Classifications

• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
  • G11B17/02—Details
  • G11B17/022—Positioning or locking of single discs
  • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation

Definitions

• the invention relates to a device for suctioning a disc on the turntable of a turntable with a suction pump, which is connected via a suction line provided with a one-way valve to the underside of the plate and with an annular seal that extends from below to the outer edge of the plate is present.
• a sealing washer provided on the plate axis seals the axis hole of the plate. In this way, a vacuum can be generated between the plate and the turntable by means of the suction pump, which holds the plate pressed against the turntable.
• This known suction device is integrated in the record player.
• the invention has for its object to provide a suction device that can be used as an accessory for any turntable.
• the above-mentioned device is further characterized by a disc-shaped plate support, which essentially corresponds in diameter to the plate, which has a central, sealed hole for the plate axis and the outer circumference of the annular seal, with a a sealing ring on the inner edge of the plate attachable bell, which has a central hole for the plate axis and at least one sucking opening in its bottom surface facing the plate, and by a one-way valve provided for the suction line, which connects with the space between the plate and the plate support is connected.
• the device according to the invention represents an accessory that can be used with any commercially available record player.
• the plate support is placed on the turntable of the commercially available turntable, the central hole of the plate support being sealed against the axis of the plate.
• the vacuum is generated by means of the suction pump.
• the suction cup serves as a seal for the passage of the plate axis through the axis hole of the plate.
• the suction line of the suction pump is removed from the connecting piece, the one-way valve preventing air from flowing into the vacuum chamber.
• the plate support can be a rigid disc which is sealed by a sealing ring against the plate axis and on the outer circumference of which the annular seal is attached.
• the platter support in this case is e.g. made of die-cast zinc or a corresponding non-magnetic material.
• the plate support is made of a rubber-elastic material.
• the seal against the plate axis by a one-piece with the plate support from this rubber-elastic material formed sealing lip can be effected.
• the ring-shaped seal on the outer circumference is also made in one piece with the plate support from the rubber-elastic material.
• the plate support is glued to the platter so as not to impair the running properties of the platter.
• the plate support can have an adhesive coating on the underside or can be glued on using a double-sided adhesive film.
• a buffer volume which is also under pressure is provided.
• This buffer volume is obtained in the simplest case through the dome-shaped design of the suction bell.
• the plate support is rigid, it is also possible to provide this with an inner cavity, e.g. to be double-walled, the inner cavity being connected to the negative pressure space between the plate and plate support.
• the simplest design connection of the suction pump is to the suction bell.
• the connecting piece can also be attached to the outer circumference of the plate support and open radially into this inner cavity.
• the connecting piece can also be attached to the outer circumference of the plate support and open radially into this inner cavity.
• the connecting piece is expediently provided in the surface of the plate support, into which the bore coming from the connecting piece opens.
• This groove can be a V-shaped recess, for example, in which a round cord seal is inserted as an annular seal.
• the suction cup can expediently be provided with a ventilation valve in order to make it easier to remove the suction cup and the plate after playing.
• FIG. 1 An exemplary embodiment of the invention illustrated in the drawing is explained in more detail below.
• the single figure shows a vertical axial section through a turntable of a conventional turntable provided with the device according to the invention.
• a disc-shaped plate support 14 is placed on the turntable 10.
• the diameter of the plate support 14 corresponds to the turntable 10 or the standardized plates.
• the plate support 14 sits with a central hole on the plate axis 12, wherein a sealing ring 16, for example an O-ring, seals between the plate support 14 and the plate axis 12.
• the plate support 14 is made, for example, of die-cast zinc or a corresponding non-magnetic material, so that the smoothness of the turntable 10 does not deteriorate.
• the plate support 14 On the outer circumference, the plate support 14 has a step-shaped recess 18 on its upper side. In the upper peripheral edge of this recess 18, an oblique groove is provided, in which a sealing lip 20 made of a rubber-elastic material and running around the circumference of the plate support 14 is inserted.
• the plate 22 to be played is placed on the plate support 14, the sealing lip 20 engaging from below on the outer edge of the plate 22 which is not provided with the sound track.
• the plate 22 presses the sealing lip 20 downward. Since the sealing lip 20 projects obliquely upward and radially outward beyond the recess 18, it can counteract its own elasticity through the edge of the plate 22 are freely pressed down so that they can create a good seal over the entire circumference of the edge of the plate 11.
• the lower, radially projecting edge of the recess 18 also projects radially beyond the sealing lip 20 and protects it from mechanical damage.
• the plate support 14 removed from the record player can in this way be stored, for example, standing vertically.
• the plate support 14 consists of a rubber-elastic material and is glued to the turntable 10, for example by means of a double-sided adhesive film.
• the sealing lip 20 is integrally formed with the plate support 14.
• the sealing ring 16 is also replaced by a sealing lip on the plate axis 12, which is formed in one piece with the plate support 14.
• a suction cup 24 is placed on the plate 22 from above.
• the dome-shaped suction bell 24 has the shape of a cylinder closed at the top and bottom. Their diameter corresponds essentially to the diameter of the labels of standardized records.
• a central hole 28 is provided in the lower bottom surface 26 facing the plate 22, through which the plate axis 12 passes for centering and holding the suction bell 24.
• a sealing ring 30, e.g. an O-ring which causes the seal between the suction cup and plate 22.
• Two suction openings 32 in the bottom surface 26 establish the connection of the inner volume of the suction bell 24 with the space between the suction bell 24 and the plate 22 and via the axis hole of the plate 22 with the space between the plate 22 and the plate support 14.
• the lower bottom surface of the suction bell 24 can also be completely open, so that no suction openings 32 have to be provided.
• the central hole 28 is then formed on a projection of the suction bell 24 leading downward from the upper cover surface.
• a connecting piece 24 is inserted, which contains a one-way valve 36.
• a suction line, not shown, of a suction pump, also not shown, is removably connected to the connecting piece 34.
• the one-way valve 36 ensures that air can be pumped out of the suction bell 24 via the connecting piece 34, but prevents inflow of air after the suction line has been removed when playing the plate 22.
• a ventilation valve 38 is also provided in the upper cover surface of the suction bell 24. This vent valve 38 enables e.g. by depressing an actuating button, venting the suction bell 24 if it is to be removed after playing the plate 22.
• Radial ventilation grooves are provided in the upper surface of the plate support 14, starting from the central hole in the plate support 14 and extending almost to the sealing lip 20. These ventilation grooves have the effect that the air is also reliably sucked out of the radially outer regions between the plate support 14 and the plate 22, even if the plate 22 already lies tightly against the plate support 14 in its radially inner regions.

Landscapes

• Holding Or Fastening Of Disk On Rotational Shaft (AREA)
• Cameras Adapted For Combination With Other Photographic Or Optical Apparatuses (AREA)

Priority Applications (1)

Applications Claiming Priority (4)

Publications (1)

Family

ID=25948911

Family Applications (1)

Country Status (4)

Citations (7)

• 1982
  • 1982-03-16 AT AT82102115T patent/ATE9416T1/de not_active IP Right Cessation
  • 1982-03-17 WO PCT/EP1982/000055 patent/WO1982003291A1/de not_active Ceased
  • 1982-03-17 JP JP57501012A patent/JPS58500305A/ja active Pending
  • 1982-11-10 DK DK500882A patent/DK500882A/da not_active Application Discontinuation

Patent Citations (7)

Non-Patent Citations (1)

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