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Патент USA US3029769

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April 17, 1962
Filed Dec. 23, 1959
2 Sheets-Sheet 1
V/croQ d. 5/5004
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‘April 17, 1962
Filed Dec. 23, 1959
2 Sheets-Sheet 2
Her-04> J. $16004
States ‘Patent’
. .
P'a'tentedApr. 17, was
, 3,029,759..
. J.i Sigoda,
‘61 Old PondDEVICE,
Road, GreatNec-k,
Fae-a Dee. 23, 1959, seeNQ. 861,536‘
2 Claims.
(Cl. 112-9127) '
bracket for the movable cutter member, the operating
connection between the- support bracket and the feed
dog, and the operating‘- relationship of the‘ cutter mem
bers, the stationary shear member having been partly
broken away;
FIG. 4 is an end sectional w'ew taken’ from the op
erator’s left showing the driving connection for the feed
bar, and also showing the operating relationship of the
use‘ with zigzag sewing machines. More particularly, it
cutter members;
concerns an attachment adapted to trim away the ex
cess material from the bottom layer‘ of fabric as an up 10
FIG. 5 is a ‘detail view‘, partly in section, taken on
per decorative" layer such as lace istopStitched thereto.
line 5~—5 of FIG. 4, showing the drive connection be
Such work is known as “applique” in‘ the‘ trade and is
tween the feed-dog and the movable cutter bracket; and
used typically in the bodice and skirt portions of such
FIG. 6 is an eiplode‘d View, in perspective, showing
This‘ invention relates to a» trimming attachment for
feminine undergarments a'sslips‘ and nightgowns.
In a general way, this‘ attachment performs similarly 1.5
to that disclosed in the Sigo'da’ U.S. Patent No. 2,432,545
of December 16, 1947. That device" also trims the ex
cess'material from the edge of a bottom ‘layer, leaving a
small‘ margin extending beyond the stitching. However,
the means for'rn'oiiiiting~ the movable cutter on its sup
port bracket.
Only so‘ much,‘ of the z‘igzag‘machine as is necessary
to’ an understanding of the‘ invention is indicated in the
drawings; Referring now’ thereto, the cloth-plate 19' of
the sewing machine is provided with a cut-out 11 for the
usual throat-plate which is,v replaced when’ the attach
because the movable cutter is operated upwardly, and 20
mantis installed." The standard feedib'ar' 12 is provided
because of the bulk of the‘ separator platform, that trim~
ming attachment is limited in that it'cannot be used in
with a modi?ed form of feed-dog 14 which carries a stud
drive shaft 15 (see FIG. 3) at its forward end and which
the production of sharp, reverse points on such gar
ments without making a cut in the fabric beyond the
extends ‘laterally’ across the line of stitching. The feed
point. Since inv the formation of such points, the line of 25 dog is provided with‘ the usual serrated teeth in a series
of rows, the rightmost of which, as seen in FIG‘. 3, is
stitching movesv off in a reverse direction after the ex
useful in conjunction‘ with the presser-foot in drawing
c‘c'ss is trimmed away, the out beyond the point is not
away the trimmed‘ off eii'cess from the bottom layer of
subsequently covered‘ by the stitching, and this leaves’an
fabric to remove it from the sewing area to avoid subse
unsightly cut in the garment.
In" the‘ instant‘ device,‘ this limitation has been over 30 quent fouling‘.
A support plate 16 which carries’ the cutter elements
come‘ by utilizing a movable cutter which operates down
wardly against agnovel stationary shear member which
is installed in'the cut-out 11 after the‘origin'al throat-plate
is removed. _ Plate 16 is provided with a pair‘ of mount
is part of a substitute needle-plate. The close adjacency
ing holes ‘17 positioned to register with thethr‘eaded holes
of the shear edge to the needle hole and the rearrange
ment of- the cutting action to a point just behind the 35 in the machine bed,‘a'nd two’sets of opposed, downward
ly projecting ears 18, each set of which is designed to
needle makes possible the successful production-of sharp
act as one bearing support for a movable cutter support
points in such garments;
bracket 19. Each ear‘ of each set has‘ a clearance ‘hole
The instant attachment structurally resembles that dis
in register to permit a screw such as that designated 20a
closed in Sigoda U.S. Patent No. 2,472,862 of June 14,
1949. It differs however‘ in‘v two vsigni?cant respects. 40 in FIG. 3 to be mounted horizontally to provide a pivotal
mounting for support bracket 19. Screws 20a are re
The earlier attachment was designed to provide a shear
tained in place by round, slotted nuts 2%. ‘
action inside the line of‘ stitching so that‘ no margin of
Plate 16' is also provided with an aperture 21 through
goods‘would‘ be left outside the stitching after completion
which the feed-dog and the movable cutter operate, and
of the sewing. The instant attachment is arranged to
leave a small margin of ‘goods extending’ beyond the 45 a second set of holes through which screws may be
passed to secure a combined stationary cutter‘ andne‘edle
stitching on completion of'the' sewing: Furthermore, in
plate member 22 on the upper surface of plate 16 (see
the attachment of that patent, the cutters were arranged
so that the‘ desired shear action ‘is effective immediate
FIG. 2).
ly in front of the path of vertical reciprocation of the
needle in the directionof the line of feed; In the pres
Member 22 is L-sha‘p‘e in form and is pierced in one
leg thereof with an elongated needle opening 24, immedi—
ent device, the arrangement is such that the shear action -
ately adjacent to one end of which, the edge 25 has been
occurs rearwardly beyond the path of needle reciproca
prepared" as a vertical shear ‘face to mate with the mov
Accordingly, it has been an object to provide a trim
able cuttei'. Preferably this face is provided with a slight
back-01f relief on the underside to assist in the shear ac
tion; Optionally, this edge‘ may be faced with a hard,
long wearing material such as tungsten carbide, to main
tain' the shear edge in‘ cutting condition for‘ a’ long time
ming attachment for‘ use with zigzag sewing machines
which is capable of producing sharp‘ reverse points with
out leaving‘ any cut portion‘ uncovered by the stitching.
With the above and such other objects as may appear
before regrinding.
As best seen in FIG. 6, the movable cutter support
in the following description, the invention as applied
herein can be best understood by referring thereto in 60 bracket 19 is formed like a square letter C, with bearing
hubs 26 formed on the extremities of the parallel arms
conjunction with the drawings, in which:
thereof, and with a block 28 formed integrally with the
FIG. 1 is a view in perspective taken from the opera
bridge connecting the parallel arms. Bearing hubs 26
tor’s left showing the complete attachment as installed
are provided for the pivotal mounting on screws 20a
on the sewing machine, the presser foot having been in
between the two sets of opposed ears 18 on plate 16 men
dicated in broken line;
65 tioned previously. Block 28 is part of the means for
FIG. '2 is a detail view in perspective, the cover plate
obtaining the vertical oscillation of bracket 19 which
of the attachment having been removed, showing how
produces the cutting action and is also part of the means
the attachment ?ts into the throat-plate cutout of the
for retaining the movable cutter.
sewing machine, and showing in particular the novel
Block 28 is formed with a recess 29 in which the feed
combined stationary shear member and needle-plate;
dog stud shaft 15 ?ts when bracket 19 is mounted in
FIG. 3 is a detail view in perspective showing the
the machine cut-out 11, and a vertical slot 30 in which
feed-bar and the feed-dog mounted thereon; the support
cutter blade 31 is held by means of clamp block 32 and
the screw 34 which passes through block 32 and into a
horizontally disposed tapped bore in block 28. The tang
of blade 31 is preferably serrated to provide better grip
ping action in slot 30 when screw 34 is tightened.
of the work or choking of the cutters which might oc
cur if the cutting action were effective while the work
was in motion.
Movable cutter blade 31 is hook shape in form, and
In order to trim the bottom layer only, some means
for separating the plies must be employed. In the men
tioned patent, this function is performed by the platform
as may be noted in FIG. 6, the upper portion of this
hook slopes to the rear. The face of this hook oppo
portion of the stationary cutter designated 21a therein.
The same function is incorporated into the presser-foot
site the serrations is prepared as a shear face having a
shoe in this instance, but since this is a matter well known
shear edge 35 disposed along the slope mentioned. Shear 10 in the art and which can be accomplished in a variety
edge 35 ‘cooperates with the shear edge 25 on the sta
tionary cutter member 22. The tang of blade 31 may
be adjusted vertically in slot 30 so that the cutting action
which takes place as shear edge 35 moves downwardly
of ways, and since it is not part of the invention, it is
not detailed either in the drawings or in this description.
sired. By keeping the point of engagement just rearward
ments imparted by the feed-dog when said support plate
What is claimed» is:
- '_
1. In combination with a sewing machine having a
against shear edge 25, is positioned along the line of 15 needle reciprocating in a vertical path, a throat-plate cut~
stitching at a point just slightly rearwardly of the needle
out and a modi?ed feed dog having a portion adapted
penetrations as the seam is formed. Because of the rear
to impart the vertical movements of said feed-dog; a
ward slope of shear edge 35, it becomes apparent that
support plate for a pair of cutting members adapted to
the vertical adjustment of blade 31 in the clamp means
be mounted in said throat-plate cut-out in replacement
on support bracket 19 will result in shifting the point of 20 of the usual throat-plate; a movable cutter pivotally sup
engagement of the shear edges either forwardly or rear
ported on said support plate and adapted to be rocked
wardly with respect to the needle penetrations, as de
about its pivotal mounting by the said vertical move
of the needle penetrations no cutting will occur beyond
is mounted in the throat-plate cut-out; and a mating sta
the point being sewn and this production ‘defect is there 25 tionary cutter mounted on said support plate, said sta
by eliminated.
tionary cutter being provided with a transverse elongated
When the cutters are assembled on support plate 16,
needle opening and a shear edge formed adjacent one
it is desirable to provide resilient engagement between
end of said needle opening, said movable cutter and said
the shear edges. As seen in FIG. 3, leaf spring 36 is an
stationary cutter being so arranged and disposed with
chored under one of the screws 20a and turning screw 3-8 30 respect to each other and to the path of reciprocation of
into the tapped hole provided in one of the arms of
said needle that said cutters are effective to sever the
bracket 19 increased the pressure applied on the shear
work at a point beyond the said needle path rearwardly
edges by the leaf spring.
in the direction of the line of feed.
When the assembled attachment is to be installed on
2. A combined needle-plate and stationary cutter
the sewing machine, support plate 16, with the cutters 35 member for use with a trimming attachment adapted to
mounted thereon, is placed into the throat-plate cut-out
be installed on a sewing machine having a needle recip
11 with the stud shaft 15 on the feed-dog inserted into
rocating in a vertical path and which is provided with a
the recess 29 of the movable cutter support bracket 19.
cut-out for a throat-plate and which has a modi?ed feed
A cover or base plate 39 provided with a cut-out in which
dog adapted to impart the vertical movements thereof;
member 22 may lie flush with the surface thereof and 40 said attachment comprising a support plate adapted to
through which the feed-dog 14 may also operate is in~
‘?t into said throat-plate cut-out in place of the usual
stalled on the cloth-plate 10 of the machine by means
throat-plate; a movable cutter pivotally mounted on said
of the standard countersunk head screws 40 which pass
support plate adapted to be rocked about its pivotal
through holes 17 of plate 16 and into the‘existing threaded
mounting by the vertical movements imparted by the
throat-plate mounting holes in the bed of the machine. 45 said feed-dog when the support plate is mounted in the
Since the sewing machine is provided with the usual
throat-plate cut-out; said combined needle-plate and sta
four motion drive for the feed-bar 12, the feed-dog 14,
tionary cutter member being L-shape in form and having
and stud shaft 15 accordingly, has two vertical move
an elongated needle hole transversely disposed in one
ments, up and down, and these are transmitted from shaft
leg thereof and a shear edge formed adjacent one end
15 to support bracket 19 to operate the movable cutter 50 of said transverse needle hole, said stationary cutting
as the sewing takes place.
member being adapted to be mounted on said support
In the installation of the attachment, nothing is done
to interfere with the normal operation of the stitch-form
ing and feed members, and these functions are therefore
carried out in the usual manner as the cutting action 55
progresses. Since only the downward vertical move
ment of the feed-dog is e?ective in producing the cut
ting engagement of the, shear members, and since this co
plate in mating engagement with said movable cutter
and to be arranged so that the shear action of said cut
ters will be effective at a point beyond the said needle
path rearwardly in the direction of the line of feed.
References Cited in the ?le of this patent
incides with the interval during which the feed is not ef
fective to transport the work, the trimming of the sur 60
Sigoda ______________ __ June 14, 1949
work is at rest. This prevents bunch‘ing and wrinkling
Burger? ?'Z~'F"'T'T‘TTT‘?TTT? De?’ ‘15' .1959
plus fabric from the bottom layer takes place while the
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