The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 1991
Filed:
Aug. 31, 1989
Yoshiyuki Tomita, Tokyo, JP;
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Abstract
In an apparatus for use in carrying out decoupling control of a T-die which has a pair of lip portions with a gap extended between the lip portions and with the lip portions divided into a plurality of zones individually driven by driving devices, respectively, a processing circuit individually controls the driving devices by the use of a predetermined decoupling control algorithm. The predetermined decoupling algorithm is given by a plurality of desired displacement vectors of the gap for the respective zones and a decoupling control matrix defined by inverse numbers of products of a command value/driving pressure converting matrix (Kp) and a driving pressure/displacement converting matrix (K.alpha.). Alternatively, the decoupling control matrix is repeatedly modified with time to decrease a difference between the desired gap displacement (.DELTA.y) and the measured gap displacement (.DELTA.y.sub.m). Each command voltage value vector .DELTA.u of the command value/driving pressure converting matrix is compensated by the use of a figurative inherent error of the lip structure.