CENTERING AND HOLDING UNIT FOR CAPPING HEAD

摘要

Containers ( 2 ) having a threaded neck ( 3 ) and a mouth ( 4 ) are capped by a unit ( 1 ) appearing as a carousel ( 5 ) equipped with capping heads caused to advance along a circular path (P) and capable of axial movement toward and away from the containers in such a way that each one can be fitted with a relative cap ( 11 ); each capping head of the unit ( 1 ) incorporates a gripper ( 31 ) furnished with two jaws ( 30 ) presenting relative conical surfaces ( 26 ), and respective cylindrical surfaces ( 27 ) designed to locate against the neck ( 3 ) of the container. When the cylindrical surfaces ( 27 ) register against the outer surface of the neck ( 3 ), the conical surfaces ( 32 ) are positioned with the lower edges ( 28 ) encroaching on the area compassed by the mouth ( 4 ) in such a way that the cap ( 11 ) can be gathered and aligned with the neck ( 3 ) of the container ( 2 ) before being tightened, thereby ensuring a precise fit.