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Патент USA US2411977

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Dec» 3, 1946-
. ~J. l-LvPlKu’L
2,411,977
` SEWING MACHINE
` ' Filed Feb. 21. 1944
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J. H. PlKuL
2,41 1,977
" SEWING “cams
Fuga Feb. 21, 1944
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2,411,977
SEWING MACHINE
Filed Feb. 21, 1944
'7 sheets-smet 5
Dec. 3, 1946.
`
2,411,977
JQH. PIKUL
SEWING- MACHINE
Filed Feb. 21, 1944
'I sheets-sheet 6
INVEN‘Ã' da
’
I
__ky \'
¿LQ-942.
, Patented
3, 1946 I
- UNITED `STATES PATENT oFFl-CE j
Joseph H. Pikul, West Newton; Mass., assigner
to The Reece Corporation, a corporation of
Maine
Application February 21, 1944,_serial No. 523,113
s claims. _(01. 11a-197)
1
This invention relates to machines for forming
stitches in material.
.
Heretofore, when chain stitches were resorted
to in machine sewing, it was necessary to termi
nate any group o-f continuous chain stitches with
a conventional tying stitch in order to secure
'
2
Fig. 13 is a greatly magnified section through
a partly completed, securing stitch obtained withI
the modiñed element of Fig. 12,'the section being
similar to the section of Fig. 5.
Fig. 14 is a, section similar to Fig. 13, showing
the secured stitch completed.
_
Fig. 15 is a greatly magniñed illustration of a'
straight seam of chain stitches secured against
the entire group of stitches against unravelling.An example of a sewing machine of this type is
unravelling in accordance with'the present in
shown and described in my prior Patent No.
vention.
'
10
2,131,387, dated September 27, 1938. While a
Fig. 16 is another greatly enlarged, fragmen
conventional tying stitch secures a group of
tary sectional view of a part of the stitch-form
chain stitches in a satisfactory manner, its for
ing mechanisms of the machine.
mation by the same instrumentalities which form ’
Fig. 17 is a fragmentary sectiona1 view similar
the chain stitches involves at least a diii’erent «
to Fig. 16, showing modified structure for secur
15
operation of these instrumentalities, which com
ing chain stitches against unravelling.
plicates the machine and accordingly increases
Fig. 18 is a fragmentary section taken substan
the cost of the same.
- tially on the line i8-I 8 of Fig. 17.
It is the primary aim and object of the present
Fig. 19 is a side elevation, partly broken away,
invention to make provision in a sewing machine
of the .machine which incorporates the stitch-`
20
for securing a machine-sewn group of continuous
securing mechanism of the present invention.
chain stitches against unravelling without re-Fig. 20 is a plan view, partly broken away, of
sorting to a conventional tying stitch and without
the machine as shown in Fig. 19.
requiring a different operation of thev stitch
Fig. 21 is an end elevation, partly broken away,
forming instrumentalities of the machine.
of the machine as viewed from the left in Figs.
The invention will be vmore clearly understood- 25
19 and 20.
Y
~
from the following description in commotion
Fig. 22 is an end elevation of themachineas
_with the accompanying drawings, in which:
viewed from the right in Figs. 19 and 20.
Fig, 1 is a. greatly magnified bottom view of an.
piece of material holding a series of chain stitches
which are secured against unravelling in ac
cordance with the present invention. .
Fig. 23 is an end elevation similar to Fig. 22,v
showing certain parts in a differentv relative posi
tion.
.
,
Referring to the drawings, Fig, 1 illustrates
Fig. 2 is a section taken substantially on the
greatly magniiied the back side of a piece of ma
line 2-2 of Fig, l. and illustrates theconven
terial W in which successive chain stitches 30 are
tional concatenation of the loops of a. chain stitch.
formed.
By way of example, these stitches are
35
Fig. 3 is a section taken substantially on the
shown as arranged in zig-,zag fashion. The for- \
_line 3-3' of Fig. l. and showsan intermediate
.step in securing the lastv stitch of a group of . mation of the chain stitches is conventional, the
machine which may be used for this purposechain stitches against unravelling.
providing a reciprocatory and laterally vibratory
Fig. 4 is a section similar to Fig. 3, showing the
40 needle 3| (Fig. 21) and two loopers'32 whichal
last stitch completed.
ternately cooperate with the needle 3l in the for
Figs. 5 and 6 are sections taken substantially
mation of successive chain stitches. Fig. 7 il
on the lines 5-5 and 6--6. respectively, ot Figs.
lustrates a. step in the normal cooperation of the
3 and 4, respectively.
needle 3l and one of the loopers 32 in the forma
Fig. '7 is a greatly enlarged, fragmentary sec`
45 tion‘of the chain stitches, the looper 32' having
tional view of the stitch-securing mechanism of
seized the thread loop l cast by the needle 3l
a machine embodying the present invention.
on its preceding ascent through the hole -h in the
Figs. 8 and 9 are fragmentary sectional views
material, and deflected it into the position shown
similar to Fig.l '7, showing progressive steps in
in Fig. 'l in which said loop is in alignment with
the operation of the mechanism in securing the
last stitch of a series of chain stitches.
‘,Figs. 10 and 11 are fragmentary sections taken
substantially on the lines Iii-l0 and |I----l i, re
spectively, of Figs, 7 and 9, respectively.
i
f Fig. 12 shows a modified element of the stitch
securing mechanism of the machine.
50 the needle in the left end position of its lateral
vibration.
A
After the machine has sewn a group of con
tinuous chain stitches, the needle. 3l and the
looper 32' will come to rest in the relative dispo
55 sition shown in Fig. 'l with~ the last loop l held on
2,411,977
said looper. While the last loop l is thus heid
on the looper 32', a blade or deñector 33 below
the throat plate 34 is linearly moved from the
position shown in Figs. 7 and 10 into the position
‘ shown in Figs. 9 and 11 to deflect the diverging
legs of said loop l. The defiector 33 is provided
with a slot 35 (Fig. 10) of a width substantially
equal to the thickness of the needle 'thread t,
and a wedge-shaped notch 36 which leads int-o
4
the thread of the preceding loop l' is so great
that the thread of said loop l as well as of the
loop l' is stretched within the llimit of its resil
iency, and the contracted loop l’ draws the loop
l against the loopl” with such force that the
engaged portions of said loops are considerably
deformed and constricted (Figs. 3 and 5). The
-thread of the contracted loop l' is in fact
stretched to such an extent that the withdrawal
the slot 35. Hence, o-n movement of the deflector 10 therefrom of ‘the severed end of the loop l does _
33 from the position shown in Fig. '7 into that
not cause any noticeable relaxation of its ñrm
shown in Fig. 9, the two legs of the loop l are
grip on the remaining portion of the severed loop
guided toward the slot 35 by the notch 35 and
l, the loop l' having suflicient resiliency to con
enter said slot one behind the other. In the pres
tract‘and hold the adjacent portion of the re
ent instance, the deñector 33 is so coordinated 15 mainder of the severed loop l deformed and con
with the looper 32' that the slot 35 in said de
stricted as shown in Figs. 4 and 6. That the loop
ñeotor is in line with the rear leg Zx of the loop l.
l' is under permanent tension and does not
so that, on movement of said deflector from the
noticeably relax its firm grip on the severed loop
position shown in Figs. 7 and 10 into that shown
l, even after the withdrawal of the severed end
in Figs. 9 and 11, s‘aid leg Zx enters said slot 35 20 thereof, is evidenced by a very marked cross
without engaging a wall of the V-shaped notch
sectional constriction of the leg lx between the
36, While the front leg IY of the loop l is cammed
loop l' and the material W (Fig. 4) as observed
into the slot 35 by the wall 36’ of the V-shaped
under a microscope. As also observed under the
notch 36. Consequently, the rear leg lx of the
microscope, the cross-over leg lz of the last stitch
loop Z will enter the slot 35 before the front leg ZY
is partly embedded in the material W (Fig. 4)
is cammed Athereinto, with the result that the
in consequence of the permanent tension in the
portions of these legs which extend from the de
thread of said last stitch. The tied chain stitch
iiector 33 substantially to the material W become
shown in Figs. 4 and 6 has deñed all ordinary
`superposed with the front leg ly nearest the ma
efforts to unravel or even_.loosen the same,
terial W (Figs. 8 and 9). Since the loop Z is being 30 wherefore said stitch serves as, and is in fact,
dlstended while being deflected, and since- the
a novel tying stitch which is as well secured
ecdle thread tension devices (to be referred to
against unravelling as. a conventional tying
hereinafter) of the machine resist with consid
stitch.
erable force the drawing of needle thread
Whereas the described deilector 33 has a provi- «
through the needle while the loop Z is being de
sion (narrow slotI 35) for forcing the deflected
iiected as described, the distending loop Z will,
draw thread from the preceding loop l' (Figs. 7
legs of the loop l into superposed relation along
the material W (Fig. 9), a modified deflector 45
and 8) until the latter is drawn tight. The rear
(Fig. 12) merely forces the diverging legs of the
wall 38 of the slot 35 inthe deliector 33 is rounded
loop l together. To this end, the defiector 45 has
as shown in Figs. 7 to 9 so as to avoid chaiing 40 a wedge-shaped notch 46 the bottom 41 of which.
the thread of the distending loop l. In order
is rounded. On movement of the defiector 45 in
to permit the contracting loop-Z’ to close as
the direction of the arrow 48 in Fig. 12, the di
tightly as possible about the legs of the loop l
verging legs of the loop l on the looper 32' will,
when the latter is being distended (Figs. 5 and
besides being deñected, also be forced into side
9), the deflector 33 brings the legs of _the loop l 45 by-side engagement with one another by the
preferably as closely as possible to the conver
rounded bottom 41 of the notch 46, resulting in
gence C of the legs of the preceding loop l’ (Figs.
the disposition of the legs of loop l in the con
9 and 11).` To this end, the deiiector 33 is ar
tracted loop l' as shown in Fig. 13. After sever
ranged to deflect the legs yoi.’ the loop l as closely
ance of the 4loop l and withdrawal of the severed
as possible to the material W (Fig. 9), the de
end thereof from the contracted loop l', the re
l'iected legs of the loop being received in a cut
maining end of the severed loop is wedged against
away portion 39 of the throat plate 34. To the
the contracted loop l' (Fig. 14) and against the
same end, the deiiector 33 is moved in such a
preceding loop l" in much the same fashion as
direction that the legs oi' the loop l between the
shown in Figs. 4 and 6.
deñector and the material (Fig. 11) pass the
Fig. 15 shows the novel tying `stitch applied at
convergence C of the legs of the loop l' as closely
the end of a straight seam of chain stitches 50,
as possible so that said loop l' may contract into
the contracted loop 5I of the last stitch firmly
i'lrm ,wedging engagement with >the legs ,of the
wedging the remaining end 52 of the last severed
loop l without undue restraint from the latter.
loop against the loop 53 which immediately pre
The contracting loop l', through intermediation 60 cedes the loop 5i. In view of the preceding, de
of the legs lX and ZY of the loop l. also draws the
tailed description of the formation of the novel
loop l", which immediately precedes the loop l', _
tying stitch at the end of a zig-zag seam of chain
ñrmly against the material W (Figs. 3 and 9).
stitches, the yformation of the. same tying stitch
Shortly before the deflector 33 reaches the most
at theend of a straight seam of chain stitches is
advanced position shown in Fig. 9, the same
too obvious to require further explanation.
brings the rear leg lx of the loop l into engage
Figs. 16 and 1’7 disclose a modified mode of tying
ment with a knife 40 on the looper 32' (Figs. 9
the last one of a series of chain stitches. The
and 11), whereupon said leg is severed as at 4|.
machine used for forming these stitches may be
On subsequent removal of the material W from
-like the one used for forming the stitches 30 in
the machine, the severed portion of the loop l 70 Fig. l, and comprise a reciprocatory and vibratory
which is continuous with the needle thread is
needle (not shown) carrying needle thread t, and
withdrawn from the material, leaving the severed
a pair of alternately operative loopers of which
rear leg lx of said loop l anchored between the
loops l' and l" (Figs. 4 and 6).
one is shown at 55. After the sewing instrumen
talities of the -machine come to rest with the
The pull exerted by the distending loop l on 75 needle retracted and the looper 55 in the position
2,411,977
f
shown in Fig. 16 and holding the last lloop 58, a.
deñector 51 unde-neath the throat plate 58 is
moved in the direction of the arrowy58 in Fig. 18
to deflect the‘front leg 56’ in the manner best
shown in Fig. 17, thereby distending the loop 56.
The deflected leg 56' of the distending loop 56
forces the preceding loop 60 against the material
W and the convergence of the legs of the loop 56. .
The distending loop 56, being unable to draw
f
6
,
to by a belt 18 alternatively engageable with fast
and loose pulleys ~18 and 80 under the control of '
f a'belt shifter 8|. vThe belt shifter 8| constitutes
an extension of a stop member or arm 82 carried
by an oscillating and longitudinallymovable rock
shaft 83, mounted for oscillation and limited ion
gitudinai movement in the bed 65.
Slidably
mounted in the stop arm 82 is a stop element or
bolt 84, normally urged toward the right in Figs.
22 and 23 by a springy 85. At its end the bolt 84
' needle thread‘through the needle thread tension 10
is formed with a nose 86 which, when the shaft
' devices (not shown)l of the machine, must' draw
83 "is in theI longitudinal position to cause the
thread from the preceding loops'60 and 6 I. Since
belt shifter 8| to engage the belt 18 with the
the loop 68 is prevented from contracting by the
loose pulley 80, is in the path of movement of
deflected leg 56’ of the last loop 56 (Fig. 17), the
a'cam 81 (Figs. 22 and 23)»which is fast on the
15
latter will draw thread from the loop 6| which
shaft 11, said cam having a concentric portion a,
immediately precedes the loop 60. The ensuing
contraction of the loop 6| draws the loop 60 into
firm wedging engagement with the material W
a rise b, a notch c and a stop shoulder d, arranged
to-engage the nose 86 in the order named when
the shaft is rotated in the direction of the arrow
arid the convergence of the legs of the loop 56
88 in Figs. 22 and 23. The nose 86, when in the
and at the same time forces said loop 6| toward 20 path of movement of the cam 81, is heid in en-‘
the convergence of the legs of the last loop 56
gagement with the periphery of the latter by a
(Fig. 17), so that, after-severance of the last loopv
spring-pressed plunger 88 carried by the upright
56 and withdrawal of the severed end of said loop
from the material, the ,end of the severed loop
66 and engaging the stop arm 82, rsaid `plunger
to turn said arm and the rock shaft 83
remaining in the material‘is held fairly securely 25 _tending
in a‘clockwise direction as viewed in Figs. 22 and
between the loops 60 and 6|. T_he deflector 51
23, and thereby press the nose. 86 against the pe
has preferably an inclined cutting edge 62 (Fig. `
riphery of the cam 81.
'
18) which engages and severs the rear leg 56"
A buttonhole cutter 80 is carried by a lever 8|.. .
of the loop 56 as at 63 when the front leg 56’
journalled on a short stud shaft 82 supported in
thereof is deflected as shown in Figs. 17 and 18. 30 the bed, said lever having an arm 83 carrying at
A last stitch tied in `this fashion, while not at
its end a sleeve'94 in'which is journalleda stud
firmly secured as the previously described stitch
95, having at one end a sleeve portion 86 which
shown in Fig. 4, for instance, is nevertheless
receives a stud 81 extending inwardly from the
satisfactory for many purposes.
’
stop arm 82.
Figs. 19 and 20 show an example of e. machine ’
The construction, arrangement and mode of
which may be equipped with mechanism to form
„operation of the parts -above referred to, and cer
the novel tying stitch shown in Figs. 4 and 6, for
_tain associated parts, are, or may be, substan
instance. This machine is a button hole sewing
tially as more fully described in the above-men
machine of the type known as “straight hole”
tioned patents. Associated with the sliding rock
machine, described, for example, in Patents Nos. 40 shaft 83 is a spring |00 (Fig. 20) surrounding said
714,284, November 25, 1902; 749.776, January 19,
shaft and interposed between a collar |0| thereof
1904; 1,088.652„Februari' 24» 1914; 1.402.073, Jan'
and one of the bearing brackets or ears |02 in _
uary 3, 1922; and 1.483.307, February 12, 1924.
which said shaft is mounted, said spring tending
The machine comprises a bed 65 from which rises
a standard 86, carrying an overhanging arm 61
spaced above the bed. The material or work W
is carried by a work clamp or holder comprising
a clamp plate 68 and cooperating clamping arms
68, said work holder being movable as a unit over
the bed, by mechanism not shown, in order to
position the stitches along the sides of the'but
tonhole. The stitch-forming instrumentalities
comprise the previously mentioned, eye-pointed
needle 3| above the work and cooperating loopers
or equivalent under thread handling devices 32
below the work, the throat plate 34 being .carried
by the bed 65 andhaving an opening> 10 through
which the needle operates. -The needle 3| is carried by a needle bar 1| which is longitudinally and
vertically reciprocated, by means generallyindi
cated at 12, in a needle bar guide 13, means (not
shown) being provided for oscillating said needle
bar alternately in opposite directions transversely
to the direction of feed of the work clamp be-r
tween successive strokes of the needle to position
the depth stitches. The,l thread -t from a suitable
source passes, through a take-up 14 and suitable
tension -devices 15 and 16, to the needle eye,
whence it passes through the work and throat.
plate to the loopers 32. The thread tension device
15 may be a thread ~clamp which is- preferably
closed during the setting of the laststitch so. as
to cause the tying of the last stitch with a maxi
mum force. A main shaft 11, journalled in suit
able bearings in the bed, has power applied there
f 'normally to move said shaft toward the right in
' Fig. 20 into the position shown in the drawings, in
v
which the belt 18 is engaged with the loose pulley
80 and the nose 86 of the stop bolt 84 is in the
pathV of-movement of the cam 81. To start thev
machine, a starting lever |08 is operated to move
the shaft 83 toward the left in Fig. 20, thereby
shifting the belt 18 from the loose pulley 80 to
the fast pulley 18 and moving >the nose 86 out of
the path of movement of the cam 81, said shaft
- being retained in this position by engagement of
a detent |04 with a recess- |05 therein.
The de
tent |04 is lcontrolled by mechanism (not shown)
associated with the feeding means for the work
clamp and adjustablel in accordance with the
length of the button hole to be sewn, the arrange
ment being such that just before the conclusion
of the sewing cycle, and at about the beginning
of the last stitch-forming cycle, the detent |64 is
withdrawn from the notch |05, whereupon the
»spring |00 causes the shaft 83 to be restored to
its normal position, thereby shifting the belt‘18
from the fast pulley 18 to the loose pulley 80 and
bringing the’ nose 86 into the path of movement
of the cam 81. During the formation of the last>
stitch, the machine runs under its own momen
'tum and the nose 86 follows the periphery of
the cam 81. ~As said >nose is engaged by the rise
y b of said cam, the stop arm 82 is lifted against the
action of the spring-pressed plunger 88 into the
75 position shown in Fig. 23. This lifting of the stop
2,41' 1,977.
8
arm 82 operates, through the stud 31 and its con
nection with thearm' 93 of the lever 9|, to ad
vance or depress the button hole cutter Il 'and
cause the same to cut the button hole slit. There
after, the nose 36 drops on of the rise b oi' the cam
31 and, under the influence of the spring-pressed
plunger 89, enters the notch c as shown inFig. 22,
.iournalled in suitable bearings in the bed Il and
having secured to _its opposite end an arm Hl
(Figs. >ilo and 22). Pivotally connected to the
4arm III lsallnk III guided on the outer side of
to be retracted or raised to its original normal po
the bed 6l on a screw I I'I projecting from said
bed and received in a slot lll in said link. At its
other end the link Iltis formed with a' notch Ile
adapted to be enteredby a ngse |29 on a collar
by a yielding of the bolt 84 toward the left in
as shown in Fig. 22, the nose |20 enters the notch '
this movement causing the button hole cutter 90
sition. The nose 36 is thereupon 'immediately 10' ill secured to the stop bolt l .
When the nose 88 of the stop bolt I4 enters the
engaged by the stop shoulder d, thereby positively
notch c in the cam 31 under the iniluence or the
stopping the machine at the completion oi' the
spring-pressed plunger 89, as -above explained and
final stitch, the stopping impact being cushioned
Fig. 22 against the compression (ä the spring BI. 15 H9. Thereafter, when the stop bolt 84 yields
under the impact of the shoulder d onthe nose
' In accordance with the present invention, a
I6, the link H6 is moved toward the left as viewed
loop deflector such as the deñector 33 in Figs. 9
in Fig. 22, thereby turning the` shaft IM and op
and 10, for instance, is guided in ways in the bed
erating the defiector 33 as described.
65 immediately below the throat plate 34 and be
The above described tying stitch and method
tween the latter and the loopers 32 (Figs. 19 and
21). `>At the completion oi’ the last stitch-form 20 of making the same are not claimed herein, being
covered by the claims of a divisional application
ing cycle, and substantially coincidentally with
Seriaìl No. 553,527, tiled September 11, 1944.
`
the stopping of themachine, said deflector 33 is
I c aim:
moved, by means to be described, from its normal
retracted position shown in Fig. 20 in the direc
tion of the arrow I I0 in said ñgure to deflect, and '
thereby distend, the last loop l which. at this time
is held by one of the loopers 32 and extends from
the work W about said looper to the needle 3| as
, shown in Fig. 21.
25
1. In a. sewing machine, the combination with
a work support, a reciprocatory needle and a `
looper cooperating? therewith in the formation
oi’ chain stitches in material, of a member be
tween said looper and the work support mov
able from adjacent a first thread loop held on:r
The deilection and simultane
ous distention of the loop l_ by the deilector 33 30 said looper toward and beyond the immediately
preceding, spaced thread loop in the material and
results in the setting of the last stitch in the
adapted Aengage and deflect both legs of said
manner previously described and shown in Figs. 3
first loopto distend the same so that said im
and 5. The looper which holds the last loop l
mediately preceding thread loop is drawn toward
also preferably carries a knife or cutter 40’ which
the material and into wedging engagement with
may be like the cutter 40 on the looper 32? in
the legs of said ñrst loop.
Fig. 9 and severs the rear leg of the loop l toward
2. 'I'he combination in a sewing machine as
the end of its distention by the deilector 33. On
set forth in claim l, in which said member has
subsequent removal of the material W from the
a. V~shaped notch to engage and force together
machine and according withdrawal of the sev
ered end of the loop l from the material, the last 40 the diverging legs of said first loop.
stitch is completed, and this stitch is the same as,
and has all the`described characteristics of, the
novel tying stitch shown in Figs. 4 and 6.
The deilector 33 is provided with a socket III
(Fig. 21) to receive a rounded end H2 of an arm
H3 which is fast on one end of a rock shaft III,
3. The combination in a sewing machine as set` .
forth in claim 1, in which said member has a slot
of a width substantially equal to the thickness
of the thread and a V-shaped notch leading into
said slot _and adapted to engage and force the
diverging legs of said first loop into said slot.
'
I
JOSEPH H. PlKUL.
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