Patent GB-360110-A (GB)
Title: Improvements in automatic multiple record gramophones
IPC: G11B17/02
Filed: 1930-09-08
Abstract: 360,110. Automatic gramophones. DEHN, F. B., 103, Kingsway, London.- (Mills Novelty Co. ; 4100, Fullerton Avenue, Chicago, U.S.A.) Sept. 8, 1930, No. 26811. [Class 40 (ii).] An automatic gramophone is provided with electric switch means which are actuated by the tone-arm, either by a continued inward movement or by a reverse movement, at the end of playing of a record to operate means for bringing another record into playing position. The arrangement is shown applied to the gramophone described in Specification 357,99.8, wherein records 18, Fig. 1, on turntables 17 mounted on radial supports. 10 extending from a shaft 12 are successively brought into position to be played by a pick-up 32 on an arm 31 mounted by pivots 34, 36 on an arm 28 capable of rocking on a pivot 29 on an upright 30, and wherein the turntable supporting the record in playing position is peripherally driven by a bevel pinion 25 driven by a motor 24 in a pivoted frame carrying a roll 45 bearing against a lever 41 which is pivoted at 42 to support 43 and has a hook 42a engaging the arm 28 supporting the pick-up and a bowl 44 engaging a peripheral cam 38 secured to the radial supports 10. The switch means comprises a plate 53, Fig. 4, of insulating material supported from the upright 30 and carrying three pivoted levers 51, 54, 55, the outer levers 54, 55 being drawn towards one another by a spring 62 so that stops 63, 64 bear against the plate. The central lever 51 is normally held centrally between the outer levers by a spring 65 and carries a ratchet rack 70 along which rides a pivoted pawl 74 carried by an arm 72 extending from the pick-up arm during playing of a record. If the record terminates in an inward spiral the pawl 74 pushes the lug 79 on the rack and rocks the lever 51 to close contacts 58, 60, but if the record terminates in an eccentric groove the pawl is given a reverse movement and engages the rack to rock the lever 51 so that contacts 59, 61 are closed. In either case a circuit is completed to the motor 20 by the connections shown in Fig. 3, whereby the shaft 12 is driven by the chain 22 so that the supports 10 and cam 38 are moved, a groove 40 of the cam then acting on the bowl 44 to rock the lever 41 which through bowl 45 rocks the motor 24 so that the driving pinion 25 is clear of the turntable 17, and through the hook 42a and stud 43 rock the arm 28 to lift the pick-up. In this movement, the pick-up moves automatically against the arm 28 to its outer starting position, and the movement of the lever 41 has allowed a spring-controlled switch lever 81 to close contacts 84, 85 in a shunt circuit across the switch levers 51, 54, 55, Fig. 3, so that the circuit to the motor 20 remains closed although the circuit through the lever 51 is broken when the pick-up arm, and with it the arm 72 and pawl 74, is raised. When the next record arrives in playing position another groove in the cam 38 permits the lever 41 to rock so that the motor 24 can drive the new record and the pick-up is lowered, the switch 81 being also rocked to break the circuit to the motor 20.