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Патент USA US2132379

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Oct. 11, 1938.
c. BONIS
2,132,379
FUR SEWING MACHINE
Filed April 50, 1938
3 Sheets-Sheet l
INVENTOR.
Caesar Eon/'5
BY
ATTORNEY.
Oct. 11, 1938.
c. BONIS
2,132,379
FUR SEWING MACHINE
Filed April 30, 1958
5 Sheets-Sheet 2
INVENTOR.
Caesar Bon/_$_
BY
A
TTO
RNE .
Oct. 11, 1938.
2,132,379
c. BONIS
'
FUR SEWING MACHINE
Filed April 30, 1938
5 Sheets-Sheet s
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BY
ATTORNEY.
Patented Oct. 11, 1938
2,132,379 ’
.UNITED STATES PATENT OFFICE
2,132,379
FUItSEWING MACHINE -
Caesar Bonis, Brooklyn, N. Y.
Application April so, 1938, Serial No. 205,177
7 . Claims. (cit. 112-15?
an illustrativa'rather than a restrictive stand: .
and more particularly to the needle bar and loop
In the accompanying drawings:
4
'
er frame mechanisms aynd‘has'for 'one of its ob
jects the provision of means for'eliminating all
Figure 1 is aside view partly in section of a fur
5i lost motion in said mechanisms due to wear,_such ‘sewing machine embodying myinvention’,‘ "only '53
wear atjthe present time causing breakage of the such portion of the ‘general mechanism being
needle and also slip stitching.
I
shown as is directly connected ‘with my improve
; This inventionrelates to fur sewing machines
point.
Another object of the invention is the provi
sion of a needle bar-yoke or carrier having a V
10 shaped slideway at the bottom thereof'which is
in sliding engagement with‘a rod, so as to prop—
erly guide the said yoke in its to and fro move
ment and prevent any'sidewise tilting or swing
ing thereof, such tilting carrying the needle bar
15 and needle out of proper alinement with the
needle guard. or plate and causes the‘ needle to
strike the needle .guard and become ' bent or
broken.
.
'
Afurther object of the invention is the provision
20 of such a combination of needle‘bar-yoke and
ments;
'
'.
-.
'
I,
'
'“ ‘ "
"
"
'
7" I,
' Fig. 2 is a fragmental top plan view thereof;
Fig. 3 is a fragmental rear view of the machine 10‘
showing the manner of mounting the lower guide
or rod upon which the needle bar yoke slides;
Fig. 4 is alfragmental sectional view taken on
line 4-4 Fig. 1;
'
Fig. 5 is a sectional view taken on line 5-5 Fig. 15
4, and showing the looper frame and the operat
ing mechanism therefor;
’
__
I Fig. 6 is a fragmental front elevation of the
looper frame and rocker connection; and
Fig. 7 is a modi?ed form of the needle bar-yoke 20
lower mounting in which the mounting is adjust
slide mounting.
able with reference to theyoke.
In the fur sewing machines now commonly used
the needle bar yoke is carried at its upper end on
the needle bar- and depends upon its contact with
the driving eccentric and other moving parts for 25
proper alinement. Inasmuch as the said parts
are subjected to hard wear, lost motion between
the said parts results after a short time causing
wobbling or sidewise movement of the needle bar
and needle, said movement being great enough to 30
‘
A still further object of the invention is the pro
vision of a ball joint for connecting the looper
25 frame rocker to the looper frame to prevent lost
motion of the said looper frame due to wear.
Such lost motion is objectionable as the looper in
case there is lost motion present, may at such
times raise or lift up the needle and break same
30 and will often misaline the needle with the loop,
causing slip stitches.
Yet another object is the provision of a split
bearing in the looper frame where the ball joint
connects same with the rocker, together with
3OI
means for tightening same about the ball joint to
take up wear when such wear occurs.
Another object is to produce a device of the
character described in which the maximum sim
4O plicity of construction and operation is secured.
Other objects and advantages will appear as
the nature of the improvements is better under
stood, the invention consisting substantially in the
novel arrangement and co-relation of parts here
45 in fully described and illustrated in the accom
panying drawings, wherein similar reference
characters are used to describe corresponding
parts throughout the several views, and then ?
nally pointed out and speci?cally de?ned and in
50 dicated in the appended claims.
The disclosure made the basis of exemplifying
the present inventive concept suggests a practical
embodiment thereof, but the invention is not to be
_
cause the needle to strike the needle plate or
guard and become bent or broken. To overcome
this undesirable feature, I have provided the
needle bar-yoke with a V shaped cut at the bot
tom thereof which is in constant sliding engage- 35
ment with a rod carried upon a plate which is ad
justably mounted on the machine frame.
The looper frame in such machines slides at its
upper rear forked end upon a pin or stud and is
connected at its lower front end to a rocking 40
mechanism comprising a pivotally mounted rock
er having a stud which ?ts into the looper frame.
Due to wear, the connection between the stud and
frame becomes loose, with the result that the
looper at times will come in contact with the 45
needle, lift same up, bend or break same, and
cause a misalinement of the needle and thread
loop, thus producing a slip stitch. This objec
tionable feature I overcome by providing a ball
joint connection between the rocker and looper 50
frame, such connection having considerably less
wear than the stud connection above referred to.
I further provide means for taking up the wear in
restricted to the exact details of this disclosure, , the said connection by splitting the looper frame
5,5 and the latter, therefore, is to be understood from
at the said connection and by providing a screw 55
2
2,189,879
and nut to tighten the bearing about the ball
- joint.
Referring now to the drawings in detail Ill in
dicates the frame of the machine in which is ro
tatably mounted a drive shaft ll upon which is
secured an eccentric l2 in engagement with the
vertical surfaces l3 and H of a yoke I5 carried
by a needle bar l6 slidingly mounted in the front
and rear walls of the frame Ill. The forward end
of the needle bar I 6 is provided with an extension
I‘! in the lower end of which there is carried the
needle It for sewing the material fed between
the discs l9 and 2b. The said discs are of the
conventional type and are driven in the usual
15 manner by a driving mechanism not shown, as
the said driving mechanism forms no part of the
present invention. A needle plate or guard It
is secured to the supporting stud 22 of the disc l9
by a screw 23.
The lower end of the yoke l 5 is provided with a
wall 26 (see Figs. 1 and 4) in which there is cut a
V shaped groove 25 which is in sliding engage
ment with a similarly shaped top 26 of a rod 2'5
supported at the rear thereof in a plate 28 by
means of a nut 29 on the threaded end'3ll of the
rod 2'5. The plate 28 is secured to the rear wall
of the frame in by means of screws 3i whose di
ameter is somewhat smaller than the clearance
holes 32 to permit of vertical and horizontal ad
justment of the rod 27 with respect to they,
shape groove in the yoke IE to take-up any wear
between the said parts.
I
'
Slidably mounted between ears 35 at the front
of the machine frame It and ears 36 at the rear
, of the said frame is a looper frame 3?! which at
the rear thereof is provided with a bifurcated end
38 in sliding engagement with a stud 39 carried
by the ears 258. A looper 40 is swingably mount
ed in the looper frame 3'7 and is operated for
loop forming in the usual manner by‘ a cam fit
having a cam groove 42 in which rides a cam
roller 43 carried on an arm £43 secured to the
looper dil. (See Figs. 1, 2, 4 and 5).
The lower forward end of the looper frame is
provided with a bearing 45 in which there is
clampingly maintained a bushing 48 forming a
part of a ball joint 87. Besides the said bushing
46 the ball joint comprises a ball portion 48
which is rotatable‘in the bushing 46, and a stud
portion 4d which is screw threadedly maintained
and riveted into the rocker plate or arm 50. A
slotted head Si is provided at one end of the ball
48 so that it may be screwed into the rocker
plate. The rocker plate 50 is secured to a shaft
52 which is swingably mounted in a bracket 53
secured to the front wall of the machine frame
IE1. The looper frame is moved to and fro by
means of an eccentric 54' in engagement with a
bifurcated lower portion 55 of the said looper
frame. In order that any play between the ball
48 and the bushing 46 may be taken up, the looper
frame is provided with a split 56 at the bearing 45
and a screw 51 and nut 58 are utilized to tighten
the said bushing about the ball when wear occurs.
In Fig. 7, I have shown a modi?ed form of my
invention wherein instead of using the V shaped
rod 21, I use a cylindrical or round rod 60 for
slidingly mounting the needle bar-yoke l5.
From the foregoing, it will be seen that I have
70 provided means in both the needle bar-yoke and
the looper frame constructions which will elimi
nate lost motion in the said elements and thus
tend to prevent the breaking or bending of the
needle and at the same time to also prevent slip
stitches.
'
'
Having described by invention what I claim
as new and desire to secure by Letters Patent is:
1. In a sewing machine for fur and the like,
having material feeding discs; a needle bar, a
needle bar-yoke carried by the said needle bar, a
needle guard on one of the said discs, and a main
drive shaft with an eccentric for operating the
needle bar-yoke to move same backward and
forward, a V shaped slideway at the bottom of
the said needle bar-yoke, a rod in engagement 10
with the V shaped slideway forming a lower sup
port for the said yoke, and a plate for adjustably
supporting said rod.
2. In a sewing machine for fur and the like,
having material feeding discs, a frame, a needle '
bar, a needle bar-yoke carried by the said needle
bar, a needle guard on one of the said discs, and
a main drive shaft with an eccentric for operat
ing the needle bar yoke to move same backward
and forward, a V shaped slideway at the bottom 20
of the said needle bar-yoke, a rod in engage
ment with the V shaped slideway forming a lower
support for the said yoke and a plate for support
ing the said rod, the said plate being adjustable
on the machine frame.
,
3. In a sewing machine for fur and the like,
having material feeding ‘discs, a frame, a needle
bar, a needle bar-yoke carried by the said needle
25
bar, a needle guard on one of the said discs, and
a main drive shaft with an eccentric for operat 80
ing the needle bar yoke to move same backward
and forward, a V shaped slidewayat the bottom
of the said needle bar-yoke, a rod in engagement
with the V shaped slideway forming a lower sup~=
port of the said yoke, a plate for supporting the
said rod, the said plate having an upper and a
lower hole, and screws of smaller diameter than
the plate holes for adjustably securing the plate
to the machine frame.
ii. In a sewing machine for fur and the like,
having a looper frame, a looper carried by the
' said frame, and a main drive shaft with a cam
and an eccentric for operating the said looper and
frame, a rocker pivotally mounted at the front
of the machine, a split bearing at the lower front
end of the looper frame, a ball joint connecting 45
the said rocker to the split bearing, the said ball
joint comprising a stud secured to the rocker at
one end, a ball portion at the opposite end, a'
bushing rotatably mounted on the ball portion
and ?tting into the bearing, and screw and nut 50
means for tightening the bearing to press the
bushing closely about the ball.
5. In a sewing machine for fur and the like,
having material feeding discs, a needle bar, a
needle bar- yoke carried by the needle bar, a ,55
needle guard on one of the said discs, a looper
frame, a looper carried by the said looper frame,
and a main shaft with a suitable cam and eccen
tries for operating the respective parts, a V
shaped groove at the bottom of the needle bar
yoke, a rod adjustably mounted for sliding en
gagement with the said V shaped groove, a rock
er pivotally mounted at the front of the machine,
a split bearing at the lower front end of the
looper frame, a ball joint connecting the said 65
rocker to the said split bearing, and means for
tightening the said bearing about the said ball
joint.
6. In a sewing machine for fur and the like,
having material feeding discs, a needle bar, a 70
needle bar yoke carried by the needle bar, a
needle guard on one of the said discs, a looper
frame, a looper carried by the said looper frame,
and a‘main shaft with a suitable cam and eccen
75
2,132,879
tries for operating the respective parts, a V
shaped groove at the bottom of the needle bar
yoke, a rod adjustably mounted for sliding en
gagement with the said V shaped groove, 'a rocker
pivotally mounted at the front of the machine, a
split bearing at the lower front end of the looper
frame, a ball joint connecting the said rocker to
the said split bearing, the said ball joint com
prising a. stud secured to the rocker at one end,
10 a ball portion at the opposite end, a bushing ro
tatably mounted on the ball portion and ?tting
into the bearing, and screw and nut means for
tightening the bearing to press the bushing
closely about the ball.
3
7. In a sewing machine for fur and the like,
having material feeding discs, a needle bar, a
needle bar yoke carried by the said needle bar,
a needle guard on one of the said discs, and a
main drive shaft with an eccentric for operat
ing the needle bar yoke to move same backward
and forward, a V shaped slideway at the bot
tom of the said needle bar-yoke, a rod adjust
ably mounted with respect to the V shaped
groove, and a V shaped upper portion on the said 10
rod for sliding engagement with the V shaped
groove in the yoke.
CAESAR BONIS.
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