Textiles: weaving – Pattern mechanism – Picture pattern
Reexamination Certificate
2000-01-26
2001-03-20
Calvert, John J. (Department: 3741)
Textiles: weaving
Pattern mechanism
Picture pattern
C139S332000, C139S333000
Reexamination Certificate
active
06202704
ABSTRACT:
The invention relates to a method for pattern representation on inhomogeneous crossing grids in the field of textile design.
The goods removal of conventional weaving machines is controlled by a gear system wherein a change, for example, to a different yarn density is performed by a corresponding exchange of gears. For some time now weaving machines have been available in which the goods removal is controlled e.g. by step motors (or other controllable motors). This simplifies manipulation considerably because a changeover now does not require retooling to different gears. Only the electrical control of the step motors must be changed. Furthermore, the step motor drive provides new advantages because in contrast to the rigid gear system, it is possible to provide a variable control of the step motors so that the density of the weft yarns during the weaving process can be changed.
A textile designer determines during pattern conception the bonding points, i.e., the crossing locations between the warp and the weft yarns (threads). This is performed with the aid of so-called weave designs, i.e., the drafting representation of a fabric bonding on special quadrille paper (pattern paper) or on a corresponding quadrille grid representation on a computer monitor. Depending on the fabric quality (warp and weft yarn density) the number of rectangles in the height and width changes for the pattern paper. In a conventional weaving machine, as soon as it is adjusted, the warp and weft yarn base density is constant. In a weaving machine with step motor drive, as mentioned above, the weft yarn density may be constantly changing and may change several times in different ways. This results in the problem that the designer can no longer reproduce a pattern on pattern paper, i.e., with a homogenous grid of identical rectangles (because for a density change a corresponding rectangle change must take place). This problem is independent of whether pattern paper or a corresponding monitor representation is used.
In other words, the pattern designer cannot use the design liberties which are made available by yarn density changes in a step motor driven weaving machine because the fabric bonding with the correlated pattern cannot be represented.
Based on this, the present invention is to provide a method with which patterns for fabrics can be represented in which the warp and/or weft yarn density changes. The change of yarn density can reside in a change of the yarn number per length unit, in a change of the yarn thickness or strength of one or multiple yarns, or in a combination of such measures.
The object is solved by a method for pattern representation on inhomogeneous crossing grids of warp and weft yarns, in which:
a) an inhomogeneous real crossing grid (a
1
through a
4
, b
1
through b
3
) is predetermined based on the real warp yarn density and the real weft yarn density;
b) a homogenous virtual point grid with considerably increased resolution is overlaid onto the inhomogeneous real crossing grid;
c) a pattern (S; S
1
through S
5
) is represented in the homogenous virtual point grid; and
d) those points of the virtual homogenous point grid are determined which coincide with the crossing points of the real inhomogeneous crossing grid corresponding to the pattern.
In a preferred embodiment of the inventive method, interpolation is performed between neighboring points of the virtual homogenous point grid
The interpolation is advantageously based on a small point group which belongs to a single crossing point of the inhomogeneous real crossing grid.
The neighboring point groups are expediently connected by conjoined smaller point groups.
REFERENCES:
patent: 19712631A1 (1998-05-01), None
patent: 0461514A2 (1991-12-01), None
patent: 0692562A1 (1996-01-01), None
Böhme Steffen
Thomas Wolfgang
Calvert John J.
EAT GmbH “The DesignScope Company”
Muromoto Jr. Robert H.
Robert W. Becker & Associates
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