Patent GB-283842-A (GB)
Title: Improvements in talking machines
IPC: G11B17/00
Filed: 1928-01-16
Abstract: 283,842. Victor Talking Machine Co., (Assignees of La Rue, W. D.). Jan. 15, 1927, [Convention date]. Magazine gramophones. -In a magazine gramophone the stock of records are supported at their central aperture on a rod supported at a small inclination to the horizontal and are transferred singly to the turntable by a rocking frame which also effects delivery of a record, after playing, by its return movement.. The transfer device is adapted to take from a stack of records of preselected size by initial manual adjustment of a setting dial to suit that size, and such setting adjusts automatically the movement of the tonearm,into starting position for playing the predetermined size of record. A single motor serves to drive the turntable and to actuate the transfer device, the latter being automatically brought into and out of operation. The magazine is supported on a pivoted arm adapted to turn down in a cabinet machine and allow the lid to be closed. Magazine feed : The records 50, Figs. 2 and 19, are threaded on a rod 48 over a, terminal lip. Fig. 48<a>, and a spring-pressed spider 46 which, during charging can be held retracted by the engagement with its sleeve 45 of a pin 53 on a spring clamp 52 is now released. The rod 48 is carried by an arm 42 pivoted to the machine casing to fold down with the turntable but held in operating position against springs 58 by a pivoted latch 57. The transfer device 59, Fig. 11, of hoop form is rocked about pivots 63 from a position surrounding the turntable 34 to bear against the stack of records, and if these are of the small size, say 10 inch, the front record is engaged by grippers 68 and a resilient hook 73, the grippers 68 in the final outward movement of the device 59 sliding the front record upwardly so that it is free of the lip 48<a> and can be carried away by the transfer device to the turntable whose conical spindle in engaging the hole in the record imparts a lateral movement to facilitate release from the grippers, the hook 73 being withdrawn by a pivoted lever 82, Fig. 2, linked thereto coming against a fixed plate 83 on the motor board. If the stack is composed of larger records, say 12 inch, the grippers 69 and hook 78 would operate, in which case the hook 73 would be depressed by the face of the record and the grippers 68 would be precluded from projecting through the transfer device 59 by the action of a setting dial. Manual adjustment of the, dial to one position acts through a bell-crank to slide a bar 95, Fig. 11, so that a cam 98 thereon rides under a pin 103 on a pivoted member 101 which is thus held against movement when the rocking transfer device 59 carries an arm 85 against it, and the arm 85 consequently rocks its spindle 84 to advance a wedge-shaped cam so as to retract the grippers 68, against lifting springs, until flush with the device 59. The bar 94 is normally locked in either set position by a. pivoted pawl 104 which is however disengaged by a projection 105, to permit resetting, when the device 59 is around the turntable. The transfer device is rocked through gearing from the motor-driven turntable spindle after a record has been played, the record then permitting a pivoted pawl 152, Figs. 5 and 9, on a loose disc 122 on the turntable-spindle to engage a fixed toothed wheel on the spindle whereby the disc is driven and a pinion 123 thereon drives a wheel 124 mounted in an arm 126 and carrying a wheel 128 driving a wheel 129 mounted in a guided plate 136 and carrying a crank pin 134a which acts with lost motion to reciprocate a bar 140 engaging a projection 143 on the transfer device 59 and also oscillates the arm 126 about the turntable spindle and reciprocates the plate 136 to control the movement of the tone arm. The device 59 is positively raised by the bar 140 and crank pins 134a and returns by gravity under the control of a spring 150 surrounding a rod 147 slidable in the bar and adapted to bear on a lug 151 on the arm 126. Delivery of played record : After playing, the record is carried by the returning transfer device 59, Fig. 2, until it can slide by gravity into a felt-lined receptacle 118 in the machine casing, the grippers 68, 69 being retracted to permit of this by a cam 116 acting on an arm 112, Fig. 11, to rock a spindle and advance a sliding cam over rods connecting the pivoted grippers. Tone-arm, raising, returning and positioning: The tone-arm 38, Fig. 9, carries a tube 165 extending down through a slotted plate 164 on the motor board, and a stem 163 slidable in the tube has a head 166 carrying a pivoted pawl 168 adapted to ride over teeth 192 on a lever 189 as the stylus tracks the record. The lever 189 is pivoted two a lever 181 capable of movement about horizontal pivots 180 and a vertical pivot 178 and adapted to ride along an inclined rib 194. When playing of a record is completed the record acts, as by an eccentric groove, to impart a small outward movement to the tone arm, causing the pawl 168 engaging the teeth 192 to rock the lever 189 so that its other arm permits the pawl 152 to engage its driving wheel 155 on the turntable spindle 33 to actuate the transfer device 59. The mechanism already described for actuating the transfer device reciprocates the plate 136, and a cam 139<a>, Fig. 5, thereon acts first to lift the lever 181 out of a notch 196 in the rib 194 and through the lever 189 and pawl 168 to lift the head 166 and stem 163, against the spring 169, so as to rock a pivoted lever 171 acting on the swan neck of the tone arm to raise the sound box 40, and then to rock the levers 181, 189 to return the sound box clear of the record. The cam 139a moves the lever through a friction ball 185 past which the cam slides when the tone arm is fully returned, and the lever comes against a stop 1.97 on the rib 194. The transfer device now operates as already described to deliver the played record and transfer another one to the turntable, and as the cam 139<a> returns it moves the levers 181, 189, and a spring-controlled lever 199 pivoted to the lever 181 engages the head 166 to carry the tone-arm inwards to starting position, which is controlled by a pin 200 depending in the path of the lever 199 and acting, after the tone-arm is correctly repositioned, to hold the lever clear of the head 166 whilst the levers 181, 189 are fully returned so as to disengage and fall into the notch 196, thus lowering the sound box on to the record and disengaging the cam 152 from its driving wheel. The pin 200 is connected through lever and links with the dial previously described for setting the transfer device to feed small or large size records from the magazine and is thus adjusted automatically to arrest the tone arm in correct starting machine for the size of record in the magazine.