2008 Volume 16 Issue 3 Pages 93-100
The proper operating conditions for a spinning machine depend on the material to be spun (e.g., cotton or wool) and the required properties of the spun yarn. In many cases, the conditions are set by skilled experts proceeding by hunch and experience through a series of trial spinning operations. One of the conditions to be set is the spacing between the multiple rollers that feed the material out. If the appropriate spacing for each job could be estimated in advance, the large number of man-hours required for trial spinning could be reduced, and whether to readjust when changing lots could be decided reasonably and efficiently. In the usual MT method, how much a pattern represented by multiple items resembles the unit space data is evaluated by the Mahalanobis distance(MD). In this study, however, useful results were obtained by treating the quantity to be estimated, which was the optimal spacing between rollers, as one of the items and performing a true-value estimation, taking the value that minimized the Mahalanobis distance of the whole system as an estimate of the optimal roller spacing. The concepts and speciflc methodology applied when the MT method is utilized to estimate optimal adjusted values by the type of estimation described above wlll be reported, together with actual results.
