JPH045062Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Present Invention> The present invention relates to a mode switching device for a tape recorder.

<Prior art> Generally, the playback mode is obtained by energizing a playback electromagnetic solenoid, but in tape recorders that also have a song interval detection function, due to their structure, when a song interval is detected, the playback mode is determined by turning the tape recorder back into the playback mode. A separate electromagnetic solenoid for detection is provided.

However, such conventional tape recorders have the disadvantage that they require an additional relatively expensive electromagnetic solenoid as mentioned above, which increases the cost and makes it impossible to provide an inexpensive tape recorder. .

<Purpose of the present invention> The present invention was devised in view of the problems of the conventional mode switching device as described above, and it also performs a song interval detection operation on the electromagnetic solenoid for switching the tape recorder to the playback mode. Let them
The number of electromagnetic solenoids is reduced compared to conventional devices.

<Configuration of the present invention> An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a plan view showing the stop mode of the mode switching device according to the present invention. In the figure, 1 is the main board, and 2 is the main board 1. A magnetic head 3 for recording and reproducing is mounted on a head substrate which is supported by a spring 4 so as to be able to move and is always biased by a spring 4 in the direction of arrow B, that is, in the direction of the stop position.

Of course, this head board 2 has a stop position where the magnetic head 3 is separated from the magnetic tape T, a reproduction position where the magnetic head 3 is in contact with the magnetic tape T, and a position slightly retreating from this reproduction position. It is possible to take an inter-track detection position in which the magnetic tape T is brought into light contact with the magnetic tape T.

Reference numeral 5 denotes an electromagnetic solenoid, which moves the movable iron core 6 in the direction of arrow M or L depending on whether or not it is energized.

7 is a rectangular-shaped regeneration lever whose center portion is pivoted on the main board 1 by a shaft 1a between the head board 2 and the electromagnetic solenoid 5, and one end of which is connected to the engaging pin on the head board 2. 2a, and the other end is engaged with the upper end of the engaging pin 6a of the movable iron core 6, so that the head board 2 is reciprocated in relation to the spring 4 as the movable iron core 6 moves in and out. It is completed.

8 is a high-speed feed lever for fast forwarding or rewinding, which can reciprocate on the main board 1 in the directions of arrows E and F;
It is always urged by a spring 9 in the direction of arrow F, that is, in the direction of the non-operating position.

Reference numeral 10 designates a first locking lever in the shape of a square whose central portion is pivoted on the main board 1 by a shaft 1b between the high-speed feed lever 8 and the electromagnetic solenoid 5, and whose one end is connected to the movable iron core 6. A lock claw 10a is engaged with the lower end of the engagement pin 6a and provided at the other end.
can be engaged with the lock pin 8a of the high speed feed lever 8.

Note that this first locking lever 10 is constantly applied with a rotational force in the direction of arrow G by a spring 11 suspended between it and the main board 1.

Reference numeral 12 denotes a song interval detection mode switch, which is disposed behind the high-speed feed lever 8, and is turned on when the actuator 12a is pressed by the high-speed feed lever 8 in the playback mode to activate the song interval detection circuit described later. 15 to the operating state.

Reference numeral 13 designates a second locking lever that is pivotally supported on the main board 1 by a shaft 1c between the head board 2 and the high-speed feed lever 8, and has a lock at one end that can be engaged with the lock pin 2b on the head board 2. It has a claw 13a and is brought into contact with the contact pin 8b of the high-speed feed lever 8 by rotation in the direction of arrow K due to the biasing force of a spring 14 whose other end is suspended between the main board 1 and the main board 1.

Now, in the present invention, the magnetic head 3, the magnetic solenoid 5, the inter-track detection mode switch 1
2, the inter-song detection circuit 15, etc. are connected in a circuit as shown in FIG.

That is, when the playback switch 16 is turned on by operating a playback button (not shown), the one-shot pulse generator 17 outputs a one-shot pulse to the flip-flop (hereinafter referred to as
(referred to as FF) 18 is set, and a reproduction mode signal is output from its output terminal Q to operate the electromagnetic solenoid 5. The operation of the electromagnetic solenoid 5 moves the head board 2 to the playback position and turns on the switch 23, putting the tape recorder into playback mode.

Therefore, the reproduction signal from the magnetic tape T picked up by the magnetic head 3 at this time is transmitted to the reproduction circuit 19.
It reaches the speaker drive circuit 20 through the speaker 21
drive.

In this playback mode, when the high-speed feed lever 8 is pressed and the song interval detection switch 12 is turned on, a one-shot pulse is output from the one-shot pulse generator 24 to reset the FF 18 and output from the output terminal Q. The output is deenergized to stop the operation of the electromagnetic solenoid 5.

On the other hand, in conjunction with the turning on of the song interval detection switch 12, the +B power is applied to the song interval detection circuit 15, and the circuit 15 becomes operational, and the song interval detection effect in the reproduced signal obtained from the reproduction circuit 19 is activated. Execute. When a song interval is detected, a reproduction mode return signal consisting of a single pulse is output from the song interval detection circuit 15 through the line 25, and the FF 18 is set again to energize the electromagnetic solenoid 5 to return to the reproduction mode. It is structured as follows.

<Operation of the present invention> The present invention is constructed as described above, and its operation will be explained below.

Now, in the stop mode shown in FIG.
18, the FF 18 is set to a set state, and a reproduction mode signal is output from the output terminal Q.

Then, the electromagnetic solenoid 5 operates in response to this regeneration mode signal and attracts the movable iron core 6 in the direction of arrow L.

In conjunction with this suction of the movable iron core 6, the regeneration lever 7 rotates in the direction of the arrow C, and moves the head board 2 forward from the stop position in the direction of the arrow A via the engagement pin 2a, thereby connecting the magnetic head 3 and the magnetic head 3. Move to the playback position where the tape T is in complete contact.

As the head board 3 moves forward, the switch 23 with the actuator 23a located within its movement path is turned on, supplying the reproducing circuit 19 with the operating voltage of the +B power supply.

On the other hand, in conjunction with the suction of the movable iron core 6, the first locking lever 10 is rotated in the direction of arrow H against the spring 11, and its lock claw 10a locks the lock pin 8a of the high-speed feed lever 8. move it to an impossible position.

Now that the tape recorder is in the playback mode shown in FIG. 2, the magnetic tape T runs at a constant speed by the operation of the tape constant speed drive mechanism (not shown), and is picked up from the magnetic tape T by the magnetic head 3. The reproduced signal is applied from the reproduction circuit 19 to the speaker 21 via the speaker drive circuit 20, and is emitted as sound.

Of course, at this time, the playback signal is also supplied from the playback circuit 19 to the inter-song detection circuit 15, but since the inter-song detection mode switch 12 is not turned on, the inter-song detection circuit 15 receives the drive voltage from the +B power supply. Therefore, the inter-track detection operation is not performed.

Next, a case will be described in which the mode is switched from the playback mode as described above to the song interval detection mode.

In the playback mode shown in FIG. to rotate in the direction of arrow K and move the lock pawl 13a to a position where it can engage with the lock pin 2b on the head board 2.

When the high-speed feed lever 8 is further pushed in, the tip of the lever 8 comes into contact with the actuator of the inter-music detection mode switch 12, turning on the inter-music detection mode switch 12.

Then, when the inter-music detection mode switch 12 is turned on, the one-shot pulse generator 24 outputs a one-shot pulse, resets the FF 18, and deactivates the reproduction mode signal from the output terminal Q.

When this regeneration mode signal is deenergized, the electromagnetic solenoid 5
stops its operation, and moves the movable iron core 6 back in the direction of arrow M by the force of a return spring (not shown).

Coupled with the return movement of the movable iron core 6, the head board 2 is moved back from the regeneration position to the stop position by the spring 4, and during this movement, the lock pin is attached to the lock pawl 13a of the second locking lever 13. 2b is locked and stopped at the inter-track detection position. On the other hand, the first locking lever 10 is rotated back in the direction of arrow G by the spring 11, and the locking pawl 10a locks the locking pin 8a of the high-speed feed lever 8, thereby locking the lever 8 in the operating position.

Further, when the song interval detection mode switch 12 is turned on, an operating voltage is supplied from the +B power supply to the song interval detection circuit 15, and the song interval detection circuit 15 enters the song interval detection operation state.

Now that the tape recorder is in the inter-track detection mode, the magnetic tape T is run at high speed by a high-speed tape drive mechanism (not shown), and the playback signal is picked up by the magnetic head 3 that is in light contact with the magnetic tape T. is supplied from the reproduction circuit 19 to the song interval detection circuit 15.

The song interval detection circuit 15 searches for a song interval on the magnetic tape 3 based on the supplied reproduction signal, and when detecting a song interval, outputs a reproduction mode return signal to set the FF 18 to the set state again.

When the FF 18 returns to the set state, the electromagnetic solenoid 5 is again supplied with the regeneration mode signal and operates to attract the movable iron core 6 in the direction of the arrow L.

Based on this, the reproducing lever 7 rotates in the direction of arrow C to return the head board 2, which was at the song interval detection position, to the reproducing position shown in FIG. 2, and the first locking lever 10 rotates in the direction of arrow H. The high speed feed lever 8 is rotated to unlock the lock pin 8a of the high speed feed lever 8, and the high speed feed lever 8 is returned to its original non-operating position by the return force of the spring 9.

In conjunction with the return of the high-speed feed lever 8, the song interval detection mode switch 12 is turned off to cut off the power supply path to the song interval detection circuit 15, rendering the circuit 15 inactive.

As a result, the tape recorder returns to the playback mode again, and the playback signal from the magnetic tape T is emitted from the speaker 21.

<Effects of the present invention> Since the present invention is configured as described above, one electromagnetic solenoid can move the tape recorder from stop mode to playback mode, from playback mode to inter-track detection mode, and between-track detection mode. This is an excellent idea that can provide an extremely practical tape recorder that can switch modes from playback mode to playback mode.

[Brief explanation of drawings]

1 to 3 are operation state diagrams showing the stop, playback, and song interval detection modes of a tape recorder equipped with an embodiment of the mode switching device according to the present invention, and FIG. 4 is the mode switching device according to the present invention. FIG. 2...Head board, 3...Magnetic head, 5...
Electromagnetic solenoid, 6...Movable iron core, 8...High speed feed lever, 10...First locking lever, 12...
Song interval detection mode switch, 13...second locking lever.

Claims (1)

[Scope of utility model registration request] Can reciprocate back and forth, stopping position in stop mode,
It is possible to take the playback position in playback mode and the inter-track detection position that is a little backwards from this playback position, and the head board, which is always energized toward the stop position, and the movable iron core when energized, are attracted through the playback lever. an electromagnetic solenoid that moves the head board from a stop position to a regeneration position to obtain a regeneration mode; a high-speed feed lever that can reciprocate between a non-operation position and an operation position and is always energized in the direction of the non-operation position; is in a position where it can lock the high-speed feed lever pressed to the operating position, and when the movable iron core is attracted by energizing the electromagnetic solenoid, a first locking mechanism takes a position in which it cannot be locked in response to the movable iron core. a lever, a second locking lever that responds to the high-speed feed lever and assumes a position where the head board can be locked in the song interval detection position when the high-speed feed lever moves back to the operating position; and the high-speed feed lever is operated. It consists of a song detection mode switch that cuts off the energization to the electromagnetic solenoid when the head board is in the playback position. When the lever is pressed and moved forward to the operating position, the operation of the song interval detection mode switch cuts off the power to the electromagnetic solenoid, and the first locking lever locks the high-speed feed lever in the operating position. A mode switching device for a tape recorder that locks a head board at a track interval detection position using a second locking lever to enter a track interval detection mode.