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Патент USA US2132892

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Oct. 1l, 1938. `
B. w. DAVIDSON
2,132,892
SEWING MACHINE
_
Filed Sept. 9, 1937
2 sheets-sheet 2
_13.4.
Boo/4er
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.pavé/S07?
gamen,
Patented Oct. 11, 1938
Y.2,132,892
_, UNITED
PATENT ' OFFICE «
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¿2,132,892
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#SEWING ivmoHINr:>
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Booker WlDavidson, Michigan .City,'Ind.r f l
applicatioe'september' 9, 1931-, „señala No. 163,129] '
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-aclantis.v
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My invention relates to improvementsin sewing r of a tubular operating shaft v| 6V therefor journaled
machines of the ' so-called> chainestitch type.
. in front and rear bearing sleeves I‘I, I„'I'r mounted
The primary object ofmy invention is to equip
Vin front and rear bearings I8, I8’ depending
a double thread machine for> thieformation of a
from the bed plate I. The,tubular operating
reinforced chain stitch, and with improved loop „ shaft I6 extends beneath and slightly, beyond the
forming and manipulating*mechanism.'y
ï
~
before-mentioned bevel gear I4’ into a housingV
Another object is to provide arrimpiîoved'thread
supply ~for suchr machines together with efficient
I9 suitably secured to the under side ofthe bed
plate I and to the rear bearing |8’.
guiding and
thread.
A bevel
tensioning means. for`_tl1e~'low'erV _gear |6’. fast onsaid tubular shaft Iii` meshes
with the bevel gear |_4' whereby said shaft |6 is
Other and subordinate objects fare*V valso comj-j' driven> as will be clear.l Theratio of drive be
10
prehended by my invention, all' of which` together " tween the V'rotary hook or looptaker I5 and the
with the exact nature of 'my improvements, will needle bary |0_is one revolution of th-e former to
be readily understood when the following descrip?
one reciprocation'of thelatter.
accompanying'drawings.
"
In said drawings:
v
» `^
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Suitably >mountedrin the rotary hook or loop
tion and claims are read withrreferenfce l'to the .
15
’ taker` |5,V in substantially thesame relation there'
to asthe vusual bobbin casing of the above desig
Figure 1 is a View partly in‘ side‘elevation and V`nated machinegis a ycombined guide and tension
partly in sectionof a sewing machine _embodying ing device
,
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20. . forl
thelower thread comprising a
my improvements.
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Y
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l.
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"cylindrical casingzl ‘having open front and rear
Figure 2 is a view inA perspective ‘of :my improved ‘ sides with -the Aexception of >a. transverse central
guiding> and tensioning >means ‘for the " lower
bar 22 extending across its rear side thereof.
thread and a rotary 'hookïor' `lfooptaker asso-î- The casing 2| is located directly beneath the
ciated‘therewith.’
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v
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` , needle I I and has a needle clearance opening 23,
` Figure 3 -is a View in Vperspective of the’thread " 'therein fora purpose presently seen.
guiding and‘tensioning means and loop taker
Secured to 25
the cross-barr22 and within the casing 2| is a
illustrating operation of the’latte’r.
thread guiding nipple 24 of tapered form having
Figure 4 is a perspective View of a loopfpick up ì its rear end` aligned with the tubular shaft I6.
mechanism.
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'
`The nipple 24 inclines upwardly and rearwardly
" Figure 5 is a perspective view'- illustrating the
and terminates adjacent toy a resilient thread 30
j tensioning member 2_5 clamped to the front edge
Figure 6 is a side elevation of a threading hook. ' 26 of the casing 2| by a screw 21. The casing 2|
formation of the stitch, and"
Referring to the illustrated embodiment ofmy. ` is removablyr secured in the rotaryhook or loop
invention in" detail, with >reference thereto by taker 4I 5f by> suitable means. (not shown) f and
C) CA numerals," |‘ designates the usual bed plate of the
slightly spacedfrom the latter to provide a slight
Singer sewing machine of commerce, V2 thestand->V c clearance therebetween so that the rotary hook or
35
ard thereof; 3 the tubular arm, 4 the’head, and 5 ’ loop taker `I5 is freely rotatable around said cas
the balance wheel. Associated withthe head 5. " ing 2|. A latch member, 28_mounted` on a fixed
_is the usualV thread take-_up Vlever 6; tensioning>` part ofthe machine cooperateswith a notch 29`
disks 'Ifor the upper thread, thread guidesß and 'in the front edge 26 of the casing 2| to hold the 40
8’,»presser foot S, and needle bar. I0.; driving the
combined guide and `tensioning ldevice k20A sta
tionary.l The front edge 26 of the casing 2| in
clines downwardly’ and rearwardly so that the'
loop taker` |_5fwill extend forwardly beyond said
needle’ I I through the usual throat'plate'l 2. The
driving mechanism, being well understood'in" the
art, hask not Vbeen illustrated, with the exception
“ of the’ drive shaft'îl3, thev jack shaftk |31’ >the bevel' edge ‘26’ of the casing 2| at Ythe bottom of the
gear drive I4 between said shafts" andthe_'_beviel'> latter for a. purpose presently seen.
gear |4' on the jack'shaft’l3f >alici-which form ` Y
part vof therusual driveffor the.'rotary"h<.)ok.¿orV
45
suitablyv mounted upon arñxed support 30 >at
1 the balancel Wheel end of the machine is a pair
loop taker> of 'theI well knoWnjSinger lock stitch ` of thread spindles 3| and 32 for the lower and
50
ysewing machine ofcommerce as exemplified
'n upper threads, respectively, and rotatably mount
U. S. PatentNo.'"'1,105,968 to ’which attention is v ed, in any suitable mannerfonjsaid -support 30.
directed fonamore v'complete"disclosure of _theV ' A pair of thread guides ?33 extend upwardly from
drivinginecha'nism;>
_
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‘_ n c,
‘Y
l. saidsupportß? in Yoverlyingrelation to the spin
According toïmy invention,_-?-the_- usual rotaryV `dles 3| and 32.' _A tubular arcuate thread guide
55 iliookïorïloop taker‘lBislafliXed to the forward'end
34 is suitably secured at'one end to the support
50
155l
a
2,132,892
36 to extend to an opening 35 in the rear wall
and loosely bearing against the link V53 tensions
of the housing I8 in axially alignment with the
tubular drive shaft I6. Intermediate the spindles
the latter against upward movement. Cooperat
3| and 32 and mounted on the support 30 is a pair
of thread tensioning disks 36. Thetensioning
disks v36 are relatively adjustable to impose a
variable tension upon the thread and by means
of a knurled thumb nut 31 and a tension spring 38.
The'upper thread 39 is led from the spindle
10 32 through one of the thread guides 33, to rsuit
able thread guides 40 on the arm 3 and thenY in
the usual manner around the tensioning disks l, '
ing with the pick up link 53 is a cam 62 rotat
ably mounted on the guide bar 60 subjacent said
link and adapted during each revolution to cam 5
said link upwardly, against the tension of thev
spring 6|, on the pivot 52 so that the snatch hook
54 is located above the’level of the top of the loop ‘
taker I5 as shown in dotted lines in Figure l.
Cooperating with the snatch hook 54 to cam the
same laterally isa cam lug 63 upstandingirom
the bottom 'of' the casing 2| on the inner face
through the thread take-,up lever 6 and the thread . .f thereof and for a purposepresently seen.
înfthe before described position to which the
guides 8 and 9’ to the needle I|. The lower "
thread 4| is led from the spindle 3l over and _loop 42 kis` carried by the loop taker I5 at which 15
between the tensioning disks 36, throughVVV the , point in the machine operation the needle II is
tubular thread guide 34, opening 35, tubular-shaft* nearing the limit-ofV its npstrokeposition, the
I6, and nipple 24. From the-nipple 24`said¿lower
thread 4I is led beneathV the thread tensioning'
member 25 as shown in Figure 2 and in the ini
tialthreading of the machine up through lthe
throat plate I2 in the usual manner.
The operation of the machine as so far de
scribed is as follows:
, t
t
lli/'neny the needle I Idescends a slack is created
in the upper thread 39 by operation of the thread
take-upv lever 6 so that a loep 42 may b-e formed
in the lower en_dk of the upper thread all as is
usual and well understood inthe art. The loop
KV42 is ypicked up'by thetusual hook Ao‘r beak I5' of
the loop taker I5, in the usualmanner, and car-
position of the described parts of the loop pick
up mechanism'is‘as follows. The pick up link
y53 is in the limit of its down stroke position and 20
slightly in advance of the cam 62 and loop taker
hook‘l5’. The eccentric 45 is positioned to im
part a slight forward thrust to said link 5€! upon
`initial rotation thereof, and the cam 62 is in po
sition to elevate said link 53 following upon said
forward thrust. 'I’his position of the parts is
clearly illustrated in Figures 1, 3 and 4. The ec
' centric 45 andcarn 62 are driven by the follow
' ing drive mechanism; suitably journaled in the
bearings 8, I8’ to extend at its front and rear ends :
. into the housings 44 and I9 isa driven shaft 64.
64
» rî‘he shaft
_
_ is driven by means of a jack shaft
ried part Yway around the thread guide and ten-v
'
sioning device 2 I. Asbest shown
in Figure
the y 65 suitably Journaled in the bedr plate I and arm
loop 42 is taken aroundthefront edgelß oi' thev 3 along side the jack shaft I3’ with one end geared _
' ¿combined thread guide and tensioning devicerZIl, to the drive shaft I3 by beveled gearing 66 and
that is to say, in front of the latter, and over the its other end similarly connected to the shaft
lower thread 4|, until the hook _I5’Yis inA its lower~ 64 by gearingiìl. The other end of the shaft
most position and said loop substantially vertical. 64 is operatively connected to the shaft 46 by
At this point the loop _42 is picked off `the hook beveled gearing 6.8 and to the cam 62 by a pair
40 I5’ and _carried up to a position ïsubjacent -the of gear pinions 69 and l0 ,fast on the shaft 64 40
needle Il so that upon lth'evnext down stroke of and cam 62 respectively. The described drive to
the needle thelatterwill enter theïloop to form the shaft 46 isso arranged and timedthat during
a chain stitch.- Thisv operation is effected by pick approximately the last half revolution of the
f loop taker I5 the eccentric 45 makes a complete
up mechanism now‘to be described.
y
f
The basic element of the loop pick up mecha ‘revolution and theL cam 62 a half revolution.
45
'I'he operation as regards the loop taker has al
nism (Figures 1 and 4) is an eccentric link Vmo
ready been described.Y yIt remainsnow to describe
tion 43 contained, for the greater part,'in a hous
ing 44`located beneath the throat plate I2 in ad
Vance of the combined thread guide and tension
ing device 26. Said motion 43 comprises an ec
centric 45 fast on a shaft 46 journaled, atV a right
angle to the shaft I6, in_bearings, as at 4l, ex
tending from the front wall of the housing 44, an
eccentric strap 48, and a rod 49 integral with said
the operation of the loop pick up mechanism.
At the described point in the’operation of the
loop taker I5 that is in half cycle position thereof 50
and with the loop 42 in vertical position as shown
in Figure 3 the eccentric 45 is rotated from the
position shown in Figuresll and 4 to impart a
slight forward thrust to the pickuplink 53 which
strap and extending therefrom toward said ten#
thereby enters the snatch hook 54 in said loop 55
n 49V and thrusts said hook against> the'carn 63 where
.The free `end of the` rod
extends through a guide slot 5|!l in 'aA guide bar .by said hook
cammed laterally ahead of the .
5I, in said housing 44, >whereby when thehshaft beak I5* and the loop 42 snatched ‘off said beak
sioning devicev 20.
46 is rotated the rod 49 is reciprocated toward
'I5'. VlThe link'53 and snatch hook 54 are new
and from said tensioning device 20 and at the
retracted during which operation the cam Y62 60
raises said link upwardly to the before described
Sametime oscillated vertically. Pivoted, as at
52, >on the free endy ofY the rod 49A for vertical elevated position thereof,` the >eccentric describing
swinging movement thereonv and to be recipro-> substantially 'a Vhalf revolution. The eccentric
cated thereby is a pick up link, or bar, 53 extend now executes -substantially another half revolu
ing toward the tensioning device 20 and termi- t* tion and thrusts the snatchhook 54 with the loop 65
nating at its free endvin ay down turned snatch V42 thereon belowV the needle H it VVbeing under
hook 54, pivoted thereon, as Vat 55, for lateral stood that said needle is sufliciently elevated for
y
t
swinging movement and tensioned against ysiuch l this purpose. During
this *manipulation
of the
movement by a leaf spring Y56y suitablyl secured l vloop'42'by thenlink -53 and snatch hook 54 they
70 yto said link 53, as at 51, andvhaving a slot and
pin connection 581with' said hook 54. r`The link
>loop is continuously shortenedV bythe usual ten 70
sioning operation exerted by the thread take vup _
lever Vô. Substantially coincidentally _with-loca
cally slotted guide bars r59,'a`n'df6'6l upstandling " tion of the loop Y42 beneath the needlelrl the Vlat
` » 53 is guided in its movement jby. a pair of verti
from ,the'bottom ofthe housing >44. AÍsuitable
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¿Prine @I Secured .in .the Shire-L'. .Qfï @er 'Per il?
ter descends into Ysaidloop.Í ,At` this point Ythe
@certifie f4.5 . series a .wend@_revßlutiqntreiracif
2,132,892
ing the snatch hook 54 and the eccentric 62 re
leases the link 53. At the end of the second revo
lution of said eccentric, which occurs during sub
stantially the i'lrst half cycle of revolution of the`
loop taker I5 and formation and positioning of
another loop 42 in the manner previously de
scribed, the link 53 and snatch hook 54 have been
retracted and advanced a'nd lowered by the spring
6| to the starting position previously indicated.
In the positioning` of the loop 42 beneath the
needle | l the usual chain stitch is formed as will
be obvious. However, as an incident to such po
sitioning of the loop 42 each loop is wrapped
20
25
30
35
3
and form a loop therein, and loop pick up mech
anismoperative to free the loop from engage
ment with said loop taker and to carry said loop
into a position intermediate said needleand loop
taker, and including a pick up bar mounted for
vertical swinging and reciprocatory movement, a
snatch hook on said bar swingable thereon,
means for moving said bar, and means to swing
said hook comprising a stationary cam engaged
by said hook as an incident to movement of said
bar in onedirection.
4. In a sewing machine, the combination with
a reciprocatory needle of a rotary loop taker
mounted below said needle and having an axial
opening therein, a combined thread guide and
around the lower thread 4|, or vice versa, so that
on one side of the material stitched the lower
thread is wound around the loops of the chain tensioning device comprising a cylindrical casing
as shown in Figure 5. Because of the tension _ stationarily mounted adjacent to said loop taker
effected through the medium of the tensioning axially of the latter, a tubular thread guide in
said casing axially aligned at one end with the
member 25 the chain is pulled tighter .by the low
er thread 4| than in the usual machines and opening in said loop taker, a thread tensioning i.
reinforced on one side of the material by said member on the outside of said casing to which the
lower thread. The lower thread 4| may be dis
thread extends from said guide, a thread supply
tinctively colored for ornamental purposes or ‘for from' which the thread extends through said
identifying the one side of the fabric.
y
opening and thread guide, kand means for rotat
The lower thread 4| may be inserted through ing said loop taker.
the tubular thread guide 34, tubular shaft I6 and
5. In a sewing machine, the _combination with
nipple 24 by means o-f a threading hook 12 of a reciprocatory needle, of loop forming mecha
flexible metal inserted through the parts men
nism comprising a tubular shaft rotatably mount
tioned in a manner which will be understood.
ed below said needle, a rotary'loop taker iixed
The foregoing will, it is believed, suiiice to im
on one end of said shaft adjacent said needle,
part a clear understanding of the invention but a combined thread guide and tensioning device
it is to be understood that the present disclosure including a cylindrical casing stationarily mount
is illustrative rather than restrictive and that .ed adjacent to said loop taker axially of the lat
changes in form and relation of parts described ter, a thread guiding nipple fixed in'said casing
may be resorted to falling‘within the scope of with one end thereof disposed axially of said cas
the protection prayed.
ing, a thread tensioning member on the outer
What I claim is:
face of said casing to which the thread extends
1. In a sewing machine, the combination with from said nipple, a thread supply from which
a reciprocatory needle and a source of Athread the thread extends through said shaft, looper and
supply for said needle, of a rotary loop taker be
nipple, and means for rotating said shaft.
40
low said needle operative to engage the thread
6. In a sewing machine, the combination with
and form a loop therein, and loop pick up mecha
a reciprocatory needle, of loop forming mecha
nism operative to free the loop from engagement nism comprising a tubular shaft rotatably mount
with said loop taker and to carry said loop into
45 a position intermediate said needle and loop
taker.
.
K
2. In a sewing machine, the combination- with
a reciprocatory needle and a source of thread
supply for said needle, of a rotary loop taker
ed below said needle, a rotary loop taker ñxed
on one end of said shaft adjacent said needle, a 45
combined thread guide and tensioning device in
cluding a cylindrical casing stationarily mounted
adjacent to said loop taker axially of the latter,
a thread guiding nipple iixed in said casing with
one end thereof disposed axially of said casing, 50
50 below said needle operative to engage the thread
and form a loop therein, and loop pick up mech- . a thread tensioning member on the outer face
anism operative to free the loop from engagement of said casing to which the thread extends from
with said loop taker and to carry said loop into a said nipple, a drive for said shaft including gear
position intermediate said needle and loop tak
ing, a housing for said gearing into which said
shaft extends, a tubular thread guide extending 55
55 er and including ahook member mounted for ver
tical swinging and reciprocatory movement, and
means for moving said hook member.
3. In a sewing machine, the combination with
a reciprocatory needle, and a source of thread
60 supply for said needle, of a rotary loop taker be
low said needle operative to engage the thread
into said housing into axial alignment with said
shaft, and a thread supply from which the thread
is »led to said tubular guide, shaft, and loop taker
into said nipple.
BOOKER W. DAVIDSON.
60
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