Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1990-10-26
1992-06-09
Gilreath, Stanley N.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
139452, B65H 5120, D03D 4734
Patent
active
051199980
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for controlling a yarn storage and feeding device, and to a yarn storage and feeding device suitable for performing the above method.
BACKGROUND OF THE INVENTION
According to EP B1 01 74 039, the winding speed at which yarn is wound onto the yarn storage surface is adjusted in accordance with the difference between a predetermined desired value and an actual value of the number of yarn windings supported on the storage surface, and in such a manner, that this difference varies within a limited range between a positive value and a negative value. The desired value corresponds to the number of yarn windings required for satisfying a mean consumption. Although in this case a low winding speed in combination with a low mean consumption results in the creation of a suitably adapted yarn supply, a yarn supply of the same magnitude is not required at higher winding speeds. In the case of a state of equilibrium between the winding speed and the mean consumption, an increase of the yarn consumption at higher winding speeds results in that the yarn supply is replenished at a faster rate than in the case of lower winding speeds, due to the high-speed operation of the winding drive mechanism. An excessive yarn supply is undesirable, however, particularly in the higher winding speed range, because the danger of windings being wound upon one another is increased, and because the winding speed during the replenishment of the yarn supply to an unnecessary size tends to become excessive. Also during the replenishment of the yarn supply to an unnecessary size, the adaptation of the winding speed to a new state of equilibrium after a change of the consumption takes a long time, and excessive speed results in an undesirable increase of the mechanical stress acting on the yarn, involving the danger of yarn breakage, particularly at the yarn supply side. Also the size of the yarn supply can be further and excessively increased, proceeding from the already unnecessarily great yarn supply, in the case of a delay caused by a decrease of the yarn consumption. The great number of windings in the excessively great yarn supply hampers the advance of the yarn supply. The temporarily excessive speed and the mostly excessive yarn supply also result in an unnecessary energy consumption.
It is an object of the invention to provide a method and a yarn storage and feeder device to thereby ensure the presence of a yarn supply of optimum magnitude on the storage surface.
These objects are attained according to the invention by a method and device having the characteristics set forth below.
Both in the case of the method and of the device, the proposed object is simply attained by the consideration that, in the case of higher winding speeds, the winding drive mechanism is capable in response to an increase of consumption of replenishing the yarn supply to the necessary size more rapidly than in the case of lower winding speeds, and that without the danger of the yarn supply being completely depleted, so that the yarn supply can be smaller at higher winding speeds than at lower winding speeds. This is brought about by respective changes of the desired value. In the case of a decrease of consumption, the change of the desired value prevents the size of the yarn supply from being undesirably increased, the selected desired value being effective to adjust the yarn supply to the minimum size required for the reduced consumption. The manner in or the law by which the desired value is varied is at least in part dependent on the capacity of the winding drive mechanism, which may be represented by a known characteristic curve specific to the respective device. This characteristic curve may for instance be the acceleration curve of the winding drive mechanism. The consumption, or the characteristic of the consumption, respectively, is likewise of importance with regard to the variation of the desired value. It is to be preceeded from the assumption, however, that the yarn storage and fe
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patent: 4226379 (1980-10-01), Brouwer et al.
patent: 4298172 (1981-11-01), Hellstrom
patent: 4452402 (1984-06-01), Ghiardo
patent: 4617971 (1986-10-01), Hellstrom
patent: 4676442 (1987-06-01), Tholander et al.
patent: 4687149 (1987-08-01), Riva
patent: 4715411 (1987-12-01), Van Bogaert et al.
Hellstrom Martin J.
Josefsson Par A. T.
Tholander Lars H. G.
Gilreath Stanley N.
Iro AB
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