Optics: measuring and testing – Sample – specimen – or standard holder or support – Cotton graders
Patent
1991-05-26
1993-02-09
Rosenberger, Richard A.
Optics: measuring and testing
Sample, specimen, or standard holder or support
Cotton graders
73159, 356238, G01N 3336, G01N 128
Patent
active
051856395
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a method for preparing and fixing fiber samples to be analyzed optically and to a device for implementing the method.
2. Description of the Prior Art
There are numerous methods and apparatuses for the qualitative and quantitative optical testing of textile fibers. In many test procedures, the irregular fiber material, e.g. cotton flock, cannot be measured immediately, but rather must first be prepared in fiber bands with a parallelized fiber position. Fiber tufts are removed from such fiber bands, which are parallelized beforehand, to serve as a pattern for test devices which require fibers with parallelized fiber position as test material, e.g. optical scanners and image data analysis devices.
Mechanized devices for producing such fiber bands are already known, e.g. according to the Swiss Patent Application No. 01 468/89. The fiber tufts are then produced with commercially available devices, e.g. type FL100/101 or the "Fibrosampler" from the firm of Spinlab.
However, the problem with such devices consists in fixing the fiber samples produced by these devices in their parallelized alignment and distribution in an unchangeable manner up to the point of their actual measurement, but also subsequent to this in order to carry out control or reference measurements.
According to the prior art, e.g. as described in TEXTIL-PRAXIS 1959, issue 4, pages 332-334 "The Cottonometer, a new German fiber length measuring device" [Das Cottonometer, ein neues deutsches Faserlangenmessgerat], the fiber tufts produced with the various devices are inserted in a plexiglass sleeve by hand without special fastening by means of an insertion fork. The disadvantage in this method consists in that the fibers are in an undefined, curled state and the parallelism depends to a great extent on the care of the operator. Moreover, a relatively large quantity of fibers is necessary in order for the fiber sample to be manually transportable at all.
SUMMARY OF THE INVENTION
The present invention seeks to provide a remedy for this. The object of the invention is to provide a method for preparing and fixing fiber samples to be analyzed optically, which method guarantees permanent and certain findings and rules out subsequent changes in the reciprocal position and distribution of the fibers.
The invention meets this object by means of a method comprising placing fibers on a first transparent plate, and while sliding a second transparent plate over the first plate, effecting fixed longitudinal alignment of the fibers. The device for implementing the method which comprises a first optically transparent plate having lateral guides and a second optically transparent plate which slides within the lateral guides.
The advantages achieved by the invention substantially consist in that, as a result of the method according to the invention, the fibers in the fiber tuft are parallelized and stretched in a reproducible manner by means of the constant contact pressure forces and it is possible to preserve the fiber samples in a permanent and reliable (short- and long-term) manner, wherein the fixed fiber sample can easily be directly optically analyzed without further manipulation, even for fiber samples which contain a very small number of fibers.
An embodiment example of the invention which simultaneously explains the principle of operation is shown in the drawing and explained in more detail in the following.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal section through a device for implementing the method, according to the invention, in the opened state;
FIG. 2 shows a frontal view of the device according to FIG. 1 during the aligning process; and FIG. 3 shows a frontal view of the device according to FIG. 1 in the closed state.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The charging process of the device, according to the invention, is shown schematically in FIG. 1. A plurality of fibers 5 to be analyzed is placed on a first glass plate 2 by means o
REFERENCES:
patent: 2299983 (1942-10-01), Hertel
patent: 3591294 (1971-07-01), Neil
patent: 3739183 (1973-06-01), Burton et al.
Soviet Inventions Illustrated. week 88/32, Jul. 14, 1988, Derwent Publications Ltd. (London, GB), abstract No. 88-226823/32 F04503 & SU, A, 1368783 (Ivan Textile Inst.) Jan. 23, 1988.
Textil-Praxis, No. 4, Apr. 1959, M. Hoffmann: "Das Cottonometer, ein neues deutsches Faserlangenmesserat" pp. 332-334.
Textil-Praxis, vol. 27, No. 9, Sep. 1972, M. Preysch: "Neuentwicklungen der Digital Fibrogaphen und ihre Anwendung in der Baum wollspinnerei", pp. 519-524.
Beeler Alfred
Toedtli Sergej
Rosenberger Richard A.
Siegfried Peyer AG
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