The document describes a multiphase loom assignment submitted by 6 students. It provides details on the mechanisms of circular and flat multiphase looms. Circular looms use two warp beams, closed reeds to spread the warp circularly, and electromagnetic shuttles that follow a circular path. Flat looms use positive weft carrier drives and rotating reeds for beat-up. The document also outlines features such as medium fabric production and use of split harnesses for shedding.

1. B G M E A U N I V E R S I T Y O F F A S H I O N
A N D
T E C H N O L O G Y

2. A S S I G N M E N T B Y :
1 . M D . J A M A L U D D I N B H U I YA N : 1 4 2 - 0 5 4 - 0 - 1 5 5
2 . E H A S A N Z A M A N H R I D O Y : 1 4 2 - 0 7 1 - 0 - 1 5 5
3 . M U A Z J O H A N I : 1 4 2 - 0 7 2 - 0 - 1 5 5
4 . S A L M A N H O S S A I N : 1 4 2 - 0 5 3 - 0 - 1 5 5
5 . D E W A N S H I K H O N : 1 4 2 - 0 6 0 - 0 - 1 5 5
6 . N I B I R B O S U N I A : 1 3 2 - 0 2 3 - 0 - 1 5 5
Submitted to
Abdur Rouf
Assistant Professor
Dept. of Textile Engineering
BUFT

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.

4. TYPES:
Multiphase looms are two types-
1.Circular Multiphase Loom
2.Flat Multiphase Loom

5. • 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.

6. MECHANISM 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.

8. MECHANISM 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.

9. 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.

11. 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 3.
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.

12. Fig-3:Beat-up Mechanism

13. 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.
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.

15. WEFT INSERTION IN FLAT
MULTIPHASE LOOM:
The Contis C2 and Nuovo
Pignone TZP looms use
positive drive from the roller on
an endless chain track fitting
into the depression in carriers.
 In Ruti 6000 the weft carrier is
driven by reed dents which
applies pressure to the rear
inclined surface of the weft
carriers.

16. BEAT UP IN FLAT MULTIPHASE LOOM:
Beat up is done by
rotating or oscillating
reeds in case of flat
multiphase loom. These
kind of reeds also aid in
the weft carrier drive.

17. CONCLUSION
As a conclusion, the machine that offers highest insertion
rate among all shuttleless loom is multiphase loom but it
has not yet capturing market. This is because it has another
disadvantages which is less versatility, design limitation and
problems in correcting a loose pick at the time of weft break.