lecture 6 (looming)€¦ · 04/08/2016 · o cams are designed according to weave structure o no....
TRANSCRIPT
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Loom Motions
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Loom Motions
Primary
Secondary
Auxiliary
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Prim
ary
mot
ions
Shedding motion
TappetPositive
Negative
DobbyElectrical
Mechanical
JacquardElectrical
Mechanical
Picking motionShuttle
Shuttle less
Projectile
Rapier
Air
WaterBeat Up motionCrank beat up
Cam beat up
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SHEDDINGSeparating the warp threads, which run down the fabric into two layers to form a tunnel known as the shed
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Introduction
o Warp threads are divided into two layers.
o Top layer is called top shed line.
o Bottom layer is called bottom shed line.
o The gap b/w two layers is called shed.
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Objectives
o To raise & lower the healed frames which carry the warp.
o To make an opening for passage of picking media.
o To change the position of warp ends to interlace the warp & weft as per weave.
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Shedding
o Positive sheddingo Raising & lowering of healed frames is with
the help of Double cams.
o Negative sheddingo Lowering of frames is with the help of single
cams & Raising is with the help of reversing media.
o Reversing Mediao The media which brings the frames in original
position, these may be spring, belts & elastic etc.
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Negative Tappet Shedding Mechanism
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Positive Tappet Shedding Mechanism
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Tappet/Cam Shedding
o Healed frames operated by tappet cams
o Cams are designed according to weave structure
o No. of cams depends upon the weave repeat
o Cams are mounted on tappet shaft
o Tappet cam designed for particular weave can not used for other weave
o Storage of cams is necessary in the mill
o Change of cams requires stoppage for long time
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Negative and Positive cam shedding
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Single CamDouble / Conjugate Cam
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Advantage Of Tappet Shedding
o Mechanism is simple.
o Initial cost is low.
o Maintenance is easy.
o No problem of design fault in fabric.
o No speed limitations.
o Plain, simple twill & simple satin can be produced.
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Dobby Shedding
o Healed frames are operated by jacks & levers
o Lifting & lowering of frames is controlled by pattern chain
o It can control up to 32 healed frames depending upon the crank shaft length.
o Design possibilities are crepe , honey comb , huckaback , mockleno , bedfordcord etc.
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Positive and Negative Dobbies
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Disadvantage Of Dobby Shedding
o Mechanism is complicated.
o Initial cost is high.
o Maintenance cost is high.
o Can produce design fault in the fabric.
o Limitation in loom speed.
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Jacquard Shedding
o Warp ends are controlled individually by harness cord
o No of cord = No of ends
o No healed frame
o Pattern possibilities are unlimited.
o Complicated designs may be produced like animals, flowers, geometrical figures etc.
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Disadvantage Of Jacquard Shedding
o Mechanism contains more moving parts
o Initial cost is high
o Maintenance cost is high
o Can produce design faults in the fabric
o Design & cutting pattern cords require skilled labour
o Speed limitations
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PICKING
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Shuttle Loom
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Shuttle Loom
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Projectile
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Rapier (Rigid)
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Single Rapier
Double Rapier
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Rapier (Flexible)
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Air jet Loom
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BEAT-UP
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Secondary motions
Let off
Take up
Auxiliary Motions
Warp Stop
Weft stop