Patent ID: 6148872
Filing Date: 2000-11-21
Classification: D03D

Abstract:
A method for determining a starting time of the insertion of a weft thread into a loom shed of a jet weaving loom depending on a change in an rpm of a main drive shaft in said jet weaving loom and within a weaving process beginning with a shed opening and ending with a shed closing, said method comprising the following steps:(a) maintaining a constant weft thread flight time (.DELTA.t.sub.F) through said loom shed for all speeds (rpm) of said main drive shaft,(b) determining an angular drive shaft position (.alpha..sub.AR) at which said weft thread shall exit from said loom shed as a function of time (t) to provide a timing control signal,(c) sensing a change in said rpm to provide a trigger signal for applying said timing control signal, and(d) determining with said timing control signal a starting time (t.sub.1 ; t.sub.2 ; t.sub.3 ; . . . t.sub.W) of a weft insertion within said weaving cycle in response to said trigger signal.