Device for aligning sheets with plural drive roller groups on a

Details Device for aligning sheets with plural drive roller groups on a Device for aligning sheets with plural drive roller groups on a

1990-11-27

1992-08-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

271227, G01N 2186

Patent

active

051401665

ABSTRACT:
In a sheet feeding device, the local feed of the sheet is measured in the vicinity of respective drive rollers by means of respective sensors for the purpose of aligning rectangular sheets of a preselected set. On the basis of signals from the light sensors, a control device determines an optimum pair of rollers for aligning the sheet. The control device compares the signals of the two associated sensors and adjusts the local feed of the sheet in such a way that the two sensors establish the same local feed, before the sheet leaves one of the selected rollers.

REFERENCES:
patent: 3603446 (1971-09-01), Maxey et al.
patent: 4438917 (1984-03-01), Janssen et al.
patent: 4855607 (1989-08-01), Eckl
patent: 4987448 (1991-01-01), Chikama

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