Stitch Formation Technique of Spring Latch Needle in Knitting Sector:
This type of needles has a rigid hook and latches which easily turning around the axis. It is mostly used in weft knitting machine. Here, the stem carries the knitted loop in the rest and clearing position. In another article I have shared loop formation or stitch formation technique of spring bearded needle. But now, i have presented here the loop formation technique of spring latch needle.
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| Knitting action of latch needle in textile knitting industry |
Loop Formation Technique of Spring Latch Needle in Textile Knitting:
The loop formation process in a single needle bed or single jersey knitting machine is illustrated in figure.
The stitch formation process is divided in to ten operations. Those ares-
- Clearing,
- Yarn lying or feeding,
- Under lapping or yarn drawing,
- Pressing,
- Landing,
- Joining,
- Casting off or knocking over,
- Loop forming,
- Sinking,
- Loop draw off.
All the above operations have explained in the below:
1. Clearing:
The process of formation loop started by clearing operation in latch needle. Its aim is ti draw the old loop below the latch. Sinker are constant and the latch is opened and when the needle in high position then this clearing operation performed.
2. Yarn lying or feeding:
While the needle motion is downwards, the hook take hold the yarn from yarn guide. Here, the new feed yarn stay below the hook.
3. Under lapping or yarn drawing:
The laying yarn is fertilized in the hook and the yarn is in tension when the needle comes down. In this situation, while the needle moves downwards yarn lying and under lapping occurs instantaneously.
4. Pressing:
The aim of pressing is to close the needle hook with the new feed yarn and needle moves downwards.
5. Landing:
Placed the old loop on the latch is called landing. In latch needle machine, pressing and landing operation performed instantaneously.
6. Joining:
Touching of new loops with the old loops is called joining. In this stage, the needle comes downwards.
7. Casting off or knocking over:
The old loops is completely release from the hook and then it falls on the new loops and in this stage, the stem of needle comes downwards too. Joining and casting off occurs simultaneously.
8. Loop forming:
Loop is formed here.
9. Sinking:
After making the loop its sink here for loop drawing off.
10. Loop draw off:
By formation of new loops along the horizontal a new course is made. By using take down mechanism, produced course is drawn downwards. Then again the loop formation process start and the needle come up.
