Jacquard Harness Setup and Repeat Width Arithmetic Basics
Jacquard harness setup dictates woven repeat limits by mathematically mapping electronic hook capacity and comber board pitch against reed density and yarn crimp.
Mail Eye Height
Vertical Gauge
Vertical positioning along the loom frame determines mail eye height during warp shedding in Chinese linen mills. Technicians adjust this measurement before spinning operations transition to weaving on jacquard looms. Flax yarns pass through individual heddle eyes positioned at precise vertical coordinates above the shuttle race.
Operators record final measurements inside the mill production ledger alongside batch numbers and yarn counts. A standard fibre grade describes raw flax strength and moisture content before spinning begins. Fabric grade evaluates finished linen density and surface defects after wet finishing.
Mills maintain internal limits for daily operational control while buyer contracts specify stricter acceptance thresholds.
Frame Tension
Shedding geometry depends entirely on vertical distance between the harness shafts and the lower warp sheet. Correct positioning prevents excessive friction on fragile flax fibers during high speed shuttle passages. Slack warp threads cause uneven cloth construction while overtightened strands break prematurely on the loom.
Weavers verify vertical settings whenever ambient humidity shifts inside the production floor because moisture alters yarn elasticity. Inspectors measure vertical clearance using metal gauges resting directly upon the loom frame. Production supervisors audit these records weekly to maintain uniform cloth quality across export batches.
Shedding Clearance
Vertical positioning tolerances govern warp separation during shuttle transit. Proper clearance ensures unbroken weft insertion without abrading adjacent warp threads. Excess vertical travel wastes mechanical energy and strains harness cords unnecessarily.
Mill engineers calculate allowable variance according to yarn twist density and reed count. Export documentation records final inspection results for international buyers. Finished linen performance relies directly on initial vertical accuracy set during loom preparation.