Year: 1887

page_text: We, FRANCIS SIDNEY SHARPE of Blomfield House London Wall in the City of
London Engineer and THE MOLDACOT (COLONIAL & FOREIGN) POCKET SEWING
MACHINE COMPANY Limited also of Blomfield House London Wall in the City of
London do hereby declare the nature of this invention to be as follows:-
:-
This invention relates to lock stitch sewing machines of cheap construction, which
are portable and readily attachable by clamps to a table, and relates more particularly
to the construction and method of operating the reciprocating needle bar, the shuttle
and the feed.
The frame of the machine is in the shape of a Ġ having the presser foot and needle
slide mounted on the end of the goose neck, and having the shuttle arm reciprocating
longitudinally below the cloth plate which is supported on the lower arm and the back
of the framework.
The needle slide bar is linked to one arm of a lever pivotted on the goose neck the
other arm being linked to a vertical slide which is caused to reciprocate by a pin on it
travelling in a cam path formed in the face of the driving wheel.
On the face of the lower arm of the framework is pivotted another lever to one
arm of which motion is given by connecting it to the crank pin of the driving
handle or vertical slide above mentioned. At the end of the other arm of this lever
is a pin engaging in a cam slot of a rocking segment which carries the shuttle
causing it to reciprocate along the inner face of a plate which projects down from
the cloth plate and has a slot in which the needle reciprocates up and down.
The material is fed by the usual serrated plate working in a slot of the cloth
plate under the presser foot. Motion is given to this feed plate by a projecting
part of the lower rocking lever which presses it upwards and forwards and then
releases it allowing it to be returned by a spring. The amount of travel of this
serrated plate can be regulated by an adjustable stop.
The machine is provided with the usual guides, tension and take up arrangements
for the threads, and the frame has a foot by which it can be readily clamped to a table.
Dated this 19th day of December 1887.
ABEL & IMRAY,
Agents for the Applicants.

page_text: •
Improvements in Sewing Machines.
We, FRANCIS SIDNEY SHARPE of Blomfield House, London Wall in the City of
London, Engineer and THE MOLDACOT (COLONIAL & FOREIGN) POCKET SEWING
MACHINE COMPANY Limited also of Blomfield House, London Wall in the City of
London 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 :-
This invention relates to lock stitch sewing machines of cheap construction, which
are portable and readily attachable by clamps to a table, and relates more particularly
to the construction and method of operating the reciprocating needle bar, the shuttle
and the feed, as I will describe referring to the accompanying drawings. Figs. 1
and 2 are elevations of the two opposite sides of a sewing machine according to this
invention Fig. 3 is a front end view; Fig. 4 is a plan; Fig. 5 is an elevation of the
cam for working the needle arm; Fig. 6 is a part side view shewing a modified
arrangement for working the needle and feed; Fig. 7 is a front view of the eccentric
and slide shewn in Fig. 6; and Fig. 8 is a front view of the feed gear as shewn
in Fig. 6.
The framework A of the machine is in the shape of a G, having the presser foot B
and needle slide C mounted on the end of the goose neck, and having the shuttle
arm D reciprocating longitudinally below the cloth plate E which is supported on the
lever arm and the back of the framework.
The needle slide bar C is linked to one arm of a lever F pivotted on the goose neck
the other arm being linked to a vertical slide G which is caused to reciprocate by a
pin on travelling in a cam path, as shewn in Fig. 5, formed on the face of the
driving wheel H. Or, according to the modification shewn by Figs. 6 and 7, the
vertical slide G is made with flanges embracing an eccentric on the driving wheel H.
The front end of the lever F is made with a telescopic sliding joint at Y to allow for
the needle slide moving in a straight line while the lever oscillates in a circular arc.
On the face of the lower arm of the framework is pivotted another lever K to one
arm of which motion is given by connecting it to the crank pin L of the driving
handle, as shewn in Figs. 1 and 2, or to the vertical slide G as shewn in Figs. 6 and 7.
At the end of the other arm of the lever K is a pin engaging in a cain slot M of the
rocking segment arm D which forms the carrier of the shuttle N, causing it to
reciprocato along the inner face of a plate O which projects down from the cloth
plate E and has a slot in which the needle reciprocates up and down.
The material is fed by the usual serrated plate P working in a slot of the cloth
plate under the presser foot. Motion is given to this feed plate P, as shown in Figs. 2
and 3, by a projecting part of the lower rocking lever K which, as it ascends, bears
against a curved part p of a guide arm attached to the feed plate P, and presses P
upwards and forwards, and then releases it allowing it to be returned by a spring pl.
The amount of travel of this serrated plate can be regulated by an adjustable sliding
stop that can be advanced or retracted by advancing or retracting a sliding bar R

page_text: which has an inclined slot engaging a stud on Q, and which can be set where
desired by a setting screw r. As shewn in Figs. 6 and 8, the lever K is linked to a
lever S on which there is a cam projection & which acts on a small roller p mounted
on the feed slide P, causing it to rise and advance at each upstroke of k.
The machine is provided with the usual guides, tension and take up arrangements
for the threads, and the frame has a foot T by which it can be readily clamped to
a table.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
1. In a lockstitch sewing machine, for driving the needle and shuttle, the com-
bination of the driving wheel H having a cam path the vertical slide G linked to the
needle lever F, and the crank L linked to the shuttle lover K substantially as
described.
2. The modified arrangement or combination of the driving wheel H having an
eccentric and the vertical slide G linked to the needle lever F, and to the shuttle
lever K substantially as described with reference to Figs. 6 and 7.
3. For working and adjusting the feed the combination of the projection K on the
shuttle lever K with the curved arm p and spring p' of the feed slide P, the adjustable
stop and adjusting bar R. substantially as described with reference to Figs. 1, 2, 3
and 4.
4. The modified arrangement for working the feed, or combination of the lever S
linked to the shuttle lever K, the cam projection k and the roller p on the feed slide P,
substantially as described with reference to Figs. 6 and 8.
5. The construction and use of a lockstitch sewing machine, substantially as
described with reference to Figs. 1, 2, 3, 4 and 5, or with certain of its parts modified
substantially as described with reference to Figs. 6, 7 and 8.
Dotad this 2ml dow of Tulu 1000
ABEL & IMRAY,
Agents for the Applicants.