Advancing material of indeterminate length – With material-responsive control means – To regulate longitudinal movement of material
Patent
1980-06-27
1982-11-30
Christian, Leonard D.
Advancing material of indeterminate length
With material-responsive control means
To regulate longitudinal movement of material
364469, 101248, B65H 2318, G06F 1546
Patent
active
043612601
ABSTRACT:
A register control (21) is provided for a web handling apparatus (22) having a drive motor (29) operatively moving a web (23) containing repetitive indicia (34) through a sequencially operating function apparatus (27) performing repetitive operations on the web. A control (41) responds to the speed of the drive motor (29) and the position of the function apparatus (27) and the position of the indicia (34) to provide a speed command signal (V.sub.c) to a full wave regenerative thyristor control circuit (38) to operatively control the operating speed of a pair of nip rolls (25, 26) through the controlled energization of a corrective motor (35) to maintain registration between the function apparatus (27) and the indicia (34). The control (41) provides a timed modification to a sensed speed signal V.sub.s for providing a modified speed command signal (V.sub.c) when the system is out of registration. A speed command modification circuit (213) responds to an advance modification timing circuit ( 79) and an advance coincidence circuit (81) to increase the speed of the correction motor (35) and responds to a retard timing modification circuit (78) and a retard coincidence circuit (80) to decrease the operating speed of the correction motor (35).
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