Importance

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Abstract

A stack of sheets or blanks for feeding one by one from the bottom of the stack by a feeding mechanism is supported for high speed feeding to subsequent stations. A feed cylinder rotatably supported beneath the leading edge of the stack includes a suction device. An intermediate portion of the blank leading edge is drawn by the suction device downwardly toward an opening in the periphery of the feed cylinder. Continued rotation of the feed cylinder further bends the blank. For blanks of large size and having a leading edge with an irregular contour the blank leading edge intermediate portion extends forwardly from edge lateral portions. Positioned in spaced relation along the interior of the feed cylinder are a plurality of air manifolds having outlets directed at selected angles upon the lateral portions of the blank leading edge. The manifolds are connected to a source of pressurized air which is directed in a sweeping motion upon the blank leading edge lateral portions upon rotation of the feed cylinder. The pressurized air flow sequentially bends the blank leading edge lateral portions downwardly away from the stack as the feed cylinder rotates to move the compressed air outlets into closer proximity to the edge lateral portions. A rotating sweep of compressed air downwardly bends the blank lateral edge portions to positively control the movement of the blank to separate completely from the stack before the blank is removed to assure jam-free feeding at high speed.

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First Claim