Advancing material of indeterminate length – With material-responsive control means – To regulate longitudinal movement of material
Patent
1986-08-29
1988-07-19
Petrakes, John
Advancing material of indeterminate length
With material-responsive control means
To regulate longitudinal movement of material
226 29, 83 74, 83 76, B65H 2304, B26D 520
Patent
active
047579307
ABSTRACT:
A method of generating a signal indicative of the passage of indicia on a moving web of material at a preselected reference station along the web without use of an indicia sensing device at the selected reference station comprising locating an indicia sensing device at a sensing station at a preselected distance of web travel upstream of the reference station; generating an indicia detection signal having sensing pulses coinciding with the passage of indicia at the sensing station; measuring the distance of web travel occurring after each sensing pulse in the indicia detection signal; generating an indicia reference signal having reference pulses coinciding with the passage of indicia at the selected reference station by providing a reference pulse corresponding to each sensing pulse and occurring thereafter at a point in time at which the measured distance of web travel after a corresponding sensing pulse is equal to the preselected distance of web travel between the sensing station and the preselected reference station.
REFERENCES:
patent: 3397634 (1968-08-01), Betts et al.
patent: 3556509 (1971-01-01), Crum
patent: 3559568 (1971-02-01), Stanley
patent: 3601587 (1971-08-01), Thiede
patent: 3774016 (1973-11-01), Sterns et al.
patent: 4264957 (1981-04-01), Pautzke
Adolph Coors Company
duBois Steven M.
Klaas Bruce G.
O'Meara William P.
Petrakes John
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