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Патент USA US2408700

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Oct. 1, 1946.
2,408,698‘ 1
N. H. SMITH’
mun-Ins lmcnnm Am) METHOD 'oF mum-me
Filed Oct. 21, 1944
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2,408,698
Patented Oct. 1, 1946
UNITED STATES PATENT OFFICE
KNITTING
AND METHOD OF
-‘
KNITTING
assignor to
Norman H. ‘Smith, Pawtucket, R. 1., R.
1.,- a cor-'
Hemphill Company, Central Falls,
poration of Massachusetts
,
I
Application October 21, 1944, Serial No. 559,775
'
4 Claims.
1
This invention relates to a new and useful im
provement in knitting machines of the type hav
ing two axially opposed needle cylinders and to
a method of knitting upon this type of machine.
More speci?cally, this invention relates to sinkers
associated with the lower cylinder and adapted
to cooperate with the needles in the drawing of
(01. 66-14)
quality of the fabric as a whole and of the indi
vidual loops which- is very marked.’
1 On‘e'form of the invention is shown‘ in the draw
ing of which:
Fig. 1 is an elevation largely in section of a part
of a two cylinder knitting machine showing the
upper end of the lower cylinder, a needle arranged
to operate therein, a sinker and the sinker cam;
yarns and to a novel manner of operating these
Fig. 2 is a similar view showing the needle and
sinkers to carry out the method.
sinker
in a different position; and
Two cylinder machines of this type are widely 10
Figs. 3 and 4 are views illustrating the method
employed for knitting true rib fabric and also
of knitting in which the yarn is drawn over the
knitting a combination of true rib and plain fab
backs
of the sinkers.
ric. For the knitting of plain fabric the lower
In Fig. 1 the upper end of the lower cylinder
cylinder only is utilized and sinkers are asso
is shown at l. Af?xed to this is an arcuate sinker
ciated therewith to enable the needles to draw 15 guide 2 upon which an arcuate sinker 3 is adapted
yarn and to knit loops. '
'
Heretofore the yarn has been drawn in the
throats of the sinkers. The result of this is that
when the sinkers move to cast off knitted loops
to rock radially of the cylinder. The rocking of
sinker 3 is controlled by a cam 4 having a cam
track 5 of appropriate shape to rock sinker 3 in
the desired directions and to the desired extent
from the needles they necessarily act not only 20 at the desired times.
upon the knitted loops but also upon the yarn
In order to draw the yarn over the backs 6 of
which has just been drawn. This yarn is com
the sinkers the sinkers are moved in soon enough
paratively unstable at this time so that any lack
and far enough for the purpose. This is shown
of uniformity in the sinkers or the needles or in
in Fig. 1, the newly drawn sinker and needle
their actual or relative motions is reflected in the 25 loops being indicated at l and 8, respectively. As
lengths of the loops. Also there is likely to be a
will be seen, the corresponding sinker loop 9 of
lack of uniformity in the shapes of the loops, one
the preceding course is in the throat of the sinker.
side differing from the other or whole loops tilt
Consequently, when the sinkers move in still fur
ther to cast off the adjacent needle loop 10 it will
ing from the perpendicular.
By the method of'this invention the loops are 30 act upon sinker loop 9 only, the newly drawn
sinker loop 1 upon the back 6 of the sinker being
drawn over the backs of sinkers behind the nibs
on a surface having a de?nite height. Thereafter
unaffected. To insure that this motion of the g
sinker has no effect upon loop l, back 6 is shaped
the loops are transferred from the backs to the
throats of the sinkers overthe tops of the nibs. 35 to an arc concentric with the are through which
the sinker rocks.
In this way, the casting off is accomplished by
Fig. 2 shows a, further step in the knitting oper
the sinkers acting upon the completed and com
ation
after the needle has risen again. The new
paratively stable loops of the preceding course.
needle loop 8 has now moved from the- hook to
The newly drawn loops, being on the backs of
the shank of the needle but the adjacent sinker
the sinkers behind the nibs and able to move
loop 1 is still over the back of the sinker.
freely upon them, take no part in the casting off
Fig. 3 also illustrates this condition, two sinker
operation and are unaffected thereby.
loops 1 being shown over the backs of two adja- .
Also when the sinker loops pass over the ‘nibs on
cent sinkers and around the shank of the inter
their way to the throats of the sinkers they are
vening needle H. Loops 9 are in the throats of
stretched slightly so that the adjacent needle
the sinkers, the needle loop [0 having been pre
loops are tightened around the needles. This
viously
cast off.
has an equalizing effect upon the needle loops.
Fig. 4 illustrates a further step in the method of
When the needles go down to knit the sinker loops
knitting in which the ‘sinkers have been moved
undergo a similar equalizing experience as the
out so that the new sinker loops 1 have been
50
needle loops are stretched by their passage over
transferred from the backs to the throats of the
the enlargedportion of the needles adjacent the
sinkers over the tops of the nibs prior to drawing
latch pivots.
'
more yarn over the backs of the sinkers for
All of these things, particularly thecasting off
another course.
of needle loops by the action of the sinkers upon
This method of knitting is hardly necessary for
the sinker loops only, cause improvement in the 55
a,
2,408,698
4
the comparatively heavy coarse gauge fabrics
ordinarily produced upon two cylinder inde
pendent needle knitting machines but is practi
cally essential for the production of ?ne gauge
fabric of the highest grade and for securing the
best possible plating and wrap patterns. Draw
ing the yarns or yarn over the backs of the sink
ers makes it possible to apply methods for plat
ing and for the production of wrap patterns which
cannot be taken advantage of when the throats
of the sinkers are used and which are essential >
to production of the highest quality.
I claim:
'
the adjacent sinker loops only and transferring
the newly drawn loops from the backs to the
throats of the sinkers over their nibs.
2. For a knitting machine of the superposed,
co-axial cylinder, independent needle type, a
sinker adapted to move in an arcuate path rela
tive to the cylinders and having a yarn drawing
surface behind the nib shaped to an arc concen
tric with said path.
10
3. For a knitting machine of the superposed,
coaxial cylinder needle type, a sinker adapted to
swing about a center and having a yarn drawing
surface behind the'nib shaped to an are con
centric with said center.
15
4. For a knitting machine of the superposed,
independently operated needles and sinkers each
coaxial cylinder needle type, a sinker adapted to
movable in an arcuate path relative to the cylin
swing in a vertical plane about a center and hav
ders and having a back shaped to an are con
ing a yarn drawing surface behind the nib so
centric with said path which includes the steps
shaped that every point when positioned to be
of drawing loops over backs of sinkers behind the
contacted by a yarn will be at the same height
nibs and through the corresponding needle loops 20 with
respect to said cylinder.
of a previous course casting o? the needle loops
of the previous course by the sinkers acting upon
1. A method of knitting upon a knitting ma
chine having opposed, axially aligned, cylinders
NORMAN H. SMITH.
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