JPS6367244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record peeling device for a record player that can rapidly peel a record attracted to a turntable from the turntable.

2. Description of the Related Art Conventional record players are known in which records are attracted to a turntable to improve the quality of reproduced sound. This device seals between the turntable and the record placed on the record mounting surface of the turntable from the outside by a sealing member provided on the outer periphery of the turntable. The air between the record and the record mounting surface is sucked out by a vacuum pump connected to the passage formed in the rotating shaft of the turntable so as to open to the record mounting surface, and the air is transferred to the turntable. It absorbs records.

However, in conventional record players of this type, since air was simply introduced into the passageway in order to separate the record from the turntable, it took some time to separate the record from the turntable. Additionally, there was a situation in which some noise was generated due to the operation of the vacuum pump when the record was attracted to the turntable.

This invention was made in view of the above circumstances,
A switching valve is connected to a passage formed in the turntable and the rotating shaft of the turntable so as to open to the record mounting surface of the turntable, and a first tank is connected to the switching valve, and a first tank is connected to the switching valve. The exhaust port of the vacuum pump enclosed in the
By selectively connecting the passage to the first tank and the second tank by switching the switching valve, the record can be rapidly peeled off from the turntable. It is an object of the present invention to provide a record peeling device for a record player that can prevent the generation of noise when a record is attracted to a turntable.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Reference numeral 1 in FIG. 1 is a board of a record player case, and a bearing 2 is attached to this board 1. The bearing 2 consists of a receiving portion 3, a floating plate 4, and a rotating shaft 5. The receiving portion 3 is fixed to the substrate 1, and a recess 6 and a through hole 7 are formed in the receiving portion 3. The rotating shaft 5 is fitted into the center of the receiving part 3, and a through hole 7 is formed in the center of the rotating shaft 5.
A communication hole 8 communicating with is formed. Levitation plate 4
is fitted onto the rotating shaft 5 and rotatably fitted into the recess 6. A spiral groove 9 is formed on the lower surface of the floating plate 4, and oil is sealed between the bottom surface of the recess 6 and the lower surface of the floating plate 4. A turntable 10 is fitted onto the rotating shaft 5 and fixed to the floating plate 4 on the bearing 2 .

The turntable 10 includes a turntable main body 1
1, a ring 12, and a suction cup 13. The turntable 10 is connected to a phono motor (see FIG. (not shown). A recess 1 is provided on the top surface of the turntable body 11.
4. Annular grooves 15 and 16 are formed. An elastic member 17 made of rubber is fitted into the annular groove 15 . A ring 12 is fitted into the recess 14, and a suction cup 13 is fitted into the ring 12. A center pin 18 is provided at the center of the suction cup 13, and a T-shaped communication hole 19 is formed in the center pin 18. This communication hole 19 is communicated with the communication hole 8. Further, a space 20 surrounding the center pin 18 is formed in the suction cup 13. Annular seal members 21 and 22 are attached to the outer periphery and the vicinity of the center of the upper surface of the suction cup 13, respectively. Further, a plurality of small holes 23 are formed in the suction cup 13 so as to be located immediately outside the seal member 22. These small holes 23 are communicated with the space 20. A record 24 is placed on the suction cup 13 with its center hole fitted into the center pin 18.

One end of a hose 32 is attached to the lower part of the receiving part 3 via a hose joint 31, and this hose 3
A switching valve (3 port 2 position switching solenoid valve) 33 is connected to the other end of 2. Note that the hose 3
2, hose joint 31, through hole 7, communication hole 8, 1
9, the space 20, and the small hole 23 form a passage 30. A first tank 35 is airtightly connected to the switching valve 33 via a pipe 34. 1st
The inner surface of the outer wall of the tank 35 is covered with a soundproofing material (a layered material made of flexible skin, lead, sponge rubber, and lead).
35a is attached. A vacuum pump 36 is operatively enclosed within the first tank 35 . Reference numeral 37 denotes a power cord for operating the vacuum pump 36, which passes through the wall of the first tank 35 in an airtight manner. Further, one end of a pipe 38 that penetrates the wall of the first tank 35 in an airtight manner is connected to the discharge port of the vacuum pump 36. The other end of the piping 38 is located outside the first tank 35, and a second tank 39 is airtightly connected to this other end.
This second tank 39 is connected to the switching valve 3 via piping 40.
3 is hermetically connected. Note that the second tank 39 is provided with a safety valve 41. Further, the power cord 37 of the vacuum pump 36 and the power cord 42 of the switching valve 33 are connected to a power source via an automatic control device (not shown).

When playing a record, the record 24 is placed on the suction cup 13 with its center hole fitting into the center pin 18. As a result, the outer circumferential portion and the central portion of the lower surface of the record 24 come into contact with the sealing members 21 and 22, and air is sealed from entering and exiting these portions.

Next, the turntable 10 is shown in FIG.
When rotated clockwise as viewed from the direction of arrow A (the rotational direction of the record 24 when playing the record), the floating plate 4 rotates together with the turntable 10. Then, the oil between the bottom surface of the recess 6 and the lower surface of the floating plate 4 is guided into the groove 9 and gathers toward the center of the recess 6, increasing the pressure and floating the turntable 10 to a predetermined height. Oil overflowing into the center of the recess 6 is returned to the outer periphery of the bottom surface of the recess 6.

Here, the switching valve 33 is connected to the hose 32 and the piping 34.
When the vacuum pump 36 is operated, the inside of the first tank 35 becomes negative pressure,
Piping 34, switching valve 33, hose 32, hose joint 31, through hole 7, communication holes 8, 19, space 20,
The air between the lower surface of the record 24 and the suction cup 13 is sucked into the first tank 35 and the vacuum pump 36 through the small hole 23, and the record 2 is sucked into the suction cup 13.
4 is adsorbed. At this time, the air sucked into the vacuum pump 36 is discharged from the discharge port of the vacuum pump 36, passes through the piping 38, and is stored in the second tank 39, and its air pressure increases. When the air pressure in the second tank 39 exceeds a predetermined set pressure, the safety valve 41 opens to keep the air pressure in the second tank 39 below the set pressure. In addition, the suction cup 13
When the degree of vacuum in the first tank 35 reaches a set value when the record 24 is attracted to the record 24, the vacuum pump 36 is automatically stopped by a control device (not shown).

In this state, the cartridge is lowered together with a tone arm (not shown) onto the record 24, and the record is played. After the record is played, the tone arm is removed from the record 24 and placed on an armrest (not shown).

Thereafter, in order to separate the record 24 from the suction cup 13, the switching valve 33 is switched to connect the hose 32 and the pipe 40. Then, vacuum pump 3
The air suction between the record 24 and the suction cup 13 is stopped, and the high pressure air in the second tank 39 is transferred to the pipe 40, the switching valve 33, the hose 32,
It passes through the hose joint 31, the through hole 7, the communication holes 8 and 19, the space 20, and the small hole 23, and rapidly flows into between the record 24 and the suction cup 13. As a result, the record 24 is pressed upward by this air pressure, so that the record 24 can be rapidly peeled off from the suction cup 13. In addition, if the air pressure in the second tank 39 is adjusted to an appropriate pressure, the record 24 will not be blown up from the suction cup 13 more than necessary and the record 24 will not be damaged. Further, the vacuum pump 36 is installed in the first tank 35, and after the record playing is finished, the vacuum pump 36 is pumped between the record 24 and the suction cup 13 from the second tank 39 as described above. Since a vacuum state is maintained even when high-pressure air is supplied to Of course, even in normal times, the sound of the operation of the vacuum pump 36 is difficult to be transmitted to others, so there is almost no noise generated by the operation of the vacuum pump 36.

As explained above, according to the present invention, a switching valve is connected to the turntable and the passage formed in the rotation shaft of the turntable so as to open to the record mounting surface of the turntable, and the switching valve is connected to the first
tank is connected, and the exhaust port of a vacuum pump sealed and installed in the first tank is connected via a second tank, and the passage is connected to the first tank and the second tank by switching the switching valve. Since the configuration is such that the first tank is selectively connected to the first tank, the vacuum pump can be operated to create a vacuum state in the first tank, and the record can be sucked to the suction cup for high-fidelity playback. The discharge air from the vacuum pump can be
The air stored in the second tank and brought to high pressure in this second tank is guided between the record and the suction cup by switching the switching valve, so that the record can be rapidly peeled off from the suction cup after the record is played. Furthermore, since the vacuum pump is installed in the first tank, the operation sound of the vacuum pump is difficult to be transmitted to other parts, and therefore, it is possible to prevent the generation of noise due to the operation of the vacuum pump.

[Brief explanation of drawings]

The drawing is a partially omitted vertical sectional view showing an embodiment of the present invention. 5... Rotation axis, 10... Turntable, 2
1, 22... Seal member, 24... Record, 3
0... Passage, 33... Switching valve (3 port 2 position switching solenoid valve), 35... First tank, 36... Vacuum pump, 39... Second tank.

Claims (1)

[Claims] 1. A sealing member provided at least on the outer periphery of the turntable ensures that the turntable and
The gap between the turntable and the record placed on the record mounting surface is sealed from the outside, and the turntable and the rotating shaft of this turntable are connected through a passage formed to open to the record mounting surface. In the record player, a vacuum pump connected to the passage sucks out air between the record and the record mounting surface to attract the record to the turntable. a first tank airtightly connected to the switching valve;
a vacuum pump which is operably installed in a tank and whose discharge port is hermetically connected to the switching valve through the second tank, and the passage is opened by switching the switching valve. A record peeling device for a record player, characterized in that it is selectively connected to the first tank and the second tank.