Method and device for dummy shuttle operation on conventional shuttle looms
AssigneeCampagnie des Brevets et Applications Industrielles Etablissement
InventorBruno Romanin
Life of this patent
Estimating the term…
Abstract
The method and device convert conventional shuttle looms into dummy shuttle looms, wherein weft yarns, unwound from stationary bobbins or the like outside the loom, are seized, pulled across the warp yarn shed and then released, by means of a so called dummy shuttle or weft gripper, at adjustably selected points along a dummy shuttle path extending along the loom slay, independently of the slay instantaneous position and movement direction. The slay motions and direction changes are utilized to selectively operate weft yarn bearers and weft gripper opening mechanisms for seizing the weft yarns and releasing the same, respectively, at the inlet and at the outlet of the dummy shuttle path across the shed.
Claims4
A device for converting a shuttle loom, including a stationary supporting frame, a cylically oscillatable slay mounted on the frame, slay oscillating means, a heald assembly cyclically opening sheds of the warp yarns, a weft yarn carring shuttle carried by the slay and reciprocable thereon in a shuttle path extending parallel to the axis of oscillation of the slay, and shuttle boxes and pickers at opposite ends of the slay for receiving the shuttle and reciprocating the shuttle through open sheds, into a dummy shuttle loom without modification of the operation of the shuttle loom in oscillating the slay, in operating the heald assembly, and in reciprocating a shuttle through open sheds by operation of the shuttle boxes and pickers, said device comprising, in combination, a dummy shuttle reciprocable along said slay, having a transverse dimension substantially equal to that of said first-mentioned shuttle and braking surfaces engageable with said shuttle boxes, operatively cooperable with said shuttle boxes and pickers, formed with a longitudinal groove to receive weft yarn guides, and provided, adjacent each end, with releasable weft yarn grippers operable to grip a weft yarn as said dummy shuttle enters the shed;
- respective gripper actuators mounted on said slay adjacent each end thereof and operable to actuate said grippers to release a weft yarn as said dummy shuttle exits from the shed;
- respective gripper actuator control means mounted on said stationary supporting frame in the paths of oscillation of said gripper actuators and directly engageable with said gripper actuators, to actuate said grippers to release a weft yarn, responsive solely to oscillatory motion of said slay relative to said stationary frame and reciprocation of said dummy shuttle along said slay;
- respective mounting means mounting the gripper actuators adjacent each end of said slay, said mounting means being displaceable vertically relative to said slay;
- said control means comprising cam means operable to engage said mounting means during slay movement through a predetermined arc of its oscillatory motion in each direction;
- resilient means biasing each mounting means upwardly to an inoperative position of respective gripper actuator mounted thereon;
- a respective cam means engaging means articulated on each mounting means for operation by said cam means, to lower the associated mounting means, responsive to engagement of said cam means engaging means only when said slay is moving in one predetermined direction, said cam means engaging means, when engaged with said cam means during movement of said slay in the opposite direction, being displaced to an inoperative position.
Dependencies are inferred from the claim text.