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Патент USA US2133921

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Oct. 18, 1938.
_1_-D KARLE
2,133,921
BoßBIN> WINDER FOR SEWING MACHINES
Filed Nov. 2o, 1937
2 Sheets-Shget 1
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Oct. 18, 1938.
J. D. .KARLE
2,133,921
BOBBIN WINDER FOR SEWING'MACHINES
Filed NOV. 20, 1957
2 Sheets-Sheet 2
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ÍNVENTOR.
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ATTORNEYS.
2,133,921»>
Patented Oct. 18, 1938
UNITED STATES PATENT OFFICE
2,133,921
BOBBIN WINDER FOR SEWING MACHINES
John D. Karle, Roselle Park, N. J., assigner to
The Singer Manufacturing Company, Eliza
beth, N. J., a corporation of New Jersey
Application November 20, 1937, Serial No. 175,601
13 Claims. (Cl. 242-22)
by a pin 3, a sleeve 4 upon which is rotatably
journaled a hand- or balance-wheel 5, provided
This invention relates to bobbin-winders for
sewing machines and it has among its objects to
with an annular rim or runway 6. As shown in
_ provide an improved device of this nature which
the drawings, the wheel 5 is adapted to be rotated
will have a straight line movement between its
by an electric motor M through the medium of a
worm 'I secured upon the motor shaft 8 and a
5I operative and inoperative positions; which will
afford a more convenient adjustment to com
pensate for wear in the usual rubber-tired drive
cooperating worm-wheel 9 fixed to the hub 5a of
the balance-wheel 5. It is to be understood,
however, that any other suitable means maybe
employed to rotate the balance-wheel. Clutch
means, comprising a manually rotatable clamp
screw I9, threaded into the sleeve 4, as shown
wheel; which will provide a greater leverage on
the latch-lever that holds the device in operative
10 position, whereby the lever may be shifted by
less pressure on the thread; and which will
eliminate the usual upstanding portion of the
motor-supporting casting on which, in prior con
structions, the 'spindle-carrying arm was epiv
15. otally mounted. In the prior constructions this
,upstanding portion was in the way of the op
erator’s thumb and interfered with the manual
turning of the balance-wheel.
With the above and other objects in view, as
will hereinafter appear, the invention comprises
the devices, combinations and arrangements of
parts hereinafter described in connection with
the accompanying drawings in which
Fig. 1 is a plan view, partly in section, of one
25. end of a sewing machine bracket-arm embodying
a preferred form of the present improved bobbin
wînder.
most clearly in Fig. 4,~is provided for clamping
the balance-wheel to the sleeve 4 so that
rotation of the balance-wheel will drive the main l5.
shaft 2. The'hub 5a of the balance-wheel isy
journaled on the sleeve 4 between an annularY
shoulder 4a thereon and a thrust washer II
slidingly mounted on the outer end of the sleeve.
The clamp-screw is adapted to bear against the
washer II and thereby clamp the hub of the
balance-wheel between the washer and the shoul
der ‘la to cause the sleeve 4 and main shaft!
to be rotated by the balance-wheel. The rim 6
of the balance-wheel serves to actuate the
bobbin-Winder, later to be described, and, to per
mit bobbins to be wound without rotating the
main shaft, the clamp-screw I0 may be backed
off to unclamp the balance-wheel from the sleeve
4. Pins IIa, carried by the washer I I, cooperate
with the inner end of a stop-screw I3 threaded
into the clamp-screw I0 to prevent undue -loosen
f
Fig. 2 is an end view of Fig. 1, looking in the
direction indicated by the arrow A, but with the
'30 hand-wheel and parts carried thereby omitted.
Fig. 3 is a sectional view substantially on the
lines 3-3 of Figs. 1 and 4.
Fig. 4 is a vertical sectional view substantially
on the line 4-4 of Fig. 3.
35
ing of the clamp-screw.
Fig. 5 is a vertical sectional View substantially
on the line 5-5 of Fig. l.
Fig. 6 is a detail rear end View of a portion of
the bobbin-Winder, looking in the direction i11
ïdicated by the arrow B in Fig. 3.
40
v
M and its shaft 8 are carried by a bracket or
casting I2 secured to the frame I, as by screws
.
Fig. '7 is a perspective view of a latch-lever
I4. After assembly, the bracket I2 is, in effect,
forming a part of the improved bobbin-Winder.
Fig. 9 is a diagrammatic View illustrating a
camming action on the bobbin-Winder» latch
a portion of the frame I and for the purpose of
‘this disclosure may be so considered.
The Peets patent discloses a conventional form
of bobbin-Winder including an upwardly and
‘forwardly inclined arm 5I on which is pivoted
lever, later to be described.
‘the bell-crank lever 53 which carries the bobbin- t
Fig. 8 is a view similar to the upper portion
,fof Fig. 3 but showing the bobbin-Winder in its
inoperative position.
,
Fig. 10 is a view-similar to Fig. 5 but showing
a modified construction.
50
.
The mechanism hereinbefore described is sub
stantially the same in construction and operation
as that forming the subject of United States
patent to W. J. Peets, No. 1,934,373, Nov. 7, 1933.
Also as disclosed in the Peets patent, the motor
.
Referring more speciiically to the drawings,
the invention is disclosed as embodied in a sew
ing machine, comprising a frame I formed with
a cylindrical bearing-boss Ia in which is jour-naled a main or needle-bar driving shaft 2. At
55 its rear end the shaft 2 has secured thereto, as
winder spindle 54. As hereinbefore stated, these
upstanding parts are somewhat in the wayof the
operator’s thumb and interfere with the manual 50
turning of the balance-wheel. 'I‘he Peets patent
also embodies a latch-lever 51 to hold the bobbin
winder in operative position during the winding
of the bobbin and which is tripped to throw the
bobbin-Winder out of action when the bobbin is 55
2
2,133,921
»,filled. This latch-lever has a relatively short
actuating lever-arm and therefore a considerable
pressure on the thread is required to trip the
latch.
In some cases this excessive pressure on
the thread is undesirable.
The present improved bobbin-Winder elimi
nates the upstanding portions which were in the
way of the operator’s thumb; it substitutes a
straight line movement for the swinging move
10 ment of the spindle carrier; it provides increased
leverage for the latch-lever whereby it may be
tripped by less pressure on the thread, and it pro
vides a convenient adjustment to compensate for
wear in the rubber-tired drive wheel.
15
The preferred form of bobbin-Winder, as dis
closed in Figs. 1 to 9, comprises a supporting rod
I5, of uniform diameter throughout, translat
ably but nonrotatably mounted within a hori
zontally disposed cylindrical bore IS formed in a
20 tubular bearing boss |'I perpendicular to the main
shaft 2. This boss may be provided by the frame
I or it may be formed integral with the motor
supporting casting I2. At its forward end the
rod l5 has a transverse head I8 formed with a
25 bore I9 in which is rotatably journaled a spindle
2D adapted, at one end, to receive and hold a
sewing machine bobbin B. At its opposite end
the spindle 28 has secured to it a rubber-tired
driving wheel 2|, adapted, in the inner position
30 of the rod I5, to engage the annular rim E of the
balance-wheel, whereby rotation is transmitted
from the balance-wheel to the spindle 25 and the
bobbin carried thereby. To prevent the rod l5
from rotating in its bearing, the rear end of the
rod carries a horizontally disposed plate 22 which
projects laterally from the rod and slides in
transverse slots 23 formed in the side walls of
the bearing boss I'I. The wall at the inner end
of this slot forms an abutment for the plate 22
40 and thereby limits the outward movement of the
rod I5.
Latch means is provided for holding the rod
I5 in its innermost, or bobbin-winding position,
with the wheel 2| in driving contact with the
45 rim B of the balance-wheel. This latch means
comprises a lever 24 fulcrumed intermediate its
ends on a Shoulder screw 25 threaded into the
bearing boss I'I. The forward end of the lever
24 is curved, as shown at 24a, and is adapted to
50 bear upon the thread being wound upon the bob
bin. A coiled spring 2B, located within a cavity
21 in the bearing boss I'I, about the screw 25,
has one off-set end 26a secured in the bearing
boss and the other off-set end 25h engaging the
55 latch-lever 24, and normally urges the forward
end of the lever downwardly into contact with
the thread on the bobbin. The rearward end 24’n
oí the lever 24 forms an abutment for a block 28
adjustably secured, by a screw 29, to the trans
60 verse plate 22, carried by the supporting rod I5,
and serves, during a bobbin-winding operation
to hold the rod in its innermost position thereby
to maintain the rubber-tired` wheel in Contact
with the rim 6 of the balance-wheel. The block
65 28 serves as means to adjust the rod I5 axially to
compensate for wear in the wheel 2| and also to
predetermine the amount of thread to be wound
on the bobbin. The rod I5 and the parts carried
thereby are normally urged outwardly, to the
position indicated in dotted lines in Fig. 5, in
which the wheel 2| is out of contact with the
rim 6 of the balance-wheel, by a coil-spring 30
having one end located within a bore 3! formed
in the bearing boss I‘I parallel with the bore I5.
75 The outer end of the spring bears against the
transverse head |8 of the rod I5. A sheet-metal
sleeve 32 surrounds and protects the spring 30
and has one end fixed within a bore 33 in the
head I8. The other end of the sleeve is slidingly
mounted in the bore 3|.
The lever 24 preferably is made of a sheet
metal stamping and is bent intermediate its ends
along a line :1J-:12, Fig. 7, so that its forward por
tion lies substantially in a horizontal plane while
its rearward portion stands in a vertical plane, as
shown most clearly in Figs. 1 and '7. As illus
trated in Fig. 9, the rearward end 24b of the latch
lever 24 is formed as an arc of a circle the radius
R of which extends from the fulcrum-point of the
lever. Therefore swinging of the latch-lever 15
under the influence of the thread on the bobbin
will have no effect on the supporting rod I5 until
the upper corner of the latch-lever is moved be
low the lower edge of the plate 28.
Fig. 10 illustrates a modification which differs 20
from the construction shown in Fig. 5 in that, in
the modified construction, the translatable rod
|5a, having a transverse head Ißß which carries'
the spindle 20, is made of two diameters and is
ñtted within a stepped bearing. The smaller di 25
ameter I5b is slidingly mounted in a bore ||iß
in the bearing boss |'I and the larger diameter I5c
is fitted within a counterbore H5b in the boss. In
place of the spring 39 (Fig. 5) for shifting the
rod, and the parts carried thereby, the modified 30
construction employs a larger spring 30@L located
within the counterbore | 6b between a shoulder I5d
on the rod and the bottom wall I6.c of the counter
bore.
'
The operation of the improved bobbin-Winder 85
is as follows. 'I‘he operator, having released the
clamp-screw I0 to disconnect the balance-wheel
from the main shaft, places an empty bobbin B2
on the free end of the spindle 20 and manually
winds the thread T a few turns thereon. Next she
pushes inwardly on the head I8 to force the rub
ber-tired wheel 2|, from the position shown in
Fig. 8, into driving contact with the rim E of the
balance-wheel. This movement causes the block
281:0 ride oir the end of the tail 24h of the anch 45
lever 24, whereupon the spring 26 turns the latch
lever clockwise and places the tail 24b thereof in
the path of movement of the block, as shown ln
Fig. 3, and prevents endwise movement of the
rod I5 under the influence of the spring 30. Ro 56
tation of the balance-wheel by the motor Mrwill
then rotate the spindle 2i) and cause the thread
to be wound on the bobbin. The curved portion
24a of the latch-lever bears upon the thread on
the bobbin and, as the thread builds up thereon,
it gradually shifts the lever 24 counter-clockwise
until, when the bobbin is filled, the tail 24b re
leases the block 28 and permits the spring 30 to
shift the rod I5 and the parts carried thereby to
the inoperative position shown in Fig. 8. As illus
trated diagrammatically in Fig. 9, the angle of the
upper edge 24° of the tail-piece 24b to the bottom
surface 28a of the block 28 is such that as the
block is shifted forward by the spring 30 it has a
camming action on the latch-lever and thereby
tips it slightly counterclockwise as Viewed in Fig.
9, and raises the forward end 24a out of contact
with the thread and above the side wall of the
bobbin to facilitate removal of the bobbin from
the spindle. ‘This camming action also serves as 70
a shock-absorber, or snubber, on the rodw |5 and
thereby eases it into its inoperative position.
Having thus set forth the nature of the inven
tion, what I claim herein is:
1. A bobbin-Winder, for sewing machines hav
3
2,133,921
ing a frame and a >balance-wheel supported’by
said frame and provided with an annular run
way, comprising an endwise movable supporting
rod slidingly mounted in said frame, a rotatable
bobbin-carrying spindle carried by one end of
said supporting rod, a drive-wheel secured to said
spindle and adapted to be engaged with the annu
lar runway on said balance-wheel, spring means
normally acting to shift said rod endwise to posi
10 tion said drive-wheel out of contact with said run
way, a latch-lever fulcrumed intermediate its ends
on a stationary portion of the sewing machine,
one end of said lever being adapted to bear upon
the thread being wound on the bobbin and the
15 other end forming an abutment, and a member
secured to the other end of said rod and cooperat
ing with said abutment to maintain said sup
porting rod in a position to hold said drive-wheel
in contact with said runway until said lever is
shifted sumciently by the thread to move said
abutment out of the path of said member.
2. A bobbin-Winder, for sewing machines hav
ing a frame and a balance-wheel supported by
said frame and provided with an annular run
way, comprising an endwise movable supporting
rod slidingly mounted in said frame, a head on
one end of said rod, a bobbin-carrying spindle
journaled in said head transverse to said sup
porting rod, a drive-wheel secured to said spindle
and adapted to be engaged with the annular run
way on said balance-wheel, spring means nor
member adjustably supported by the other end of
said rod and cooperating with said latch-lever to
maintain said supporting rod in a position to
hold said drive-wheel in contact with said run
way.
5.l A bobbin-Winder, for sewing machines hav
ing a frame >provided with a bearing boss formed
with a bore and a transverse slot and a balance
wheel provided with an annular runway, compris
ing an endwise movable supporting rod slidably 10
mounted in said bore, a bobbin-carrying spindle
rotatably journaled at one end of said supporting
rod, a plate secured to the other end of said‘ro-d
and slidingly fitted within the transverse slot
in the frame to prevent rotation of said rod, a re
silient drive-wheel secured to said spindle and
adapted to be engaged with the annular run-way
on said balance-wheel, spring means normally
acting to shift said rod endwise to position said
drive-wheel out of contact with said runway, a
latch-lever fulcrumed intermediate its ends on a
stationary portion of the sewing machine, Aand a
member adjustably secured to said plate and coop
erating with said latch-lever to maintain said
supporting rod in a position to hold said drive
wheel in- contact with said runway, the adjust
ment of said member serving to compensate for
wear on said drive-wheel.
6. A bobbin-Winder as set forth in claim l, in
which the latch-lever is made of a sheet metal
stamping bent intermediate its .ends to afford a
mally acting to shift said rod endwise to posi
tion said drive-wheel out of contact with said
horizontally disposed portion adapted to bear on
runway, a latch-lever fulcrumed intermediate its
ends on a stationary portion of the sewing ma
tically disposed portion adapted to receive a
35
fulcrum-screw and to provide said abutment.
the thread being wound on the bobbin and a ver
chine, and a member secured to the other end of
said rod and cooperating with said latch-lever to
maintain said supporting rod in a position to hold
said drive-wheel in contact with said runway.
40
3. A bobbin-Winder, for sewing machines hav
7. A bobbin-Winder as set forth in claim l in
which that end of the latch-lever which affords
ing a frame and a balance-wheel provided with an
of the latch-lever under the influence of the
thread being wound on the bobbin has no effect
on the spindle-supporting rod until the end of
annular runway, comprising a bearing boss
formed on said frame and provided with a bore
and a transverse slot, an endwise movable~ sup
n. Ll
porting rod slidably mounted in the bore in said
bearing boss, a head on the forward end of said
rod, a bobbin-carrying spindle journaled in said
head transverse to said supporting rod, a plate
secured to the rearward end of said rod and
having projecting ends slidingly fitted within the
slot in said bearing boss to prevent rotation of said
rod, a drive-wheel secured to said spindle and
adapted to be engaged with the annular runway
on said balance-wheel, spring means normally
acting to shift said rod endwise to position said
the abutment is formed as an arc of a circle, the
axis of which coincides with the axis of the
fulcrum of the latch-lever, whereby movement 40
the latch-lever is moved below the path of move
ment of said cooperating member.
,
8. A bobbin-Winder as set forth in claim 1 in
which the upper edge of the abutment‘end of the
latch-lever is arranged at an acute angle to, but
in the path of movement of, the cooperating mem
ber carried by the supporting rod, whereby move 50
ment of said member, when the bobbin-Winder
is shifted to inoperative position, causes the latch
lever-to be tipped about its fulcrum to lift the for
ward end thereof out of contact with the thread
on the bobbin, the latch-lever also serving as a
drive-wheel out of contact with said runway, a
latch-lever fulcrumed intermediate its ends on a
shock-absorber for the supporting rod.
stationary portion 0f the sewing machine, and a
member secured to the rearward end of said rod
and cooperating with said latch-lever to main
tain said supporting rod in a position to holo.
said drive-wheel in contact with said runway.
4. A bobbin-Winder, for sewing machines hav
which the means for shifting the supporting rod
axially comprises a coil-spring interposed be
tween the frame and the transverse spindle 60
supporting head at one side of and parallel to
said rod.
ing a frame and a balance-wheel provided with an
in which the bore in the bearing boss and the
supporting rod movable therein are each formed 65
of two diameters and the means for shifting the
rod axially comprises a coil-spring located in the
larger bore and surrounding the smaller diam
eter of the rod.
1l. The combination with a sewing machine 70
frame, a rotary shaft journaled therein and a.
>balance-wheel coaxial with said shaft and adapt
ed to be connected therewith, said balance-wheel
being provided with an annular runway, of a
bobbin-Winder comprising a rod slidable endwise 75
‘ annular runway, comprising an endwise movable
supporting rod slidably mounted in a bore in said
frame, a rotatable bobbin-carrying spindle car
ried by one end of said supporting rod, a drive
wheel secured to said spindle and adapted to be
engaged with the annular runway on said bal
ance-wheel, spring means normally acting to
shift said rod endwise to position said drive
wheel out of contact with said runway, a latch
lever fulcrumed intermediate its ends on a sta
tionary portion of the sewing machine, and a
_ ’
9. A bobbin-Winder as set forth in claim 2 in
10. A bobbin-Winder as set forth in claim 3
4
2,133,921
in said frame at right angles to said shaft, a
bobbin~supporting spindle carried by said rod, a
spindle-driving wheel secured to said vspindle and
adapted to engage said runway, a spring nor
mally acting to shift said rod in one direction
to disengage said driving wheel from said run
way, latch means for holding said driving wheel
in engagement with said runway in opposition
to said spring, and means actuated by the thread
10 wound on the bobbin to release said latch means.
12. In a sewing machine, `in combination, a
frame, a motor~supporting bracket secured
thereto, a rotary shaft journaled in said frame,
a balance-wheel coaxial with said shaft and
15 adapted to be connected therewith, said balance
wheel being provided with an annular runway,
an electric motor carried by said bracket and
adapted to rotate said balance-wheel, and a
bobbin-winder comprising a supporting rod slid
able endwise in a bore in said bracket at right
angles to said shaft, means; to prevent rotation
of said rod in said bore, a bobbin-supporting
spindle carried by said rod, a spindle-driving
wheel secured to said spindle and adapted to
f engage said runway, a spring normally acting to
shift said rod in one direction to disengage said
driving Wheel from said runway, latch means
for holding said driving wheel in engagement
with said runway in opposition to said spring,
and means actuated by the thread wound on
the bobbin to release said latch means.
13. In a sewing machine, in combination,.a
frame, a motor-supporting bracket secured
thereto and having at its upper portion a bear
ing-boss provided with a horizontally disposed
bore, a rotary shaft journaled in said frame, a
balance-wheel coaxial with said shaft and adapt
ed to be connected therewith, said balance 10
wheel being provided with an annular runway,
an electric motor carried by said bracket and
adapted to rotate said balance-wheel, and abobbin-winder carried by said bracket and com
prising a rod slidable endwise in said bore per
pendicular to said shaft, means to prevent rota
tion of said rod in said borejav bobbin-support
ing spindle carried by said rod, a spindle-driving
wheel secured to said spindle and adapted to
engage said runway, a spring normally acting to 20
shift said rod in one direction to disengag'e said
driving wheel from said runway, latch means
for holding said driving Wheel in engagement
with said runway in opposition to said spring,
and means actuated by the thread wound on 25
the bobbin to release said latch means.
l
JOHN D. KARLE.
,
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