Patent GB-312222-A (GB)
Title: Improvements in talking machines of the magazine player type
IPC: G11B17/00
Filed: 1929-03-08
Abstract: 312,222. Continuous Gramophones, Ltd., (Assignees of Oyston, W. R.). May 22, 1928, [Convention date]. Magazine gramophones.-Relates to magazine gramophones, wherein vertically arranged disc records are transferred singly from a transversely movable magazine to a vertical turntable and are returned to the magazine after being played. According to the invention, in order that both sides of each record may be automatically played in turn, means are provided whereby after one side of a record has been played and the record has been returned to the magazine, a half-revolution is imparted to the magazine; after the second side has been played, and the disc again returned to the magazine, the latter is given a transverse movement combined with another semi-revolution, so so that the next record is brought into position for transfer to the turntable. The invention is described as embodied in a machine of the kind described in Specification 304,070, having a record-transferring arm 30 carried by a member 31 which is integral with a shaft 32. The magazine comprises vertical partitions 10, Fig. 1, between which the records 14 rest on inclined bottom plates, the magazine being detachably mounted upon a platform 15. This rests on adjustable screws 17 carried by arms 18 of a fourarmed support 27, which is adapted to be rotated, through a sleeve 27a, by a spring mctor 28. The ends of the arms 19 of the support are forked to guide a rack 20 attached to the underside of the platform 15, the teeth of the rack engaging with a snail or cam 22 projecting from a fixed plate 23. One portion of the cam 22 is concentric with the axis of rotation of the member 27, while the remaining portion is eccentric thereto. Rotation of the support 27, together with the magazine, is normally prevented by the engagement of one or other of two blades 42 on the arms 18 with an escapement device 29, comprising a member 38, fixed on a spindle 37 and having pivoted thereon at 40 a spring tooth 41a, adjacent to a fixed tooth 29a, Fig. 7. The spindle 37 is connected by a crank 36 and rod 35 with a crank 33 on, the shaft 32. Movements of the rod 35 are controlled by a spring 50 and a bellows 43 connected to the rod. The operation of the mechanism is as follows. When the member 31 swings to the right (Fig. 1), a record is transferred from the magazine to the turntable 60, and the partial rotation of the shaft 32 that occurs acts through the members 33, 35, and 36 to cause a partial rotation of the spindle 37. This shifts the spring tooth 41a laterally away from the blade 42, which then bears against the tooth 29a, whilst the tooth 41a is moved by its spring so as to leave, a gap between its upper end and the inner face of the member 38. At the same time, the bellows 43 is deflated. On the return of the record after playing, to the magazine, the reverse rotation of the shaft 32 causes the spindle 37 to move the escapement device 29 back to its original position, whereupon the member 42 escapes past the tooth 29a, and the magazine support 27, with the parts carried thereby, rotates through 180‹ until it is stopped by the blade 42 on the other arm 18. Means for absorbing the shock of impact are provided. The bellows device 43 delays the, return movement of the rod 35, and consequently the release of the blade 42, until the return of the record to the magazine has been completed. When a record has been played on both sides, and is returned to the magazine a second time, the half revolution of the magazine which then occurs is accompanied by a transverse movement, due to the engagement of the rack 20 with the eccentric portion of the cam 22. This movement brings the next record of the series into position for transfer to the turntable. The sequence of operations is then repeated until both sides of the last record have been played. By this time the rack 20 has advanced to such a position that when its final half-revolution occurs it strikes the end of a slidable horizontal bar 53. The latter is adapted to actuate a switch 56 controlling the motor circuit of the machine, so that when the bar is moved by the rack 20 the motor is stopped. To restore the magazine to its original position, the platform 15 is raised slightly by means of handles 57 and is moved transversely, being replaced with the first notch of the rack in engagement with the appropriate portion of the cam 22.