US3833225A - Driving mechanism for the turntable in record players - Google Patents

Driving mechanism for the turntable in record players Download PDF

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Publication number
US3833225A
US3833225A US00291525A US29152572A US3833225A US 3833225 A US3833225 A US 3833225A US 00291525 A US00291525 A US 00291525A US 29152572 A US29152572 A US 29152572A US 3833225 A US3833225 A US 3833225A
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Prior art keywords
driving wheel
motor
rotation
turntable
driving
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Expired - Lifetime
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US00291525A
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English (en)
Inventor
K Pettersson
G Logue
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Industriaktiebolaget Luxor
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Industriaktiebolaget Luxor
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Publication of US3833225A publication Critical patent/US3833225A/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/26—Speed-changing arrangements; Reversing arrangements; Drive-transfer means therefor

Definitions

  • ABSTRACT S A driving mechanism for the turntable in record playept. 27, 1971 Sweden 12154/71 ers having a reversible motor is provided in which reversal of the direction of rotation of the motor autog 274/9 matically changes the speed of rotation of the tumtable Field of Search 274/9, 39
  • the present invention relates to a driving mechanism in record'players for driving the turntable with two different speeds.
  • the French specification No. l 425 761 discloses a record player in which the turntable on its bottom side has two concentric flanges between which a driving wheel driven by a motor may be moved into engagement with one or the other of said flanges.
  • the setting of the desired speed of the turntable is effected by means of a manually operated control member which 'actuates the said driving wheel to move it ,into one or the other driveengagement position in a purely mechanical way at the same time as the motor is given a reversed direction of rotation by means of an electrical reversing switch.
  • the control member has to be mechanically connected with the driving wheel, or partsassociatedtherewith, difficultiesmay arise in locating the control member where this would be desirable for other reasons. If the actuationcould be effected in a purely electrical way, the control member could be located practically anywhere.
  • this problem is solved by causing the rotation of the motor to produce torques which result in the setting of the position of the driving wheel.
  • the record player comprises a base plate, a shaft carried by said base plate, a turntable mounted on said shaft, a reversible motor carried by said baseplate, the turntable, or a disc drivingly connected therewith, being provided with an outer circular flange and with an inner circular flange between which a driving wheel adapted to be driven by the said motor and forming a driving unit therewith is movable into engagement by its periphery with either the outer flange positioned radially outside the driving wheel, or with the inner flange positioned radially inside the driving wheel so as thereby to cause rotation of the turntable always in the same direction by selecting opposite direction of rotation of the motor depending upon whether the driving wheel is in engage- .ment with the outer or with the inner of said flanges,
  • the driving wheel being mounted rotatable in a support means which is provided about a pivot axis which is separate from the axis of rotation of the driving wheel, a braking means adapted to brake a part pertaining to said driving unit and rotating at the rotation of the motor, in order to turn said support means about its pivot axis through a torque arising as a reaction of said braking, so that the driving wheel is moved into engagement with one of said flanges when the motor rotates in a first direction, and with the other of said flanges when the motor rotates in the opposite direction.
  • FIG. 1 illustrates a record player provided with the device of the invention, as seen from the top;
  • FIG. 2 represents an electrical circuit for the motor of the same record player
  • FIG. 3 illustrates, at an enlarged scale, a detail of the driving device,'and
  • FIG. 4 illustrates, also at an enlarged scale, a corresponding detail of a modification of the driving device.
  • 1 is the base plate of the record player, 2 its pickup arm and 3 its turntable which is rotatably mounted about a vertical shaft 4.
  • the bottom side of the turntable 3 is provided with a pair of depending circular flanges 5 and 6.
  • a motor plate 8 in which a motor 9 is resiliently suspended (the springs 10).
  • the driving shaft of the motor is provided with a pulley 11 which via a belt 12 is drivingly associated with another pulley 13 fixedly connected with a driving wheel 14 for alternative driving engagementwith the flanges 5 and 6.
  • pulley l3 and the driving wheel 14 are arranged is best seen from FIG. 3. These two members are rotatable about a vertical shaft 15, which in turn is rotatably mounted in a bracket 16. This is pivotally mounted about a vertical shaft 17 secured in the base plate 1.
  • the shaft 15 has secured to it, under the pulley 13, a friction disc 18 as well as, under the latter, a small gear 19 which is in mesh with a large gear 20 rotatable about a shaft 21 provided in the bracket.
  • a friction disc 18 Under the pulley 13 there are fixed to it a pair of pins 22 and 23 in which there are fixed blade springs 24 which with the interpositioning of friction felt 25 embrace the friction disc 18.
  • a latch'26 pivotally mounted in the motor plate 8.
  • This latch is coupled in a way not shown to the pickup arm 2 of the record player, so that, when the pickup arm is resting on its support, the latch 26 is moved in the direction of the arrow 27, wherebythe device shown in FIG. 3 is free to move to such extent-as is allowed by the play between the driving wheel 14 and the flanges 5 and 6.
  • the motor 9 is preferably of a self-starting synchronous type.
  • FIG. 2 the electrical arrangement of the motor is shown.
  • the mains voltage is applied between the terminals 28 and 29.
  • the switch of the motor is designated by 30, the motor windings by 31 and 32 and a condenser by 33.
  • the motor is reversed by means of a reversing switch 34.
  • the pickup arm 2 is shown in a raised position and the switch 34, which according to the invention may be located at any suitable place on the record player, is set in such a position that the motor 9 with the pulley 11 will rotate clockwise.
  • the latch 26 is in engagement with the gear 20, whereby the shaft 15 is blocked against rotation via the gear 19.
  • the left-hand part of the belt 12 will be the pulled one.
  • FIG. 4 A modification of the driving wheel device according to FIG. 3 is shown in FIG. 4.
  • the driving wheel 14 and the pulley 13 are rotatable about a stationary shaft 35. Between the latter and the pulley 13 there is, in the same way as described above, provided the friction means 18, 25 and 24.
  • the shaft 35 is secured in an inner bracket 36, which is pivoted around pins 37 and 38 within an outer, stationary bracket 39.
  • the pins 37 and 38 are eccentrically mounted in relation to the shaft 35 and are situatedslightly nearer the motor 9 than said shaft and substantially in a vertical plane passing through the shaft 35 andthe shaft of the motor 9. In reversing the direction of rotation of the motor the driving wheel unit will turn about the pins 37 and 38 to bring the driving wheel 14 into alternative engagement with the flanges and 6.
  • the pins 22 and 23 are then mounted directly on the bottom side of the driving wheel 14. 7
  • the former may be placed anywhere on the base plate.
  • the motor has only one pulley so that the belt tension will be constant at both speeds and the life of the belt longer.
  • a record player comprising a base plate, a shaft carried by said base plate, a turntable mounted on said shaft, a reversible electric driving motor carried by said base plate, a reversing switch for said motor, an outer circular flange and an inner coaxial circular flange drivingly connected with said turntable, a driving wheel driven by said motor and disposed between said outer and said inner flange and forming a driving unit with said motor and movable into engagement at its periphery with either the outer flange or the inner flange for causing rotation of the turntable always in the same direction of rotation but with different speeds by giving said motor and said driving wheel a first direction of rotation for cooperation with said outer flange when said switch in a first position and an opposite direction of rotation for cooperation with said inner flange when said switch in a second position, said driving wheel being mounted for rotation in a support means pivotable about a pivot axis spaced from the axis of rotation of said driving wheel, braking means rotating together with said driving wheel and frictionally cooper
  • said braking means comprise friction elements fast with said driving wheel and said means fast with said small gear include a friction disc coaxial with said driving wheel.
  • a record player as claimed in claim 1 and a driving belt driven by said motor and acting on a pulley fast with said driving wheel, said motor being positioned in relation to said support means to produce by the higher belt tension in the tensioned part of said belt a torque acting on said support means in the same direction as the torque produced by said braking means.

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  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US00291525A 1971-09-27 1972-09-25 Driving mechanism for the turntable in record players Expired - Lifetime US3833225A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE12154/71A SE353615B (de) 1971-09-27 1971-09-27

Publications (1)

Publication Number Publication Date
US3833225A true US3833225A (en) 1974-09-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00291525A Expired - Lifetime US3833225A (en) 1971-09-27 1972-09-25 Driving mechanism for the turntable in record players

Country Status (4)

Country Link
US (1) US3833225A (de)
DE (1) DE2246949C3 (de)
GB (1) GB1376670A (de)
SE (1) SE353615B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5463613A (en) * 1992-03-27 1995-10-31 Forsell; Peter Motor drive unit for a record player
US5561658A (en) * 1994-02-06 1996-10-01 Nakamichi Corporation Friction drive for a disc player

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0503809D0 (en) * 2005-02-24 2005-04-06 Khoubesserian Arthur Record player drive

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563649A (en) * 1948-10-13 1951-08-07 Gen Ind Co Two-speed friction drive transmission for phonograph turntables
GB766560A (en) * 1954-01-20 1957-01-23 Emi Ltd Improvements in or relating to sound recording or reproducing apparatus
FR1425761A (fr) * 1965-02-26 1966-01-24 Dispositif d'entraînement notamment pour plateau d'électrophone, magnétophone ou autre, ainsi que les appareils pourvus de ce dispositif d'entraînement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563649A (en) * 1948-10-13 1951-08-07 Gen Ind Co Two-speed friction drive transmission for phonograph turntables
GB766560A (en) * 1954-01-20 1957-01-23 Emi Ltd Improvements in or relating to sound recording or reproducing apparatus
FR1425761A (fr) * 1965-02-26 1966-01-24 Dispositif d'entraînement notamment pour plateau d'électrophone, magnétophone ou autre, ainsi que les appareils pourvus de ce dispositif d'entraînement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5463613A (en) * 1992-03-27 1995-10-31 Forsell; Peter Motor drive unit for a record player
US5561658A (en) * 1994-02-06 1996-10-01 Nakamichi Corporation Friction drive for a disc player

Also Published As

Publication number Publication date
SE353615B (de) 1973-02-05
DE2246949B2 (de) 1974-10-24
DE2246949C3 (de) 1975-06-12
DE2246949A1 (de) 1973-04-12
GB1376670A (en) 1974-12-11

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