Rewind apparatus for metal strips

摘要

A web of metal is unwound from a coil and cut into longitudinal strips which are directed into corresponding loops and then through tension units to a set of strip rewind units each having a horizontal mandrel. Each rewind mandrel has a driven center shaft which supports independent mandrel sections for receiving and rewinding the separate strips into corresponding coils. Each mandrel section has a set of collapsible coil support shoes and is driven by a corresponding air actuated clutch. The air pressure to each clutch is precisely varied by a control system which senses changes in the corresponding loop in the steel strip so that each steel strip is rewound independently of the other steel strips. Thus all of the steel strips are rewound at substantially constant tension into corresponding rewind coils independent of variations in thickness of the strips and in elongation of the strips due to internal stresses. Each mandrel section is locked to the shaft in a predetermined orientation to facilitate removal of the rewound coils after the shoes are collapsed.