Patent GB-300813-A (GB)
Title: Improvements in the stopping means of talking machines
IPC: A47F13/04
Filed: 1927-12-19
Abstract: 300,813. Waterworth, E. N. Dec. 19, 1927. Stopping. - Relates to a modification of the automatic stopping mechanism described in Specification 269,043 wherein a pivoted lever carrying a tooth member is intermittently rocked by the machine driving gear into position for operation of a, stop mechanism by the tooth; but so long as the tone arm is traversing the record, the lever is returned thereby after each movement to prevent operation, of the stop mechanism until, on cessation. of traverse of the tone-arm, the pivoted member is not returned and the stop mechanism is actuated by the tooth. As in the prior Specification, the turntable spindle 13 carries a pinion 17 gearing with a wheel 18 on a plate 20 freely mounted on the spindle and carrying a pawl 24 for engaging a notched quadrant 33 to actuate the stop mechanism, which may apply a brake to the turntable or actuate a switch in the driving motor circuit, and projections on the wheel 18 act respectively to rock the pivoted lever and, when the tone-arm no longer traverses, to engage the tooth member thereon. According to the invention, the tooth member is retained in its operative position for effecting actuation of the, stop mechanism on cessation cf traverse of the tone-arm by the engagement of a pivoted latch on the pivoted lever with a movable stop controlled by the moving tone-arm. As shown, a pivoted lever 25, Fig. 1, carrying a. pivoted latch 26 and a pivoted tooth 27 is intermittently rocked by a cam 22 on a wheel 18 mounted on a plate 20 pivoted on the turntable spindle 16, the cam first rocking the catch 26 to carry a flange 29, Fig. 2, thereon to one side of a movable stop 15, and then the lever 25 so as to carry the flange beyond and behind the stop. The stop 15 is fixed on a rod 11 extending through a guide 13 and mounted on the pivot 8 of a plate 7 to which it is frictionally held by a spring and during the early part of the traverse of the tone-arm 4 the rod 11 rests on a raised part 40 of the plate 7 so that the stop is out of action whilst a pin 6 carried by an arm 5 moving with the tone-arm travels over the part 10 of the plate. As the tone-arm continues its inward traverse, the pin 6 enters a slot 9 and turns the plate, thereby carrying the raised part 40 clear of the rod 11 so that the stop 15 is lowered into operative relation with the flange 29. The cam 22 after rocking the lever 25 acts on the dawnturned free end 14 of the rod 11 to move the stop 15 into the path of movement of the flange 29, but before this can engage it, the rod is rocked by its frictional engagement with the plate 7 so that the stop is carried clear of the flange. When the tone-arm and plate 7 no longer move, the stop arrests the upward rocking movement of the lever 25 so that the tooth 27 carried by the lever remains in the path of a pin 21 on the wheel 18, whose continued rotation now effects a rocking of the plate 20 on its pivot 16. A pawl 24 on this plate 20 engages a. notch 50 in, and rocks, a lever 33 linked to a starting dial 31 and controlling a switch 38 in the motor circuit or a brake lever. When the part 44 of the lever 20 engages the lever 33, the continued rotation of the wheel 18 acting on the tooth 27 rocks the lever 25, causing an inclined flange 28 on the latch 26 to move the stop 15 laterally clear of the lug 29 so that when the pin 21 has escaped past the tooth 27 the plate 20 can be returned by its spring 23 and the switch lever 35 can ride down over the shoulder of the lever 33 to break the circuit. A spring 13a bearing on the plate 7 steadies its motion, and an incline at the rear of the cam 22 renders the return movements of tbs lever 25 and latch 26 gradual. The stop motion may be applied to the machine described in Specification 281,003.