Method and apparatus for assessing the effect of yarn faults on woven or knitted fabrics
AssigneeZellweger Luwa AG
InventorRobert Hoeller
Life of this patent
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Abstract
The assessment of the effects of yarn faults is carried out by simulating the fabric image. In a first step, the yarn is examined by a measuring member for parameters associated with the volume and/or the surface. In a second step, these parameters are converted into grey values or color values, and these values are assigned to image spots. Finally, the image spots are reproduced on a video display unit and/or a printer. An image is generated thereby, representing a simulation of a woven or knitted fabric produced from the examined yarn.
Claims36
A method for assessing the effects of yarn faults on the appearance of fabrics produced from such yarn, said method comprising the steps of:
- running an individual sample of the yarn lengthwise through a detector apparatus to produce signals indicative of variations in at least one yarn property along the running length of the individual sample;
- processing said signals and producing image values therefrom, each of said image values being associated with a running length value of said yarn;
- and
- reproducing said image values as image spots in a sequence defined by said running length values.
A method for assessing the effect of yarn faults on woven or knitted fabrics produced from the respective yarn, by simulation of a fabric image, comprising the following steps:
- a. examination of an individual sample along a running length of the yarn for parameters associated with at least one of the volume, the diameter and the surface of the yarn;
- b. conversion of the said parameters into image values and assignment of these image values to image spots, each of said image spots being associated with said running length of the yarn;
- and
- c. reproduction of the image spots in a sequence defined by said running length of the yarn to generate an image which represents a simulation of a woven or knitted fabric produced from the examined yarn.
An apparatus for assessing the effect of yarn faults on woven or knitted fabrics produced from the respective yarn, by a simulation of the fabric image, comprising:
- a measuring member for determining parameters associated with at least one of the volume and the surface along a running length of an individual sample of the yarn;
- a computer for converting said parameters into image values and for assigning the image values to image spots, each of said image spots being associated with said running length of the yarn;
- at least one of a video display unit and a printer;
- and
- control means for reproducing the image spots on the video display unit or the printer in a sequence defined by said running length of the yarn for the purpose of simulating an image of a woven or knitted fabric to be produced from the yarn.
A method for assessing effects of yarn variations in a fabric to be knitted or woven from the yarn without producing said fabric, said method comprising the steps of:
- examining an individual sample of the yarn to determine variations in a predetermined yarn parameter along a running length of the yarn;
- identifying periodic and non-periodic faults in such individual yarn sample based on said step of examining;
- and
- simulating an image of a fabric to be produced using said yarn, said simulated fabric image including alterations in appearance due to said faults, said step of simulating further including the steps of:
- converting said yarn parameter variations into image values, each of said image values being associated with said running length of the yarn;
- and
- assigning said image values to pixel locations in the simulated fabric image in a sequence defined by said running length of the yarn.
Dependencies are inferred from the claim text.