Method for controlling weft thread transfer from empty to full bobbin during weft insertion

摘要

A running out weft thread end is transferred from a now empty bobbin to a full bobbin during the insertion of a weft thread into the shed of an air nozzle weaving loom from several thread supply bobbins is controlled to obtain a uniform weave even when the thread supply changes from an empty bobbin to a full bobbin. The transfer of the thread is detected and the respective signal is used to temporarily interpose on in a normal thread travelling pattern, a transitional travelling pattern to eliminate disadvantageous influences that affect the weft thread insertion during the transfer of the weft thread from one thread supply to the next. The transitional travelling pattern begins during or immediately after the detection of a thread transfer taking place. The transitional travelling pattern is maintained for a time sufficient to pull a starting amount of weft thread off from the thread supply or until the thread transit time has reached a rated value. Thereafter, the normal travelling pattern controlled by the weft thread insertion program is resumed.