The invention discloses a device for sensing end of warp yarn on a circular weaving machine (CWM). It has an improved drop wire and a device to detect the end of a running yarn on a CWM. The device also incorporates an electric circuit which is kept open during normal working of the loom. When a yarn break is detected by a yarn detection means which is also a part of the device, the electric circuit is completed and a notification is sent to the loom operator and the CWM is stopped. The invention is particularly suitable in dusty environment in which CWMs typically operate. The drop wire is provided with an electrically conducting first element having a spatially curved external surface. The device also incorporates a set of electrically conducting second elements having curved internal surfaces. Upon the loss of elevation of the first elements, the first and second elements come in electrical contact with each other, thereby completing the electric circuit and causing a signal to be sent indicating yarn breakage.
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