GB1352891A - Method of production of multisectional filament coils and control system of a coiling machine operating according to this method - Google Patents

Abstract

1352891 Coiling KOSZALINSKIE ZAKLADY MASZYN LAMPOWYCH UNIMASZ 9 Sept 1971 [12 Sept 1970 13 April 1971] 42091/71 Heading B3E An incandescent lamp filament is produced by wrapping an outer wire 3 on a core wire 4 to form helical portions 5 separated by substantially straight portions 9, the direction of rotation of the outer wire being reversed for a predetermined angular amount on completion of each straight portion and prior to commencement of the succeeding helical portion to relieve stress in the outer wire and to minimize distortion in the straight portion. A control circuit is shown in Fig. 2 in which a motor 11 for axially moving the core wire is controlled with impulses from a disc 19 and light 20, and a motor 12 for rotating a spindle 1 is controlled by an impulse generator 16. A counter 29 counts the number of pulses from the disc 19 and a light 21 so that when the required number of spindle revolutions is reached the counter opens contacts 14 and 28 to stop the spindle. Simultaneously a clamp 8 is actuated to clamp the outer wire 3 to the core wire and contacts 13 and 31 are closed so that the motor 11 is now controlled by the impulse generator 16 and operates with increased speed to form the straight portion. A counter 30 counts the number of pulses from a disc 17 and light 18 and when a preset value is reached it closes contacts 15 and 28 in order to reverse the drive of the spindle. When the disc 19 and light 21 provide a pulse a clamp 7 is actuated to clamp the wire 4 and the contact 14 is closed and contacts 13, 15 and 31 opened so that rotation of the spindle in a direction opposite to the last mentioned direction can begin. The length of the straight portions can be changed by a counter 33 which counts the number of straight portions up to a preset value and then changes a switch 32 to a second channel of the counter 30.