Textile machine with yarn feeding control

Abstract

A textile machine comprising a main shaft (10) to be driven in rotation, and a sensor (20) to detect at least one angular position (PA) of said shaft and generate a corresponding reference signal (SR); the machine (1) further comprises weaving members (30) to make a textile product (30), at least one beam (50) on which a yarn (60, 61, 63, 64) to be fed to the weaving members (30) for manufacture of the textile product (40) is wound, and actuating means (70) to drive the beam (50) in rotation and unwind the yarn (60, 61, 63, 64). The machine (1) further comprises control means (80) connected to the sensor (20) and the actuating means (70) to move said means depending on the reference signal (SR).

Description

technical field [0001] The invention relates to a textile machine for yarn feed control. Background technique [0002] Various types of textile machines are known, such as belt hook knitting machines, belt knitting machines and double-bed warp knitting machines, which have a plurality of weaving elements fed with appropriate yarns and which, by moving them in synchronization with each other, can Get pre-ordered textiles. [0003] The yarn supplied to the weaving elements may be unwound from a roll positioned near the textile machine, generally called a "beam"; with the aim of optimizing the operation of the machine and the quality of the finished fabric, control system to regulate the rotational speed of the weaving beam, said regulation being especially aimed at maintaining a constant tension of the yarn used and avoiding yarn breakage. [0004] In more detail, said textile machines of known type have one or more sensors to detect the tension of the yarn fed to the weavin...

AI Technical Summary

Problems solved by technology

[0005] Thus, if for example a high tension is detected, the rotational speed of the beam is increased in order to meet the mechanical "demand"; if, on the contrary, a low tension is detected, the rotational speed of the beam is reduced to prevent mechanical inefficiency Feeding excess yarn, resulting in reduced quality of the finished fabric

[0006] However, the control system briefly described above has a different operational drawback

[0007] First, the speed of rotation of the weaving beam does not take into account the type of product being produced, and it is not synchronized with the movement of the weaving elements designed to produce the finished fabric; thus the quality of the finished fabric is greatly compromised

[0008] Additionally, with rapid changes in tension in the yarn (for example due to a large span of one or more weaving elements), a control system that uses the yarn tension as a reference parameter may not be responsive enough to keep up with the changes

[0009] Therefore, the actual risk of one or more yarn breaks due to the rapid movement of the weaving elements cannot be ignored, which would impair the operation of the complete machine and the quality of the finished fabric

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