Knitting Cycle of the Bearded Needle Tricot Machine

Warp knitting machine is two types; one is tricot warp knitting machine and another is raschel warp knitting m/c. In this article I will explain knitting cycle of the bearded needle tricot machine in step by step. But before going to knitting cycle we should know about tricot warp knitting machine. Tricot machine has a gauge expressed in needle per inch and chain link numbering 0, 1, 2, 3, 4 etc. generally with three links per course. There sinkers which are joined to each other at the front and back. Tricot warp knitting machine is ideal for the high speed production of simple. Knitting action occurs at gentle and low tension.

Knitting Cycle of the Bearded Needle Tricot Machine:

Figure A: illustrates the knitting cycle of the bearded needle tricot machine

1. The rest position (a). The needles have risen to 2/3 of their full height from knock-over and have their beards towards the back of the machine.The presser is withdrawn and the guides are at the front of the machine with the sinkers forward, holding the old overlaps in their throats so that they are maintained at the correct height on the needle stems.

2. Backward swing and overlap shog (b, c). After swinging through the needles to the beard side, the guides are overlapped across the beards, usually by one needle space in opposite directions.

3. The return swing and second rise (c, d). As the guides swing to the front, the needles rise to their full height so that the newly-formed overlaps slip off the beards onto the stems above the old overlaps. This arrangement reduces the amount of guide-bar swing necessary and therefore the time required.

4. Pressing (e). The needle bar descends so that the open beards cover the new overlaps. There is a slight pause whilst the presser advances and closes the beards.

5. Landing (f). As the sinkers withdraw, the upward curve of their bellies lands the old overlaps onto the closed beards.

6. Knock-over and underlap shog (g). The presser is withdrawn and the continued descent of the needle bar causes the old overlaps to be knocked-over as the heads of the needles descend below the upper surface of the sinker bellies. The underlap shog which can occur at any time between pressing and knock-over usually occurs in opposite directions on the two guide bars.

7. 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. 
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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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