The Shed-Shape Characteristic

Abstract

Movements of the front shed boundary impose constraints on filling-insertion tim ings. These movements, which entail changes in shed shape, are determined by sley drive and shedding mechanism characteristics and by the shed-change timing. Shed shape can be specified by two angles whose variations with timing define a characteristic that depicts the form of the whole sequence of shed shapes occurring during the loom cycle. Differences between such sequences of shed shapes are shown particularly clearly by this characteristic. The main forms of the shed-shape sequence, showing the effects of both sley and shedding dwells and of shed-change timings, are illustrated. Examples of shed-shape-dependent constraints on timings are considered in conjunction with relevant shed-shape characteristics, and their implications are discussed.