JPS6020166Y2 - turntable device - Google Patents

Description

[Detailed description of the invention] The present invention aims to increase the amount of air discharged to attract the record onto the turntable, thereby ensuring that the record is attracted to the turntable.In addition, the turntable has a structure that can simplify machining. The purpose is to provide a table device.

The present applicant previously proposed a turntable device having the configuration shown in FIG. 1 as a device for sucking a record disc onto a turntable.

This device has a structure in which a spindle 2 supported by a bearing body 1 is provided with an axial hole 2a and upper and lower diametric holes 2b and 2c.

The record disc 3 has air in the groove 4a of the turntable 4 in the central recess 4b, the upper diametrical hole 2b, and the axial hole 2as.
It is sucked onto the turntable 4 by being discharged to the outside by the suction pump 6 through the T-portion diametrical hole 2C1 and the discharge port 5.

Here, in order to reliably adsorb the record 3 (especially a warped record) onto the turntable 4, the air pressure inside 14a must be low and the flow rate of air discharged to the outside per hour must be large. is required.

In particular, in order to increase the discharge flow rate, the cross-sectional area of the flow path needs to be large.

In the case of the above device, the lower suction amount is the opening of the upper diametrical hole 2b of the spindle 2.

Here, since the diameter of the upper part of the spindle 2 is determined to be about 7.15 mm or less and is small, the diameter of the diametrical hole 2b is naturally small, and the number of holes 2b is also reduced.

This limits the ability to increase the total area of the suction openings, reduces the discharge flow rate, and poses a problem in that it is difficult to reliably suction especially if the record is warped.

Further, there was a problem in that it was extremely difficult to drill a hole in the small diameter spindle 2 due to the hardness of the material.

The present invention solves the above-mentioned problems, and an embodiment thereof will be described below with reference to the drawings.

FIG. 2 is a partially cutaway vertical sectional view of an embodiment of the turntable device according to the present invention, and FIG. 3 is an exploded perspective view of the main parts of the present invention.

The tapered structure 10 has a center hole 11 of the turntable 11.
A large-diameter tapered portion 10a that fits into the center hole 3a of the record disc 3, a protrusion 10b that fits into the center hole 3a of the record disc 3, and a hole 10c that fits into the bottomed cylindrical body 12 are integrally formed. is fitted onto the top of the cylindrical body 12 and fixed to the top of the cylindrical body 12.

The cylindrical body 12 is rotatably supported within a shaft support 14 with a concave portion 12a at the bottom supported by a steel ball 13.

As described above, since the tapered structure 10 is integrally formed with the tapered part 10a1, the protrusion 10b1, and the hole 10c, the axes of each part can be aligned with high precision, and the cylindrical body 12 and the tapered structure 10 Even in a configuration in which the protruding portion 1 ob and the tapered portion 10 a are made to coincide with the axial center of the cylindrical body 12 .

Further, the turntable 11 is almost the same as the conventional one, and no special design changes are required.

The turntable 11 is mounted at a height position such that its upper surface coincides with the upper surface of the tapered portion 10a.
The upper part of the turntable 11 protrudes into the central recess 11b of the turntable 11.

10, - are diametrical holes, and a plurality of holes are formed near the top of the tapered portion 10a.

Here, since the diameter of the tapered portion 10a is several times the diameter of the protrusion 10b, the diametric hole 10 knee 1 with a large diameter d can be formed without impairing mechanical strength.

Each diametrical hole 10. The portion of -□ facing the central recess 11b becomes the suction opening 15, and the total area of the suction opening 15 is approximately equal to or larger than the cross-sectional area of the flow path of the cylindrical body 12.

Here, since the tapered part 10a is used as the large diameter part forming the suction opening 15, there is no need to separately provide a large diameter part, and the structure is simplified, and the large diameter part is attached to the turntable. There is no need to provide a special setting.

Further, since the tapered portion 10a has a large diameter, machining for drilling the diametrical hole 10a-1 is relatively easy.

When the record disc 3 is placed on the turntable 111 and the suction pump 6 is activated, the upper surface groove l of the turntable 11
The air inside the ie flows through the central recess 11b and the plurality of suction openings 15.
The record disc 3 is discharged to the outside through the bottomed cylindrical body 12, the lower opening 12b1 space 16, and the large-diameter discharge port 17, and the record disc 3 is attracted onto the turntable 11.

Here, since the total area of the suction openings 15 is quite large, the inconvenience of the air discharge flow rate being unduly restricted at this point does not occur, and the air is drawn to the maximum allowable by the flow path diameter of the bottomed cylindrical body 12. It can be quickly discharged at a flow rate per hour.

Thereby, the record 3 is reliably attracted onto the turntable 11 even if there is a relatively large warp.

Note that when a turntable sheet is used, the tapered structure 10 is installed at the same height as the top surface of the turntable sheet or the same height as the top surface of the turntable 11.

In the former structure, the record is placed on the upper surface of the tapered part 10a, and in the latter structure, the turntable sheet is placed on the tapered part 10a, and both the turntable sheet and the record are placed on the turntable. It is adsorbed.

Note that since no hole is formed inside the protrusion 10b, the mechanical strength is not impaired in any way.

Further, since the spindle is structured to be divided into the tapered structure 10 and the bottomed cylindrical body 12, each component can be manufactured by relatively simple machining.

As described above, according to the turntable device of the present invention, there is a tapered portion that fits into the center hole of the turntable, a protrusion that fits into the center hole of the record, and a projection that is formed on the tapered portion and extends from the top surface of the turntable. a taper structure having a hole having a suction opening opening in the axial direction; Since the structure consists of a cylindrical body, it is possible to form a suction opening of the necessary area without separately providing a special large-diameter member, and it is also possible to eliminate the need for a special structure for the turntable. Air can be expelled quickly, even warped records can be reliably attracted to the turntable, and the large diameter of the tapered section makes machining the suction opening relatively easy. Moreover, since the taper structure and the cylindrical body are separate bodies and are combined after machining, it has advantages such as easier machining than when they are integral.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway vertical sectional view of an example of a conventional turntable device, FIG. 2 is a partially cutaway vertical sectional view of an embodiment of the turntable device of the present invention, and FIG. 2 is a perspective view showing the bottomed cylindrical body and the suction opening forming member taken out from FIG. 2; FIG. 3...Record, 3a...Center hole,
6... Suction pump, 10... Taper structure, 10a... Taper part, 10□-1...
...Diameter hole, 10b... Protrusion, 10c.
...hole, 11 ... turntable, 1
1a...Center hole, llb...Central recess, llc...Groove, 12...Bottomed cylindrical body, 14...Shaft Support, 15... Suction opening,... Discharge port. 16...Space part, 17...

Claims (1)

[Scope of utility model registration request] In a turntable device that suctions air above a turntable through a suction opening to attract a record onto the turntable, a tapered portion that fits into a center hole of the turntable and a tapered portion that fits into a center hole of the record. and a hole formed in the tapered part and having a suction opening that opens on the top surface of the turntable. A turntable device comprising a cylindrical body rotatably supported within a support body and having the tapered structure coupled to the top.