Knitting Practical

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  • Topic: Knitting, Ribbing, Gauge
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  • Published : May 31, 2013
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KNITTING TECHNOLOGY PRACTICAL-02| |
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Title:Activities of the different knitting elements in circular knitting machine.

Practical:
a) Main knitting elements and their functions
b) Loop formation in Single Jersey & Rib Kitting process
c) Mechanism of forming Tuck & Miss stitches

a) Main knitting elements and their functions
NEEDLES
The needles are the most important stitch forming elements. They are displaced vertically up and down and are mounted into the tricks or cuts of the knitting cylinder. There are three types of needles namely:

1. Latch needle
2. Spring bearded needle
3. Compound needle.
We can divide a needle into three main parts:
A. The hook, which takes and retains the thread tube looped; B. The hook opening and closing device, that allows the hook to alternatively take a new thread and release the previous one; C. A system allowing the needle to move and form the loop.

1=Butt2=Butt height3=Back shank4=Stem5=Crimp
6=Groove7=Cheek8=Hook9=Hook width10=Latch11=Rivet

SINKER
The sinker is the second primary knitting element. It is a thin metal plate with an individual or a collective action operating approximately at right angles from the hook side of the needle bed, between adjacent needles.

1=Butt2=Butt breadth3=Height of shank
4=Buldge5=Neb6=Length of neb
7=Throat angle8=Sinker platform height
9=Breadth of lower shank 10=Clearance
11=Throat

SINKER OPERATION
1. The held loop is positioned in the throat of the sinker when the sinker moves forward and the needle moves upward for clearing. 2. The sinker remains at its forward position when the needle attains its clearing position. 3. The sinker retracts when the needle comes down after feeding. 4. Sinker remains in backward position and the needle descends to its lowest position drawing the new loop through the old one. 5. Before the needle ascends, the sinker moves forward to push the knitted fabric a little and to hold the old loop away from the head of the needle and to be in a position to control the fabric.

NEEDLE BED
The needle-bed of a knitting machine is made up by the needles. The needles can be all fixed on the same needle bar or can be driven individually in a grooved plate, according to the type of knitting machine.

All knitting machines can be equipped with one or two needle-beds, according to the model.

DIAL
Dial is the upper steel needle bed used in double knit machines. Into the grooves of the dial, the needles are mounted horizontally and are allowed to move radially in and out by their dial cams. The number of grooves per unit space conforms to the cylinder gauge in most of the cases.

CYLINDER
The cylinder is a steel circular bed having grooves/tricks/cuts on its outer periphery into which the needles are mounted. With reference to the tricks, the needles move vertically up and down by their butt being in contact with the cam track. The number of tricks per inch i.e., number of needles per inch decides the gauge of the machine. Machines are built as low as 4 NPI to as high

as 32 NPI. Based on the machine gauge, the fineness of the yarn to be knitted can be varied. The diameter of the cylinder also varied based on the type and width of the fabric and a maximum of 75 cm diameter machines are available.

CAMS
The knitting cams are hardened steels and they are the assembly of different cam plates so that a track for butt can be arranged. Each needle movement is obtained by means of cams acting on the needle butts.

The upward movement of the needle is obtained by the rising cams or clearing cams. The rising cam places the needle at a certain level as it approaches the yarn area. Cams controlling the downward movement...
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