PURPOSE: To stably drive the knife grids with a relatively simple mechanism by allowing the follower levers of a fork type arm via the driving rod to carry out a to and fro pivoting movement in opposite phase to each other, and to move up and down two knife suspension bars in vertical with the rotation of the follower levers of the fork type arm via the driving rod.

CONSTITUTION: The follower lever 4 that is equipped with two fork type arms 6 arranged opposite to each other on both ends of the central drive shaft which is positioned above the double-lift open-shed Jacquard machine and is extended in the weft yarn direction is reciprocated around the pivoting shaft 5 extending the two arms of the follower bars by the cam disks different in a pair of binding cam and is allowed to move to and fro in vertical in the opposite phase to each other connected via the driving rod 11 to two knife suspension bars, thereby it functions as a carrier of at least one of the horizontal knives arranged in the weft yarn direction.