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Патент USA US2136288

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Nov. 8, ‘ 1938.
F. EBERT
2,136,288
THROAT PLATE FOR SEWING MACHINES
Filed Jan. 25, 1955
"
5 Sheets-Sheet 1
f/orrrey.
NOV. 8, 1938.
‘
>
F_ EBERT
2,136,288
THROAT PLATE FOR SEWING MACHINES
Filed Jan. 25, 1935
'
5 Sheets-Sheet 2
Afformey,
Nov. 8, 1938. ‘
'
-.
F. EB'ERT
2,136,288
THROAT PLATE FOR SEWING MACHINES‘
>
Filed Jan. 25, 1935
'
5 Sheets-Sheet 3
HI
me“. 1mm
'
31
5%
Nov. 8, ‘1938.
F. EBERT
2,136,288
THROAT PLATE ‘FOR SEWING MACHINES
Filed Jan. 23, 1-955
5 Sheets-‘Sheet 4
AWo/wey.
Nov. s, 1938.
"
F. EBERT
‘
2,136,288
THROAT PLATE FOR SEWING MACHINES
Filed Jan. 25, 1935
4%
25 I.
5.Sheets-She‘et 5
2,136,288
Patented Nov. 8, 1938 4
UNITED STATES PATENT ()FFIQE
2,136,288
THROAT PLATE FOR SEWING MACHINES
Fritz Ebert, Oberndorf-on-the-Neckar, Germany,
assignor to Mauser-Werke A. G., Oberndorf
on-the-Neckar, Germany, a joint-stock com
pany of Germany
Application January 23, 1935, Serial No. 3,168
In Germany January 29, 1934
3 Claims.
The present invention relates to needle plates
or throat-plates for sewing machines.
The primary object of the invention is to pro
. vide a throat-plate for sewing machines which
5' will satisfactorily guide the fabric portions to be
united to the needles of the sewing machine
whereby a seam having the combined fastening
and seam covering stitchings may be effected.
; I; In accomplishing this latter, I provide a throat
10 plate with a resilient hem fold guide with a
guide. tongue or portion and the latter having
the necessary channel or opening therein to ac
commodate the usual upper movable knife of
the trimming mechanism of the sewing machine.
15
Compared with known devices of this kind,
the present device has the essential advantage
in that the guide portion with its lateral edge
serves as a stop and does not extend above the
._ upperface of the throat-plate. The guide por
(Cl. 112—-260)
provided at the left hand guide member which
also is ?xed to the throat-plate. By this lateral
projection the ridge of the seam is vertically fold
ed so that it may be covered in this position.
In the accompanying drawings, forming part 5
of the speci?cation, some constructions of throat
plates according to the invention are shown by
way of example.
In these drawings:
Fig. 1 is a front elevation of a throat-plate,
of Fig, 1,
.
Fig. 3 is a side view, looking from the left of
Fig. 1,
.
Fig. 4. shows a plan view,
15
Fig. 4a is .a section on the line IVa;—-IVa of
Fig. 4,
Fig. 5 is a section on the line V—V of Fig. 4,
if cross seams occur, the vertical space between
Fig. 6 is a plan view, corresponding to Fig. 4,
showing a modi?cation having aligned. stitch 20
holes.
the right hand side of the throat-plate and the
hem fold guide, provided at the left hand side,
Fig‘. 6,
20 tion is, moreover, resiliently arranged, so that,
. may be enlarged.
‘
The hem fold guide may be adjusted accord
ing to the desired width of trimming and the
thickness of the material to be handled. At two
points the resilient hem fold guide is reduced in
cross section or weakened, so that the long shank
30' alone as well as together-with the resilient guide
tongue may yield upon pressure being applied
thereto.
,
To prevent the formation of bunches and in
. order to tension the scam, the tongue portion
35’ for the cover seam may be arranged in an ele
vated position with regard to the remaining part
of the throat-plate.
A further feature of the invention consists in
- that the correct width for piercing may always
40' be maintained.
Fig. 6a is a section on the line VIa—VIa of
Fig. '7 is a front elevation, showing a further
. 2'5'
For this purpose an adjustable
guide member is provided at the right hand side
.of the throat-plate by means of which the fabric
is guided in such a manner that it will always be
the invention,
Fig. 7,
Fig. 9 is a side view, looking from the left of
Fig. 7,
terially facilitating the withdrawing of the fab
,
Fig. 10a is a section on the line Xa—Xa of
Fig.
10.
'
_
.
Fig. 11 is a section on the line XI—XI of Fig. 10,
Fig. 12 is a front elevation of a third modi?ca- 35
tion of the throat-plate according to the inven
tion,
'
Fig. 13 is a side view, looking from the right of
Fig. 12,
Fig. 14 is a side view, looking from the left‘ of 40
Fig. 12,
-
Fig. 15 shows a plan view, '
Fig; 16 is a section on the line XVI-XVI'of
Fig. 15,
50‘ ric from the cylinder.
In a modi?cation of the throat-plate according
to the invention in which the stitch hole for the
middle needle is arranged in front, a projection,
extending until in front of the stitch holes for
55‘ the needles producing the cover seam, is laterally
30
Fig. 10 shows a plan view,
45 be resiliently pivoted to the throat-plate. This
guide member on the throat-plate provides the
further advantage that a special stop at the
presser foot may be disposed with thereby ma
‘
Fig. 8 is a side view, looking from the right of
Fig. 15,
correctly pierced.
.
modi?cation of the throat-plate according to 25
The guide member may also
_
10
Fig. 2 shows a side view, looking from the right
Fig. 17 is a section on the line XVII-XVII of 45
Fig, 18 shows a detail plan view of the guide
member,
Fig. 19 is a section on the line XIX~XIX of,
Fig. 18,
50
Fig. 20 is a front elevation of a still further
modi?cation of the throat-plate according to the
invention,
Fig. 21 is a side view, looking from the right of‘
Fig, 20,
55‘
2
10
n
2,136,288
Fig.
Fig.
20,22 is a side view, looking from the left
may be adjusted in a recess 5 of the throat-plate
Fig. 23 is a plan view,
Fig. 23a is a sectional view taken on line
XX[IIa-~XXIIIa of Fig. 23 with the addition of
the fabric portions in their relative position.
means of a screw 6.
I, whereupon it may be ?xed to the latter by
The cross section of the
fold guide part 2 is reduced at two points ‘I and 8,
whereby not only resiliency of the long shank 2’,
but also of the guide tongue 3, provided with the
Fig. 23?) is a sectional view taken on line
slot 4 for the passage of the upper knife (not
XXIIIb—XXIIIb of Fig. 23 with the addition of
the fabric portions in their relative position.
shown) of the trimming mechanism, is obtained.
Fig. 230 is a sectional view taken on line
XXIIIc-XXIIIC of Fig. 23 with the addition of
the fabric portions in their relative position.
Fig. 23d is a sectional view taken on line
XXIIId—XXIIId of Fig. 23 with the addition of
15 the fabric portions in their relative position.
Fig. 24 is a section on the line XXIV~XXIV of
Fig. 23,
Fig. 25 is a section on the line XXV-XXV of
Fig. 23, showing the connection of the throat
20 plate to the support,
Fig. 26 is a detail side view of the guide mem
ber and
Fig. 27 shows a plan view of the guide member.
Figures l-5 and 7-11 show constructions of a
throat-plate for sewing machines on which the
fastening or joining seam and the cover seam are
produced separately, i. e., a throat-plate in which
one of the stitch holes is arranged in front of the
other stitch holes, and Fig. 6 shows a plan view,
corresponding to that of Figures 4 and 10, of a
throat-plate having all three stitch holes ar
ranged in alignment or in the same direction,
1. e., a throat-plate for sewing machines on which
the fastening or joining seam and the cover seam
35 are made simultaneously.
The construction shown in Figures 1-5, inclu
sive, is particularly adapted for thin fabrics, and
the throat-plate l in this case is provided with
a special resilient hem fold guide 2, having a
40 guide tongue 3 with a slot llthrough which may
operate the upper knife (not shown) of a trim
ming mechanism, particularly of the kind dis
closed in Patent No. 2,044,275 of June 16, 1936.
The body portion of the throat-plate con—
45 sists of a laterally extending rear end portion A
preferably of an arcuate con?guration in order
that it may be applied to the outer end of the
usual carrier arm of the sewing machine and has
the openings B formed therein for the reception
In this way, fabrics having cross seams may con
veniently be passed through the machine, with
10
out such cross seams forming an obstacle. An
opening H is formed within the arm D and a simi
lar opening I is formed between the arms C and D,
both of which accommodate the usual feed dogs
15
of the sewing machine.
An inclined guide l6, formed with the arm D
has extending therethrough the stitch hole 9 for
the needle of the trimming seam, has the effect,
that the seam ridge, on the short way to the
stitch holes I I and I2 for the needles of the cover
seam, is folded and therefore during covering lies
?at.
By this method it is, however, also possible to
produce a single seam and for this purpose, the
stitch hole for the needle connecting or joining 25
the two fabric edges is arranged as the middle
hole of three or more parallel stitch holes I4,
provided in one plane or in alignment with the
other stitch holes (see Fig, 6). The two pieces
or webs of fabric are thereby folded in exactly 30
the same manner. By means of the inclined
guide l3 also provided in this case, the two pieces
of the fabric are folded flat in front of the three
stitch holes ill, arranged in a single plane or in
alignment, and are, therefore, sewn together by 35.
the three needles, not shown in the drawings,
working in these three stitch holes.
The construction shown in Figures 7-11, in
elusive, is particularly adapted for thicker fabrics
and also has all the advantages mentioned above. 4.0
The substantial difference between this modi?ca
tion and that already described consists in this,
that the tongue portion 55 for the cover seam is
arranged in elevated position with regard to the
remaining part of the throat-plate l, whereby the 45
effect of the inclined guide 16, provided for fold
ing the seam ridge or the two parts of the fabric
respectively, is particularly enhanced. The ad
vantage obtained by this construction is, that
50 of screws or similar means for fastening the
the seam may be stretched or tensioned, whereby 50
throat-plate to the carrier arm of the sewing ma
chine. Formed with and extending from one edge
of the rear end portion A are a pair of spaced
parallel arms C and _D and the upper faces of
55 these arms lie substantially flush with that of
the rear end portion A. The outer or free end
of the arm D is provided with an openingE for
the formation of bunches is prevented.
The arrangements illustrated are suitable for
the reception of a screw or similar means re
quired for attaching the same to the carrier arm
60 of the sewing machine.
The hem fold guide 2
consists of a plate having a relatively long shank
2’ which is seated within a recess formed within
the upper face of the arm C whereby the upper
75
sewing machines provided with an overhanging
arm and adapted for feeding in the upward direc
tion of the arm. The advantages obtained with 55
such machines may, however, also be obtained
with sewing machines provided with an overhang
ing arm adapted for feeding in the downward
direction of the arm or across the arm as well as
for flat bed sewing machines.
60
According to the modi?cation shown in Figures
12-19, inclusive, a recess 56 is provided in the
upper face of the outer extremity of the arm D of
the throat-plate l in which a guide member l1
face of this guide plate will lie flush with that
of the body portion of the throat-plate. Formed _ is arranged which may be ?xed by means of a 65
with the outer end of the shank 2’ and ext-ending screw I8. The guide member I‘! is adjustably
at one side thereof is a guide tongue 3. This mounted, so that its guide edge l9 may be brought
guide tongue being so suspended within the space into its correct position according to the material
provided between the arms C and D establishes to be handled. As a result, correct piercing of
the needles through the fabric is always war 70
between its outer longitudinal edge and the slop
ing edge or face F of the arm D a channelway ranted.
The guide member H is provided with an open
through which is fed the hem portions of the
pieces of fabric to be united. According to the ing 26 which registers with the opening E of the
desired width of trimming and to the thickness arm D to accommodate an attaching screw,
of the material to be handled, the guide part 2 whereas the arm C and the hem fold guide 2 may
2,136,288
have an aligning opening J' therein through which
may extend a screw or other suitable means for
3.
ing against‘ the throat-plate serves to limit the
swinging movement of the stop» I1, thus main
attaching'the same to the carrier arm of the sew
taining at all times a certain width of passage.
Fig; 23a shows .in'cross section the fabrics to
According to the modi?cation shown in Figures be sewn together and the coacting parts in their in
20-27, inclusive, the guidemember I1 is resiliently relativepositions before the knives a and b have
and pivotally connected to the throat-plate I. cut the edges of the fabric portion 0 and d.
A. screw 2 I. serves; as pivot for. the guide member Figure 23b is ‘a cross sectional. view of the step
I1 and simultaneously for attaching‘ the outer following that shown in 23a. and discloses the
end of' the arm D of the throat-plate I and the 1 joining needle e operating in stitch 'hole~9, in 10
lower knife 22, as shown in dotted lines in Figure frontv of ‘the two covering needles f which pass
23,. ofthe trimming mechanism to the support through the stitch holes 32.‘ In this secondfstep,
23 of the carrier arm- of the sewing‘ machine. To the edges of the fabric portions 0 and'd‘are
relieve the screw 21' from the action of the guide already cut and bent against one anotherto
member I1, tending to lift-the same, the arm D obtain‘ the position required for joining the two
of the throat-plate I and the guide member I‘! are fabric portions. Fig. .230 discloses the third step
dove-tailed at 24. At this side of the guide wherein the joining seam g has been produced
member IT, a slot 25 is provided in which en
and the edges of the fabric portions 1: and d
gages a spring 26, held by the head of a screw lie ?at in the position required for covering. It
21. A set screw 28, provided in the guide member can be seen from the foregoing steps that the 20
I‘I, bears against the throat-plate I and serves _ lefthand piece 0 of the fabric is, when fed into
to limit the movement of the guide member I ‘I the machine, bent at an acute angle which pro
in one direction against the action of the spring gressively decreases until the cover needles. ,f are
26 and to allow an exact adjustment of the desired reached. The righthand piece d of the fabric is
width of piercing. Fig, 23d shows in cross sec
fed into the machine at an obtuse angle which 25
tion the operation of the adjusting screw 28 progressively increases until the said covering
whereby member I‘! can 'be adjusted relative to needles 1‘ are reached. The joining needle e, unit
its supporting arm. As shown, adjusting screw 28 ing the two pieces 0 and d of the fabric and
is mounted through a portion of the guide mem
thereby forming the joining seam g; operates in
ber I1 and by rotating said adjusting screw 28, front of the two covering needles I.
it may be caused to bear against the arm of the
As shown in Fig. 23, in operation a knife 22
throat-plate I. By this means, the pivotal move
is adjustably mounted upon the arm of the
ment of guide member I‘! can be adjusted in order throat-plate I which supports guide member II.
that resilient spring 26 cannot move the end por
This knife 22 is provided with an elongated slot
tion of the guide member I‘! in a horizontal posi
35 whereby the usual screw passing through the 35
tion a distance greater than the said adjusting arm of the throat-plate I passes also through
screw 28 will permit. A set screw 29 presses the said slot and by means of the tightening ac
against the spring 26, so that the tension of the tion of the usual screw, the knife 22 can be moved
latter and thereby the pressure against the guide in a horizontal direction whereby the cutting edge
member I‘! may be controlled. The resilient ar- ‘ of the knife may be adjustable relative to the 40
rangement has the advantage, that the guide edge usual cutting blade a. Knife 22 is so shaped,
I9 of the guide member I‘! yields as soon as a as is shown in Fig. 23, to permit it to be readily
cross seam passes. A stop 30, ?xed to the left mounted under the arm of the throat-plate I
hand side of the throat-plate I, carries a lateral without interfering with the movement of mem
projection 3| which extends until in front of bers relative to said throat-plate I and yet the 45
the stitch holes 32 for the needles producing the cutting edge of blade 22 can readily coact with
cover seam, and which serves to vertically fold knife a, whereby cloth 0 and d may be readily
the ridge of the seam, so that the latter may be cut by the scissors-like action of the knives a
covered in this position. In operation, the fabric and 22.
portions are fed into the sewing machine in such
Figures 12-19, inclusive, show a modification 50
a manner that the left hand fabric portion is of a throat-plate for a sewing machine, having
placed in an acute angle along a hem fold guide the three stitch holes for the needles arranged
30 and the right hand fabric portion in an obtuse in a single plane or in alignment, while Figures
angle along the guide member I ‘I. In this angular 20-30, inclusive, illustrate a construction of the
position, both fabric portions are trimmed, where
throat-plate for a sewing machine in which the 55
upon, they are fed towards the needle joining stitch hole for the middle needle is arranged in
them together. Should cross seams occur, that front of the two lateral stitch holes. Of course,
is to say, should by the thickening of the fabric the one modi?cation as well- as the other may be
the passage become too small, then the guide used for both positions of the needles.
edge I9 may resiliently move upwardly at two
The invention is, moreover, not intended to be 60
points and the guide member I‘! may resiliently limited to the illustrated modi?cations of the
ing machine.
20
25
30
40
45
(30
-
»
swing towards the right, thereby enlarging the
passage. From the needle joining the two fabric
portions the latter move, after the seam ridge has
been placed vertically by the projection 3| to the
covering needles. According to the nature of the
fabric to be sewn, the hem fold guide 30 may be
adjusted in a slot 5 and ?xed in the adjusted
position by means of the screw 6. This adjust
70 ment serves the purpose of controlling the width
at which piercing of the fabric is effected. The
right hand portion of stop I‘! is resiliently
mounted so as to yield on the occurrence of cross
seams. The spring pressure may be regulated by
means of the screw 29. A further screw 28 bear
throat-plate for sewing machines adapted for
feeding the fabric in the upward direction of the
arm, but may also be employed in connection with
65
any kind of throat-plates.
What I claim is:
1. A throat-plate for sewing machines com
prising a body portion, a pair of arms formed
with and extending from said body portion, said
arms being arranged parallel to one another to 70
provide a feed channel therebetween and each
having their upper faces lying in a plane flush
with that of the upper face of said body portion,
a hem fold guide member ?exibly connected to
one of said arms, an adjustable guide member 75
4
2,136,288
connected to the other of said arms and the
last mentioned arm having needle openings ar
ranged therein.
2. A throat-plate mechanism for sewing ma
v chines comprising an arcuate body portion ca
pable of being ?xedly connected to the carrier arm
of the sewing machine, a pair of spaced arms
formed with said arcuate portion providing a
guide channel therebetween, a hem fold guide
10 member resiliently supported upon one of said
arms, the upper faces of said hem fold guide
members and arms lying in a plane ?ush with
that of the upper face of said arcuate body por
tion, said throat-plate having needle openings
formed therein and a tongue portion formed with
the throat-plate about said needle openings ex—
tending in an elevated position above that of the
upper face of the throat-plate.
3. A throat-plate for sewing machines com
prising a body portion, a pair of arms formed
with and extending from said body portion, said
arms being arranged parallel to one another to
provide a feed channel therebetween and each
having their upper faces lying in a plane flush
with that of the upper face of said body portion,
a hem fold guide member ?exibly connected to
one of said arms, a guide member pivotally and
resiliently mounted upon the other of said arms 10
in such a manner that said guide member may
yield in a horizontal direction away from said
feed channel and the last mentioned arm having
needle openings arranged therein.
15
FRITZ EBERT.
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