An improved device for automatic shuttle exchange on weaving looms having multiple shuttle boxes on both sides thereof characterized in that a drive motor is disconnectably related to the first and second operation shafts; clutch assemblies are mounted on both shafts in such an arrangement that, when they are rendered operative at programmed intervals by associated solenoids, they momentarily connect said shafts to said drive motor so as to induce only one complete rotation of the former; a gear combination is provided so as to induce an initial half complete rotation of an eccentric shaft per each complete rotation of the first operation shaft; a box exchange lever is mounted on said eccentric shaft so as to lift a shuttle box assembly to such an extent that a selected shuttle box rises above the Lathe surface level upon one half rotation of the eccentric shaft; said box exchange lever resumes its lower position upon the subsequent half complete rotation of said eccentric shaft which is caused by the next connection of said first operation shaft via said clutch assembly; a shuttle discharge cam is secured on said second operation shaft in an arrangement such as to cause a lateral discharge of the shuttle from said shuttle box which is in the lifted position; a shuttle supply cam is secured on the second operation shaft in an arrangement such as to cause a lateral supply of a new shuttle into said shuttle box after complete discharge of the old shuttle; and a shuttle selector cam is secured on said second operation shaft for selection of said new shuttle.
展开▼
