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Патент USA US2409244

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Oct. 15, 1946.
2,409,242
R. BECKER
WORK FEEDING MECHANISM FOR SEWINGv MACHINES
Filed' May 22, 1945
s. Sheets-Sheet '1
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15, 1946."
2,409,242
R. BECKER
WORK FEEDING MECHANISM FOR SEWING MACHINES
Filed May 22, 1945
3 Sheets-Sheet 2
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0a. 15, 1946.
R, BECKER '
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WORK FEEDING MECHANISM FOR SEWING MACHINES
I
2,409,242
2,409,242
Patented Get. 15, 1946
UNITED STATES PATENT OFFICE
2,409,242
WORK FEEDING MECHANISM FOR SEWING
MACHINES
Rudolph Becker, North Plain?eld, N. J., assignor
to The Singer Manufacturing Company, Eliza
beth, N. J ., a corporation of New Jersey
Application May 22, 1945, Serial No. 595,099
15 Claims. (Cl. 112-215)
1
This invention relates to sewing machines, and
more particularly to work-feeding mechanisms
for sewing machines of the heavy duty, multiple
needle type.
‘
-
The invention has as a primary object to pro
vide an unusually strong work-feeding mecha
nism, for heavy duty sewing machines, which is
positive in its action and rigid in construction so
that it will not be distorted under the heavy
stresses to which it is subjected during operation
of the machine,
Another object of the invention is to provide
a heavy duty feeding mechanism for sewing ma
chines in which both the power to lift the work~
feeding element and the power to give it its work
advancing movement are each applied at a plu
rality of spaced points, thereby avoiding distor
tion of the parts when under heavy stresses.
A further object of the invention is to provide,
2
bracket-arm, is a main or arm shaft 6 carrying,
at its rear end, a combined belt and hand wheel
‘I through which the shaft 6 is driven from any
suitable source of power,
' Mounted in the head 4, for endwise recipro
cation, are two needle-bars 8, each having ?xedly
secured to its lower end, a needle carrying block
9. Secured in and extending through the blocks
9 are two horizontally disposed rods l0 upon
which are adjustably secured a plurality of nee
dle-carrying blocks ll each similar to the blocks
9. Each of the blocks 9 and I I is adapted to carry
a needle N, only three of which are shown. Any
suitable number of blocks ll may be mounted
15 upon the rods ID and, by adjusting them along
the rods and securing them thereto, any desired
spacing of the needles and consequently any de
sired spacing of the seams formed thereby may
be obtained.
»
Cooperating with each of the needles, in the
in a dual actuated work-feeding mechanism, 20 formation of stitches, is a chain stitch looper L,
means for simultaneously and equally adjusting
also of which only three are shown. These loop
both of the feed actuating means.
ers may be of the thread-carrying variety or the
Still another object of the invention is to pro
non-thread-carrying variety dependent upon
vide, in a sewing machine work-feeding mecha
whether a two thread or single thread chain
25
nism, improved means for leveling or tilting the
stitch seam is desired. The loopers L are secured
feed-dog as may be desired.
in a looper-carrier l2 in proper position to co
With the above and other objects in view, as
operate with its complemental needle. The
will hereinafter appear, the invention comprises
looper-carrier, and the loopers carried thereby,
the devices, combinations and arrangements of
are given oscillatory and orbital movements from
parts hereinafter set forth and illustrated in the 30 a rotary feed- and looper-actuating shaft [3,
accompanying drawings of a preferred embodi
ment of the invention, from which the several
features of the invention and the advantages
attained thereby will be readily understood by
those skilled in the art.
In the drawings,
journaled in bearings H3 in the base, through
mechanism designated generally as w. Inasmuch
as the looper actuating mechanism forms no part
of the present invention, detailed illustration and
description thereof is deemed unnecessary.
The shaft I3 is rotated from the main shaft 6
through the medium of a one-to-one pulley and
ing machine embodying the present invention.
clip-belt drive, located in a vertically disposed
Fig. 2 is a horizontal sectional view taken sub
cavity 28* in the standard 2, and comprising a
stantially on the line 2—-2 of Fig. 1, with the 40 grooved pulley 6“ on the shaft 6, a similar pulley
various cover-plates omitted.
13*‘ on the shaft l3 and a clip-belt 6*’ connecting
Fig. 1 is a front elevation of a heavy duty sew
Fig. 3 is a transverse vertical sectional view
I those pulleys,
taken substantially on the line 3-3 of Fig. 2.
The needle-bars 8, and the needles carried
Fig. 4 is a transverse sectional view taken sub
thereby, are given endwise reciprocations from
45
stantially on the line 4-4 of Fig. 2.
the arm shaft 6 through mechanism designated
Fig. 5 is a view similar to Fig. 3, but with cer
generally as y, and. in timed relation with the
tain parts omitted and showing, in full and dotted
lines, parts of the feeding mechanism in two posi
tions of adjustment.
Referring more speci?cally to the drawings, the
invention is disclosed as embodied in a sewing
machine having a frame comprising a pan-like
bed or base I, a standard 2 and an overhanging
movements of the loopers.
Secured upon the upper side of the bed I are
suitable cover-plates Ia and a work-supporting
throatpplate lb having therein slots l5 through
‘ which operate the sections of a feed-dog l6 of a
lower four-motioned work-feeding mechanism
hereinafter to be described. During the time that
bracket-arm 3 terminating in a bracket-arm head
4. Journaled in bearings 5, lengthwise of the 55 the feed-dog is below the upper face of the
9
2,409,242
4
a)
throat~plate, the work is held on the throat-plate
by two presser-feet I‘! each secured upon the
lower end of a spring-depressed presser-bar |‘|a
mounted in the head 4. When the feed-dogs are
above the upper surface of the throat-plate, dur
ing a Work-feeding movement, the presser-feet
yieldingly bear upon the work and therefore co
operate with the feed-dog in the feeding of the
work.
frame I8, thereby giving to the feed-dog I6 its
feed and return movements.
The amplitude of
the feed and return movements, and thus the
length of stitch produced by the machine, is de
termined by the setting of the blocks 35 on the
ribs 34‘1 nearer to or farther from the axis of
oscillation of the shafts 23 and 24; the farther
the blocks are adjusted from the axis of oscilla
tion, the greater will be the movement trans
The overall spacing of the outside needles is 10 mitted to the feed-dog, and vice versa. Stop
relatively great and, as the pre'sser-feet and feed;
screws 38 threaded into the upper ends of the
dog must be greater in width than the overall
ribs 34a have their heads projecting beyond the
spacing of the needles, it follows that the presser
sides of the ribs and therefore afford abutments
feet and feed-dog also are of considerable width.
‘to ‘prevent the blocks from being slid off the up
This, together with the fact that the machine is
per ends of ‘the ribs. Similar stop-screws 39 are
designed for use on heavy materials, necessitates
provided at the lower ends of the ribs.
that a relatively heavy spring pressure be applied
Likewise, dual means is provided for giving to
to the presser-feet to insure proper feeding of
the feed-frame, and the feed-dog carried there
the work. During the feeding stroke this pres- '
sure is transmitted directly to the feed-dog and
thereby to the feed-bar or frame which carries
the feed-dog.
The present improved work-feeding mecha
nism includes the feed-dog I6 and a horizontally
disposed substantially U-shaped feed-frame I8
comprising two slide-bars I9, ~to the forward ends
of which the feed-dog I6 is secured, and a ‘cross
bar 20 to which the rear ‘ends of the'slide-bars
I9 (are connected. The feed-frame ‘I8 is slidingly
mounted On two horizontally disposed guide-bars
~2| pivotally connected, at 22, to the bed of the
‘machine. The feed-frame is reciprocated on its
guide-bars by two independent drives comprising
two aligned rock-shafts ‘23 and 24 journaled, re
spectively, in bearings 25 ‘and 26, 26’ in the ma
chine base.
' The rock-shaft 24 is oscillated from a feed
drive eccentric 3| on the rotary feed ‘and looper
actuating shaft I3 through the medium of a pit
man 32 having one end surrounding the eccentric
-3| and its vother ‘end connected, at 29, to the
upper endofa rock-arm 33 ?xed to the shaft 24.
(See Figs. 2 and 4.) The rock-shaft'23 is simi
larly oscillated from an eccentric 21 on the shaft
I3 through a pitman 28 connecting the eccentric
with the upper end‘of 'a rock-arm 30 ‘secured upon
the shaft 23.
The'eccentri-cs ‘27, 3|, pitmans 28, 32 and the
rock-arms 39, 33 are identical and therefore the
rock-shafts 23, 24 are oscillated synchronously
from the shaft ‘I 3.
» Each rock-shaft 23, 24 is provided with a feed_
rocker in the form of an upstanding segmental
arm 34 having a projecting ‘rib 34‘1 upon "each of
which is adjustably ?tted a grooved slide-block
35 adapted to be held in adjusted position by a
set screw 36 threaded through the block 35 and
bearing against the ‘side of the rib 34“. Each
slide-block 35 carries a laterally projecting stud
353 which ?ts into a bore 37aL formed in the hori
zontal tubular end portion 3‘!‘1 of a link 31, the
other end portion of which is pivotally connected
to the feed-frame I3. A coil spring 31*, ‘?tted
within the bore 31“, bears against the ends of
by, their rising and falling movements in timed
relation with their feed and return strokes. This
means comprises a feed-lift rock-shaft 40 jour
naled in bearings 4| in the bed I; 'a‘pair of feed
lift rock-arms 42 having their split hubs secured,
by clamp screws 42*, upon the shaft 40; ‘arms 43
secured upon the guide-bars 2|; and links 44
pivotally connected, at 43“, to one end of the arms
43 and at their other ends to the rock-arms 42.
Thus ‘oscillations of the shaft 46 transmit, at two
widely spaced points, rising and falling move
ments to the guide-bars 2| and thereby to the
feed-frame I8 and the feed-dog I6.
oscillatory movements are transmitted to the
shaft '43 from an eccentric 45 on the rotary shaft
l3. This eccentric is surrounded by a strap 46
carrying a sleeve 41 in which ‘is slidingly ?tted
a pin 48, projecting from a pinch collar '49, se
cured upon the'shaft 40.
To enable ‘tilting ‘or leveling ‘of the feed-dog
It‘ as may be desired-means is provided for tip
ping the -feed-frame I8 as indicated in dotted
lines in Fig. 5. This is effected by forming each
of the guide-bars 2| in two pieces, viz. a cylin
drical forward portion 2|a on which the feed
frame is slidingly mounted and a rearward or
anchor portion 2|b which is pivotally connected
at 22 to the bed of the machine. The portions
Zia and 12|b are rigidly secured together by a
c1ampboltl50.
When it is desired to vary the angular posi
tion-of the >feed~dog, the clamp bolts 50 are loos
ened, after which the feed-frame I8, and the
feed-dog carried thereby, may be tipped about the
pivotal axis 43a between the arm 43 and link 44;
‘the portions '2 |b of the guide-rods 2| turning
about their pivots 22 and the bolts 50 acting as
hinge pins. After the desired adjustment has
been effected, the bolts 50 are again tightened to
maintain vthe parts in their adjusted positions.
From the foregoing, it will be perceived that
very strong and rigid dual drives are provided be
tween the shaft I3 and the feed-‘frame I8, for
giving to the feed-dog its rising-and-falling and
feed-and-return strokes and that, inasmuch as
those drives are transmitted to ‘the feed-frame
the studs 35a and urges the slide-blocks 35 into - r
at a plurality of spaced points, the feed-frame and
frictional contact with the ribs 34a of the feed
the feed-dog carried thereby will be held against
rockers 34, when the screws 36 are released. For
deflection or distortion by ‘the stresses applied
convenience of manufacture, and to insure simul
thereto.
taneous adjustment, the link connections between
It will also be apparent that ‘a sing'le‘means (the
the studs 3511 and the feed-frame I8 are prefer- ’ ‘
simultaneous adjustment of the link 31 on both
ably combined into a single link 31, forked as at
segmental arms 34) has been provided for simul
37b, and providing sleeves 37° pivotally connected,
taneously varying the feed and return stroke
at spaced points, to the cross-bar 20 of the feed—
transmitted to the feed-dog by the two feed
frame. Thus oscillations of the rock-shafts 23,
driving mechanisms.
24 are translated into reciprocations in the feed—
~ It is to'be understood that the above described
523095242
6
feeding mechanism may be usedeither ‘separately
said rotary shaft, a driving connection between
spaced and coaxially ,journaled feed-rockers, a
driving connection between each of said feed
said rock-shafts, and a link pivotally connected
to‘ said feed-frame and adjustably connected to
each ref-said feed-drive elements and one of said
or in conjunction with a suitable upper feeding
rock-shafts,i.a rock-arm on each of said rock
mechanism such, for example, as'that disclosed
shafts,‘ and a single link connection between said
'in my United States ‘patent, application Serial No.
rock-arms“ and said feed-frame.
603,656, filed Ju1y'7, 1945, as an upper and under
'1.» A work-feeding mechanism for sewingma
or “clamp” feeding mechanism. Portions of said
chines comprising a U-shaped feed-frame, a feed
upper feeding mechanism are shown in Figs. 1
dog carried bysaid feed-frame, a rotary shaft
and 3 and are. designated generally as it.
locatedbelow said feed-frame and extending to
Having thus set forth the nature of the inven
10 opposite sides thereof, a feed-drive eccentric car,
tion, what I claim herein is:
ried by said shaft at each side of said feed-frame,
1. A work-feeding mechanism for sewing ma
two. aligned rock-shafts located rearwardly‘ of
chines comprising a feed-frame, a feed-dog car
said rotary shaft, a driving connection between
ried by said feed-frame, a rotary shaft, two feed
each of said feed-drive eccentrics and one of said
vdrive elements carried by said shaft, two laterally
15 rock-shafts, a segmental rock-arm on each of
.drive elements ‘and a respectivev one of said feed
of said rock-arms.
rockers, and adriving connection between each ‘ both
8. A work-feeding mechanism for sewingma
of said feed-rockers and said feed-frame for im
chines comprising a U-shaped feed-frame includ
parting work-advancing movements to said feed 20 ing
spaced slide-bars and a cross-bar connecting
said slideebars, afeed-dog carried by the free
2.>A work~feeding mechanism for sewing ma
end of , said feed-frame, a rotary shaft located
chines comprising afeed-frame, a feed-dog car
below said feed-frame and‘ extending to opposite
,ried by said feed—frame,.,a rotary shaft, two feed
sides thereof, a feed-drive element carried by
drive elements carried by said shaft, two laterally 25 said shaft at each side of said feed-frame, two
spaced and coaxially journaled feed-rockers, a
aligned rock-shafts located rearwardly of said
driving connection between each of said feed
rotary shaft, a driving connection between each
drive elements and a respective one of said feed
of said feed-drive elements and one of said rock
fr'ockers, a driving connection between each of said
shafts, a segmental rock-arm on each of said
ffeed-rockers'andi said feedéfr'am'e for imparting
rock-shafts, a slide-block adjustably mounted on
work-advancing movements to saidifeed-dog, and
each of .said rock-arms, a link pivotally connected
means for _simultaneously and equally adjusting
dog.
'
'
the driving connections between both of said feed
rockers and said feed-frame, thereby to vary the
feeding stroke transmitted to the feed-dog.
3. A work-feeding mechanism for sewing ma
chines comprising a feed-frame, a feed-dog car
ried by said feed-frame, a rotary shaft, means
"at one end to thecrossebar of said feed-frame
and at its opposite end to said slide blocks, and
means to raise and lower said feed-frame and the
feed-dog carried thereby.
9. In a sewing machine having a base and a
rotary shaft journaled in said base; a pair of
horizontally spaced guide-bars secured at one end
actuated by said shaft for imparting rising and
to said base, a feed-frame slidingly mounted on
falling movements to said feed-frame and the 40 said guide-bars, a feed-dog carried by said feed
feed-dog carried thereby, two feed-drive ele
frame, two aligned rock-shafts journaled in said
ments carried by said shaft, two laterally spaced
base rearwardly of said rotary shaft, individual
and coaxially journaled feed-rockers, a driving
means for oscillating each of said rock-shafts
connection between each of said feed-drive ele
from said rotary shaft, a rock-arm on each of
45
ments and a respective one of said feed-rockers,
said rock-shafts, and a driving connection from
and a single link connection between both of said
each of said rock-arms to said feed-frame to
feed-rockers and said feed-frame for imparting
reciprocate said frame on said guide-bars.
work-advancing movements to said feed-dog.
10. In a sewing machine having a base and a
4. A work-feeding mechanism for sewing ma
rotary shaft journaled in said base; a pair of
chines comprising a feed-frame, a feed-dog car- ,,
spaced guide~bars secured at one end to said base,
ried by said feed-frame, a rotary shaft, two feed
a feed-frame slidingly mounted on said guide
drive elements carried by said shaft, two aligned
bars, a feed-dog carried by said feed-frame, two
rock-shafts located rearwardly of said rotary
aligned rock-shafts journaled in said base, indi
shaft, a driving connection between each of said
vidual means for oscillating each of said rock
feed-drive elements and a respective one of said
shafts from said rotary shaft, and means actu
rock-shafts, a rock-arm on each of said rock
ated by each of said rock-shafts for reciprocating
shafts, and a driving connection between each of
said feed-frame on said guide-bars.
said rock-arms and said feed-frame.
11. In a sewing machine having a base and a
5. A work-feeding mechanism for sewing ma
rotary
shaft journaled in said base; a pair of
chines comprising a feed-frame, a feed-dog car 60 spaced guide-bars pivotally secured at one end to
ried by said feed-frame, a rotary shaft located
said base, a feed-frame slidingly mounted on said
below said feed-frame and extending to opposite
guide-bars, a feed-dog carried by said feed-frame,
sides thereof, a feed-drive element carried by
two aligned rock-shafts journaled in said base,
said shaft at each side of said feed-frame, two
individual means for oscillating each of said rock
aligned rock-shafts located rearwardly of said 65 shafts from said rotary shaft, means actuated by
rotary shaft, a driving connection between each
each of said rock-shafts for reciprocating said
of said feed-drive elements and one of said rock
feed-frame on said guide-bars, and means to ad
shafts, a rock-arm on each of said rock-shafts,
just the position of said guide-bars thereby to
and an adjustable driving connection between
70 vary the position of said feed-frame and feed-dog.
each of said rock-arms and said feed-frame.
12. In a sewing machine having a frame in
6. A work-feeding mechanism for sewing ma
cluding a Work-support and a rotary shaft jour
chines comprising a U-shaped feed-frame, a feed
naled below said work-support; a guide-bar com
dog carried by said feed-frame, a rotary shaft,
L prising two adjustably connected parts of which
,two feed-drive eccentrics carried by said shaft,
one part is journaled on a ?xed pivot carried by
two aligned rock-shafts located rearwardly of 75
2,409,242
said ‘frame, a reed-frame slidingly mounted on
the other partiof said ‘guideebar, a ‘work-advanc
ing feed-dog carried vby said feed-frame, :m'eans
actuated by said shaftifor reciprocatingssaid feed
frame on said guide-bar, "and means to adjust the
angle between the two parts of said guide-bar,
thereby to vary the ‘position of said reed-frame
and feed-dog relative to Ithefwork-support.
13. In a sewing machine having a lbase'and a
shaft, a ‘rock-arm on each or .said rock-shafts,
a driving/connection ‘between each of said rock
arms and said feed-frame to ‘reciprocate ‘said
feed-frame and the feed-dog'carriedthereby, and
individual 'means actuated by said oscillatory
shaftand connected ‘with said feed-frame adja
cent opposite sides thereof to give to said feed
frame rising ‘and falling movements.
15. In a sewing machine having a base, a rotary
rotary shaft journaled in said base‘; a pair?of 10 shaft journaled therein, an oscillatory shaft jour
spaced guide-bars ipivotally secured at one end
naled in said base ‘parallel to said'rotary shaft,
to ‘said base, each of said guidehbars “including
a pair of rock-arms on said oscillatory shaft, and
an anchor section and a slide section and-means
means for actuating said oscillatory shaft from
securing said sections together, a feed-frame
said rotary shaft; a pair of parallel guide-bars
"slidingly mounted on the ‘slide sections of said
each having one ‘end pivoted to-said base, a U
‘guide-bars, a‘feed-dogcarried by said feed-frame,
two aligned rock-shafts journaled in said base,
individual means for oscillating each 'o'fis‘a'id rock
shafts from said ‘rotary shaft, Imeans actuated
shaped feed-frame overlying said shafts and slid-_
ingly mounted on said guide-bars, a feed-dog
carried by the free end of said feed-frame, two
aligned rock-shafts journaled in said base, indi
‘by each of said rock-shafts for‘reciprocating said 20 vidual means for oscillating each of ‘said rock
feed-frame on said 'guide-bars,and means to vary
the angle betweenthe two sections of each guide
bar thereby to vary the ‘position of said feed
frame and feed-dog relative to a ‘horizontal‘plane.
131. 'In ‘a sewing machine having a base, ~a rotary
shaft journaled in said base, an oscillatory shaft
journaled in said base parallel to said rotary
shaft, and means for actuating said oscillatory
‘shaft from ‘said rotary Jsha'ft'; la 'slidingly mounted
vfeed-frame overlyingis‘a'id shafts, “a feed-dog car
ried by ‘said feed-‘frame, two Jaligned'rock-shafts
'j'ournaled ‘in ~said base,!indivi'dual meansfor oscil
lating each of saidirock-shafts from said rotary
shafts from said rotary shaft, a rock-arm on each
of said rock-shafts, a driving connectioni'between
each of said rock-arms and said feed-{frame to
reciprocate said feed-frame and the feed-dog
carried thereby, Jinks pivotally connecting ‘said
.pair of rock-arms with said feed-frame to give to
said feed-frame rising and falling movements,
and means for adjusting said feed-frame angu
larly about the pivotal connection between ‘said
links and said feed-frame to vary the position of
said feed-dog.
RUDOLPH BECKER.
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