JPH06150262A - Cleaning device of magnetic head - Google Patents

Abstract

PURPOSE:To practice an effective magnetic head-cleaning action by bringing a magnetic head-cleaning roller into contact with a rotating drum for a predetermined period other than a period during a tape-loading operation and thereafter by placing the roller in a waiting mode for waiting an operation mode command. CONSTITUTION:This device is composed of pilot guide blocks 24, 25 for taking out a magnetic tape T from a cassette C and winding the tape around a rotating drum 23 for a predetermined angle, cam gear 2 rotating according to an operation mode, slide 3 interlocking with the cam gear, tape take-out guide lever 4 rotating in association with the slide, magnetic head-cleaning means 15-18 interlocking with the guide lever and lock means 19-21 interlocking with pinch roller-contact bonding means 10-14. The lock means lock said magnetic head- cleaning means while interlocking with the contact bonding operation of said pinch roller-contact bonding means.

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 used in a magnetic recording / reproducing device such as a VTR (video tape recorder).

[0002]

2. Description of the Related Art As a conventional magnetic head cleaning mechanism, the tape is pulled out from a cassette, and a so-called tape pulling member that winds a tape at a predetermined angle around a rotary drum is used to move the tape pulling member at a certain position. There is a configuration in which a roller support arm is arranged so that the cleaning roller contacts the rotating drum. For example, Japanese Patent Laid-Open Publication No. 1-282716 (G11B 5)
/ 41).

[0003]

However, the conventional head cleaning operation mechanism has a problem in that the head cleaning roller operates only for a moment during the tape loading operation, and effective head cleaning is not performed.

[0004]

SUMMARY OF THE INVENTION A magnetic head cleaning operation mechanism according to the present invention comprises a leading guide block for pulling out a magnetic tape from a cassette and winding the magnetic tape around a rotary drum at a predetermined angle, a cam gear that rotates according to an operation mode, and a cam gear. And a tape pull-out guide lever that rotates in relation to the slide, a magnetic head cleaning unit that interlocks with the guide lever, and a lock unit that interlocks with the pinch roller crimping unit. Is linked to the crimping operation of the pinch roller crimping means,
The magnetic head cleaning means is locked.

[0005]

The magnetic head cleaning means operates in synchronization with the operation of pulling out the tape from the cassette to start the cleaning of the magnetic head, and the magnetic head cleaning means operates even after the completion of pulling out the tape from the tape guide guide block. The cleaning operation is continued until the rotation of the mode cam gear is completed within a predetermined angular range, and the cleaning operation of the magnetic head cleaning means is ended in conjunction with the movement of the pinch roller pressing lever, and the magnetic head cleaning means is locked at the release position. To do.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the magnetic head cleaning device of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a play mode by main components, FIG. 2 is a plan view when a cassette is mounted, FIG. 3 is a plan view at the time of starting tape loading, FIG. 4 is a plan view during tape loading, and FIG. FIG. 6 is a plan view when head cleaning is released by pinch roller pressure bonding, FIG. 7 is a plan view in stop mode, FIG. 8 is a plan view immediately before unloading is completed, and FIG. It is a side sectional view. 2 to 9, some of the components are omitted to make the drawings easier to see. Therefore, for a detailed description of the operation of the omitted components, refer to Japanese Patent Application No. 4-272972 filed earlier.

In FIG. 1, reference numeral 2 is a cam gear for switching the operation mode, 3 is a follower pin 3a which engages with a cam groove 2a of the cam gear, and slide 4 for switching the operation mode slides left and right in the drawing, and 4 is a circle. The arc-shaped gear portion 4a is integrally formed,
A tape pull-out guide lever in which a tape pull-out pin 5 is fixedly planted, and 6 is a gear portion 6a which meshes with the gear portion 4a.
, 8 is a relay lever in which the pin 7 is solidly implanted, 8 is a lever in which the pin 7 is sandwiched in the bifurcated notch, and the pin 8a which penetrates into the cam groove 3b of the slide 3 is firmly implanted, 9 is a pin 7, a pin 10a is fixedly planted, and a pinch roller 11 is rotatably attached to one end of the pinch roller lever 10, and a pin 12a clamps the pin 10a in a notch portion to provide a controlled protrusion. A crimp lever having a piece 12a formed thereon, 13 a torsion spring for urging the pin 10a, 14 having bifurcated tongue pieces 14a and 14b at one end, and a through hole 14c into which the pin 3c of the slide 3 is inserted at the other end. Is a regulating lever, and each lever is a shaft 1a fixed to the chassis,
It rotates about 1b, 1c, 1d and 1e. The pinch roller lever 10 is constantly urged to CW by the spring coil 29.

Reference numeral 15 denotes a rotating lever having a cleaning roller 16 for cleaning a magnetic head rotatably at one end thereof, and a locking projection 15a formed at the other end thereof, and 17 has one end 17a abutting the guide lever 4. A control lever 18 that contacts and separates, a spring coil 18 hung between the rotating lever 15 and the control lever 17, and a lock recess 19a and a pin 19b formed in 19, and the spring coil 20 urges the coil coil counterclockwise (CCW). The lock lever 21 is a through hole into which the pin 19b is inserted at one end and the relay lever whose other end 21a abuts and separates from the pressure bonding lever 12, 22 is a capstan, 23 is a rotary drum, and 24 and 25 are respectively. Leading guide blocks for tape pulling out on the supply side and the winding side, which slide in guide grooves 1j, 1k formed in the chassis, and 27 are impellers. Dance rollers 28, 28 are arranged rotatably, a bracket as a stopper member of the leading guide block 24, 25. In addition, in FIG.
1 is a chassis, C is a cassette, and T is a magnetic tape.
The rotating lever 15, the cleaning roller 16, the control lever 17, and the spring coil 18 constitute magnetic head cleaning means, and the lock lever 19, the spring coil 20, and the relay lever 21 constitute lock means.

Next, the operation of the present invention will be described. When the cassette C is mounted, the state shown in FIG. 2 is obtained. In FIG. 2, the guide lever 4 for pulling out the tape prevents the leading guide block 25 from moving, and the leading guide blocks 24 and 25 are in the cassette C. The cleaning roller 16 is separated from the rotary drum 23. Here, with respect to the distance L ₁ from the fulcrum 1f of the rotating lever 15 to the point P (the contact point between the protrusion 15a and the control lever 17 is P),
By setting the distance L ₂ from the fulcrum 1g of the control lever 17 to the point P to be short (L ₁ > L ₂ ), the spring coil 18 suspended between both levers causes the cleaning roller 16 to move as shown in the figure. It is stably held in a state of being separated from the rotary drum 23 (see FIGS. 2 and 1).

The rotation of the cam gear 2 causes the slide 3 to slide to the right, and the lever 8 to rotate clockwise (CW) via the pin 8a. The relay lever 6 is C via the pin 7.
Turn to CW. As a result, the guide lever 4 moves to the tape T
While pulling out, rotate to CW. By the rotation of the guide lever 4, one end 17a of the control lever 17 is pressed, and the lever 17 rotates to CCW. Therefore, the turning lever 1
5 rotates about axis 1f to CCW. As a result, the cleaning roller 16 contacts the rotating drum to start cleaning the rotating magnetic head (FIGS. 3 and 1).
reference).

As the cam gear 2 rotates, the leading guide blocks 24, 25 pull out the tape T and guide groove 1
By sliding j and 1k, the pinch roller lever 10 is disengaged from the rotation path of the pinch roller lever 10, so that the pinch roller lever 10 is rotated to CW by the biasing force of the spring coil 29.
At this time, the slide 3 further slides to the right, but the regulating lever 14 does not rotate. As the pinch roller lever 10 rotates, the coaxial pressure bonding lever 12 moves around the shaft 1d in the CW direction.
Then, the to-be-regulated projecting piece 12a comes into contact with the bifurcated tongue piece 14b of the regulating lever 14. That is, the pinch roller 11 is held at a position close to the capstan 22. At this point, the crimp lever 12 only contacts the other end 21a of the relay lever 21 and does not act on the lock lever 19. Therefore, the cleaning operation of the magnetic head continues (see FIGS. 4 and 1).

FIG. 5 shows a state in which the pulling-out of the tape T from the cassette C by the leading guide blocks 24 and 25 is completed. In this state, the magnetic head cleaning operation is continued.

The cam gear 2 continues to rotate, and the slide 3
The regulation lever 14 is rotated to CCW by the sliding of the control lever, so that the regulated protruding piece 12a is released, and the crimping lever 12 moves to C.
Rotate to W. As a result, the pinch roller lever 10 rotates to CW, and the pinch roller 11 comes into pressure contact with the capstan 22. By rotating the crimp lever 12, the relay lever 2
The other end 21a of the relay lever 21 is pressed and the relay lever 21 moves to the shaft 1i.
Since it rotates to CCW centering around, the lock lever 19 resists the urging of the spring coil 20 and the CW centering around the shaft 1h.
Rotate. As a result, the lever 15 rotates to CW, and the projection 15a of the rotation lever 15 is engaged and locked in the lock recess 19a of the lock lever 19. At this time, the cleaning roller 16 is separated from the rotary drum 23, and the cleaning operation of the magnetic head is released (see FIGS. 6 and 1).

After that, while the lever 15 remains locked by the lock lever 19, the pinch roller 11 once enters the stop mode (see FIG. 7) in which the pinch roller 11 is separated from the capstan 22, and each operation is performed by instructing the operation mode. The mode is executed. FIG. 8 is a plan view of a state immediately before unloading, in which the cam gear 2 is rotated by an eject operation, and the slide 3 slides, whereby the respective parts perform the reverse operation to the loading operation.
25 slides in the guide grooves 1j and 1k and is housed in the cassette mouse. The projecting piece 10b of the pinch roller lever 10 is pressed by the leading guide block 25 to rotate to CCW, and is similarly housed in the cassette mouse. Since the pressure lever 12 rotates together with the pinch roller lever 10 to CCW,
The other end 21a of the relay lever 21 is released.

Subsequently, the tape pull-out guide lever 4 also rotates in the CCW in association with the sliding movement of the slide 2 and abuts against the leading guide block 25 so as to come into contact with the leading guide block 25.
Hold 5 in the unloading position. Guide lever 4
Of the control lever 17 to the CCW of one end 17a
Is released. As a result, the urging force of the spring coil 18 causes the control lever 17 to rotate about the shaft 1g in the CW direction to press the protrusion 15a of the rotation lever 15, so that the rotation lever 15 is unlocked. Therefore, the lock lever 19 is also CCW by the biasing force of the spring coil 20.
It turns to and returns to the initial state of FIG. As described above, the turning lever 15, the control lever 17, and the spring coil 1
Due to the balance relationship of 8, the cleaning roller 16 returns to the state shown in FIG.

The operation period of the cleaning roller 16 of the present invention can be set as appropriate by controlling the rotation angle of the cam gear 2 for the operation mode by the microcomputer. In the present invention, after the tape loading is completed,
After the cam gear 2 is rotated to pseudo-execute each operation mode, each operation is executed by the original operation mode command. FIG. 9 is a partial side sectional view of main components, and the cleaning roller 16 is rotatably attached along the inclination of the rotary drum 23.

[0017]

The effect of the present invention is that the head cleaning operation is performed only for a moment in the tape loading mode of pulling out the tape from the cassette, and the effect can be expected. However, the configuration of the present invention does not lengthen the tape loading operation time, and the cleaning time is increased. Extension is possible and effective magnetic head cleaning is performed.

[Brief description of drawings]

FIG. 1 is a plan view of a play mode including main components.

FIG. 2 is a plan view when a cassette is attached.

FIG. 3 is a plan view at the start of tape loading.

FIG. 4 is a plan view during tape loading.

FIG. 5 is a plan view during head cleaning after completion of tape loading.

FIG. 6 is a plan view at the time when head cleaning is released by pinch roller pressure bonding.

FIG. 7 is a plan view of a stop mode.

FIG. 8 is a plan view immediately before the completion of unloading.

FIG. 9 is a partial side sectional view of main components.

[Explanation of symbols]

 2 Cam gear 3 Slide 4 Tape pullout guide lever 10 Pinch roller lever 12 Crimping lever 15 Rotating lever 16 Cleaning roller 17 Control lever 19 Lock lever 21 Relay lever 25 Leading guide block

Claims (3)

[Claims] 1. A magnetic recording / reproducing apparatus for drawing a magnetic tape from a cassette and winding the magnetic tape around a rotary drum at a predetermined angle.
A magnetic head cleaning device comprising: a magnetic head cleaning unit that abuts on the rotary drum, and operates the magnetic head cleaning unit for a predetermined period after completion of pulling out the magnetic tape. 2. The magnetic head cleaning device according to claim 1, wherein the operating period of the magnetic head cleaning means depends on a predetermined rotation angle of the operation mode cam gear. 3. A leading guide block for pulling out a magnetic tape from a cassette and winding the magnetic tape around a rotary drum at a predetermined angle, a cam gear that rotates in accordance with an operation mode, a slide that interlocks with the cam gear, and a rotation related to the slide. Tape pull-out guide lever, magnetic head cleaning means interlocking with the guide lever, and locking means interlocking with the pinch roller crimping means, the locking means interlocking with the crimping operation of the pinch roller crimping means. A magnetic head cleaning device, characterized in that the magnetic head cleaning means is locked.