Modern looms still weave by repeating in sequence the operations of shedding, picking, and beating. In weaving technology, modern looms means shuttle less loom. Air jet and Rapier both are performed automatically with high production and commonly used in Bangladesh.
10. Cam
• used to convert
the rotary motion
of shaft to
reciprocating
motion
• entire cam
arrangement is
placed on an oil
bath
• Cams are
supported by
guard cam for
safety
Various Types of Cam
11. Wheel lever, Short lever & Long Lever
• Convey the reciprocating motion
• drive the heddle frame
• two sets of link carrying the drive bracket are
pivoted on each side of long lever
• brackets allow easy mounting and dismounting of
harness frame
12. Harness Frame
Features:
– Glued heddle rod
– Lightweight Aluminium profile
– R-flex corner connection system
– Integrated heald dumper
– Stainless steel corner reinforcement.
Brand : GTP
Mode
l
:
XLF extra
Light 152
14. Cam Shedding Mechanism
• According to pattern cams are added and
adjusted to their respective position
• As the camshaft rotates cams also rotate
• When the bowl is pressed, the wheel lever swing
upward
• Via long lever, harness frame is pushed upward to
its upper position
• Again after cam nose has passed the bowl, the
harness is pulled to its bottom position
• It is a positive shedding mechanism
15. ELSY
• Stands for Electronic Leno
Selvedge System
• Don’t need any extra heald
frame to make selvedge.
• Laws of motion can be
changed without hampering
the fabric quality.
• Shed crossing can be set as
required.
• Selvedge weave can be
inputted differently.
• Used for selvedge and false
selvedge.
• Selvedge Type: Fringed
16. Mechanical Leno
• Selvedge Type: Leno
type
• A simple hook
mechanism
• Needs to incorporate
with ELSY to produce
binding weave in the
fabric edge.
20. Main Parts of Picking
Prewinder:
– Type: Luna X2
– Pre wind yarn on drum from
package
– Supply the required length of yarn
at required tension for weft
insertion
21. Main Parts of Picking
• Filling Presenter:
– lower the appropriate filling
yarn so that it can be taken
by gripper head
• Filling Cutter & Wastage Cutters
– Filling Cutter Cuts the inserted weft yarn
after beat up
– Wastage Cutter Cuts the excess length of
weft yarn outside the fabric edge
22. Main Parts of Picking
• Gripper & Receiver heads
– Carry the weft yarn
• Suction heads
– Prevents bouncing back of
inserted yarn
23. Mechanism of Picking
• Yarn presenter is lowered to
present the thread
• The gripper head catches the
yarn
• Both the gripper and receiver
proceed towards the middle of
shed
• The yarn is then transferred
from gripper head to receiver
head
• The receiver head then drags
the yarn through the rest of
the shed
• Finally the filling cutter cuts
the thread
Gripper head is carrying the weft
Weft is transferring from gripper to receiver
Weft is transferred
Receiver is carrying the weft
24. Hook Opener
• The gripper opener: Opens
the gripper clamp to facilitate
lint removal
• The receiver opener: Opens
the receiver. Its position is
critical so that it opens the
hook at the exact time of
weaving cycle
25. Rapier Track
To prevent rapier slippage a rapier track is made with
hooks
This hooks do:
– The minimization of the gripper sole wear.
– The break of the gripper.
– The reduction of the filling stops
26. Rapier Drive Mechanism
Rapier driving arrangement
consists of:
• Main shaft
• Rocker arm
• Oscillating link
• Drive lever
• Adjustable link
• Conical Toothed segment
• Rapier driving pinion
• Rapier wheel
29. Beat up mechanism
• Cam beat up
• No of Cam: Two on each side
• Beat up angle: 0o
Main Parts
o Sumo motor (Main Motor)
o Motor gear & Drive wheel gear
o Beat up cam
o Sley
o Reed
30. Main Parts of Beat Up
Beat up Arrangement
Bowl
Cam Gear
Gear train from main Motor
31. Main Parts of Beat Up
Reed
• Attached with sley
• Push the newly inserted
thread to fell
• Plain reed is used in rapier
32. Beat Up Mechanism
• main motor rotates the
drive shaft
• This rotation is
converted to
reciprocating motion in
sley
• The reed is fixed with
sley
• As a result, it pushes the
newly inserted pick to
the fell
34. Let off Mechanism
• Servo motor aided let off.
• Speed of let off motor
gradually increases with
the decrease of beam
diameter.
• Main Parts
– ELO Motor
– Reduction wheel
– Gear box
– Let off wheel
35. Main Parts of Let Off
ELO Motor
Let off wheel
Beam collar
37. Take up Mechanism
• Servo motor aided take up
• Batcher mechanism
• Main Parts
– ETU Motor
– Gear train
– Take up roller
– Spreader
– Double pressure roller
– Guide roller
– Batcher
39. Wastage winder
• Used to wind
up wastage and
excess warp.
• One gets drive
from let off
gear (for warp).
• The other one
from take up
wheel
(wastage)
Wastage winder (wastage take up)
Wastage winder (Excess warp take up)
41. Warp Stop Motion
• Electrical drop wire mechanism.
• If a warp is severed drop wire falls
on contact bar and complete the
circuit which stops the machine.
• Main parts:
– Drop wire.
– Contact bar.
– Guide bar.
– Main circuit (Circuit box)
43. A MODERN AIRJET LOOM
Keyword: General features, main parts, motions, shedding, picking, beat
up, let off, take up, warp stop motion, weft stop motion, others stop
motion
45. Picanol Omni Plus (Airjet Loom)
Name : Picanol Omni Plus
Type : Airjet Weaving Machine
Machine Weight : 1900 Kg
Maximum Speed : 850 RPM
Attachments :
E- Leno
AIC (Adaptive Incretion Control)
PFT (Programmable filling tensioner)
Sand Roller
Circumference
: 534 mm
Shedding
Mechanism
: Positive cam shedding
Cam arrangement : Outside cam arrangement
Cam Manufacturer : Staubly
46. Main Parts
• Bobbin break sensor
• Pre-winder (weft Feeder)
• Balloon Breaker
• PFT
• Main nozzle (Fixed & Movable)
• Relay nozzle
• Weft cutter
• Waste cutter
• Filling detector
• Pressure control regulator
• Cam with cam box.
• Lever and Puller.
• Reed.
• Easing arm
• Back rest
• Take up roller
• Cloth roller
• Catch Cord
• Disk type tensioner
• Drop wire and Dropper bar.
• Leno selvedge attachment (e-
Leno)
• Temple
• ELSY (Electric Leno Selvedge
System)
• Batcher
• Waste winder
47. Main Parts
• Electrical boards
• MCB
• AIB
• TRIAX-2
• WEB X
• DDMP
• LDEC
• FDCB
• PB
• Various motors
• Sumo Motor
• Hydraulic Motor
• Cutter Motor
• ELCA Motor
• ELSY Motor
• PFT Motor
• ETU Motor
• ELO Motor
• E-leno Motor
48. Motions
• Primary motions
– Shedding
– Picking
– Beat Up
• Secondary motions
– Let off
– Take up
• Tertiary Motion
– Auto Warp stop Motion
– Auto Weft stop Motion
– Batcher motion
– Brake motion
52. Shedding Geometry
Conversion Table of Shedding angle
Here “α” between 22° to 26° used for filament yarn
28° to 34° angle used for spun yarn weaving.
53. Shedding Geometry
Shed Height
The optimal height setting depends on a number of factors:
The article type
The weave
The machine speed (rpm).
55. E-Leno
• Produce leno selvedge
for edge binding.
• Two leno box, one for
each side.
• Drive by a single motor
(Omni plus) or separate
motor (Omni plus 800).
• Each box support two
leno bobbin, these two
bobbins are rotated in a
circular path to produce
a one up one down leno
selvedge.
58. Weft passage
Creel : Supports the cone.
Disc-
Tensioner
:
Add a tension on yarn
which is being unwounded
by pre-winder.
Bobbin
break sensor
:
Detects yarn breakage
between creel & Pre-
winder. Incorporated with
pre-winder.
Balloon-
Breaker
:
Prevent large balloon
formation which leads to
yarn breakage.
Incorporated with pre-
60. Prewinder
• The pre-winder contains
the following components:
– The motor and control unit
– The drum with 7
independently adjustable
fingers
– The magnetic winding
blocking unit for controlling
the filling length
– The yarn-supply sensor
– The positioning sensor
– The winding sensor
– The bobbin break sensor
– PFT used to stretch the
floating filling inside the shed.
62. Nozzles
• Relay nozzle
– Total No of relay nozzles
28.
– Divided into 2 groups.
– Left (Contain 14 nozzles).
– Right (Contain rest of the
nozzles).
– Contains 1 to 17 opening
(holes) for air supply.
63. Nozzles
• Relay nozzles should be set as
high as possible to clear the
relay nozzle openings earlier
when entering the shed, and
keeping them clear longer
when leaving the shed.
• The more the relay nozzle is
turned towards the reed, the
higher the yarn flight in the
insertion channel.
• The height of the relay nozzle
is critical, if it is low, the flight
of the filling will be low, if the
height is very high it will leave
nozzle mark on fabric.
64. Air Supply accessories
• Buffer tank for relay nozzle
– Left Buffer Tank
– Right Buffer Tank
Main nozzle modules and valve
65. Air Supply accessories
Relay valve
Each valve controls 1 or 2 (Maximum
three) relay Nozzles.
Pressure regulator
66. Filling Cutter
• Filling cutter cut the yarn
after each filling and
start a new filling
insertion cycle
• Generally, at 10° position
the cutter cut the yarn.
67. Requirement of air supply for picking
• Main line pressure
– 7 to 9 Bar Required
• Main valve pressure
– Up to 6 Bar
• Auxiliary valve pressure
– 5 to 6 Bar (Fixed)
• Left relay valve pressure
– Up to 5.5 Bar (Depends
on weft yarn Count &
M/C RPM)
• Right Relay valve
pressure
– Up to 0.5 Bar more than
left relay valve pressure
74. Weft stop motion
Device
used
: Filling
detector
No of FD : 2 (FD1 &
FD2)
Mechani
sm
: Laser based
Stop
signal
: If the thread
does not
reach FD1
If the thread
reach FD2
75. Weft stop motion
• Mechanism
– FD is constructed with a
light emitting diode and
photo electric sensor.
– The filling yarn interrupt
the continuity of light
and photo electric
sensor convert it into an
electronic signal.