Textiles: weaving – Stopping – Weft
Reexamination Certificate
1999-05-28
2001-01-09
Falik, Andy (Department: 3741)
Textiles: weaving
Stopping
Weft
C250S559150, C250S559400
Reexamination Certificate
active
06170536
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method and apparatus for optically monitoring filling yarns, hereafter “fillings”, being inserted into a shed using essentially collimated light rays directed transversely to a guide duct onto photo-sensitive detectors, with detection of the interruption of the lightbeams by fillings, and to a detector with which to implement the method.
2. Description of the Related Art
It is known form U.S. Pat. No. 3,853,408 to direct a bundle of collimated light rays transversely to a filling guide-duct onto a plurality of photo-detectors mounted in a row transversely to the guide duct. Interruption by a filling of the light beams to the photo-detectors is detected and so processed by an analyzer that the presence of a filling is recognized.
SUMMARY OF THE INVENTION
The objective of the invention is to improve the method of the initially cited kind.
This problem is solved in that the particular filling positions shall be detected which these fillings assume when being inserted into the guide duct.
The method of the invention not only allows detecting the presence of a filling, but also and foremost its position in the guide duct.
In an implementation of the invention, when two or more fillings are inserted simultaneously, the positions of all fillings and hence the presence of all fillings shall be detected.
In another implementation of the invention, the filling positions shall be detected twice or more in sequence during insertion. As a result, not only is it possible to distinguish whether a filling was in fact inserted, or for instance if only a filling fluff or a filling segment moved through the guide duct, but also changes in the filling positions in this guide duct. Moreover advantageously, filling insertion shall be monitored when two or more fillings are inserted simultaneously. Because the fillings move relative to one another when being inserted into the yarn guide duct, it is possible therefore to ascertain during one of the detection procedures whether two or more fillings lie adjacent to each other, that is, whether two or more fillings are present.
To facilitate adjusting the device inserting the fillings, another implementation of the invention provides that the filling positions during one insertion and/or changes in the filling positions shall be displayed. As a result and for instance in the case of an airjet weaving machine, herein loom, an operator is able to so set the functions of the main and auxiliary airjet nozzles that the fillings shall be inserted into a specified zone of the guide duct.
The problem is solved by a filling detector in which an analyzer is fitted including a device for determining the filling's positions when they enter the guide duct.
REFERENCES:
patent: 3853408 (1974-12-01), Kaalverink
patent: 4716942 (1988-01-01), Jensen et al.
patent: 5063973 (1991-11-01), Kitamura et al.
patent: 5136499 (1992-08-01), Rydborn
patent: 5251673 (1993-10-01), Adachi et al.
patent: 5329961 (1994-07-01), Bouvyn et al.
Peeters Jozef
Vandenabeele Frans
Verhulst Joseph
Bacon & Thomas PLLC
Falik Andy
Picanol N.V.
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