JPS6035721B2 - Pickup arm lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lifting device for a pickup arm having a cartridge at its tip, and its purpose is to reduce the outflow of viscous fluid and prevent the needle tip from dropping rapidly due to the pickup arm. An object of the present invention is to provide a pickup arm lifting device that can prevent damage to the pickup arm.

Generally, as shown in Fig. 1, a pickup arm lifting device is equipped with an IJ foot arm 4 for raising and lowering a pickup arm 3 at the tip of a bearing 2 mounted on a shield on a base plate 1, or a foot shaft 5 is mounted on the bearing 2 to lift the A biasing spring 7 is interposed between a retaining ring 6 provided at the lower end of the shaft 5 to elastically bias the IJ shark 5 in the downward direction at all times, and the bearing 2
A viscous fluid is interposed between the substrate 1 and the actuating cam 8 provided at the upper end of the IJ foot shaft 5 to apply a braking force to the urging force of the urging force 7. By engaging with the rotating cam 9 which is supported on the rotation arm 9 and rotating the foot lever 10, the l
j The foot arm 4 was made to move up and down.

However, in the above-mentioned pickup arm device, since viscous fluid is sealed between the IJ foot shaft 5 for raising and lowering the pickup arm 3 and its bearing 2, the viscous fluid is There were many leaks, and there were problems with reliability. In other words, as the number of vertical movements of the foot shaft 5 increases, the amount of viscous fluid that flows out increases. There was a risk of damaging the stylus tip of the pickup arm cartridge. The present invention solves the drawbacks of such conventional systems, and will be described below with reference to drawings of embodiments.

FIG. 2 shows one embodiment of the pick-up arm lifting device of the present invention. In the figure, 41 is a lift means for lifting and lowering the pick-up arm, and
It consists of a metal bearing 12 which is welded and fixed to 1a, a foot shaft 13 which is supported by the above-mentioned end barrel bearing 12, and the like.

The lift shaft 13 has a pickup arm 14 at its tip.
A lift arm 15 for raising and lowering is fixed, and a retaining ring 16 is fixed to its lower end. The lift ball 13 is elastically biased in the downward direction by a spring 18 inserted between the catch seat 17 supported by the retaining ring 16 and the terminal bearing 12. Further, the lift shaft 13 has a cam 19 fixed to the upper side of the end barrel bearing 12, and a protrusion 19a provided on the cam 19 penetrates the base plate 11 and projects downward. Reference numeral 42 denotes a rolling cam means for operating the lift means 41; It is composed of a rotating force 21 and the like provided at a wheel 22.

A knob 24 having a lift lever 23 is fixed to one end of the rotating shaft 20. The rotating cam 21 of the rotating force means 42 is rotated by the spring 26 of the auxiliary substrate 25 provided on the substrate 11 and the horizontal rotation means 43.
It is connected to the protruding piece 19a of No.9. Here, the horizontal rotation means 43 is equipped with an actuating plate 27, and the actuating plate 27
As shown in FIG. 3, it is attached to a cylindrical shaft 29 that is mounted on a horizontal shaft 28 that is screwed to the auxiliary board 25.
Three streams of viscous fluid sealed between the horizontal shaft 28 and the cylindrical shaft 29 provide a buffering effect. One end of the actuating plate 27 is loosely attached to the projecting piece 19a of the cam 19, and the other end is connected to the rotary force ram 27 via a counter 26 supported by the support shaft 31 of the auxiliary board 25. is related to. Further, the spring 26 has its own elastic force so that its respective ends are supported by the rotation arm 21 and the actuating plate 27.
In the pickup arm lifting device having such a configuration, when the lift lever 23 is pushed up from the solid line position to the broken line position and the rotation arm 21 is rotated to the broken line position as shown in FIG. 4, the spring 26 is compressed. Horizontal rotation means 43
The operating plate 27 is rotated by receiving a clockwise rotational force due to the biasing force of the spring 26.

At this time, since the viscous fluid 30 is sealed between the horizontal shaft 28 and the cylindrical shaft 29 of the horizontal rotation means 43, the actuating plate 2
7 rotates slowly clockwise. When the actuating plate 27 rotates clockwise, the actuating plate 27 moves toward the lift shaft 13.
The lift shaft 13 is raised together with the cam 19 in order to be connected to the cam 19 provided at the pickup arm 1.
4 is lifted up gently. The spring 18 is compressed in conjunction with the movement of the lift shaft 13. On the other hand, when the lift lever 23 is lowered from the broken line position to the solid line position as shown in FIG. The shaft 13 is pushed down by the biasing force of the spring 18.

At this time, the IJ foot shaft 13 does not descend rapidly because the cam 19 provided thereon is in contact with the operating plate 27, but gradually descends due to the resistance force of the viscous fluid of the horizontal rotation means 43. When the lift shaft 13 descends, the lift arm 15 at the tip of the lift shaft 13 descends to lower the pickup arm 14, and at the same time, the actuating plate 27,
Return the spring 26 to its original position. As described above, according to the present invention, the horizontal rotation means filled with viscous fluid connects the IJ lift means for raising and lowering the pickup arm and the spreading cam means for operating the lift means. This makes it possible to reduce the amount of viscous fluid that flows out due to frequency of use, thereby preventing damage to the needle tip due to sudden descent of the pickup arm, and improving the reliability of the device itself. can significantly improve performance. Further, by providing a horizontal rotation means separately, attachment and detachment can be easily performed and repair serviceability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part of a conventional pickup arm lifting device, and FIG. 2 is a sectional view of a pickup arm lifting device of the present invention.
FIG. 3 is a sectional view taken along the line A-A in FIG. 2, and FIG. 4 is a diagram illustrating the operation of the main part of the apparatus. 11... Board, 12... Bearing, 13...
...Lift axis, 14...Pickup arm, 1
5...Lift arm, 16...Keeping ring, 17...
...Catch, 18...Spring, 19...Cam, 19a...Protrusion, 20...Rotation shaft, 21...Rotation force arm, 2
3... Lift lever, 25... Auxiliary board, 26... Spring, 27... Actuation plate,
28...Horizontal axis, 29...Cylindrical axis, 3
0...Viscous fluid. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A horizontal rotating means is provided, in which a viscous fluid is sealed between a horizontal shaft and a cylindrical shaft fitted thereto, and an actuating plate is provided on either one of the horizontal rotating means, and a pick-up is provided at one end of the actuating plate. A cam provided on a lift shaft for raising and lowering the arm is brought into contact with the arm, and a rotating cam rotated by the operation of a lift lever is connected to the other end via a compression spring, and the arm is connected to the lift shaft in the downward direction. A pick-up arm lifting device characterized by applying a biasing force.