Warp shaft tensioning control device on rapier loom

The utility model relates to a warp shaft tensioning control device on a rapier loom. The warp shaft tensioning control device comprises the rapier loom, wherein the rapier loom is provided with a pay-off roller and a yarn tensioning mechanism, the pay-off roller realizes pay-off through driving a controller by a motor, the yarn tensioning mechanism comprises a tensioning roller, an L-shaped swing arm and a tensioning spring, the tensioning roller is installed on one support arm of the L-shaped swing arm, the corner of the L-shaped swing arm is hinged to a rack of the rapier loom, one end of the tensioning spring is hung on the other support arm of the L-shaped swing arm, and the other end of the tensioning spring is fixedly arranged on the rack. The warp shaft tensioning control device is characterized in that the rack beside the other support arm of the L-shaped swing arm is provided with a position sensor used for sensing the swing position of the L-shaped swing arm, the position sensor is connected with a