Picking faults

Picking faults :

I)           Early picking

II)         Late picking

III)      Smash/Banging-off

IV)      Short picking

V)        Harsh picking

VI)      Shuttle flying picking

I)   Early picking:

Incase of early picking, the shuttle enters into the shed a little earlier. This gives the shuttle more time to travel across the sley race. This occurs before the completetion of shedding. An earlier pick gives loss of power broken selvedges, as the shed is not sufficiently open for the entry of the shuttle.

II) Late picking:

Incase of late picking the shuttle enters the shed when the going part of the loom is nearer to back centre. This occurs through the shedding is completed. Late picking will cause weft stitches, broken selvedges and loom knocking off jerkey motion of the loom.

III)          Weak picking:

When insufficient force is applied to the shuttle box to reach the opposite box, called ‘weak pick’. Weak pick may be due to slack picking band, loose picking stick, worm nose piece, insufficient power.

Weak pick causes- loom knocking off, Broken selvedge thread and stitching at the side.

IV)      Banging-off/Shuttle trapping in shed/Smashing:

Causes due to-

·         Entangled warp ends

·         Late or weak pick

·         Worn out picker

·         Wrong timing of boxes

·         Boxes moving too slow

·         Boxes not steady when pick is delivered

·         Swell spring broken

·         Loose guide plates

·         Shuttle rebounding/trapping after entering a box

V)        Harsh picking:

When more force is applied to the shuttle than required to pass the shed, the pick becomes harsh.

Harsh picking may be due to-

·         A new picking tappet nose

·         Prominent curve of nose

·         Strong pick

·         Broken cone stud

It will cause-

·         The shuttle to rebound

·         Given broken cops

·         Cracked shuttle

·         Broken ends

·         The picker may be damaged

VI)      Short picking:

This defect arises due to-

·         Unsuitable angle

·         Setting of picking

VII)   Shuttle flying out:

It causes due to

·         Hollow race board

·         Unclear shed obstracting the path of shuttle

·         Pickers or shuttle are worn out

·         Wrong setting of shuttle and picker

·         Shed are too high or too low of the race board

·         Flacturation in power supply

·         If the slay stands higher at one side than the otherside

·         Wrong alignment of sley race and back of the shuttle

·         Loose nose place, cone stud or loose picking bowl

·         Reed and shuttle box back are not properly in line and beveled