Patent GB-319311-A (GB)
IPC: G11B3/095
Filed: 1928-10-30
Abstract: 319,311. Schwanke, E. Sept. 20, 1928, [Convention date]. Addition to 315,379. Returning sound-box to starting point.-The repeating mechanism for gramophones claimed in the parent Specification is modified by arranging that the member which is geared to the running- wheel g for effecting the positive raising and lowering of the tone-arm, moves or rotates in a plane substantially at right-angles to the plane of the running-wheel. The following arrangements are described : (1) The running-wheel g and pinion 6 are mounted in a frame pivoted at 91 to the carrier 7 as shown in Figs. 1 and 2, and a toothed rack 42 is adapted to be moved transversely against springs 76 into engagement with the pinion 6 by means of a feeler device 4 contacting with the turntable spindle or other stop. The rack 42 is then moved longitudinally by the pinion 6 in such manner as to cause a roller 84 on the carrier 7 to engage successively the three upper faces 43, 42, 44, of the rack, the tone-arm being raised and lowered during the ascent 42 and descent 44 respectively; (2) the pinion 6, which with the running wheel g is mounted on an arm 92 pivoted to a bracket secured to the carrier 7 as shown in Fig. 3a, engages a crown wheel 45 provided with a gap 8, Fig. 4, wherein the pinion is located during playing of the record, and raising and lowering curves 47, 48. The feeler device 4 is adapted to operate a member h pivoted on the axis of the crown wheel so as to release a pawl i from engagement with the crown wheel and spring-controlled roller 39 then engages a cam 35 and causes rotation of the crown wheel 45 into engagement with the pinion 6; (3) a roller 86, Fig. 5, on the carrier 7 engages a cam 51 which is driven from the wheel g by a worm 49 and worm wheel 50. The wheel g, cam 51 and gearing are slidable vertically in the carrier, and the worm wheel 50 is provided with a toothless portion; (4) a screw 52, Fig. 7, on the axis of the running-wheel g engages a threaded member 53 carried by one end of a spring-controlled lever 54 pivoted on an axis 58, the other end of the lever being provided with a roller 55 engaging a cam plate 60. A lever is adapted to strike the turntable spindle or other stop and cause the roller 55 to engage the cam 60 and thereby effect engagement of the member 53 with the screw 52 and the desired movements of the tone-arm. A spring is adapted to return the lever 54 longitudinally when the tone-arm has been swung outwardly ; (5) the latter arrangement is modified by the provision of a screw 64, Figs. 10, 11, so shaped that when engaged by a pin 65 carried by the part 7 the tone-arm is raised by the steeply curved portion of the screw, reversed whilst the pin engages the cylindrical portion, and lowered b means of the gently curved portion. The pin 65 is normally held in a curved slot 71, Fig. 11, by an arm 3, and when released is moved by a spring 67 into the end of the slot 66 where it engages with the screw 64. To ensure the pin 65 passing from the slot 66 into the slot 71 at the end of its movement it may be provided with a projection which engages an auxiliary worm mounted upon the axle of the running-wheel g. The Specification as open to inspection under Sect. 91 (3) (a) describes also repeating mechanism comprising a toothed wheel 1 mounted on a shaft which carries an arm 38, Fig. 1, (Cancelled), having a slot 37 wherein a wheel 39 slides against the action of a spring 40. The wheel 39 runs over a. cam disc 35 carried by a hollow shaft 36 enclosing the main shaft. During playing of a record, a catch 41 on the toothed wheel 1 engages a lever 3 controlled by an arm 4. When the arm 4 strikes the turntable spindle f, the catch 41 is freed, cam 35 is rotated until the toothed wheel rotates a pinion 6 carried by the axle of the running-wheel, and the tone-arm is raised and transferred. This subject-matter does not appear in the Specification as accepted.