Question

In Weft knitting machine, the term 'Robbing back' is

• A. Transfer of loop from one needle to another needle
• B. Feeding of two yarn in one feeder
• C. Pulling of few length of yarn from newly formed loop
• D. Pulling of few length of yarn from already formed loop

Hint:

Robbing back is the pulling of yarn from adjacent, already formed loops to supply yarn to a newly formed loop. It's a consequence of yarn tension imbalances.

Answer 1

The Correct Option is D

Step 1: Understanding Weft Knitting: In weft knitting, loops are formed sequentially across the width of the fabric. Needles hold the previously formed loops while a new loop is created. 
Step 2: Defining "Robbing Back": "Robbing back" (also called "robbing") occurs when a newly formed loop pulls yarn from the adjacent, previously formed loops. This happens because the new loop needs a certain amount of yarn to form, and if there isn't enough slack in the yarn supply, it will take yarn from its neighbors. 
Step 3: Why Robbing Back Happens It happens due to these reasons: Low incoming yarn tension High fabric take down tension 
Step 4: Eliminating Other Options: (a) Transfer of loop from one needle to another needle: This describes a stitch transfer, a different knitting action. 
(b) Feeding of two yarn in one feeder: This describes plating or a similar technique, not robbing back. 
(c) Pulling of few length of yarn from newly formed loop: This does not accurately describe what robbing back is. It is the pulling of yarn from already existing loops, not the new one.