JPS6020376A - Vibration isolating device of record player - Google Patents

Abstract

PURPOSE:To obtain a vibration isolating device which improves wow and flutter characteristics by providing two projection parts which are in the same direction as and the opposite direction to the winding direction of a coil spring on the circumferential surface of a rubber leg. CONSTITUTION:A pickup arm device 13 is provided with a damping weight 16 at the rear end of a tone arm 15 fitted rotatably to a rotary rack 14 provided to a record player body 11, and a cartridge 17 is provided atop of the tone arm 15. Further, vibration isolating devices each 20 consisting of the rubber leg 18 and coil spring 19 is provided on the bottom surface of the player body 1 at four corners of the bottom surface. The rubber leg 18 constituting the vibration isolating device 20 has a spiral projection part 21 in the same direction as the winding direction of the coil spring 19 and an opposite-directional spiral projection part 22 on the outer circumferential surface.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vibration isolating device for a record player comprising rubber legs and a coil spring.

Structure of conventional example and its problems Traditionally, record players have one record player body 1 and two record discs 2 on the top side, as shown in FIGS. 1 and 2.
The turntable 3 on which is mounted and the record 2 mentioned above
A pickup arm device 4 for tracing the sound groove is provided, and a vibration isolating device 5 is provided on the bottom surface of the record player main body 1. And the vibration isolator 5
il-J: As shown in FIG. 3, it is composed of a coil spring 6 for preventing vertical vibration and a rubber leg 7 for preventing lateral vibration. However, with the above-mentioned vibration isolating device, although longitudinal vibration can be prevented to some extent by selecting the installation location of the record player body 1, lateral vibration is generated by the record player body 1 itself, and the pick amplifier arm device 4 is Vibration is transmitted to the tone arm 8 and damping weight 9, and as a result, the cartridge 10 at the tip of the tone arm 8 vibrates, generating a playback signal that is not in the sound groove of the record 2, resulting in S/N and wow/flutter characteristics. The disadvantage was that it worsened the

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art.
An object of the present invention is to provide a vibration isolating device for a record player that can improve /N characteristics and wow/flutter characteristics.

Structure of the Invention In order to achieve the above object, the present invention provides a spiral protrusion on the circumferential surface of a rubber leg that is combined with a coil spring in the same direction as the winding direction of the coil spring. The feature is that a spiral protrusion is provided in the opposite direction. According to this configuration, it is possible to damp the repulsive force of the rotational torque generated by the drive motor provided within the record player body, and further damp the reaction force received by the repulsive force. It is also possible to remove unnecessary cogging components specific to the drive motor.
This has the advantage that S/N and wow/flutter characteristics can be improved.

DESCRIPTION OF EMBODIMENTS FIGS. 4 to 6 show an embodiment of the present invention.
In the figure, reference numeral 11 denotes a record player body, on the top of which is provided a turntable 12 and a pickup arm device 13 for tracing the sound groove of a record (not shown) mounted on the turntable 12. There is. This pickup arm device 13 is a record player body 1.
A damping weight 16 is provided at the rear end of a tone arm 15 which is rotatably attached to a rotating mount 14 provided in 1, and a cartridge 17 is provided at the tip of the tone arm 15. In addition, the record player body 11
A vibration isolating device 2o composed of rubber legs 18 and a coil spring 19 is provided on the bottom surface of the holder. The vibration isolating device 2o is disposed at each of four corner portions of the bottom surface of the record glare main body 11. The rubber leg 18 constituting the vibration isolator 20 has a spiral protrusion 21 on its outer peripheral surface in the same winding direction as the coil spring 19, and a spiral protrusion 21 in the opposite direction to the winding direction of the coil spring 19. shaped protrusion 22
have. In such a configuration, the turntable 12 rotates in the clockwise direction a by the rotational torque of the drive motor installed inside the record player main body 11.
The reaction force acts on the counterclockwise direction, but since there is no way for the force to escape, it is transmitted to the cavity portion constituting the record glare main body 11. This is explained by Ka's third law. When the force generated by the reaction of the rotational torque is transmitted to the cabinet that makes up the record player body 11, the tone arm 15 and damping weight 16 that make up the pink-up arm device 13 vibrate, causing the movement of the cartridge 17 The output is generated as a signal that is not in the sound groove of the record. In this embodiment, if the coil spring 190 is wound in a counterclockwise direction, the reaction force generated by the rotational torque is absorbed by the spiral protrusion 21 provided on the rubber leg 18. The reaction force is then absorbed by the spiral protrusion 22 provided on the same rubber leg 18. In this way, by absorbing the reaction force generated by the rotational torque by the two-direction spiral protrusions 21 and 22 provided on the rubber leg 18, the reaction force is transmitted to the cabinet that constitutes the record player body 11. Pick up arm device 1
Tone arm 15 and damping weight 1 that make up 3
It is possible to prevent vibrations from being transmitted to 6. Furthermore, in this embodiment, the diamond-shaped portion 23 enclosed between the counterclockwise protrusion 21 and the time-opening protrusion 22 is left as a portion that acts on vibration in the vertical direction, and the rubber leg 18 itself This is done so as not to impair the effect of the

As described above, according to the present invention, even if a diving weight is attached as a tone arm weight to suppress the low-frequency resonance of the cartridge, it does not vibrate due to the reaction force of the rotational torque, and the vibration that is unique to the drive motor is eliminated. Cogging components can also be suppressed. Therefore, the S/N and crack/flutter characteristics are not impaired, and there is an advantage that a record player with good performance can be constructed.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional record player, FIG. 2 is a front view thereof, FIG. 3 is an enlarged view of the vibration isolating device of the same record player, and FIG. 4 is a plan view of the record player of the present invention. FIG. 5 is an enlarged view of the vibration isolator of the same cordless printer, and FIG. 6 is a perspective view of a rubber leg constituting the same vibration isolator. 11...Record player, 18...
...Rubber leg, 19...Coil spring, 21
．． 22... Protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4 Figure 6 Figure 5 Evening Figure 6.

Claims (1)

[Claims] The rubber feet provided on the bottom of the record player body, and? The knee (7) is not provided with fldQ (coil spring fitted to the outer periphery of D), and a spiral protrusion is provided on the surface of the rubber leg in the same direction as the winding direction of the coil spring. A vibration isolating device for a record player, characterized in that a spiral protrusion is provided in the opposite direction.