PURL KNITTING STRUCTURES

8/7/2019 PURL KNITTING STRUCTURES

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Presented by :-

UTKARSH SAROJ

D/BFT-AP/09/27


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A purl stitch is the reverse side of a knit stitch.

Its loop structure is a horizontal semicircle,whereas the knit loop is vertical and flat.

In forming a purl stitch, the movements are thereverse of those used for knitting.


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Purl fabrics are produced by meshing the stitchesin adjacent courses in opposite directions either byusing special latch needles with two needle hooksor by transferring the fabric from bed to bed

between each knitting action. When the fabric is stretched lengthwise, then the

face stitches are visible. The fabric shrinks more inthe direction of Wales, and once it is released, itrelaxes to hide the face stitches between the

courses. The interlooping of the stitches of adjacent courses

in opposite directions results in the courses of apurl knitted structure closing up. The structure,therefore, has a large longitudinal extensibility.


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Engagement of the head of the receiving slider with the needlehook that was

originally knitting from the opposing bed. 2 Cam action causing the head of the delivering slider to pivot

outwards from the trick and thus disengage itself from the other hook of the needle. 3 Sufficient free space to allow the heads of the sliders to pivot

outwards from their tricks during engagement and disengagement of the needles. 4 A positive action which maintains the engagement of the head of

a slider with a needle hook throughout its knitting cycle by ensuring that it is

pressed down into the trick.


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The dividing cam is an internally-profiled, cut-through recess in a flat plate, attachedhorizontally and externally to the cylinders at a

position half-way between them.


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technique is being generally introduced intodouble-cylinder half-hose machines,

although these have revolving cylinders. At the

moment of disengagement, the

spring-loaded cam presses onto the tail of thedelivering slider (D), causing its head

to swing away from the cylinder and todisengage itself from the needle hook. The

action is made possible by the tapering under-surface of the slider tail.


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This method is simpler and safer and operateswell at high speeds. The latch guard nose of theslider is extended and pointed to act as a latch-

opener as the receiving slider meets theapproaching head of the needle, whose latch isspecially shaped to facilitate the action. Thisaction reduces the danger of press-offs

occurring through latches closing onto emptyhooks.


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PURL KNITTING STRUCTURES

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