Patent ID: 7464646
Filing Date: 2008-12-16
Classification: B41F,B41P

Abstract:
1. A method for processing sheets of lenticular foil in a sheet-fed printing press, said printing press comprising a feeder table having feeding marks and a side stop, said sheets being fed on said feeder table in a running direction to plate cylinders, said lenticular foil comprising adjacently disposed lens strips that extend transversely to said running direction, the method comprising: aligning a front edge of a sheet of lenticular foil against said feeding marks and then a side edge of said sheet against said side stop on said feeder table; sensing a position of said front edge; sensing a position of a first contact line formed between two adjacently disposed lens strips; generating a first signal corresponding to said sensed position of said front edge; generating a second signal corresponding to said sensed position of said first contact line; comparing said second signal to said first signal to determine an adjusting value corresponding to a deviation of the actual position of said front edge from a nominal position determined by said first contact line; and adjusting a leading or trailing movement of said plate cylinders in accordance with said adjusting value, thereby aligning said plate cylinders with an actual position of said lens strips.