Patent GB-416131-A (GB)
Title: Sound reproducing apparatus comprising a device for turning over and exchanging the records
IPC: G11B17/02
Filed: 1933-04-26
Abstract: 416,131. Magazine gramophones. FELLINGA, G., 20, Argonautenstraat, Amsterdam. April 26, 1933, No. 12224. [Class 40 (ii).] Relates to magazine gramophones comprising means for turning over the records so that both sides of each record are played in turn before it is returned to the magazine. According to the invention, the mechanism comprises a device for removing a record from the turntable after one side has been played and depositing the record in reversed position on guides located near to the turntable, means for pushing the record back into position for reception again by the turntable, and means for swinging the magazine so that when the record is lifted after the second side has been played it is received into one end of the magazine, whilst a fresh record is released from the other end and is moved into position for playing. Figs. 1 and 2 show the machine in elevation and plan respectively, and Fig. 3 is a view from underneath, of the mechanism below the supporting platform. The machine comprises a turntable 2, driven by a motor 4, and mounted on a spindle 3 which is adapted to rise and fall. Recordlifting arms 45, lying on either side of the turntable, are mounted on a spindle 40. Guides 50, 51 are arranged at one side of the turntable as shown, and between them is another pair of arms 52 which co-operate in record changing. The arms 45 and the guides 50, 51 are stepped in cross-section, so as to accommodate either a large or small record. The magazine is an open-ended cylinder 29 carried by an arm 30, which is pivoted on a vertical spindle 28. A separate motor 21 drives through a belt and pulley and worm-gearing a shaft 9 from which the record reversing and changing and the tone-arm returning mechanism are actuated. The operation of the machine is as follows. During the playing of a record, the magazine 29 occupies the position shown in plan in Fig. 2. The records lie in a slightly inclined position in the magazine, the rearmost leaning against an inner flange (not shown) and a segmental plate 32, Fig. 1. The turntable is held up in the playing position by engagement of its spindle with one end of a lever 5, the other end of which bears against a pin 7 on a worm wheel 8 on the shaft 9. When the playing of one side of a record is finished, the circuit of the motor 21 is completed at contacts 94<1> through the attraction of a lever 94 by a magnet 96 which is energized on the closure of a tone-arm operated switch. The motor 21 drives the shaft 9, and the pin 7 is thereby moved so as to release the lever 5, the turntable being thereby lowered and the record left on the arms 45. A crank 33 on the shaft 9 at the same time rocks a lever 38 through an interconnected dashpot 35, the lever 38 rotating the spindle 40 with the arms 45. These raise the record into the dotted-line position shown in Fig. 1, depositing it on two rubber blocks 91, Fig. 2. The lever 38, through intermediate links 60, 59, also rotates the shaft 56 on which the arms 52 are mounted, swinging these arms upwards, so that when the record is tilted over, on the blocks 91 as pivots, it is received by the arms 52. They subsequently lower the record on to the guides 50, 51. Meanwhile, bevel gearing connecting the shaft 9 with a vertical shaft 24, Fig. 3, has rotated an arcuate member 25 so that a pin 83 thereon rotates a lever 89 connected to the tone-arm support, and the tone-arm is thus swung outwardly until the pick-up 90 rests on a spring-controlled support 124. By the time the record has been placed on the guides 50, 51, a pin 82 on the member 25 has engaged a lever 81, rotating it and thereby causing a slide 66 to push the record along until it lies over the turntable. In its movement, the record engages the member 124 and so locates the pick-up in the starting position appropriate to the size of the record. The turntable is then raised by the action of the pin 7 on the lever 5, bringing the reversed record into contact with the needle, so that the playing of the second side of the record begins, the motor 21 being stopped at the same time. This stoppage is effected by the opening of the switch 94<1> and application of a brake 97 which occur when the end 95 of the lever 94 drops into a recess in a disc 111 on the shaft 9. During the single revolution of the shaft 9 that has occurred, the shaft 24 has made half a revolution only, and with it the arcuate member 25. Consequently, when the motor 21 is again started, on completion of the playing of the second side of the record, a roller 26 on a spring- actuated arm 27 fixed to the spindle 28 of the magazine, Fig. 3, is released by the cam 25, and the spindle 28 rotates, swinging the magazine through a right angle into the position shown in Fig. 1. Movement of the turntable and of the arms 45, 52 then occurs as before, but the arms 45 lift the played record along guides 99 towards the front of the magazine. A plate 48 arranged between and moving with the arms 45 operates a bell-crank lever (not shown) on the magazine, and a slide at the rear end of the magazine is thereby caused to eject a fresh record. This passes through the back of the magazine and is received by the arms 52, being afterwards pushed towards the turntable by the slide 66. The magazine is returned to its normal position by the action of the member 25 on the arm 27, and in this movement the played record is pushed from the guides 99 into the magazine by engagement with a spring-controlled lever 108. When the turntable has again been raised and the motor 21 stopped, the whole cycle of operations begins again.