Patent GB-706444-A (GB)
Title: Selective record changer
Inventor: ANDRES LLOYD JOHN
IPC: G11B17/24
Filed: 1951-11-14
Abstract: 706,444. Magazine gramophones. PERMO, Inc. Nov. 14, 1951; No. 26683/51. Class 40 (2). Records 5, Fig. 2, are supported vertically and radially with respect to the axis of the turntable 2 in a magazine 3. Each record has corresponding latches 9, 10 corresponding to each side of the record. On depressing a lower latch 9 or raising an upper latch 10, the latches are moved inwardly by springs 55, Fig. 5, and surfaces 69 or 67 on the latches engage cam surfaces on plates 68 or 63 to move them laterally in opposite directions against spring pressure, Fig. 3. Movement of either plate moves an arm 72 to close a master switch, Fig. 11 (not shown). The turntable is then driven from a motor 17, by a spindle 19, and friction disc 18. A master cam plate 23, Fig. 5, is driven from the turntable-spindle 21 through a gear 26, and a pawl on the gear which engages a toothed wheel 24 mounted on the shaft 21 see Figs. 6 to 9 (not shown). A scanning plate 78 which carries the record transfer head is now oscillated laterally by a cam roller engaging a cam groove 49 in the plate 23, which roller drives plates 89, 92, and the plate 92 drives the plate 78 through a friction disc. As the plate 78 oscillates pawls 105, (106), Fig. 15, engage any projecting latch which has been selected and thus holds the plate in this position, the friction disc drive allowing the cam 23 to continue rotating while the plate 78 is held. The pawls 105, (106) alternately scan the latches 9, 10 as the pivoted beam 99 on which they are mounted is moved by a cam surface, Fig. 16 (not shown), in a plate 110, Fig. 3, which is moved by abutments 136, 135, Fig. 3, as the plate 78 swings first in one direction and then the other. When the cam groove 49 has driven the plate 78 to scan the latches four times, the groove 49 becomes radial, and the drive to the plate 78 ceases. A groove 48, Fig. 5, in the cam 23 then begins to drive a cam 152 having a groove 153 which acts through a roller 154 to reciprocate a rack 128. Movement of the rack drives a pinion 131 which through gears, Fig. 21 (not shown), moves a toggle mechanism 168, Fig. 23, to cause members 179, 171, Fig. 4, to grip the selected record. The arm 8 is then rotated about the axis 162a by gears, Figs. 21 and 24 (not shown), driven from the pinion 131, to withdraw the record from the magazine. When the plate 110, Fig. 15, was moved to cause the pawls to scan either the top or bottom latches, the plate also moved a plate 118 through a beam 115 to either one of two positions. Thus a stud 183, Fig. 23, on the plate 118 is in either one of two positions, depending upon which side of the record is to be played. After the arm 8 has rotated about axis 162a through a predetermined angle, the stud 183 enters either one of two cam grooves 188, 187, Fig. 25, in a cam 176 depending upon its position, to bring the selected side of the record into the playing position on the turntable. The tune arm which may have a bearing of the type described in Specification 705,963 is lifted and lowered and swung to and from the record by a spindle 197, Fig. 27. When the selected record is on the turntable, cams 50 and 204 on the cam plate 23 swing the tone arm over the record and lower the needle into contact with the starting groove. An abutment on the cam plate 23 then causes the pawl to disengage the gear 26, Fig. 5, and toothed wheel 24 and stop the cam. The tone arm then moves across the record under the action of the record groove, until a lever 203, Fig. 27, engages a trigger 35 which acts to re-engage the gear 26 and wheel 24 and rotate the cam plate 23. The cam grooves in the plate 23 effect the return of the record to the magazine. The latches are then scanned again and if another has been pressed the playing cycle begins again.' As the rack 128 moves forward during the return cycle, the end 133, Fig. 5, of the rack engages an arm 134 on a member 108 to move the latch back to its inoperative position. A modified form of mechanism for driving the plate 78 and rack 128 is described with reference to Figs. 28 to 30 (not shown).