Electronic circuit for electronic stencil cutter

Details Electronic circuit for electronic stencil cutter Electronic circuit for electronic stencil cutter

1975-09-12

1977-05-03

Habecker, Thomas B.

Facsimile and static presentation processing

Facsimile

Recording apparatus

346163, H04N 100

Patent

active

040216055

ABSTRACT:
Stencil cutting apparatus for electrically burning information from an original document into a stencil material having non-linear burning characteristics by the application of electrical pulses to a stylus contacting the stencil material positioned on a rotatable cylinder, includes a photomultiplier for scanning the original document and providing an output signal the amplitude of which is proportional to the light reflected by the information thereon, a circuit including a square wave oscillator and wave shaping network which alters the square wave in relation to the burning characteristics of the stencil material to produce a resultant train of pulses and a comparator circuit which adds the photomultiplier signal and train of pulses. The comparator provides output pulses having a width determined by the addition of the last-mentioned signal and pulses which are fed to the stylus for burning the stencil. The cylinder upon which the stencil material is mounted includes a magnet which revolves as the cylinder rotates. The movement of the magnet past a sensing coil produces a signal to discontinue the burning as the stylus passes over the stencil clamp of the cylinder.

REFERENCES:
patent: 3801738 (1974-04-01), Egerton
patent: 3952144 (1976-04-01), Kolker

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