Transcript AIR JET WEAVING - Government Polytechnic,Nagpur

AIR JET WEAVING
DEFINATION:
AIRJET WEAVING INVOLVES INSERTING A
PREDETERMINED LENGTH OF YARN THROUGH
THE WARP SHED BY MEANS OF COMPRESSED
AIR.
DIFFERENT SYSTEM OF AIR JET WEAVING
1. SINGLE NOZZLE WITH CONFUSOR TYPE GUIDE
2. MULTIPLE NOZZLES WITH GUIDES
3. MULTIPLE NOZZLES WITH A PROFILE REED
( WIDELY USED IN MARKET)
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING
MACHINE (TSUDAKAMA JAPAN )
1. DRIVE : DRIVE IS GIVEN BY 3.7 KW
MOTOR BY MEAN OF COMBINED V BELT
& ELECTROMAGNETIC CLUTCH
TRANSMITS DRIVE TO MAIN SHAFT.ALL
DRIVE GEARS ARE IN OIL BATH AND
BECAUSE OF THIS HIGHER SPEED OF
LOOM CAN BE ACHIVED.
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING MACHINE
(TSUDAKAMA JAPAN )
2. SHEDDING MOTION: THERE ARE TWO TYPES OF
SHEDDING MOTION
I) NEGATIVE SHEDDING
II) POSITIVE SHEDDING
I) NEGATIVE SHEDDING : IN NEGATIVE SHEDDING HEALD
FRAMEDOWN MOVEMENT IS DONE BY SNGLE CAM
AND RETURN OF HEALD FRAME IS DONE BY MEANS
OF SPRINGS.THESE SPRINGS CAN BE ADDED OR
REMOVED AS PER THE REQUIREMENT.NEGATIVE
SHEDDING GOT LIMITATION OF LOOM SPEED &
ELONGATION OF ROPE OR UNDERWIRE WHICH IS
MADE UP OF SYNTHETIC MATERIAL.IN NEGATIVE
SHEDDING MAXIMUM 8 HEALD FRAMES CAN BE USED.
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING
MACHINE (TSUDAKAMA JAPAN )
II) POSITIVE SHEDDING : IT IS A RELIABLE MEANS
OF MAKING HEALD FRAME UP & DOWN BY
TWO DIFFERENT CAS. IT IS A COMBINE CAM
ON WHICCH FOLLOWER ROLLS OF SHEDDING
LEVER AND THIS WAY UP & DOWN MOVEMENT
IS DONE.
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING
MACHINE (TSUDAKAMA JAPAN )
3. MEASURING & STORAGE
IT IS THE EQUIPMENT WHICH KEEPS
PREDETERMINED LENGTH OF WEFT YARN ON
DRUM OF WEFT ACCUMULATOR EQUAL TO 3
PICKS LENGTH .THIS KEEPS RESERVE OF 3
PICKS LENGTH ON THE DRUM.
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING
MACHINE (TSUDAKAMA JAPAN )
4. WEFT INSERATION
IN AIR JET AS THE WEFT YARN IS CARRIED BY
NEGATIVE MEANS,THE SHED OPENING
SHOULD BE CLEAR,EVEN SMALL HANGING OF
THREAD IN WARP SHEET WILL STOP PASSAGE
OF WFT YARN & IT WILL NOT PERMIT WEFT TO
REACH THE OTHER END OF THE SHED & STOP
THE LOOM AT ONCE
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING
MACHINE (TSUDAKAMA JAPAN )
4. WEFT INSERATION
IN MOST AIR JET WEAVING THERE ARE TWO
MAIN NOZZELS & 5 SUB GROUPS OF RELAY
NOZZLES, CONSISTING 5 SUB NOZZELS IN
EACH GROUP AT THE EQUAL DISTANCE OF 80
MM PITCH UPTO 4 GROUPS.IN THE LAST
GROUP RELAY NOZZLE ARE DISTRIBUTED
EQUALLY AS PER WIDTH OF THE FABRIC.
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING MACHINE
(TSUDAKAMA JAPAN )
4.
WEFT INSERATION
COMPRESSED AIR REGULATED & CONTROLLED AT
THE PRESSURE OF 3.5 TO 4 KG/CM2 ENTERS THE MAIN
NOZZLE WHICH PUSHES WEFT YARN TOWARDS WARP
SHED.THE SUB NOZZLE GROUP,RECEIVES REGULATED
AIR FROM SUB AIR TANK WHICH PUSHES WEFT YARN
ON BY ONE.THE AIR IS BLOWN AT DIFFERENT TIMINGS
OF DEGREE IN INDIVIDUAL GROUPS OF SUB NOZZLES
& WEFT YARN IS CARRIED THROUGH SHED.
MOST VITAL PART IS LEFT HAND SIDE WEFT CUTTER
AS IN ALL SHUTTELLES LOOMN IT PLAYS VERY
IMPORTANT ROLE AS EVERY PICK IS INSERTED & THEN
CUT.
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING MACHINE
(TSUDAKAMA JAPAN )
5.LET-OFF MOTION – ELO
ELECTRONIC LET-OFF MOTION.THIS MOTION IS
CONTROLLED BY LOAD CELL PLACED ON WHIP ROLL
& AMOUNT OF TENSION OF WARP CREATED IS IN KGF
& TRANSMITTED TO SERVO MOTOR THROUGH
MICROPROCESSOR & THEN IT GOVERNS THE
REVOLUTION OF SERVO MOTOR IN TURNS TO WARP
BEAM THROUGH WORM WHEEL , WORM GEAR & BEAM
PINION.
THE VALVES ARE FED TO IN THE MICROPROCESSOR
ARE
1. WARP TENSION IN KGF
2.BEAM DIAMETER IN CMS
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING
MACHINE (TSUDAKAMA JAPAN )
5.TAKE- UP MOTION – MTU & ETU
MECHANICAL TAKE UP (MTU) IT IS A 7
WHEEL TAKE UP MOTION & AS PER
REQUIRED PICKS/INCH PICKS WHEEL
ARE CHANGED.
ELECTRIC TAKE UP (ETU) THE RQUIRED
PICKS / INCH ARE FED IN
MICROPROCESSOR.
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING MACHINE (TSUDAKAMA JAPAN )
6.SELVEDGE FORMATION : IT IS THE LENO SELVEDGE.THE
TWO THREADS OF 75 DENIER , 450 TPM GETS TWISTED
& BINDS THE SELVEDGE OF THE FABRIC
7.
WFET DETECTOR : IN AIR JET LOOM THERE ARE TWO
FILLING DETECTORS H1 & H2 FEELERS.
THE PURPOSE OF H1 FEELER IS TO STOP THE LOOM IN
THE CASE OF WEFT YARN DOES NOT REACH IN FRONT
OF THE FEELER.WHEREAS PURPOSE OF H2 FEELER IS
TO STOP THE MACHINE IF WEFT YARN REACHES IN
FRONT OF THE FEELER.THESE FEELERS WORKS ON
THE PRINCIPLE OF REFLECTION. THERE ARE TWO
EYES ON FEELER ONE IS IMMITER AND THE OTHER IS
RECEIVER.THE REFLECTION IS DONE THROUGH
STAINLESS STEEL PROFILE REED WHICH IS IN FRONT
OF THE TWO FEELER
AIR JET WEAVING
DIFFERENT MOTION OF AIR JET WEAVING
MACHINE (TSUDAKAMA JAPAN )
WARP STOP MOTION: ELECTRICAL WARP
STOP MOTION WORKS ON THE
PRINCIPLE OF CONTACT & CIRCUIT IS
COMPLETED AS SOON AS DROP WIRE IS
COMING IN CONTACT WITH SERRATED
BARS AND LOOM STOP DURING
BREAKAGE OF WARP YARN