Register control system, particularly for off-line web finishing

Details Register control system, particularly for off-line web finishing Register control system, particularly for off-line web finishing

1993-09-09

1995-10-03

Trammell, James P.

Boots, shoes, and leggings

364469, 364188, 377 17, 226 27, G05B 1302

Patent

active

054557640

ABSTRACT:
A register control system, particularly one that registers marks on a printed web to a function cylinder, produces proportional and integral gains each independently variable to control the take over point of the integral gain with respect to the proportional gain. The accumulating integral gain is zeroed out after cross over if the proportional gain exceeds a preset percentage of the integral error band. The overall system gain is varied with the line speed independently of the proportional and integral gains to provide speed-insensitive control. The direction of automatic correction is always selected to return the system to register in the shortest distance possible. High frequency clock pulses are counted between encoder pulses to interpolate with high accuracy the angular position measurement of the marks and a homing pulse. A real-time analog display presents each revolution of the cylinder as a vector arrow with an inspection zone, set point, registration mark(s) and function cylinder homing point displayed along the arrow. The inspection zone is attached to a selected mark. In a more general form, the system controls the register between moving members such as two rotating shafts.

REFERENCES:
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patent: 5267546 (1993-12-01), Siebet et al.
patent: 5317614 (1994-05-01), Davis et al.

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