Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1994-07-11
1996-09-10
Czaja, Donald E.
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162263, 162252, 356375, 356385, 2424173, 226 20, D21F 1100, G01V 904
Patent
active
055542620
ABSTRACT:
An edge tracking apparatus for maintaining a continuous circulating papermaking fabric in an aligned position as it moves through a papermaking machine. The edge tracking apparatus includes a pivotally mounted guide roll and a laser scanner. The laser scanner, which produces a laser screen, is positioned relative to an edge of the papermaking fabric so that the edge bisects the laser screen. A controller is connected with the laser scanner. The controller acts to receive signals from the laser scanner in response to transverse movement of the edge of the papermaking fabric and to convert those signals into control signals which activate a drive in the steering apparatus. The drive shifts the longitudinal position of the guide roll causing it to steer the papermaking fabric back into its aligned position. A recording unit is also connected with the controller and is controlled to plot the position of the edge during operation of the papermaking machine.
REFERENCES:
patent: 3380637 (1968-04-01), Knapp
patent: 3570735 (1971-03-01), Kurz
patent: 4077579 (1978-03-01), Seleski et al.
patent: 4303189 (1989-12-01), Wiley et al.
patent: 5087313 (1992-02-01), Duecker
patent: 5117100 (1992-05-01), Yoshida et al.
"Industrial Applications of Laser" by John F. Ready, Academic Press 1978, Chapters 10 & 12.
"Using optical techniques to align paper machines" by Timothy Puntin, Tappi Journal, May 1987, pp. 179-181.
Czaja Donald E.
Flint Cort
Fortuna Jos'e A.
Jaudon Henry S.
Wangner Systems Corp.
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