Patent GB-266637-A (GB)
Title: Repetition device for talking machines
IPC: G11B3/095
Filed: 1926-10-28
Abstract: 266,637. Miksch, E., and Miksch, E. March 4, 1926, [Convention date]. Returning sound-box to starting point; records; starting, stopping and brake arrangements.-Relates to repetition devices carried by the tone arm and comprising a contact roller which on completion of playing of a record is automatically lowered into contact therewith whereby the sound-box is raised and returned to starting position. The device comprises a casing 1, Fig. 1, adjustably supported by a rod 4 from a yoke 5 embracing the tone arm 9 adjacent to the sound-box 8. The casing contains a lever 23 mounted on a pivot 45 and carrying a contact roll 25 covered with soft rubber. On completion of playing of a record, a stop secured thereon or a recess therein releases an escapement which permits a spring 29 to lower the roll 25 on to the record whereby the sound-box is raised, and the tone arm is returned to starting position with the stylus over the outer sound trace, without the aid of stop devices, by adjusting the device so that the plane of the roll when in this position is tangential to the record. Provision is also made for repeating a desired number of times. The movements of the roll 25 are controlled by pivoted pawls 30, 31 which alternately engage ratchet teeth on a wheel 19, Fig. 9, fixed to the hub of a drum 18 connected through a spring 17 with a spindle 10 mounted in a sleeve 11 on the casing and provided with a hand-wheel 12 for winding the spring and with a ratchet disc 16 held by a pawl. A cord 27 passes from a pulley at the side of the contact roll 25 to a pulley 21 freely mounted on the hub of the drum 18 and provided with an internal spring 28 tensioning the cord 27. At the completion of playing of a record, a member 33 carried by the pawl 30 and protruding through the casing is carried against a stop flxed on the record, or alternatively is lowered into contact with the record by the stylus descending into a recess provided therein, and the pawl 30 is thereby disengaged from a tooth on the wheel 19 which is then rotated by the spring 17 until arrested by the other pawl 31. In this movement, one of several projections 20 on the wheel 19 is carried clear of the spring-controlled lever 23 which now lowers the roll 25 on to the record, whereby the tone arm is carried to starting position, the roll acting as a brake on the turntable, and the pulley 21 is rotated aaginst its spring 28 by the cord 27. A lug 35 on the pulley 21 is thus carried against, and disengages, the pawl 31 from the wheel 19 which can then be rotated another step by the spring 17 so that another projection 20 rocks the lever 23 to raise the roll 25 and allow the sound-box to descend into playing contact. Provision is made for repeating a number of times by supporting on the projections 20, Fig. 9, a disc 22 carrying numerals representing stop movements of the ratchet wheel 19 and arranged behind a setting disc 14 which is fixed on the spindle 10 and provided with an aperture 15 and with a pin 38 adjustable, by means of the hand-wheel 12, in a circular groove in the disc 22. When the number of movements of the wheel 19 corresponding with the setting have taken place, the end of the groove is carried against the pin 38 and further repetition arrested, the roll 25 acting as a brake to arrest the turntable. When the device is applied to electrically-driven machines, the lever 23 may carry a contact for completing the circuit to the driving motor when depressed by one of the projections 20. Such circuit is temporarily disconnected at the end of each repetition, and is permanently disconnected after the desired repetitions owing to the disc 22 and wheel 19 being arrested with the projections 20 clear of the lever.