Grip to draw warp ends through shed - has a swing and rotating movement to maintain yarn tension through shed in a seaming machine

摘要

The gripper in a seaming machine, to take the warp ends from a transfer grip, for drawing into an alternately opened shed, has a rotary electrical or pneumatic drive so that when the grip has taken the yarn from the transfer grip, it moves over the whole seam width to apply tension to the yarn, parallel to the woven selvage. Then, lay it parallel to the selvage, it follows a circular movement to give a full insertion in the shed while the yarn is held under tension. The movement of the grip is controlled by two step motors. One step motor is a linear motor with a linear unit to apply a reciprocating movement on the direction of the fabric selvage to which the other step motor is firmly mounted, with a drive shaft to swing the gripper arm of the grip on a circular path. ADVANTAGE - The movements of the grip ensure that the warp yarn is under tension at an angle of 30 deg. to the selvage, even with narrow seams, and its tension is maintained while it is completely laid in place without yarn distortion.