Advancing material of indeterminate length – Means to engage longitudinally spaced modifications in material – Pins on flexible belt or chain
Patent
1990-03-07
1992-05-05
Stodola, Daniel P.
Advancing material of indeterminate length
Means to engage longitudinally spaced modifications in material
Pins on flexible belt or chain
4006161, 400608, 226 82, B65H 2020
Patent
active
051100258
ABSTRACT:
A cover is disclosed for a paper feed tractor having first and second side frames, a paper receiving plate extending perpendicularly from the second side frame and having a hole formed therein, and a paper exhaustion detector mounted to the second side frame. The paper exhaust detector of the paper feed tractor includes a microswitch with an upwardly biased plunger, and an actuator pressed upwardly by the plunger and pivotable between a first position in which it detects the presence of paper and a second position in which it detects the absence of paper. The cover of the present invention includes a plate, and elongated ribs projecting downwardly from the bottom surface of the plate on opposing sides of an elongated slot formed through the plate. The cover is characterized in that rib type elongated paper contactors project downwardly from the bottom surface of the plate at a position in which, when the plate is positioned directly above the paper receiving plate, the contactors will be adjacent the hole formed through the paper receiving plate. In this manner, when paper is fed between the paper receiving plate and the plate of the cover, the portion of the paper which is pressed upwardly by a contact portion of the actuator of the paper exhaustion detector is supported by the paper contactors so that the paper is not significantly deformed upwardly. In this manner, errors in detecting whether the paper is present or is exhausted are avoided.
REFERENCES:
patent: 4129239 (1978-12-01), Hubbard
patent: 4194660 (1980-03-01), Seitz
patent: 4214691 (1980-07-01), Van Namen
patent: 4359179 (1982-11-01), Waiss
patent: 4643603 (1987-02-01), Hauslaib
patent: 4706861 (1987-11-01), Kerivan
patent: 4735352 (1988-04-01), Ueno et al.
Bowen Paul Thomas
Stodola Daniel P.
Tokai Kogyo Kabushiki Kaisha
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