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Патент USA US3071099

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Jan. 1, 1963
F. F. VZEIER
'
3,071,090
STOP MOTION MECHANISM FOR SEWING MACHINES
Filed March 17, 1961
6 Sheets-Shéet 1
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WITNESS
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_INVENTOR.‘
Frederick E Zeier
BY
A
TTORNE Y
Jan. 1, 1963
F. F. ZEIER
3,071,090
STOP MOTION MECHANISM FOR SEWING MACHINES
Filed March 17, 1961
6 Sheets-Sheet 2
_____....____...._.‘
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WITNESS
Fig.2
IN VENT0R,
Frederick E Zeier
BY
‘a? @w
AT ORNEY
Jan. 1, 1963
F. F. ZElER
3,071,090
STOP MOTION MECHANISM FOR SEWING MACHINES
Filed March 17, 1961
6 Sheets-Sheet 3
$4
INVEN TOR.
Frederick E Zeier
\
WITNESS
,
BY
% a; ,4 , [Luv
ATTORNEY
Jan. 1, 1963
F. F. ZEXER
3,071 ,090
STOP MOTION MECHANISM FOR SEWING MACHINES
Filed March 1'7, 1961
6 Sheets-Sheet 4
:2" 33
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III
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Fig.6
INVENTOR.
Frederick F. Zeier
BY
WITNESS
aw
T TOBNE Y
Jan. 1, 1963
F. F. ZEIER
3,071,090
STOP MOTION MECHANISM FOR SEWING MACHINES
Filed March 17, 1961
6 Sheets-Sheet 5
I30
IN VEN TOR‘.
Frederick E Zeier
WITNESS
c7
'°9
W‘AX 6%“
TTURNEY
Jan. 1, 1963
F. F. ZEIER
3,071,090
STOP MOTION MECHANISM FOR SEWING MACHINES
Filed March 17‘, 1961
6 Sheets-Sheet 6
IN VEN TOR.
Frederick E Zeier
WITNESS
TORNEY
United States Patent O??ce
1
3,071,090
STOP MOTION MEQHANESM FGR
SEWEN'G MACHINES
Frederick F. Zeier, Morristnwn, N.J., assignor to The
Singer Manufacturing @cmpany, Elizabeth, N.J., a cor
poration of New Jersey
Filed Mar. 17, 1961, §er. No. 96,578
4 Claims. (Cl. 112-219)
ijatented Jan. 1, 1963
2
trating the planetary gearing drive for the sewing ma
chine as well as the brake and predetermined position
ing mechanism,
FIG. 8 is a reduced cross sectional view taken sub
stantially along line 8-8 of FIG. 7,
FIG. 9 is a cross sectional view taken substantialiy
along line 9-9 or FIG. 7 and illustrating the planetary
gearing, and
FIG. 10 represents a perspective view of a portion
The invention relates to cyclically operated sewing 10 of the stop motion mechanism of FIG. 6 with portions
machines, and more particularly, to a stop motion mecha
of certain of the parts ‘broken away to illustrate the rela
nism for driving and stopping a cyclically operated sew
tionship of parts of the planetary gearing system.
ing machine in a predetermined position of the parts
Referring particularly to FIGS. 1, 2 and 3 of the draw
thereof.
ings 11 denotes the bed of a sewing machine casing
In the operation of a cyclic sewing machine such as 15 from which extends a bracket arm 12 overhanging the
a buttonhole sewing machine, a button sewer, a tacking
machine, or the like, one of the most serious problems
involves stopping of the machine after a predetermined
number of stitches have geen formed. Stitch forming
instrumentalities, thread handling mechanisms, and work
feeding devices have been developed in the art to the
point where they are no longer per se the limiting fac
bed. The sewing machine illustrated in the drawings is
of a type adapted to sew a straight buttonhole, however,
the stop motion mechanism of this invention is adapted
for use with practically any type of cyclic sewing ma
chine. Since the particular sewing machine disclosed
in the drawings forms no direct part of this invention,
only portions of the sewing machine mechanism are
disclosed and described herein, it being understood that
any other known cyclic sewing mechanism of this type
tors in the speed of operation of cyclic sewing machines.
The factor in cyclic sewing machines which limits the
speed of operation and thus the overall e?iciency of the 25 may be used.
machine is the means usually referred to as a stop mo
The drive for the sewing mechanism in the sewing
tion mechanism which in stopping the machine serves
machine is derived from a main shaft 13 (see FIG. 3)
to dissipate the kinetic energy of all the moving parts
journaled in the bed 11. By the use of mechanism (not
therein.
shown) the main shaft serves to impart translatory mo
The manner in which the stop motion mechanism ab
tion to a work clamp of which the hinged upper jaw
sorbs this kinetic energy re?ects not only on the longevity,
is indicated at 14 in FIG. 1. The main shaft serves to
dependability, quietness, and smoothness of operation
impart oscillatory motion to a needle ‘bar driving rock
of the stop motion mechinism itself but also of each train
shaft 15 carrying a rock arm ‘16 having operative con
of mechanism in the sewing machine which branches
nections for imparting endwise work penetrating move
from the stop motion mechanism.
ment to a needle bar 1‘7 which carries a pair of needles
It is an object of this invention to provide a novel
18. The main shaft 13 also drives mechanism (not
and improved stop motion mechanism in which at the
shown) for jogging the needle bar laterally in varying
end of each cycle of sewing machine operation, the sew
amplitudes including a particularly wide amplitude at
ing machine is gradually brought to a predetermined
each end of the work clamp travel to provide for barring
stopped position such that the forces stemming from
stitches at each end of the buttonhole.
the kinetic energy of the moving parts of the sewing
A shaft 19 carried in the bed is preferably associated
machine are minimized and higher sewing speed during
with the mechanism for jogging the needle bar in the
the cycle may be accommodated.
barring stitches at each end of the but-tonhole such that
‘It is also an object of this invention to provide a novel
the shaft 19 partakes of one half revolution during the
planetary gearing system in a stop motion mechanism
barring operation at each end of the buttonhole. The
with means for rearranging the planetary gearing at the
shaft 19 provides a control connection between the sew
end of each sewing cycle to provide for a reduction in
ing mechanism and the stop motion mechanism.
the speed of operation of the sewing machine prior to
Also included as a part of the sewing machine mecl1~
movement into a predetermined stopped position.
anism is a knife 20 operatively connected to a rock shaft
With the above and additional objects and advantages 50 21 in the bracket arm. By mechanism (not shown)
in view as will hereinafter appear, this invention com
which has counterpart in the prior art, the knife actuating
prises the devices, cornlbinations and arrangements of
rock shaft 21 is operatively connected to mechanism
parts hereinafter described and illustrated in the accom
driven by the main shaft as, for instance, the needle bar
panying drawings of a prefered embodiment in which:
driving rock shaft 15 during the last needle ‘oar stroke
FIG. 1 represents a side elevational view of a sewing 55 of each sewing cycle. Carried at the rear end of the
machine having the stop motion mechanism of this in
knife actuating rock shaft is a collar 22 formed with a
vention applied thereto,
FIG. 2 represents an enlarged rear elevational view
of the sewing machine of FIG. 1 with portions of the
radial lug 23 which also serves as a control connection
between the mechanism of the sewing machine and the
stop motion mechanism.
machine frame ‘broken away,
60
Fulcrumed at 39 in the bracket arm is a sewing ma
‘FIG. 3 is an enlarged horizontal cross sectional view
chine starting lever 31 to which is secured one end of a
of a portion of the sewing machine taken substantially
link chain 32 which meshes with a sprocket 33 fast on
along line 3—3 of FIG. 2,
a shaft 34 journaled in the bracket arm. The other end
FIG. 4 is a cross sectional view of the brake actuating
of the link chain is connected to a return spring 35 an
mechanism taken substantially along line 4-4 of FIG. 3, 65 chored in the machine bed. The shaft 34 carries a cam
FIG. 5 is an enlarged vertical cross sectional view
36 tracked by a roller follower 37 carried by a lever 38
taken substantially along line 5-5 of FIG. 1, and illus
in the bracket arm. The lever 38 serves, as it is urged
trating the connections for starting the sewing machine,
by the cam 36, ?rst to lower the upper jaw '14 of the
FIG. 6 is a cross sectional view taken substantially
work clamp and then to separate the driving connection
along line 6-——6 of FIG. 5,
\FIG. 7' is an enlarged vertical cross‘ sectional view
taken substantially along line ’7—7 of FIG. 2 and illus
70 between the needle bar driving rock shaft 15 and the knife
driving rock shaft 14-. Any of a plurality of latch means
may be'employed. to constrain the lever 38‘ in cam in
3,071,090
4
3
?uenced position and to release the lever 38 in stages at
the completion of each sewing cycle. One such latch is
illustrated by the latch lever 39 in FIG. 3 which is biased
by a spring 40 to underlie and constrain the lever 33
in cam in?uenced position and is associated with trip
ping mechanism (not shown) in?uenced by the sewing
mechanism to release the lever 33 sufficiently to estab
lish a driving connection between the needle and knife
driving rock shafts on the last needle bar stroke of each
ing gear 80. Three coil springs ‘81 seated in retainer cups
32 set into the ?ange 55 bear against the locking gear
at equal angular spaces about the gear and serve to bias
the locking gear 80 into mesh with the internal gear 65.
The locking gear is also provided with a plurality of lugs
83 disposed parallel to the main shaft 13 and extending
over the periphery of the flange 55 between the radial
ears 69 thereon. Each of the lugs 83 is apertured as at
64 and accommodates an arm 85 of one of a plurality of
cycle of sewing machine operation. The starting lever 31 10 hell crank levers 66 one for each of the lugs 83. The bell
also formed with a camming blade 41 which serves to
shift the stop motion mechanism into running position as
will be described hereinbelow.
The stop motion mechanism of this invention includes
crank levers 86 are fulcrurned on pins 87 in the flange 55
and are each formed with an actuating arm 88 disposed
abutting a ring 89 axially slidable on the sleeve member
51.
As best illustrated in FIG. 2 a U-shaped bracket 100 is
a means for rendering effective and ineffective a driving 15
?xed to the machine bed by means of fastening screws
connection between a belt from an electric motor or the
1% and a spacing block 102 formed with spaced up
like (not shown) and the main drive shaft 13, coupled
standing arms 103 and 104 disposed one at each side
with a means for locking the main shaft in a predeter
mined position of rotation. The arrangement which will
of the axis of the main drive shaft 13. A fulcrum pin
be described in detail hereinbelow is such that upon de 20 165 (FIG. 8) is set into the bracket arm 103 and is em
pression of the starting lever 31 the driving connection
braced on opposite sides by the semi-circular journals 106‘
between a drive belt and the ‘main drive shaft will be es
of a pair of identical brake shoes 107 which are con
strained on the fulcrum pin 165 by springs 108 biasing
rendered ineffective and the parts of the stop motion
the brake shoes together. Secured as by rivets 109 to
mechanism constrained in this running position by the 25 the brake shoes are arcuate segmental brake linings 110
radial lug 23 on the knife driving rock shaft 21 until
disposed within the drum 66. Iournaled in the bracket
actuation of the knife at the completion of the sewing
arm 104 is a shaft 111 carrying at one side of the bracket
machine cycle. This stop motion mechanism also in
arm a lever arm 112 and formed at the opposite side of
cludes a means controlled by the shaft 19 which is oper
the bracket arm with a blade 113i shaped reetangularly
ated during the barring operations in each cycle of sew 30 in cross section and, as illustrated in FIG. 7, ‘disposed be
ing machine operation for reducing the speed of oper
tween the brake shoes 107 such that upon turning of the
ation of the main drive shaft 13 prior to the Positive
lever arm 112 the blade 113 will cam the brake shoes
stopping of the main drive shaft by the locking means.
apart in opposition to the springs 108 and urge the lin
With particular reference of FIG. 7, the sewing machine
ings into frictional braking engagement with ‘the interior
tablished and the locking means for the shaft will be
main shaft 13 is formed with an end portion 50 or re
duced diameter on which is ?tted a sleeve member 51 se
cured for rotation with the main shaft by a pair of keys
52.
The free extremity of the sleeve member is formed
35 of the drum 66.
The operations of rendering the ‘brake effective and of
disengaging the locking gear 80 from the internal gear
65 are coordinated to occur substantially simultaneously
with a spirally inclined ramp 53 having at the outermost
by means of a brake actuating member 126 which is fast
part a notch 54 by which the main shaft is locked in pre 40 on a rock shaft 121 journaled in an extension 12' of the
determined stopped position.‘
Extending radilly from the sleeve member 51 is a
?ange 55 in which is ?xed at equal angular spaces three
bracket arm 12. The brake actuating member 120 is
formed with bifurcated extremities 122 and 123 strad
dling the axis of the main shaft 13 as illustrated in FIG. 2
shouldered studs 56. Journaled on a bushing 57 on each
each extremity being formed with a lobe 124- disposed to
abut the ‘slidable ring 819 by which the bell crank levers
gears 53 are arranged each in mesh with a sun gear 59 45 86 are operated to disengage the locking gear 80 from
secured for rotation with a hub portion 60 extending to
the internal gear ‘65. The bifurcated extremity 122 is
of the shouldered studs is a planet gear 58. The planet
one side of a disk 61 formed with a V belt pulley half 62.
The opposite side of the disk 61 is formed with an ex
also formed with an extension 125 in which is threaded a
screw 126 formed with a conical tip 127 adapted to con
tended cylindrical hub portion 63 the hub portions 60,
tact and cam the brake actuating lever arm 112 to ren
50
63 being journaled on a bushing 64 on the sleeve member
der the brake effective. A lock nut 128 on the screw
51.
.
126 provides for adjustment of the screw 126 to insure
The planet gears 58 are also in mesh with an internal
simultaneous effectiveness of the brake and the means
gear 65 formed on a drum 66 which is supported not only
for disengaging the locking gear.
by the gears 58 but also by a shouldered ring 67 of syn
The positive stopping of the main shaft 13 in a pre
thetic plastic bearing material, such as nylon or the like, 55 determined position of rotation is accomplished by a
which is held by screws 68 to radial cars 69 formed on
swinging frame 130 carried on a pivot pin 131 secured
the flange 55 of the sleeve member 51 and engages a
in the bracket arm extension 12'. A stud shaft 132 is
shoulder 76 formed internally of the drum 66.
journaled in the ‘swinging frame 136 in substantial axial
Rotatable and axially slidable on a bushing sleeve 71
alignment and beyond the free extremity of the main
on the cylindrical hub portion 63 is a disk 72 formed 60 shaft 13 and the hub 133 of a rock lever 134 is secured
with a V belt pulley half 73 opposite the pulley half 62.
to the stud shaft 132. A locking lug 135 which projects
Secured to the disk 72 by screws 74 is an annular clamp
from the hub 133 of the rock lever is adapted to abut
member 75 by which a thrust bearing 76 is sustained on
the spirally inclined ramp ‘53 of the sleeve member 51
the disk 72,. A flanged ring 77 ?ts against the thrust
fast on the main shaft 13v and to seat in the notch 54 in
bearing 76 and provides an annular seat against which 65 the sleeve member to lock ‘the main shaft in predeter
bears a pair of pins 73 slidable axially in diametrically
mined position of rotation.
opposite bores in a main shaft bushing member 79. A
The rock lever 134 is pivoted as at 136 to a plunger
force applied axially to the pins 78 toward the free ex
rod
137 which is guided in a swivel block 133 jour
tremity of the main shaft 13 will thus act through the
thrust bearing 76 to urge the pulley half 73 toward the 70 naled in the swinging frame 130 and provided with re
coil springs 139 and 140 constrained, respectively, between
pulley half 62 thus urging a belt entrained thereon driv
the rock lever 13d and the swivel block, and between
ingly against the pulley half 62 to drive the sun gear 59.
the swivel block and a retaining washer 141 secured at
Slidable axially of the main shaft on the shouldered
the upper free extremity of the plunger rod by lock nuts
studs 56 for movement into and out of meshing engage
ment with the internal gear 65 on the drum 66 is a lock 75 142.
3,071,090
5
Referring to FIGS. 1, 2 and 5, the swinging frame 130
is shift-ed to carry the locking lug 135 out of the notch
34 to release the main shaft when the machine is started
by means of a link 150 pivoted to a boss 151 formed on
the swinging frame 130 and to one arm 152 of a bell
t5
1% threaded in the swinging frame 130. Freely jour
naled on the pivot pin 185 adjacent to the slabbed block
186 is the hub 197 of a lever arm 198 which underlies a
rock arm 199 fast on the rock shaft 121.
The lever arm V1% is disposed above an end wall 26%
crank lever clamped to a rock shaft 153 journaled in
of the machine bed 11 which limits the downward move~
the machine bed 11. The other arm 154 of the bell
ment of the lever arm under the in?uence of gravity
crank is ?attened and disposed in the path of the cam
such that a latch notch 201 formed in the hub 197 of the
Ining blade 41 on the starting lever 31. A coil spring
latch lever is maintained in the path of motion of the
155 operatively conneced to the link 150 and to the ma 10 latch ?nger 189 on the latch lever 18% in response to
chine bed biases the swinging frame 130 toward the posi
movement of the follower lever arm 18!; under the in
tion of engagement of the locking lug 135 with the notch
?uence of the cam 18-51 on the shaft 19. During the ?rst
54.
barring operation on a buttonhole the earn 180 in moving
The swinging frame 13% is maintained in running posi
a half revolution will turn the latch ?nger 189 ‘into a posi
tion with the locking lug 135 out of the notch 54 by 15 tion overlying the latch notch 2611 and under the influ
means of an upstanding latch lug 156 ‘formed on the
ence of a light compression spring 202 the latch ?nger
swinging frame 130 which is illustrated in FIG. 1 under
will be seated in the notch. During the second barring
rides a notched ?nger 157 formed on a latch lever 158
operation at the conclusion of a cycle of sewing machine
fulcrumed on the bracket arm 12 and lightly biased
operation, the cam 1811 in moving the second half revolu
downwardly by a spring 159. As illustrated in FIGS. 1 20 tion will bring the radial portion 181 of the cam 180‘ past
and 2, the latch lever 153‘ is formed with a lip 160 which
the cam follower pin 186 and the spring 182 will become
overlies the radial lug 23 carried by the collar 22 on the
effective to turn the follower lever arm 184, and the lever
knife driving rock shaft 21. Actuation of the knife
arm 198 which is latched thereto resulting in a turning
driving rock shaft 21 will thus release the swinging
movement to the brake actuating member 12%) into effec
frame 130. An emergency stop lever 161 fulcrumed as 25 tive position. The spring 182 will continue to hold the
at 162 on the machine casing is operatively connected to
brake actuating member 121} in effective position until
a plunger 1'63 slidable vertically in a boss 164» carried
the locking lug 135 drops into the notch 5-4.1 in the sleeve
on the bracket arm 12. An abutment 165 which may be
member 51 to stop the main shaft in a predetermined
in the form of a nut threaded on the plunger underlies
position. Movement of the swinging frame 136 occa
the latch lever 158 and upon depression of the emergency 30 sioned by the locking lug 35 dropping into the notch 54,
stop lever 161 will disengage the latch ?nger 157 from
will shift the abutment screw 1% on the swinging frame
the latch lug 156 to release the swinging frame 130.
The plunger 163 also carries a projection 166 at the lower
and thereby the plunger 191 against the latch release tab
191) on the latch lever 138 to turn the latch ?nger 189
extremity which underlies an arm 167 formed on the
out of the latch notch 261 thereby releasing the brake
brake actuating member 120 such that when the emergen 35 actuating member 120.
cy stop is used the brake Will be rendered effective to
When the sewing machine is stopped between sewing
aid in stopping the sewing machine.
cycles, the parts of the stop motion mechanism occupy
The arm 152 of the bell crank lever 152, 154 which
the position illustrated in ‘FIG. 7 in which the pulley
transmits motion from the starting lever 31 to the swing
halves 62 and 73 are shifted apart rendering a driving
ing frame 130 carries a roller 170 thereon disposed in 410 belt thereon ineffective, and the locking lug 135 on the
engagement with a rock arm 171 clamped on a rock
swinging frame 134) is seated in the notch 54 holding the
shaft 172 journaled across the bed 11. A rock frame
main shaft in a predetermined angular position. The
173 formed with spaced upstanding rock arms 174 dis
locking gear 89 will be urged by the springs 81 ‘into mesh
posed one on each side of the main drive shaft is secured
ing engagement with the ring gear 65. Since the planet
to the rock shaft 172 with the rock arms 174- disposed 45 gears 58 are also in mesh with the ring gear 65, the
each in engagement with one of the pins 73 by which
planetary gear system is locked for turning movement as
the belt pulley halves are shifted toward one another.
Depression of the starting lever 31 thus simultaneously
shifts the swinging frame ran into running position and
a unit.
Upon depression of the start lever 31, the camming
blade 41 in turning the bell crank lever 153, 154“ effects
effects a driving connection of a V belt on the pulley 50 driving engagement of a drive belt with the pulley half
halves 62, 73 with the main drive shaft.
62 by way of the roller 17-0, the rock arm 171, rock arms
The brake actuating member 120 is operated to retard
174 fast therewith, pins 78, ring 77, thrust bearing 76,
the speed of operation of the main drive shaft 13 prior
and the ‘axially slidable pulley half 73. Simultaneously
to stopping by a mechanism which senses the turning of
by ‘way of the link 1511, the swinging frame 13% will be
the shaft 19 of the sewing machine during the barring
turned to withdraw the stopping lug 135 out of the notch
operations in the sewing of a buttonhole and renders
54» freeing the main shaft for rotation at the speed of rota
effective the brake actuating member 12 during the ?nal
tion of the belt pulley 62, '73. Engagement of the latch
barring operation. The shaft 19 carries a spiral shaped
lug .1156 on the swinging frame with the latch ?nger 157
cam 180 as illustrated in FIG. 2 with a radial surface 181
will maintain the stop motion parts in the running posi
joining the peripheral portions of largest and smallest 60 tion during the normal cycle of operation of the sewing
diameter. Biased against the periphery of the earn 181}
machine.
by a coil spring 182 anchored on the machine bed is a
During operation of the sewing machine while the ?rst
follower pin 183 carried by a follower lever arm 184
barring stitches are being made at one end of a button
journaled on a pivot pin 185 secured in the machine
hole, the shaft 19 will be turned one half revolution from
frame. Carried on the pivot pin and secured to the 65 the position illustrated in FIG. 2. In this movement, the
follower lever arm for turning movement therewith is a
slabbed block 186 on which is pivoted as at 187 a latch
lever 188 formed with a latch ?nger ‘18? and with a
cam 180 will shift the rock arm 184 and the latch lever
188 carried on the block 1% fast on the rock arm 184 so
latch release tab 1% disposed in the path of a plunger
notch 231 ‘in the hub of the lever arm 1%.
191 slidable in a bracket 192 fastened to the bracket arm
as to bring the latch ?nger 18% into registry with the
The drive
of the sewing machine main shaft, however, continues at
a high speed in one-to-one speed ratio with the belt
extension 12’ by the fastening screw 193'. A spring 194
arranged between the bracket 192 and an enlarged head
pulley 62, 73.
195 on the plunger biases the plunger out of engagement
Near the completion of the bu-ttonhole sewing opera
with the latch release tab 1%, however, the head 195 of
tion, the last few stitches comprise the ?nal barring opera
the plunger is disposed in the path of an abutment screw 75 tion during which the shaft 19 is turned half a revolu
3,071,090
7
tion into the position illustrated'in PIG. 2.v During this
turning movement of the shaft 19, the radial portion 181
of the cam 180 is preferably timed to traverse the fol
8
of the locking‘ gear as the main shaft is stopped or during
the slight recoil movement thereof.
The stop motion mechanism of this invention in provid
ing for a gradual speed and inertia reduction of the
lower pin 133 of the rock arm 184 while several barring
moving parts of the sewing machine correspondingly
stitches remain to be made. The rock arm 184 will thus
effects reduction in the maximum forces which must be
be released and in response to the spring 182, the lever
withstood in the stopping of a sewing machine. As a
arm 192 latched to the rock arm 184 by the latch lever
result, the top speed of sewing machine operation may be
188 will engage and shift upwardly the rock arm 199
increased appreciably and the time required for each cycle
fast on the rock shaft P1 carrying the brake actuating
member 120. Referring to FIG. 7 this movement of 10 of sewing machine operation may be reduced Without an
increase of impact loading on the sewing and stop motion
the member 1213 will effect by ‘way of the lobes 124 and
mechanisms.
axial shift of the slidable ring 89 and turning the levers
In addition the reduction of the impact loading during
86 to withdraw the locking gear 3;‘; from meshing rela~
stopping reduces the wear and maintenance not only of the
tion with the ring gear 65. Simultaneously, the move
ment of the member 120 will carry the conical tip of the 15 stop motion mechanism but also of the various trains of
sewing mechanism connected to the sewing machine main
screw 126 against the lever arm 112, causing the blade 113
fast therewith to urge the brake linings 1116 against the
shaft.
Having set forth the nature of this invention, what I
interior of the drum 66. The gears 59, 58 and 65 will,
claim herein is:
'
therefore, be free to operate as a planetary gear system.
1. A stop motion mechanism for a sewing machine
The ring gear 65 under the in?uence of the brake linings 20
having a casing, a main shaft journaled in said casing, and
fit) will serve as a stationary reaction element and the
a substantially constant speed motor for driving said main
sun gear 59 turning at the same rate of speed as the belt
shaft, said stop motion mechanism comprising, a sun gear
pulley 62, '73 will transmit motion to the sleeve member
journaled freely on said main shaft and adapted to be
51 and the main drive shaft 13 at a reduced rate by way
of the planetary gears 58. The speci?c speed reduction 25 driven by said motor, a plurality of planet gears disposed
then effected will depend upon the speci?c design of the
in mesh with said sun gear, a planet gear carrying member
planetary gear system. It has been found that a speed
secured for rotation with said main shaft, a reaction gear
reduction on the order of one third of the speed of the
disposed in mesh with said planet gear, means ‘for securing
belt pulley 62, '73 provides highly advantageous results.
said reaction gear relatively to said planet gear carrying
During the period of effectiveness of the planetary 30 member, means for positively locking said main shaft
gear system 5f, 58, 65, the speed of the main shaft 13
relatively to said casing in a de?nite position of rotation,
will be gradually reduced. The energy represented by the
operator in?uenced starting means for rendering in
inertia of the moving parts of the sewing machine will be
transmitted through the planetary gearing and the belt
effective said positive locking means and simultaneously
establishing driving relation between said motor and said
pulley 62, 73‘ to the drive belt and to the preferably con 35 sun gear to drive said main shaft at the substantially
stant speed drive means such as an electric motor associ
ated therewith.
constant speed of said sun gear, stop means controlled by
At the completion of the sewing machine cycle of
operation, therefore, the main shaft will have been slowed
rendering effective said positive locking means and for
interrupting driving relation between said motor and said
by the planetary gear system to a fraction of the normal
sun gear, and intermediate low speed drive means rendered
operating speed and a large percentage of the inertia of
the moving sewing machine parts will have been absorbed
by the sewing machine drive. The actuation of the button
hole cutting knife 24} during the last stitch in the cycle,
the operation of said sewing machine for simultaneously
effective by the operation of said sewing machine prior
to the operation of said stop means for releasing said re
action gear from said planet gear carrying member and
simultaneously applying frictional resistance to turning
serves by way of the radial arm 23 fast on the knife 45 of said reaction gear to establish a drive for said main
shaft at a fraction of the speed of said sun gear.
actuating rock shaft 21 to release the latch lever 15% which
2. A stop motion mechanism as set forth in claim 1
maintains the swinging frame 130 in running position.
including means rendered effective by the operation of said
Release of the swinging frame 130 and movement there
stop means for rendering ineffective said intermediate low
of in response to the spring 155 carries the locking lug
135 against the spiral ramp 53 of the sleeve member such 50 speed drive means and resecuring said reaction gear rela
tively to said planet gear carrying member.
that the lug 135 will drop into the notch 54 when the main
3. A stop motion mechanism for a sewing machine
shaft 13 has turned into a predetermined angular posi
having a rotary main shaft, comprising a sun gear jour
tion. By way of the link 159, this motion of the swinging
naled freely on said main shaft, means for establishing
frame 130 will release the bell crank lever 152, 154 and
with it the rock frame 173 and the rock arms 174 thereof 55 and interrupting a drive for said sun gear at a substan
which will free the pulley half 73 to shift axially and carry
the drive belt out of driving engagement with the pulley
tially constant speed, a plurality of similar planet gears
half 62.
ing member secured for rotation with said main shaft,
disposed in mesh with said sun gear, a planet gear carry
a plurality of stud shafts secured on said planet gear
When the locking lug 135 drops into the notch 54 the
kinetic energy remaining in the main drive shaft 13 and the 60 carrying member substantially parallel to the axis of ro
tation of said main shaft, means for journalling said
moving parts of the sewing machine connected therewith
planet gears one on each of said stud shafts, a reaction
will be absorbed by the coil spring 139 on the plunger 137.
gear disposed in mesh with said planet gears, a locking
Recoil will be controlled by the spring ltd-t} to overcome
gear slidable axially of said main shaft on said plurality
any overthrow in the stopping of the machine. Further
more, the movement of the locking lug 135 into the notch 65 of stud shafts, means for shifting said locking gear rela
tively to said planet gear carrying member into meshing
54 will also permit an increment of movement of the
relation with said reaction gear to establish a drive for
swinging frame 134} to carry the abutment screw 1% and
said main shaft at the substantially constant speed of
the plunger 191 influenced thereby against the tab 1% of
said sun gear, means for applying a frictional resistance
the latch lever 1%?» to release the brake actuating member
129. The brake linings lltl will thus be shifted out of 70 to turning movement of said reaction gear, and means
effective simultaneously with said frictional resistance
braking relation with the drum 66 and the locking gear 80
applying means for shifting said locking gear relatively
will be released for movement in response to the springs
to said planet gear carrying member out of meshing rela
81 into meshing relation with the ring gear 65. This
tion with said reaction gear to establish a drive for said
movement of the locking gear into mesh with the ring
gear occurs smoothly during the ?nal angular movement 75 main shaft at a fraction of the speed of said sun gear
3,071,090
means for positively locking said main shaft in a de?nite
position of rotation, manually operable means for releas
ing said positive locking mums for said main shaft and
simultaneously operating said means for establishing said
10
planet gear carrying member to bias said locking gear
into meshing relation with said reaction gear to establish
a drive for said main shaft at the substantially constant
speed of said sun gear, a plurality of locking gear shifting
drive for said sun gear, stop means operated by said sew 5 levers, fulcrum means for each of said levers supporting
ing machine for rendering said positive locking means
said levers substantially radially on said planet gear carry
for said main shaft effective and simultaneously interrupt
ing said drive for said sun gear, rendering ineffective said
means for applying frictional resistance to turning move
ment of said reaction gear, and operating said means for
shifting said locking gear relatively to said planet gear
carrying member into meshing relation with said reaction
gear, and means operated by said sewing machine prior
to operation of said stop means for operating said fric
tional resistance applying means and simultaneously op
erating said means for shifting said locking gear out of
meshing relation with said reaction gear to establish said
drive for said main shaft at a fraction of the speed of
said sun gear.
4, A stop motion mechanism for a sewing machine hav
ing a rotary main shaft, and means for positively locking
said main shaft relatively to said sewing machine in a
de?nite position of rotation comprising a sun gear jour
naled freely on said main shaft, means for establishing and
interrupting a drive for said sun gear at a substantially
constant speed, a plurality of similar planet gears disposed
in mesh with said sun gear, a planet gear carrying member
secured for rotation with said main shaft, a plurality of
stud shafts secured on said planet gear carrying member
substantially parallel to the axis of rotation of said main 30
shaft, means for journalling said planet gears one on
each of said stud shafts, a reaction gear disposed in mesh
with said planet gears, a locking gear slidable axially of
said main shaft on said plurality of stud shafts, spring
means for shifting said locking gear relatively to said
ing member, a thrust collar axially shiftable relatively to
said main shaft and arranged in operative engagement
with said plurality of levers, means operatively connecting
said levers with said locking gear to shift said locking
gear out of meshing relation with said reaction gear
upon axial movement of said thrust collar in one direc
tion, means rendered effective by the operation of said
sewing machine for applying frictional resistance to turn
ing movement of said reaction gear and simultaneously
shifting said thrust collar in said one direction to establish
a drive for said main shaft at a fraction of the speed of
said sun gear and means operated by the sewing machine
subsequent to the operation of said means for establishing
said fractional speed drive for said main shaft for sub
stantially simultaneously rendering said positive locking
means for said main shaft effective, for rendering said
interrupting means for said sun gear effective, and for
rendering said fractional speed drive means ineffective.
References Cited in the file of this patent
UNITED STATES PATENTS
1,138,309
2,659,249
2,863,411
2,870,655
2,906,222
2,966,810
Mace ________________ __ Mar. 2,
Carr ________________ __ Nov. 17,
Peets ________________ __ Dec. 9,
Rockwell _____________ __ Jan. 27,
Ketterer et al _________ __ Sept. 29,
Hayes ________________ __ Jan. 3,
1915
1953
1958
1959
1959
1961
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