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Патент USA US3077106

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Feb. 12, 1963
V.
H . BUTLER
YARN HANDLING AND SEVERING MECHANISM FOR
CIRCULAR KNITTING MACHINES AND METHODS
Filed April 2, 1957
3,077,097
6 Sheets-Sheet 1
F162].
INVENTOR
VAUGHN H. BUTLER
ATTORNEY
Feb. 12, 1963
YARN HAND
CIRCULAR
Filed April 2, 1957
v. ND
H. SEVERI
BUTLERMECHANISM FOR 3,077,097
ms MACHI
AND METHOD
6
eats-Sheet 2
F166’.
INVENTOR
VAUGHN H. BUT LER
BMW
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ATTORNEYS‘
Feb. 12, 1963
v. H. BUTLER
YARN HANDLING AND SEVERING MECHANISM FOR
Filed April 2, 1957
3,077,097
CIRCULAR KNITTING MACHINES AND METHODS
6 Sheets-Sheet 3
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VAUGHN H.BUTLEIR
B'YWWWMéIZ
ATTORNEYS
Feb. 12, 1963
v. H. BUTLER
3,077,097
YARN HANDLING AND SEVERING MECHANISM FOR
Filed April 2, 1957 CIRCULAR KNITTING MACHINES AND METHODS
6 Sheets—Sheet 4
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INVENTOR
VAU GH N H. BUTLER
‘’ ATTORNEYS
Feb. 12, 1963
v. H. BUTLER
3,077,097
YARN HANDLING AND SEVERING MECHANISM FOR
CIRCULAR KNITTING MACHINES AND METHODS
Filed April 2, 1957
6 Sheets-Sheet 5
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ATTORNEYS
Feb. 12, 1963
v. H. BUTLER
3,077,097
YARN HANDLING AND SEVERING MECHANISM FOR
CIRCULAR KNITTING MACHINES AND METHOD
Filed April 2, 1957
6
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INVENTOR
VAUGHN H. BUTLER
ATTORNEYS
rates Patent Office
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3,077,097
Patented Feb. 12, 1963
2
FIGURE 5 is a side elevational view of the mechanism
s 017 097
of FIGURE 3, looking toward the bottom of FIGURE 3;
FIGURE 6 is a bottom plan view of the mechanism of
FIGURE 3 ;
FIGURE 7 is a sectional view taken on the line 7-—7
YARN HANDLING Ann énvanmo MncnANrsM
son CIRCULAR KNITTING MACHINES AND
METHODS‘)
Vaughn E. Butler, Harriman, Tenn, assignor, by mesne
assignments, to The Gordon Company, Winston-Salem,
of FIGURE 3;
NC, a partnership
FIGURE 8 is a sectional view taken on the line 8-8
Filed Apr. 2, 1957, Ser. No. 650,212
21 Claims. (Cl. 66—140)
of FIGURE 3;
FIGURE 9 is a sectional view taken on the line 9-—9
of FIGURE 3;
This invention relates to circular knitting machines, and 10
FIGURE 10 is a side elevational view of the dial cap
in particular to improved means and methods for han
dling and severing yarns on the dial caps thereof.
In the knitting of tubular articles such as seamless
of FIGURE 1 and elements mounted thereon, ‘looking
toward the shear;
FIGURE 11 is a
hosiery, frequent yarn changes are commonly effected in 15 mounted shear;
the course of the knitting cycle. In the case of hosiery,
perspective view of the dial cap
FIGURE 12 is a plan view of the shear;
for example, the welt and leg may be knitted of different
FIGURE 13 is a plan view of the cutaway dial cap
yarns, and heavier yarns are frequently employed in the
plate which accommodates the shear;
_
I
heel and toe. At each yarn change, an inactive yarn is
FIGURE 14 is a leading end elevational view of the
dropped into the needles for knitting and an active yarn 20
shear,showing the rounded outside surface: of the mov
is withdrawn from the knitting a few needles later. Two
able shear blade;
yarn ends extend from the resulting yarn lap, and these
FIGURE 15 is a sectional view taken on the line 15
are commonly severed so as to be an inch or two in length.
15 of FIGURE 11;
Since yarn ends of such length are easily noticeable and
FIGURES 16 through 21 are plan views sequentially
unsightly, they must be removed, and this is usually done 25
illustrating the operation of the invention throughout a
individually and manually during inspection. The yarn
yarn change;
ends are clipped down to 1A" or %", which is commer
_
cially satisfactory. The clipping operation is obviously
FIGURE 22 is an elevational view of the pneumatic
yarn changes, with such reliability and control as to
2 illustrate a portion of a conventional seamless hosiery
machine, such as a 400 needle Model KN Scott & Wil
system of the invention;
time consuming and expensive, and exposes the stockings
FIGURE 23 is a side view of an exemplary ring cam
to possibility of damage.
30 actuating the pneumatic system, and
A principal object of the present invention is the pro
FIGURES 24 and 25 illustrate drum earns adapted to
vision of novel means and methods for positioning yarns
e?ect the desired rate of operation of the shear.
over the dial cap of the machine for clipping, and auto
Referring to the drawings in detail, FIGURES 1 and
matically severing the yarns close to the fabric during
eliminate subsequent inspection and clipping of free ends.
liams machine. As shown, the latch ring 30 encloses
the knitting station indicated generally as 32, the latter
Related objects are to provide a novel yarn shear disposed
peripherally of the dial cap and very closely adjacent
being provided with a yarn guide plate 34 and a plu
the needles, and means for positioning the yarn ends to
extend substantially radially inwardly from the needles
as they are severed. The invention contemplates the‘
close clipping of the ends of both newly inserted and with
drawn yarns, preferably with a single shear stroke.
Another object of the invention is to provide novel
40
rality of yarn ?ngers 36 which are individually retract~
able and function as interchangeable yarn feeds. The
yarn ?ngers are pivotally mounted at 38, and actuated
in conventional manner by thrust bars maintained in con
tact with the main pattern drum of the machine. Knit
means and methods for holding and tensioning yarns on 45 ting yarns ‘pass through eyes in the guide plate 34 and
through the ends of the yarn ?ngers 3-6. Illustrated is
the dial cap of the machine. Related objects are the pro
an
inactive yarn 40 controlled by ?nger 36', and an
vision of a suction device and pneumatically operated
active yarn 42 extending from ?nger 36" to the adjacent
clamp, which cooperate to insure that all yarn ends are
knitting needles 44 of the machine. As will be under
under positive control at all times. The yarn handling
mechanism is distinct from the yarn severing mechanism 50 stood, other active and inactive yarns may be present,
but are unnecessary for an understanding of the present
and separately actuated, eliminating “pulled ends” and
invention. The needles 44 are independently mounted‘
undesired disturbance of inactive yarns. The yarn han
dling means, furthermore, is automatically operative to
tighten all yarns at every yarn lap, and is self cleaning.
Further objects will be in part evident and in part pointed
out hereinafter.
The invention and the novel features thereof may best
be‘ made clear from the following description and the
accompanying drawings, in which:
in the rotary cylinder of the machine (notyshown), and
extend thereabove adjacent the periphery of the dial and
On the dial cap, slightly beyond the position of the
yarn ?ngers in the direction of cylinder rotation (counter
FIGURE 1 is a side elevational view, partly broken 60 clockwise in FIGURE 2), is mounted a guide tongue
away, illustrating a preferred embodiment of the inven
tion in operative association with related parts of the
knitting machine;
69. Therebeyond, at a position spaced angularly from
the knitting station 32 by about 90°, the convention-a1
clamp and shear mechanism of the dial cap is replaced
FIGURE 2 is a top plan view of the mechanism of
in accordance with the present invention by a yarn han
FIGURE 1, with some parts removed for the sake of 65 dling mechanism indicated generally at 62. As best illus
clarity;
trated in FIGURES 3 to 9, the yarn handling mechanism
FIGURE 3 is a top plan view of the yarn handling
comprises a ‘block or housing 64, having a bottom sur
face 66 adapted to rest on the dial cap, to which the‘
mechanism of the invention, on enlarged scale;
FIGURE 4 is an end elevational view of the mecha 70 housing is attached as by means of screws ‘68. Aihori
zontal bore 70 extends through the housing 64, and an
nism of FIGURE 3, looking toward the right hand side
air pressure conduit 72 communicates with one end of‘
thereof;
the bore 76’- through the adapter"74, which terminates
3,077,097
3
4
action of spring 150 in contact with a ring cam 152
in a small diameter jet 76. As shown, the adapter 74
mounted on the main drum of the machine. A second
may be welded to the pressure conduit 72, and secured
valve
operating link 154 may be pivotally mounted along
in the housing by screw 78. An exhaust conduit 80
side link 138 to facilitate manual operation of the valve
extends from the other end of bore 70, its end being
132. An exemplary ring cam 152, comprising suitably
suitably retained ‘as by screw 82. As will be understood,
positioned
cutaway sections 156, is illustrated in FIG
the pressure conduit 72, bore 70 and exhaust conduit 80
URE 23.
together constitute a continuous air path or conduit for
Beyond the yarn handling mechanism 62, and angular
air flow. A branch passage 84 extends downwardly from
ly spaced therefrom in the direction of cylinder rotation
the intermediate section of bore 70, to the upwardly
offset undersur-face 86 of the housing. As‘will be evi 10 by approximately 45°, a novel yarn shear 160 is mounted
peripherally on the dial cap. To mount the shear in suit
dent, with the bottom housing surface 66 resting on the
able relationship to the needles, the dial plate 162, com
dial cap, the undersurface 86 will be slightly spaced
prising part of the dial cap 46, is cut away as at 164. A
therefrom. The jet 76 of the adapter 74 is directed to
hollow pivot block 166 is mounted in the cutawayypor
ward the end opening of exhaust conduit 80, these ele
ments being adapted to function as an aspirator, to create 15 tion of the dial plate, by means of the flange 168 which
extends therefrom and is secured to the dial cap as by
suction in and induce air flow upwardly through the
screws 170. Outwardly of the ?ange 168 is provided a
branch passage 84. A guide post 88 extends downwardly
?xed
shear blade 172, the shear blade adjoining very
from the undersurface 86 adjacent branch passage 84,
closely the periphery of the dial plate. A movable shear
the post 88 being adapted to extend into an accommo
20 blade 174 is pivotally mounted on the pivot block 166,
dating socket therefor in the dial cap.
by means of a pivot screw 176 (see FIGURE 15), into
A diagonal slot 92 extends across the top of the hous
which the bolt 178 is threaded. A spring 180‘ extends
ing ‘64, and a pivotal clamp arm 94 is ?tted to operate
between the head of bolt 178 and the opposite interior sur
within the slot, being retained by its pivot pin 96. vOne
face of pivot block 166, and serves to maintain the shear
end of the clamp arm 94 terminates in a yarn clamp
blade
174 in firm pressure contact with the pivot block.
25
98 of conventional design, the yarn clamp being dis
The leading end 182 and the trailing end 184 of the
posed substantially over the guide tongue 60, at a posi
movable shear blade 174 are exteriorly rounded as
tion leading the housing 64 with respect to the direction
shown, for a purpose hereinafter apparent.
of cylinder rotation, as clearly shown in FIGURE 2.
The movable shear blade 174 is engaged by a rod 186
The opposite end of clamp arm 94 is engaged and biased
upwardly by a spring 100, which extends therefrom up 30 to one arm of a lever 188, which is pivotally supported
near its center by the bracket 190. The opposite end
wardly to a clip 102, suitably engaged under the head
of lever 188 is engaged by rod 192 to the operating lever
of the nearest screw 68. The spring 100, it will be under
194 of the machine, which in turn engages and is actuated
stood, constantly urges the associated end of clamp arm
94 upwardly, whereby the clamp 98 is urged downwardly,
by the thrust rod 196 (see FIGURE 1).
A cap 198 ex
lying dial cap.
whereby the cap normally maintains the operating lever
and vnormally maintained in ?rm contact with the under 35 tends from a recess 200 in an underlying portion of the
' In alignment with the slot 92 but offset with respect
to the horizontal bore 70 is a vertical bore 106, which
machine frame, and is urged outwardly by spring 202,
in the position illustrated, in ?rm contact with the thrust
rod 196, and the shear in closed position. The thrust
extends downwardly from the top of the housing 64 to
rod, it will be understood, is elevated at predetermined
a-substantial depth. Fitted in the bore 106 is a piston 40 intervals
by suitable cams on the main drum of the ma
108, the upper surface 110 of which underlies the clamp
chine,
whereby
the operating lever 194 is tilted, and the
arm 94 at a point well spaced from its pivot pin 96. An
lever 188 correspondingly tilted to open the shear. Ex
extension 112 from the piston 108 extends along one
emplary drum cams suitable for such thrust rod actuation
side of, the clamp arm 94, in guiding relation therewith.
are illustrated in FIGURES 24 and 25. For reasons
A transverse horizontal passage 114 extends from imme 45 presently apparent, it is desirable that the closing stroke
diately below the horizontal bore 70 to the bottom of the
of the shear be gradual rather than sudden, and take
vertical bore 106, ‘and the adapter 74 is drilled as at
place over a brief interval of time corresponding to the
116 to provide communication between the interior of
passage of several needles of the machine past a ?xed
the adapter and the horizontal passage 114, and so with
point. The drum earn 210 illustrated in FIGURE 24,
the bottom of the piston 108. The latter is chamfered 50 for example, is provided with a sloping trailing surface
at its bottom, or otherwise formed or disposed, to permit
212, which permits the associated thrust rod 196' to ride
?uid pressure contact therewith effective to elevate the
downwardly from ‘the high surface 214 to the drum sur
piston.
face 216 at a controlled rate. In FIGURE 25, the drum
' As a further novel and important feature of the inven
cam 220 comprises the high surface 222, from which the
ti‘on, a small diameter tube 118 extends from the inte 55 associated thrust rod may descend in stepwise fashion ?rst
rior of adapter 74 across the outside of the housing 64,
to the step surface 224 and then to the drum surface 216.
terminating in a nozzle 120 directed slightly downwardly
As will be understood, stepwise descent of the thrust rod
against the underlying dial cap, and generally in the
similarly effects shear closing at a controlled rate.
direction of cylinder rotation. As shown in FIGURE 2,
Function and operation of the invention will now be
the nozzle 120 is disposed adjacent the periphery of the 60 described. Referring initially to FIGURE 1, it may be
dial cap, and accordingly near the encircling needles 44
assumed that the machine is operating in normal round
of the machine.
‘
and-round knitting, as would be the case in knitting a
The pneumatic system, by which pressure air is sup
stocking
welt. The yarn ?nger 36" is illustrated in active
plied to pressure conduit 72 at predetermined portions
of the knitting machine cycle, is illustrated in FIGURE 65 position, feeding yarn 42 directly into the needles 44 for
knitting. The yarn ?nger 36’, in common with the other
22. As there shown, a pressure air line 130 leads to an
yarn ?ngers, is up in inactive position, and the inactive
air valve 132 suitably mounted on the machine. The
yarn 40 extends therefrom under guide tongue 60 and
valve outlet discharges into a small reservoir 134, which
yarn clamp 98, into the open bottom end of branch pas
in turn communicates with a pressure line such as ?ex
ible hose 136 connected to the pressure conduit 72 of 70 sage 84 of the yarn handling mechanism 62, and into the
exhaust conduit 80 thereof.
the yarn handling mechanism 62. An actuating link 138
The thrust rod 196 and operating lever 194 are in the
is'pivotally mounted at 140, and disposed adjacent and
position illustrated in FIGURE 1, whereby the shear 160
in alignment with the valve stem 142 of the valve 132.
is in normally closed position. Referring to FIGURE
The outer end of link 138 is connected by rod 144 to a
bell crank 146, pivoted at 148 and maintained by the 75 22, while straight knitting of the yarn 42 proceeds,
5
3,077,097
the bell crank 146 rides a high portion of the ring cam
152, thereby disposing the actuating link 138 in the posi
tion illustrated, out of contact with the stem 142 of valve
132, whereby the valve is in normally closed position.
This represents the relationship of the parts while straight
knitting proceeds.
When the machine comes to a yarn change, the yarn
?nger 36” is dropped to active position, by a jog of the
main drum, and the hitherto inactive yarn 40 passes be
tween the needles 44 and is taken thereby. Substantially
simultaneously, the bell crank 146 (FIGURE 22) is per
6
needles, the previously active yarn 42 is withdrawn there
from, by elevation of its yarn ?nger 36". Normally, the
previously active yarn is withdrawn 110 or 15 needles after
the hitherto inactive yarn is inserted, providing a yarn lap
of about 1/2 inch. FIGURE 17 illustrates the relationship
of the various elements very shortly after the ?nger 36"
has been elevated. 44-” represents the last needle to take
the yarn 42 for knitting. As illustrated in FIGURE 17,
the newly withdrawn yarn 42 extends from the needle 44"
to the yarn ?nger 36". The ?rst needle 44' to take and
knit the yarn 40 has advanced in clockwise direction to
mitted to drop into a low section 156 of the ring cam 152.
the position illustrated, the needle having withdrawn this
The spring 15!‘) rotates the bell crank the permitted dis
yarn from under the guide tongue 60. The needle 44'
tance, and through rod 144 rotates the actuating link 138
into contact with stem 142 of valve 132., and displaces the 15 has advanced more closelyto the yarn handling mecha
nism, and the suction eifect of the latter functions to take
valve stem inwardly to open the air valve. High pres~
up
the slack in the free end of yarn 4t), and maintain
sure air immediately ?ows into reservoir E34 and through
proper tension thereon.
?exible hose 136 into the pressure conduit 72 of the yarn
it will be noted that while the newly inserted yarn 4%}
handling mechanism 62. The high pressure air ?ow
enters the horizontal bore 74‘) of the housing 64 through 20 is withdrawn by the needles at this stage from under the
guide tongue ‘60, there is no necessity to pull the yarn out
jet 76, and then passes through the exhaust conduit 80.
As will be understood, the high velocity ?ow through
the central section of the horizonal bore 70 effects an
aspirating action, creating a suction in the branch passage
84 and causing air ?ow into the open bottom end there
against clamp pressure, the pneumatic clamp 98 having
been automatically elevated. The newly inserted yarn,
accordingly, is not tightened up by clamp pressure, and
heavy places or “pulled ends” in the fabric are effectively
25 avoided. While the clamp pressure is relieved before the
of.
newly inserted yarn is pulled out from under the guide
The free end of the hitherto inactive yarn 4b is en
tongue, remaining inactive yarns are effectively held and
gaged by this air ?ow into the branch passage 84, and by
tensioned by suction etfect,‘whereby they are prevented
the high velocity ?ow into the exhaust conduit 89', and
thereby drawn taut against the restraining in?uence of 30 from being pulled out with the newly inserted yarn. As
will be recognized, this too constitutes an outstanding
guide tongue 69, yarn ?nger 36’, guide plate 34 and the
improvement
in operation.
conventional yarn tensioning and feeding elements of the
The next sequential step in the operation is illustrated
machine.
in FIGURE 18, wherein the ?rst needle 44' to knit the
Simultaneously, the high pressure air in pressure con
yarn as has reached a position opposite the yarn handling
duit 72 and adapter 74 passes through drill 116 and
transverse passage 114 of the housing 64, and forces the 35 mechanism. Further slack in the free yarn end has been
'aken up in the branch passage 84 and the exhaust conduit‘
piston 103 upwardly. The piston overcomes the counter
so of the yarn handling mechanism, while effective ten
balancing force of spring 180, and elevates the engaged
sion is maintained on this yarn. Meanwhile, yarn 42 has
end of the clamp arm 94, and the yarn clamp 98. The
clamp arm 94 and the slot 92 are designed, desirably, to 40 been carried by the last needle 44" to knit this yarn‘
partly around the dial cap, and the yarn end extending
limit upward movement of the yarn clamp 98 by engage
from needle 44" to the ?nger 36” has been drawn under
ment of the clamp arm 94, near its engagement to the
the guide tongue 69.
spring Hill, against the bottom of slot §2, whereby the
FIGURE 19 illustrates the relationship of the elements
clamp arm effectively retains the piston in its bore 1%.
Access of pressure air to the yarn handling mechanism, 45 when the‘ ?rst needle 44’ to take the yarn 46 has advanced
to a position corresponding to or radially aligned with a
then, elfects release of clamp pressure on the inactive yarn,
point well into the V formed by the blades of the now
but the inactive yarn is simultaneously engaged and ten
open shear. As the needle 44' advances from the position
sioned by the air movement described above. At the
of
FlGURE 18 to that of FIGURE 19,‘ the free end of
same time, also, pressure air passes from the adapter 74
through the tube 118 and its nozzle 129, for a purpose 50 yarn 4%} must be extended with respect to the branch pas—
sage 34 of the yarn handling mechanism, and is permitted
presently apparent.
to pull out under suitable restraining tension, by the nature
The same jog of the main drum which drops‘ the yarn
of the engagement thereof. At this point also, the yarn
?nger 35' to active position and opens the air valve 132
bight extending from needle 44’ to the branch passage 84
may be utilized to open the shear rsa For this purpose,
is‘engaged by the air blast issuing from the nozzle 120
a cam 210' as illustrated in FIGURE 24 or a cam 22E}
55 of tube 118. This air blast sweeps across the peripheral
as illustrated in FIGURE 25 may ride under and elevate
portion of the dial cap in the vicinity of the shear, and in
the thrust rod 1%, to rotate the operating lever 194 in‘
the direction of needle rotation, and is effective to be'ly
clockwise direction as viewed, moving cap 1% into recess
out the yarn end so that it ‘extends substantially radially
20%, and compressing the spring 2&2. This movement of
the operating lever the depresses the engaged rod 193., and 60 inwardly from the needle 44'. That is, the blast effect of
the nozzle 126 is balanced by the restraining suction e?iect
rotates the lever 18% to elevate the rod 186 and lift the
of the yarn handling mechanism on the engaged yarn end,
movable shear blade 174 to open position, illustrated in
with the net result that the yarn assumes the relative
FIGURE 11 and in dotted lines in FIGURE 10.
position illustrated in FIGURE 19.
FIGURE 16 illustrates the relationship of the mecha
It will be understood that if the yarn extends-Yin a
nism immediately after the ?nger 36’ has dropped to active
position. Finger 36" remains in active position, feeding 65 straight line from branch passage 84 to the needle 44',
it will be disposed across the shear blades at an acute
yarn 42 into the needles, and the hitherto inactive yarn
angle. Under these circumstances, even though the
4%} has just been engaged by the needles for knitting. The
shear blades are disposed closely adjacent the needles,‘
needle 44' is the ?rst needle to take the yarn 4t}, and
on severing the yarn a cut end‘ is left which is consider
accordingly will be the ?rst needle to knit this yarn. The
yarn clamp Q3 is as previously stated in elevated position, 70 ably greater in length than the radial distance from the
shear to the needles, due to the inclination of the yarn.
and the free end of yarn 40 extends into the exhaust
The
e?ect of the air blast on the yarn, then, is to posi-l
.
conduit 86 of the yarn handling mechanism, under the
tlon
it for cutting in such manner that the cut end re?
control and tensioning effect of air movement.
Momentarily after the yarn 45}: is dropped into the 75 maining on the fabric is of absolute minimum length.
The withdrawn yarn 42, at the sequential point illus
‘8,077,097
8
trated in FIGURE 19, has passed well under the guide
tongue 60 (the yarn clamp 98 being still elevated), and
has been carried under the undersurface 86 of the yarn
handling mechanism, and into contact with the guide
post 88. The upward ?uid flow into branch passage 84
has engaged the yarn extending thereunder, drawing a
loop of the yarn up into the branch passage and exert
(FIGURE 22) to ride up out of the engaged cutaway
section 156 and onto the high surface of the ring cam
152. The bell crank 146 is by this movement pivoted to
the position illustrated in FIGURE 22, against the action
of spring 150, displacing the rod 144 and actuating link
138 and permitting the valve stem 142 of valve 132 to
move outwardly, whereby the valve is closed. The reser
voir 134, however, is effective to maintain pressure air
ing tension effect thereon. Beyond the branch passage
?ow for a brief interval of time after closing of the
84, the yarn end extending to the needle 44’ has en
countered the blast of nozzle 120, and is bellied out in 10 valve 132, adequate to remove the severed end of yarn
40 and to engage the free end of the withdrawn yarn 42
the manner of the yarn 40.
in the yarn handling mechanism.
Since the needles 44’ and 44" may be 1/2 inch or more
apart, the di?‘iculty of shearing both yarns 40 and 42
at the same moment of time will be apparent. The size
of the shear blades having a practical limit, the yarn 42
The air pressure in the adapter 74 and jet 76 drops
gradually, permitting the spring 100 to overbalance the
elevating pressure effect on piston 108, and to close
the clamp Q8. As the suction engagement of the inactive
may not be positioned for shearing when the yarn 44
yarns becomes less effective, then, the yarn clamp comes
reaches the last possible position for shearing. For this
into operation and mechanically engages and holds the
reason, means are provided to close the shear gradually.
inactive yarns. The combined mechanical and suction
Referring to FIGURES 1 and 24, the shear is open as
the thrust rod 196 rides the high surface 214 of the 20 engagement of the yarns is particularly effective, in that
all yarns are engaged at all times, either by mechanical
drum cam 210. At the sequential point illustrated in
clamping or by air movement. That is, the clamp posi
FIGURE 19, a jog of the main drum rotates cam 210
tively grips the inactive yarns at all times except when
to permit" the thrust rod 196 to ride down the sloping
the air is on, and air movement positively engages and
trailing surface 212 of the cam. This results in a rela
controls the yarns when the clamp is elevated. The clamp
25
tively gradual closing of the shear, under the impetus of
is effective, it will be understood, to keep the inactive
spring 202, whereby the movable blade 174 pivots over
yarns in place when the machine head is lifted, when
an appreciable period of time corresponding to the pas
a bobbin is changed, when the machine is racked with
sage of several needles. The shear closing is timed to
the head up, and at other times. Another advantage in
initiate shearing at the point illustrated in FIGURE 19,
whereby the free end of newly inserted yarn 40 is sheared 30 herent in operation of the yarn handling mechanism is
that all yarns are automatically tightened at every yarn
off at this point, leaving a cut end on the fabric of 1%:
lap.
In conventional machines, if a yarn becomes slack
inch or less in length. The severed yarn end is ex
between its yarn ?nger and the yarn clamp, it stays slack
hausted through the exhaust conduit 80, and may be
until inserted, and on attempted insertion may miss the
caught in a screen receptacle 230 (FIGURE 22) or the
like. Gradual closing of the shear may be attained also 35 needles and miss the lap, resulting in a ruined stocking.
by means of the stepped cam 220 illustrated in FIG
URE 25. As will be understood, movement of the main
drum permits the thrust rod 196 to ride down ?rst to
the step surface 224, and momentarily later to the drum
surface 216.
.
Momentarily later, the withdrawn yarn 40 is carried
by the needle 44" to the position illustrated in FIGURE
Also, the yarn handling mechanism by reason of the pre
viously described air movement is self-cleaning. The
clamp 98, it has been found, may operate for extended
periods of time without attention, whereas yarn clamps
40 3n conventional machines must be cleaned several times
aily.
It will thus be seen that there has been provided by this
invention
apparatus and methods in which the various
20, at which time it is well in between the shear blades
objects
hereinbefore
set forth, together with many practi
and is severed. The action of the air blast from nozzle
cal advantages, are successfully achieved. As various
120, together with the suction engagement and tension 45 possible
embodiments may be made of the several features
ing of the yarn by the branch passage 34, position the
of
the
above
invention, all without departing from the
yarn in the manner already described, whereby the cut
scope thereof, it is to be understood that all matter here
end remaining on the fabric is of minimum length. The
inbefore set forth or shown in the accompanying draw
relatively slow action of the shear insures that the with
ings
is to be interpreted as illustrative, and not in a limit
50
drawn yarn is well between the blades thereof when sev
cred.
In this manner, both yarns are cut by a single
mg sense.
I claim:
1. In a circular knitting machine having a rotary cyl
inder with independent needles, a dial cap mounted ad
jacent the top of said cylinder, a group of individually
ends 182 and 184 of the movable shear blade 174 per
retractable interchangeable yarn feeds, and yarn severing
mit the shear to be mounted very closely to the needles,
means
disposed peripherally of said dial cap at a point
further minimizing the length of the cut ends remaining
angularly spaced from said yarn feed group in the direc
on the fabric.
'
tion of cylinder rotation, a nozzle disposed above said
' When the withdrawn yarn 42 is severed, the end there
of extending from its ?nger 36" is sucked up through 60 dial cap at a point leading said yarn severing means and
being directed in the direction of cylinder rotation, and
the branch passage 84 and into the exhaust conduit 80,
means for causing fluid to discharge through said nozzle
where it remains suitably tensioned- and engaged by air
and across the dial cap during operation of said yarn
movement. This marks the completion of the yarn
severing
means, whereby yarns extending from said
change, and as illustrated in FIGURE 21, the yarn 40
is feeding into the needles for knitting, and the now in 65 needles adjacent said severing means will be bellied out
to extend substantially radially inwardly therefrom.
active yarn 42 is engaged by the yarn handling mecha—
2. In a circular knitting machine having a rotary cyl
nism, together with other inactive yarns, in readiness for
inder
with independent needles, a dial cap mounted ad
reinsertion. Thus, at the completion of the yarn change,
jacent the top of said cylinder, a group of individually
the end of the withdrawn yarn assumes the position
formerly held by the newly inserted yarn, prior to the 70 retractable interchangeable yarn feeds, and yarn sever
ing means disposed peripherally of said dial cap at a
yarn change. As will be evident, the operation of the
shear stroke, although at slightly different times and at
slightly spaced points along the shear blades. It is note
worthy that the outwardly rounded leading and trailing
point angularly spaced from said yarn feed group in the
direction of cylinder rotation, a conduit having an open
end
disposed above said dial cap at a point trailing said
. The same jog of the main drum which etfects closing
of the shear may be utilized to cause the bell crank 146 75 yarn feed group and leading said yarn severing means in
device is not limited to two yarns, but three or four or
more yarns maybe handledwith equal facility.
3,077,097;
the direction of cylinder rotation, means for inducing air
?ow into said open end, a nozzle disposed above said
dial cap at a point trailing said open end and leading
said yarn severing means and being directed in the direc
tion of cylinder rotation, and means for causing air ?ow
through said nozzle.
3. In a circular knitting machine having a rotary cyl
1d
downwardly into contact with said dial cap, a vertical bore
in said housing, a piston in said vertical bore, said
piston engaging said clamp whereby upward movement
of said piston will elevate said clamp, and a passage in
said housing providing communication between said pres
sure conduit and the bottom of said vertical bore.
7. In a circular knitting machine, a dial cap and a
inder with independent needles, a dial cap mounted ad
yarn handling device mounted above said dial cap, said
jacent the top of said cylinder, a group of individually
yarn handling device including a housing, a horizontal
retractable interchangeable yarn feeds, and yarn sever 10 bore extending through said housing, a pressure conduit
ing means disposed peripherally of said dial cap at a
communicating with one end of said bore, an exhaust con
point angularly spaced from said yarn feed group in the
duit communicating with the other end of said bore, said
direction of cylinder rotation, yarn handling means com
pressure conduit ‘terminating in a jet directed toward said
prising a conduit having a branch opening above said
exhaust conduit, a branch passage extending downwardly
dial cap at a point trailing said yarn feed group and lead 15 from an intermediate section of said bore and opening
ing said yarn severing means in the direction of cylinder
above said dial cap, a yarn guide post extending down
rotation, a jet in said conduit terminating adjacent the
wardly from said housing to said dial cap adjacent said
juncture of said branch, means for causing pressure air
branch passage opening, a yarn clamp pivotally mounted
?ow through said conduit and jet to induce air ?ow into
on said housing for vertical movement, resilient means
the open end of said branch, and a nozzle disposed above 20 urging said clamp downwardly into contact with said
said dial cap at a point trailing said branch opening and
dial cap, a vertical bore in said housing, a piston in said
leading said yarn severing means and being directed in
vertical bore, said piston engaging ‘said clamp whereby
the direction of cylinder rotation, said nozzle communi
upward movement of said piston will elevate said clamp,
cating with said conduit.
and a passage in said housing providing communication
4. In a circular knitting machine having a rotary cyl 25 between said pressure conduit and the bottom of said
inder with independent needles, a dial cap mounted ad
vertical bore.
jacent the top of said cylinder, a group or’ individually
8. In a circular knitting machine having a rotary cylin
retractable interchangeable yarn feeds, and yarn severing
der with independent needles, a dial cap mounted adja~
means disposed peripherally of said dial cap at a point
cent the top of said cylinder, a group of individually re
angularly spaced from said yarn feed group in the direc 30 tractable interchangeable yarn feeds, and a timing drum
tion of cylinder rotation, a conduit having an open end
controlling the movement of said yarn feeds, a shear dis
disposed above said dial cap at a point trailing said yarn
posed peripherally of said dial cap at a point angularly
feed group and leading said yarn severing means in the
spaced from said yarn feed group in the direction of
direction of cylinder rotation, means for inducing air flow
cylinder rotation, eans actuated by said drum for op-‘
into said open end, a yarn clamp mounted above said
erating said shear, a nozzle disposed above said dial cap
dial cap between said yarn feed group and said open end,
at a point leading said shear and being directed in the
means resiliently urging said clamp into contact with said
direction of cylinder rotation, and means for causing
dial cap, pneumatic means for lifting said clamp away
?uid to discharge through said nozzle and across the dial
from said dial cap, a nozzle disposed above said dial cap
cap during operation of said shear, whereby yarns ex
at a point trailing said open end and leading said yarn 40 tending from said needles adjacent the shear will be
severing means and being directed in the direction of
bellied out to extend substantially radially inwardly there
cylinder rotation, and means for causing air ?ow through
from.
said nozzle.
9. A circular knitting machine as de?ned in claim 8,
5. In a circular knitting machine having a rotary cylin
wherein said shear includes a ?xed blade set low in said
der with independent needles, a dial cap mounted adjacent 45 dial cap adjacent the periphery thereof, and a movable
the top of said cylinder, a group of individually retract
blade pivotal on a horizontal axis positioned outwardly
able interchangeable yarn feeds, and yarn severing
of said ?xed blade, the leading and trailing ends of said
means disposed peripherally of said dial cap at a point
movable
blade being outwardly rounded to clear said
angularly spaced from said yarn feed group in the di
needles.
rection of cylinder rotation, yarn handling means com 50
10. A circular knitting machine as de?ned in claim 8,
prising a conduit having a branch opening above said
wherein said means for operating said shear includes a
dial cap at a point trailing said yarn feed group and
drum cam shaped to close said shear over a discrete pe
leading said yarn severing means in the direction of cylin
riod of time corresponding to the passage of several
der rotation, a jet in said conduit terminating adjacent the
needles to thereby sever a plurality of yarns in a single
juncture of said branch, means for causing pressure air 55 stroke.
flow through said conduit and jet to induce air flow into
11. In the operation of a circular knitting machine
the open end of said branch, a yarn clamp mounted above
having a rotary cylinder with independent needles, a dial
said dial cap between said yarn feed group and said open
cap mounted adjacent the top of said cylinder, 21 group of
end, means resiliently urging said clamp into contact with
individually
retractable interchangeable yarn feeds, and
said dial cap, pneumatic means communicating with said 60 yarn severing means disposed peripherally of said dial
conduit for liftin‘7 said clamp away from said dial cap,
cap at a point angularly spaced from said yarn feed group
and a nozzle disposed above said dial cap at a point trail
in the direction of cylinder rotation, the method comprise
ing said branch opening and leading said yarn severing
ing the steps of applying tension to a yarn end being
means and being directed in the direction of cylinder rota
carried by said needles over said dial cap, directing an
tion, said nozzle communicating with said conduit.
air blast at said yarn end between the point of tension ap—
6. In a circular knitting machine, a dial cap and a
plication and said yarn severing means as said yarn end
yarn handling device mounted above said dial cap, said
moves into proximity to said yarn severing means, said
yarn handling device including a housing, a horizontal
air blast being directed across the dial cap in the direc
bore extending through said housing, a pressure conduit
tion of cylinder rotation whereby said yarn end is bellied
communicating with one end of said bore, an exhaust
out to extend substantially radially inwardly from said
conduit communicating with the other end of said bore,
needles, and severing said yarn end while so positioned
a branch passage extending downwardly from an inter
by said air blast.
mediate section of said bore and opening above said dial
12. In the operation of a circular knitting machine
cap, a yarn clamp pivotally mounted on said housing for
having a rotary cylinder with independent needles, a dial
vertical movement, resilient means urging said clamp 75 cap mounted adjacent the top of said cylinder, a group
spams"?
11
of individually retractable interchangeable yarn feeds,
and yarn severing means disposed peripherally of said
12
.
said air stream, and retaining the several yarn end at the
point of tension application.
16. In the operation of a circular knitting machine
dial cap at a point angularly spaced from said yarn teed
having a rotary cylinder with independent needles, a
group in the direction of cylinder rotation, the method
dial cap mounted adjacent the top of said cylinder, a
comprising the steps of applying suction to a yarn end be
group of individually retractable interchangeable yarn
ing carried by said needles over said dial cap, directing an
feeds, and a shear disposed peripherally of said dial cap
air stream at said yarn end between the point of suction
at a point angularly spaced from said yarn feed group
application and said yarn severing means as said yarn
in the direction of cylinder rotation, the method com
end moves into proximity to said yarn severing means,
said air stream being directed in the direction of cylinder 10 prising the steps of withdrawing a yarn from active knit~
ting by retraction of one of said yarn feeds, whereby
rotation whereby said yarn end is bellied out to extend
said yarn is carried by the last needle to knit around said
substantially radially inwardly from said needles, and
cylinder and over said dial cap, applying tension to the
severing said yarn end while so positioned by said air
withdrawn yarn end by suction applied at a point trailing
stream.
‘ 13. In the operation of a circular knitting machine 15 said yarn feed group and leading said shear in the direc
tion of cylinder rotation, directing an air stream at said
having a rotary cylinder with independent needles, a
yarn end between the point of suction application and
dial cap mounted adjacent the top of said cylinder, a
said shear as said yarn end is carried by the last needle‘
group of individually retractable interchangeable yarn
to
knit into proximity to said shear, said air stream beingv
feeds, and a shear disposed peripherally of said dial cap
at a point angularly spaced from said yarn feed group 20 directed in the direction of cylinder rotation whereby said
yarn end is bellied out to extend substantially radially
in the direction of cylinder rotation, the method com
inwardly from said needles, shearing said yarn end while
prising the steps of applying tension to an inactive yarn
so positioned by said air stream, and engaging the severed
end extending over said dial cap at a point trailing
yarn end by means of said suction.
said yarn feed group and leading said shear in the
In the operation of a circular knitting machine
direction of cylinder rotation, inserting said inactive yarn 25
having
a rotary cylinder with independent needles, a ‘dial
while so tensioned into the needles for knitting, directing
cap mounted adjacent the top of said cylinder, a group
an air stream at said yarn end between the point of ten
of individually retractable interchangeable yarn feeds,
sion application and said shear as said yarn end is carried
and a shear disposed peripherally of said dial cap at a
by said needles into proximity to said shear, said air stream
being directed in the direction of cylinder rotation where 30 point angularly spaced from said yarn feed group in the
direction of cylinder rotation, the method comprising
by said yarn end is bellied out to extend substantially
the steps of applying tension to an inactive yarn end ex
radially inwardly from said needles, and shearing said
tending over said dial cap at a point trailing said yarn
yarn end while so positioned by said air stream.
feed group and leading said shear in the direction of cyl
14. In the operation of a circular knitting machine
having a rotary cylinder with independent needles, a dial 35 inder rotation, inserting said inactive yarn while so ten
sioned into the needles for knitting, then withdrawing a
cap mounted adjacent the top of said cylinder, a group
yarn from active knitting by retraction of one of said yarn
of individually retractable interchangeable yarn feeds,
feeds, whereby said yarn is carried by the last needle to
and a shear disposed peripherally of said dial cap at a
knit around said cylinder and over said dial cap, apply
point angularly spaced from said yarn feed group in the
ing tension to said withdrawn yarn, and shearing said yarn
40
direction of cylinder rotation, the method comprising
ends sequentially by a single stroke of said shear.
the steps of applying tension to an inactive yarn end
18. In the operation of a circular knitting machine
having
a rotary cylinder with independent needles, a dial
point trailing said yarn feed group and leading said shear
cap mounted adjacent the top of said cylinder, a group
in the direction of cylinder rotation, inserting said in
of individually retractable interchangeable yarn feeds,
active yarn While so tensioned into the needles for knit
and a shear disposed peripherally of said dial cap at a
ting, directing an air stream at said yarn end between
point angularly spaced from said yarn feed group in the
the point of suction application and said shear as said
direction of cylinder rotation, the method comprising the
yarn end is carried by said needles into proximity to
steps of applying tension to an inactive yarn end extend
said shear, said air stream being directed in the direction
of cylinder rotation whereby said yarn end is bellied out 50 ing over said dial cap by suction applied at a point trail
mg said yarn feed group and leading said shear in the di
to extend substantially radially inwardly from said nee
rection of cylinder rotation, inserting said inactive yarn
dles, shearing said yarn end while so positioned by said
while so tensioned into the needles for knitting, then With
air stream, and then removing the several yarn end by
drawing a yarn from active knitting by retraction of one
means of said suction.
15. In the operation of a'circular knitting machine 55 of said yarn feeds, whereby said yarn is carried by the
last needle to knit around said cylinder and over said
having a rotary cylinder with independent needles, a dial
dial cap, applying tension to said withdrawn yarn by
cap mounted adjacent the top of said cylinder, a group
extending over said dial cap by suction applied at a
of individually retractable interchangeable yarn feeds,
means of said suction, directing an air stream at said yarn
ends between the point of suction application and said
point angularly spaced from said yarn feed group in the 60 shear as said yarn ends are carried by said needles into
proximity to said shear, said air stream being directed
direction of cylinder rotation, the method comprising
in the direction of cylinder rotation whereby said yarn
the steps of withdrawing a yarn from active knitting by
ends are bellied out to extend substantially radially in
retraction of one of said yarn feeds, whereby said yarn
wardly from said needles, shearing said yarn ends while
is carried by the last needle to knit around said cylinder
so positioned by said air stream sequentially by a single
and over said dial cap, applying tension to the withdrawn 65 stroke of said shear, removing the severed newly inserted
yarn end at a point trailing said yarn feed group and
yarn end by means of said suction, and engaging the
leading said shear in the direction of cylinder rotation,
severed withdrawn yarn end by means of said suction.
directing an air stream at said yarn end between the
19. In a circular knitting machine having a circle of
point of tension application and said shear as said yarn 70 cylinder needles, a dial positioned inside of said circle of
end is carried by the last needle to knit into proximity
needles, and a plurality of movable yarn feeding ?ngers
to feed and withdraw yarns relative to said needles‘;
to said shear, said air stream being directed in the direc
the combination therewith of yarn cutting means to si-'
tion of cylinder rotation whereby said yarn end is bellied,
multaneously sever the leading end of a yarn fed to the
out to extend substantially radially inwardly from said
needles, shearing said yarn end while so positioned by 75 needles and the trailing end of a yarn withdrawn from’
and a shear disposed peripherally of said dial cap at a
13
3,077,097
needles comprising a ?xed cutting blade carried by said
dial and a movable cutting blade cooperating with said
?xed cutting blade, pattern controlled means for moving
14
movable blade to sever in a single stroke yarns from a
plurality of the yarn feeding ?ngers.
21. A circular knitting machine as de?ned in claim 20
said movable blade and suction means for creating suc
tion currents to attract the yarn ends severed by said 5 wherein said pattern controlled means includes a cam
shaped to close said movable blade over a discrete period
yarn cutting means, said suction means comprising a suc~
of time corresponding to the passage or" several needles.
tion nozzle disposed in the path of yarns extending from
said yarn cutting means to said yarn feeding ?ngers.
References (Jited in the ?le of this patent
20. In a circular knitting machine having a rotary cylin
der with independent needles, a dial cap mounted adja 10
UNITED STATES PATENTS
cent the top of said cylinder and a plurality of individ
ually retractable yarn feeding ?ngers, yarn severing means
1,237,256
Scott ________________ __ Aug. 14, 1917
disposed peripherally of said dial cap at a point angu
larly spaced from said yarn feeding ?ngers in the direc
tion of cylinder rotation, said severing means comprising 15
a ?xed cutting blade carried by said dial cap and a mov
abut cutting blade cooperating with said ?xed cutting
blade, and pattern controlled means for moving said
1,836,720
2,269,757
Lawson et al. ________ __ June 21, 1932
Davis ________________ _. Jan. 13, 1942
2,424,033
2,560,484
2,580,513
2,712,805
Hilker et a1 ___________ __ July 15,
Schoenster et a1. ______ __ July 10,
Brown ______________ __ lan. 1,
Peterson et a1 ___________ __ July 12,
1947
1951
1952
1955
///
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
February 12v 1963
Patent Non 3QOTZ nO97
Vaughn H‘ Butler
It is hereby certified that error appears in the above numbered pat
ent requiring correction and that the said Letters Patent should read as
corrected below.
column ll‘Y
and column 12‘, line l‘l for "severaP‘v each occurrences,
line l‘1 before "needles" insert
line 53‘1
Column 2‘l line 65'V for "at" read -»— as -=—;
read M severed M; column 13,,
g“
‘gun
Signed and sealed this 8th day of Oct
(SEAL)
Attest:
ERNEST W. SWIDER
Attesting Officer
ober 1963o
EDWIN Ln REYNOLDS
AC 13 1 ng Commissioner of Patents
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