Calculation of 5-Wheel Take up Mechanism

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5-Wheel Take up Mechanism:
The process of withdrawing fabric from the 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. For doing this work two types of machines are used. One is the 5-wheel mechanism and another is a 7-wheel mechanism. A 5-wheel take-up mechanism is used in the case of jute weaving. In this article, I will discuss a calculation of the 5-wheel take-up mechanism.

5-Wheel Take-up Mechanism
Fig: 5-Wheel Take-up Mechanism

Where,

A = Rachet wheel = 50-60T
B = Change wheel = 1/4
C = Stud wheel = 100-120T
D = Stud pinion = 12-18T
E = Take up wheel = 60-100T
F = Take up roller = 15-16″ (circum)
G = Finger
H = Take up lever
M = Pushing pawl
N = Rotating catch

5-Wheel Take-up Mechanism Working Process:

  1. The beam wheel E is set screwed on the beam shaft and its teeth engaged those of stud pinion D which is connected with stud wheel C.
  2. The stud pinion and stud wheel work loosely upon a stud in a slotted bracket, the slot is concentric with the cloth beam F.
  3. This positive take-up motion is primarily imparted from the sley sword. The finger enters into the slot of the take-up lever H, which is fulcrum at I.
  4. A swinging motion is given to the sley sword and this will cause the paw M to drive the ratchet wheel A and set the train of wheels in motion.
  5. The rachet wheel is moved the distance of one tooth by the oscillating pawl for every pick.
  6. Thus motion is transferred to the cloth roller from the rachet wheel by means of five wheels.

Calculation of 5-Wheel Take-up Mechanism:

PPI: For one rev of one tooth of Rachet wheel (A) = 1 pick take-up

………………………………………………………….E      C        A
No of revolution of A for 1 rev of F = 1 x ….. x ….. x …..
………………………………………………………….D      B        F

……..75      120      50
= 1 x ….. x …… x ……
……..15        x        15

….2000
= ……….
……..x

Pick spacing:

………………………1…………x
Pick spacing = …….. = ……….
…………………….PPI……2000

………………………….B      D       F
Or Pick spacing = ….. x ….. x ……
………………………….C      E       A

……x……15…..15
= ……. x ….. x …..
….120….75….50

……..x
= ……….
….2000

Loom constant:
Loom constant is obtained by taking the no of teeth in change wheel = 1

………………………….E x C x A
Loom constant = ………………..
…………………………..D x 1 x F

…………………..Loom constant
Hence, PPI = ………..……………
……………………Change wheel

Contraction 1.5% is not added due to using coarse fabric, Jute, Blanket, Canvas fabric.

So, not adding of 1.5% contraction

Author of this Article:
Rofiquzzaman Raju 
Fabric Technologist,
B.J.Group, Mawna, Gazipur
Chittagong Textile Engineering College
Contact: 01714419681

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