38 which is in turn fixedly connected to the frame 1 and consists of lower and upper grip members 15a 15b between which the weft yarn 11 lies the gripping and releasing action of the weft yarn 11 is carried out by contacting and separating the upper grip member 15b relative to the lower grip member 15a under the swingable movement of a lever 42 which is rotatably mounted on a fixed shaft 41 the swingable movement of the lever 42 is made by a cam 40 fixed to a shaft 39 projected from the gear box 20 the reference numerals 43 44 designate weft guides respectively disposed forward and rearward of the weft brake 15 with this arrangement the rotatable shaft 22 rotates together with the guide pipe 23 in timed relation to the main shaft of the loom so that the weft yarn 11 is wound on the winding section 24a of the drum 24 while the engaging pins 29 30 project into and withdraw from the holes 27 28 at the predetermined timings more specifically such an operation will be explained assuming the time point of the termination of weft picking as an initial point first when the weft picking terminates.