Patent ID: 7963220

Claim:
A stencil printing apparatus having a platemaking device that creates perforations in a stencil base sheet via platemaking means, a rotationally-driven cylindrical plate cylinder on an outer circumferential surface of which a stencil base sheet made by platemaking is mounted, a sheet-feed device for separately feeding out a printing sheet, a printing-pressure device for pressing a fed printing sheet onto the outer circumferential surface of the plate cylinder, and a sheet discharge device for conveying and discharging a printed sheet, the stencil printing apparatus, comprising: a sheet-type detecting unit which automatically detects whether a printing sheet set in the sheet-feed device is a coated sheet or a non-coated sheet; base-sheet type detection means for detecting a type of the stencil base sheet set in the platemaking device; and a control device for, when a sheet type detected via the sheet-type detecting unit is a coated sheet, executing a control for judging whether or not a type of stencil base sheet set in the platemaking device is for coated sheet printing on the basis of a detected signal from the sheet-type detecting unit, and permitting platemaking start when the stencil base sheet type is for coated sheet printing and issuing a warning without permitting platemaking start when the stencil base sheet type is for non-coated sheet printing, wherein the sheet-type detecting unit detects whether the printing sheet set in the sheet-feed device is a coated sheet or a non-coated sheet based on an optical reflectance of the printing sheet, and wherein a film thickness of the coated sheet as a printing sheet is larger than a film thickness of the non-coated sheet, and an adhesive of the coated sheet is stronger than an adhesive of the non-coated sheet.