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Патент USA US3062172

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Nov. 6, 1962
3,062,162
T. A. KESTELL ET AL
SHUTTLE DRIVE FOR SHOE SEWING MACHINES
2 Sheets-Sheet 1
Filed March 31, 1961
F429 1
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Inventors
Thomas A. Kesi-e ll
Gerald 1? Ward
By iheir/ltforney
Nov. 6, 1962
T. A. KESTELL ETAL
3,062,162
SHUTTLE DRIVE FOR SHOE SEWING MACHINES
Filed March 51, 1961
2 Sheets-Sheet 2
0 20 40 60 80 I00 120 140 160 I80 200 220 240 260 280 300 320 340 360
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United States; Patent 0
3,062,162
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Patented Nov. 6, 1962
2
1
sewing shaft and another of which is connected to the
shuttle driver, the machine being provided with motion
3,062,162
Claims priority, application Great Britain Apr. 27, 1960
9 Claims. (Cl. 112—-38)
modifying means acting periodically on the third mem
ber of the epicyclic gear to speed up the shuttle driver
as each loop of needle thread is engaged by the shuttle.
With such mechanism the motion modifying means is
more readily controllable for the purposes intended and
is less subject to undesirable inertia effects and other un
This invention relates to improvements in shuttle driv
ing mechanisms for lock stitch shoe sole sewing machines
and, as hereinafter exempli?ed, the machine is of the
type illustrated in United States Letters Patent No.
readily adjustable time to retard the shuttle driver and
to permit the shuttle to overrun the driver, momentarily
SHUTTLE DRIVE FOR SHOE SEWING MACHINES
Thomas Aubrey Kestell and Gerald Frank Ward, Leices
ter, England, assignors to United Shoe Machinery Cor
. poration, Boston, Mass, a corporation of New Jersey
Filed Mar. 31, 1961, Ser. No. 99,912
desirable reactions, especially after wear has produced
looseness in the operating parts. As hereinafter illus-.
trated, the motion modifying means acts periodically at a
forming between the driver and the heel of the shuttle a
2,056,670, granted October 6, 1936, upon application of
15 gap through which each loop of needle thread engaging
J. Gouldbourn et al.
the shuttle may pass freely. Preferably, the motion
The machine of the patent is provided with a curved
modifying means comprises an oscillating lever connected
hook needle and other stitch forming and work feeding
to the ring member of the epicyclic gear. In this feature
devices, including a thread measuring mechanism for
of the invention a releasable connection is provided be
drawing off from a supply of needle thread an amount
tween the oscillating lever and the ring member of the
su?icient for each stitch, a rotary shuttle having a beak
epicyclic gear, so that in case the thread is jammed be
which enters into and carries each loop of needle thread
tween the shuttle and its supporting raceway, no damage
about a bobbin thread case mounted within the shuttle
to the shuttle driving means occurs. In its speci?c em
and a take-up operating to draw the needle thread from
bodiment the releasable, connection takes the form of a
the shuttle into the work and‘to set the point of interen
gagement between the needle and locking thread secure 25 spring loaded arm having a projection and notch engage
ment with the ring member.
ly within the work. The shuttle of the patented machine
is rotated two complete revolutions in each sewing cycle
by a system of gearing and shafts operated from the
main sewing shaft of’ the machine. The system includes
,
‘
These and other features of the invention, as hereinafter
described and claimed, will be apparent to those skilled
in the art from the following detailed speci?cation and
a shuttle shaft which is divided and is referred to in the
the annexed drawings, in which:
patent as shuttle shaft 45 (FIG. 31), having ‘two offset
portions coupled together by means of a drag link con
nection. The drag link connection is so arranged that
tions of actuating mechanism for a shuttle driver in a
machine embodying the features of the present invention;
FIG. 2 is a detail view in front elevation of a shuttle
the speed of the shuttle is increased momentarily as each
and its associated stitch forming and work feeding devices
located about the sewing point in the machine containing
the shuttle actuating mechanism depicted in FIG. 1;
loop of needle thread is engaged therewith, so that the
shuttle travels at a speed equal to about three rotations
in each sewingcycle, thereby allowing more time in each
sewing cycle for the-other stitch forming devices to func
tion and the other ‘parts of the machine to operate at an
increased speed without affecting the shuttle driving
mechanism adversely. The drag link connection also
causes a driver engaging the shuttle to slow down after
each needle loop reaches a position of greatest extension
on the shuttle in readiness to be withdrawn therefrom,
so that the shuttle has a tendency to overrun the driver
until the throat or root of the shuttle beak engages the
driver. At the opposite side of the driver between the
driver and the shuttle heel there is then produced a gap
'
FIG. 1 is a sectional view in left side elevation of por
FIG. 3 is a side sectional plan of some of the portions
of the machine shown in FIG. 1;
40
FIG. 4 is a sectional view on an enlarged scale, the
section of which is taken along the line IV-—IV of FIG;
3; and
1
FIG. 5 is a time chart representing the operating relaL
tionships between certain of the stitch forming devices
of the machine.
'
'
The illustrated machine is a curved hook needle lock
stitch shoe sole sewing machine intended primarily for
attaching outsoles to welts of Goodyear welt shoes. Ex;
cept as hereinafter described, the machine is the same
through which the needle loop may pass freely asit is
50 as that disclosed in the Gouldbourn et al. patent, above
being withdrawn from the shuttle.
identi?ed.
While the drag link connection of the prior patent
Thestitch forming and work feeding devices of the
produces adequate results, after substantial wear has
taken place there has been a tendency for lost motion to
appear in the connections between the two shafts limiting
machine include a curved hook needle indicated at 2'
(FIG. 2), a shuttle 4, lwhich after engaging a loop of
needle thread carries the loop about itself and a locking
thread supply case 6 rotatably mounted within the shuttle;
the stitching.
"
a loop spreader or thread lifter 8 for opening up‘ and
The objects of the present invention are generally to ‘
for presenting each loop of needle thread to the shuttle,
improve a lock stitch shoe outsole sewing machine hav
a looper 10, a thread ?nger .12, a work support 14, and a
ing suitable driving connections for the driver of a rotary
shuttle, to impart to the shuttle a motion, the- speed of 60 presser foot 16. The shuttle is of the usual construction
and is provided with a needle loop engaging beak 18 at
which can be accelerated or retarded more readily and
one side of a throat and a heel 20 at the other side,
in a manner whereby the introduction of undesirable
the operating speed of the machine, and the quality of
inertia effects may be minimized more effectively and in
within which throat an arcuate arm 21 of a driver 22 is
disposed loosely to engage and actuate the shuttle and
the extent of acceleration and retardatiton are more con
65 to enable the needle loop to slide between the driver and
veniently adjusted than heretofore.
'
the surfaces of the shuttle throat Without damage to the
_ With the above objects in view there is provided in
thread or obstruction to its movements about the shuttle.
the illustrated machine a shuttle driving mechanism com
The shuttle driver 22 is secured to the forward end of
prising a rotatable shuttle driver arranged to be driven
from the main sewing shaft through the action of an 70 a horizontal shaft at 24 and rotation of the driver shaft
is derived from a main sewing shaft 26 (see FIG. 3) cor
epicyclic gear, having sun, planet carrier and ring mem
responding to the shaft 15 in the above-identi?ed patent,
here one of which members is connected to the main
' 3,062,162
3
4
The sewing shaft 26 has ?xed to it a bevel gear 28 (FIG.
3) meshing with a similar gear 30 secured to the lower
shuttle driver to be rotated through the epicyclic gear
end of a short vertical shaft 32.
The shaft 32 is ro
tated at the same speed as the main sewing shaft and has
mounted on its upper end a spiral gear 34 (similar to the
gear 43 of the prior patent). The spiral gear 34 meshes
with a corresponding gear 36 which is secured to a driving
shaft 38.
In the machine of the prior patent, above identi?ed, the
shaft corresponding to the present illustrated shaft 38 acts
at a three-to-one ratio, the movement of the ring gear
also being controlled by the motion modifying means.
Such arrangement is not only readily adjustable and con
trollable but its adjustment may be kept entirely inde
pendent of the critical positions of the shuttle required
for successful sewing operations. For instance, in the
positions of the shuttle in which its beak 18 engages a
loop of needle thread and at which the loop carried by
the shuttle is freed from engagement with the shuttle
through a drag link connection to increase and decrease 10 there is no necessity for change so long as the motion
the speed of rotation of the shuttle driver or output
shaft 24 with respect to the rotary speed of the sewing
shaft 26. If it is necessary to make any change in the
extent of relative speed between these shafts it is dif
ficult to maintain the proper timed relationships between
the movements of the driver and the shuttle for easy pas
sage of each needle loop through the gap between the
driver and the extremities of the shuttle throat. Such
dii?culty is particularly annoying after wear in the parts
of the driving connections for the shuttle driver.
modifying means is adjusted to restore the normal driving
relationship between the input and output shaft of the
epicyclic gear. Such independence of actual motion
from timed relationship with critical positions of the
shuttle is not possible with a drag link connection, since
an adjustment of the length of the drag link necessarily
causes a change both in motion and timed relationship
between the shuttle and others of the stitch-forming de
vices.
To actuate the motion modifying connections the lever
52 has a downwardly extending arm to which is pivotally
a drag link connection, the shaft 38 constitutes the input
connected an eccentric strap 66. The strap 66 surrounds
shaft of an epicyclic gear, the output of which is the
an eccentric 68 secured to the input shaft 33. Upon
shuttle driver shaft 24. The gears 34 and 36 are of such
25 rotation of the eccentric ‘there is imparted to the lever 58
ratio that the input shaft 38 is driven at the same speed
a rocking motion to cause the ring gear 44 to shift
as the main sewing shaft 26.
through a limited angular movement depending upon the
According to the present invention, instead of utilizing
The epicyclic gear comprises three members (FIG. 4),
a sun 40, a carrier or spider for three planets 42 and a
eccentricityvof the eccentric. By this arrangement the
relative movement between the shuttle and its driver 22
ring or annulus 44 having internal gear teeth within its 30 is directly dependent upon the eccentric employed.
Thus,
a simple and effective construction for controlling this
movement is provided.
Assuming that the shuttle driver shaft 24 is rotated in a
the ring gear 44- and also with teeth on the sun gear 40,
counterclockwise direction, indicated by the arrow in
the input shaft 38 and the output or driver shaft 24 being 35 FIG. 4, then the effect of moving the ring gear 44 in a
arranged in alinement one with the other. The gear ratio
clockwise direction by the arms 55 as they are actuated
of the parts consisting of the ring gear 44, the planet
by the rotation of the eccentric 68, will cause the epicyclic
periphery. The planet carrier member is indicated at
46 and is secured to the forward end of the input shaft
38. The planet gears 42 mesh with the internal teeth on
carrier 46 and the sun gear 40‘ is such that for every single
gear to impart to the shuttle driver shaft a deceleration
revolution of the input shaft 38, the output or driver shaft
which assists in the formation and preservation of the
24- completes three revolutions. To this end the ring 40 gap ‘through which the loop of needle thread is drawn
gear 44 is formed with sixty teeth on its inner periphery,
in setting a stitch. In other respects the driving connec
each planet 42 has ?fteen teeth and the sun gear 40 is
tions for the shuttle are the same as in the prior patent,
formed with thirty teeth. The ring gear 44 is rotatably
except that there is also provided on the input shaft 38 a
supported on the input shaft 38 by means of ball bear
cam 70 (FIGS. 1 and 3) which performs a duty similar
ings 48 (FIG. 3) and is formed on its outer periphery
to a cam disclosed in the prior patent and identi?ed by the
with diametrically opposed lugs 50 (FIG. 4) between
numeral 41, by which a thread lifter 163 of the patent is
which there are provided semicircular notches 52. Co
rocked to spread each loop drawn through the work
operating with the ring gear 44 motion modifying means
by the needle for entry of the shuttle beak at the ap
is provided for changing the speed of rotation of the
propriate time in each sewing cycle. As shown in FIG.
shuttle driver 22. This is accomplished by imparting a 50 1 the cam 70 is operatively connected to parts 72 and
limited angular movement to the ring gear 44- through
connections controlled by the input shaft 38.
74 corresponding to parts referred to in the prior patent as
231 and 229, respectively.
The motion modifying means comprises a pair of arms
In operation the output or shuttle driver shaft performs
54, 54 which are suspended on pivots 56 mounted at op-'
three complete revolutions for each rotation of the in
posite ends of an oscillating lever 58. The lever 58 is 55 put shaft 38 in a single sewing cycle of the machine.
secured midway between its ends to a rockshaft 60. The
Therefore, the shuttle rotates three times for every single
arms ‘54 act as releasable connections engaging opposite
rotation of the main sewing shaft 26. The shuttle while
sides of the ring member in the epicyclic gear and each
it is rotated three times in each sewing cycle is effective
arm has a projection 62 engaging a notch 52 in the ring
to enter a loop of needle thread only during every third
gear. The arms are normally biased toward each other 60 rotation and, since the motion modifying means including
by means of a pair of interconnecting springs 64 (see
also FIG. 3). When excessive force is applied to the
the epicyclic gear is active only during one rotation in
three, there is less wear and opportunity for the parts ‘to
ring gear 44, as would occur when the shuttle becomes
vary as a result of lost motion in the mechanism than with
jammed in its supporting raceway, indicated at 65 in
the drag link connection which acts during each shuttle
FIG. 2, the projections 62 will be forced out of the 65 rotation in the patented machine.
notches 52 and the ring gear 44 will be permitted to ro
In the diagram of FIG. 5 the line A—-A represents the
tate until any obstruction between the shuttle and its
curve indicating the movements of the thread lifter that is
supporting raceway is removed.
driven by the cam 70 during each complete cycle of ma
It is readily apparent that the means for actuating the
chine operation, while the line B—-B represents ‘the motion
shuttle comprises the planet carrier 46 secured to the 70 imparted to the shuttle driver shaft 24, the line C-C
forward end of the input shaft 38 rotatably connected by
indicating by reference the modi?cation from a constant
gears with a one-to~one ratio to the main sewing shaft and
speed in the shuttle driver.
the sun 40 to which the shuttle driver 22 is secured rotat
From the line A—-A it will be seen that in each sewing
ing three times for each rotation of the input shaft. The
cycle of the machine while the thread lifter cam performs
connections thus established cause the ring gear and the 75 a complete operation it reaches its maximum position at
3,062,162
5
about 240° in the machine cycle. During this cycle the
driver shaft 24 and the shuttle itself rotate three times
in succession, each rotation of which is indicated by sep
arate periods at (a), (b), or (c). In the two periods (a)
and (b) the shuttle rotates without engaging the thread,
but in the period (c) the beak of the shuttle enters and
6
opening up each loop of needle thread and for presenting
it to the shuttle, means for driving the shuttle comprising
a driver, an epicyclic gear having sun, planet carrier and
ring members, an input shaft for the epicyclic gear
connected for rotation with and at the same speed as
the main sewing shaft and connected with one of the
members of the epicyclic gear and a shuttle driver shaft
carries the needle thread loop over itself at about the 240°
connected
to another member of the epicyclic gear, in
position where the thread lifter movement has reached a
combination with motion modifying means connected
maximum. The eccentric 68 is so oriented on the input
with the third member of the epicyclic gear to speed up
shaft that it imparts an oscillation ‘to the ring gear 44 10
the shuttle driver as each loop of needle thread is en
with both a maximum and minimum speed of movement
gaged by the shuttle and to retard the speed of the shuttle
above and ‘below the unmodi?ed speed of the shuttle
driver as each loop of needle thread is being drawn from
shown by the line C-C. At the point 240° in the ma
the shuttle.
chine cycle when the lthread lifter movement has reached
A lock stitch shoe sewing machine, as in claim 2,
its maximum the beak of the shuttle enters the loop of 15 in 3.which
the shuttle driver is provided with a shuttle
needle thread, the shuttle being driven at a speed slightly
engaging arm and the motion modifying means acts to
above that of the driver shaft 24. Thereafter, in the
retard the shuttle driver and to permit the shuttle to
period (c) the etfect of rotating the ring gear 44 in a
overrun the driver in time to form momentarily between
decelerated sense upon the epicyclic gear is to cause the
the shuttle engaging arm and the shuttle a gap through
shuttle driver 22 to slow down, thus tending to create 20
which the loop of needle thread carried by the shuttle
the desired gap between the driver and the heel 301 of
may pass freely.
the shuttle throat, so that the needle loop may be re
4. A lock stitch shoe sewing machine, as in claim 11,
tracted through the gap freely and without imparting any
in which the motion modifying means comprises an oscil
tension thereto, as illustrated in FIG. 2..
By means of the epicyclic gear and the mechanism, 25 lating lever connected to the ring member of the epicyclic
gear.
herein illustrated, for modifying the motion of the driver
5. A lock stitch shoe sewing machine, as in claim 4,
shaft 24 both in an accelerating and in a decelerating
in which a releasable connection is provided between the
sense, it will be appreciated that undesirable erratic move
oscillating lever and the ring member of the epicyclic
ments of the various connections is minimized and detri
mental effects of the quality of the stitching is eliminated. 30 gear.
6. A lock stitch shoe sewing machine, as in claim 5,
It will also be appreciated that a construction of motion
in which the releasable connection comprises a spring
modifying mechanism has been provided wherein the
loaded arm having a projection and notch engagement
timing of the accelerating motion and the amount of
with the ring member.
7
acceleration imparted to the shuttle driver may readily
7. A lock stitch shoe sewing machine, as in claim 5,
be adjusted in order to obtain the best practical results 35
in which the releasable connection includes two arms piv
merely by changing the angular position of the eccentric
oted to the oscillating lever and engaged with opposite
68 on the shaft 38 or by replacing one eccentric with
sides of the ring member and a tension spring connected
another of different eccentricity, these changes being pos
between the arms.
sible without affecting each other or the other character
8. A lock stitch shoe sewing machine, as in claim 1,
40
istics of the driving connections for the shuttle.
in which the gears of the epicyclic gear are constructed
The nature and scope of the invention having been
with a ratio to cause the planet carrier member to be
indicated and a particular embodiment having been de
driven one revolution for each complete cycle of op
scribed, what is claimed is:
eration of the machine and the sun member to be driven
1. A lock stitch shoe sewing machine having a main
three rotations for each complete cycle of operation in
sewing shaft, stitch forming devices actuated thereby,
the machine while the ring member is restrained from
including a hook needle, a shuttle and a loop spreader for
rotation.
opening up each loop of needle thread and for present
9. A lock stitch shoe sewing machine, as in claim 8,
ing it to the shuttle, and means for actuating the shuttle,
in
which an eccentric is driven from [the main driving
comprising a driver and an epicyclic gear having sun, 50
shaft and a strap surrounding the eccentric is connected
planet carrier, and ring members, one of the members
to the lever for oscillating it once for each three rota
of which epicyclic gear is connected to the main sewing
tions of the shuttle.
shaft and another of which is connected to the shuttle
driver, in combination with motion modifying means
References Cited in the ?le of this patent
acting periodically on the third member of ‘the epicyclic 55
UNITED STATES PATENTS
gear to speed up the shuttle driver as each loop of needle
thread is engaged by the shuttle.
2. A lock stitch shoe sewing machine having a main
sewing shaft, stitch forming devices actuated thereby,
including a hook needle, a shuttle and a loop spreader for 60
1,247,536
2,056,670
2,392,349
2,535,774
Inshaw ______________ __ Nov. 20‘,
Gouldbourn et al. ______ __ Oct. 6,
Webb _________________ __ Jan. 8,
Armelin _____________ _._ Dec. 26,
1917
1936
1946
1950
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