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US 4,399,725 AGranted
Method and apparatus for cutting plastic materials
AssigneeThe Goodyear Tire & Rubber Company
InventorErnest A. Milan
Life of this patent
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AssigneeThe Goodyear Tire & Rubber Company
InventorErnest A. Milan
Estimating the term…
A strip of plastic material is cut by clamping the strip and then moving a cutting blade from a retracted position to a first position in cutting engagement with the strip. Simultaneously a supporting blade in overlapping relation with the cutting blade is moved to the first position for lifting the strip. The movement of the supporting blade stops at the first position and the cutting blade movement is continued through the strip. The cutting surface of the cutting blade is recessed adjacent the cutting edge so that upon movement of the cutting blade the contact with the strip is minimized to prevent the formation of burrs on the severed ends of the strip. After the strip is severed the cutting blade is retracted to the first position. From the first position, the cutting blade and supporting blade are moved to a fully retracted position and the strip unclamped so that the severed portion of the strip can be removed and the remaining portion of the strip moved into position for the next cut.
Apparatus for cutting a strip of plastic material comprising a supporting structure containing a passage having a supporting surface for said strip, a knife assembly positioned in said structure under said passage, a shearing block mounted on said structure at the opposite side of said passage, a clamping member positioned in said structure adjacent said knife assembly and movable toward said passage into engagement with said strip for pressing the strip against said shearing block, said knife assembly including a cutting blade and a supporting blade, said supporting blade being in overlapping relation with said cutting blade, means for moving said cutting blade and said supporting blade an initial amount toward said shearing block from a retracted position to a first position, means to move said cutting blade beyond said supporting blade into shearing engagement with said shearing block and means to retract said cutting blade and said supporting blade to said retracted position.
A method of cutting a strip of plastic material having top and bottom sides comprising the steps of
Dependencies are inferred from the claim text.