| 摘要 |
<p>A weft-bar (set mark) prevention system for a loom which can prevent a weft-bar caused when the loom is immediately restarted, after the loom has been stopped due to weft- or warp-thread cut (i.e., breakage of a weft or warp thread). When the loom is restarted from the closed-shed state, a greater additional warp tension is applied to the warp threads; when the loom is started from the open-shed state, a smaller additional warp tension is applied to the warp threads. After one or two cycles of the loom motion, the above-mentioned additional warp tensions are not applied, because the main motor is in a stable condition. The system according to the present invention comprises an optical loom-starting angle sensor for detecting whether the loom is started from the closed-shed or open-shed, a counter for determining at least one initial cycle during which warp tension is controlled, air cylinder to push the easing lever in the direction to increase warp tension.</p> |
