THE EFFECTS OF SHED GEOMETRY AND TIMING ON BEAT-UP PEAK TENSIONS ON SHUTTLELESS WEAVING MACHINE

Measurement of Beat-up force (BUF) on looms have been restricted to shuttle loom. This has not been possible for shuttleless loom yet, because Of structural design of its reed. Experiments were carried Out on a shuttleless projectile weaving machine fixed with two calibrated warp tension gauges. An account is given of the study of the effects of shed geometry and timing on beat-up excess tension (substituted for beat-up force) on a projectile shuttleless loom. Experimental results show that beat-up excess tension on this weaving machine varies with loom settings such as shed timing and shed geometry that determine basic warp tensions and the ratio of tensions in the warp sheets in a similar way to variations in beat-up force on slow shuttle loom. The effects of back rail freely oscillating against its springs or blocked are also discussed. The warp tension traces were described in relation to the mechanical functions Of the weaving machine. The measurement of beat-up excess tension as proposed substituted accurately for BUF on shuttleless weaving machine