JPH0216401Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pick-up arm elevating device for a record player.

Conventionally, this type of device has been provided with an upper spring on the upper surface side of the lifting piston of the pick-up arm that biases the piston in the direction of lowering the piston, and a cam body on the lower surface side of the sub-piston. A structure is known in which the sub-piston is disposed so as to be able to move toward and away from the piston, and the sub-piston is constantly urged upward by a downward spring, and viscous resistance is applied to both pistons.

However, according to such a structure, not only is it necessary to keep the upper spring in a compressed state in order to lower the pick-up arm, but also to keep the lower spring in a compressed state in order to raise the pick-up arm. Since it is necessary to use a spring having a stronger elastic force than the spring, it is necessary to appropriately set the spring force of both springs in order to raise and lower the pick-up arm at a desired speed.

Further, since the lifting and lowering of the pick-up arm is switched by rotating the cam, the lifting and lowering does not start until the cam has rotated to a certain extent, making it impossible to operate quickly.

The present invention solves these problems and makes it possible to independently set the spring for raising and lowering the pick-up arm to the elastic force necessary for raising and lowering the arm, and also enables quick raising and lowering of the arm. To provide a device for lifting and lowering a pick-up arm that can be moved up and down.

The invention will now be described with reference to the illustrated embodiments. In FIGS. 1 and 2, 1 is a player body, 2 is a rotating shaft, 3 is a turntable, and 4 is a record disc. A pick-up arm 5 has a stylus tip 6 attached to its tip, and the pick-up arm 5 is supported by a support shaft 7 on a pedestal 8 so as to be able to swing vertically. 9 is the outer magnetic frame,
The substrate 11 of the player main body 1 via the support frame 10
attached to the side. 12 is a piston holder fixed to the outer magnetic frame 9; 13 is a solenoid housed in the outer magnetic frame 9; and 14 is a plunger that is moved up and down by the magnetic force of the solenoid 13. A piston 15 is inserted into the center hole of the piston holder 12 through a material having viscous resistance so as to be movable up and down. A plunger 14 is fitted into the lower end of the piston 15 so as to be movable up and down. Reference numeral 16 denotes an internal spring that always urges the piston 15 upward, and is housed inside the plunger 14 and is interposed between the locking piece 17 at the lower end of the plunger 14 and the piston 15. 18 is plunger 14
An external spring that constantly biases the plunger 1 downward.
It is interposed between the lower end of the solenoid 13 and the flange portion 14a at the lower end of the plunger 14 at the outer periphery of the plunger 14. As shown in FIG. 3, a U-shaped connecting arm 19 is attached to the upper end of the piston 15, and a round pin 20 is inserted into the tip of the connecting arm 19. The round pin 20 is engaged from above with a rod-shaped projection 21 provided at the base end of the pick-up arm 5, and therefore the pick-up arm 5 can be moved up and down by the vertical movement of the piston 15. Note that the rod-shaped protrusion 21 moves when the pick-up arm 5 is raised.
It engages with a V-groove 23 formed in the fixed wall 22 of the pedestal 8.

Next, the action will be explained. FIG. 1 shows the pick-up arm 5 when it is raised. When the solenoid 13 is energized in this state, the plunger 14 is immediately attracted upward by the magnetic force generated in the solenoid 13, and the plunger 14 is immediately attracted upward by the magnetic force generated in the solenoid 13. The stopper 17 locks the inner spring 16 into the flange portion 14a of the plunger 14.
compresses the outer springs 18 and stores force. Inner spring 1
The accumulated force of 6 urges the piston 15 upward,
The piston 15 moves slowly upward due to the viscous resistance of the substance interposed between the piston holder 12 and the piston 15, and the stored force of the internal spring 16 is gradually released. At this time, the round pin 20 at the tip of the connecting arm 19 attached to the upper end of the piston 15 also gradually rises.
At the same time, the rod-shaped protrusion 21 formed on the base side of the swinging fulcrum of the pick-up arm 5 rises, and the pick-up arm 5 gradually descends around the support shaft 7 and stops descending when the needle tip touches the record surface. do.
However, the piston 15 rises due to the accumulated force of the inner spring 16 until it reaches the upper part of the plunger 14, and a gap is created between the rod-shaped projection 21 and the round pin 20, and the contact between them is released, so the pick-up arm 5 As shown in FIG. 2, it can freely swing up and down around the support shaft 7, following the record surface.

Solenoid 13 raises the pick-up arm 5.
This becomes possible when the energization to the solenoid 13 and the flange portion 14a of the plunger 14 is removed.
The outer spring 18 compressed and stored force between the piston 1
The accumulated force is gradually released against the viscous resistance of the substance between the plunger 14 and the piston holder 12, and at the same time as the plunger 14 and the piston 15 are lowered, the connecting arm 19 and the round pin 20 also begin to lower. As a result, the rod-shaped projection 21 and the round pin 20 come into contact again,
Since the rod-like projection 21 is lowered, the pick-up arm 5 begins to rise and is raised to the locking position.
As described above, the pick-up arm 5 can be raised by de-energizing the solenoid 13, so when the power to the player body 1 side is stopped, the pick-up arm 5 will automatically rise. , the pick-up arm 5 is constantly lowered onto the record 4, which may damage the record 4 or damage the stylus tip 6.
This has the advantage of preventing problems such as damage to the product.

According to the present invention, by energizing and disabling the solenoid, the pick-up can be started to move up and down quickly.Furthermore, when the pick-up arm is rising, both the inner and outer springs are in an extended state, and this In this state, the solenoid is energized to attract the plunger, compress the inner spring, and the restoring force of the inner spring allows the piston to gradually rise against viscous resistance while lowering the pick-up. When the excitation is released, the plunger is pushed down by the restoring force of the outer spring, and the inner spring of the plunger, which has already been extended, maintains its extended state and gradually lowers the piston against viscous resistance, causing the pick-up arm to move down. 5, therefore, without considering the force relationship between both springs, the elastic force of the inner spring is used to lower the pick-up arm, and the elastic force of the outer spring is used to raise it. of,
It is only necessary to set each of them individually, and the settings can be easily and accurately performed, and the movement of the pick-up arm when raising and lowering becomes extremely stable. Furthermore, it is mechanically compact and can be installed in a small space.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a side sectional view in a non-playing state, FIG. 2 is a side sectional view in a playing state, and FIG. 3 is an enlarged view of the main parts. 5 is a pick-up arm, 9 is an outer magnetic frame, 12 is a piston holder, 13 is a solenoid, 14 is a plunger, 15 is a piston, 16 is an inner spring, 1
8 is an outer spring, and 19 is a connecting arm.

Claims (1)

[Scope of utility model registration request] A solenoid is housed in an outer magnetic frame, a piston holder is fixed to the outer magnetic frame, and the piston holder is inserted into the center hole of the piston holder through a material having viscous resistance so as to be movable up and down, and has a pick-up arm at its upper end. a piston connected to the piston; a plunger fitted into the lower end of the piston so as to be movable up and down;
an inner spring that is housed inside the plunger and always biases the piston upward; and an inner spring that is interposed between the solenoid and the plunger flange on the outer periphery of the plunger and always biases the plunger downward. When the solenoid is energized, the plunger is attracted and raised to compress the outer spring and the inner spring, so that the urging force of the inner spring pushes the piston and the solenoid is de-energized. A device for lifting and lowering a pick-up arm, characterized in that the pistons are sometimes raised and lowered by the urging force of an external spring via the plunger against the viscous resistance.