Cross-section of Knitting Head of a Single Jersey Machine

Single Jersey Knitting Machine: 
Plain fabric is a single jersey fabric and is produced by one set of needle. Most of single-jersey fabric is produced on circular machines whose latch needle cylinder and sinker ring revolve through the stationary knitting cam systems, which together with their yarn feeders are situated at regular intervals around the circumference of the cylinder.

The yarn is supplied from cones, placed either on an integral overhead bobbin stand or on a free-standing creel, through tensioners, stop motions and guide eyes down to the yarn feeder guides. The fabric, in tube form, is drawn downwards from inside the needle cylinder by tension rollers and is wound onto the fabric batching roller of the winding down frame. The winding down mechanism revolves in unison with the cylinder and fabric tube and is rack – lever operated via cam- followers running on the underside of a profiled cam ring.

As the sinker cam- plate is mounted out side on the needle circle, the center of the cylinder is open and the machine is referred to as an open top or sinker top machine. Compared with a rib machine, a plain machine is simpler and more economical with a potential of more feeders, higher running speeds and the possibility of knitting a wider range of yarn counts. The most popular diameter is 26" giving an approximate finished fabric width of 60" to 70".

An approximately suitable count may be obtained using the formula Ne =G2/18 , where Ne = cotton count or English system and G = gauge in npi. For fine gauges a heavier and stronger count may be necessary.

Cross-section of Knitting Head of a Single Jersey Machine:

Following figure shows a cross section of the knitting head all of whose stationary parts are shaded.
Cross-section of knitting head of a single jersey machine
Fig. Cross-section of knitting head of a single jersey machine
  1. Yarn feeder guide, which is associated with its own set of knitting cams.
  2. Latch needle.
  3. Holding-down sinker – one between every needle space.
  4. Needle cylinder (in this example, revolving clockwise).
  5. Cylinder driving wheel.
  6. Cylinder driving gear.
  7. Sinker-operating cams, which form a raised track operating in the recess of the sinker.
  8. Sinker cam-cap.
  9. Sinker trick ring, which is simply and directly attached to the outside top of the needle cylinder thus causing the sinkers to revolve in unison with the needles.
  10. Needle-retaining spring.
  11. Needle-operating cams which, like the sinker cams, are stationary.
  12. Cam-box.
  13. Cam-plate.
  14. Head plate.
  15. Cylinder driving pinion attached to the main drive shaft.
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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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