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 continues weaving of fabric. When the fabric is woven on 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 us 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 do not rotate continuously. When the last inserted pick gets beaten by read, the take up roller draws the fabric in forward 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 wheel take up motion is a 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 slay sword with the help of stud. This end of connecting rod gets free to rotate in both directions. The other end of this connecting rod is fulcrummed in bottom of finger 'J' .
When the crank is rotated, it impart rocking motion to the slay sword. The connecting rod is connected to the slay sword from one side. When the slay starts to move from front dead center to back dead center, 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 angular movement at fulcrum 'I'. The direction of this angular movement of 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 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 start to move now.
This ratchet wheel is mounted on the shaft. The ratchet wheel 'E' rotates with shaft. A change pinion 'F' is also fastened on this shaft. The change pinion 'F' and ratchet wheel 'E' rotate together in same direction as shown in above figure.
A catch 'H' ( pulling pawl) is also fitted over the ratchet wheel. This catch prevents reverse motion of 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 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 take up roller shaft. The stud pinion imparts motion to beam wheel. When this beam wheel rotates, it revolve the take up roller 'B' together.
The take up roller rotates in anti clock wise direction. Since the fabric passes over this take up roller, so that it pulls ( draws) the fabric in forward direction.
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