JPS5927003B2 - static record playing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stationary record playing device that performs a performance (hereinafter referred to as play) by placing it on a stationary record, and when a pause is made (hereinafter referred to as pause), the device automatically The purpose of this system is to protect the record and needle by housing the pickup inside the playing device.

In the pause operation of a conventional stationary record player, the power to the motor and amplification circuit is cut off while the stylus is in pressure contact with the record during play.

However, in the above-described method, if the stationary record player is removed from the record while in the paused state, the needle remains protruding, so there is a great risk of damage to the record and the needle. The present invention solves this conventional drawback, and one embodiment of the static record playing device of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the playing state of the drive section of the stationary record playing device of the present invention, where 1 is a record and 2 is a mount on which the record is stuck.

3 is a motor, 3-a is a motor shaft, 4 is an idler that decelerates and rotates and transmits the rotation of the motor shaft 3-a, and this idler 4 is inserted into a shaft 6 installed in an idler base 5, It is biased in the direction of arrow A by a tension spring 7.

9 is a turntable 11 that receives the rotation from the idler 4.
It is a pulley that transmits transmission to the turntable shaft 8, and is fixed non-rotatably to the turntable shaft 8.

Reference numeral 10 denotes a record guide having both the function of positioning with the record 1 and the function of placing a driving member.

As is clear from the circuit diagram in the playing state shown in FIG. 5, 12 is a record detection switch which is connected in parallel with the pickup 33 and has the function of shorting the signal to set the output to zero and eliminate noise.

The record detection switch 12 is fixed to the turntable 11 with a screw 13. 14 is the record detection lever (
(hereinafter referred to as a detection lever), and the shaft 14d of the record detection lever 14 is mounted on the bearing stand 11a of the turntable 11.
is fitted loosely, and is configured to allow seesaw movement using this as a fulcrum.

The detection lever 14 is prevented from floating upward by a brush stand 39, as shown in FIG. Since the lower surface of the detection lever 14 is in contact with the lower terminal 12-a of the record detection switch 12, it is constantly urged counterclockwise by the elastic force of the lower terminal 12-a. Since the lower surface of the U-shaped portion 14-a of the record detection button 14 is in contact with the tip of the button guide 15-a of the record detection button (hereinafter referred to as detection button) 15 shown in FIG. It is becoming. Also, the tip boss 14- of the detection lever 14
c is the locking cam 1 shown in FIG. 2 as described later.
The locking cam 18 is brought into contact with the lower end surface 18-c of the turntable 11 by the rotational force of the turntable 11, and the locking cam 18 is released from the locking pin 37 to release and lower the switch mechanism and the lift plate located at the upper position. It is something. Further, as will be described later, the boss 14-b of the detection lever 14 comes into contact with the lower surface of the lift plate 35 shown in FIG.
4 is rotated clockwise in FIGS. 2 and 3 against the force of the lower terminal 12-a of the detection switch 12 to open the detection switch 12. 16 is a lift slide plate extending from the lift plate 35; 17 is a slide pedestal for the lift slide plate 16;
7 is fastened and fixed to the record guide 10.

Reference numeral 18 designates the aforementioned locking cam, which is formed of a known hard cam and is loosely fitted onto the shaft 21 of the chassis 22.

The chassis 22 serves as a base for attaching each part of the switch mechanism and lift mechanism. The locking cam 18 is always urged by a torsion spring 20, and rotation in the counterclockwise direction (direction of arrow B) by the torsion spring 20 is caused by a stop pin 1 fixed to the chassis 22.
9 and is regulated by the stop pin 19, the detection lever 14 is positioned so as to come into contact with the tip post 14-c of the detection lever 14, which is moved by the rotation of the turntable 11. Further, the locking cam 18 is urged against the surface 22-a of the chassis 22 by the compression coil portion 20-a of the torsion spring 20. On the other hand, the locking cam 18
can also rotate in the direction of arrow C about the fulcrum 18-d of the locking cam 18. Reference numeral 24 designates a switch operating plate, and as shown in FIG. 2, a switch pressing plate 25 and a play button 23 are press-fitted into the upper L-shaped bent portion.

Further, a switch operating plate rack 29 (hereinafter referred to as an operating plate rack) is fastened to the side surface of the switch operating plate 24. It is constantly biased upward by a tension spring mounted between b. 3
0 is a pinion that is pivotally supported by the chassis 22, meshes with the operating plate rack 29 and the lift rack 31, and transmits the vertical movement of the switch operating plate 24 to the lift rack 31 in reverse.

The lift rack 31 is fastened to the lift slide plate 16 with screws 32. Therefore, it has the function of reversing and converting the vertical movement of the switch operating plate 24 to the lift plate 35. 26 is a power switch, which is attached to a printed circuit board 27 on which circuit components are mounted.

26-a is an actuator of the power switch 26;
When the tip is pressed by the lower surface of the switch press plate 25, the upper and lower terminal plates 261b and 26- of the power switch 26 are pressed.
c is configured to close.

The above is a description of the configuration, and now the operation will be explained. Second
The figure is a longitudinal section showing the same play state as in Figure 1, and the switch operating plate 2 has already been activated by the downward operation of the play button 23.
4 is moved downward, and the locking pin 37 fitted and fixed to the lower end of the switch operating plate 24 slides on the dovetail cam slope 18-a of the locking cam 18, and...
It is inserted into b. For this reason, the actuating plate rack 29 moves downward against the tension spring 28, and the pinion 30 meshing with it rotates clockwise, and furthermore, the pinion 30
The lift truck 31 that is engaged with the holder is reversed and moved upward.
Therefore, the lift slide plate 16 fastened to the lift rack 31 also moves upward, and the lift plate 35 fixed to the lower L-shaped bent portion of the lift slide plate 16 is also held in an upwardly moved state. At this time, pick up 3
There is a gap G-1 between the contact arm 33-c of No. 3 and the lower surface of the lift plate 35, and the pickup 33 is rotatably attached to the turntable 11 via a shaft 34. Since the pickup 33 is configured to be able to tilt up and down using the hinge portion 33-b as a fulcrum, it is released from the lift plate 35 in this state. Therefore, the pickup 33 is inclined by the gap G-1, and the needle 33-a is brought into pressure contact with the record 1. On the other hand, the record detection button 15 moves upward to come into contact with the top surface of the record 1, and the U-shaped portion 14-a of the detection lever 14
This will push up the bottom of the. For this reason, the detection lever 14
is the lower terminal 12 of the detection switch 12 with the shaft 14d as the fulcrum.
-a rotates clockwise against the elastic force, opening the upper terminal 12-b and lower terminal 12-a of the detection switch 12. Furthermore, since there is a gap G-2 between the tip boss 14-c of the detection lever 14 and the lower end of the locking cam 18, the tip boss 14-c does not come into contact with the locking cam 18, and Since the boss 14-b of the detection lever 14 is also opened with a gap G-3 between it and the lower surface of the lift plate 35, the turntable 11 rotates without any hindrance and a play operation is performed. In the play state shown in FIG. 2, the pause switch 43 shown in FIG.
When switching to the 3-B contact, the DC power is connected to the capacitor 40.
Since the signal is cut, the amplifying circuits 41 and 42 are turned off.
Furthermore, since the aforementioned detection switch 12 is open, the brush 38 and the slip ring 36 are electrically connected, but the motor 3 naturally stops. In this state, any Bose is performed. In this state, pick up 3
The hand 331a of No. 3 is stopped while being pressed against the record 1, so the driving state diagram in the pause state is the same as the play state in FIG. 2 except that the pause switch 43 has been switched. .

FIG. 3 shows a state in which the playing device has been separated from the record 1 from the pause state, and since the pick-up 33 is tilted at X, the needle 33 is moved from the lower end surface P of the record guide 10.
The a stands out and becomes an X.

Therefore, as soon as the performance device is removed, it is necessary to automatically store it inside the record guide 10 from the lower end surface P. Next, the storage operation will be explained. When the performance device is removed from the record 1, the detection button 15 is released. Therefore, the detection lever 14 is rotated counterclockwise about the shaft 14-d by the elastic force of the lower terminal 12-a of the detection switch 12, and the detection button 15 is moved downward. Therefore, the tip end boss 14-c of the detection lever 14 is also connected to the detection switch 1.
2 moves upward due to the elastic force of the lower end 12-a of the locking cam 18, and as a result, an overlap H that can come into contact with the lower end surface 18-c of the locking cam 18 is created. Further, the detection switch 12 is closed because the lower terminal 12-a contacts the upper terminal 12-b due to its elastic force. Therefore, the pickup signal is short-circuited and the output becomes zero. In other words, noise can be eliminated. Brush 38″ at the same time
, the slip ring 36' becomes conductive, so that the brush 38
7. The motor 3 is connected in series to the power supply via the slip ring 36', the detection switch 12, the pause switch 43, and the power switch 26, and only the motor 3 that was temporarily stopped is started again. Then, the tip boss 14-c of the detection lever 14 comes into contact with the lower end surface 18-c of the locking cam 18 while the turntable 11 rotates within one rotation at maximum, and the turntable 1
The locking pin 37 of the switch operating plate 24 is
72. The hard cam striking portion 18b of the locking cam 18 is removed in the direction of arrow C in FIG. For this reason, the switch operating plate 24 is operated by the tension spring 28 shown in FIGS.
is pulled up, and the actuator 2 of the power switch 26
A gap is created between the tip end of 6-a and the switch pressing plate 25,
The power switch 26 is opened and the motor 3 is stopped again. At the same time, by upward movement of the switch operating plate 24, the vinyl 30
rotates counterclockwise to move the lift rack 31 downward. As a result, the lift plate 35 also moves downward, and the tip of the abutting arm 33-c of the pick-up 33 is moved downwardly by the lift plate 35.
5, the tilted pick-up 33 is rotated clockwise about the hinge 33-b, and raised to a horizontal position as shown in FIG. In this way needle 33
-a is stored inward from the lower end surface P of the record guide 10. As described above, the stationary record playing device of the present invention not only cuts off the power supply when performing a pause, but also immediately inserts the needle into the stationary record playing device when the stationary record playing device is removed from the record during the pause. Since it is designed to be stored, the record and needle can be reliably protected.

Also, if the brush and slip ring for transmitting the playback signal are used to supply power to the motor when the record is removed during the pause operation, there is no need to provide a special power supply line, which is advantageous. .

[Brief explanation of drawings]

FIG. 1 is a cutaway perspective view of a main part of a stationary record playing device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the same, and FIGS. FIG. 5 is a circuit diagram in a play state. 1...Record, 2...Record mount, 3...Motor, 4...Idler
9...Pulley, 10...Record guide, 11...Turntable, 12...
・Record detection switch, 14...detection lever, 15...detection button, 16...lift slide plate, 18...locking cam, 22...・
... Chassis, 23 ... Play button, 24
...Switch operating plate, 25...Switch pressing plate, 26...Power switch, 29...
... Operating plate rack, 30 ... Pinyon, 31
...Lift truck, 33...Pickup, 35...Lift plate, 36,36ζ
...Slip ring, 38,381...
Brush, 39... Brush stand, 41, 42...
...Amplifier, 43...Pause switch.

Claims (1)

[Claims] 1. In a stationary record playing device in which a pickup is pivotally mounted on a turntable rotationally driven by a motor, and a record is played by tracing a stationary record with the pickup, A pause switch that temporarily stops the record playing by turning on and off the power, and a pause switch that controls the pickup and rotates the motor to bring the pickup pivotally attached to the turntable into contact with the record to play the record. a locking cam mechanism that locks the rotational drive means; a record detection lever that detects whether a record is attached or removed; and a record detection lever that closes when the record is removed in synchronization with the record detection lever, and is connected to the motor. and a record detection switch that supplies power to the pickup, and when the record is removed from the pickup while the pause switch is switched to the pause side while the record is being played, the record detection lever is activated to prevent the record from being removed. is detected, and the record detection switch rotates the motor.
Due to the rotational force of the motor, a portion of the record detection lever comes into contact with the lower end of the heart cam plate of the locking cam mechanism that locks the rotation drive means, thereby releasing the lock and storing the pickup within the main body of the performance device. A static record playing device characterized by: 2. A record detection switch is connected between two output terminals of the pickup, and when the record detection switch is closed when the record is removed, the output signal of the pickup is short-circuited. stationary record playing device. 3 Install a record detection switch on the turntable,
It is configured to transmit the output signal of the pickup to an electric circuit provided in the main body of the performance device via a brush and a slip ring, and when the record is removed with the pause switch set to the pause side, the pause switch is activated. A stationary record playing device according to claim 1, wherein power is supplied to the motor via the record detection switch, the brush, and the slip ring.