Jacquard Repeat Length Priced as Card Time and Loom Hours
Pricing Jacquard repeat length requires balancing flat card preparation fees against loom hour rate increases caused by harness mass speed penalties.
Projectile Guide Tooth Clearance
Mechanical Gap
Projectile guide tooth clearance defines the precise spatial interval between the reciprocating steel gripper and the corresponding race of the shuttle during the high speed insertion phase of linen production. This projectile guide tooth clearance prevents contact between metallic components during the rapid acceleration of the carrier through the shed. The measurement applies specifically to the alignment of the grippers within the guide blocks of the reed.
Calibration occurs during the initial machine setup phase and remains documented within the loom maintenance log. A technician verifies the gap using a calibrated shim to ensure that the shuttle trajectory remains parallel to the slay surface. Excess distance leads to erratic flight patterns which damage the flax warp.
Insufficient space results in friction that generates excessive heat. Proper setting protects the integrity of the yarn surface by avoiding snagging or mechanical impact during the crosswise insertion. The gap maintains the structural health of the fabric edges throughout the weaving cycle.
Adjustment Protocol
Maintenance crews perform the manual calibration by loosening the locking bolts on the guide bank assembly to allow horizontal movement of the support rail. Small adjustments occur in increments of fraction of a millimeter to bring the gripper into the required alignment. Alignment takes place after the replacement of worn guide teeth or upon the installation of a new slay assembly.
The technician secures the mounting bolts once the gap meets the technical threshold established for the specific linen density. Precision here mitigates the risk of vibration that occurs when the projectile strikes the guide surface at high velocity. Consistent spacing supports the long term mechanical stability of the machine fleet.
Operational Variance
Quality control inspectors distinguish between mill standards for coarse household textiles and the stringent criteria required for fine garment linen. Fabric grades demand tighter tolerances for the guide system to avoid small loops or frayed fibres along the selvage. Internal plant standards override general manufacturer recommendations when the mill encounters high humidity conditions that cause the flax fibres to swell.
Individual looms require unique settings based on the historical wear patterns of the specific guide teeth. The clearance acts as the primary constraint on the maximum pick rate of the production line.