Perforating device of stamp unit

摘要

A perforating device used by a stamp unit for perforating a desired character string pattern on a print face portion of the stamp unit which incorporates an ink impregnation member covered with heat sensitive stencil paper including a thermoplastic film. The perforating device includes: a thermal head having a plurality of heating elements selectively powered and heated to reach a first temperature to melt the thermoplastic film and perforate the heat sensitive stencil paper based on the character string pattern. A moving mechanism moves the thermal head and the print face portion relative to each other after the thermal head has performed the perforation. A head driving circuit powers the heating elements to reach a second temperature lower than the first temperature while the thermal head and the print face portion are being moved by the moving mechanism relative to each other.