Method for controlling a yarn processing system and a yarn processing system
AssigneesIngenjoersfirman Elektroteknik IETV AB, Iropa AG
InventorsMagnus Carlsson, Lars Helge Gottfrid Tholander
Life of this patent
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Abstract
The invention relates to a method for controlling a yarn processing system comprising a textile machine, a yarn feed device and a supply spool. According to the inventive method, the yarn feed device pulls the yarn from the supply spool with varying speed and forms and maintains a yarn intermediate store. In addition, a rotatable supply spool (B) is turned at least by the yarn tension elicited by the winding drive (4) of the yarn feed device (F), and the yarn (Y) is tangentially removed from the supply spool (B).
Claims18
A method of controlling a yarn processing system including a yarn consuming textile machine, a yarn feeding device upstream of the textile machine, a rotatable supply spool upstream of the yarn feeding device and a control arrangement which controls a winding drive of the yarn feeding device and regulates the rotational resistance of the supply spool which must be overcome by the winding drive when withdrawing yarn from the supply spool, said method comprising the steps of:
- pulling a yarn off of the supply spool with the winding drive with varying speed to form and maintain an intermediate yarn store which satisfies a yarn consumption demand of the textile machine at any time;
- monitoring the size of the yarn store with a yarn sensor provided in the yarn feeding device;
- controlling an actuation current for the winding drive with the control arrangement by generating run or stop signals for the winding drive based upon signals received from the yarn sensor;
- and
- actively regulating the rotational resistance of the supply spool substantially in synchronism with, speed variations of the winding drive based upon the yarn sensor signals or the run or stop signals with the control arrangement.
A yarn processing system comprising a yarn consuming textile machine, a yarn feeding device disposed upstream of said textile machine and including a winding drive, a rotatable supply spool disposed upstream of said yarn feeding device and positioned relative to said yarn feeding device for a tangential yarn release, said supply spool being rotatable by yarn tension generated during withdrawal of the yarn by said winding drive, a regulating device which varies a yarn releasing rotational resistance of said supply spool, a control arrangement which controls said winding drive to allow the formation of a yarn store on a storage body through withdrawal of yarn from said supply spool, and a yarn sensor disposed to monitor the size of the yarn store and providing signals to said control arrangement which are indicative of the size of the yarn store, the yarn store being of a size sufficient to satisfy a consumption demand of said textile machine but varying in size based upon consumption by said textile machine, said control arrangement additionally controlling said regulating device and permitting communication between a control of said winding drive and a control of said regulating device such that said regulating device varies the rotational resistance of said supply spool substantially in synchronism with speed variations of said winding drive based upon one of:
- a signal provided by said yarn sensor;
- and a signal provided by said winding drive control.
Dependencies are inferred from the claim text.