Rotary tab cutter
AssigneePackage Machinery Company
InventorsLawrence W. Schoppee, Alfred D'Antonio
Life of this patent
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Abstract
A continuously moving web passes over a fixed female die, which die is slotted to define a U-shaped cutting edge. A cylindrical punch rotates on an axis above the path of the web so that a cutting edge defined at the free end of the punch moves into the slot defined in the fixed die to cut a tab in the web. The length of the tab so cut can be varied by changing the relative speed of movement between the punch and that of the web, and the punch is mounted at an offset to its rotational axis. If such offset is positive, that is in the direction of rotation, the tab can be formed to "lead" the web. Providing the offset in the opposite or negative direction, the tab "trails" the web.
Claims10
A device for cutting a tab from a continuously moving web, said device comprising a fixed female die below the path of movement of the web and having a flat face which defines an outwardly open slot having a U-shaped cutting edge so oriented with respect to the web path that the legs of the U extend downstream in the direction of movement of the web, the base of the U being arcuate, a movable punch die of cylindrical configuration and defining at least a semi-circular cutting edge at one end, means rotatably supporting said punch die so that said semi-circular cutting edge moves downwardly into said slot and in said downstream direction to cooperate with said arcuate fixed cutting edge for shearing the web.
Dependencies are inferred from the claim text.