Patent GB-382276-A (GB)
Title: Improvements relating to gramophones and the like
IPC: G11B17/16
Filed: 1931-07-16
Abstract: 382,276. Magazine gramophones. PALMER, J. D., Old Curiosity Shop, Market Square, Highworth, Wiltshire. July 16, 1931, Nos. 20459 and 21662. [Class 40 (ii).] Comprises means for changing automatically the record of a gramophone, wherein two cams adapted to rock the tone-arm in opposite directions are mounted upon a shaft which also carries two other cams the one to raise and lower the tone-arm and the other to actuate the record-supporting means to release the unplayed records one at a time on to the turntable. As shown, Figs. 1 and 2, a sound reproducer 10 is hinged to an arm 12 carried by a member 13 which is supported by, and is capable of rotary movement on, a casing 14 through which extends a shaft 15. Mounted upon the shaft. 15 are two similar discs 16, 17 each formed with a cam groove engaged by pins 19, 39, respectively. The pin 19 is mounted on a slide-bar 20 which extends through apertures in opposite sides of the casing 14 and is furnished with an arcuate extension 21. To the arm 12 is pivoted at 24 a lever, one end 22 of which contacts with the reproducer 10 while its other end 23 is in contact with the arcuate extension 21. The unplayed records are supported on a rod 31 by a bracket 32 and one of a pair of fingers 35, 36. The fingers 35, 36 project from a shaft 34 carried by a pillar 30 and are spaced apart angularly, while they are spaced vertically a distance equal to the thickness of a record. An arm 37 projects from the shaft 34 and is connected to a slide-bar 38 with which engages the pin 39. On opposite sides of the casing 14 the shaft 15 carries arms 40, 41 adapted to engage with projections 42, 43, respectively, on the member 13. The shaft 15 is rotated through the medium of a worm wheel 44, worm 45 and clutch members 46, 47, Fig. 3, from a shaft 48 driven from the turntable spindle 27. The operation of the clutch 46, 47 is controlled by the engagement of a fork 53 with a groove in the member 47, the fork 53 being carried by a block 54 which is slidable and rotatable upon a pillar 55 under the influence of a spring 56. The block 54 carries an arm 57, lying in the path of the reproducer arm 12, and a detent 58 adapted to be engaged by a pin 59 on the shaft 15. During playing of a record, the detent 58 lies beneath and in engagement with the pin 59 so that the clutch members 46, 47 are disengaged. When the stylus 11 reaches the end of a record, the arm 12 engages with and rocks the arm 57 against the action of the spring 56, thus releasing the detent 58 from the pin 59 and allowing the clutch members 46, 47 to engage to cause rotation of the shaft 15. Thereupon the bar 20 is slidden towards the turntable, thus tilting the lever 22 and lifting the stylus from the record. The projection 43 is then engaged bv the arm 41 to swing the reproducer clear of the record, and movement of the bar 38 causes rotation of the shaft 34 so that the finger 36 moves away from beneath the lowest unplayed record to allow it to fall on the turntable while the finger 35 enters between the bottom record and the one next above it. Engagement of the arm 40 with the projection 42 causes the cam 12 to be swung back, to position the stylus at the beginning of the next record and when the bars 20, 38 respectively are returned to the original positions the stylus is lowered on to the record and the fingers 35, 36 are returned to their original positions beneath the remaining unplayed records.