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v Def. 1, 1946; _
z, 7
a. T. LEVEQUE
,523
PRESSER FOOT MECHANISM FOR SEWING MACHINES
‘Original Filed June 25 ,
1943
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5 Sheets-Sheet 1
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' I ‘Bi-r,‘ LEVEQUE "
2,408,523
PRESSER FOOT MECHANISM FOR SEWING MACHINES
Original Filled June 23, 19451"
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a. T. LEVEVQUE
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PRESSER FOOT MECHANISM FOR SEWING MACHINES
Original ,Fil'ed June 25, 1943
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Oct. 1', 1946'. f
B. T. LEVEQUE
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PRESSER FOOT MECHANISM FOR S'EWING MACHINES‘ -
2,408,523
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Original Filed June 23, 1943 ‘Y 5‘Shee’cs'4Sheet 4
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Oct. 1, 1946.,
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B, T, LEVEQUE
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2,408,523
PRESSER FOOT MECHANISM FOR SEWING MACHINES
Original Filed June 23, 1943
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2,408,523
Patented Oct. 1, 1946
UNITED STATE sv
PATENT ' OFFICE
2,408,523
PRESSER FOOT MECHANISM FOR SEWING
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MACHINES
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Bernardw'i". Leveque, Wenham, Mass., assignorto .
United Shoe Machinery Corporation, Fleming-1 ,
ton, N. J ., a corporation of New Jersey ‘ '
Original application June 23,1943, Serial No. I
, 491,863.
Divided and this application July 27,
1945, Serial No. 607,292
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3 Claims. .(Cl, 112-61) , s
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operation for the purpose of rendering the ma
The present invention relates to- improvements '
chinefmore effective thanother similar straight
in sewing machines for operating upon shoes or 1
other articles composed of still, heavy materials
and to'presser f-oot. actuating mechanisms partic
needle machines and to obtain a more uniform
ularly useful with machines of the type disclosed
in. United States Letters Patent No. 2,352,274,
granted on June 27,. 1944, in the name ‘of ‘the
present inventor, and in a copending application
Serial No. 491,863, ?led on ‘June 23,1943, of which .10
substantially the external dimensions of the
frame or other enclosing structure. Further ob:
jects 'offthe invention are to simplify and vimw
operation and durable construction in the presser
foot actuating .mechanism without-increasing
prove the effectiveness of a presser foot actuat
ing mechanismin ‘other respects and generally
the present application is a division. v
7 to provide a machine which will sew heavy Work
The. machine of the patent and copending ap
plication is provided with a reciprocating straight : is and ' possess ability. to‘ operate above tho'sel‘speed‘s
now-in, customaryuse without the exercise ‘of
_' needle and a straight awl actuated by relatively
simpleconnections from the main sewing shafts.
The work operated upon is clamped in position
in each sewing cycle between a work support and
special skill or'?maintenance'of. careful adjust
m'e'ntin'the machine by the operator.
-
In the design of a straight needle type of sew- »
ing machine, an important problem is in obtain 20
ing within the con?nes of a relatively small space
a construction for moving the operating parts
which may be enclosed completely or otherwise
protected from accidental contact. If the outside ‘
dimensions of the machine, particularlyin a'hor
izontal direction from onesideiof the machine
to theother, are bulky, the operator’s line of’
vision or the light atv the sewing point will be ob- ~
scured to an. objectionableextent andthe work 1
,i'
tures of the present invention according to these
arpres'ser foot actuated intermittentlyto release _
thework for the feeding movement. ;
I
The illustrated machine embodying the‘ fea-i
_
and other objects comprises'stitch forming de-'
vices-a work support, a'jpresser foot, ,‘a sliding
‘spring-pressed, presser foot bar for, urging the
presser yieldingly against the work‘ upon the
work support to clamp'it in sewing, position to
gether with means .for actuating the presser foot
positively . in
two directions both ‘ toward and
from the,‘ work during each sewing cycle, in
cluding a lock‘ supporting block slidingly mount;
ed directly on the presser foot bar, ‘and a two
way‘ clutch in theblock for lockingthe block to
the presser footbar. By‘ this construction, the
operated upon will be limited to that "of ‘rel 30 presser foot bar when unlocked may be urged
yieldingly toward the Work to clamp the work,
atively flat nature or to straight edged types of
the sliding block remaining stationary so as not
work requiring no special attention to guide them
to add, to the weight and the’ inertia of the
through the machine. ‘ Bulky construction of, a
presser foot and presser foot bar. Thus,vthe
machine also renders it’extremely dif?cult to ‘0p
slight yielding movement required to move the
erate upon work having curved or angular out 35 presser foot and bar may be accomplished quickly
lines, as is often encountered when sewing shoes,
and without substantial impact on the work at
small instrument cases and similar articles.
the end’ of the movement andit is not necessary
. -, With ' a
straight» needle
machine, , operating
to readjust the presser foot actuating mechanism
mechanism provided with a presser foot sup
for different thicknesses of_ work. I
portingand reciprocating bar is most practical.
To obtain a tight and easily, operated ‘mecha
nism, the actuating connections for the presser
' In additionto these "features, still other 'fea
tures of the inventio'ri'are embodied in certain
constructions; ' combinations and arrangements
foot bar preferably are yieldingly, actuated and
hereinafter'de'scribed and‘ claimed, the
positively locked while the work is released as 45 of‘parts
advantages of which wil'l'be readily understood
Well as while'clamped. To enable uniform yield
ing engagement of the presser foot with the work
from the following detailed description. "
Referring to the drawings‘,
at high speeds, particularlyfwhen the thickness >
of the work varies, the lockmust unlock the con;
nections quickly and relock them with certainty.
To be effective at high sewing speeds employed
in present'day practices the'pre'sser foot lock
must be actuated accurately and positively to
enable clamping and releasing the work‘with uni
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Fig. 1 is a view in front elevation of a machine
embodying the features of the present invention;
50
Fig. 2 is a front view, on an enlarged‘ scale, of
the-‘upper portion of the machine illustrated in
Fig. l with a front cover'removed, exposing the
needle and presser foot actuating mechanisms;
Fig. 3‘ is a detail front view of the presser foot
actuating ‘mechanism in a position taken during
The objects of the present invention are to 55 sewing
operations while the presser foot is locked
form results.
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simplify and improve the operation of’ prior ma
chines of the type referred to, to provide a corn
pact construction which will enable the use of
against the work;
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Fig. '4 is a detail front view of part of the mech;
anism illustrated in Fig.‘ 3 in position after the
a. simple and effective presser. foot actuating
machine is stopped and the presser foot lifted
mechanism including a lock capable of high speed 60
2,408,523
3
4
from engagement with the work to enable the
work to be removed;
loosely supported in bearings formed in lugs pro
J‘ecting inwardly of the machine frame. When
the machine is stopped, the driving lever 26 is free
to oscillate without imparting any reciprocating
movement to the needle but, during sewing, a pin
‘
Fig. 5 is a partial sectional detail view of the
parts illustrated in Fig. 3 taken during the sew
ing operations, with the presser foot still locked
against the work but about to be raised to permit
the work to be fed a stitch length;
Fig. 6 is a similar view of the same parts, taken
3!; carried by the curved end of the lever 26 is
engaged by the lower hooked inner end of a latch
link 32 pivoted on a pin 34 secured at the end of
while the presser foot is being lowered against the
the needle actuating lever 35 loosely fulcrumed
work;
10 on the rockshaft 28.
Fig. 7 is a similar view of the same parts, illus
trating the positions with the presser foot un
locked so that it may adjust itself yieldingly to
the thickness of the work;
Fig. 8 is a detail view in left side elevation of
To maintain the latch link
in engagementwith the pin 30 during sewing, a
15
the parts illustrated in Fig. 5;
Fig. 9 is a detail View, looking from the vrear
of the presser foot lock, taken along the line
IX-IX of Fig. 8; and
spring-38 is coiled around a hub on the link and
‘acts to swing the link in a counterclockwise direc
tion. The lever 35 is in turn pivotally connected
through a short link 4!] to a block 42 secured on
a vertical reciprocating needle supporting bar M.
For shifting the ‘needle latch link 32 to con
nect or disconnect the needle, a needle controller
shaft 55 is provided, mounted in suitable bearings
at the right and above the operating shaft 8, At
the outer end of the needle controller shaft 45
isa shift lever 48, the upper end of which has a
slotted locking piece 5!} and a latch ?nger 52
clamped to its opposite sides. The latch shifting
?nger is so located that, when the actuating
‘lever
is in its highest position, counterclock
Fig. 10 is a sectional View of the ,presser foot
bar and lock, taken along the line X-X of ‘Fig. 9.
The sewing machine illustrated in the draw_
ings is a chain-stitch, eye-pointed, straight
needle machine having a straight awl operating
from below and the needlefrom above the work.
A work feeding movement is imparted to the awl
while engaging the work to advance thehwork'a
stitch length. To form a loop in the thread car
ried by the needle and hold .the loop in position
wise movement of the shift lever ‘t8 will cause the
latch shifting ?nger to engage the latch link 32
and swing the latch link clear of the pin 30, thus
during the succeeding sewing cycle for the. entry 30 discormecting the needle bar from its actuating
of the needle, the machine is equipped with an '
oscillating loop taker (not shown) acting at the
mechanism. At the same time, the slotted look
ing piece 5d engages the outer end of the pin 34
same side of the work with the awl, all of the
stitch forming devices being driven from parallel
to hold stationary the needle actuating lever 36
operating shafts through cams, cranks, pitmans
and the needle bar connected thereto in their
35
highest positions, thus stopping sewing opera
and other suitable connections, as in the machine
tions. To hold the needle controller shaft 45 and
shift lever 48 in either starting or stopping posi
tion, the rearward end of the shaft is connected
with mechanism under control of a vertical trea
are entirely enclosed by an‘ oil-retaining .hollow 40 dle rod '55:, described more fully in the copending
supporting frame or casing ,2 having at its upper
application to which reference may be had for a
portion an overhanging arm and at its lower .por
more complete disclosure.
tion a base, within which arm and base are ar
The train of the awl actuating mechanism is
ranged‘distributing means including an oil pres
generally similar to that for the .needle. ,
sure pump and spray and drip delivery jets (not "‘
The work is secured in sewing position against
shown).
the thrust of the awl operating from beneath the
In the illustrated machine, the needle is shown
work in a well-known manner. The work rests
at 4, the awl at 6, and the operating shafts com
upon a stationary work support, indicated at 56,
prising main sewing and auxiliary shafts at 8
and is clamped by a presser foot 58 acting on
and H1 in the frame and base positions. The
the upper surface of the work. The work sup
operating vshafts are driven in unison through
port is in the form of a plate secured to the lower
suitable driving connections,
base portion, of the enclosing casing 2 and the
Trains of connections for the needle and awl
presser .foot is secured to a reciprocating barfifi
actuating mechanisms, in the illustrated machine
slidingly mounted in suitable bearings in the
of inventor’s patent and copending application
above identi?ed. To facilitate lubricating the
machine, the operating and driving mechanisms
as in the machine of the patent and application, I 5 overhanging arm portion of the casing.
To
bring the presser foot yieldingly against the work
during each sewing cycle, the upper end of the
presser foot bar is surrounded by a spring 52
include elements movable to disconnect both the
needle and awl separately and to bring them
to rest at the ‘opposite ends of their respective
reciprocating strokes. The disconnectible ele
ments of the connections comprise parts of a
driving and stopping mechanism, to be more fully
described hereinafter. ,
Referring more particularly
the train of needle actuating
prises a co-untershaft {l2 witha
driven from the main shaft '8,
engaged at its ends with a shoulder on the bar
and a sleeve 64 vthreaded in the machine frame.
To actuate the presser foot'toward and from
the work and to lock the presser foot in engage
ment with the work so that the work may be
fed freely and thereafter be secured against move
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to Figs. 2 and 3.
mechanism com
crank l4 thereon,
and a pitman l6,
one end of which surrounds the crank and the
other end of which is pivotally connected to one
arm of -,a three-armed lever l8 fulcrumed on a
shaft 2e secured between spaced supports on a
bracket 22 mounted within the upper portion of
the machine frame. Another arm of the three
armed lever 18 is connected through .a link 24
(see Fig. 6) toacurved driving lever 26 fulcrumed
on acentral portion of a horizontal rockshaft 28
(5.“;
ment during formation of each stitch, the third
arm of the three-armed lever I 8 carries a cam
roll 66 (see Figs. 2, 3, 5, '7 and 8) engaging a
suitably formed cam slot 68 in an arm 1B clamped
to the rearward end of the rockshaft 23.v The
forward end of the rockshaft has clamped to it
a slotted arm 72 in the slot of which is adjust
ably secured a bolt 74 forming the pivotal con
nection for the upper end of a link 15, the lower
end of which is pivoted to a presser foot lock
supporting block 18 slidingly mounted on the
2,408,523
presser foot reciprocating bar. 60. When the
presser foot bar is locked to the block 18, move
ment of: the three-armed lever It! causes: the
presser'foot to be lifted from or lowered against
the work through direct-acting, non-yielding
mechanism, the shape of the cam slot 68 being
such that positive movements in two directions
occur during dwells while the needle and awl
are‘ at the upper end of their reciprocating
end of the trip ?nger at the end of the‘ descent ,
of the lock supporting block, the eccentric disk
portion on the pivot 92 presses the wedge slide
90 toward the presser foot bar and separates the
rolls 80 .(Fig. 7) to unlock the presser foot bar
and to enable the presser foot to engage the work
yieldingly.
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The trip ?nger 86 is pivotally supported by a
screw 98 in a lug on the needle driving lever v26.
releasing the lock, the trip ?nger is moved
strokes. During the remainder of each sewing 10 After
away
from the trigger by the engagement of a
cycle, the presser foot actuating mechanism re
stop on the trip ?nger with a projection I00 on
mains stationary with the presser foot locked in
the lever 25. To holdv the trip ?nger in a posi
engagement with the work.
tion where it will engage the trigger, the screw
The means for locking the presser foot to the
98 is surrounded by a coiled spring I02 acting at
locksupporting block is of a novel and improved 15 one
end on the needle driving lever-and-at the
construction particularly e?ective for high-speed
vother end on the trip ?nger, the trigger being
actuation, ‘the operating time requiring but a rel
beveled at its outer end to-force the trip ?nger
atively small fractional part of each sewing cycle.
out of the. path of the trigger (Fig. 5) during up
In certain respects, the mechanism for actuating
ward movement of the lock supporting block and
20
the presser foot in the presentapplication is sim
presser foot. The presser foot actuating and
ilar to that of United States Letters Patent No.
2,321,032, granted on June 8, 1943, in the name
of the present inventor, in which ‘there is dis
closed an oscillating two-way clutch for looking
locking mechanism is so adjusted that the
presser foot bar is released from the look only
after the presser foot has been lowered sub
stantially into engagement with‘ the work; In
a reciprocating presser foot bar. In order to 25 this way, little'or no. movement of the presser
connect the presser foot bar of said Patent No.
foot bar from the force of the presser 'foot
2,321,032 with the oscillating clutch, link connec
spring‘ 62 occurs after the presser foot en
tions are required which add inertia to the parts
gages the work. As a result, the presser foot
and in turn tend to increase the forces required
may be operated at relatively high speeds with
to move the parts with rapidly accelerated mo 30 minimum reliance upon the force of the spring
tion. Accordingly, a longer time is required to
62 to bring the presser foot accurately against
raise and lower the presser foot during each sew
the work.
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ing cycle than where the connections are of light
For lifting the presser foot from? engagement,
er weight; In the present improved presser foot
with the work after a seam has been completed
35
mechanism, thev two-way clutch for locking and
in order that the work may be withdrawn from '
unlocking the‘presser foot acts directly on‘ the
the machine, the presser foot is ?rst unlocked,
presser foot bar without the use of any separate
and a roll I04 projecting forwardly from the
presser foot bar is engaged by a lever I06 piv
a lighter'spring 62 may be employed to urge the
otally mounted on a ?xed screw I08 (see Figs.'3
presser foot against the work with the certainty 40 and 4). The left end of the lever has clamped
of reliable work clamping action. With the use
to it a block H0 supporting. a lock releasing
of a lighter spring, there is less danger of mark
roll H2 acting when raised against a cam sur
ing or injuring the work from impact during en
face on an arm ' I 14 secured to the forward end
gagement by the presser foot.
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,\ of the eccentric pivot 92 ofthe presser foot lock
Referring to Figs. 5 to 10, inclusive, the presser
to release the presser foot'bar from the lock. One
foot locking clutch is of the two-way roll type
arm of the lever M6 is connected to a toggle
yieldingly actuated toward locking position and
comprising a'link H6 ‘and an arm 1 it! fast to the
positively actuated toward releasing position.
forward end of the needle’ controller shaft 46.
The rolls of the clutch are indicated at 80 in
With the controller shaft in starting position, the
connections between the lock and the bar. . Thus,
Figs. 5, 6 and 'l loosely mounted in an opening
within the lock supporting block ‘I8. The rolls
Bil-are backed by springs 82 compressed'between
the'rolls and retaining plates 84 removably se
cured to the supporting block 18.
The rolls 8!!
are moved toward locking positions by the
springs 82 which force the rolls along oppositely
inclined surfaces toward each other in the sup
porting block to wedge the rolls against a hard
toggle'is broken with the central joint out of
alinement with the end'pivots (Fig. 3) and the
roll~l l2 ‘and its‘ actuating lever are held in lowered
position out ‘of engagement with the lock releas;
ing- arm H4 and thepresser foot lifting‘roll I04.
When the needle controller shaft 46 is ‘rocked
to stopping position, the'partsassume the rela-v
tions illustrated in Fig. 4.
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To prevent the presser foot locking rolls from
, ened ?at wear plate 86 embedded in a side sur
being
accidentally disengaged from the plate 86
face of the presser loot bar 60. To release the (EU on the presser foot bar, a downwardly extending
presser foot bar, the rolls are ‘forced apart by a
lug ‘on the releasing arm il-l. is connected to one
wedge 88 ?xed to the inner end of a slotted slide
end of a tension spring I29, the other end of
90 movable horizontally in a guideway within the
lock supporting block 18.
‘To actuate the lock releasing wedge 88, a pivot
92 having a central eccentric disk portion passes
through the slot in the slide 90 and has its ends
mounted in bearings in the sides of the support
ing block‘ outside of the slide 90 (see Fig. 10).
Clamped-to the rearward end of the pivot 92 is a
trigger 94 projecting into the path of a trip
?nger 96 the hooked portion of which is shaped
to retain the trigger 914 while the lock supporting
block 18 is descending toward the work (see Fig.
6) .‘ When the trigger is engaged by the hooked 75
which‘is madefast-to a lug on the lower end of
the link 15, a stop lug 122 being provided on the
lock releasing arm H4 (see Fig. 8) to engage the
supporting block 18 and limit the movement of
the lock releasing arm H4 under the action of
the‘ spring 120. The spring 120 thus holds the
releasing arm in'inoperative position'except when
positively actuated.
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~ The nature and scope of the invention having
been indicated and a particular embodiment hav
ing'been described. what is claimedis:
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: l’. A sewing machine having, in combination,
2,408,523
stitch forming devices, a Work support, a presser
foot, asliding spring-pressed presser foot bar for
urging the presser foot yieldingly .against the
block to the presser foot lb'ar‘to hold the work
against the thrust of the fawl ‘and to lift the
presser .fo'ot from the work during work ‘feed,
means .for unlocking ‘the ‘bar "from the clutch ‘in
work-on .the work support, and means ‘for actuat
ing the presser ,foot positively toward and from CH each sewing cycle, a trigger on the lock support
the work during each sewing cycle, comprising a
ing block to unlock the block ‘from the bar, and
lock supporting block slidingly mounted on the
a trip ?nger operated by the needle actuating
presser foot bar, mechanism acting in two direc
mechanism ‘acting to engage the trigger at the
tions to move the block, and a two-Way clutch
end of the movement of the supporting block and
for :locking the block to the presser foot bar.
10 to disengage the trigger while the presser foot
2. A sewing machine having, in combination,
engages 'the'work.
stitchiforming devices, a work support, ‘a presser
'6. A‘sewing machine having, in combination,
foot, a sliding spring-pressed presser foot bar for
an eye-pointed needle atfone side of'the work, an
urging ‘the presser foot yieldingly against the
awl at the other side of the work, a work support
work-on the work support, and means for actuat~ 15 at the side of ‘the 'work with ‘the awl, a jpre'sser
ing the presser ‘foot vpositively toward and ‘from
foot at the side of the work with the needle,
the work during each sewing cycle, comprising a
mechanisms for actuating the needle and awl,
lock supporting block slidingly mounted on the
a sliding spring-pressed presser foot bar, and
presser foot bar, mechanism acting in two direc
means ‘for ‘actuating the presser foot toward and
tions to move the block, a two-way clutch for 20 from the work during each sewing cycle, compris
locking the block .to the presser foot bar, and a
ing a ‘lock supporting 'lolock slidingly mounted on
trigger on the lock supporting block actuated at
the presser foot "bar, connections ‘between the
the “end "of the movement of the supporting block
needle actuating ‘mechanism and the lock sup
towards the work 'to unlock the block from the
porting block for moving the ‘block positively in
presser foot bar.
two'directions, a two-way clutch for locking ‘the
3. (A sewing machine having, in combination,
‘crock "to the presser ‘foot bar to hold the work
stitch forming devices, a work support, a presser
against the thrust of the .awl and to lift the
foot, a sliding spring-pressed presser foot bar for
presser foot from the work during ‘work feed, a
urging the presser foot yieldingly against the
trigger on the locksupportin‘g'block to unlock
work on the work support, and means for actuat
the hlock'from the bar, 'a trip ?nger pivotally
ing the presser foot positively toward and from
mounted on a part ‘of the'needle actuating mech
the work during each sewing cycle, comprising a
anism, yielding means ‘for urging the trip ?nger
lock supporting block slidingly mounted on the
toward the path of the trigger while the lock
presser foot bar, mechanism acting in two direc
supporting block is-be'ing moved, ‘and a projection
tions to move the block, a two-way clutch for
on said part'of the needle ‘'actuating mechanism
locking the block to the presser foot bar, a trigger
for moving the. trip v?nger away from the trigger.
on the lock supporting block actuated at the
7. A. sewing machine having, in "combination,
end of the movement of the supporting block
stitch forming 'd'evices,a work support, a ‘presser
towards the work to unlock the block from the
foot, a sliding spring-pressed presser foot bar ‘for
presser foot bar, and yielding means for actuat 40 urging the ‘presser foot yiel'dingly against the
ing the trigger in the opposite direction to cause
work on the ‘work support to clamp the work in
the block to be relocked to the bar.
sewing position, and means for actuating the
4. A sewing machine having, in combination,
presser foot “positively toward and from'the work
an eye-pointed needle at one side of the work,
during each sewing cycle, comprising a lock'sup
an awl at the other side of the work, a work sup
porting block ‘slidingly mounted ‘on the presser
port at ‘the side of the work with the awl, a presser
foot bar, mechanism acting in two directions to
foot at the side of the work with the needle,
move the block, a‘two-way clutch for locking the
mechanisms for actuating the needle and awl, a
block to the presser foot bar, stopping connec
sliding spring-presSed'pre-Sser foot bar, and means
tions for stopping the operation of the machine,
for actuating the presser foot toward and from
a lockreleasin'g'arm connected to the clutch, and
the work during each sewing cycle, comprising a
a ~lever in said stopping “connections for actuat
lock supporting block slidingly mounted on the
ing said lock releasing arm and lifting the "presser
presser ‘foot bar, connections ‘between the needle
foot from clamping engagement with the work.
actuating mechanism and the lock supporting
'8. A sewing machine having, in combination,
block for-moving the block positively in two direc
' stitch forming vdevices, a work support, a presser
tions, a two-way clutch for locking the block to
foot, a sliding spring-pressed presser foot bar for
the presser foot bar to hold the work againt the
urging ‘the presser foot yieldingly against the
thrust of the awl and to lift the presser foot from
work ‘on the work ‘support to vclamp 'the'work in
the ‘work during work feed, and means for un
sewing position, ‘driving control connections for
locking the bar from the clutch in each sewing
stopping the operation of the machine, and
means for actuating the presser foot positively
5. A sewing machine having, in combination,
toward and from the work during each sewing
an eye-pointed needle at one side of the Work,
cycle, comprising a lock supporting block slidingly
an awl at the other ‘side of the work," a work'sup
mounted on the presser foot bar, mechanism a'ct_
cycle.
‘
.
port at the ‘side of the work with the awl, a presser
foot at the side of the work, with the needle,
mechanisms for actuating the needle and awl,
a sliding spring-pressed presser foot bar, and
means for actuating the presser foot towards and
from the work during each sewing cycle, compris
ing a lock supporting block slidingly mounted on
the presser foot bar, connections between the
needle actuating mechanism and the lock sup
porting block for moving the block positively in
two directions, a two-way clutch for locking the
ing in two directions to move the block, 'a two
way clutch for locking the block to the presser
foot bar. a trigger ‘for releasing the clutch during
each sewing cycle, a lock releasing arm connected
to thetri'gger, and a lever connected to said driv
ing'control connections for actuating said lock
releasing arm and ‘for lifting the presser-foot
from ‘clamping engagement with the Work when
the sewingoperat-ions are stopped.
BERNARD .‘I', LEVEQU'E.
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