Impact cutoff
AssigneeThe National Machinery Company
InventorAaron T. Hall
Life of this patent
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Abstract
An impact cutoff device for a progressive high speed cold former having a low mass rigid cutter carriage, a torsion spring for carriage return, and an articulated, oil lubricated and dampened carriage drive block on a pivoting drive lever serving to reduce impact induced vibration otherwise leading to fatigue failure and wear of the various cutter parts and consequent loss of cutoff accuracy and quality.
Claims6
An impact cutter assembly for shearing blanks from wire stock comprising stationary and movable cutter blades, the movable cutter blade being mounted in a carriage that reciprocates along a line between a wire receiving position where the blades are aligned and a delivery position where the blades are displaced from one another, a striker block having a flat striker surface, the carriage having a flat carriage surface, said carriage surface being perpendicular to the line of carriage reciprocation, a driver for moving the striker surface towards the carriage surface at a velocity of at least 1.5 meters per second, the striker surface being supported in parallel relation to the carriage surface when in contact with the carriage surface, and a lubrication oil circuit for delivering lubrication oil directly to an open space between the flat striker and flat carriage surfaces whereby an impact between the flat striker surface and the flat carriage surface is damped by the presence of a film of the lubricating oil.
Dependencies are inferred from the claim text.