JPS626571Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a horizontal balance device for a disc playback device, and in particular, a pair of pulley support pieces are provided at both ends of an arm linear movement device, and a pulley is vertically attached to the pulley support pieces. The lower part of the loop member hung on the pulley is locked to the arm part, and the upper part of the loop member is connected to the arm part.
A balancer having approximately the same weight as the arm is attached at a 180° position, and the balancer is moved in a direction opposite to the direction of movement of the arm in conjunction with the movement of the arm to control the main performance device. The present invention relates to a horizontal balance device for a disc playback device that maintains horizontal balance.

Conventionally, in an arm that rotates with one-point support, the weight of the cartridge side and non-cartridge side is balanced around the fulcrum, so even if the arm rotates, there is no weight imbalance and the turntable remains level. I never lost it. However, if the arm part 3, in which the weight of the cartridge side and the non-cartridge side are balanced around such a fulcrum as shown in Fig. 1, is adopted in a linear system in which the arm part 3 itself moves in a straight line, the arm part 3 With the movement of the turntable 2, the horizontality of the turntable section 2 will not be disturbed in a direction perpendicular to the direction of movement, but the horizontality of the turntable section 2 will be greatly disturbed in the direction of movement due to weight imbalance. In addition, in FIG. 1, 1 is the main performance device,
4 is an arm linear movement mechanism, and 9 is an external vibration absorber.

Conventionally, in order to maintain levelness, the strength of the external vibration absorbing device 9, such as a spring, was increased to absorb the weight imbalance caused by the movement of the arm section 3 itself. There was a problem that it became ineffective.

This invention was made by paying attention to the problems of the prior art. A pair of pulley support pieces are provided at both ends of the arm linear movement device, and the pulley is vertically attached to the pulley support pieces. The lower part of the loop member to be hung on the arm is fixed to the arm, and a balancer having approximately the same weight as the arm is attached to the upper part of the loop member at a position 180 degrees from the arm. It is an object of the present invention to solve the above-mentioned problems by moving the arm part in the opposite direction to the movement direction of the arm part in conjunction with the movement of the arm part.

This invention will be explained below based on the drawings. FIG. 2 is a perspective view showing an embodiment of this invention.

Reference numeral 1 denotes a main performance device, which consists of a turntable section 2 and an arm section 3. The arm portion 3 is disposed within an arm linear movement device 4, has its own drive source, and is moved linearly by, for example, a linear motor electromagnetic drive system. A pair of pulley support pieces 5 are provided on the turntable 2 on both sides of the arm linear movement device 4. Reference numeral 6 denotes a pulley, which is vertically protruded from the pulley support piece 5. A loop member 7 is hung on the pulley 6. Loop member 7
The lower part of the arm 3 is locked to form a vertical loop.

A balancer 8 is attached to the top of the loop member 7.

The weight of the balancer 8 is approximately the same as the weight of the arm portion 3.

9 is an external vibration absorber, which is attached to the turntable section 2.
It is attached to the lower surface of the main performance device 1 to absorb external vibrations and maintain the levelness of the main performance device 1.

The relative arrangement of the arm portion 3 and the balancer 8 in the loop member 7 is made to differ by 180°. That is, the center position of the arm part 3 and the center position of the balancer 8 are set so that when the arm part 3 comes to the center position of the arm part linear movement device 4, the center position of the arm part 3 and the center position of the balancer 8 coincide. Therefore, when the arm section 3 is at the right end position 4R, the balancer 8 is located at the position where the arm section 3 is at the left end position 4L, and conversely, when the arm section 3 is at the left end position 4L, the balancer 8 is located at the position where the arm section 3 is at the left end position 4L. The arm portion 3 is positioned at the right end position 4R. By doing this, since the arm part 3 and the balancer 8 have the same weight and their moving directions are opposite to each other, the increase in weight in the moving direction due to the movement of the arm part 3 can be compensated for by the movement of the balancer 8. The horizontality is always maintained. Note that when both the arm section 3 and the balancer 8 are at the center position of the arm section linear moving device 4, the external vibration absorbing devices 9 at both ends in the direction of movement of the arm section 3 are adjusted so that the main performance device 1 is horizontal.

As explained above, this invention provides a pair of pulley support pieces at both ends of the arm linear movement device, attaches the pulley vertically to the pulley support pieces, and attaches the lower part of the loop member that is hung on the pulley to the arm. Attach a balancer having approximately the same weight as the arm at the top of the loop member at a position 180 degrees from the arm, and move the balancer in the opposite direction to the direction in which the arm moves. By moving in conjunction with the arm, it is possible to prevent horizontality in the direction of movement due to weight imbalance caused by the movement of the arm, and to maintain the horizontal balance of the main musical instrument at all times. It is no longer necessary to absorb the weight imbalance caused by the movement of the external vibration absorbing device, and the effect is that the original role of the external vibration absorbing device can be fully demonstrated.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the prior art, and FIG. 2 is a perspective view showing an embodiment of this invention. 1... Main performance device, 2... Turntable section,
3...Arm part, 4...Arm part linear movement device,
5...Pulley support piece, 6...Pulley, 7...
Loop member, 8... Balancer, 9... External vibration absorber.

Claims (1)

[Scope of utility model registration request] In a linear arm type disc playback device in which a main performance device consisting of a turntable part and an arm part is supported by a plurality of external vibration absorbers, and the arm part itself moves in a straight line a disc placed on the turntable part, A pair of pulley support pieces are provided at both ends of an arm linear movement device in which the arm itself has a driving source, and the pulley is vertically attached to the pulley support pieces, and the lower part of a loop member that is hung on the pulley is attached to the arm. Attach a balancer having approximately the same weight as the arm at the top of the loop member at a position 180 degrees from the arm, and move the balancer in the direction opposite to the direction of movement of the arm. 1. A horizontal balance device for a disc playback device, characterized in that the horizontal balance device is moved in conjunction with the movement of the main performance device to maintain the horizontal balance of the main performance device.