On automatic machines, the transfer of stitches from one bed to the other is carried out by means of special needles: the lateral spring needles or the niche needles
The most common type is the lateral spring needle (picture 49); it is made up of a spring, whose end is fixed on one side of the needle stem.
The upper end is free to allow the passage of the needle hook of the opposite bed.
The carriage includes both the knitting and the transferring cams, divided into transferring cams and receiving cams.
Picture 50 shows the transfer cycle of the stitches carried out by means of lateral spring needles.
The transfer technique also allows the production of full-fashioned cloths by applying the increasing and narrowing technique.
This provides higher quality in the production of knitted goods.
The only inconvenience is represented by longer processing times with higher manufacturing costs.
The last generation of electronic machines can transfer and knit during the same carriage stroke and also offer tensioning and stitch transferring options to adjust the fabric tension according to the work area.
These technical improvements reduce the work time necessary for carrying out the full-fashioning process considerably, guaranteeing better results and improved cost efficiency.
Step A: needle 1, which must transfer stitch 2, raises on the transferring cam, whose special profile takes the transferring cam to a height exceeding the looping plane; in the meantime the stitch lowers on the spring; needle 3 on the opposite needle-bed starts raising on the receiving cam.
Step B: hook 5 of the receiving needle enters the spring 4
Step C: the hook of the receiving needle is completely inside the spring; the transferring needle starts lowering; the loop on the spring closes the latch and is left on the receiving needle.
Step D: the transferring needle is empty when it reaches the knock-over plane; the receiving needle knocks over and keeps the received stitch inside the hook.
Picture 50 - Transfer cycle of the stitches with lateral spring needles
Was this article helpful?