JPS624884Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lifting device for the pick-up arm of a record player.The pick-up arm is raised and lowered electrically using a plunger and a solenoid, and is raised and lowered slowly. This prevents damage to the record and needle, and provides an excellent operating feel.

Conventionally, some record players mechanically move the piston up and down by operating the cueing lever, thereby raising and lowering the pick-up arm relative to the record, but operating the cueing lever requires a relatively large amount of force. Moreover, since the pick-up arm moves up and down rapidly in response to switching of the cueing lever, there was a problem in that the arm could come off the armrest and fall onto the record, potentially damaging the record or the needle. .

The present invention provides a device for lifting and lowering a pick-up arm that solves these conventional problems.

An embodiment of the present invention will be described below with reference to the drawings.

In Figures 1 and 2, 1 is a pick-up arm, 2 is a pick-up armrest, 3 is a solenoid, 4 is a piston holder, 5 is an outer magnetic frame, 6
7 is a plunger fitted into the lower end of a piston, which will be described later, so as to be able to move up and down; 7 is a spring that is stored inside the plunger 6 and stores the biasing force when the plunger 6 is sucked; 8 is always urged upward by the spring 7; A piston 9 displaces the pick-up armrest by releasing the biasing force stored in the spring 7, and 9 is a locking piece of the spring 7 fixed to the lower end of the plunger 6. Note that a substance having viscous resistance, such as viscous fluid, is applied between the piston 8 and the through hole 4a of the piston holder 4.

In the above configuration, to first explain the operation when rising, the solenoid 3 is in the state shown in FIG.
When energized, the plunger 6 is immediately attracted by the magnetic force generated by the solenoid 3, the locking piece 9 attached to the bottom compresses the spring 7, and the accumulated energy urges the piston 8 upward. However, at this time, since a viscous fluid is interposed between the piston holder 4 and the piston 8, the viscous resistance buffers the rise of the piston 8, and gradually the spring 7
release the energy of As a result, the pick-up arm rest 2 pivotally attached to the upper part of the piston 8 also slowly rises, and eventually comes into contact with the pick-up arm 1 to gradually lift the needle tip (not shown). FIG. 2 illustrates this state.
By appropriately selecting the spring constant of the spring 7, the rising speed of the piston 8 can be appropriately set.

On the other hand, to explain the operation when descending, when the energization to the solenoid 3 is stopped in the state shown in FIG. 2, that is, in the non-playing state, the attraction of the plunger 6 is released, and the plunger 6 begins to fall due to gravity. At this time, the piston 8 falls due to gravity together with the plunger 6, and the falling motion is buffered by the viscous resistance between the piston 8 and the piston holder 4, just like when it rises, so the pick-up arm 1 and the pick-up arm rest 2 gradually fall. After the stylus at the tip of the pick-up arm 1 is gently dropped onto the record surface, the pick-up arm 1 is released. By appropriately selecting the mass of the plunger 6, the descending speed of the piston 8 can be appropriately set.

As mentioned above, the pick-up arm lifting device according to the present invention uses a solenoid and a plunger fitted into the lower end of the piston so that it can move up and down. The pick-up arm can be raised and lowered with a light operation, and the arm can be raised and lowered slowly using a material with viscous resistance applied to the through hole of the piston holder and a spring housed inside the plunger that urges the piston upward. It is possible to realize a lifting device that is easy to use, such as being able to prevent the arm from coming off. Furthermore, since the spring is housed inside the plunger, a structure in which the plunger is sucked by a solenoid can be easily realized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention in a playing state, and FIG. 2 is a sectional view showing the above embodiment in a non-playing state. 1... Pick-up arm, 2... Pick-up armrest, 3... Solenoid, 4... Piston holder, 4a... Through hole, 5... Outer magnetic frame,
6...Plunger, 7...Spring, 8...Piston.

Claims (1)

[Scope of utility model registration request] A solenoid housed in an outer magnetic frame, a piston holder fixed to the outer magnetic frame, a piston inserted vertically into a through hole of the piston holder, and a piston inserted into the through hole of the piston holder. a substance having viscous resistance interposed between the piston, a plunger which is fitted into the lower end of the piston so as to be movable up and down and is moved up and down by the magnetic force of the solenoid, and a plunger which is housed inside the plunger and which moves the piston upward. A pick-up arm lifting device equipped with a spring that biases the pick-up arm.