Method and apparatus for controlling a web handling device

Details Method and apparatus for controlling a web handling device Method and apparatus for controlling a web handling device

1976-03-01

1977-09-06

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

318603, 101181, 197127R, G05B 1928

Patent

active

040470857

ABSTRACT:
A circuit for controlling a graphic display printer wherein a paper sheet is wrapped about a rotating drum and maintained in place thereon by a vacuum. The length of the paper sheet is slightly longer than the circumference of the drum and thus defines a tangentially projecting flap. A sensor detects passage of the flap and in response to the initial detection, a counter is started having a cycle corresponding to one rotation of the drum. Selected states of the counter are digitally compared to the output of the flap sensor. After the rotational position of the flap has been determined twice for each of three successive drum revolutions, a paper validation signal is generated indicating that the paper is properly wrapped about and rotating with the drum. In response to the validation signal, printing is started. The circuit also includes means for preventing writing on the flap by correctly locating the copy with respect to top of paper and for maintaining a straight, first, print line irrespective of the characteristics of the paper edge or its positional sensing variations.

REFERENCES:
patent: 3833843 (1974-09-01), Bossons
patent: 3974432 (1976-08-01), Thompson
patent: 3997828 (1976-12-01), Bottcher

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