Experiment Name: Study on side lever under picking
mechanism.
Theory: Picking is the second of the primary motion of
weaving. The object of picking is to insert the weft yarn through the warp
shred during weaving. It consists in passing a pick of weft between the upper
and lower lines of a divided warp. In side lever under picking mechanism, a circular disk carrying a bowl is driven by
the bottom shaft and the picking stick is held in position outside the loom frame.
The term under pick mechanism means the picking stick moves from the bottom of
the box and pivot of the stick is placed below the box.
Objective:
1) To learn about side lever under picking mechanism.
2) To learn about different parts used in this mechanism.
Figure:
Related Machine parts:
- Bottom shaft
- Circular Disk
- Picking Bowl
- Picking Shoe
- Side Lever
- Pivot
- Guide
- Elbow
- Picking Stick
- Returning Spring
- Rocking Shaft
- Buffer
- Picker
- Shuttle Box
Construction:
1) the circular disk received motion from the bottom shaft.
The disk contain a bowl named picking bowl able to push down the picking shoe
of side lever.
2) Side lever of loom pivoted with loom frame and the
up-down motion of side lever is controlled by fixed guide.
3) Side lever is connected with elbow of picking stick which
attached with returning spring on the top
of rocking shaft.
4) Each picking stick contains picker which push the shuttle
through the passage.
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.
Calculation:
Speed of bottom shaft :
(960 X 3 X 38) / (24 X 76)
= 60
There are two picking mechanism : PPM = 2 X 60 = 120
Result : 120 PPM
Conclusion :
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