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Патент USA US3031999

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May 1, 1962
w. ENGEL ET AL
3,031,989
SEWING MACHINE WITH RING SUPPORTED BOBBIN
Filed Aug. 5, 1958
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Inventors
May 1, 1962
3,031,989
w. ENGEL ET AL
SEWING MACHINE WITH RING SUPPORTED BOBBIN
Filed Aug. 5, 1958
5 Sheets-Sheet 2
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Inventors
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May 1, 1962
w. ENGEL ET AL
3,031,989
SEWING MACHINE WITH RING SUPPORTED BOBBIN
Filed Aug. 5, 1958
5 Sheets-Sheet 5
May 1, 1962
w. ENGEL ET AL
3,031,989
SEWING MACHINE WITH RING SUPPORTED BOBBIN
Filed Aug. 5, 1958
5 Sheets-Sheet 4
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May 1, 1962
w. ENGEL ET AL
3,031,989
SEWING MACHINE WITH RING SUPPORTED BOBBIN
Filed Aug. 5, 1958
r
5 Sheets-Sheet 5
United States Patent 0 "ice
3,031,989
Patented May 1, 1962
2
1
The illustrated arrangement for the latching as well
as for the opening and closing operation of the material
3,031,989
feed plate also in combination with the arrangement for
raising and lowering the feed dog may, in accordance
SEWING MACHINE WITH RING
SUPPORTED BOBBIN
Wolfgang Engel, Bielefeld, and Hans Baumotte, Brack
wede, Germany, assignors to Anker-Phoenix Nah
5 with the invention, also be provided on such free arm
. machines having a housing closure ?ap.
maschinen Aktiengesellschaft, Bielefeld, Germany
Filed Aug. 5, 1958, Ser. No. 758,637
Further details of the invention will become apparent
from the embodiments illustrated in the drawings in
(Filed under ‘Rule 47(2) and '35 U.S.C. 116)
which:
5 Claims. (Cl. 112-180)
FIG. 1 is a bottom view of the sewing machine showing
10
the driving gear,
The invention relates to a sewing machine of the type
FIG. 2 is a section taken along line II—-II in FIG. 1
having a ring supported bobbin which cooperates with
in the direction of the arrows,
the looper in which for the purpose of removing the
FIG. 3 is a section long line III-III of FIG. 1 taken
in
the direction of the arrows,
15
material feed dog must be opened. > In such a machine
FIG. 4 is a section along line IV—IV of FIG. 1 with
the removing and particularly also the insertion of the
bobbin casing for exchanging the bobbin in an aperture I the ring support closed seen in the direction of the arrows,
FIG. 5 is a section along line IV—IV of FIG. 1 with
in the frame presents particular di?iculties. With the
bobbin casing the housing portion or plate adjacent the
the ring support open taken in the direction of the arrows,
feed dog closure open one is compelled to reach into
the interior of the material carrying plate ahead of the 20 FIG. 6 is a plan view of the sewing machine base plate
indicating the locations for the lowering of the material
looper frame in order to release the latching of this
feed
dog and for opening the ring support,
bobbin supporting ring.
.
FIG. 7 is afront view of the free arm with its driving
It is an object of the invention to simplify this rather
gear components and the feed dog lowering mechanism,
cumbersome operation in a ?at bed as well as in a free
25
arm machine.
FIG. 8 is a top view upon the free arm showing the
driving gear and the feed dog lowering means with the
‘In accordance with the invention this object is achieved
cover removed,
_
in that ‘the. material feed plate or housing closure is
FIG. 9 is a section along the line IX—IX in accord
coupled with the bobbin ring in such a manner that during
ance with FIGS. 7 and 8 taken in the direction of the
opening or closing the material feed plate or other closure
the bobbin ring is automatically brought into the position 30 arrows,
FIG. 10 is a section along line X—X in FIGS. 7 and
8 taken in the direction of the arrows,
FIGS. 11 is an end view of the free arm in accord-.
a manner that the free end of the bobbin ring frame is
ance with FIG. 7 looking in the direction of the arrow
linked with the material feed plate. If the material feed
plate or housing closure is then moved downwardly with 35 with the free arm closure lid latched, and
FIG. 12 is a view of the free arm seen in the direction
its inner end, the ring support is simultaneously opened
of the arrow with the free arm closure open.
and the bobbin housing is disposed in a position to be
The belt pulley of the arm shaft which is not illus
readily picked up by the seamtress.
trated and which is secured upon the main drive shaft
For this purpose the ring frame and the material feed
plate can be biased as a unit by means of a spring 40 of the sewing machine drives intermediate shaft 2
for sewing.
_
This operation can be etfected, for example, in such
which aids in the opening operation of the housing
closure or the material feed plate. If in the sewing posi
mounted in the base 1" through the standard 1' by way
sewing position of the ring support which is movable by
guide block 10 (FIG. 2). The forked lever 11 which is
feed dog.
dimension and direction is varied by way of the connect
of belt pulley 3 and belt 3’ at a ratio of 1:1.
A worm gear ‘4 is mounted at the left front end of
tion of the ring frame in the flat bed machine the link
the
intermediate shaft 2 having a corresponding gear 5
which connects the material feed plate and the ring sup
port and the pivot pin for the material feed plate are dis 45 which is mounted upon the transversely disposed looper
shaft 6 and which. drives at its front end the looper 7
posed approximately at right angles, then the uninten
at a ratio 2:1. The looper shaft 6 is carried at its rear
tional opening of the material feed plate as a result of
end in the bearing sleeve 6’ which is mounted in the
pressure upon the plate is avoided.
base '1". The base 1" is provided with a cover plate
The unintentional opening of the material feed plate
and thus also the unintentional opening of the ring sup 50 1"’ for reasons of manufacturing convenience.
The thrust for the feed dog 8 (FIGS. 3 and 4) is pro
port may furthermore be prevented in that the ring sup
duced by means of a cam 9 mounted upon intermediate
port is provided with a latch having a lever. Ahead of
shaft 2 which cam cooperates with an adjustable grooved
this latching lever a locking lever will be disposed in the ‘
means of a manipulating device which can be operated 55 connected to the slide and reaches around cam 9 is pro
. vided on one side with the stud 12 which carries the sliding
from the exterior.
member 13 which moves in the grooved block 10. The
In order to enable use of the sewing machine for normal
other end of the forked lever 11 is linked to the stud 14
sewing operations as well as for embroidery or mending
which is secured in the crank 15 which transmits the
operations it is customary to arrange the material feed
dog in a manner that it can be lowered. For this pur 60 movement of the forked lever 11 to the feed shaft 17
mounted in the base 1" by means of pintles 16 and 16’.
pose known machines are provided with a manipulating
means which is connected by way of suitable linkage '- The movement of the feed shaft 17 is transmitted by way
of crank 18 to the feed bar 19 at the forward end of the
means to the material feed dog. In accordance with the
base 1" and the material feed dog 8 is secured to the
invention the manipulating means which is provided in
a ?at bed machine for the latching as well as for the 65 forward end of said feed bar. By means of the operat_—
ing handle 20 journalled in the standard 1' the position
opening ' and the closing operation is simultaneously
of the grooved member 10 and thus the material feed
utilized for the raising and the lowering of the material
ing bar 21 and the crank 22 secured upon the stud 12 in
In free arm machines material feed plates are not
known. Instead the free arm is provided with a housing 70 the grooved block 10 (see FIG. 2)‘.
closure lid which is adapted to carry also the ring for the
ring looper along its inner wall.
The thrust of the feed dog 8 is produced by means of
a cam 24 upon the intermediate shaft 2 (see FIG. 3)“.
3,031,989
4
The connecting bar 23 engages the cam 24 at one end.
The connecting bar is linked at its other end to the one
arm 25’ of the angular lever 25 in the base 1". The jaws
19' of the feed bar 19 engage the shaft 26 which is
mounted for axial displacement on the other end of the
lever arm 25” of the angular lever 25 (see FIG. 6).
The lowering of the feed dog 8 is effected by a setting
knob 27 journalled in the rear portion of the base 1".
Its shaft 27’ guided in the base 1” carries a crank 28 to
which is linked one end of the draw bar 29 while the 10
sleeves 56' and 56" in the free arm 51. At the left front
end of the intermediate shaft 56 a warm gear 57 is
provided which in turn meshes with teeth of the coop
crating gear 58 provided upon looper shaft 59 thus insur
ing the drive at a ratio of 1:1 with respect to looper 60.
The thrust for the material feed bar 61 is produced by
means of a cam 62 secured to drive shaft 52 in combina
tion with the adjustable grooved block 63 (see FIGS. 8
and 9). At the closed jaw lever 64 which engages cam
62, a bolt 65 is riveted on one side which carries the slide
other end is linked by means of an eyelet 29’ to the cen
member 66 which slides in the grooved block 63.
tral part of a lever 36 which is secured by means of
other end of the closed jaw lever 64 is linked to the bolt
The
screw 30’ to the base 1". An elongated slot 30” is'pro
67 which is secured to the crank 68 (see FIG. 9). The
vided in the fore part of the lever 30 which is engaged
crank 68 is fastened upon feeding shaft 71 by means of the
by a pin 31 of the shaft 26. By rotating the setting knob 15 collar screw 68' and transmits the movement of the closed
27 to the position III indicated in dotted lines, the draw
jaw lever 64 to the feed bar 71 provided in the free arm
bar 29 ‘by way of crank 28, the lever 30 and the pin
51 and journalled on pintles 69 and 70 which at the for
31 withdraws the shaft 26 from the jaws 19' of the feed
ward end of the free arm 51 support crank arms 72 and
bar 19. Thus the path for lowering the feed bar 19 with
73 in which the. pintles 74 and 75 are journalled. These
the feed dog secured thereto is freed. By rotating the 20 conical pintles 74 and 75 support the feed bar 76 sus
setting knob 27 into the position II, indicated in dotted
pended therebetween and upon the forward end of which
lines, the shaft 26 is pushed back by spring 39 over lever
is secured the feed dog 61 by means of the two collar
30 into the jaws 19' of the feed bar 19 and the thrust
screws 77 and 78. By shifting the manipulating handle
movement of the angular lever 25 is again transmitted to
79 journalled externally of the base 51" upwardly or down
the feed bar 19.
25 wardly in the base 51' the movement is transferred by way
The looper 7 upon the looper shaft 6 in its course, en
of connecting bar 80 and the crank 83 secured to the
gages the bobbin housing 7’, which is held in its posi
extended. stud 63’ (FIG. 8), of the slide block 63 to the
tion by a ring 32' in the ring support 32. The ring sup
feed dog 61 and determines the magnitude and direction
port 32 carries a pivot support such as ?xed bolt 33 at
of feed in relation to the position of the grooved block
its lower end which is journalled in the base 1” in bear~ 30 63.
ings 33' and 33" at right angles with respect to the looper
The stroke of the feed dog 61 is likewise produced by
shaft 6. Bolt 33 carries at its right end a lever 34 which
a cam 82 which is axially displaceable upon the single
can be secured in position by means of screw 34' and
rotation drive shaft 52 (FIGS. 8 and 10). By means of
which at its. upper end engages lever 30 when the looper
a slide member 84 adjustably secured by means of a
ring is in closed position (see FIG. 5 dotted lines). By 35 screw ‘83 upon the forward portion of the feed bar 76,
rotating the setting knob 27 into position I the lever 30
the feed bar 76 is supported upon cam 82 and is held
is shifted in the direction towards the looper 7 by way of
in position upon cam 82 by a tension spring 85 suspended
draw bar 29 and with the lever 34 on the shaft 33 re
on the pin 85' in the free arm 51. The lowering of the
leased the ring on the frame is drawn down by means of ' feed dog 61 below the stitch plate 61' is effected by a
tension spring 35 to the abutment 36 which is secured to 40 setting knob 86 which is accessible from the exterior and
the base 1" by means of screws 36' and 36". The
closure slide or feed plate 37 which is linked to the upper
end of the ring support 32 by hinge means in the form of
pin 35’ is simultaneously shifted along a longitudinal slot
mounted on ‘the rear portion of the free arm 51. The
crank 90 is secured upon the shaft 88 by means of screw
89 journalled in the sleeve 87 in free arm 51. In the
lower part of the crank 90 the pin 92 which is provided
38' about the bolt 38 mounted in the base 1" in the direc 45 with a screw 91 is secured which with its projecting por
tion of the arrow A shown in FIG. 5. The ring 32' is
tion 92' engages the groove 93' of the disk 93 which is
now opened and thus free for exchanging the bobbin. The
secured upon a draw bar 94 by means of a screw 94'
closing of the ring 32’ is effected by the pressure upon
which through a drive shaft 52 in the form of a hollow
the outer edge of the closure slide or feed plate 37 in
shaft leads forward to the displaceable stroke cam 82.
the direction of the arrow B thereby moving the feed plate 60 The cam 82 is secured by means of a cylindrical pin 95
to the horizontal position upon the cover plate 1”’ which
to the draw bar 94 in the forward end of the stroke cam
closes the base 1". In this position the lever 30 is shifted
82 which secures the stroke cam 82 against rotation and
by means of spring 39' in front of lever 34 which holds
simultaneously is movable in the longitudinal slot 52'
the ring frame 32 in closed position upon the common
of the drive shaft 53-. By rotating the setting knob 86
shaft 33. The base 1’ is advantageously provided with 55 into position III to the right, the cam 82 upon shaft 52
a closure plate 40, the lower four corners of which are
is shifted to the left towards the looper v60 by way of
provided with rubber feet 41 to thus secure the upper part
the crank 90, pin 92, disk 93, draw bar 94 and cylinder
of the machine against sliding and also to protect the
pin 95.
operating components provided in the interior against
The sliding member 84 comes to rest upon the cylindri
soiling, or also to collect any oil which might drop down. 60 cal portion 82’ of the cam 82 which is smaller in di
The arrangements described hereinabove, the opening
ameter and permits the feed dog 61 to, sink below the
of the, ring frame 32 by means of a manipulating member
stitch plate 61'. By turning back the setting knob 86
into’ position II (center) the cam 82 together with its
Hereinafter an embodiment is, described with reference 65 eccentric portion 82 is withdrawn below the slide‘ mem
ber 84 and the draw bar 76 is again ‘brought in operative
to FIGS. 7-12 which relates to free arm sewing machines.
engagement'with the feed .dog- 61.
The drive shaft 52 journalled in free arm 51 is driven by
The transversely disposed shaft 59 carries at its for
way of a pulley upon the arm shaft (not shown) by
ward end looper 68 which in its path of operation receives
way of a second belt pulley 53 and the belt 53' at a
ratio 1:1. A worm gear 54 which is secured upon drive 70 the bobbin shell 60,’ which is held in its position by means
shaft 52 meshes with a cooperating gear 55. The latter
of ring 96. The ring 96 is secured in the housing lid 99
is provided upon the intermediate shaft 51 by means of
by means of its stud 97 and screwv 98 which lid is pivot
screws and provides for the transmission to the transverse
ally connected in free arm 51 by means of pin 100. The
1y disposed looper shaft 59 at a ratio 2:1. The inter
nose 101 of the, sliding member 102 mounted in free
mediate shaft 56 is journalled at two ends in the bearing 75 arm 51 by means of sleeve 105 engages the catch i104
provided externally of the upper part of the machine re
late to ?atbed machines.
3,031,989
5
secured in the housing lid 99 by means of screws 103 and
103’ and thus keeps the housing lid 99 closed.
By rotating the setting knob 86 into position I toward
the left the cam 82 is moved toward, the right of the
looper 60 by way of the aforementioned mechanism and
the central part 82' of the cam 82 in combination
with the pin 108 secured in the slide 102 is pushed away
from the looper 60. The nose 101 of the slide frees the
dog and a ring support carrying said bobbin supporting
ring, said ring support being connected at one end to
said pivot support and at the other end to said hinge
means and being movable with said supporting ring and
by means of said feed plate relative to said looper, said
feed plate being pivotally supported and slidable on the
machine housing for tilting movement, and said ring sup
port being movable into inclined position in alignment
with said feed plate, a guide pin for said feed plate being
catch 104 and thus the housing lid 99 which is automati
mounted in said housing and a pair of slotted guide mem
cally opened under the pressure of the bolt .106 against 10 bers being disposed below said feed plate and slidable on
spring 107 upon receding part 99’ of the housing lid 99.
said guide pin.
The closing of ‘the housing lid and thus simultaneously
4. In a sewing machine of the type having a housing,
of the ring 96 secured therein is effected manually until
and including a drive shaft supported in said housing, a
the nose ‘101 of the slide 102 again snaps behind the catch
15 feed "bar comprising a feed dog supported in said hous
104 under the pressure of spring 109.
ing, a feed plate extending in closed condition in align
We claim:
1. In a sewing machine of the type having a housing,
and including a drive shaft suported in said housing, a
ment with said feed dog, a ring looper, a bobbin, a ring
tiltably supporting said bobbin proximate said looper
for cooperation therewith, a rotatable shaft extending
feed bar comprising a feed dog supported in said housing,
transversely of said housing and supporting said looper
a feed plate extending in closed condition in alignment 20 proximate said feed dog for rotation about its axis in
with said feed dog, a ring looper, a bobbin, a ring tilt
?xed position relative to said feed plate, and further in
ably supporting said bobbing proximate said looper for
cluding driving gear for said feed bar and for said rotat
cooperation therewith, a rotatable shaft extending trans
able shaft and said looper operatively connected to said
versely of said housing and supporting said looper proxi
drive shaft; a pivot support disposed below said looper,
25
mate said feed dog for rotation about its axis in ?xed posi
hinge means provided at the end of said feed plate ad
tion relative to said feed plate, and further including driv
jacent said feed dog and a ring support carrying said
ing gear for said feed bar and for said rotatable shaft and
bobbin supporting ring, said ring support being connected
said looper operatively connected to said drive shaft; a
at one end to said pivot support and at the other end
pivot suport disposed below said looper, hinge means pro
to said hinge means and being movable with said support
vided at the end of said feed plate adjacent said feed dog 30 ing ring and by means of said feed plate relative to said
and a ring support carrying said bobbin supporting ring,
looper, said feed plate being pivotally supported and slid
said ring support being connected at one end to said
able on the machine housing for tilting movement, and
pivot support and at the other end to said hinge means
said ring support being movable into inclined position in
and being movable with said supporting ring and by
35 alignment with said feed plate, a guide pin for said feed
means of said feed plate relative to said looper.
plate being mounted in said housing and a pair of slotted
2. In a sewing machine of the type having a housing,
guide members being disposed below said feed plate and
and including a drive shaft suported in said housing, a
slidable on said guide pin and an abutment being disposed
feed bar comprising a feed dog supported in said housing,
in said housing below said feed plate for engagement by
a feed plate extending in closed condition in alignment
said ring support and said feed plate in said aligned posi
with said feed dog, a ring looper, a bobbin, a ring tilt 40 tion, and a spring being secured at one end to said housing
ably supporting said bobbin proximate said looper for
and at the other end to the joint between said ring sup
cooperation therewith, a rotatable shaft extending trans
port and said feed plate for biasing said support and
versely of said housing and supporting said looper proxi
mate said feed dog for rotation about its axis in ?xed
said plate downwardly.
5. In a sewing machine of the type having a housing,
position relative to said feed plate, and further including 45 and including a drive shaft supported longitudinally of
driving gear for said feed bar and for said rotatable shaft
said housing, a feed bar supporting a feed dog and ex
and said looper operatively connected to said drive shaft;
tending transversely of said housing, a feed plate extend
a pivot support disposed below said looper, hinge means
ing in closed condition in alignment with said feed dog,
provided at the end of said feed plate adjacent said feed
a ring looper, a bobbin, a ring tiltably supporting said
dog and a ring support carrying said bobbin supporting 50 bobbin proximate said looper for cooperation therewith,
ring, said ring support being connected at one end to
a rotatable shaft extending transversely of said housing
said pivot support and at the other end to said hinge
and supporting said looper proximate said feed dog for
means and being movable with said supporting ring and
rotation about its axis in ?xed position relative to said
by means of said feed plate relative to said looper, said
feed plate, and further including driving gear for said
feed plate being pivotally supported and slidable on the 55 feed bar and for said rotatable shaft and said looper oper
machine housing for tilting movement, and said ring
atively connected to said drive shaft, and means for ad
support being movable into inclined position in align
justing said feed dog including jaws at one end of said
ment with said feed plate for the position of disengage
feed bar and a transverse shaft movable relative to said
ment between said ring and said looper and into a posi
jaws; a pivot support disposed below said looper, hinge
60
tion at right angles with respect to said feed plate for
means provided at the end of said feed plate adjacent said
the operative position of said ring relative to said looper.
feed dog and a ring support carrying said bobbin sup
3. In a sewing machine of the type having a housing,
and including a drive shaft supported in said housing, a
porting ring, said ring support being connected at one
end to said pivot support and at the other end to said
feed bar comprising a feed dog supported in said housing,
hinge means and being movable with said supporting ring
a feed plate extending in closed condition in alignment 65 and by means of said feed plate relative to said looper,
with said feed dog, a ring looper, a bobbin, a ring tilt
said feed plate being pivotally supported and slidable on
ably supporting said bobbin proximate said looper for
the machine housing for tilting movement by means in
cooperation therewith, a rotatable shaft extending trans
cluding a guide pin for said feed plate mounted in said
versely of said housing and supporting said looper proxi
housing and a pair of slotted guide members disposed
mate said feed dog for rotation about its axis in ?xed 70 below said feed plate and slidable on said guide pin,
position relative to said feed plate, and further including
said means for adjusting said feed dog further including
driving gear for said feed bar and for said rotatable shaft
an adjusting knob and an operating lever linked to said
and said looper operatively connected to said drive shaft;
adjusting knob and movable therewith to raise and lower
a pivot support disposed below said looper, hinge means
said
feed dog and to move said transverse shaft relative
provided at the end of said feed plate adjacent said feed 75
3,031,989
to 'said‘ jaws, and said pivot shaft of said ring support
having a member de?ning a latch rotatable With said
pivot shaft and with said ring support adapted in the
operative positon of said feed plate to engagesaidoper
ating lever for locking said lever in operative position.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,086,662
Gould _____ __ ____ _,__.__ Feb. 10, 1914
8
1,548,464
1,941,083
2,671,420
Backlin ___________ ______ Mar. 9, 1954
581,186
697,979
Germany ___________ __ July 22, 1933
Germany ____________ __ Oct. 29, 1940
Hemle-b _____ __- ______ __ Aug. 4, 1925
Goosman ______ __,_____ Dec. 26, 1933
FOREIGN PATENTS
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