Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1994-09-07
1997-02-25
Mansen, Michael R.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 43R, B65H 5438, B65H 5428
Patent
active
056052952
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a method and a device for winding yarns on to a tube by means of the so-called stepped precision winding principle.
BACKGROUND OF THE INVENTION
DOS 3332382 demonstrates a winding device designed for building a bobbin by means of the stepped precision winding process. In particular, this DOS proposes the input of winding ratios into a memory which are then retrieved as required during the bobbin travel. A "step" from one winding ratio to another is initiated in relation to the determined ACTUAL value of the crossing angle of the bobbin--see FIG. 3 of the DOS document.
EP-C-64579 demonstrates another machine which is suitable for winding according to the stepped precision winding process. The winding ratios are again stored in memory as (M/N number pairs). In this case the steps are tripped in relation to the diameter of the bobbin (see FIGS. 7 to 9 and the corresponding description on page 7 of the EP Patent Specification).
SUMMARY OF THE INVENTION
The invention proposes, as a first aspect, a method for building a package with a stepped precision winding system, whereby the winding ratio is changed when the crossing angle assumes a predetermined value, characterized in that the crossing angle is determined by comparison of circumferential speed of the package with a value derived from rotational speed of the package.
The invention proposes, as a second aspect, a method for building a package with a stepped precision winding system characterized in that a signal for controlling the traverse is obtained by the adaptation of a chuck rotation signal in relation to a predetermined winding ratio, whereby the predetermined winding ratio is determined in relation to the instantaneously determined crossing angle.
BRIEF DESCRIPTION OF THE DRAWING FIGURES
The invention is described in greater detail with reference embodiments as examples.
FIG. 1 shows a view of a winder, at the bobbin side,
FIG. 2 shows a cross-section through the contact roller and the bobbin chuck at the start of winding, in accordance with our EP Patent 200234,
FIG. 3 shows an example of a possible circuit arrangement for activating a means for regulating the rotational speed of the bobbin chuck, similar to FIG. 6 of U.S. Pat. No. 5,462,239 of 23.07.1992,
FIG. 4 shows a representation of the frequency curve of the contact roller following activation by "detuning" of the contact roller frequency by the bobbin, similar to FIG. 7 of U.S. Pat. No. 5,462,239,
FIG. 5 shows a schematic representation of the signal connection between the bobbin chuck and the traverse of the machine according to this invention,
FIG. 6 is a diagram illustrating the application of the stepped precision winding process according to this invention,
FIG. 7 shows a schematic representation of further details of the arrangement as in FIG. 5,
FIG. 8 is a diagram illustrating the crossing angle progression.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, Ref. 1 indicates a high-speed winder for, in particular, synthetic filaments. For the purpose of simplifying the description only one yarn path is shown. In practice, on machines of this type up to eight bobbins are arranged adjacent to each other on each chuck. The construction of the machine 1 is that known in the art, such as that described for example in the above-mentioned European Patent Specification No. 0200234.
For the same reason of simplification, only the elements which are essential to the description of the invention are shown in the figure. Ref. 3 is the casing of the machine 1. A revolver 5, which swivels around an axis 7, carries a chuck 9 at each end, a tube 11 being mounted on each chuck. The lower chuck 9 is shown with the package 10 of a full bobbin 13; only a very small quantity of yarn has been wound on to the upper tube 11, this yarn being scarcely visible in FIG. 1. The yarn 15 which runs from the top is passed backwards and forwards by a traverse device 17, passing around a tacho or contact roller 19 before reaching the tube 11. FIGS. 1 and 2 show,
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Mansen Michael R.
Maschinenfabrik Rieter AG
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