Unalterable typewriting and printing through paper imprinting and perforation

摘要

The object of this invention is to create a system of impression and perforation of paper support while printing the character (see FIG. 1 where the letter "L" is taken as example). The edge of the letter (2) will imprint the character with ink while perforating the paper or similar with stings (1). The above described system is also suitable for needle printers (FIG. 2), where, on the head of the needles (6), stings (1') are placed with the purpose of perforating the paper support.