G - Physics – 05 – B
Patent
G - Physics
05
B
101/49, 342/5
G05B 17/02 (2006.01) B41C 1/14 (2006.01)
Patent
CA 1057836
ABSTRACT OF THE INVENTION Stencil cutting apparatus for electrically burning information from an original document into a stencil material having non-linear burning char- acteristics by the application of electrical pulses to a stylus contacting the stencil material positioned on a rotatable cylinder, includes a photo- multiplier for scanning the original document and providing an output signal the amplitude of which is proportional to the light reflected by the informa- tion thereon, a circuit including a square wave oscillator and wave shaping network which alters the square wave in relation to the burning character- istics 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 addi- tion 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.
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