Patent GB-469471-A (GB)
Title: Improvements in magazine gramophones
IPC: G11B17/16
Filed: 1935-10-26
Abstract: 469,471. Magazine gramophones. WILKINSON, R. Oct. 26, 1935, No. 26597. [Class 40 (ii)] An arrangement for the automatic playing of gramophone records in sequence, including a magazine, a record carrier to traverse records to and from said magazine and a gramophone turntable, is provided with three operative rotatable cranks; mounted on independent shafts and disposed in one and the same plane, one of these cranks being coupled permanently to the main driving shaft for the automatic displacement of the tone arm and other operations common to each variable operation of the machine, whilst either of the other two cranks can be coupled at any one time at will to said driving shaft by clutches, one of these cranks operating the side-for-side reversal of the record whilst the other operates the displacement of the record carrier and the consequent necessary stepby-step displacement of the magazine. As shown in Fig. 2, the main driving shaft 28 carries at its upper end a bevel wheel 27 meshing with a bevel wheel 26 carrying a pinion 25 in constant driving connection with gear wheels 24 and 142. The wheel 24 is also in constant mesh with a pinion 69 which carries a crank arm 94 adapted to operate the means for returning the tone arm to its starting position and for lowering the needle into engagement with a record. A gear wheel 23 carrying a crank arm 22 and meshing with a pinion 60 is adapted to be clutched to gear wheel 24 for effecting the transfer of a record between the magazine and turntable and a step-by-step displacement of the magazine whilst a crank arm 140 is adapted to be clutched to the gear wheel 142 for effecting the sidefor-side reversal of a record. Transferring record between magazine and turntable. The records 3 are carried on pairs of fingers 32, 33 in a magazine 2, Fig. 5, the fingers being carried rigidly on spindles 34, 35 mounted in upper and lower frame members 450, 451 which are displaceable on vertical guides 36, 37 carried by brackets 38, 39 on the main frame 1. A rack bar 40 on the magazine is in mesh with a pinion 41 on a countershaft 42 provided with ratchet wheels 43, 44, the former serving for the step-by-step raising and the latter for the step-by-step owering of the magazine. Spindles 52, 53 are disposed vertically between the fingers 32, 33, the former spindle serving to index the records in the magazine prior to the playing thereof and the latter indexing the records returned to the magazine after playing. A record is transferred between the magazine and turntable by means 'of a carrier 4, Figs. 4 and 5, mounted on. a guide 5 sliding on runways 6, 7 and connected by a link 9 and crank arm 10 to a sleeve 11 carried in bearings in the frame 1 and connected by further linkage with the crank arm 22. An extension arm 29 on the carrier 4 is provided with pins 30, 31 adapted to co-operate with the spindles 52, 53 when a record is being withdrawn from or returned to the magazine by the carrier. When a record on the pin 31 of the carrier is positioned over the turntable, it is received by vertically displaceable lifter plates which subsequently drop to deposit the record on the turntable. On completion of the playing of a record, these plates are raised to lift the record which is temporarily indexed on a pin on the end of an arm 163, Fig. 4, prior to being aeposited on the pin 30 of the carrier. Side-for-side reversal of record. When it is desired to reverse a record, it is gripped between the outer ends of a pair of arms 72, 73, Fig. 4, slidable on a common guide 79 carried by a bush 129 rotatably mounted in a bracket 130, Fig. 2. This bracket is adapted to be raised and lowered on vertical guides 131 by means of linkage connecting it with the crank arm 140 which is also connected by a link 143 to a rocking segment 144 pivoted at 145 to the frame 1 and provided with teeth 146 and notches 147 adapted to engage with projections 148 on a star-wheel 149 on the bush 129, when this is at the top of the guides 131, so as to rotate the bush through 180‹ thus reversing the record side-for-side. Returning tone-arm to starting position and lowering same on to record. When the stylus enters the run-off groove at the completion of the playing of a record, contacts are closed to complete the motor circuit, preferably by an arrangement as described in Specification 468,137 whereupon pinion 69 and crank arm 94 are set in rotation. A face cam 240, rigid with the arm 94, then acts on one end of a pivoted lever 237, which is connected through linkage to one end of a pivoted lever 227, so as to depress the other end 226, Fig. 7, of this lever. The end 226 of the lever engages a double flanged collar 225 which is also engaged by one end of a pivoted lever 224 the other end of which engages a slide 222 moving in pin-and-slot guides on a bracket 223 and abutting against the lower surface of the tone-arm 200. Depression of the end 226 of the lever 227 therefore acts to raise the tone-arm about its horizontal pivot 202 whereupon the tone-arm is moved outwardly and deposited on a carrier 204. When the next record is to be played, the tone-arm and its carrier are moved inwardly until a stop pad or roller 221 contacts with the edge of the record whereupon the tone-arm is released from its carrier and gradually lowered on to the record. A spring finger 269 on the carrier 204 is adapted to give an initial radial thrust to the tone-arm. The machine may be stopped automatically when any desired number of records have been played by inserting a peg 557, Fig. 5, in an appropriate hole in a rod 551, a projection 550 on the magazine coming into contact with the peg 557 when the magazine has been moved upwardly through the predetermined distance. Further upward movement of the magazine then raises the rod 551 whereby levers 558 and 560 are turned so as to move a control knob 408 from the automatic playing to the neutral position.