POSTPRESS: Judging while jogging
The best time to make a quality check of printed sheets is either immediately before or during jogging. At this stage, crumpled sheets can easily be sorted out, and the appearance of the remaining sheets can be examined. The sheets also can be checked for even positioning by looking at the cutting marks printed on them.
By turning the sheets over while fanning them out, the operator can also detect sheets that have been positioned in the press with their sides incorrectly aligned. Sheets displaying dirty edges because of misalignment can then be removed from the pile.
Using a stacklift that can be adjusted to the proper working height helps to assure accuracy in this essential quality check.