Weaving Technology Lab experiment 7, 8 and 9
EX - 7Study on beating mechanism of an ordinary power loom.
Experiment No. 07
Experiment Name: Study on beating mechanism of an ordinary power loom.
Theory:
It is the third primary motion in weaving. It is a process of pushing the newly inserted weft yarn to the already woven fabric at a point known as the “fell of the cloth” with the help of a reed fixed in the sley. The sley is given a sudden and quick movement towards the fell of the cloth by the cranks in the crank shaft.
Objects:
1. To know about the different parts of beating mechanism.
2. To learn the mechanism of beating mechanism.
3. To know about the gearing diagram of beating mechanism.
4. To know about the working sequence of beating mechanism.
5. To learn about different types of beating mechanism and their functions.
Main parts of beating mechanism:
1. Motor
2. Motor pulley
3. Machine pulley
4. Crank shaft
5. Connecting arm
6. Race board
7. Rocking shaft
Working Principle:
The crankshaft gets drive from motor via motor pulley and m/c pulley. The crankshaft has two cranks. These cranks transform the rotary motion into swinging motion. The reed cap is connected by crank arm to crank of the crankshaft. Again the reed is connected between reed cap and sley. There is sleysword under the sley that is bolted to the rocking shaft. There is also shuttle box on the sley. Now the crank gives the swinging motion to the sley by crank arm. When the sley is moving towards the healdshaft at certain position the shuttle passes through warp shed. Again when the sley is coming towards the front rest at last position the reed pushes the last pick to the previous pick of cloth. This is the beating-up motion and the cloth increases in lengthwise in this way.
EX-8 Study on 7-wheel take-up mechanism of an ordinary power loom.
Experiment No. 08
Experiment Name: Study on 7-wheel take-up mechanism of an ordinary power loom.
Theory:
Take-up is to draw a fabric to the cloth roller regularly as it is woven. Texture of a fabric largely depends upon the number of ends and picks per centimeter or inch. This motion determines the number of picks of weft per inch or centimeter and contributes to the uniform texture of the fabric. It is the work of the weaver for accurately fixing the position of the fell of the cloth before starting a loom.
Objects:
1. To know about the construction of the mechanism.
2. To know about drive of the take-up motion.
3. The process of withdrawing fabric from weaving zone at a constant rate and then winding the woven cloth on the cloth roller with the continuous progress of weaving is called take up motion
Main parts & Specifications:
1. Sley
2. Sleysword
3. Connecting rod
4. Monkey tail
5. Holding/Catching/Locking pawl.
6. Pulling pawl
7. Rachet Wheel (24)
8. Standard wheel (36). 9.Change wheel(1-Let)
9. Sewing wheel/Pinion (24)
10. Stud/Compound wheel (89)
11. Stud/Compound Pinion (14)
12. Take up wheel (89)
13. Take up roller (dia:15.5 inch)
14. Cloth roller
Fig: 7-Wheel Take Up Mechanism
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Motion Transfer:
Sley sword to connecting rod. Connecting rod to monkey tail. Monkey tail to pawl. Pawl to rochet wheel. Rochet wheel to standard wheel. Standard wheel to change wheel. Change wheel to sewing wheel. Sewing wheel to stud wheel. Stud wheel to stud pinion Stud pinion to take up wheel. Take up wheel to take up.
Working Principle:
Working Principle:
This positive take-up mechanism consists of seven wheels. These are
1. Rachet,
2. Standard wheel,
3. Change pinion,
4. Stud pinion,
5. Stud wheel,
6. Swing pinion and
7. Take-up roller wheel.
The motion is primarily imparted from the sleysword. The sleysword is connected to the slay that gets motion from crank shaft and the crank shaft gets motion from motor by gearing. At the bottom of sleysword a connecting rod is connected which passes the motion to the monkey tail.
The monkey tail is fulcrum with two pawls: the upper is holding pawl and lower is pulling pawl. These two pawls are mounted freely to the ratchet wheel which is connected with the standard wheel by shaft. Over the standard wheel the change pinion is geared. The change pinion is connected with the stud pinion by shaft and the stud wheel is geared with the stud pinion upon it. The swing pinion is connected with the stud wheel and the cloth take-up roller wheel is geared with the swing pinion.
The cylinder upon which the woven fabric is wound, is connected with this wheel by shaft. Now when the sley moves one time after one pick insertion the connecting rod pass this motion to the monkey tail and as the pawls are fulcrum with monkey tail they get downward motion. Using this downward motion the pushing pawl pulls the rachet wheel one time and the holding pawl holds the rachet in this position. Finally the cloth roller gets the motion by gear train and thus fabric is wound on cloth roller continuously with the weaving of fabric.
The monkey tail is fulcrum with two pawls: the upper is holding pawl and lower is pulling pawl. These two pawls are mounted freely to the ratchet wheel which is connected with the standard wheel by shaft. Over the standard wheel the change pinion is geared. The change pinion is connected with the stud pinion by shaft and the stud wheel is geared with the stud pinion upon it. The swing pinion is connected with the stud wheel and the cloth take-up roller wheel is geared with the swing pinion.
The cylinder upon which the woven fabric is wound, is connected with this wheel by shaft. Now when the sley moves one time after one pick insertion the connecting rod pass this motion to the monkey tail and as the pawls are fulcrum with monkey tail they get downward motion. Using this downward motion the pushing pawl pulls the rachet wheel one time and the holding pawl holds the rachet in this position. Finally the cloth roller gets the motion by gear train and thus fabric is wound on cloth roller continuously with the weaving of fabric.
EX -9 Study on negative let-off mechanism of an ordinary power loom.
Experiment No. 09
Experiment Name: Study on negative let-off mechanism of an ordinary power loom.
Theory:
Let-off is to supply warp thread in the weaving zone at a predetermined rate. Negative let-off is a mechanism for controlling the rotation of the beam on a weaving, warp knitting or other fabric forming machine where the beam is pulled round by the warp against a breaking force applied to the beam.
Objects:
1. To know about the construction of the mechanism.
2. To know about drive motion of the let-off motion.
Main parts & Specifications:
1. Warp beam.
2. Beam ruffle.
3. Chain.
4. Machine frame.
5. Weight lever.
6. Pivot.
7. Fulcrum.
8. Weight.
2. Beam ruffle.
3. Chain.
4. Machine frame.
5. Weight lever.
6. Pivot.
7. Fulcrum.
8. Weight.
Working Principle:
The warp beam ruffle is wrapped around by chain. The one end of the chain is fixed at . i.e. at the m/c frame whereas the other end is connected to fulcrummed device to the weight lever , which is pivoted and a dead weight is placed which can be moved along the length of the weight lever.
In this system the tension of the warp is regulated by the friction between chain and the beam ruffle. The friction is controlled by dead weight on the weight lever and the distance of deadweight from the pivot. Heavier the dead weight and longer the distance of it from the pivot lesser the let-off.
The warp beam dia gradually decreases as weaving proceeds. So it’s necessary to increase the let-off rate. If the dead weight is kept on the same place, the let-off rate will remain unchanged. So an experienced worker is required to change the dead weight gradually with the change of the warp beam dia. As a result irregular tension occurs and the rate of yarn breakage may increase.
In this system the tension of the warp is regulated by the friction between chain and the beam ruffle. The friction is controlled by dead weight on the weight lever and the distance of deadweight from the pivot. Heavier the dead weight and longer the distance of it from the pivot lesser the let-off.
The warp beam dia gradually decreases as weaving proceeds. So it’s necessary to increase the let-off rate. If the dead weight is kept on the same place, the let-off rate will remain unchanged. So an experienced worker is required to change the dead weight gradually with the change of the warp beam dia. As a result irregular tension occurs and the rate of yarn breakage may increase.
Negative let-off mechanism is a very simple and manual mechanism. It is suitable for light and medium weight fabrics. It is mainly used in old looms and for weaving of plain cotton fabric.
Also have...
Experiment No. 01
Experiment Name: Study on different types of winding package and winding process.
Experiment No. 02
Experiment Name: Study on different types of warping system.
Experiment No. 03
Experiment Name: Study on slasher sizing machine.
Experiment No. 04
Experiment Name: Study on passage diagram of ordinary power loom.
Experiment No. 05
Experiment Name: Study on shedding mechanism of an ordinary power loom.
Experiment No. 06
Experiment Name: Study on picking mechanism of an ordinary power loom.
Experiment No. 07
Experiment Name: Study on beating mechanism of an ordinary power loom.
Experiment No. 08
Experiment Name: Study on 7-wheel take-up mechanism of an ordinary power loom.
Experiment No. 09
Experiment Name: Study on negative let-off mechanism of an ordinary power loom.
Weaving technology have lot of lab experiment , most commonly experiment r listed and explain there. For study of textile engineering this 9 experiment are needed all time. At textile university this 9 experiment are done at lab and explain that by lab report.
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