Welcome To My PresentationDepartment Of Textile engineering

Presented By: Md: Feroz Mahmud

ID: 130103023

TYPES

THE BEARDED

NEEDLE

3 TYPES OF KNITTING NEEDLES

THE COMPOUND

NEEDLE

THE LATCH

NEEDLE

the hook opening and

closing device

a system allowing the

needle to move and

form the loop.

the hook, which takes

and retains the

thread to be looped

• The bearded or spring needle was the first type of needle to be produced.

• It is the cheapest and simplest type to manufacture as it is made from a single piece of metal

• The bearded needle is essentially a frame needle, the needles being fixed to move

FEATURES

• The head, where the stem is turned into a hook to draw the new loop through the old loop.

• The beard, which is the curved downwards continuation of the hook that is used to separate the trapped new loop inside from the old loop as it slides off the needle beard.

• The stem, around which the needle loop is formed.

• The eye, or groove, cut in the stem to receive the pointed tip of the beard when it is pressed, thus enclosing the new loop.

• The shank, which may be bent for individual location in the machine or cast with others in a metal ‘lead’.

PARTS

BREADED NEEDLE AND KNITTING MACHINE PARTS

Knitting action

Advantages Limitation

• Less expensive• Strain on yarn is less• No possibility of fluff

or lint accumulation on needle

• Good for warp knitting machine

• Required an additional element to close the beard during knitting

• High wear and break easily

• Limiting productivity• A knitting section

occupies a considerable amount of space

• Individual loop formation has to be achived by a loop forming element, this leads to a more complicated

Latch Needle Characteristics:

1. Most widely used in weft

knitting.

2. More expensive needle than

the bearded needle.

3. Self acting or loop controlled.

4. Work at any angle.

5. Needle Depth determines the

loop length.

6. Variation of the height of

reciprocating produces knit, tuck

or miss stitch.

Characteristics

The Hook: The hook which draws and returns the new loop.The slot or Saw Cut: This slot receives the latch blade.

Features-hook

Features

The Cheeks or Slot Walls: It is either punched or riveted to fulcrum the latch blade.The Rivet: The rivet which may be plain or threaded. This has been dispensed with on most plated metal needles by pinching the slot walls to retain the latch blades.The latch blade: This latch blade locates the latch in the needle.

7. The stem: The stem of latch needle carries the loop in the clearing on rest position.8. The Butt: Butt of latch needle enables the needle to be reciprocated.9. The Tail: The tail is an extension below the butt giving additional support to the needle and keeping the needle in its trick

Features

The rest position: The head of the needle hook

is level with the top of the verge of the trick. The

loop formed at the previous feeder is in the

closed hook. It is prevented from rising as the

needle rises, by holding-down sinkers or web

holders that move forward between the needles

to hold down the sinker loops.

Knitting action

Latch opening: As the needle butt passes up the incline of the clearing cam, the old loop, which is held down by the sinker, slides inside the hook and contacts the latch, turning and opening it.

Knitting action-latch opening

Clearing height: When the needle reaches the top of the cam, the old loop is cleared from the hook and latch spoon on to the stem. At this point the feeder guide plate acts as a guard to prevent the latch from closing the empty hook.

Knitting action-clearing height

Yarn feeding and latch closing: The needle starts to descend the stitch cam so that its latch is below the verge, with the old loop moving under it. At this point the new yarn is fed through a hole in the feeder guide to the descending needle hook, as there is no danger of the yarn being fed below the latch. The old loop contacts the underside of the latch, causing it to close on to the hook.

Knitting action-yarn feeding

Knocking-over and loop length formation: As the head of the needle descends below the top of the trick, the old loop slides off the needle and the new loop is drawn through it.

Knitting action-cast off

Knitting Action Of Latch Needle

Advantages Limitation

• Major advantages of being self acting or loop controlled, so that individual movement and control of the needle enable stitch selection to be achieved.

• Ideally suited for use with computer controlled electronic selection devise.

• Latch needle can operate at any angle.

• Variation of the height of vertical can produce knit, miss and tuck loop which helps to manufacture different design fabrics.

• Latch needle are thick and rigid, so any deflection id design effect on fabric

• Needle deflection is difficult• It imposes a certain strain on

yarn• There is also possibility of

fluff or lint accumulation on the latch due to rubbing of the yarn on needle

Latch needle Spring bearded needle

1. It contains a hook portion

at the top & a latch reverted

at certain distance from the

needle head.

1. This needle consists of a

top hook curved downwards

with a finished tip.

2. The main element of

knitting is latch.

2. The downward

continuation is called beard.

3. The latch needles are

self-acting.

3. The spring bearded

needles are not self-acting

type.

4. Do not need outside

agency to close the hook.

4. It requires pressure to

close the needle.

Difference between latch and bearded needle

Latch needle Spring bearded needle

5. Machine gauge is coarser

then spring bearded needle.

5. Machine gauge is finer then

latch needle.

6. This one is not simple type

needle.

6. Simple type of needle.

7. It has reduced stroke. 7. It has more stroke than

latch needle.

8. Most widely used in weft

knitting.

8. More widely used in circular

single knitting.

9. Complicated operating

system.

9. Easy operating system.

10. The latch needle is more

expensive & intricate needle.

10. The spring bearded

needle is less expensive than

latch needle.

Difference between latch and bearded needle

Features

• Compound needles consist two separately controlled parts- the open hook and the sliding closing element (tongue, latch, piston, plunger)

• It is most popular in warp knitting machines• Strain in not put on the yarn• Both members of compound needle have a straight,

thus knitting speed can be increased.• These needle are very expensive

Compound Needle Action

Wonderful knitted Fabrics