Weaving Technology Lab experiment 4, 5 and 6
EX-04 Experiment Name: Study on passage diagram of ordinary power loom.
Experiment No. 04
Experiment Name: Study on passage diagram of ordinary power loom.
Theory:
The process of producing a fabric by interlacing warp and weft threads is known as weaving. The machine used for weaving is known as weaving machine or loom.
Objects:
1. To know about the different parts of loom machine.
2. To know about the passage diagram of loom machine.
3. To acquire knowledge about different types of motions which is needed to operate a loom machine.
Passage of warp and cloth through a ordinary power loom:
A warp sheet A from a weaver’s beam B passes around a back rest C and is led around lease rods D to heald shafts E & F which are responsible for separating the warp sheet into two layers to form a shed. The purpose of the back rest and the lease rods is to separate the warp yarns uniformly and precisely, and reduce entanglement and tension in the yarns during the opening of the warp shed.
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A - Warp sheet
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B - Weaver's beam
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C - Back rest
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D - Lease rods
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E - Heald shaft
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F - Heald shaft
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G - Reed
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H - Cloth
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I - Weft yarn
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J - Temples
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K - Front rest
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L - Take-up roller
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M - Guide roller
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N - Cloth roller
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Figure: Passage of warp and cloth through a plain power loom
The warp yarns then pass through a reed G, which holds the yarns at uniform spacing and is also responsible for beating-up the weft yarn I into the fell of the cloth. After the weft is beaten up, the warp yarns interchange positions in the shed and thereby cause interlacing to be achieved. At this point, cloth is formed and is held firmly by temples J to assist in the formation of a uniform cloth. The cloth H then passes over a front rest K, around an emery roller or take-up roller L and a guide roller M and is finally wound on to a cloth roller N.
EX-05 Experiment Name: Study on shedding mechanism of an ordinary power loom.
Experiment No. 05
Experiment Name: Study on shedding mechanism of an ordinary power loom.
Theory:
The shedding mechanism separates the warp threads into two layers or divisions to form a tunnel known as ‘shed’.
There are three types of shedding mechanism as below:
1. Tappet shedding mechanism
2. Dobby shedding mechanism
3. Jacquard shedding mechanism.
In our lab house dobby shedding mechanism is used to make shed which is placed on the top of a loom in order to produce figure patterns by using a larger no of healds than the capacity of tappet. Dobby is a mechanism which is attached with the loom to control the movement of heald shaft.
Objects:
1. To know about the different parts of shedding.
2. To learn the mechanism of dobby shedding.
3. To know about the gearing diagram of loom machine.
4. To know about the working sequence of dobby shedding process.
Main parts of dobby shedding mechanism:
1. Motor pulley
2. Motor
3. Machine pulley
4. Bottom shaft
5. Connecting rod
6. T-lever
7. Link rod
8. Jack lever
9. Heald shaft
10. Returning spring
EX-06 Experiment Name: Study on picking mechanism of an ordinary power loom.
Experiment No. 06
Experiment Name: Study on picking mechanism of an ordinary power loom.
Theory:
Pick is a single weft thread in a fabric as woven. It is the second primary motion in weaving. The process of passing weft thread through warp shed during weaving is called picking.
After the shedding mechanism opens the warp thread to form a shed, the picking motion comes into play to insert a weft thread (known as a pick) across the warp through the shed.
There are different types of picking mechanism. In our lab house bowl-and-shoe side lever under-pick mechanism is used for picking.
Objects:
1. To know about the different parts of picking mechanism.
2. To learn the mechanism of picking mechanism.
3. To know about the gearing diagram of picking mechanism.
4. To know about the working sequence of picking mechanism.
5. To learn about different types of picking mechanism and their differences from each other.
Main parts of picking mechanism:
1. Motor
2. Motor pulley
3. Machine pulley
4. Bottom shaft
5. Picking tappet
6. Bowl
7. Shoe
8. Side lever
9. Picking stick
10. Picker
11. Return spring
Working Principle:
In under picking mechanism a race board is situated over picking arm. Under picking is controlled by picking cam which is fixed on the bottom shaft. At first the motion comes from motor and m/c pulley.
Then the motion comes in to the bottom shaft and thus picking cam. When picking cam rotates and its nose portion comes in contact with treadle lever and pushes it then the treadle lever pushes the angular lever. The picking arm gets motion from angular lever which is connected with picking arm.
A picker is placed in the picking arm which pushes the shuttle. When shuttle gets motion by picking arm then shuttle begins to move to and fro on the race board. Thus picking is done.
A spring is situated which causes the picking arm and picker to move back after the delivery of the pick. At the two end of bottom shaft, two picking tappets are fixed. By increasing nose length picking speed may be increased.
Then the motion comes in to the bottom shaft and thus picking cam. When picking cam rotates and its nose portion comes in contact with treadle lever and pushes it then the treadle lever pushes the angular lever. The picking arm gets motion from angular lever which is connected with picking arm.
A picker is placed in the picking arm which pushes the shuttle. When shuttle gets motion by picking arm then shuttle begins to move to and fro on the race board. Thus picking is done.
A spring is situated which causes the picking arm and picker to move back after the delivery of the pick. At the two end of bottom shaft, two picking tappets are fixed. By increasing nose length picking speed may be increased.
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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