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Патент USA US2128120

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Aug. -23, 1938.
- N. v, cHRlsTl-:NSEN ET A1.
Filed Jan. 25,»1936
$5 Sheets-Sheet lv
Aug. 23,' 1938.
N. v. cHRlsTENsl-:N ET A1. '
Filed Jàn. 25, _ 19:56
:5 sheets-sheet 2
Aug. 23, 1938.
Filed Jan. 25, 1956
l3 Sheets-Sheet 5
Patented Aug. 23, 1938
Norman V. Christensen. and Charles F. Rubel,
Chicago, Ill.. minors to Union Special
y Machine Company, Chicago, Ill., a corporation
of Illinois
Application .Imam z5, 193s, serial No. V60,764
'z claims.y (ci. 11e-_197)
- This invention relates to sewing machines; and
it `has reference more particularly to a. chain
„ stitch sewing machine of the type wherein the
rotary main or driving shafts from which the
'5' needle, looper and i’eed mechanisms all derive
their movements are journaled in horizontal arms
` overhanglng ilat oblong bed plates or work sup
ports. Such machines are extensivelyused in
the manufacture of bags of burlap, canvas> and
10 >the like as well as in other connections.
The aim of our invention is to enable operation
of sewing machines of the type specifically re
Ierred to at higher speeds than possible hereto
fore, with a view toward obtaining increased
u production from them.
This objective we realize in Practice, as here
inafter more fully described, by utilizing light
rotary parts to the utmost extent, and translat
ing the rotary motion of such parts into recipro
in a copending patent application Serial No.
58,672 filed on Jan. 1_1, 1936, by Norman V.
Christensen, one vof the present applicants, may
be used. ’Journaled in bearing bushings 5 and 6
set into the hollow of the overhanglng arm 3 is 5
the main or drive shaft 1 of the machine, the
rear end of said’ shaft extending through the
bearing 6 to the exterior where it is provided
with a combined hand and belt wheel 8 so that
the machine may be operated either manually or 10
by power. As shown, the bearings 5 and 6` have
oil ports 9 and I0 which'respectively register with
vertical oil ducts il and i2 accessible at the top
of the overhanging arm 3.
Guided i’or vertical
reciprocation inupper and lower bushings y|3’and 15
it set into the head t, is a vertical bar i5 which
carries the needle it., Up and down movements
are imparted to the needle bar ib by means which
includes a dynamically-balanced cranlr member .
i'i whereof the cranlr pin it is coupled, by means 20
of a link it, with a pin it projecting rearward
feed elements, etc.) which require reciprocation from a split collar il which is secured to said
through provision of correspondingly iight, struc- . needle bar near the top within the hollow of the
turally-reñned intermediate connections which head t, by a” clamp screw il. The projecting end
25 are dynamically balanced and smooth in'- their of the pin 2t is ñattened as at il to engage a 25
Y20 catory motion at points or regions local to those
elements (e. g. the needle, looper or loopers,
‘action so that noise, vibration and wear are re-, ` vertical guideway it within the hollow head t,
and is thereby steadied in its movements. Free
to rotateon the pin id is a ball it which engages
appear :from the following detailed description the spherical cavity oi a split bearing boss il
30 of the attached drawings, wherein Fig. I is a . at the lower end oi the linlr iii. The cap piece 3o
longitudinal sectional view of a top rotary shalt it oi the bearing boss il is formed with a scoop
ñat bed sewing machine conveniently ems 2d which dips up lubricating oil from a small
well tu in the bottom oi the head t and conducts
our invention'.
it to the surface of the bali it, aportion oi such
Fig. il is a view of the machine in end eleva
@ther objects and attendant advantages will
35 tion looking from the lei't of Fig. I.
oil ñnding -its way to the pin it by way oi one or ' Y:
' «'
Fig. m show's'the needle arm oi? the machine
in plan; and
more radial ducts ti in said ball. 'lfhe described
construction oi the link it constitutes one of the
Fig. il! is a plan sectional viewol the machine features of the present invention and is advan- y
taken as indicated by the arrows IV--IV in Fia. l. tageous in that said link and its connections are
As herein illustrated, the irame ol our improved "rendered sell-aligning, Seli-onlne and smooth ,
sewing machine comprises a nat horisontal ob acting, with preclusion oi binding and heating
longbed plate or work support i, with an inte oi the end bearings of said linis when the machine
grally formed hollow standard 2 opstanding from
one end thereof and sustaini
a hollow over
45 hanging arm i above said work support, said arm
terminating at its free end in a head il. The
machine is primarily designed lor mounting- upon
the top oi au operetor’s table T (Fig. l) with the
bed plate or worl: support l suhstantially hush,
g, and the parts ndant therefrom projecting down
through an opening Q in the table. in instances
where it is desirable to have the bed plate i
elevated, or when the machine is to be sustained
on a narrow plank or beam as in bag factories,
g, a mounting or base such as shown and described
is operated at high speeds. if there should be
any tendency oi either one oi the bearing surfaces
oi the ball it to sticls, the other oi said surfaces
uwill obviously continue to function as a pivot.
. The vertical presser bar di of the machine is
guided near the bottom in a
dant bearing
projection dit oi the head d, and is held against
rotation through engagement oi the lateral pro- r
¿lection Bil of a collar it thereon, in a vertical
guide tt at one side of said head. The upper
end oi the presser bar t2 is conñned to slide in
a screw bushing 37 threaded into the upper part
oi the bead il,-said bushing bei
slotted as'at 33. The presser bar 32 is acted
upon by a double leaf spring 39, of which the
forward end extends through" an opening ¿i0 in
the back of the head Ll (Fig. III) and into the
slot 38 of the bushing 3l to engage the rounded
top of said bar, seev Fig. II.
The rear end of
pendant bearing lugs l0, "il of the work support
i, and, in `eñect, is a coaxial continuation of
the transmission shaft 50. .incident to assem
bling the >machine7 the collar 58 and the bush
ing 5| are mounted on theshaft 50 and the right
hand end of the latter is inserted- through the
the spring 33 is apertured as shown in Fig. III
bearing boss ‘l2 on the oil sump 53, whereupon
to engage an anchorage stud „projection ¿il on
said bushing is pushed into place and secured by
the overhanging arm 3. The pressure of the
spring 39 is regulatable by a set screw ¿l2 thread
ed in a bracket lug d3 at the top of the arm 3;
the set screw shown at W3, see Fig. I. The con
struction of the lower shaft of the machine from
the two parts 50 and £53 as shown and described
is advantageous in that it facilitates assembling
of the machine, and also in that it aüords a
separable crank ä'l at the juncture between said
Cooperating with the needle i5 beneath the
Work support i of the machine, is a looper 'M
which is carried by a vertical arm 'l5 fulcrumed
on a stud ‘i6 projecting from the looper rocker
lll which is secured by set screws “i8 to a rock 20
shaft ’i9 having its ends journaled in bushings
and a jam nut iid functions as a means for hold
ing the set screw in adjusted positions. Due to
the influence of the leaf spring 39 upon the bar
32, the presser foot ¿l5 at the lower end of the
latter is maintained in yielding engagement with
the fabric being sewed in the machine.
In order that the presser foot |55 may be raised
clear of the work support i when desired or
20 required, a lifting latch lever 08 is provided, said
lever being fulcrumed to swing about a screw
dl engaged in the front of the head él, and hav
ing a cam surface ¿38 to coact with a stud pro
jection H9 on the collar 35 aiìxed to the presser
25 bar 32, see Fig. II.
Extending longitudinally of the machine be
neath the work support l in parallel relation with
80 and 8i respectively set into the bearing lugs
l@ and "il, rI‘he shaft 39 is rocked through the
medium of an arm 82 clamped thereto and con
nected to the strap 83 of an eccentric 34 on the 25
supplemental shaft 68, see Figs. I and IV, with
resultant impartation to the looper of its needle
the main shaft 'i is a transmission shaft 50, -avoiding movements. The holder or carrier 'l5
which, at its rear end, is journaled in a bushing for the looper il is oscillated about the fulcrum
30 5| set into the front wall 52 of a lubricant sump 'i6 -in the performance of its loop taking func
53 integrally formed with, and depending from
said work support. As shown in Fig. I, the lubri
cant sump 53 is in direct communication with
the hollow of the standard 2, and closed at the
35 bottom by a removable plate 55. The shaft 50,
it will be noted, extends into the lubricant sump
53 and to its end is secured a helical gear pinion
56, the hub 51 of which abuts one end vof the
bearing bushing 5| while a collar 58 abuts against
40 the other end of said bushing to hold said shaft
from shifting endwise. The gear pinion 56 is
tions through a horizontal link 85 which _has split
bearings 86 and 81 at its opposite ends respec
driven, through an intermeshing idler gear wheel
ball end 98 and which is coupled with the crank
pin 61 on the transmission shaft 50, by a link
59, from a helical gear pinion 60 secured on the
main shaft 1 directly adjacent the bearing 6 of
45 the latter.y The idler gear 59' is free to rotate
on a fixed transverse shaft 6| within the hollow
of the standard 2, and the thrust thereof in
opposite _directions is opposed by collars 62 and
63 on said shaft 6| abutting opposite faces of
50 the hub 64 of said gear wheel.
The gear train
56, 59 and 60 is lubricated through splash oil
carried up from a supply within the sump 53. In
practice, the idler gear 59 is made from suitable
sound and wear absorbing material, and is pref
55 erably so proportioned with respect to the pin
ions 56 and 60 that theA points of contact thereof
with the latter gears constantly change with re
sultant uniform distribution of the Wear. The
communication of motion from the upper or
main shaft 'l to the lower or transmission shaft
50 is thus effected smoothly, positively and noise
' lessly. The gear drive herein`> shown and de
scribed is the same in principle and operation as
that disclosed in applicants’ copending -applica
65 tion Serial No. 670,186 filed on May 9, 1933.
At its left hand end (Figs. I and IV), the
transmission shaft 50 is integrally formed with
a pair of spaced crank heads 65, 66 with a con
necting ball crank pin 61, from which the looper
70 mechanism of the machine receives its move
ments as >will be presently explained.- The ter
minal head 65 has a socket to receive the con
tiguous end of a supplemental shaft 68 which is
made fast by screws 69. As shown in Fig. IV.
tively engaging a ball stud 88 on said 4carrier 'l5
and a similar ball stud 89 on an arm 90 extend
ing upward from an oscillating sleeve 9|. As
shown, this sleeve 9| is aiiixed to a transverse
rock shaft 92 whereof the ends are journaled in
bearing »bushings 93. 94 set into spaced lateral
projections 95, 96 of the bearing lug 'il herein
before referred to. The oscillating sleeve 9| also
has a horizontal arm 91 which terminates in a
99 also formed with split bearing ends |00, |0|,.
to respectively engage said ball and the crank
pin. By employing balanced parts with ball
‘joints in the looper mechanism just described,
and through provision of the crank pin 61 in
lieu of an eccentric such as is ordinarily used in
machines of this type, friction and wear is re
duced to a minimum so that the movement of
the mechanism is rendered smooth and easy and
The means provided for progressively advanc
ing the fabric in the machineincludes a feed dog
|02 which, as shown in Fig. II, is secured, with
capacity for vertical adjustment, to a feed bar
|03 `by means of a screw |04. Fixed in a boss
|05 at the rear end of the feed bar |03, is a trans-l
verse pin |06 whereof the ends engage spaced
bearing bosses |01, |08 of a yoked rocker |09,
which, in turn, is secured to a rock shaft ||0
whereof-the ends are jo‘urnaled‘respectively’iîf
the bearing ||| of the lug 10 and another bear
ing lug ||2 pendant from the work support |,
said rock shaft being held against shifting axially
by collars ||3, Ill thereon'which respectively
abut the lugs | I | and- ||2 at their inner sides, see
Fig. IV. Secured to the outer end of the rock
shaft ||0, preferably by welding, isa horizontal C
arm ||5 which reaches forwardly and which atv
.its outer end' has pivotal connection at ||6 with
the lower end of a vertical link ||1 whereof the
upper end` is split to clamp a bushing ||8 engag
75 the supplemental shaft 68 is journaled in spaced Y ing a crank pin ||9 on a crank disk'l20 amxed 75
to the outer end of the supplemental shaft 00.
Thus,- during the rotation of the supplemental
shaft 68 back and forth feed movements are in
duced in the feed dog |02.» 'I'he pin |i0 is ra
dially adjustable on the crank disk |20 so that
the feed stroke of the dog |02 can be varied.
The lift movements are imparted to the feed dog
|02 by ¿means of an eccentric |2| on the supple
mental shaft 6B, the strap |22 of which is pivot
10 ally connected at |23 to the downwardly and
.forwardly curved arm projection Wt of the feed
bar |03, see Fig. II. The feed mechanism just
described isv generally similar to that featured
in U. S. Patent No. 1,817,727 to Wohlpart, and,
is hereinafter claimed only in combination with
the' other
»and cooperating mecha
nisms of the machine. It is to be particularly
noted however that in the present instance, the
feed rocker shaft lit passes through a hearing in
20 the lug iii disposed between the feed rocker itt
and the arm H5. This arrangement is advan
tageous in that it precludes exertion of side
thrust or torsion against the feed rocker idd and
thus eases ,the action of 'the feed mechanism.
In order that tight stitches may he formed hy
the machine, there is provided a nipp‘er or inter
mittent tension means for the needle ihre, this
means being shown in Fig. I as comprising a ver
tical sleeve W5 which is fast in a boss t28 at the
30 top of the overhanging arm 3, and which is sur
mounted by a regulatable tension device it'i
adapted to be actuated by an eccentric t28 on the
main shaft 'I through a thrust pin or plunger itt
guided in said sleeve.
Also, during the sewing, the slack of theviooper
„thread is absorbed> by a take-up device which is
generally designated by the numeral |30 in Figs.
I and IV. This take-up comprises a rotary cam
disk |3| which is secured to the supplemental
shaft 03 and which projects through a slot |32
in an inclined guard plate |33 suitably secured
beneath the work support of the machine and
overreaching said shaft. Fastened to the guard
plate |33 by screws |33 is 'a upshaped hold-_down
tongue |30 of wire (between which and the plate,
crank; and a connection between the needle har
and the pin of the crank including a link, a lat
eral pivot on said bar in engagement with a boss
at one end of the link, a’hall free to rotate on
the crank pin as an axis and engaging a spherical C1
bearing surface in a hoss at the opposite end of
the link.
` -
2. In a sewing machine, a frame with a work
supporting plate and a hollow overhanging arm
sustained by a hollowvstandard at one end of
said plate; a rotary shaft journaled within the
hollow of said arm; a needle har conñned to
vertical reciprocation in a head at the free end of
the overhanging arm; a balanced crank at the
forward end of the shaft; a crank pin on.,said
crank; and a connection hetween the needle bar
and the pin of the crank including a iaterai stud
on said roar in engagement with a bearing hoss
at one end of the link, a hall free to rotate on
the crank pin and engaging a spherical hearing 20
surface in a `boss at the opposite end of the
link, the last mentioned hoss having a scoop
projection adapted, during rotation of the crank,
to scoop up oil from a well within the head for
lubricating the hall and the crank pin.
3. In a chain stitch sewing machine, a frame
with a work supporting plate and a hollow over
hanging arm sustained by a hollow standard at
one end of said plate; a pair of longitudinal
shafts, one journaled within the hollow arm, and 30
the other journaled beneath the work supporti
plate; a train of intermeshing gear wheels form
ing the drive connection between the two shafts,
said gear wheels being enclosed in the hollow of
the frame standard and a counicating oil 35
sump pendant lfrom the work support; a needle
bar conñnïed to vertical reciprocation in a head
at the free end of the overhanging arm; a coop
erative looper, and a feed element below said
Work support; means adjacent the forward ends 40
of the two shafts whereby their rotary move
ments are converted respectively into recipro
catory movements of the needle- bar, and into
oscillatory and reciprocatory movements of the
looper and the feed dog; a tensioning device for 45
the llooper thread passes), and thread >guides |31
the needle thread; and a rotary cam on the
>at opposite sides of the slot in said plate. The
upper of the two shafts for actuating the‘tension
ing device to intermittently apply tension on-
rotary take-up just described corresponds incon
struction and principle of -operation with that
forming the subject matter of a copending appli
’ cation Serial No. 24,495, filed on June l, 1935 by
Charles S. Thompson.`
. From the foregoing it will be seen that in 'our
improved sewing machine, we have utilized but
55 two rotating shaft‘s which are interconnected hy
a gear train drive system, and from which the
rotary movements are translated, through light
vand dynamically balanced anti-friction parts,
>into reciprocatory movements oi' the needle, the
the thread.
4. In a chain stitch sewing'machine, aframe 50
with a work supporting plate and a hollow over
hanging arm sustained by a hollow standard at
one end of said plate; a pair of longitudinal
shafts, one journaled within the hollow arm, and
the other iournaled beneath the work support 55
ing plate; a train of intermeshing gear wheels
forming the drive connection between the two
shafts, said gear wheelsl being. enclosed in the
hollow of the frame standard and a communi
looper and the feed dog, at regions local to these eating oil sump pendant from the work support; he
cooperating elements. In this way, we have a needle har confined to vertical reciprocation in
edêctively avoided strains and restraints in the a head at the free end of the overhanging arm; a
moving parts such as would result in excessive cooperative'iooper, and a' feed element loelow
heating to theadvantage that the machine can said work support; means adjacent the forward
ends of the two shafts whereby their rotary move 65
“ be operated at much higher speeds than hereto
ments are converted respectively into _recipro
fore attainable.
Having thus described our invention, we claim: catorr movements of the needle bar, and into
l. In a sewing machine.' a frame with a work oscillatory and reciprocatory movements of the
looper andthe feed dog; and tension devices
supporting plate and a hollow overhanging a
70 'sustained by a hollow standard at one end of said respectively for the needle and looper threads
plate; a rotary shaft journaled within the hollow controlled hy rotary means respectively on the
of said arm; a needle bar confined to verticali
reciprccation in a head at the free end of the
overhanging arm; a counterbalanced crank at
the forward end of the shaft: a crank pin on said
upper and lower Mits.
5. In a chain stitch sewing machine, a fre
with a work supporting plate and a hollow over
hanging arm sustained hy a hollow standard >at 75
one end oi said plate; a pair oi icngitudinai
shafts, one journaieci within the hollow arm, and
the other journaled beneath the work support
plate; a` needle operated from above the Weil;u
supporting plate; compiementai stitch-forming
mechanism cooperating with the needle below the
ing plate; a train oí’ intermeshing gear wheels
Work-supporting plate; and a longitudinal shaft
composed ci’ two axially-aligned sections with a
forming the drive eonnectionhetween the two
shafts, said gear wheels beine enclosed in the ' crank formes“-h at one enti. of one of saisi sections
"noilow of the frame standard and a. communicat
ing oil sump pendant from the Wort: support; a
needie bai' confined to verticai z'ecipi'ocation in a
'10 head
the free end. of the overhanging
cooperative looper, and a feed element ioelow saisi
work support; means adjacent the forward ends
of the two shafts wi'iese‘oy their" rotai‘y inove«
ments are ccnveiteci sespectiveiy into i'ecipi‘om
eatery movements of the needle bei“, and into
oscillatory and ieciprooatoiy movements oi’ the
iooper and the feed doe; a tensioning device ici`>
>the needle
two shafts
for aactuating
rotary cam
the upperde»
vice to inte'fmittentiy appiy tension on the needle
thread; and a rotary tension device for the loopei.e
thread actuated from the ioweil sloai'tq
e. ‘in a sewing machine„
actuating the complementai stitch-forming
mechanism, and affording connection for the con»
tiguous end oi the othei‘ shaft section.
7., En a sewing machina a work-suppoi‘tine
plate; a needle operated. iron?. above the worth
supporting plate;- oomplementai stitcndoi'n’iing;
>nfieciianisnri ccopeieting with the needle "neiow
the Wori§~supporting plate; anni a longitudinsi
sine-ft composed of two axially-aligned sectione
with a orfani; termed at one enc?, oi' one of saisi
sections for actuating the complementai :stitchu
forming mechanism, and having a socket within
which the contiguous ene. of the other
tion is received and secui‘eeî..
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