JPS5817503A - Sucking device for phonograph record - Google Patents

Abstract

PURPOSE:To suck a phonograph record onto a disk, by coupling two disks at their external circumferences through bellows, sucking air into the bellows through a spring plate which applies a force in such a direction that the bellows expand, and utilizing the air pressure. CONSTITUTION:This phonograph record sucking device 1 has a cover formed of a rubber sheet in a bag shape and a partitioning wall 12, and in this cover 2, a discoid base plate 4 having a little bit smaller diameter than a phonograph record 3 and an upper plate 5 having the same diameter are opposed vertically to each other at a certain interval. The phonograph record 3 is placed on the upper plate 5 with its groove guard in tight contact with an outer seal 7., and is pressed down against a leaf spring 15 together with the upper plate 5. In this state, releasing the pressing force allows the upper plate 5 to return upwardly by the force of the leaf spring 15, but an air inflow passage is sealed, so the phonograph record 3 is sucked onto the top surface of the upper plate 5.

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 turntable sheet made of an elastic material such as rubber is formed with a plurality of independent suction cups, and these suction cups hold the record in place and correct the warping of the turntable. A sheet has been proposed (for example, see Utility Model Publication No. 56-23775). However, with this sheet, the suction cup is located in the sound groove of the record, which causes air leaks and does not attract enough air, and the record is held so that it is lifted above the sheet, so the record Unwanted resonance is likely to occur due to factors other than warping of the board. Furthermore, there was a drawback that the operation of attaching and detaching the record was troublesome. On the other hand, a disc-shaped frame that forms an air chamber between the bottom of the record and the bottom of the record is provided.
A record suction board has been proposed in Japanese Patent Application No. 56-80645, etc., in which air is removed from the air chamber while a record is placed thereon, and the negative pressure is used to attract the record onto a frame. However, this suction cup requires a separate vacuum pump to evacuate the air and a valve to selectively seal the air chamber, making the structure complex and resulting in an increase in production costs. .

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

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a record disc suction device 1 according to the present invention has a cover 2 formed in the shape of a bag from a rubber sheet. A disk-shaped substrate 4 having a diameter of , and an upper plate 5 having the same diameter are placed vertically opposite each other at a predetermined interval. That is, the substrate 4 is fixed to the bottom surface of the cover 24, while the upper plate 5 is fixed to the bottom surface of the cover 24.
It is fixed to the peripheral wall 6 of the cover 2 above with adhesive or the like. In this embodiment, the peripheral wall 6 of the cover 2 is formed to have a dogleg-shaped cross section so as to be freely bendable, so that the upper plate 5 is movably supported with respect to the substrate 4. In this embodiment, the upper edge of the cover 2 is an annular outer seal 7 formed to expand outward at a slight upward angle. The group guard is now in close contact. A first insertion hole 9 is formed in the center of the substrate 4, through which a center spindle 8 of a turntable (not shown) is inserted. In this case, a backing 10 is provided in the first insertion hole 9 to provide an airtight seal with the center spindle 8, and this backing 10 is integrally connected to the cover 2. Also, the upper plate 5
There is also a second hole in the center for inserting the center spindle 8.
An insertion hole 11 is formed, so that the center spindle 8 passes through the center of the substrate 4 and the upper plate 5 and projects onto the upper plate 5. Furthermore, a partition wall 12 is provided concentrically between the substrate 4 and the upper plate 5 to form an annular air chamber 13 together with the peripheral wall 6 described above.

The partition wall 12 is made of a rubber sheet similarly to the peripheral wall 6, and is formed to have a dogleg-shaped cross section, for example, so as to be bendable.

In connection with this air chamber 13, a communication hole 14.1 is provided in the upper plate 5.
4 is formed. Further, leaf springs 15, 15 are attached to the lower surface of the upper plate 5 and extend diagonally downward, thereby urging the upper plate 5 in a direction away from the substrate 4. On the other hand, on the upper surface of the upper plate 5, in addition to the outer seal 7, an annular inner seal 16 centered around the second insertion hole 11 is provided. This inner seal 16
is arranged so as to be in close contact with the non-recording zone near the label section of the record disc 3, and creates an airtight space between it and the outer seal 7 when the record disc 3 is placed. Note that this space communicates with the air chamber 13 through the communication hole 14 described above.

Next, we will explain the operation of this invention.
is placed on the upper plate 5 so that the group guard is in close contact with the outer seal 1. When the record 3 is pushed down together with the upper plate 5 against the leaf spring 15, the air chamber 13
The compressed air passes through the communication holes 14, 14, as indicated by the arrows in the figure, and is further discharged to the outside from between the record 3 and the outer seal 7. by this,
Finally, as shown in FIG. 3, the peripheral wall 6 of the cover 2
is bent, and the distance between the substrate 4 and the upper plate 5 is narrowed.

In this way, the outer seal 7 is brought into close contact with the group guard of the record disc 3, the inner seal 16 is brought into close contact with the non-recording zone inside the record disc 3, and the air chamber 1
3 is in a sealed state. If you release the pressing force in this state,
The upper plate 5 tries to return upward due to the biasing force of the leaf springs 15, 15, but since the air inflow passage is closed, the air chamber 13 is maintained in a reduced pressure state. As a result, the record 3 is firmly attracted to the upper surface of the upper plate 5 so that its warp is corrected. On the other hand, when removing the record 3, the outer seal may be peeled off to create a gap between the outer seal and the record 3 to allow air to flow in. Then, due to the biasing force of the plate springs 15 and 15, the distance between the base plate 4 and the upper plate 5 returns to the state shown in FIG. 1, and the air chamber 13 is released from the reduced pressure state, so the record 3 can be easily removed. be able to.

Incidentally, as a modification of the above-described embodiment, the peripheral wall 6 and the outer seal 7 may be formed separately and fixed to the substrate 4 and the upper plate 5 without using the cover 2. It should be noted that seals 7 and 16 are preferably made of a flexible material such as neoprene rubber. Alternatively, the peripheral wall 6 may be made of an elastic material with strong self-restoring properties, and its elasticity may be used to urge the upper plate 5 away from the substrate 4. In that case, the leaf springs 15, 15 can be omitted. As is clear from the description of the embodiments described above, according to the present invention, it is possible to completely tightly fix the record 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, FIG. 2 is a plan view of FIG. 1 with the record disc removed, and FIG. 3 is an explanatory diagram of the operation. In the figure, l is a record disc suction device, 2 is a force 1 (-13 is a record disc, 4 is a substrate, 5 is an upper plate, 6 is a peripheral wall, 7 is an outer seal, 8 is a center spindle, 9.11 is an insertion hole , 12 is a partition wall, 13 is an air chamber, 14 is a communication hole, 15
1 is a leaf spring, and 16 is an inner seal.

Claims (1)

[Claims] In order to hold a record on a turntable having a center spindle insertion hole, a record adsorption device is provided between the turntable and the turntable, the center spindles being coaxially drilled in the center. A pair of substrates and an upper plate each having a first insertion hole and a second insertion hole and arranged one above the other with an appropriate interval, and a bendable plate connecting the outer peripheries of the substrate and the upper plate. a surrounding wall,
a bendable partition wall that is located between the substrate and the upper plate and is provided to form an annular air chamber together with the peripheral wall; and a partition wall that is in close contact with each of the outer peripheral edge and the inner peripheral edge of the record disc, and is provided between them. an outer seal and an inner seal provided concentrically on the outside and inside of the upper plate, respectively, so as to form an airtight space, and the space and the air chamber formed by these seals. A communication hole is formed in the upper plate so as to communicate with each other, and an elastic means is provided between the base plate and the upper plate and biases the record in a direction to increase the distance between the base plate and the upper plate. By placing the record on the substrate and bringing it closer to the substrate, the air in the air chamber is discharged through the communication hole and between the outer periphery of the record and the outer seal, and the air chamber is brought into a reduced pressure state. A record disc suction device characterized in that the record disc is thereby suctioned and fixed onto the upper plate.