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Патент USA US2067965

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Jan. '19, 1937.
2,067,965
D. w, Kl'iAu
THREAD CUTTING MECHANISM
.
Original Filed 'Feb. 24, 1933
2 Sheets-Sheet 1
IN\_IENTOR
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ATTORNEY
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Jan. 19, 1937.
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2,067,965
D. w. KLAU
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THREAD CUTTING MECHANISM
Original Filed Feb. 24, 1933
2 Sheets-Sheet 2
INVENTOR
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Patented Jan. 19, 1937
2,067,965 '
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2,067,965
THREAD CUTTING MECHANISM
David W. Klan, New York, N. Y.
Original application February 24, 1933, Serial No.
658,367. Divided and this application October
31, 1933, Serial No. 695,969
7 Claims.
(Cl. 112-252)
This invention relates to a duplex sewing ma
chine adap-ted for the making of two parallel
lines of stitching simultaneously.
While this invention is particularly adapted
5. for the hemming of the opposite parallel sides of
a roller shade or the like, it will be obvious that
it may be employed in other relations as well.
The present invention is in the nature of an
right angular cross section, ordinary commercial
angle irons as illustrated being well adapted to
the purpose. These longitudinal members are
arranged with vertical ?anges depending and
spaced apart, the horizontal ?anges projecting
outwardly in opposite directions. End connect
ing members as 4 and 5 extend between and con
nect the longitudinal members 2 and 3.
Fixed to the inner surfaces of the vertical
improvement upon the machines disclosed and.
?anges of the longitudinal members 2 and 3 re 10
10 claimed in my patents numbered 1,578,324; March
30th, 1926, and 1,608,944, November 30th, 1926; spectively are strips 8 and. 9, the upper longi
tudinal edge surfaces of which are spaced down
the present application being a division of appli
cation Serial No. 658,367, ?led February 24th, 7 wardly a slight distance below the upper sur
face of the horizontal ?anges of said longitudinal
1933.
members thereby to form angle recesses as It
An object of the present invention is to pro
15
and H which collectively de?ne a run-Way lon
vide an ef?cient thread cutting mechanism.
A further object is to provide improved cutting gitudinally of the machine adapted to slidably
means for the thread which extends from one receive and support the two sewing machine ele
ments as G and H, said sewing machine elements
window shade or the like to another.
having bed plates as i2 and I3 respectively, the 20
A further detailed object is to provide a prac
20
tical and ef?cient thread cutter having no 00
opposite longitudinal edge portions of which rest
operative metallic shearing edges.
slidably in the angle recesses iii and H so that
said machines may be slid easily toward and away
from each other along the run-way.
A further object is to- provide efficient oper
ating mechanism for the blade or blades em
ployed.
Other objects and aims of the invention, more
or less speci?c than those referred to above, will
be in part obvious and in part pointed‘ out in the
course of the following description of the ele
30 ments, combinations, arrangements of parts and
applications of principles constituting the in
vention; and the'scope of protection contemplated
will be indicated in the appended claims.
In the accompanying drawings Which are to be
35 taken as a part of this speci?cation, and in which
I have shown merely a preferred form of embodi
ment of the invention:
Fig. 1 is a top plan View of a machine con
structed in accordance with this invention.
Fig. 2 is a vertical sectional view of the upper
40
portion of the machine, said section being taken‘
approximately upon the plane of line II-—II of
Fig. 1 and looking in the direction of the arrows
45
on said line, and
Fig. 3 is an enlarged vertical sectional View of
the thread cutting mechanism and associated
parts, the section being taken on the plane of
line III-III of Fig. 1.
'
Referring to the drawings for describing in de
tail the exemplary structure which is illustrated
therein, the reference character L indicates a
main frame comprising a top or table portion
having suitable legs as I—l.
The top or table portion illustrated consists
of two longitudinal members as '2 and 3, each of
Any suitable means may be provided by which 25
to operate the two sewing machines or for mov
ing them back and forth along their run-way
so as to operate upon di?erent widths of work,
such for instance the means shown in the parent
application.
DU
The sewing machines G and H are reversely
positioned, that is they are arranged so that they
face toward each other.
The two sewing machines are thus adapted for
running lines of stitching simultaneously in the 35
same direction along a single piece of goods, as
ior instance a piece of window shade cloth as 40,
moving transversely across the table as indicated
in Fig. 1.
The shade material 46 may be carried as a roll, 40
as indicated at 4|, in brackets as 42 and 43 ?xed
to and movable with the sewing machines G and
H respectively, the material being thus con
veniently held so that it may unwind from the
roll and pass directly beneath the stitching heads 45
of the two sewing machines.
A particular purpose of the machine is that
of stitching hems as 44—t4 at the opposite lon
gitudinal edge portions of window shades and
the like. In this instance a number of separate 50
pieces of window shade material are wound into
a single roll M. After one piece has passed be
neath the stitching heads of the sewing machines
G and H the operator feeds along behind it the
next piece from the roll M, and this operation 55
2
2,067,965
is repeated as the stitching of the successive pieces
proceeds.
Always a space of an inch or two occurs be
tween the succeeding pieces of window shade
material.
The stitching threads continue across
this space and must be severed so that the
hemmed shades may be separately handled in the
As a suitable means for quickly, simultaneously
10 and surely cutting the stitching threads between
successive window shades the machine includes
the pair of thread cutters as d5—45 with which
the present invention is more particularly con
cerned, said thread cutters being constructed and
15 operated as follows:
25
30
35
40
tions of the bar, springs as ??—-6U being carried 1
by the guide rods positioned beneath the hori
subsequent operations of completing them.
. The two thread cutters A5 are identical.
and yet be free for vertical, or thread cutting,
movement at all times.
The horizontal bar 5| is ?oatingly supported
to move readily up and down along a pair of
guide rods 58-—58 which extend loosely through
apertures 59-59 formed in the opposite end por
Each
includes a body portion 45 having a pendant in
termediate web part as M to which is attached
a sharp cutting blade as 48, for instance a safety
razor blade. A carrying stem 559 projects down
wardly through a slot as it formed longitudinal
1y through the horizontal ?ange of the table
forming member 3 and into ?xed sliding con
nection with a horizontal bar 55 mounted for
parallel vertical movement in the space beneath
the horizontal ?ange of said table member, the
two thread cutters being mounted upon the same
bar 5|, one adjacent one end of said bar and the
other adjacent the opposite end of said bar, and
the arrangement being such that a downward
vertical movementof the bar will cause the cut
ting blades 48-£l8 of the two thread cutters to
move simultaneously downwardly through the
slots 59, as illustrated particularly in Fig. 3.
Each thread cutter includes two separate
presser feet as 52 and 53 carried by the body 46
one at the forward side of the cutting blade and
the other at the rear side of the cutting blade.
These presser feet are yieldably mounted, as by
being carried upon supporting rods as 54-54
vertically slidable through the body 46, compres
sion springs as 55 engaging about said rods and
serving to urge the presser feet downwardly but
affording opportunity for continued downward
45 movement of the body when downward move
ment of the presser feet is obstructed by engage
ment against the top horizontal surface of the
frame or table member 3.
Suitable connecting members, as indicated at
50 li$—5?, extend between the sewing machines G
and H respectively and the adjacent thread cut
ters operable to cause sliding movement of the
thread cutters along the horizontal bar 5| corre
sponding with all longitudinal adjustments of the
55 sewing machines along the table, and the dispo
sition of the thread cutters is such that the cut
ting blades and the presser feet of the thread
cutters stand always in alignment with the stitch
ing threads as said threads issue from the sew
ing machines respectively and move along with
the work, the position of the two thread cut
ters with respect to the two sewing machines and
the work being substantially as illustrated in
Fig. 1.
65
Suitable guide members til are comprised in
the sewing machines adapted to be engaged by
marginal portions of the passing work so as to
guide the work with respect to the stitching
needles and the thread cutters.
The connecting members 55—56 are ?xed to
the sewing machines and engage slidably within
vertically extending slots 6d of the thread cut
ters so that the thread cutters will move adjust
75 ably along the table with the sewing machines
zontal bar, and other, relatively lighter, springs
6 I—6l being carried by the guide rods positioned 10
above the horizontal bar, all of said springs press
ing yieldingly against the bar and serving col
lectively to hold the bar in a normal relatively
elevated position.
A foot treadle as 62 is provided and a suitable
connecting frame as 63 extends between this
treadle and the opposite end portions of the hor
izontal bar in such wise as to cause a horizontal
downward movement of the bar bodily against
the compression of the springs 6ll—60 whenever 20
the treadle 62 is depressed, the shape of the con
necting frame 63 and the manner of attaching
it to the horizontal bar being such as to apply
equal downward pull against the opposite end
portions of the horizontal bar, and to leave the 25
intermediate portion of the horizontal bar free
and unobstructed for longitudinal sliding move
ment of the thread cutters at the will of the
operator.
The manner of operating the thread cutters 30
is simple: The operator, noting that the work has
moved along so that the end of a completely
stitched piece of work has just passed the thread
cutters and that only the loose threads extending
from this ?nished piece to the next succeeding 35
piece are stretched across the slots 59 beneath the
cutting blades 43-48 and presser feet 52 and
53, suddenly presses down the foot treadle 62 so
as to move the two thread cutters simultaneous
ly downwardly. The presser feet normally stand
in a horizontal plane slightly below the cutting
edges of the cutting blades, as shown by full lines
in Fig. 3, so that as the thread cutters move down
wardly said presser feet ?rst engage the threads
and co-operate to clamp the threads at opposite
sides of slots 50 against the top surface of the
table member 3 thereby gripping and holding the
threads stretched across the slots 53.
The con
tinued downward movement of the cutting blades
causes the blades to pass through and sever the .
threads where the threads span the slots.
The severing of the threads at opposite margins
of the work is thus accomplished instantly and
with perfect reliability, and the operation is
fully under the control of the operator.
Instantly the foot pressure is moved from trea
dle 62 the springs 683—EIJ snap horizontal bar 5!,
and consequently the two thread cutters, upward
again to their normal position free of the pass
ing work, the springs 6l-6l serving at this time 60
to cushion the upward movement of the horizon
tal bar.
While the mechanism herein shown and de
scribed shows both of the sewing machines G and
H, and associated parts, to be adjustably movable
longitudinally of the table, it will be understood
that if desired one of the machines and its as
sociated parts may remain stationary, and even i
be made without ability for adjustment if de
sired, the other sewing machine alone, with its 70,
associated parts, being in that case moved to pro
vide the requisite spacing of the two sewing ma
chines longitudinally of the table.
The entire mechanism is simple, substantial,
durable and practical. The operator has merely 75
3
2,067,965
to adjust one or both of the sewing machines
having a slot formed therethrough extending
to properly operate upon the particular width of
goods to be hemmed, then proceed to feed the
transversely of the path of movement of the
work, and a thread cutting device also disposed
in the path of movement of the work, said thread
cutting device including a pair of yieldingly
mounted presser feet one disposed at each side
of said slot, means to move said presser feet into
and out of clamping engagement against the
parts of said table element at opposite sides of
work from roll 4| across the table through the
guide devices 51-51 and periodically snap down
and release the treadle 62 to sever the stitching
threads between the pieces of work as they are
successively completed.
The guide devices 51-51 are important.
Be
10 ing carried by and movable with the respective
said slot respectively adapted thereby to clamp 10
sewing machines, they not only guide the work ac
curately with respect to the two. sewing needles
and the two thread cutters, but they also always
insure that the roll 4! of the work is properly
15 centered longitudinally with respect to the two
brackets 42 and 43 which support the roll of
and hold against endwise movement a stitching
thread extending in otherwise unsupported rela
tion between them across said slot, and a single
thread cutting blade arranged in the space be
tween said presser feet movable into and out of 15
said slot and hence into severing engagement
with the unsupported portion of thread extend
work.
.
The top surface of the table member 3, where
the presser feet engage, as at 65, may be rough
20 ened if desired, and the under surfaces of the
presser feet may be matingly roughened, or may
be formed of a yielding material 'such as rubber,
so as to more eiliciently frictionally grip and hold
the threads against endwise sliding when the
25 cutting blades are pressed against the threads.
As many changes could be made in this con
struction without departing from the scope of
the invention as de?ned in the following claims,
it is intended that all matter contained in the
above description, or shown in the accompanying
drawings, shall be interpreted as illustrative only
and not in a limiting sense.
Having thus described my invention, what I
claim as new and desire to secure by Letters
35
Patent
is:——
w
1
1. A thread cutting device for sewing ma
chines, comprising a pair of presser feet spaced
apart and movable into and out of clamping en
gagement against spaced parts of the sewing
machine structure and adapted thereby to clamp
and hold against endwise movement a thread
extending in otherwise unsupported relation be
tween them, and a single thread cutting blade
arranged in the space between said presser feet
movable to engage and sever the unsupported
portion of thread extending between said presser
feet, together with means for operating said
presser feet and cutting blade.
2. A thread cutting device for sewing machines,
comprising a pair of presser feet spaced apart
and movable into- and out of clamping engage
ment against spaced parts of the sewing machine
structure and adapted thereby to clamp and hold
against endwise movement a thread extending
in otherwise unsupported relation between them,
a single body member by which said presser feet
are carried, yieldable connecting means between
said presser feet and said body member permit
ting movement of the body member independent
60 ly of the presser feet, a single thread cutting blade
arranged in the space between said presser feet
carried by and movable with said body member
to engage and sever the unsupported portion of
thread extending between’ said presser feet, and
means for operating said body member.
3. In a sewing machine device comprising a
table element along which stitched work may
move from a sewing machine, said table element
ing across said slot.
4. In a sewing machine device comprising a
table element along which stitched work may 20
move from a sewing machine, said table element
having a slot formed therethrough extending
transversely of the path of movement of the
work, and a thread cutting device also disposed
in the path of movement of the work, said thread 25
cutting device including means operable to grip
and hold a thread stretched across said slot and
a single cutting blade to sever said stretched
thread at a point removed from the sides of the
30
slot.
5. In a sewing machine device comprising a
table element along which stitched work may
move from a sewing machine, said table element
having a slot formed therethrough extending
transversely of the path of movement of the 35
work, and a thread cutting device also disposed in
the path of movement of the work, said thread
cutting device including means operable to hold
a thread stretched across said slot and to sever
said thread at a point spaced intermediate the 40
opposite walls of said slot.
6. In a sewing‘ machine device comprising a
table element along which stitched work may
move from a sewing machine, said table ele
ment having a slot formed therethrough extend- ~
ing transversely of the path of movement of the
work, and a thread cutting device also disposed
in the path of movement of the work, said thread
cutting device including a single cutting blade
movable into said slot to sever a thread at a ‘
point spaced intermediate the opposite walls of
said slot, the thread being unsupported between
the sides of the slot during the cutting opera
tion.
'7. In a sewing machine device comprising a 55
table element along which stitched work may
move from a sewing machine, said table element
having a slot formed therethrough extending
transversely of the path of movement of the
work, and a thread cutting device also disposed 60
in the path of movement of the work, said thread
cutting device including a single keen blade oper
able by movement toward said table to sever at a
point intermediate the opposite walls of said slot
a thread stretched across said slot, the thread
being unsupported between the sides of the slot
during the cutting operation.
DAVID W. KLAU.
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