JPS5932015Y2 - Pick-up arm lifter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hiccup arm lifter.

Conventionally, the arm lifter mechanism in auto-return type or fully automatic type pink amplifier equipment, for example,
A mechanism as shown in FIG. 1 is used.

In the figure, 21 is a pink up arm, 22 is a lift shaft, and a lift arm 23 is attached to the upper end.
The lift arm 23 supports the pink up arm 21.

Reference numeral 24 denotes a fully automatic mechanical sliding cam, which rotates to lower the elevating shaft 22 on its cam surface, or to push it up against the elastic force of the spring 25, thereby lifting the lift arm 23. The pink-up arm 21 is raised and lowered through.

Reference numeral 26 denotes a manual operation lid cam, which is rotatably attached to the cabinet 27 and is rotated by the operation of a lever 28, and its slope cam surface raises and lowers the auxiliary rod 29 attached to the lift arm 23. let me,
This allows the pink up arm 21 to be raised and lowered.

In addition, numeral 30 in the figure is an adjustment screw for fixing the lift arm 23 to the elevating shaft 22, and is used to adjust the needle height.

31 is a height correction screw for adjusting and fixing the auxiliary rod 29 to the lift arm 23.

However, according to the conventional arm lifter described above, the lifter cam 26, the auxiliary rod 29, and the lifter arm 2
3 acts as a rigid body mechanically, so there is a drawback that the pickup arm 21 bounces on the lifter arm 23 when the lever 28 is suddenly actuated.

Furthermore, adjustment is made using a correction screw 31 to match the needle height when activated by the mechanical sliding cam 24 and the needle height when activated by operating the lever 28. It is extremely difficult.

This invention eliminates the above drawbacks, and allows for smooth ascending and descending without the risk of the pink up arm bouncing even if the lever is suddenly actuated by manual operation.
To provide an arm lifter for a pink amplifier in which the needle height can be adjusted extremely easily.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4.

FIGS. 2 and 3 show an example in which the present invention is applied to an auto-return or fully automatic type arm lifter, and FIG. 4 shows an example in which the present invention is applied to a mechanism exclusively for manual operation.

In Figures 2 and 3, 1 is a lifter arm that supports a pink-up arm (not shown); The lifter arm 1 is fixed to the upper end of an intermediate shaft 2a with an adjustment screw 5.

Reference numeral 6 denotes a coil spring for always pressing the lifting shaft 2 downward, and 7 a mechanical sliding cam, which rotates to raise and lower the lifting shaft 2 on its cam surface. This is how it was done.

Reference numeral 8 denotes a rotary disk pivotally supported on the cabinet 3, which can be rotated by operating a manual lever 9.The rotary disk 8 has an eccentric position. A retaining pin 10 is provided to protrude downward, and the retaining pin 10 projects through an arcuate guide groove 11 bored in the cabinet 3.

12II'i lifter cam, which is disposed on the lower surface of the cabinet 3, is rotatably supported on a pivot shaft 13, and can be moved up and down along the pivot shaft 13.

A notch 14 for engaging the engagement pin 10 is provided on one side of the lifter cam 12, and a cam surface 15 consisting of a sloped surface is formed on the other side.

Reference numeral 16 denotes a coil spring provided on the pivot shaft 13, and is used to bias the lifter cam 12 so as to constantly press it upward.

Therefore, the lifter cam 12II'i can be lowered elastically.

17Ifj: An arm rod attached to the lifting shaft 2, which is formed in an oval shape, and its tip 17a slides on the cam surface 15.

Reference numeral 18 denotes an adjustment stopper screwed through a wire hole 19 provided in the cabinet 3, and is used to determine the upper limit position of the lifter cam 12.

That is, when the upper limit position of the lifter cam 12 is raised, the height of the needle lifted during manual operation becomes higher, and when the above-mentioned exposed position is lowered, the needle height becomes lower.

Normally, the needle height is adjusted by operating the mechanical sliding cam 7 by adjusting the tightening position to the lifting shaft 2 using the adjustment screw 5, but in order to adjust the needle height and the needle height during manual operation. Unlike the conventional device shown in FIG. 1, which requires adjustment of the fastening position between the auxiliary rod 29 and the lifter arm 23, the adjustment is extremely easy.

In the one shown in FIG. 4, there is of course no mechanical sliding cam, but the cam is housed in a cylinder 20 formed in the lifting shaft 2F'i cabinet 3, and the coil spring 6 is built in the cylinder 20.

Further, the adjustment screw 5 is adapted to tighten the elevating shaft 2 and a central shaft 2a inserted through the center thereof.

The lifter cam 12 has one end projecting in a cross-sectional shape, and a cam surface 15 is formed at the tip thereof.
The lower end of a) is placed directly on the cam surface 15.

The other configurations are substantially the same as those shown in FIGS. 2 and 3.

Next, to explain an example of operation, in the one shown in FIGS. 2 and 3, the lifting shaft 2 is gently raised and lowered on the cam surface by 70 rotations of the mechanical sliding cam, and Push up or lower the up arm.

During manual operation, when the lever 9 is moved from one side to the other, the rotating disk 8 rotates, and the retaining pin 10 engages with the notch 14 of the lifter cam 12, so that the lifter cam 12 is rotated.
rotates, and the cam surface 15 moves the lifting shaft 2 up and down via the arm rod 17.

In the manual operation only one shown in FIG. 4, when the lifter cam 12 rotates, the lifting shaft 2 is directly actuated by the cam surface 15 of the lifter cam 12.

In the above operation example, if the lever 9 is operated quickly, a force is suddenly applied by the cam surface 15 to push up the lift shaft 2, but the lifter cam 12I/'i coil spring 16 causes the lifter cam 12I/'i to fall elastically. Because of this, the sudden action described above can be absorbed, and the braking by the viscous agent of the pongee receiving part of the lifting shaft 2 and the elastic force of the coil spring 6 and the elastic force of the coil spring 160 of the lifter cam 12 are balanced, and the lifting shaft 2 rises quietly.

Therefore, even if the lever 9 is suddenly operated, there is no possibility that the pink-up arm will bounce.

In addition, even if the braking force decreases due to deterioration or shortage of the above-mentioned viscous agent, the balance between both coil springs 6 and 16 prevents sudden operation. Therefore, even when the pickup arm is lowered manually (during play), There is no risk of damaging the needle tip or the record.

According to the Pink Amplifier arm lifter of the present invention, the lifter cam is rotatably supported on a shaft so that it can be raised and lowered,
an adjustment stopper provided on the shaft support for regulating the position 13J1 of a spring and a lid cam for always urging the lifting shaft of the lifter arm in the upward direction against its elastic force; The lifter cam includes a rotating disk that rotates when a manual operation lever is operated, and an engaging portion formed on the lifter cam so as to be engaged with an engaging pin protruding from the rotating disk. The lifter cam is configured so that it rotates indirectly when the manual operation lever is operated, so if the manual operation lever is suddenly operated, the cam surface of the lifter cam will suddenly generate a force that tries to push up the lifting shaft of the lifter arm. However, the lifter cam is elastically lowered by the spring provided on the shaft support, and this allows it to accurately absorb the sudden action described above, and the elastic force acting on the lifting shaft is reduced. The elastic force of the spring and the elastic force of the spring are balanced, and the elevating shaft can be raised quietly.

In addition, even if the braking force decreases due to deterioration or shortage of the viscous agent in the bearing part of the lifting shaft, sudden movement can be prevented due to the balance of the elastic force, so manual operation can prevent pink 7
Even when the 77" arm is lowered, sudden lowering can be prevented, and there is no risk of damaging the stylus tip or record surface.

The mechanism for indirectly rotating the lifter cam by operating the manual operating lever includes a rotating disc that rotates when the manual operating lever is operated, and a retainer protruding from the rotating disc. Since it is constituted by a retaining portion formed on the lifter cam so that the dowel pin can be engaged with, the structure is simple and the operation is performed accurately.

In addition, since the upper limit position of the lifter cam can be adjusted with an adjustment stopper, it is extremely easy to adjust the needle height when lifting the pink up arm, especially when using an auto return type or fully automatic type mechanism. This is extremely convenient when adjusting the needle height and the needle height of manual operation.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a part of a conventional auto-return or fully automatic type arm lifter; FIGS. 2 to 4 show an embodiment of the arm lifter according to the present invention; FIG. FIG. 3 is an exploded perspective view, and FIG. 4 is a 1' cross-sectional view showing an example configured exclusively for manual operation. 1... Lifter arm, 2... Lifting shaft, 1... Mechanical sliding cam, 8...
Rotating disc, 9... Lever 12... Lifter cam, 15... Cam surface, 16...
・Coil spring, 17...Arm rod, 18...
...Adjustment stopper 19...Wire hole.

Claims (1)

[Scope of utility model registration request] The lifter cam is rotated by operating a manual operation lever, and the lid is constantly biased in a downward direction by a first spring and braked by a viscous material, so that the lid moves up and down according to the cam surface by the rotation of the lifter cam. - In an arm lifter for a pickup arm that raises and lowers the lifting shaft of the arm, the lifter cam is rotatably and pivotally supported so as to be raised and lowered, and the lifter cam is provided on the shaft supporting part of the lifter cam to raise and lower the lifting shaft of the lifter arm. A second spring having a stronger elastic force than the first spring for constantly biasing the lifter in the upward direction against the elastic force, an adjustment stopper for regulating the upper limit position of the lifter cam, and a manual operation. A rotating disk that rotates by operating a lever,
and a retaining portion formed on the lifter cam so as to be engaged with an engagement pin protruding from the rotating disc, and configured such that the lifter cam is indirectly rotated by operation of the manual operation lever. An arm lifter that is characterized by: