JPH0227742B2 - TEEPUREKOODANOMOODOKIRIKAESOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the pinch roller is separated from the capstan, the recording/playback head is positioned at the music sensor in contact with the tape, and the pinch roller is attached to the capstan.
The recording/playback head relates to a mode switching device for a tape recorder that changes the position of the recording/playback head, such as the play position in contact with the tape, and the pinch roller.

Conventional tape recorder mode switching devices of this type include those shown in FIGS. 1 and 2.

To explain this with reference to the diagram, 1 is a base, on which a pinch arm 4 with pinch rollers 2 and 3 pivotally supported, and a sub-pinch arm 5 are rotatably supported on shafts 6 and 7. There is.

Further, 8 is a pinch base, whose grooves 8a and 8b are fitted to pins 9 and 10 established on the base 1, and the base 1 is
is rotatably supported on a shaft 11, and a spring 13 is attached to one end.
Insert the pin 14a of the actuating arm 14 that has been installed into the notch 8c of the pinch base 8, and
is rotated by a solenoid plunger or the like (not shown), and moves the pinch base 8 up and down.

A pressure arm 17 and a sub-pressure arm 18 are pivotally supported on the pinch base 8 by shafts 15 and 16, and the tips of the pressure arm 17 and the sub-pressure arm 18 clamp the tips of the pinch arm 4 and the sub-pinch arm 5. And pinch base 8
A pinch spring 19 and a sub-pinch spring 20 are installed between the pressure arm 17 and the sub-pressure arm 18, respectively. When the pinch base 8 moves upward as described above, the pinch rollers 2 and 3 are moved to the capstans 21 and 22, respectively. However, the tips of the pinch arm 4 and the sub-pinch arm 5 move in a direction to pass through the width of the portions held by the pressure arm 17 and the sub-pressure arm 18,
The pinch rollers 2 and 3 are pressed against the capstans 21 and 22 by the force of the pinch spring 19 and the sub-pinch spring 20.

Reference numeral 23 denotes a head base, to which a sub-head base 26 to which a recording/playback head 24 and an erasing head 25 are attached is fixed to the upper part, and balls 27 and 28 are interposed between the sub-head base 26 and the base 1. On the other hand, the head base 23 is slidable up and down, and the movement of the solenoid plunger is transmitted by a connecting arm or the like (not shown) to move the head base 23 up and down.

FIG. 1 shows the stop state, and when the actuating arm 14 is rotated in the direction of arrow A by the solenoid plunger in response to a play command, the pinch base 8 is actuated in the direction of arrow B as described above, and the pinch arm 14 is rotated in the direction of arrow B as described above. , pinch rollers 2 and 3 of sub-pinch arm 5
is pressed against the capstans 21 and 22, assumes the second position, and enters the play state.

Further, the head base 23 is raised in the direction of arrow B by the operation of a solenoid plunger or the like, and its recording/reproducing head 24 and erasing head 25 come into contact with the tape and assume the second position, thereby entering the playing state.

When returning from this play state to the stop state,
The pinch base 8 is mounted on the operating arm 14 and is returned to the state shown in FIG. 1 by a spring 13, and the head base 23 is returned to the state shown in FIG. 1 by a head base return spring (not shown).

In this way, in a conventional tape recorder mode switching device, the head base with the recording/playback and erasing head and the pinch arm with the pinch roller are operated by separate members, so there are many parts and the parts cost is low. As the number of parts increases, the number of assembly steps required increases, resulting in an increase in assembly costs, leading to an increase in cost. In addition, there are disadvantages such as poor positional accuracy and loud operating noise since each of the separate members operates individually.

Furthermore, in order to shift from the stop state to the play state, the pinch base and head base are moved against the spring of the operating arm and the head base return spring (not shown), so the operating power of the solenoid plunger must be greater than necessary. It was impossible.

In addition to the above-mentioned method, there is also a method that simultaneously moves the head base and the pinch roller by driving the head base, but if an intermediate mode such as the above-mentioned music sensor is required, There are drawbacks such as the pinch roller remaining close to the capstan and the risk of damaging the tape.

The present invention reduces the cost by reducing the number of parts, has high precision, low operating noise, and requires only a small amount of power for a mode switching activation device such as a solenoid plunger, thereby eliminating the drawbacks of the conventional method. The purpose is to

Embodiments of the present invention will be described below with reference to FIGS. 3 to 9.

Reference numeral 30 denotes a base, and a pinch roller 3 is a pinch roller holding member that pivotally supports the pinch rollers 2 and 3.
1. The sub-pinch arm 32 is rotatably supported on shafts 33 and 34 established on the base 30.

A pressure arm 35 and a sub-pressure arm 36 are also rotatably supported on the shafts 33 and 34, and projections 35a, 36a and 35b, 36 provided thereon.
A pinch arm 31 and a sub-pinch arm 32 are sandwiched between the two parts b, and the pinch arm 31 and the pressure arm 35 are interlocked with each other, and the sub-pinch arm 32 and the sub-pressure arm 36 are interlocked with each other.

Reference numeral 37 is an operating member, and guide pins 38 and 39 provided therein are connected to guide holes 30a and 30b of the base 30.
The actuating member 37 is inserted into the base 30 and
It is designed to be able to slide up and down.

Springs 40 and 41 are stretched between the projecting pieces 37a and 37b of the actuating member 37, the pin 35c of the pressure arm 35, and the pin 36c of the subpressure arm 36, and the pin 35d of the pressure arm 35 is held in engagement with the actuating member 37. A pin 36d of the subpressure arm 36 is pressed against the locking portion 37d.

Reference numeral 42 denotes a head holder to which the recording/playback head 24 and erasing head 25 are attached, and the head base spring 4 is inserted between the projecting piece 42a and the pin 38 of the actuating member 37 passing through the guide hole 42b of the head holder 42.
3 is stretched, and the head holding table 42 is urged upward.

The pin 42c of the head holder 42 is connected to the base 3.
0, and is slidably mounted on the base 30 via balls 44a, 44b, 44c. It is in contact with the locking portions 37e and 37f.

An actuation arm 46 is rotatably supported on a shaft 45 of the base 30, and a guide pin 38 of an actuation member 37 is fitted into the elongated hole 46a. The actuating member 37 moves up and down.

The base 30 also has a shoulder 42 of the head holder 42.
A positioning pin 47 is established, with which the stop position is determined.

21 and 22 are capstans.

Although FIG. 3 shows the stopped state, when the solenoid plunger or motor etc. is activated by the operation command and the actuating arm 46 starts moving in the direction of arrow C in FIG. The pin 38 is pulled and the actuating member 37 begins to rise,
The head holder 42 also rises by being pulled by the head base spring 43, but the shoulder 42g of the head holder 42
does not reach the positioning pin 47, and the pin 42
e and 42f are locking portions 37e and 37 of the actuating member 37
f, and the recording/reproducing head 24 and erasing head 25 are in a first position close to the tape.

At this time, pinch arm 31, sub pinch arm 3
2, the pin 35d of the pressure arm 35 is locked to the locking part 37c of the actuating member 37, and the pin 36d of the subpressure arm 36 is locked to the locking part 37d, so the pinch rollers 2 and 3 are The first position is separated from the capstans 21 and 22.

This state is the music sensor mode and is shown in FIG.

When the rotation of the actuating arm 46 in the direction of arrow A continues, the actuating member 37 rises further in the same manner as described above, and the head holder 42 is pulled by the head base spring 43 so that its shoulder 42g comes into contact with the positioning pin 47. , the head holding base 42 is prevented from rising any further, resulting in the state shown in FIG.
The head holder 42 does not rise any further and is held in the second position where the head is pressed against the tape.

As the actuation arm 46 continues to rotate in the direction of arrow A, the actuation member 37 also continues to rise, and the pinch roller 2 of the pinch arm 31 comes into contact with the capstan 21, causing the capstan 2 to move upward.
1 rotation starts driving the tape, resulting in the state shown in FIG.

However, since the actuating member 37 continues to rise, the pin 35d of the pressure arm 35
7, the spring 40 is expanded, and the pinch arm 31 comes to press the pinch roller 2 against the capstan 21 due to its force.

Next, as the operating member 37 continues to rise, the pinch roller 33 of the sub-pinch arm 32 comes into contact with the capstan 22, and the tape is fed out by the rotation of the capstan 22, resulting in the state shown in FIG.

After that, the actuating member 37 rises slightly, and the pin 36d of the subpressure arm 36
The spring 41 is expanded and the pinch arm 32 is released from the locking portion 37d of the pinch roller 3 due to its force.
is brought into pressure contact with the capstan 22, and the pinch rollers 2 and 3 take the second position where they are brought into pressure contact with the capstans 21 and 22, resulting in the state shown in FIG. 8, and the play mode is entered.

That is, first the recording/playback head 24 and the erasing head 2
5 comes into contact with the tape and starts recording or playback, then the pinch roller 2 on the take-up side touches the capstan 2.
1 to take up the tape, and then the pinch roller 3 on the feed side contacts the capstan 22 to feed the tape, ensuring reliable recording and playback and tape The slack will be taken up.

In addition, in order to shift from the play mode shown in FIG. 8 to the stop mode shown in FIG.
By canceling the power transmission to the solenoid plunger 6, the motor, etc., each operation is performed in the reverse order of the above operations. At this time, the head base spring 43, springs 40, 41 are acts as a return spring to lower the actuating arm 46 and rotate the actuating arm 46 in the opposite direction.

That is, the compressive force of the expanded head base spring 43 and the springs 40 and 41 cause the pressure arm 3 to
5. Pin 35d of subpressure arm 36, 3
6d tries to contact the locking portions 37c, 37d of the actuating member 37, and the pins 35 of the pinch arm 31, the shafts 33, 34 of the sub-pinch arm 32, the pressure arm 35, and the sub-pressure arm 36.
The actuating member 37 receives a downward force because the other ends of the springs 40, 41, which are applied to the springs 40, 41, which are applied to the protrusions 37a, 37b of the actuating member 37 act as fulcrums of force.

In the above embodiments, the pinch arm and the pressure arm are separate members, but there is no problem even if they are integrated.

Further, although the dual capstan type is used in which a capstan and a pinch roller are provided on each side of the head, a single capstan type may be used in which a capstan and a pinch roller are provided only on the right side.

As described above, the present invention provides a biasing force that biases the pinch roller holding member toward the capstan, and a biasing force that biases the head holding base toward the tape.
The pinch roller and the head are separated from the capstan and the head by being locked by the locking portion of the operating member, and as the operating member moves, the head holding base is pressed against the positioning member, and the pinch roller is pressed against the capstan. Since the actuator operates integrally with the actuating member until the actuating member is turned on, it is difficult to generate operation noise, which is noise.

In addition, since the first position of the pinch roller holding member and head holding base in the music sensor mode is determined by the movement position of the actuating member, the operation stop position of the solenoid plunger, motor, etc. that moves the actuating member cannot be determined. By determining this, you can ensure that it is kept in the correct position.

Furthermore, since the movement of the pinch roller holding member and the head holding table is performed by the operation of a single actuating member, the number of parts is small and the work is easy to assemble.
You can measure cost reduction.

In addition, the biasing force that presses the pinch roller against the capstan and the biasing force that moves the head holder toward the tape side act as return springs for the actuating member, so unnecessary biasing force is not required, and the solenoid that operates the actuating member acts as a return spring. The activation sources such as plungers and motors require minimal force, and energy can be used effectively.

Furthermore, since the moment swing caused by the pinch pressure occurs only in the operating member and does not affect the head holder, the head holder does not float due to the pinch pressure, allowing stable head-touch tape running. It has many advantages such as:

[Brief explanation of drawings]

1 and 2 are front and bottom views of a conventional mode switching device for a tape recorder, FIGS. 3 to 9 show embodiments of the present invention, and FIGS. 3 to 8 show the operating order thereof. 9 is a front view, and FIG. 9 is a bottom view. 2, 3...pinch roller, 21, 22...capstan, 24...recording/playback head, 25...erasing head, 30...base, 31...pinch arm, 32...sub pinch arm, 37... Operating member, 37c, 37d...Locking part, 37e, 37f
... Locking portion, 40, 41 ... Spring, 43 ... Head base spring, 47 ... Positioning pin.

Claims (1)

[Claims] 1. It has at least one pinch roller holding member which pivotally supports the pinch roller and is pivotally supported by the base and is always urged toward the capstan, and a recording/playback/erasing head, and is movable on the base. a head holder that is always biased in the direction of pressing against the tape; a locking portion that contacts the pinch roller holding member to separate the pinch roller from the capstan; a head positioning member installed on the base to determine the position at which the head on the head holder comes into contact with the tape, and to which the biased head holder comes into pressure contact; , the head holding base is close to the head positioning member,
The pinch roller holding member is capable of taking a first position in which it is held in the locking portion of the actuating member, a second position in which the head holding member is in pressure contact with the head positioning member and the pinch roller is in pressure contact with the capstan. Tape recorder mode switching device.