Rib Circular Knitting Machine

Name of the experiment: Study on Rib Circular knitting machine. 

The structure in which the face and back loop occurs along to the coarse successively but all the loops of a wale is same is called rib structure. The circular knitting machine which is used to produce the rib structures is known as rib machine.

Machine specification:
  1. Machine model → cmoan
  2. Manufacturer → Paolo Orizio
  3. Made in → Italy
  4. No of feeders’ → 40
  5. Cylinder diameter →20”
  6. Needle gauge → 18 / inch
Machine parts:
  1.  Yarn career
  2.  Break stop motion
  3.  Yarn guides
  4.  Dial
  5.  Cylinder
  6.  Dial cams
  7.  Cylinder cams
  8.  Dial needles
  9.  Cylinder needles
  10.  Oiling and air following devices
  11.  Sensors
  12.  Take up rollers
  13.  Batch rollers
  14.  Motor
  15.  Belts
  16.  Pulleys and gears
  17.  Clutches
Description of the machine:
In a dial cylinder rib machine there is one set of needles on the circumference of the vertical cylinder and another set of needles on a horizontal dial. So two sets of needles remain at the right angle with each other. In dial cylinder machines the dial and cylinder rotates but the cam systems with the feeders remain stationary.

The dial needles get its motion from its butt which is placed on the cam truck. This cam truck is formed by different cam placed on a cam plate.

During the rotation of the cylinder, cylinder needles moves vertically and dial needles moves horizontally. Cylinder needles also get its motion from it. There is a cloth tale up roller which also rotates with unison to dial and cylinder and fabric is wound on it. 

In rib circular knitting m/c, Rib gaiting:

 Knitting action:
The knitting action of a circular rib machine is shown in Fig:

1. Clearing: The cylinder and dial needles move out to clear the plain and rib loops formed in the previous cycle.

2. Yarn feeding: The needles are withdrawn into their tricks so that the old loops are covered by the open latches and the new yarn is fed into the open hooks.

3. Knocking Over: The needles are withdrawn into their tricks so that the old loops are cast off and new loops are drawn through them.
Fig: Knitting action of rib circular knitting machine
This experiment has significance in our study life. In this experiment we sketch the yarn path diagram of the machine, show the knitting action, cam system. We point out the various specification of the machine. 
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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