JPH0222802Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a clamp elevation mechanism in a front pull-out player, etc., in which the tone arm elevation and the clamp mechanism are linked to enable automatic clamping and unclamping. be.

Even in conventional mechanical fully automatic players, the tone arm must be manually unclamped during performance, and the tone arm must be manually clamped even when the player is not in use after a performance. Therefore, the manual work of clamping and unclamping the tone arm is troublesome, and sometimes the tone arm is forgotten to be clamped, resulting in damage to the head portion of the tone arm. Particularly in front pull-out type players, since the tone arm is pulled out at the same time as the player is pulled out, the tone arm must be automatically clamped when the player is pulled out.

This idea was made based on the above-mentioned circumstances, and a groove was created in the cam attached to the fully automatic mechanical player, so that the tone arm's elevation and clamp were linked, so that when the tone arm was on the armrest, the tone arm was always on the armrest. When the arm support goes up, the arm clamper goes up and enters auto-in operation, and the tonearm leads out and goes down on the armrest, at the same time the arm clamper goes down and clamps the tonearm. A clamp elevation mechanism in a player is provided.

Hereinafter, one embodiment of this invention will be described in detail based on the attached drawings. FIG. 1 is a sectional view showing the main parts of a fully automatic mechanical player according to this invention. 1 is a timing motor installed on the bottom of the mechanical chassis 2, and a tone arm 3 is installed on the shaft 1a.
A switch cam 4 for driving the tone arm 3 is fixed thereto, and a timing gear 4a of the switch cam 4 meshes with a timing gear 5a of a main cam 5 for raising and lowering the tone arm 3. An arm base 6 is installed on the upper surface of the mechanical chassis 2 at a predetermined interval, and the arm base 6 has a clamp lifting shaft 7 that moves up and down as the switch cam 4 rotates, as shown in FIG. A tone arm elevation shaft 8 that raises and lowers the tone arm 3 as the main cam 5 rotates is slidably supported. The clamp elevating shaft 7 and the tone arm elevation shaft 8 have semispherical lower end surfaces, and can be smoothly engaged and disengaged from the "V"-shaped cam groove 4b of the switch cam 4 and the cam 5b of the main cam 5. At the same time, it is constantly urged downward by a spring 9 interposed between the arm base 6 and stoppers 7a and 8a fixed to the lower end.

A shaped arm clamper 10 is fixed to the clamp elevating shaft 7 by a set screw 11, and when the tone arm 3 is positioned on the armrest 12, the tone arm 3 is moved from the upper surface of the arm rest 12 by lowering the clamp elevating shaft 7. It is designed to be clamped to. Armrest 12 above
has a slight recess on the upper surface where the tone arm 3 rests, and is fixed to the arm base 6 via an arm rest shaft 13.

FIG. 3 is a perspective view of the switch cam 4 used in the fully automatic mechanical player. A cam groove 4b is formed in the switch cam 4, and one rotation of the switch cam 4 moves the tone arm 3 from above the armrest 12. Auto-in, lead-out, and return to the upper surface of the armrest 12 are performed.

That is, the tone arm 3 is connected to the armrest 12.
When the tone arm 3 is in the rest position, the lower end of the clamp elevating shaft 7 is positioned in the cam groove 4b, and the arm clamper 10 is lowered by the force of the spring 9 to automatically clamp the tone arm 3. There is. When the play switch is turned on and the switch cam 4 rotates, the lower end of the clamp lifting shaft 7 climbs over the cam groove 4b, and the clamp lifting shaft 7 immediately rises, the arm clamper 10 comes off from the tone arm 3, and at the same time the tone arm elevator This allows the player to move up and enter an auto-in operation such as playing the player.

Next, to explain the operation of the clamp elevation mechanism in the player configured as described above, first, when the play button (not shown) is turned on, the switch cam 4 and the main cam 5 linked to the switch cam rotate, and the arm clamper 10 and the tone arm elevation shaft are rotated. At the same time as the tone arm 8 is raised and the clamp is released, the arm support (not shown) of the tone arm 3 is raised and the arm is lead-in. Subsequently, the arm support descends and enters the playing state. The record is played by the head of tone arm 3, and the end of the record is detected.
When the cut button (not shown) is turned on, the arm support rises again, leading out. When the tone arm 3 rises and leads out, the arm support descends again, and at the same time, the arm clamper 10 descends so that the tone arm 3 is located on the upper surface of the arm rest 12 and is clamped by the arm clamper 10.

All of the above operations are performed automatically when the play button is turned on for the first time, and there is no need for manual operation.

According to the clamp elevation mechanism in the player according to this invention, the clamp elevating shaft for clamping or unclamping the tone arm on the rest is operated by a switch cam that is horizontally rotationally driven by a timing motor. At the same time, the raising and lowering of the elevation shaft that raises and lowers the tone arm is performed by the main cam that rotates horizontally in conjunction with the rotation of the switch cam, so the configuration is simple, and the operation of clamping or unclamping the tone arm and the tone arm are simple. In particular, the switch cam has a "V"-shaped cam groove, and when the lower end of the clamp elevating shaft is fitted into the cam groove, the clamp is immediately clamped. At the same time, as soon as the lower end passes through the cam groove, the clamp is released and the elevator operation can be performed. Therefore, there is no need for manual operation to clamp the tone arm, and there is no risk of forgetting to clamp it.
Ideal for front pull-out fully automatic players, etc.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts of a fully automatic player showing an embodiment of this invention, Fig. 2 is a sectional view of a clamp section of a tone arm according to this invention, and Fig. 3 explains the switch cam part of Fig. 1. FIG. 3...Tone arm, 4...Switch cam, 4
b...Groove, 5...Main cam, 6...Arm base, 7...Clamp elevation shaft, 8...Tone arm elevation shaft, 10...Arm clamper,
12...Armrest.

Claims (1)

[Scope of Claim for Utility Model Registration] The lower end of the clamp lifting shaft of a hair arm clamper that is horizontally rotationally driven by a timing motor and has a V-shaped cam groove is brought into contact with the clamp lifting shaft. When the tone arm and the switch cam for raising and lowering are located on the armrest, position the lower end of the clamp lift shaft in the cam groove of the switch cam and lower the clamp lift shaft to put the tone arm in the clamped state. A clamp mechanism whose lower end passes through the cam groove of the switch cam raises the clamp elevating shaft to immediately release the tone arm from the clamp, and an elevator mechanism whose lower end moves the tone arm in an elevator motion by raising and lowering the elevation shaft. , has a gear that engages with a gear formed on the switch cam, and is horizontally rotated as the switch cam rotates, and also has a main cam that brings the lower end of the elevator shaft into contact to raise and lower the elevator shaft. A clamp elevation mechanism in a player characterized by comprising: