September 02, 2019
Every manufacturer wishes to extend the highest quality of fabric to its stakeholders. Hence, they conduct a supervision of the warp threads that is an essential factor to ensure fabric quality. The device used to accomplish this task is called warp stop motion; it halts the running of the weaving machine if there is any thread breakage or even if the thread becomes slack, the tension level reduces below the normal level. The tension reduction is often noted during the processing of delicate fabric materials.
The oldest and most traditional equipment of this process is mechanical stop motion machinery.
Mechanical Warp Stop Motion
The principle of operation of a warp stop-motion is not very widely practised in this day and age. The outer rack of this device is fixed, however the inner is movable. The inner rack sets into reciprocating motion within the fixed rack. If a thread breaks, then the vane drops and falls between the teeth of the racks which stops the motion of the movable rack and shuts the loop.
However, in this day and age of data validation, the mechanical wrap motion system is endangered as the process of data detection becomes highly tedious and labour intensive.
Electric Warp Stop Motion
This mechanism is widely equipped in the textile industry. Here, the warp thread is passed into the bottom slit of a metallic drop wire, which is supported by the thread under tension. Through the top slit of the drop, the wire passes the contact rail composed of a U-shaped outside coating in stainless steel, of a strip of insulating material and of a flat conductive inside blade in nickel-plated copper which is situated on the upper part with a toothing. This solution speeds the process of finding the broken thread and allows an automatic analysis of the warp stops through a functional data detection system.