Web winding apparatus

In a winding machine for winding a plurality of packages simultaneously, a winding shaft for receiving a plurality of cores, a clutch for clutching each winding core to the winding shaft comprising concentrically arranged inner and outer parts, means for securing the inner part to the shaft for rotation therewith, bearings on the inner part mounting the outer part thereon for rotation relative to the inner part, axially spaced radially protruding surfaces on the inner part, defining an annular recess therebetween, a radially protruding core on the outer part corresponding in axial length to the distance between the outer sides of the radially protruding surfaces on the inner part, said axially spaced radial surfaces on the inner part and the opposed surface of the core on the outer part defining working gaps, a coil wound onto the inner part in the annular recess, a quantity of particulate magnetizable material in the recess and means for retaining the particulate material within the working gaps comprising nonmagnetizable rings recessed into the outer sides of the protruding surfaces in concentric relation to each other with closure gaps therebetween which decrease from the inner sides of the rings toward the outer sides and sealing strips held engaged with the outer sides of the rings across the gaps therebetween.

A winding apparatus comprising a shaft, winding cores disposed along the shaft, means for clutching each core to the shaft independently of the others, each means comprising an inner part adapted to be secured to the shaft for rotation therewith, an outer part adapted to be supported for rotation above the inner part, said outer part having a larger inside diameter than the inner part, bearing members supporting the outer part in concentric relation to the inner part, axially spaced radially extending flanges on the outer surface of the inner part between which there is an annular recess, an axially extending core protruding radially from the inner side of the outer part, the peripheral surfaces of the flanges and the core defining working gaps, a coil disposed in the annular recess, particulate magnetizable material disposed in the recess about the coil, means for retaining the particulate material in the working gaps, and means including a potentiometer connecting the coil of each clutch means to a power source.

A winding apparatus comprising a shaft, winding cores disposed along the shaft, means for clutching each core to the shaft, comprising electromagnetic clutch assemblies mounted along the shaft one for each core each provided with a separate lead and current control device such that each can be adjusted independently of the other, each magnetic assembly comprising an inner part adapted to be fixed to the shaft for rotation therewith, an outer part, a bearing supporting the outer part in concentric relation to the inner part, said inner and outer parts having, respectively, outer and inner surfaces which define work gaps, magnetizable particulate material situated in the gaps, means embodied in the inner part for generating an electromagnetic field in the gaps between the surfaces, nonmagnetizable insulators outwardly of the respective ends of the surfaces defining sealing gaps which converge outwardly but do not touch and sealing strips held in engagement with said insulators across the gaps therebetween.

In an apparatus for unwinding sheet material from a package, dividing it into narrow strips and rewinding the strips to form separately wound packages, a first shaft on which the package of sheet material is mounted, slitting means over which the sheet material is drawn for slitting it into narrow strips, a second shaft and means for rotating said second shaft, cores on the second shaft on which the narrow strips are to be wound, means on the first and second shafts for adjustably restraining rotation of the package relative to the first shaft and the cores relative to the second shaft, there being one such means associated with each core on the second shaft, means for effecting operation of each of said means independently of any other such means, and means for effecting adjustment of each of said means as the package increases in diameter to maintain predetermined tensions in the strips being wound on the cores.

A winding apparatus comprising a shaft, winding cores disposed along the shaft, means for clutching each core to the shaft independently of the others comprising electromagnetic clutch assemblies mounted along the shaft, each provided with a separate lead and a current control device such that each can be adjusted independently of the others, each electromagnetic clutch comprising an inner part adapted to be fixed to the shaft for rotation therewith, an outer part, bearings supporting the outer part for rotation relative to the inner part, said inner and outer parts having, respectively, outer and inner surfaces which define working gaps, magnetizable material situated in the gaps, means embodied in the inner part for generating an electromagnetic field in the gaps between the surfaces, nonmagnetizable insulators outwardly of the respective ends of the surfaces defining sealing gaps which converge outwardly but do not touch and nonmetallic strips held in engagement with the insulators across the sealing gaps therebetween.

A winding apparatus comprising a winding shaft, winding cores disposed along the shaft, means for clutching each core to the shaft independently of the others, comprising magnetic clutch assemblies mounted along the shaft, and means providing each clutch assembly with a separate lead and current control device such that each can be adjusted independently of the others, each magnetic clutch comprising inner and outer concentrically arranged parts, means fixing the inner parts to the shaft, means rotatably supporting the outer parts on the inner parts for rotation relative thereto, poles on the respective parts between which there is a working gap, means for confining particulate magnetizable material in the working gaps, means for driving the shaft and means for producing a magnetic field between the poles for magnetizing the particulate material in the working gaps, said last means comprising a coil associated with one of the parts, means for supplying current to the coil and means for adjusting the current flow through the coil.