Control system for an unwinding roll

Details Control system for an unwinding roll Control system for an unwinding roll

1977-10-05

1979-04-24

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92CT, 235 92CP, 235 92DP, 235 92R, 242 57, 242 581, 364562, G06M 302, B65H 1908

Patent

active

041514033

ABSTRACT:
An optical encoder generates a train of digital pulses as a function of the length of web material unwound per revolution of an unwinding roll. A counter counts the encoder pulses for each revolution of the roll. The counts of the encoder pulses are accumulated over a first set of revolutions of the roll. A programmed microprocessor effects a base computation of (1) the average change in the number of pulses generated per revolution of the roll and (2) the length of web remaining on the roll after the first set of revolutions. Thereafter, the base computation of web length is updated at each revolution of the roll. The counter may comprise an addressable hardware counter chain alone or in combination with a read/write memory which counts the number of times that the counter chain overflows.

REFERENCES:
patent: 3834648 (1974-09-01), Rose et al.
patent: 3953713 (1976-04-01), Ligt
patent: 4001562 (1977-01-01), McEnery
patent: 4086470 (1978-04-01), Ashbee

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