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Патент USA US2064881

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Dec. 22, 1936.
I
|__ G_ BOWMAN
.
2,064,881
AUTOMATIC TENSION RELEASE FOR BLIND STITCH SEWING MACHINES
Original Filled Sept. 27, 1935
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Dec. 22, 1936.
.__ G, BOWMAN‘
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2,064,881
AUTOMATIC TENSION RELEASE FOR ‘BLIND STITCH SEWING MACHINES
Original Filed sept. 27, 1935
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Dec. 22, 1936.
|_. G. BOWMAN
2,064,881
AUTOMATIC TENSION RELEASE FOR BLIND STITCH SEWING MACHINES
Original Filed Sept. 27, 1955
3 Sheets-Sheet 3
Laws 6. 50w/‘1AN
Patented Dec. 22, 1936
2,054,881
UNITED sraras
PATENT ®FFi€E
2,064,881
AUTOMATIC TENSION RELEASE FOR BLIND
STITCH SEWING MACHINES
Louis G. Bowman, St. Louis, Mo., assignor to
Lewis Invisible Stitch Machine Company, St.
Louis, Mo., a corporation of Maine
Original application September 27, 1935, Serial
No. 42,547. Divided and this application April
14, 1936, Serial No. 74,378
(Cl. 112—254)
mally held against depression or downward swing
This invention relates to new and useful im
7 Claims.
provements in sewing machines generally, al
though more particularly to improvements in
means for releasing the needle thread tension em
ployed in sewing machines of the blind stitch
type.
This application constitutes a division of my
copending application Serial No. 42,547, ?led Sept.
27, 1935, for Improvements in sewing machines.
10
The principal object of the invention is to
provide a tension release for the needle thread
port will then be depressed to facilitate the inser
which is automatically operable upon depression
of the pivoted work support whereby the stitched
tion or removal of the material.
fabric may be readily withdrawn from the ma
chine.
With the above and other objects in view which
will more fully appear, the nature of the inven
tion will be more clearly understood by following
the description, the appended claims, and the
20 several views illustrated in the accompanying
drawings:
.
In the drawings:
Figure 1 is a front elevation of a blind stitch
sewing machine embodying my invention,
Figure 2 is a top plan View thereof,
25
Figure 3 is a detail vertical section showing
the means for pivotally mounting the work sup
port, and
Figure 4 is a somewhat diagrammatic sectional
view illustrating the automatic releasing of the
needle thread tension by depression of the work
support.
Like reference numerals designate correspond
ing parts throughout the several ?gures of the
35
ing movement by a spring Hill together with a
locking mechanism indicated as a whole by the
reference letter X. A trip lever I45 is mounted
on the work support for releasing the locking
means, and a chain I47 which is connected to
the trip lever is adapted to be connected to a
treadle or knee-press whereby upon operation of
said treadle or knee-press the trip lever I45 will
?rst release the locking means and the work sup 10
drawings.
My invention is shown as applied to a. blind
stitch sewing machine which embodies a main
frame including a base 5, a standard 6 having an
arm I extending laterally from the upper end
thereof, and a forwardly extending stitching head
8 secured to the free end of said arm. A hori
zontal presser foot 20 is rigidly secured to the
stitching head, and mounted for reciprocatory
movements on the head above the foot is a needle
45 24 which cooperates with a complemental stitch
forming mechanism also mounted on said head.
A work support d! having a portion located below
the foot is pivoted to the standard as at 42 to
swing downwardly and forwardly, and is pro
50 vided with an upstanding guard wall or ?ange
44 located in front of the standard. The work
support carries a work clamp which cooperates
with the foot, and means for projecting a ridge
of fabric upwardly through the foot into needle
55 penetrating position. The work support is nor
The usual needle thread tensioning means
which is indicated at I49, is mounted on the
stitching head 8 and includes the usual opposed 15
tensioning plates or discs I50. In order to auto
matically release the thread tension whenever the
work table or support 4| is depressed, I provide
a release lever I5i which is pivoted at I52 on the
machine frame. The lever includes a crank arm
I53 which overlies the ?ange 44 of the Work sup
port and is equipped with an adjustable abut
ment screw I5lI for engaging said wall. The lever
also includes a release arm I 55 which projects into
position for engaging between the tension plates
I58. A coil spring I55 encircles the lever and has
its end extended for engagement with the frame
release arm I55 for holding the abutment screw
I54 in engagement with the flange M. Each time
the work support is depressed as shown in dotted 30
lines in Figure 4 of the drawings, the release arm
I55 will effect a separation of the tension plates
I50 and permit the operator to readily withdraw
the stitched work from the machine.
It is of course to be understood that the de 35
tails of structure and arrangement of parts may
be variously changed and modi?ed without de
parting from the spirit and scope of my invention.
I claim:
1. In a blind stitch sewing machine, the com 40
bination with a frame, of a horizontal presser foot
rigidly secured to said frame, a stitch forming
mechanism located above the presser foot and in
cluding a reciprocating threaded needle, a work
support mounted on the frame to move down
45
wardly and having a portion disposed under the
foot, needle thread tensioning means mounted
on the frame, and means automatically actuated
upon depression of the work support for re
leasing said thread tensioning means.
50
2. In a blind stitch sewing machine, the com
bination with a frame, of a horizontal presser
foot rigidly secured to said frame, a stitch form
ing mechanism located above the presser foot and
including a reciprocating threaded needle, 3, 55
2.
2,064,881
work support mounted on the frame to move
downwardly and having a portion disposed under
the foot, needle thread tensioning means mount
ed on the frame and including a pair of spring
pressed tensioning discs, and means automatical
ly actuated upon depression of the work support
for separating said tensioning discs.
3. In a blind stitch sewing machine, the com
bination with a frame, of a horizontal presser
10 foot rigidly secured to said frame, a stitch form
ing mechanism located above the presser foot
and’including a reciprocating threaded needle, a
work support pivoted on the frame to swing
downwardly and having a portion disposed under
15 the foot, needle thread tensioning means mount
ed on the frame and including a pair of spring
pressed tensioning discs, and means automati
cally actuated upon depression of the work sup
port for releasing said thread tensioning means,
said tension release means comprising a release
member having a body portion pivotally support
ed on the frame and crank end portions one of
which is disposed in cooperative relation with
the work support and the other of which pro
25 jects between the tension discs.
4. In a blind stitch sewing machine, the com
bination with a frame including a standard, an
arm extending laterally from the upper end
thereof, and a stitching head attached to the free
end of said arm, of a horizontal presser foot
?xed to said stitching head, a reciprocatory
threaded needle mounted on the head abovethe
foot, a work support pivoted on the standard to
swing downwardly and having a portion disposed
under the foot, means carried by the work sup~
port for projecting a ridge of material upwardly
into needle penetrating position, a tensioning
means for the needle thread supported on the
frame, and means including a lever mounted on
40 the laterally extending frame arm and automati
cally actuated upon depression of the work sup
port to release said tensioning means.
,
5. In a blind stitch sewing machine, the com
bination with a frame including a standard, an
arm extending laterally from the upper end there
of, and a stitching head attached to the free
end of said arm, of a horizontal presser foot
?xed to said stitching head, a reciprocatory
threaded needle mounted on the head above the
foot, a work support pivoted on the standard to
swing downwardly and having a portion disposed
under the foot, and also an upwardly extending
?ange, means carried by the work support for
projecting a ridge of material upwardly into
needle penetrating position, a tensioning means
for the needle thread supported on the frame,
and means including a lever mounted on the lat
erally extending frame arm and automatically
actuated upon depression of the work support
to release said tensioning means, the end of the
lever opposite the tensioning means being dis
posed in front of and engageable by the work 10
support ?ange when said work support is de
pressed.
6. In a blind stitch sewing machine, the com
bination with a frame including a standard, an
arm extending laterally from the upper end 15
thereof, and a stitching head attached to the free
end of said arm, of a horizontal presser foot
?xed to said stitching head, a reciprocatory
threaded needle mounted on the head above the
foot, a work support pivoted on the standard to 20
swing downwardly and having a portion disposed
under the foot, and also an upwardly extending
?ange, means carried. by the work support for
projecting a ridge of material upwardly into
needle penetrating position, a tensioning means
for the needle thread supported on the frame,
and means including a lever mounted on the lat
erally extending frame arm and automatically
actuated upon depression of the work support to
release said tensioning means, the end of the 30
lever opposite the tensioning means being dis
posed in front of and engageable by the work
support ?ange when said work support is de
pressed, and an adjusting screw carried by said
end of the lever for engagement with said ?ange. 35
7. In a blind stitch sewing machine, the com
bination with a frame, of a horizontal presser
foot rigidly secured to the frame, a stitch form
ing mechanism located wholly above the foot and
including a reciprocatory needle, needle thread 40
tensioning means mounted on the frame, a ridge '
forming element located below the foot for pro
jecting a ridge of material upwardlypthrough the
foot into needle penetrating position, a support
for the ridge forming element ,mounted on the 45
frame for movements towards and from the
presser foot, means for yieldably urging the sup
port towards the foot, and means automatically
actuated upon depressionpof the support for re
leasing said needle thread tensioning means.
LOUIS G. BOWMAN.
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