MOTION IN WEAVING (Warp stop motion):-

WARP STOP MOTION:-

Electrical or electromechanical warp stop motion:-

The electrodes made off three components as shown in the figure. The outer parts of this electrodes is made of iron and the middle part is made of copper strip. Insulation material is used between the iron part and copper part. This is insulation separates both components from each other. It means the electric current does not pass from the outer part to the middle part when the electric supplied. This electrode is inserted through the slot of the drop wire . The warp yarn is drawn through eye of the drop wire. The number of electrode being used depends upon the number of warp ends per inch getting used.

A transformer is used to reduce the power supply. Normally 240 V input is supplied to the transformer. This transformer reduces the supply voltage 12 or 24 volts output is achieved by this transformer.

Fig. Electrical warp stop motion.

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 edge of the drop wire don’t get touched with the copper part of the electrodes. 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 bar mounted on the L shape lever.

Now suppose that the warp end get broken, the drop wire falls upon the electrode. As the drop wire falls , the power supply of the solenoid get on. The solenoid gets energized immediately. The magnet attracts the bar mounted on L shape lever in the upward direction. As this bar lifts up, it comes infront of a knock-off lever. The knock of lever pushes this bar. Since the L shape lever get connected with 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 loom get stopped immediately.

If a single-acting cam is used , the loom gets stopped after two revolutions. The double-acting cams stop after one revolution.

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