To provide a weft length measuring and reserving system designed to prevent a weft from wrapping or nozzle skipping that may occur in the slight movement or reverse action of a loom.

This weft length measuring and reserving system includes an avoiding means which functions to set the system at a halt while maintaining one or more driven members so as to be operable to lift the halt upon being driven by the main shaft of the loom at least prior to subjecting the loom to slight movement or reverse action.