CLOSED LOOP STALLED ROLL REGISTRATION

摘要

This invention uses a paper registration device with a paper transport and a stalled roll together with an upstream and downstream CIS to enable paper skew measurements. The upstream CIS is positioned on a paper sheet transport between a beginning pre-registration nip and a buckle control sensor. A second downstream CIS is aligned with the first upstream CIS to provide skew measurement on the same side of a paper sheet. An advantage of this registration device is that it simultaneously corrects registration in a process direction, a cross process direction and corrects skew angle.