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US 4,447,016 AGranted
Rewind apparatus for metal strips
AssigneePerfecto, Inc.
InventorsErik R. Enberg, J. Douglas Plank
Life of this patent
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AssigneePerfecto, Inc.
InventorsErik R. Enberg, J. Douglas Plank
Estimating the term…
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.
Apparatus for simultaneously rewinding a plurality of substantially parallel metal strips into corresponding coils after the strips are cut from a wide strip and adapted to form the coils with generally uniform tension within the strips independent of variations in the thickness and stretch of the strips, said apparatus comprising a rewind unit including a horizontal rewind mandrel having a power driven center shaft, said mandrel including a plurality of axially aligned mandrel sections mounted on said shaft for independent free rotation and adapted to receive the leading end portions of corresponding strips, each of said mandrel sections including at least one coil support shoe movable generally radially between a retracted position and an extended position, a corresponding plurality of fluid operated clutches disposed between said shaft and said mandrel sections and providing for independently driving said mandrel sections from said shaft, means defining a plurality of axially extending fluid passages within said mandrel and connected to corresponding said fluid operated clutches, means for producing a loop in each strip, means for applying a generally uniform tension within the strips between said loop forming means and said rewind unit, a corresponding plurality of loop detectors for independently sensing variations in the corresponding loops within the strips, and means responsive to said loop detectors for variably changing the fluid pressures within the corresponding said fluid operated clutches.
Apparatus for simultaneously rewinding a plurality of substantially parallel metal strips into corresponding coils after the strips are cut from a wide strip and adapted to form the coils with generally uniform tension within the strips independent of variations in the thickness and stretch of the strips, said apparatus comprising a rewind unit including a horizontal rewind mandrel having a power driven center shaft, said mandrel including a plurality of axially aligned mandrel sections mounted on said shaft for independent free rotation and adapted to receive the leading end portions of corresponding strips, each of said mandrel sections including a pair of coil support shoes each movable generally radially between a retracted position and an extended position, a corresponding plurality of air operated cylindrical clutches surrounding said shaft and providing for independently driving said mandrel sections from said shaft, means defining a plurality of axially extending air passages within said shaft and connected to corresponding said air operated clutches, means for producing a loop in each strip, a corresponding plurality of air actuated tension units each having a set of rolls for applying a generally uniform tension within the strips between said loop forming means and said rewind unit, a corresponding plurality of optical loop detectors for independently sensing variations in the corresponding loops within the strips, and means responsive to said loop detectors for variably changing the air pressures within the corresponding said fluid operated clutches.
Dependencies are inferred from the claim text.