Advancing material of indeterminate length – Means to engage longitudinally spaced modifications in material – Pins on flexible belt or chain
Patent
1989-03-24
1990-09-11
Stodola, Daniel P.
Advancing material of indeterminate length
Means to engage longitudinally spaced modifications in material
Pins on flexible belt or chain
4006161, B65H 2020
Patent
active
049555200
ABSTRACT:
An improved lid mechanism for a web feed devices such as tractors for feeding perforated paper webs in printers, copiers and the like, wherein pins on which the lid is pivotally mounted for movement between open and closed position are unloaded (do not have any force or bias applied thereto) when the lid is in its open and closed position. The lid, when closed, covers the paper and is then spaced by a gap from the surface of a frame along which the paper is fed by a pin drive such as a belt having pins which extend into perforations of the paper. A depending leg of the lid has a block with surfaces disposed at an angled to each other. These surfaces extend from a corner of the block. One of these surfaces is preferably perpendicular to the surface of the lid which defines the gap. The other of these surfaces defines the position of the lid in its open position. These surfaces bear against the outer wall of the side plate of the frame of the device (the tractor) and are biased thereagainst by a flat spring mounted on the side plate. This spring bears against surfaces of the block opposite to the surfaces which bear against the outer side wall. The location of the lower surface of the lid and the size of the gap is defined by a pin and slot hinge arrangement. The slot is longer than the stroke of the pin which is executed as the lid moves between its open and closed position. Accordingly in both the open and closed position the block is under compression and the pin is unloaded. The lid may be molded and is an integral body of plastic.
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Bowen Paul Thomas
Lukacher Martin
Precision Handling Devices Inc.
Stodola Daniel P.
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