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Control method and system for weft braking mechanism capable of regulating mechanical tension of yarn in loom automatically

A technology of braking equipment and automatic adjustment, which is applied to textiles, papermaking, textiles, looms, etc., can solve the problems that the yarn tension cannot be accurately controlled and the normal operation of the textile process can be achieved, and the process can be fully stable.

Inactive Publication Date: 2003-02-26
L G L ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Consequently, precise control of the yarn tension and proper functioning of the textile process are not achieved, also because they are subject to unforeseen variations from one picking stroke to the next

Method used

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  • Control method and system for weft braking mechanism capable of regulating mechanical tension of yarn in loom automatically
  • Control method and system for weft braking mechanism capable of regulating mechanical tension of yarn in loom automatically
  • Control method and system for weft braking mechanism capable of regulating mechanical tension of yarn in loom automatically

Examples

Experimental program
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Embodiment Construction

[0025] Referring to Figure 1, SAL is a known system for supplying weft yarn F to a mechanical pick loom TE. The system consists of a reel R0 on which the weft F is wound, a weft supply device P, a weft brake LF placed between the feeder P and the loom TE, for example of the type described in EP622.485 with overlapping plates , and a sensor TM that directly measures the mechanical tension T of the yarn F; said sensor is placed downstream of the brake LF. Known per se, the feeder P comprises a cylinder TA on which a rotary arm BR operated by a motor MO winds and recovers a plurality of yarn coils forming a weft yarn reserve RT. As required by the loom TE, the weft yarn is released from the cylinder TA and passed through the yarn guide GA each time the weft yarn is introduced into the yarn loop.

[0026] Similarly, known per se, the yarn brake LF comprises a fixed plate and a movable plate, between which the yarn and the motor actuator MF are passed. The latter is driven by an ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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PUM

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Abstract

An improved method for controlling electrically operated weft-braking devices, capable of automatically adjusting the mechanical tension of the weft yarn (F) in mechanical-picking weaving machines (TE), is disclosed herein. The excitation current (Ie) of the weft-braking device (LF) is controlled by an adjustment loop (A) using a signal (tens-mis), which is a measure of the actual tension of the yarn, as a feedback signal for the adjustment loop (A). The improvement comprises employing an average value (TMx), which is computed at predetermined intervals (x) of weft picking and for a predetermined number (i) of picking strokes, in order to measure the direct tension of the thread (F), so that said average value (TMx) is substantially stable and not affected by fluctuations due to variations of the parameters of the weaving process.

Description

(1) Technical field [0001] This invention relates to a control method and system for an electronically operated fabric braking device for automatically adjusting the mechanical tension of the yarn in a textile machine using mechanical picking. [0002] More particularly, the invention relates to a system for automatically adjusting the mechanical tension of the yarn supplied to a textile machine, in which the weft yarn is gripped by mechanical means and introduced into the shed. Such machines include rapier and projectile looms, among others, while fluid jet looms are outside the field of the invention. (2) Background technology [0003] As is well known in the weaving process, the weft thread is fed from the reel to the loom through a weft feeder equipped with a manually adjusted entry brake and then through at least one electronically operated weft brake, the two brakes being placed between the reel and the loom between. [0004] The original automatic adjustment system ...

Claims

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Application Information

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IPC IPC(8): D03D47/34
CPCD03D47/34
Inventor P·扎诺尼L·哥提
Owner L G L ELECTRONICS
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