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Патент USA US2132791

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Oct. 11, 1938;
R, $_ KELSO
‘
2,132,791
BLIND STITCH SEWING MACHINE
Filed Jan. 4, 1936
6 Sheets-Sheet l
Oct. 11, 1938.
R. s. KELSO
2,132,791
BLIND STITCH SEWING MACHINE
'
Filed Jan. 4, 1936
6 Sheets-Sheet 2
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Oct. 11, 192,23.v
R. s. KELSO
'
2,132,791
BLIND STITCH SEWING MACHINE
Filed Jan. 4, 1936'
6 Sheets-Sheet 5
Oct. 11, 1938.
R. s. KELSO
2,132,791
BLIND STITCH SEWING MACHINE
Filed Jan. 4, 1936
6 Sheets-Sheet 4
Oct. 11, 1938.
R. S. KELSO
’
2,132,791
BLIND STITCH SEWING MACHINE
Filed Jan. 4, 1936.
6 Sheets-Sheet 5
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Oct. 11, 1938.
R
KELSO
2,132,791
BLIND STITCH SEWING MACHINE
‘Filed Jan. 4, 1936
6 Sheets-Sheet 6
Patented Oct. 11, 1938
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UNITED STATES PATENT OFFICE
2,132,’! 91
BLIND‘ STITCH SEWING MACHINE
Ralph Simpson Kelso,‘ St. Louis, Mo., assignor to
Lewis Invisible Stitch Machine Company, St.
Louis, Mo., a corporation of Maine
Application January 4, 1936, Serial No. 57,613
22 Claims. (Cl. 112-176)
This invention relates to new and useful improvements in blind stitch sewing machines generally, although more particularly to blind stitch
sewing machines employed in hemming opera-
5 tions.
.
rI‘he principal object of the invention is to
provide a blind stitch sewing machine of the
double thread chain stitch type for seaming hems,
by means of which a line of stitches will be formed
1G to unite the hem fold to the body fabric, the
connecting portions of the needle thread between
adjacent needle loops being positioned in a
straight line in parallelism with the inner edge of
the hem and the enchained looper thread loops
Figure 7 is a detail view showing the driving 5
connection between the main shaft and the oscil
latory ridge carrying shaft,
1
Figure 8 is a detail elevation showing the reduc
tion gear coupling between the main shaft and
the pitrnan which oscillates the looper carrying 10
shaft,
Figure 8a is an elevation of the driving diSe,
Figure 9 is a detail elevation of the top feed
mechanism, the view showing particularly the
being disposed under the inner edge of the hem
means for imparting up and down movements to 15
and thereby concealed from view.‘
the feed dog,
Another important object of my invention ‘lies
in the provision of a threaded non-avoiding reciprocatory looper which cooperates with a neezorrile mounted for reciprocation across therline of
feed, the looper having a path of travel in a
single straight line in the line of feed and being
located entirely on that side of the ridge forming
element opposite the point of needle penetration
25in thefabric, whereby the feed of the fabric and
the rearward stroke of the needle will effect ‘the
opening of the loo-per thread loop for entrance
by the need1e_
4
nee d1 e
t
mead 100p’ and to decrease the . speed
.
travel of the looper during
the ?rst part of its
backward stroke
to thereby better. insure the
.
needle entering the looper thread triangle.
'
Figure 10 is a detail View Showing the mecha
niSm for imparting the back and forth move
ments to the feed deg,
Figure 11 is a bottom plan view of the for- 20
Wardly extending arm showing particularly the
Dresser foot, the looper mechanism, and the top
feed- mechanism,
Figure 12 is a top P1311 View Of the Presser foot,
Figure 13 is an enlarged view showing a hem 25
Seamed by my invention,
Figure 14 is an enlarged View of the Presser
foot, the needle, and the fabric being hemmed,
A further object of the inventioh lies in the
30- provision of means for reciprocating the looper
whereby the speed travel of the looper during the
last part of its forward. stroke will be increased
to thereby better insure the looper entering the
35
tween the main shaft and the 4-motion top feed,
and between the main shaft and the looper,
Figure 6 is a diagram showing the variable
looper speed travel,
'
’
With these and other objects in view which will
more fully app‘ear’the nature of the invention will
40 be more clearly understood by following the de-
s‘crip‘tion' the appended claims’ and the several
vicws illustrated in the accompanying drawings.
In the drawings:
the view showing the looper at the rear end of its
stroke and the needle at the forward end of its 30
stroke’
Figure 15. is a’ Similar View but Showing the
looper movmg forwardly through the needle
thread loop,
Figure 16 1s
a similar
view
but showing the 35
.
.
.
.
_
.
looper at
a‘? the
the end
forwar-d
of Its stroke,
Stroke and
and
needle
of its end
backward
the
Figure 17 is a Similar View but showing the
looper being moved rearwardly and the needle
in a position about to enter the looper thread it
10op_
Like reference numerals designate correspond
mg Darts throughout the several ?gures of the
drawings
-
45
Figure 1 is a tep Plan‘ View Of a Sewing mechine constructed in accordance with my invention,
Figure 2 is a left hand elevation thereof, the
base being Omitted,
My invention is adapted especially for joining 45
a hem A toia, body fabric or base layer B by a
line of blind stitches, as shown in Figure 13. The
inner edge of the 'hem is indicated at a, and the
hem may have an inturned edge portion a’ if
50
Figure 3 is a perspective view of the looper sup- '
porting bracket,
desired. A needle thread C and a looper thread 60
D are employed to form a line of Grover and
Figure 4 is a perspective view of the looper
guide,
Baker stitches, which are otherwise known as
“double-lock” and “double-chain” stitches. The
Figure 5 is a partial rear end elevation, partly stitches include needle thread loops 0 which are
55 in section, showing the driving connections be- ‘ spaced equidistantly apart and pass downwardly 55
2
2,182,791
through the hem at points 0’, the connecting por
tions of the thread between the loops being ar-—
ranged in a straight line and in parallelism to the
inner edge a of the hem. Certain of these
needle loops enter and emerge from the upper
face of the body fabric as indicated at c2 to there
by form “anchor” stitches E which function to
join the hem with the body fabric, while other
needle loops miss the body fabric entirely to
10 thereby form resultant “skip” stitches F. The
are shown in Figures 7 and 8 and are as follows:
Fixed to the main shaft I! is a driving eccen
trio 24 and surrounding this eccentric is an ec
centric sleeve 25 which is positively rotated on
the eccentric but at one-half the speed thereof.
A disc 26 is loosely mounted on the main shaft
II and is provided with a radial slot 2? for re
ceiving a slide block 28 fixed to the eccentric
sleeve 25 by a shank 29. A driving gear 34 is
enchained loops d of the looper thread which are . ?xed to the main shaft ii, and rotatable on a
concatenated with the needle loops 0, are all stationary shaft 32 mounted in the frame stand
located between the hem and the body fabric and ard 6 is'a reduction gear unit including a large
are consequently concealed from view by the gear 33 and a small gear 35, the former being
hem. It will be understood, however, that all in constant mesh with the driving gear 34 and
“anchor” stitches, or alternate “anchor” and the latter being in constant mesh with a. gear 15
31 ?xed to the disc 2%. This reduction gear cou
“skip” stitches, or any combination thereof, may pling
is similar to that shown in the Mueller
be employed.
,
The machine of my invention includes a base Patent 1,989,602, of Jan. 29, 1935. The gear cou
pling ratio is such that the eccentric sleeve 25
ill) 5 having a standard 6 projecting upwardly from
is rotated once during every two revolutions of 20
the rear right hand corner thereof, an arm 7
which extends laterally from the upper end of the main shaft l l. In order to rock the disc shaft
2| from the eccentric
and eccentric sleeve 25,
said standard, and an arm 8 which extends for
I have provided a link 36 having one end ?tting
wardly from the left hand end of the arm 7.
around the eccentric sleeve 25 and the other end
Fixed to the free end of the arm 8 in the usual
manner is a horizontal presser foot 9 having a
centrally located and longitudinally extending
opening it? formed therein.
Journaled in the
laterally extending arm 7 is a main shaft H and
30 journaled in the arm 8 is an oscillatory needle
shaft i2 which is driven from the main shaft by
a connection indicated generally at E3. The nee
dle shaft i2 is disposed directly above the open
ing ill in the foot, and ?xed to the outer end of
85 the shaft is a needle arm ll!- carrying a curved
needle l5. Thus when the needle shaft i2 is
oscillated the needle l5 will reciprocate trans
versely across the opening it in the presser foot.
It will be noted at this time that the penetrating
40 stroke of the needle l5, as viewed from the front
of the machine, is from right to left.
Rigid with the base 5 is a post l6 which is
located in a plane in advance of the standard
6 and pivotally supported on the upper end of
45 this post is a work support i7 having a lateral
extension l8 which projects under the presser
foot 9, the work support I‘! being yieldably held
against depression by a spring (not shown). The
upward movement of the work support is adjust
50 ably limited by a stop l9 mounted on the work
support ii and cooperating with the machine
frame as shown in the Mueller Patent 2,018,186,
Oct. 22, 1935.
As previously stated this machine is particu
55 larly intended for hemming operations and to
pivotally connected to a rock arm 37! which is
25
clamped to the disc shaft 2 i . Thus by these con
nections the high and low portions 22, ‘23 of the
disc will successively register with the needle.
A vertically yieldable work clamp 38 is mounted
on the lateral extension 58 of the work support
I’! and cooperates with the lower face of the
presser foo-t 9 in the usual manner to clamp the
fabric against the thrust of the needle.
A top feeding mechanism for feeding the ma
terial rearwardly up to and past the needle in
cludes a ll-motion feed dog 39 having a front 35
feed section 4i} and a rearwardly spaced feed
section iii, said sections being connected by a
longitudinally extending bridge 42 forming a re
sultant opening at thereunder. This feed dog
39 is attached to a feed bar 411 by screws 45. The 40
feed sections operate in the opening iii of the
presser foot and against the upwardly spring
pressed work clamp 38, the front section 43 being
located in front of the needle path and the rear
section 45 in rear of said path. The feed bar 45 45
is raised and lowered by a train of mechanism
from the main shaft ll, and is moved back and
forth by a train of mechanism operated from
said main shaft. A bell crank lever 48 is pivoted
at its angle as at 41 to the forwardly extending 50
arm 8 of the frame. This bell crank lever in
cludes a forwardly extending arm 138 and a down
wardly extending arm 49. A link 56 is pivotally
this end means are provided for projecting a
connected at its upper end as at 5! to the arm
ridge of material upwardly through the presser
foot opening lil into needle penetrating position
44‘.
during each cycle. A disc 2b is fixed to the end
60 of a rock shaft 2i which is journaled in bearings
on the under side of the work support H. The
disc is provided with high and low peripheral
portions 22 and 23 respectively, arranged in tan
dem, and this shaft 2i is oscillated for dilferent
65 angular amounts by driving connections with
the main shaft l l whereby the high and low por
tions of the disc will register successively with
the needle during the penetrating strokes there
of. Thus at the rear end of one oscillation stroke
7.0 the needle will engage both the hem A and the
body fabric B to form a resultant “anchor” stitch
E and at the rear end of the next stroke the
needle will engage the hem A only to form a re
sultant “skip” stitch F. The driving connections
75 between, the main shaft H and the disc shaft 2i
30
48 and at its lower end‘as at 52 to the feed bar 55
The rear end of the feed bar is provided with .
an inclined open ended slot 53 which has sliding
connection on a bearing pin 5% ?xed to the for
wardly extending frame arm 8. A pitman 55 is
pivotally connected at its forward end as at 56 60
to the depending arm 49 of the bell crank lever
46 and the rear end of this pitman is connected
with an eccentric 5T ?xed on the main shaft II.
It will thus be seen that upon rotation of the 65
main shaft, the eccentric 51 will rock the bell
crank lever 46 which, through the medium of
the link 5|, will raise and lower the feed bar 44.
In order to move the feed bar back and forth,
I have provided a slotted segment 58 which is
70
pivoted at its upper end as at 59 to the forwardly
extending frame arm 8. A driving link 60 is
pivotally connected at its forward end as at 6|
to the feed bar 134 and the rear end of this link
is adjustably connected to the slotted segment
75
3
2,132,791
58 by a clamping bolt 62, the slot. of the segment
being arcuate and having for its center the pivot
9 I. The slotted segment 58 is pivotally connected
as at 63 to a sleeve, 64 which surrounds an eccen
tric 65 ?xed on the main shaft II. Thus. upon.
rotation of the main shaft II, the eccentric55
will impart swinging movements to the slotted
segment 58 and this segment through themee
dium‘ of the link60 will impart back and forth
movements to the feed bar 44. By adjusting the
clamping bolt 62 lengthwise of the slotted seg»
ment 58 the length of feed travel imparted to
the feed dog 39 may be readily varied.
'
Cooperating with the needle is a looper 68’
which is threaded with the looper thread D. This
looper is ?xed to the forward end of a looper
bar 87 extending longitudinally of the frame arm,
9 and alongside of the feeding mechanism. This
looper bar is slidably mounted for longitudinal
20 movements in spaced bearings 68, 69 mounted on
a bracket 19 which is attached by screws ‘II to
the frame arm 8. The looper 86 has a non-avoid
ing movement with respect to the needle l5 and
reciprocates in the line of feed and along a sin»
25 gle straight horizontal line which passes above
the needle. This looper is disposed on that side
of the disc 29 opposite the point of needle pene
tration.
The looper therefore travels not only
above the needle I5 but also above the presser,
30 foot 9 and its path of movement is in the line
of feed or at right angles to the plane of needle
reciprocations. In order to reciprocate the looper
longitudinally from the main shaft I l, I have
provided the looper bar 61 with a depending
clamping arm 12, the upper end of the arm being
formed into a split clamp 13 which surrounds
the looper bar 81 and is clamped thereto by a
screw 14. A pitman 15 has its forward end piv
otally connected as at 16 to the lower end of the
clamping arm 12 and its rear end engaged with
40
an eccentric pin TI ?xed to a sleeve 18 secured
on the main shaft II. The looper bar 61 is re
tained against axial rotation by means of a guide
shoe l9 which is preferably formed integral with
45
the clamping arm 12 and cooperates with an up—
wardly extending guide plate. 80 attached to the
bracket 19 by screws 8|. It will be noted that
the looper bar 51 is in the same horizontal plane
as the main shaft I I and that the pivotal connece
tion ‘I9 is located below said plane. Consequent
ly a variable speed travel is imparted to the looper
during its backward and forward movements
whereby the looper during the ?rst part of its
forward stroke will have a relatively fast speed
travel while entering the needle thread loop, and
‘whereby the looper will have a relatively slow
Anedge guide 83 is attached to the front end
of the presser foot 9 and includes a vertical guide
portion which projects downwardly into the press
erv foot opening I0 and at the left side of the front
feed section 40.
.
A spring plate 84 is mounted on the presser foot
9 at the forward end thereof and at the right
hand side of the opening l9, and includes a lat
erally extending arm 85 which overhangs the disc
29. This arm 85 is disposed in front of the path
of the needle I5 and under the bridge 42 of the
feed dog, and the free end of said arm is formed
with a forwardly extending recess 88 and a rear
wardly extending ?nger 81. The slot 86 receives
the edge a of ‘the hem A, the arm 85 is pressed
downwardly against the hem which is over the
disc 28, and the ?nger 81 supports the edge a of
the hem against the penetrating thrust of the
needle I5. ,
The needle thread C is led forwardly through a
tension 88 mounted on a bracket 89 attached to
the rear end of the frame arm 8, thence through
a thread guide 98 carried by a tension or control
spring 9! mounted on an upstanding bracket 92
attached to the front end of the frame arm 8, and
thence through a thread guide 93 formed in the
top of the bracket 92. A forwardly extending
bracket arm 9ft is attached by a screw 95 to the
forward end of the frame arm 8, and carries a
stationary thread guide 98 located above the path
of needle travel and in alinement with the needle
shaft I2. The needle thread passes from the guide
99, thence through the guide 93, thence through
the guide 95, thence through a thread guide 91
attached to the lower end of the needle arm I4,
and then to the needle eye.
,
Thus it will be seen that the location of the
stationary needle thread guide 96 coupled with
the control spring 9i and the associated thread
guide
the needle thread will be held taut and
will remain in the long groove of the needle which
is formed in the underside thereof as usual. Con
sequently the thread will not become abraded
which would occur if the thread were caused to
move intermittently in and out of said groove.
The looper thread D is led forwardly through a
tension 98 mounted on the bracket 89, thence
through a guide 99 mounted on the forward end
of the bracket arm 94 and located in advance of
the path of needle travel, thence downwardly and
rearwardly to a. guide l 98 located on the forward
end of the looper shaft 61 and adjacent the rear
end of the looper 66, and thence to the‘ looper
eye iEiI.
speed travel during the ?rst part of the backward
Thus it will be noted that because of the posi—
tion of the thread guide 99, the looper thread
will be inclined between said guide 99 and the
stroke thereof while the needle is‘ entering the
looper thread loop. In Figure 6, I have dis
that as the looper moves forwardly the looper
closed a diagram showing the variable looper
travel.
'
The needle I5 is provided along its forward
side with a shallow groove or spreader 82 which
functions to drag the looper thread loop which
‘is around the needle, toward the right and out of
the path of the looper whereby the looper will
with certainty enter the needle thread loop with
out engaging said looper thread loop.
thread guide I99 at the rear end of the looper; '
thread feeds through the guide I09; that the
length of the looper thread between these guides
99 and I99 becomes reduced in proportion to the
amount of the forward travel of the looper; that
the difference in the length of the thread between
the guide 99 and I99 when the looper is at the 656
forward end of its travel and when the looper is»
at the rear end of its stroke equals the amount of
thread employed in forming the shortest stitch;
The needle I5 has its path of movement across 7 that when the length of the stitch is increased;
‘the line of feed and under the bridge 42 of the a corresponding amount of thread is pulled from 70'
70 I.
“‘feed dog. Consequently the front feed portion 49 the supply during the last part of the forward
functions to feed the material up to the needle movement of the looper; and that by reason of
and the rear portion 4| of the feed dog functions the location of the guide 99 the thread will re
to feed the material rearwardly away from the main in the groove of the looper during the back
75. needle.
Ward movement thereof.
2,132,791
It is. of course to be understood'that the de
tails of structure and arrangement of parts may
be variously changed and modi?ed without de
parting from the spirit and scope of my inven
tion.
I claim:
1. In a sewing machine stitch forming mecha
nism, the combination with a feeding mechanism,
of a threaded needle mounted for reciprocations
10 across the line of feed, and a threaded looper
mounted for reciprocations in a single straight
line in the line of feed for cooperation with the
needle, the looper passing above the needle in
both strokes of each reciprocation.
15
2. In a sewing machine stitch forming mecha
nism, the combination with a feeding mechanism,
of a threaded needle mounted for reciprocations
across the line of feed and provided with a spread
er groove, and a threaded looper mounted for re
20 ciprocations in a single straight line in the line
of feed for cooperation with the needle, the nee~
dle-loop penetrating movement of the looper be
ing in a direction opposite the direction of feed
and the looper passing above the needle in both
25 strokes of each reciprocation.
3. In a sewing machine stitch forming mecha
nism, the combination with a feeding mechanism,
of a threaded needle mounted for reciprocations
across the line of feed, a threaded looper mounted
30 for straight line reciprocations in the line of feed
for cooperation with the needle, and means for
reciprocating said looper including devices for
imparting a relatively slow movement to the loop
er during the ?rst part of the return travel
35 .
thereof.
the needle-loop penetrating movement of the
looper being in a direction opposite the direction
of feed, and means for reciprocating said looper
including devices for imparting a relatively fast
movement to the looper during the ?rst part of 5
the forward travel thereof and a relatively slow
movement to the looper during the ?rst part of
the return travel thereof.
8. In a sewing machine stitch forming mecha
nism, the combination with a feeding mechanism, ll)
of a threaded needle mounted for reciprocations
across the line of feed, and a threaded looper
mounted for reciprocations in the line of feed
for cooperation with the needle and having its
needle-loop penetrating movement in a direction
opposite the direction of feed, said needle being
provided with a transverse seat for receiving the
looper thread loop during the return stroke of
the needle to thereby move said loop laterally
out of the path of the forwardly moving looper.
9. In a sewing machine stitch forming mecha
nism, the combination with a feeding mechanism,
of a threaded needle mounted for reciprocations
across the line of feed, and a threaded looper
mounted for straight line reciprocations in the 25
line of feed for cooperation with the needle and
having its needle-loop penetrating movement in
a direction opposite the direction of feed, said
needle being provided with a transverse seat for
receiving the looper thread loop during the re 30
turn stroke of the needle to thereby move said
loop laterally out of the path of the forwardly
moving looper.
10. In a sewing machine stitch forming mech
anism, the combination with a feeding mecha
nism, of a threaded needle mounted for recipro
35
4. In a sewing machine stitch forming mecha
nism, the combination with a feeding mechanism, ' cations across the line of feed, and a threaded
of a threaded needle mounted for reciprocations looper mounted for reciprocations in the line of
across the line of feed, a threaded looper mount
feed for cooperation with the needle and having
40 ed for straight line reciprocations in the line of its needle-loop penetrating movement in a di
feed for cooperation with the needle, the needle
rection opposite the direction of feed, said nee
loop penetrating movement of the looper being in dle being provided with a transverse seat for re
a direction opposite the direction of feed, and ceiving the looper thread loop during the re
means for reciprocating said looper including de
turn stroke of the needle to thereby'move said
45 vices for imparting a relatively slow movement
loop laterally out of’ the path of the forwardly 45
to the looper during the ?rst part of the return moving looper, and means for reciprocating said
travel thereof.
looper including devices for imparting a rela
5. In a sewing machine stitch forming mecha
tively fast movement to the looper during the
nism, the combination with a feeding mechanism, ?rst part of the forward travel thereof.
50 of a threaded needle mounted for reciprocations
11. In a sewing machine stitch forming mech
across the line of feed, a threaded looper mount
anism, the combination with a feeding mech 50
ed for straight line reciprocations in the line of anism, of a threaded needle mounted for recip
feed for cooperation with the needle, and means rooations across the line of feed, a ridge forming
for reciprocating said looper including devices element for presenting a ridge of material to the
55 for imparting a relatively fast movement to the
needle, a threaded looper cooperating with the
looper during the ?rst part of the forward travel needle and mounted for horizontal straight line 55
thereof.
reciprocations in the line of feed and on that
6. In a sewing machine stitch forming mecha
side of’ the ridge forming element opposite the
nism, the combination with a feeding mecha
point of needle penetration, the needle-loop pen
60 nism, of a threaded needle mounted for recipro
etrating movement of the looper being in a di
cations across the line of feed, a threaded looper rection opposite the direction of feed, said needle 60
mounted for straight line reciprocations in the being provided with a transverse seat for receiv
line of feed for cooperation with the needle, and ing the looper thread loop during the return
means for reciprocating said looper including stroke of the needle to thereby move said loop
65 devices for imparting a relatively fast movement
laterally out of the path of the forwardly mov
to the looper during the ?rst part of the forward ing looper.
travel thereof and a relatively slow movement to
12. In a sewing machine, the combination with
the looper during the ?rst part of the return a frame including a forwardly extending arm,
travel thereof.
of a horizontal presser foot ?xed to the front
70
'7. In a sewing machine stitch forming mecha
end of said arm and having an opening, a main 70
nism, the combination with a feeding mecha
shaft journaled in the rear end of said arm, a
nism, of a threaded needle mounted for recip
needle shaft extending longitudinally of and
rocations across the line of feed, a threaded loop
journaled in said arm, a needle mounted on said
er mounted for straight line reciprocations in needle shaft for reciprocations above the foot
the line of feed for cooperation with the needle, and across the opening therein, driving connec
75
72,132,791
stitching head, and a looper thread guide mount
"tions between the main shaft and the needle ed
‘on said head between the ‘tension and the
shaft, a looper bar mounted on the frame arm
looper
and located ‘in front of vthe needle and
‘between the ‘main shaft and the needle for hori
substantial 'alinement with the looper.
zontal straight line movements longitudinally in 16.
In a blind stitch sewing machine, the com
‘of the arm, means for lretaining'thev looper bar bination
with 1a stationary presser foot having
‘against 'axial rotation, a threaded looper ?xed an opening,- of a feeding mechanism, means for
td'the forward end of the bar for cooperation
with “the‘needle, and driving connections between
- ‘the main shaft and the looper bar.
(‘13. ‘In a sewing machine, the combination with
ll)
a frame including a forwardly extending arm,
‘ -of;'a horizontal presser foot ?xed to the front
‘ end of said arm and having an opening, a main
‘shaft journaled in thekrear end of said arm, a
“needle shaft extending longitudinally ‘of and
‘projecting a ridge ‘of material upwardly through
the opening into needle penetrating position, and
a‘ stitch forming mechanism operating entirely 11')
above the foot‘including a threaded needle hav
ing reciprocatory movements across said opening
and in a plane transverse to ;the'1ine of feed, and
a cooperating threaded‘ looper having recipro~
catory movements in a single straight line in the
4
,journaled 3in' said arm, a needle mounted on said
iinee'dle" shaft‘ for reciprocatiohs above the foot
‘and ‘across theopening therein, vdriving connec
tions between ‘the main shaft and the needle
shaft,_ a looper bar mounted on the frame arm
between ‘the main shaft and the needle for hori
zontal straight line movements longitudinally of
line
of ‘feed,
'
,
>
,
'
‘
1'7. In a blind, stitch sewing machine, ‘the com
bination with a-stationary presser foot having
an opening, of a feeding mechanism, means for
projecting a ridge "of material upwardly through
the opening into needle penetrating position, and
a stitch forming mechanism operating entirely
20
above the foot including a threaded needle hav
the arm and in substantially the same horizontal
plane as the main shaft, means for retaining
ing reciprocatory movements across said opening
the looper bar against axial rotation, a threaded
looper ?xed to the forward end of the bar for
cooperation with the needle, and driving con
nections between the main shaft and the looper
a cooperating threaded looper having recipro
and in a plane transverse to the line of feed, and 25
catory movements in a single straight line in
the line of feed, the needle penetrating move
bar comprising a downwardly extending arm ment of the looper being in a direction opposite
?xed to the looper bar, a driving eccentric ?xed the direction of feed.
18. In a blind stitch sewing machine, the com
to the main shaft, and a pitman connected at one
bination with a stationary presser foot having
end to the eccentric and at its other end to the
an opening, of a feeding mechanism, means for
downwardly exending arm at a point below_ projecting
a ridge of material upwardly through
the looper bar.
35
14. In a sewing machine, the combination with the opening into needle penetrating position, and
a frame including a forwardly extending arm, a stitch forming mechanism operating entirely
above the foot including a threaded needle hav
of a horizontal presser foot ?xed to the front ing reciprocatory movements across said opening
end of said arm and having an opening, a main
and in a plane transverse to- the line of feed, a
shaft journaled in the rear end of said arm, a cooperating threaded looper having reciprocatory 40
40
needle shaft extending longitudinally of and
journaled in said arm, a needle mounted on said
needle shaft for reciprocations above the foot
and across the opening therein, driving connec
tions between the main shaft and the needle
45
shaft, a looper bar mounted on the frame arm
between the main shaft and the needle for hori
zontal straight linemovements longitudinally of
50
the arm, means for retaining the'looper bar
against axial rotation, a threaded looper ?xed
to the forward end of the bar for cooperation
with the needle, driving connections between
the main shaft and the looper bar, and a 1i
motion top feed mechanism for feeding the fab
ric up to and past the needle comprising a feed
dog having spaced sections respectively disposed
in front of and in rear of the needle path of
travel and at one side of the looper travel, a
7 feed bar extending longitudinally of the work
arm, connections between the main shaft and
(30 the feed bar for imparting up and down move
ments to the feed bar, and other connections
between the main shaft and the feed bar for
imparting back and forth movements to said
feed bar.
(55
~!
-
- 15. In a looper thread control for sewing ma
chines, the combination with a stitching head,
of a stationary presser foot mounted on said
head and provided with a longitudinal opening,
a threaded needle mounted on said head for
reciprocations above the foot and across the
opening thereof, a threaded looper mounted on
said head for cooperation with said needle and
having its needle-loop entering and shedding
movements across the path of needle movement,
-1
a tension for the looper thread mounted on the
movements in a single straight line ‘in the line
of feed, and means for reciprocating said looper
including devices for imparting a relatively slow
movement to the looper during the ?rst part of
the return travel thereof.
.
19. In a blind stitch sewing machine, the com
bination with a stationary presser’ foot having
an opening, of a feeding mechanism, means for
projecting a ridge of material upwardly through
the opening into needle penetrating position, and 50
a stitch'forming mechanism operating entirely
above the foot including a threaded needle hav
ing reciprocatory movements across said opening
and in a plane transverse to the line of feed, a
cooperating threaded looper having reciprocatory
movements in a single straight line in the line
of feed, the needle penetrating movement of the
looper being in a direction opposite the direction
of feed, and means for reciprocating said looper
including devices for imparting a relatively slow 60
movement to- the looper during the ?rst part of
the return travel thereof.
20. In a blind stitch sewing machine, the com
bination with a stationary presser foot having
an opening, of a feeding mechanism, means for 65
projecting a ridge of material upwardly through
the opening, into needle penetrating position, and
a stitch forming mechanism operating entirely
above the foot including a threaded needle hav
ing reciprocatory movements across said opening 70
and in a plane transverse to the line of feed,
and a cooperating threaded looper having recip
rocatory movements in a single straight line in
the line of feed, said needle being provided with
a transverse seat for receiving the looper thread 75
6
2,132,791
loop during the return stroke of the needle to
thereby move said loop laterally out of the path
of the forwardly moving looper.
21. In a blind stitch sewing machine, the com
bination with a stationary presser foot having
an opening, of a vfeeding mechanism, means for
projecting a ridge of material upwardly through
the opening into needle penetrating position, and
a stitch forming mechanism operating entirely
above the foot including .a threaded needle hav
ing reciprocatory movements across said opening
and in a plane transverse to the line of feed,
and a cooperating threaded looper having recip
22. In a blind stitch sewing machine, the com
bination with a stationary presser foot having
an opening, of a feeding mechanism, means for
projecting a ridge of material upwardly through
the opening into needle penetrating position, and
a stitch forming mechanism operating entirely
above the foot including a threaded needle hav
ing reciprocatory movements across said opening
and in a plane transverse to the line of feed, a
cooperating threaded looper having reciprocatory
movements in a single straight line in the line
of feed, and means for reciprocating said looper
including devices for imparting a relatively slow
movement to the looper during the ?rst part of
the return travel thereof, said needle being pro 15
ment of the looper being in a direction opposite '
vided with a transverse seat for receiving the
the direction of feed, ‘said needle being provided loo-per thread loop during the return stroke of
with a transverse seat for receiving the looper the needle to thereby move said loop laterally out
thread loop during the return stroke of the nee
of the path of the forwardly moving looper.
20 dle to thereby move said loop laterally out of
the path of the forwardly moving looper,
RALPH SIIVLPSON KELSO.
rocatory movements in a single straight line in
the line of feed, the needle penetrating move_
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