Improvements in Sewing Machines for Use in the Manufacture of Boots and Shoes.
Year: 1899

page_text: COMPLETE SPECIFICATION.
[Communicated from abroad by JOSEPH ELI BERTRAND, of 196, Summer Street,
Boston, Massachusetts, United States of America, Machinist.]
Improvements in Sewing Machines for Use in the Manufacture of
Boots and Shoes.
I, HENRY HARRIS LAKE of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
-
My invention relates to waxed thread sewing machines and to that particular
class of machines which are used for stitching outer soles to welts by what is
known as a lock stitch, and it consists in certain novel features of construction,
arrangement, and combination of parts, which will be readily understood by refer-
ence to the description of the accompanying drawings, in which :
Figure 1 of the drawings is a plan of the head of a sewing machine illustrating
my invention.
Figure 2 is a front elevation of the same.
Figure 3 is an elevation of the right hand side of said_head.
Figure 4 is an elevation of the opposite side.
Figure 5 is a sectional elevation, the cutting plane being on line ** on
Figures 1 and 2 and looking towards the right of said figures.
Figure 6 is a rear elevation of the shuttle race, the rack, and the pinion for
operating the shuttle carrier, removed from the frame and drawn to an enlarged
scale.
Figure 7 is a section on line yy on Figure 6.
Figures 8 and 9 are respectively a plan and an elevation of a portion of the rear
end of the arm L, its thread guiding sheave, and the sheave locking device
drawn to a still larger scale.
Figures 10 and 11 are respectively an elevation and a section of one of the
thread guiding sheaves on the stitch setting arm.
Figures 12 and 13 are respectively a rear elevation and a side elevation of the
thread finger, and its lever.
Figure 14 is an elevation of the thread measuring fork looking toward the front
of the machine.
Figure 15 is an elevation of the needle segment, the lever and cam for operat-
ing the same, the needle guide and the inner gear segments for operating the
same.
Figure 16 is a plan of the sliding bar E³ and its sheave carrying arm.
Figures 17 and 18 are two views in elevations of the needle.
Figures 19, 20, 21, 22, 23 and 24 are illustrative diagrams to be hereinafter
referred to.
Figure 25 is a rear elevation of the shuttle removed from the machine, and
Figures 26 and 27 are edge views of the same.
In the drawings A is the base plate of the frame of the machine head, having
formed in one piece therewith the two upwardly projecting plate like standards A¹
'

page_text: and A and firmly secured to a supporting column B of any suitable construction.
The base plate A has set therein the columns A3 and A provided at their upper
ends with suitable bearings in which is mounted the shaft C upon which are
mounted, between said bearings the three cam discs C, C, and C³ which are
firmly secured thereto in fixed positions so as to revolve therewith, and said shaft
has also secured thereon outside of the column A³, the driving wheel C, which
receives á suitable belt for operating the machine by power, and by which the
machine may be operated by hand when desired.
The standard A has formed integral therewith, at its upper end, the laterally
projecting branch A5 in the upper side of which is a suitable groove, parallel to
the axis of the shaft C, in which is fitted so as to be movable endwise therein,
the feed slide D, the inner end of which has formed thereon or
secured thereto the pendent arm D¹ in the lower end of which is
firmly secured a stud a upon which is mounted the segment D³
with the teeth of which the gear segment 6 formed on the front end
of the lever D³ engages to impart an oscillating motion to the segment D and
the awl a as said lever D³ is vibrated by the action of the cam path 6', formed
in the side of the cam disc 0, upon a truck or roller mounted at a³, upon a stud
set in said lever, as shown in Figure 5, all in a well known manner.
The feed slide D is confined in the groove in the standard A'A by the cap :
plates and a Fig. 1 and has an intermittent reciprocation imparted thereto, to
feed the work, by the action of the cam path c, in the periphery of the disc C³,
upon a truck carried by the rear end of the lever C5, fulcrummed at cl on the cap
plate a³, and provided with a longitudinal slot in which is adjustably mounted
a pin the lower end of which enters a block set in a slot in the plate e firmly
secured to said feed slide, at right angles thereto, said pin and block being
adjusted by means of the lever (see Figures 1 and 2) to vary the feed and
regulate the length of the stitch in a well known manner.
The pendent arm D has mounted on its front face so as to be movable endwise
thereon the plate d, to the lower end of which is secured the presser foot, and
having set in its upper end a stud upon which is mounted the block ³ which is
engaged by the forked front end of the lever E falcrummed at e, upon the inner
end of the feed slide D, and carrying at its rear end the truck el which is acted
upon by the face cam e Figure 5 formed upon the periphery of the cam disc C
to force the presser foot downward upon the work, said presser foot being raised
by the reaction of the spring all in a well known manner.
E is the work support adjustably secured to the lever E, pivoted at f Figure 3
to the standard A' and engaged at its lower end by the forked front end of the
bar E, fitted to, and movable endwise in, a guide way E4, secured to the base
plate A, said bar being pressed toward the front of the machine by the tension 4
of the spring thereby moving the front end of the work support E³, upward to
clamp the work between it and the presser-foot.
I
The top plate of the guide way E has cut through it a rectangular opening in
which is placed a steel plate Figure 16 which rests upon the bar F and is
pressed hard upon said bar, to lock it against rearward movement, by the heel or 4
point g Figure 3 of the lever F being forced downward by the tension of the
spring surrounding the upper portion of the rod 9 between the nut g and
the pin h, through which said rod passes, said rod being connected at its lower
end to the rear end of the long arm of said lever F as shown.
The front arm of the lever F projects forward and upward as shown in Figure 3 5
and is acted upon by the lifted toe h¹ formed upon the hand lever G to release
its locking grip when it is desired to insert or remove the work, said hand lever
also acting upon a truck i mounted upon a stud set in the lower end of the
lever to move said lever about its fulcrum and depress the work support
against the tension of the spring f¹.
The rear or long arm of the fever F has mounted on a stud set therein at the
truck which is acted upon, at a given time in each revolution of the shaft C, by
5

page_text: a cam surface on the periphery of the inner portion of the cam disc C³, to auto-
matically release the locking grip of said lever F.
The lever D³ which operates the awl segment is fulcrummed upon a stud j set
in the stand H firmly secured to the base plate A at the rear of the cam disc C
as shown in Figure 5.
The standard As has firmly secured therein, in axial line with the stud a upon
which the awl segment is mounted, the stud a³, Figure 4, upon which are
mounted so as to be revoluble thereon the needle segment D4, and the needle
guide .
The needle segment D has firmly clamped thereto the curved barbed needle &.
which is provided with a barb on its right hand side as viewed from the front
of the machine, and with a shallow groove Figure 18 extending from said barb
in a straight line to the point of the needle, the effect of which is, that, the two
portions of the loop of thread drawn up through the work by the needle are in a
vertical plane at right angles to the plane of movement of the point of the
shuttle, and said loop is slightly opened by the action of the grooved end portion
of the needle upon the front strand of said loop when said needle is in its upper-
most position so that the shuttle may enter, open and pass through said loop with-
out the aid of, any other loop opener.
The needle segment D is engaged by the teeth of the gear segment formed on
the front end of the lever H¹ fulcrummed at h on the stand H Figure 5, and
provided between its two ends with a stud carrying a cam truck which
engages with, and is acted upon by the path a Figure 15 formed in the side of
the cam disc C' to impart an oscillating movement to the needle segment to cause
the needle to enter and be withdrawn from the work in a well known manner.
The needle guide has formed thereon a toothed segment which is engaged
by the segment or pinion formed upon or secured to the inner end of the short
shaft m having a bearing in the standard A³ and having secured upon its outer
end the gear segment which is engaged by a gear segment formed on the front
end of the lever ma fulcrummed on the standard A2 and carrying at its rear or
upper end the truck m³ which is acted upon by a cam surface m formed upon the
periphery of the cam disc C¹ to vibrate said lever and move the needle guide, the
truck m being held in contact with said cam by the tension of the spring m³ all
in a well known manner Figure 4.
The standard A has set therein a forked headed stud. I Fig. 4 so as to be
movable about its axis, and has pivoted in said forked head the lever I¹ carrying
at its front end the looper n, and at its rear end the cam trucks n' and ³ arranged
with their axes at right angles to each other, the former of which enters and is
acted upon by the cam path n³ formed in the outer side of the cam disc C¹ and
the latter is acted upon by the side face cam n Figure 1 formed upon the outer
side of said cam disc C, said truck n being held in contact with said face cam
by the tension of the spring o acting upon the plunger of set in a bearing in the
column A as shown in Figure 2, mostly in dotted lines.
J is a bracket bolted to the under side of the flange of the column B and pro-
jecting to the rear therefrom to serve as a support for the wax-pot, which with
the rear portion of said bracket is not shown.
A smaller bracket J Figures 3, 4 and 5 is bolted to the bracket J and has
mounted therein the spindle of upon which is mounted the tension wheel J³, the
pressure disco, the spring of and the spring compressing or adjusting nut o³
Figure 1 all of well known construction.
K is a lever fulcrummed upon the same stud which forms the fulcrum of the
lever D³, but upon the opposite side of the stand H, from said lever D³, and has
a vibratory motion imparted thereto by the action of the face cam
formed on the
hub of the cam dise C, upon a truck carried by the forward end of said lever and
the tension of the spring q, said spring and cam being shown in dotted lines in
Figure 5.
The rear end of said lever K. has secured thereto the plate 2ª which when

page_text: depressed serves as a brake shoe, to press upon the thread 2 within the groove of
the tension wheel, to prevent thread being drawn therefrom when the shuttle is
passing through the loop, and when the stitch is being set.
The lever which operates the awl segment has a short arm projecting to the
rear from its pivotal connection to the stand H in the rear end of which is adjust-
ably secured by a set screw or other suitable means the pendent rod r having its
lower end forked or provided with a V shaped notch Figure 14 to engage the
thread 2 between the tension wheel J and the thread guiding sheaver and press
said thread downward from a straight line into a V shape and thus draw off from
the tension wheel, and from the waxpot the required amount of thread for the
next stitch.
The sheaver has a Y shaped groove formed in its periphery, the bottom por-
tion of which has a width not greater than the diameter of the thread to be used,
so that, the crossing of the thread, when wound entirely around said sheave,
causes said thread to be drawn hard into the bottom portion of said groove and
clamped so firmly therein that the thread cannot be drawn therefrom without
rotating the sheave and the sheave, is mounted upon the screw stud set in the
rear end of the arm L formed in one piece with or secured to the sliding bar E³
as shown in Figures 8, 9, and 16.
The sheave has formed upon its periphery, at one side of its thread receiving
groove a series of ratchet teeth with which the stop pawl engages, to prevent a
rearward movement of the top of said sheave when the notched thread nieasuring
rod descends to draw thread from the tension wheel, and a looped wire thread
guard is secured to said arm L in position to prevent the thread being displaced
trom said sheave all as shown in Figures 8 and 9.
M is the shuttle provided with a hook, the point of which is located in a
plane at the rear of and parallel to the plane of the rear face of the main body of
said shuttle, and at a greater distance from its axis of motion than the periphery
of said main body, and also provided with the rearwardly projecting convex loop-
spreading boss, see Figures 23, 26 and 27, and mounted in the shuttle race S
so as to be movable about its axis and having formed therein a circular chamber
to receive the thread holding bobbin S provided with the thread guiding eye
concentric with the axis of motion of said shuttle as shown in Figure 2.
The shuttle race, or holder, is firmly secured in a fixed position to the upper
portions of the standards A and A, and has formed in its front side a
chamber the enclosing side walls of which extend around about four-fifths
more or less of a complete circle, being open at the bottom and provided with the
inwardly projecting lip which with the cap segment 8 embrace the outwardly
projecting peripheral lipt of the shuttle as shown in Figures 5 and 7.
The rear or back plate of the shuttle race has firmly secured thereto the stand N
in bearings in which and in said back plate is mounted the short shaft t' to which
is firmly secured the shuttle carrier, and having formed thereon or secured
thereto the pinion which is engaged by the toothed rack N¹ mounted in guide
ways in said stand N, the block N, and the rear face of the shuttle race or
casing as shown in Figures 6 and 7.
The rack N¹ has formed upon or secured to one end thereof the forked or slotted
block N between the ears of which is pivoted the block, which is engaged by
the forked front end of the lever O fulcrummed at u, and resting near its front
end upon the horizontal plate or bar N, formed in one piece with the column A³
and secured, at its right hand end, to the standard A³ said bar N having secured
thereto the cap bar № to compel said lever O to move in a straight horizontal
direction, as it is vibrated by the action of the cylinder cam fast on the
shaft C, the path of which engages a truck mounted on a stud set in the under
side of said lever O at Figure 1.
The standard A has pivoted thereto, at ³ Figures 4, 19, 20, 21, the lever P.
having adjustably secured in its upper end the curved thread finger v, provided
at its end with the 11….

page_text: ment of said needle engaging the thread, between the work and the looper and
bending it out of a straight line as shown in Figure 19 thereby placing it in a
better position to insure its being laid into the barb of the needle at the proper
time.
At this time the thread 2 extends from the top of the tension wheel J* to the
top of the sheave in a straight line and the brake shoe g is pressed upon the
thread on said tension wheel to firmly clamp said thread thereto and prevent it
being pulled therefrom or from the wax-pot.
The feed slide D, the awl and its carrier is then moved toward the left, to
feed the work, until the awl and needle occupy the same vertical plane, the
presser-foot having been previously raised, to relieve the pressure on the
work, by the reaction of the spring eacting upon the lever E.
The brake shoe is now raised, to relieve the pressure upon the thread on the
tension wheel, and simultaneously the needle begins to descend, or move toward
the work, and when the point of the needle has nearly reached the point of the
awl, the awl begins to recede and the needle follows it through the same hole
from which the awl is being withdrawn, until the needle has reached the limit
of its downward movement which is a little in advance of the completion of the
downward movement of the awl, during which time the thread measuring fork r
has descended upon the thread 2 between the sheaver and the tension wheel J*
and depressed if so as to draw from said tension wheel and the wax-pot a suffi-
cient amount of thread for the next stifch, the thread guiding sheaver being
locked, by the pawl against rearward revolution, so that the thread cannot
be drawn from the slack at the front of the machine.
The looper is now carried around the end of the needle to lay the thread into
the barb thereof as shown in Figure 20 during which operation the needle and
awl both begin to move upward and the thread finger v moves forward into the
position shown in Figure 21, when the bight of thread carried thereby is dis-
charged therefrom by said forward movement, and as the thread measuring
fork is carried by the same lever D³, which imparts motion to the awl segment,
said fork begins to rise at the same time that the awl begins to move upward.
The needle continues its upward movement, carrying in its barb a loop of
thread, till it reaches the limit of its upward movement, as shown in Figure 22
at which time the brake shoe has descended upon the thread to clamp it to the
tension wheel, to prevent the thread being drawn from said tension wheel and
the wax-pot, while the shuttle is opening and passing through the loop of thread
held by the barb of the needle.
The upward movement of the awl is arrested before its point reaches the level
that would be occupied by the upper surface of the work support, when in its
lowest position, so that the work may be inserted between the presser-foot and
work support; by depressing said support by means of the hand lever G without
being obstructed by the awl.
The shuttle is now moved forward, the point of its hook, which occupies and
moves in a plane parallel to and at the rear of the rear face of the shuttle, and
projects beyond the circle of the periphery of the main body of
the shuttle, enters between the two strands of the loop held by
the barb of the needle as shown in Figure 23 and opens said loop,
without the aid of any other loop opener, and passes through the same,
drawing thread from the sheaves 4, 5, and 6, to supply the amount necessary for
the enlargement of the loop, through which the shuttle is passing, an upward
movement of the lever R at this time giving off the necessary thread for the
purpose without drawing from the tension wheel.
When the shuttle has finished its forward movement and is in the position
shown in Figure 24, the lever R is moved suddenly downward to discharge the
loop from the shuttle and the barb of the needle, and to set the stitch, the
thread being clamped to the tension wheel so that no thread can be drawn there-
from by said downward movement of the lever R.

page_text: •
which engages the thread 2, between the looper and the work support, and carries
it to the rear, said hook moving in an arc of a circle in a plane parallel with and
in near proximity to the plane of movement of said needle as shown in
Figure 19, and holds it in said retracted position until the looper n has carried
said thread around the needle and deposited it in the notch of the needle barb,
the lower end or rear end of said lever l' having pivoted thereto one end of the
link 1, the other end of which is pivoted to the rear end of the lever P, ful-
crummed on a stud set in the standard A2, and having pivoted to its other end
one end of the link 1, the other end of which is pivoted to the front end of the
lever Q, Figure 4 fulcrummed upon a stud, set in an ear w Figure 1 projecting
upward from the bar N and carrying at its rear end the truck which is acted
upon by the face cam w², formed upon the periphery of the cam disc C¹, to move
said lever Q about its fulcrum in one direction, the spring to serving to hold said
truck in contact with said cam and move said lever in the opposite direction.
The base plate A has formed upon its front edge near the standard A' an out-
wardly projecting car to which is firmly secured in a fixed position the stand-
like plate, by means of the horizontal stud upon which is mounted, so as to
be movable about said stud, the lever R, to which is pivoted one end of the link
or rod the upper end of which is pivoted to the front end of the lever R³ ful-
crummed at its rear end on the pin h and carrying between its two ends a cam
truck w' which fits into, and is acted upon by the path cam w formed in the sidų
of the cam disc C³, but shown only in dotted lines in Figure 3.
The plate has pivoted thereto at z the lever S* having set in its front end a
fixed stud upon which is mounted the revoluble thread guiding sheave 3, said
lever being normally held, by the tension of the spring, with its front end in
the raised position, and its rear end in contact with the stop pin *³ as shown in
Figure 5.
The front end of the plate o has mounted thereon the sheave 4, and the lever l
has mounted upon studs set therein the sheaves 5 and 6 as shown in Figures 2,
4, 5 and 19.
Each of the sheaves 4, 5 and 6 are enclosed in cup-like casings 7 which are
clamped to the plate and lever I respectively so as to be non-revoluble relativo
thereto and are provided with peripheral slots 8 Figure 11 through which the
thread 2 passes to and from said sheaves, as shown in Figures 2, 4, 5, 11 and 19.
The thread 2 after leaving the wax-pot (not shown) passes to and once around
the tension wheel, thence to and once around the sheave r¹, thence over the
sheave 3, under the sheave 5, over the sheave 4, under the sheave 6, then through
the eye of the looper and thence to the work as shown by the dotted line 2 in
Figures 3, 4 and 5.
The operation of my invention is as follows:-
The several parts of the machine being in the positions shown in Figures 1, 23,
4 and 5 of the drawings, the operator presses the lever & towards the rear, to
raise the front end of the lever F, and unlock the bar E and retract said bar to
depress the work support I, the work is then placed upon the work support and
beneath the presser-foot d', when the lever G is released, and the reaction of the
spring f¹ causes the work to be firmly clamped between the presser-foot and said
work support and the tension of the spring causes the locking lever F to
firmly lock said bar E against backward movement, and thus firmly hold the
work support in said clamped position.
Now if the wheel C be revolved in the direction indicated by the arrow on
Figure 3 the first effect produced is to move the shuttle M from the position
shown in Figure 2 to the position shown in Figure 24, i.e. through an arc
approximating two hundred and seventy degrees during which time the awl a'
has pierced the work from below, the shuttle then returns to the position shown
in Figure 2, during which time the needle remains in its upper-most position,
and the upper end of the thread finger is moved backward describing an arc
of a circle in a plaue parallel with and in near proximity to the plane of move-

page_text: mounted in a fixed bearing; a shuttle carrier secured to said pinion within said
raceway; a reciprocating rack mounted in fixed bearings; a lever and cam, for
reciprocating said rack, proportioned and timed to impart to said shuttle a for-
ward movement approximating three-fourths of a revolution, and a correspond-
ing backward movement, with a standstill after each movement.
3rd. In a lock stitch sewing machine the combination with a curved barbed
needle, a curved awl, an awl work-feeding mechanism, a looper, and mechanism
for moving said looper around the needle, of mechanism for imparting to said
needle downward and upward strokes, each complete in a single movement,
with a standstill after each movement; a fixed racoway, located above the
needle a shuttle mounted in said raceway and arranged to oscillate in a plane
at right angles to the plane of reciprocation of said needle, with the point of its
hook in a plane at the rear of and parallel to the plane of the rear face of
said shuttle, and at a greater distance from the axis of motion of said shuttle than
the periphery of the main body of said shuttle and in position to intersect the
path of the needle; and means for imparting to said shuttle intermittent move-
ments, in opposite directions, through arcs approximating two hundred and
seventy degrees.
4th. In a lock stitch sewing machine, the combination with a curved barbed
needle, a curved awl, an awl work-feeding mechanism, a looper and mechanism
for moving said looper around the needle, of mechanism for imparting to said
needle downward and upward strokes, each complete in a single movement, with
a standstill after each movement; a fixed raceway located above the needle; a
shuttle mounted in said raceway, and arranged to oscillate in a plane at right
angles to the plane of reciprocation of said needle, with the point of its hook
in a plane at the rear of the plane of the rear face of said shuttle and in posi-
tion to intersect the path of the needle, and provided with a bobbin receiving
chamber, a thread delivering orifice through the peripheral wall of said chamber,
and a thread guiding eye located in the axial line of said shuttle, said thread
delivering orifice and thread guiding eye both always being in a plane cutting
longitudinally through the axis of said shuttle and which plane is substantially
vertical when said shuttle has completed its forward movement; and means for
imparting to said shuttle a forward movement, of approximately three-fourths
of a revolution, and a corresponding backward movement, with a standstill after
each movement.
5th. In a lock stitch sewing machine the combination with a curved barbed
needle; a curved awl, means for reciprocating said needle and awl, and awl
work-feeding mechanism, a looper and means for moving the thread carrying
end of said looper around the end of the needle when in its lowest position, a
thread manipulating finger; means for operating the same, cooperating with the
other elements of the stitch forming mechanism to discharge the thread from
the barb of the needle; an oscillating shuttle mounted in a suitable raceway
above said needle with the point of its hook in position to intersect the path of
the needle, and in a plane at the rear of the rear face of the main body of
said shuttle, and at a greater distance from its axis of motion than the periphery
of the main body of said shuttle; means for imparting to said shuttle a forward
and a backward movement through an arc of about two hundred and seventy
degrees with a period of rest after each movement, and means to maintain the
needle in a fixed position at the extreme of its upward movement while the
shuttle makes both its forward and backward movement.
6th. In a lock stitch sewing machine the combination with a curved needle
provided with a barb upon its side toward which the shuttle moves to enter the
loop, a curved awl, means for reciprocating said needle and awl, an awl work-
feeding mechanism, a looper and means for carrying the thread carrying end
of said looper around the end of the needle when in its lowest position; an
oscillating shuttle constructed and arranged to enter, open, and pass through
the loop of thread, drawn through the work by the needle; a brake or clamping

page_text: The thickness of the sole determines the length of thread required to form a
stitch, and as the fore-part of the sole is often thicker than the shank it is
desirable that the amount of thread drawn from the tension wheel and the source
of supply should be proportioned to the thickness of that portion of the sole
which is for the time being clamped between the work support and the presser
foot, and this is automatically accomplished in this invention in the following
manner:
When a thin portion of the sole as the shank is between said foot and support,
said support the bar EL, and the sheave, are in the position shown in the
drawings, and the bar EL is locked, by the lever F, at the time the needle is
passing downward through the sole, the sheave is locked against backward
revolution and the thread measuring fork r descends upon the thread, between
said sheave and the tension wheel J, and depressing it draws
thread from the tension wheel and the source of supply sufficient to form
a stitch. When the material is being fed the pressure of the lever F upon the
bar is relieved and as the thicker portion of the sole is fed between the
presser-foot and the work support said support is depressed thereby moving the
bar EL toward the rear, and thus moving the sheave nearer to the tension
wheel, and as a consequence the next descent of the thread measuring form r
draws a greater length of thread from the tension wheel and the source of
supply.
When the work is being fed from a thick to a thin portion the reverse action
takes place.
The shuttle M has a pear-shaped opening 9 extending through the
same from front to rear, outside of the bobbin receiving chamber, and is pro-
vided with the thread delivering orifice 9*, extending through the wall of said
bobbin receiving chamber to said pear-shaped opening, and has secured in said
opening the leaf spring 10, arranged to press upon the shuttle thread between
Baid delivering orifice and the front face of the shuttle, as shown in Figure 24.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated
to me by my foreign correspondent, I declare that what I claim is:-
1st. In a lock stitch sewing machine, the combination with a curved barbed
needle and a curved awl, constructed and arranged to enter the work from oppo-
site sides thereof, a looper for delivering the thread to the barb of the needle,
and means for feeding the work, while the awl is inserted therein, of a stitch
setting lever; an oscillating shuttle arranged to move in a plane at right angles
to the plane of reciprocation of said needle, said shuttle having the point of
its hook in a plane at the rear of and parallel to the rear surface of the main
body of the shuttle, and also at a greater distance from its axis of motion than
the periphery of the main body of said shuttle and in position to intersect the
path of said needle, and provided upon its rear face at its periphery and about
ninety degrees from the point of its hook, with a convex boss, or rearward pro-
jection, adapted to increase the expansion of the loop just at the end of the
forward movement of the shuttle and thus assist the dischargo of the thread
from the barb of the needle, when the stitch setting lever is moved downward
to draw the loop from the shuttle; and means for imparting to said shuttle a
forward movement approximating three-fourths of a revolution, and a corre-
sponding backward movement, with a stand-still at the end of each movement.
2nd. In a lock stitch sewing machine, the combination with a curved barbed
needle, and a curved awl, constructed and arranged to enter the work from
opposite sides thereof, a looper for delivering the thread to the barb of the
needle, and means of moving the awl laterally to feed the work, of an oscillating
shuttle arranged to move in a plane at right angles to the plane of reciprocation
of said needle, with the point of its hook in a position to intersect the path
of the needle; a suitable raceway for said shuttle; a pinion and its shaft

page_text: device to prevent the thread being drawn from the source of supply while the
ahuttle is passing through the loop of thread held by the barb of the needle; a
pivoted sheave carrying lever; a system of thread guiding sheaves arranged
between said clamping device and the work support; and means for intermit-
tently vibrating said sheave carrying lever, constructed, arranged, and timed
to raise said lever while the shuttle is passing through the loop, to give off
thread to enlarge said loop, and then move said lever abruptly downward when
the shuttle has completed its forward movement, to set the stitch.
7th. In a lock stitch sewing machine the combination of a curved needle pro-
vided with a barb upon the side thereof toward which the point of the shuttle
hook moves to enter the loop of thread held thereby, and with a groove on its
front or convex side extending in a straight line from said barb to its point;
means for reciprocating said needle in a curved path; an oscillating shuttle
located above said needle with the point of its hook in position to intersect the
path of said needle; and means for intermittently oscillating said shuttle
whereby said shuttle is adapted to enter, open and pass through the loop of
thread held by the barb of said needle.
8th. In a lock stitch waxed thread sewing machine, the combination with a
frictional tension wheel, of a thread guiding sheave in near proximity to said
tension wheel; means for locking said sheave against backward revolution; a
thread measuring finger arranged above a line tangent to the top of said sheave
and tension wheel, and having its lower end forked or notched to engage the
thread between said sheave and tension wheel in near proximity to said tension
wheel; and means for reciprocating said finger, and causing it to engage and
depress said thread below a line tangent to said tension wheel and sheave, and
thus draw thread from said tension wheel and the source of supply.
9th. In a lock stitch waxed thread sewing machine, the combination with a
frictional tension wheel, and a work support and presser-foot co-operating to
clamp the work, of a thread guiding sheave in near proximity to said tension
wheel but between it and said work support, freely revoluble in a forward
direction; means for locking said sheave against backward revolution; a thread
measuring finger arranged to engage the thread between said tension wheel and
sheave; means for reciprocating said finger and causing it to depress said thread
to draw thread from the tension wheel and the source of supply; and mechanism
between the axis of said sheave and the work support constructed and arranged
to cause the downward and upward movements, respectively, of the work sup-
port, due to varying thicknesses of the work, to move the axis of said sheave
toward and from said tension wheel, and thus cause the amount of thread drawn
from said tension wheel to correspond with the amount required to form a stitch.
10th. The combination of the fension wheel Ja; the pivoted lever K, provided
with a cam-truck; a cam constructed and arranged to act upon said truck to
move said lever in one direction; a spring to move said lever in the opposite
direction; a brake-shoe carried by said lever, and arranged to engage and clamp
the thread on said tension-wheel; the reciprocating bar L; the sheave r¹ pro-
vided with ratchet teeth and mounted upon a stud set in said bar L; a pawl
to lock said sheave against backward movement; the lever 13 provided with the
cam truck a; the measuring finger carried by said lever D³, and having its
lower end forked or notched, as set forth; and the cam path b¹ to act upon and
vibrate said lever, all substantially as described.
11th. The combination of the pivoted work support EE; the sliding bar E³,
and extension L; the locking lever F; the cam for operating said locking
lever; the sheave provided with ratchet teeth; the pawl; the tension
wheel J; the lever D³; the measuring finger r carried by said lever; and the
cam path for operating said lever and finger.
12th. In a lock stitch sewing machine a shuttle constructed and arranged to
move about its centre and provided with a bobbin receiving chamber, a loop
engaging hook, the opening 9 through the same, and the thread delivering per-

page_text: foration 9 between said chamber and opening, in combination with a bobbin
fitted to and revoluble in said bobbin receiving chamber and constructed and
arranged to be filled with thread to be unwound from its periphery; the
spring 10 located in said opening 9, and arranged to press toward the axis of
the shuttle, and bear upon the thread between the delivery opening and the &
front face of the shuttle; and the thread guiding eye S located in the axial line
of said shuttle.
13th. In a lock stitch waxed thread sewing machine a shuttle constructed and
arranged to be moved about its centre and provided with a loop engaging hook,
and also having a convex boss on its rear face about ninety degrees from the
point of the loop engaging hook, the outer edge of which projects beyond the
periphery of the main body of the shuttle as and for the purpose specified.
Deted this 4th day of Tenu 1909
HASELTINE, LAKE & Co,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
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