JPH0610519Y2 - Magnetic head switching device for cassette tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cassette type tape recorder having a reproducing function in a first direction and a reproducing function in a second direction which is the opposite direction to the first direction. In particular, it relates to a magnetic head switching device.

(B) Conventional technology Cassette type tape recorders that use a cassette tape in which a magnetic tape is housed in a container called a cassette have become widespread. Such a cassette type tape recorder has a function of continuously performing not only the reproduction operation in the first direction but also the reproduction operation in the second direction opposite to the first direction because of the necessity of performing the reproduction operation for a long time. The number of products equipped with a function called auto-reverse is increasing. The tape recorder having such an auto-reverse function is configured to perform the switching operation of the magnetic tape drive mechanism and the magnetic head in accordance with the reproduction direction. In addition, among cassette type tape recorders, there is a microminiature tape recorder that uses a cassette tape called a microcassette (trade name), and even a cassette type tape recorder that uses such a microcassette performs a long-time playback operation. For this reason, the auto reverse function is required,
As such a technique, for example, there is one disclosed in Japanese Utility Model Publication No. 62-24344.

(C) Problems to be Solved by the Invention In the technology disclosed in the above publication, the movable substrate to which the seesaw-type head substrate is attached is directly displaced with respect to the fixed substrate, and the movable substrate is a cassette tape. Since it is arranged at the bottom of the tape recorder, it is not suitable for downsizing and thinning of the tape recorder. The present invention is intended to provide a magnetic head switching device that improves such a point.

(D) Means for Solving the Problems The magnetic head switching device of the present invention is a capstan shaft whose rotation direction is switched according to the reproduction direction, and is rotatably attached to a fixed substrate and is used during reproduction operation. A rotating substrate which is displaced from a stop position to a reproducing operation position, and a capstan shaft which is rotatably attached to a rotation center shaft fixed to the rotating substrate and which is in the reproducing operation position. A pinch roller that is pressed against the head substrate, a head substrate that is rotatably attached by the rotation center shaft, and magnetic heads are fixed to both sides of the pinch roller, and between the head substrate and the rotating substrate. And a spring for urging the head substrate to rotate and a rotational displacement of the head substrate by a reproduction direction switching operation. It is more configuration as head switching member for controlling the work.

(E) Action The present invention is designed so that the pinch roller is rotatably attached and the substrate provided to be displaced from the stop position during the reproducing operation to the reproducing operation position is rotationally displaced with respect to the fixed substrate. By doing so, the displacement amount of the substrate is reduced.

(F) Embodiments The drawings are all related to the present invention. FIG. 1 is a plan view showing a stopped state, FIG. 2 is a plan view showing a reproduction state in a first direction, and FIG. 3 is a plan view showing a review state. FIG. 4 is an enlarged plan view of an essential part showing a stopped state, and FIG. 5 is a plan view showing a reproduction state in the second direction. In the figure, (1) is a capstan shaft that is inserted into a capstan hole (not shown) formed in the front center of the microcassette and that drives the magnetic tape (T) at a constant speed. It is configured to rotate clockwise during a reproduction operation in one direction and rotate counterclockwise during a reproduction operation in the second direction. (2) is a playback operation button that is pressed in the direction of arrow (A) during playback operation, and (3) is attached to the fixed substrate (4) so that it can be displaced in the directions of arrows (A) and (B). Is a reproduction operation lever having the reproduction operation button (2) attached to the end thereof, and is biased by the spring (5) in the direction of the arrow (B) which is the non-operating position, and the control pin (6 ) Is stuck. Reference numeral (7) is a rotating board which is rotatably attached to the fixed board (4) by a shaft (8). The rotation center axis (9) is fixed and the U-shaped spring (10) is attached. It is fixed by pins (11). Reference numeral (12) is an engaging piece formed on the rotary substrate (7), and is a first part constituting the U-shaped spring (10).
The pressing portion (10a) and the second pressing portion (10b) are related so as to elastically abut. Also, the playback operation lever
The control pin (6) fixed to (3) is the U-shaped spring (1
(0) is located between the first pressing part (10a) and the second pressing part (10b), which is in the direction of the arrow (A) which is the operating position of the reproduction operation lever (3). It is related to press the first pressing portion (10a) in the direction of arrow (A) during the displacement operation. ( 13 ) is a head substrate mounted on the rotating substrate (7) so as to be rotatable about the rotation center axis (9), and is a substrate portion (13a), which is perpendicular to the substrate portion (13a). The rising part (13b) formed on the upper part (13c) extending from the rising part (13b) and parallel to the substrate part (13a) and the rising part (13b) are formed at right angles. Switching piece
It is composed of (13d). (14) is a pinch roller rotatably attached by the rotation center shaft (9) between a substrate portion (13a) and an upper surface portion (13c) constituting the head substrate ( 13 ), and a reproducing operation At this time, the magnetic tape (T) is pressed against the capstan shaft (1) to drive the magnetic tape (T) at a constant speed. (15) and (16) are the head substrate ( 1
3 ) is a first magnetic head and a second magnetic head which are fixed to a substrate portion (13a) constituting the magnetic field, and contact the magnetic tape (T) during reproducing operation in the first direction and the second direction, respectively. It has the function of reproducing the signal recorded on the tape (T). (17) the other end of the head substrate with one end attached to the rotating substrate (7) is a spring attached to the (13), the rotation center axis the head substrate (13) (9) Has a function of urging to rotate in the counterclockwise direction. (18) is a head switching member rotatably attached by a shaft (19) to a support substrate (not shown) provided above the fixed substrate (4), and the head substrate ( 13 ) There is formed a pressing piece (18a) which comes into contact with the switching piece (13d) formed on the base plate and rotationally displaces the head substrate ( 13 ). (20) is a reproduction which is displaced between the position for performing the reproducing operation in the first direction shown in FIG. 1 and the position for performing the reproducing operation in the second direction shown in FIG. 5 corresponding to the reproducing direction. It is a direction switching member and is connected to the head switching member (18) by a connecting pin (21) as shown in the figure. The reproduction direction switching member (20) is configured to urge the head switching member (18) clockwise when it is in the position shown in FIG. (22) is rotatably attached to the fixed base plate (4) by the shaft (23), and the spring (2
4) is a control member that is urged clockwise by
It is associated with a rewinding member (not shown) so as to be rotationally displaced counterclockwise when a rewinding operation is performed. Reference numeral (22a) is a pressing projection formed on the control member (22), and when a rewinding operation, that is, a review operation is performed from the reproducing operation state, the rotating substrate (7) comes into contact with the rotating substrate (7). It has the effect of displacing 7) slightly clockwise. Reference numeral (25) is a restriction pin for restricting the clockwise rotation position of the control member (22). As described above, the present invention is
It is configured, and the operation will be described next.

The state shown in FIG. 1 is a stopped state, and the reproduction operation lever (3) is in the non-operating position. In addition, the playback direction switching member (2
0) is located at a position for performing the reproducing operation in the first direction, and the head switching member (18) connected to the reproducing direction switching member (20) by the connecting pin (21) is the head switching member (18). The pressing piece (18a) formed on the head substrate ( 13 ) is separated from the switching piece (13d) formed on the head substrate ( 13 ). And
In such a state, the head substrate ( 13 ) is a spring
It is urged in the counterclockwise direction by the urging force of (17), and the rotation position is regulated by contact with the regulation piece (7a) formed on the rotation substrate (7). . When the playback operation is performed in such a stopped state, the playback operation lever (3) is pressed by pressing the playback operation button (2) in the direction of the arrow (A).
Is the operating position against the biasing force of the spring (5)
It can be displaced in the (A) direction. The playback operation lever (3)
When is displaced in the arrow (A) direction, the control pin (6) fixed to the operation lever (3) moves the first pressing portion (10a) constituting the U-shaped spring (10) in the arrow (A) direction. Press. As a result, the U
The rotating base plate (7) to which the character-shaped spring (10) is attached is rotationally displaced counterclockwise about the shaft (8) to the state shown in FIG. When in the state shown in FIG. 2, the reproduction operation lever (3) is locked and held in the operating position by a lock mechanism (not shown), and the pinch roller (14) is pressed against the capstan shaft (1). It becomes a state. The pinch roller (14) is pressed against the capstan shaft (1) by the elastic force of the U-shaped spring (10). Further, in such a reproducing operation state, since the pressing piece (18a) formed on the head switching member (18) does not contact the switching piece (13d) formed on the head substrate ( 13 ), the head substrate ( 13 ) is in a position displaced counterclockwise by the urging force of the spring (17). As a result, the first magnetic head mounted on the head substrate ( 13 )
(15) comes into contact with the magnetic tape (T). Therefore,
The magnetic tape (T) is driven by a reel shaft (not shown) and is driven at a constant speed by the capstan shaft (1) and the pinch roller (14) to be driven at a constant speed in a direction indicated by an arrow (C). The reproduction operation of the signal recorded on the track of the magnetic tape (T) in the first direction is performed by the first magnetic head (15), so that the reproduction operation state in the first direction is configured. Become. Further, in such a reproducing operation state, the rotating substrate (7) is located at a position apart from the front end portion of the microcassette indicated by the chain double-dashed line, and is not inserted below the microcassette.

The operation when the reproducing operation is performed in the state shown in FIG. 1 is performed, but when the reproducing operation in the first direction shown in FIG. A case will be described. When the rewinding operation button (not shown) is operated in the state shown in FIG. 2, the drive mechanism of the reel shaft is in the state of performing the rewinding operation and the control member (22) is rotated counterclockwise. It can be displaced dynamically. When the control member (22) is rotationally displaced counterclockwise, the pressing projections (22a) formed on the control member (22) come into contact with the rotary substrate (7), and the rotary substrate (7) Is slightly rotated clockwise in opposition to the urging force of the U-shaped spring (10). FIG. 3 shows a state in which such a review operation has been performed. Although the pinch roller (14) is separated from the capstan shaft (1) by the rotational displacement operation of the rotational substrate (7),
The first magnetic head (15) is in contact with the magnetic tape (T). Therefore, the review operation of rewinding the magnetic tape (T) while reproducing can be performed. Then, when the pressing force on the rewinding operation button is released, the drive mechanism of the reel shaft returns to the state of performing the reproducing operation, and the control member (22) is rotated and displaced clockwise by the urging force of the spring (24). To be When the control member (22) is rotated and displaced in the clockwise direction, the clockwise displacement force of the rotating substrate (7) is cut off, so that the rotating substrate (7) is biased by the U-shaped spring (10). By this, the tape recorder is rotationally displaced to the reproduction operation position shown in FIG. 2 and the tape recorder is in the reproduction operation state in the first direction.

As described above, when the rewinding operation, that is, the review operation is performed in the reproduction operation state in the first direction, the operation is performed. Next, the reproduction operation in the second direction from the reproduction operation state in the first direction is performed. The switching operation to the state will be described. Such a switching operation of the reproducing direction is performed by detecting the end of the magnetic tape (T) or a reproducing direction switching operation button (not shown).
Is performed by the switching operation of. When the reproduction direction switching operation is performed in the reproduction operation state in the first direction shown in FIG. 2, the reproduction direction switching member (20) is displaced in the direction of the arrow (A) and the electric motor (not shown). The capstan shaft (1) is rotated counterclockwise by the switching operation of the rotation direction of the. The reproduction direction switching member (20) is indicated by an arrow (A).
Head switching member (18) connected to the reproduction direction switching member (20) by a connecting pin (21) when displaced in the direction.
Is rotated clockwise about the shaft (19). When the head switching member (18) is rotationally displaced in the clockwise direction, a pressing piece (18a) formed on the head switching member (18)
Is a switching piece (13) formed on the head substrate ( 13 ).
It comes into contact with d) and presses the switching piece (13d) in the direction of arrow (C) in FIG. As a result, the head substrate ( 13 ) is rotated and displaced clockwise about the rotation center axis (9) against the biasing force of the spring (17). FIG. 5 shows a state in which such a switching operation is performed, and as is clear from the figure, the second magnetic head (16) moves along with the rotational displacement operation of the head substrate ( 13 ). It comes into contact with the magnetic tape (T). Further, in such a state, the urging force of the reproduction direction switching member (20) in the arrow (A) direction acts as a force for urging the head substrate ( 13 ) clockwise through the head switching member (18). This biasing force is applied to the second magnetic head (16).
To press the magnetic tape (T) in good condition. When in the state shown in FIG. 5, the magnetic tape (T) is driven by the reel shaft (not shown) and driven by the capstan shaft (1) and the pinch roller (14) at a constant speed.
It is driven at a constant speed in the direction of arrow (D) which is the direction of the magnetic tape (T) by the second magnetic head (16).
Since the reproduction operation of the signal recorded on the track in the direction is performed, the reproduction operation state in the second direction is configured. When the rewinding operation, that is, the review operation is performed in the reproduction operation state in the second direction, the control member (22)
The displacement of the rotating substrate (7) is the first
The review operation can be performed in the same manner as the reproduction operation in the direction.

As described above, the switching operation from the reproduction operation state in the first direction to the reproduction operation state in the second direction is performed. Next, the reproduction operation state in the second direction is changed to the reproduction operation state in the first direction. The switching operation will be described. When the reproduction direction switching operation is performed in the reproduction operation state in the second direction shown in FIG. 5, the reproduction direction switching member (20) is displaced in the arrow (B) direction and the rotation direction of the electric motor is switched. The capstan shaft (1) is rotated clockwise by an operation or the like. When the reproduction direction switching member (20) is displaced in the direction of the arrow (B), the head switching member (18) connected to the reproduction direction switching member (20) by the connecting pin (21) moves the shaft (19). It is pivotally displaced counterclockwise about the center. When the head switching member (18) is rotationally displaced counterclockwise, a switching piece (13d) formed on the head switching member ( 13 ) by a pressing piece (18a) formed on the head switching member (18). Since the pressing force on the head substrate ( 13 ) is cut off,
The urging force of the spring (17) about the (9) center causes the urging force to rotate counterclockwise so that the state shown in FIG. 2, that is, the reproducing operation in the first direction is achieved. In this way, the switching operation from the reproduction operation state in the second direction to the reproduction operation state in the first direction is performed.

As described above, each operation of the present embodiment is performed, but when the stop operation button (not shown) is pressed in the reproduction operation state shown in FIG. 2, the operation position of the reproduction operation lever (3). The lock in is released. The playback operation lever
When the lock is released in the operating position of (3), the urging force of the spring (5) causes the playback operation lever (3) to move in the direction of the arrow.
It is slid back to the non-operating position, which is the (B) direction, and enters the stopped state shown in FIG.

Although the reproducing operation has been described in the present embodiment, the recording operation can be performed by using a magnetic head having a recording reproducing head and an erasing head incorporated therein as the first magnetic head 15 and the second magnetic head 16. It is clear that we can do it.

(G) Effect of the Invention In the magnetic head switching device of the present invention, the pinch roller is rotatably mounted and the head substrate to which the two magnetic heads are fixed is rotatably mounted on the central axis of rotation. Since the fixed substrate is configured to be rotationally displaced between the stop position and the reproducing operation position with respect to the fixed substrate, the displacement amount of the substrate can be reduced. It is very effective for miniaturization.

[Brief description of drawings]

The drawings are all related to the magnetic head switching device of the present invention. FIG. 1 is a plan view showing a stopped state, FIG. 2 is a plan view showing a reproducing state in a first direction, and FIG. 3 is a plan view showing a review state. 4 and 5 are enlarged plan views of a main part showing a stopped state, and FIG. 5 is a plan view showing a reproduction state in the second direction. Description of main drawing numbers (1) …… Capstan shaft, (3) …… Playback operation lever,
(4) …… Fixed board, (6) …… Control pin, (7) …… Rotating board, (9) …… Rotation center axis, (10) …… U-shaped spring, ( 1
3 ) …… Head substrate, (14) …… Pinch roller, (15)…
… First magnetic head, (16) …… Second magnetic head, (18) ……
Head switching member, (20) …… Playback direction switching member, (22) ……
Control member.

Claims (1)

[Scope of utility model registration request] 1. A cassette-type tape recorder having a reproducing function in a first direction and a reproducing function in a second direction which is the opposite direction of the first direction, and a capstan in which a rotation direction is switched according to the reproducing direction. A shaft, a rotary substrate that is rotatably attached to a fixed substrate and that is displaced from a stop position during a reproduction operation to a reproduction operation position, and a rotation center shaft that is fixed to the rotation substrate. And a pinch roller that is pressed against the capstan shaft when the rotating substrate is in the reproducing operation position, and is rotatably attached by the rotation center shaft, and magnetic heads are fixed on both sides of the pinch roller. Head substrate, a spring mounted between the head substrate and the rotating substrate and urging the head substrate for rotation, and a reproducing method. Switching more composed cassette tape recorder magnetic head switching device between the head switching member for controlling the rotational displacement movement of the head substrate together is caused to rotationally displaced by operation.