Perforating Apparatus for Adjusting to Wharfedale Printing Machines.

摘要

8729. Gronow, S. June 14. Perforating - apparatus.-Relates to apparatus for perforating paper sheets while on the take-off drum of a printing - machine, and of the kind in which n rotary slot perforating- knife works in conjunction with a metal band secured to the take-off drum. As shown, one or more bands fare secured in a circumferential recess e in the take-off drum d and are provided with a groove g to receive the edge of the perforating-knife a clamped between two plates m, one of which is formed with a boss o secured by a screw p to a shaft c. The knife is rotated by friction gear consisting of two india-rubber bands q provided on the plates m contacting with the drum d or hand f.