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Патент USA US2128573

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Aug. 30, 1938.
_ w, MYERs _
2,128,573
LUBRICA'I'ING MEANS FOR .SEWING MACHINE LOOP-TAKERS
"
Filed NQV. 12, 1937
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' 2,128,573
v Patented Aug. 30, 1-938‘ _ _
' UNITED sTArEs ‘PATENT OFFICIE.
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2,128,513
LUBRIOATING Means ron sawmc‘
mom Loor-rAKEas
Walter Myers, Bridgeport, Conn., assignor to The
' Singer Manufacturing Company, Elizabeth,
N. J.,- a corporation of New Jersey
Application November 12, 1937, Serial No. 174,137
‘
12 Claimsf, (01. 112-256)
This invention relates to _'improvements in
'_ means for lubricating the thread-case raceway of
sewing machine loop-takers and more partic
V
horizontal aperture 18 of a bearing-bushing l9,
secured by a screw 20 for endwise adjustment in
an aperture 2 I, provided in a casing or supporting
block 22 depending from the bed-plate l.
‘The loop-taker hubv ll abuts one end of the a
the horizontal-axis rotary hooktype.
bearing-bushing
l9 and extends‘through a clear
- The present invention has for its primary ob
jects to provide simple and-eilicient means for ance-aperture 23 ‘of a guard-plate“ having an
annular ?ange 25 secured by screws 26 to the
supplying lubricant to thread-case raceways of
rotary loop-takers‘and to bearings of the loop_-' end-face of the supporting block 22, 'a sealing
gasket 21 being preferably interposed between the
taker actuating shafts: Other objects of the in
vention'will be. apparent from the following de; ?ange 25 and the block 22. The ?anged guard
_ ularly the thread-case raceway of loop-takers of
5
'
'
10
- scription and claims. '
:-
' plate 24 provides a cavity 28 collecting oil seeping
v
The invention consists in the lubricating means
from the adjacent end of the shaft-bearing aper
ferred embodiment of the ‘invention, and in
taker hub ll. 'I’he‘oil-collecting cavity 28 is con
ture i8 of the bearing-bushing i 9, which oil is_
~ hereinafter described in connection with the ac
" 15 companying drawing which illustrates a -pre- _ centrifugally thrown o? by the end of the loop
stantly drained through a groove 29 in the outer .
Fig; 1 represents a vertical section of a portion ' face of and extending lengthwise of the bushing
it from the bottom of said cavity 28.
i of the bed-plate of a sewing machine containing
‘which:
-
'20 the improvement, the needle and the lower por
tion of the needle-bar beinglshown in elevation.
Fig. -2 represents a cross-section on substantially
the line 2--2 of Fig‘. 1.
.
, The sewing machine illustrated in the drawing
has a work-supporting bed-plate I provided with
a throat-plate 2 having the usual aperture 3 for
the vertically reciprocatory needle 6 carried by
the needle-bar 5.
1
Cooperating with the ‘needle 4, ‘below the
The casing or supporting block 22 is provided ‘-‘
with a downwardly open cavity 30, closed by a
plate 38 removably secured to the bottom of said
block by screws 32, a gasket 33 being preferably:
employed to seai the joint. One end of the bear
ing~bushing l9 extends into the cavity 30, and 25
the end of the loop-taker shaft l6 within said
cavity carries a1 driven spur-gear 34 which bears
against said end of the bushing. Meshing with
the spur-gear 34 is a driving spur-gear 35 secured
30
throat-plate 2, in the formation of lock-stitches. ‘ by a screw 36 upon one end of .a loop-taker actu
ating shaft 31. The shaft 31 is journaled in a
is a rotary loop-taker 6 which, in the present in
stance, is of the horizontal-axis rotary-hook type bearing-bushing 38 secured by a screw-39 for end
wise adjustment in a horizontal aperture til, pro
and performs two rotations for each reciproca
vided in the wall of the block 22 at the side of the
tion of the needle. The loop-taker 6 has a cup
shaped body internally provided with an annular
raceway l. Journal'ed in the raceway l is the pe
ripheral bearing rib B of a thread-case 9', said
thread-case being restrained against rotation
_with the loop-taker by a stationary stop-?nger
'40
l0.
'
‘
The loop-taker 6 has a hub ll‘ of which the
axial aperture is closed at the inner face of the
loop-taker body by a plate l2. The loop-taker
body has a radially extending duct l3 connected
at-its outer end with a transverse, wick-\?lled duct
It opening into the raceway ‘I. The duct 13 is
illustrated, in the drawing also ‘as wick-?lled,
cavity 30 opposite to the wall which supports the
bushing Hi. In the present case, the spur-gears
are proportioned so thatthe loop-taker shaft ro
tates twice for each rotation of the shaft 31, the
latter performing one rotation for each complete
reciprocation of the needle and being actuated in ‘ 40
any usual or suitable manner.
It will be understood from the foregoing de
scription that the gears 34 and 35 are housed in
the cavity 30 of the block 22. ,The cavity 30 also
serves as a lubricant chamber, the lubricant be
ing supplied thereto through an ‘aperture M in
the bed-plate I and opening into said cavity, said
aperture lil being normally closed by a screw
but this wicking may be omitted.
The hub H of the loop-taker t is secured by'a '. vplug 42. The depth of the lubricant in the cavity
screw l5 upon one end of a horizontally disposed 30 is, preferably limited by providing a side wall
loop-taker shaft IS, the end of saidshaft within of said cavity with an aperture 43 normally closed
the hub It being preferably spaced from the plate by a screw-plug 44, said aperture 43 being so lo
l2 to provide therebetween an annular recess ll’ cated that the teeth of the driving spur-gear) 35
dip into the lubricant.
’
in which the inner end of the radial duct l3 ter
The loop-taker shaft It has a longitudinal bore
55 minates. The shaft l3 isrotatably journaled in a ~
2
araawa
65 extending throughout the length of the shaft,
the end'of said shaft carrying the loop-taker be
ing counter-bored to provide an annular shaft
recess 66 adjacent to and opening into the loop
taker recess ll. Suspended lengthwise in the
shaft-bore 45 so as to be spaced from the shaft I6
is a stationary oil-conduit in the form of a tube
47, of which one end terminates in the loop-taker
recess I‘! and the other end is suitably secured in a
10’ horizontal aperture 68 provided in a supporting
plug 49. The plug 49 is adjustably secured by a
screw 50 in an aperture 5| of the block 22, in
alinement with the bearing-bushing aperture 2|
of said block, said plug extending into the block
15 cavity 30 and having its inner end closely adjacent
to the spur-gear 3% as well as spaced from the up
per wall of said cavity 30. The described inner
end of the supporting-plug ‘i9 is provided with a
The actuating shaft bushing 38 is likewise pro
vided with an oil-collecting duct 55 which opens
into a groove 56 in and extending lengthwise 0f
the shaft-bearing face of said bushing 38, said
groove preferably terminating short of the op
posite ends of the bushing. It will therefore be
understood that the bearings for the shafts l6 and
31, carried by the block 22 are automatically lubri
cated upon operation of the machine.
Having thus set forth the nature of the inven 10
tion, what I claim herein is:1. In a ‘sewing machine, a rotary loop-taker
body having a thread-carrier raceway and pro
vided with a recess having lubricant-conducting
connections with said raceway, a stationary
lubricant-conduit terminating in said recess sub
stantially axially of I said loophtaker body, and ‘
the cavity 30 and its lower end connected with the
means for supplying lubricant to said conduit.
2. In a sewing machine, a rotary loop-taker
body having a thread-carrier raceway and pro 20
vided centrally of said body with a recess having
tube 47.
lubricant-conducting connections with said 'race
substantially vertical oil-collecting pocket 52, said
20 pocket having its open upper end exposed within
.
During the operation of the machine, the ro
tating gears 34, 35 serve as lubricant-impelling
25 means, and splash the lubricant against the upper
wall of the cavity 30, a portion of said lubricant
way, a stationary lubricant-conduit coaxial with
said body and terminating in said recess, and
means for supplying lubricant to said conduit.
25
3. In a sewing machine, a rotary loop-taker
having a thread-carrier raceway, ‘a rotary shaft
carrying said loop-taker and provided with a lon
taker recess IT for supplying lubricant to the gitudinal bore having lubricant-conducting con
nections with said raceway, a stationary tubular 30
30 connected wick-?lled ducts Hi, It of the loop
taker. Excess lubricant delivered by the tube M conduit extending lengthwise of said shaft bore
within and in spaced relation to said shaft, and
will‘ drain back through the shaft-bore 65, out
side the tube 61, and into the block-cavity 30._ 1 As ' means effective during the operation of the ma
chine for supplying lubricant to said conduit.
the loop-taker recess ll is slightly larger in diam
4. In a sewing machine, a rotary loop-taker
35 eter than the shaft-recess t6, and as the shaft
recess 66 is itself slightly larger diametrically than body having a thread-carrier raceway and radial
ly-extending means for conducting lubricant to
the shaft-bore ?5,/a small quantity of lubricant re
mains in said recesses even after the machine is said raceway, a rotary loop-taker shaft having
stopped. This has the advantage that lubricant a longitudinal bore, a stationary lubricant-com
40 is immediately supplied to the radial bore I3 of the duit disposed within the bore of said shaft and
loop-taker upon starting the machine. The radial having one end terminating adjacent to said
bore i3 is so located in the loop-taker body that radially-extending means, and means e?ective,
' said bore is disposed above the loop-taker recess during the operation of the machine for supplying
I‘! in the usual stopping position of the machine lubricant to said conduit.‘
,
being collected by the pocket 52 and being de
livered by the stationary tube 151 into the ‘loop
45 with the needle in raised position, so that no
5. In a_ sewing machine, a rotary loop-taker
lubricant is supplied to said radial bore when the
machine is idle.
Inasmuch as oil is splashed against the top wall
of the cavity 30 at even moderate speeds of op
eration of the machine, oil is collected in the
pocket 52 at any speeds actually requiring lubrica
tion of the loop-taker raceway. The oil is de-v
livered without pressure by the tube M to the
loop-taker recess I1 and, while it will therefore be
55 understood that the supply ‘is substantially con
stant, the quantity of oil conducted to the raceway
‘I varies with the centrifugal oil-feeding action
through the radial bore I3 of the loop-taker at
different speeds of operation of the machine.
60 This action is permitted because of the fact that
body having a thread-carrier raceway and lubri
cant-conducting means connected with said race
way, a rotary shaft carrying said loop-taker body
and provided with a longitudinal bore, a station
ary conduit disposed lengthwise in the bore of 50
said shaft, said conduit having one end terminat
ing adjacent to said lubricant-conducting means
of the loop-taker body, and means effective dur
an excess of oil is delivered by the tube 41, as
already described. '
-
The end-portion of the bearing-bushing I!
which extends into the cavity 30 is provided with
an oil-duct 53 having its open outer end directed
toward the upper wall of the cavity 30 and its
inner end terminating in a groove 54 in and ex
tending lengthwise of the shaft-bearing face of
the bushing 19, said groove preferably terminat
70 ing short of the opposite ends of the bushing. As
previously explained, any oil which may seep
from the bushing at the loop-taker end of the
shaft I6 is collected in the cavity 28 and is re
turned through the drainage groove 29- to the
75
block-cavity 30.
I
'
ing the operation of the machine for supplying
lubricant to said conduit.
6. In a sewing machine, a rotary loop_taker_
body having‘ a thread-carrier raceway, a station
ary lubricant-conduit coaxial with said raceway
and extending into said body, means effective
during the operation of the machine for supplying (30
lubricant to said conduit, and means for direct
ing to said raceway lubricant delivered by said
conduit within said body.
,
'1. In a sewing machine, a rotary shaft, a loop
taker carried by one end of said shaft and having
a thread-carrier raceway, said shaft having a
longitudinal bore extending from the end of said
shaft opposite to the loopltaker end thereof and
having lubricant-conducting connections with
said raceway, a stationary tubular conduit extend 0.
ing into the bore of and spaced from said shaft, a
condui?supporting member having a- lubricant
collecting pocket open to saidconduit, and means
effective during the operation of the machine for
supplying lubricant to said pocket.
75
‘ 3
2,128,573
8. In a sewing machine, a rotary loop-taker
body having a thread-carrier raceway and pro
vided centrally of said body with a recess having
lubricant-conducting connections with said race
, way, a rotary shaft carrying said loop-taker and
_ having a longitudinal bore, a stationary lubricant
conduit extending lengthwise through said shaft
bore and having one end terminating in said re
cess, a member supporting the other end of said
10 conduit and provided with a lubricant-collecting
pocket open to said conduit, and means effective
during the operation of the machine for supply
ing lubricant to said pocket.
9. In a sewing machine, a rotary loop-taker
15 body having a thread-carrier raceway and pro
vided with a recess having lubricant-conducting
connections with said raceway, a casing having a.
lubricant-supply chamber, means e?ective during
the operation of the machine for delivering lubri
cant to said recess from said chamber, and means
for draining into said chamber excess lubricant
delivered to said recess.
_
‘
10. In a sewing machine, a rotary loop-taker
body having a thread-carrier raceway and pro
vided with a recess having lubricant-conducting
vconnections with said raceway, a rotary loop
taker carrying shaft having a longitudinal bore
terminating at one end in said recess, a stationary
lubricant-conduit disposed lengthwise within said
shaft to provide a recess-draining channel in the
bore of said shaft exteriorly of said conduit, said
conduit having one end terminating in said recess,
and means connected to the other end of said
conduit for supplying lubricant thereto.
,
'
11, In a sewing machine, a rotary shaft having
a longitudinal bore, a centrally recessed-3100p
taker body secured upon one end of said shaft
and provided with a thread-case raceway having
lubric ant-conducting connections with the central
recess of said body,- said shaft-bore having a _
counter-bore connection with said recess, a lubri
cant-conduit disposed in the bore of said shaft 10
and having one end terminating in said recess,
and means connected to the other end of said
conduit for supplying lubricant thereto.
12. A sewing machine having a cloth-plate, a
supporting block depending from said cloth-plate 15
and provided with- a lubricant-supply chamber, _
lubricant-impelling means within said chamber,
a horizontally apertured bearing-bushing secured
in said supporting block and having a lubricant
collecting ‘duct within said chamber, a. rotary
20
shaft journaled in said bearing-bushing,'a.loop
taker secured upon one end of said shaft and hav
ing a thread-case raceway, a lubricant-collecting
pocket within said chamber, means for directing
lubricant collected by said pocket to said race 25
way, means for directing lubricant collected by
said duct lengthwise of the shaft-bearing face of
said bushing, a guard-plate providing an oil-col
lecting cavity at the loop-taker end of said bush
ing, and means for draining lubricant from said 30
guard-plate cavity into said chamber. '
‘WALTER MYERS.
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