An apparatus for preparing a weft to be picked upon starting the operation of a weaving loom, said weaving loom comprising a means for driving said weaving loom, a means for measuring said weft to be picked by said picking means, a means for driving said weft measuring means, shiftable connection means normally engaging said weaving loom driving means and said means for driving said weft measuring means, and an auxiliary means for driving said weft measuring means, said apparatus further comprising:
- a means for shifting said connection means from said weaving loom driving means to said auxiliary driving means whereby said auxiliary driving means drives said weft measuring means;
- and
- a means for positioning said weft measuring means at a position suitable for being threaded with said weft when said weft measuring means is driven by said auxiliary driving means, and for controlling said auxiliary driving means so as to store a predetermined amount of weft on said weft measuring means after threading said weft thereonto.