Electrical warp break stop motion

Electrical warp break stop motion is a system used in weaving machines to stop the machine automatically when a warp yarn breaks. In a weaving process, the warp yarns are the vertical threads that are held under tension on the loom, and the weft yarns are the horizontal threads that are woven through the warp yarns to create the fabric.

The electrical warp break stop motion system consists of a sensor that detects when a warp yarn breaks. This sensor is usually a photoelectric sensor that is located near the warp yarns. When a warp yarn breaks, the tension on the yarn decreases, and the sensor detects the change in tension. The sensor then sends a signal to the machine’s control system to stop the machine.

The electrical warp break-stop motion system is used to prevent defects in the fabric that can occur when a warp yarn breaks and the machine continues to operate. When a warp yarn breaks, it can cause the weft yarns to pull too tightly, resulting in a distorted or uneven fabric. By stopping the machine immediately when a warp yarn breaks, the electrical warp break stop motion system helps to prevent these defects.

Overall, the electrical warp break stop motion system is an important component of a weaving machine, helping to ensure the production of high-quality fabrics.

Working principle of electrical warp stop motion:
When the loom runs in normal working condition and the starting handle gets engaged in the slot. Both points of the power supply switch get touched to each other. The warp yarn tension keeps the drop wire in an up position and the top edge of the drop wire don’t get touched with the copper part of the electrode.  The cam mounted on the bottom shaft gets rotated regularly and it imparts up and down movement to the knock off lever but this knock-off lever doesn’t touch with the bar mounted on the L shape lever.
Now suppose that the warp end gets broken, the drop wire falls upon the electrode. As the drop wire falls, the power supply of the solenoid gets on. The solenoid gets energised immediately.  The solenoid magnet attracts the bar mounted on the L shape lever in the upward direction. As this bar lifts up, it comes in front of a knock off lever. The knock-off lever pushes this bar. Since the L shape lever gets connected with the starting handle so that the starting handle is also pushed by the L shape lever. The starting handle gets out of its slot and the contact between both points of the power supply switch get broken and looms gets stopped immediately. 
If a single-acting cam is used, the loom gets stopped after two loom revolutions. The double-acting cam stops the loom after one loom revolution. 

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