Dynamic Dynamic Load Modeling and Resonance Damping in Broad Harness Superstructures
Damping broad jacquard superstructure resonance stabilizes comber board deflection below half a millimeter, extending cord fatigue life and preserving shed clarity.
Harness Cords
Suspension Component
Specialized load-bearing cords linking jacquard machine hooks to individual heald eyes function as the primary motion-transfer element in pattern-controlled shed formation. Operating within jacquard linen sheds, harness cords transmit continuous reciprocating vertical motion against heavy warp tension. Each cord contains a synthetic core, typically braided polyester or aramid, encased in an extruded polyurethane coating to suppress friction against neighbouring cords and comber board perforations.
The component governs vertical heald lift during high-speed pick insertion.
Abrasion Behaviour
Mechanical wear develops along comber board contact points where cords flex during cyclic shedding operations. In Chinese linen mills producing figured table linen or apparel damask, harness cords endure severe lateral rubbing compounded by abrasive flax dust. Static electricity and fibre fly accumulate on cord surfaces, increasing resistance and degrading the smooth return motion powered by bottom lingoes or return springs.
Incomplete shed clearance produces mispicks and warp fuzzballs that inspectors record on grey-cloth inspection dockets. Preventative maintenance logs document regular cleaning with antistatic wax and continuous monitoring of cord diameters across the harness array.
Replacement Interval
Tension stability defines the service life before cord elongation produces misaligned heddle eyes. Progressive cord stretch shifts shedding planes, leaving individual warp ends trailing during rapier flight. When differential elongation exceeds three millimetres between adjacent pattern repeats, pattern distortion compromises buyer acceptance specifications under international fabric inspection protocols.
Harness cords dictate shedding precision across multi-shed linen fabric configurations.