Patent GB-588048-A (GB)
Title: Automatic phonograph
IPC: G11B17/02
Filed: 1944-11-10
Abstract: 588,048. Magazine gramophones. FARNSWORTH TELEVISION & RADIO CORPORATION. Nov. 10, 1944, No. 22189. Convention date, May 10, 1943. [Class 40 (ii)] A magazine gramophone has an inclined magazine reversible by rotation about a vertical axis and a support member arranged to carry records to and from the turntable, a record being delivered from one side of the magazine and carried to the turntable when the magazine is in one position and the magazine being reversed after the record has been played. and the record transferred from the turntable to the magazine. Driving arrangements. The turntable 17 is rim-driven by a friction gear 22, engaging internally of a depending flange on the turntable. The automatic mechanism is driven from a pinion 100 on the spindle 16 of the turntable, pinion 100 engaging a mutilated gear 101, which normally rests with its mutilation 103 presented to the pinion. Automatic initiation and timing of recordchanging operations. Gear 101 carries cams 105, 143, Fig. 4, and 107, 127, Fig. 3, which control respectively the raising and lowering of the pick-up, the reversal of the magazine, the horizontal swinging of the pick-up arm, and the movement of the member 70, which trans-, fers records between the turntable and the magazine. Gear 101 is brought into driving engagement with pinion 100 when the inward movement' of the pick-up beomes more rapid at the end of the playing of a record. The more rapid movement causes the actuation of a tap-tap mechanism, comprising arm 148 mounted on the hollow spindle 29 of the pick-up arm and frictionally coupled to the pick-up arm. As the pick-up arm moves inwardly, arm 148 moves clockwise, as seen in Fig. 4, and engages a tap-tap lever 153, which is normally knocked back at each revolution. of pinion 100 by a cam 156. When the rate of movement of the pick-up arm and arm 148 increases, cam 156 engages the leading edge on the end 157 of lever 153, causing a lug 150, on arm 148, to engage a lug 178 on gear 101, which is forced to move to bring gear 101 into driving engagement with pinion 100. Magazine and record-changing. Magazine 40 consists of an annular frame within -which records are normally retained by a lower flange 43, and lugs 44, at the top of the magazine. An adjustable bracket 46 is arranged to be positioned over lugs 44, to increase their effective inward extent. With large records in the magazine, bracket 46 is clipped in the raised position, shown dotted in Fig. 2, by engagement of a spring clip 47 on the magazine frame. The magazine is carried on a vertical spigot 35 and is rotated by engagement of a rack 38, carried on a sliding bar 39, with a gear 37 on the spigot. Bar 39 is located by and slides about spigot 35 and spindle 102 of gear 101 as constrained by engagement of pin 141 in cam groove 143 on gear 101. As bar 39 moves from the extreme position, shown in Fig. 4, a pivoted lever 93, on the bar which is held against stop 95 by spring 96, engages an arm 88 on shaft 78, carrying members- 81, 82, which position a record ejected from the magazine on support member 70. Shaft 78 is turned against the action of a spring, not shown. Records are ejected from the magazine by lever 50, pivoted on the magazine, as shown in Fig. 9. As the magazine is turned from the full-line. position in Fig. 2, to the dotted-line position, the inner end of lever 50 is engaged by a lever 63, carried on one end of the shaft 61, carrying member 70. Thus, as the magazine is rotated and the support member raised, the front record of the stack is lifted over the flange 43 and falls on to the support 70. Members 81, 82 centre the record on the support, their movement being normally sufficient to centre a small diameter record, but being restrained in the presence of a large diameter record by engagement of the record, with projections 71 on member 70. After the record has been played, it is returned to the magazine, now in its full-line position, by raising of member 70, the record being guided. into the magazine by members 42 at the bottom of the magazine. Movement of member 70 is effected by oscillation of the sliding bar 123, Fig. 3, which is mounted about spindle 102 and is linked to a segmental driving gear 66, pivoted on, a bracket 69. Gear 66 engages a semi-circular gear 65 on the shaft 61, to which support 70 is secured. Spring 128 to a large extent counterbalances the weight of support 70 and the record. Oscillation of bar 123 is effected by engagement of a pin 126 thereon in cam groove 127. Bar 123 also carries spring latch 130, having a roller 132, which engages in notch 133 in the periphery of gear 101 to maintain the gear against accidental displacement. Pick-up return and positioning mechanism. Rigid with the spindle 29 of the pick-up arm is an arm 108, Fig. 4, having a pin 109, which enters an aperture 110 in an arm 112, pivoted at 114, and having an extension 116, Fig. 3, carrying a projection 117, which is constrained into engagement with cam 107 on gear 101. As the gear rotates from its position of rest, arm 112 moves inwardly and carries arm 108 to the correct position for lowering the pick-up on to the record. When the record fed to the turntable is of large diameter, spring-latched rod 165, Fig. 5, is depressed to bring an abutment into the path of an adjustable screw 173, on arm 112, to limit the inward movement of the arm, as required. Rod 165 is restored to its unoperated position by engagement of a cam projection 178 on gear 101 with the lower end of the rod after the record has been removed from the turntable. The pick-up is raised by engagement of a push-rod 31, which passes axially of spindle 29, with cam 109. The pickup is lowered only when gear 101 is in its position of rest. Cycle of operations. The first record to be played is placed by hand on the turntable and the pick-up needle placed in the lead-in groove of the record. After the record has been played the tap-tap mechanism operates and gear 101 revolves. This raises the pick-up clear of the record and the pick-up is then swung outwards. Member 70 then rises and transfers the record to the rear side of the magazine and is then retracted while the magazine is reversed. This causes a fresh record to be fed to support 70, which is raised to receive the record. The support is then lowered to transfer the fresh record, after centring, to the turntable and the magazine restored to its initial position. The pick-up is then applied to the record and rotation of gear 101 is interrupted.