Method for detecting the almost complete consumption of a shuttle thread by identifying a knot formed on the thread, and capsule/case assembly with adapted shuttle and its implementation

摘要

When winding the shuttle thread 4 onto a shuttle 3, a knot 20 is formed on this thread at a predetermined distance from its end at which winding was begun and, when using the shuttle thread during sewing operations, with the elastic tension strip 14 of the shuttle case 2 normally electrically insulated with respect to the capsule 1 surrounding this case 2, the potential difference V between this elastic strip and this capsule is monitored 15 and the moment at which this strip, driven by the knot 20, bends radially towards the capsule until, by electrical contact, it cancels out this potential difference is identified. <IMAGE>