| 摘要 |
<p>Disclosed is a registration system for phasing simultaneously advancing webs of material having variable pitch lengths comprising (a) means for feeding a continuous target web containing consecutively spaced target objects along a path at a first velocity, the target web having a target web pitch length between consecutive target objects; (b) means for feeding a continuous controlled web of material preprinted with consecutively spaced preprinted objects along a path at a second velocity, the preprinted web having a controlled web pitch length between consecutive preprinted objects; (c) means for adjusting the controlled web pitch length such that the controlled web pitch length is approximately equal to the target web pitch length; (d) detection means for detecting a preselected feature of the controlled web; (e) means for generating an error signal based upon the detection of the preselected feature of the controlled web; and (f) means for adjusting the second velocity such that the preprinted objects are shifted toward the target objects on the target web.</p> |
