2. picking
Picking is the next process after shedding in the sequence of
primary motion . It consists of passing of weft thread through
the shed of warp threads.
Objects of picking
The main object of any conventional picking where fly shuttle
is used as a weft carrier are as follow :-
To deliver the shuttle along the correct flight path.
To project the shuttle at a predetermined velocity.
3. The objects can be achieved by doing
following arrangements:-
• The shuttle box back and the reed are in perfect
alignment.
• The shuttle box base and the race-board are in perfect
alignment.
• The shuttle delivered satisfactorily by the picker.
Otherwise there may be chances of shuttle fly off or trap.
4. Type of picking motion
Cone Under Pick Side lever under Pick
Motion Motion
Over Pick Motion Under Pick Motion
5. Comparison between (u/p)&(o/p)
Subject Under Pick
(U/P)
Over Pick (O/P)
1)Position of
picking arm.
2)Speed of
loom
3)Size of loom
4)Power
consumption
.
Just below the
shuttle box .
speed of loom is
lesser
use for board &
mediam m/c.
more power
consumption.
Just above the
shuttle box.
greater
use for narrow
loom.
less power
consumption.
6. 1
Subject Under Pick (U/P) Over Pick (O/P)
5) Fabric
woven
6) Oiling and
maintenance.
7) Noise
produce.
Use for wvg.
Heavy fabric &
also used in silk
and rayon .
No need of oiling
spindle .
More noise
Use for wvg.
medium & light
weight fabric.
Oiling of
spindle is
required.
Less noise
7. construction
• A wooden side lever ‘A’
fulcrummed at 0.
• A picking shoe ‘B’ is fixed on
the side lever.
• A wooden picking stick ‘C’ is
fixed to an iron shoe ‘D’.
Now here
the forward side lever is
above the shoe.
• The picker ‘E’ is loose on the
picking stick and is guided
8. Under pick motion :
In this motion the picking is done by the help of a
picker from the underside of the warp sheet.
Principle :
It is based on the principle of to and fro motion given
by the rotary motion of the bottom shaft. In this the
picker is mounted on a picking stick which gets
movement from the side lever and bottom shaft.
9. Side lever under pick
motion
Simplest motion use for weaving all fabrics.
All the parts fitted outside of loom so its
maintenance is easy .
11. :The main parts which are responsible for
picking is the bowl and picking shoe. The
bowl is situated at rotary disk which is
fixed on bottom shaft. Due to revolution
of bottom shaft , disk revolves so bowl
will also revolve . When bowl comes in
contact with the picking shoe then it
presses the picking shoe, due to this
action the side lever which are made of
wood are pressed down which depresses
the iron shoe. By this motion transfer, the
picking stick moves in forward direction.
Due to this it will give the motion to the
shuttle with the help of picker.
When shuttle is passed the picking arm
comes to original position with the help of
spiral spring placed beside the iron shoe.
The same assembly is situated at another
side for insertion of next pick
Working
