sequence of the Primary Motions

Q. Give the sequence of the Primary Motions? Write in detail about them?


PRIMARY MOTIONS

1. SHEADING.
A process of raising and lowering of the warp yarn by the harness es to make an opening for the filling yarn to pass through.
* To raised and lowered from of warp yarn is called shed
* Opening or division of sheet of yarn into two parts for passage of weft is called
shedding.

2. PICKING(WEFT INSERTION)
* inserting/filling yarn through shed by a carrier device
* in shuttle loom, the weft carrier is the shuttle.
* where as in the shuttle less loom/the projectile, water jet, air jet carries the weft yarn.

3. BEATING UP MOTION
* beating up is the third operation of the weaving cycle
* this pushes each loose filling yarn into the cloth by the reed, after the shuttle has moved through the shed.
* as soon as weft yarn is inserted. The reed push or beat up to the fell of the cloth
* to fell of the cloth is the edge is nearest to the reads the cloth is being woven. in other word the beating up occurs when the reed push the newly inserted weft against the fell of the cloth.
* beating up give the fabric firm and compact construction.

Q. GIVE THE WORKING OF THE SECONDARY MOTION?

SECONDARY MOTION

1.LET OFF MOTION.

* let off motion is the warp controlling motion that delivers warp it the waving area at the required readapt the suitable construction tension by un-winding git form the warp beam.
* the yarn from the warp beam passes over the back rest and comes forward through the drop wire of the warp stop motion to the healds which are responsible for separating the warp sheet for the purpose of shead formation
* in then passes through the red, which hold the thread at uniform spacing and beating up the weft threadsthat has been left in the triangular warp shed formed by the two warp sheet and the read.

2.TAKE UP MOTION.

* take up is the cloth controlling motion that with draws fabric from the weaving area at a constant rate
* this ensures that the required pick maintained and them wind it into the cloth roller.
* temples hold the cloth firm at the fell to assist in the formation of a uniform fabric, which them passes over the front rest , round the take up roller and into the cloth roller.


Q. WHAT DO YOU UNDERSTAND BY THE STOP MOTION ON THE LOOM?
OR
WHAT ARE THE DIFFERENT TYPE OF THE STO MOTION?
STOP MOTION

The incorporation of the “primary motion” I .e shedding, picking, beating-up, take-up, let off can complete the process of warp and weft yarn interlacement to produce the fabric. But to achive the maximum output material. “machine and man power”. It is most urgent to install the stop motion on the loom .following stop motion have their important role in achieving the optimum production and good standard quality of fabric.
1. WARP STOP MOTION
Which stop the loom when the drop wire falls as the result of an end break.
2. WEFT STOP MOTION
To stop the loom in the event of break in weft yarn.
3. WARP PROTECTING MOTION
Which stop the loom before beat up in the event of the shuttle or projectile filling to complete its traverse from one side of the loom to other
4. WEFT REPLENISHMENT
Which ensures a continuous supply of weft yarn to the loom when ever a supply package exhausted
Q. WXPLAIN WITH THE DIAGRAM OF THE WORKING OF WARP STOP MOTION?

WARP STOP MOTION

The function of the motion is to stop the loom, when ever the warp thread break or missing end appears. If the loom does not stop at such a chine damage like missing end broken end will be found in the fabric produce. Further if an endbrean and its entangles with the neighboring threads and the loom is not stop, many threads will be broken and a damage like “float” (unwoven stop)appear in the fabric. So it is very important that the loom must be stoped at such a chance. There are two type of warp stop motion are
1. mechanical warp stop motion
2. electrical warp stop motion
3.
.MECHENICAL WARP STOP MOTION

In this motion thin metallic part known as dropper plays important role. Every treads coming from the beam is passed through the eye of the dropper .so each thread is supporting a dropper in the case when an end break. The dropper will fall down touch moving bar and the knock aff leaver hit to the starting handle and the loom become stop.
b) and this type of work stop motion special type of dropper bar is used. as the work and break as a missing and appears the dropper supported by this and dropper on the dropper bar and completes the electric circuit .the loom is stopped.
Q.WITH THE HELP OF DIAGRAM EXPLAIN HOW PICK IS INSERTED IN PROJECTILE LOOM OR SULZER LOOM?

PROJECTILE.

1. projectile 5 moves into the picking position
2. projectile feeder3 opener after 5 has griped the filling ends presented to it.
3. the projectile has drown the yarn through shed while filling pensioner lever 2 and adjustable filling break 1 act to minimize the strain placed on the yarn during picking.
4. the projectile is braked by projectile break in the receiving unit and pushed back. While the filling pensioner lever and the filling break hold the filling yarn lightly stretched. At the same time, the projectile feeder moves closed to the selvage.
5. the projectile feeder3 take over the filing yarn while filling end dropper hold it at both side of th fabric.
6. the yarn is released by the projectile on the receving side. Filling cutter cut the filling yarn. A conveyor takes expelled projectile 5 and carries out side the shed back to the picking position.








1.weft break.
2.weft pensioner level
3.projectile feeder
4.weft cutter.
5.projectile
6.reed.
7.torsion road
8.projectile brake
9.convear chain
10.projectile lifter
11.projectile opener

Q. GIVE THE BRIEF INTRODUCTIONOF EACH TYPE OF SHUTTLE LOOM?
DISCUSS WHY SHUTTLE LESS WEAVING LOOM WHERE NEEDED?


There are two type of loom
1.SHUTTLE LOOM .
2.SHUTTLE LESS LOOM.


1.SHUTLE LESS LOOM
The shuttle less loom are modified form of the shuttle loom. In this weaving system the weft yarn feeding system by conventionally used shuttle has been replaced by the projectile, by water jet. By air jet, by rapier
Type of shuttle less loom
Projectile loom
Water jet loom
Air jet loom
Rapier loom
* PROJECTILE LOOM
In this system used a small projectile to carry the filling yarn through shed
* RAPIER LOOM
In this system a special part known as “rapier head” which are two on one loom are used. One apier had which feed the weft yarn from for picking side is called “feed rapier head” while the other head in the middle of the loom is called receiving rapier head.
* AIR JET LOOM
In this system pressurized air is used to insert the weft yarn from one side of the loom to the other side of loom.
* WATER JET LOOM
In this system of weft insertion pressurized of water is used to insert the weft yarn from one side of the loom to the other side of loom.

MODERN DEVELOPMENT IN LOOM TECHNOLOGY
Because of international market competition, it was felt seriously by the weaving technologist to cmprove felt to satisfy customer.
1 wider width fabric(minimum 36 inch and above).
2 fine verities.
3 defect free cloth for longer length .
4 competition price/meter.
5 Consistency in quality.
6 adoptability in trend change .
7 quick delinery.
8 value addition .
9 best services.