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Патент USA US2121689

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June 2ï, 1933-v
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F. EBER-r
>SEWING' MACHINE WITH'LOOPER THREAD CONTROL
Filedmugfle, 1936I
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5 sheets-sheet 1
June 211, w3.
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2,121,689
SEIWINCï` MACHINE WITH LOOPER THREAD CONTROL
Filed Aug. Vla, 1936
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l2,121,689
F. EBERT
SEWING MACHINE WITH4 LOOPER ‘THREAD CONTROL v’
Filed Aug. 18, 1936
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June 21,193.
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Filed Aug. 18,- 1936
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5 Sheets-Sheet 4
2,121,689
Patented` June 21, 1938
UNITED STATES
PATENT OFFICE I
2,121,689
ì
SEWING MACHINE wl'rn LooPEa THREAD
-
coN'r
ROL
Fritz Ebert, Oberndorf-on-the-Neckar, Germany,
assignor to Manset-‘Werke A.-G., Oberndorf
on-the-Neckar, Germany, a joint-stock com
pany of Germany
Application August 18, 1936, Serial No. 96,680
In Germany September 2, 1935
(Cl. i12-_241)
13 Claims.
This invention relates to a sewing machine
» with looper thread control and take-up device,
and has for its object to control the looper thread
in such fashion that the same is in a tensioned
condition in every phase of the sewing operation.
For this purpose, in accordance with the in
vention, a control element in conjunction with
the pull-off means and a thread clamping means
co-operates in such fashion with a cast-off and
li) thread guides that the looper thread is stored
by the control element immediately it is released
by the looper .or the pull-off means.
The con
trol element preferably comprises two curved por
tions, each of which oscillates between a fixed
chine frame for the main feed, by means of a
connecting rod which is adjustable in length, in
which connection the time of clan ping and the
amount of pressure applied to the two springs
may be varied. yProvision is also made for an`
additional possibility of regulating the thread
clamping means by an adjustable screw, which is
located at the- effective end of the rockinglever.
The arrangement as described acts particularly
favourably by the fact that owing to a gentle 10
regulation of the thread and extensive adapta
tion to the particular thread employed the ma
chine may be operated at a higher speed and
with diminished tendency to breakdown even in
thread guide and the fixed cast-off. The curved
the case of an inferior thread.
members are moved in common by a lever, which
conjunction with a sewing machine of the sup
In the drawings the invention is illustrated in
1s mounted on an intermediate spindle that at the
same time acts as operating spindle for a cutting porting arm type having a cutting device. It is,
however, not limited to machines of this descrip
device provided on the machine.
tion, but may be applied literally to any desired
According to an additional feature of the in
vention, the pull-off device for withdrawing the type of sewing machine having a looper mecha
.
«
thread from the source is united in such fashion nism.
In the drawings
Y
.
with the looper thread control device that the
Fig. 1 is4 an elevation in partial section of the
lever operating the curved members at the same _
time actuates the pull-off means, a pull-off `hook frame of a sewing machine furnished with a
being mounted on the lever to be adjustable. cutting device, with an arm enclosing the looping
This hook swings between two fixed thread eyes. device.
Fig. 2 is a cross-section of the arm taken along
The cast-olf and the thread guides are adjust
able independently of each other for the purpose the line II-II in Fig. 1.
Fig. 3 is a plan view of Fig. 1, partly- in section,
30 of being able to regulate the quantity of thread with the top of the arm removed.
takenup by the curved members. To facilitate
Fig. 4 shows a detail of the looper thread con
the introduction of the thread into the thread
guides the> latter are provided on a stirrup, which trol.
Figs. 5 to 16 illustrate the function of the looper
is furnished with a handle-like abutment and is
capable of being rocked out of the range of the thread control and take-up mechanism according
pair of curved members and the cast-oit. In the to the invention in four «"iïerent positions, Figs.
operative andthe inoperative positions the stir
20
25
30
35
5, 8, 11, and 14 showing the devices themselves,
whilst to facilitate comprehension Figs. 6, 9, 12
rup is locked by a spring or the like moving into
a notch. In the operative' position the stirrup and 15 are front views of the particular needle _
may
also be readjusted in its elevation. In ‘ and looper' positions corresponding with Figs. 5,
40
order that when the stirrup is moved over the 8, 11 and 14. Figs. 7, 10, 13 and 16 are the ap
threaded looper thread is immediately conducted pertaining needle and looper positions ’viewed
from the side, partly in section.
.
into the correct position with respect to the cast
In the frame i of the sewing machine there is
oiî and does not become intercepted, there’is
provided on the cast-off a horn which guides the mounted ,the main shaft 2 which is furnished
thread accordingly.
'
,
The thread clamp co-operating with the looper
thread control means ensures that upon the tak
ing up of thread from the source thread is also
not withdrawn. by the control element. The
thread clamp conveniently comprises two fixed
, springs,which are compressed rhythmìcally during
the sewing operation by the end of a _rocking
lever. The rocking lever is operated by an in
55 termediate sham, which is provided in the ma
with a hand-wheel 3 and’drives the needles
through the medium of a device of desired kind
(not shown). From the main shaft 2 there is
also derived the drive for the looper and the ma
terial feeder, which drive, since the same may
be of the usual construction, will not be particu- -
larly described. Further, the main shaft 2 also
drives in immediate fashion the mechanism for
actuating the cutting device. For this purpose
there is provided on the main shaft an eccen
2
2,121,689
tric 4 having a lever arm 5 which is engaged
through the medium of a spherical screw 6 by a
link 1, the other end of which is connected by>
thread-tensioning springs 32 and 33 tlrmiy
way of a spherical screw 8 with a lever I8 se
cured to a spindle 9. _ The spindle 9 is mounted
pressed together for ñrmly holding the thread.
in a bearing block
arm Il, performs
by the lever IIJ and
the cutting device
I2 secured to the supporting
the ~oscillations transmitted
accordingly acts as drive for
provided in the supporting
10 arm.
According now to the invention, the drive for
' the looper thread control is also derived from the
spindle 9. A lever I3, which in the same manner
as the lever I8 serves as collar to limit the lateral
movement of the spindle 9, is mounted on the
spindle 9 in such fashion that it participates in
the oscillations of this spindle. At the free end
of the lever- I3 there is guided yand securedon
either side in a groove I4 a curved member I5 and
I6, -which members control the looper thread in
a manner which will be described more fully
later. The curved members are so constructed
that the thread sliding along the curve cannot be
intercepted. For this purpose both curved mem-.
bers possess at their upper end a projection I1,
whichV prevents the thread from falling on to
wards the rear. The intermediate space of these
two curved members is engaged by a cast-olf
I8, which is ñrmly secured to the supporting arm
II and can be adjusted only in the longitudinal
direction, the same projecting to a greater or
smaller extent into the space between the curved
members. On the supporting arm II there is
also provided aA holder I9 which is likewise ad
justable and ñxable in the longitudinal direction,
and on this holder I9 there is mounted a lever
20 carrying a stirrup 2I having two thread eyes
22, which stirrup engages about the curved mem
v bers I5 and I6 and the cast-off I8. 'I'he lever 28
may be rocked upwards about the pin 23 and is
held both in the operative position as well as in
the oscillated position by a notch engagement
which may comprise a spring snapping into
either the notch 24 or the notch 25. r By the rock-'
ing of the stirrup 2l out of the range ‘of the
curved members and the cast-01T into the vertical
position the threading of the yarn in the thread
guide is greatly facilitated, and for the purpose
of better manipulation the one arm of the stir
rup possesses a handle-like abutment 28. In the
horizontal operativeposition the lever 20 is made
to be adjustable by means. of a regulating screw
21 provided thereon, which bears against a iixed
portion of the supporting lframe. In order now
to prevent the thread passed through'the eyes
22 from being caught against the cast-oil’ when
the stirrup 20 is moved over the cast-oil” is fur
nished with a horn 28 which guides the thread
along the cast-off and causes it to move into the
proper position.
>
'I‘he thread pick-up lever I3 carries at the
same time"the device for drawing oii’ the looper
-
thread from the source. A thread pull-off hook
29, which is mounted to be adjustable and ñxable
in an eye 30 in the lever I 3, co-operates by means
of its free end with two thread eyes 3I provided
on the supporting arm II. the same performing
>with the lever I3 an oscillatory movement by
means of which the thread is drawn oil’ from
the source.
'I'he hook 29 accordingly acts as
preliminary take-up means. In order to prevent
this preliminarytake-up means from also draw
ing oiî thread from the looper there is provided
between the hook and the control curve 4a thread
.' clamping~means 'whichis ,constituted by two
mounted on the frame I, between which there
passes the looper thread and which may be
'I'he drive for the mechanism is derived from an
intermediate shaft 34, on which there is mounted .
a lever 35 that operates through vthe medium of
two spherical screws 36 and a longitudinally ad
justable connecting rod 31 having a left and right
hand thread, a double lever 38 which rocks about 10
a bolt 39 'mounted in the supporting arm II.
With its free end the double lever 38 presses at
the proper time the thread tensioning spring 32
against the thread tensioning spring 33, the in
termediately disposed thread being so clamped 15
that no thread can be withdrawn from the looper.
An adjustment screw 40 on the free end of the
double lever 38 permits of a fine adjustment, by
means of which the relative pressure of the ten
sioning springs may be regulated, and the ad 20
justment screw is held in position by a screw 4I.
Behind the thread clamp there is provided an
additional eye 42, which may be integral with
the eyes 3|.
'
The looper thread 43 is conducted from the 2.5
source through the tube 44 to the eyes 3l, be
tween which there swings the hook 29 of the
preliminary take-up means, and passes through
the thread clamp to the eye 42,~from where it
reaches the eyes 22 of the stirrup 2I and is then 30
conducted to the looper. The looper thread con
trol means operates, therefore, according to the
invention as follows:-
.
' Proceeding from the position of the needles and
the looper as shown in Figs. 5 to 7, the lever I3, 35
upon the reversal of the needles from their lowest
position, whereby the looper has reached its ex
treme left hand position and again swings to
wards the.` right, is also at the point of reversal
of its oscillatory movement. In this position 40
thread has been drawn off from the source by
the -pullzàofî means 29 and the thread clamp has
again been opened. The two curved members I5
and I 6 commence to swing upwards, and in co
`operation with the cast-off I8 and the two thread
eyes 22 they take up the thread released by the
looper and the pull-01T means until the looper
thread has reached the extended position (Fig.
10). On its additional movement towards the
right (Fig. 9) the looper no longergives oil' 50
thread but from this point on uses thread. In
the meantime the lever I3 continues to swing
upwards with the two curved members (Fig. 8),
the pull-oiî means letting ofi’ a certain amount
o1' thread. At the end of the upwards movement 55
of the lever I3 it then releases an additional
amount of thread for the looper by way of the
curved members I5 and I 6 (Fig. 11), at which
point both the needles as Well as the looper have
reached their extreme positions (Fig. 12 'and 60
Fig. 13). 'The needles again move downwards,
the looper swings to the left, and the thread
pick-up lever I3 with the curved members like
wise swings downwards. The thread which is
again liberated upon the return of the looper is
taken up by the curved members I5, I6. For this
purpose the proñle of the cast-oil I8 is so formed
on the inside that the thread remains hanging
on an upper hump of the cast-oil’ (Fig. 11) until
it slides in front of the foremost projectory part 70
of the curved member, i. e., all thread released
by the looper has been taken' up by the curved
member. It is not until then that the thread
upon additional movement of the lever I3 down
wards is pressed against the lower side of the 75
2,121,689 '
projection (Fig. 14). In the meantime the looper
thread has again reached an extended position
(Figs. 15 and Á16), and upon its additional move
ment towards the left it commences to consume
the thread stored by the curved members, where-`
_ by the curved members release the thread ac
cordingly. Upon the commencement of the
downward movementI of the lever I3 the pull-oli'
hook 29 in respect of the pull-off means enters
l0
into operation, whereby the- thread clamp 32, 33
is closed and ñrmly 'holds the thread disposed
between the same, so that the preliminary pull
off means can only draw. off new thread from the
source. Initially the thread remains hanging
15 against the lower side of the projection on the
cast-off I8 until upon the additional downwardl
movement of the lever I3 it is again able to swing
upwards by reason of the receding profile of the
curved members I5 and I6 (Fig. 5) and remains
hanging against the upper side of the hump on
the cast-off I8. The movement of the looper to
. wards the left (Figs. 15, 6) has consumed the
thread‘liberated by the curved members.
The co-operation of the two curved members
I5 and I6 and the cast-01T I8 within the thread
guides 22 of the stirrup accordingly takes-place
by reason of the form of the curved members
and the cast-off in such fashion that the looper
thread is subjected t‘o a slight tension in every
30 position of the looper, i. e., at no time sags and
is able to be caught at any point.
Having now particularly described and ascer
tained the nature of my said invention, and in
what manner the same is to be performed, I de
clare that what I claim is:`
, 1. In a sewing machine, a looper, a preliminary
pull-off means for the looper thread, a thread
clamp, a fixed cast-off and thread guides, and a
control element in conjunction with the said pull
40 ofï means and the thread clamp comprising two
curved portions each adapted to oscillate between
the said cast-oftand a fixed thread guide, and a
transverse axle having a lever on which the con
trol element and the pull-off means are mounted,
the said pull-off means 'being driven bythe oscil
latory motion of the said lever.
2. In a sewing machine, a looper, a preliminary
pull~oiï means for the looper thread, a thread
.
f
3
axle having a lever on which the control element
and the pull-oiî lmeans are mounted, the said v .
cast-off and thread guides being adjustable inde
pendently of each other in the longitudinal direc
tion for the purpose of varying the regulation
of the looper thread.
_
5. In a sewingmachine, a looper, a preliminary
pull-off means for the looper thread, a thread
clamp, a fixed cast-off, a stirrup, thread guides >
10
ing the said stirrup in height, a control element
in conjunction with the said pull-off means and
the thread clamp co-operating with the said cast
oif and thread guides, and a transverse axle hav
ing a lever on which the control element and the 15
pull-off means are mounted, the said control ele
mounted on the said stirrup, a screw for adjust
ment storing the thread immediately it is released
by the said looper or preliminary pull-off means
to prevent it from sagging.
- 6. In a sewing machine, a looper, a preliminary 20
pull-oiï means for the looper thread, a thread
clamp, a fixed cast-01T and thread guides, a con
trol element in conjunction with the said pull-off
means and the thread clamp comprising two
curved portions each adapted to oscillate be 25
tween the said cast-oiï and a ñxed thread guide,
a transverse axle having a lever on which the
control. element and the pull-off means are
mounted, a stirrup supporting the said thread
guides and disposedv normally within range of 30
the said curved members and the said cast-off
but capable of being rocked out of this position
to facilitate‘threading of the guides, and a han
dle-like abutment for manipulation >of the said
stirrup.
'
'
35
7. In a sewing machine, a looper, a preliminary
pull-off means for the looper thread, a thread
clamp, a,ñxed cast-oí and thread guides, a stir
rup supporting the said thread guides and mov
able to operative and inoperative positions, a
control element in conjunction with the said
pull-off means and the thread clamp co-operat
ing with the said cast-oiî and thread guides,
a transverse axle having a lever on which the
control element and the pull-01T means are 45
mounted, and means for locking the said stirrup
in its operative and inoperative positions.
,
8. In a sewing machine,` a looper, a preliminary
clamp, a ñxed cast-off and thread guides, and pull-off means for the looper thread, a' thread
a control element in conjunction with the said clamp, a fixed cast-off, a stirrup, thread guides 50
pull-01T means and the thread clamp comprising mounted on the said stirrup, a. control element
in conjunction with the said pull-off means and
two curved portionsleach adapted to oscillate be
tween the cast-olf and a fixed thread guide, a
transverse axle having a lever on which the con
trol element and th‘e pull-off means are mounted,
and a pull-off hook on the said lever co-operating
with two fixed thread eyes.
3. In a sewing machine, a looper, a preliminary
- pull-ofi` means for the looper thread, a threadA
60 clamp, a fixed cast-off and thread guides, and a
control element in conjunction with the said pull
oif means and the thread clamp comprising two
the thread clamp comprising two curved portions ‘
each adapted to oscillate between the said _cast
oiî and a ,fixed thread guide, a transverse axle 55
having a lever on which-the control element and
the pull-ofïmeans are mounted, the said stirrup
being disposed normally within range of the
said curved members and the said cast-off but
capable of being rocked out of this position to 60
facilitate threading of the guides, and a spring
co-operating with a notch for locking the said
curved portions each adapted to oscillate between
stirrup in its operative and inoperative positions.
the said cast-off and a fixed thread guide, a
transverse axle having a levergon which the con
trol element and the pull-oiî means are mounted,
clamp. a ñxed cast-off and thread guides, a con
a longitudinally adjustable pull-off hook on the
saidlever, and a screw for securing the said hook
in its adjusted position.
,
4. In a sewing machine, a looper, a preliminary
pull-oil means for the looper thread, 'a thread
clamp, a castîetï and thread guides, and a con
trol element in conjunction with the said pull-off
means and the thread clamp co-operating with
the said cast-off and thread guides, a transverse
9. In a sewing machine, a looper, a preliminary
pull-off means for the looper thread, a thread 65
trol element in conjunction with the said pu11-.
olf means and the thread clamp comprising two
curved portions each adapted to oscillate between
the said cast-off and a fixed thread guide, a 70
transverse axle having a lever on which the con
trol element and the pull-oiî means are mounted,
a stirrup supporting the said thread guides and
disposed normally Within range of the said curved
members and the said cast-off but capable of
7.5
4-
_
2,121,689
being rocked out of -this position to facilitate
threading of the guides, and a guiding horn on
the said cast-off for correctly placing the‘ thread
when the said stirrup is moved into the operative
position.
y
»
10. In a sewing machine, a looper, a prelim
inary pull-oiî means for the looper thread, a
thread clamp comprising two springs secured /to
çthe frame of the sewing machine and a lever
10 pressing the said springs together, a cast-off and
thread guides, a control element in conjunction
with the sa‘id pull-oil? means and the thread
clamp co-openating with -the said‘cast-oiî and
thread guides# the said control element storing
the thread immediately it is released by the said
looper or preliminary pull-off means to prevent
it from sagging and a transverse _axle having a
lever on which the control element and the pull
ofE means are mounted.
20
‘
Y
11. In a sewing machine, a looper, a prelim
inary pull-oir means for the looper thread, a
thread clamp comprising two springs secured
to the frame of the sewing machine and a rocking
lever pressing the said springs together, a con
25 necting rod connecting the said rocking lever
with a main shaft of the sewing machine, a cast
oiî and thread guides, and a control element in
conjunction with the said pull-off means and the
thread clamp >and co-operating with the said
30 cast-oiî and thread guides, a Ytransverse axle hav
ing a lever on which the control element and the
pull-ofi` means are mounted, and means for vary
ing the time of clamping and the amount of pres
sure exerted by the said lever on the said springs;
12. In a sewing machine, a looper, a prelim
inary pull-ofi' means for the looper thread, a
thread clamp comprising two springs secured
to the frame of the sewing machine and a rocking
lever pressing the said springs together, a con
necting rod connecting -the said rocking lever
with a main shaft of the sewing machine, a cast
oiï and thread guides, a control element in con
junction with the said pull-oir means and the
thread clamp co-operating with the said cast-olf 10
and thread guides, and a transverse axle having
a lever on which the control element and the
pull-off means are mounted, the said connecting
rod being longitudinally adjustable for the pur
pose of varying the time of clamping and the 15
amount of pressure exerted by the said lever on _
the said springs.
~
n
13. In a sewing machine, a looper, a prelim
inary pull-off means> for the looper thread, a
thread clamp comprising two springs secured to 20
the frame of the sewing machine and a rocking
lever pressing the said springs together, a longi
tudinally adjustable connecting rod connecting
the said rocking lever with a main shaft of the
sewing machine, a cast-off and thread guides, a 25~
control element in conjunction with the said pull
oiî means and the thread clamp co-operating
with the said cast-01T and the thread guides, a
transverse axle having a lever on which the con
trol element and the pull-oir means are mounted, 30
a regulating screw' on the said rocking lever for
iine adjustment purposes, and a second screw
locking the said ñrst screw.
-
'FRI'I'Z EBERT.
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