The components operating during the stitch formation cycle on flat single-bed warp knitting machines with spring beard needles are the following: the needles - the guide bars - the sinkers - the presser.
Picture 131 shows the various steps of the stitch formation cycle and the diagram of the machine movements, which shows the paths of the various components operating during a single revolution of the driving shaft.
With the needle in its standstill position, the thread is fed and laid over the needle stop; the sinker withdraws slightly to reduce the thread tension during the feeding step.
The needle cannot lower since it is still touching the presser; therefore the sinker is withdrawn so that the stitch in the throat can move upwards along the slant section of the throat and above the hook.
6. The presser withdraws and the needle starts lowering again; the stitch moves above the hook and once the needle has reached its bottom position, it knocks over on the next yarn, thus creating a new stitch. In the meantime the sinker has withdrawn and now holds the fabric with its breast.
The guide can now move sidewise for the floating movement.
Was this article helpful?