Patent GB-330645-A (GB)
Title: Improvements in talking machines
IPC: G11B17/00
Filed: 1929-03-16
Abstract: 330,645. Gramophone Co., Ltd., Thompsett, H. A., and Chiffey, E. March 16, 1929. Magazine gramophones.-In a disc machine having means for turning the record over so that both sides thereof may be played. the reversing rotation of the record is effected while it is making a vertical movement. As applied to a magazine gramophone, the reversing mechanism is operated by cams on a shaft 17, Fig. 1, which is geared to the turntable spindle 4 each time the playing of a record is complated, as described in Specification 317,358. The diameter of the turntable 5 is less than that of the smallest record to be played. A pair of record-engaging arms 25, 26, each having upper and lower parts secured together by links 28, are pivoted at 23, 24 to a member 19 rotatably carried in a member 34 fixed on a. vertical pillar 35. A block 37 slidablei on a pin 36 has a central aperture 43 and side grooves 42, the lower end of the aperture 43 being engaged by an end of a pivoted lever 45 connected to a, cam-operated link 47, and the grooves 42 having pins 44 secured to the arms 25, 26. Movement of the link 47 thus moves the arms 25, 26 from the full line into the dotted line position of Fig. 1. Each part of the arms 25, 26 is of trough formation, having a record-engaging member 48 pressed towards the trough base by a spring 54 and pressed outwardly by a corrugated spring 50 having one end fixed to an end of a bar 52. The other end of the latter is connected to links 56. 57. The links 57 are secured to a pin 59 fixed in the rod 36 which is slidable in a tube 29, the lower end of the pin 59 engaging a recess in a pivoted link 60 which is connected to a cam-actuated rod 62, movement of the latter being transmitted through the members 59, 57 52 and 50 to clamp the record between the members 48. The record is now given a vertical movement to free it from the central pin on the turntable by lifting the column 35 by operating a bell-crank lever 64 connected; to a cam-operated link 72, the parts 59, 37 being thus disengaged from the levers 60, 45, respectively. A tension spring 74 connected to the lever 64 assists in the lifting operation. The record is now swung laterally clear of the turntable by turning the column 35 in its support 63 by a cam link 82 engaging a pin 81 on an arm 80 fixed to the pillar 35. A toothed wheel 85 is then in a position above a pair of toothed racks 88, 89. During a downward movement of the pillar 35, the wheel 85 engages the rack 88 to turn the record through 90‹. The pillar 35 after being turned slightly to engage the wheel 85 with the rack 89 is now given an upward movement to turn the record through an additional 90‹. A spring plunger 90 engaging flats on the sleeve 29 ensures a horizontal position of the record. The record is then swung back over the turntable and lowered to engage the record with the central pin 4 and to bring the levers 60, 45 into connection with the ends of the members 59, 37 that previously were uppermost. The cam rods 62, 47 then operate to release the record and swing the arms 25, 26 outwardly. The construction may be modified so that the record may be turned through 180‹ during a movement of the column 35 in one direction up or down, and the record may also be reversed without swinging it out laterally clear of the turntable.