Document feed tractor with height adjustable web support surface

Details Document feed tractor with height adjustable web support surface Document feed tractor with height adjustable web support surface

1991-04-22

1992-08-18

Stodola, Daniel P.

Advancing material of indeterminate length

Means to engage longitudinally spaced modifications in material

Pins on flexible belt or chain

4006161, 226 75, 226 86, 226170, B65H 2020

Patent

active

051391902

ABSTRACT:
A document feed tractor in which pins which drive the paper upon entry into perforations in margins of the paper along the edges thereof are connected to a belt on beams cantilever mounted thereto. A guide and support bar holds the beams and the pins down so that they travel along a linear path entering and leaving the perforations at opposite ends of the path. In order to drive the paper precisely, especially at high speeds where the belt and pins start and stop, without denting or ticking the paper and to maintain alignment of multi-part documents (without shingling), an adjustable shelf is located on the inside of the tractor so that the paper overlies the shelf. The elevation of the shelf with respect to the pins is selectively set in accordance with the thickness of the paper. The tractor can then be set so that the web is maintained at the center line or pitch line of the belt, thereby insuring precision feeding of the form even at high speeds with rapid accelerations and decelerations.

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