Unwind and feed system for elastomeric thread
AssigneeOverEnd Technologies LLC
InventorRichard J. Hartzheim
Life of this patent
Estimating the term…
Abstract
An overend unwind system for unwinding tacky elastomeric fiber threads such as uncoated spandex thread, capturing the ballooning affect of the thread as the thread leaves the spool, applying a first-stage tension control on the thread adjacent where the thread leaves the spool, feeding the unwound thread to a nip in a downstream process, and applying a final tension increment to the thread adjacent where the thread enters the downstream process. All thread guide surfaces encountered by the thread after leaving the spool, and while the thread is under designed operating tension, are moving surfaces, such that the tensioned thread thereby experiences a reduced level of drag as the thread traverses its path of travel from the spool to the downstream process.
Claims66
Thread capture apparatus adapted to capture loping thread being drawn off a package of such thread, said thread capture apparatus comprising a plurality of
- thread capture elements which are collectively effective to capture such loping thread and to substantially eliminate such loping action in such thread downstream of said thread capture apparatus, each said thread capture element defining at least one thread engaging surface, such thread engaging surfaces being adapted to move in directions corresponding to longitudinal directions of movement of such thread across the respective said thread capture elements,
- said thread capture apparatus comprising,
- as a first said thread capture element, a first rolling capture element comprising a first elongate roller having a first said thread engaging surface, said first elongate roller being adapted and positioned to serve as an initial contact element for such thread being drawn from such package of thread, said first thread capture element having a first axis of rotation generally transverse to the longitudinal direction of movement of such thread across said first thread capture element,
- as a second said thread capture element, a second rolling capture element proximately downstream from said first rolling capture element, said second rolling capture element having a second said thread engaging surface and a second axis of rotation transverse to the first axis of rotation of said first thread capture element,
- as a third said thread capture element, a third rolling capture element proximate said second rolling capture element, said third rolling capture element having a third said thread engaging surface and a third axis of rotation transverse to the first axis of rotation of said first thread capture element,
- said first elongate roller being disposed in a first orientation wherein the first axis of rotation is transverse to the general direction of advance of such loping thread before such thread reaches said first elongate roller, and wherein such thread encounters said first rolling capture element, as the initial contact element after leaving such package of thread,
- and wherein such thread, during normal dynamic ongoing operation of said thread capture apparatus, passes across a surface of said first elongate roller, and from said first elongate roller onto said second rolling capture element, turns around said second rolling capture element, and passes thence onto said third rolling capture element, and turns around said third rolling capture element.
Thread capture apparatus adapted to capture a thread being drawn from a source, said thread capture apparatus comprising a plurality of thread capture elements which are collectively effective to capture such thread, each said thread capture element defining at least one thread engaging surface, such thread engaging surfaces being adapted to move in directions corresponding to longitudinal directions of movement of such thread across the respective said thread capture elements,
- said thread capture apparatus comprising,
- as a first said thread capture element, a first rolling capture element comprising a first elongate roller having a first said thread engaging surface, said first elongate roller being adapted and positioned to serve as an initial contact element for such thread being drawn from such package of thread, said first thread capture element having a first axis of rotation generally transverse to the longitudinal direction of movement of such thread across said first thread capture element,
- as a second said thread capture element, a second rolling capture element proximately downstream from said first rolling capture element, said second rolling capture element having a second said thread engaging surface and a second axis of rotation transverse to the first axis of rotation of said first thread capture element,
- as a third said thread capture element, a third rolling capture element, said third thread capture element having a third said thread engaging surface and a third axis of rotation transverse to the first axis of rotation of said first thread capture element, and
- said second rolling capture element being between said third rolling capture element and said first rolling capture element, said thread capture apparatus being adapted to receive a thread advancing from such thread package at one of said plurality of thread capture elements, such that such thread subsequently encounters said second rolling capture element, and after encountering said second rolling capture element, encounters said third rolling capture element.
Thread capture apparatus adapted to capture loping thread being drawn off a package of such thread, said thread capture apparatus comprising a plurality of thread capture elements collectively effective to capture such loping thread and to substantially eliminate such loping action in such thread downstream of said thread capture apparatus, each said thread capture element defining at least one thread engaging surface, such thread engaging surfaces being adapted to move in directions corresponding to longitudinal directions of movement of such thread across the respective said thread capture elements,
- said thread capture apparatus comprising,
- as a first thread capture element, a first rolling capture element comprising a first elongate roller having a first said thread engaging surface, said first elongate roller being adapted and positioned to serve as an initial contact for such thread being drawn from such package of thread, said first thread capture element having a first axis of rotation generally transverse to the longitudinal direction of movement of such thread across said first thread capture element,
- as a second said thread capture element, a second rolling capture element proximately downstream from said first rolling capture element, and along a path of travel of such thread, said second rolling capture element having a second said thread engaging surface and a second axis of rotation transverse to the first axis of rotation of said first thread capture element, and transverse to such path of travel of such thread, and
- a rolling thread guide positioned relative to said first and second thread capture elements, and downstream along such thread path from said second thread capture element,
- said first and second thread capture elements, and said rolling thread guide being so positioned and oriented that such thread, when drawn along such thread path by a force exerted at said rolling thread guide, approaches said first thread capture element from a first direction, wraps about said first thread capture element and leaves said first thread capture element in a second different direction directed toward said second thread capture element, wraps about said second thread capture element at least 90 degrees, and leaves said second thread capture element in a third different direction directed toward said rolling thread guide, and traverses thence along such third direction to said rolling thread guide.
Dependencies are inferred from the claim text.