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J. GALKIN
\ July 22, 1947.
2,424,391
THREAD SEVERING MECHANISM FOR SEWING MACHINES
-
Filed Sept. 7. 1946
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JOSEPH GALKIN
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INVENTQR.' '
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. ATTQRNEY
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2,424,391
THREAD SEVERING MECHANISM FO'H‘ SEWING MACHINES
Filed Sept. 7, 1946
4
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13
40
3 Sheets-Sheet `3
' JOSEPH GALKI'Nv
INVENTOR.
'
ATTORNEY
Patented July 22, 1947
2,424,391
UNITED STATES PATENT OFFICE
2,424,391
THREAD SEVERING MECHANISM FOR
SEWING MACHINES
Joseph Galkin, New York, N. Y.
.
Application september 7, 1946, seria1Ne.695,461
3 Claims.
(c1. i12-_252)
1
2
The invention relates to thread-severing de
vices for sewing machines for severing the chain
in Figure 3, with the slidably mounted blade in
ing thread between successively stitched articles.
Figure 5 is a cross-sectional view of the at
tachment, the section being taken as on line
cutting position.
This invention comprises covered and concealed
complemental thread-severing blades disposed
5--5 in Figure 2 and showing the blades in cutting
crosswise of the line of seam formation, the
position.
thread-severing blades being continuously actu
Figure 6 is an end view of the attachment, in
combination with a portion of the sewing ma
An object of this invention is to provide an at
chine,v showing a cam for operating the slidably
tachment particularly adapted for an overseam 10 mounted blade.
Figure 7 is a plan view showing the attachment
ing sewing machine which will sever the chaining
in operating position with the needle-plate of the
threads at the end of a sewing operation without
sewing machine.
requiring that the operator handle a pair of
scissors.
Figure 8 is a fragmentary front View of the
ated during the operation of the machine.
Another object of this invention is to provide
a thread-severing attachment fixed to the frame
of the sewing machine rearwardly of the point
of steam formation and including a bracket hav
ing a hollow head positioned rearward of the feed
dog, the head having a horizontal groove lower
than the upper surface of the head and positioned
1,5
attachment, the lever and the slidable blade being
removed.
Y
'
Figure 9 is a plan view of a flxed blade.
In the illustrated embodiment of the invention
the numeral IIJ indicates an overseaming machine
comprising a, curved eye-pointed oscillatory needle
I I, a frame I2, and a needle plate I3. The feed
ing mechanism includes a feed-dog I 4, adapted
to be actuated by eccentrically driven members
of sufficient depth to permit the chaining thread
to drop therein.
mounted on a main shaft I5, as is well known
Another object of this invention is to provide 25 in the sewing machine art.
The trimming attachment I6 comprises an elon
a slidably mounted thread-severing blade coacting
gated bracket I'! having an aperture IB. As
with a fixed cutting blade, the slidable blade be
in alinement with the line of seam formation and
shown in Figure 1, a screw I9 passing through
ing movable across the line of seam formation
and adapted to sever the chaining thread and to 30 the aperture I8 in the bracket Il secures the
trimming attachment I6 to a horizontal portion
provide spring means normally biasing the slid
20 of the frame I2. A dowel pin 2I fixed in the
ably mounted blade into a retracted position and
bracket I1 aligns the bracket.
a cam on the main shaft bringing the slidably
The trimming attachment I6 is positioned rear
mounted blade into cutting position.
ward
of the feed-dog I4. The free end portion
Another object of this invention is to provide
35 of the bracket I'I adjoins the feed-dog I4 and
passage means in the head near the cutting posi
terminates in a head member 22, which is of
tion of the cutting blades to facilitate the re
generally rectangular form. The head member
moval of the cutting chips from the cutting blades.
22 has a groove 23 with a semi-circular bottom.
With the above and other objects in view, the
The upper face of the head member 22 is posi
invention will be hereinafter more particularly 40 tioned
above the upper surface of the bracket I ‘I
described, and the combination and arrangement
and above the upper surface of the needle plate
of parts will be shown in the accompanying draw
I3. The groove 23 is positioned in alinement with
ings and pointed out in the claims which form
the
line of seam formation of the sewing machine.
part of this specification.
The head member 22 comprises a fixed blade
Reference will now be had to the drawings, 45 24 which is secured in the head member 22 by
wherein like numerals of reference designate cor
screws 26 threaded in the head member 22. As
responding parts throughout the several views, in
shown in Figure 2, the ñXed blade 24 has a cut
which:
out portion 21 in alinement with the groove 23
Figure 1 is an end view of an overseaming sew
and a bevelled cutting edge 24’.
ing machine, having the attachment applied 50. The head member 22 terminates at its lower
thereto.
Figure 2 is a plan View of the attachment.
Figure 3 is an end view of the attachment, with
the slidably mounted blade in retracted position.
Figure 4 is an end View similar to that shown 5
elevation in an arm 3l having a threaded aper
ture 32 for a screw 33. In the head member
22 is a cavity 34 of shallowv depth and of cir
cular cross-section for partially supporting a coil
spring 35.
‘
3
2,424,391
Coacting with the head member 22 is a hollow
head member 22’ having a recess 31 for a slid
able blade 25 having a bevelled cutting edge 25’.
The head member 22’ has a cavity 38 of cir
cular cross-section which provides the remainder
portion to the cavity 34 for the spring 35. The
4
I claim:
1. In a sewing machine of the class described,
comprising a frame, a main shaft, a needle-plate
and a feed-dog; a thread severing attachment
fixed to said frame rearwardly of the point of
seam formation for severing the chaining thread
between successively stitched articles, including
a bracket having a hollow head positioned rear
40 is movably mounted and actuates the movable
ward> of said feed-dog, said head having a hori
blade 25. The lever 4S is pivoted on the screw 33.
The head member 22’ has a laterally extend 10 zontal groove positioned in alinement with the
ing free edge portion 42 which covers the recess
line of seam formation and of a depth permitting
31 and this serves to guide the fabric out of
said chaining thread to drop therein, a cutting
the field of movement of the slidably mountedl
blade fixed in said head and having a cut-out
blade 25. The fabric passes over the cutting
portion in alinement with said groove, a thread
blades without being damaged thereby.`
15 cutting blade slidably mounted in said head and
The upper surface 42 of the head member 2'2’
coacting with said fixed cutting blade, said slida
is considerably higher than the upper surface of
ble cutting blade being movable across the line
the needle plate I3 in order to facilitate the
of seam formation into cutting engagement with
dropping of the chaining thread into the groove
said fixed blade and adapted to sever said chain
23.
ing thread, spring means normally biasing said
The fabric being stitched moves over the upper
slidably mounted blade into a retracted position,
surface 42 of the head member 22’ and when
a' camon said main shaft, a lever pivotally mount
the finished end of the fabric reaches the front
ed on said head and operatively associated with
of the head, the chaining thread drops down into
saidcam for bringing said slidably mounted cut
the groove 23. The chaining thread then lies 25 ting blade into cutting position, the upper portion
within the field of movement of the slidably
ofA said' head having a lateral extension of a width
head member 22’ has a slot 39 in which a lever
mounted blade 25 and is severed.
_
designed to cover and conceal said slidable cutting
For the purpose of actuating the slidably
blade and protect the articles being stitched from
mounted blade 25 I provide an open face type
damage thereby.
cam 45 which is suitably secured at' one end 30
2, In. a chain-thread sewing machine, compris
of the main shaft l5. The cam imparts cut
ing a frame, a» main shaft, a needle-plate and a
ting movements to the slidable blade under all
feed-dog; a thread severing attachment fixed to
conditions of stitch formation. One end of the
said frame for severing the chaining thread be
coil spring 35 reacts against the rear wall of the
tween successively stitched articles, including a
cavity 3¢l while the other end of the spring 35 bracket having a hollow head positioned rearward
presses against the slidable blade 25. The spring
of said feed-dog, said head having a horizontal
serves to normally bring the slidably mounted
groove positioned inr alinement with the line of
blade into a retracted position while the »cam
seam formation, said groove extending down to
brings the slidably mounted ‘blade into cutting
said needle-plate for said chaining thread to drop
position. It is to be noted that the cam 45 has 40 therein,- afcutting blade fixed in said hollow head
and having> a cut-out portion in alinement with
a threaded boss ¿i3 which serves similar to a
threaded nut for engaging a thread on the
said groove, a cutting blade slidably mounted in
said head and coacting with said fixed cutting
shaft'l5.
blade, said slidable cutting blade being movable
In order to coordinate the movement of the
garment sections successively into proper sever 45 across the line of seam formation into cutting
engagement with said fixed blade and adapted
ving position, I provide a vertical edge guide wall
to sever said chaining thread, spring means nor
dit» at the rear of the head against which the
mally biasing said slidably mounted blade into a
superposed edge portions of the fabric sections
retracted position, a cam on said main shaft, a
abut while being sewed.
It is to be noted that the chain thread sewing 50 lever pivotally mounted on said head and opera
tively connected With said cam for bringing said
machine herewith shown is shown only for illus
slidably mounted cutting blade into cutting posi
tration and that my invention is applicable to
tion, the upper portion of said head having a lat
many other chain thread sewing machines.
eral extension of a width designed to cover and
It is also to be noted that while in the sewing
conceal said slidable cutting blade and protect
machine herewith disclosed, the thread severing
the' articles being stitched from damage thereby.
device is driven from a cam' on the main shaft,
3. In a chain-thread sewing machine, compris
that the device may be driven from other mov
ing a frame, a main shaft, a needle-plate and a
able members available on different sewing ma
feed-dog; a thread severing attachment fixed to
chines.
60 said frame for severing the chaining thread be
A's shown in Figure 5, I have provided a
tween successively stitched articles, including a
through opening 50 in the vertical edge guide
bracket having a hollow head positioned rearward
wall 44 in alinement with the cutting blades.
of said feed-dog, said head having a horizontal
The opening 50 provides passage means in the
groove positioned in alinement with the line of
head at the cutting position of the cutting blades 65 seam formation, said groove extending down to
which causes automatic removal of the cutting
said‘needle-plate for said chaining thread to drop
chips from the cutting blades and maintains the
therein, a cutting blade fixed in said hollow head
blades in proper operating condition.
and having a cut-out portion in alinement with
In accordance with the patent statutes I have
said groove, a cutting blade slidably mounted in
described and illustrated the preferred embodi 70 said; head and coacting with said ñxed cutting
ment of my invention, but it will be understood
blade, said slidable cutting blade being movable
that various changes and modifications can be
across the line of seam formation- into cutting
made therein without departing from the spirit
engagement with said fixed blade andv adapted to
of the invention as defined by the appended
seversaidichaining thread, spring means normally
claims.
75 biasing said slidably mounted blade into a re
2,424,391
\
è
5
tractecl position, and means for bringing said
slidably mounted cutting blade into cutting posi
REFERENCES CITED
tion, the upper portion of said head being solid
The following references are of record in the `
and having a lateral extension of a Width designed
5 ñle of this patent:
to cover and conceal said slidable cutting blade
and protect the articles being stitched from dam
age thereby, said head having passage means in
alínemen't with said cutting blades for automatic
removal 01° cutting chips therefrom.
JOSEPH GALKIN.
Number
10
UNITED STATES PATENTS
Name
Date
1,170,349
Seymour ___________ __ Feb. 1, 1916
1,841,102
Fìñeld _____ __'_ ____ __ Jan. 12, 1932
2,342,285
Knaus ____________ __ Feb, 22, 1944
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