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Патент USA US3087459

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April 30, 1963
“r. 1.. GRAVES
THREAD CUTTING MEANS FOR SEWING MACHINES
Filed Oct. 3' 1960
2 Sheets-Sheet 1
1
THOMAS L. GRAVES
ATTORNEYS
April 30, 1963
-
T. L. GRAVES
3,087,449
THREAD CUTTING MEANS FOR SEWING MACHiNES
Filed Oct. 3, 1960
2 Sheets-Sheet 2
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INVENTOR
THOMAS L. GRAVES
BY WZWAéYMW
ATTORNEYS
U ited tates
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1
ice
3,087,449
Patented Apr. 30., 1963
2
FIGURE 2 is a side elevation view of the stacker ap~
3,087,449
paratus shown in FIGURE 1;
FIGURE 3 is a schematic circuit diagram for operat
ing the invention; and
THREAD CUTTING MEANS FOR SEWING
MACHINES
Thomas L. Graves, Greensboro, N.C., assignor to Burling
ton Industries, Inc., Greensboro, N.C., a corporation of
FIGURE 4 is an alternative embodiment of the sche
Delaware
matic circuit diagram of FIGURE 3.
Referring speci?cally to the drawings, and in particu
lar to FIGURE 1, reference numberal 10 indicates the
Filed Oct. 3, 1960, Ser. No. 59,907
4 Claims. (Cl. 112—252)
This invention relates to a new and novel seaming 10 head of a conventional seaming machine such as manu
factured by the Singer Manufacturing Company, and
apparatus involving conventional seaming machines for
seaming stockings in succession, wherein the seaming
described in “Singer Hosiery Seamer Catalog 242-1”; or
by the Union Special Machine Company, more fully de
machine operates continuously to produce a seaming
chain extending between successive seamed stockings.
scribed in Christensen reissue Patent 22,094. The ma
chine comprises the usual ?anged feeding cups 12 and
'14, driven respectively by the vertical shafts 16 and 18.
This seaming chain must be severed in order to separate
the successive stockings and, accordingly, this invention
Also associated with the feeding cups are such standard
elements as the stitch ?nger, needle bar and needle, and
the presser plate, all of which are omitted for clarity.
has particular reference to an apparatus for severing the
seaming chain joining normally successive seamed stock
ings, and stacking the stockings after the seaming chain
has been severed.
Conventional seaming machines of the type for seam
ing full-fashioned stockings are generally equipped with
a stationary cutting member for severing the seaming
chain joining normally successive stockings, the operator
20
The uncurler is indicated generally at 20, being shown
in both its operative and inoperative positions, the in
operative position being indicated by dotted lines. The
uncurler 21) includes uncurler guide members 22, and
uncurler arm 24 which is pivotally mounted to shaft 26
or" the machine being required to move the seaming chain 25 on the machine head 10. The uncurler 20‘ also has a
to the cutting member for cutting the stocking there
from. This manual operation is recognized to be a tedi
ous chore, which decreases the productivity of the seam
hand lever (not shown) which is utilized by the machine
operator to pivot the uncurler 20 into and out of its
operative position, adjacent the infeed side of the feed
ing cups 12 and 14. All of the elements described to this
ing machines; and, diverse efforts have been directed to
point are conventional.
wards providing improved devices operative to sever the 30
As is well known, in conventional full-fashioned seam
seaming chain after the stocking has been properly
ing operations a stocking passes between the feeding cups
seamed.
-12 and 14 of the machine and is progressively seamed
After the seaming chain has been severed, the stock
from the toe to the welt end thereof. After a stocking
ing is placed over a rack by the operator, and after a
has been completely seamed, the stitching instrumentali
number of stockings have been thus seamed and their 35 ties
continue to operate, producing a seaming chain which
seaming chains severed, the stockings may be moved to
extends to the next stocking seamed. In FIGURE 1, a
another place for subsequent processing. With such con
completely seamed stocking 11 is shown on the outfeed
ventional procedures, the machine operator is required
side of the feeding cups, and a seaming chain 13 extend
to move the stocking to a rack where the successive
ing
from the welt end of the stocking to the machine
40
stockings are piled. This manual stacking operation, as
needle.
is the case with the manual severing operation, is a repeti
In accordance with the present invention, a severing
tious chore which causes machine operator fatigue and
device 30 is provided, together with a stacking device
reduces the productivity of conventional seaming ma
100, these devices operating in timed relationship to sever
chines.
the seaming chain 13 joining successive stockings, and
The present invention involves and has for its principal 45 then to stack the stocking 11 as it falls from the feeding
object the provision of an improved seaming machine
cups 12 and ‘14.
whereby the seaming chain joining normally successive
The severing device 30‘ includes an inverted L-shaped
stockings is severed and the stockings, upon falling, are
bracket 32. having a horizontal leg member 34. The
stacked in a remote position, thus eliminating the manual 50 bracket 32 is secured to the seaming machine head 10, by
severing and stacking operations normally required of
machine screws 36, or the like. Thus, the bracket is
the machine operator.
positioned at what might be termed the rear of the feed
Another object of this invention is to provide an im
ing cups 12, 14, opposite to the side of the cups where
proved seaming machine having a heated seaming chain
the operator normally stands. The bracket 32 has dis
severing device and a stacking device which are operated 55 posed on the underside of the horizontal member 34, two
by actuation of solenoids or the like in timed relation
trunnions 37, and mounted on the upper side of the hori
ship to sever the seaming chain and move the stocking
zontal leg member 34 by suitable screws 39‘ or the like
which has been severed to a remote position.
is a feed solenoid 38. The feed solenoid 38 has power
A further object of this invention is to provide a sever
leads 40 connected in a suitable actuating circuit, as will
ing and stacking apparatus for a seaming machine which 60 be more fully described hereinafter.
The feed solenoid 38 also has a reciprocable arm 41 on
is positive and trouble free in operation, is useful with
which is mounted an armature 42. Also attached to sole
seaming machines of all sizes, and is of inexpensive and
noid arm 41 is a vertical cross arm 43, which is secured
durable construction. The apparatus furthermore great
thereto, as by screw and bolt fastener 44. Disposed at
ly reduces machine operator fatigue and results in in
each end of the cross arm 43 are upper and lower mount
65
creased machine output.
ing blocks 46 and 48, respectively, having apertures there
The invention and the novel features thereof may best
through. Passing through the aperture in the upper
be made clear by reference to the following description
mounting'block 46 is an offset link 50, which is secured
and the accompanying drawings in which:
at one end to the upper mounting block ‘46 by a locking
FIGURE 1 is a perspective view of a conventional 70
screw 52., while the other end of link 50 is slidably re
seaming machine including a preferred embodiment of
the present invention;
ceived in an aperture extending through a bracket 54,
which extends from the machine head 10. On the oppo
8,087,449
3
4.
site side of bracket 54, and adjustably secured to the link
50, is an adjusting member 56 having a locking screw 58
therein, which engages the link 50. This adjusting mem
ber 56 is in abutment with the bracket ‘54 when the link
50 is in its rearward, inoperative position, as shown in
FIGURE 1. The position of the adjusting member 56
along the axis of link 50 thereby regulates the rearward
position of the link 50. Also adjustably mounted on the
forward end of the link 50 is a collar 60‘ which is secured
thereto by an appropriate locking screw 62.
10
gear 120 is rotatably mounted to engage the rack 116.
Extending from the gear 120 is a stacker rod 122, to
which is secured a radially extending stacker plate 124.
The stacker rod 122 is biased in a clockwise direction by
a spring 125. The stacker plate 124 preferably has a
The shaft 26 on which the uncurler arm 24 is mounted
has a mechanism responsive to the reciprocating move
placed such a distance from the stacker rod 122 so as not
mounted on the shaft 26 is a downwardly extending cam
the stacker solenoid 104 are connected in parallel to a
source of power, as for example, a DC. generator G.
recessed, curved portion 130 onto which the stocking
11 will slide down upon being progressively seamed.
A retaining rod 132 extends outwardly from the plate
182, or the machine frame, and is disposed generally
parallel to the stacker rod 122. The retaining rod 132 is
to interfere with the rotation of the stacker plate 124.
Figure 3 shows a schematic wiring diagram for operat
ment of the link 50 and the collar 60, for pivoting the
ing the severing device 30 and the stacking device 100 in
uncurler 20 out of its operative position adjacent the
infeed side of the feeding cups 12 and '14. Operatively 15 proper time delay relationship. The feed solenoid 38 and
member 64 which normally abuts against the collar 60,
when the uncurler 20 is in its operative position adjacent
The heating element 83 may be connected in series with
the feed solenoid 38, or alternatively, to a separate power
member 64 also has a ?ange 66 extending therefrom, this 20 source. The time delay in the operation of the feed
solenoid 38 and the stacker solenoid 104 is accomplished
?ange 66 having a detent edge 68. Counterclockwise rota
by a simple R-C circuit 133, in series with the stacker
tion of the cam member 64, as viewed in FIGURE 1,
solenoid 104, or by more elaborate time delay circuits,
thus rotates uncurler arm 24 on the shaft 26. A pawl 70
the infeed side of the feeding cups 12 and 14. The cam
having a ?nger 72 is biased downwardly and inwardly
toward the machine head 10, adjacent the ?ange surface
66, by a spring 74, the pawl 70 and the spring 74 being
disposed on a suitable mounting screw 76.
The lower mounting block 48 has a guide rod 80 ex
tending therethrough, which is ?xedly secured within the
mounting block 48 by a locking screw (not shown), simi
lar to the locking screw 52 on the upper mounting block
46. The guide rod 80 is slidably mounted in the trun
nions 37 and has a spring 82 under compression thereon.
as are known to those skilled in the art.
A make-or
break switch 134 is actuated by a foot or knee lever 136,
which is appropriately pivoted to the machine frame or
the like, at 138.
In FIGURE 4 an alternative schematic circuit diagram
is shown whereby the time delay is accomplished by two
make-or-break switches 134A and 134B, which actuate
the feed solenoid 38 and the stacker solenoid 104, respec
tively. Again, a suitable foot or knee lever 136, pivoted
to the machine frame or the like at 138, is operable to
The spring 82 is compressed between the mounting block'
sequentially close the switches 134A and 134B.
48 and the left-hand trunnion 37, as shown in FIGURE 1.
arrangement, preferably two power sources are used, as
On the opposite end of the guide rod 80 is a hot wire
severing mechanism comprising a U-shaped heating ele
for example, D.C. generators G1 and G2, respectively.
ment 83, preferably made of Nichrome wire or similar
material. The heating element 83 has an electrical con
nector post 84 extending therefrom, to which an electri
cal lead 86 is suitably secured. Another electrical lead 87
is connected thereto to provide electric current to the
heating element 83.
A safety shield 90 extends over the end of guide rod 80
and the heating element 83, the safety shield 90 having a 45
forwardly facing recess 91. The safety shield 90 is pivot
ally mounted through an aperture therein on a member
(not shown) extending from the horizontal leg member
34, to which a spring-biased pin 92 is secured, providing
In this
Again, the heating element 83 may be connected in series
with the feed solenoid 38, as shown in FIGURE 4, or
connected through a separate circuit ‘with a switch therein,
to an alternative source of power, such as a low-voltage
transformer.
Various additional circuits, which will effectively op
erate the apparatus, will be apparent to those skilled in
the art.
Operation
The operation of the apparatus will best be understood
in connection with the seaming of full-fashioned stock~
ings. With the uncurler guide 20 in inoperative position,
for pivotal movement of the safety shield90 on a vertical 50 a stocking to be seamed is positioned between the guide
axis. Extending upwardly from the guide rod 80 into the
members 22 thereof, and the uncurler guide then moved
recess 91 of the safety shield 90 is a pin 88. It will be
to operative seaming position adjacent the infeed side of
apparent that forward movement of the guide rod 80 and
the feeding cups 12 and 14 of the machine. The stock
pin 88 will cause the safety shield 90 to be pivoted lat
ing is progressively fed through the stitching instrumen
erally out of the way of the heating element 83 toward 55 talities by rotation of the feeding cups 12 and 14, and the
the machine head 10, by virtue of the force of the pin 88
stocking is progressively seamed from toe end to welt
on the forward edge of the recess 91. Conversely, the pin
end. Upon completion of the seaming operation, the
88 will be biased against the rear edge of the recess 91,
machine operator permits the machine to form a seaming
when the guide rod moves rearwardly, to pivot the safety
chain 13 of, for example, three quarters of an inch or an
60
shield 90 back over the heating element 83. In this re
inch in length. It will be understood that this is the
gard, the rear edge of the recess 91 extends laterally
length of the chain before severing. When the chain is
slightly beyond its forward edge to ensure contact with
severed, one half of this chain will extend from the welt
the pin 88, as the pin moves to the left as shown.
end of the stocking just seamed, and the other half will
The stacking device 100 operates in conjunction with
be at the toe of the next stocking to be seamed.
the severing device 30 to stack the stocking 11 after it 65 During the progress of the seaming of the stocking
falls from the seaming position. The stacking device
from the toe end to the welt end, the toe end of the
100 comprises a plate 102 which is secured to the machine
stocking emerges from the outfeed side of the feeding cups
frame in any suitable manner (not shown). Mounted on
and hangs down. As the toe end of the stocking moves
the plate 102 is a stacker solenoid 104, having a recipro
downwardly, it encounters and slides down the surface
cating arm 106, on which an armature 108 is mounted. 70 of the stacker plate 124, which is disposed slightly below
The stacker solenoid 106 is connected in a suitable circuit
the feeding cups 12 and 14 and preferably at an angle
by electrical leads 110 (FIGURE 2). Also fastened to
thereto, as illustrated in FIGURES l and 2. When the
the solenoid arm 106 by a pin 112 (FIGURE 2) is a yoke
seaming operation is complete, the seamed stocking hangs
114, to which a rack 116 is connected. This rack 116
is slidably disposed within a housing 118, within which a 75 from the seaming chain, with the major portion of its
‘3,087,449
'3
7
length lying on the upper surface of the stacker plate
124, as shown in FIGURE 1.
At the end of a seaming operation, and when a length
of seaming chain 13 has been formed, the machine op
erator depresses a foot or knee lever 136 which actuates
in timed, sequential relationship the seaming chain sever
ing device 30, and a brief interval of time thereafter the
stocking stacker device 100, by closing a switch 134, or
by sequentially closing switches 134A and 134B, in an
to open and break the circuit through the feed and stacker
solenoids. When the feed solenoid 38 is de-energized,
spring 82 returns link 50 and guide rod 80 to withdrawn
position. Withdrawal of guide rod 80‘ retracts the heat
ing element 83 from the vicinity of the feeding cups, and
in the course of this movement pin 88 encounters the rear
edge of the shield recess 91, pivoting the shield to normal
position enclosing the heating element, whereby accidental
contact with the heating element is precluded. Withdrawal
appropriate circuit, as shown in FIGURES 3 and 4, re 10 of the link '50 also retracts the collar 60, permitting the
spectively. Referring to FIGURE 3, when switch 134
uncurler to be moved by the operator to operative posi
is closed by lever 136, a circuit through feed solenoid
tion adjacent the feeding cups.
38 is energized, and the armature 42 is displaced toward
It will be noted that there is no positive connection
the solenoid, to the right as viewed in FIGURE 1. By
between the collar 60 and the cam 64 associated with the
virtue of their linkage to armature 42, link 50 and guide 15 uncurler 20. It follows that the uncurler 20 must be
rod 80 are also displaced to the right, through vertical
moved to operative position by the operator, and this
cross arm 43 and mounting blocks 46 and 48, respectively.
may be accomplished by moving the pawl ?nger 72 out of
As link 50 is displaced to the right, the collar 60 car
engagement with detent edge 68 of the ?ange 66, and
ried thereby encounters cam 64 and rotates shaft 26,
then pivoting the uncurler. Further, the operator is free
whereby the uncurler arm 24 is displaced to inoperative
to displace the uncurler in either direction, when the
position, illustrated in ‘dotted lines in FIGURE 1. Upon
severing and stacking mechanism is at rest.
displacement of the uncurler 20, the ?nger 72 on pawl 70
When the stacker solenoid 104 is de-energized, the
engages the detent edge 68 of ?ange 66-, whereby the un
mechanism is returned to normal inoperative position
curler is maintained in inoperative position until displaced
by spring 125, the stacker rod 122 and stacker plate 124
therefrom by the machine operator.
25 being rotated to the solid line position of FIGURES 1
Actuation of feed solenoid 38 also displaces guide rod
and 2. A suitable stop may be provided to limit this
80 to the right, as previously noted, and this movement of
the guide rod 80 carries the heating element 83 into en
gagement with the seaming chain 13 extending between
the seamed stocking and the stitching instrumentalites.
The heating element 83 may be maintained at high tem
perature, or conventional means may ‘be provided to heat
movement to normal position. This completes a cycle
of operation, and the operator may position the next
stocking to be seamed between the guide members 22 of
the uncurler guide, and then move the uncurler guide into
" operative seaming position.
As indicated, it is desirable that the stacker solenoid
be energized a brief interval of time after energization
severs the seaming chain on contact, separating the seamed
of the feed solenoid. This sequence of operations may be
stocking from the machine head and permitting it to fall. 35 accomplished in any convenient manner, within the skill
It will be noted that movement of the guide rod 80 and
of those versed in the art. A simple and convenient ar
the heating element 83 carried thereby, toward the feed
rangement for accomplishing this is illustrated in FIG
ing cups, automatically pivots the safety shield 90‘ about
URE 4, where separate switches 134A and 134B are
pin 92 laterally toward the machine head 10. As will be
provided for the feed solenoid and stacker solenoid cir
readily understood, movement of guide rod 80 causes
cuits, respectively. The positional relationship of the
the upright pin 88 extending therefrom to engage the
switches 134A and 134B insures that as lever 136 is dis
forward edge of the shield recess 91, the inclination of
placed, it will encounter and close switch 134A very
the recess edge being such as to pivot the shield lateral
slightly before it encounters and closes switch 134B.
ly as the guide rod pin proceeds in its path. Actuation
It will, therefore, be seen that there has been provided
of the feed solenoid 38, then, is effective both to displace
by this invention a structure in which the various objects
the uncurler to inoperative position, and to sever the 45 hereinbefore set forth, together with many practical ad
seaming chain and free the seamed stocking.
vantages, are successfully achieved. As various possible
A very brief interval of time after actuation of feed
embodiments may be made of the mechanical features of
solenoid 38, the stacker solenoid 104 is energized. This
this invention, all Without departing from the scope there
interval may be effected, as illustrated in FIGURE 3,
of, it is to be understood that all matters herein set forth
by a simple time delay circuit 133 in series with the stacker 50 or shown in the accompanying drawings is to be inter
solenoid. When the stacker solenoid is energized, its
preted in an illustrative, and not in a limiting sense.
armature 108 is displaced to the left as viewed in FIGURE
I claim:
2, whereby the rack 116 is correspondingly displaced, and
1. Apparatus including a seaming machine having a
the engaged gear 120 rotated. Rotation of gear 120
pair of feeding cups, said cups having contacting ?anges
rotates stacker rod 122 ‘and the stacker plate 124 ex 55 for feeding a stocking therebetween to be seamed; sole
tending therefrom. The rack 116 is designed so that
noid means mounted on said apparatus to the rear of
energization of the stacker solenoid causes the stacker
said feeding cups and including operating link means mov
rod 122 and stacker plate 124 to rotate approximately
able towards and away ‘from said feeding cups in trans
120°, in counterclockwise direction.
verse relationship to the axis of rotation of said feeding
Accordingly, immediately after the seamed stocking
cups, said operating link means including a heating ele
is separated from the seaming chain by the severing de
ment carried in facing relationship to the contacting ?anges
vice 30, and substantially as the stocking begins to fall,
of said feeding cups and movable thereby to a thread
the stacker plate 124 rotates and displaces the severed
severing position intermediate said ‘feeding cups to there
stocking to a position immediately above the retaining bar
by lbreak a seaming chain.
132. The movement of the stacker plate 124 is suffi 65
2. Apparatus as de?ned in claim 1 further including an
ciently swift to cause the seamed stocking to be in sub
uncurler guide mounted adjacent said feeding cups and
stantially horizontal position, with welt end outward,
movable into and out of seaming position, and a link
when it encounters the retaining rod 132. The stocking
operatively connected to said solenoid for moving the un
thereupon ‘folds over the retaining rod 132, and remains
curler guide out of seaming position when said solenoid
thereon. As will ‘be understood, a dozen or more stock 70 is actuated.
ings may be stacked one upon another on the retaining
3. Apparatus as de?ned in claim 1 further including
rod in this fashion, and removed therefrom at the conven
a safety shield normally enclosing said heating element,
ience of the operator.
and means for moving said safety shield out of normal
When the seamed stocking has been severed and stacked,
position when said heating element is moved to the seam
the operator may release lever 136, permitting switch 134 75 ing chain severing position.
it prior to each severing operation.
The hot element
3,087,449
7
4. Apparatus including a seaming machine having a
pair of ‘feeding cups, said cups having contacting ?anges
for feeding a stocking therebetween to be seamed; sole
noid means mounted on said apparatus to the rear of
said feeding cups and including operating link means
movable towards and away ‘from said ‘feeding cups in
transverse relationship to the axis of rotation of said
feeding cups, said operating link means including a heat
ing element carried in facing relationship to the contact
~ a
means operative in response to actuation of said feed sole~
noid to move said operating link means toward said feed
ing cups to thereby move said uncurler guide out of a
seaming position adjacent said feeding cups.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,256,671
1,429,301
Flower ______________ __ Feb. 19, 1918
Schutte _____________ __ Sept. 19, 1922
in response to movement of said heating element towards
said feeding cups; said apparatus also including an un
1,847,812
2,517,485
2,522,811
2,685,854
2,894,648
2,909,135
2,931,330
curler guide mounted adjacent said feeding cups, and
3,008,437
Burton et al. __________ __ Mar. 1,
Henning _____________ __ Aug. 1,
Bishop et al. _________ __ Sept. 19,
Ackerman et al. ______ __ Aug. 10,
Mussett _____________ __ July 14,
Shoaf ________________ __ Oct. 20,
vPinkvoss et al. ________ .._ Apr. 5,
Herr _______________ __ Nov. 14,
ing ?anges of said feeding cups and movable thereby to 10
a thread severing position intermediate said feeding cups
to thereby break a seaming chain; a safety shield mounted
for movement between the end of said heating element
and said feeding cups, and a laterally displaced position
1932
1950
1950
1954
1959
1959
1960
1961
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