I - fulcrum
Tuesday, February 9, 2021
FIVE WHEEL TAKE - UP MOTION ( A SECONDARY LOOM MOTION)
Five wheel take-up motion ( a secondary loom motion)
Take up motion is a secondary loom motion. The take-up motion helps to perform continuous weaving of fabric. When the fabric is woven on the loom during weaving, it is pulled ( drawn) regularly according to picks per inch in the fabric. This fabric pulling ( drawing) process continues during loom operation. This drawn cloth is wound on the cloth beam or cloth roller).
In shuttle loom, intermittent take up motion is used. Actually, there are two kinds of take-up motions used in the loom.
1- Intermittent take-up motion
2 - Continues take-up motion.
Intermittent take-up motion
In this kind of mechanism, the emery roller does not rotate continuously. When the last inserted pick gets beaten by reed, the take-up roller draws the fabric in a forwarding direction and winds in on the cloth beam. The fabric pulling ( drawing) takes place intermittently.
There are two types of mechanisms used in shuttle loom:
1 - Five wheel take-up motion
2 - Seven wheel take-up motion
1 - Five wheels take up motion:
I - fulcrum
G - pushing pawl
E - ratchet wheel
F - change pinion
A - beam wheel
B - pin roller or take-up roller or emery roller
H - catcher
C - stud wheel
D - stud pinion
J - finger
Five wheels take-up motion is an intermittent take up motion. A train of five gears is used in this five wheel take-up motion mechanism. This mechanism receives the motion through slay sword by a connecting rod. One end of connecting rod gets connected to the sley sword with the help of a stud. This end of connecting rod gets free to rotate in both directions. The other end of this connecting rod is fulcrummed in the bottom of the finger 'J'.
When the crank is rotated, it imparts rocking motion to the sley sword. The connecting rod is connected to the sley sword from one side. When the slay starts to move from front dead centre to back dead centre, the slay starts to push the connecting rod fulcrummed with it.
When connecting rod travels toward the back dead centre, it pushes the finger 'J' fulcrummed with the other end.
The connecting rod pushes the finger 'J'. Since the finger 'J' is fulcrummed at point 'I', so that finger makes the angular movement at fulcrum 'I'. The direction of this angular movement of the finger changes with the slay sword position.
The pushing pawl 'G' is mounted in the upper slot of the finger 'j'. This pushing pawl is mounted with the help of a stud. This pawl can move freely on this stud.
As the finger goes toward the back dead centre, the pushing pawl impart the angular motion to ratchet wheel 'E'. The ratchet wheel starts to move now.
This ratchet wheel is mounted on the shaft. The ratchet wheel 'E' rotates with a shaft. A change pinion 'F' is also fastened on this shaft. The change pinion 'F' and ratchet wheel 'E' rotate together in the same direction as shown in the above figure.
A catch 'H' ( pulling pawl) is also fitted over the ratchet wheel. This catch prevents reverse motion of the ratchet wheel when the finger goes back toward the back dead centre.
Change pinion imparts motion to stud wheel 'C' fastened on a shaft. This shaft is rotated with a stud wheel. Another stud pinion 'D' is also fastened with this shaft. The stud wheel and stud pinion rotate together.
The stud pinion is geared with beam wheel 'A' fastened with a take-up roller shaft. The stud pinion imparts motion to the beam wheel. When this beam wheel rotates, it revolves the take-up roller 'B' together.
The take-up roller rotates in an anti-clockwise direction. Since the fabric passes over this take-up roller so that it pulls ( draws) the fabric in a forwarding direction.
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