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KNITTING ELEMENTS
SINKERS
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The Sinker is the second primary knitting
element.
It is a thin metal plate with an individual or
collective action operating approximately at
right angles from the hook side of the needle
bed, between adjacent needles.
Introduction to Sinker
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Objectives of the Sinker
It may perform one or more of the following
functions, dependent upon the machines
knitting action and consequent sinker shape
and movement.
Loop Formation
Holding Down
Knocking Over
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Loop FormationThe main objective of the
sinker is to assist theneedles in loop formation
by sinking or knitting the
newly laid yarn into a
loop.
As its forward edge of
catch (C) advantages
between the two
adjoining needles.
This is only for bearded
needle.
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Holding Down
It is the more common function of the sinker on
modern machines.
It holds down the old loops at a lower level ofthe needle stems than the new loops that are
being formed, and prevents the old loops from
being lifted as the needles rise to clear them
from their hooks.
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Knocking Over
The third function is
a knocking over at
which the needlepasses through the
old loop by drawing
a new loop.
Here, its upper
surface or belly
(B) supports theold loop as the
new loop is
drawn through
it.
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Role Of Sinker In Various Machines
Tricot Warp Knitting Machine
V-Bed Flat Weft Knitting Machine
Circular Weft Knitting Machine
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Tricot Warp Knitting Machine
Objective: A slot or throat is cut to hold or control the loop.
The sinker belly is shaped to assist with landing as well
as knock-over.
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Role in the Tricot Knitting Cycle
0- knocking over position: The sinker bar moves forward into
the holding down position.
60- holding down: The sinker bar is in the forward holding
down position,
120 - swinging through of guide bars & 185- overlapping of
the warp yarns: Holding Down position of the sinker is
slackened.
315- closing of the needles and casting off: The sinker bar
has reached the foremost position.
330- beginning of casting off: The yarns laying into the hooks
are passed through the loops being cast off to the form new
loops.
The sinker bar starts to move forward.
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V-Bed
Sinkers help to hold the fabric in
position down between the
needle beds during the clearing
part of the knitting cycle.
During the knock-over
part of the needle cycle,
the sinkers retract so that
the knock-over of the oldloops can take place.
http://www.knitepedia.co.uk/browse/knit_tech/knit_tech/V_bed_machine/viewer/V_bed__mach_tech_img_1695_1.htmhttp://www.knitepedia.co.uk/browse/knit_tech/knit_tech/V_bed_machine/viewer/V_bed__mach_tech_img_1695_1.htmhttp://www.knitepedia.co.uk/browse/knit_tech/knit_tech/V_bed_machine/viewer/V_bed__mach_tech_img_1695_1.htm -
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Special Feature
They are particularly effective when selected
needles along the bed are producing loops at
a faster rate than others, i.e. during multipletucking or holding when fabric is not being
produced uniformly across the width of the
machine.
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Circular Weft Knitting Machine
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b)
a)
c)
d)
e)
Role of Sinker Inthe Knitting Cycle.
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a) The sinkers have moved forward so that the fabric is held by
the sinker throats.
b) , c) and d) show the knitting cycle with the sinkers first moving
forward to grip the fabric prior to clearing .
c) shows yarn feeding with the feeder moving towards the
viewer and positioning the new yarn across the open hook of
the needle.
e) shows the needle moving down after knock-over to draw the
new loop.
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References
www.knitopedia.co.uk
www.newagepublishers.com
www.warpknitting4u.com
Books
Knitting Technology by David J. Spencer Textile- Reference Book For Knitting
http://www.knitopedia.co.uk/http://www.newagepublishers.com/http://www.warpknitting4u.com/http://www.warpknitting4u.com/http://www.newagepublishers.com/http://www.knitopedia.co.uk/ -
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