Web cutting control system

Details Web cutting control system Web cutting control system

G - Physics

05

D

341/41

G05D 5/06 (2006.01) B23D 36/00 (2006.01)

Patent

CA 1075347

ABSTRACT OF THE DISCLOSURE 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 whose number 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 cutting complete point 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. - 1 -

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