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Патент USA US2120127

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June 7, 1938.
G. A. FLECKENSTEYIN ET AL
’
2,120,127
SEWING MACHINE
Filed June 19, 1955
5Sheets-Sh9et 1
June'7, 1938'.
e. A. FLECKENSTIIIIN Er AL
2,120,127
SEWING MACHINE
5 Sheets-Sheet 2
Filed June 19, ' 1935
avwvwbo/vé
(.760rye A.Flcckenstein
and
Maw L. Waterman
CW
Jun?‘ 7, 1933-
e. A. FLECKENSTEIN El‘ AL
2,120,127
SEWING MACHINE
Filed June 19, 1935
5 Sheets-Sheet’ 3
George A.l‘7lecken stein
an‘? Max L. nizz‘erm'van
oggw-
53” /W”% W,
,
Jl’me: 7, 1938-
G. A. FLECKENSTEIN ET AL
2,120,127
SEWING' MACHINE 4
Filed June 19,,’ 1935
5_ Sheets-Sheet 4
Gemye A. l’leckensz‘cin
L. Miernm -
June 7, 1938.
e. A. FLECKENSTEIN Er AL
'
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smwme ‘MACHINE
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‘2,120,127 ‘
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Filed June 19. 11935
36'
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5 SheetsAShe'et 5 -
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George A.I7écl'eia8fein
and Mmizzb. nhterman
Patented June 7, 1938_
2,120,127
UNITED STATES PATENT OFFICE
2,120,127 '
SEWING MACHINE
George A. Fleckenstein, Stratford, and Max L.
Waterman, Fair?eld, Conn, assignors to The Singer Manufacturing Company, Elizabeth.
‘ N. J., a corporationpf New Jersey
Application June 19, 1935, Serial No. 27,300
16 Claims. ‘ (01112-241)
' I
This invention relates to sewing machines and
more particularly to high speed lock-stitch sew
ing machines.
‘
An object of the invention is'the provision of
an improved form of balanced take-up mecha
nism for the needle-thread which will operate
at high speeds with a minimum of vibration. ‘
With the above and other objects in view, as
will hereinafter appear, the invention comprises
.10 the device's, combinations, and arrangements of
parts hereinafter set forth and illustrated‘in the
accompanying drawings‘ of a preferred embodi
ment of the invention, from which the several
features of the invention and the advantages at-_
15 tained thereby will be readily understood by those
skilled in the art.
In the drawings:
rotations for each rotation of the needle-bar shaft
1.' Journaled in the bearings l6 and IT in the 5
bed I is a feed-shaft 18 having a pulley l9 ?xed
to one of its ends and driven by means of the
clip-belt 20 from the pulley 2| carried by the
shaft 1 at the ratio of 1 to 1.
'
.
Secured to the end of the feed-shaft 18 extend
ing through the bearing I6 is a feed-lift eccentric
22 and ?xed to.the shaft l8 on the opposite side
of the bearing is an adjustable eccentric 23. The
eccentric 23' is the same as that shown in the
co-pending patent application of J“. H._Stearns, 15
Serial No. 735,612, ?led July 17, 1934, and which
is provided with a notch 24 for the purpose of
-
Figure 1 is a side elevation, partly in section,v
adjusting the throw of the eccentric. To effect
adjustment of the eccentric, there is provided a
of our improved sewing machine.
Figure 2 is a top plan view with the cloth-plate
20 and
bracket-arm removed to expose the mech
anism within ,the bed.
is operatively connectedto the pulley H by the
clip-belt I2, the ratio being as 1 is to 2, and,
therefore, the hook-shaft 9 makes two complete
?nger-lever 25 pivoted intermediate its end to
the bed ‘I by means of the pivot-pin 26.‘ One end
of the lever is held against lateral movement by -
,
Figure 3 is an’ end elevation of the machine,
with the face-plate removed. 1
.
_
'
Figure 4 is a sectional view taken substantially
>_ 25 along the line 4—4 of Figure 1.
.
a boss 21 formed with an open ended guideway
and is provided with a locking nose 28 which is
adapted to enter the slot 24 in the eccentric. The‘
other end extends upwardly through an opening ,
Figure 5 is a sectional view taken substantially . in the bed and the lever is normally held in the
position shown in Fig. 1 by means of a plunger
along the line 5-5 of Figure 1.
_
29 urged upwardly by a spring 30 located in a
Figure 6 is a rear elevation of the head of the
machine showing the Dresser-foot lifting and boss 3| formed on the bed of the machine. To
adjust the stitch-length the operator depresses
Figure '7 is an end' elevation of the head of ‘the ?nger-lever 25 and rotates the shaft 18 by
- tension-releasing mechanism.
the machine.
Figures 8 and 9 are sectional views taken sub
35 stantially along the lines 8—8 and 9—9 of Fig
ure 3.
Figure 10 is a bottom plan view of the throat
plate.
.
g
.
v
.
Figure '11 is'an enlarged sectional view taken
40. along the line I I-—'H of Figure 10.
Figure 12 is a fragmentary view of one end of
the feed-bar sectioned along the line I2--|2 of
Figure 2.
‘
'
turning the balance-wheel 8 until the desired
stitch-length is obtained.
The front side of the bed I, which is \nearest
the operator, is formed with upstanding bearings
32 and 32' in which is journaled' a short shaft
33 having a feed-rocker 34 ?xed thereto and is
rocked back-and-forth by a pitman 38 having one
of its ends secured to the eccentric 23 and its 40'
other end secured to a short shaft. 35 carried by
the feed-rocker. A feed-bar 36, carrying a feed
dog 39, bridges the space between the feed-rocker
In the embodimentof the invention selected " 34 and the feed-shaft l8 and has one of its ends
for illustration l is the inverted trough-shaped‘ journaled on the short shaft 35 carried by the
bed of the machine to which is secured by the feed-rocker and its other end overlying a block
screws 2' the standard 2 carrying an overhang- " 31 which cooperates with the feed-lift eccentric
22. The feed-bar 36 is formed with a depending
ing bracket-arm 3 which terminates in' a hollow
head 4. . Journaled in the spaced bearings 5. and portion 40, and secured thereto by the screws 4|
6 in. the overhanging arm 3 is a needle-bar driv- ' is a plate 42 which underlies the eccentric '22.
ing-shaft ‘I having the usual‘ balance-wheel 8 . From the foregoing, it will be observed that ‘when
fixed thereto and journaled in the bearings‘ I3
. and M in the bed is a .rotary hook~shaft 3 hav
ing ayrotary hook I5 ?xed to one end thereof
the feed-shaft l8 rotates, the feed-bar 36 is ‘given
a feed-and-return movement by the‘eccentric 23,
pitman 38 and feed-rocker 34, and a rising and
55- and fixed to the other end is a pulley I!) which , falling movement by the eccentric 22.
65
2,120,127v
2
Located, at one side of the needle-bar shaft ‘I
and journaled in bearings 45 and 45a carried by
tension, and comprise a ?nger lever ‘I9 and a
treadle controlled lever 60 pivoted to the over
The lever 80 is
-
the wall in the overhanging bracket-arm 3 is a hanging bracket-arm at 8i.
provided with a forwardly extending .arm 82
rock-shaft 46 formed with a boss 46’ on the end
extending into the hollow head'él. Secured to the which overlies the eccentric portion of the ?nger
boss 46' by the screw 41’ is a take-up lever 41 - lever 79 and when the ?nger lever is swung about
its pivot 83 the cam portion engages the arm 82
‘ made of light material, such as, aluminum. To
the end extending into the bracket-arm there is and ‘swings the lever 80 about its pivot. The lever _
80 is connected to the presser-bar by means of
secured an arm 48 which is operatively connected
the arm 84 which extends forwardly into the
10 by means of the pitman 49 to the crank 50 formed
on the needle-bar actuating shaft ‘I. Disposed hollow head and the link 85‘_Whi0h has one of
is a second shaft 52 journaled in‘ the bearings
its ends pivoted to the arm 84 and its other end
slotted to embracea stud 86 carried by the block
87 which is clamped to the vpresser-bar ‘I4 by the
the hollow head 4 there is secured by the screw
when the presser-foot is raised, the head 4 is
on- the other side of the needle-bar shaft 1 and
substantially diametrically opposite the shaft 46
screws 88.' To provide mechanism for concomi
15 53 and 53a. The shaft 52 is formed with a boss
52’ and on the end of -the shaft extending into _ tantly releasing the tension on the needle-thread
formed with a boss 89 which is apertured to re- 54' a take-up lever 54. _ To the other end of the
ceive a rock-shaft 90. Fixed to the end of the
shaft which extends. into the ' overhanging
’ shaft outside of the hollbwrheaddis a‘ camlever
20 bracket-arm 3v there is fixed a lever 55 whichis
operatively connected by a pitman 56 to the crank 9|‘ (Fig. 6) and ?xed to the end of~the shaft _
20'
within the hollow head is a cam 92 which is‘adapt
From the above it will be observed that the r ed to engage the usual releasing pin 93 carried
take-up levers are arranged on opposite sides of by the tension device 63. When the presser-foot
is raised, either by the‘ ?nger lever or foot-treadle, 25
25 theirlactuating shaft and substantially 180° apart the cam lever 9I is shifted, thereby rocking the
_ and are rigidly connected to short shafts which
extend through the partition or wall separating ' shaft 90 in a clockwise direction about its axis
and causing. the cam 92 within the hollow head
the hollow head from the overhanging bracket
arm and are actuated by mechanism located to engage the releasing pin 93 and separate the
tension-disks.
30 within the bracket-arm, the mechanism, for each
51 formed on the needle-bar shalt ‘I.
Fixed to the ,bed _I-is a throat-plate 94' formed
with the usual feed-dog slots 95'and needle aper
ture 96. To overcome “looping" of the needle
both statically and dynamically as each action on thread, characterized by the projection from one
face of the stitched work of loose loops of needle-_ 35
35 one side of the needle-bar shaft is counteracted ' thread, which sometime occurs when a lock-stitch
by an equal and opposite reaction on the other‘
is operated at high-speed, there is rig
side of the shaft. It will also be observed that machine
idly attached .to the under side of the throat
the ends of the take-up levers overlap. This con
struction ‘permits the pivotal axes of the levers plate a cup-shaped button 91, (Fig. .11) , having an '
to be placed near the needle-bar shaft thereby upstanding wall 91' and a base 98 which'is formed
making a more compact arrangement of _ the' _ with an aperture 99 in vertical alinement with
the needle-aperture 96 and is spaced therefrom
‘ take-up lever being the same and arranged com
plemental to each other. This construction‘af
fords a take-up. mechanism which is balanced
parts.
A face-plate 59 having slots therein is secured
to the hollow head 4 by the screws 60 ‘and the
free'ends of the take-up levers 41 and 54 are
to provide a clearance recess between and ad
jacent the verticallyspaced apertures.
I
'To lubricate the mechanism within the hollow
4, the latter is formed with a depression I00
formed with laterally ‘extending offset portions _ head
6| and 62 which are provided with thread-eyes in which . excess lubricant collects. Wicks IOI
have one of their ends depending in the lubricant
and extend through the arcuate slots inv the face
plate 59. The face-plate carries a tension device ' reservoir I00 and their other ends secured to the
pad I02 which is carried by the plate I03 ?xed 50'
50 63, a thread-guide '64 and a ?at leaf-spring 65 to the head of the machine and the~pad I02 is
which acts as a thread-guide and prevents the
to be engaged by the upper end of the
take-up levers from throwing a loop of needle- positioned
needle-bar link ‘I3 for-.the'purpose of lubricating
thread in front of the needle. The thread is
crank-pin 69. The wick I04 has one of its
preferably led from the guide 66 to the tension the
ends depending in the reservoir and its other end 55
device
63,
the
guide
64,
the
eye
in
the
offset
end
55
threaded into an aperture I06 running longi
of the take-up lever 41, the thread-eye in the tudinally of the bushings 45 and 45“ and com
end of the'take-up lever 54,_the guide 65 and' .municating with the rock-shaft 46. The wick
thence to the needle.
'
As shown, the shaft 1 has secured to its-end
80 a counterbalancin'g disk 66 having a crank“
attached thereto by a screw 61 and disposed with
its axis offset ‘from the axis of the shaft 1. A
needle-bar 10 carrying a needle ‘II extends
through a suitable bearing ‘I2 in the bottom of
65 the head 4 and is operated by the usual pitman
, 13 having one of its ends pivoted to the crank
pin 69 and the other end pivotally secured to
the needle-bar ‘I0. A presser-bar ‘I4 carrying a
.presser-foot ‘I5 which cooperates with the feed
70 dog 39 extends through a suitable bearing 16 in
the head and is spring urged downwardly by, the
?at-leaf spring 11 which acts against the rod 18
carried‘ by the presser-bar ‘I4.
75
I05, likewise conducts lubricant upwardly by cap
illary attraction to the aperture I08 in the bush 60
ings 53 and 53*.
_ '
The bracket-arm 3 is formed, with an interiorly
arranged upstanding ?ange H0 and is inclined
.downwardly towards the head to provide an oil
reservoir III into which the ends of the lever 65
49 and pitman 49 dip thereby lubricating the take
'up actuating mechanism which is located in the
bracket-arm by the “splash system".
To lubricate the bearings and pivotal connec
tions located below the cloth-plate Ill, the base
of the machine is inclined so as to cause excess
oil to collect in a'sump “4 located in rear of the
bed and adjacent the pulley end of the feed
‘Separate means are provided for raising the ' shaft I8. A wick I I5 conducts lubricant from the 75
sump I,“ to the bearing 32 and a second wick H6
presser-foot and simultaneously releasing the
3
2,120,127
located within the bracket-arm and actuated by
said needle-bar shaft forimparting oscillatory
movements to said rock-shafts.
conducts lubricant to the bearing 32'. In both
instances the wicking is threaded into‘ a‘ longi
tudinally arranged aperture in the bushings and
4. A sewing machine having in combination, a
hollow overhanging bracket-arm terminating in
engages the rock-shaft 33,. A wick I I8 is thread
ed through the tube H9 and has one of its ends
depending in the sump H4 and its other end
raised above the bed and supported by meansof
the tube H9 (see Fig. 9). To conduct.lubricant
from the wick IIB'to the pivotal connection for
»
10 the feed-bar the shaft 35 is formed with a lon-,
gitudinally arranged groove in which is ?tted a
wick I I1. When the feed-rocker 34 rocks back
and forth the end of the wick II'I intermittently
engages and wipes-oil from the endof the wick
15 H8 and conducts it to the bearing for the feed
rocker.
.
32.
>
'
>
v
The wick I22 conducts lubricant to the depres
sion I23 formed in the feedebar 36. When the
feed-bar 3B executes its four-motion movement
25 the fibrous material in the depression wipes the
oil from the wick I22 and the oil is led to the
bearing block 31 and eccentric 22 through the
'
aperture-I24 and the oil conduits I25.
To lubricate the eccentric '23 a wick I2‘! is pro
30 vided which conducts'the oil to the ?brous mate
rial I 28 carried by the pitman 38 an aperture
being provided for conducting the oil from the
?brous pad I28 to the eccentric.
From the foregoing description considered in
35 connection with the accompanying drawings, the
and eccentric means carried by said needle-bar
shaft and operatively connected with said rock
shafts for imparting oscillatory movements to 15
_
'
'
5. The combination with a sewing machine
having a hollow bracket-arm terminating in a
hollow head, a needle-bar shaft journaled in said‘ ,
bracket-arm, a needle-bar actuated thereby, a 20
rock-shaft journaled in said bracket-arm and
arranged paralled to said needle-bar shaft, a -
second rock-shaft journaled in said bracket-arm,
said rock-shafts being arranged on opposite sides
of said needle-bar shaft and disposed substan 25
tially 180° apart, take-up levers carried by said
rock-shafts and cranks carried by said needle
bar shaft and operatively connected to said rock
shafts for actuating said rock-shafts about their .
longitudinal axes.
30
‘
6. A sewing machine having in combination, a
bracket-arm terminating in a hollow head, a
needle-bar shaft journaled in said bracket-arm,
a plurality of rock-shafts journaled in said hol- '
low head and arranged parallel to the needle
construction, manner of operation and several
bar shaft, *take-up levers carried by said rock
advantages of our improved machine will be
clearly and fully understood. It is apparent that
shafts, eccentric means on said needle-bar shaft,
and mechanism for connecting said rock-shafts
such a machine has a wide variety of uses, and
to said eccentric means.
40 it will be understood that the form, construc
tion and arrangement of the several elements em- .
ployed may be varied. Therefore, the privilege
is reserved of resorting to all such legitimate
changes thereinvas may be fairly embodied with-'
45 in the spiritand scope of the appended claims.
Having thus set forth the nature :of the in
vention, what we claim‘ herein is;—
1. A take-up mechanism for sewing machines
comprising a rotatable shaft, cranks carried by
50 said shaft, a pair of rock-shafts arranged on op
posite sides of and parallel to said ‘rotatable
shaft, take-up levers ?xed to said rock-shafts,
and mechanism for operatively connecting said
cranks with said rock-shafts.
55
and substantially diametrically ‘opposite each
other, take-up levers carried by said rock-shafts,
the_latter.
Th'e wicks I20 and I2i conduct lubricant from
the sump H4 to the bearings I6 and I3, respec
tively, and. are threaded into the hearings in the
.20 same manner as the wick I I5 is threaded into the
bearing
a 'hollow head, a partition separating said
bracket-arm from said hollow head,‘a needle
bar shaft journaled in said partition, a pair of
rock-shafts journaled in said partition and ar
ranged on either side of said needle-bar shaft 10
‘
2. A sewing machine-having in combination, a
hollow overhanging bracket-arm terminating in
a hollow' head, a wall between said hollow head
I
'7. A sewing machine having in combination, a 40
bracket-arm terminating in a hollow head, a
needle-bar shaft formed with cranks and jour
naled in said bracket-arm, a plurality of rock
shafts journaled in said head and arranged par
allel to the needle-bar shaft, take-up levers car 45
ried by said rock-shafts, actuating levers ?xed to “
said rock-shafts, and pitmans connecting the
cranks on said needle-bar shaft with said actuat
ing levers.
-
8. A sewing machine having in combination, 50
an overhanging bracket-arm terminating in’ a
hollow head, a wall in said bracket-arm, a plu
rality of rock-shafts carried by said wall, a thread
take-up lever'carried on one end of each of said
rock-shafts and mechanism within the bracket
arm for oscillating said rock-shafts about their
longitudinal axes.
‘
‘
_
rock-shaft terminating. within the hollow head
9. A sewing machine having in combination, an
overhanging bracket-arm terminating in a hol
low head, a wall .in said bracket-arm, a pair of 60
rock-shafts journaled in said wall, a thread take
and the other end within the bracket-arm, mech
up lever carried on one end of each of said rock
and said bracket-arm, a‘rotary needle-bar shaft
journaled in said wall, a-_rock—shaft journaled in
60 andv extending through said wa-ll, one end of said
anism disposed within the bracketearm and op
eratively connecting said needle-bar shaft with
65 one end of the rock-shaft for operating the latter,
and a take-up lever carried by the other end
shafts, said take-up levers being oppositely di
rected, and mechanism within the bracket-arm
for oscillating said rock-shafts about their longi
3. A sewing machine having in combination,
said take-up levers to move upwardly and the
other of said take~up levers to move downwardly.
I . an overhanging bracket-arm-terminating in. a
f: 10. A sewing machine having in combination,
of the rock-shaft. __ ,
_
65
tudinal axes in such a manner as to cause one of
' an overhanging bracket-arm terminating in a 70
70 hollow head and a partition between said hollow
head and said bracket-arm, a needle-bar shaft hollow head,‘ a shaft journaled in said bracketf
arm, an eccentric element carried by said shaft,
journaled in said partition, a plurality of rock
shafts journaled in said ‘partition parallel to and
on opposite sides of said needle-bar shaft, take
75 up levers carried by said rock-shafts, and means
a ’ rock-shaft
journaled in
said bracket-arm,
mechanism operatively connecting said eccentric
element with said rock-shaft, all of said mech- 75
2,120,127
4..
an overhanging bracket-arm carrying a hollow
a take-up element actuated by said rock-shaft. . head, 'a wall in said bracket-arm, a shaft jour
anism being located within said bracket-arm and
11. A sewing machine having .in combination,
an overhanging bracket-arm terminatingln a
naled in and extending through said wall, a thread
take-up lever carried on one vend of said shaft
hollow head, a needle-bar actuating'shaft jour- ‘
and mechanism within the bracket-arm and op-_
naled in said "bracket-arm, eccentric elements
carried by; said shaft, a pair of rock-shafts jour
eratively connected with the other end of said
shaft for oscillating said shaft about its longi
naled in said bracket-arm, mechanism oper
atively connecting said eccentric elements ‘with
10 said rock-shafts, ‘said mechanism being located
within said bracket-arm and a pair of take
up elements actuated by said rock-shafts.
12. A sewing-machine. having in combination,
an overhanging bracket-arm terminating in a
-15 hollow head, a needle-bar actuating shaft‘jour
naled in spaced bearings carried by said bracket
arm, an eccentric element carried by said shaft
_‘and located between said bearings, a rock-shaft
tudinal
axis.
'
-
'
15. A sewing machine having in combination
a hollow bracket-arm carrying a hollow-head, 10
a rotary needle-reciprocating shaft journaled in
said bracket-arm, take-up actuating shafts jour
naled in said bracket-arm and disposed at oppo
site sides of and substantially parallel to said
needle-reciprocating shaft, a take-up element 15
carried by each of said take-upactuating shafts
and mechanism within said bracket-arm for op
eratively connecting said needle-reciprocating
e
journaled in said bracket-arm, mechanism oper-H shaft and said take-up actuating shafts.
16. A sewing machine having in combination
20 atively connecting said rock-shaftand said ec
centric element, said mechanism‘ being located a hollow bracket-arm provided with a bearing
within said- bracket-arm, and a thread take-up wall, a needle-bar shaft journaled in said wall,
element actuated by said rock-shaft.
take-up actuating shafts disposed at opposite
13. A sewing machine having in combination, ,1 sides of and parallel to said needle-bar shaft, a
an overhanging bracket-arm carrying a hollow take-up element carried by each of said take 25'
up shafts at one side ,of said wall and mechanism
‘head, a wall in said bracket-arm, a take-up actu
ating shaft journaled in and extending through operatively connecting said needle-bar shaft and
- said wall, thread take-up means carried by said
shaft and located atone ‘side of said wall, and
30 mechanism within said bracket-arm and located
at the other side of said wall for actuating said
shaft.
'
said take-up shafts, ‘said mechanism being dis
posed on the-other'slde of said wall and‘ within
said bracket-arm.
'
GnoRGE A. FLECKENSTEIN.
'
14. A sewing machine having in'combination, I
_
.
MAX L. WATERMAN.
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