Study on four truck circular knitting machine.
Introduction:
Most single-jersey fabric is produced on circular machines whose latch needle cylinder and sinker ring revolve through the stationary knitting cam systems that, together with their yarn feeders, are situated at regular intervals around the circumference of the cylinder. The yarns is supplied from cones, placed either on an integral overhead bobbin stand or on a free-standing creel, through tensioners, stop motionsand guide eyes down to the yarn feeder guides.
Different parts and their function:
- Creel: Creel is used to contain yarn packages and supply yarn.
- Cone holder: Cone holder holds cone package.
- Yarn tube: Yarn is passed through yarn tube so that fly ash cannot fly on yarn and this tube protects yarn from yarn breakage.
- Yarn cleaner: If there is any slub in the yarn, yarn cleaner defects it by showing red signal.
- Magnetic yarn tensioner: Yarn pass in correct tension through the tensioner; especially magnetic yarn tensioner helps in maintaining proper tension.
- Sensor: Sensor stops m/c automatically if there in any problem in the machine.
- Yarn reserver (positive): Yarn is reserved here because yarn breakage many cause sudden shortage of yarn supply. Yarn reserver supplies yarn in regular tension.
- Yarn guide: Form creel to needle, there are many yarn guide to create yarn supply path.
- VDQ pulley: This part is used to control correct stitch length of knitted fabric.
- Feeder: Feeder locates close to the needle and feeds yarn to the needle.
- Needle detector: Needle detector defects broken needle in knitting machine.
- Latch needle: This type of needle has a special sliding latch with other common features. This part is used to form loops.
- Sinker: There are three types of sinkers:
- a) Loop forming sinker: This sinker is used to hold down the old loops.
- b) Holding down sinker: This sinker is used to hold down the old loops.
- c) Knocking-over sinker: This sinker supports the old loop as the new loop in drawn through it.
- Cam box: There are three types of cams in cam box-
- Knit cam: This cam helps needle to form knit loops.
- Tuck cam: This cam helps needle to form tuck loops.
- Miss cam: This can helps needle to from miss loops.
- Cam: Needle gets vertical motion by staying in contact with cam.
- Take –up roller: This part is used to take up the fabric from cylinder.
- Adjustable Fan: This part is used for removing lint, hairy firer from yarn and others.
- Cloth roller: The final product i.e cloth is wound on the roller.
- Expander: This part is used to control the with of fabric.
Calculation:
- Total needle:=π x D x G
= 3.1416 X 22’’ X 24
= 1657.92
=1658
- of cam= 66 x 4
=264
- of feeder=66 (Active 64, Gate 2)
- of cam box=66
- No of sinker=No. of needle
=1658
- Feeder density=Total number of feeder/cylinder Dia
=66/22’’=3
- Needle pitch:1/G=1/24=0.042
- Sinker cam box=22
- Came for gate=2 x 4=8
(1)
Study on four truck circular knitting machine.
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