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Патент USA US2136164

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Nov. 8, 1938.
2,136,164
P. EOGUHN
BLIND STITCHING ATTACHMENT FOR SEWING MACHINES
2 Sheets-Sheet 1
Filed June 9, 1937
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Nov. 8, 1938.
P. BOGUHN
2,136,164
BLIND STITCHING ATTACHMENT FOR SEWING MACHINES
Filed June 9, 1957
2 Sheets-Sheet 2
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2,136,164
Patented Nov. 8, 1938
UNITED STATES PATENT OFFICE.
2,136,164
BLIND-STITCHING ATTACHIVEENT FOR SEW
ING MACHINES
Paul Boguhn, Berlin-Spanish; Germany, assign
or to The Singer Manufacturing: Company,
Elizabeth, N. J., a corporationoi? New. Jersey
Application June 9, 1937, Serial No. 147,165
In Austria March 31, I937
10 Claims.
This invention relates to blind-stitching at
tachments for sewing machines of the type com
prising a work-guide over and under which the
work is folded for presentation to the machine
5
bracket 4, spring washers 6 being interposed
ment of the sewing machine feed-dog whereby
by means of a pin ‘I with a yoke 12 which is
secured, for example, by means of screws M
to the base member is of the work guide, the
to relieve or to discontinue pressure of the abut
pin 1 passing through apertures in lugs 8, 9 of
ment against the work during the feeding stroke.
the bracket 4 and also through apertures in the
lugs HI, H of the yoke I2. The guide frame 3
is provided adjacent to the pin 1 with a down
turned lug l6 having an aperture penetrated
by a headed screw l5 secured to said lug by
positively actuated in dependence on the move
A further object is to ensure exact guidance
and adjustment of the work under conditions
which will avoid undue wear of the parts of the
attachment.
According to the invention the abutment is
means of nuts I‘! and threaded into an inter
operatively connected with a lever presenting
nally threaded transverse ori?ce in the pin ‘I.
an inclined portion cooperative with a station
ary face that may be presented by a slot or open
As the screw [5 is held by the nuts I‘! against
displacement in axial direction relatively to the
lug 16, by rotation of the screw Hi, there is 20
effected longitudinal shift of the guide frame 3
relatively to the base member l3. As the base
ing in the throat-plate penetrated by said in
clined portion.
In a preferred embodiment of the invention,
the carrier for the abutment is detachably se
cured to the sewing machine presser bar and
includes a part formed as a presser foot.
The
lever is pivoted to the carrier and is ?tted with
an adjustable slide presenting a pivot pin on
which is mounted a guide plate passing through
a slot in the carrier.
w)
lines in Fig. 4. The guide frame 3 is carried
by a bracket 4 to which it is connected by screws
5 passing through elongated holes in said
needle, and a cooperating yielding abutment, - between the heads of the screws 5 and the
and has for an object to provide a simple and bracket 4. The bracket 4 is hingedly connected
compact construction in which the abutment is
E:
(Cl. 112-176)
The abutment passes
through slots in the guide plate, being guided
also by a pin uprising from the guide plate. _A
guide frame or work-guide proper presenting an
edge-portion over and under which the work
is folded is hingedly connected to a yoke fixed
in relation to the bed-plate and is adjustable
by manipulation of an adjusting screw engaging
the hinge pin. The guide frame is subject to
the action of a spring tending to lift said guide
frame away from the machine bed-plate where
by introduction of the work is facilitated.
In the accompanying drawings which illus
trate by way of example an embodiment of the
invention, Fig. 1 is a part side elevation part
vertical section of the attachment, Fig. 2 is a
45 plan, Figs. 3 and 4 are fragmentary views show
ing the parts in two different positions of the
abutment. Fig. 5 is a fragmentary view show
ing two superposed and folded fabric plies se
cured to one another by a blind seam. Fig. 6
shows the fabric plies unfolded.
The device shown comprises a guide frame 3
or guide proper having an aperture 2 bounded
by an edge-portion I over and under which the
fabric plies a, b to be blind—stitched are folded
55 as indicated in dotted lines in Fig. l, and in full
member 13 is ?tted to the machine bed in sub
stitution for the usual cover slide plate and is
anchored by the plate IB and screws l9 to the 25
machine bed-plate, there is thus rendered pos
sible displacement of the guide frame 3 rela
tively to the machine needle, whereby there may
be effected ?ne adjustment, such as is rquired
for different thicknesses of the work. Between
the guide frame 3 and the base member I3 there
is interposed adjacent to the pin 1 a spring 20
which tends continuously to lift the guide frame
3 away from the base member '3, thereby facili
tating introduction of the work.
The carrier for the abutment cooperating with
the guide frame is secured to the machine
presser bar 5|] of the sewing machine, for ex—
ample, by means of a clamping screw 5!. In
the embodiment illustrated, the carrier 2| has a 40
part 22 formed as a presser foot having a sole
portion disposed above the feed-dog 53.
oted to the carrier 2| by means of a shouldered
screw 23! secured by a nut 24 is an actuating
lever 25 having at its lower end an inclined de
pending tail or guide portion 26 which pene
trates a slot 21 in the throat-plate 28 and is
guided thereby.
Formed in the lever 25 is a guideway 29 in
which is received a slide 3! presenting a pivot
pin 30. The said slide 3| is adjustable length
wise of the guideway 29 and is adapted to be
secured in its position of adjustment by means
of a screw 32 which passes through an elon
gated slot 33 in the slide.
Pivoted on the pin 55
2
2,136,164
30 is a guide plate 34 which is secured against
withdrawal from the pin 30 by a cotter 31. This
guide plate 34 has at its free end a tongue 35
which passes through a slot 36 in the lower end
of the carrier 2| directly above the sole por
tion of the presser foot 22 so as to be supported
by the latter. A stop 38 ?tted to the end of
the tongue 35 limits the movement of the tongue
35 in the slot 36.
In the rocking movement of the lever 25 about
the pivot 23, the guide-plate 34 is shifted rela
tively to the carrier 2| and to the presser foot
22.
Secured to the guide-plate 34 is an up
right pin 39.
The guide-plate 34 is further pro
vided with a slot 40 for the passage of the needle
54, and with slots 4|, 42 penetrated by depend
ing prongs 44 of the abutment plate. The abut
ment plate is subject to the downward pressure
of a spring 45 abutting at its lower end on a
lug 43 of said plate and at its upper end against
a cotter 46 ?tted to the pin 33. Slots 41 and
48 in the guide-plate 34 serve for guiding the
thread. A slot 49 in the abutment plate pre
sents a free passage for the vibratory needle
lu CA 54 in case the fabric is not to be pierced during
the vibration of the needle.
With the described construction and arrange
ment of the parts the abutment is continuously
urged towards the throat-plate 28, and during
the blind stitching operation the fabric plies to
be blind-stitched and folded around the edge
portion 1 are pressed by means of the presser
foot 22 towards the throat-plate 28 or the feed
dog 53. Accordingly, when the carrier 2| is
,7 pushed away from the throat-plate 28 together
with the Work by the rising movement of the
fecd~dog 53 through the usual feed slots in the
throat-plate 28, and when the carrier 2| is again.
lowered towards the throat-plate on the descent
of the feed-dog, the abutment is displaced lat
erally during such vertical movement by the ac
tion of the inclined tail portion 26 of the lever
25 guided in the slot 21 of the throat-plate. The
inclination of the tail portion 26 of the lever 25
45 is such that, in the ascent of the carrier 2|, the
abutment is moved laterally in the direction
away from the needle, and, in the descent of
the carrier, is again moved towards the needle.
In this way, there are effected the necessary
movements for relieving or discontinuing the
pressure on the work during the feeding stroke.
I claim:
1. In a sewing machine having stitch-forming
mechanism including a needle and feeding mech
anism including a feed-dog, the combination with
a work-guide over and under which the work
is folded for presentation to said needle, of a
yielding abutment co-operative with said work
(ill
guide, a vertically movable carrier for said abut
ment, said carrier having a part adapted to be
lifted by said feed-dog, and a lever operatively
connected with said carrier, said lever having an.
inclined part functioning as a wedge to impart
lateral movement to said abutment in the lift
ing movement of said carrier.
2. In a sewing machine having stitch-forming
mechanism including a needle and feeding mech
anism including a feed-dog, and a slotted throat
plate above said feed-dog, the combination with
a work-guide over and under which the work is
folded for presentation to said needle, of a yield
ing abutment co-operative with said work-guide,
a vertically movable carrier for said abutment,
said carrier having a part adapted to be lifted
by said feed-dog, and a lever operatively con
nected with said carrier, said lever having an
inclined depending part penetrating a slot in
said throat-plate and functioning as a wedge to
impart lateral movement to said abutment in
the lifting movement of said carrier.
3. In a sewing machine having stitch-forming
mechanism including a needle and feeding mech
anism including a feed-dog, and a Dresser-bar,
the combination with a work-guide over and
under which the work is folded for presentation 10
to said needle, of a yielding abutment coopera
tive with said work-guide, a vertically movable
carrier for said abutment, said carrier being at
tached to said presser bar and having a part
adapted to be lifted by said feed-dog, and a le
ver operatively connected with said carrier, said
lever having an inclined part functioning as a
wedge to impart lateral movement to said abut
ment in the lifting movement of said carrier.
4. In a sewing machine having stitch-forming
mechanism including a needle and feeding mech
anism including a feed-dog, the combination
with a work-guide over and under which the
work is folded for presentation to said needle,
of a yielding abutment co-operative with said 25
work-guide, a vertically movable carrier for said
abutment, said carrier having a part formed as
a presser-foot and adapted to be lifted by said
feed-dog, and a lever operatively connected with
said carrier. said lever having an inclined part 30
functioning as a wedge to impart lateral move
ment to said abutment in the lifting movement
of said carrier.
5. In a sewing machine having stitch-form
ing mechanism including a needle and feeding
mechanism including a feed?dog, the combina
tion with a work-guide over and under which
the work is folded for presentation to said nee
dle, of a yielding abutment cooperative with said
work-guide, a vertically movable carrier for said 40
abutment, said carrier having a part adapted
to be lifted by said feed-dog, and a lever piv
otally connected to said carrier, said lever hav
ing an inclined part functioning as a Wedge to
impart lateral movement to said abutment in the 45
lifting movement of said carrier.
6. In a sewing machine having stitch-form
ing mechanism including a needle and feeding
mechanism including a feed-dog, the combina
tion with a work-guide over and under which the
50
work is folded for presentation to said needle,
of a yielding abutment cooperative with said
work-guide, a vertically movable carrier for said
abutment, said carrier having a part adapted to
be lifted by said feed-dog, a lever operatively 55
connected with said carrier, a guide-plate sup
ported by said lever and sustaining said abutment,
said lever having an inclined part functioning as
a wedge to impart lateral movement to said abut
ment in the lifting movement of said carrier.
60
7. In a sewing machine having stitch-form
ing mechanism including a needle and feeding
mechanism including a feed-dog, the combina
tion with a work-guide over and under which the
work is folded for presentation to said needle, of 65
a yielding abutment co-operative with said work
gulde, a vertically movable carrier for said abut
ment, said carrier formed with a slot and hav
ing a part adapted to be lifted by said feed-dog,
a lever operatively connected with said carrier, 70
a slide adjustably supported by said lever, a
pivot on said slide, and a guide-plate mounted
on said pivot, said guide-plate passing through
the slot in said carrier and sustaining said abut
ment, said lever having an inclined part func
75
2,136,164
tioning as a wedge to impart lateral movement
to said abutment in the lifting movement of said
carrier.
8. In a sewing machine having stitch-forming
mechanism including a needle and feeding mech
anism including a feed-dog, the combination with
a Work-guide over and under which the work
is folded for presentation to said needle, of a
yielding abutment cc-operative with said work
guide, a vertically movable carrier for said abut
ment, said carrier having a part adapted to be
lifted by said feed-dog, a lever operatively con
nected with said carrier, a slide adjustably sup
ported by said lever, a pivot on said slide, and
a guide-plate on said pivot, said guide-plate
formed with slots and sustaining said yielding
abutment, said abutment penetrating the slots
in said guide-plate, said lever having an inclined
part functioning as a wedge to impart lateral
20 movement to said abutment in the lifting move
ment of said carrier.
9. In a sewing machine having stitch-form
ing mechanism including a vibratory needle and
feeding mechanism including a feed-dog, the
combination with a Work-guide comprising a base
member, a guide proper, over and under which
the work is folded for presentation to said nee
die, a hinge pin connecting said guide proper
to said base member, and a screw penetrating
3
said guide proper and threaded into said hinge
pin for effecting adjustment of said guide proper
relatively to said base member, of a yielding
abutment co-operative with said work-guide, a
vertically movable carrier for said abutment,
said carrier having a part adapted to be lifted
by said feed-dog, and a lever operatively con
nected with said carrier, said lever having an
inclined part functioning as a wedge to impart
lateral movement to said abutment in the lift 10
ing movement of said carrier.
10. In a sewing machine having stitch-form
ing mechanism including a vibratory needle and
feeding mechanism including a feed-dog, the
combination with a work-guide comprising a base 15
member, a guide proper hinged to said base mem
her, over and under which guide proper the work
is folded for presentation to said needle, and a
spring urging said guide proper away from said
base member, of a yielding abutment co-operatve 20
with said work-guide, a vertically movable car
rier for said abutment, said carrier having a part
adapted to be lifted by said feed-dog, and a le
ver operatively connected with said carrier, said
lever having an inclined part functioning as a 25
wedge to impart lateral movement to said abut
ment in the lifting movement of said carrier.
PAUL BOGUHN.
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