Knitting Action of Tricot Warp Knitting Machine

Last Updated on 14/03/2021

Experiment Name:
Study on knitting action of Tricot warp knitting machine.

Introduction:
Tricot warp knitting machine may be made with either single-needle bar or double-needle bar. The warp knitting machine is a knitting machine where the loops are formed in course wise direction and the fabric produced is in open width form. In Tricot warp knitting machine compound or bearded needles are used. The warp yarns are feed to the needles through guide bars using shogging and swinging motion. In tricot machine, sinkers control the fabric throughout the knitting cycle. Double needle bar tricot machines can produce fabrics for outerwear and innerwear as well.

M/C specification:

  • Brand: LIBA
  • Origin: W. Germany
  • Manufacturing Company: MASCHINEN FABRIK, NAILA.
  • Manufacturing Year: 1991
  • Width: 84 inch/ 213 cm
  • Type: COP 2K
  • Gauge: 28

Knitting action of tricot machine:
Knitting action of tricot warp knitting machine is illustrated below image:

knitting action of Tricot machine
Fig: Knitting action of Tricot machine

All knitting actions are described briefly:

a) The rest position: Te needles have risen to 2/3 of their full height from knock-over and have their hooks towards the back of the m/c. The latch bar is in downward position and the guides are at the front of the m/c with the sinkers forward, holding the old overlaps in their throats so that they are maintained in the correct height on the needle stems.

knitting zone of tricot warp knitting machine
Fig: Knitting zone of tricot warp knitting machine

b) Needle rise and guide bar swing: With the sinkers forward holding down the fabric, the hooks and tongues rise, with the hook rising faster, until the head of the latter is level with the guide holes and is open. The guides then swing through to the back of the machine.

c) The overlap and return swing: The guide’s shog for the overlap and swing to the front of the machine immediately. The hooks and the tongues start to descend with the tongues descending more slowly, thus closing the hook.

d) Hook closing: The hooks and the tongues start to descend with the tongues descending more slowly, thus closing the hook

e) Landing: The sinkers start to withdraw as the needles descend so that the old loop is landed onto the closed hook. Thus the landing is occurred.

f) Knock-over and under lap: The sinkers start to withdraw as the needles descend so that the old loop is landed onto the closed hook and then knocked over as it descends below the sinker belly. At this point the under lap occurs before the needles begin their upward rise and sinker move forward to hold down the fabric.

g) The sinkers now move forward to hold down the fabric loops and push them away from the ascending needles, which are rising to the rest position.

Conclusion:
The knitting action of the Tricot warp knitting machine is done by the needles, its sliding latches and the guide bars. The main work of feeding the thread around the needle is done by guides with their shogging and swinging motions. By this experiment I learned about the knitting action of a tricot warp knitting machine. This experience will help me in my future practical life.

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