JPH0418367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cassette in which a tape for recording and playback is stored in a cassette half, and the tape for recording and playback is passed through a head surface to perform recording and playback. This invention relates to a cassette-type head cleaner for cleaning the head surface of a tape recorder.

[Technical background of the invention and its problems]

As a cassette-shaped head cleaner for cleaning the head surface of conventional cassette tape recorders,
The most commonly used cassette half contained a cleaning tape in place of the magnetic tape for recording and playback, and ran this tape to scrub and clean the head surface.

However, cleaning the head surface by rubbing the cleaning tape as described above causes significant wear on the head surface, and since the cleaning tape is run by the drive mechanism of the cassette tape recorder, it may take a long time if you forget to stop the drive. The rubbing of the head surface continued across the head, leading to premature head wear and deterioration of sound quality.

Furthermore, in devices such as microcassette tape recorders that use microcassettes, where the driving torque of the supply reel shaft is small, it is not possible to obtain enough driving torque to rub the head surface with the cleaning piece.

[Purpose of the invention]

In view of the above-mentioned points, the present invention uses a spring as the driving force to increase the driving torque, making it possible to rub the head with a cleaning piece, and since the spring finishes unraveling in a certain period of time, cleaning work can be continued over a long period of time. This is to prevent

When the mainspring is wound, the deceleration mechanism locks the mainspring to prevent it from unraveling.
The object of this invention is to simplify the operation by automatically rubbing the head with the cleaning piece when it is inserted into a cassette tape recorder and the head comes into contact with the cleaning piece.

[Embodiments of the invention]

A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

1 is a cassette-shaped case, and this case 1
Two gears 3 and 4 and a mainspring 5 whose one end is fixed to the case 1 are attached to a shaft 2 which is supported by the shaft.

The gear 4 is inserted into the notch 1a of the case 1.
The mainspring 5 can be wound by pressing the tip of a finger against the gear 4 from the outside of the case 1 and rubbing it against the gear 4. There is.

Further, the gear 3 meshes with a gear 6 having a square hole 6a, and the spring 5 can also be wound by inserting the square shaft 7a of the spring winding 7 into the square hole 6a and turning it. There is.

Furthermore, the gear 3 includes a first stage gear 8 of a reduction gear mechanism 8.
A final stage gear 8b, which is driven via a reduction gear mechanism 8 whose rotational speed is increased by several stages of gears, is brought into contact with a stopper portion 9a, which will be described later.

As a result, when the gear 3 or 4 rotates the shaft 2 in the direction of winding the mainspring 5, the stop on the final stage gear 8b by the stopper portion 9a is released and the final stage gear 8b rotates. Mainspring 5 can be wound.

When the gears 3 or 4 are rotated in the opposite direction, the final stage gear 8b rotates in the opposite direction and is prevented from rotating by the stopper portion 9a.
does not rotate, and therefore the shaft 2 moves in the direction of unwinding the mainspring 5.
cannot be rotated.

Even if the mainspring 5 is wound and the shaft 2 attempts to rotate in the direction in which it is unwound, the rotation direction of the final stage gear 8b is the same as before, so the stopper portion 9a
Because the final stage gear 8b does not rotate, the shaft 2 cannot rotate and the mainspring 5 maintains its wound state.

A frame 10 is installed on the case 1 so as to be slidable in the front and back direction, and a spring 11 is suspended between the frame 10 and the case 1.
At the same time, a mounting plate 12 is installed on the front surface of the mounting plate 12 so as to be able to move left and right. That's right.

The mounting plate 12 has three sets of mounting holes 12a, 12b, and 12c, each consisting of two holes, into which a mounting piece 13 having a cleaning piece 13a made of felt or the like can be selectively mounted. When installed in the mounting hole 12a, the erasing head is rubbed by the cleaning piece 13a, in the mounting hole 12b the recording/playback head is rubbed, and in the mounting hole 12c the erasing head during reverse recording is rubbed by the cleaning piece 13a.

In addition, the arm rod 12d provided on the mounting plate 12 is attached to the frame 1.
The crank pin 14a of the gear 14 that meshes with the gear 4 is fitted into the tip thereof, and when the gear 4 rotates, the gear 14 also rotates, and the crank pin 14a causes the mounting plate 12 to be rotated. is slid left and right.

Reel pedestal gears 15 and 16 that fit on the supply reel drive shaft and the take-up reel drive shaft mesh with the gear 14, and when the gear 4 rotates, these reel pedestal gears 15 and 16 also rotate.

However, when the mainspring 5 is fully unwound, its outermost periphery is in contact with the gear 14, so the rotation of the shaft 2 is prevented by this contact, and the reel pedestal gears 15 and 16 are moved through the gears 14 and 4. The rotation will be locked.

Furthermore, a protrusion 10b is provided on the frame 10, and the mounting plate 12 is attached to the stopper pin 1b by the biasing force of the spring 11.
When the projection 10b hits the stopper 9,
The stopper portion 9a of the stopper 9 functions to allow the final stage gear 8b to rotate in only one direction, as described above.

When the case 1 is placed in a cassette tape recorder and put into play mode, the head protrudes toward the tape surface, so the cleaning piece 13a is pushed by the head, and the frame 10 is also pushed backwards. The protrusion 10b also moves and leaves the stopper 9.

As a result, the stopper 9 becomes free,
When the rotation prevention of the final stage gear 8b is released from the front and the mainspring 5 is wound, the reduction gear mechanism 8
Due to the rotational resistance, the shaft 2 rotates at a substantially constant speed.

Therefore, the gear 6 is now rotated by the spring winding 7 or by sliding the gear 4 with the fingertip to rotate the gear 4 and wind the mainspring 5. By preventing the rotation of the portion 9a, the tape is kept in a wound state without being unraveled, and the tape is placed in a cassette tape recorder and put into play mode.

Then, the head of the cassette tape recorder protrudes and pushes the cleaning piece 13a, so that the frame 10 is pushed backwards against the spring 11 via the mounting plate 12, and the stopper 9 is released from being locked by the projection 10b. Therefore, the final stage gear 8b rotates, and the mainspring 5
Rotate gear 4 while unraveling.

The rotation of the gear 4 causes the gear 14 to rotate, and the crank pin 14a moves the mounting plate 12 left and right.
Depending on the mounting position of the mounting piece 13, the cleaning piece 13a is brought into contact with either the erasing head, the recording/reproducing head, or the erasing head in reverse mode, and is rubbed while being pressed by the biasing force of the spring 11.

In this way, these heads are wiped by the rubbing of the cleaning piece 13.

Then, when the mainspring 5 has finished unraveling, the mainspring 5
The outer periphery of the reel is in contact with the gear 14 and is prevented from unraveling, and the shaft 2 is locked, and the reel pedestal gears 15 and 16 are also locked, so the reel drive shaft is locked and the cassette tape recorder locks it. It is sensed that the playing state is canceled, that is, the head is stopped, and the head moves back.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. The same parts as in the first embodiment are denoted by the same reference numerals, and a description of these parts will be omitted.

The frame 20 corresponding to the frame 10 of the first embodiment is as follows:
It is formed only on one side of the case 1, and one end of the mounting plate 12 is placed thereon.

A pin 22 erected at one end of a swing arm 21 which is pivotally supported by the case 1 is inserted through the other end of the mounting plate 12, and a spring 23 is installed between the swing arm 21 and the swing arm 21.

A guide hole 21a is bored at the other end of the swinging arm 21, and an eccentric wheel 24a of a gear 24 that meshes with the gear 4 is inserted into the guide hole 21a.When the gear 24 rotates due to the rotation of the gear 4, the eccentric wheel 24a swings the swinging arm 21 while sliding within the guide hole 21a.

Therefore, the mounting plate 12 slides left and right by the pin 22, and the head is rubbed by the cleaning piece 13a, and the cleaning piece 13a is pushed by the head against the springs 11 and 23, and the frame 10 is pushed backward, the protrusion 10b separates from the stopper 9, and the final stage gear 8b can freely rotate.

This embodiment has the same structure and operation as the previous embodiment, except that the gear 4 is turned with a fingertip to wind the mainspring 5, and the above-mentioned points are all the same.

〔Effect of the invention〕

As mentioned above, in the present invention, a mainspring is housed in a cassette-shaped case, and this is used as a driving force to rub the cleaning piece while pressing it against the head surface. Head cleaning can be performed even when the drive torque of the shaft is weak.

Then, since the head surface is wiped with a cleaning piece such as felt, if the cleaning piece is soaked in a purifying liquid such as alcohol, it is quickly and completely purified, and the deterioration in sound quality can be recovered, and the cleaning tape can be removed. There is no wear on the head.

Moreover, since the mainspring finishes unraveling after a certain amount of time, the purification work does not have to continue over a long period of time.

Furthermore, since the deceleration mechanism is locked by the frame when winding the mainspring and when winding is finished, the mainspring does not unravel, making the winding work easy and eliminating the need for detents. The locking is released when the cleaning piece is pressed against the head surface, the mainspring is released, and the cleaning piece automatically performs the wiping operation, which has the advantage of being extremely easy to handle. .

[Brief explanation of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention, FIG. 2 is a plan view of its mainspring winding, and FIGS. 3 and 4 are a plan view and a rear view of the second embodiment. 1...Case, 5...Spring, 8...Reduction gear mechanism, 8b...Final stage gear, 9...Stopper, 9
a...Stopper part, 10...Frame, 10b...Protrusion, 11...Spring, 12...Mounting plate, 13a...
Cleaning piece, 20... Frame.

Claims (1)

[Claims] 1 Equipped with a cassette-shaped case, a mainspring stored in the case, a deceleration mechanism that reduces the return speed of the mainspring, and a cleaning piece, which is biased toward the head side and engages the deceleration mechanism. 1. A cassette-type head cleaner, comprising a frame that prevents the mainspring from returning, and the deceleration mechanism is released from the deceleration mechanism when the cleaning piece is pressed against the head.