Electronic Warp Let-Off and Tension Control
topic
Electronic let-off systems measure warp tension through load cells on the back rest or tension roller and control a servo-driven let-off gear motor that releases warp from the beam at the rate required to maintain programmed constant warp tension throughout the beam depletion from full to empty, compensating for the decreasing beam radius and beam mass that would otherwise cause warp tension increase as the beam depletes.
Role
Maintains constant warp tension throughout beam weaving that is prerequisite for uniform fabric pick density, consistent shed geometry, and stable weaving efficiency, with electronic let-off eliminating the tension drift from beam radius change that mechanical let-off systems require periodic manual adjustment to correct, preventing the warp tension variation that causes fabric defects including pick variation bands and increased warp break rate.