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Патент USA US3087458

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April 30, 1963
c. F.1F1TZGERALD ETAL
3,087,448
THREAD SEVERING
Original Filed Feb. 8, 1957
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2 Sheets-玈heet 1
April 30, 1963
c. F. FITZGERALD ET AL
3,087,448
THREAD SEVERING
Original Filed Feb. 8, 1957
2
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�34, ,28 35
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2 Sheets-Sheet 2
United States
arent
yCC
3,087,448
Patented Apr. 30, 1963
1
2
3,087,448
THREAD SEVERING
Charles F. Fitzgerald, Beverly, and Arthur .1. Murphy,
Saugus, Mass., assignors to United Shoe Machinery
cutting devices suitable for severing the needle thread
outside Ithe shoe in McKay type shoe sewing machines
are disclosed in United States Letters Patents No. 495,
542 issued April 18, 1893 on an application in the name
Corporation, Flemington, NJ. and Boston, Mass., a
of V. P. Buck and No. 1,255,489 issued February 5, 1918
corporation of New Jersey
on an application in the name of I. Triem. Neither of
Original application Feb. 8, 1957, Ser. No. 638,986, now
these devices, however, is readily modifiable for severing
Patent No. 2,979,001, dated Apr. 11, 1961. Divided
the leading end of the needle thread inside the shoe.
and this application Dec. 3, 1959, Ser. No. 856,955
It is accordingly an object of the present invention
6 Claims. (Ci. 112-252)
10 to provide thread severing means in a McKay type shoe
The present invention relates generally to improvements
sewing machine for severing the leading end of the needle
in lockstitch shoe sewing machines of the McKay type,
thread inside the shoe after the insertion of the seam has
having rotatably mounted shoe entering horns similar to
been initiated.
those disclosed in Uni-ted States letters Patent No. 1,885,
It is another object to provide means for severing the
927 granted November 1, 1932, upon an application of 15 leading end of the needle thread without endangering the
B. T. Leveque, and No. 1,914,936 granted June 20, 1933
operator by exposing him to severe cuts and without
on application of F. Ashworth. More particularly, the
increasing the likelihood of damage to the shoe being
invention relates to thread trimming devices especially
operated upon.
useful in McKay type shoe sewing machines.
It is a further object of the invention to provide thread
The present application is a division of application
Serial No. 638,986, 駆ed February 8, 1957, now Patent
No. 2,979,001, granted April 11, 1961. In addition to
the present invention the parent application also discloses
a driving and stopping mechanism for causing the shuttle
severing means supported upon the horn of a McKay
type shoe sewing machine in such a way that it can be
readily and quickly removed for replacement or resharp
enin
.
Itgis a still further object to provide a thread severing
to remain in motion after the needle has stopped in order 25 blade which may be readily mounted upon the horn of a
to set the last stitch of the seam. Also included in the
parent application is an improved shuttle driving means
now the subject matter of application Serial No. 861,669,
tiled December 23, 1959.
McKay type shoe sewing machine Without increasing the
size of the drive and whirl enclosing portion of the horn
which o-f necessity must enter the shoe. Yet another
object is to provide thread severing means mounted upon
In 籺he manufacture of a McKay type shoe a seam is 30 the horn which is effective only after the insertion of the
inserted through the ou-tsole, the inturned margin of the
seam has started so as to prevent displacement of Ithe
upper and the insole. This operation can be performed
satisfactorily only by a machine having a shoe entering
needle thread in the shoe as the thread is severed. A
more general object is to provide a novel and useful
and supporting horn. At the start of the operation, a
method of severing thread.
length of several inches of thread is withdrawn through 35
In the achievement of the foregoing object a feature
the needle threading whirl at the tip of the horn and is
of the invention resides in the combination of a shoe sup
held by the operator as the shoe is placed in inverted posi
porting horn of generally conventional configuration, in
tion upon the horn for the start of the seam. The reason
for withdrawing and holding the thread is to prevent the
cluding a whirl-covering cap with a blade supported on
the side of the horn tip in close proximity to the whirl.
needle 籪rom missing the thread on the 駌st stitch and the 40 The blade is formed with an integral tang which enters
whirl from being unthreaded by the subsequent action of
a slot in the cap. The cutting edge of the blade is posi
the take-up.
tioned in a slight shielding recess near the whirl. The
The seam in a McKay type 縮hoe is generally inserted
thickness of the blade is controlled with su駃cient accuracy
about the entire periphery of the shoe, the beginning of
that it 駎s snugly between the horn structure and a sur
the seam being overlapped a few stitches by .the end of 45 face of the cap thereby stiifening the blade and assisting
the seam. It often happens that the leading end of the
in preventing lateral movement of the cap.
needle thread which remains dangling and uncontrolled
on the inside of the shoe is picked up at the end of the
The foregoing objects and features of the present inven
tion will become apparent from the following detailed
description taken in connection with the accompanying
seam by the needle. The uncontrolled leading end of
the thread then tangles with the thread coming directly 50 drawings in which,
from the whirl with the result that the needle is often
FIG. 1 is a view in side elevation of a McKay shoe
broken, machine adjustments may be disturbed and in
sewing machine in which the present invention may con
some cases the machine may be seriously damaged.
Usually the shoe being operated upon is irreparably dam
veniently be embodied;
FIG. 2`is a detail plan view on an enlarged scale of
55 the tip of the shoe supporting horn including a thread
aged with a consequent loss of materials and labor.
yIt has long been considered desirable to sever lthe excess
trimming knife according to the present invention;
thread after the seam has started in order to avoid these
FIG. 3 is a detail view in perspective of the thread
odjectionable results. However, in order to cut the thread
trimming knife included in FIG. 2;
with a hand held tool it is necessary to interrupt the sew
FIG. 4 is a detail view in front elevation and partly
ing, raise the presser foot, remove the shoe fro-m the horn, 60 in cross section showing the manner in which the thread
and sever the thread either with an especially formed
trimming knife is employed; and
thread outing instrumentiality or with a conventional
FIG. 5 is a section through the shoe supporting horn
knife in a very awkward position. Such a procedure is
illustrating the mounting of the thread trimming knife
upon it.
- ?
both time consuming and costly and results in a substan
The illustrated machine described in greater detail in
tional reduction in production. It is also objectionable
because by being forced to handle a sharp instrument
the above-identified parent application serves as a setting
frequently in the performance of his duties, the sewing
for the present invention but contains many novel features
machine operator is exposed .to undue risks of severe
lacerations.
_
The alternative to a hand held tool is a thread severing
instrumentality included as a part of the machine. Thread
not necessary `to cooperate with the present thread sever
ing device which may be applied with equal facility to a
70 plurality of McKay shoe sewing machines of either the
lockstitch or chain stitch types, including those of the
patents already indicated. The present invention will be
3,087,448
3
fully understood from a general description of the asso
ciated machine which includes, as shown in FIG. 1, a
shoe entering and supporting rotary horn 2 and a sewing
head indicated generally at 4. Included in the sewing
head are stitch forming devices comprising a straight
hook needle S and a shuttle more fully described in the
parent application and indicated at 6, for passing loops
of needle thread about the locking thread in the formation
of the seam. For `feeding the work piece the sewing
head includes a feed point 7 actuated by mechanism
similar to those described in the above identified patents.
Mounted at the base of the machine is a mo-tor 8 for
driving the power actuated parts through a treadle con
trolled ydriving and stopping mechanism indicated at 9.
A main vertical drive shaft 10 is interposed between lthe
output of the driving and stopping mechanism 9 and the
driven parts located in the sewing head 4 and in the horn
2. A needle threading whirl 12 mounted in the tip of the
4
tention of the horn at the blade side toward the whirl
reinforces the blade and also prevents lateral looseness
Aof the cap.
At the start of a seam a length of thread is withdrawn
from the tip of the horn and held in the hand of the
operator for ythe insertion of the `first few stitches which
secure the thread to the work piece. After two stitches,
for example, have been inserted, the iirst stitch hole and
hence, the point of exit `of the leading end of the thread
from the work piece, has progressed to a point designated
by the reference numeral 33 which point is beyond the
cutting edge of the blade 26. Since the dangling leading
end of the thread has been pulled downwardly against
the knife supporting side of the horn, the thread is auto
matically directed by the guiding surfaces of the horn
into a position of engagement with the blade which is
hidden from the view of the operator by the shoe itself,
in which position it is shown in FIGS. 2 and 4. The op
erator then applies additional tension to the .thread which
horn 2 is driven from the main shaft 10 through a series
of interconnected shafts 14, 16, 18 and 20. The shaft 20 20 is thereby severed. It will 籦e appreciated that although
the cutting edge of the blade 26 has been described as
is journaled in the upper end of the horn, as shown in
located somewhat less than two stitch lengths along the
FIG. 5, and bevel gear teeth formed at its upper end are
line of the seam away from the axis of the whirl, the in
in mesh with teeth on the whirl for driving the latter to
vention is not intended to be so limited. It is preferable,
thread the needle in the usual manner of rotary whirls
when applied to McKay type shoe sewing machines. It 25 however, in order to achieve adequate securement of the
thread to the work piece, that two stitches be inserted
will be appreciated from FIG. 5, that the presence of mov
before the thread severing tension is applied to the thread.
ing parts in the tip of the horn 2, the size of which must
The nature yand `scope of `the invention having been in
be maintained at a minimum in order to fulfill its re
dicated and an exemplary embodiment having been de
quired function, presents severe difficulties in the mount
scribed in detail, what is claimed is:
ing of additional apparatus in close proximity to the
1. A shoe sewing machine including a rotatably
whirl.
mounted shoe-entering horn formed with a work sup
A modified whirl retaining cap >22 perforated at 23 is
porting surface and with a recess close to the surface,
secured on the tip of the horn by the screw 24 for con
fining the whirl and for providing a work engaging upper 35 work feeding devices, stitch-forming and setting devices,
including a straight hook needle, in combination with
surface. In some respects the present horn tip portion of
a thread end trimming knife mounted within the recess
the machine is similar to that disclosed in United States
and located `below the work supporting surface of the
Letters Patent No. 1,931,917 granted October 24, 1933,
horn, at least one stitch length beyond the needle to
upon application of Fred?Ashworth, but in other respects
the addition of a thread severing blade or knife 26 to the 40 sever the thread within a shoe after the first stitch of
a seam has been fed by the feeding devices at least one
horn requires a novel arrangement now to be described.
stitch past the needle.
Both the horn tip proper and the cap 22 have been
2. A sewing machine having a rotatably mounted shoe
modified in contour as seen in FIG. 2, to provide a shal
entering horn formed with a needle receiving opening
low recess 28 into which -the cutting edge of the blade 26
at its tip, a straight hook needle alined with the needle
projects. The horn and cap surfaces defining the recess
28 are spaced from the blade 26 a distance slightly greater 45 receiving opening in the horn, a needle threading Whirl
within the opening of the horn, a perforated cap having
than the maximum diameter of thread to be employed
a work supporting surface and an attached tongue
in the machine and additionally the horn and cap sur
secured to the horn tip to secure the whirl in place and
faces generally concentric with the axis of the `whirl and
other
stitch-forming and setting devices, in combination
intercepted .by an angle a (FIG. 2) serve to guide the 50
with an L-shaped thread trimming knife having a sharp~
vthread into engagement with the cutting edge of the blade.
ened edge at its upper extremity located below the work
It will also be appreciated that the enlargement at the tip
supporting surface of the cap and formed with a tang
of the horn shields the sharp edge of the blade 26 so that
on its base adapted to be received in a transverse slot
there is no appreciable danger of injury to the operator
in the cap for the sole securement of the knife between
when he reaches for the thread at the start of a sewing 55
the cap and the horn.
operation. So `that the thread once guided into engage
3. A sewing machine having a rotatably mounted shoe
ment with the blade 26 will not escape over the uppermost
entering horn formed with a needle receiving opening
end of the blade without being severed, the cutting edge
at its tip, a straight hook needle alined with the needle
is inclined downwardly and slightly away from the axis of
receiving opening in the horn, a needle threading whirl
the whirl, the inclination being indicated by the angle b 60 within the opening of the horn, a perforated cap having
in FIG. 4.
In order to secure the blade 26 to the tip of the horn
the cap 22 4is formed with .a transverse slot 30 into which
is closely fitted an integral attaching tang 32 extending
a work supporting surface and an attaching tongue
secured to the horn tip to secure the whirl in place and
other stitch forming and setting devices, in combination
laterally from the body of the blade. In addition to the 65 with an L-shaped thread trimming knife located below
the Work supporting surface of the cap having a sharp
screw 24 the cap 22 is formed with a single undercut
ened edge at its upper extremity and forming a tang
abutment 34 underlying a sloping surface on the horn
on its base for securement between the cap and the horn,
tip to 羢ecure the whirl covering portion of the cap against
said cap and horn being formed with a recess into which
pivoting upwardly about the screw. To stiffen the blade
26 against lateral bending movement, an intermediate 70 the sharpened edge of the knife extends and the sewing
thread is guided so that it engages the sharpened edge
portion of the cap 22 is recessed at 36, the width of the
Of the knife as a seam inserted by the machine progresses.
recess `being equal to the thickness of the blade, the upper
4. An operator controlled sewing machine having a
surface of the blade being substantially coincident with
rotatably mounted shoe-entering horn formed with a
the outer surface of the cap. Since the cap is set in an
accurately machined slot in the tip of the horn, the ex 75 needle receiving opening at its tip, a straight hook needle
5
3,087,448
alined with the needle receiving opening in the horn, a
needle threading whirl within the opening of the horn,
6
6. A sewing machine having work feeding devices, a
rotatably mounted shoe-entering horn lformed with a
needle receiving opening at its tip, a straight hook needle
alined With the needle receiving opening in the horn,
stitch-forming and setting devices, in combination with
a needle threading whirl within 籺he opening of the horn,
a thread trimming knife having a cutting edge located
a perforated whirl retaining cap having a Work support
below the work supporting surface of the cap in close
ing surface and secured to the tip of the horn and other
proximity to the whirl, means for securing the knife to
stitch forming and setting devices, in combination with
the horn, and means on the horn for guiding a portion
a thread trimming knife having a straight cutting edge
of the thread hidden from the View of the operator into 10 below the Work supporting surface of the cap sloping
engagement with the cutting edge of the knife after the
downwardly and away from the axis of the whirl, means
beginning of the seam.
on the horn for directing the thread without interruption
5. A sewing machine for inserting stitches in a work
in work feed at the beginning of the seam into engage
piece having a rotatably mounted shoe-entering horn
ment with the cutting edge of the knife, and means for
formed with a needle receiving opening at its tip, a
securing the knife to the horn.
Y
straight hook needle alined with the needle receiving
opening in the horn, a needle threading Whirl Within the
References Cited in the file of this patent
opening of the horn, a perforated whirl retaining cap
UNITED STATES PATENTS
having a work supporting surface and secured to the
tip of the horn and other stitch forming and setting 20
463,948
Day _______________ __ Nov. 24, 1891
devices, in combination with a thread trimming knife
1,626,329
Cortese _____________ __ Apr. 26, 1927
engageable by the thread to be severed beneath the work
1,883,746
H?Doubler __________ __ Oct. 18, 1932
a perforated whirl retaining cap having a work support
ing surface and secured to the tip of the horn and other
piece, said knife having a straight cutting edge extending
downwardly from the work supporting surface of the cap
and away from the axis of .the whirl, and means for secur 25
ing the knife to the horn.
1,931,917
2,476,161
2,558,353
2,651,272
Ashworth ____________ __ Oct. 24, 1933
Silverman ___________ __ July 12, 1949
Garcia ______________ __ June 26, 1951
Carter ______________ __ Sept. 8, 1953
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