IMPROVEMENTS IN SEWING MACHINES
Year: 1876

page_text: LETTERS PATENT to. Mark Charles Denue, of Deptford, in the County of Kent,
for the Invention of IMPROVEMENTS IN SEWING MACHINES."
65
PROVISIONAL SPECIFICATION left by the said Mark Charles Denne at the
Office of the Commissioners of Patents on the 18th January 1876.
MARK CHARLES DENNE, of Deptford, in the County of Kent.
IN SEWING MACHINES."
IMPROVEMENTS
This Invention relates to improvements in sewing machines, and consists mainly
in a needle made with the barb reversed so as to push the thread before the barb, so
that the needle in passing through the materials sewn will carry with it the thread
and return without it, leaving the thread to form the loop; the loop is then caught
by a revolving hook and enlarged to allow a shuttle to pass through it. This hook
is bored out in the line of its centres to allow the shuttle to pass in, thereby forming
part of the race. I also place in front of the hook a cradle, which forms the other
part of the shuttle race. I also provide a lifter, looper, or take-up," to take up
the loop of the upper thread after the shuttle has passed through it.
In working the presser foot is lifted by a cam off the work to allow the thread
to be caught by the barb of the needle, and motion is given to a thread carrier by
means of a bell crank actuated by a cam and lever to carry the thread into the
barb of the needle.
The shuttle is worked by means of a rod passing through a hole bored in the
centre of the hook shaft. The rod is actuated by two pins passing through slots in
the shaft of the hook connected with the shuttle carrier.
The machine can be used with ordinary needles by dispensing with the take-up
or looper herein-before referred to.

page_text: This Invention relates to improvements in sewing machines, and consists, firstly,
in a needle made with an opening. in the side near the point, and forming a barb
reversed, so as to be fed with thread and push it through the material being sewn,
the needle returing without the thread, which is lodged over the hook of a
rotating looper to form the loop sufficiently large to allow a shuttle to pass through
it. The body of the looper is bored out in the line of its centre or axis, and serves
as a shuttle race to allow the shuttle to pass to and fro. In front of the hook I fit
a cradle, which forms the other part of the shuttle race. The shuttle is worked by
The
means of a rod passing through a hole bored in the centre of the hook shaft.
rod is actuated by two pins passing through, slots in the shaft of the hook con-
nected with the shuttle carrier. I also provide a lifter or take-up to take up the
loop of the upper thread after the shuttle has passed through it.
In working the presser foot is lifted off the work by a cam to allow the thread
to be caught by the barb of the needle, and motion is given to a thread carrier by
means of a bell crank actuated by a cam and lever to carry the thread into the
barb of the needle.
My Invention is clearly represented in the accompanying Drawings.
Figure 1 is an enlarged view of the point end of my improved needle A, with
the barb or pusher formed with an under cut in its upper face for taking the thread
downward through the fabric, the lower portion of the barb being inclined to enable
the thread to leave it when the needle makes its up stroke.
Figure 2 represents a portion of a sewing machine of my improved make with a
cradle D fixed to the frame, and into which the shuttle enters after passing through
the loop of the thread, which is spread open by the rotation of the hook for the
shuttle to go through.
Figure 3 is a detached view of a shuttle of the form I purpose using in a
machine provided with my improved needle. Motion is given to the needle and its
slide by means of an excentric or cam and lever in the usual manner. The thread
is thrown or placed in the barb. of the needle by a "thrower" previous to its
passing through the material placed on the machine to be sewn. The needle in
continuing its motion carries the thread through the material and far enough for the
rotating hook B to take the loop left by its réturn motion. The loop is then
enlarged by the rotation of the hook or looper, and the shuttle is pushed through
from the bar to the cradle. The machines are timed to pass the shuttle through the
loop by means of a carrier worked by a cam, crank, or other means. Provision is
made to take away the loop after the shuttle has passed through it previous to the
needle commencing to make the next stitch, cither by a looper or take-up worked
by the needle slide or by a separate cam or other means most convenient.
a, a, dotted lines, show the shuttle race in the rotating hook bar and in the
cradle; is a slot in the cradle to guide the shuttle carrier in its to-and-fro travels
in the cradle, this carrier being worked by means of a rod from the outside from a
cam or other appliance. A corresponding motion is given to another carrier fitted
in the hook shaft, which is hollow, for, a rod to be worked from the rear of the
'machine, the shuttle passing from one carrier to the other alternately.
Having now set forth the nature of my Invention, and in what manner the same
is to be performed, I declare that I claim,-
The employment of a needle having a barb formed by an opening in the same
near the point,-as-shown, by which barb I am enabled to pass the thread through
the materials to be sewn in the macliine, and-in-its-return-motion to leave the
thread behind, as described.
Secondly. I claim the construction and employment in sewing machines of a
hollow hook or looper and its bar, the hollow or recessed portion being in a line
with its or their axis, as shown. I use this hollow hook or looper in combination
with a cradle fixed to the frame of the machine and bored to correspond with the
hook, thereby giving room for the free motion backwards and forwards of the

page_text: shuttle in passing through the loop in one direction and returning on the com-
pletion of the stitch.
In witness whereof, I, the said Mark Charles Denne, have hereunto set my.
hand and seal, this Seventeenth day of July, One thousand eight hundred
and seventy-six
M. C. DENNE. (L.S.)