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Патент USA US3052116

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SePt- 4, 1962
G. LUMSDEN
3,052,108
METHOD OF AND MACHINE FOR MAKING KNITTED FABRIC
2 Sheets-Sheet 1
Filed May 3, 1961
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BY
Sept. 4, 1962
G. LUMSDEN
3,052,103
METHOD OF AND MACHINE FOR MAKING KNITTED FABRIC
Filed May 5, 1961
2 Sheets-Sheet 2
j ' .5
%
INVENTOR.
6egrye [mm/£20
-
BY
?ab-"L (QM
3,052,108
ite "
Patented Sept. 4, 1962
2
3,052,108
METHOD OF AND MAQHINE FOR MAKING
KNITTED FABRIC
George Lumsden, 348 Hunnewell St, Needham, Mass.
Filed May 3, 1361, Ser. No. 107,438
14 Claims. (Cl. 66-69)
This invention pertains to a novel method of making
knitted fabric, and to a knitting machine for use in the
weight, more porous, more permeable to air and mois
ture than the customary fabrics, and has a surface which
is substantially devoid of ribs and thus smoother and
softer to the touch than the materials ordinarily used.
A further object is to provide improvements in a knit
ting machine of a well-known type whereby said method
may be practiced readily and automatically and at high
speed.
Heretofore in the manufacture of fabrics of this gen
practice of this method, in particular, to a straight-bed 10 eral type, it has been customary to employ a straight
bed knitting machine wherein one only of the needle
knitting machine of the kind wherein a frame supports
beds is movable longitudinally, relatively to the frame
two opposed needle beds, each provided with parallel
and so to actuate this machine as to produce what is
needle grooves and with a hooked needle having an
known as a “rack stitch fabric.” In customary practice,
actuating butt in each groove, together with means for
feeding yarn to the needle hooks and cam means for 15 after the formation of each course of stitches, the single
movable needle bed is shifted relatively to the other
actuating the needles, and relates more especially to a
needle bed a distance equal to the spacing between two
adjacent needles, being moved ?rst in one direction and
tomary knitted fabric, is elastically stretchable in the
then in the other by the same amount. This results in
longitudinal direction to, at least, as great a degree as it
20 a fabric which may be somewhat smoother than the
is transversely.
usual rib~knitted fabric, but has substantially the same
Knitted fabric is extensively employed in garment
stretch characteristics as the latter.
manufacture, because of its ability to stretch elastically,
In accordance with the present invention, in the knit
thus permitting it to conform readily to the anatomy
ting of the novel material, both rows of needles are
while, at the same time, affording freedom of motion.
However, usual knitted fabric is capable of stretching 25 shifted longitudinally, but in opposite directions, and
simultaneously, after the knitting of each course of
to a much greater extent transversely of its width than
stitches. Such shifting of the needle beds could be done
in a direction at right angles thereto, and this is par
as a manual operation, but is preferably carried out by
ticularly true of ribbed fabric such as is produced upon
mechanical means such as the machine herein disclosed.
a knitting machine employing two sets of needles. When
The unexpected, surprising and highly useful result of
the material is to be made elastic by the introduction of 30
this practice is that the knitted material, so produced,
rubber elastic threads, it is usual to employ a ribbed
is substatnially less stretchable transversely of the needle
fabric, because of the ease with which rubber threads
Wales than the usual racked fabric, although highly
may be laid into the fabric structure Without requiring
stretchable and elastic longitudinally. The fabric is
that the rubber threads be drawn into stitch loops.
alike on both sides and is substantially devoid of any
35
For use in knitting certain types of garment, it would
thing resembling the customary longitudinally extending
be preferable (whether or not rubber elastic threads are
needle wales or ribs, such as those of ordinary one-and
to be incorporated) to employ a knitted fabric at least
one ribbed fabric. Under magni?cation the fabric ap
as stretchable in the direction of the needle wales as in
pears as a lacy structure with the legs of the stitch loops
a direction at right angels thereto. For example, in the
extending diagonally, those on one face sloping in one
manufacture of supporters for athletic use, knitted ma
direction and those on the other face sloping in the
terial is customarily employed in making the pouch
opposite direction, the angle of slope being, for exam—
like portion, which is ordinarily only a few inches in
ple,
45°. This fabric has but slight resemblance to
width, so that to out such a piece from wide knitted
usual racked fabric.
goods would involve the formation of marginal hems
machine designed to knit fabric which, unlike most cus
Q.
which is not practical because of the cost as well as the
In a machine, such as that herein described, wherein
the needles are actuated by cams, it is obvious that
increase in thickness at the margins. Thus, the fabric
preparatory to racking the rows of needles the cams
employed for the purpose is a selvage knit material
must have been moved out of operative engagement
which, as knitted, is of approximately the desired width
with all of the needle butts. In the customary straight
of the garment part to be made. This obviously means
50 bed machine, in which the cam carrier reciprocates, it
that when using customary knitted goods, the needle
is usual to provide two stitch cams spaced apart in each
wales extend lengthwise of the material, that is to say,
cam set, the rearmost of these stitch cams actuating the
parallel to the selvages and since such material is more
needles to draw stitch loops as the carrier moves in
stretchable transversely than longitudinally, the resultant
one direction in forming a course of stitches, the fore
garment, even though providing a reasonable ‘degree of
55 most of the two cams being idle so far as purposeful
support when new, tends to become permanently
actuation of the needles is concerned during the forma
stretched transversely as the result of use and of launder
tion of said course of stitches. It is obvious that, since
ing and so, quickly loses its usefulness. An object of
both stitch cams must have disengaged the needles be
the present invention is to provide a novel method of
fore the racking operation of the needle beds can take
making knitted material having selvages extending paral
lel to the needle wales and of a width suitable for use
in making garment parts of the above type, but which
is su?iciently stretchable and elastic longitudinally of
the needle wales to possess the requisite ability to con
60 place, both cams must traverse the entire row of needles
during the knitting of each successive course.
In the
making of ordinary knitted material, by reciprocating
knitting, that is to say, wherein the cam carrier moves
?rst in one direction and then in the other, the idle
form to a curved contour. A further object is to pro 65 motion of the foremost cam of the set causes no di?i
vide a novel method of making a fabric which is ac
culty, but it has been found that in knitting on a ma-'
ceptable for the desired purpose, but which may be made
chine, such as above described, wherein the two needle
at a cost substantially less, both as respects the amount
beds are racked in opposite directions after the knitting
of material employed and the speed of manufacture,
of each course, the yarn is so tensioned that if the idle
than that of the usual fabric employed in such garments, 70 cam be permitted to remain in its normal position on
and which, while retaining the desired functional char
acteristics, for a substantial period’ of time, is lighter in
the cam carrier, in performing the idle stroke, its ac
tion on the needles carrying the yarn laid during the
3,052,108
3
ii
next preceding course may cause yarn breakage. For this
tending rails or bars 22a and 22b, respectively, of the
reason, the present invention contemplates the automatic
setting of the forward stitch cam preparatory to its idle
cam carriage or ‘carrier 22 which is moved by suitable
means, customary in the art, longitudinally of the needle
stroke, so that, as it passes the needles, it does not in any
beds, so as to actuate the needles of both beds simulta
way actuate or prevent motion of the needles such as
neously in the formation of stitches. Since the means
for moving the cam carriers is conventional and well
might result in breakage of yarn.
Apparatus wherein the above results are attainable is
known in the art, it is not herein illustrated.
disclosed in the annexed drawings wherein:
As shown in FIG. 1, the machine is provided with ten
sioning rolls 23‘ and 23a which are driven at suitable
rear section of a generally conventional straight-bed 10 speed by conventional means (not here shown) for draw
knitting machine of the “Lamb” type, but showing the two
ing off the knitted web W as it is formed by the needles,
longitudinally movable needle beds of the present inven
the yarn being fed to the needles by the yarn guide Y,
tion, each having a row of hooked needles mounted in
which is supported by and moved with the cam carrier 22.
grooves therein, and also showing portions of the car
In accordance with the invention, each of the needle
riage upon which the needle-actuating cams are mounted; 15 beds 21 and 21a is mounted to slide longitudinally in
FIG. 2 is a diagrammatic, fragmentary plan view illus
suitable guideways such, for example, as are provided
trating the two sets of needles as they are disposed when
for guiding the single movable bed in prior rack-stitch
the two needle beds occupy one of their relative opera
machines.
FIG. 1 is a diagrammatic, transverse, vertical, front-t0
tive positions;
As here diagrammatically illustrated, merely by way
FIG. 3 is a ‘view similar to FIG. 2, but showing the 20 of example (FIG. 4), the needle bed 21 is provided with
relative arrangement of the needles of the two rows
an extension L at one end carrying a cam follower ele
when the needle beds have been racked to their other
ment K (FIG. 4a) which engages a groove in a rotary
operative positions;
cam I ?xed on a shaft W, while the needle bed 21a is
FIG. 4 is a fragmentary diagrammatic plan view of
provided with a similar extension L' having a cam fol
the machine of FIG. 1, to smaller scale, omitting all of 25 lower (not shown), like the element K, which engages
the cam carrier except one end portion thereof and in
a cam groove in a cam I’ ?xed to the same shaft W.
dicating means whereby the needle beds may be racked
in opposite directions in accordance with the present in
cam I is provided with external gear teeth which mesh
with a pinion H ?xed to the main cam shaft k of the
vention;
machine, the pinion H being half the diameter of the gear
FIG. 4a is a fragmentary elevation showing one of
the needle-bed shifting cams;
FIG. 4b is a section on line 4b—4b of FIG. 4 showing
a portion of the cam carrier;
with which it meshes. Thus the cams I and I’ make a
one-half turn for each rotation of the main shaft. The
The
cam grooves are so contoured that as the shaft k turns,
the needle beds 21 and 21a are simultaneously moved
FIG. 5 is an elevation showing the cam carrier re
in opposite directions, each bed moving a distance equal
moved from the machine and so arranged that one side 35 to the space between adjacent needles, and each coming
rail is in the vertical plane, with the means for shifting
to rest before the cam carriage begins its advance move
the stitch cams of one set mounted thereon, and in broken
ment and dwelling until the cam carrier has completed
lines indicating the positions of the corresponding ?xed
stops relatively to the cam carrier, whereby the mech
anism is caused to shift the cams prior to the knitting
of each course of stitches;
FIG. 6 is a fragmentary view, to larger scale, show
ing the inner side of the rear rail of the cam carrier with
one set of knitting cams in the position which they occupy
its stroke.
In FIGS. 2 and 3, relative positions of some of the
needles in each of the beds 21 and 21a, respectively, is
diagrammatically indicated by the characters A to G
inclusive, and by the characters II to XIII inclusive.
Thus, as illustrated in FIGS. 2 and 3, and assuming
that the cams have placed the two needle beds as shown
as the cam carrier moves in the direction of the arrow
in FIG. 2, so that the needle A, for example, is opposite
the space between the needles II and III and that the
needle beds dwell in this relative position while the cam
direction;
carrier makes an operative stroke feeding the yarn to
FIG. 7 is a view (to slightly smaller scale than FIG. 6)
the needles of the two sets and thus knitting a course of
showing the cam-supporting plate which is secured to 50 stitches, the cams I and I’, before the cam carrier starts
the rear rail of the cam carrier on which the cams are
its return journey, move the needle beds in the directions
mounted, but with the cams removed, and illustrating the
of the arrows M and N (FIG. 3), each a distance equal
crank discs whereby the cams are shifted and the slots
to the space between two needles, with the result that
for guiding, the cams in their movements;
the needle C of the bed 21 now stands opposite the space
FIG. 8 is a fragmentary elevation of the outside of the 55 between the needles ‘II and III of the bed 21a. With
bar 22:: of the cam carrier, showing the bearings for
the needle beds in this position, another course of stitches
the carn~actuating shafts of one set; and
is knitted and then the needle beds are moved back by
FIG. 9 is a side elevation, to larger scale, showing one
the cams I and I’ to the position of FIG. 2», whereupon
of the cam-actuating shafts removed from the cam car
the next course of stitches is knitted and then the needle
rier.
60 beds are again moved to the position of FIG. 3 and so on.
Referring to the drawings, FIG. 1 illustrates, in a dia
It has heretofore been customary to make what is
grammatic way, a straight-bed knitting machine of the
known as “racked knitting” by moving one needle bed
general type known as a “Lamb” machine, such machines
one needle space, then knitting one course, and then rack
being basically like that originally disclosed in the patent
ing it back before the next course, and so on, and it
to Lamb, No. 39,934, dated September 15, 1863, such
has also been suggested to make ornamental racked fabric
machines, as shown in FIG. 1, having, mounted upon a
in which one needle bed may be racked one step at a time
suitable frame 20, two needle beds 21 and 21a which
several steps in the same direction and then back again,
are inclined upwardly toward each other and which
one step at a time. However, while the fabric made by
are provided with grooves in their upper surfaces for the
so racking one of the needle beds is distinct in appearance
reception of the shanks of needles N1 and N2, here shown 70 from ordinary one-and-one rib fabric, such as would re
as latch needles having hooks at their upper ends and
sult from continued knitting on the needles as arranged
butts T engageab-le by the knitting cams, whereby the
in FIG. 2, course-after-course, any racked fabric as here
needles are moved in the formation of knitted stitches.
tofore made exhibits longitudinally extending ribs and is
The needle-actuating cams are mounted upon the under
substantially as extensible transversely of its width as
or inner sides of the spaced, parallel, longitudinally ex 75 ordinary ribbed fabric, and because of its distinct ribs
Z, and in dotted lines showing the cams as they are
positioned when the cam carrier moves in the opposite
is
4
3,052,108
5
has a surface which is rough to the touch. On the other
hand, the fabric resultant from the manipulation of the
needle beds, in accordance with the present invention is
wholly distinct in appearance and feel from ordinary
ribbed knitting, or from knitted fabric made by the cus
tomary racking operation. The fabric made by the ap
paratus herein disclosed is alike on both sides; its surface
is substantially devoid of longitudinally extending ribs;
the legs of the individual stitches are longer than those
of ordinary one-and-one rib-knitted fabric and extend
diagonally, for example at approximately 45° to the
length of the fabric, and the long legs of the loops, at
opposite sides of the fabric cross each other, giving
6
S1 and S2 in opposite directions, and when the cam carrier
22 moves to the left as viewed in FIG. 5‘, the dog 49
will contact the ?xed stop 5% and thus move the rack in
the other direction and so shift the cams S1 and S2 op
positely.
It will, of course, be understood that the cams I and
I’ which shift the needle beds, are so timed by their
actuating mechanism, that the needle beds are only shifted
after the cam carrier 22 has reached the end of its stroke
in one direction or the other and while the cams, mounted
on the plate 33, are disengaged from the needle butts.
Let it be assumed, for example, the the cam carrier
22 has moved to the right from the position of FIG. 5
until the ?nger 49a has contacted the stop 51. Then the
a lacy appearance to the material. More important, from
the standpoint of the present invention and the desired 15 relative positions of the stitch cams S1 and S2 would be
that shown in full lines in FIG. 6, and the cam carrier
utility of the fabric, is the fact that the fabric is sub
would then be ready to move in the direction of the
stantially as extensible longitudinally as it is transversely
arrow Z, the stitch cam S2 now being in the operative
and, in fact, by suitably adjusting the tension imposed
position while the stitch ‘cam S1 is in the inoperative posi
during knitting, it may be made to be substantially greater
tion. During this stroke the cam P will raise the needles
in longitudinal extensibility than transversely.
to slip their old loops below their latches and to take
As a result of the simultaneous racking of the needle
a new yarn in their hooks, and the stitch cam S2 will then
beds in opposite directions, the knitted loops are neces
sarily extended diagonally as will be appreciated from
comparison of FIGS. 2 and 3, so that whereas a loop
which extends from needle A to needle ‘II, as the beds
are shown in FIG. 2, is relatively short in length, a loop
extending from needle A to needle II as the beds are
move the needles down to draw the new stitches and cast
off the old loops. However, as the cam carrier moves
in this direction, the butts of the needles which are carry
ing the yarn received during the next preceding course
will not be drawn downwardly so far by the cam S1 that
the yarn will be subjected to undue tension such as might
result were the idle cam S1 in position to draw down
idle stitch cam be shifted so as to avoid putting undue 30 the needle butts.
While herein one desirable means for shifting the stitch
strain on the yarn as the cam carrier travels along the
cams S1 and S2 has been illustrated by way of example,
row of needles. To accomplish this result, in accordance
it is to be understood that other and equivalent means
with the present invention, the stitch cams are mounted
may
be employed, and that any such means for attaining
upon the cam carrier for movement toward and from
the desired result which falls within the scope of the
operative position, with means for automatically shifting
shown in FIG. 3 is much longer. In experimental work
in devising this material, it was found essential that the
them just prior to the beginning of each knitting course.
Thus, as shown in FIGS. 5 to 9 inclusive, the cam car
rier 22, whose parallel bars or rails 22a and 22b respec
tively, are provided with like sets of knitting cams (only
one set of which is here illustrated), are enlarged in width
at their central portions 31 and 32 respectively, and upon
the inner face of each of these enlarged portions there
is ?xed a cam-supporting plate 33 (FIG. 7) having pairs
appended claims, is to be regarded as within the purview
of the invention, and likewise, as above noted, the means
illustrated in FIG. 4, for shifting the needle beds alterna
tively in opposite directions, is merely suggestive. Ob
viously, each individual needle bed might be shifted
by hand in accordance with such a sequence of opera
of parallel, inclined slots 34, 34 and 35, 35, respectively,
tions as above described, or each individual bed might
be shifted mechanically, for instance, by such means as
is shown in the patent to Rist et al., No. 248,795, October
spective stitch cam S1 or S2.
end of each operative stroke.
for guiding the two stitch cams S1 and S2 respectively 45 25, 1881, which provides for racking a single needle bed
one needle space and then back again, but it will, of
of the set, in moving toward and from operative posi
course, be understood that, in accordance with the pres
tion. This plate 33 is provided with two bearing open
ent invention, whatever means might be employed for
ings in which rotary crank discs 36 (FIGS. 7 and 9) are
moving the beds would vbe arranged to move the respec
arranged to turn, each disc having a crank pin 37 which
tive beds oppositely while the cam carrier dwells at the
is received in a horizontal slot 38 (FIG. 6‘) in the re
The cams are held, for
movement, against the inner face of the plate 33 by
headed studs 39 (FIG. 6), which slide in the slots 34
I claim:
1. In a straight-bed knitting machine for knitting fabric
which is at least as extensible longitudinally as trans
.and 3-5 of the plate 3-3. Each disc 36 is ?xed to a shaft
40 (FIG. 9) which turns in a bearing sleeve 41 secured 55 versely of its width, said machine being of the kind where
in a frame supports bearings for a drive shaft and for two
to the outer side of the enlargement 32 of the corre
opposed needle beds, each having parallel needle grooves,
sponding bar or rail 22a or 2211 respectively of the cam
a hooked needle having an actuating butt in each groove,
carriage 22, each shaft 40 having a pinion 42 located
means for delivering yarn into the needle hooks, and
at the outer side of the respective cam carrier part, the
60 knitting cams for actuating the needles to knit compris
pinions being secured to their shafts by nuts 43.
ring a cam carrier and means for reciprocating it longi
The pinions 42, at the front of the machine, for ex
ample, engage an elongate rack member 44 (FIG. 5),
attached at its opposite ends to slidab-le rods 45 and 46
tudinally of the needle beds, in combination, means
guiding both needle beds to slide longitudinally, relatively
respectively, which slide in bearing members 47 and 48
to the frame and to each other, and racking means,
?xed to the outer surface of the front rail 22b, it being 65 actuated by the drive shaft, which is operative to move
.understood that a similar arrangement is provided upon
‘both beds simultaneously, but in opposite directions re
the rear cam carrier rail, 22a. Downwardly depending
spectively, after each course of needle loops has been
dogs 49 and 49a are ?xed to the remote ends of the rods
45 and 46 respectively and are so arranged, relative to
knitted and while the knitting cams are out of operative
with the needle butts.
?xed stop members or abutments 5t)‘ and 51, carried by 70 engagement
2. The combination according to claim 1, wherein for
the machine frame, that as the cam carrier moves in
moving the needle beds in opposite directions, there is
one direction (to the right as viewed in FIG. 5) the dog
provided cam means, moving in timed relation to the
49a will engage the stop 51 and thus move the rack 44
drive shaft of the machine, said cam means being so
and so turn the pinions 42 as to rotate the discs 36, where
by the cranks 37 are so turned as to move the stitch cams 75 devised as to move each needle bed a distance equal to
3,052, 108
7
the spacing between adjacent needles prior to the be
respective needle bed, each bar having a cam-supporting
plate at its inner side, each respective plate having a
pair of parallel, inclined slots, and each stitch cam hav
ing studs which slide in the slots of a pair thereby to guide
ginning of the knitting of each successive course.
3. The combination according to claim 1, further char
acterized in that the racking means for moving the needle
beds is operative to move each bed one needle space in
one direction and one needle space in the opposite direc
each cam for movement from an operative to an inopera
tive position relatively to the needles, actuating means
mounted upon each respective bar of the cam carrier for
tion, alternately.
4. The combination according to claim 1, further char
moving the cams of the corresponding pair in opposite
directions, and means for operating said actuating means,
and arranged as to avoid the application of breaking stress 10 as the cam ‘carrier nears the end of its stroke, in opposite
to the yarn as a result of the opposite racking motion
directions respectively.
acterized in that the knitting cams are so constructed
of the needle beds.
5. The combination according to claim 1, wherein the
12. The combination according to claim 10, wherein the
actuating means for shifting the stitch cams of a pair
cam carrier supports a pair of stitch cams for coopera
from operative to inoperative position, and vice versa,
tion with the needles of each respective bed, the two 15 comprises a rotary crank having a pin engaging a hori
stitch cams of each pair being movable from operative to
zontal slot in each stitch cam of a pair, a rotary shaft
inoperative position, and means operative automatically,
to which each crank is ?xed, each such shaft extending
as the cam carrier nears the end of its stroke in one
to the exterior of the corresponding bar of the cam car
direction, to shift to inoperative position the cam which
rier, a pinion ?xed to each shaft, an elongate rack en
will be the forward cam during the following stroke of the 20 gaging both pinions of a pair, and means operative to
cam carrier and simultaneously to shift to operative posi
move the rack longitudinally and thereby simultaneously
tion the stitch cam which was the forward cam during
to turn the two pinions when the cam carrier nears the
the stroke of the cam carrier just being completed.
end of its stroke in each direction respectively, the two
‘6. The combination according to claim 1, further char
cranks being so arranged that, in turning in the same
acterized in that the knitting cams include spaced stitch 25 direction, they move the stitch cams of a pair in op
posite directions.
cams mounted upon the cam carrier, which are operative,
respectively, by engagement with the needle butts, to draw
13. That ‘method of knitting a fabric which is alike on
stitches as the carriage moves alternately in opposite
both sides and which is at least as stretchable longitudi
directions, means operative automatically so to position
nally as it is transversely of its width which comprises
that stitch cam which is foremost in a given direction 30 as steps: providing two parallel rows of hooked knitting
of movement of the carriage, that it cannot actuate the
needles, the needles being uniformly spaced ‘apart to the
needles to impart injurious tension to the yarn.
same amount in both rows and with the needles in one
7. The combination according to claim 6, wherein, for
row initially disposed approximately opposite the mid
positioning the forward stitch cam, so that it will not
point between adjacent needles of the opposite row, lay
eliectively move the needles, each stitch cam is movably 35 ing a yarn into the hooks of all of the needles of both
mounted on the 0am carrier, means, comprising a pinion,
rows, relatively moving the yarn and the needles so as
for moving each respective cam, and a rack bar engaging
to form a loop of yarn upon each needle, bodily moving
both pinions and Which, by relative motion of the rack
each row of needles longitudinally a distance equal to
bar and cam carrier, rotates the pinions thereby to move
one needle space, the two rows being moved oppositely,
40
both cams simultaneously.
again laying the yarn into the hooks of all of the needles,
8. The combination according to claim 7, wherein for
and so relatively moving the yarn and the needles as to
moving the rack bar there is provided a dog ?xed rela
cast off the previous loops over the newly formed loops
tively to the rack bar and a ?xed stop engageable by
of yarn upon the needles so as to form stitches, then
said dog as the cam carrier nears the end of its stroke
moving the two rows of needles back to their original
‘in one direction.
9. The combination according to claim 7, wherein for
moving the rack bar there are provided dogs ?xed relatilve
ly to the rack bar and located near opposite ends, respec
45
positions, and repeating the above steps cycle-after-cycle
in the formation of knitted material.
14. The method according to claim 13, wherein the
needles are latch needles and each is movable longitudi
tively, of the cam carrier, and spaced stops engageable by
na'lly in the taking of the yarn in its hook and casting
the respective dogs as the cam carrier nears the end 50 off of a stitch, and, in the formation of each row of
of its stroke in opposite directions.
10. In combination a straight-bed knitting machine
having two needle beds, each furnished with knitting
needles, means supporting and guiding both needle beds
beginning at one end of the row and advancing toward
to slide longitudinally, a cam carrier movable longi
needle, prior to its elevation to receive a new yarn in
stitches, progressively actuating the needles of each row,
the opposite end, to form a course of stitches and, in so
actuating the needles, avoiding the downdrawing of any
tudinally of said beds, a pair of stitch cams cooperable
its hook, until said course has been completed thereby
to avoid the application of breaking stress to the yarn.
with the needles in each respective bed, the cams of each
pair being movably mounted upon the cam carrier, means
References Cited in the ?le of this patent
operative simultaneously to move the needle beds in 60
opposite directions while the stitch cams are disengaged
UNITED STATES PATENTS
from the needles, and means operative to shift the stitch
cams, after the formation of each knitted course, so that
the stitch cam, which will be idle during the formation of
the next course, is disposed in inoperative position.
11. The combination according to claim 10, wherein
the cam carrier comprises an elongate bar overlying each
232,834
244,079
265,359’
670,159
838,065
1,072,856
Marshall ______________ __ Oct. 5,
Rist _________________ __ July 12,
Angst ________________ __ Oct. 3,
Millholand et a1. ______ __ Mar. 19,
Whitcomb ___________ __ Dec. 11,
1880
1881
1882
1901
1906
Kellner et al. __ _____ _,___ Sept. 9, 1913
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