GB693764A - Improvements relating to change speed turntable drives for talking machines using disc records - Google Patents

Improvements relating to change speed turntable drives for talking machines using disc records

Info

Publication number
GB693764A
GB693764A GB1621550A GB1621550A GB693764A GB 693764 A GB693764 A GB 693764A GB 1621550 A GB1621550 A GB 1621550A GB 1621550 A GB1621550 A GB 1621550A GB 693764 A GB693764 A GB 693764A
Authority
GB
United Kingdom
Prior art keywords
stepped
friction
friction wheel
idler
spindle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1621550A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LAWRENCE VINCENT GUEST
Birmingham Sound Reproducers Ltd
Original Assignee
LAWRENCE VINCENT GUEST
Birmingham Sound Reproducers Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LAWRENCE VINCENT GUEST, Birmingham Sound Reproducers Ltd filed Critical LAWRENCE VINCENT GUEST
Priority to GB1621550A priority Critical patent/GB693764A/en
Publication of GB693764A publication Critical patent/GB693764A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G11B19/265—Friction wheel drive

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Friction Gearing (AREA)

Abstract

693,764. Change-speed friction gearing. GUEST, L. V.. SHEPHARD, P., and BIRMINGHAM SOUND REPRODUCERS, Ltd. June 8, 1951 [June 28, 1950], No. 16215/50. Class 80 (ii). Change-speed friction gearing for gramophones, of the kind including a stepped friction wheel 9 adapted to be driven by the motor 3 of the machine and a rubber-tyred friction idler disc 13 adapted to engage between the stepped friction wheel and a circumferential surface 6 on the turntable, the stepped friction wheel and the friction idler disc being disposed for relative axial movement, is characterized by cams or projections 33, 34 being provided between adjacent portions 10, 11, 12 of the stepped wheel, to facilitate the passage of the idler from its smaller to its larger diameter portions, and by either the stepped friction wheel or the friction idler disc being biased in the axial direction to engage the idler disc with the larger diameter portion of the stepped friction wheel. As shown, the friction idler disc 13 is mounted for rotation on a pin 18 movable in a slot along an arm 16, and is urged to engage the stepped friction wheel &c. by a spring 21. The arm 16 is attached to a spindle 14, rotatable and axially movable in a sleeve 15, which is biased downwardly both by gravity and by a spring 30, so that the idler tends to engage with the portion 12 of the stepped wheel. The velocity ratio is changed by moving the spindle 14 vertically, this being effected by a lever 25, pivoted in a support 24, engaging the spindle 14 at one end and being engaged at its other end by a cam 26 on a rotatable spindle 27 turned by means of a knob 28. The cam 26 has three flat portions corresponding to the three ratios of the change speed gear, and is retained in one of the positions corresponding to a particular velocity ratio by a leaf spring 29. In a modification, Figs. 13, 14 (not shown), the stepped friction wheel 9, instead of being mounted directly on the motor spindle, is freely rotatable on a separate pin and has a rubber-tyred portion constantly engaging a cylindrical friction wheel on the motor spindle. In another modification, the idler is held against vertical motion, the stepped friction wheel 9 being splined to the motor shaft and itself moved vertically to produce a change of speed.
GB1621550A 1950-06-28 1950-06-28 Improvements relating to change speed turntable drives for talking machines using disc records Expired GB693764A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1621550A GB693764A (en) 1950-06-28 1950-06-28 Improvements relating to change speed turntable drives for talking machines using disc records

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1621550A GB693764A (en) 1950-06-28 1950-06-28 Improvements relating to change speed turntable drives for talking machines using disc records

Publications (1)

Publication Number Publication Date
GB693764A true GB693764A (en) 1953-07-08

Family

ID=10073260

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1621550A Expired GB693764A (en) 1950-06-28 1950-06-28 Improvements relating to change speed turntable drives for talking machines using disc records

Country Status (1)

Country Link
GB (1) GB693764A (en)

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