Year: 1887

page_text: Date of Application, 11th June, 1887
Complete Left, 10th Mar., 1888
Complete Accepted, 18th May, 1888
1, HENRY HARRIS LAKE of the firm of Haseltine Lake and Co. Patent Agents
Southampton Buildings in the County of Middlesex do hereby declare the nature of
this invention to be as follows:-
This invention relates to sewing machines of the class described in the Specification
of British Patent No. 12,209 dated October 13, 1885, in order that greater speed may
be attained with less shock and consequently less wear.
It is a great desideratum to attain high speed in sewing machines, especially for
factory work, and a machine having an eye-pointed needle and rotating book or loop-
taker to be run at high speed and to be practical must have its running parts balanced,
and the needle actuating mechanism as well as the mechanisin for rotating the book or
loop-taker must be driven by rotary rather than by oscillating shafts for thereby the
speed may be greater and the wear as well as the power may be less.
The machine embodying the present invention has in the overhanging arm a rotary
needle-bar actuating shaft provided with integral quartering cranks, the said quartering
cranks being joined by connecting-rods to two other quartering cranks forming
integral parts of a shaft parallel to the needle-bar actuating shaft but located below tho
bed-plate, the forward end of the shaft below the bed-plate through a variable motion
mechanism of usual construction, rotating an auxiliary short shaft parallel thereto,
said short shaft having a cradle or driver to rotate the hook or loop-taker employed to
engage, distend and pass the loop of needle-thread about a bobbin carrying the under
thread.
By providing the shafts referred to with cranks rather than with eccentrics, and
making the wrists of the cranks as small as possible consistent with strength I am
enabled to attain for the machine high speed with but the minimum friction, for the
smaller the wrists the less the friction at high speed.
By making the cranks of the shafts integral therewith I am able to ensure greater
strength and stiffness, which ensures accuracy of movement,

page_text: To compensate for wear between the wrists of the cranks and the connecting-rods
joining them 1 have mounted one end of one of the crank-shafts in a vertically
adjustable bearing, it being made adjustable toward the needle-bar operating shaft to
compensate for the shortening of the connecting-rods due to refacing the caps which
embrace one half of each wrist.
To avoid wear between the rotating hook or loop-taker and the loop taker guide I
have provided the said guide with a series of plugs against which the periphery of the
loop-taker runs, the said plugs being preferably of an anti-friction material such for
instance as raw-hide.
The hook or loop-taker employed is moved at a differential or variable speed during
cach rotation, to thus enable the rotating hook or loop-taker actuated by the crank-
shaft located below the bed-plate, to be rotated at greatly increased speed from the
time the loop taker takes the loop of needle thread and casts it off, this being
done while the take-up is descending, the latter rising as the loop is being cast off
and completing its ascent and the stitch before the needle in its next descent reaches
the goods.
In the patent referred to, the feed driving-shaft was operated by a rock-shaft having
a slotted segmental arm, the said rock-shaft being moved by means of a face cam
which receives in it a roller-stud mounted on an arm of the said rock-shaft, but such
construction has been found objectionable in a very high speed machine because of
rapid wear and noise.
In a very high speed machine, the rock-shaft carrying the segmental arm referred
to when effecting the feeding movement of the feed-bar must be moved positively and
during a certain definite portion of each rotation of the needle-bar actuating shaft,
but to do this unerringly within the specified time and with that class of cam known
as triangular, it being preferred because of its lightness and durability, we have been
obliged to so locate the centres of the said cam and the said rock-shaft that the
actuating point of the said cam when effecting the feeding movement of the feed bar
strikes one toe of a forked arm of the said rock-shaft at a point nearer the centre of the
said shaft than when the actuating point of the said cam strikes the said forked arm to
effect the backward movement of the feeding-bar.
I have combined with the stitch forming mechanism a take-up-lever, and have
provided means for operating it positively.
.
This take-up lever has imparted to it a movement sufficient for the maximum
thickness of material to be stitched, and hence it will be obvious that when the material
is of less than maximum thickness there will be an excess of needle thread to be taken
care of, otherwise the needle thread will fall and be caught under the point of the
needle.
To obviate this difficulty the needle-thread, at a point between the eye of the needle
and the usual tension device, is carried through a yielding or springing arm, the normal
position of which is made variable through the presser-foot and presser-bar and
intermediate devices, so that any excess of slack thread is compensated for, as will be
described.
In this invention the take-up lever will be operated positively and uniformly as to
distance notwithstanding variations in the thickness of the material, but the slack
controlling spring arm will, as stated, be moved variably according to the thickness
of the material.
Operating the take-up positively in both directions enables the machine to be run at
a much greater rate of speed and without liability of over-throw than is possible in a
machine when the take-up is operated in but one direction positively, as in British
Patent No. 12,209 dated Oct. 13 1885. I have combined with the presser-bar,
mechanism for automatically controlling the slack thread which, as the presser-bar is
lifted by variation in thickness of material under the presser-foot, gives up the requisite
amount of thread.
This invention consists essentially in a sewing-machine comprehending the following
instrumentalities viz.: a needle-bar to carry a needle; a rotating needle-bar actuating
shaft provided with quartering cranks; a rotating shaft parallel therewith located.

page_text: below the bed-plate and provided with quartering cranks; an adjustable bearing to
enable the centre of the said shafts to be varied with relation to each other; two
connecting-rods embracing the surface of the said cranks to enable one of the said
shafts to positively rotate the other; a rotating loop-taker; a guide in which the said
loop-taker moves; a short shaft to rotate the loop taker; and a variable movement
mechanism to rotate the said short shaft from the rotating crank shaft located below
the bed-plate, the combination being and operating substantially as described.
Also in a sewing machine, the combination of the following instrumentalities, viz.:
a needle-bar to carry a needle; a rotating double cranked needle-bar actuating shaft;
a cam disc or hub attached to the said shaft; a take-up lever actuated thereby
positively in both directions of its movement; a rotating double cranked shaft located
below the bed-plate and parallel to the needle har actuating shaft: connecting
rods to join the cranks of the said shafts, a short shaft and a rotating loop-taker
actuated thereby ; and means substantially as will be described to impart a variable
speed to the said shaft.
Also in a sewing machine the following instrumentalities; viz.: a feed-bar
j.a rock-
shaft to move it forward and backward positively; a rotating shaft having a triangular
cam to move the feed-bar a rock-shaft having a forked arm provided with toes to
embrace the said cam and also having a segmental arm, the centre of oscillation of
the said rock-shaft and the centre of rotation of the said shaft having the said
triangular cam being so located the one with relation to the other, as to enable the said
triangular cam to move the said rock-shaft at a faster speed while the feed-bar is moving
the material forward than when the said feed-bar is on its backward movement, as will
be described.
Also in the combination with a loop-taker guide of a series of anti-friction plugs to
support the loop-taker as will be described.
Also in a sewing machine having a loop-taker guide and a rotating loop-taker
therein, combined with a segmental cap and with screws and springs located
between the said cap and the inner sides of the heads of the said screws to permit
the said cap to move laterally toward and from the face of the loop-taker
guide.
Also in the combination with the needle-bar actuating shaft, its attached grooved
disc or hub, the overhanging arm and take-up lever, combined with a threaded fulcrum
sleeve having a head, and with a set screw to hold the said fulcrum sleeve in place, as
will be described.
Also in the combination with a sewing machine of the following instrumentalities
viz.; a stitch-forming mechanism, a tension device for the needle-thread, a presser-
foot; a presser bar; a take-up-lever means to operate it positively for material of
maximum thickness; a slack thread controlling spring or arm to act upon the slack
thread between the tension device and the material being stitched; and means between
the presser-bar and the said arm to automatically change its position according to
varying thicknesses of material under the presser, the combination being and operating,
substantially as described.
The frame-work including the hed-plate, standard and overhanging arm are as usual.
The overhanging arm has suitable bearings for the rotating needle-bar actuating
shaft having two cranks set quartering and preferably forged as integral parts of the
shaft.
The wrists of the two cranks are connected respectively by connecting rods to the
wrists of two similar quartering cranks, preferably forged as integral parts of their
shaft located below the bed and parallel to the needle shaft by which shaft a third
shaft is rotated continuously in one direction.
As the parts of the connecting-rods which embrace the wrists of the cranks
referred to become worn in the use of the machine, the caps co-operating with the
said rods and wrists will be removed and be "faced off" thus shortening somewhat
the connecting-rods. To compensate for such shoriening I have made the bearing for
the shaft adjustable, the said shaft being attached to a portion of the bed by two
screws.

page_text: The third shaft at its front end is provided with a disc or wheel having a crank-pin
embraced by a link the opposite end of which embraces a pin of a crank on a short
horizontal shaft having attached to it a saddle the said disc, link, crank, shaft, and
saddle being the same as in the said British Patent No. 12209, the said saddle in
operation rotating a loop-taker substantially such as represented in the said patent the
said loop-taker being arranged to be rotated in a loop-taker-guide, the loop-taker
entering the loop of thread thrown out from the eye of the eye-pointed needle attached
to a needle-bar all as in the said patent.
This loop-taker-guide is provided with a circular recess the surrounding flange of
which has numerous smail radial holes which receive in them antifriction plugs
preferably of raw-hide, the said plugs being inserted through the said holes so as to
present their ends for contact with the periphery of the look-taker the said plugs
being fitted snugly in the holes so as to prevent them from being exposed to atmospheric
changes, except at their extremities, the employment of the raw-hide as small plugs
enabling any part of the wearing surface formed by them to be adjusted or removed
readily.
The loop-taker is retained in the open space of the loop-taker-guide by means of a
rigid cap which is secured to the said guide by screws the said screws being surrounded
between the undersides of the heads and the outer face of the rigid cap, by spiral
springs which enable the cap to be moved outwardly bodily away from the front of the
loop-taker-guide should the thread for any reason be caugh within the said guide.
The two screws holding the rigid cap are located substantially in a horizontal line
drawn through the centre of rotation of the loop taker, thereby leaving the said cap
pressed against the loop taker-guide by a force due to the springs free to yield or move
bodily away from the loop-taker-guide at any part thereof.
I will now describe the mechanism for operating the feed-bar.
The feed-bar is jointed at one end to an arm of a feed driving rock shaft a second
arm of the said rock-shaft having jointed to it a radius-bar having a stud upon.
which
is mounted loosely a block which enters a slot or channel in a segmental portion of a
rock shaft mounted to turn in a bearing of the frame, the said rock-shaft having a
forked arm provided with two toes which are extended in the same direction to embrace
a triangular cam the said cam moving the said rock-shaft and its segmental portion
positively in both directions, rocking the shaft more or less according to the position
of the block in the groove of the segmental portion the said block being made adjustable
therein toward and from the centre of the rock shaft by means of a stitch-regulating
lever attached to the ouier end of a short rock-shaft having at its inner end an arm
which by a link is connected to the radius-bar the further the block from the centre of
the shaft the longer the stitch and vice-versa.
The upward movement of the feed-bar is effected by an arm of a feed lifting rock-
shaft having an arm forked at its inner end, to embrace a triangular cam forming
part of a disc.
The hub of the said arm is split and the two parts of the hub so formed are entered
by a clamp screw which passes freely through the main body of the hub.
The clamp screw enables the arm to be adjusted on the shaft to vary the point of
ascent and descent of the teeth of the feed-bar.
The arm at its inner end carries a roll, which, enters a groove cut into the feed bar
at its under side, a rod serving as a guide for that end of the feed-bar farthest from
the operator, and preventing lateral movement thereof.
A spring holds the free end of the feed bar down upon the roller.
The needle-bar-actuating-shaft at its front end, has a disc provided with a crank-pin
upon which is placed one end of a link, the opposite end of the link embracing a stud
on a block attached to the needle-bar in usual manner.
The disc at its periphery is provided with a cam groove which receives a roller or
other stud attached to the take-up lever, which is of bell-crank shape.
This take-up lever is mounted upon a fulcrum sleeve, having a head, and a hollow
threaded shank, the latter entering a hole in the take-up lever froui its inner side.
The end of the said shank abuts against the flat inner end of a hub located at the

page_text: inner side of the overhanging arm, where it is held by means of a set screw the head
of which is exposed at the outer side of the overhanging-arm. Rotation of the said
screw enables the end of the shank of the fulcrum-sleeve to be drawn firmly against
the inner end of the hub and the shank of the fulcrum-sleeve being longer than the
take-up lever is thick, the latter is left free to be moved on the said sleeve without
binding, yet all lateral play of the take-up lever is overcome.
The overhanging arm at its front end nearest the operator is bulged outwardly at the
front side to form a support for the set screw, and the fulcrum-sleeve of the take-up-
lever, so that the periphery of the disc is readily made adjustable to actuate the take-
up-lever, the said projecting portion also concealing from the view of the operator the
greater portion of the take-up-lever and also lessening the liability of oil being thrown
by the disc in its rotation.
The take-up-arm just within the face-plate is provided with a small disc or projection,
which at its rear side is concaved or made cup-shaped to thus prevent the outward
movement of oil along the take-up-arm to soil or come in contact with thread in the
eye of the take-up-lever.
The face-plate has a slotted projection which besides covering the end of the
enlarged portion of the overhanging arm receives through it the take-up-lever.
The face-plate of concave-convex form embraces the shouldered portions of the
bearings for the presser and needle-bars to thus prevent lateral movement of the face
plate.
I have provided the face-plate with an elongated slot the longer end of which is of
greater diameter than the head of the set screw screwed into the hole, so that the said
face-plate may be readily passed over the said screw in position and then be pushed
downward until the smaller or slotted end of the said opening embraces the shank of
the screw, and when brought down to the proper position of said set screw is tightened
to confine the face-plate in place.
In this way to remove the face-plate requires the loosening of but a single screw.
The face-plate has a hub through which is passed a stud.
This stud within the hub is surrounded by a spiral spring one end of which is fixed
with relation to, the studd, while the opposite or free end of the spring is extended
outwardly through a notch in the hub, the outer end of the said spring having an
eye for the reception of the needle thread between the usual tension pulley and the
take-up-lever, the normal position of the free end of the spring being against the
shoulder of a backwardly extended-flange-of-a-washer-the said washer being loose on
the stud at the end of the hub. This flange has a second shoulder, and is recessed at
its periphery.
The distance from the first shoulder to the second shoulder equals the maximum
movement to be given to the free end of the spring to properly control the slack of
the needle thread.
Next outside the loose washer the stud has fast to it a collar which co-operating
with the end of the hub, serves as a guide for the washer to retain it in upright
position.
The outer side of the collar receives against it the usual felt washer and next to it
the tension pulley acted upon in usual manner by the spring controlled by a nut on
the screw threaded outer end of the stud.-
The stud at its inner end is tapped for the reception of a binding screw which by
its head retains on the said stud the gear having an arm the free end of which
extended outward through a slot in the face-plate and enters a notch at the periphery
of the washer.
This gear is engaged by another gear mounted on a screw secured to the inner side
of the face-plate.
The first gear is notched to receive a pin which serves to attach the collar to the
presser-bar so that as the presser-bar is lifted by material under the presser-bar the
gears are partially rotated to turn the notched washer about the stud in the direction
to enable it to give up slack thread, the direction of movement herein given to the
said spring being that which coils it further up-on the stud.

page_text: In this way the thickness of the material is made effective through the presser-foot
and its bar to automatically vary the amount of slack thread given to the needle, the
thicker the material the greater the amount of slack thread given up for the formation
of the stitch and vice-versa.
I have described the shafts as connected by a variable motion device but instead
thereof I desire it to be understood that I may employ any other equivalent well
known devices capable of operating in like manner.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant..

page_text: COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
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 perforined, to be particularly
described and ascertained in and by the following statement:-
This invention relates to sewing machines of the class described in the specification
of former Letters Patent No. 12,209 dated October 13 A.D. 1885 and is designed
to improve the construction of such machines in order that greater speed may be
attained with less shock and consequently less wear.
It is a great desideratum to attain high speed in sewing machines especially for
factory work, and a machine having an eye-pointed needle and rotating hook or loop-.
taker to be run at high speed and to be practical must have its running parts
balanced, and the needle actuating mechanism as well as the mechanism for rotating
the hook or loop-taker must be driven by rotary rather than by oscillating shafts, for
thereby the speed may he greater and the wear as well as the power may be less.
The machine embodying the present invention has, in the overhanging arm, a
rotary needle-bar actuating shaft provided with integral quartering cranks, the said
quartering cranks being joined by connecting-rods to two other quartering cranks
forming integral parts of a shaft parallel to the needle-bar actuating shaft but located
below the bed-plate, the forward end of the shaft below the bed-plate through a
variable motion mechanism of usual construction, rotating an auxiliary short shaft
parallel thereto, said short shaft having a cradle or driver to rotate the hook or loop-
taker employed to engage, distend and pass the loop of needle-thread about a bobbin
carrying the under-thread.
By providing the shafts referred to with cranks rather than with eccentrics and
making the wrists of the cranks as small as possible consistent with strength I am
enabled to attain for the machine high speed with but the minimum friction, for the
smaller the wrists the less the friction at high speed.
By making the cranks of the shafts integral therewith I am able to ensure greater
strength and stiffness, which ensures accuracy of movement.
To compensate for wear between the wrists of the cranks and the connecting-rods
joining them I have mounted one end of one of the crank-shafts in a vertically
adjustable bearing it being made adjustable toward the needle-bar operating shaft to
compensate for the shortening of the connecting rods due to refacing the caps which
embrace one half of each wrist.
To avoid wear between the rotating hook or loop-taker and the loop-taker guide
I have provided the said guide with a series of plugs against which the periphery of
the loop-taker runs, the said plugs being preferably of an anti-friction material such
for instance as raw-hide.
The hook or loop-taker employed is moved at a differential or variable speed during
each rotation, to thus enable the rotating hook or loop-taker, actuated by the crank-
shaft located below the bed-plate, to be rotated at a greatly increased speed from the

page_text: time the loop-taker takes the loop of needle-thread and casts off, this being done
while the take-up is descending, the latter rising as the loop is being cast off
and completing its ascent and the stitch, before the needle in its next descent reaches
the goods.
In the specification above referred to the feed driving shaft was operated by a rock-
shaft having a slotted segmental arm, the said rock-shaft being moved by means of a
face cam which receives in it a roller-stud mounted on an arm of the said rock-shaft,
but such construction has been found objectionable in a very high speed machine
because of rapid wear and noise.
In a very high speed machine, the rock-shaft carrying the segmental arm referred
to when effecting the feeding movement of the feed-bar must be moved positively and
during a certain definite portion of each rotation of the needle-bar actuating shaft,
but to do this unerringly within the specified time and with that class of cam known
as triangular it being preferred because of its lightness and durability, I have been
obliged to so locate the centres of the said cam and the said rock-shaft that the
actuating point of the said cam when effecting the feeding movement of the feed-bar
strikes one foc. of a forked arm of the said rock-shaft at a point nearer the centre of
the said shaft than when the actuating point of the said cam strikes the said forked
arm to effect the backward movement of the feeding bar.
I have combined with the stitch forming mechanism a take-up lever and have
provided means for operating it positively.
This take-up lever has imparted to it a movement sufficient for the maximum
thickness of material to be stitched, and hence it will be obvious that when the
material is of less than the maximum thickness there will be an excess of needle
thread to be taken care of, otherwise the needle thread will fall and be caught under
the point of the needle.
To obviate this difficulty the needle-thread at a point between the eye of the needle
and the usual tension device, is carried through a yielding or springing arm, the
normal position of which is made variable through the presser-foot and presser-bar
and intermediate devices so that any excess of slack thread is compensated for, as
will be described.
In this invention the take-up lever will be operated positively and uniformly as
to distance notwithstanding variations in the thickness of the material, but the slack
controlling spring arm will, as stated, he moved variably according to the thickness
of the material.
Operating the take-up positively in both directions enables the machine to be run
at a much greater rate of speed and without liability of over-throw than is possible in
a machine when the take-up is operated in but one direction positively, as in Letters
Patent No. 12209 dated October 13th 1885.
I have combined with the presser-bar mechanism for automatically controlling the
slack thread which, as the presser-bar is lifted by variation in thickness of material
under the presser-foot, gives up the requisite amount of thread.
This invention consists essentially in a sewing machine comprehending the following
instrumentalities viz.:-a needle-bar to carry a needle; a rotating needle-bar actuating
shaft provided with quartering cranks; a rotating shaft parallel therewith located
below the bed plate and provided with quartering cranks; an adjustable bearing to
enable the centres of the said shafts to be varied with relation to each other ; two
connecting rods embracing the surface of the said cranks to enable one of the said
shafts to positively rotate the other; a rotating loop-taker; a guide in which the said
loop-taker moves; a short shaft to rotate the loop-taker; and a variable movement
mechanism to rotate the said short shaft from the rotating crank-shaft located below
the bed-plate, the combination being and operating substantially as described.
Also in a sewing machine, the combination of the following instrumentalitics,
viz.: a needle bar to carry a needle; a rotating double cranked needle-bar actuating-
shaft a cam-disc or hub attached to the said shaft; a take-up lever actuated thereby
positively in both directions of its movement; a rotating double cranked shaft located
below the bed-plate and parallel to the needle bar actuating shaft; connecting rods

page_text: to join the cranks of the said shafts a short shaft and a rotating loop-taker actuated
thereby and means substantially as will be described to impart a variable speed to
the said shaft.
Also in a sewing machine the following instrumentalities: viz. a feed-bar; a rock-
shaft to move it forward and backward positively; a rotating shaft having a
triangular cam to move the feed-bar; a rock-shaft having a forked arm provided with
toes to embrace the said cam and also having a segmental arm, the centre of oscillation
of the said rock-shaft and the centre of rotation of the said shaft having the said
triangular cam being so located the one with relation to the other as to enable the
said triangular cam to move the said rock-shaft at a faster speed while the feed-bar is
moving the material forward than when the said feed-bar is on its backward movement,
as will be described.
Also in the combination with a loop-taker-guide, of a series of anti-friction plugs to
support the loop-taker, as will be described.
Also in a sewing machine having a loop-taker guide, and a rotating loop-taker
therein, combined with a segmental cap and with screws and springs located between
the said cap and the inner sides of the heads of the said screws to permit the said cap
to move laterally toward and from the face of the loop-taker guide.
Also in the combination with the needle-bar actuating shaft, its attached grooved
disc or hub, the overhanging arm, and take-up lever, combined with a threaded fulcrum
sleeve having a head, and with a set screw to hold the said fulcrum sleeve in place, as
will be described.
Also in the combination with a sewing machine of the following instrumentalities,
viz. a stitch-forming mechanism; a tension device for the needle-thread; a presser-
foot; a presser-bar; a take-up-lever; means to operate it positively for material of
maximum thickness; a slack thread controlling spring or arm to act upon the slack
thread between the tension device and the material being stitched; and means between
the presser-bar and the said arm to automatically change its position according to
varying thicknesses of material under the presser, the combination being and operating,
substantially as described.
In the accompanying drawings
Figure 1 is a side elevation of a portion of a sewing machine embodying the
present invention the frame-work being broken away to show some of the working
parts.
Figure 1 is a side elevation of the take-up-lever detached.
Figure 1 is a partial section to the right of the dotted lino y Figure 1.
Figure 1 shews the bearing for the shaft C* detached.
Figure 2 is an underside view of Figure 1.
Figure 3 is a partial section of Figure 2 at the left of the dotted line a―x.
Figure 4 is a sectional detail of the tension-device and the devices co-operating
with it to automatically control the slack of the needle-thread.
Figure 5 shows details of the devices between the presser-bar and the tension-device.
Figure 5 is a diagram representing portions of the devices shown in Figure 3, but
in different positions.
Figure 6 is a front or left hand end elevation of Figure 1, the cap for retaining
the loop-taker-guide being broken away to show the plugs therein which serve as
bearings to support the loop-taker, all but a small portion of the loop-taker being
omitted as well as the usual bobbin and bobbin-holder, and most of the saddle c.
Figure 7 is a detail showing part of Figure 6, with the face-plate removed.
Figure 8 is a top view of the front end of the machine to show the face-plate and
parts co-operating with it.
Figure 9 is a section on the line of Figure 2 looking to the left, but with the
machine right side up.
Figure 10 is a detail of the short shaft B6 and saddle C to move the loop-taker.
Figure 11 shows the loop-taker detached.
Figure 12 shows the bobbin for the loop taker, the bobbin-case being broken
away and
B

page_text: i
Figure 13 shows separately the arm or detainer for the bobbin case.
Like letters of reference indicate corresponding parts in all the figures.
The frame-work including the bed-plate A standard A¹, and overhanging arm A
are the same as heretofore constructed.
The overhanging arm has suitable bearings for the rotating needle-bar actuating
shaft B having two cranks 62, 63 set quartering, and preferably forged as integral
parts of the shaft.
The wrists of the two cranks 62, 63, are connected respectively by connecting
rods,, to the wrists of two similar quartering cranks c², e, preferably forged as
integral parts of the shaft C* located below the bed A, and parallel to the needle-
shaft B, by which shaft the shaft C* is rotated continuously in one direction.
As the parts of the connecting rods which embrace the wrists of the cranks referred
to become worn in the use of the machine, the caps 2 co-operating with the said rods
and wrists can be removed and "faced off" thus shortening somewhat the connecting
rods. To compensate for such shortening I have made the bearing (" for the shaft
adjustable, the said shaft being attached to a portion of the bed by two screws, C², C³,
Figure 2.
The shaft C, at its front end is provided with a disc or wheel B³ having a crank-
pin embraced by a link B', the opposite end of which embraces a pin of a crank B³
on a short horizontal shaft B having attached to it a saddle C, Figure 10, the said
disc, link, crank, shaft, and saddle being the same as in the said former specification
No. 12209, the said saddle in operation rotating a loop-taker G, substantially such as
represented in the said former patent but not fully shown, except in Figure 11, the
said loop-taker being arranged to be rotated in a loop-taker-guide D, the loop-taker
entering the loop of thread thrown out from the eye of the eye-pointed needle A³
attached to a needle-bar A4, all as in the said former patent.
This loop-taker-guide is provided with a circular recess the surrounding flange of
which, Figures 1, 2, and 6, has numerous small radial holes which receive in them
antifriction plugs e preferably of raw-hide, the plugs being inserted through the holes
so as to present their ends for contact with the periphery of the loop-taker, the said
plugs being fitted snugly in the holes so as to prevent them from being exposed to
atmospheric changes except at their extremities, the employment of the raw-hide as
small plugs enabling any part of the wearing surface formed by them to be adjusted
or removed readily.
The loop-taker is retained in the open space of the loop-taker-guide by means of a
rigid cap which is secured to the said guide by screws 4, 4, the said screws being
surrounded between the undersides of the heads and the outer face of the rigid cap,
by spiral springs 5 Figure 2, which enable the cap to be moved outwardly bodily
away from the front of the loop-taker-guide should the thread for any reason be
caught within the said guide.
The two screws 4 holding the rigid cap n are located substantially in a horizontal
line drawn through the centre of rotation of the loop-taker thereby leaving the said
cap n, pressed against the loop-taker-guide by a force due to the springs 5 free to
yield or move bodily away from the loop-taker-guide at any part thereof.
I will now describe the mechanism for operating the feed-bar f
The feed-barf is jointed at one end to an arm (see dotted lines Figure 6.) of a
feed driving rock-shaft f² a second arm f³ of the said rock-shaft see Figure 5" having
jointed to it a radius-bar having a stud upon which is mounted loosely a block f
which enters a slot or channel in a segmental portion of a rock-shatt." mounted to
turn in a bearing f of the frame, the said rock-shaft f having a forked arm provided
with two toes 12 see Figure 3, which are extended in the same direction to embrace
a triangular cam 13 on the shaft C*, the said cam moving the said rock-shaft and its
segmental portion positively in both directions, rocking the shaft f² more or less
according to the position of the block f in the groove of the segmental portion
the said block being made adjustable therein toward and from the centre of the rock-.
shaft by means of a stitchi-regulating lever 15 Figure 6, attached to the outer end
of a short rock-shaft 16, Figure 3, having at its inner end an arm f", which by a

page_text: link 18 is connected to the radius-bar fi, the further the block f³ from the centre of
the shaft, the longer the stitch, and vice-versa.
Referring to Figures 3 and 5ª, the numeral 6 represents the actuating point of the
triangular-cam 13, and in Figure 5 where the cam is shown by full lines as just
commencing to effect the forward movement of the feed-bar, and by dotted lines as
just commencing to effect the backward movement thereof, it will be seen owing to
the relative positions of the centres of the shafts C* and 7, that the actuating point 6
of the said cam 15 strikes the portion f10 of the forked arm of the rock-shaft", as the
forward movement of the feed is to take place, closer to the centre of the said shaft f
than when the said point 6 meets the forked arm f12, see dotted lines Figure 5ª to
effect the backward movement of the feed-bar, and as a result thereof the rock-shaft f
is turned about its centro at a groater speed when the material is being fed forward in
stitching.
The upward movement of the feed-bar is effected by an arm g of a feed lifting
rock-shaft gl having an arm g2 forked at its inner end, Figure 9, to embrace a triangular
cam g³ forming part of a disc B³.
The hub of the arm g² is split as shown in Figure 9, and the two parts of the hub
so formed are entered by a clamp screw g which passes freely through the main body
of the hub and screws into the part 9°.
The clamp screw * enables the arm to be adjusted on the shaft g' to vary the point
of ascent and descent of the teeth of the feed bar.
The arm
at its inner end carries a roll go, which as shown in Figures 2 and 6
enters a groove cut into the feed-bar fat its under side, the said roll serving as a
guide for that end of the feed-bar farthest from the operator, and preventing. lateral
movement thereof.
A spring holds the free end of the feed-bar down upon the roller g.
The needle-bar-actuating-shaft B, at its front end, Figure 7 has a disc h provided
with a crank-pin / upon which is placed one end of a link 2, the opposite end of the
link embracing a stud on a block ³ attached to the needle-bar A¹ in usual manner.
The disc at its periphery, Figure 1 is provided with a cam groove m
* which
receives a roller or other stud m¹ attached to the take-up lever m, which is of bell-
crank shape.
This take-up lever is mounted upon a fulcrum sleeve m² having a head, and a hollow
threaded shank, the latter entering a hole in the take-up lever from its inner side
Figures 1 and 7. The end of the said shank abuts against the flat inner end of a
hub m³ located at the inner side of the overhanging arm, where it is held by means of
a set screw m the head of which is exposed at the outer side of the over hanging
arm. Rotation of the said screw enables the end of the shank of the fulcrum-sleevo.
to be drawn firmly against the inner end of the hub m³, and the shank of the fulcrum-
sleeve m² being longer than the take-up-lever is thick, the latter is left free to bo
moved on the said sleeve without binding, yet all lateral play of the take-up-lever is
overcome.
Referring to Figures 1, 6 and 7, the overhanging arm at its front end nearest, the
operator, is bulged outwardly at the front side to form a support for the set screw m*,
and the fulcrum-sleeve of the take-up-lever, so that the periphery of the disc h is
readily made available to actuate the take-up-lever, the said projecting portion also
concealing from the view of the operator the greater portion of the take-up-lever and
also lessening the liability of oil being thrown by the disc in its rotation.
In Figure 1 the bulged portion of the arm has been broken away to show the take-
up within it, and in the said Figure the head of the set screw m* is cut off.
The take-up arm just within the face-plate n is provided with a small disc or pro-
jection m', which at its rear side is concaved or made cup-shape to thus prevent the
outward movement of oil along the take-up arm to soil or come in contact with thread
in the eye 10 of the take-up-lever.
The face-plate p has a slotted projection p¹ which besides covering the end of the
enlarged portion m' of the overhanging arm receives through it the take-up-lever.
The face-plate p of concavo-convex form, Figure 8 embraces the shouldered

page_text: portions m³, mo, of the bearings for the presser and needle-bars to thus prevent lateral
movement of the face-plate.
I have provided the face-plate with an elongated slot n' the longer end of which is
of greater diameter than the head of the set screw n screwed into the hole, no so that
the said face-plate may be readily passed over the said screw in position and then be
pushed downward until the smaller or slotted end of the said opening n embraces
the shank of the screw, and when brought down to the proper position the said set
screw is tightened to confine the face-plate in place.
In this way to remove the face-plate requires the loosening of but a single screw.
The face-plate has a hub n through which is passed a stud 10 Figure 4.
This stud within the hub n³ is surrounded by a spiral spring 3, one end of which
is fixed with relation to the stud, while the opposite or free end of the spring is extended
as at 10, outwardly through a notch in the hub n, the outer end of the said spring
having an eye for the reception of the needle thread between the usual tension pulley n
and the take-up-lever in the normal position of the free end of the spring being
against the shoulder 12 of a backwardly extended flange of a washer 15 shown
separately in Figures 4 and 5, the said washer being loose on the stud 10 at the end of the
hub n. This flange has a second shoulder 16, and is recessed at its periphery, as at 17.
The distance from the shoulder 12 to the shoulder 16 equals the maximum movement to
be given to the free end of the spring n to properly control the slack of the needle thread.
Next outside the loose washer 15 the stud 10 has fast to it a collar 18, which,
co-operating with the end of the hub n serves as a guide for the washer 15 to retain
it in upright position.
-
The outer side of the collar 18 receives against it the usual felt washer and next to
it the tension pulley n acted upon in usual manner by the spring 19 controlled by a
nut 20 on the screw threaded outer end of the stud n
The stud n at its inner end is tapped for the reception of a binding screw n
Figure 4, which by its head retains on the said stud the gear 20 having an arm 16,
the free end of which extended outward through a slot in the face-plate and enters a
notch 17 at the periphery of the washer 15 as shown in detail Figure 5.
>
This gear 20 is engaged by a gear 221 mounted on a screw n secured to the inner
side of the face-plate p.
The gear is notched, as at 25, to receive the pin 26 which serves to attach the
collar 27 to the presser-bar H, so that as the presser bar is lifted by material under
the presser-bar H2, the gears 21 and 2220 are partially rotated to turn the notched
washer about the stud n¹ in the direction to enable it to give up slack thread, the
direction of movement herein given to the said spring being that which coils it farther
upon the stud 210.
.
In this way the thickness of the material is made effective through the presser-foot
and its bar to automatically vary the amount of slack thread given to the needle, the
thicker the material the greater the amount of slack thread given up for the formation
of the stitch and vice versa.
I do not herein claim broadly two rotating shafts, one above and the other below
the bed-plate when the same are connected together by toothed gears, or when con-
nected by links irrespective of the construction of the shafts and links, but in my
invention the shaft under the bed-plate is employed as part of the means for rotating
at a variable speed a shaft parallel with it and actuating a hook or loop-taker.
I have shown the shafts C* and B as connected by a variable motion device such
as is common to the said former patent but instead thereof I desire it to be understood
that I may employ any other equivalent well known devices capable of operating in
like manner.
In Figure 11 I have shown the look-taker separately, and in Figure 12 the
bobbin and its case 61, the said case in practice being restrained from rotation
within the loop-taker by a holding-arm held in place by a suitable latch as t¹ as in
the said patent.
The tension device for the under thread is marked 23.
-
Having now particularly described and ascertained the nature of the said invention,

page_text: 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. The combination in a sewing machine of the following instrumentalities
namely, a bed-plate, a standard and over hanging arm, a needle-bar, a rotary
needle bar actuating shaft journalled in the said arm above the said bed-plate, a
rotating lower shaft C* beneath the said bed-plate and parallel to the said needle
bar actuating shaft, a rotating loop-taker to take the loop or needle thread, a short
rotary shaft 3 to operate the said loop taker, variable motion devices, substantially as
described, between the said shafts C* and B6, a rotary motion transmitting
mechanisin connecting the needle har actuating shaft with the said shaft C* to enable
the former to rotate the latter to operate, substantially as set forth.
Second. The combination in a sewing machine of the following instrumentalities,
viz. a needle-bar, a rotating needle-bar actuating shaft having quartering cranks,
a rotating under shaft C* parallel to the needle-bar actuating shaft and having
quartering cranks, a loop-taker guide, a loop taker therein, a short shaft to operate
the said loop-taker, a variable motion device, substantially as described, between the
said shafts (* and 136, and two links to connect the double cranks of the needle-bar
actuating shaft to the double cranks of the shaft C* to enable one to rotate the other,
substantially as described.
Third. The needle-bar to carry a needle, the rotating double cranked needle-bar
actuating shaft, a cam-disc or hub attached to the said shaft, a take-up actuated
thereby positively in both directions of its movement, the rotating double cranked
shaft below the bed-plate, the connecting-rods to join the said cranks as described,
the short shaft B, and a rotating loop-taker actuated thereby, combined with means
substantially as described, below the shafts C* and B to impart a variable motion to
the shaft B, substantially as described.
Fourth. The feed-bar, the rock-shaft f2 to move it forward and backward
positively, the rotating shaft C*, and its attached triangular cam f¹³, combined
with the rock-shaft having the segmental arm f, and the forked arm provided
with toes to embrace the said cam, the centre of rotation of the said rock-shaft
being located, substantially as described, with relation to the centre of rotation of
the shaft C*, whereby the cam 13 is enabled to move the rock-zhaft at a speed
faster while the feed-bar is moving the material forward than when the said feed-
bar is moving backward under the said material, substantially as described.
Fifth. The loop-taker guide, combined with radial bearing plugs, substantially as
described.
Sixth. The loop-taker-guide, and the rigid segmental cap n combined with the
screws and springs arranged between the said cap and the heads of the screws, to
operate, substantially as described.
Seventh. The shaft B, its attached grooved disc or hub, and the take-up lever and
overhanging arm, combined with a threaded fulcrum-sleeve having a head, and with a
set-screw to hold the said sleeve, substantially as described.
Eighth. In a sewing-machine, a stitch forming mechanism, a tension device ;
presser-foot, presser-bar, take-up-lever, and means to operate it positively and
unerringly for material of maximum thickness, combined with a slack thread con-
trolling spring or arm to control the slack thread between the tension-device and the
material being stitched; and with means between the presser-bar and the said arm to
automatically change its position according to varying thicknesses of material under
the presser-foot, substantially as described.
Dated this 10th day of March 1888.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant: