close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2410679

код для вставки
Nov. 5, 1946.
Q
J, H, PlKUL
»
SEWING
_
MACHINE
Filed‘ Feb. 5, 1944
i 4.
23,410,679 ‘
'
'
’
a Sheets-Sheet 1
NbvQ5, 1946.
'
J_ H_ plKuL '
' 2,410,679
SEWING MACHINE
Filed Feb. 5, 1944
'
\
8 Sheets-Sheet 2
Nov. 5, 1946,.
2,410,679
J. H. PlKUL
SEWING MACHINE
Filed Feb. 3, 1944
8 Sheets-Sheet 5
SQ:.
.5
k“..
Jaw4|.‘l
%Q3.
In»
Nov. 5, 1946.
'
J, H, PIKUL
SEWING MACHINE
Filed Feb. 5, 1944
2,410,679
I
8 Sheets-Shed 4
Nov. 5, 1946.
J. H. PIKUL
2,410,679
SEWING MACHINE
Filed Feb. 3, 1944
8 Sheets-Sheet 5
INYENJFURI
W RFPJM
Nov. 5, 1946.
J_ H. plKuL ‘
-
-
2,410,679
SEWING MACHINE‘
Filed Feb. 3, 1944
'
s Sheets-‘Sheet 6
T1519
v” 11525
Til Q15,
I311J- L915
'
.
INVEQ§1+EJ RI
2a
‘
‘
1
-
a
Z
>
‘
'
Z
_
\
11y,
'
New‘) cw». 46PM
Nov. 5; 1946, Q ‘
- J. H. PIKUL
2,410,679
SEWING MACHINE
Filed Feb: 3, 1944
8 Shéets-Sheet 7
Nov. 51,‘ 1946.
J. H. PIKUL
_
2,410,679
SEWING MACHINE
Filed Feb. 5, 1944 ’
'
8 Sheets-Sheet 8
INVIiN+URZ
I
Patented Nov. 5, 1946
UNITED STATES PATENT QFFICE
2,410,679
SEWING MACHINE
Joseph H. Pikul, West Newton, Mass, assignor
to The Reece Corporation, a corporation of
'Maine
Application February 3, 1944, Serial No. 520,836
9 Claims.
(01. 112-159)
1
2
This invention relates to sewing machines and
more particularly to machines employing a pair
of loopers for the formation of a group of stitches.
Machines of this general type are described, for
example, in my prior Patent No. 2,131,387, dated
September 27, 1938, and in the patent to Avis,
ent invention to provide in a two-looper ma
chine for the transfer of ‘a needle thread loop,
No. 2,158,171, dated May 16, 1939.
from the looper which seized it, to theother loop
er for positioning said loop for entry by the needle
on its next descent, thereby not only entailing
fewer changes in the cooperation "of ‘both loop
The machines described in the above patents
ers than were heretofore necessary for the for
mation of two types of stitches (attaching and
are adapted to attach buttons having perforations
tying stitches), butalso advantageously adapting
or holes through which stitches are formed, and 10 the two loopers to other types of sewing ‘for which
the two loopers in each of these machines are
they were heretofore unsuitable.
together oscillated and normally cooperate alter
It is a more speci?c object of the present in
nately with a reciprocating needle in the forma~
vention to provide, in both of the prior art ma
tion of successive attaching stitches through a
chines referred to, for the transfer of a needle
pair of holes in a button, said loopers coopera - 15 thread loop from the looper which seized it to
ing respectively with the needle on alternate ree
ciprocations of the latter through the spaced
holes. During the normal operation of the loop
the other looper, so as to obviate any special loop
deflecting means and/or any motion of a spread
er-controlling cam plate, for the formation ‘of a
ers in the formation of attaching stitches, one or
tying stitch.
'
'
the other of the loopers seizes each thread loop 20 The invention Will best be understood from the
cast by the needle on its ascent after descending
following description of an illustrative embodi
through one hole in the button, and de?ects and
ment thereof shown in the accompanying draw
positions the same loop for entry by the needle
ings, in which:
on its next descent through the other hole in the
Fig. 1 is a longitudinal section through a sew
button. In the formation of a tying stitch, after 25 ing machine embodying the present invention.
the formation of‘ a group of attaching stitches,
Fig. 2 is a plan View of certain needle-operating
the needle is conventionally passed twice through
mechanism of themachine.
the same ‘hole in the button, and when this oc
curs the normal operation of the loopers would
Fig. 3 is a fragmentary plan view, partly in
section, ‘of certain looper-op'erating mechanism of
the machine.
cause one looper to seize and deflect a thread
‘
loop cast by the needle after its ?rst passage
through said hole and prior to its second descent
Fig. 3a is a fragmentary section taken on the
line 3a—3a of Fig. 1.
through the same hole, so that such loop would
Fig. 3b is a fragmentary section taken on the
obviously be de?ected out of the path of the
line 3be-3b of Fig. 1.
needle and, hence, would not be entered by the 35 Fig. 3c is a fragmentary section through the
latter on its second reciprocation. In order that
stop mechanism of the machine substantially
this same loop will, however, be entered by the
along the line .'ic—3c of Fig. 32).
needle on its second and final reciprocation in
Fig. 311 is a section similar to Fig, 3c, showing
the formation of the tying stitch, either the looper
the stop mechanism in a different position of op
oscillation is reversed after seizure of the loop
eration.
to bring the latter into the path of the needle
Fig. 4 is a front elevation of the same loopere
on its following descent, and special means are
operating mechanism, drawn to a larger scale.
brought into play to position said loop for re
Fig. ‘la is a view similar to Fig. 4 showing cer
ception of the needle, as is the case in the ma
tain operating elements in a different relative
chine described in my prior patent mentioned, ’ cooperative position, however.
or an irregular oscillation is imparted to the loop
Fig. 41) illustrates in an exaggerated manner
ers so that the other looper will seize said loop,
the development of one of the cam grooves in
as is the case in the machine described in the
Avis patent mentioned. Also, in each of the ma
chines described in the aforementioned patents,
a cam plate, controlling the opening and closing
of loop spreaders associated with the loopers, has
to be specially moved in the formation of a tying
stitch.
It is the primary aim and object of the pres 55
the main cam of the machine.
Fig. 5 is a section taken on the ‘line 5——~5 of
Fig. 1.
Fig. 6 is an enlarged, fragmentary top View
of the throat plate of the machine, carrying cer
tain loop-arrester plates on its bottom side.
Fig. 6a is a section taken on the line {id-5a ‘of
Fig. 6.
2,410,679
-
4
3
alternately through the holes a and b of the
Fig.6.
button B, by mechanism comprising a link 33 (see
also Fig. 2) having a pin or stud 34 projecting
Figs. 8 to 14, inclusive, are fragmentary front
downwardly into a longitudinally disposed Way
elevations, partly in section, of the stitch-form
35 in the upper face of the carrier 25. An up
ing mechanism of the machine, showing progres
wardly projecting portion of the pin 34 is re
sive steps in the operation of the same.
Fig. 14a perspectively illustrates the last step
ceived in a way 35 in a head 31, having a shank
in the formation of a tying stitch.
38 mounted in a bracket 39| in the machine head
||.. The way 3.6 extends transversely to the
Figs. 15 and 16 are enlarged sections taken on
the lines I5—|5 and |6—l6, respectively, of Figs. 10 carrier 25 and longitudinally to the link 33 as
10 and 12, respectively.
shown in dot-and-dash lines in Fig. 2. The op
Fig. 17 perspectively illustrates the function of
posite end of the link 33 is provided with a stud
the loop-arrester plates shown in Figs. 6 and 7.
39 which is adjustably positioned in an arcuate
Fig. 18 is a plan view of a two-hole button at
slot 40 in one arm of a lever 4|, secured to an
tached to work by the present machine. upright shaft 42 which is suitably journalled in
the machine frame. Adjustment of the stud 39
Figs. 19, 20 and 21 illustrate several conditions
of a freely suspended thread loop.
in the slot 40 determines the amplitude of the
Figs. 22 and 23 illustrate another example of
lateral movements or oscillations of the needle
sewing work which may advantageously be per
in accordance with the spacing of the holes a
formed by a machine embodying the present in 20 and b in the button. At its opposite end the
vention.
lever 4| carries a follower 43 which cooperates
Fig. 7 is a section taken on the line '|—‘| of
Figs. 24 to 32, inclusive, illustrate progressive
operative steps of stitch-forming mechanisms in
performing the sewing work illustrated in Figs.
with a cam groove 45 in the upper face of a
main cam 46, fast on a vertical cam shaft 41
which is driven from the shaft 29 by worm gear
22 and 23.
The present invention, having ?rst been ap
plied advantageously in a button sewing ma
chine, will now be described in connection with
such a machine. Having particular reference
to Fig. 1 in the accompanying drawings, the
ing as shown in Fig. 2.
frame of the machine comprises a bed I 0, an
overhanging head II, and a neck i2 joining the
two. The bed l0 carries a work plate I3 upon
which the fabric W, to which a button B is to
so formed that, during each complete revolution
of the cam 46, one group of stitches (attaching
stitches followed by a tying stitch) will be pro
duced.
Rotation of the cam
45 with-the cam groove 45 will cause the lever
M to swing about the axis of the shaft 42, and
this swinging movement of the lever M will be
transmitted to the carrier 25 through the inter—
mediation of the link 33.
The cam groove 45 is
be attached, is supported. Button-holding and 35
The main cam 46 is also provided with a cam
work-clamping means is generally indicated at
groove 49 which, ' through linkage to be de
A.
scribed hereinafter, controls the operation of
The stitch-forming instrumentalities include
the looper mechanism 22 so that the same oper
an eye-pointed needle 20,'_carried by a needle
ates in timed relation with the needle Zlhboth
bar 2| which is mounted for vertical or longi 40 with respect to stitch-forming and with respect
tudinal reciprocation in the head H, and an 1 to lateral movements during a sewing operation.
underneath looper mechanism 22.
'
The looper mechanism 22 comprises a looper
The needle bar 2| is guided at its lower end
block 50 (Figs. 1 and 4), clamped at 51 to a
in a bearing 23, mounted by means of a uni
looper shaft 52 which is iournalled in sleeves 53
versal joint 24 on the front end of a carrier 45 and 54 that are, in turn, journalled in bearings
member 25 which is itself mounted, as herein- »
after described, for _movement in a horizontal
plane both laterally and longitudinally of the
machine frame. The needle bar 2| is guided at
its upper end in a bearing 26, mounted by means
of a universal joint 2'! in the head II.
The nee
dle bar 2| is reciprocated in its bearings 23 and
26 through suitable connections, generally in
dicated at 28, from a shaft 29 which is suitably
journalled in the head H and to which power
is applied under the control of suitable stop
mechanism described hereinafter.
In attaching a button B to work W (Fig. 18),
the carrier 25 is oscillated laterally during suc
55 and 56, respectively, provided by the machine
frame.
The looper block 52 carries a pair of
loopers 57 and 58 and cooperating loop spread
ers 59 and 58 (see also Fig. 15). The loop
spreaders 59 and 60 are pivotally mounted at BI
and 62 respectively, in the looper block 53 and
are provided with tails or followers 63 and 64,
respectively, which cooperate with a cam plate
65. The cam plate 65 is ?rmly mounted on the
sleeve 53 (Fig. 1). The upwardly bent ends of
a suitably mounted torsion spring 56 on the loop
er block 50 engage the loop spreaders 59 and 68
in the manner shown in Figs. 10 and 15, and
normally urge them into closing engagement
cessive descents of the needle 28, except during 60 with their respective loopers 5i and 58, while
the last two descents of the same, so that the
leaf springs 61 and 68 normally prevent axial
needle will pass alternately through the holes
removal of the loop spreaders 59 and 63 from
a and b in the button to form a series of attach
ing stitches s through said holes, and then twice
through the same hole in the button to form a
tying stitch.
the looper block 56. The looper shaft 5| is pro
vided intermediate its ends with an annular re
cess 69, receiving a parted collar 'a'IJ which, to—
gether with the looper block 50, prevent axial
movement of the sleeve 53 relative to the looper
The carrier member 25 for the lower needle
bar guide 23. is longitudially slidable in a guide
shaft 52. A nut 'II on one end of the other sleeve
groove in a head 30, having a shank 3| pivoted
54 retains an annular shoulder 12‘ thereof in
at 32 in the head I I of the machine. The carrier 70 engagement with the bearing 56, thus preventing
25 is, therefore, free to move longitudinally in
axial movement of said sleeve. Journalled on
the head 39 or to oscillate laterally with said
the. looper shaft 52 is another sleeve 73 which
head about the pivot axis of the latter.
is held axially immovable thereon by means of
The carrier 25 is oscillated about the pivot
a collar 13' which is clamped to the looper shaft
axis of the head 30 to cause the needle to pass _ and straddled at 14 by said sleeve in the manner
P254105679
shown in 'Fig. 3 to permit oscillation of the
collar ‘I3’ with the looper shaft 52 without im
jparting such oscillation to the sleeve v‘l3. The
sleeve 13 carries a pin 15 which is received in a
socket '16, depending from a throat plate Fl?!
which is guided for movement longitudinally, or
fore and aft, of the machine in guideways pro
vided by the top of the machine bed It. In thus
connecting the throat plate ‘IT with the sleeve 73,
the latter is held against rotation with the‘ looper
shaft 52. The sleeve 13 is also provided with
an annularly recessed portion '18 which extends
over the parted collary'lll and holds the same in
place. The recessed portion v7:8 of [the sleeve .13
receives two opposite set screws 19 and 8% (Fig.
5) which engage machined shoulders 8i and $32,
respectively, on the sleeve 53. Hence, the sleeve
53 and the cam ‘plate 55 thereon are also held
.against rotation with the looper shaft 52, and
may be angularly adjusted on the latter by .rna
nipulating the set screws 19 and 80.
Clamped at 83 to the looper shaft 52 is one
member 84 of a slider coupling, the other, co
operating member 85 of which is provided by the
adjacent end of the sleeve '54 (Figs. 1 and 3).
The sleeve Ed is provided with spaced lateral arms
86 (Figs. 3 and 4) which are connected by a link
81 with one end of a rocker 88, pivotally mount
ed at 89 to the machine ‘frame and carrying a
together with‘ the carrier 25, the sleeve 1:3?18'0011
'nected by a stud .95 (with a ‘link '96 (Fig. 1) , :form
.ingipartqof alin-kage (not shown) which is *driv
ingly connected with the linkage above-men
tioned that shifts the carrier ‘25 fore and :aft of
the-machine._ Inasmuch as the sleeves 53 and 13
are held axially immovable on the looper shaft
52, the cam plate 65 and the throat plate ‘H are
moved axially with the looper shaft .52 and the
looper mechanism 22. The coupling member :84,
being axially immovable on the looper shaft 52,
moves axially with the latter relative to the other
coupling member 85 without relinquishing its
driving connection with the latter at any time.
The machine is driven from any suitable power
source through belt I50 which passes over a :belt
pulley'I5I on the shaft.29 (Fig. 1). The belt
pulley I5I is loose onthe shaft 29 and is adapted
to be drivingly connected therewith by a com
bined clutch and stop mechanism which, as here
in shown, is similar to that shown and described
vin the patent to vReece et al. No. 2,134,417, Octo
ber 25, 1938. Referring to Figs. 1, 3b and 30,
said mechanism includes a ring I52 carried by
the pulley I5I and having a pin 1.53 which pro
jects through a slot I54 in said pulley and is en—
gaged by a spring I55, located in a recess in-said
cessiye .descents of the needle 2.8 to cause they -
pulley, whereby said ring is permitted .a limited
yielding angular movement with respect to .the
pulley in order to cushion the shock of starting.
The ring I52 has a shoulder I58 (Figs. 3c and 3d)
adapted to be engaged, by a clutch clog I51, piv
oted at I58 to a hub I59 (Fig. 3b) which is keyed
to the ‘shaft 29 and normally urged into engage
ment with said shoulder by a spring I60 connect
ing said dog with an arm is! ?xed to said hub.
The dog I5‘? is formed with a stop ?nger I62
adapted, when the connected parts are rotated
in the'direction of the arrow in Fig. 30, to en
gage and depress laterally extending head I630;
latter to pass alternately through one pair of
holes in the button so as to form, in conjunction
of a rod i63, slidable in a stop arm I64, when the
latter is in the position shown in Figs. 3c and 3d
with the looper mechanism 22, a groupof stitches
through said one pair of holes, whereupon the
and also in dot-and-dash lines in Fig. 1,, thereby
disengaging the dog i577 from the shoulder I 56
follower 90 which cooperates with the previously
mentioned cam groove 49 in the main cam '46.
The cam groove vll!) is designed to impart to the
looper shaft 52 and the looper block 59 thereon
the oscillations requisite in the formation ‘of a
group of (attaching and tying) stitches through -
a pairof holes in abutton.
The present machine is also adapted to sew on
four-hole buttons} To this end, the \carrier '25
and the looper shaft 52 are oscillated during suc
carrier '25 and the looper shaft .52 ‘are shifted lon i ' as shown in Fig. .312 and stopping the rotation of
gitudinally, or in a direction fore and aft, .of the
the shaft '29. A spring urged plunger IBM in
machine, to bring the needle and the looper mech
the stop arm I86 bears against the head ii?ta of >
anism into position to form another group of
the rod IE3 and cushions the impact between said
stitches through the other pair .of holes .in the
head W341 and the clutch dog t5‘? when the. clutch
button. In order to shift the carrier 25 fore and
is disengaged. A pin iiilib on the spring-urged
aft of the machine, for the purpose of transfer
plunger “54a projects into an elongated slot I640
ring the operation of the stitch-forming mech
in the stop arm I84 to limit the outward move
anism from one pair of holes in a four hole but
ment of said plunger lt-‘la. Upward movement
of the rod I63 beyond the position shown in full
lines in Fig. 1 is prevented by a cross-pin I532)
in said rod which engages the stop arm in the
ton to the other pair .of holes .therein at the
\end of a complete revolution of the main cam .25,
a linkage (not shown) is provided which, under
the control of the main cam 46, shifts the car
rier 25 longitudinally of the machine at the
proper time. This linkage may ‘be of the same
construction as that shown and described in the
copending application of Franklin A.Reece,.Serial
‘No. 486,187, ?led May 8, .1943 and the ,same is
manner shown in Fig. 1.
Recoil of the shaft 29
under the influence of the spring-urged plunger
i Eta is prevented by means not shown herein but
fully disclosed in said patent to Reece et al. No.
2,134,417.
-
'
The stop arm led is ?rmly mounted on a rock
adjustable so that the extentof the longitudinal
shaft I 55, journalled in a bracket E65 in the
movement of the carrier 25 may vbe .adjusted to
neck I2 of the machine and having secured there
varying spacing of the two pairs of holes .in a 65 to at the outside of the machine frame an arm
- four-hole button, and also adjustable .so that no
I51 (Fig. 3a) connected by a chain E68 with a
longitudinal movement whatever is imparted to
suitable treadle (not shown) , said arm being pref~
the carrier 25 at the end of a complete revolution
erably provided with a spring-pressed position
of the main .cam 36 in the case of a two-holebut
ing plunger iii!) adapted to register with either
ton. It may further be mentioned that this link 70 one of two spaced depressions (one being shown
age does not at all interfere with the lateral os
at lit in Fig. 3a) in the outer wall of the ma
cillation of the carrier 25 under the control of
chine frame, thereby releasably retaining the stop
the cam groove 45 in the cam 46.
arm I513 in either of the two positions shown in
In order to shift the looper shaft 52 with the
Fig. 1. To start the machine, the treadleis .de-~
looper mechanism 22 fore and aft of the machine 75 pressed, thereby rocking the shaft .1165 so as to
2,410,679
7
move “the stop arm I64 into the full-line position
entry by the same on its
spectively.
shown in Fig. 1. The machine having been
‘started will continue to operate until automati
cally stopped. For this purpose, the. following
mechanism is provided.
'
following descents, re_—
The entry by the needle 20 of the last thread
loop 1K in the formation of a, group of attaching
(7K
Firmly mounted on the inner end of the rock
stitches through the holes a and b in the button B
is illustrated in Fig. 8. During the formation of
these attaching stitches, the loopers 51, 58 and
their respective loop spreaders perform their nor
bearing I14 in the machine frame and having a
mal function, the looper 51 and loop spreader 59
bevelled end I15, adapted to be engaged by a 10 seizing and spreading all loops cast by the needle
on ascending through the hole a in the button
stud I16 which projects from the underside of
and de?ecting them into the path of the needle
the main cam 46 when the latter reaches an
for entry by the same on descending through the
angular position corresponding to the comple
hole b in the button, and the looper 58 and loop
tion of one group of stitches (attaching stitches
spreader 50 seizing and spreading all loops cast
followed by a tying stitch). Such engagement
by the needle on ascending through the hole I)
of thebevelled end I15 of the hunter I12 by the
in the button and de?ecting them into the path
stud I16 causes said bunter to be forced toward
of the needle for entry by the same on descend
the right in Figs. 1 and 3a, thereby rocking the
ing through the hole a in the button. During
shaft I65 clockwise as viewed in Fig. 1 and mov
continued descent of the needle into the last
ing the stop arm I64 into the dot-and-dash line
thread loop lX in the formation of a group of
position in Fig. 1 to disengage the clutch and stop
attaching stitches from the position shown in
the machine. The stud I16 is preferably notched
Fig. 8 into the lowermost position shown in
at I11 (Fig. 3a) so that the slight over travel
Fig. 9, the looper block 50 is, under the control of
of the parts incidental to stopping the machine
will bring said notch opposite the end of the 25 the portion 49a (Fig. 4b) of the cam groove 49
shaft IE5 is an arm H! to which is pivoted a
hunter I12, resting on a stud [13 in a suitable
hunter I12 in order to permit the machine to be
again started by operation of the treadle.
‘ As shown in Fig. 1, the stud I13, which is man
ually turnable, is flattened at its end as at I18.
In the angular position shown in Fig. l, the
hunter I12 rests on the periphery of the stud
I13 and is thereby held in the path of movement
of the stud I16 on the main cam 46. Hence, in
this angular position of the stud I13 the machine
will be stopped at the completion of each single
group of stitches, i. e. after each complete revo»
lution of the main cam 45. However, if it is
desired to have the machine stopped at the com~
pletion of two groups of stitches, as in sewing on 40
a four-hole button, for instance, the operator of
the machine, before starting the same, turns the
stud I13 so that the hunter E12 comes to rest
on the ?at end I18 of said stud and is accord
ingly lowered below the path of movement of the
stud I16 on the main cam. Hence, the stud £15
will not engage the bunter I12 after the ?rst
complete revolution of the main cam 46, and the
stop arm is not shifted into the clutch-disengag~
ing position shown in dot-and-dash lines in Fig. 50
1, with the result that the main cam 45 will
continue its rotation beyond the ?rst revolution.
To stopthe machine at the completion of the
second revolution of the main cam 45, means, not
shown herein but fully disclosed in said patent
to Reece et al., No. 2,134,1i1'l', are provided which
automatically rock the lowered bunter I12 into
the position shown in Fig. 1 during the second
in the main cam 46, rocked into the position
shown in- Fig. 9 so as to release from the looper
58 and spreader 60 the loop Zx which is accord
ingly cast about the needle and subsequently
drawn up against the work W by a conventional
take-up (not shown) when the needle clears the
work on its following ascent. On said following
ascent, the needle leaves behind a thread loop le.
_ For forming a tying stitch, the looper block 50
is, in accordance with its normal operation and
under the control of the cam groove portion 49b
in the main cam 46, swung or rocked from the
position shown in Fig. 9 into the position shown
in Fig. 10, so that the looper 51 and loop. spreader
59 seize and spread the loop .la and de?ect the
same as illustrated in Figs. 4a and 10. > However,
on its next and ?nal descent in a sewing cycle
of the machine, the needle, under the control of
the cam groove 45 in the main cam 46, passes
again through the same hole a in the button for
the formation of‘ a tying stitch. In order that
the needle may, on its last descent, enter the
loop I“, the latter is, in accordance with the pres
ent invention, transferred from the looper 51 and
loop spreader 59 to the looper 58 and loop spread
er 60 so that the normal loop-de?ecting func
tion of the latter looper and loop spreader may
be used to bring the loop la into the path of the
descending needle. This transfer of the loop Z“
is illustrated in Figs. 10 to 12 inclusive, the here
inafter described movements of the looper and
loop spreaders, with their carrier‘ block 50, being
produced by a portion 490 of the cam groove 49
revolution of the main cam 45, so that said
(Figs. 4a and 4b). Thus, Fig. 10 shows the loop
bunter will be actuated by the stud I16 and the 60 Za held spread and de?ected by the looper 51 and
machine stopped at the completion of the second
loop spreader 59, while Fig. 11 shows the momen
revolution of the main cam.
tary release of the loop Za from the looper 51 and
The cooperation between the needle 20 and the
loop spreader 59 during an abnormal counter
looper mechanism 22 in the formation of a group
clockwise rocking motion of the looper block 50,
of attaching stitches through a pair of holes in
from the position shown in Fig. 10 into the posi
a button, is fully described in the prior patents
tion shown in Fig. 11, during which motion the
previously mentioned, the needle 20 being re
loop spreader 59 clears the non-rotatable cam
ciprocated and oscillated so as to pass alternately
plate 65 and closes against the looper 51. Dur
through a pair of holes in the button and the
ing continued counter-clockwise rocking motion
looper shaft 52 with the looper mechanism 22
of the looper block 50 from the position shown in
being oscillated relative to the cam plate 65 to
Fig. 11 into that shown in Fig. 12, the looper 58
cause the loopers and their respective loop
and loop spreader 60 enter the reelased loop Z“,
spreaders alternately to seize and spread suc
the loop spreader 60 engaging the non-rotatable
cessive thread loops cast by the needle and de
or stationary cam plate 65 and spreading the loop
flect said loops into the path of the needle for 75 Z“ only after having entered said loop. The loop Z8
v2,4,10,13,79
9
10
I81, journalled in the bracket its. Mcuntedon
thus, brought into the‘ path of the descending
needle and will be, entered by the same in the,
the other end of the stub~ shaft 56;] is a, rocker
fashicnshownin Figs.- 12and. 1,6. During con
tinued descent of; the needle from the position
shown in Fig. 12, the looper block 5!), is rocked
the rod I63. in the stop arm Hill. A Spring I89,
688, adapted to cooperate with the lower end of
actsron the link I85; to maintain, the rocker [.883
in engagement with the rod‘ I63‘. The rod I613,
into,- the position shown, in- Fig. 13, thereby re
leasinsfrqmihe looper 518. and 199p spreader W.
‘the. 19.0.1? I? which is. accordingly cast about the
and Subsequently drawn up. against the
WQI'EhWE by teeters-11c. On its last. ascent a
Sewing Cycle 0? them-aching the needle casts a
lest 1999. lb whiqh is seized, spread and. de?ected
by the looper 5,1 and loop spreader 59 during
when depressed on clutch, disengagement; will:
turn the rocker E88,, and, hence. ,t-he arm‘ I86,
clockwise as viewedin. Fig. 1, and such turning
10 movement of the arm l85will, through intermee
diation of the, link i855, bellrcranlg lever 582' and
pin [3-], cause movement of the cutter l?ilfrom
inoperative position (Fig. 3d) into cuttingposi
tion. ‘The cutter Hit will be retracted intoin:
normal oscillation of theflooper‘ block 53, under '
the control of the portion l39d in the cam groove
operative position when the machine is restarted;
andthe rod IE3 is releasedrfor return to itsv up.
49, from the position- shown in Fig. 13 into that
sho'wn’in Fig." 14. While the loop lb is thus held
perrnost position shown in. full lines, in; Fig. 1;_.
The pin-and-slot connectionlB l._, 1.80. between the.
spread and‘ de?ected were looper 57 and loop
cutter I09 and the bell crank lever I82ris: such
spreader 59, a cutter ltd (Figs. 1 and 3a) is op
erated just when the machine is stopped, so‘ as
to sever'one legof the loop lb as at ltlinFi'g. 14a,
that the cutter ltd may be shifted foreand aft
20
of the machine in sewing on a four-holebutton;
for instance, without. being moved into cutting
thereby. concluding the formation of the con
catenated loops Zx andZa into a knot. The ma
chine. concludes an operating cycle and is stopped
when. the follower 90 on the rocker 83 cooperates
position.
eludes». provision forarresting. the releasedloop
Zav during, itsv transfer from one looper and loop
withthejportion we of the cam groove 49 (Fig.
4b) and the looper block 5%? assumes the posi—
tion shown in Fig. ‘14. The
groove 45 in the
mainjcam lit is so designed that the needle Ed is
laterally shifted the. next time in the next oper- .,
ating cycle of ‘the machine after the ?rst needle
descent, wherefor the ?rstneedle penetration in
the‘ next operating cycle will occur through the
hole -_a (Fig. 14) inthe next button to be sewed
on. Since the looper block til stops in the posi
.
The present invention further, preferably in
spreader to. the other, looper and loop spreader.
A thread loopfreely suspended as the loop Za in
Figs. 1-1 and 19 has, unless spun neutral, a tend
ency. to twist into a. disposition such as that. shown
in Fig. 29, for instance, as. well as curl up or turn
, up, at, its lower endin the fashion shown in Fig.
21. ' To prevent any twisting and, curling of the
thread loop Za for a safe transfer from one. looper
and loop spreader to the other looper and loop
looper 51' and loop spreader 59, in accordance
with’ their normal function, are to seize, spread
spreader, regardless of how the. thread is spun,
there are mounted on the.~bot_tom side of. the.
throatplate ‘l1 twoplates. Hi5 and let (Figs. 1
and 8 to 17) having. notches Hi1, and I08, re
and deflectthe ?rst loop cast by the needle on its
?rst reciprocation through the hole a in the but
ton in the next operating cycle of? the machine,
will be entered‘ by the rear leg of each loop while
tion shown in Fig. 14 when the machine is stopped
at the end of an operating cycle, and since the
the looper block 50 is, after the restart of the
machine, returnedto the position shown in Fig.
13 before the needle 20 descends for the ?rst
time. This is accomplished by a, quick return
portion 499‘ of the cam groove 59. The portion
woof-the cam- groove 49' next-swings the looper »
spectively, in .their adjacent edges. These notches,
[cl-and 508 are so. arranged that the'notch I98 1
the latter. is beingdeflected and spread by either
looper, and cooperating loop spreader (Figs. 15
and 16), and the notch It] will be entered by
the front leg of each loop seized by the looper
5]; and cooperating. loop spreader 59 on being de
flectedpand spread by the same. Hence, when
the loop, is is momentarily freely suspended as
blocleiio back into the position shown in Fig.- 14 to
seize, spread and deflect the ?rst 100p cast by the 50 shown, in Fig. 11, the front leg. :10 thereof ‘passes
through the notch It? and the rear leg y, there
needle, on its?rstreciprocation. Thereafter, and
of passes. through the notch H18 in the manner
until thefollower~9d on the rocker- ildcooperates
best shown. in Fig. 17, thus. positively preventing
any eventual twisting of. the freely suspended
ciprocationotthe needle, whereby the looper 5-‘! 55 loopv 1?, as will be readily understood. The
notches lilg'i and list also restrain the loop la
andzloopspreader» 5'9. seize and spread allloops
with the cam- groove-portionddc, the-cam groove
49~shiftsqthe looper, blocklaterally for each re
castby the. needle on» ascending through the hole
ain. the. button and. de?ect them. into‘ the path
of theneedlefor entry by the. sameon descending
through the. hole bin button, and the. looper, 58 60
and: loop spreader G0; seize and.- spread. all loops
cast by the needle. onascendingthrough the hole
b- in the button and, de?ect them into the path
of theneedlefor entry by the same. on descend
ingthrough the holea in the. button. The cutter
I00 isof the. form shownsinFig. 3a and pivoted. on
the_s.o.cket 1.6: (Fig. 1.) so. as tobe turnable. about
thelatter. and movablefore and. aft. of the ma
su?iciently so that the same willv not curl up inthe
fashion shOWnin Fig. 21. Iii-fact, one of these
plates, preferably the. front plate, N95; with its.
notch Hi1), is sufficient e?ectively ,to prevent
twisting and curling of they freely suspended loop
The plate lil?isprovided at its bottom side adja.—.
cent the notch llllswith arib ! It, (Figs. 6, '7 and
17) which, by. forming a downward continuation
of the, side wallv of the notch I68 engaged by thev
rear leg got the looplas shown in Fig- 6a, assists
said- notch. in counteracting; the, curling tendency
of the loop. The action of the notch l_ll8_ and
rib LID; on the, loop is one, of restraining the rear
chine together with the looper mechanism, The
cutter MB is also. provided with a slot I80, slid 70 leg of; the latter, for quite a distance from the
‘plate l?dagainst turning, upwardly into a posi
ably receiving a pin l8! on a bell cranklever. E82
tion, such as shown in dot-.and-dash lines in Fig.
which is pivoted at I33. to a block ISA. on the
bearing 55 provided-by the bed. lit-of themachine. ' 6a,,for instance, thus leaving only a portion of
The bell crank lever 182‘ is; connected by a link
I85 with an arm I816; on one end ofa stubsh-aft
the. loop to, curl up. to, an insigni?cant, extent.
Thus, by the provision of the notched. plates I05.
2,4103%
11
and I06, or even the provision of only one of
these plates, the described transfer of the loop Za
from one looper and loop spreader to the other
looper and loop spreader is assured, and the
twisting and curling tendencies of the freely sus
pended loop’ are effectively counteracted. Of
course; the loop-arrester plates I05 and IE6 can
be dispensed with if the needle thread is spun
neutral and the stitch-forming mechanism ac
curately timed for the occasion.
a '
'
'It is now apparent that, by transferring the
loop 13 from one looper and‘ cooperating loop
spreader to the other looper and cooperating
loop spreader in the formation of a tying stitch,
the normal loop-seizing, spreading and de?ecting
functions of both loopers and cooperatingloop
- spreaders are utilized, and the cam plate 65 may
ferred transfer'of the loop l3v (Figs. 26, 27 and 2251'
When the Work is fed forwardly into the position
shown in Fig. 28, the transferred loop I3 is drawn
from the notch in'the loop-arrester plate I21 "and
into a forwardly extending portion I39 of the
throat I138 in a stationary throat plate I“ (see
dot-and-dash line position of throat in Fig. 23)
whereby the loop Z3 is de?ected in the manner
shown in Fig. 28 to form an open thread triangle
which the needle may enter on its next descent
through the hole I30 in the tag. After entry of
the needle in the de?ected loop 13, the looper
block I22 is swung from the position shown in
Fig. v28 into that shown in Fig. 29, thereby re
leasing the loop Z3 from the looper I24 and
spreader I28, as Well as seizing the next needle
thread loop 14 with the looper I23 and spreader
I25 and de?ecting the vlatter loop into the path
of the needle for entry by the same on its next de
scent through the hole I3I in the tag. On ascent
through the hole ISI~ in the tag, the needle casts
The described transfer of a thread loop from
the next loop I5 which is seized and deflected by,
one looper and loop spreader to another looper
the looper I24 and spreader I26 on counterclock
and loop spreader, while advantageous in the at
wise oscillation of the looper block I22 as shown
tachment of a button to material, as explained,
in Fig. 36. However, since the needle next de
is also advantageous for other types of sewing
scends through the hole I29 in the tag, the loop
work, for example, in the attachment of a tag I20
15 requires transfer from the looper I24 and
to‘workW' (Fig. 22). The stitch-forming mech
spreader I26 unto the looper I23 and spreader I25
anism employed for the tag attachment may be
in order that said loop may be de?ected into the
like that described in connection with the button
path of the needle on its next descent. Hence,
sewing machine and include a‘ reciprocatory and
before the work W’ is fed rearwardly in the di
oscillatory needle I2 I, an oscillatory looper'block
rection of the arrow in‘ Fig. 32 to bring the hole
I22 with spaced loopers I23, I241 and cooperating
I29 in the tag into alignment with the needle, the
loop spreaders I25, I26, There may also be pro
looper oscillation is reversed in order to accom
vided a loop-arrester plate I2'I of the same con
plish the mentioned transfer of the loop I.5 (Figs.
struction and'function as the plate I06 in Fig. 17.
30, 31 and 32). In this fashion ?ve chain stitches
In. attaching the tag I20 to the work W’, the
s1 to s5 are formed (Figs. 22 and 23) by which the
needle. I2I ‘?rst descends through one hole (I28,
‘tag I28 is attached to the work W’. A tying stitch
for instance) of a series of holes I28 to I3I in
said tag and through the work W’, whereupon’ 4.“, st may ?nally be formed by passing the needle
twice through the hole I 29 in the tag and accord
the looper I23 and loop spreader I25 Will, during
ingly operating the looper mechanism I22.
clockwise oscillation of the looper block I22 as
.I claim:
.
viewed in Fig. 24, seize the thread loop Z1 cast by
the needle and de?ect said loop into the path of
1. In a sewing machine, the combination with
the needle for entry by the same on its following
a work-penetrating needle and two spaced loop
descent through the hole I29 in the tag. On the
ers together movable in opposite directions, of
following retraction of the needle from the hole
means to move said loopers in one of said direc
I29, the looper block I22 reverses its oscillation,
tions to seize with one looper a needle thread loop
thereby releasing the loop Z1 from the looper I23
cast by the needle, and then in the opposite di
and spreader I25 and seizing the next cast needle 50 rection to withdraw said one looper from said
thread loop 22 with the looper I24 and spreader
loop and seize the latter with the other looper.
I26; The loop I1 is in the meantime drawn upv
2. In a sewing machine, the combination with
against the work W’ by suitable take-up mech
a reciprocatory and oscillatory needle and looper
anism (not shown), and the loop Z2 is de?ected in
mechanism including vtwo spaced loop-handling
the fashion shown in Fig. 25. The needle then
devices together movable in opposite directions to
descends through the hole I28 and enters the
seize thread loops cast by the needle in its oscilla
spread and de?ected loop Z2, whereupon the latter
tory end positions, respectively, and de?ect them
is, on clockwise oscillation of the looper block from
into the path of the needle in its other oscillatory
the position shown in Fig‘. 25 into that shown in
end position, of means to move said devices in
Fig. 26, released from the looper I24 and spreader
said opposite directions to cooperate with the os
I26 and drawn upagainst the work. During such
cillating needle in the formation of ?rst stitches=
clockwise oscillation of the looper block 22 and
in work, andyto move said devices once in both.
while the needle. ascends through the hole I28, the
of said oppositedirectionsduring a repeat re-~
looper I23 and spreader I25 seize the next needle
ciprocation of the needle in one of its oscillatory»
thread loop Z3 and de?ect the same in the fashion 65 end positions to cause seizure and de?ection of a,
shown in Fig. 26. However, since the needle next
needle thread loop alternately by said devices and.
descends through the hole I36 in the tag, the loop
its release from the latter between said alternate.
Z3’ requires transfer from the looper I23 and
seizures for the formation of another stitch dif
spreader I25 unto the looper I24 and spreader
ferently disposed than said first stitches.
I26 in order that said loop may be‘ de?ected into
3. In a sewing machine, the combination with:
the path of the needle on its next descent. Hence,
a reciprocatory needle and two spaced loop-han-~
before the work W’ is fed in the direction of the
dling devices together movable in opposite direc
arrow in Fig. 28 to bring the hole I30 in the tag
tions to cause seizure and de?ection of a needle
into alignment with the needle; the looperoscil
thread loop alternately by said devices and its re~
lation is'reve’rsed in order to accomplish'the re
lease'from the latter between said alternate seizs
remain stationary for the formation of the at
taching. stitches as Well asthe terminating tying
stitch formed by the machine during an operat
ing cycle thereof.
2,410,679
13
Y
14
.
ures, of means to hold said released loop for seiz
ure by the next-seizing device.
mechanism including two spaced loop-handling
devices together movable in opposite directions to
4. The combination in a sewing machine as
set forth in claim 3, in which said means com
prises an element having a notch in which one
leg of said released loop is received.
'
5. The combination in a sewing machine as set
position thread loops left behind ‘by the needle in
its oscillatory end positions, respectively, for en
try by the needle in its other oscillatory end posi
tion, as well as mechanism to reciprocate the
needle alternately in its oscillatory end positions a
number of times and then reciprocate the needle
at least twice in the same oscillatory end posi
forth in claim 3, in which said means comprises
an element having a notch into which one leg of
said loop moves on de?ection of the latter by
either device and in which said leg remains while
tion for the formation of chain stitches and a
tying stitch, of mechanism to move said devices
in said opposite directions during successive needle
said loop is released.
reciprocations, respectively, except during the re
6. The combination in a sewing machine as set
peat reciprocation of the needle in the same os
forth in claim 3, in which said means comprises.
an element having a notch into which one leg 15 cillatory end position, and. to move said devices
also in said opposite directions during said re
of said loop moves on de?ection of the latter by
peat needle reciprocation to cause alternate loop
either device, and in which said leg remains while
positioning operations of said devices.
said loop is released whereby any twisting tend
9. In a sewing machine, the combination with
ency of the released loop is counteracted, and a
wall portion of said notch extends beyond the ,
con?nes of the latter and is engaged by said leg
a reciprocatory and oscillatory needle, of two
spaced loopers and cooperating loop spreaders
whereby any curling tendency of the released loop
together movable in opposite directions, a cam
is counteracted. '
immovable in said opposite directions and adapted
to actuate said spreaders, said loopers, spreaders
7. In a sewing machine, the combination with
a reciprocatory and oscillatory needle and looper
and cam being so coordinated that the loopers and
their respective spreaders will, on movement in
said opposite directions, seize and then spread
thread loops cast by the needle in its oscillatory
end positions, respectively, and de?ect them for
mechanism including two spaced loop-handling
devices together movable in opposite directions to
seize thread loops cast by the needle in its oscil
latory end positions, respectively, and de?ect
them into the path of the needle at its other oscil 30
entry by the needle in its other oscillatory end
latory end position, of means to move said devices
position, and means to move said loopers and
in said opposite directions to cooperate with the
oscillating needle in the formation of ?rst stitches
spreaders in said opposite directions to cooperate
with the oscillating needle in the formation of
in work, and to move said devices once in said
opposite directions during a repeat reciprocation ;
?rst stitches, and to move said loopers and spread
of the needle in one of its oscillatory end positions
to cause seizure and de?ection of a needle thread
peat reciprocation of the needle in one of its
ers once in said opposite directions during a re
oscillatory end positions to cause seizure, spread
loop alternately by said devices and its release
and de?ection of a needle thread loop alternately
from the latter between said alternate seizures for
the formation of another stitch differently dis
posed than said ?rst stitches, and means to hold
said released loop for seizure by the next-seizing
device.
8. In a sewing machine, the combination with
by said loopers and cooperating loop spreaders and
a reciprocatory and oscillatory needle and looper
an)
its release from said loopers and spreaders be
tween said alternate seizures for the formation of
another stitch differently disposed than said ?rst
stitches.
Y
JOSEPH H. PIKUL.
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 738 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа