To suppress upward air flow caused by the rocking motion of the reeds.

Plate members are arranged at at least upper part of the reed-rocking range and the plate members are allowed to get close to the reeds so that the plate members may suppress the upward air flow. The plate members are extended from the midway of the reeds-rocking range to the most backward position. At least a part of the plate members are made movable to the frame and the reeds are made visible from the moving site. A support member is placed between at least a part of the plate members and the frame, at least a part of the plate members are made rotatable or detachable to the supporting member. At least a part of the plate members are made slidable along the weft insertion direction. The plate members together with the supporting member are made movable to the frame. A plurality of plate pieces in the plate members are arranged in parallel. The reed upper part at the most front position in the reed-rocking range and the opposing turning part are set to the plate members. A projection is extended downward on the reed face side of the plate member.