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Патент USA US2405162

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Aug. 6, 1946.
B. NYHUIS
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KNITTING METHOD AND APPARATUS '
. Filed‘ Sept. 16, 1944
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Patented Aug. 6,’ 1946
2,405,l62
UNITED STATES PATENT oFFIcE
2,405,162
KNITTING METHOD AND APPARATUS
Bert Nyhuis, Kankakee, Ill., assignor to Bear
Brand Hosiery (10., Chicago, 111., a corporation
of Illinois
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1
Application September 16, 1944, Serial No. 5571,1198
9 Claims.
(01. 66+“)
2
This invention relates to improvements in cir
opposite side of the cylinder. ' This ba?‘le, by
cular knitting machines and methods of knit
ting and its purpose is to provide improved means
for controlling the operation of such a machine
by the application of air under pressure at the
place where the stitches are formed. The inven
tion may be employed with particular advantage
to the air'jet, serves to direct the air down
wardly into the pocket of fabric as it is formed
so that this direction of the air current is a major
. in the operation of-a circular knitting machine
for producing seamless nylon hosiery having a
double welt portion around the top.
In the operation of a circular knitting machine
to make the welt portion of a stocking, the ma
chine starts on alternate. needles four courses of
fabric and this fabric is then taken off of the nee
dles. and held by transfer jacks while the needles
continue their operation in the knitting of the re
mainder of the fabric. When the knitting of the
welt fabric has been completed, the needles are
virtue. of its shape and its position with respect
factor in preventing the distortion and forma
tion of wrinkles which attend the making of the
fabric where such air directing means is not used.
By this method, the double welt fabric is pro
gressively formed while maintaining the oppo
site walls apart at the place of knitting and pre
venting the opposed parts of the inner wall of
the Welt from engaging each other at any time
during the knitting operation. These and other
15 objects and advantages of the present invention
will appear more fully hereinafter.
The nature of the invention will be understood
from the following speci?cation taken with the
operated to remove the initial stitches from the
accompanying drawing in which one embodiment
transfer jacks and then to knit a seam which 20 of the invention is illustrated. In the drawing,
completes the formation of the tubular top por
the single ?gure shows a vertical axial section
tion or welt.
through the principal portions of the upper part
.
of a circular knitting machine embodying the
The use of such a knitting machine in form
ing the welt fabric has given rise to- difficulty
when nylon yarn is employed because of the
features of the present invention.
As illustrated in the drawing, the invention is '
embodied in a circular knitting machine com
prising a needle cylinder . l l! which is suitably sup
tendency of the knitted fabric to bunch up and
form a tangled mass as the knitting proceeds,
with the result that distorted stitches and wrin
kles are present invthe welt portion of the com
pleted stocking, thereby giving it an unattrac
tive appearance. This problem has been solved,
to some extent, by the controlling method dis
closed in the United istates patent to R. C. Wil
ported for rotary movement about its vertical
axis and which is rotated or oscillated as re
30
quired in the making of seamless stockings by
suitable actuating mechanism not shown. Se
cured, to the needle cylinder I!) is a sinker,ring
ll carrying the web holders or sinkers l; which
liams, No..2,275,276, dated March 3, 1942,, accord
coact individually with the annular series of nee
ing to which a jet of air under pl‘?ssure is directed 35 dles l3 carried by the cylinder [9 during the knit
against the fabric as it is being formed, so that
ting operation. The web holders I2 are slidably
the fabric is projected inwardly within the needle
mounted for radial movement and are actuated
cylinder and held in an extended condition op
by a cam groove lie formed in an annular cap
posite the jet. This arrangement has not proved
to be entirely satisfactory, however, because the
40
portion of the fabric which is extended by the
jet tends to rub against the downwardly looped
fabn'c at the opposite side of the needle cylin
member 14 which rests upon the sinker ring H
and carries adjustable stop screws adapted to
engage a stationary post, not shown, for limiting
its angular motion in either direction. The yarn
feeding mechanism and other usual parts asso
ciated with the needles and the web holders are
upon itself and give rise to unsightly wrinkles (45 not illustrated since they do not in themselves
and surface formations which are only less ob
vconstitute parts of the present invention.
jectionable than those produced in the operation
The latch guard ring it of the machine carries
of machines not equipped with the controlling
an inwardly extending bracket [6 provided at its
device of said patent.
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inner end with a hub portion He in which is
These difliculties have been overcome by the
journaled, in axial alignment with the needle
so
present invention through the provision of im
cylinder [0, a shaft having secured to the lower
proved apparatus in which a jet of air under
end thereof a circular dial I‘! having radial guide
pressure, introduced in the knitting area between
ways, in which are mounted the loop holding hook
the needle cylinder and the hook carrying dial,
members or transfer jacks l8 which cooperate
is caused to carry the loop of knitted fabric 55 with alternate knitting’ needles l3 during ‘the
against a depending annular ba?le or shield
formation of an initial or set-up course for the
der, thereby causing the suspended fabric to twist
which extends downwardly from the rotary dial,
so that the fabric which is extended by the air
jet to keep its opposite layers apart is held by
the intervening baf?e from engagement with the
suspended loop or double layer of fabric at the '
stocking welt and also during the formation of the
seam which ?nally closes the welt. The dial I‘!
is rotated in unison with the needle cylinder l9
by suitable driving connections including ‘a shaft
19 having ?xed thereon a bevel pinion 2!) arranged
2,405,162
3
.
1. The method of controlling the formation of
the stitches in a fabric knitted by a circular knit
ting machine which consists in holding the fab
to mesh with a bevel gear 2| fixed upon the upper
end of the shaft which carries the dial. gAtjcer
tain times during the rotation‘, the‘loop holding
hooks l8 are actuated by retractable cams, not’
illustrated, carried by a cam plate 22 which is .
ric by air under pressure against a baffle located
on the inside of the circular fabric.
mounted in fixed position, and in coaxial relation
ship to the dial 11, upon the bracket l6. The
the stitches in a fabric knitted by a circular knit
_2., The method of controlling the formation of
ting machine which consists in directing air un
der pressure against the fabric as it is being
times during the rotation of the needle cylinder
10 formed and de?ecting the air current to hold op
as is usual in machines of this type.
posed parts of the fabric out of contact with each
At a point outwardly fromand somewhat above other.
'
the stitching station shown at the upper ‘left
3. ‘The method of controlling the formation of
side of the drawing, there is mounted a nozzle 25
the stitches in a tubular fabric knitted on a cir
which is connected by apipe 26 with a source of
cular knitting machine which consists ‘in direct
compressed air or the. like and the. nozzle is
ing. a current of air under pressure against the
directe'dso that the air'or other gas under pres
fabric as it is being formed and causing said cur
sure is directed inaa‘ jet or stream to a point just
rent to move axially of the tubular fabric to hold
above the place where the stitches are formed by
opposed portions thereof out of contact with
the needles I3 and below the adjacent web holding
each other.
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hook or jack [8. This air jet passes through the
4. In a circular knitting machine having an
gap between the ring H and the dial Hand. is
‘adapted to impinge upon the outer annular sur
annular series of needles for knitting a tubular
needles l3 are actuated by suitable cams at proper
face 2711 of a circular baffle or shield 2‘! which is
fabric, the combination of means for directing a
current of air under pressure against said fabric
as it is being formed to hold said fabric extend
ed, and supporting means located on the inside
of the annular fabric against which said fabric is
27*’ which extends around the lower end of the
forced by said air current.
In the operation of the machine, after the ini
5. In a circular knitting machine having an
tial courses of thewelt fabric 30 have been formed 30 annular series of needles for knittingv a tubular
by the knitting needles, theweb holding hooks is
fabric, the combination of means for directing a
are operated to take the fabric off of the needles
current of air under pressure against said fabric
‘and to hold ‘the upper'edge'thereof as shown in
as it is being formed to hold said fabric extend
the drawing; As the knitting operation con
ed, and a ba?ie mounted behind said fabric and
secured to the under Side of the dial H in concen
tric relationship thereto. The surface 21a tapers
downwardly and unites with a'cylindrical surface
balile.
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1tinues', the length of the annular piece of fabric 35 adapted to de?ect said air current axially of the
increases and itforms a progressively increasing
double walled loop extending downwardly be- »
tween the baffle 2-1 and the cylinder lil. During
tubular fabric.
6. In a circular knitting machine having an
annular series of needles for knitting a tubular
this knitting operation the air jet from the nozzle
fabric, the combination of means for directing a
25- carries the inner wall or layer of the fabric 40 current of air under pressure against said fab
against the surface‘ 2'!a and the surface 21b of ~ ric as it is being formed to hold said fabric ex
- the baffle so that the inner and-outer walls of
tended, and a baffle against which said fabric is
the welt are kept apart, in the region of the knit
forced by said air current, said bailie having an
ting'station. The air/jet is de?ected downwardly
inclined surface arranged to de?ect said air cur
from the surface 27*‘ and thus tends to hold the asii! rent axially of the tubular fabric.
'double'walled welt in concentric relationship to
7. Ina circular knitting machine having an
the cylinder it] as its length increases and, in
annular series of needles for knitting a tubular
‘addition, the presence of the baffle within the welt
fabric,rthe combination of means‘for directing a
fabric prevents the opposite portions of the inner
current of air under pressure against said fab
annular welt from contacting each‘ other as the 50 ric as it is being formed to hold said fabric ex
dial rotates and the length of the welt increases.
tended, and‘ an annular ba?ie positioned to be
The objectionable twisting of the suspended welt
within the forming tubular fabric with a part
fabric upon itself is thus overcome. This effect
thereof located in the path of travel of said air
may be increased or regulated by varying the
taper of the surface 213 and by varying the length 1
8. In a circular knitting machine having an
of the cylindrical surface 21'’. The action of the
annular series of needles for knitting a tubular
current.
air jet serves to maintain the welt extended and
the stitches under tension in the stitching region
so that a uniform product is obtained' Many
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of the advantages of the present invention may be
obtained by using the ba?ie alone, without any
fabric, the combination of means for directing a
current of air under pressure against said fab
no as it is being formed to hold said fabric ex
tended, and a ba?ie positioned to be within the
forming fabric and having a downwardly con
air current, in which case this member serves
merely as a shield to separate the opposed por
verging annular surface against which said fab
ric is forced by said air currrent.
tions of the inner wal lof fabric.‘ When the length
9. In a' circular knitting machine having an
annular series of needles for knitting a tubular
fabric, the combination of means for directing a
current of air under pressure against said fabric
as it is being formed to hold said fabric extend
of the welt fabric has increased to the desired
extent, the upper edge of the fabric is removed
from the hooks l8 and united with the outer por
tion of the fabric to form the completed welt.
One form of the invention has been shown and l -'
described by way of illustration, but v'it'will be
understood that it may be constructed in varie
ous other embodiments, and that the improved
method may be practiced in various ways, which
come within the scope of the appended claims. ,
I claim:
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ed, -a- b'a?ie positioned to be within the forming
fabric and having a downwardly converging an
nular surface against which said fabric is forced
by. said air current, said baflie also having a cy
lindrical surface extending downwardly from
said ?rstfnamed surface.
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BERT NY I-IUIS.
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