Machine for forming sealing bags with zipper strips that are supplied transverse to process path

摘要

The machine has a frame (2) with outriggers (3) supporting transverse axle (5) that carries a roll (4) of the foil web (6). The web is guided about a number of balancer rolls (7') and rolls (7). The web then passes an encoder (15), over a zipper strip applicator (11), and under a pre-seal unit (12) where the zipper strip is secured to the web. A web edge follower (18) detects the position of the web edge. A photo-cell (14) detects the tracer sports on the web. A web length manipulator (13) is provided with a bearing roller (7a) mounted in the slots (70) and can be moved by means of a spindle motor (71) to take up a pre-determined position. The web further passes another encoder (16) and tracer spot photo-cell and arrives at a form shoulder (8) where it is transformed into a tubular shape and filled.