Stencil making device having means for controlling dot perforati

Details Stencil making device having means for controlling dot perforati Stencil making device having means for controlling dot perforati

1992-05-27

1993-10-12

Burr, Edgar S.

Printing

Stenciling

Stencils

101129, B41C 114

Patent

active

052515672

ABSTRACT:
A stencil making device capable of controlling numbers of perforations formed by a thermal head. A perforated image is formed by the thermal head in a heat sensitive stencil sheet. An ink in an ink pad passes through the perforated image for providing an inked image on a print sheet. If perforations are densely formed, excessive ink may pass through the perforations. Therefore, the numbers of the perforations are controlled or reduced at a thick character portion. A control unit is provided for changing ON dot area to the OFF dot area of the thermal head if the ON dot area are densely provided.

REFERENCES:
patent: 2499472 (1950-03-01), Dyal
patent: 3541956 (1970-11-01), Falchero
patent: 3799053 (1974-03-01), Rabelow
patent: 4444808 (1984-04-01), Kikuchi et al.
patent: 4957378 (1990-09-01), Shima

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