the cleaner switch 8 is pressed, and the head clog is cleaned while observing the reproduced image. In this way, when cleaning the head clogs, in this embodiment, the cleaning is performed after the following steps.

The tape cassette is inserted into the cassette insertion opening 21 of the VTR 1, the magnetic tape pulled out from the supply reel of the tape cassette is guided by a plurality of loading guides, and an erasing head and a CTL head (control) are provided on this tape path. The signal recording / reproducing head) is contacted with the magnetic head, and is wound around the rotary drum 5 provided with the magnetic head at a predetermined winding angle, for example, 272 ° around the entire circumference of the rotary drum 5.

The magnetic tape wound around the rotary drum 5 is again guided by a plurality of loading guides, is brought into contact with the time code recording head on the tape path, and is taken up via the pinch roller 24 and the shaft 23. To be wound up.

In this way, when the loading is performed, the reproduction switch is pressed, the reproduction state is reached, and the pinch roller 24 is pressed against the shaft 23, one end 26 of the pinch roller arm 28 rotates about the fulcrum 27. Move (arrow c). That is, the other end 29 of the rotated pinch roller arm 28 also rotates (arrow d).

At this time, the other end 29 of the pinch roller arm 28 contacts the arm 30. That is, the arm 30 is pressed downward by the other end 29. As a result, the switch shaft 9 to which the arm 30 is fixed rotates (arrow e). Similarly, switch shaft 9
The arm 31 fixed to the arm rotates in the same direction (arrow f). When the cleaner switch 8 is pressed,
In conjunction with the cleaner switch 8, the switch shaft 9
Slide (arrow g). When the switch shaft 9 slides, the arm 31 fixed to the switch shaft 9 also slides (arrow h).

When the arm 31 slides, the other end 32 of the arm 31 comes into contact with the one end 10 of the cleaner arm 12, and the cleaner arm 12 rotates about the fulcrum 11 (arrow a). Similarly, cleaner arm 1
The other end 13 of 2 also rotates (arrow b). The head cleaner 14 rotatably attached to the other end 13 of the rotated cleaner arm 12 is pressed against the magnetic head arranged on the rotary drum 5. That is, the head clog is cleaned.

Next, when the pinch roller 24 is not pressure-bonded to the shaft 23 in the non-pressure-bonded state, the other end 29 of the pinch roller arm 28 does not press the arm 30. Therefore, the switch shaft 9 to which the arm 30 is fixed is rotated in the direction opposite to the arrows e and h by the elastic force of the spring 34 connected to the one end 33 of the arm 31. In this state, even if the cleaner switch 8 is pressed and the switch shaft 9 slides, the other end 32 of the arm 31 does not contact the cleaner arm 12.

[0022]

According to the present invention, since it can be used only when the magnetic head of a reproducing apparatus using a magnetic tape as a recording medium causes a clogging, a cleaner having a strong polishing force which has never been used is used. can do.

Further, according to the present invention, since the clogging of the magnetic head can be cleaned only during reproduction, the cleaning can be carried out while observing the image.
Further, unnecessary head wear due to mischief or the like can be prevented.

Further, according to the present invention, since the cleaner can be controlled so as not to hit the magnetic head by moving the mechanical position with the microcomputer, even if the cleaning switch is continuously pressed, a time-out is a safety function. Can be set. At this time, the mechanical cam
Only the head cleaning mechanism portion can be additionally attached without requiring a position or the like.

[Brief description of drawings]

FIG. 1 is a reference example for explaining the present invention.

FIG. 2 is a configuration diagram showing one embodiment of the present invention.

[Explanation of symbols]

7 ... Front panel, 8 ... Cleaner switch, 9 ... Switch shaft, 12 ... Cleaner arm, 14 ... Head cleaner, 21 ... Cassette insertion port, 23 ... Capstan, 24 ... Pinch roller, 28 ... Pinch roller arm, 30, 31 ...
.Arms, 34 ... springs

Claims (2)

[Claims] 1. A rotary head type reproducing apparatus in which a magnetic head is attached to a rotary drum, and a magnetic tape is wound around a peripheral surface of the rotary drum so as to run, and the slider is slid by turning head cleaning on / off. Made switch shaft, and the first and second switch shafts secured by using the switch shaft as a support shaft.
Arm, a spring provided at one end of the second arm to bias the switch shaft in one rotation direction, a third arm to which a pinch roller is rotatably attached, and a cleaner to rotate. When the fourth arm movably attached and the pinch roller are not pressure-bonded to the capstan, the biased second arm and the fourth arm are not in contact with each other, so that head cleaning is not performed. When the pinch roller is pressed against the capstan, the third arm abuts against the first arm and the first arm is abutted against the first arm.
The switch shaft is rotated via the arm of the head and the rotation of the switch shaft brings the second arm and the fourth arm into contact with each other to perform head cleaning. Revolving head type playback device. 2. The rotary head type reproducing apparatus according to claim 1, wherein a switch provided between a predetermined terminal of the CPU and ground performs an on / off operation in conjunction with the switch shaft. Rotating head playback device.