Device for controlling weft yarn storing units for jet looms

A control device for controlling the storage amount of a selected weft yarn in a storage device for a jet loom having a plurality of weft yarn storing units wherein a plurality of weft yarns are stored in respective weft yarn storing units according to weaving pattern command signals produced by a command means, and in the weft insertion cycle of each weft yarn storing unit, the weft yarn stored therein is jetted to the loom to perform a weft insertion, comprising:

• rotation detecting means for detecting a rotational condition of the driving shaft of a loom body, to output a driving shaft rotation signal;
• a rotation control circuit which, according to a weft yarn jetting order command signal, calculates the numbers of standby cycles between weft insertion cycles of said weft yarn storing units, and calculates the speeds of rotation of weft yarn storing sections in said weft yarn storing units to store weft yarns for weft insertion in advance according to the numbers of standby cycles thus calculated, to produce rotation command signals;
• a driving circuit for receiving the driving shaft rotation signal from said rotation detecting means and the rotation command signals from said rotation control circuit, to produce drive signals to determine the speeds of rotation of said weft yarn storing units;
• and
• drive means provided for said weft yarn storing units, respectively, each drive means receiving the drive signal from said drive circuit to drive a respective weft yarn storing unit at a speed of rotation corresponding to said drive signal thus received,
• a weft yarn having a length corresponding to a predetermined weft insertion length being stored in said weft yarn storing units in weft insertion cycles selected according to said weft yarn jetting order command signal.