Winding – tensioning – or guiding – Tension control or brake – Take-up coil drive control
Patent
1995-04-10
1998-04-21
Mansen, Michael
Winding, tensioning, or guiding
Tension control or brake
Take-up coil drive control
242 36, 242 431, B65H 6300, B65H 5428
Patent
active
057409811
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method of winding a yarn to a cross-wound package in random wind.
Such a winding method is known, for example, from U.S. Pat. No. 4,245,794.
In the winding of yarn to cross-wound packages, in particular at high takeup speeds, the angle of deposit and the crossing ratio are important factors along with the progression of the yarn tension during the takeup, for the stability of the package, the avoidance of ribbon formation, as well as the satisfactory unwinding property of the package in further processing, and its transportation. It is therefore attempted in general to prevent, if possible, deviations in the yarn tension from empirically favorable settings, in particular also when suppressing a ribbon formation. On the other hand, it is known that the yarn tension increases during the winding process, as the package diameter becomes larger and, as a rule, mostly in an undesired manner, unless measures are taken, which counteract an increase in the yarn tension.
In a random wind, the yarn is traversed over the package surface during the winding cycle at a substantially constant traverse frequency, which leads, at a substantially constant advance of the yarn, to constant angles, at which the yarn is deposited on the package surface. A random wind is distinct from a precision wind, wherein spindle and the drive of the yarn traverse mechanism assume mechanically or electronically a ratio, which is preset constant, and not formed by whole numbers. Also, in the case of a precision wind, the angle of deposit decreases steadily, as the package diameter increases.
Measures of influencing the progression of the yarn tension during the takeup are known from the art, for example, from the above-mentioned U.S. Pat. No. 4,245,794.
The method described in this patent includes, between the yarn feed godet and the inlet end of the yarn traverse mechanism, a yarn tension converter and a rotating pulsation device, which is controlled as a function of the traverse speed. According to the winding process to be carried out on the apparatus, the pulsation device is to equalize the yarn tension fluctuations caused by the traverse mechanism substantially in that it causes the yarn to deflect, synchronously with its traversing motion, from its straight-line path to both sides. The yarn tension converter provided in the path of the yarn upstream of the pulsation device is intended to convert changes in the yarn tension, which are in particular caused by the increase in the package diameter, into control pulses for influencing the spindle speed, so that an increasing yarn tension is counteracted by a lowering of the spindle speed, and vice versa.
However, this results in that as a function of the yarn tension progression, also the angle of deposit and the crossing ratio are changed in an unforeseeable, undesired manner.
It is the object of the invention to control the yarn tension without influencing the crossing ratio and the angle of deposit.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by a random winding method which includes advancing the yarn at a substantially constant speed to a stationary yarn guide, traversing the advancing yarn at a location between the stationary yarn guide and a rotating yarn bobbin so as to form a cross wound package on the rotating bobbin, and generating basic control signals for the traversing speed and the rotational speed of the package respectively such that the yarn is deposited on the package at crossing angles which are substantially constant during the build of the package. In addition, the tension of the advancing yarn is sensed at a location upstream of the stationary yarn guide and a tension signal is produced which is representative of the sensed tension. The tension signal is superimposed upon the basic control signals to produce final control signals for respectively controlling the traversing speed and the rotational speed of the package such that the traversing speed a
REFERENCES:
patent: 3931938 (1976-01-01), Hasegawa et al.
patent: 4245794 (1981-01-01), Hasegawa et al.
patent: 4394986 (1983-07-01), Hasegawa et al.
patent: 4458849 (1984-07-01), Miyake et al.
patent: 4494702 (1985-01-01), Miyake et al.
patent: 4504024 (1985-03-01), Gerhartz
patent: 4697753 (1987-10-01), Schippers et al.
patent: 4779813 (1988-10-01), Sugioka et al.
patent: 4830296 (1989-05-01), Ueda et al.
patent: 5141169 (1992-08-01), Sugioka
patent: 5348238 (1994-09-01), Yamauchi et al.
Barmag AG
Mansen Michael
LandOfFree
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