Textiles: weaving – Warp manipulation – Feeding
Patent
1994-12-05
1996-08-27
Falik, Andy
Textiles: weaving
Warp manipulation
Feeding
D03D 4904
Patent
active
055491405
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for controlling, preferable continously or at close intervals during ongoing weaving, thread tension in a weaving machine, which thread is dependent upon position and/or rotation of one or more beams forming part of the weaving machine.
The invention is applicable to weaving dobbies of various types for example dobbies for forming weaving, blanket weaving, and the like, and dobbies which operate with open and closed sheds, and the like. The invention can advantageously be used on weaving machines which operate with large fabric widths, e.g. 10-30 meter fabric widths.
BACKGROUND OF THE INVENTION
It is known to propose different types of control of the warp thread tension in a weaving machine. By influencing the speeds of the beam or beam concerned, it is possible, where there are tendencies for the warp threads to slacken, to obtain a tendering effect in the thread during certain stages of the weaving.
It is also known to arrange the beam in a spring-mounted disposition, so that a certain positional mobility is obtained in each beam.
It is also known to control weaving machine function by means of computer equipment, which can in this case operate with conventional software for the control system/control in question.
There is a requirement to produce high-quality woven products using rational production processes. Weaving machine manufacturers are faced with high demands regarding the function of weaving machine, which must be performed with a high degree of reliability and must enable simpler operating and handling procedures for staff working at the machines, faster weaving speeds, long working life for the weaving machine, long service intervals, and the like. Added to this is the fact that price pressure upon product development, manufacturing, and the like for the actual machine construction, is being accentuated to a still greater degree. The weaving machine has to work with few operating breakdowns and stoppages.
SUMMARY OF THE INVENTION
The above means, among other things, that recourse must be taken to a refined control function for functional parts included within the weaving machine. The thread arrangement in the weaving machine represents a swinging mass which must be optimally controlled so that weaving machine functions which follow one another in the course of the weaving can be performed in an unbroken and effective sequence. By providing the adaptive beam arrangement the rotations and/or positions of the booms are altered during ongoing weaving, and the thread tension in the warp threads can be kept within predetermined, desired thread tension ranges or essentially constant. The object of the present invention is to propose an arrangement which solves, this problem.
Furthermore there is a requirement to weave with a higher and more uniform quality. The individual thread tensions in the warp threads must be adapted to the binding and/or wrapping pattern between the warp and weft threads, so that the weft function remains essentially the same, irrespective of the pattern. This problem is also solved by the present invention. The adaptiveness of the rotation and/or position of each beam should also be adjusted to different thread material qualities, production variances in the machine, and the like. The invention aims to also solve this problem.
According to the present invention, precise feedback function(s) should be arranged for each beam control. The beams in question should also be controlled with great accuracy, despite a relatively large mass in the beam. The present invention aims to solve this problem as well.
Wear and changes in the internal and external conditions in the weaving machine and in the thread material can also continuously occur. Compensations in the control of the beams and other components in the machines must therefore be continuously carried out. The present invention aims also to solve this problem.
According to the invention, for the control of each beam or for the control of the beams, use should be
REFERENCES:
patent: 3526252 (1970-09-01), Hindle
patent: 4240471 (1980-12-01), Rotrekl et al.
patent: 4619294 (1986-10-01), Sainen et al.
patent: 4817677 (1989-04-01), Deconinck et al.
patent: 5090452 (1992-02-01), Benelli
Falik Andy
Texo AB
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