It is defined as the process of inserting weft yarn through the shed. It is the second Primary motion in weaving.
The objective of picking:
The objective of picking is to propel the weft carrying element or the weft yarn along the correct trajectory maintaining requisite velocity through the shed in order to provide lateral sets of yarn in the fabric.
Type of picking mechanism:
Negative/conventional Picking mechanism.
Semi-Positive Picking mechanism.
Positive / Unconventional picking mechanism.
Negative/conventional Picking Mechanism:
In this mechanism, the shuttle is used as a carrier and the weft yarn placed in it is called pirn.
Functions of Negative picking:
To deliver the shuttle along the correct flight path.
To project the shuttle at a Predetermined velocity.
Types of Negative picking:
Semi-Positive Picking Mechanism:
In this mechanism, the weft carrier travels into the shed through a weft carrier guide. Projectile loom is an example of a semi-positive picking mechanism.
In this type of picking the weft carrier is controlled mechanically i.e., air, water, needle, or rapier.
In this type of picking mechanism, the picking arm position is situated above the shuttle box then it is known as over pick.
In this type of picking mechanism, the picking arm position is situated Under the shuttle box then it is known as Under pick.
Difference between Over pick and Under Pick
The Picking arm is situated above the shuttle box
The Picking arm is situated below the shuttle box
Looms with Over pick has higher speed
Looms with Under pick mechanisms has Low speed
Looms with Over pick will consume less power
Looms with Under pick mechanism will consume high power
Looms with Over pick mechanism runs smoothly
Looms with Under pick mechanism runs less smoothly compared to Over pick looms
It is the less clean mechanism
It is the more clean mechanism
Looms with Over pick mechanism has less wear and tear
Looms with Under pick mechanism will have more wear and tear
This mechanism possesses gentle picking action
This mechanism possesses Harsh picking action
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