Compact single mandrel creel for over end take-off thread delivery
View Patent ↗The present invention compact creel using the OETO method that accommodates an increased number of packages in a relatively small footprint while providing a straight in-line delivery path in which fiber bends and changes in direction are minimized. In addition, the present invention is a system, apparatus and method for tension control in a fiber feeding system that provides a fast and reliable method for feeding high tack elastomeric thread or fiber from a package to a manufacturing process. Furthermore, the present invention provides a method and apparatus for changing packages on a creel without interrupting the manufacturing process. In particular, the compact creel of the present invention provides for continuous operation of unwinding and fiber delivery by allowing a standby package to be loaded on the same mandrel as an active package that is presently being unwound.
1. A method for positioning and loading at least one new standby package on a mandrel of a creel while an active package is being unwound, wherein said mandrel is supported on a creel frame by a package support assembly including a mandrel support bar pivotally mounted on said frame comprising:
sliding a new standby package over an end of the mandrel adjacent to a side of said mandrel support bar, at least one of an active package and a standby package being adjacent to an opposite side of said mandrel support bar;
tying a leading fiber end of the new standby package to a trailing fiber end of the at least one of an active package and standby package;
pivotally and detachably mounting a package change fixture on said creel frame adjacent to said end of said mandrel and inserting a mandrel core holder and an end pivot stud of said package change fixture into the mandrel and creel frame, respectively;
releasing the package support assembly and pivoting the package support assembly away from the mandrel;
pivoting the package change fixture, the mandrel, the mandrel support bar, and packages upward at least 10° until the end of the mandrel support bar disengages a mandrel support bolt;
removing the mandrel support bar from the creel frame and from slots in the mandrel;
pivoting the package change fixture, mandrel, and packages until the package change fixture contacts and is aligned with the creel frame;
sliding the standby package onto the mandrel at least until the new standby package contacts the at least one of the active package and a standby package and further sliding the new standby package to eject an exhausted core of an old active package from the end of the mandrel;
reinserting the mandrel support bar through the slots in the mandrel and into the support bar slots of the creel frame;
pivoting the package change fixture, mandrel and packages upward at least 10°;
pushing the mandrel support bar into the creel frame until the mandrel support bar is aligned with the mandrel support bar bolt;
pivoting the package change fixture, mandrel and packages back down to a normal operating position; and
removing the package change fixture by pulling outward until the pivot stud and the mandrel core holder are disengaged from the creel frame and mandrel, respectively.
2. A method for positioning and loading at least one new standby package on a mandrel of a creel while an active package is being unwound wherein said mandrel is supported on a creel frame by a package support assembly pivotally mounted on said frame comprising:
sliding a new standby package over an end of the mandrel adjacent to a side of said package support assembly, at least one of an active package and a standby package being adjacent to an opposite side of said package support assembly;
tying a tail end of a fiber of the at least one of an active package and a standby package to the lead end of a fiber of the new standby package;
detachably mounting a package change fixture to the creel frame to support the mandrel;
inserting a mandrel core holder of the package change fixture into the mandrel and locking the mandrel core holder in place to support the packages and mandrel;
releasing the package support assembly from the mandrel and pivoting the package support assembly away from the mandrel;
sliding the new standby package along the mandrel until contacting at least one of the active packages and standby package and further sliding the new standby package until an exhausted core is ejected;
reconnecting the package support assembly to support and secure the mandrel; unlocking the mandrel core holder of the package change fixture from the mandrel; and
removing the package change fixture from the mandrel and creel frame.
3. The method of claim 1 or 2 further comprising the steps of monitoring and adjusting the net tension of a fiber group or the tension of a single fiber by at least one of increasing, maintaining or decreasing the tension on the fiber group or fiber.