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‘Sept- 24', 1946-
»
c. w. JO'HNSON _
‘
2,407,986‘
STITCH LENGTH ADJUSTING MECHANISM
Original Filed Aug. 12, 1939
2 Sheeis-Sheet 1
CARL VVV. JOHNSON
ATTORNEY.
Sept. ‘24, 19-46. '
‘
I
I _“
JOH-NSON'
2,407,986
STITCH LENGTH'ADJUSTING MECHWISM
Original Filed Aug. 12, i939
‘
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INVENTOR
'
CARL W. JOHNSON
BY
ATTORNEY
Patented Sept. 24, 1946
2,407,986
UNITED STATES PATENT OFFlCE
2,407,986
STITCH LENGTH ADJUSTING MECHANISM
Carl W. Johnson, Brooklyn, N. Y., assignor to
American Machine and Foundry Company, a
corporation of New Jersey
‘Original application August 12, 1939, Serial No.
289,907. Divided and this application August
11, 1942, Serial No. 454,353
4 Claims.
(01. 112—-210)
1
2
This invention relates to sewing machines, and
the present application is a divisional application
from the earlier application, Serial No. 289,907,
?led August 12, 1939, for Sewing machine and
Figure 1 is a partial front elevation of the sew
ing machine embodying my improved stitch
length controlling mechanism;
_
.
t
Figure 2 is a detail View taken on line 2—2
relates to improvements in mechanism for con
of Figure 1 showing one form of the feeding.
trolling the length of stitches to be formed dur
mechanism and means for adjusting the feed
ing the operation of the machine.
to lengthen or shorten the stitches;
.
,
The invention relates further to sewing ma
Figure 3 is a side elevation of a modi?ed de
chines, especially of the under and over stitch
vice for adjusting the length of stitch; . t
type, utilizing a double pointed needle having 10
Figure 3a is an end‘view of ‘a detail of the
an eye located between the points, and has par
mechanism shown in Figure ,3 ;
.
‘
ticular reference to mechanism for controlling
Figure 4 is a side elevation of another modi
the length of stitches formed by the movement
?cation for adjusting the length of the stitch
of this type of needle and a thread through
in which it is possible to produce alternate short’
work being sewed.
‘
15 and long stitches automatically;
In order to meet all of the demands which may
Figure 5 is an end view of Figure 4;
be imposed upon my machine in sewing all of the
Figure 6 is a sectional partial side elevation of a
various kinds of materials which may be han
detail of the work feeding mechanism taken on
dled thereon, it may be necessary from time to
line 5-6 of Figure l; and
v
.
time or during the sewing of any particular work 20
Figure 7 is a plan view of a detail of the stitch
or material to change the length of the stitch
length adjusting mechanism shown in Figure. 3.
from long to short or vice versa, or to utilize a
Referring to the drawings, Figure 1 shows a
certain length stitch for one part and another
preferred embodiment of my invention adapted
length stitch for another, etc. For that reason
for use in a machine of the type employing a
my invention further consists in the provision of 25 double pointed needle N having an eye between
improved mechanism which makes it possible to
the points and needle bars 55, 56 provided with
change the length of the stitch from time to
tapered caps 12 serving to con?ne spring pressed
time whenever necessary. This mechanism may
jaws (not shown), which may be of the type
operate automatically or be adjusted manually
shown in Naftali Reissue Patent No. 19,653,
to change the length of the stitch whenever. de ps0 granted July 23, 1935, which clutch the needle
sired.
‘
N, to perform the stitching. As shown, the ma
It is a further object of my invention to pro
chine comprises a stationary frame I ll, a.sew-.
vide improved mechanism for use with a machine
employing a double pointed needle in which
ing machine head ll extending therefrom and a
bracket I 2 supporting the work table 113. Hand
changes in stitch length are made automatically 35 wheel 4| is driven in the manner described in my
during the operation of the machine.
.co-pending application to operate the needle
It is also an object of ‘my invention to provide
bars and associated mechanism from a suitable
mechanism which automatically changes alter
motor and clutch (not shown) by means of a
nate stitch lengths during the operation. of the
pulley 24, driven by means of a belt 23 running’
machine.
_
It is also an object of my invention to provide
a‘ sewing machine of the type forming over and
under stitches of a predetermined length, and
selective means ‘for changing from one length
40 on a pulley 22 carried by shaft 36 which mounts‘
a pulley I9 over which runs a motor driven belt
l8.
'
It will be understood by those skilled‘in the
art, that in this type of machine, needle N is
45 projected back and forth through the work and
to another either manually orrautomatically.
With these and other objects'not speci?cally
is, therefore, alternately grasped by the jaws of mentioned in view, the invention consists‘ in cer
each needle bar 55, 55. Brie?y the action is
tain' combinations and constructions which will
such that as one needle bar, say 55, moves needle
be hereinafter fully described, and then spe
N downwardly into the work, the head 73 of the
ci?cally set forth in the claims hereunto ap 50 needle bar 55 will abut the upper lug 63 and
pended.
effect the release of the needle from the upper
In the accompanying drawings which form a
Part of this speci?cation,‘ and wherein the sev
needle bar, the needle bar being grasped by the
eral reference characters designate the same or
upper bar.
like elements:
-
lower needle bar 56 in the same manner as the
The upper needle bar upon receiving ‘
55 the needle from the lower needle bar 56, rises
2,407,986
3
4
and elevates head 13 from engagement with lug
63. At the moment this occurs, the spring pressed
jaws clutch the needle by reason of the spring
action in needle bar 55, and movement of the
jaws into cap 12. The operation of the lower
tion, drives the thread puller I86 in order to
needle bar 56 is effected in the. same general.
manner, and hence it will be understood that
whenever a head 13 is not in engagement with a
pull the loose end of the thread through the
work. The thread puller I86 is provided with a
pointed thread engaging end so mounted that it
may rotate around the periphery of the station
ary drum member I18. The chief function of
the. thread puller is to engage the loop of thread
formed on alternate movements of the needle
lug 63, the spring action in each needle bar will.
and pull the thread through the work, and dis
force the gripping jaws into cap ‘I2 and cause
the jaws to grip the needle. The spring action
pose it about the periphery of the drum in such
of the jaws acts alternately so that-?rst one and
then the other bar grips the needle. I
The work is fed over table I3 beneath a presser
foot ‘I5 provided to engage and retain it in sew
ing position. This foot is secured to a holder 76
clamped to the lower end of’ a- spring' tensi‘oned
rod 1'! which is guided in the lugs 63 and 64 of
member 65. The rod 11 is provided with ‘a. block
‘I8 ?tting in the space between the rear wall of
member 65 and. a. strap 79 secured to a portion
of member I55v and‘ in this manner tends to re.
tain the presser foot in alignment with the nee
dle bars. The upper end of the rod TI is pro
vided with a collar till-normally abutting a. forked
block 81- fastened to one end of a pivot shaft, 82.
One end of shaft '82‘ is mounted on a projecting.
lug 83 of member 63' and has its other end mount
ed in a lug. (not shown) secured. to the wall‘ 21
of head I.I.’.. At a point along. the length of‘ shaft 3.0
82' is mounted an actuator arm 8'6 carrying a
stud supporting a head 87, which holds one end
of. arod 88 connected to‘ a link (not shown-)1 in
a manner‘ that the. danger of snarling, fouling
or breaking the. thread is practically eliminated.
Thread, puller I85‘ is ?xed to the outer end of
a carrier arm. I81; which is pivotally mounted on
a rotating member (not shown). The outer end
of arm I8‘! is also provided with a curved guide
plate,~ {=93 adapted to engage a tape I94 partly
circling‘ the drum I18, which tape acts to main
tain the thread in orderly fashion and also pre
vents whipping of the thread as it is placed
around the drum. A brush S may be ?xed be
neath the drum I‘I‘Bi, as shown in Figure I, in
order to act as. a brake and‘ apply a frictional;
force upon the thread as itis. being pulled from.
the drum. This adds additional control‘ in han
dling the thread and prevents it from whipping.
about or tangling in any'manner.
The driven sprocket 4.2 (Figure 1)v imparts mo
tion to a chain I05 running over a sprocket. I06.
mounted on a shaft I01‘ supported in a hub of
bracket I08 secured toframe I6.. The opposite
end of shaft I0‘! supports a coupling I09 (Figure
2) terminating ina cam surface III] which im
parts up and down motion. to the material feed.
Member I 09 sup
ports a short eccentric. stud, I'I'I' equipped with
in my co-pending application,v Serial No. 289,907
a roller H2 engaging an elongated slot H3 pro
in order to raise and lower foot ‘I5. -By lifting
vided. in the lower. end‘ of lever ‘I I4 fulcrumed on
the presser foot the operator may readily inspect
arm H5 which is mounted .on the end of a, pivot.
the work or locate new work in sewing position.
When the lower needle bar 55 ascends, causing 40 stud H6 secured to frame ['0 by a bolt I'I'I, Lever
H4 mounts a stud [I8 carryingha follower I‘I‘9'
the. needle, N. to push. the thread, through the
engaging a slotv I20 in the head. of a slotted mem-v
Work‘, ‘thefsudden thfrust or piercing tends to
ber I2 I‘ mounted in‘ a counterbored portion [22.
overcome the spring pressure of rod 11 and lift
of plug 123 turnablysupported' in an. aperture
the‘ presser foot '15 from the work. It is desir
able to have the spring 95 of rod ‘I1. weak enough 45 of frame I0.
By loosening the thumb screw I26}. arm [24
to allow the presser foot. to. yieldv upwardly in.
maybe moved, and in so. doing shift‘r the position.
order to allow the work. to be readily manipu
of slot I20 in member I'ZI, thereby. changing the,
lated, and to prevent undue pressure on thework.
turn. connected to 'a manually operated shift
plate (‘not shown) all. as shown and‘ described
In order'to. overcome any. excess upward‘ move
. to be described hereinafter.
angular relation of' slot I20 and‘ lever II‘4., Arm.
ment thereof, a spring actuated arm 96 may be 50. I24. is provided with an. arcuate sl’ot. I25 in. order.‘
to‘ allow‘ said arm to be‘ moved relative to loos
provided‘, which is in close relationship with the,
ened screw I26 in order to adjust- the position
upper endv of' rod 11 so that the rod in moving
of member I20 and secure the slot, IZI' therein in’
upward will strike the end of the arm 96, and‘
any desired adjusted position relative to fol.
be forced. back, thereby tending to hold the
presser foot 15 in proper operative position rela 55 lower' H9. It‘ will be apparent, therefore,‘ that '
the more slot H0‘ is turned towards the vertical,.
tive to the work. Arm 96 is mounted on. a pivot
the greater will be the feeding motion of plate
stud‘ (‘not shown) carried by a bar 98 suspended‘
I35 due to the fact that. lever‘ H4, which. is
from head II_' and is urged by a spring (‘not
pivoted upon lever‘ H5, wiIl. be" raised a greater
shown) downwardly to hold an adjusting screw
Illlv in abutment. with a suitable stop (not shown)‘. 60. amount; lever H5 also will be rocked a propor
tionately greater amount. If. it be desired to de
The screw III! is provided sothat the. gapbe
crease the movement of plate- I35, the~ slotted
tween rod‘ ‘IT and arm 96 may be varied to best;
member IZ-‘I will be‘ adjusted‘ in. the opposite di
suit. conditions and. when. properly set the. screw
rection so that‘ the slot therein will’ be‘ moved.
is locked in position by any suitable, means, such
65 more towards'th'e horizontal. Sincel'ever H5 is
as'a knurled‘nutI‘03'.
. .
.
fastened to a fork I121 (Figure. 2) connected to
Referring to Figure 1,_ the mechanism for pull
a material‘ feed arm I28", the resulting“ to. and
ing the: loop as formed from the thread will now
fro motion imparted to arm I28 can be‘ varied,
be. described brie?y since it forms no part of this
thereby making it‘. possible to‘ adjust. the length.
invention. A gear I75 meshing with the gear
, and make longer orv shorter stitches as‘ required.
4.4; but rotating at a greater speed. is ?xed to. a
The up and down movement of arm I28
im
shaft I16; mounted. in suitable bearings I ‘IT of
parted by a cam H0 with which coacts a cam
head‘ l.i~ and of‘ a stationary member or. drum
follower I29 provided on an arm of‘ lever I30‘
I18‘, suitably‘ supported by head II and frame
I0‘; A gear through suitable driving connectionsv
shown‘ and‘ describedvv in my co-pending applica .. the lever supports- one‘ end of an adjustablejlinln
2,407,986
5
I32 which is connected to a depending arm I33
position of member I2I by varying the throw of
lever arm II 4 which controls the horizontal dis
of member I28. The right end of arm I28 (Fig
ures 1 and 6) is mounted on a pivot stud I40 sup
tance traveled by bar I28. The movement of arm
300 causes link 3I0 to remove the shoulder 3| 0
of nut 3II from holder SM and advance nut 3I2
until its shoulder 3I9 abuts the other end of
holder 3 I4 thus halting further movement of arm
ported in lug I4I of an arm I42 loosely mounted
on stud I34. ()ne end of this stud is mounted
in a spacing block I43 suitably secured to frame
I0.
Material feed plate I35, attached to arm I 28,
300. Member I2I retains this position until the
foot pedal 300 is released, whereupon spring 3I‘I
is provided with a corrugated or toothed work
feeding surface adapted to engage and advance 10 restores the device to its former position. It will
the work. This plate may be of the usual type
be apparent that the greater the distance be
employed in sewing machines and is arranged
tween shoulder 3I9 and the end of the holder
to project upwardly through a slot in plate I3
, 3M, the greater will be the movement of arm 300
over which the work is fed to and from the nee
to set member I2I, which consequently results in
dle. IAS each stitch is completed, the arm I28 15 shorter stitches.
through its connections, is caused to index, that
Referring to Figures 4 and 5, another modi?ed
is,’ the arm descends slightly below the level of
stitch control device is shown in which alternate
throat plate or table I3 leaving the work resting
short and long stitches are automatically pro
thereon and then the arm moves up, engages and
duced for. decorative work. According to this
advances the work in readiness for the next 20 embodiment, a driven sprocket 320 ?xed on a
stitch, the work remaining in this position while
shaft 32I imparts motion to the eccentric III and
the plate I35 returns to its original position.
cam IIO to actuate the material feed arm I28 in
Referring to the modi?cation shown in Figure
the same manner as shown in Figures 1, 2 and 3.
3, the general operation of the feed arm I28 is
A gear 322, ?xed on shaft 32I, meshes with and
the same as hereinabove described. Mechanism
drives a gear 323 and its attached gear 324 loosely
has been provided, however, to make adjustments
mounted on stud IZIa, while the gear 324 in turn
in order to control the stitch length for normal
drives a gear 325 and a cam 326 loosely mounted
stitching, and also make longer or shorter
on shaft 32I. In this manner, the gearing 322,
stitches as the case may be according to the re
323, 324 and 325 drives the cam 326 at one-half
quirements with respect to the particular work
the speed of cam IIO.‘ Cam 326 engages a cam
being sewed. As an example, in sewing the sides
roller 32‘! carried by a cam lever 328 mountedon
of the fingers of gloves, a normal stitch length
shaft I2I. Lever 328 is adjustably attached‘ to
is generally used for the major portions of each
an arm 329, clamped on shaft I2I by a thumb
glove. However, when the operator proposes to
screw 330. The lower portion. of arm 329 is pro.
sew the tip portion of the ?ngers, the normal 35 vided with an elongated slot 33I adapted to en
stitch may be found to be too long for satisfac
gage thumb screw 330. By loosening the thumb
tory work, and hence means is provided for
screw 330, the arm 329 may be moved and in so
quickly shortening the stitch length. At this
doing shift the position of slot I20 of shaft I2I
time, the operator depresses a foot pedal 308
resulting in more or less movement of arm I 28, as
which through connections to be described pres 40 heretofore mentioned.
‘
ently, shifts the position of the slotted stitch con
The cam 326 has a high portion 332 and a low
tro1 member I2I to produce shorter stitches for
portion 333, the surface 332 being‘considerably
sewing the ?nger tip portion of the glove. When
longer than 333 and therefore when it engages
the sewing of the tip portion is completed, the
follower 32'! it holds the slotted head of‘ stitch
operator’s foot is released from the pedal and
control member I20 in a position to produce a 7
normal stitching will be resumed.
long stitch, as the follower 321 rides o? surface
An arm 300 (Figure 3) is clamped to member
332 and approaches surface 333, the slotted head
I2I and at its lower end supports a forked head
of member I20 is turned to a position to produce
30I and a head 302 connected by means of a rod
a short stitch. The continuous rocking of the
303 to an arm 304 ?xed on a pivot shaft 305. An 50 slotted head results in alternate long and short
stitching of the work.
In the mechanisms hereinabove described it
arm 306, also ?xed on shaft 305, is actuated by
a link 301 connected to a foot pedal 308 mounted
on a pivot 309. The forked head 30I carries an
adjustable link 3I0 which at its other end is pro
vided with knurled nuts 3H and 3I2 which are
turnably and slidably mounted in an aperture 3 I 3
of a holder 3I4 secured in a suitable manner to
will be evident that I have provided means for
forming stitches of a predetermined length, and
selective mechanism operative either manually or
automatically to vary the stitch length by con
trol of the work feeding device in accordance
with the wishes of the machine operator or the
demands of a given piece of work being sewed or
the frame of the machine. The aperture 3I3 is
open at the top and exposes a portion of the
shanks 3I5 of the nuts 3H and 3I2, the exposed
portion of the shanks being engaged by prongs of
a flat spring 3I6 which tend to hold said nuts
(it)
decorated.
The invention above described may be varied in
construction within the scope of the claims, for
from turning after the ?nal adjustments have
the particular device, selected to illustrate the
been made.
invention, is but one of many possible concrete
embodiments of‘ the same. It is not, therefore,
to be restricted to the precise details of the struc
ture shown and described.
What is claimed is:
..
The knurled nut 3| I provides means for ad
justing the position of member I2I to obtain the
length of stitch best suited for different types of
Work. A spring 3I'I having one end attached to
arm 304 and its other end secured to a station
1. In a sewing machine, a work support, means
ary part of the machine (not shown) normally
for feeding work to be sewed along said support
tends to hold the shoulder 3I8 of nut 3“ in en
including a work feed ‘bar, and mechanism. for
gagement with holder 3I4. The knurled nut 3I2
varying the amount of movement of said means,
governs the length of the short stitch. That is,
said mechanism comprising a lever associated
with the foot pedal 308 depressed the rod 303
with said bar, a second lever pivoted on said
will move arm 300 and consequently change the 75
?rst-named lever, means for oscillating said sec
2,407,986
8
including a workfeed bar, and mechanism for
ond lever, a follower carried by said second lever,
varying the amount of movement of said means,
a slotted ‘member normally engaging said fol
said mechanism comprising a lever associated
lower, anadjusting rod secured to said ‘member,
with said bar, a second lever pivoted on said
adjusting means connected to said rod for set
?rst-named lever, means for oscillating said sec
ting the length ‘of stitch to be made at a prede
ond lever, a follower carried by said second ‘lever,
termined length, a manually operated device at
a slotted member normally engaging said fol
tached to said member for shifting said member
lower, means for shifting the position of said
to change the stitch from one length to another
slotted member to vary the extent of movement
at the will of the operator while maintaining
the adjustment of said adjusting means undis 10 of said lever and travel of said feeding means, and '
a manually adjustable device connected to said
turbed, and means for automatically moving said
member for setting the stitch length within pre
device in the opposite direction to reset said mem
determined limits, said device including ‘a rod
, her in its original adjusted position.
attached to said member, a block slidably mount
1 '2. In a sewing machine, the combination with
a work support, of mechanism for feeding work 15 ing one end of said rod and adjustable nuts
mounted on said rod at opposite ends of said
to be sewed along said support, means associated
with said mechanism for adjusting the length of
block.
.
'
>
stitch to» be ‘made, said means including a stitch
41. In‘ a sewing machine, a work support, means
determined‘ normal ‘stitch length, means nor
member for setting the stitch length within pre- ‘ 7
for feeding work to be sewed along said support
length control member, means for setting said
member to form stitches of various lengths, an 20 including a work feed bar, and mechanism for
varying the amount of movement of said means,
arm- ?xed to said member, an adjusting rod, a
said mechanism comprising a lever associated
connection between said arm and one end of said
with said bar, a second lever pivoted on said
rod, a holder supporting the other end of said rod,
?rst-named lever, means for oscillating said sec
adjusting nuts on said holder supported end of
said rod, said nuts being located on said rod at 25 ond lever, a follower carried by said second lever,
a slotted member normally engaging said fol
opposite sides of said holder, means for secur
lower, means for shifting the position of said
ing said nuts in adjusted position on said rod
slotted member to vary the extent of movement
and relative to said holder, one of said nuts be
of said lever and travel of said feeding means,
ing adjustably positioned on said rod to control
the position of said member for forming a pre 30 a manuallyadjustable device connected to'said
mally‘gholdin'g said nut in engagement with said
holder, and manually operated means for mov
determined limits, said device including a rod at
tached to said member, a blockslidably mounting
one end of said rod and adjusting screws mount
one of said nuts from said holder and cause said 35 ed on said rod at opposite ends of said block,
a second rod also attached to said member,“ and
other of saidnuts to engage said holder where
manually operated means operative at will for
by to modify the‘ movement of said feeding mech
moving said second rod and shift the position ‘of
anism and thereby control the length of stitch
said member for changing the stitch length with
'
,
3. In, a sewing machine, a work support, means 40 in said set limits.
CARL W. JOHNSON.
for feeding work to be sewed along said support
ing said member'to displace said rod and said
formed.
'
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