This machine assembles cellular phone windows onto self adhesive gaskets and applies a protective label.  The gaskets are supplied 5 up on sheets of backing paper and are loaded by the operator onto fixtures on an over and under servo driven indexing conveyor. The windows are supplied in vacuum formed trays and are loaded by the operator into an automatic tray progression system. Empty trays are discharged into a pile at the end of the machine. The indexing conveyor makes 4 short indexes between gaskets and then 1 long index to get to the next sheet. The windows are loaded onto the gaskets by a 4 axis servo controlled parts placer.  Even though the accuracy of the indexing conveyor is pretty good, the position of the gaskets on the paper and the position of the windows in the tray is not repeatable enough to achieve the window placement accuracy required.