Patent GB-364571-A (GB)
Title: Improvements in or relating to magazine gramophones
IPC: G11B17/16
Filed: 1930-10-04
Abstract: 364,571. Magazine gramophones. ALLEN, D. T., 179, Circle, Milwaukee, Wisconsin, U.S.A. Oct. 4, 1930, No. 29750. Convention date, April 3. [Class 40 (ii).] Relates to magazine gramophones of the type wherein a plurality of records, adapted to be fed in succession to a turntable, is supported above the turntable in a slanting position on a member 16, Fig. 1, terminating in a part 57 axially aligned with the turntable spindle 29. According to the invention a cam 18, Fig. 6, driven continuously from the turntable motor, is adapted to lift the pick-up arm 14 and move it outwardly under the action of a cam follower 19 which is mounted on a lever 21 adapted to actuate an arm to release the lowermost record from the supporting member 16 when the pick-up arm 14 has reached its outermost position. The member 21, which is pivoted at 37 below the baseplate 11, is provided with a part 38 projecting upwardly through the baseplate, so that co-action of the cam 18 and follower 19 causes a table member 39, Fig. 1, on the upper end of the member 38 to lift the pick-up arm 14. The table member 39, which engages a rounded projection 40 on a member 42 secured to the pick-up arm, is tilted by the cam 18 so as to cause the pick-up arm to slide until a portion 43 of the member 42 engages a post 44<1>. Two arms 50, provided on a shaft 22, Fig. 4, extend upwardly through openings 51 in the baseplate and are connected at their upper ends by a plate 52 having a projection 53 and an adjustably-mounted plate 54. Normally the arms 50 engage the outer edges of the openings 51 and the extension 53 co-operates with an abutment 56 on the member 16 to support a stack of records. A screw 45, Fig. 6, carried by an extension of the lever 21, is caused by the cam 18 to engage a flexible projection 47 on the shaft 22 whereby the arms 50 are moved so that the plate 54 engages the periphery of the lowermost record on the stack and lifts it from the abutment 56. The record then slides down the lower end 57 of the carrier 16. The arms 50 may be replaced by a single arm, and the plate 54 may be constituted by a shoulder on the enlarged end of the arm. The stylus is guided into its correct initial position after a record has been deposited on the turntable by the co-operative action of an inclined surface 43 on the member 42 with the post 441 as the table member 39 recedes to horizontal position. The cam follower 19 is mounted at the end of a rod 33 freely slidable in aligned apertures in the member 21 and an arm 34 carried by the member 21. At the completion of playing a record, automatic mechanism arranged within a casing 58 constituting a support for the pick-up arm 14, is caused to actuate an arm 20 which engages the end of the rod 33 and moves it so that the member 19 engages the edge of the cam 18. The arm 20 is connected at its upper end to an insulating block 80 on a member 65, Fig. 5, which is pivoted at 68 on a baseplate 60 in the casing 58 and is provided with a recess 66 adapted to co-operate under the action of a spring 69 with a lug 64 on a lever 63. When the pick-up arm 14 reaches the end of a record, the casing 58 will have revolved to such a position as to cause a stop 72 on the casing to engage a lever 73 and thereby move the lever 63, through the medium of a lever 75, so as to release the member 65 for movement by the spring 69. The member 20 is thereby moved so as to cause the cam 18 to become operative. As the pick-up arm moves outwardly, a pin 87 on the casing 58 is adapted to re-set the member 65. A switch contact 81 on the member 65 normally engages a stationary contact 84, such contacts being in circuit with the turntable motor and adapted to be separated when the member 65 is released. The turntable motor will not however be stopped unless there are no more records on the carrier 16 since the switch contacts 81, 84 are in shunt with a second switch which is controlled by the carrier 16. The record carrier 16, which is of U-shape, is pivotally mounted in a housing 96 beneath the baseplate 11. The record carrier 16 is urged in counterclockwise direction by a spring 100, Fig. 7, against the action of another spring 97 projecting through the side of the housing 96, and is provided with a switch contact 104 co-operating with a stationary contact 103 to constitute the second switch referred to above. The spring 100 is so adjusted that the carrier 16 cannot move to open the switch 103, 104 until there is no record on the carrier.