Shuttle belt drive to impel shuttle through loom shed - has brake working against torsion spring to match belt speed to ejected shuttle speed to prevent friction damage on pick=up

摘要

The belt drive, to impel a shuttle through the shed of a loom, is linked to the drive motor (2) through a torsion spring unit (3), ranging coaxially through the sley axis (4) mounted to the sley leg coupled to a flywheel (6). Before the belt (11) makes contact with the surface of the shuttle (7) ejected from the magazine (15), it is braked to match the shuttle (7) speed while the motor (2) runs at a constant speed, through the torsion spring unit (3). The twist imposed on the torsion spring is used as additional energy on untwisting to accelerate the belt speed (11) to its original rate. ADVANTAGE - The operation prevents friction damage and energy loss when the belt picks up the shuttle.