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Патент USA US3054370

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Sept. 18, 1962
J. R. lOANNlLLl
3,954,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 25, 1958
l8 Sheets-Sheet 1
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Sept. 18, 1962
J. R. [OANNILLI
3,054,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 23, 1958
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18 Sheets-Sheet 2
Sept. 18, 1962
J. R. IOANNILL]
3,054,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 25, 1958
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18 Sheets-Sheet 3
Sept. 18, 1962
J. R. iOANNlLLl
3,054,365
' LOCKSTITCI-I SHOE SOLE SEWING MACHINES
Filed July 25, 1958
18 Sheets-Sheet 4
sept- 18, 1962
J. R. IOANIIWLLI
3,054,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 23, 1958
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18 Sheets-Sheet 5
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Sept. 18, 1962
J. R. IOANNILLI
3,054,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 23, 1958
l8 Sheets-Sheet 6
Sept. 18, 1962
J. R. IOANNILLI
3,054,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 25, 1958
l8 Sheets-Sheet 8
Sept. 18, 1962'
J. RLIOANNILLI
3,054,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 25, 1958
18 Sheets-Sheet 9
Sept. 18,, 1962
J. R. lOANNlLLl
3,054,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 23, 1958
18 Sheets-Sheet l0
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J. R. lOANNlLLl
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LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 25, 1958
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Sept. 18, 1962
J. R. lOANNlLLl
3,054,365
LOCKSTITCH SHOE sous SEWING MACHINES
Filed July 23, 1958
18 Sheets-Sheet l2
Sept. 18, 1962
3,054,365
J. R. IOANNILLI
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 25, 1958
5150 '
18 Sheets-Sheet 13
Sept. 18, 1962
J. R. IOANNILLI
3,054,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 25, 1958
l8 Sheets-Sheet 14
Sept. 18, 1962
J. R. IOANNILLI
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 25, 1958
3,654,365
Sept. 18, 1962
3,054,365
J. R. IOANNILLI
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 23, 1958
18 Sheets-Sheet 16
Sept’ 18, 1962 >
J. R. lOANNlLLl
3,054,365
LOCKSTITCH SHOE SOLE SEWING MACHINES
Filed July 23, 1958
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18 Sheets-Sheet 17
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Sept. 18, 1962
J. R. IOANNILL!
3,054,365
LOCKSTITCH SHOE sou; SEWING MACHINES
Filed July 23, 1958
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l8 sheets-sheet 18
United States Patent 0
1
C6
I
r
3,054,365
Patented Sept. 18, 1962
2
When utilizing a hand-held knife it is usual in cutting
3,054,365
Joseph R. loanm‘ili, Beverly, Mass, assignor to United
LOCKSTITCH SHOE SOLE SEWING MACS
a thread to direct the edge of the knife against a surface
of the shoe as a cutting block, so that complete severance
Shoe Machinery Corporation, Boston, Mass, a corpo
ration of New Jersey
is insured and displacement of the last formed stitch in
a seam as the result of tension exerted by the knife is
Filed July 23, 1958, Ser. No. 750,392
35 Claims. (Cl. 112-32)
avoided.
Cutting the thread against the shoe always
causes damage to the shoe, so that care must be taken
in selecting a surface which will thereafter be covered up
by other parts, such ‘as that portion of a bottom surface
The present invention relates to lock stitch shoe sole
sewing machines and, more particularly, to improvements
obscured by a later applied heel.
It is an important object of the present invention to
simplify the operation of a shoe sole stitching machine
by the provision of automatic means for severing the sew
ing thread with greater reliability than heretofore, so close
in the type of sewing machine which is provided with
locking loop forming and inserting devices as distinguished
from the type having a locking thread carrying shuttle,
about which each loop of machine or needle thread is
passed in forming a conventional lock stitch seam. In 15 to the surface operated upon that in starting a new seam
certain of its features, however, the invention is not lim
the end of the thread remaining in the machine will be
ited to shoe sewing machines of the loop lock form but
drawn close to or fully into the work to a position where
is capable of use to advantage with machines for insert—
it is inconspicuous, not requiring trimming or further
ing stitches of other forms. In other respects the inven
attention on the part of the machine operator. In this
tion is intended to facilitate and simplify the operation 20 connection it is also an object to provide thread severing
of machines similar to that disclosed in an application
devices of such nature that there is no danger of exerting
for United States Letters Patent Serial No. 543,321, ?led
October 28, 1955 in my name (now Patent No. 2,877,725,
an excessive stitch displacing tension on the thread run
granted March 17, 1959).
ning to the scam, the last formed stitch always being left
ning from the machine to the shoe. The usual practice
improved form of said thread severing member particu
in the same position at which it was ?nally set in the
In sewing a shoe outsole by machine a problem always 25 substance of the shoe. Further objects of the invention
has existed at the end of a sewing operation to provide
are to provide a work support having an electrically
a simple trouble-free method of severing the thread run
heated thread severing member mounted thereon and an
is to provide means for releasing the tension on the thread
larly adapted for use in a wax thread curved needle sew
in the machine so that the shoe together with a substan 30 ing machine, wherein space limitations are highly re
tial length of thread may be Withdrawn until the shoe
stricted and the problem of heat insulation is particularly
may be turned to a position where the thread may be
troublesome.
trimmed so close to the surface of the shoe sole that its
Other objects of the invention, more particularly relat
end is inconspicuous. In spite of many attempts to pro
ing
to a sewing machine having loop lock forming and
vide automatic devices for severing thread with this type 35 inserting devices, include improving the arrangement and
of machine, none has proved satisfactory heretofore for
mode of operation for a needle loop retractor and a lock
a number of reasons, among which are:
ing
threaded loop carrying and inserting ?nger mechanism,
(‘1) The difficulties of maintaining a keen cutting edge
so arranged that a more reliable construction than here
on a thread severing knife;
tofore is obtained with ‘greater durability and ease of op
(2) Preventing displacement of the ?nal stitch in a seam
eration than in the machine of the prior application. It
by reason of tension exerted on the thread while being
is also :a purpose of the invention to improve the opera
severed by a dull knife;
tion of the prior machine by the addition of thread pull
(3) Providing the proper length of thread for start
off devices acting in stopping and starting the machine to
ing a new seam;
insure accurate and reliable positioning of the end of the
45
(4) Complete severance of the thread to avoid un
thread remaining in the machine for successfully forming
sightly fringed ends;
(5) Withdrawing a length of thread from the machine
before severing so that another trimming operation is
required to remove an excessive length extending from
the ?rst stitch in a new seam; and
a new stitch in a seam.
It has been found that threads ordinarily employed in
sewing machines and particularly those of the shoe sole
50 sewing type are subject to relatively heavy stresses ap
proaching and frequently surpassing their yield points
(6) Waste of thread in trimming.
A preferred practice, therefore, still comprises sever
during normal sewing operations. In a shoe sole sewing
machine these yield points may reach an intensity of
ing thread from a shoe at the end of a seam by employ
100 pounds under operating conditions of normal tem
ing a hand-held knife and withdrawing only that amount 55 perature and humidity. To reduce the possibility of yield
of thread with the shoe at the end of a seam needed for
ing beyond their elastic limits and otherwise to improve
severing closely to the shoe where the thread end will
the seams inserted, it is common to treat sewing threads
be inconspicuous.
The thread required in sewing shoes either vwith welts,
before use with solutions of waxes, resins, and other ?ber
modifying materials. Frequently, the characteristics of
insoles and uppers for an inseam or with welts and out
60 thread are further improved by a moderate application of
soles for an outseam is of such large size that the re
heat controlled carefully to avoid any approach to that
sistance offered to the passage of a knife edge contributes
temperature which will reduce the yield point appreciably.
to the problem of severing the thread, which is generally
impregnated with wax or other compound to lubricate
its passage through the shoe parts, to seal the interstices
between thread ?bers against entry of contaminating ma
terials and to seal the perforations formed by the stitches
One purpose for the thread treatment is to retain uni
formly in the thread a maximum amount of tensile
65
strength consistent with toughness and elastic capabilities.
The use of ?ber modifying materials and moderate heat,
however, increases the difficulties met in the use of a
after insertion. For these reasons the dif?culties are far
knife edge for severing the thread in a sewing machine.
greater than are met with light weight sewing machines
Instead of depending upon the use of a knife edge to
employing a dry thread of a size which may readily be 70 sever the thread in a sewing machine, of the type re
broken merely by tension exerted on the ?nal stitch of
ferred to, the present invention proposes the use of thread
a seam.
severing means arranged to be engaged with the thread
3,054,365
4
accomplished by connecting it to the driving and stop
at the end of a seam and heated to a relatively hightem
ping mechanism.
perature above that which begins to reduce the tensile
A
capable of~unlimited yielding action under a relatively
light pull exerted against the last formed stitch in the
Other features of the invention consist in the devices,
combinations and arrangements of parts as hereinafter
described and claimed, the advantages of which will read
comprises an electrical resistance member, the tempera
reduced scale of a portion of the driving and stopping
ture of which is controlled by a heating circuit contain- '
mechanism in the machine;
strength of the thread to such an extent that it is rendered
ily be understood from the accompanying drawings, in
seam without displacing that ‘stitch. ‘For so doing the
which:
heat of the severing means acts to evaporate the ?ber
FIG. 1 is a view in front elevationof the left hand
modifying solutions on the thread and is constructed to
portion of a shoe outsole stitching machine, including
be mounted directly on one member of a clamp for the
Work piece, so close to the work-engaging surface thereof 10 features of the present invention, parts of the machine
having ‘been broken away and reduced in height to en
that the thread may be severed with an inconspicuous end
able the use of a larger scale in the remaining parts of
remaining on the work piece without heating the Work
’
the illustration.
piece to ‘a temperature which will be injurious to the‘
FIG. 2 is an enlarged view of a portion of the ma
latter. Preferably, a nipper jaw also is mounted on the
work clamp in a manner to de?ect the thread into engage 15 chine shown in FIG. 1;
' FIG. 3 is a sectional view on an enlarged scale, look
ment with the heated severing member, so as to exert
ing along the line III-—III of FIG. 2 and showing the
a severing pull on the thread, as well as to hold the
position of a shoe at the end of a seam in the machine
severed end remaining in the machine at a position con
of that ?gure;
'
ducive to the proper formation of the ?rst stitch in a
FIG. 4 is a view in rear elevation and on a slightly
new seam. In its illustrated form the severing means 20
‘
FIG. 5 is a similar view on a larger scale of a portion
ing an energizing switch and other essential components.
of the mechanism shown in FIG. 4*but with additional
The needle thread loop retractor, according to a feature
of the invention, co-operates with a loop spreader and 25 parts broken away to illustrate more clearly the under
lying parts of 'FIG. 4;
.
the needle, each loop of needle thread being withdrawn
FIG. 6 is a detail view in right side elevation of a
from the work in the form of an open triangular loop
which de?nes a plane at an angle to the line of the
treadle connected part in the driving and stopping mech
anism of FIG.'5;
seam being inserted, together with actuating mechanism
FIG. 7 is a plan view of a portion of the same mech
effective to cause the spreader to enter each loop of 30
anism showing a locking thread pull-off with the parts
illustrated in positions assumed while the machine is at
thread from that side of the point of operation opposite
to the completed stitches of a scam, the retractor ‘both
engaging and lifting the thread from the needle hook with
’
rest;
FIG. 8 is a similar view of the parts of the locking
a continuous movement.
thread pull-off in positions assumed while sewing opera
Instead of employing a locking thread carrying ?nger, 35
tions are continuing;
such as disclosed in my prior application, which ?nger
FIG. 9 .is a sectional detail view in rear elevation on
enters each spread loop of needle thread from outside
a somewhat enlarged scale taken along the line IX-—-IX
the arc of, curvature of the curved. needle, it has been
FIG. 8;
found’ that a marked improvement in operation of the 4-70 of FIG.
10 is a sectional detail view on a somewhat
present machine and an improved facility for present‘
smaller scale, looking from the right side of the machine
ing a shoe is obtained by arranging the mechanism for
and illustrating the positions ofrthe parts just before the
actuating the present improved locking thread carrying
‘ machine comes to rest .at the end of a seam;
?nger in such a way that it enters each needle loop from
FIG. ll is a similar view of some of the parts in front
within the arc of needle curvature. By actuating the lock 45 of those shown in FIG. .10, illustrating their positions
ing thread carrying ?nger from within the arc of needle
during sewing operations;
_
curvature, greater visibility is afforded about the sewing
FIG. 12 is an enlarged front view of portions of the
point for the operator and less opportunity for inter
machine surrounding the point of sewing operations, illus
ference is given between the locking thread ?nger and
trating a locking thread severing member;
the shoe being presented to the machine.
50 ’ FIG. 13 is a detail view. in’ right side elevation showing
The loop lock stitch sewing machine of the prior ap
the operations of the locking threadsevering member
plication employs means for measuring a predetermined
on a shoe illustrated in section;
FIG. 14 is a view in left side elevation of the locking
thread severing member in a modi?ed for-m having a
length ‘of thread for each stitch and at least one thread
lock co-op'erating with the measuring means is provided
against which thread lock each stitch is set in the work. 55 thread directing guard to insure proper engagement of
In order to facilitate the insertion of the ?rst stitch in
the thread therewith;
a new seam, particularly in machines employing a thread
FIG. 15 is a detail view in front elevation of the lock
cutter,,an essential degree of accuracy required in start¢ '
ing a new seam without trimming thread extending from
ing thread severing member;
the ?rst stitch is obtained in the illustrated machine by
providing a pull-off located along the length of thread
running from the thread lock to thethread supply. The
pull-off with this feature of the invention is actuated ‘at
locking thread measuring member; ,
FIG. 16 is a sectional detail view in left side elevation
so illustrating a thread measuring action performed by the
v FIG. 17 is a sectional detail view on a further enlarged
scale of a locking thread friction device as viewed in the
the end of a seam while the thread lock remains closed,
direction of the arrow XVII in FIG. 16;
so that there is no possibility for the take-up to with 65
FIG. 18 is a detail plan view of a needle thread sever
draw; the thread‘ end from its proper position in forming
ing member mounted on the work support ofthe ma
and setting the'?rst stitch of a new seam. Thus, the
chine, together with a thread end clamping device;
'thread'lock serves two purposes; one to assist the meas
FIG. 19 is a sectional detail view in front elevation of
uring means in withdrawing thread in the proper ‘prede
the parts in the machine surrounding the sewing point
termined length“ from the supply for completion of each 70 and including the thread end clamping device;
stitch in a seam and the other to prevent displacement
FIG. 20 is asectional detail'view in front‘elevation
of the ‘thread end during operation of the pull-o? at the
and on a slightly enlarged scale, looking along the line
end of the seam. ’ Where, as in the present instance, a
' XX—-XX' of FIG. 18, and showing the construction of
driving and stopping‘ mechanism controls the operation
a work support having the needle thread severing device
vofthe machine, the proper operation of the pull-off is 75
mounted thereon;
,
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