Markless registration system for labels in labelling machines

摘要

Registration systems for labels in labelling machines, in order to provide the correct positioning of a label on an object, namely on a container are provided. In particular, the registration system of the invention is applicable on a labelling machine of the type that uses a label reel from which single labels are cut and are applied on a container.

主权项

1. A method for controlling labelling in labelling machines comprising the sequential steps of:
in a first step, determining which part of the printed matter of a test label in a label film has a maximum measure of signal-to-noise ratio or contrast to constitute a reference region; in a second step, identifying a processing region of a subsequent processing label of the label film; in a third step, comparing corresponding points of said processing region with said reference region and computing the length of the processing label; in a fourth step, reading each processing region of each subsequent processing label, comparing it with said reference region, and computing the length of the processing label, and in a fifth step, controlling an operation of the labelling machine as a function of the label length computed in the previous step.