JPH11328792A - Magnetic head safety device - Google Patents

Abstract

(57) [Problem] To be able to attach a cassette tape to a main body without damaging a magnetic head and to close a cassette lid, even in a mechanical push button operation device, even in a play mode. Obtaining a magnetic tape device. SOLUTION: A magnetic head safety device 20 in a magnetic tape device 1 according to an embodiment of the present invention is a cassette tape type magnetic tape device provided with a mechanical push button operating device 10 and engages with an opening / closing operation of a cassette lid 3. The magnetic head 4 is disposed with the levers 22 and 24 that move to move and the lock plate 21 that locks the play lever 12 at the play position is pressed to release the lock, and the play position is at the play position. The play lever 12 is retracted to the stop position, and the magnetic head 4 is also retracted to the stop position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head safety device in a cassette tape type magnetic tape device in which a cassette tape is mounted on an inner surface of a cassette lid and the cassette tape is mounted on a magnetic head of a main body. is there.

[0002]

2. Description of the Related Art First, a conventional cassette tape type magnetic tape device (hereinafter simply referred to as "magnetic tape device") will be described with reference to FIG. FIG. 6 is a sectional side view of a conventional magnetic tape device.

A typical example of a magnetic tape device of the type in which a cassette tape is mounted on the inner surface of a cassette lid (or a cassette holder, hereinafter generally referred to as a "cassette lid") and the cassette tape is mounted on a magnetic head on the main body side. A typical example is a magnetic tape device such as Walkman (trademark) of Sony Corporation. In this type of magnetic tape device, there is provided a push button type operating device for switching a magnetic tape from a stop mode to a play mode for driving a recording / reproducing mode to a running speed, or vice versa, and for switching a magnetic tape to a fast forward mode and a rewind mode. Have.

The push-button operating device is constituted by a microcomputer or the like, which is capable of electronically switching the modes by pressing the push button with a feather touch, and a link component such as a lever. Some of the above modes are mechanically switched by relatively strong pressing.

[0005] Normally, when a cassette tape is mounted on the main body of the magnetic tape device, it is performed when the magnetic tape device is in the stop mode. However, some users open the cassette lid even during the play mode. There is a user who wants to change the cassette tape.

[0006]

However, as shown in FIG. 6, when the cassette lid 3 is opened from the main body 2 of the magnetic tape device 1, the cassette tape T is moved from the cassette lid 3 to the cassette tape 3.
When the magnetic head 4 disposed on the main body 2 side is in the forward position in the play mode (the position indicated by the broken line in FIG. 6) when the cassette tape T is mounted in the Even if the user attempts to mount the cassette tape T on the magnetic head 4 as shown by a broken line, the magnetic tape 4 cannot be mounted. In the worst case, the magnetic head 4 or the cassette tape T is damaged.

The feather-touch type magnetic tape device 1 having a push-button operating device usually has a magnetic head return mechanism. When the cassette lid 3 is opened during the play mode, the magnetic head 4 is moved to the position shown in FIG. The cassette tape T can be automatically retracted to the retracted position shown by the solid line, and thus can be mounted on the main body 2 without touching the cassette tape T to the magnetic head 4.

However, the mechanical magnetic tape device 1 having a push-button operating device usually does not have a magnetic head return mechanism, and when the cassette cover 3 is opened during the play mode, the magnetic When the head 4 is at the forward position indicated by the broken line in FIG. 6, the cassette tape T cannot be mounted, and in the worst case, the magnetic head 4 or the cassette tape T is damaged.

The present invention is intended to solve such a problem, and a cassette tape can be mounted on a main body and a cassette lid can be mounted even in a mechanical push button operating device or in a play mode. It is an object to obtain a magnetic tape device that can be closed.

[0010]

Therefore, in the magnetic head safety device of the present invention, the cassette lid is opened and closed, a cassette tape is attached to and detached from the main body in which the magnetic head is provided, and the driving of the magnetic tape is performed by a play. In a magnetic tape device configured to be controllable by a mechanical push button operation device having a button, a play lever connected to the play button and moving the position of the magnetic head to a play position or a stop position. A lock plate that engages with the play lever and controls the movement of the play lever to the play position or the stop position, and a control lever that engages with the lock plate and interlocks with the open position or the closed position of the cassette lid. When the cassette lid is opened when the magnetic head is at the play position, the control lever and the lock plate are connected to the cassette. When moving in conjunction with the lid, retracting the play lever to retract the magnetic head to the stop position, and when the magnetic head is at the play position, the cassette lid is changed from the open state to the closed state. The control lever and the lock plate are moved in conjunction with the cassette lid, and the play lever is retracted to connect the magnetic head to the stop position, thereby solving the problem. .

Therefore, according to the present invention, when the magnetic head is in the play position, the open cassette lid is closed to the main body side, or conversely, the closed cassette lid is opened from the main body, The magnetic head at the position can be retracted to the stop position, and the magnetic head is not damaged or deformed.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a housing lid opening / closing device according to an embodiment of the present invention. FIG. 1 shows a partial operation mechanism in a state where a mechanical push button operating device in a magnetic tape device is in a "stop" state. FIG. 1A is a plan view thereof, and FIG. Figure,
2 shows a partial operating mechanism when the operating device of the magnetic tape shown in FIG. 1 is operated from a "stop" state to a "play" state. FIG. 2A is a plan view, and FIG. FIG. 3 is an enlarged view of a portion viewed from an arrow in FIG. A, and FIG. 3 shows a safety device of a magnetic head in a magnetic tape device in a state where a cassette lid is opened according to the embodiment of the present invention. FIG. 4B is a side view of FIG. 3A, FIG. 4B is a side view of FIG. 3A, and FIG. 4 shows a magnetic head safety device in the magnetic tape device in a state where the cassette lid is being closed from the state shown in FIG. FIG. 5B shows a partial plan view, FIG. 5B shows a side view of FIG. A, and FIG. 5 shows a magnetic head safety device in a magnetic tape device in a state where the cassette lid is closed from the state shown in FIG. , FIG. A is a partial plan view, and FIG.
FIG.

First, the configuration and structure of a mechanical push button operating device in a magnetic tape device will be described with reference to FIGS. A mechanical push button operating device (hereinafter simply referred to as “push button operating device”) 10 includes a lock plate 11, a play lever 12, and the like.

The lock plate 11 is always pulled in the direction of arrow Xa by a spring (not shown). The lock plate 11 has a play button, a stop button, a fast forward button, and a rewind button (all shown in FIG. (Not shown), the lock holes 13, 14, 15, 16 are formed to press the levers connected to the respective buttons to lock the respective buttons in the pressed state.

On the other hand, the play lever 12 has a lock claw 122 which is bent downward to protrude from a base end 121 to which the play button is connected, and a connection protrusion 1 provided at the distal end.
23 and the like are formed. The latter connecting projection 123 is connected to a connecting member such as a gear constituting the tape winding drive. The former lock claw 122 is a member that fits into the lock hole 13 of the lock plate 11 and locks the play lever 12. Although not shown, the magnetic head 4 is mounted on the play lever 12.

Next, the operation of the push-button operating device 10 having the above-described configuration and structure will be described. By pressing the play button, the lock claw 122 of the play lever 12 attempts to push up the inclined end surface 111 of the lock plate 11 in the direction of the arrow Z, and therefore the lock plate 11 moves against the arrow Xa against the spring force of the arrow Xa. As a result, as shown in FIG. 2, the lock claw 122 is fitted into and engaged with the lock hole 13. When the play lever 12 is pushed off, the lock plate 11 returns to its original position because it is pulled by the spring in the direction of the arrow Xa. In this manner, the lock claw 12
When the lock lever 2 is engaged with the lock hole 13, the play lever 12 stops at the forward position, and the magnetic head 4 also moves forward into the cassette tape T, contacts the tape, and connects the leading end of the play lever 12. The projection 123 is connected to a gear or the like, and starts the operation of winding the tape in the cassette tape T.

The moving distance of the lock plate 11 in the direction of the arrow Xb is, for example, about 0.9 mm. Accordingly, the play mode can be released by moving the lock plate 11 0.9 mm (over stroke 1.2 mm) in the direction of the arrow Xb from the locked state.

From such a mechanical relationship, the magnetic head safety device of the present invention (hereinafter simply referred to as "safety device").
20 is provided so as to straddle the main body 2 and the cassette lid 3 side. As shown in FIG. 3, the safety device 20 includes a long lock plate 21 having a dimension and a shape in which the right end of the lock plate 11 is extended to the right end of the main body 2 of the magnetic tape device 1, for example.
And a plate-like lever 22 vertically attached to the inner surface of the right end of the cassette lid 3, and a main body in a state where one end is engaged with the lower end surface 23 and the other end is engaged with the right end of the lock plate 21. 2 and a lever 24 which is slidably mounted in the housing 2.

The inside corner of the right end of the lock plate 21 is finished into a tapered surface 21 as shown in FIG. 4A. The rotation axis of the lever 22 coincides with the rotation axis Co of the cassette lid 3, and opening and closing the cassette lid 3 also rotates the lower end surface 23 of the lever 22. Naturally, the lower end surface 23 also rotates. Its lower end surface 23
Is a protruding end surface 23a corresponding to the radius Da of the lever 22.
A retreating end face 23b linearly continuing to the right side but slightly retreating from the protruding end face 23a;
With a step on the left side of it, retreating slightly from the protruding end surface 23a,
It is composed of the retreat end face 23b and a retreat end face 23c formed at the same retreat position level.

The lever 24 is formed with two long holes 25 at predetermined intervals, and is slidably supported by fixed and guide pins 26 inserted in these long holes 25. I have. The lock plate 21 side tapered end surface 24a of the lever 24 is pushed by the tapered surface 21 of the lock plate 21 which is pulled in the direction of the arrow Xa by a spring, moves to the lever 22 side, and the lever 22 side end surface of the lever 24. 2
4b, as shown in FIG. 3B, when the cassette lid 3 is fully opened, the lever 4b comes into contact with and engages with the retreating end face 23b of the lever 22. The horizontal one-dot chain line Ha shown in the drawing is a line crossing this engagement contact, and the vertical one-dot chain line La is pulled in the direction of the arrow Xa by a spring and the position of the tapered surface 21 of the lock plate 21 at the rightmost end is located. Is a line indicating. In this state, the magnetic head 4 is located at the forward position in the play mode.

The safety device 2 of the above embodiment of the present invention
0 has the above-described structure. Next, an operation of retracting the magnetic head 4 at the play mode position to the stop mode position when the cassette lid 3 is closed and the cassette tape T is mounted on the main body 2 by the safety device 20 will be described.

As shown in FIG. 3, when the cassette lid 3 is fully opened, the cassette tape T
After that, when it is rotated about 20 ° from the fully open position in the direction of arrow R to close the main body 2, as shown in FIG. 4, the lever 22 also rotates and Da moves from the retracted end face 23b.
The end face 24b of the lever 24 is lifted by the protruding end face 23a projecting in the interval, and the lever 24 is pushed down in the direction of arrow Y by the distance Da from the position of the dashed line Ha to the position of the solid line Hb in the horizontal direction. When the lever 24 is depressed, the tapered end surface 24a of the lever 24
, The lock plate 21 moves in the direction of the arrow Xb by a distance Db from the position of the one-dot chain line La in the vertical direction to the solid line Lb. Therefore, as shown in FIG. 2, the lock claw 122 is disengaged from the lock hole 13, the play lever 12 returns to the stop mode position shown in FIG. 1, and the magnetic head 4 also retreats to the stop mode position.

When the magnetic head 4 retreats to the stop mode position, the cassette tape T is mounted at a predetermined position without contacting the magnetic head 4 and the cassette lid 3 is closed as shown in FIG. Can be. At this time, the end face 24b of the lever 24 is
c, the lever 24 returns to the original position shown in FIG. 3, and the play lever 12 is again in a lockable state.
Therefore, when the play button is pressed, the play lever 12
Moves forward to the position shown in FIG. 2, the lock claw 122 engages with the lock hole 13, and is locked in that state. The magnetic head 4 enters the cassette tape T, contacts the running magnetic tape, and records or reproduces information signals.

The projecting end face 23a and the retreating end face 23b or 2
Assuming that the distance Da from the position 3c is, for example, 1.5 mm, the lever 24 also moves by 1.5 mm, and the lock plate 21 moves the distance D from the position of the one-dot chain line La to the position of the solid line Lb in the vertical direction.
b, for example, move 1.2 mm.

The operation described above will be described with reference to FIG. 3 when the cassette lid 3 is fully opened and the magnetic head 4 is at the forward position in the play mode, and the cassette lid 3 shown in FIG. 5 is completely closed. The operation of retracting the magnetic head 4 to the retracted position has been described. Conversely, as shown in FIG.
When the cassette tape T is mounted at a predetermined position on the main body 2 and the magnetic head 4 moves forward and is in the play mode, normal operation is performed and the cassette lid 3 is forcibly opened. Presses the lever 24, the tapered end surface 24a of the lever 24 presses the tapered surface 21A of the lock plate 21, and the lock claw 122 engaged with the lock hole 13 is released, and the play lever 12
Retreats, and therefore, the magnetic head 4 also retreats to the stop position,
The cassette tape T is smoothly removed from the main body 2 when the cassette lid 3 is unlocked, and can be brought into a state as shown in FIG.

As exemplified by the numerical values in the above embodiment, it can be understood that the safety device 20 according to the embodiment of the present invention can protect the magnetic head 4 and the cassette tape T from a forcible operation with very little movement.

[0027]

As is apparent from the above description, according to the magnetic head safety device of the embodiment of the present invention, the position of the magnetic head of the magnetic tape device can be set to the play mode or the stop mode with a very simple mechanism. Whether or not they are
When the cassette lid is closed, the cassette tape can be mounted at a predetermined position on the main body, and even if the position of the magnetic head is in the play mode position, the magnetic head and the cassette tape may be damaged or deformed. The present invention has many excellent effects.

[Brief description of the drawings]

1 shows a partial operation mechanism of a mechanical push button operating device in a magnetic tape device in a “stop” state, FIG. 1A is a plan view thereof, and FIG. It is an enlarged view.

FIG. 2 shows a partial operation mechanism when the operating device of the magnetic tape shown in FIG. 1 is operated from a “stop” state to a “play” state. FIG. FIG. 2 is an enlarged view of a portion of FIG.

3A and 3B show a safety device for a magnetic head in a magnetic tape device in a state in which a cassette lid is opened according to the embodiment of the present invention. FIG. 3A is a partial plan view, and FIG. FIG.

FIG. 4 shows a magnetic head safety device in the magnetic tape device in a state where the cassette lid is being closed from the state shown in FIG. 3; FIG.
2 is a side view of FIG.

5 shows a safety device for the magnetic head in the magnetic tape device in a state where the cassette lid is closed from the state shown in FIG. 4, wherein FIG. 5A is a partial plan view, and FIG. FIG.

FIG. 6 is a cross-sectional side view of a conventional magnetic tape device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic tape device, 2 ... Main body of magnetic tape device 1, 3
... cassette lid of magnetic tape device 1, 10 ... push button operating device, 11, 21 ... lock plate, 12 ... play lever,
121: base end of play lever 12, 122: lock claw, 123: connection protrusion, 13, 14, 15, 16: lock hole of lock plates 11, 21, 22: lever, 23: lower end surface of lever 22, 23a ... projecting end surfaces of the lower end surface 23 of the lever 22; 23b, 23c ... retreating end surfaces of the lower end surface 23 of the lever 22, 24 ... levers, 24a ... taper end surfaces of the lever 24, 24b ... end surfaces of the lever 24, 25 ... elongated holes, 26 ... Fixed and guide pins, Da: Movement amount of lever 24, Db: Movement amount of lock plate 21

Claims (1)

[Claims] A cassette tape is attached to and detached from a main body in which a magnetic head is provided by opening and closing a cassette lid, and driving of the magnetic tape can be controlled by a mechanical push button operating device having a play button. A play lever connected to the play button to move the position of the magnetic head to a play position or to a stop position; and a play lever engaged with the play lever and moving the play lever to the play position. Alternatively, a lock plate for controlling the movement of the cassette to a stop position, and a control lever engaged with the lock plate and linked to an open position or a closed position of the cassette lid, the cassette is provided when the magnetic head is at the play position. When the lid is opened, the control lever and the lock plate move in conjunction with the cassette lid, and the play lever is retracted. When the magnetic head is retracted to the stop position, and the cassette lid is changed from the open state to the closed state when the magnetic head is at the play position, the control lever and the lock plate are moved to the cassette lid. A safety device for a magnetic head, wherein the magnetic head is connected so as to move in conjunction with the magnetic head and to retract the play lever to a stop position.