IMPROVE- MENTS IN SEWING MACHINES
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by the said Adolphe François at the
Office of the Commissioners of Patents on the 16th August 1881.
ADOLPHE FRANÇOIS, resident at Douai, in the Republic of France. "IMPROVE-
MENTS IN SEWING MACHINES."
The object of the present Invention is an improvement in sewing machines,
whereby with the same number of revolutions of the main shaft (which is either
driven direct by hand or by means of a strap or cord from a treadlo), twice
as many stitches can be made as is possible with machines heretofore known.
For this purpose a shuttle with two points and one spool similar to the shuttle
of a weaving loom is employed, and the needle is caused to make twice as many
strokes as usual.
On the main shaft are fixed two discs or drums furnished on their circumference
with peculiarly formed grooves; the larger of these discs or drums serves to move
the needle, and the smaller one to move the shuttle. The groove of the larger disc
or drum is so formed that the pin running in it (which is fixed to a bent lever)
comes twice into the same position with relation to any fixed part of the machine
for each revolution of the shaft; that is to say, that the bent lever, which is
Oscillated by the movement of the larger disc or drum, moves the needle up and
down twice whilst the shaft makes one revolution only.
The smaller disc or drum, which moves a horizontally oscillating lever which
acts upon the shuttle, is furnished with a groove by which a to and fro movement
of the shuttle is produced when the said disc or drum and its shaft make a
revolution.
By those novel arrangements the shuttle is caused to pass through the loop
formed by the needle thread at both its forward and its backward movements, and
for that reason the needle is caused to mako two up and down movements, whilst
the shuttle makes only one to and fro movement.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Adolphe François in the Great Seal Patent Office on the
16th February 1882.
ADOLPHE FRANCOIS, resident at Douai, in the Republic of France.
MENTS IN SEWING MACHINES."
" IMPROVE-
The object of the present Invention is an improvement in sewing machines,
whereby with the same number of revolutions of the main shaft (which is either
driven direct by hand, or by hand or by means of a strap or cord from a treadle),
twice as many stitches can be made as is possible with machines heretofore
known.
For this purpose a shuttle with two points and one spool similar to the shuttle
of a weaving loom is employed, and the needle is caused to make twice as many
strokes as usual.
In the Drawings hereto annexed, Fig. 1 is an elevation partly in section on
line Z, Z, of Fig. 2, of a sewing machine with these improvements applied thereto;
Fig. 2 is a view from below; and Fig. 3, a plan of the shuttle guide with the
shuttle.
On the mainshaft a are fixed two discs or drums 6 & c, furnished on their
circumferences with peculiarly formed grooves, the larger 6 of these discs or drums
serves to move the needle n, and the smaller one c to move the shuttle s.
The grooves of the larger discs or drum b is so formed that the pin running in
it (which is fixed to a bent lever d) comes twice into the same position with
relation to any fixed part of the machine for each revolution of the shaft, that is
to say, that the bent lever d, which is oscillated by the movement of the larger
disc or drum b moves the needle up and down twice, whilst the shaft a makes
one revolution only.
The smaller disc or drum c, which moves a horizontally oscillating lever e, which
acts upon the shuttle, is furnished with a groove by which a to and fro movement
of the shuttle is produced when the said disc or drum c and its shaft a makes a
revolution.
By these novel arrangements the shuttle is caused to pass through the loop
formed by the needle thread at both its forward and its backward movements,
and for that reason the needle is caused to make two up and down movements,
whilst the shuttle makes only one to and fro movement.
Having now described the nature of the said Invention, and the manner in
which the same is to or may be carried into effect, I would have it understood
that what I claim is,―
First. The employment in sewing machines of a shuttle provided with two
points and one spool, which shuttle is caused to pass through the loop formed by
the upper thread both at its forward and at its backward movements, as herein-
before described and illustrated in the Drawings.
Second. The arrangement of the disc b furnished with a peculiarly formed
groove, by means of which the needle rises and descends twice whilst the shaft

page_text: makes one revolution and the shuttle one to and fro movement, as hereinbefore
described and illustrated in the Drawings hereto annexed.
In witness whereof, I, the said Adolphe Francois, have hereunto set my
hand and seal, this Fourteenth day of February, in the year of our Lord
One thousand eight hundred and eighty two.
Witness,
ADOLPHE FRANCOIS. (L.S.)
LORENTZ ALBERT GROTH, K.G.V.,
Proprietor of the Scandinavian Patent Office,
97, Finsbury Pavement,
London.