for Use with Waxed Thread.
Year: 1887

page_text: for Use with Waxed Thread.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
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:-
These improvements have been devised with special reference to their use in that
type of wax thread sewing machines heretofore devised by Duncan H. Campbell, and
disclosed in British Letters Patent Nos. 1795 of A.D. 1878 and 262 of A.D. 1882, but
portions of the said improvements can be employed in other sewing machines.
Certain of the said improvements, are comprised in a novel arrangement, of two or
more stitch tightening fingers, by means of which a minimum of movement is involved
in controlling the slack thread, while the said fingers draw up the standing thread
and tighten or perfect a stitch, thus lessening the shock and enabling the machine to
operate more smoothly and effectually at high speed than is possible with a single
stitch tightening take up arm or finger, as heretofore used.
Various features of the said improvements involve the employment of the said two
or more stitch tightening fingers, in combination with other devices, such as thread
brakes operated by tension on the thread induced by said fingers; also with thread
feeding devices by means of which thread is drawn from the wax pot in advance of
actual requirements; also with springs, in combination with said brakes; and, further
the said improvements involve a novel arrangement of one of the said stitch tightening
fingers, by which, in tightening a stitch, the standing thread is strained by the finger
in a direct line between it and the surface of the work on the work plate; also in so
arranging the said fingers, that although they are oppositely reciprocated yet they are
practically counterbalanced, thus enabling the machine to be safely worked at a high
speed and, still further, in a novel mechanical combination and arrangement, which
;

page_text: includes the said fingers, the brakes, and the thread feeder, and constitutes a simple,
comparatively inexpensive, but effective and durable organization; and still further,
in so coupling the said stitch tightening fingers to their operating lever or levers, that
variations in the vibratory movement of one of the said fingers may be readily made,
for variably locating the bight between the two threads of a lock stitch within the
material to be sewed.
Further this invention comprises novel features in the construction of the wax pot,
whereby the wax cannot overflow and cannot get overheated and thereby injured, by
the loss of valuable volatile matter therein, and the thread in its passage through the
wax is not exposed either to floating, or sedimentary extraneous matters which are
liable to exist in hard wax compounds.
In the hereinhefore mentioned Letters Patent No. 262 of 1882, the feed slide was
described as being controlled by a lever having a pin latch, and a segmental plate
having holes with which the pin of the latch engaged. This construction, while
thoroughly effective, precluded specially fine variations in feed because of the space
necessarily required for the said pin holes but according to my invention the plate is
provided with V-shaped notches, and the lever with a latch having correspondingly
shaped notches, thus enabling a fine graduation in feed to be obtained.
Other portions of the said improvements, are applicable beneath the arched work
plate shown in said Letters Patent No. 262 of 1882, one feature consisting in providing
the arched shuttle rail with steam heating passages, and mounting the shuttle on the
said rail in such a manner that heat is directly imparted to the shuttle and its
contents.
Other portions of the said improvements include certain novel appliances on the
shuttle, by means of which uniform tension on the shuttle thread is secured and wide
variations in tension readily provided for.
In describing these improvements, special notice will only be given to those parts
of the machine, which are intimately connected with each feature of the present
invention, it being understood that, in matters of substance, the portions of the
illustrated machine not herein-after particularly described, are similar to corresponding
portions, fully shown and illustrated in British Patent No. 262 of A.D. 1882.
In the accompanying drawings
Figure 1 represents a side view of a machine embodying all the said herein before
mentioned improvements in a desirable form.
Figure 2, represents a front view of the same.
Figure 3 represents another side view (opposite to that shown in Figure 1) of the
same.
Figure 4 is an enlarged side view of the upper portions of the machine illustrating
the stitch tightening take up fingers, and their operating mechanism.
Figure 5 is a similar view to figure 4, but showing the operative parts in different
positions.
Figures 6 and 7, illustrate a complex lever, to which the said fingers are coupled.
Figures 8, 9 and 10 illustrate variations in the construction and arrangement of the
said fingers.
Figure 11, illustrate the application of double acting stitch tightening fingers to
the head of another type of machine.
Figure 12 is a top or plan view of portions of the machine including the wax pot.
Figure 13, is a lateral vertical section of the same on line a, a, Figure 12.
Figure 14, is a front view of the arched shuttle rail beneath the arched work
plate.
Figure 15 is a lateral section of the same, and also of the said work plate, and of
a shuttle in position for use.
Figures 16, 17, 18 and 19, illustrate the improved shuttle, for use in this machine.
Those improvements which pertain to the stitch tightening fingers, by which stitches.
are completed or perfected, will be first-described.
In Figures 1 to 5 inclusive, these fingers are shown above the head A, of the
machine, and are designated B, and B. They may be mere loops, or eyes, but in

page_text: their best form they are thread pullies, mounted on properly moved supports. If the
finger B, were stationary, and the finger B¹ only movable, they would be similar to
those in the herein before mentioned prior Patent, but here, both are simultaneously
movable in opposite directions so that the opposite movement of both, to a small
extent, serves the purpose of either, if it only be moved to a greater extent. When
the finger B, pulls downward upon the thread a', Figure 4, the finger B, pushes
upward, and thus the thread is controlled in two short bights, instead of one long one,
and the finger B pulls upward on the standing thread a in a direct line from the work
resting on the work plate A¹. Unlike mere take-up arms, as used for merely controlling
slack thread, in some prior dry thread machines while the needle tightens a stitch
these arms B, and B', actually tighten and perfect each stitch, and as they sometimes
operate with a driving strain the equivalent of many pounds in weight, they must be
accompanied by a reliable braking contrivance, which restricts all moving action in
the thread, to that portion thereof which may underlie the work plate, the standing
thread a, and also that which is engaged by the stitch tightening take-up fingers.
The brake C here shown, is actuated, in clamping the thread, by the strain thereon,
induced by the action of the thread fingers B, B¹.
The finger B is mounted upon the outer end of a walking beam lever b, fulcrumed
at 6 on a bracket on top of the head A. The finger B' has its axis or stud fitted to
slide in a vertical slotted standard 62. Both of the said fingers, B and B', are coupled
to a complex lever c by the links 63 and 64, and lever these connections being at
different points on the said lever c, so that the one movement of the latter causes the
fingers to reciprocate in harmony, or synchronously, in opposite directions as indicated
in Figures 4, 5, 6 and 7.
This complex lever c is composed of two parts c¹ and c². The main part c¹ is an
arm or lever keyed at one end to a rock shaft d, and this has an arm d', outside of the
head A, as shown in Figure 1. At its free end the said arm is connected with a
lever d², fulcrumed at ds on a rock shaft, and connected, by a link d, with a pivoted
arm d³, on the rear end of the machine, having a roller stud or pin, which occupies a
cam groove on the inner face of the balance wheel D.
The auxiliary part c² of the said complex lever is a separate arm or lever, parallel
with the part, c¹ and pivoted at one end on a stud c³ laterally projecting inward from
one side of the head A. The finger B is connected with the part c¹ and the finger B₁
with the part c², at its outer end. These two sections or parts c' and are each
provided with a slot, and these slots are so far coincident with each other that both
can be occupied by a coupling block e of peculiar construction. Considered as a
whole the said block includes a rectangular block e¹ which slides freely in one of said
slots; as shown in Figure 7, a flanged nut e² having two straight sides fitted to the
other of the said slots also a washer e interposed between the two levers or arms c¹, c²,
also between the block e', and the flanged nut e², and finally, a central pivot bolt or
screw which firmly locks the washer and flanged nut to one arm, and renders them
immovable thereon, but permits the block e' to have a free rocking movement on the
round shank of the said screw or bolt, during the vibration of its arm c², and a
consequent sliding movement, in the slot of the said arm.
It will be obvious, that while the finger B has a uniform range or extent of vibra-
tion, the finger B¹ can be varied, in extent of movement, by varying the position of
this coupling block in the slots of the two arms or levers which constitute this
complex lever c; and also that the said block is made accessible by way of the
opening at e, in one side of the head as shown in Figure 1. This capacity for adjust-
ment of the stitch tightening fingers, enables the accurate location of the bight, of
two threads in a "lock stitch," at any desired point within the fabric, for instance, if
three thicknesses of leather are to be sewn, the said bight may be located in the centre
of the middle thickness, or at any other point either above or below the centre of
the pile.
The thread brake C, best shown in Figures 4 and 5, consists of a pivoted arm f
having at one end a thread eye (f' and at its opposite end a clamping
face which engages with a fixed brake block f³ having a properly corresponding

page_text: clamping face the said faces or jaws being concavo convex so as to thoroughly
clamp the thread between them without liability of injuring it. The thread a',
passing through the jaws of the brake, through the eye funder the finger B',
and over the finger B it follows that when the said fingers are operated the thread
is strained and the brake effectively operated by the tension on the said thread
induced by the said fingers, and therefore all movement of the thread is restricted to
that portion of the thread which extends to, or beneath, the work plate A¹, from the
jaws of the said brake.
Although it is not absolutely essential yet it is best to provide the said brake with a
retractile spring, which is secured at its lower ond to the head A, and, at its upper
end, to the underside of the said brake arm f, so that it shall always exert a light
initial clamping pressure on the thread, and therefore, if the thread chance to be
unduly slippery, the tension thereon, due to the action of the stitch tightening fingers,
is supplemented by the said spring at the initial straining of the thread by the said
fingers.
The wax pot E, will be hereinafter described in detail, but it is now referred to in
order to trace the course of the thread from its thread delivery head g to the brake C.
The path of the thread a', through the wax pot as shown in Figures 12 and 13,
is at right angles to its path, while passing through said brake. The turning point,
after leaving a stationary eye g², is at a thread feeder arm h, which is an offset
projection from the rear end of the rocking beam lever the said arm h, having
a lateral eye at through which the thread passes, and thence through a thread
eye h² on the arm i of an auxiliary thread brake C, which, like the brake C, is
composed of the said pivoted brake arm i, having a clamping face f³, cooperating
with a fixed block. When the thread feeder arm h descends, it firmly sets the
thread feeder brake C¹ by straining on the thread so as to clamp it between the
jaws thereof, and hence, during the main portion of the said descent, the thread
will be pulled from the wax pot, through the head g. in just such quantities or
lengths as may be required for forming a stitch. For enabling the brake C", to
operate with absolute reliability as a brake, it has a tail piece f" which projects
into the path of the rear end of lever b, and it has a retractile spring f³ applied
thereto, but said spring must not be permitted to operate when the thread, is to
pass forward to the work plate, and therefore the power of the said spring is over-
come, and the jaws of the brake C', thrown wide open, by the lifting contact of
the rocking beam lever b, with the underside of the tail piece f, during the
forward draft of the thread, and the spring of the brake C, then affords a
desirable degree of tension, favourable to the proper operation of the thread con-
trolling devices near the work plate, but when it is desirable that the latter should
have the thread without such tension, (as is sometimes the case) the thread finger B',
is arranged to lift the brake arm f, in a manner similar to the lifting of the tail
piece f.
Certain modifications of the thread feeder arm, and its brake, will be hereinafter
described.
The wax pot here shown, embodies certain novel features. If hard wax be
unduly heated, it is injured through the loss of certain volatile matters, essential to
the durability and effectiveness of all hard wax compounds when incorporated with
thread in leather fabrics.
This wax pot has a heavy heating section k provided with a steam jacket or base
and a flaring cooling section ', composed of thin metal, from which heat can freely
radiate. The gradually increased horizontal sectional area of the pot affords a pro-
gressively increased area of exposure to a rising mass of boiling wax so that it is
practically impossible for hard wax compounds to be either unduly heated, or to boil
over, and as a matter of fact, with ordinary usage, the lower portion of a body of
wax can be maintained in a thoroughly-liquified-condition-which-is-highly-favourable
to the saturation of thread, while the surface of the mass is maintained in a compara-
tively cooled condition, quite unfavourable, to the elimination of the valuable volatile
matter, which should be retained in the wax; and the presence of the overlying cooled

page_text: portion practically precludes the overheating of the underlying liquified portion of the
wax, because of the free radiation, provided for at the sides and top of the said upper
portion.
One of the wax pot heads g has been referred to, and this is located in one side of
said pot, somewhat above the plane of its bottom, and coincident with a similar head g¹,
so that the thread from a ball or spool, can pass directly through the well heated wax
in the pot. These heads g, and g', are provided with flexible packing and glands by
one of which any desired amount of wax may be stripped from the surface of the
thread. The head g' should be set so as to prevent any outward flow of wax, thus
leaving the thread, within the pot, free from undue tensile strain, and therefore in such
a condition as to freely absorb the wax. Floating impurities, liable to occur in all
wax compounds, cannot get into contact with the thread, and the same is true of such
solid matters as will gravitate to the bottom of the cup, and occupy a plane below the
path of the thread, on its way between the two heads."
Referring to Figure 2, it will be understood, that the awl bar, is mounted in a
sliding frame, variably controlled for graduating the feed, as in Patent 262 of A.D.
1882. In that Patent the feed lever is coupled, at one end, to a block which slides
in a slot as here shown but this lever F instead of having a pin latch, has a notched
faced latch, which engages with V-shaped notches on the edge of the segmental
plate thus enabling a closer and finer graduation in feed than is possible with the
pin latch and the holes in the said plate, as shown in said prior Patent.
At the rear of the work plate, on a suitable standard, there is, as shown in Figures 1
and 3, an adjustable gauge G against the front curved face of which the edge of a
shoe sole or the edge of a harness tug, for instance, can be progressively engaged in
order to secure the proper location of a straight line, or, (for instance) in following
the variable contour of a shoe sole.
Referring to Figures 14 and 15, those portions of the improvements which underlie
the work plate A', will be next described.
An arched shuttle rail, is shown in the said Patent 262 of A.D. 1882, and the
rail H, cooperating with the underside of the work plate A' constitutes an arched
shuttle race, as in that Patent, but instead of heating the shuttle, by means of heat
from gas jets, traversing the race as a heating flue, said rail H, is now provided with
steam conducting passages, which not only heat the air in said race so that it still
operates as a heating flue, but also by the direct conduction of heat from the surfaces
in contact with the steam, to and through the body of the shuttle. The needle
aperture in the work plate, whenever unobstructed by work thereon, affords a free
upward escape of heated air, which is highly conducive to maintaining the adjacent
portions of the upper thread in a well softened condition, and it also contributes to
the heating of the adjacent portions of the mechanism.
The arched rail H is mounted upon or is preferably made integral with the
segmental frame plate H', which is mounted in proper position by means of bolts
occupying tapped holes driven from the front side of the said plate, leaving the space
at the rear side of the said plate open, for the two arms of the shuttle carrier levers,
or arms, the said plate being vertically scored centrally, and also through the rail thus
affording a path for the hooked needle and guide bearings for the needle bar.
The upper portion of the said segmental plate, at its front side is provided with
steam passages and while these may be provided for, by means of actual conducting
channels, or ways, either wholly or in part integral within the body of the plate,
equally good results, will accrue from the use of a simpler and less expensive con-
struction.
As shown in Figures 14 and 15 a steam pipe m is bent and curved so as to cover
a substantial portion of the said plate and be in close contact therewith, and pre-
ferably soldered or brazed thereto. With a shuttle I, having a longitudinal groove
occupied by the rail H, on its under-side, it is obvious, that there is a direct con-
duction of heat, to, and through, the body of the shuttle, so as to maintain its contents,
at such a temperature as will be conducive to the best results.
The shuttle, used with this machine, may be of the cop carrying type, as illustrated

page_text: in said Letters Patent 262 of 1882, but in that case it is advisable that the two ends
of the cop chamber be parallel insted of inclined as shown in the said Patent. If the
said ends be parallel, the arched or bent cop, at its upper or convex side, will have
its coils compactly maintained instead of separated, and hence "kinking"
" within the
shuttle will be practically obviated. For meeting general requirements however, a
bobbin shuttle is deemed preferable, and one has been specially devised for use in this
machine, the same is illustrated in Figures 16 to 19 inclusive.
This shuttle is provided with longitudinal webs and an intervening groove on its
underside, and side bearing webs, and also longitudinal webs with an intervening
groove, on top, all generally as shown in the said prior Patent. In this shuttle
however, the delivery of thread from the bobbin, is by way of a slot at n in the side
of the shuttle, and thence through a slot at n' in one of the upper webs, instead of
delivering through the nose, as in the said prior shuttle. Between the upper webs,
and in the longitudinal groove, a tension spring o is mounted and arranged to bear
against the inner surface of one of the webs and to press against the thread, in its
passage from the slot n' beneath a lateral bar or stud p. This spring o is in the form
of a bent lever, having its fulcrum at o¹, bearing against the opposite side of the
groove from that at which the thread is compressed by the operative end of the spring.
The butt end of the spring is thick, and has a tapped hole occupied by a lateral
adjusting screw which is capable of being rotated but is confined in its bearings
against any longitudinal movement, thus precluding all possibility of its accidental
displacement. With this spring a wide range of tension is afforded and it is specially
durable, because at each side of its fulcrum, there is a comparatively short length,
and the reciliency between the fulcrum and the screw is imparted to the free end with
a leverage action.
The bobbin is provided with axial bearings at each end, one of which occupies
a bearing seat within the shuttle, and the other, a similar seat in the cap s, which is
hinged at its lower side and has a spring latch s¹ on top and on its inner face a helical
spring s² which, by its engagement with the coincident head of the bobbin, precludes
any sliding movement of the bobbin within the shuttle, and also serves as a drag for
guarding against any undue rotation of the bobbin, while thread is being drawn
therefrom.
Having thus described the several improvements as embodied in the machine shown,
it is to be understood, that the stitch tightening take-up fingers, may be somewhat
varied in their construction and arrangement, without departure from certain portions
of the invention which pertain thereto. As for instance, as shown in Figure 8, wherein
the fingers B and B are as before described, but are supplemented by a third
finger B2, which is mounted upon the walking beam lever b so as to locate the finger B¹
between it and the finger B thus enabling a stitch to be tightened by a much less
range of opposite movement of the said fingers, than when two fingers are employed.
When thus organized, the brake C is reversed in position, because it is an upward
draft or pull on the thread a', which sets the brake, instead of the downward draft, as
when two fingers are employed.
For still farther lessening the movement of the fingers for performing the same
work an additional finger can be employed as illustrated in Figure 9 wherein the
fingers B B and B are supplemented by the finger B³ this latter being coupled to the
same link or rod as the finger B' and with these fingers the brake C is arranged as when
but two fingers are employed. If the brake C¹ before described, be relied upon for
co-operating with the stitch tightening fingers, it is advisable that a thread-eye be
employed adjacent to the finger nearest said brake as for instance at t as shown in
Figure 10, and preferably provided with a thread wheel, as indicated, thus affording
between the said eye and the finger B a length of thread which_can_be_controlled_by_
a comparatively slight movement of the fingers.
In all of these instances the fingers are well balanced both as to weight and impetus,
as well as to effective strain on the thread and hence they can perform the heaviest
work with but little shock and can be operated smoothly at very high speed.
This feature, of several stitch tightening fingers cooperating in tightening or

page_text: straining the thread in several bights, is applicable to other types of machines, as for
instance as illustrated in Figure 11, wherein a vertical backwardly swinging arm is
provided with two fingers B and B co-operating with a brake of any kind, and an
adjustable finger B, this latter enabling a variable operation similar to that afforded by
the coupling block in the complex lever previously described and it enables a stitch
bight, to be variably located within the fabric or goods, notwithstanding the vibration
of the lever or arm, is fixed, or non variable.
As regards the thread feeder arm, and its adjacent parts, it is also to be understood
that they may also be varied in construction and arrangement without departure from
those portions of the invention which pertain thereto, so long as said arm co-operates
either with a brake of its own, as when it is not operated synchronously with the
stitch tightening fingers, or with a brake which does co-operate with said fingers, and
also prevents the movement of the thread toward the wax pot during the pulling out
movement of the feeder arm.
The machine herein described is well adapted for sewing heavy canvas, as well as
many other heavy fabrics with which hot waxing of the thread is not desirable and
in that event the wax pot being empty its heads can be successfully relied upon for
compressing and even glazing the thread.
In view of certain changes in the construction of this machine as compared with
that shown in Patent No. 262 of 1882 it is deemed expedient to point out the most
prominent variations for enabling a better comprehension of the machine as a whole.
The presser foot K, is provided with a slotted guard which protects the upper of a
shoe from disfigurement by the contact therewith of the vibrating thread arm by
which thread is delivered to the hook needle. The presser foot lifting lever L, is
wholly outside of, and above the head A, and its rear end is coupled as before, by
means of a rod with a treadle, not shown, and the presser foot spring L' is of a
different form and has its adjusting screw at L².
The steam heating pipe m has one terminal at or near a lower side corner of the
machine Figure 3, and the other projects above the head A as indicated at m¹ and m²
the said pipe being continuous, passing downward from m¹ to near the work plate,
where it thoroughly heats the thread fingers, thence rearward down into the base of
the machine thence forward over the face of the shuttle rail plate, and thence outward
at m². The wax pot has also, induction and eduction steam connections m³ and m'.
Outside of the balance wheel, and connected with the main shaft, is a registering
apparatus M, of any suitable variety, which indicates from its several dials, the
number of revolutions made, and the consequent number of stitches presumably
executed.
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
First. In a wax thread sewing machine, the combination with a thread clamping
brake, of a take-up embodying two or more oppositely reciprocated stitch tightening
thread fingers, substantially as described.
Second. The combination of a thread clamping brake, and a take-up embodying
two or more positively operated and oppositely vibrated stitch tightening fingers,
substantially as described."
Third. The combination with a thread clamping brake, operated by tension on the
thread, of oppositely reciprocated stitch tightening fingers, operating as a take-up,
substantially as described, whereby the brake is operated by said take-up, and the
slack thread controlled and strained under a stitch tightening tension in two or more
bights.
Fourth. The combination of a thread clamping brake and oppositely reciprocated
stitch tightening take-up fingers, one of which reciprocated substantially in line with
the thread extending from it to the work plate substantially as described, whereby the
slack thread is taken up in two or more bights, and the stitches tightened by a direct
lift between one of the said fingers and the work plate.

page_text: Fifth. The combination, substantially as hereinbefore described, of oppositely
reciprocated stitch tightening take-up fingers, and an operating lever by which both
of said fingers, are reciprocated and to which one of said fingers is adjustably
connected, whereby stitch bights may be variably located, and a variable quantity of
slack thread taken up in two or more bights.
Sixth. The combination, in a wax thread sewing machine, with a stitch tightening
take-up finger, and a complex lever coupled thereto, composed in part of a main
section slotted at its outer end, and in part of a slotted auxiliary section, pivoted at
one end to the frame of the machine and coupled at its opposite end to the take-up
finger of a pivot block, occupying the slots in both sections of the said complex
lever, and adjustable therein, substantially as described, whereby the two parts or
sections of the complex lever are coupled, and the reciprocation of the finger variably
adjusted.
Seventh. The combination of a thread clamping brake and two or more oppositely
vibrated stitch tightening fingers, coupled to and operated by a single lever, substan-
tially as described.
Eighth. The combination of oppositely vibrated stitch tightening fingers, and a
main lever, to which said fingers are coupled by auxiliary arms or levers, and links,
substantially as described, whereby said fingers and their coupling mechanism, are
counterbalanced during their operation.
Ninth. The combination with the take-up, of a thread clamping brake having a
spring for initially setting it, in contact with thread in its jaws, and provided with a
tail piece, which is engaged by a reciprocating portion of the take-up mechanism for
releasing the thread from the action of the brake, substantially as described.
Tenth. The combination of the thread feeder brake provided with a spring for
initially setting said brake upon the thread, and a tail on the arm of the said brake
projecting into the path of a reciprocating portion of the take-up mechanism sub-
stantially as described, for relieving the said brake at intervals from the action of its
spring, and also releasing thread from the brake.
Eleventh. In a wax thread sewing machine, the combination of a thread clamping
brake, operated by tension on the thread, a wax pot, and a reciprocating arm,
operating exclusively as a thread feeder between said brake and the wax pot,
substantially as described.
Twelfth. In a wax thread sewing machine, the combination with a wax pot, of a
reciprocating thread feeder arm, and a thread clamping brake operated by tension on
the thread induced by said feeder arm, substantially as described.
Thirteenth. In a wax thread sewing machine, the combination with a wax pot, of a
reciprocating stitch tightening take-up finger, a reciprocating thread feeder-arm
operating synchronously with said take-up finger, and a thread clamping brake
operated by tension on the thread, during the operation of the take-up, and also
during the operation of the thread feeder-arm, substantially as described.
Fourteenth. The combination in a wax thread machine, of the feed adjusting lever,
a latch thereon, baving one or more V-shaped notches, or serrations, and a segmental
plate having a series of notches, or serrations corresponding to those on the latch,
substantially as described.
Fifteenth. The combination substantially as described, of a shuttle rail having a
steam conducting passage by which said rail is highly heated, and a shuttle mounted
on said rail, and provided with parallel webs forming a groove occupied by said rail,
whereby a direct conduction of heat is secured between the surfaces in contact with
steam, and the interior of the shuttle.
Sixteenth. The shuttle provided with the longitudinal webs on its upper side
affording an intermediate groove, and having within said groove, a tension spring,
bearing toward one side of the groove, and provided with an adjusting screw,
substantially as described.
Seventeenth. The combination with the shuttle longitudinally grooved on its upper
side, of a spring in the form of a bent lever, bearing with its face toward one side of
said groove, and having its fulcrum bearing against the opposite side, and a rotative

page_text: adjusting screw tapped to the rear end of said spring and confined against longitudinal
movement, substantially as described.
Eighteenth. The wax pot composed of a lower section specially adapted as a heating
section, and an upper section specially adapted as a cooling section, substantially as
described, whereby hard wax compounds may be well heated in said heating section,
without liability of overflow or an undue waste of valuable volatile matter.
Nineteenth. The thread waxing pot, provided with coincident tubular heads in the
sides of the pot, and above the bottom thereof, substantially as described whereby
thread may be passed into and through the most favorably heated portion of a mass
of wax,
and prevented from contact with floating and gravitating extraneous
matter, as set forth.
n
501 1
2
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicants.