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Патент USA US2126715

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Aug. 16, 1938.
2,126,715
J. F. ARVEYR
BLIND-STITCH ATTACHMENT FOR SEWING MACHINES
Filed Nov. 12, 1936
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Aug. 16, 1938.
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ARVER
'
2,126,715
BLIND-STITCH ATTACHMENT FOR SEWING MACHINES
Filed Nov. 12, 1936
_
2 Sheets-Sheet 2
INVEJYJWEI'
Patented Aug. 16, 1938
2,126,715
‘UNITED STATES PATENT, OFFICE
2,126,715
BLIND-STITCH ATTACHMENT FOR SEWING
MACHINES
.
Joseph 'F. Arver, ‘St. Paul, Minn., ,assignor to
Joseph F. Arver and Harold E. .Ruttenberg, cc
partners, doing business as Hidstitch Company,
St. ‘Paul, Minn.
Application November 12, 1936, Serial ,No. 110,469
9 Claims.
This invention relates to an attachment for
sewing machines and used for the purpose of
making certain kinds of stitching ‘known as blind
stitches and ‘well known in dress-making, tailor
ing and garment manufacture in general.
This device further comprises distinct im
,provements over my ‘U. S. patent application,
‘Serial Number 740,609 ?led August 20, 1934.
- The mechanisms involved are mounted on and
'10 associated :with ‘the presser ‘foot bar of a regular
sewing machine, the needle bar and the feed fork
‘mechanisms .of'such sewing machine and provide
‘for a horizontally ‘reciprocable needle action all
.designed for high speeds and silent action in
making blind-stitches of predetermined gage, as
hereinafter ‘fully set forth,‘ reference 'being ‘had
(Cl. 112—1'78)
bar 6 and needle bar ‘I, both reciprocable verti- ‘
cally as in usual sewing machine structure and.
well known in the art, my device utilizing the
‘needle bar ‘reciprocating action to impart hori
zontal needle reciprocation ‘in a plane parallel , UK
tothe table I ‘and over its cloth plate 4. Said
needle action provides successive penetrations of
the cloth 2 the latter being fed across the cloth
‘plate by the usual feed bar‘ 8 which reciprocates
‘under ‘the cloth ‘plate, being raised during rear 110
ward movement for its serrated feed dogs 8D to
‘contact and feed the cloth ‘rearward ‘between
cloth penetrating actions of the needle. During
forward movement of the feed dogs and bar'they
are lowered and the dogs are inactive until again :
Fig. 1 is a top view of the needle actuating
mechanism of my device as mounted on'the
presser footbar and needle bar of a sewing ma
raised for next cloth moving-step. Said feed bar,
the feed dogs-and manipulating means therefor
are well known in the art but herein described
and illustrated for the purpose of disclosing their
synchronized action and relation to various parts
chine, this ‘?gure showing the device'in operative
of my improved device.
to the accompanying drawings, in which:-- ‘ '
position :over the cloth plate and adjacent table
parts of the sewing ‘machine. Fig.‘ 2 is a front
elevation of, ‘Fig. 1 and showing additionally, in
25 section, certain vfeed mechanisms below the cloth
plate, as on line 2-2 in Fig. 1. ' Fig. 3 is a left
.end elevation of Fig. '2. Fig. 4 is a fragmentary
view of the outer end portion of a sewing machine
‘
I
My device involves aspecial presser foot mem
ber comprising an vL-shaped plate 9 elongated in
‘direction transversely of the direction of the
cloth “movement, its‘ Vertical arm comprising in 25
part a socket 9A in the bore of ‘which the lower
end of the presser ‘foot bar '6 is removably're
‘tained as at '9B.
I
,
‘
The vertical part of‘ said presser foot comprises
plate removed ‘to ‘reveal certain details of the further avertical wall or plate ‘9B’ (see Fig. 2) 30
stitch length'regulating means.
Fig. 5 is an against the‘ front face of which is slidably en
under side or bottom view as on line 13-43 in Fig. gaged a‘ horizontally reciprocable plate Illv by
2 showing certain plunger actuating means of my such means‘ as a pair of button-head screws ill
device. Fig. 6 is ,a ‘sectional detail view as on or equivalent vthereof at the upper edge of plate
*I‘O, other means hereinafter described guiding 35
35 lined-6 in'Fig.‘2. Figs. 7, 8 and 9 are diagram
matic top views of the successive needle actions the lower edge part of plate It) slidably Where the
and stitch "forming steps involved in the‘use of upright and horizontal plate parts of the presser
my device and Fig. 10 is an enlarged sectional foot member converge. The numeral '9 herein
view as :on line Ill-l0 in Fig. 4 and showing after designates the elongated lower plate of ‘the
additionally apiece of cloth 2, slightly in perspec
presser foot member. ‘
‘
‘
The needle [2 is removably and adjustably
tive, being stitched.
‘
' Referring to- the drawings by reference ?xed parallel and close to the upper side of plate
9 its point directed toward the left (see Figs. 1
numerals, :l designates the table or Working sur
face of a ‘sewing machine and in the outer or and 12‘) penetrating the cloth 2 which is humped
left end part ‘of which stitching is done in cloth upwardly in the path of the needle by means of
a vertically reciprocable plunger l3 mounted be
2 fed and ‘moved rearwardly in direction of ar
row 3 ‘(Figs_,"1 and 3) under the presser foot low the cloth ‘plate ‘4 and projectible upwardly
of ‘the machine. ‘4 is a removably ?xed cloth therethrough in timed relation to the needle
plate in common plane ‘with table ‘1| and which action, said timed'action of the plunger being
accomplished by means of the feed bar action as 50
in my‘ device is .of special construction and re
places the regular cloth plate of a sewing ma
will presently ‘be described. The upper end of
table as on ‘line 4-'--4 in Fig. 2, with the ‘cloth
55
chine.
the plunger [3 is formed in its left half as a
5 (in Figs. ‘2 and 3) designates the lower, outer
extremity (of ‘the sewing machine ‘head from
shoulder ISS and is right half rounded down
wardly from the diametrical top edge‘ thus
formed, said top edge provided at ‘the middle with
which project downwardly the usual Pre$§e.r';foot
5.5
2
2,126,715
a notch I3N traversed by the needle during each
over or above the cloth plate, being actuated di
cloth penetrating action.
rectly by the needle bar, which action is of course
98 (Fig. 2) is a slot in the presser foot plate 9,
vertically over the upper end of plunger I3 and
so located that the squared shoulder part of the
scribed.
plunger is projected upwardly thereinto and
projecting the cloth upward accordingly over and
on the said upper end of the plunger and in the
path of the needle I2 as the presser foot comes
10 down and the needle comes forward (to the left)‘
and simultaneously penetrates the cloth thus
raised in two places, one at each side of the notch
of the plunger (see Figs. 2 and 10). The dash
line I2 in Fig. 10 designates the path of the
synchronized with the cloth feeding means de
I will now describe in detail the needle
action means.
The reciprocable upright plate I0 is provided in
termediate its ends with a diagonal slot IDS en
gaged by a suitable horizontal projection 28F of
the block 28 removably secured as at 29 to the
lower end part of the needle bar ‘I. The length 10
of slot IDS, extent of reciprocation of the needle
bar 1, determines the horizontal stroke of plate
Ill. The needle is preferably clamped at its heavy
end in the horizontal base 308 of an L-shaped
needle and most clearly shows the. cloth pene
bracket 30 the vertical part of which is adjustably
trating action.
retained ?at against the forward face of plate I0
Subsequently as the needle is withdrawn, dur
near its right end, said adjustable means com
ing movement to the right, the presser foot 9 is prising an'upper eccentric screw 3| and two lower
raised by upward movement of the feed dogs 8D 7 screws 32 (see Figs. 1 and 2) the latter passing
the plunger I3 moves down and the feed dogs through slots in the bracket 30. Adjustment of 20
move the cloth readwardly one stitch length.
eccentric3I and screws 32 enables an operator to
The plunger I3 is retained in a bore of a verti
cally disposed block I4 secured at I5 to the under
side of my special cloth plate 4 said bore being
25 enlarged in lower- part‘of the block to permit a
compression coil spring I6 about the plunger
yieldably pressing the plunger downwardly, the
plunger extending out of the lower end of the
block and its exposed'lower end continuously and
30 yieldably contacted by _a roller I ‘I. Said roller is
mounted at the free end of an arm I8 bearing up
wardly yieldably‘by means of a spring I 88, the
other end of said arm pivotally connected at I9
to the lower free end of an inverted L-shaped
35 actuator lever 20 the upper end of which is piv
otally secured at 2I to housing I4. At the elbow
of said actuator lever is ?xed a roller projection
20R, (see Figs. 2, 3 and 5) bearing upwardly and
contacting the stem part of a T-shaped cam 22
At) secured on the under-side of a plate 23 ?xed at 24
to the feed bar 8 (see Figs. 2 and 5) and extend
ing in horizontal plane to the left from said bar.
This ?xed plate 23 is pivotally connected at 25 to
a lever 26 comprising an elongated flat metal bar
under the cloth plate .4 and pivotally connected
set the needle accurately or as needed to traverse
the notch in the plunger I3.
It will be under
stood of course that the needle point is directed
toward the left.
'
33 is a thread extending from a spool (not
shown) to a tension wheel 34 (Fig. 2) on the ma
chine head, thence down to and through an aper
ture 38A in clamp 30, thence along the under side
of the needle and upthrough its eye (see Figs. 30
2, '7, 8 and 9).
i
-
35 is a flat metal block ?xed transversely on
the base plate 9 this block being L-shaped and
having an arm 35A ?xed in parallel relation to
the inner edge and upright part of SE to slidably
guide and retain the lower edge of plate I 0 there
between. The central part of said transverse
block is in the path of the needle and is notched
at its under side to permit reciprocation of the
needle therein, as at 35N in Fig. 6, where an X in L
the notch indicates the needle position. During
stitch forming operations'the needle point is re
ciprocated through said block and past it to the
left and under an oscillatable ?nger plate 36 in
co-operation with which the needle acts to make
and inter-lock thread loops at the left side of the
plunger where the needle emerges at each pene
tration.
to the latter near its outer end on a-pivot 2'! on
which it has a limited vertical free action. Said
lever 26 extends inwardly, riding freely on top of
the feed bar 8 (see Fig. 2) and its inner end car
The loop forming ?nger plate 36, hereinafter
ries slidably and pivotally, as at 23P (Fig. 4) , an ’ designated the looper is an elongated flat metal
integrally formed‘cloth feeding dog 8D guidingly plate pivoted on and near the left end of base
retained in slots 48 in the cloth plate 4. The lever plate 9 as at 31 (see Figs. 1, 7, 8 and 9) and di
26 and its dog 8D are of course reciprocated by rected toward the right therefrom its latter end
motion of the feed bar 8 through its plate 23 and
55 pivot 25 in thelever 26, said pivots 25 and 231?
having slidable mounting, to permit straight re
ciprocating action of the feed dog 8D and plate 23.
The slight vertical freedom, of parts just de
scribed, on pivot 21 is to allow the feed dogs to
60 move up and down with the feed fork.
It will now be understood that the cam action
of the T-shaped cam 22 contacting roller 20R
while reciprocating over the latter, provides a
certain rise and fall of said roller, which move—
65 ment'transmitted to lever 20 causes the latter to
swing at its lower end and oscillates the roller I‘!
in vertical plane, the roller in turn raising the
plunger I3 at correct time for'the cloth penetrat
ing action previously described. Release of said
70 cam contact with roller 20R allows spring I 6 to
function and pressing the plunger down out of the
path of the needle, this taking place and the
plunger remaining retracted as the cloth is moved
rearward each step or stitch.
The needle reciprocating means are entirely
75
formed with a forwardly directed, tapered and
suitably curved ?nger 36F which is oscillated
across the path of the needle point and said en
tire ?nger plate is normally spring pressed rear
wardly by any suitable'means such as the wire
spring arm 38 ?xed in a post 39 on base 9.
The
looper bears rea'rwardly continuously against a
cam bar 48 ?xed as at 4| on the lower inner face
of the slide plate III, the said bar having a cam
shoulder 403 near its right end. An upright peg
3GP on the looper engages said cam bar and as the
plate I0 reciprocates the said pin rides the cam
bar causing the looper to be oscillated when rid
ing the shoulder 40S, thus oscillating the ?nger
36F across-the path of the needleand directly over
it. This looper member may have reciprocating
action instead of oscillating or any equivalent 70
thereof.
Assuming now that the needle is about to make
a penetration of the cloth 2 starting from ex
treme ‘right position (Fig. 7) the looper 36F is
at this time in extreme’iorward position. The 75
2,126;715
3
needle ?rst moves‘ to‘ the‘ left to‘ contact the
cloth (dotted position‘ Fig. 7) and plunger I3
stitched in proper‘ relation to the penetrating
is upholding the cloth in inverted U or V form
for feeding and guiding the goods accurately.
Referring again to the vertically reciprocable
plunger I37 and its yieldable upward pressure,
in the path of the needle which penetrates the
cloth to the right of the plunger then passes
to left in the notch of the plunger anclpi‘erces
the cloth alsoin the‘ path of the needle at the left
side of said notch. This action brings the needle
point, with two bights of thread, out to th‘e'left
‘110 as the looper 35F is moved’ rearward over the
needle as peg‘ 3’6P at this‘ instant rides back
on shoulder MS of cam bar 40. In Fig.‘ 8 the
loo’per ?nger is directly over‘ the needle and
in Fig. 9 it is clear of it rearwardly with its
prong directed toward the‘ upper‘ adjacent side
of the needle. As positioned in Fig. 9 the needle
is at extreme left position, exposing one bight
of the thread on top of the‘need'le and another
bight under it.
‘
. _
Now when the needle starts back (to right)‘
the thread on top of it is made slack and ?nger
3%‘ starting forward enters between said thread
and the needle and as the latter‘ is retracted out
of the goods the cloth is fedback one‘ step by
the feed bar 8, the ?nger 36F retains the thread
on it in the form of an elongated loop (desig
nated 33L in Figs. 7, 8 and 9) extending from
the just completed cloth ,penetrationan'd for
ward, the forward end of said’ loop remaining
30 on the ?nger and becomes slack when the looper
starts to move back on the shoulder of the cam
bar All and said loop is penetrated by. the next
forward movement of the needle, the said thread
action or in other words it is an auxiliary medium
said pressure‘ as described, automatically engages
any thickness or thicknesses of cloth or various
kinds of cloth and the correct relative position
or location of the notch in the plunger and the
needle path therethrough is maintained.
right side of the goods. It is clear that upward
movement of the plunger brings the angle of
its shoulder directly under the presser foot plate.
It will be readily understood that the stitching
action of my device may be reverse to that shown,
or from left to right and‘ other mechanical de
tails within the scope and spirit of my invention
may be used.
I claim:
1. A blind-stitch attachment for sewing ma
chines having a vertically reciprocable presser
foot bar and a vertically reciprocable needle bar,
a cloth plate and table in common plane there- .
below, a reciprocating feed bar and feed dogs
actuated thereby and projectible through the
cloth plate to contact and feed cloth rearwardly
under the needle bar, the action of said f'e-ed bar
synchronized with relation .to the needle bar;
said attachment comprising over the cloth plate 30
an elongated presser foot or" L-shape in cross
section and removably ?xed on the presser foot
bar, a vertically disposed needle actuator plate
loop being released from the ?nger by itsmovee
ment to the right caused by the thread of the
loop being guided tov the right by the needle
contact and the edge of an aperture 35A’ in the
slidably retained in parallel relation to the ver
tical‘ part of‘ the presser foot, means on the
needle bar for engaging said actuator plate and
transverse plate 35 and the rearward movement
of the cloth by the feed fork. SS is a slot in
the said actuator plate, means on said actuator
plate 9 registering vertically with aperture35A’
parallel relation to it,‘ at its base and in proximity
to' the presser foot base‘, meansmounted at the
just described (see Figs. 1 and 2).
.
\
,
'
Thus there are two strands of thread ineach
cloth penetration,_ and one strand at the right
from one penetration to the next,.while on the
left is formed a row of interlocked thread loops
33L in a row parallel to the single strands, form;
ing the blind stitching.
l l
'
-
The yieldable spring and roller actuated
plunger it automatically compensates for varye
ing thickness of goods passingjover the plunger
and the needle in any‘ case penetrates the goods
so closely to the underside of the goods that
when the goods are removed from the machine
the said points of penetration reveal little or
none of the thread on said side. If thread is
used of a color similar to the color of the goods
the penetrations are to all intents and purposes
invisible, a desirable feature in certain garment
manufacture.
60
In Fig. 10 a folded hem of a piece of goods 2
is shown in the process of being blind-stitched
and illustrating that the looped parts of the
blind stitches are completely hidden when the
goods are ?attened out, and to the left in said
Fig. 10 is shown a row of stitches exposed on a
single thickness of cloth.
My presser foot has a slight vertical action
corresponding to that in standard sewing ma
chines and the feed bar and dogs have corre
sponding functions and are timed for proper
action as is well known in the art.
In Figs. 2, 3 and 6, 9R designates a transverse
rib on the under side of the presser foot plate
9 and in proximity to the plunger, this for the
75 purpose of engaging and alining the goods being
10
This assures minimum exposure of thread on
imparting horizontal reciprocating movement to
for adjustably and rigidly retaining a needle in
under side of the cloth plate including an up
right plunger projectible, upwardly yieldably in
the path of the reciprocating needle to press
goods to be stitched upwardly in ridge formation
over the cloth plate, said plunger notched cen»
trally and traversed by the needle penetrating
the goods at both sides thereof, said needle
threaded to penetrate the goods with a double
big-ht thereof and means mounted on the presser
foot to engage the thread near the point of the
needle and form ‘successive interlocked ‘loops of
thread in a row on the surface of the goods where
the needle point emerges.
2. The structure speci?ed in claim 1, said
plunger formed at its top end with a shoulder,
said presser foot having a slot toward whichv
said shoulder part is projected by the upward
movement of the plunger.
3. The structure speci?ed in claim 1, in which (50
said actuator plate reciprocating means com
prises a block ?xed on the lower end of the needle
bar of the sewing machine, said actuator plate
being provided with an inclined slot slidably en
gaged by said block.
4. The structure speci?ed in claim 1, in which
the direction of reciprocating movement of the
needle is transversely of the direction of the ac
tion of the feed bar and feed dog action of the
sewing machine.
5. The structure speci?ed in claim 1, and. an
oscillatable cloth-feed lever member pivoted at
the underside of the cloth plate near its outer
end and extending toward and over the sewing
machine feed bar, a feed dog member carried 75
4
2,126,715
by the free end of said lever said feed dog pro
vided with serrated parts projectible through and
guided in slots provided in the cloth plate, and a
slotted pivotal connection in said feed dog end
part, a plate rigidly secured to the feed bar and
having a variably adjustable pivot connection
10
holder for the thread to extend downwardly
therethrough thence longitudinally under the
needle and upwardly through its eye to provide a
double bight of thread in the penetrated material,
a thread-loop forming ?nger member manipu
lated by the actuator plate to engage a bight of
with said cloth feed lever intermediate the ends
said thread over the needle when the latter pro
of the latter, to provide selective feed dog ‘move
jects through the material to form a thread loop
ment for stitch lengths as required.
6. The structure speci?ed in claim 1, and an
oscillatable cloth-feed lever member pivoted at
the under side of the cloth plate near its outer
end, extending toward and over the feed bar, a
feed dog member carried by the free end of said
next penetration, said loop retained in the path 10
of the needle making the next penetration
through said loop, and means for releasing said
loop from the ?nger before next loop forming
15 lever, said feed dog provided with serrated parts
projectible through and guided in slots provided
in the cloth plate, and a slotted pivotal connec
tion in said feed dog part with said lever, a plate
rigidly secured to the feed bar and having longi
20 tudinally adjustable pivot connection with said
cloth feed lever intermediate the ends of the lat
ter, to provide selective movement of the feed
dogs, the pivot of said feed dog lever comprising
a vertically disposed headed pin longer than the
25 pivot part of the lever journaled thereon, for the
purpose set forth.
_
7. A blind-stitch attachment for sewing ma
chines having vertically reciprocable presser foot
and needle bars over a sewing table and cloth
30 plate therein, a horizontal and vertically recipro
cable feed bar under the cloth plate and means
for synchronizing the feed bar movements with
relation to the needle bar movements; a presser
foot secured on the lower end of the presser foot
35 bar, a vertically disposed actuator slidably re
tained in said presser foot in proximity to the
needle bar, means connecting the needle bar and
said actuator to provide horizontal reciprocation
and retain the same until the needle makes the
action.
8. The structure speci?ed in claim 7, in which 15
said loop-forming ?nger member comprises a
horizontally oscillatable elongated member piv
oted on the presser foot base its free end formed
with a transversely arcuate, forwardly directed
and tapered ?nger oscillatable in the path of the 20
needle and over it to engage the thread on top
of the needle as the latter is positioned there~
under and the ?nger point is actuated forwardly.
9. A blind-stitch attachment for sewing ma
chines having vertically disposed, parallel and
reciprocable bars, a horizontal table therebelow
and cloth feeding means operating intermittently
and in synchronization with said bars, a rela~
tively rigid frame mounted on one bar, a needle
retaining member slidably mounted in said frame
and means mounted on the other bar to produce
a needle in horizontal direction over the hori
zontal table, means for feeding cloth rearwardly
on the table under the presser foot in successive
steps and selective length of movement, and cloth
of the actuator, a needle holder on said actuator
contact means mounted under said table and
and reciprocable accordingly in a horizontal
plane, means for guiding and feeding cloth ma
terial under said needle on the cloth plate in a
projectable upward at predetermined intervals to
press the cloth upward in inverted channel shape
and in the path of the reciprocating needle to
provide double penetration of said raised cloth
direction transverse of the needle action, plunger
and means mounted on said presser foot member
50
said needle ?xed with its eye vertically directed,
thread guide means for thread extending under
tension from a source of supply and comprising
the provision of a vertical aperture in the needle
30
horizontally reciprocating movement of the nee
dle member, said latter member comprising in
part an adjustable needle holding clamp to hold
40 to hold a straight needle in horizontal direction
means for projecting said material upwardly in
the path of the needle in an inverted V-form to
cause double penetration of the material by the
needle and means for retracting said plunger
when the needle is withdrawn from the material,
25
adjacent the extreme forward position of the nee
dle to engage the thread on said needle and form ‘
a thread loop during and after retraction move
ment of the needle, said loop forming means ar
ranged to hold said loop and subsequently release
said thread loop during the neXt penetrating
action of the needle.
JOSEPH F. ARVER.
i)
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