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06¢. 15, 1946.
Filed Oct. 2, 1943
5 Sheets-Sheet 3
0a. 15, 1946.
Filed Oct. ‘2; 194a
5 Shéets-Sheet 4
, 2,409,592
FiledOét. 2, 1945
5 Sheets-Sheet s ‘
Patented Oct. 15, 1946
Anthony Sardu, Brooklyn, N. Y.
Application October 2, 1943, Serial No. 504,787
1 Claim. (01. 112-172)
ings and pointed out in the claim which forms'
This invention relates to an overcast sewing
machine having a needle in the form of a single
part of this speci?cation.
circular arc and which passes completely through
the fabric being stitched.
An object of this invention is to provide im
responding parts throughout the several views, in
Reference will‘ now‘be had to the drawings,
wherein like numerals of reference designate cor
proved means for positively holding and driving
Figure 1 is a side elevation of the sewing ma
the needle, the said means comprising a plu
chine, partly broken away to show the interior
rality of cavities of circular cross-section in one
side of the needle and spring-‘pressed pins slidably
Figure 2 is an end view showing the front por
mounted in a rotatable disk or head and adapted 10
tion of the sewing machine shown in Figure 1.
to enter said cavities for gripping and rotating
Figure 3 is a cross-sectional view, the section
said needle.
being taken as on line 3-3 in Figure 8.
Another object of this invention is to provide
Figure 4 is ‘a front elevation of the needle.
a needle shaft having the said head at one end
Figure 5 is a fragmentary perspective view
thereof, and a housing enclosing the head. The
showing a schematic cam and needle-gripping
head has a circular groove of a depth adapted to
pin arrangement.
receive the needle to approximately one-half of
its thickness. ‘A cover has a circular groove for
receiving the other half of the needle; means is
also provided for securing the cover and housing
to the frame of the sewing machine in a manner
as to cause concentric alinement of the grooves
and ‘for supporting the needle in concentric rela
tion with the needle shaft for rotation thereby.
Another object of this invention is to provide a
needle-plate positioned in parallel relation with
the needle shaft. and having a tongue projecting
therefrom and to remove a portion of'the housing
7 Figure 6 is a fragmentary top plan view of the
cam and needle gripping pins.
Figure '7 is a front view of the housing and
head or carrier for the needle-gripping pins.
‘Figure 8 is a front view of the housing and
threading door, on an enlarged scale.
Figure 9 is a plan view of the cloth and needle
plates, and a stitched fabric strip.
Figure 10 is a plan view of four-motion actu
ating mechanism for the feed-dogs.
Figure ‘11 is a side elevation of the feeding
‘ mechanism shown in Figure 10.
to permit the tongue to be positioned inwardly
of the housing, clear‘ of the path of the needle, 30 Figure 12 is a fragmentary‘ cross-sectional View
of the mechanism shown in Figures 10 and 11, the »
and the needle to pass around the tongue.
Another object of this invention is to provide a
housing cover having a cut-out portion in aline
ment with the cut-out portion in the housing and
to provide a needle plate positioned in a horizon
tal plane and adapted for supporting fabric in
position for the needle to pass through an edge
thereof, the cut-out portion of said cover form
ing a guide for the fabric.
Another object of this invention is to provide
cam means positioned inside said housing and
section being taken as on line I2-—I2 in Figure 11. ‘
In the illustrated embodiment of the inven
tion, the numeral It] indicates a sewing machine
comprising a ?xed hollow box-like frame I I ha= -
ing a main drive-shaft I2 mounted in the lower
portion thereof, the drive-shaft I2 having a gear
I3 secured thereon.
An idler shaft I4 is rotatably mounted in the
frame I I above the shaft I2 and carries a gear I5
which is in intermeshing relation with the‘ gear
adapted to release said pins successively from
A needle shaft I6 is rotatably mounted in a
said needle prior to the approach of its sharp
housing H at the front end of the frame I I. The
pointed end to the needle plate to permit succes 45 needle shaft I6 is in right-angular relation with
sive portions of said needle to pass through said
the idler shaft I4.
> >
A bevel gear I8 secured to the idler shaft I4 is
in intermeshing ‘relation with a bevel gear I9
secured to the needle shaft I6. ‘The housing I’!
with said needle actuating mechanism to cause ‘50 is secured‘ to the frame I I by screws 2!). One end
‘of th’e‘housing H has a circular portion 2|. A
simultaneous overcast stitching and feeding.
coverEZ having a circular portion 23 of the same
With the above and other objects in view, the
periphery as the circular portion 2| of the hous
invention 'will be hereinafter more particularly
ing I‘! is secured to the housing I‘! by screws_24.
described, and the combination and arrangement
of parts will be shown in the accompanying draw 55 As shown on an enlarged scale in Figure 3,
fabric while being rotated.
Another object of this, invention is to provide
four-motion feeding means in coacting relation
the arcuate needle 25 is rotatably mounted in a
circular groove 26 in a disk-shaped enlargement
2'! at one end of the needle shaft IS. The disk
in the needle. The length of thread from the
aperture 48 to the needle is thus constrained to
follow the orbit of a cone.
An embodiment of a four-motion double feed
shaped enlargement 2‘! is enclosed by the hollow
circular portion 2| of the housing ll. It will be
noted that the needle 25 is also rotatably mounted
in a circular groove 28 in the circular portion 23
of the cover 22.
It is to be noted that the needle 25 has cavities
33 positioned crosswise of the needle and that 10
shoulder pins 3| having pointed ends 32 slidably
mounted in the disk-shaped portion 21 ,of the
needle shaft it, are resiliently pressed by coil
springs 33 into the cavities 3B and into engage‘
ment with the needle 25.
For the purpose of this invention, the shoulder
pins 3| must be released successively from en
gagement with the needle 25 prior to the approach
of the sharp pointed end 28 of the needle to a
ing mechanism 58 is shown at one end of the
machine in Figure 2. The feeding mechanism 56,
best shown in Figures 10 to 12 inclusive, com~
prises a front feed-dog 5| and a rear feed-dog
The feed-dogs ill and 52 are respectively car
ried by elongated feed bars 53 and 54 which are
~ . positioned in parallel relation and extend from
the front to the rear of the machine. The feed
bar 53' adjoins an end face of the frame ll.
At the rear; each feed bar is bifurcated to pro
vide rectangular openings, the opening in the
bar 53 being numbered 55 and the opening in the
bar 55 being numbered 56. The openings 55 and
56 receive in sliding engagement a rectangular
cloth plate 43 having a horizontally positioned 20 block 51', which is rockably mounted upon a pin
work supporting surface. I provide an arcuate
58.1ixed in the frame I I.
cam Ill fixed to the end. wall 41.2‘ of the housing ll‘.
At the front, each feed bar is bifurcated to
The cam 41 has a sharp end 43” which successively
provide rectangular openings, the opening in the
engages-collar-shaped outer ends 38' of the pins
bar 53 being numbered 60 and the opening in
31' and pulls the pins in a direction parallel with 25 the bar 54' being numbered GI. The openings 68
the shaft [6.
andtl receive in sliding engagement a rectangular
Each shoulder pin "5! and spring 33 is mounted
block 62 which is mounted on an eccentric por
inside an aperture 313 in the disk-shaped portion
tion 63 of the shaft l2 and is vertically movable to
27 of the needle shaft it. I provide apertured
lift the feed-dogs.
disks 35, Figure 6, which are suitably mounted 30 At the end adjacent the eccentric portion 63,
in they reduced end portions 36 of the pins 3!.
the main shaft [2 has a reduced stem 55 which
Rivets 3'! hold the disks 35 ?xed to the outer sur
is concentric with said shaft. Upon the con
face of the disk-shaped. portion 27. In the as
centric stem 85 there are mounted two eccentrics
sembled position shown in Figure 6, the disk
66 and 67 keyed to the stem by a key 68.
shaped- outer end 38' of the shoulder pin 3! is in
The eccentrics 66' and‘ 6'! impart horizontal
spaced‘ relation from the vertical. face 44 of the
motions to the feed-bars 53 and 54, motion being
disk-shaped portion 2? a distance sui?cient to
transmitted through a link connection 69 between
cause disengagement of the pins- 31, one at a time,
the eccentric 63 and the feed-bar 54, and a link
from the needle 25, prior to the approach of the
connection '2'!) at one side of the link 69, between
needle cavities- 3B; 36, torthe cloth plate or work
the eccentric 57 and the feed-bar 53. The forward
supporting base 46.
ends of the links 69 and ‘ill encircle their respec
It is to be noted that the spaced relation of
tive eccentrics S5 and 61, and at the rear ends
the collar-shaped outer ends 38 of the shoulder
are pivotally secured to their respective feed
pins M from the rear face 44 of the disk-shaped
bars by bolts ‘H and 12 which extend from the
portion 2.?- is such. as to. permit each collar 38v to
feed-bars parallel» with the shaft £2.
engage the sharp. end 43 of the stationary cam
The bolts ‘H and ‘i2 serve to clamp sleeves T3.
él. When the collar (53 reaches the mid-portion
'54‘ against the feed—bars. The sleeves form
of the cam, the pin St is pulled out of engage
pivotal supports for the rear ends of the links 68,
ment with the needle. During the time the collar
It. The link 78 has an ‘elongated opening 75
remains in contact with the cam, the pin remains
through which the bolt 12 and sleeve ‘i4 pass
out of engagement with the needle; The moment
without interfering with the movements of the
the collar passes the cam, the pin is instantly
link 6'9.
forced back into engagement with the needle by
In operation, the eccentrics 6S and ii‘! impart
the spring 33. horizontal motions to the feed-dogs 5!, 52'. The
In the embodiment of the device shown in
ecc‘entrically actuated block 52 effects vertical
Figures 4 to '7 inclusive, the needle 25 used there
movements to the feed-dogs. .
with has two cavities 30 for engagement with two
Two cooperating four-motion feeding means
pins 3|. Under practical conditions where heavy
are thus provided, each of which may operate in
material is to be penetrated by the needle, three
all its movements independently of the other.
cavities 3G and three pins 31 may be employed (ii) By giving the rear feed-dog 52 a greater amount
so as to provide two pins in engagement with the
of horizontal movement a stretching of the fabric
needle while one pin is out of engagement.
may be eifected. By giving the forward feed-dog
As shown inv Figure 8, the annular cover 23 on
5| va greater amount of horizontal movement a
the housing I‘! (Figure 3) has a threading door d5
gathering of the fabric may be effected. The
pivotally mounted on a pin 46 secured in ears 4'!
feed-dog 5| operates in advance of the needle 25
integral with the housing cover 22. The door
and the feed-dog 52 operates in the rear of the
4-5 has a threading aperture 48 therethrough.
The aperture 48 is positioned in the axis of rota~
A presser-foot 80 is carried by a presser-bar 8 l’
tion of the needle 25 to permit a thread passing
whichisslidably supported in the sewing machine
through the aperture into the opening within 70 head 82.
theannular cover 23 to follow the needle during
In operation, a thread 83 is passed between
its rotation.
thread tension discs 84‘ and then through the
It is to be noted that the needle thread is at
threading aperture 48 in the threading door 45.
the central portion of the axis of the orbit of the
The thread then enters an aperture 85 in the
needle and that an end of the thread is threaded
needle 25, then passes through a concealed arcuate
groove 86 in the interior of the needle and ?nally
emerges through an aperture 81 near the pointed
end 29 of the needle.
Upon rotation of the pulley 89 the needle 25
is rotated. The needle carries the thread 83
through an edge portion of fabric 99 lying hori
zontally upon the cloth plate 40. The needle then
key I92 enters the cavity 195, when it is possible
to swing the presser-foot 89 towards the rear
or to the left of the machine to provide a clear
space in front of the threading door 45.
As shown in Figure 9, it will be seen that the
stitching 9| is straight on the top of the fabric,
while the stitching below the fabric is inclined.
It is to be noted that when it is desired to make
passes round a tongue 11 in the needle plate 18.
inclined stitching on the top or normally exposed
Repeated actuation of the sewing machine causes
the feed-dogs 5| and 52 to impart a feeding move 10 surface of the fabric, that the said surface is
placed up side down on the cloth plate 40. It is
ment to the fabric for every stitch and, as best
thus possible to stitch straight stitching or in
shown in Figure 9, there is formed a continuous
clined stitching as desired on any surface of the
row of overcast stitching 9| along an edge of the
cloth. ’
fabric 90.
In accordance with the patent statutes I have
As shown in dotted lines in Figure 2, the upper 15
described and illustrated the preferred embodi
portion of the presser-bar 8| has a reduced por
ment of my invention, but it will be understood
tion 92 which carries a coil spring 93. The upper
that various changes and modi?cations can be
end of the spring is housed in a cavity in the lower
made therein without departing from the spirit
portion of a tubular threaded member 94. The
lower portion of the spring 93 rests upon an en 20 of the invention as de?ned by the appended
larged lower portion of the presser-bar Bl. The
threaded member 94 may be adjusted to cause
I claim:
In a sewing machine having a stationary frame,
the presser-foot 80 to bear upon the fabric lying
a needle shaft, a horizontally positioned work
upon the cloth plate 40 with a desired feeding
pressure. A lifting lever 95 is slidably mounted 25 supporting base ?xed to said frame and in line
with the axis of said needle shaft, a rotatable
at the rear of the head 82 and carries a screw 96
needle in the form of a semi-circular arc and
by means of which the lever is secured to the
having a threading passageway in a portion of its
presser-bar 8 l. The operator raises the lever, and
arcuate body, and an opening at each end of said
presser-bar, and presser-foot to permit the
passageway, permitting passage of a thread
manipulation of the fabric lying between the
through said passageway, means for causing rota
presser-foot and the needle plate 18.
tion of said needle, a needle plate positioned
As shown in Figure 1, this machine comprises
parallel with said needle shaft and having a
a controllable lubricating system 91 shown in my
tongue projecting therefrom, said needle being
Patent No. 2,202,817. This system comprises
wicks 98 lying in an oil reservoir 99 and extending 35 movable between said tongue and the body of
said needle plate, said needle plate being adapted
to parts to be lubricated, such as the gears l3, I5
to support fabric thereon in a horizontal posi
and bearing for the shaft 14, etc. An oil drain
tion, resiliently contacting thread tension disks
valve I90, disclosed in my said patent, maintains
mounted above said work supporting base, a sta
a predetermined oil pressure inthe oil reservoir.
An oil storage chamber I0] and a pump (not 40 tionary threading door mounted on said frame
in spaced relation from said needle and in parallel
shown) serve to provide a constant circulation of
oil during operation of the sewing machine.
As shown in Figure 2, the lower portion of the
head 82 is broken away to show the presservlbar 8|
relation with the plane of rotation of said needle,
said door having a threading aperture in aline
ment with the axis of said needle, said axially
having a key I02 which is slidably mounted in a 45 alined door aperture permitting a continuous
supply of thread to be fed to said needle in a
slot I03 in a bushing I04. The slot I03 terminates
conical orbit during rotation of said needle.
in a ‘circular cavity I05 above the slot. The
operator may thus raise the foot 80 so that the
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