GB871921A - Improvements in devices for driving the turntable of phonographs, record players, etc., at a number of speeds - Google Patents

Improvements in devices for driving the turntable of phonographs, record players, etc., at a number of speeds

Info

Publication number
GB871921A
GB871921A GB24373/57A GB2437357A GB871921A GB 871921 A GB871921 A GB 871921A GB 24373/57 A GB24373/57 A GB 24373/57A GB 2437357 A GB2437357 A GB 2437357A GB 871921 A GB871921 A GB 871921A
Authority
GB
United Kingdom
Prior art keywords
lever
tenon
engages
cam
projection
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
GB24373/57A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB871921A publication Critical patent/GB871921A/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)

Abstract

871,921. Driving sound-reproducing machines. STAAR, M. Aug. 1, 1957 [March 22, 1957], No. 24373/57. Class 40 (2). A gramophone turn-table speed-changing device in which a friction wheel 3 transmits the drive from a stepped driving pulley 4 to the turn-table 1 is characterized by the provision of a position in which the friction wheel is disengaged from both the pulley and the turntable. The wheel 3 revolves on an axle carried by the lever 5 pivoted by the pin 19 to the arm 20. A tension spring 18 keeps the friction wheel 3 in contact with the turn-table 1 and the pulley 4. The arm 20 is raised and lowered on the pivot 11 by a tenon 24 which engages in a slot 23. The bell cam 9 is loosely mounted on a shaft 6 and is biased by a spring 33 to rotate in such a direction as to move the arm 20 down the pivot 11. The shaft 6 also carries a control lever 8 and a disc 28 which has a projection 29. Both these components are secured to the shaft which is biased by the spring 40 to rotate in the opposite direction to the bell cam 9. The pivot 11 also carries a lever 15 which has a tension spring 13 attached to the extension 12 and a further extension 31 which co-operates with the projection 29. The main part of the lever is bent over at 25 and 26 and carries a tenon 27 which engages the bell cam 9. Operation.-When the lever 8 is rotated in the direction opposite to the arrow F, Fig. 2, the projection 29 engages the tenon 24 and rotates the bell cam 9, thus raising the arm 20 and engaging a lower speed. The tenon 27 engages the teeth 10 of the cam and overcomes the effect of the spring 33. On rotation of the lever 8 in the direction of the arrow F, the projection 29 leaves the tenon 24 and engages the extension 31, moving the tenon 27 out of engagement with the teeth 10 of the cam 9 and allowing the cam to rotate in the same direction as the lever. At the same time the part 25 of the lever 15 engages the lever 20 and rotates it about the pin 11, so that the wheel 3 moves out of engagement with the turn-table 1 and the pulley 4.
GB24373/57A 1957-03-22 1957-08-01 Improvements in devices for driving the turntable of phonographs, record players, etc., at a number of speeds Expired GB871921A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE871921X 1957-03-22

Publications (1)

Publication Number Publication Date
GB871921A true GB871921A (en) 1961-07-05

Family

ID=3883064

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24373/57A Expired GB871921A (en) 1957-03-22 1957-08-01 Improvements in devices for driving the turntable of phonographs, record players, etc., at a number of speeds

Country Status (1)

Country Link
GB (1) GB871921A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346260A (en) * 1964-11-13 1967-10-10 Warwick Electronics Inc Speed change mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346260A (en) * 1964-11-13 1967-10-10 Warwick Electronics Inc Speed change mechanism

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