REGISTRATION SYSTEM FOR PHASING SIMULTANEOUSLY ADVANCING WEBS OF MATERIAL HAVING VARIABLE PITCH LENGTHS

摘要

Disclosed is a registration system for phasing simultaneously advancing webs of material (30, 40) having variable pitch lengths comprising means for feeding a continuous target web (40) containing consecutively spaced target objects (42) along a path at a first velocity (V), the target web having a target web pitch length (L+P) between consecutive target objects; means for feeding a continuous controlled web (30) of material preprinted with consecutively spaced preprinted objects (22) along a path at a second velocit (Vc), the preprinted web having a controlled web pitch length (Lpp) between consecutive preprinted objects; means for adjusting the controlled web pitch length such that the controlled web pitch length is approximately equal to the taget web pitch length; detection means (34) for detecting a preselected feature of the controlled web; means for generating an error signal based upon the detection of the preselected feature of the controlled web; and means for adjusting the second velocity such that the preprinted objects are shifted toward the target objects on the target web.