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Jan. 14, 1947.
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original Filed Der? 3b, 1959
4 sheets-sheet 1
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Jan. 14, 1947.
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Original Filed Dec. 30, 1939
4 sheets-sheet 2
` Jan. 14, 1947.
2,414,168 `
Original Filed Dec. 30, 1959
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Jan. 14, 1947.
Original Filed Deo. 30, 1939
4 Sheets-Sheet 4
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Patented dan. 14, 1947
Oscar Quist, Chicago, Ill., assignor to Union
Special Machine Company, Chicago, Ill., a cor
poration of Illinois
Original application December 30, 1939, Serial No.
311,722, now Patent No. 2,345,992, dated April
4, 1944. Divided and this application February
26, 1943, Serial No. 477,189
3 Claims.
(Cl. 112-237)
This invention relates to sewing machines, and
more particularly to mechanism provided in such
machines for lifting a presser foot which is ar
ranged to retain work against a .base or other
work support.
The present case is a division of application
Ser. No. 311,722, ñled on December 30, 1939, now
Patent No. 2,345,992, granted April 4, 1944.
An object of the invention has been to provide
sim-ple but effective, conveniently located, and
readily operable presser foot lifting devices in a
machine which is substantially completely en
closed to facilitate lubrication.
The invention is especially concerned with a
machine having a hollow frame comprising a base
or work supporting member, a vertical standard
and an overhanging arm, carrying a needle head
at its outer end. The needle head is equipped
with vertically movable needle and presser bars.
A part of the setting for the invention is the pro 20
base beneath the work support. Suitable connec
tions are provided for rocking said member by a
foot treadle or the like.
Other` objects, features and advantages of the
invention will appear from a detailed description
of an illustrative embodiment of the same which
will now be given in conjunction with the accom
panying drawings, in which:
Fig. I is a view in vertical longitudinal section
of a lock stitch sewing machine embodying the
present invention.
Fig. II shows the machine in top plan.
Fig. III is a horizontal section taken in a plane
below the level of the work support of the ma
Fig. IV is a view partly in elevation and partly
in cross section, taken as approximately indicated
by Athe angled arrows in Figs. I and III, with the
cover of the needle head removed to expose the
Parts at the interior, and
vision of means within such a machine for dis
tributing a ñne mist or spray of lubricating oil
Fig. V shows the machine in rear end elevation
with portions broken out and shown in section
within the hollow frame and delivering said oil
to better illustrate important details of the trame
to various operating parts including the mecha
nism` in the needle head. Another feature is the
With refernce ñrs-t more particularly to Figs.
provision in such a machine of a presser bar lift
I to IV, it will be observed that the machine
ing mechanism including a rock shaft extending
chosen for exempliñcation of my invention has a
longitudinally through the interior of the upper,
hollow work-supporting base I with a top wall 2,
hollow arm. Connections are provided from one
front and rear side walls 3 and 4 and ends walls
end of the rock shaft, within the needle head, 30 5 and 6. The hollow 'I of the base l is closed at
to the presser bar and connections are provided
the bottom, with interposition of a sealing gasket
adjacent the other end of said shaft, at or near
8, by a removable cover plate 9 and is employed
the hollow standard, for imparting a rocking
as a sump for oil which is normally maintained
movement to the shaft whenever it is desired to
at the level indicated at L. Rising from the base
lift the presser bar. As a special advantageous
I at one end is a hollow standard I0,`which, at
feature of this construction, the connections for
the bottom, communicates directly with the
operating the rock shaft include a lever which is
chamber -I and with which is integrally formed a
passed through the wall of the upper, hollow arm
hollow arm II. As shown, the arm II over
at a recess in the latter adjacent a bearing for
reaches the base I and terminates at its free end
the inner end of the shaft.
40 in a hollow head I2. A crosswise partition I3
Another object of the invention has been to
isolates the hollow of the head I2 from the: hol
provide an enclosure for all of the moving parts
low of the arm Il, which latter, at its rear end,
of the machine, except those acting directly upon
communicates directly with the hollow of the
the work being sewed and those requiring ma
standard I0, as best shown inY Fig. I. Extending
nipulation from the outside, and to place these
longitudinally through the arm II and journaled
in protecting recesses, so as to avoid projections,
in bushings I5 and I6, set, respectively, into the
particularly of moving parts, which might cause
partition I3 and the rear wall of the standard
injury to the operators or with which the work
IU is a rotary shaft I’I. As shown, 'this shaft I1
might catch and become torn. Toward this end
protrudes to the exterior of the frame arm at its
the means for operating the lever connected with
right hand end and at its outer end carries a
the rock shaft includes a thrust bar extending
combined hand and belt wheel I8 by which the
downwardly from said lever through an opening
machine may be operated either manually or un
in an overhanging portion of the work support,
der power.
and attached at its lower end to a rock member
Conñned to axial reciprocation in bushings I9 mounted in a recessed or set-in portion of the 55 and 20, respectively, at the top and bottom of the
hereinbefore referred to. An arm 16 von the left
hand end (Fig. III) of the `regulating shaft 'l5 is
head I2, is a bar 2|, which, at its lower end, car
ries a needle 22. Through a link connection 23
with a crank pin 25 on a disk 26 at the end of
connected by a “lazy” bar ‘H to a stud 'I8 on
the sleeve member of the telescopic link lll. At
the shaft Il within the hollow of the head I2 the
needle bar 2l is given its reciprocating motion.
Rotation of the needle bar 2l within its bearings
is prevented through engagement of the outer
end of the lower pivot pin 2ï for the link 23 in a
vertically-grooved guide 28 interiorly of the head
l2. From Fig. I it will be noted that the drive
-shaft l'l also has journal sup-port in a sleeve 29
set into a pendant bearing lug 30 Within the hol
low of the needle arm H. As shown in Fig. III,
the end wall 5 of the base is` angularly recessed
as .at 35 to accommodate the loop taker of the
its right hand end beyond the bearing lug 45, the
shaft 'E5 is provided with another» arm 'i9 which
is urged counter»clockwise, as viewed from the
right in Fig. III (see also Fig. V), by a torsion
spring Se and against which the inner end of an
,I adjusting rod 8l abuts. As shown in Fig. V, the
rod 8i has a screw-thread engagement with a lug
82 within the base l and extends at an inclination
through the front wall of the standard It to the
exterior. At its outer end the rod 8i is provided
v: with aknurled manipulating head $3.
machine, which, in this instance, has the form of
For fur
ther details as to the arrangement and operation
of the rod 5l and other parts of the feed regulat
a rotary hook 36 and which cooperates with the
ing means, reference may be had to the patent
needle 22 beneath the work support 2 in stitch
to Sauer and Smith, No. 2,035,508, granted on
formation. The rotary hook 35 is secured to the
protruding end of a shaft 3l which extends 20 March 31, 1936. Lifting and lowering movements
are imparted to the feed dog 5e from a crank 85
through> a bearing sleeve 5t ñXed in the end wall
at the outer (left hand) end (Fig. III) of- the
5A of the base. Within the chamber '1,` the sleeve
lower shaft dâ, said crank being connected
is supported in a bearing lug 39 pendant from the
through a Vertical link 85 with a curved depend
top wallI 2- of the base (see Figs. I and III) while
ing arm 3l (Fig. IV) on the carrier 55 for the
theinner end- of the hook shaft 3l' extending be
feed dog 5G. The construction ‘and operation~ of
yond the> sleeve is journaled> in a shorter sleeve cr
the entire feed mechanism just describedl is sub
bushing 33a set into another pendant lug ¿iii
stantially identical with that disclosed> in the
Within said base spaced from the lug 39". Through
above-mentioned Sauer and Smith patent, to
aV pair of intermeshing spur gears ‘il and 132», the
Yhook shaft 31 is driven from a rotary shaftV 43
which extends longitudinally of the chamber 'l
and which is journaled in bearings, respectively,
providedA by the end wall 5, the lug 3i!Y and a web
projection ¿i5 extending forwardly from the rear
which reference may be had for details if found
In its feeding action, the dog 53 reacts with
a presser foot 98 pivotally connectedA to a shank
member 9i at the lower endV of a presser bar 92.
Wall 4 within the base. By means of a train of 35 As shown in Fig'. IV, thepresser bar QE'eXtends up
through a bearing in the bottom of the needle
intermeshing spur gears £6, fili andy 48 within
head l2, and, within the hollow of thel'atter, car
.the hollow of the standard I9, the lower shaft 4?.
ries a collar eti against which the lower endl of a
isA driven from the upper shaft Il in the same di
helical compression spring 951 bears.`y At its top,
rection and at the same speed. It is, however, to
be noted that the ratio of the spur gears 4|Y and 4 40 the spring 95l abuts the upper bearing- sleeve 96
for the rod S2, which sleeve is threaded'for adjust
42„ is such as to impart two revolutions to the
ment in the needleihead i2 so-that the pressure
hook shaft 31'for each revolution ofthe upper
of the spring may beregulated- as desired or re
shaft Il from which the needle bar Z‘l is` actuated.
The feed mechanism of the machine includes a
feed dog 5f', the teeth of which operate upwardly »f
through slots 5l in a throat plate 52 set into the
inner end, of a` cut-outY 53> in a cover plate 54,
which is in. turn set into a depression 55 in the
upper surface of the top wall 2 ofthe base l' at
the front end of the latter (see Figs. I, II' and
IV). From Fig. IV it will be observedi that the
feed dog 5il‘ is secured, with capacity for vertical
adjustment, to a carrier 5t having; a cylindric
shank which extends inwardly through a clear
ance opening 5l' in the longitudinally offset por
tion 58 of the end wall'5 of the base I.` The inner
end' of the, carrier bar 55 is secured by set screws
59j'in a socket member 6U having a transverse boss
El (see also Fig` III) in which a pin 62 is in turn
secured for pivotal connection to the top of a 60
rocker 53; This rocker ëäreaches upwardly from
a> rock shaft t5 journaled' at its. opposite ends in
bushings 65 and (il, respectively, set into the end
wall 5 of the base and into the laterally offset por
tion, 63 of the. rear wall li'. Also secured to the
rock shaft t5. within the chamber ‘l is an up
wardly extending arm S9, which, through a tele
scopic link 7G, is connected to the strap 'H of' an
actuating eccentric ‘l2 on the shaft 43. Under the
InY order that the presser foot Silmay be raised
to facilitate` insertion of the work'beneath it ini“
tially, there is provided a con-trol mechanism in«
cluding» a shaft el within the hollowef the over
hanging arm I'lv, said- shaft being journaledA at its
opposite ends in» the- partition I3- and in the lug
t0, respectively». The left hand end of the» shaft
9T (Fig. I) extends‘through the partition I~3-into
the- hollow of the needlehead l2 and there has
an arm- 98» (Fig. IV), which, through a link-*93,
is connected to a collar 93a which» is slidable on
the presser bar, and which- is normally spaced
from the lower face of the collar' 53, so that dur
ing the operation- of the-machine,v the presser bar.
is subject» only> to the influence of the spring 95;
A torsion spring E00 surrounding-theend» ofr the
shaft 91"! within the head l2 tends to rotatesaid
shaft clockwise in Fig. IV and through .the~ link
99> causes theloosely mountedA collar 83a. onr the
presser bar B2 to be normally heldv in its lower po
sition in engagement with the bottom of the
needlehead I‘Z- and away from-collar 93; Secured
tothe shaft 9T within a lateral recess. l-Dl- in, the
lug 3€) in the hollow of the frame arm I l~ (Figs.l I,
II and V) , is an opera-ting lever H32- which reaches
influence of the eccentric l2 andthe interposed 70 outward from said armv forv connection to» a
pendant link rod HB3. 'I’hisV link rod» |03- passes
parts just described; horizontal feeding move
through a guide holev in the work support 2- and
isl connected» at its lower end to oneY extremity of
a motion translating lever- |95 fulcr-umed- on» aY
' dog 5@ includes a regulating shaft ‘l5 (Figs. III
andV) which is journaled in the lugs 39 and 45 75 fixed- stud> let which extends outward from the
ments are imparted to the feed dog 55j. The
means for regulating the feed throw ofthe feed
inwardly recessed portion |61 of the rear side wall
4 of the base I. The other extremity of the lever
|05 is engaged from beneath by a pad at the top
of the thrust rod |08 which may extend to an
actuating knee press or foot treadle, not illus
trated. Due to the lateral recessing of the side
wall 4, it will be seen that the presser foot con
trol connections are kept within the eonñnes of
the work support 2 with consequent avoidance of
projections therebeyond.
As previously pointed out, the hollow of the
base | of the machine is utilized as an oil sump.
For the purpose of circulating the oil within the
machine to lubricate the various enclosed parts,
the oil is lifted from the supply as a consequence
of the dipping thereinto of the gear 46 on the
lower shaft 43‘. The oil thus lifted is further
carried up by the gears 41, 46 and, by the high
speed rotation of the latter; dispersed in the
form of a mist within the hollow of the standard
I0 and the connecting hollow of the frame arm
II. Some of this dispersed oil finds its way into
a pocket ||0 (Fig. I) at the top of the right hand
end bearing I6 for the drive shaft I1 and is con
ducted through a port III to the shaft surface
within said bearing, any excess oil being returned
into the base by way of a duct |I2 at the bottom
of said bearing. Part of the dispersed oil is also
caught by the open rear end |I3 of a tube ||5
which extends horizontally `forward within the
hollow of the frame arm I I and through the par
tition I3 into the needle head |2.` Wick filled
tubes II6, II1 and |I8 lead from the delivery end
of the tube II5 and release oil from above onto
the moving parts within the needle head I2. The
excess oil thrown off by the needle operating
mechanism is collected in a small sump I I 9 in the
bottom of the needle head I2. Connecting with
this sump |I9 is an inclined duct |20 which
leads upward to a lateral port I 2| in the left
Thefexcess‘oil dripping from the lubricated
parts drips back into the main supply within
the bottom of the base I and is recirculated by the
action of the gears 46-46. In order that the oil
' level in the base of the machine may be checked
from time .to time, there is provided a gauge ‘
rod |60 which extends down into the base I and
which at its top has a knob ISI accessible for
„ convenience of grasping it within a recess I 62
formed in the walls of the standard I0 (see Figs.
I and IV). Leakage of oil from the base I at
the clearance opening 51 through which the feed
dog carrier 56 extends is prevented by a moving
sealing means |63 which, as shown in Figs. III
and IV, comprises a plurality of washers |65
which snugly surround the cylindric shank of the
carrier 56 and which are pressed against the
face of a machined recess |66 in the inner side
of the wall 58 by a leaf spring |61. At its lower
end the spring |61 is secured to the wall portion
58, and at its upper end is bifurcated to straddle
the shank of the feed dog carrier bar 56.
In order that the more delicate parts of the
rotary hook 36 may be lubricated with a diifer
ent, lighter grade of oil from that used for the
other moving parts of the machine, there is pro
vided a separate source of supply for such oil
in the form of a glass gravity feed cup, which
is shown at |16 in Figs. II, IV and V as being
mounted on the top of the base I in the rear of
the standard I0. At the bottom, the cup |10
communicates with a vertical duct I1| in an
enlargement I 12 at one corner of the -base I with
in the chamber 1. Leading >from the duct I 1|.
within the chamber 1 is a tube |13 b-y which
the oil from the cup |10 is conducted to a nipple
I 15 screwed axially into the inner or cap bear
ing for the hook shaft 31 as shown in Figs. I
and III. As further shown in Fig. I, the hook
hand end bearing bushing I5 for the shaft I1, 40 shaft 31 is hollow and open within its inner bear
ing to receive the oil conveyed into said bear
which shaft, as shown in Fig. I, is formed with
ing by the tube |13. The internal construction
in the confines of said bearing with two relatively
of the rotary hook 36 may be as shown in U. S.
wide interlapping spiral grooves |22 pitched in
one direction and also with a shorter and nar
Patent No. 2,035,984 granted to George Sauer on
March 31, 1936, so that the oil may reach the
rower oppositely pitched groove |23. As the shaft
bearing surfaces between its rotating and non
I1 rotates, the helical groove |22 functions as
rotating parts. As a means for controlling the
a pump to constantly lift the accumulating oil
flow of oil to the rotary hook, there is provided
from the sump I I0 in the needle head through
a regulating screw I15a which engages radially
the duct |20 into the bearing I I5 to lubricate
it and to discharge the excess from said bear 50 into a collar enlargement |16 on the hook shaft
31 immediately behind the hook and externally
ing into the hollow of the frame arm II where
of the end wall 5 of the base I. As shown, the
from it drains along the downwardly inclined
inner end of the screw I15a is diametrically re
slope at the bottom of said arm back into the
duced and passes into the duct of the hook shaft
base I. At the same time, the smaller reversely
groove |23 slightly opposes the action of 55 to- partially obstruct said duct. This construc
tion is advantageous not only by reason of its
the longer groove |22 to maintain an oil seal
simplicity but in that it permits accurate adjust
within the bearing I5 and thus prevents air pump
ment of the oil ilow to the hook without neces-'
ing when the shaft becomes worn. Some of the
sitating disassembling of the latter for the pur
dispersed oil is, moreover, caught in a well |25
(Fig. I) integrally formed with the machine frame 60 pose.
While an illustrative embodiment of the inven
within the standard I0 above the lower shaft 43.
tion has been set forth in considerable detail, it
Leading horizontally from the well |25 through
will be understood that numerous changes may
the top wall 2 of the machine base I is a duct
|26 which delivers into a channel |28 formed in 65 be made in the construction, combination and ar
rangement of the various parts without depart
the depressed free end portion 55 of said top
ing from the principles and scope of the inven
As set forth in detail in said parent applica
I claim:
tion, provision is made for the distribution of
1. In a sewing machine having a frame with
lubricant from the channel |28 to various bear 70
a hollow work supporting base containing a sup
ing surfaces of the shafts 31 and 43, the gears
ply of lubricating oil, and a hollow overhanging
4I and 42, and the work feeding mechanism. The
arm sustained by a hollow standard at one end
right hand end bearing 45 for the shaft 43 is
of said base, the hollows of said base, arm and
lubricated by oil passing directly down through
a duct 45a from the wall |25.
standard being intercommunicating, needle op
75 erating mechanism in a head at the free end of
ther» frame arm, and; means for elevating; oil from
the/supply and dispersing itas rasmist within thel
standard for. lubricating moving parts WithinV the
frame,` the combination of aV presser: bar confined.
to up. and down movement. in. the. needle- head,and means for lifting thezpresser bar including*a horizontal. rock shaft. journalledv in. a, bearing'
lugY within the frame arm adjacent‘the upper end>
of said standard. alifting arm. on the shaft: with',
in the needle head" and connected' to. the; presser.
bar, an operating` lever connected to the shaft
in a.. recess. opening into the framefarm> in'V the;
said needle. head, a- rocky shaft extending longi
tudinally.- Within said arm, Y connections from-said
shaft. to said. presser» bar> for lifting; the same,V
an. operating member connected; with said` rock.
shaft andextending through a substantially sea-led.
opening in a; wall> of. said overhanging arm,` said.
Work supporting> member being externally re
cessed in. its rear-wall at`r a; point beyond the nor-V
mal; path. of travel ¿of the work passing over said.
supporting member and, having. an yaperture
through itsv worlesupportingv surface in the region
of said recess; a rock memberl mounted. on said
work: supporting member in saidrecess andV ar
bearinglug aforesaidand extending outward from
said recess, the rear~` wall of the basebeing in,
wardly recessed, saidy recessed portion being over.
hung'` by the topiwalllof the’ base; a motion trans
lating lever f-ulcrumed intermediate itsl ends`
ranged tovbe. operated, atzwill, anda link passing:
» throughy said aperture connected. at, itsv opposite
ends with said; rock member and with: said> op
erating member. .
3.. In. a sewing- machine,_. a. hollow> frame; oom
prisingY a1 base,_a.standard rising-l from` oney end of.
wall portion of the base, said operating.` lever on:
the ~base,.andî an overhanging arm extending from
the rock shaft extending laterally from the frame; 20 said. standard; over said base. and carrying a nee
arm, at'hrust'. bar extending: down'from the. op
dle head. at,y its end, said; base` comprising an en
erating lever and. through a; guide hole inthe
closed housing havingazgenerally rectangular out
overhangingl portion of the work` support to one
line in. plan but, having an external recess. in one
on a stud. projecting outward; from the recessed;
extremity of the motion translating; lever',4 and
side, a presser bar movable up and down in said
means enabling thev connection of the other eX' 25 needle head, and; means for lifting. said presser
tremity of the motion translating lever'to an ac
bar comprising; a. roel; member mounted in- said
tuatingfknee pressor footgtreadle.
recess. in said. side. of. the> base exteriorly of the.
2. Ina sewing machine having a` hollow frame
enclosedhousing. a link connectedwith said mem.
with a work supporting. member, a vertical stand
ber extendingl along. said... standard, a. rock shaft
ard and an. overhanging arm in interoommunica 30 within. said arm connected at: one end. with` saidi
tion, said arm carrying a needle head at its free
end, the lower portion of said framebeing formed
to provide a lubricanty sump. from which oil may
be dispersedthrough said frame, theY combina.
tion of a` presser bar. movable up and down in 35
link and at its other: end. with. said presser, bai.;
and spring; meansY operableV to hold` said` presser;
bar lifting means normally; in an idle position.
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