Tying apparatus, in particular having a plurality of mechanically operated knotting devices for tying the ends of pull cords, for example for plastic bags

摘要

The preferred use of the devices illustrated is a tying apparatus having a plurality of knotting devices for tying the ends of pull cords of different diameters for plastic bags. This purpose is served, inter alia, by devices for opening and closing the beak and for introducing, holding and releasing the pull cords from the beak or knotting mouth. In order also to be able to process thick cords from above 3.5 mm up to 6 mm reliably at a high operating speed or an operating cycle of more than 60 knots/minute, a striker (36) designed here as a lever is mounted closely adjacent to the beak (50), which striker is pivoted about the axis of rotation (35) by a pneumatic cylinder (39) and thus strikes the knotted pull cord out of the opened beak (50) at a high speed and with a high releasing force applied instantaneously, a clamping device (62) for the pull cord (8) being provided on the other side of the striker (36).