Advancing material of indeterminate length – With material-responsive control means – To position material laterally
Patent
1980-10-14
1982-05-25
McCarthy, Edward J.
Advancing material of indeterminate length
With material-responsive control means
To position material laterally
242 571, B65H 2526
Patent
active
043312748
ABSTRACT:
An elongated sheet transport and guidance system including a drive roller mounted for rotation on a frame and adapted to engage and frictionally drive the sheet along its longitudinal axis and a pinch roller engaging the drive roller and mounted for rotation on an axis parallel thereto, the pinch and drive rollers being arranged to straddle and exert a pressure on that portion of the sheet passing therebetween. Also included in the system is a first means for inducing a first pressure level between the pinch and drive rollers in a region adjacent one longitudinal edge of the traveling sheet and a second means for inducing a second pressure level between the pinch and drive rollers in a region adjacent the opposite longitudinal edge of the sheet. In response to the output of a sensing means that senses lateral displacement of the traveling sheet, a control mechanism varies the difference between the first and second pressure levels. The control mechanism causes the first pressure level to increase relative to the second pressure level in response to lateral displacement of the sheet in one sense and causes the second pressure level to increase relative to the first pressure level in response to lateral displacement of the sheet in the opposite sense.
REFERENCES:
patent: 1596954 (1926-08-01), Tuttle
patent: 3323699 (1967-06-01), Bricker
patent: 3323740 (1967-06-01), Blessing
patent: 3971496 (1976-07-01), Karsh
patent: 4007865 (1977-02-01), Crandall
patent: 4054251 (1977-10-01), Henderson
Cohen Arnold H.
Halewijn Harry J.
Blair Homer O.
Glanzman Gerald H.
Itek Corporation
McCarthy Edward J.
Nathans Robert L.
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