A weft detection sensor is provided that detects a passage of a weft to determine a passage timing of a weft circulating around a storage drum, and a weft insertion method includes setting in advance a reference value of a set position arrival timing in association with a set arrival position, regarding the set arrival position and the set position arrival timing at which a leading edge of the weft reaches the set arrival position, and determining an actual value of the set position arrival timing from the passage timing determined in weft insertion during weaving, comparing the actual value with the reference value, and in a case where a deviation occurs between the actual value and the reference value, determining a correction amount of a set value of a weft insertion related device based on the deviation so that the deviation decreases.

A multicolor water-jet loom has a first nozzle and a second nozzle, a water supply unit for supplying water to the first and second nozzles, length-measuring devices for storing wefts, locking pins for locking the wefts stored in the length-measuring devices, and grippers for gripping the wefts drawn out from the length-measuring devices. The water supply unit executes an operation to supply one of the first and second nozzles that has been paused for at least a predetermined period with preparatory water only for a preparatory water supply period, the preparatory water supply period including a point one pick before weft insertion is executed by the nozzle that has been paused for at least the predetermined period, in a state where the wefts are locked by the locking pins and gripped by the grippers.

A weft detection sensor is provided that detects a passage of a weft to determine a passage timing of a weft circulating around a storage drum, and a weft insertion method includes setting in advance a reference value of a set position arrival timing in association with a set arrival position, regarding the set arrival position and the set position arrival timing at which a leading edge of the weft reaches the set arrival position, and determining an actual value of the set position arrival timing from the passage timing determined in weft insertion during weaving, comparing the actual value with the reference value, and in a case where a deviation occurs between the actual value and the reference value, determining a correction amount of a set value of a weft insertion related device based on the deviation so that the deviation decreases.

A multicolor water-jet loom has a first nozzle and a second nozzle, a water supply unit for supplying water to the first and second nozzles, length-measuring devices for storing wefts, locking pins for locking the wefts stored in the length-measuring devices, and grippers for gripping the wefts drawn out from the length-measuring devices. The water supply unit executes an operation to supply one of the first and second nozzles that has been paused for at least a predetermined period with preparatory water only for a preparatory water supply period, the preparatory water supply period including a point one pick before weft insertion is executed by the nozzle that has been paused for at least the predetermined period, in a state where the wefts are locked by the locking pins and gripped by the grippers.

A weft yarn measuring and storing device of a loom includes a drive roller, a support shaft, a support lever is turnably mounted to the support shaft, a feed roller that is rotatably mounted to the support lever and pressed to be contacted against the drive roller by a spring force so that the feed roller is rotated by rotation of the drive roller to pinch a weft yarn therebetween for feeding, and a storing drum that takes up and stores the fed weft yarn. The weft yarn measuring and storing device further includes a friction resistance imparting portion that imparts the support lever a friction resistance against turning of the support lever.

A weft yarn measuring and storing device of a loom includes a drive roller, a support shaft, a support lever is turnably mounted to the support shaft, a feed roller that is rotatably mounted to the support lever and pressed to be contacted against the drive roller by a spring force so that the feed roller is rotated by rotation of the drive roller to pinch a weft yarn therebetween for feeding, and a storing drum that takes up and stores the fed weft yarn. The weft yarn measuring and storing device further includes a friction resistance imparting portion that imparts the support lever a friction resistance against turning of the support lever.