DEVICE FOR FORMING SLITS.

摘要

A slit forming device comprising a rotary cutter (1), a receiver roll (2) and presser bump portions (14). The rotary cutter (1) abuts against a web member (3), to thereby form slits. The receiver roll (2) includes bank portions (22) for supporting the web member (3) pressed by the rotary cutter (1) and grooves (21) for receiving blades of the rotary cutter, which penetrate through the web member. The presser bump portions (14) press the web member (3) at opposite side portions thereof to restrict undesirable movement thereof in the lateral or longitudinal direction. By use of this device, satisfactory slits with a fewer defects are formed in the web member (3).