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Патент USA US3059610

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Oct. 23, 1962
H. w, RUSSELL ETAL
3,059,600
LOOPER MECHANISM
Filed Dec. 4, 1959
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United States Patent 0
11
3,059,600
LOOPER MECHANISM
,
3,059,609
Patented Oct.~23, 1952
2
1
Harvey W. Russell, Nyacis, and Richard H. Russell, Tap
pan, N.Y., assignors to Willcox & Gibbs Sewing Ma
chine Company, New York, N.Y., a corporation of
New York
Filed Dec. 4, 1959, Ser. No. 857,392
4 Claims. (Cl. 112—-200)
».
Ice
speci?cation and claims when considered in connection
with the attached sheet of drawings, illustrating one form
of the invention, wherein like characters represent like
parts and in which:
FIGURE 1 is a fragmentary side elevational view of
the looper mechanism of the invention;
FIG. 2 is a fragmentary front elevational view taken
in the direction of the arrows 2-—2 in FIG. 1;
FIG. 3 is a fragmentary sectional view of the trans
This invention relates to improvements in looper mech 10 verse looper drive taken in the direction of the ar
anisms for sewing machines and to methods for moving
rows 3~—3 in FIG. 1;
the looper relative to the needle assembly thereof. More
FIG. 4 is a fragmentary sectional view partially in
speci?cally, it constitutes an improvement over the in
elevation of the looper asseembly mount and longitudinal
vention disclosed in the patent to Russell et al., No.
looper drive taken in the direction of the arrows 4—4 in
2,834,309.
'
15 FIG. 1; and
Prior to the present invention and as seen in the
FIG. 5 is a diagrammatic illustration taken from above
aforenoted patent, looper mechanisms for cooperation
of the elliptical path the looper travels during its opera
tion.
As afo-renoted, the present invention is an improvement
with the needle assembly ‘of sewing machines were com
plicated devices including many parts which tended to
increase the operable weight of the device and slow its
operation. While prior art devices were e?icient and
served their required purpose when operating at normal
speeds, they tended to become sluggish and lost e?iciency
on looper mechanisms of the type disclosed in Patent No.
2,834,309, to which reference may be hereinafter made.
According to the invention, as shown in FIGS 1 and 2
of the drawings, the looper assembly 10 of the looper
at high speed operation, such as over 5000 rpm.
mechanism 11 is movably mounted on a looper support
The present invention overcomes the problems afore 25 12 which is pivotally carried, as at 13, by a bracket 14 on
noted and provides a looper mechanism for sewing ma
the frame 15 of the sewing machine. The support 12,
chines of reduced operable weight, which is adapted to
which is adapted to be rocked about its pivot 13 to move
operate at high speed with increased efficiency.
the looper assembly 10 longitudinally relative the needle
It is an object of the invention to provide a looper
assembly 16 of the sewing machine, includes a T-shaped
mechanism “or the like having a substantially reduced 30 post 17 having a substantially C-shaped looper assembly
number of parts, whereby the operable weight of the
device is reduced to facilitate high speed operation.
It is also an object of the invention to provide a looper
mechanism which eliminates long sliding bearings and
mounting bracket 18 removably connected to the upper
end thereof by machine screws 19, or the like. Formed
integral with the lower end of post 17 is a cylindrical shaft
bearing 20, for a purpose to be hereinafter explained, and
the like to increase the speed of operation and reduce 35 a cylindrical pivot bearing 21. The pivot bearing is
the slowing effect of friction thereon.
rotatably supported on the pivot 13, which may be a rod
Another object of the invention is to provide a looper
or the like, extending outwardly of bracket 14 and is
mechanism and method, whereby the looper is operated
retained thereon by a collar 22 in threaded engagement
in an elliptical path relative the needle assembly in timed
with the end of rod 13. The collar may be locked in
relation to the operation of the sewing machine, and in
position with respect to the rod by means of a set screw
which dwell at the end of the looper stroke is substantially
23.
reduced.
The looper assembly 10‘ includes one or a plurality of
Still another object of the invention is to provide a
loopers 24, as required, mounted on a looper carrier 25 so
looper mechanism, wherein the looper assembly is mov
as to cooperate with the needles of the needle assembly
ably carried by a pivotally mounted looper support, in 45 16. The looper carrier 25 is connected to a looper mount
which the support, in which the support is rocked about
ing shaft 26 that is slidably journaled in bearings 27
its pivot and the looper assembly is moved relative to the
formed in the ends of the arms of C-shaped looper as
support by separate means carried by the main drive shaft
sembly mounting bracket 18.
of the sewing machine so that simultaneous transverse and
In accordance with conventional practice, the looper
longitudinal movement is imparted to the looper relative 50 or loopers 24 are preferably actuated in predetermined
the needle asembly.
timed relation to the operation of the needle carrier from
Yet another object of the invention is to provide a
the main drive shaft 28 of the sewing machine so that the
method for moving a looper in an elliptical or simultan—
stitches will be properly correlated during the sewing
eous transverse and longitudinal path relative to the
operation. According to the present invention this is
needle assembly of a sewing machine, where the steps of 55 accomplished by connecting the looper support 12 to the
the method include rocking the support for the looper
main drive shaft so that it is rocked about its pivot 13 to
by operably connecting it to the main drive shaft of the
move the looper and looper assembly 1t} longitudinally
sewing machine and moving the looper relative its sup
relative to the needle assembly 16 and by separately con
port in a direction transverse to the rocking thereof by
necting the looper assembly 141 to the main drive shaft
separately connecting it to the main drive shaft.
so that the mounting shaft 26 thereof is moved relative to
It is further an object ofvthe invention to provide a
C-shaped bracket 18 and the looper is traveled in a direc
looper mechanism wherein the looper is positively moved
tion transverse to the rocking of looper support 12. It
in a simultaneous traverse and longitudinal path rela
will be understood that the simultaneous rocking of the
tive the needle assembly and in which the length and
looper support 12 in a longitudinal path relative the needle
position of the longitudinal stroke of the looper is readily 65 assembly 16 and the transverse movement of the looper
adjustable.
assembly 111 relative the support combine to travel the
It is still further an object of the invention to provide
looper 24 in an elliptical path relative the needle as
a looper assembly of simple construction, embodying but
sembly.
a relatively few parts, that is accurate at high speed opera
tion and is of such rugged character it will function over
a long period of time with freedom from all difficulty.
As shown in the drawings, looper support 12 is con
nected to the main drive shaft 28 of the sewing machine
by means of a rocker arm 29 that is rotatably carried,
in any manner known to the art, by an eccentric 30 on
Other objects and advantages will be apparent from the
3,059,600
3
the main drive shaft. The rocker arm is rotatably con
nected to a pin 31 carried by the post 17 of looper sup
port 12 and, through engagement with the pin, rocks the
4
separate operation of the component elements of move
ment forming the ellipse, facilitates the high speed opera
tion of the sewing machine by providing a sufficient looper
stroke length to achieve the desired results. The reduc
tion in dwell at the ends of the looper stroke, resulting
from the elimination of the long sliding bearing utilized
in the prior art eliminates sluggishness in the operation
of the looper mechanism at high speed and facilitates
support about its pivot 13 as the main drive shaft rotates.
As shown most clearly in FIG. 4, the rocker arm 29,
which may be longitudinally split, is provided with a
rotatable spherical bearing 29a, in the end directed away
from the main drive shaft, which is adapted to rotatably
smooth cooperative coaction between the needle assem
receive the pin 31, so that the pin is universally movable
relative to the arm to prevent binding or other inter 10 bly and the looper mechanism.
ference with the operation of the looper mechanism.
While pin 31 may be formed integral with post 17
or may be immovable relative thereto, in the illustrated
form of the invention the pin is adjustably carried in an
elongate slot 32 formed in the post and is eccentric in
shape, whereby adjustment of the length and position of
Thus, among others, the several objects and advantages
of the invention as aforenoted are achieved. Obviously
numerous changes in the structure may be resorted to
without departing from the spirit of the invention as
de?ned by the claims.
We claim:
1. A looper mechanism for sewing machines having
the longitudinal stroke of the looper may be achieved.
a
frame
carrying a main drive shaft and needle assembly
The slot 32, which is slightly arced, is substantially
operably connected to said main drive shaft comprising
vertically disposed so that the adjustment of the pin in
a looper support means pivotally connected to said frame,
the slot to shorten or lengthen the operable length of
a looper assembly movably carried by said support for
the pivot arm, or the distance between pin 31 and pivot
movement
in an elliptical path resulting from a combina
13, will lengthen or shorten, respectively, the length of
tion of an arcuate longitudinal and straight line transverse
the longitudinal stroke of the looper. The pin 31 is
movement about the path of movement of said needle
eccentric in shape, having the axis of the rocker arm
assembly in timed relation to the operation of said sewing
25
engaging portion 31a parallel to and offset from the axis
machine, a rocker arm directly connected to said looper
of the looper support engaging portion 3111. Between
support means and directly eccentrically carried by said
the portion 31a and 31b of the pin, an integral ?ange
main
drive shaft for rocking said looper support about
like washer 310 is provided for engaging the post 17 at
its
pivot
to impart said arcuate longitudinal movement
one side of the slot 32 and the end of portion 31b directed
away from portion 31a is adapted to removably receive 30 thereto, separate pivotal means connected to the looper
assembly, eccentric means connected to the main drive
a Washer 31d and is threaded for engagement by a nut
31e, which facilitates locking the pin in adjusted position
in slot 32. It will be seen that, in addition to the adjust
ment of the length of the longitudinal stroke of the
looper, the position of the path of travel of the looper
may be adjusted by rotating the eccentric pin 31 in the
slot 32 so that the rocker arm engaging portion 31a is
farther or nearer to the main drive shaft 28 of the sewing
shaft and said separate means to oscillate the separate
means about its pivot for imparting transverse movement
to the looper assembly relative to the support, and means
for controlling said looper assembly to maintain said
straight line movement of the assembly during said trans
verse movement thereof.
2. A looper mechanism for sewing machines having
a frame carrying a main drive shaft and needle assembly
machine, whereby the entire path of travel of the looper
is shifted relative the needle assembly, respectively, to 40 operably connected to said main drive shaft comprising
a looper support means pivotally connected to said frame,
ward or away from the main drive shaft.
a looper assembly ‘movably carried by said support for
The looper assembly 10, which as aforenoted, is
movement in an elliptical path resulting from a combina
adapted to be moved transversely of the looper support
tion of longitudinal and transverse movement about the
12, is connected to an eccentric 33 on the main drive
path of movement of said needle assembly in timed rela
45
shaft 28. As shown, a shaft 34 rotatably carried in
tion to the operation of said sewing machine, a rocker
cylindrical shaft bearing 20 of looper support 12 is con
arm having an adjustable pin and slot connection to said
nected to the looper mounting shaft 26 through a yoke
looper
support means and directly eccentrically carried
35 having a drum 36 rotatably carried in the upper end
by said main drive shaft for rocking said support means
thereof. The drum 36 is connected through a pin 37
about its pivot to impart said longitudinal movement
to a clamp 38 adjustably connected to the looper mount 50
ing shaft 26.
The yoke 35, while it may be formed
integral with shaft 34, is shown as being mounted on an
end of the shaft and locked thereto by means of a set
screw 39. The opposite end of rotatable shaft 34 is
connected to the ecnentric 33 of the main drive shaft to
be rotated thereby. As seen most clearly in FIG. 3 a
link 40 has one cut thereof connected to the shaft, as
by a split clamp connection or the like, and has its other
thereto, separate means connected to the looper assem
bly, and eccentric means connected to the main drive
shaft and the separate means to oscillate the separate
means for imparting transverse movement to the looper
assembly relative to the support.
3. A looper mechanism for sewing machines having a
frame carrying a main drive shaft and needle assembly
operably connected to said main drive shaft comprising
a looper support means pivotally connected to said
end connected by means of a ball and socket connection
frame, a looper ‘assembly movably ‘carried by said sup
shown at 41, to an arm 42 rotatably carried by the 60
port
for movement in an elliptical path resulting from
eccentric 33 of main drive shaft 28. It will be seen that
a combination of longitudinal and transverse movement
as main drive shaft 28 rotates, rotary movement is im
about the path of movement of said needle assembly
parted to shaft 34 through arm 42 and link 40 whereby
in timed relation to the operation of said sewing ma
yoke 35 is reciprocated to move looper mounting shaft
chine, a rocker arm directly eccentrically carried by
26 and consequently looper 24 back and forth transverse
said main drive shaft and having a connector including
to the path of movement of looper support 12.
a pin cooperating with a ball joint in said rocker arm
Referring now to FIG. 5, wherein the path of travel of
and
eccentric to an adjustable pin and slot connection to
looper 24 is diagrammatically shown, it will be seen that
said looper support means for rocking said support
the combined longitudinal and transverse movement of
the looper, as provided by the combined separate rocking 70 means about its pivot to impart said longitudinal move
ment thereto and for adjusting the position and amount
of the looper support 12 and shifting of looper assembly
of longitudinal movement of said looper ‘assembly, sepa
10 relative to the support, causes the looper to move, in
rate means connected to the looper assembly, and ec
the direction of the arrows, in an elliptical path having
centric means connected to the main drive shaft and the
minimum dwell at the ends of the stroke. The elongate
elliptical path of travel of the looper, resulting from the 75 separate means to oscillate the separate means for im
8,059,600
5
parting transverse movement to the looper assembly rela
tive to the support.
4. A looper mechanism for sewing machines having a
frame carrying a main drive shaft and needle assembly
operably connected to said main drive shaft comprising
a looper support means pivotally connected to said frame,
a looper assembly including a looper mounting shaft slid
ably mounted in aligned bearings on the support means,
a looper carrier movably carried by said mounting shaft
and adapted to be moved in an elliptical path resulting 10
means connected to the looper assembly, eccentric means
connected to the main drive shaft and the separate means
to oscillate the separate means, and a pin operating in a
slotted pivoted drum connecting the separate means to
the looper mounting shaft for imparting straight line
transverse movement to the looper assembly relative to
the support.
References Cited in the ?le of this patent
UNITED STATES PATENTS
from a combination of longitudinal and transverse move
ment about the path of movement of said needle as
580,015
Staples _______________ __ Apr. 6, 1897
sembly in timed relation to the operation of said sewing
903,749
Miller ______________ __ Nov. 10, 1908
machine, a rocker arm directly connected to said looper
support means and directly eccentrically carried by said 15
main drive shaft for rocking said support about its pivot
to impart said longitudinal movement thereto, separate
1,190,959
Seymour _____________ __ July 11, 1916
2,834,309
Russell et a1. _________ __ May 13, 1958
888,199
Germany ____________ __ Aug. 31, 1953
FOREIGN PATENTS
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