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Sept. 10, 1946:
J. NACHMAN
2,407,342
SEWING‘ MACHINE
Filled Feb.- 25, 1944
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2,407,342
Patented Sept. 10, 1946
UNITED STATES PATENT OFFICE
2,407,342.
SEWING MACHINE
Joseph Nachman, Philadelphia, Pa.
Application February 25, 1944, Serial No. 523,871
4 Claims.
1
(Cl. 112-219)
2
ent device that has been available heretofore
which is directed to the‘ scrutinizing or inspect
stitching machines. More particularly, it per
ing of open-work type of stitching, as to its de
tains to apparatus coordinated for functioning
tailed‘ perfection and adapted to control the
in connection with‘ sewing or stitching machines
to examine or inspect the results of a stitching Cl functioning of the machine.
It is an object of the present invention to ob
operation. While the invention is of substantial
viate such difficulties and uncertainties as here
application, a primary embodiment thereof per
inabove referred to, and particularly such as usu
tains to apparatus for the production of open
ally manifest themselves in the operation of a
stitch work. exempli?ed by faggoting, which is
sewing machine while producing open-work
adapted to ascertain any defects of stitching as
stitching or faggoting.
they occur and to automatically control the op
Another object of the invention is to provide
eration of the machine under such circum
a simple, rugged means adapted to inspect the
stances, as by terminating the stitching opera
stitching operation of a machine and to auto
tion.
matically‘ terminate said operation in the event
It is well recognized that the operation of a
of any imperfections manifested.
sewing or stitching machine is not foolproof, and
Still another object is to attain an effective de
that difficulties may be frequently encountered
vice for scanning open-work stitching immedi
which manifest themselves in the form of de
ately upon its production by an appropriate ma
fective machine operation and by imperfection
chine, and automatically adapted to stop the
of the articles produced. In the case of open
functioning of said machine where improperly
work stitching or faggoting, this may be due to
stitched work is produced.
faulty functioning of the needle, thread break~
An additional object of the invention is to
age, failure of thread supply, improper thread
present an expedient attachment for a stitching
or fabric feeding, et cetera.
machine adapted to inspect or examine the per
It is known to provide a sewing machine with
fection of a faggoting operation, and to auto
an attachment which may function to cut-off or
matically cut off the machine in the event that
stop the same where a metallic object, such as a
any imperfections develop.
metal fastener element, has not been properly
It is a further object of the invention to de
sewn to an electrically non-conducting support,
vise an apparatus adapted for examining the
such as a fabric. Thus, the metallic fastener
results of an open-work stitching or faggoting
element may be embraced in an electric circuit
operation immediately as it issues from the zone
which may become effective for terminating the
of stitching, while simultaneously guiding the ar
operation of the machine only in the situation
ticle produced by the said faggoting operation.
where the surface of the metallic fastener-ele
Other objects, advantages, and features of the
ment has not been properly insulated by thread
invention will become apparent from the fol
sewn thereover in the course of attaching the
lowing description to be read in connection with
same to a fabric or the like. Similarly devices
the accompanying drawing in which similar ele
have been contemplated for cutting-off a sew
ments are designated by like numerals.
ing machine from its normal course of operation
Figure 1 is a fragmentary side elevation of the
where the thread supply to the needle has be 40
stitching machine showing partly in section the
come defective due to breakage or for any other
inspecting or examining attachment in contact
reason. However such devices are not adapted
with the work of a faggoting operation.
to function in the capacity of examining or in
Figure 2 is a cross-section taken on line 2—2
specting the stitching characteristics as applied
of Figure 1.
to the work produced.
Figure 3 comprises a partial front elevation of
In general, the prior art devices designed for
the device viewed in the direction of issue of the
controlling the operation of the sewing machine
have not been adapted to inspect open-work
?nished article.
stitching, such as faggoting, during the course
Figure 4 is a fragmentary detail, partly in sec
of producing the same, and capable of directly
tion, indicating the inspecting ?nger riding on the
and automatically terminating the machine op
faggoting stitches which serve to insulate said
eration in the event of work discrepancies or im
?nger from contact with an electrical conduct
perfections, without resort to any supplementary,
ing plate for supporting the stitch work below the
super?cially attached electrical conducting
zone wherein said inspecting ?nger operates.
means. In fact, there appears to be no expedi
Figure 5 is a view similar to that shown in
This invention relates to the art of sewing or
2,407,342
4
‘
3
Figure 4, but with the inspecting ?nger in con
tact with said electrical conducting supporting
plate through broken stitches of the open-work
stitching, such as faggoting, thereby illustrat
ing as a mechanical inspecting or examining de
vice. As long as there is no break or imperfec
ing the position of the ?nger in the event of
an imperfection in the article produced.
Figure 6 is a diagrammatic showing of an
[4 by the intervening stitches, as indicated in
Figures 1 and 4.
In the event that a break or imperfection is
tion in the stitching uniformity, inspecting ?nger
ill will be prevented from contacting base plate
electric circuit for Operating the stitching ma
manifested by the open-work stitching, result
chine, as well as automatically terminating its
ing in a space or gap between stitches large
action in the event of contact between the in 10 enough to permit the inspecting or examining
specting ?nger and the electrically conductive
?nger IE! to pass through and contact conduct
supporting plate.
ing plate 14, the circuit of solenoid l8 shown
Referring more particularly to the preferred
in Figure 6 will be closed, provided manually
embodiment of the invention as presented by the
operated switch ‘.22 has been previously closed.
various ?gures of the drawing, numeral 1 broadly 15 As the solenoid it becomes energized upon the
indicates a sewing or sitching machine head to
closing of the circuit within which it is em
which a needle bar 2 is attached. Needle 3 is
braced, it will attract magnetic switch 19, re
is a?ixed to said needle bar 2 by means of a
sulting in opening the circuit in which the sew
screw element 4 in accordance with conventional
ing machine motor is located. Accordingly, any
practice, and is coordinated with foot 5 for per 20 undue gap in the stitching or faggoting opera
forming- the stitching operation. Mounted on
tion will cause an automatic break in the circuit
foot 5 is a bracket ‘5, by a screw means 1, and
determining the operation of the sewing machine,
integral with the said bracket is a bifurcated
thereby aliording opportunity for correction of
arm 53. A point of rotation or pivot 9 may pro
the dilhculty involved and permitting resumption.
ject through appropriate openings in the afore 25 of the operation under desired conditions.
said bifurcated arm of the bracket, and mounted
As above indicated. by devising the examining
for rotation thereon is the inspection or examin
?nger it of a dimension to embrace the stitching
ing ?nger IE1 adapted for contact with the article
between edges E3 of the tape, the said ?nger will
253 issuing from the Zone of the needle operation.
function as a guide means as well as an exam
Desirably, the contact of ?nger It with open 30 ining device adapted to control the operation of
work stitching of 23 is facilitated by the action of
the stitching machine motor. This is of material
a spring means I2, which may be seated on pivot
signi?cance in that it enables simpli?cation of the
9 as shown in Figures 1-3. A dotted showing II
attachment by making possible the omission of
is presented of the spring depressed ?nger Ill
collateral guide means, and in addition permits of
raised out of contact with article 23 against the
a distinctly more efficient operation than hereto
tension of spring means l2, where circumstances
fore.
dictate.
The work tape forming the edges [3 of the
As shown in the ?gures of the drawing, the
dimension of the contact surface of the examin
faggoting is supported on a frame or table I‘!
ing ?nger may desirably embrace two consecu
tive stitches 221i. Expediently, the dimension may
which is of non-conducting material in accord
ance with the usual design of stitching machines.
Beneath the zone of contact of examining ?nger
be such as to include two stitches along a median
line drawn longitudinally of the article, i. e., par
allel to the tape edges. However, it is not intend
ed to be restricted to any particular dimension or
ID, the article 23, subject to mechanical inspec
tion, is supported by an electrical conducting
plate l4, desirably metal. Elements l5, l6 desig
' design of inspecting ?nger, either taken as a
nate electric wires comprising elements of the
circuit shown in Figure 6. An electro-magnet
or solenoid I8 is adapted to control magnetic
switch l9 under predetermined conditions. The
whole or with respect to its contact surface.
are such as to prevent the ?nger means passing
motor for operating the sewing machine is desig- _
nated as 2!}, while the source of direct current
for the operation of the solenoid is indicated as
2|. A manually operated switch 22 is also em
braced in the showing of Figure 6.
In the operation of the apparatus, the parallel
tape edges l3 are directed beneath the zone of
operation of switching needle 3 where the open
work stitching or faggoting is supplied to con
nect the edges. From there, the ?nished article
23 is passed beneath the area of contact of the
examining ?nger l0. Desirably as the completed
article, such as faggoted tape 23, proceeds from
contact with IE, it may be fed to a reel or similar
means not shown which is adapted to maintain
the tape under a reasonable degree of tension
and in uniformly extended condition as the open
work stitching operation proceeds.
Where the onen~work stitching or faggoting is
devoid of imperfections, examining ?nger Ill will
ride thereover, desirably ?tting into the shallow
groove or depression determined by the edges I3,
will appear from Figure 3. It will thereby
function as a guide means for the tape as it
progresses through the stitching operation to be
wound upon a distributing reel, while also serv
It
is merely requisite that the design and dimension
through the interstices determined by the respec
tive threads or stitches into contact with base
plate It or its equivalent, except where a prede
termined degree of imperfection or lack of uni
formity, et cetera, is encountered. Thus exam
ining ?nger It may be designed to embrace three
or four stitches, and in some instances, merely one
may su?ice.
Similarly, its characteristics may be
such as to detect a breakage or imperfection only
where two consecutive stitches or an equivalent
thread supply are involved.
In brief, it is merely
60 essential that the ?nger be adapted to maintain
contact with the stitches where no imperfection
or lack of uniformity of a predetermined nature
is apparent, and to make contact with conduct
li’lg plate ll; immediately upon the passage there_
beneath of a predetermined extent of imperfec~
tion or lack of uniformity.
While the invention has been described in con_
nection with open-stitch work as illustrated by
faggoting, in which ?eld of application it is par
ticularly effective, it is not intended to be re
stricted to this adaptation. Thus, it may be
applicable in the art of weaving or to other ?elds
where the characteristics of the material contem
plate distinct interstices or gaps between the
75 thread or ?bre determining its texture.
2,407,342
5
It will be apparent that a simple, effective ap
paratus is provided for expediently scrutinizing
positioned for making an electrical contact with
the plate, the construction and operation being
the characteristics of the work produced by a
stitching machine, particularly in connection with
such that upon passage of properly stitched ma
terial, the ?nger is insulated from the plate, but
upon passage of material in which stitching is
defective, the ?nger shall move into engagement
ables a control of machine operation, dependent
with the plate thereby to close the circuit.
upon the perfection or uniformity of the article
3. In a stitching machine, the combination of
produced, not heretofore known in the open stitch
a table, a presser foot and a needle operatively
work art.
While I have described my invention in accord 10 associated therewith, a source of power for the
machine and means for cutting o? said source
ance with desirable embodiments, it is obvious
of power to stop the machine including a circuit
that many changes and modi?cations may be
having therein a solenoid, a, contact plate and
made in the details of construction and in the
the art of open~wori< stitching or the like. »
t en~
a work engaging ?nger, said plate being posi
combination and arrangement of parts, without
departing from the spirit of the invention as de 15 tioned for supporting the stitched material as it
issues from the needle and presser foot, the ?nger
?ned in the following claims.
being operatively supported above the material
Having thus described the invention, what is
and positioned for making an electrical contact
claimed as new and desired to be secured by
with the plate, the construction and operation
Letters Patent is:
1. In a stitching machine, the combination of 20 being such that upon passage of properly stitched
material, the finger is insulated from the plate,
a table, a presser foot and a needle operatively
but upon passage of material in which stitching
associated therewith, a source of power for the
machine and means for cutting o? said source
is defective, the ?nger shall move into engage
of power to stop the machine including a circuit
ment with the plate thereby to close the circuit,
having therein a solenoid, a contact plate and a 25 said ?nger also being so formed at its fabric
engaging end as to guide the stitched portion of
work engaging ?nger, said plate being positioned
the material.
for contact with the stitched material at one side
‘A. In a stitching machine, the combination of
thereof as it issues from the needle and presser
foot, the ?nger being operatively supported at
a table, a presser foot, and a needle operatively
the other side of the material and so disposed as 30 associated therewith, a source of power for the
machine and means for cutting off said source
to make contact with and complete the circuit
through the plate, the construction and opera
of power to stop the machine including a circuit
tion further being such that the said ?nger con
having therein electrically responsive means, a
tacts said plate only upon passage of an imper
contact plate and a work engaging ?nger, said
plate being positioned for contact with the
iection in the stitched material.
2. In a stitching machine, the combination of
stitched material at one side thereof as it issues
a table, a presser foot and a needle operatively
from the needle and presser foot, the ?nger being
associated therewith, a source of power for the
operatively supported at the other side of the
machine and means for cutting off said source
material and so disposed as to make contact
of power to stop the machine including a circuit 40 with and complete the circuit through the plate,
having therein a solenoid, a contact plate and a
the construction and operation further being
work engaging ?nger, said plate being positioned
such that the said ?nger contacts said plate only
for supporting the stitched material as it issues
from the needle and presser foot, the ?nger being
upon passage of an imperfection in the stitched
operatively supported above the material and
material.
JOSEPH NACHMAN.
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