Determining position of warp yarn break in weaving loom by yarn rider - where dropping rider connects electrodes with both ends connected to voltage to give currents in 2 circuits

摘要

The method is intended for determining the position (x) of a warp yarn break in a weaving loom provided with a warp monitor consisting of a contact element (1) formed by two parallel electrodes (2,3) and riders (4) which are suspended from the respective warp yarns and drop on to the element in the even of a break to make contact between the electrodes. A voltage differential (U) is maintained (7,8) between the electrodes at either end (5,6) such that, in the event a rider drops, two current circuits (5,2,4,3; 6,2,4,3) arise. The magnitude of the respective currents (I,I') is directly or indirectly determined (9,10) and the position (x) of the dropped rider is computed (13) therefrom (and indicated 14). - At least one of the electrodes pref. has a significant resistance (5k ohm - 1M-ohm), pref. around 10% of the normal contact resistance between a rider and the electrodes.