Patent GB-333481-A (GB)
Title: Improvements in talking machines
IPC: G11B17/00
Filed: 1929-12-03
Abstract: 333,481. Victor Talking Machine Co. Jan. 15, 1929, [Convention date]. Multiple machines; tone - arm joints; returning sound-box to starting - point; turntables.-The rotating turntable B of a magazine gramophone is arranged to be movable axially, and means are provided with which a record R is caused to contact during the axial movement of the turntable so that a translational movement is imparted to the record through the r o t a r y movement of the turntable. The records to be played are fed in succession from a magazine P mounted on a shelf 3, Fig. 2, and after playing are adapted to move to a receptacle C. The turntable B, which may have a layer of felt or the like on its upper face and is mounted so as to be inclined downwardly from right to left when viewed in Fig. 2, is driven from a motor by a shaft 5 keyed to the stem 61 of the turntable, so as to allow the latter to slide vertically on said shaft. Encircling a bushing on the shaft 5 is a freely rotatable cam 47 having cam surfaces 47<a>, which are engaged by cam followers 49 carried by arms 50 on a sleeve 51 slidable within the bushing. A second arm 52, formed integrally with the arms 50, slides along a fixed vertical rod 53. The cam 47 has a gear wheel 48 periodically engaged by a gear 18, comprising a hub portion 18a receiving a cam 20. The shaft 5 is geared to a wheel 8, which is freely rotatable on a shaft 9, and is secured to a clutch wheel 13 as shown in Fig. 5. A clutch crescent 14, pivoted on a disc 16 fixed to the shaft 9, has a tooth 14<a> which is spring-pressed into engagement with the clutch wheel 13 so as to cause the disc 16 and shaft 9 to be rotated from the shaft 5. An arm 36, movable with the tone-arm 27, is provided with a pawl 37 adapted to coact with a rack 38 on one end of a lever 39, which is mounted on a shaft 40 and carries at its other end a cam follower coicting with the cam 20, Fig. 2. Also mounted on the shaft 40 so as to rotate with the lever 39 is a lever 42 having a hook-shaped end 42a for coaction with the clutch crescent 14. The tone-arm 27 is mounted by means of a plate 32 supported on a second plate 31 carried by the shelf 3, the plate 32 comprising an upstanding part 32a partly surrounding the vertical portion of the tone-arm, and having at its upper end a vertical pin engaging the tone-arm. The members 31, 32 are mounted on the shelf 3 so as to slope slightly in the opposite direction to the slope of the turntable whereby the tone-arm is urged outwardly of the record within the limit permitted by a stop 34. During reproduction, the sound-box S moves from right to left, Fig. 1, and the member 36 correspondingly moves, causing the pawl 37 to slide freely over the rack 38. When the direction of movement of the tonearm is reversed, as for example, by an eccentric groove in the record, the pawl 37 moves the rack 38 and swings the levers 39, 42 so as to cause the clutch member 14 to connect the shaft 9 and shaft 5. Up to this time, the turntable has been driven in its uppermost position, but rotation of the shaft 9 effects rotation of the cam 47 whereby the cam followers 49 cause the turntable to fall abruptly. During this falling movement one edge of the record R on the turntable is engaged by the top of a post 96 on a shelf 4<a>, and a diametrically opposite edge simultaneously engages a roller 95. As a result, the record R pivots around the post 96 and, since it is rotating clockwise, is caused to move from right to left, partly under gravity, and passes over a roller 100 into the compartment C. When the turntable commences to descend, the sound-box S moves downwardly a short distance until arrested by the engagement of a stop 108, Fig. 15, on the part 29 of the tone-arm carrying the sound-box; with an adjustable screw 107 on a bracket 106 secured to the main part 27 of the tone-arm, and the sound-box and tone-arm then swing by gravity in a counter-clockwise direction until stopped by member 34. Rotation of the shaft 9 also effects rotation of a shaft 19, Fig. 2, through gearing, and this swings a crank arm 21 so as to cause a record-translating arm T to move first clockwise and then anti-clockwise. The arm T is connected with the arm 21 through links 81, 82, 84, and stud shaft 85, and is provided at its free end with a member 86, Fig. 11, to which a record-engaging member 88, having a curved end 88<a> is pivoted. The member 88 is provided with a toe portion 89, between which and the portion 88<a> a record R is adapted to be received. The record is guided in its swinging movement by members 92 secured to the shelf 3, and is brought into its correct position over the turntable spindle 59 with its advanced edge engaging the sloping face 97<a> of a bracket 97. The turntable then rises and engages the record, lifting the latter in its vertical movement and causing the record to engage and raise the sound-box. The arm T is also returned to its initial position. The cam 20, after rotation through 360‹, operates the spring-controlled lever 39 to effect disengagement of the clutch mechanism. The magazine P comprises a cylindrical receptacle 67 mounted on the shelf 3, the records being mounted on a perforated plate 69 having a felt surface 70 and forced upwardly by spring members 72 secured to the bottom wall of the receptacle, as shown in Fig. 11. To position the records on the magazine P, there are provided, as shown in Fig. 1, a bracket 76, and a pivoted member 77 having a, plurality of projections 77<a> adapted to be held in engagement with a record by a spring latch device 79, 80. To effect repetition of a record then on the turntable, a. lever 109, Fig. 1, may be turned so as to cause a second lever 112 to engage the record and prevent it being returned to the receptacle C, and the member 88 at the end of the arm T is turned to inoperative position.