Weft insertion mechanism

The utility model discloses a weft insertion mechanism, include that wherein the support frame on rapier weaving machine is fixed to one end, rotate on the support frame and be provided with the yarn dish, be provided with the speed limit body who is used for limiting yarn dish rotational speed on the other end of support frame, speed limit body is including setting up the belt on the support frame and setting firmly the limit collar in yarn dish one side, and belt tensioning ground cover is established on the limit collar. This sets up and has changed original tensioning texture, utilizes the frictional force between belt and the limit collar, and dragging suddenly of yarn of restriction and the yarn that causes dish fast turn -round have been avoided because yarn dish that yarn dish fast turn -round caused send the yarn too much and make the yarn winding influence weft insertion mechanism's normal operating.