Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1984-02-06
1985-04-30
Jillions, John M.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 356R, 340679, B65H 5420, B65H 6300
Patent
active
045139210
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method and an apparatus for detecting fluctuations of the monitoring standard of a thread-knotting monitor in an auto-winder used in a winding process of a spinning mill.
BACKGROUND ART
In the winding process of present-day spinning mills, wide use is made of auto-winders with automatic thread-knotting machines. Among these auto-winders with automatic thread knotting machines, auto-winders with movable automatic thread-knotting machines, such as the auto-winder made by Schlafhorst GmbH of West Germany, have taken the lead among auto-winders with automatic thread-knotting machines because of their superiority in the quality of the wound thread package, their reliability of operation, and their economy.
In an automatic thread-knotting machine, a broken thread is mechanically knotted and the knotted thread is immediately wound. Therefore, in comparison with an ordinary knotting method in which the thread is wound after the configuration of the thread knot is confirmed, there is a larger probability of inferior knotting in a thread knot in an auto-winder, e.g., doubling of two threads in knotting (below, "two-plied thread"), intermixing of waste thread in knotting, and irregular lengths of ends of knotted thread. The winding process is the last process in the thread-producing process, therefore, the above-mentioned inferior knotted portion is not removed in subsequent processes but is maintained as is in the thread package and supplied to the knitting process or weaving process. In present knitting processes or the weaving processes, 80% of all defects are caused by inferior thread-knotting portions in the above-mentioned winding process. Use of thread from which the inferior knotting portion is not removed decreases the product yield due to the increased rate of inferior fabric. Further, use of the inferior fabric for the finished goods decreases the quality of the finished goods.
To prevent occurrence of inferior thread knotting in the winding process during the winding process itself, automatic thread-knotting machines of recent auto-winders have been provided with thread-knotting monitors. A thread-knotting monitor is comprised of an optical device having a light-emitting element and a light-detecting element or an electrostatic-capacity measuring device for measuring the fluctuation of electrostatic capacity; a comparator for comparing the signal emitted from the measuring device with a predetermined value; and a device for cutting the thread which began to run after receipt of a signal from the comparator. The monitor is arranged adjacent to a thread-knotting mechanism of the automatic thread-knotting machine. That is, the measuring device of the thread-knotting monitor is arranged downstream of the thread-knotting mechanism in the direction of thread advance and detects the thickness of the running thread. When inferior knotting occurs and the thread continues to run as it is, the thickened thread-knotting portion is measured by the measuring device, and the comparator, in which a predetermined value, i.e., a monitoring standard, is set, compares the thickness of the thread-knotting portion with the monitoring standard. When the thickness of the thread-knotting portion is larger than the monitoring standard, the comparator emits a signal to the thread-cutting device. Thus, use of this known thread-knotting monitor enables a large reduction of inferior thread-knotting portions in a thread package. Now, a controller for adjusting the monitoring standard to set the monitoring standard to correspond to the thickness of the thread used is provided with the thread-knotting monitor.
While the above known thread-knotting monitor performs excellently to detect and remove inferior thread-knotting portions, it conversely has the following disadvantages. That is, in the measuring device used in the thread-knotting monitor, the monitoring standard tends to fluctuate with the passage of time. Further, even if the measuring device fails in operation, no means is provided
REFERENCES:
patent: 3294326 (1966-12-01), Raasch
patent: 3458912 (1969-08-01), Werffeli
patent: 3646542 (1972-02-01), Anthony
patent: 3648027 (1972-03-01), Ganong, Jr. et al.
patent: 4319720 (1982-03-01), Ueda
Imoda Kinichiro
Kawai Toshinori
Nishitani Kimio
Aichi Spinning Co., Ltd.
Jaekel Katherine
Jillions John M.
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