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An electronic stencil cutter having a rotatable drum with an original subject sheet and a stencil sheet mounted side by side thereon. Scanning and stencil cutting heads are mounted on a common carriage for simultaneous movement along the original and stencil sheets. The original subject sheet is ret

An electronic stencil cutter having a rotatable drum with an original subject sheet and a stencil sheet mounted side by side thereon. Scanning and stencil cutting heads are mounted on a common carriage for simultaneous movement along the original and stencil sheets. The original subject sheet is retained in a holder consisting of a flexible, transparent sheet wrapped about the drum, one end of the retainer sheet being held releasably against the drum by a pressure-sensitive adhesive strip. The ends of the stencil sheet are held by an elongated clamp bar in a slot in the drum, the clamp bar being urged outwardly by springs and manually releasable by latch members at the ends of the bar. The stencil cutting head has a plastic stylus which is deflectible by a solenoid to press a wire electrode against the stencil sheet while cutting the stencil. The solenoid has a soft, felt-like nose which engages the stylus to dampen vibration of the electrode. The carriage is moved along the drum during the stencil cutting operation by one of a plurality of different speed drive motors as selected for the scanning speed required. Overrunning clutches associated with the non-selected motors free wheel so they do not back drag. A manually operable handle enables the carriage to be moved by hand, automatically overriding the motor drive connections. Movement of the cutting head along the drum is adjustable relative to movement of the scanning head to reproportion the image on the stencil sheet relative to that on the original subject sheet.

대표청구항 ▼

Apparatus for holding an original subject sheet or the like about the cylindrical surface of a drum on an electronic stencil cutter comprising: a backing sheet wrapped about the drum; a flexible, transparent retainer sheet wrapped about the drum exteriorly of the backing sheet and adapted temporaril

Apparatus for holding an original subject sheet or the like about the cylindrical surface of a drum on an electronic stencil cutter comprising: a backing sheet wrapped about the drum; a flexible, transparent retainer sheet wrapped about the drum exteriorly of the backing sheet and adapted temporarily to retain an original subject sheet on the backing sheet in a scannable position beneath the retainer sheet; said retainer sheet having a fixed end fastened to the surface of the drum; clamp means gripping said fixed end of said retainer sheet extending substantially parallel to the axis of the drum; fastening means attaching said clamp means to the drum, said fastening means including means enabling limited angular adjustment of said clamp means relative to the axis of the drum in response to tensioning the retainer sheet about the drum to enable wrinkle-free disposition of said retainer sheet about the drum; and said retainer sheet having a free end opposite said fixed end, a fastener strip attached to said free end of the retainer sheet and attachable to a fastener strip fixed to the drum, said fastener strips being provided on their facing surfaces with interengageable loops and hooks enabling the strips to cling to one another when pressed together and enabling them to be manually separable by pulling outwardly on the free end of the retainer sheet.