Web cutting control system

Details Web cutting control system Web cutting control system

1975-05-29

1977-04-26

Hickey, Robert J.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

83 74, 83 76, 318603, G05B 1926, B26D 520, B26D 540

Patent

active

040204065

ABSTRACT:
A web cutting control system controlling the speed of a rotary cutter for automatic, continuous and precise cutting of a web fed at a constant speed into predetermined lengths or on the marks on the web. Two transducers generate pulses the number of which corresponds to the web feed length and the rotating angle of the rotary cutter, respectively. Three sensors detect the marks on the web, the completion of cutting, and the arrival of the cutter blades, respectively, to control the flow of signals. A desired cutting length or the distance between the mark detection point and the point of completion of cutting is preset. A reversible counter receives the pulses from these two transducers and the difference signal between the preset value and a reference signal and performs reversible counting thereof, the result of which is used to control the speed of motor for the rotary cutter to bring its speed into synchronization with the web feed speed for accurate cutting.

REFERENCES:
patent: 3181403 (1965-05-01), Sterns et al.
patent: 3604300 (1971-09-01), Allison et al.
patent: 3668957 (1972-06-01), Nido
patent: 3706248 (1972-12-01), Erhart
patent: 3730810 (1973-05-01), Klein
patent: 3870936 (1975-03-01), Coberly

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