WEFT FEEDER FOR WEAVING MACHINES HAVING ADJUSTABLE DIAMETER DRUM

A weft accumulator with yarn roll separation for a weaving machine, comprising: an adjustable diameter drum comprising a fixed sector; moving sectors arranged at each of the fixed sectors and causingperiodic displacement of a weft yarn roll wound on the drum; the adjusting device is used for adjusting the radial positions of the fixed fan-shaped piece and the movable fan-shaped piece; and a locking device which locks the fixed fan-shaped member and the movable fan-shaped member at any desired position. The weft accumulator includes a kinematic system that interconnects the locking means of the stationary sector and the locking means of the moving sector, angularly rotates in any plane through the axis of the shaft of the weft accumulator, and is torsional and axially rigid about and alongthe axis. And a locking device for fixing the fan-shaped piece is connected to the first locking/unlocking servo controller. And the second servo controller adjusts the radial positions of the fixedfan-shaped piece and the mo