The document summarizes the features and working of a rib circular knitting machine. It describes how rib fabrics have alternating wales of face and back loops which makes the fabric thicker and less prone to curling. It then explains the working of a rib circular knitting machine, including the path of the yarn from creel to needles to fabric winding roller. The key parts of the machine like dial, cylinder, needles and their functions are outlined. Finally, the 8 step knitting action is illustrated with diagrams showing the movement of needles from tuck to cast on position to form loops and stitches.

1. Presented by:
Subrata Kumar Sarker
ID:151014002
Department of textile engineering

2. My presentation topic is
Rib circular knitting machine
•It contains
• Rib fabric & its features
• Rib circular knitting machine working procedure
• Uses of rib fabric

3. In rib Structure each course having one face and one back loop,
with succeeding courses identical to the first one, having
alternating wales of face and back loops.

4. Features of rib fabric
 The appearance of face and back are identical.
 Fabric lengthwise & widthwise extensibility is
approximately twice that of single jersey.
 The structure has alternative wales of face & back
loop.
 Fabric thickness is approximately twice than single
jersey.
 Fabric does not curl at edge.
 Unraveling is possible only from end knitted last.

5. Rib Fabric

6. 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.

7. Description of yarn fabric path diagram : In this
circular knitting m/c ,yarn is supplied from the set of
packages which is placed in the creel. When supplying
the yarn from the packages tensioner & anti snail device
are placed over & in contact with the yarn. The yarns is
fed from the feeder to the needles of the needles of the
dial & cylinder. In successively, the knitted fabric is
produced by the action of needles, cam & sinker. The
produced knitted fabric is passed over & in contact with
the fabric spreader & fabric withdraw roller. Finally the
fabric is wound in the fabric winding roller

8. Yarn fabric path diagram flow chart
• Creel
• Feeder
• Needles
• Fabric Spreader
• Fabric withdraw roller
• Fabric winding roller

9. Fig : Yarn to fabric path diagram of Rib Circular Knitting
Machine

10. Functions of rib circular machine's different
part
1.Creel:Creels are the knitting elements which carry the
yarn packages to feed the knitting zone.
2.Feeder:The feeders feed the yarn into the needles
hooks and control the needle latches in their position
while the needles attain their position.
3.Dial:Dial is the upper steel needle bed used in double
jersey knitting mc. Into the grooves of the dial ,the
needles are mounted horizontally and near allowed to
move radically in and out by their dial cam.
4. Guide: Guides control the yarn path which is very
necessary

11. Functions of rib circular machine's different part
5. Needle: It is the principal element of knitting m/c.
The function of the needle to retain old loop & to
receive the new loop.
6. Cam: The cams are the mechanical devices which
convert the rotary m/c drive into a suitable
reciprocating action for the needles.
7. Cylinder: The cylinder is a steel circular bed
having grooves on its outer periphery where the
needles are mounted.
8.Fabric Spreader: A simple fabric spreader is a
solid wooden plate, placed above the take down
rollers & held in position by the fabric tube.
9.Cloth roller: this mechanism withdraw the fabric
from the needles & winds them into cloth roller

12. Fig: Knitting
action of rib
circular knitting
machine

13. Knitting action of the rib circular machine
1 .Rest position: The rest position for the cylinder and dial
needles. Needles are constant. Loops are present in their
hooks. Latches are close.
2. Tucking position for dial needle: The dial needle moves
forward. Loop is present on the latch. Latch is open. Cylinder
needle is in the rest position.
3. Tucking position for cylinder needle: The cylinder needle
moves forward. The cylinder loop is present on the latch. Here
dial needle holds down the fabric on the cylinder needle. So
that the latch of the cylinder needle is opened.
4. Clearing position of dial needle: The dial needle further
moves forward to clear the old loop from its latch. Here dial
latch is open.

14. Knitting action of the rib circular machine
5 .Clearing position of cylinder needle: The cylinder needle
will further move forward to clear the old loop from its latch.
Cylinder latch is open.
6 .Yarn presenting position: The cylinder and dial needles
are pulled back again and they move into their yarn presenting
position. The newly presented yarn is laid in the open needle
hooks of both the needles.
7. Cast on position: The cylinder and dial needles are pulled
further and move into their cast on position. Here the loops lie
over the closed needle head and the newly presented yarn is
held in the closed needle head.
8 .Knock-over position: The cylinder and dial needles are
pulled further .The new yarn is drawn through the loops of the
both needles. The loops are knocked-over as stitches and new
loops are formed out of the yarn presented.

15. Uses of rib fabric
Men’s wear Women’s wear

16. Uses of rib
Men’ sweater Women’ sweater

17. Uses of rib
Men’ trouser Women’ trouser

18. Uses of rib
 Skirts
 Sleeping
garments
 Gloves
 Topoi
 Lining
 Covering
 Sheets
flannel

19. Bangladesh knitwear exports

20. Any questions