Method to execute a pause function during the printing operation given an ink printing apparatus

摘要

In a method to execute a pause in an ink printing system printing operation in which a printing substrate web is printed with print bars having print heads, with aid of a take-up roller moving the printing substrate web at printing speed past the print bars in a transfer printing zone in order to generate print images. Upon triggering the pause, a strain state of the printing substrate web is measured at a beginning of the pause and stored as a desired strain state. During the pause, the strain state of the printing substrate web is measured as a real strain state at selectable points in time, and the real strain state is compared with desired strain state. Given a deviation of the real strain state from the desired strain state, at the selectable points in time the take-up roller is controlled so that the strain state of the printing substrate web assumes the desired strain state at the beginning of the pause. After an end of the pause, the printing substrate web is transported with the take-up roller at the printing speed again.

主权项

1. A method to execute a pause in printing operation of an ink printing system with at least one printing apparatus in which a printing substrate web is printed with a printing unit with print bars having print heads, comprising the steps of:
with aid of a take-up roller moving the printing substrate web at printing speed past the print bars in a transfer printing zone in the printing operation in order to generate print images on said printing substrate web; upon triggering the pause, a strain state of the printing substrate web at a beginning of the pause is measured and stored as a desired strain state; during the pause, measuring the strain state of the printing substrate web as a real strain state at selectable points in time, and comparing the real strain state with the desired strain state; given a deviation of the real strain state from the desired strain state at the selectable points in time, controlling the take-up roller so that the strain state of the printing substrate web assumes the desired strain state at said beginning of the pause; and after an end of the pause, transporting the printing substrate web with the take-up roller at said printing speed again.