Study on under picking mechanism & it's difference between over picking. Calculation of picking force.

Experiment Name: Study on under picking mechanism & it's difference between over picking. Calculation of picking force.

Theory

Picking: Picking is the second primary motion in weaving. The action of inserting weft yarn through the warp yarn is called picking.

Object of the experiment:

1. To learn about secondery primary motion.
2. To learn about side leaver under picking mechanism.
3. To learn about different parts used in this mechanism.
4. To learn about how to calculation of picking force.
5. To make a well report.

Main parts:

1. Side lever.
2. Side shaft.
3. Tappet / cam.
4. Nose.
5. Picking stick.
6. Picker.
7. Shuttle.
8. Shuttle box.
9. Motor.
10. Motor pulley.
11. Rase board.
12. Bottom shaft.
13. Crank.
14. Crank arm.

Fig: Under picking mechanism

Working Principle: Due to motion of circular disk the picking bowl strike on picking shoe. For the strike lever pushed down. The front side of the lever push the elbow of picking stick, the result picking stick move forward and it hit the picker which push the shuttle to insert weft and the pushing force is enough to send the shuttle to opposite shuttle box.

Conclusion: This picking mechanism is very important for loom. In the loom under picking is directly done by picker and picking arm. Again under picking is necessary for weft yarn insertion. So we should learn about this mechanism very carefully.