Shed Timing and Synchronisation Control
topic
Loom shed timing control coordinates the angular position of shed crossover, full shed opening, and shed closure in precise relationship to the weft insertion and beat-up events encoded as angular positions of the main shaft encoder, with programmable shed timing enabling optimisation of the timing balance between early shedding for longer insertion dwell time and late shedding for reduced warp tension at crossover, and with synchronisation precision of plus or minus 0.5 degrees crank angle being the specification for modern electronic timing systems.
Role
Governs one of the most critical performance parameters in weaving by controlling the timing relationship between shed formation and weft insertion that determines the window available for reliable insertion, with the ability to programme and optimise shed timing electronically being a major advantage of modern loom control over the fixed cam timing of earlier mechanical looms, enabling the timing optimisation that reduces warp breaks and improves insertion reliability across different yarn and fabric specifications.