Claims
- 1. 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.
- 2. A device according to claim 1, in which said gripper actuators are adjustably positioned along said slay in accordance with the desired width of the fabric to be woven within the limits defined by said shuttle boxes.
- 3. A device according to claim 1, in which said grippers have yarn gripping portions and have operating portions in advance of said yarn gripping portions in the direction of shuttle movement; said actuator control means being positioned at a distance outside the shed substantially equal to the distance between the yarn gripping portion and the operating portion of each gripper, to actuate said grippers to release a weft yarn substantially at the exit edge of the shed considered in the direction of shuttle movement.
- 4. A device according to claim 1, including respective second mounting means mounting yarn guides adjacent each end of said slay, said second mounting means being displaceably vertically relatively to said slay; respective second resilient means biasing each second mounting means upwardly to an inoperative position of the respective yarn guide; and a respective second cam means engaging means articulated on each second mounting means for operation by said cam means, to lower the associated second mounting means, responsive to engagement of said second cam means engaging means only when said slay is moving in the opposite predetermined direction, said second cam means engaging means, when engaged with said cam means during movement of said slay in said one predetermined direction, being displaced to an inoperative position.
Priority Claims (2)
Number |
Date |
Country |
Kind |
26285/73 |
Jul 1973 |
IT |
|
8408/74 |
Mar 1974 |
IT |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is a continuation-in-part of my prior application Ser. No. 480,105, filed June 17, 1974, now abandoned.
US Referenced Citations (9)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
480105 |
Jun 1974 |
|