Paper making and fiber liberation – Apparatus – Automatic control
Patent
1989-03-13
1990-04-10
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Automatic control
162262, 162344, D21F 106
Patent
active
049157892
ABSTRACT:
For uniform and regular adjustment of a diaphragm blade within the elastic deformability thereof, the diaphragm blade provided at the slice opening of a headbox of a papermaking machine is movable by means of adjusting elements driveable by adjustment motors. The adjusting elements are arranged in an appropriate spaced relationship substantially parallel to the diaphragm blade and coupled therewith in order to apply a force upon the diaphragm blade at connecting locations thereof. At each of the adjustment motors there can be individually set or adjusted during an adjusting operation prior to starting the adjustment motors the momentarily desired thrust speed and the momentarily desired thrust distance or travel for the respective adjusting element. All adjustment motors are simultaneously started and simultaneously stopped subsequent to reaching the desired position or location of the diaphragm blade. Electric step motors operating in a fixed cycle are particularly suitable for simultaneously starting and simultaneously stopping the adjusting operation. The apparatus and the therewith performable adjusting operation are controllable and programmable by known electronic means.
REFERENCES:
patent: 3463701 (1969-08-01), Curtis
patent: 4726883 (1988-02-01), Schroeder
patent: 4741686 (1988-05-01), Cazzani et al.
German Technical Journal "Das Papier", 35th year, No. 10, 1981, pp. 445 through 452: Technical paper of Heiner Kiessling entitled "Technical Progress Headbox--Anti--Deflection Control and Lip Plate Loading".
"New System Control CMD Basis Weight Profile Automatically", Paper Trade Journal, pp. 34-36, Nov. 1971.
Ficklscherer Peter
Munch Rudolf
Hastings Karen M.
Kleeman Werner W.
Sulzer-Escher Wyss GmbH
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