Multiphase loom is a modern loom. I am trying to give the weft insertion mechanism of Circular Multiphase Loom.

1. Welcome To My
Presentation
Presentation ON
“Weft Insertion By Multiphase
Circular Loom”
Sunday, April 19,
2015
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2. Presented By-
NAME:- ID No.
1. Md. Yousuf Hossain. 120103063
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3. Multiphase Loom:
 Continuous weft insertion occurs in multiphase loom.
 Required an ever-changing warp shed, which is
sometimes called wave-shedding.
 There are usually four but occasionally six sets of
sectional harness for each shuttle, and each set
requires a cam unit to drive the harness.
 In circular loom each cam unit is mounted on it’s own
short shaft.
 Since each shaft must be connected to its adjacent
shafts by bevel gears.
 Four sets of harness is required for 2/2 twill.
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Circular Multiphase Loom:
Two beams are used to supply the warp, which passes
round the back rests and is then spread into circular form
by a series of closed reeds. The warp shed is formed
from this point.
Flat Multiphase Loom:
These looms are also unsuitable for the weaving of
continuous filament yarns and they have added problem
of stopping the loom in event of a weft break.
Multiphase looms are two types-
1. Circular Multiphase Loom
2. Flat Multiphase Loom

5. Mechanism (Weft insertion) of circular multiphase
loom:
 Two beams are used to supply the warp, which passes
round the back rests and is then spread into circular
form by a series of closed reeds.
 The warp shed is formed from this point.
 A series of electromagnetic blocks is rotated on a
motor driven main center shaft. The electromagnets is
prevented by the intervening warp shed, which is
tensioned and thus supports the shuttle.
 The shuttle is also supported by the fixed reed that
holds the warp ends at the desired spacing.
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6. Mechanism (Weft insertion) of circular multiphase
loom:
 Beat-up is achieved by a spiked wheel mounted on an
antenna trailing behind the shuttle.
 The spikes pick up the trailing weft and finally press it
into the cloth fell.
 The work of the temple is done by a fixed ring, which
prevents early contraction of the cloth.
 The take up motion is mounted in a high position and
the loom thus require a lofty room or space on two
floors, one above the other.
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2015
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8. Electromagnetic shuttle drive:
 An arrangement showing eight shuttles equally spaced
round the loom is shown in fig 2. The appropriate
positions of 32 pairs of harness are included.
 The continuous lines represent the harness that
controls one set of alternate ends (odd end) and the
dotted lines show the position of the other (even) end.
 The electromagnets attract the metal shuttles, which
thus follow the magnets in a circular path.
 Attraction of the shuttles into physical contact with the
electromagnets is prevented by the intervening warp
shed, which is tensioned and thus supports the shuttle.
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9. Wave shed and electromagnetic shuttle drive-
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10. Rack and pinion shuttle drive:
• The harnesses operate vertically and in front of the
reed.
• A series of rotating pinions is situated round the loom.
• These pinions engage with a rack on the underside of
the shuttle, which is thus traverse round the loom.
• The teeth in the pinions are so shaped that the ends in
the bottom warp sheet easily rest in the clearance area
between the teeth and pegs in the shuttle rack.
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11. Rack and pinion shuttle drive-
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12. Beat-up Mechanism:
Beat-up is achieved by a spiked wheel mounted
on an antenna trailing behind the shuttle.
The spikes penetrate the warp sheet as shown in
figure 4.
This causes the wheel that is mounted on the
antenna arm to turn so that the spikes pick up the
trailing weft and finally press it into the cloth fell.
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13. Beat-up Mechanism-
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14. Features Of Multiphase Circular Loom:
 Heavy reciprocating parts and a precision system of
shuttle.
 Medium and coarse fabrics are produced.
 Metallic shuttle propulsion by magnetic block and
pinion.
 Wave shed is produced and shed is vertical.
 Heald frames are horizontal.
 For plain weave 32 harness are used.
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15. Features Of Multiphase Circular Loom:
 In circular loom 8 shuttles may simultaneously be
employed for weaving.
 Split harness are used for shedding.
 Complete rotary motion is in line with weft knitting
machine.
 Reed is fixed and it controls the warp spacing.
 Rotating spiked wheel is used for beating up.
 Multiple warp beam are simultaneously used.
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16. Thanks
Everyone For
Watching My
Presentation
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