Cord Resistance
Mechanical tension within the loom interface accounts for harness cord friction. This interaction occurs during the shedding motion when cords pass through metal eyes or guide holes. Higher contact pressure between the cord material and the stationary hardware components increases the resistance force.
Excess heat generation results from this drag, potentially damaging synthetic fibres or causing uneven tension across the warp. Accurate monitoring of this force ensures consistency in fabric density across the entire width of the loom.
Calibration Procedure
Engineers measure harness cord friction by applying a controlled horizontal load against the cord while monitoring the displacement response. Technicians use a spring balance attached to the cord segment to record peak drag values during a full shed cycle. These measurements occur at specific intervals during machine operation to account for wear on the eyelets or cord coatings.
Baseline data requires verification against the machine manufacturer specifications for tension tolerances. Deviations from these values signal the need for lubrication or the replacement of worn guide components.
Process Impact
High levels of drag disrupt the shedding timing of the loom. Improper timing leads to uneven tension distribution on the warp ends, which produces visible streaks in the finished linen cloth. Persistent drag wears through protective coatings on high-tenacity cords, which weakens the integrity of the harness system.
Controlled cord movement allows the loom to maintain consistent weave geometry throughout long production runs. Stable harness performance represents the primary limit on operating speed for modern high-speed looms.
