A SHUTTLELESS LOOM HAVING AN IMPROVED GRIPPER ROD TRANSMISSION

摘要

A gear drive for a shuttleless loom having a coupling train between a power input shaft and a power output member for reciprocating a weft thread gripper device into and out of a loom shed. The coupling train has a gear lever journalled for an oscillating motion which transports the weft thread gripper device. The coupling train also includes a piston rod type coupling link between the power input shaft and the gear lever. One end of the piston rod is journalled by a crank pin to the power input shaft. The other end of the piston rod is connected to a fork of the gear lever by a journal bolt having wedge type teeth and grooves in its facing ends which cooperate with respective teeth and grooves in the fork for an adjustment of the coupling point between the piston rod and the gear lever along elongated guide slots in the fork of the gear lever. The guide slots and wedge type teeth and grooves have the shape of a circular arc having its center of curvature on a line extending in parallel to the rotational axis of the power input shaft and through an end point of the motion of the crank pin. This arrangement permits a precise adjustment of the stroke of the weft thread gripper device and transmits substantial forces without problems.