Experiment Name: Study on seven wheel take up mechanism.
Theory: The function of the take up the motion 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 inch, that contribution
to the uniform texture of the fabric.
Objective:
I) To learn about the take up mechanism.
II) To learn about gearing of that mechanism and calculate
PPI.
Figure:
Related Machine Parts:
- Sley Sword.
- Finger
- Take up lever
- Pawl
- Returning Clutch
- Ratchet Wheel
- Standard Pinion
- Change Wheel
- Change Pinion
- Compound Wheel
- Compound Pinion
- Take Up Wheel
- Take Up Roller
Construction of the mechanism:
A) In this mechanism take up lever connect both sley sword
ad ratchet wheel . For beat up the ratchet wheel move due to push by the pawl
B) Ratchet wheel connected with standard wheel.
C) Standard wheel connected with change wheel and change
wheel attach with change pinion by shaft.
D) Change pinion transmit motion to compound wheel which is
connected with compound pinion by shaft.
E) Compound pinion transfer motion to take up wheel which
connected with take up roller.
Working Principle:
1) The pawl move with sley sword which push the ratchet
wheel for every beat up.
2) Ratchet wheel transfer motion to standard wheel.
3) Change wheel received motion from standard wheel, it
transfer motion to change pinion.
4) Change pinion sent motion to compound wheel so compound
pinion is also rotate.
5) Compound pinion transfer motion to take up wheel so take
up roller received motion.
Calculation:
Circumference of take up roller is 15.8"
IF it rotate one time the no. of picks
= 1 X (96/15) X (89/24)
X (56/36) X 24
= 886
PPI = 886 / 15.8 = 56
Loom Constant = {
1 X (96/15) X (89/24) X (1 / 36)
X 24 } / Circumference of take up
roller
= 1
PPI = Loom constant X
No. of Change wheel pinion Teeth
= 1 X 56
= 56
Result : Picks per inch = 56
Conclusion:>>>>>>>>>>>>>>>>>>>
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