JPS634305Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to minute feed and rapid feed of a pick-up feed device used to read information signals from a rotating disk.

Conventionally, the minute feed and rapid feed devices for pick-up mounts varied the rotational speed of the motor. In this case, the disadvantage was that the motor's rotational speed was suddenly increased, resulting in unreasonable use beyond the rated value, or the motor's rotational speed was reduced to a very low speed, resulting in unstable torque.

The present invention was devised to eliminate the above-mentioned drawbacks, and the embodiment shown in the drawings will be described as follows.
As shown in FIGS. 2 and 3, the shaft 17 is rotated by the motor, and the drive pulley 13 is rotated in the direction of arrow A. The rotational force drives pulleys 10 and 12 by drive belt 14. pulley 10
The diameter of pulley 9 and pulley 12 which rotate coaxially with
A belt 7 that connects pulleys 9 and 16 with the same diameter as the pulley 11 that rotates coaxially.
and belt 8 that connects pulley 11 and pulley 15.
The running direction of the pick-up mounting base 1 is different.
A stepped wheel 2 rotatably mounted on the lower surface of the wheel is formed into two stages, a pulley with a large radius R1 and a pulley with a small radius R2, and a belt 7 running in the C direction is attached to the outer peripheral surface of the small radius R2 pulley to the left and right. The belt 8 running in the direction B is pressed against the outer circumferential surface of the large radius R1 pulley opposite to the outer circumferential surface of the large radius R1 pulley by tension pulleys 5 and 6 disposed on the left and right. At the same time, the pulley 9 or 11 is rotated by the rotational speed difference, and the mounting base 1 is slightly fed, and the pulley 9 or 11 is rotated on the shaft 20 by rotating the lever 25 that locks the tip in the outer peripheral groove of the pulley 9 or the pulley 11. Then move it up and down, and when moving it down, use the friction pad 23,
24 to drive the pulley 9 or pulley 10, and when moving it upward, the friction pads 21, 22
This is a pick-up moving device that isolates and stops the pulley 9 or pulley 10.

Since the present invention has the structure described above,
When the belts 7 and 8 run at V/sec, the number of revolutions of the tray wheel 2 obtained by the belt 7 is V/sec.
It rotates in the E direction with 2πR2/2 rotations, and the number of revolutions of the tray wheel 2 obtained by the belt 8 is V/2πR1/second.
It rotates in the E direction in two revolutions, and therefore the tray wheel 2 rotates in V/2πR2+V2πR1/2 revolutions. Therefore, when the mounting base 1 is slightly fed in the D direction at V-2πR1V/2π(1/R2+1/R1)/2 and the pulley 9 is moved upward and the pulley 9 is stopped, the belt 7 is stopped and the mounting base 1 is Fast forward movement in direction B at a speed of V/2・R2/R1.

Also, when the pulley 11 is stopped, the belt 8 is stopped, and the mounting base 1 is rapidly moved in the C direction at a speed of V/2.R1/R2. Furthermore, when the belts 7 and 8 are stopped, the movement of the mounting base 1 is stopped.

As mentioned above, the present invention regenerates one side of an audio disk over an hour, and in order to stabilize the minute feed and make the recovery time possible in a few seconds, two types of belts are run in different directions, and each The speed difference is utilized by changing the radius of the stage wheel 2 to which the belt is crimped, and making the speed different.The motor always rotates within the rated range and stable torque can be obtained, and a large speed ratio can be achieved, so that small speed changes can be achieved. This is possible by changing the rotation speed of the motor, and it is an excellent idea with a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the present invention Fig. 2 is a pulley 9,
10 or a cross-sectional view of pulleys 11 and 12. FIG. 3 is a cross-sectional view of the stepped wheel 2, where 1 is a mounting base, 2 is a stepped wheel, and 7 and 8 are belts.

Claims (1)

[Scope of utility model registration request] Stage car 2 with belt hooks of different diameters
A pick-up moving device that slightly feeds a pick-up mount 1 to which the shaft of a tray wheel 2 is attached by suspending belts 7 and 8 running in opposite directions at equal speeds.