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Патент USA US3068830

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Dec. 18, 1962
s. J. KETTERER ErrAL
3,068,820
SEWING MACHINE LUBRICATION
2 Shoots-Shut 1
Filed June 24, 1959
INVENTORS'.
Stanley J. Ke/terer m
BY
22
Darwin 6. Smith.
XITTORNEY
De¢- 18, 1962
5. J. KETTERER EI'AL
3,068,820
SEWING MACHINE LUBRICATION
Filed June 24, 1959
_
2 Sheets-$11061 2
INVENTORS.
BY
Stanley J. Kai/ere! and
Darn/1h 6. Smith.
Wu ATTORNEY
6%
United States Patent 0” ice
Patented Dec. 18, 1962
1
2
3,068,820
pitman 24 carries a rotation restraining member (not
shown) for the bobbin case base 12 which not only pre
vents rotation of the bobbin case, but which also oscillates
SEWING MACHINE LUBRICATION
Stanley J. Ketterer, Stratford, and Darwin G. Smith,
'
3,068,820
Bridgeport, Conn., assignors to The Singer Manufactur
ing Company, Elizabeth, N.J., a corporation of New
Jersey
Filed June 24, 1959, Ser. No. 822,575
1 Claim. (Cl. 112-256)
to open a gap between the rotation restraining member
and the bobbin case base for the free passage ofthe
needle thread loop therebetween.
A lubricant reservoir 30 is provided in the machine
casing beneath the hook driving shaft 17. A top cover
31 on the reservoir is formed with an opening ‘32 through
The lubrication requirements for a high speed sewing 10 which depends an endless ?exible conveyor preferably
in the form of an ordinary bead-chain'33 of the con
machine parts and devices and, more particularly, to a
ventional ty-pe comprising alternate hollow spherical
novel lubricating device adapted for use with high speed
sewing machines.
The lubrication requirements for a high speed sewing
members ‘34, interconnected by cylindrical pins 35 which
and effective lubricating system which supplies the criti
screw 38 so as to prevent the ‘bead-chain from accident
ally shifting out of the groove 36.
i
are upset within the ‘hollow spherical members to link
machine are extremely critical. Not only must the mini 15 the parts together.
The bead-chain encircles and rests upon the shaft 17
mum requirements be met under all conditions, so as to
and is constrained thereon by an upwardly open chain
prevent overheating, wear, and the like, but an excess of
accommodating groove 36 formed in the shaft bushing
lubrication must be avoided to prevent spoilage of the
18, and by an arched cover member 37 which spans the
work fabrics being stitched.
It is an object of this invention to provide a.- simple 20 groove 36 and is secured to the bushing 18 by the set
> cal needs of a high speed sewing machine.
Another object of this invention is to provide an effi
In FIG. 2, the arrow indicates the direction of rota
tion of the hook driving shaft 17. The slot 36'in'the
cient lubricant transporting mechanism in which heating
of the lubricant and consequently of the sewing machine 25 bushing 18 on the side toward which the hook driving
shaft moves during rotation thereof, is formed with a
casing, because of inefficient turbulance, is minimized.
surface 39 ?ared outwardly from the cylindrical shaft
Still another object of this invention is to provide a
novel pump means for a sewing machine lubricating sys
tem driven in response to the operation of the stitch
engaging bearing surface of the bushing. The ?ared sur
face 39, together with the hook driving shaft 17, de?nes
forming instrumentalities of the sewing machine such that 30 a wedge-shaped catch-basin for lubricant on the‘ external
surface of the hook driving shaft.
'
> '
delivery of lubricant will cease immediately when sewing
The hook driving shaft is formed adjoining the groove '
is stopped on the machine.
36 with a spiral groove 50leading to a radial ‘port 51
With the above and other objects and advantages in
which communicates with an axial'bore 52 formed in the
view as will hereinafter appear, this invention comprises
the devices, combinations and arrangements of parts here 35 hook driving shaft. The'spiral groove 50 also leads to
an annular hook shaft portion 53 of reduced diameter
inafter described and illustrated in the accompanying
which is joined by a passageway 54 in the bushing 18, a
drawings of a. preferred embodiment in which:
passageway 55 in the web 19, and a radial port 56 formed
FIG. 1 represents a vertical cross-sectional view of a
in the fulcrum stud 25 to an axial bore 57 in the fulcrum
rotary hook for a sewing machine together with the ad
joining parts and devices and having the lubricating sys 40 stud. The fulcrum stud axial bore 57 extends to the free
extremity of the fulcrum stud which overhangs the lubri
tem of this invention applied thereto,
cant reservoir and in which free extermity a spring clip
FIG. 2 represents a vertical cross-sectional view taken
58 is disposed in order to direct lubricant therefrom di
substantially along line 2-—2 of FIG. 1, and
rectly back into the reservoir without driveling. A needle
FIG. 3 represents a horizontal cross-sectional view of
valve stem 59 threaded into the fulcrum stud 25 serves
the mechanism illustrated in FIG. 1.
45 to constrict the opening of the radial port 56 into the
Illustrated in FIGS. 1 and 3 is a conventional rotary
axial fulcrum stud bore 57. The passageways 54 and
hook 11 for a lock stitch sewing machine. As is well
55, the radial port 56, and the stud bore 57 thus provide
known in the art, the rotary hook is adapted to be driven
a bypass adjustable by the valve stem 59' to control the
two revolutions for each endwise reciprocation of a needle
(not shown) so as to carry a needle thread loop com 50 amount of lubricant delivered by the spiral groove 50 into
the axial hook shaft bore 52.
pletely about a bobbin case base 12 which is journaled
The cylindrical shank 14 of the rotary hook is formed
in a raceway 13 formed in the rotary hook. The bobbin
case base accommodates a bobbin (not shown) on which
is wound a bobbin thread that is concatenated with the
with a threaded bore 60 in which is accommodated an
insert 61 formed with a small ‘bore 62 opening into a
needle thread by the rotary hook to form lock stitches, 55 larger cylindrical bore 63 within which is disposed a
metering pin 64 the function of which is to provide a
it being understood that the bobbin case base 12 is pre
slight restriction to the passage of lubricant in order
vented from rotating with the rotary hook.
to provide for pressure to be developed in the bore 52
In the preferred embodiment of the drawings, the lubri
of the hook driving shaft in order that the bypass 54—57
cating system of this invention is illustrated as applied to
might operate effectively.
the problem of supplying lubricant to the raceway 13 of
the rotary hook. The rotary hook 11 is perferably so The rotary hook 11 is formed with a radial bore 70
leading from the threaded bore 60 to a recess 71 formed
near the periphery of the hook. A radial port 72 joins
the recess 71 with the hook raceway 13. Circular discs
extremity of a hook driving shaft 17. The shaft 17 is
journaled in a bushing 18 ?xed in a web 19 of the sewing 65 73 and 74 are seated tightly in access apertures in the
rotary hook leading to the recess 71 and the threaded
machine casing.
bore 60.
The rotary hook shank 14 and the hook driving shaft
Lubricant delivered along the axial bore 52 of the hook
17 are each secured in a connecting collar 21 by set screws
driving shaft is prevented from escaping between the
22 with the tongue 15 seated in the transverse groove
16. The connecting collar is formed with an eccentric 23 70 shank 14 of the rotary hook and the connecting member
21 by means of a packing ring 75 set into the connecting
embraced by a forked pitman 24 fulcrumed on a stud
member. Lubricant which may escape between the hook
25 secured in the sewing machine casing web 19. The
formed with a cylindrical shank 14 slabbed to de?ne a
tongue 15 seated in a transverse groove 16 formed in the
3,068,820
,
3
4
-
driving shaft 17 and the connecting member 21 will be
collected by the oil sling ?ange 76 on the connecting mem
rotary hook and formed with an axial bore, lubricant con
ber and thrown off into a recess 77 formed in the web
to said rotary hook raceway, a bushing formed with a
19 for drainage down the inclined passageway 78 back
into the lubricant reservoir. Any ‘lubricant which makes
its way along the'hook driving shaft' 17 beyond the oil
sling ?ange 76 will be pumped by the spiral groove 79
in the hook shaft back into the annular reduced portion
driving shaft, spiral groove pump means arranged between
said hook driving shaft and’ said bushing for forcing lubri
cant from the external surface of said hook driving shaft
into the axial bore thereof for delivery to the hook‘race
53.
~
'
ducting passageways extending from said hook shaft bore
cylindrical bearing surface snugly embracing said hook
way, means for delivering lubricant to the external sur
'
The complete lubricating system illustrated in the draw 10 face of said hook driving shaft comprising a lubricant res
ings may be considered as a two-stage pump. The ?rst
stage involves the raising of lubricant by means of the
bead-chain from the reservoir to the exterior surface of
ervoir carried in said sewing machine beneath the hook
driving shaft, said bushing formed with an upwardly
open conveyor accommodating slot exposing said hook
driving shaft, an endless conveyor encircling said hook
the hook driving shaft. The second stage involves the
forcing of lubricant by the spiral groove 50 into the axial 15, driving shaft comprising a bead'chain including alternate
hollow spherical beads and cylindrical connecting pins
bore of the hook and thence to the hook raceway.
The bead~chain expedient iby‘which the lubricant is
snugly accommodated in apertures in the beads and hav
raised from the reservoir 30 to the hook drive shaft affords
many distinct advantages. The construction is exceed
ing enlarged head portions formed within the hollow
beads tolock the bead-chain parts together, said endless
conveyor disposed in said upwardly extending conveyor
ingly simple and economical of manufacture, the only
moving part, other than the hook shaft, is the bead
slot and depending into said lubricant reservoir, said con
»veyor accommodating slot in the hook drive shaft bushing
chain, and, therefore, servicing and wear of parts is
minimized. The drive of the bead-chain by the hook
being formed on that side toward which the external sur
driving shaft is such as to provide readily for slippage,
face of the hook shaft movesduring rotation of said
and, therefore, one in which the power delivered to the 25 hook shaft with a surface portion ?aring gradually'out
bead-chain by the shaft is limited. During periods of
wardly from the cylindrical shaft engaging bearing sur
rapid acceleration of the hook drive shaft, therefore, the
drag imposed by the bead-chain is circumvented by slip
page of the chain on the shaft.
face of the bushing, said ?aring bearing surface-portion
together with the external surface of the hook driving
shaft de?ning a wedge shaped catch basin for admission
Similarly, during the
periods of high speed operation of the sewing machine,
slippage of the bead-chain will prevent unnecessarily large
30 of ‘lubricant from the external surface of the hook driv- .
ing shaft to the spiral groove pump means.
References Cited in the ?le of this patent
power drain from the hook shaft to the bead-chain, there
fore, averting unnecessary beating of the lubricant in the
reservoir into a froth as in commonly experienced with
positively coupled lubricant pumping devices in the prior
art
UNITED STATES PATENTS
35
.
l-Iaving thus described the nature of the invention, ,
what is
In: a
with‘ a
bobbin
claimed herein is:
sewing machine having a rotary hook‘ formed
raceway adapted to accommodate a stationary 40
case, a hook driving shaft connected with said
.
72,267,581
Zonis ______________ __ Dec, 23, 1941
2,317,240,
2,385,299
Zeier __ _______ _'____.V._‘__ Apr. 20, 1943
Parry ____________ __,__ Sept. 18, 1945
'
FOREIGN
PATENTS
.
V.
.
10,482
Great Britain __________ __ June 2, 1892
265,019
VGreat Britain ________ __ Feb. 3, 17927
UNITED STATES PATENT OFFICE
CERTIFICATE OF QRECTION
Patent No‘, 3,068,820Stanley J“ Ketterer e‘i; ale December 18?
It is hereby certified that error appears in the above numbered pat
ent requiring correction and that the said Letters Patent should read as
corrected below.
hlgh
_ ‘
Column
speed“ read
1, line
—-— This
10, for
invention.
"The lubrication
relates to requirements
the luhricatien
for
0i‘
~~°
Signed and sealed this 2nd day 0f July 1963a
(SEAL)
Attesi:
ERNEST w. SWIDER
DAVID L- LADD
Attesiing Officer
Commissioner of Patents
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