IMPROVEMENTS IN SEWING .MACHINES
Year: 1874

page_text: LETTERS PATENT to Robert Samuel Daville, of 75, Great George
Street, Liverpool, for the Invention of "IMPROVEMENTS IN SEWING
.MACHINES."-A communication from abroad by George Webster and
John Frazer Webster, both of the City of Hamilton, Ontario, in
the Dominion of Canada.
COMPLETE SPECIFICATION filed by the said Robert Samuel Daville
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 29th July 1874, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
SAMUEL DAVILLE, of 75, Great George Street, Liverpool, send greeting..
WHEREAS I am in possession of an Invention for “IMPROVEMENTS ·
IN SEWING MACHINES," and have petitioned Her most Excellent Majesty
Queen Victoria-to-grant unto me, my executors, administrators, and
assigns, Her Royal Letters Patent for the same, and have made solemn

page_text: Declaration that it has been communicated to me from abroad by
George Webster and John Frazer Webster, both of the City of Hamilton,
Ontario, in the Dominion of Canada.
NOW KNOW YE, that I, the said Robert Samuel Daville, do hereby
declaro that the following is a full, clear, and exact description of the
construction and operation of the same:—
Figure 1 represents a side view of the sewing machine.
Figure 2 a detached view of pulley and crank for driving the shuttle
carrier and shuttle. Figure 3 represents a front view. of the same.
Figure 4 represents a front view of the same below the cloth plate, 1
shewing the shuttle race.
The first improvement relates to a regular even motion needle bar
without stop or rest to needlo bar or shuttle, which causes little noise,
less wear of the parts, and does away with the heart motion, and reduces
the expense of manufacturing, and at the same time makes a lock 1
stitch.
The second improvement relates to the shuttle carrier travelling in a
race composed of two horizontal wires, both of which are adjustable and
arranged and constructed to take up the wear, and raise or lower the
shuttle carrier at pleasure. The ends of the said wires are secured in a 2
perpendicular slot in the bed of the machine, and the said ends of the
wires flattened in their place by means of set screws. As the shuttle
carrier is worn by the constant friction it can be adjusted to the wires by
slacking the said screws and pressing the wires upon it.
The third improvement relates to the shuttle carrier and shuttle being 2
driven by a horizontal pivoted lever provided with a ball-and-socket joint
nt each end; the said lever receives its motion from a crank attached to
a small wheel pulley which is keyed on the end of the lever shaft
immediately underneath the drive wheel.
By reference to the annexed Drawings it will be seen that A represents 3
the cloth plate of the machine; B, the arm of the machino; C, tho
head; D, the main drive wheel; E, the thread; F, a connecting rod;
G, small pulley; H, lower shaft; I, horizontal pivoted lever having a
ball a at each end working in a socket in the shuttlo carrier J and
crank K respectively; L is a circular disc fastened on the shank K for 3
the thread, as will be shown herein-after; M is the pressure post; N is

page_text: the needle bar; O, pressure foot attached to pressure post; P, slots into
which the ends of the shuttle race wires are placed; Q is the feed; R is
the regulator; S, cam operating the feed; T, the thread tension; U, the
movable needle bar arm.
It will be seen that in other sewing machines the needle bar and
needlo have an irregular stop movement produced by the ordinary heart
motion or its equivalent, while this machine is so arranged and con-
structed that the motion of the needle bar and needle is uniform and
regular as well as the shuttle and shuttle carrier, and they both are
timed to work oven and smooth, producing at the same time a perfect
lock stitch.
By reference to Figure 4 it will be seen that the shuttle race is com-
posed of two wires stretching across the machine under the cloth plate
as shewn. They have their extreme ends flattened and are laid in a
corresponding slot P in the part of the machine marked V. Tho shuttle
carrier J is hollowed on the upper and lower side to fit the roundness of
the wires b, b, between which it slides back and forth. The said wires
b are adjusted by means of set screws b³, b², 6", 6", as shown in Figures.
1 and 4.
As the parts wear by the constant friction of the shuttle carrier on
the race the said screws are loosened and the wires adjusted to the
shuttle carrier, thus causing it always to slide smoothly on the race.
By reference to Figures 1 and 2 it will be seen how the shuttle carrier
containing -the shuttle is driven. At the point I' is pivoted a lever
having a lateral movement and provided with a ball at each end to
operate in a corresponding socket. in the shuttle carrier J and pitman K
respectively, the said pitman being connected to a small pulley G which
is keyed on the end of the shaft H, a small disc is secured to the
pulley G, to which is fastened the forked ends c, e, of the pitman K by
the screws This means allows for sufficient play to the pitman
when the machine is in operation.
The thread and take up are arranged as follows:-c is a small pin
fastened to the needle bar and provided with an eye at the outer end;
d is a "take-up" lever arm pivotted to the head of the machine at the
point marked ; its motion is as follows: It is moved upwards by
means of a projection on the movable nccdle bar arin. U striking it.on.

page_text: -
its under side and pushing it upward; i is a small lever at the back of
the head of the machine fastened to the same pin that secures the
take-up arm d; j is a bent wire as shewn in Figure 1 secured to the
needle bar arm through which the said lever i is made to pass, and on
the downward movement of the said needle bar arm U, the lever i, and 5
take-up arm d aro moved downwards,-and-so-on-up-and-down-with-the
movement of the needle bar arm. L is a circular disc fastened with a
shank to the head of the machine. The thread E is made to pass
from the tension T to the eye of the pin c, thence under the shank / of
the disc L, thence upward to the hole m in the outer end of the take-up 1
lever d, thence down over the said shank k and to the eye of the needle..
The disc L is merely for keeping the thread in its proper place on the
shank k.
The action of the lever arms d and i, operated by the needle bar arm
U, &c., as described, takes up the slack of the thread. The needle bar 1
arm U on its downward movement brings down loop j, which strikes
the lever and draws down the take-up arm d, which remains down
until the shuttle has passed through and the needle arm returns to
nearly its full 'licight before taking up the thread, thereby taking the
top and bottom thread up at the same time and completing the stitch at 2
the same moment.
It will bo observed that there are single thread machines which have
a uniform motion of the needle bar, but there is no sewing machine
with a shuttle which has an even motion of the needle bar making a
perfect lock stitch without the aid of a hook below to take up the slack;
of the thread.
To the arm proper B of the machine is pivoted the needlo arm U, an
eccentric is fastened to the end of the lower shaft H having its con-
necting rod (with-a-ball-joint)-secured to the fastening B' of the
needle arm U. The movement of the shaft acts the eccentric, and
through the connecting rod F gives a regular and uniform movement to
the needle bar arm, needle bar, and needle. The shuttle also being
driven by the afore-mentioned crank and pivoted lever I has a smooth
and regular horizontal motion which is timed to act with the needle
bar arm and needle.
-
Having thus described the Invention and disclaiming all other parts,
what is claimed as the Invention consists,―

page_text: 1st. In the needle bar N having an even uniform motion without stop
or rest on its upward or downward movement produced by the driving
shaft H acting upon the eccentric A', connecting rod F, and needle bar
arm U in combination with a uniform motion of the shuttle forming a
perfect double thread lock stitch.
2nd. In the arrangement of an adjustable shuttle raco composed of
round wires b, b, placed in the slots P, P, and adjusted by the set screws
b', b¹, b¹¹, b", substantially as and for the purpose specified.
3rd: In the arrangement of the pivoted lever I provided with a ball-
and-socket joint driving the shuttle carrier J by a crank, as shewn in
Figure 2, or its equivalent, substantially as and for the purpose
specified.
4th. In a positive thread take-up produced by the needle arm U,
arm levers i, d, j, shank and disc L, k, in combination with a regular
or even motion needle bar.
In witness whereof, I, the said Robert Samuel Daville, have
hereunto set my hand and seal, this Twenty-seventh day of
July, in the year of our Lord One thousand eight hundred and
seventy-four.
DADED
TAVIT TH