Apparatus for positioning a web

摘要

An apparatus for use with a web (W) having printed thereon bar codes (B) each identifying a container manufacturer, product, etc. and arranged longitudinally of the web at a spacing corresponding to one container, for positioning each of the bar codes in a specified position (23). The positioning apparatus comprises a feeder (16) drivable by a main shaft (22) for transporting the web via the specified position, a detector for detecting (24) the angle of rotation of the main shaft upon the bar code moving past the specified position, and a calculating unit (32-35) for calculating the deviation of the angle detected by the detector from a predetermined reference angle and determining as an amount of transport by the feeder a set value corresponding to the calculated deviation based on a predetermined relationship between deviations and set values. <IMAGE>