Jacquard Harness Tie Configurations and Structural Repeat Fundamentals
Jacquard repeat limits scale with hook count and warp density, where systematic harness casting-out maintains uniform cord pull angles across the comber board.
Neckboard
Support Frame
Perforated guide plate positioned directly beneath the jacquard head holds the harness cords in vertical alignment as they descend toward the comber board. This mechanical component, known as the neckboard, ensures that each lift wire remains separated from its neighbors to prevent friction during weaving. Technicians inspect this board during assembly to ensure the guide holes are perfectly smooth and clean.
Alignment Function
Maintaining the straight descent of the harness cords is necessary to prevent knotting and to ensure precise pattern transfer to the woven cloth. The neckboard distributes the cord cluster across the width of the machine, acting as the primary organizing grid below the hooks. In linen weaving mills, where heavy starch sizing or flax dust can accumulate on the machinery, the board must be kept free of debris to prevent cords from sticking or wearing prematurely.
This component is constructed from hardwood or hard synthetic materials to withstand the continuous abrasion of the cords during loom operation.
Durability Aspect
Wear on the guide holes causes uneven cord heights, which results in a messy shed and weaving defects in the linen. When holes become enlarged or rough, the neckboard must be replaced or refinished to avoid damage to the harness assembly. Maintenance teams log these inspections during scheduled loom overhauls to prevent production downtime during long weave runs.