GB820379A - Improvements in or relating to gramophone speed-changing devices - Google Patents

Improvements in or relating to gramophone speed-changing devices

Info

Publication number
GB820379A
GB820379A GB2425656A GB2425656A GB820379A GB 820379 A GB820379 A GB 820379A GB 2425656 A GB2425656 A GB 2425656A GB 2425656 A GB2425656 A GB 2425656A GB 820379 A GB820379 A GB 820379A
Authority
GB
United Kingdom
Prior art keywords
idler wheel
lever
stepped pulley
gramophone
aug
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
GB2425656A
Inventor
James Alexander Lee
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.)
Plessey Co Ltd
Original Assignee
Plessey Co 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB2425656A priority Critical patent/GB820379A/en
Publication of GB820379A publication Critical patent/GB820379A/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

  • Transmission Devices (AREA)
  • Mechanical Control Devices (AREA)

Abstract

820,379. Variable speed gear. PLESSEY CO. Ltd. Aug. 8, 1957 [Aug. 8, 1956], No. 24256/56. Class 80 (2). [Also in Group XXXVIII] An automatic gramophone of the centrespindle magazine type in which the motorspindle carries a stepped pulley e, f, g, and the drive is transmitted to the inside rim h of the turntable i by an idler wheel a, is characterized by the use of a single lever k to move the idler wheel a both axially and laterally relative to the stepped pulley e, f, g. The idler wheel a is supported by an arm b which is free to pivot and to move axially on the pin c. The lever k is supported at t in the fulcrum slot s of the bracket q and is free to rotate in both horizontal and vertical planes, it has a slot I in one end to engage an opening in the lever b and at the other end are two pins p<SP>1</SP> and m<SP>1</SP> which co-operate with a peripheral cam surface and an axial cam surface respectively of the cam block M. A shallow groove W is provided to resiliently hold the control knob N in a position in which the idler wheel is disengaged from the stepped pulley.
GB2425656A 1956-08-08 1956-08-08 Improvements in or relating to gramophone speed-changing devices Expired GB820379A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2425656A GB820379A (en) 1956-08-08 1956-08-08 Improvements in or relating to gramophone speed-changing devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2425656A GB820379A (en) 1956-08-08 1956-08-08 Improvements in or relating to gramophone speed-changing devices

Publications (1)

Publication Number Publication Date
GB820379A true GB820379A (en) 1959-09-16

Family

ID=10208875

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2425656A Expired GB820379A (en) 1956-08-08 1956-08-08 Improvements in or relating to gramophone speed-changing devices

Country Status (1)

Country Link
GB (1) GB820379A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991660A (en) * 1960-04-20 1961-07-11 Cons Electronics Ind Phonograph drive
US3138031A (en) * 1960-02-23 1964-06-23 Lesa Costruzioni Elettromeccan Speed changing mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3138031A (en) * 1960-02-23 1964-06-23 Lesa Costruzioni Elettromeccan Speed changing mechanism
US2991660A (en) * 1960-04-20 1961-07-11 Cons Electronics Ind Phonograph drive

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