JPS61129770A - Bearing unit of record player - Google Patents

Abstract

PURPOSE:To prevent the deflection of a rotating axis by appropriately pushing the 1st and 2nd bearing rollers by a pushing roller. CONSTITUTION:The 1st bearing roller 22, 2nd bearing roller 23 and pushing roller are so made that their ourter diameter is slightly different each other and their circumferences touch equally a rotating axis 17. In such a situation that a nut 31 is loosened, rotates an eccentric axis 27 by ortating a rod 32, and push the 1st bearing roller 22 and 2nd bearing roller 23 towards a trunk part 21 of the rotating axis 17 with appropriate pressure by the pushing roller 26, then tighten the nut 31 and fix an eccentric axis 27 to a base board 11. By such a procedure, the rotating axis 17 crosses the base board orthogonally, and it rotates without generating the deflection.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bearing unit in a record player that can prevent vibration of the rotating shaft of a turntable.

[Prior art]

Conventionally, record players have been known in which a turntable is rotated by a motor and an electrical signal is extracted from a record placed on the turntable via a pickup. In this record player, as shown in FIG. 3, a ball 3 is provided below the center of the lower end of the rotary shaft 2 to reduce rotational friction of the turntable 10 and to receive a thrust load. The rotary shaft 2 is rotatable inside the rotary shaft 2.

[Problem that the invention seeks to solve]

In the bearing 4, since it is necessary to provide lubricating oil between the guide hole 5 and the rotating shaft 2, a very small gap is formed between the guide hole 5 and the rotating shaft 2. For this reason, when the rotary shaft 2 rotates 20 times, the rotary shaft 2 performs a grinding motion using its lower end surface as a fulcrum, causing vibration, which adversely affects the playback quality of the record and the durability of the record and cartridge. However, there was a drawback that these functions could not be fully utilized.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bearing unit for a record player that eliminates the above-mentioned drawbacks of conventional bearing units.

[Means for solving problems]

In order to achieve the object, the present invention has the following configuration. That is, in a record player in which a turntable is rotated by a motor, a rotating shaft is provided at the center of rotation of the turntable, perpendicular to the upper surface of the turntable and detachably fixed, and one side of the outer periphery of the rotating shaft. first and second receiving rollers that are spaced apart from each other, circumscribe the outer periphery of the rotating shaft, and are rotatably provided at a fixed position on the base; 1. Located on the opposite side to the second receiving roller, rotatably provided on the base so that it can move forward and backward with respect to the first and second receiving rollers and fix its position, and the outer periphery of the rotating shaft a push roller that is circumscribed by and presses the rotating shaft against the first and second receiving rollers;
The rotating shaft can be rotated between the second receiving roller and the pushing roller without wobbling.

〔Effect of the invention〕

Since the rotary shaft can be appropriately pressed against the first and second receiving rollers by the push roller, the position of the rotary shaft of the turntable is determined, and therefore, the wobbling of this rotary shaft can be reliably prevented. Accordingly, it is possible to provide a bearing unit for a record player that can obtain high-fidelity playback sound quality when playing a record, and can fully demonstrate these functions without impairing the durability of the record, cartridge, etc. .

[Metal practice]

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2. In the figure, reference numeral 11 denotes a substrate (base) provided in the record player cabinet, and a through hole 12 is formed at a predetermined location on this base 110. In addition, the substrate 11
A support plate 13 is provided by a port 14 parallel to and spaced apart from the substrate 11 . A shaft support (center bolt) 15 is screwed into the center of the support plate 13 so that it can move forward and backward relative to the board 11, and a shaft support 150, a head 160, and a side surface (top surface) of the board are provided with a bolt orthogonal to the board 11. The rotary shafts 17 are brought into contact with each other. Substrate 11 so as not to touch the inner peripheral surface of the rotating shaft 17fi through hole 12! /c is inserted incorrectly. A ball portion 18 is provided at the lower end of the rotating shaft 17. This ball portion 18 is brought into contact with the head 16. Further, a seven flange 19 is provided on the upper part of the rotating shaft 17, and a turntable 20 is attached to the seven flange 19 in parallel with the substrate 11.

Further, as shown in FIG. 2, the base plate 11 also includes a first insulator, which is disposed on one side of the outer circumferential surface of the body 21 of the button rotation shaft 17 and circumscribed at a distance from each other on the outer circumferential surface of the body 21. A receiving roller 22 and a second receiving roller 23 are rotatably provided with their respective positions fixed. That is, the first
The receiving roller 22 and the second receiving roller 23 are rotatably fitted to fixed shafts 24 and 25 that are screwed and fixed to the substrate 11 while being in circumscribed contact with the outer peripheral surface of the body 21 of the rotating shaft 17, respectively. are combined.

Further, a push roller 26 is disposed on the other side of the outer periphery of the body portion 21 of the rotating shaft 17 . This push roller 26 is rotatably fitted into an eccentric shaft 27 button screwed onto the substrate 11. The eccentric shaft 27 includes a threaded shaft 29 integrally provided on one side of the connecting plate 28 and a threaded shaft 29 provided on the other side of the connecting plate 28.
It consists of a shaft part 30 that is integrally provided eccentrically with respect to the base plate 11, and a screw @ 29 can be rotatably mounted on the board 11 and the shaft part 31
are fixedly screwed together. A rotation rod 32 is provided at the lower end of the screw shaft 29. By loosening the nut 31 and operating the rotation rod 32 to turn the screw shaft 29, the rotation shaft 17 can be rotated against the outer peripheral surface of the body 21. The outer circumferential surface of the push roller 26 moves back and forth so that the outer circumferential surface of the body 21 of the rotating shaft 17 can be pressed against the outer circumferential surfaces of the first receiving roller 22 and the second receiving roller 23 with a predetermined pressure. . In addition, in FIG. 2, the amount of eccentricity between the aμ screw shaft 29 and the shaft portion 30 is shown. Further, the turntable 20 is connected to a motor (not shown) by a rotation transmission means such as a belt, so that the turntable 20 can be rotated.

331-t rubber sheet, and 34 is a record.

Note that the first receiving roller 22, the second receiving roller 23,
The outer diameter of each push roller z6 is slightly changed, and the rotating shaft 1
7, the outer peripheral surfaces of these rollers are in equalizing contact with each other.

With the nut 31 loosened, the eccentric shaft 27 is rotated through the rotating rod 32, and the first receiving roller 22,
The outer circumferential surface of the body 21 of the front rotation shaft 17 is pressed against the outer circumferential surface of the second receiving roller 23 by the push roller 26 with an appropriate pressing force, and the nut 31 is tightened to fix the eccentric shaft 27 to the base plate 11. As a result, the rotating shaft 17 is heated directly to the substrate 11, the position of the rotating shaft 17 is determined, and the rotation +11i1
17 can now be rotated without wobbling.

Here, when the motor (not shown) is operated, the turntable 20 rotates, but at this time, the rotating shaft 17 rotates without wobbling, so the turntable 20 also rotates smoothly without wobbling. Therefore, the shake of the record caused by the conventional rotation axis being photographed is prevented, the playback sound quality when playing the record is greatly improved, and the durability of records, cartridges, etc. is not impaired due to the shake of the rotation axis, and these can fully demonstrate its functions. Note that the first receiving roller 22 and the second receiving roller 2
3. Each outer periphery of the push roller 26 may be coated with rubber to further prevent vibration.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view showing one embodiment of the present invention, and FIG.
The figure is a cross-sectional view taken along the I-fi line in Figure 1, and Figure 3 is a longitudinal cross-sectional view showing a bearing unit in a conventional record player.
It is a diagram. 11... Substrate (base), 15... Shaft support (center bolt), 17... Rotating shaft, 20
...Turntable, 22...First receiving roller, 23...Second receiving roller, 26
......Push roller, 27...Eccentric shaft, 3
4...Record.

Claims (1)

[Claims] In a record player that rotates a turntable by a motor and extracts an electrical signal from a record on the turntable via a pickup, a record player is detachably fixed to the rotation center of the turntable, perpendicular to the top surface of the turntable. a rotating shaft provided as a rotary shaft; first and second receiving rollers;
The roller is located on the opposite side of the first and second receiving rollers with respect to the rotating shaft, and is rotatably provided on the base so that it can move forward and backward with respect to the first and second receiving rollers and can fix its own position. , circumscribing the outer periphery of the rotating shaft to connect the rotating shaft to the first
, a push roller that presses against a second receiving roller, and the rotating shaft can be rotated without wobbling between the first and second receiving rollers and the pushing roller. Bearing unit in a player.