Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1989-07-19
1990-11-27
Gilreath, Stanley N.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 181, 242 431, 242 58B, B65H 5432, B65H 5438
Patent
active
049730070
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a yarn traversing apparatus adapted for guiding a running yarn onto a rotating core to form a core supported package.
Yarn traversing apparatus are known which utilize a belt as a linear drive for a traversing yarn guide, note for example U.S. Pat. No. 4,881,694 and DE-OS No. 34 44 648. With such systems, the traversing stroke is easily adjustable and it can also be decreased and increased continuously to produce a stroke modification, and it can also be decreased continuously as a function of the increasing diameter of the package for the production of a package having flattened (bi-conical) end surfaces. However, these systems have a disadvantage in that the reversal of the moved masses at the stroke reversal points involve a substantial loss of kinetic energy.
It is accordingly an object of the present invention to provide a yarn traversing apparatus of the described type which alleviates the problem of substantial losses of kinetic energy resulting from the reversal of the moved masses at the stroke reversal points.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved in the embodiments illustrated herein by the provision of a yarn traversing apparatus which provides for a coupling member which permits the traversing slide to be alternately connected to one of two parallel linear runs of a conveyor belt drive, and which causes the coupling member to be positively driven along a curved drive track at each of the ends of the stroke path, encompassing about 180.degree., and driven at the traversing speed. More particularly, the traversing apparatus of the present invention comprises a slide fixedly mounting a yarn guide, conveyor belt means having parallel runs, means for driving the conveyor belt means and so that the runs move in opposite directions, and means mounting the slide for back and forth movement along a linear stroke path parallel to the runs of the conveyor belt means. The apparatus further comprises control means for coupling the slide to one of the runs adjacent one of the ends of the stroke path and for coupling the slide to the other of the runs adjacent the other of the ends of the stroke path, and so that the slide and yarn guide are reciprocated along the stroke path, and with the control means including a coupling member, means interconnecting the coupling member and the slide, a pair of concavely curved guide tracks mounted in spaced apart, opposing relationship and defining respective ends of the stroke path, and means for positively driving the coupling member along the curved guide track at each of the ends of the stroke path at the traversing speed.
In a preferred embodiment, the control means further comprises means mounting at least one of the guide tracks for selective movement toward and away from each other so as to effectively lengthen and shorten the stroke path of the slide. This arrangement permits the winding machine to be designed and constructed such that, during a winding cycle, the traverse stroke can be continuously decreased at one or both ends, or be continuously varied between a maximum and a minimum. As a result of a continuous shortening of the traverse stroke, a package with conical or biconical end faces may be formed. The recurrent variation of the traverse stroke between a maximum value and a minimum value is commonly referred to as "stroke modification". An advantage of the present invention is the fact that as a result of this stroke modification, a ribbon breaking function is also achieved.
The movement of the curved guide tracks, which are positioned at the stroke ends, may be continuously adjusted in the longitudinal direction of the traverse stroke as a function of the increasing diameter (biconical winding) or as a function of time, or the winding diameter, or any other program.
According to the present invention, a substantial portion of the kinetic energy of the moved masses is transmitted in the stroke reversal zones from the one
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Runkel Walter
Schippers Heinz
Urbahn Friedrich
Weber Klaus
Barmag AG
Gilreath Stanley N.
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