Web or sheet-fed apparatus having high-speed mechanism for simultaneous X,Y and theta registration
Web processing apparatus ( 30, 300 ) is provided for high speed, extremely accurate die cutting or lamination operations. Processing station ( 32, 300 ) includes a Vacuum hold down plate ( 32, 308 ) which receives and holds an image bearing incremental segment of the web. In feed and out feed tension on the web is released while a segment of the web is held by the hold down plate. The hold down plate with a segment of the web thereon is selectively shifted about X, Y and θ axis as required to bring the image on the web segment into alignment with a web processing component at the processing station.
1. Apparatus for processing segments of a continuous flexible web comprising:
a processing station including web processing components for carrying out an operation upon a segment of the web after the segment is initially fed to the processing station;
a web feeder assembly for successively feeding a stretch of the web while under tension to said processing station for initial placement of said at least one segment of the web at the station, said mechanism being operable to intermittently release tension on the stretch of the web while said at least one segment thereof is at the processing station;
a holder at the processing station for holding each successive segment of the web after the segment is positioned in said initial placement thereof at the processing station and during at least a part of the time tension is released on the stretch of the web,
said holder being movable relative to said web feeder assembly while said holder continues to hold said at least one segment of the web at the processing station to cause the held segment to move relative to and while remaining a part of adjacent portions of the web during release of tension on said stretch of the web; and
a mechanism operably coupled to said holder for selectively shifting the holder along an X axis direction of feed of the stretch of the web to the processing station, in a Y direction transverse of the X direction of feed of said stretch of the web, and about a θ axis of rotation perpendicular to said X and Y axis directions while said at least one segment of the web is held by the holder at said processing station,
said mechanism including adjustment control structure operably connected to the holder for shifting the holder in motion directions along said X axis, along said Y axis, and for rotation about said θ axis, wherein the adjustment control structure is operable to move the holder in any one of the motion directions, or simultaneous combinations thereof as required to obtain accurate alignment of the segment of the web with the processing components of said processing station while tension on the stretch of the web is released.
2. The apparatus of claim 1 wherein said holder includes a shiftable vacuum plate at the web processing station, means for applying a vacuum to the plate to hold a segment of the web at the processing station, said adjustment control structure being operable to move the vacuum plate to selectively adjust the position of the plate while holding said segment of the web thereon in said X axis direction, said Y axis direction and said θ axis direction.