JPS6217293B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to an automatic music selection device for a tape recorder, and its purpose is to utilize the power of a flywheel when a silence detector detects a no-signal portion of a recorded magnetic tape. The present invention provides an automatic music selection device for a tape recorder that is free from malfunctions when the high-speed reproduction state of the magnetic tape is canceled and the magnetic tape is automatically switched to the constant-speed reproduction state.

Generally, an automatic music selection device of a tape recorder puts a recorded magnetic tape into a high-speed playback state, and in this high-speed playback state, a silence detector detects a non-signal portion of the magnetic tape, and a detection signal from the silence detector is used. Then, an electromagnet is driven to cancel the high-speed reproduction state of the magnetic tape, and the magnetic tape is automatically switched to a constant-speed reproduction state. Then, switching the magnetic tape from the high-speed playback state to the constant-speed playback state uses the power of the flywheel to cancel the high-speed playback state,
I am trying to create a constant speed playback state. However, as mentioned above, in the mechanism that uses the power of the flywheel to cancel the constant speed regeneration state, the suction time of the electromagnet is set appropriately, so depending on the timing, the power of the flywheel may be used to enter the high speed regeneration state. There was a problem of malfunction in which the release mechanism was struck twice and the magnetic tape was switched from the constant speed playback state to the stop state.

The present invention eliminates such conventional drawbacks, and the present invention will be described below with reference to drawings of embodiments.

FIG. 1 shows one embodiment of the automatic music selection device of the present invention, in which 1 is a play button, 2 is a fast forward button, 3 is a rewind button, 4 is a play lever, 5 is a fast forward lever, and 6 is a fast forward button. This is the rewind lever. Each of the levers 4, 5, and 6 is slidably attached to the frame 7, and is constantly biased in the direction of the arrow A shown in the figure by a spring (not shown) bridged between the levers 4, 5, and 6. There is. A lock plate 8 is slidably supported by the frame 7, and is constantly biased in the direction of the arrow (R) shown in the figure by a spring 9 suspended between the lock plate 8 and the frame 7. The lock plate 8 has an engaging pawl 1 that is engaged with locking pieces 4a, 5a, and 6a provided on the levers 4, 5, and 6, respectively.
0, 11, 12, and the regeneration lever 4
The engaging pawl 10 that is engaged with the locking piece 4a is slightly longer than the engaging pawls 11 and 12 that are engaged with the locking pieces 5a and 6a provided on the fast forward lever 5 and the rewind lever 6, respectively. When the playback lever 4 and the fast forward lever 5 or the rewind lever 6 are engaged in combination with the lock plate 8, the engagement claw 10 engages the locking piece 4a more deeply than the engagement claws 11 and 12. engage. A movable plate 13 is slidable using guide pins 14 and 15 provided on the frame 7 as a guide, and a substantially L-shaped lever 16 is provided so as to be rotatable about a support shaft 17 . The movable plate 13 is always biased in the direction of the arrow A shown in the figure by a spring 18 that is bridged between it and the frame 7, and the lever 16 is biased by the spring 1 fitted to the support shaft 17.
By locking one end of the lever 9 to the guide pin 14 and locking the other end to one piece 16a of the lever 16, the lever 16 is always biased counterclockwise. The sliding plate 13 is provided at a position where the tips of the fast-forwarding lever 5 and the rewinding lever 6 come into contact, and the lever 16 is provided at a position where the tip of the playback lever 4 comes into contact with one piece 16a thereof. ing. Reference numeral 20 denotes a changeover switch operated by the other piece 16b of the lever 16, and is attached to the frame 7 so as to correspond to the lever 16. Reference numeral 21 denotes a flywheel rotatably supported by the frame 7, and is driven to rotate by a belt 22 stretched between it and a motor (not shown). The flywheel 21 is provided with an operating pin 23 at a position away from its center of rotation, and one end of an operating lever 24 pivotally supported on the frame 7 is associated with the operating pin 23 . The actuating lever 24 is always urged to rotate clockwise by a spring 25 that is bridged between the actuating lever 24 and the frame 7. Reference numeral 26 denotes an electromagnet attached to the frame 7, and one end of an actuating lever 28 pivotally supported on the frame 7 is coupled to the tip of its actuating rod 27. Then, the activation lever 28
The other end corresponds to the actuation lever 24. Reference numeral 29 denotes a stroke converting member rotatably provided on the lock plate 8 by a support shaft 30, and is constantly biased to rotate counterclockwise by a spring 31 spanned between the lock plate 8 and the lock plate 8. . The stroke converting member 29 is provided with two engaging recesses 32 and 33 at its tip, and operates when the locking plate 8 moves in a direction opposite to the direction of arrow B in the figure against the biasing force of the spring 9. The engagement position of an engagement claw 34 provided at the tip of the lever 24 is changed. Reference numeral 35 denotes a stopper piece provided on the frame 7 corresponding to the stroke converting member 29, and when the lock plate 8 moves in the direction opposite to the direction of arrow B in the figure against the biasing force of the spring 9, the stroke is changed. The stroke converting member 29 is rotated clockwise against the biasing force of the spring 31 by coming into contact with a protrusion 36 provided on the converting member 29 .

FIG. 2 is a circuit diagram of the automatic music selection device of the present invention, in which a signal from a magnetic head 42 in contact with a recorded magnetic tape 41 is amplified by an amplifier 43 and applied to a silence detector 44. This silence detector 4
4, when the magnetic tape 41 is in a high-speed reproduction state, the signal from the magnetic head 42 in contact with the magnetic tape 41 is amplified by the amplifier 43 and is applied. It operates to detect a silent portion in a signal and apply power to the coil 45 constituting the electromagnet 26 in response to the detected signal. Then, the changeover switch 20
The movable contact piece 20-1 is connected to the silence detector 44, one fixed contact piece 20-2 is connected to the coil 45, and the other fixed contact piece 20-3 is in an open state. Then, the termination detection switch 46
A power source is connected to the coil 45 via the coil 45.

In such a configuration, as shown in the figure, by pressing both the playback button 1 and the fast forward button 2 (or rewind button 3), the locking pieces 4a provided on the respective levers 4 and 5 (or 6) are pressed. , 5a (or 6a) are engaged with the locking claws 10, 11 (or 12) of the lock plate 8, and the magnetic tape 41 is in a high-speed playback state. Rotate the lever 16 on the movement 13 clockwise against the biasing force of the spring 19,
Also, the above-mentioned fast forward lever 5 (or return lever 6)
At the tip, the sliding plate 13 is moved in a direction opposite to the direction of the arrow A shown in the figure against the biasing force of the spring 18.
Therefore, the changeover switch 20 is switched by the other piece 16b of the lever 16, and the electromagnet 26 is connected to the silence detector 44. Note that the changeover switch 20 is switched only when both the playback button 1 and the fast forward button 2 (or the remand button 3) are pressed, and when each of the playback button 1, fast forward button 2, and remand button 3 is pressed individually. When this happens, the other piece 16 of the lever 16
b cannot be brought into contact with the movable contact piece 20-1 of the changeover switch 20, and therefore cannot be switched. In the above-described high-speed reproduction state, when the silence detector 44 detects a silent portion of the magnetic tape 41, the silence detector 44 switches the coil 45 of the electromagnet 26 via the changeover switch 20.
When power is applied to the electromagnet 26, the actuating rod 27 is attracted to the electromagnet 26. When the actuating rod 27 is attracted, the actuating lever 28 rotates counterclockwise, and the actuating lever 24 is rotated counterclockwise by the biasing force of the spring 25. At this time, one end of the operating lever 24 is connected to the flywheel 21.
The actuating lever 24 moves into the locus of one rotation of the operating pin 23 provided in the flywheel 21 and rotates the flywheel 21.
is rotated counterclockwise by the power of Due to such rotational movement of the operating lever 24, the engagement claw 34 at the tip thereof engages with the first engagement recess 32 of the stroke converting member 29 provided on the lock plate 8. is moved in a direction opposite to the direction of arrow B in the figure against the biasing force of the spring 9, and only the fast-forward lever 5 (or return lever 6) is released from the locked state. Therefore, the magnetic tape 41 is automatically changed from a high speed playback state to a constant speed playback state. That is, when the actuating lever 24 engages with the first engagement recess 32 of the stroke converting member 29 and moves the lock plate 8, the stroke of the lock plate 8 changes to the engagement claw 11 (or 1).
2) and the locking piece 5a (or 6a), but it is insufficient to release the engagement between the engaging claw 10 and the locking piece 4a. , the regeneration lever 4 becomes a constant speed regeneration state. When the mode is automatically changed from the high-speed playback state to the constant-speed playback state in this way, the movable plate 13 is released from the engagement state by the fast-forward lever 5 (or return lever 6), so that the movable plate 13 Since the switch 18 moves in the direction of arrow A in the figure, the lever 16 can no longer hold the changeover switch 20 in the switching position.
The selector switch 20 is switched to disconnect the electromagnet 26 from the silence detector 44.
Therefore, the energization to the coil 45 of the electromagnet 26 is released, and the actuating lever 28 is also rotated clockwise in order to return the actuating rod 27 to its original position, and the actuating lever 24 is moved by the spring. It is rotated clockwise by the biasing force of 25, and one end thereof is moved out of the rotation locus of the operating pin 23 provided on the flywheel 21.

On the other hand, when the magnetic tape 41 reaches the end in the constant speed reproduction state, the end detection switch 46 is operated, so that the coil 45 of the electromagnet 26 is energized again, and the operating rod 27 of the electromagnet 26 is attracted. Therefore, the actuating lever 28 rotates counterclockwise, and the actuating lever 24 is moved by the spring 2.
Because it rotates counterclockwise against the biasing force of 5,
One end of the operating lever 24 enters within the rotation locus of the operating pin 23 of the flywheel 21, and the operating lever 24 is further rotated counterclockwise by the power of the flywheel 21. When the operating lever 24 is rotated by the flywheel 21 in this manner, the first stroke converting member 29
The engagement pawl 34 at the tip of the operating lever 24 engages with the engagement recess 32 and moves the lock plate 8 in the direction opposite to the direction of arrow B in the figure against the biasing force of the spring 9. The conversion member 29 contacts the stopper piece 35 and rotates clockwise against the biasing force of the spring 31, so that the engagement claw 34 at the tip of the operating lever 24 engages the stroke conversion member 33.
It comes to engage with the second engagement recess 33 of. Then, the operating pin 23 of the flywheel 21 comes into contact with the operating lever 24 again, and the operating lever 24 is brought into contact with the operating lever 24.
4 in the counterclockwise direction, the lock plate 8 is rotated counterclockwise against the biasing force of the spring 9 while being engaged with the second engagement recess 33 of the stroke converting member 29, in the opposite direction to the direction shown by the arrow B. In order to move in the direction, the engagement pawl 10 provided on the lock plate 8 and the regeneration lever 4
The mode is automatically changed to the stopped state by releasing the engagement with the locking piece 4a.

In the above embodiment, the actuating lever 2 is activated by energizing the electromagnet 26 using a termination detection switch.
In addition to this, one end of the magnetic tape 41 is inserted into the rotation locus of the operating pin 23 of the flywheel 21, but in addition to this, the tension of the magnetic tape 41 when it reaches the end is used to move the operating lever 24 or the starting lever 2.
8 may be operated to cause one end of the operating lever 24 to enter into the rotation locus of the operating pin 23 of the flywheel 21.

As described above, according to the present invention, the high-speed playback state of the magnetic tape is canceled by using the power of the flywheel with the electromagnet whose operation is controlled by the detector that detects the silent portion of the recorded magnetic tape. The high-speed feeding means is configured to activate an actuating member that automatically switches the magnetic tape to a constant-speed playback state, and includes a changeover switch that connects the silence detector to the electromagnet only when in the high-speed playback mode. Since the switch is actuated by a switch actuating means including a responsive moving plate and a lever rotatably supported on the moving plate and responsive to the reproducing means, the changeover switch is operated only in the high-speed reproducing mode, and the above-mentioned The silence detector can be disconnected from the electromagnet when the mode is changed from the high-speed playback state to the constant-speed playback state, and even if the silence detector controls the operation of the electromagnet for a long time, the power of the flywheel is maintained. 2.
This eliminates the possibility of errors occurring when changing the repeat mode, and allows reliable music selection operations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part of an embodiment of an automatic music selection device for a tape recorder according to the present invention, and FIG. 2 is a wiring diagram showing a circuit section of the same device. 1...Play button, 2...Fast forward button, 3...
...Rewind button, 4...Play lever, 5...Fast forward lever, 6...Rewind lever, 8...Lock plate, 13...Movement plate, 16...Lever, 20...
Changeover switch, 21...Flywheel, 24...
... actuation lever, 26 ... electromagnet, 28 ... starting lever, 29 ... stroke conversion member, 41 ... magnetic tape, 42 ... magnetic head, 44 ... silence detector, 46 ... end detection switch.

Claims (1)

[Claims] 1. A silence detector that detects silent portions of a magnetic tape in a high-speed playback state reproduced by the cooperation of a playback means that reproduces a playback state and a high-speed feed means that reproduces a high-speed feed state, and release means for transmitting the power of the flywheel to a stroke conversion member provided in the locking means for maintaining the regeneration state and the high-speed regeneration state by the locking means;
activation means including an electromagnet whose operation is controlled by the silence detector and activates the canceling means; and an activation means provided between the silence detector and the electromagnet, which causes the silence detector to act on the electromagnet only in the high-speed playback state. a changeover switch that is switched in conjunction with the reproducing means and the high-speed feeding means to connect;
A first position is biased by a spring in a direction opposite to the pushing direction by the high-speed feeding means, and a first position is moved backward by the spring biasing force, and a second position is pushed forward by the high-speed feeding means against the spring biasing force. a movable plate movable between positions; and a movable plate rotatably supported on the movable plate, and when the movable plate is in the first position, the changeover switch is also operated by a pushing operation of the reproducing means. a lever that assumes a first position when the movable plate is in a second position, and a lever that assumes a second position that cooperates with a pushing operation of the regeneration means to make the changeover switch operable when the movable plate is in a second position; The switch actuating means operates the changeover switch only in the high-speed playback state, and when the silence detector detects a silent portion of the magnetic tape, the electromagnet is energized and the activation means including the electromagnet causes the activation means to release the switch. and the release means cancels the high-speed regeneration state caused by the lock plate and changes the mode to a constant-speed regeneration state, and at the same time switches the changeover switch to cut off energization to the electromagnet. automatic music selection device for tape recorders.