JPH0130203B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record adsorption device that firmly adsorbs a record to be played on a turntable of a record reproducing device.

It is well known that warping of records causes unnecessary resonance, which deteriorates the quality of the reproduced sound.
In order to eliminate this problem, a plurality of independent suction cups are formed on the turntable sheet made of an elastic material such as rubber, and these suction cups fix the record by suction, while also correcting the warpage. A turntable sheet has been proposed (for example, see Utility Model Publication No. 56-23775). However, in this sheet, the suction cup is located in the sound groove of the record, which causes air leakage and does not attract enough air, and the record is held so that it is lifted above the turntable sheet. , unnecessary resonance is likely to occur due to factors other than the warping of the record. Another drawback was that it was troublesome to attach and detach the record. On the other hand, a disc-shaped frame forming an air chamber between the lower part of the record is provided, the air in the air chamber is removed with the record placed on it, and the negative pressure is used to move the record into the frame. Patent application 1986-80645 for a record suction board that was made to suction on the top.
(Japanese Unexamined Patent Publication No. 195302). However, this suction cup requires a separate vacuum pump to remove air and a valve to selectively seal the air chamber, resulting in a complicated structure and a correspondingly high production cost. .

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a simple record suction device which can securely suction and fix a record by simple operation and which can be manufactured with a small number of parts.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, this record disc suction device 1 has a bag-shaped cover 2 made of a rubber sheet, and a record disc 3 is placed inside the cover 2.
a disk-shaped substrate 4 having a slightly smaller diameter;
Upper plates 5 of the same shape are placed vertically opposite each other at a predetermined interval. That is, the substrate 4 is fixed on the bottom surface of the cover 2, while the upper plate 5 is fixed to the peripheral wall 6 of the cover 2 above the substrate 4 with an adhesive or the like. The peripheral wall 6 of the cover 2 is formed to have a dogleg-shaped cross section and is bendable, thereby movably supporting the upper plate 5 with respect to the substrate 4. In addition, the substrate 4 and the upper plate 5
There is an air chamber 7 surrounded by this peripheral wall 6 between
is formed. The upper edge of the cover 2 is an annular seal 8 formed to expand outward at a slight upward angle, and inside this seal 8, the outer peripheral edge of the record 3, that is, the group guard portion is placed. They are now in airtight contact. A first insertion hole 10 is formed in the center of the substrate 4, through which a center spindle 9 of a turntable (not shown) is inserted. In this case, a packing 11 is provided in the insertion hole 10 to provide an airtight seal with the center spindle 9, and this packing 11 is integrally connected to the cover 2.
Note that by applying grease or the like to the packing 11, its airtightness can be further improved. Further, a second insertion hole 12 for inserting the center spindle 9 is also formed in the center of the upper plate 5, so that the center spindle 9 passes through the center of the substrate 4 and the upper plate 5. As a result, it protrudes above the upper plate 5. A communication hole 1 is provided at the eccentric position of the upper plate 5.
3 and 13 are formed through which the air in the air chamber 7 can enter and exit. Further, on the lower surface of the upper plate 5, leaf springs 14, 1 extending diagonally downward are provided.
4 is attached, whereby the upper plate 5 is biased in a direction away from the substrate 4. On the other hand, this record disc suction device 1 includes a cap 15 attached to the tip of a center spindle 9 projecting above the top plate 5. An annular seal 16 is fixed to the outer periphery of the lower end of the cap 15 so as to extend diagonally downward. The cap 15 is attached to the center spindle 9 from above by placing the record 3 on the upper plate 5. In this case, this seal 16 is attached to the record 3.
It has become closely attached to the unrecorded band near the label section of .

Next, the operation of this invention will be explained. A record 3 is placed on the upper plate 5 so that its group guard comes into close contact with the seal 8. When the record 3 is pushed down together with the upper plate 5 against the leaf spring 14, the air chamber 7 is compressed, and the air is pumped through the communication holes 13, 13 as shown by the arrows in the figure.
, and escapes to the outside between the group guard of record 3 and seal 8. As a result, as shown in FIG. 2, the peripheral wall 6 of the cover 2 is finally bent, and the distance between the substrate 4 and the upper plate 5 is narrowed. Then, attach the cap 15 to the center spindle 9.
The seal 16 is brought into close contact with the non-recording zone near the label portion of the record disc 3, and the area around the center hole 17 of the record disc 3 is airtightly sealed. When the pressing force is released in this state, the upper plate 5 tries to return upward due to the biasing force of the leaf springs 14, 14, but the air inflow passage is closed.
The air chamber 7 is maintained in a reduced pressure state. Therefore, the record disc 3 is fixed firmly on the top plate 5 by suction so that its warp is corrected by the atmospheric pressure. On the other hand, when removing record 3,
Either remove the seal 8 from the group guard of the record 3 and create a gap in that area to let air flow in, or remove the cap 15 and let air flow in through the gap between the center hole 17 of the record 3 and the center spindle 9. Just let it happen. Then, due to the urging force of the leaf springs 14, 14, the distance between the substrate 4 and the upper plate 5 returns to the state shown in FIG. As a result, the inside of the air chamber 7 becomes atmospheric pressure, so that the record 3 can be easily removed.

In addition, as a modification of the above embodiment, the peripheral wall 6 and the seal 8 may be formed separately and fixed to the substrate 4 and the upper plate 5 without using the cover 2. In addition, seal 8 and seal 1
6 is preferably made from a flexible material such as neoprene rubber. In addition, the peripheral wall 6 is made of an elastic material with a strong self-restoring force, and by utilizing its elasticity,
The upper plate 5 may be biased in a direction away from the substrate 4, and in that case, the leaf springs 14, 14 can be omitted.

As is clear from the description of the embodiments described above, according to the present invention, the record can be completely tightly fixed on the top plate, and excellent sound quality without unnecessary resonance can be expected. Furthermore, the record can be attached and detached by simple operations.
Furthermore, the structure is very simple compared to conventional ones, the number of parts is small, and each part can be easily processed, so it can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a record disc suction device according to the present invention, and FIG. 2 is an explanatory diagram of its operation. In the figure, 1 is a record adsorption device, 2 is a cover,
3 is a record disc, 4 is a base, 5 is a top plate, 6 is a peripheral wall, 7 is an air chamber, 8 is a seal, 9 is a center spindle, 10 and 12 are center spindle insertion holes, 1
3 is a communication hole, 14 is a leaf spring, 15 is a cap, 1
6 is a seal.

Claims (1)

[Claims] 1. A record adsorption device disposed between the turntable and the record to hold the record on a turntable having a center spindle, the center spindles being coaxially bored with each other at the center. A pair of substrates and an upper plate, each having a first insertion hole and a second insertion hole for the purpose of a bendable peripheral wall forming an air chamber therebetween; and an upper surface of the upper plate that is in airtight contact with the outer periphery of the record to form an airtight space between the record and the upper plate. a sealing member provided in an annular shape on the outer periphery, a communication hole bored in the upper plate so as to communicate the space and the air chamber, and located between the substrate and the upper plate, an elastic means biasing the gap in a direction to widen the gap therebetween;
a cap attached to the tip of the center spindle projecting upward through the insertion hole and airtightly sealing the periphery of the first insertion hole, the record disc being placed on the upper plate; , by attaching the cap to the tip of the center spindle and bringing the record disc closer to the substrate together with the cap, the air in the air chamber is caused to flow between the communication hole, the outer periphery of the record disc, and the sealing member. A record disc suction device, characterized in that the air in the air chamber is brought into a reduced pressure state by being discharged through a joint, and the record disc is suctioned and fixed onto the upper plate.