Textiles: weaving – Warp manipulation – Shedding
Patent
1994-12-05
1997-07-08
Falik, Andy
Textiles: weaving
Warp manipulation
Shedding
139110, D03C 1500, D03C 906
Patent
active
056451113
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device associated with a weaving machine, in which warp threads lead from warp beams, via shaft frames or harnesses, to feed rollers. Shaft frames or harnesses are controllable for the creation and changing of open and closed sheds to enable weft threads to be inserted by means of shuttles. Also forming part of the weaving machine is a reed, which is arranged so as to operate toward and away from a butting edge. The butting edge or fell represents the edge or fell of the finished fabric and is situated at a distance in front of the feed rollers.
BACKGROUND OF THE INVENTION
Weaving machines in the form of generic-type shaft machines are well known. In such machines, the shaft frames or harnesses are activated individually or in a coordinated manner toward positions for open or closed sheds. When weaving is in progress, warp and weft threads represent a swinging system. During weaving, it is important for the thread tensions to be able to be checked and kept within certain prescribed ranges so that the finished woven product can be produced having the desired quality and characteristics. Various attempts have been made to achieve the necessary control of the various constructional and functional parts of the weaving machine and the various qualities and characteristics of the warp and weft threads. These attempts have been more or less successful.
SUMMARY OF THE INVENTION
Modern development places higher demands upon manufactured products than before. Similarly, weaving machine manufacturers are faced with higher demands regarding the functions of weaving machines. The functions must be able to be performed with greater reliability. Also, the functions must enable simpler operating and handling procedures, faster weaving speeds, long working lives, long service intervals, among other things. In addition, price pressure bears upon product development, production, among other things, and on the actual machine construction. The weaving machine has to be able, among other things, to work with few operating breakdowns and stoppages.
The above means, among other things, that recourse must be taken to a refined control function for functional parts forming part of the weaving machine. The control and functions of the shaft frames or harnesses, among other things, have a critical bearing upon the control over the swinging mass that the thread arrangement in the machine represents. It is important for the race boards in the open sheds to be able to be arranged precisely, despite differences in the quality of the thread material, production variances in the machine, among other things. This means, in turn, that similar shed images have to be able to be established in the various weaving instances and weaving functions. Control systems for the shaft frames or harnesses are of critical importance to the checking of the thread tensions. The object of the present invention is to solve, among other things, these problems.
The warp thread tensions should also be adaptable to the tensions of the weft threads and/or to their wrapping around, or various bindings, to the warp threads. Variations can herewith occur, in dependence upon changes in the pattern. Individual warp thread tensions should be able to be established for the warp threads in the lower and upper sheds. A uniform quality should be able to be maintained in the fabric/blanket irrespective of whether the weft threads zig-zag through every second warp thread or are placed over two or more warp threads before being bound by the subsequent warp thread, and so on. The invention solves these problems.
According to the invention, feedback function(s) working with precision should be arranged for each shaft frame. The control function for the shaft frame or harness should, nevertheless, be able to be arranged individually and/or in coordination with one or more other shaft frames or harnesses. The invention aims to solve this problem also.
Production variances can be present in the weaving machine and its
REFERENCES:
patent: 4827985 (1989-05-01), Sugita et al.
patent: 5170821 (1992-12-01), Yoshida
patent: 5228480 (1993-07-01), Tamura
Falik Andy
Texo AB
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