Improvements in and relating to disc gramophone record players

摘要

1,007,277. Single record players; automatic speed selection. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. April 10, 1962 [April 13, 1961], No. 13764/62. Heading G5R. [Also in Division F2] A disc-record gramophone change-speed gear in which the speed selected is related to the centre-hole size of the record comprises a member 1 of a diameter corresponding to a largehole 45 r.p.m. disc and a centre-pin 4a of a diameter corresponding to a small-hole 33SP1/SP/3 r.p.m. disc, the member 1 being depressible by the weight of any small-holed disc placed about the pin 4a against the action of a spring 3, such that a circular abutment ring 2 is placed selectively to obstruct the path of either one of two identical levers 6, 7. The usual outward movement of the pick-up 13 to start the drive causes a lever 11 to be moved into a latched position, Fig. 2, whereupon a pin 11a acting in heart-shaped slots in the levers and previously holding both levers 6, 7 and their idlers 8, 9 in inoperative positions, allows one, 7 to swing under the action of a spring 19 but holds the other, 6, meantime inhibited in movement by the abutment 2 by engaging the cusp 6a. The idler 9 then transmits a 45 r.p.m. drive to the turntable rim from the larger of two steps 17 on the motor shaft. When a small-hole record lowers the abutment 2 (Fig. 3, not shown), the lever 6 engages the idler 8 with the smaller of the steps 17. Three ribs 1a are arranged to enter the clearances provided in certain breakout-centre type 45 r.p.m. records.