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Патент USA US2410790

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Nov. 5, 1946.
‘
_F. PA'R'RY
2,410,790
FEED REGULATING _MEANS FOR SEWING MACHINES _
Filed June‘ 12, 1945
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F.. PARRY
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FEED REGULATING MEANS‘ FOR SEWING MACHINES
' Filed June 12, 1945 -
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I Nov. 5, 1946.
-
' F. PARRY
2,410,790
_ FEED REGULATING MEANS FOR SEWING MACHINES
Filed June 12, 1945
I5 Sheets-Sheet 3
Patented Nov. 5, 1946
v2,410,790 *
‘.UNl'l‘ED “STATES PATENT OFFICE,
2,410,790
FEED REGULATING MEANS FOR SEWING
'
MACHINES
Frank
Parry, Bridgeport, Conn.,,assig11or to The
Singer
Manufacturing Company, Elizabeth,
N. J., a corporation of New Jersey
Application June 12, 1945, Serial No. 599,059
' 10 Claims. (01. 1129-210)
2
Fig. 3 is a vertical section taken substantially
on the line 3—3 of Fig. 1.
r
v
Fig. 4 is a bottom view of the machine shown
in Fig. 1.
Fig. 5 is a detail sectional view illustrating im
proved means for pivotally mounting in the
bracket-arm head an oscillatory needle-bar frame
later to be described.
Fig. 6 is a perspective view of an adjusting
10
screw later to be described.
.
Referring more speci?cally to the drawings,
the invention is disclosed as embodied in a sew
ing machine having a frame including a work
supporting cloth-plate or bed I and a bracket
arm secured to the bedand comprising a stand:
15 ard 2 and an overhanging arm 3, supporting at
its free end a bracket-arm head 4. Journaled in
work-feeding elements, thereby to vary the length
anti-friction bearings 5 and 6, and disposed
of the stitches produced.
lengthwise within the arm 3, is a main or needle
It will readily be perceived that with a con~
actuating shaft 7, carrying, at its rear end,
struction of this nature it is important that the 20 bar
a combined belt and hand wheel 8 having a V
'
"
feeding stroke of the needle
shaped annular groove 9 adapted to receive a
driving belt by means of which the shaft may be
rotated from any suitable source of power.
or the needle will result.
,
Secured upon the shaft 7, adjacent its rear
This invention has as its primary object to 25 end, is a grooved pulley I 0 which through a clip,
provide improved ‘means for simultaneously and
belt! I drives, in one-to-one ratio, a similar pulley
Another object of the invention is to provide
the operator may, with
one hand and by a single manipulation of one
element, simultaneously lock one portion of the
'
'
both the upper and the 35
l2 ?xed upon a lower rotary shaft E3. The shaft
[3 is journaled in bearings l4, l5 and I 6 which
are respectively carried by lugs l1, I8 and I9
formed integral with and depending from the
under side of the bed I.,
Within the bracket-arm head 4 there is mount
ed, for oscillation, a needle-bar frame 20 having
upper and lower arms 2| and 22 in which is
reciprocably mounted a needle-bar 23, carrying,
_ at its lower end a pair of eye-pointed needles n.
ment of both eccentrics.
The needle—bar is reciprocated in its bearings in
,
the arms 2| and 22 by a link 24, connected, at
With the above and other objects in View, as 40
will‘ hereinafter appear, the invention comprises
its other end to a crank pm 26 carried by a crank
disk 21 secured to the forward end of the shaft 1.
Thus rotation of the shaft 1 eiiects endwise re
ciprocation of the needle-bar and the needles '
45 carried
thereby.
_
Mounted for vertical reciprocation in a tubular
bearing b secured in the bracket-arm head 4, is
those skilled in the art.
a spring-depressed presser~bar c which carries,
In the drawings,
at
its lower end, a presser-foot d. This presser
Fig. l is a longitudinal sectional view of a 50 foot is adapted -to hold the work on a throat
sewing machine embodying the present inven
plate p, supported by the cloth-plate I, and to
tion.
cooperate with a serrated feed-dog, located be
neath the throat-plate, in the. feeding of the
Fig. 2 is a vertical section taken substantially
onthe line 2-—2 of Fig. 1.
l
>
work.
65
.
‘
Cooperating with the needles, inthe forma
$2,410,790
0
4
Upon one end of the shaft 55, there is secured a
rock-arm 58 pivotally connected at 59 to one
end of a pitman 69, the other end of which is
tion of stitches, are two rotary loop-takers 15
located beneath the cloth-plate i and each driven
at a two-to-one ratio from the shaft l3 by gears
28, 29.
formed‘ as a strap 51 surrounding a lower feed
drive eccentric 62 forming a part of a second
The needle-bar frame 20 is secured to a rock
adjustable eccentric device E’ secured upon the
shaft 30 journaled in anti-friction bearings 31 and
32 fitted in bosses 33 and 36 in the lower end of
shaft l3. Thus rotation of the shaft 13 and the
eccentrics 53 and E2 thereon, effects rising-and‘
the bracket-arm head. The bearing boss 33 car- ‘
falling and feed-and-return movements of the
‘(feed-bar 5i and the feed-dog ‘59 carried thereby.
ries a wear-plate 35 against which abuts the lower
The construction of the adjustable eccentric de
arm 22 of the needle-bar frame. That end of the
vice E’ on the shaft I3, is the same as that car
shaft 36 within the bearing 32 is provided with a
riedlby the arm shaft 1 which, as above stated,
bore 36 into which is threaded a screw 31 having.‘
is ~fully disclosed in United States Patent No.
“2,128,031 and includes a member £39’ which is
rotatable relative to its supporting shaft l3 to
washer M] in said counterbore.
vary the eccentricity of the eccentric 62.
split, as shown at M in Fig. 6, and is ‘provided
As illustrated in the drawings, the machine
with an axial bore 4-32 into which is 7threadedthe1 5 '
body portion of an expansion plug 43 having _a ~,». also includes means for providing a. thread-clear
ance space between the nose of a thread-carrier,
tapered point M engaging the reduced inner’ end
(notyshown) forming a part of each of the loop
of the bore #2. By turning the screw 31, the
its head 38 ?tted within a counterboretezin the.v
bracket-arm head and bearing» against _a spring
takers t, and stop-lugs (not shown) provided by
parts may be drawn intoproper working rela
a throat-plate 1) supported by the bed 'i. This
mechanism forms no part of the present inven
tion and therefore detail illustration and de
scription thereof is deemed unnecessary for this
disclosure. Portions of the mechanism, however,
tion with each other, after which the parts may
be locked in that position by screwing inwardly
the plug 43, whereupon the tapered point M
causes the screw .31 to expand, ‘thus locking the
screw. against accidentally turning.
The needle-bar frame 20 is oscillated about
are designated generally as at.
As hereinbefore indicated, this invention re
the longitudinal aXis of the rock-shaft 30, thereby
to give to ‘the needles n‘ifeedand return move
lates primarily to‘ improved means for simul
the usual lower feeding mechanism hereinafter to
tricity of the upper feededrive eccentric49~and
ments in timed relation ‘with the movementsof .» taneously and synchronously varying the ‘eccen
the lower feed-drive eccentric 62. - This. means
be ‘described, byzme'ans of connections comprising
arock-lever 65' formedlwith ‘a ‘split vlower end '
adapted to be clamped bya rewrote the rock
comprises a manually oscill'atable rock-shaftt3
_ journaled in bearingsl?d, 65 formed in the arm 3.
Secured to the ‘shaft 53,. adjacentone end thereof
and by a set screw 66, is the shank bl of a hand
operativelyconnected toonefend of _a pitman Ill,
lever‘, ?ewhich projects outwardly throughan
the other-end of which‘visformfed. as a strap 4-8
which‘ surrounds an‘eccentric '48 ‘forming, a part
of an‘ adjustable eccentric device, ‘designated gem
v
erallyjas E, secured upon the arm shaft [1. It
will be understood that as the arm shaft
roe '
tated ‘the eccentric 49 actuates jthe'lpitman‘fz?',
opening 69 formed in the. forward .wall of ‘the
standard 2 (see Fig. 3). The outer end of the
lever 58 is flattened, as at ‘it, sovas'to be ‘grasped
‘conveniently between ‘the thumb and?'nger of
auser.
"
_ '
‘
.'_
'_
Secured upon the shaft 63, adjacent the bear
which in turn operates the rock-lever ,?15‘to' oscile
late, the needle-bar frame .20 about the axisjo’fthe
rock-shaft 30. The‘ extent »of"oscillatory motion
ing 64, is an arm ‘it having an offset ?nger ".12
adapted, upon turning of ‘thejslraft'?S in one di
' rection,
‘to enter an apertureor notch 13 formed
imp'artedi’to ‘the needle-bar frame, 'an'drthereby ‘ ‘
in the periphery of the member |39.of th'ejup'per
theamplitude of feeding motion transmitted :to
the?needles is dependent upon the amount ofjec
‘adjustable eccentric device E.
centricity of the eccentric ‘59. In order ‘to vary
the amplitude of the oscillatory movements .ofjth'e '
needle-bar frame to harmonize the same with, the
vertically disposed link 15, located mainly within
the machine standard 2. The lower end ofjthe ,
stitch length to which the lower ‘feeding mecha
nism isa'djust'ed, the eccentric'deviceE is ‘so con
structed that the eccentricity of‘the eccentric 49
may be adjusted between‘certain limits. Inas
link ‘i5 is .pivotally connected, at 16, to the free
1 end of a rock-‘arm Ti carriedby one, end of a
rock-shaft _'i-8nj_ournaled, parallel with the shaft
53, in bearing bosses ":9 depending from, the cloth
plate 8. Fixed to the other end portion of the
rock-shaft '!8,'is an arm‘Bil having ‘an offset ?nger
Bi adapted, upon turning of the rock shaft in
much as the details of construction of this adj ust
able eccentric device forms no part of the;pres—
ent invention, andfurthermore as the. same is
completely disclosed in the United States patent
of Myers, No. 2,128,031, dated August 23,. 1938,
one direction, to enter an aperture or notch 13’
in the periphery of the member 139' of the lower
detailed illustration ‘and descriptionrthereof in
this speci?cation is deemedunnecessary.
Suffice it to say that adjustment of the eccen
tric 49 is effected by relative rotation between
adjustable eccentric device ET.
532 7.1!
3
‘Below the cloth-plate! , the machineis provided
‘with ‘a four-motioned lower feeding mechanism
including a feed-dog 50, carried by a feed-bar
5! having a fork 52 engaging a feed-lift eccen
‘tric 53 secured upon the shaft i3. .At itsf-orward
endgthe feed-bar is'pivotally connected to a. feed
'
, A
The‘shaft'lt is normallybiased in a counter
the member I39 of the adjustable eccentric device
and the arm shaft _'I. , ,
'
Intermediate its ends, the hand-lever 68 is
pivotally connected, at T4, ‘to the upper end of a
q
.
O
clockwise directiomas'seen in Fig. 3, by a torsion
spring 83 surrounding the shaft and having one
end thereof ‘secured to ‘the shaft by ascrewi?d.
The opposite end portion 85,01‘ the spring, Dijo
jects laterally and bears vagainst the underside
of the cloth-plate I. This bias of thelshaft 18 is
transmitted to the shaft 63 by the rock-armf'll,
link 15 and hand-levertii. Thus the ?ngers ‘1'2
and BI of the arms ‘H and 80, respectively; are
normally maintained out of engagement'rwiththe
55Hjourna1ed’ in bearings 5i‘; supported’in bearing _. '75 apertures 13 and 13’ -in the members "l39iand
"rocker 54 secured upon a feed-drive rock-shaft
“bosses 'é'i'iformed'inte'gral ‘with "the bed-plate 1.
2,410,790
6
I39'of the adjustable eccentric devices E and E’.
When it is desired to vary the eccentricity of
5. In a sewing machine having a frame in
cluding a work-supporting plate and a bracket—
the eccentrics 49 and 62, the operator grasps the
portion 10 of the lever 68 and swings the lever
arm carried thereby and having a head, a ?rst
upwardly in the slot 69.
work-feeding mechanism located beneath said
This simultaneously
turns the shafts 63 and ‘I8 clockwise, as seen in
Fig. 3 and places the ?ngers 'I2 and ill in posi
tion to enter the notches l3 and ‘I3’, respectively.
With the elements I39, I39’ held against rotation
by the ?ngers 72, 8I, the operator grasps the
hand-wheel 8 and turns the shaft 1, which
through the pulleys Ii] and I2 and clip-belt I I,
able eccentric device including relatively movable
10
members, the relative movement of which varies
simultaneously and. synchronously turns the
the action of the associated feeding mechanism,
means including a rock-shaft journaled length
wise of said frame beneath said work-supporting
shaft I3. Angular movement of the shafts ‘I and
I3 relative to the members I 38, I39’ varies the
eccentricity of the eccentrics 49 and 62, as fully
plate and an arm carried by said rock-shaft for
locking one of the members of the eccentric de
vice of the ?rst feeding mechanism against move
described in the above mentioned Myers Patent
ment, means including a second rock-shaft jour
No. 2,128,031. Turning of the shaft ‘I in one
direction increases the eccentricity of the eccen
naled lengthwise of said bracket-arm and an arm
needles n and feed-dog 50. Turning of the shaft
in the opposite direction has the opposite effect.
From the foregoing it will be apparent that
a single manually actuable member connected ,to
simultaneously turn both of said rock-shafts and
the arms carried thereby into member-locking
position, and means thereafter to simultaneously
carried by said second rock-shaft for locking one
tries 49 and 62 and thereby increases the length 20 of the members of the eccentric device of the
second feeding mechanisms against movement,
of work-feeding movement transmitted to the
with this improved and simpli?ed feed-adjusting
mechanism an operator may easily, simulta
' and synchronously turn the other members of
neously and synchronously vary the feeding
stroke of both the upper and lower Work-feeding
said adjustable eccentric devices thereby to syn
chronously vary the action of both feeding mech
elements.
anisms.
Having thus set forth the nature of the in
vention, what I claim herein is:
ing a work-supporting plate, a ?rst work-feeding
6. Inca sewing machine having a frame includ
mechanism located beneath said plate and com
prising an adjustable feed-drive eccentric device
including an adjusting member having an aper
second work-feeding mechanism located above 35 ture, a second work-feeding mechanism located
above said plate and comprising an adjustable
said plate, individual means for regulating the
feed-drive eccentric device including an adjust
feeding action of each of said feeding mecha
ing member having an aperture, means for ad
nisms, and a single manual control means for
1. In a sewing machine having a frame in
cluding a work-supporting plate, a ?rst work—
feeding mechanism located beneath said plate, a
simultaneously and synchronously controlling the
justing the feed-drive eccentric of each of said ‘
feeding mechanisms including two shafts jour
' action of both of the feed regulating means.
naled in said frame, a locking arm carried by each
of said shafts and each having a portion designed
to enter one of said apertures, means to bias said
shafts .to a position in which said locking arms
are out of locking engagement withv said adjust
2. In a sewing machine having a frame in
cluding a Work-supporting plate, a ?rst work
feeding mechanism located beneath said plate
and including an adjustablev feed-drive eccen
tric, a second Work-feeding mechanism located
above said plate and including an adjustable feed
drive eccentric, individual means for adjusting
the feed-drive eccentric of each of said feeding
mechanisms, and a single manual control means
for simultaneously and synchronously controlling
the action of both of the eccentric-adjusting
means.
‘
3. In a sewing machine having a frame includ
ing members, and manually actuable means for
moving said shafts in opposition .to said biasing
means to engage said locking arms with the aper
tures in said adjusting members.
50
7. In a sewing machine having a frame includ
ing a work-supporting plate, a ?rst work-feeding
mechanism located beneath said plate and com
prising an adjustable feed-drive eccentric device
including an adjusting member having a periph
ing a work-supporting plate and a bracket-arm
carried thereby having a head, a ?rst work 55 eral notch, a second work-feeding mechanism lo
cated above said plate and comprising an adjust
feeding mechanism located beneath said plate, a
able feed-drive eccentric device including an ad
second work-feeding mechanism carried by the
bracket-arm adjacent said head, individual means
adjacent each of said feeding mechanisms for
regulating the feeding action thereof, and a single
manual control means for simultaneously and
synchronously controlling the action of both of
the feed regulating means.
4. In a sewing machine having a frame includ
justing member having a peripheral notch, means
for adjusting the feed-drive eccentric of each of
said feeding mechanisms including two rock
shafts j ournaled in said frame, a locking arm car
ried by each of said rock-shafts and each hav
ing a portion designed to enter one of said
notches, means including a torsion spring acting
ing a work-supporting plate, a ?rst work-feeding 65 on one of said shafts to bias said shafts to a po
mechanism located beneath said plate and in
cluding a four-motioned feed-dog, a second work
sition in which said locking arms are out of lock
ing engagement with said adjusting members,
and a single manually actuable means for turn
feeding mechanism located above said plate and
ing said rock-shafts in opposition to said biasing
including an endwise reciprocable and laterally
movable needle, individual means for regulating 70 means to engage said locking arms with the
notches in said adjusting members. ,
the feeding action of each of said feeding mecha
nisms, and a single control means including a
manually shiftable lever for simultaneously and
synchronously controlling the action of both of
the feed regulating means.
8. In a sewing machine having a frame includ
ing a work-supporting plate, a ?rst rotary shaft
journaled in said frame above said plate, a sec
ond rotary shaft journaled in said frame beneath
75 said plate, ?rst and second adjustable eccentrics
8
manual‘means forturning‘one of said rock-Shafts
carried, respectively, by :said'flrsthand “second
thereby” to ‘render eifective both of said locking
‘shafts, a lower work-,feedingjmechanism ‘actuated -
from said second'shaft and'controlled'by said sec
ondadjustable eccentric, ‘an upper ‘work-‘feeding
mechanism ‘actuated fromm'said first ‘shaft and
controlled by said ‘?rst adjustable eccentric, ill
dividual locking members cooperating with each
of said adjustable eccentrics to vary theieccen
tricity thereof, and a ‘single manuallynactuable
element operatively‘rconnected to ‘actuate ‘both
of said locking members.
members.
i
r
..
t
r 10,. ‘In asewing machine having a frame in
cluding 1a work-supporting plate, a ?rst rotary
shaft‘journaled in ‘said frame above said plate, a
‘second rotary shaft journaled in said frame'b'e
neath said -plate,fa driving connection between
said shafts, ?rst and second adjustable eccentric
devices
carriedjrespectively, by said'?rst and sec
10
ond shafts, each of said eccentric devices com
9._ In a sewing machine ‘having a-frame includ
ing a work-supporting'platefa ?rst rotary shaft
'journaled in said frame above said plate, a sec
prising ‘amember normally rotated with its sup
porting shaft and an eccentric element associated
“with said member'and adapted to be shifted rel
ative thereto by relativev angular movement be
tween said member and its supporting shaft,
ond rotary shaft journaled in ‘said frame beneath
saidplate, ?rst and secend'adjustable eccentrics
thereby to vary the eccentricity of said eccentric
carried, respectively, by, said ?rst and second
element, an upperffeeding mechanism actuated
shafts, a lower work-feeding mechanism actuated
‘from said first shaft and controlled by said ?rst
from said second shaft and controlled by said
adjustable eccentric device, a lower work—fee'ding
second adjustable eccentric, an upper work-feed 20 mechanism actuated from said second shaft and
ing mechanism actuated from said ?rst shaft‘ and
controlled ‘by. said second adjustable eccentric
controlled by said ?rst adjustable eccentric, a
device, andme'ans controlled by a, single man
‘
for locking both of said
rock-shaft journaled in said frame adjacent and
(ually
iactuable element
parallel to said ?rst rotary shaft, a second rock
members'against
rotation
whereupon turning of
shaft journaled in said frame adjacent and par 25 one ofv said shafts e?ects simultaneous and syn
allel to ‘said second rotary shaft, an operative
chronous adjustment of both of said eccentric ele
connection between said rock-shafts, a locking
ments.
member carried by each of said rock-shafts and
with one i or said adjustable ec
‘each cooperating the eccentricity thereof, and
'centrics to vary
30
FRANK PARRY.
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