Definition | Take up | Seven wheel take up mechanism of loom (Cotton Weaving)

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.

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.

Types

According to drive:

1. Positive take up.
2. Negative take up.

According to motion of the cloth/Rate of take up-

1. Continuous
2. Intermittent

According to drive given to the cloth roller-

1. Direct drive
2. Indirect drive

According to number of gear train:

1. 5-Wheel
2. 6-Wheel
3. 7-Wheel

According to brand name-

1. Sulzer
2. Pickanol
3. Toyota

Objects

1. To know about the construction of the mechanism.
2. To know about drive of the take-up motion.

Main parts of machine used in take up mechanism

1. Sley
2. Sleysword
3. Connecting rod
4. Monkey tail
5. Holding/Catching/Locking pawl.
6. Pulling pawl
7. Rachet Wheel
8. Standard wheel
9. Changewheel
10. Sewing wheel/Pinion
11. Stud/Compound wheel
12. Stud/Compound Pinion
13. Take up wheel
14. Take up roller
15. Cloth roller

Working principle
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. The positive take-up mechanism consists of seven wheels. These are

• Rachet
• Standard wheel
• Change pinion
• Stud pinion
• Stud wheel
• Swing pinion
• Take-up roller wheel

The motion is primarily imparted from the sleysword. The sleysword is connected to the slaythat 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.