The stretching of the warp threads gets worse as the number of shafts increases. The extra complexity adds cost and reduces reliability as well as creating more work for the weaver's legs while treadling.
This helps reduce the tension on the lower warp threads to some degree but does not achieve the balance of a true countermarch design. Some Jack looms try to simulate a Countermarche shed by raising the loom backbeam during treadling. By only lifting the top threads, Jack or "Rising Shed" looms, as some like to call them, must lift the warp threads twice as high to get the same shed as the Weavebird! In comparison, the Jack mechanism used by conventional computerized looms creates a shed by raising some warp threads and leaving the rest untouched to create the base. This approach significantly reduces the degree of warp thread stretch when the weaver treadles the loom and reduces the force required to get a good shed to throw the shuttle through. The threads that are lifted form the top of the shed and the lowered threads create the shed base. The Weavebird loom design is a true Countermarch mechanism where every shaft moves either up or down with every pick to create the warp shed. Some of unique differences in the Weavebird design are detailed below. Rather than simply scale down an industrial loom or attempt to add computer-dobby support to a manual handloom design, the company has designed the Weavebird loom from the ground up specifically as a Computer-Dobby loom for the advanced handweaver or small production environment. The Leclerc Weavebird loom is a significant departure from conventional computer-dobby loom designs. Why Choose the Weavebird Computer-Dobby Weaving Loom?
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