JPS6018801A - Move-up/down device of pickup arm - Google Patents

Abstract

PURPOSE:To move up and down slowly a pickup arm by using the viscous resistance of a viscous matter to damp and absorb the movement of the iron core of a plunger and eliminating the shock sounds and shock vibrations. CONSTITUTION:An iron core 22 overcomes the force of a spring 23 and is attracted by an iron core holder 28 as soon as the switch of a plunger 25 is turned on to move a pickup arm down. In this case, the core 22 is slowly attracted by the viscous resistance of a viscous matter coated between a pipe 31 and the core 22. Therefore the core 22 hits the holder 28 at a low speed. As a result, neither shock sound nor shock vibrations are virtually produced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lifting device for a pickup arm of a record player.

Conventional configuration and its problems 2 pages.

When playing a record on a record player, it is necessary to lower the pickup gently to prevent the stylus from bouncing on the record and to prevent noise when the record is dropped. is considered essential.

This device can be roughly divided into those that are mechanically configured and those that are electro-mechanical conversion type.Here, we will discuss the electro-mechanical conversion type that does not use a motor or the like and uses an electromagnetic solenoid (hereinafter referred to as a plunger). The following describes a conventional pickup arm elevating device that applies a pickup arm.

Figure 1 shows a conventional pickup arm lifting device that uses a plunger. 1 is a cartridge, 2
3 is the pickup arm, stylus pressure is applied by balance weight 4, and 2 pairs of bearings 6.6
rotates vertically and horizontally, respectively. 7 is a bracket for attaching the pickup arm 3 to the record player body. 8 is a lift arm for raising the pickup arm 3 by 3 bases, and its height is finely adjusted by screws 9. A lift rod 10 supports the lift arm 8 and moves up and down. An operating cam 11 is press-fitted into a part of the lift rod 10, and moves up and down simultaneously with the cam 11. Reference numeral 12 denotes a plate supporting the lift section, which is fixed to the player body or the base (not shown) of the pickup so as to be movable.

Reference numeral 13 denotes a pipe that allows the lift rod 1o to move up and down smoothly and supports the lift rod 10, and is caulked to the plate 12.

Also, the inner diameter of the pipe 13 is designed to have an appropriate clearance so that it can operate without resistance. The spring 14 prevents the lift shaft 10 from pushing back in the direction of the arrow 16 (lowering the pickup arm) when the lift shaft 10 is pushed in the direction of the arrow 15.

1 is a connecting part for connecting with the cylinder 18 for slowing down, and 19 is a shaft, which is caulked by bending the plate 12 so that it does not move. The circular part at one end of the cylinder 18 is a pipe, and the shaft 19 is connected with a certain amount of clearance.
At the same time, a viscous substance such as silicone oil is applied to the clearance area, and as a result,
The cylinder 18 is configured to slowly rotate in the left-right direction as shown by an arrow 20 due to the viscous resistance of the viscous body. 21 is a contact piece attached to the tip of the plunger core 22, 23 is inserted between the washer 24 and the plunger body (or yoke) 25, and when the plunger core 22 is attracted, the plunger core 22 is connected to the cylinder. 18
It shows a spring that pushes up in the direction of . Reference numeral 26 denotes a plate for fixing the plunger, and the plunger is fixed to this plate 26 with screws 27 or is formed integrally with the plate Y.

In the pick-up arm lifting device configured in this way, the iron core 22 overcomes the biasing force of the spring 23 and suddenly hits the iron core frame 28 at the moment when current flows through the plunger, so that metal-to-metal impact vibration and Impact sounds are generated, both of which are extremely harmful to the record player.

Figures 2 and 3 show the impact vibration of the plunger itself.

This shows a conventional example in which rubber dampers 5-29 and 30 are attached to the parts that collide to prevent impact noise.
This alone cannot sufficiently suppress both vibration and sound, and harmful impact vibrations and impact noises are only slightly reduced.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a pickup arm lifting device using a plunger that can almost completely eliminate such harmful impact noise and vibration.

Structure of the Invention The present invention provides a pick-up arm lifting device using a plunger, which includes a movable iron core of the plunger,
By applying a viscous material between the plunger and the pipe attached to the outside, the viscous material eliminates the impact noise and vibration of the plunger, allowing the pickup arm to move up and down quietly.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below. However, since the device shown in FIG. 1 can be used as is for the configuration other than a portion of the plunger, redundant explanation will be avoided, and the configuration of a portion of the plunger will be shown in FIG. 4. I will show and explain this.

In FIG. 4, 31 is a pipe attached to the outside of the iron core 22, with an appropriate clearance between it and the iron core 22, and a viscous material such as silicone oil is applied therebetween. Numeral 33 is a flange that receives a spring 23 that constantly biases the pickup in the upward direction, and 34 is a groove that serves as a reservoir for oil, etc., and is provided on the outer periphery of the iron core 22.

In the above configuration, the moment the plunger is turned on to lower the pickup, the iron core 22 is activated by the spring 2.
It overcomes the urging force of No. 3 and is attracted toward the steel core frame 28. At this time, the core 22 is slowly attracted by the viscous resistance of the viscous material applied between the pipe 31 and the core 22, and hits the core frame 28 at a slow speed. Therefore, almost no vibration shock is generated, and no vibration noise is generated. Iron core 22
When is attracted toward the steel core frame 28, due to the weight of the pickup arm that is applied to the spring 14 and the lift arm 8,
The lift shaft 10 moves toward the page 16 as indicated by the arrow 7 in FIG. At this time, the movement of the connecting part 17 causes the cylinder 18 to rotate in the right direction in Figure 1, but due to the viscous resistance of the viscous material between the shaft 19 and the circular part of the cylinder 18, the cylinder 18 rotates at a slow speed. do. The above is the downward movement of the pickup.

Next, when the current to the plunger is cut off, the force of the spring 23 pushes the cylinder 18 upward in the opposite direction to the downward movement. At this time, due to the viscous resistance acting between the shaft 19 and the cylinder 18, the connecting portion 1A slowly pushes the lift shaft 1° upward in the direction of the arrow 16. At this time, if the spring 14 is made to have a force of about A that is about the force of the spring 23, the lift shaft 1o can be sufficiently pushed up by the force of the spring 23. When the lift shaft 10 moves in the direction of the arrow 16, the lift arm 8 lifts the pickup,
The cartridge will be separated from the record surface. The above is the lifting operation of the pickup.

According to the device configured as described above, the impact vibration and impact sound of the plunger are almost completely reduced to 1s8. IL, the pick roller 7'' slowly descends when the plunger is energized, and slowly rises when the plunger current is cut off.

Effects of the Invention In the present invention, the movement of the plunger's iron core is braked by the viscous resistance of a viscous body, so the plunger's iron core is gently sucked and the pickup is gently moved without impact noise or impact vibration. It can be raised and lowered.

Also, if the power is suddenly turned off due to a power outage, etc., and the plunger current is cut off, the pickup arm will slowly rise due to the force of the spring and the viscous resistance of the viscous body, and will be moved by the needle of the cartridge. It also has the effect of preventing scratches on the record.

[Brief explanation of drawings]

Figure 1 is a partial sectional view of a conventional pickup arm lifting device configured using a plunger, and Figures 2 and 3 are vibration and soundproofing of the plunger used in the conventional pickup arm lifting device. FIG. 4 is a sectional view of a plunger used in an embodiment of the present invention. 1...Cartridge, 2...Head shell, 3...Pickup arm, 4...
... Balance weight, 6,6 ... Bearing, 8 ... Lift arm, 1o ... Lift rod, 11 ... Operation cam, 18 ...・・・・・・
Cylinder, 19... Shaft, 22 Mountain...
Iron core, 23...Spring, 26...Plunger body, 28...Iron core frame, 31...
・Pipe, 32... Coil, 33...
flange. Name of agent: Patent attorney Toshio Nakao and 1 other person Shin 1
Figure 8

Claims (1)

[Claims] (1) A pickup arm including an electromagnetic solenoid whose iron core is connected to a lifting mechanism that raises and lowers the pickup arm, a spring that constantly biases the iron core in a direction to raise it, and a viscous body that brakes the movement of the iron core. Lifting device. @) A pipe is attached to the outside of the electromagnetic solenoid's iron core with a slight clearance, and a viscous substance such as oil is applied between the iron core and the pipe, and the movement of the iron core is braked by the viscous resistance. A lifting device for a pick amplifier arm according to claim 1.