GB698865A - Improvements in or relating to gramophone record playing apparatus - Google Patents

Improvements in or relating to gramophone record playing apparatus

Info

Publication number
GB698865A
GB698865A GB530449A GB530449A GB698865A GB 698865 A GB698865 A GB 698865A GB 530449 A GB530449 A GB 530449A GB 530449 A GB530449 A GB 530449A GB 698865 A GB698865 A GB 698865A
Authority
GB
United Kingdom
Prior art keywords
pick
speed
jockey pulley
bar
shaft
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
GB530449A
Inventor
Clifford Metcalfe
Derrick Twivey
Kenneth Frederick Hopkins
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB530449A priority Critical patent/GB698865A/en
Publication of GB698865A publication Critical patent/GB698865A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00Driving, 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
    • G11B19/20Driving; Starting; Stopping; Control thereof
    • G11B19/26Speed-changing arrangements; Reversing arrangements; Drive-transfer means therefor
    • G11B19/265Friction wheel drive

Landscapes

  • Moving Of Heads (AREA)

Abstract

698,865. Driving sound reproducing machines. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Feb. 17, 1950 [Feb. 26, 1949], No. 5304/49. Class 40 (ii). In a sound reproducing machine having different transducers for records driven at different speeds, one of said transducers is coupled to the speedchanging means so that when said transducer is in a position to co-operate with the record said speed-changing means is set for driving the record at the appropriate speed. In the embodiment described, a gramophone pick-up 1 intended to play the slower speed records is provided with a rest 11 having a forked lever 12 thereon which is coupled to a sliding bar 13 which is moved to the right, Figs. 1 and 2, when the pick-up is moved to the operative position, the said bar 13 switching the pick-up 1 into connection with an amplifier by means of a switch 31 and effecting the change of speed of the turntable by moving the jockey pulley 9 into engagement with the smaller diameter part 8 of the motor shaft 7. The latter movement is effected by a ramp 26 cooperating with the shaft 22 of the jockey pulley 9 and by the inclined surfaces of a projection 20 on the bar 13 which serve to move the jockey pulley 9 to an inoperative position during the up or down movement of the shaft 22. Another embodiment is described, Fig. 3, in which two pick-ups are combined in a single head 33 mounted on the end of the same arm, the change-over of speeds being effected by the rotation of the head 33, gearwheels 35, 36, and a control rod 39. Specification 698,919 is referred to.
GB530449A 1949-02-26 1949-02-26 Improvements in or relating to gramophone record playing apparatus Expired GB698865A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB530449A GB698865A (en) 1949-02-26 1949-02-26 Improvements in or relating to gramophone record playing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB530449A GB698865A (en) 1949-02-26 1949-02-26 Improvements in or relating to gramophone record playing apparatus

Publications (1)

Publication Number Publication Date
GB698865A true GB698865A (en) 1953-10-28

Family

ID=9793574

Family Applications (1)

Application Number Title Priority Date Filing Date
GB530449A Expired GB698865A (en) 1949-02-26 1949-02-26 Improvements in or relating to gramophone record playing apparatus

Country Status (1)

Country Link
GB (1) GB698865A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3481608A (en) * 1954-01-15 1969-12-02 James T Dennis Record changer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3481608A (en) * 1954-01-15 1969-12-02 James T Dennis Record changer

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