Web advancement and cutting mechanism and method

Details Web advancement and cutting mechanism and method Web advancement and cutting mechanism and method

1975-10-31

1977-11-01

Abercrombie, Willie G.

Cutting

Tool engages work during dwell of intermittent workfeed

Work-sensing means to control work-moving or work-stopping...

83 62, 83371, B26D 532, B26D 534

Patent

active

040560244

ABSTRACT:
A web advancement and cutting method and mechanism are provided for a web which is divided into unique segments or frames each incorporating a sensing indicium and in which a plurality of frames is advanced through a cutting mechanism and cut from the web for each cycle of operation. In each cycle of operation, a digital stepper motor drive and counter combination advances the web a predetermined number of counts, generally equivalent to moving all but one of the said plurality of frames to be advanced beyond the cutting plane of a cutting mechanism, and then further advancing without stopping the web until an optical sensor senses the indicium on the last frame to be advanced through the cutting mechanism. The stepper motor is stopped and said plurality of frames is then cut from the web. Means are also provided to reduce the power consumption of the stepper motor while the cutting mechanism is actuated. This invention is described in connection with a commercial processing film cutter which cuts a customer's individual rolls of film into strips of several frames for packaging after processing. The cutting mechanism may be adjusted for different types of film and customer requirements by adjustment of the digital counters associated with the stepper motor advancement mechanism.

REFERENCES:
patent: 3763728 (1973-10-01), Blackman
patent: 3793915 (1974-02-01), Hujer
patent: 3945279 (1976-03-01), Boehme et al.

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