Year: 1888

page_text: Date of Application, 6th Feb., 1888
Complete Specification Left, 6th Dec., 1888
Complete Specification Accepted, 8th Jan., 1889
I, JOHN POYSER of Steeple Grange, Wirksworth, in the County of Derby,
Gentleman, do hereby declare the nature of this Invention to be as follows:-
The object of my present invention is to effect certain improvements in the con-
struction of sewing machines made in accordance with my application for Letters
Patent No. 13350 of 1886.
The result of the said improvements being to simplify and cheapen the construction
of the machine. The said improvements consist mainly of the following features of
construction. I dispense with a take-up arm of any form and employ the well-known
species of rotating hook, which in drawing out the loop tightens the ono previously
forined, a brush being used to hold the loop until it is ready to be drawn up. The
tension device is fixed to the top of the needle bar and moves up and down with it.
the
I prefer to employ a circular post upon which the needle bar bracket slides,
socket.of the said bracket being split and provided with a screw to take up wear.
The presser-foot slides vertically in a tube or carrier affixed to the end of the arm
through which the needle bar slides.
In place of the feed motions previously described, I prefer to provide an eccentric
on the rotating hook shaft working in an arm which carries the feed teeth at the
upper end, the lower end of the said arm carrying a pin which works in a fixed
slot of suitable form to give the required action. The teeth are preferably, not rigidly
attached to the arm but are so pivotted thereto that the length of stitch can be
regulated by a suitable adjusting stop.
In place of the form of multiplying gear heretofore described, I mount a spur
wheel and pinion in a casing attached to the back of the machine, the wheel is rotated
by a handle on the end of its shaft and a small fork or clutch on the pinion embraces
the end of the needle crank pin on the dise on the rotating hook shaft; or I mount a
pinion on the said crank pin and drive it by means of an internally geared wheel
journalled on a stud on the back of the machine, and in this case the handle projects
directly from the back of the said wheel.

page_text: When internal gearing is employed, I may dispense with the teeth and employ
frictional contact surfaces only, Indian rubber or other suitable elastic material being
affixed to one or both of the said surfaces.
T
1م
"
11 1 "
1000
AMBROSE MYALL,
2.1, Cockspur Street, London,
Agent for the Applicant.
Improvements in Sewing Machines.
I, JOHN POYSER, of Steeple Grange, Wirksworth, in the County of Derby,
Gentleman, 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:-
The object of my present invention is to effect certain improvements in the
construction of portable or pocket sewing machines, made in accordance with my
Letters Patent No. 13350 of 1886. The result of the said improvements being to
simplify and cheapen the construction of the machines.
The said improvements consist mainly of the following features of construction. I
dispense with a take-up arm of any form and employ the well-known species of
rotating lock-stitch hook, which in drawing out each loop, tightens the one previously
formed, a brush being used to hold the loop until it is ready to be drawn up.
The tension device is fixed to the top of the needle-bar, and moves up and down
with it.
I prefer to employ a circular post upon which the needle-bar bracket slides, the
socket of the said bracket being split, and provided with a screw or screws to take
up wear.
The presser-foot slides vertically in a tube or carrier affixed to the end of the arm
through which the needle-bar slides.
In place of the feed motions previously described in my aforesaid Letters Patent,
1 prefer to provide an eccentric on the rotating hook shaft working in an arm, which
carries the feed teeth at the upper end, the lower end of the said arm being provided
with a pin, which works in a fixed slot of suitable form to give the required action.
The teeth are not rigidly attached to the arm, but are so connected thereto that the
length of stitch can be regulated by a suitable adjusting stop.
In place of the form of multiplying gear heretofore described, I mount a spur
wheel and pinion in a casing attached to the back of the machine, the wheel is rotated

page_text: by a handle on the end of its shaft and a small fork or clutch on the pinion embraces
the end of the needle crank-pin on the disc on the rotating hook shaft; or I mount
a pinion on the said crank pin, or on a separate stud, and drive it by means of an
internally geared wheel journalled on a stud on the back of the machine, and in this
case the handle projects directly from the back of the said wheel.
When internal gearing is employed, I may dispenso with the teeth and employ
frictional contact surfaces only. Indian rubber or other suitable material being affixed
to one or both of the said surfaces.
In the accompanying two sheets of drawings, Fig. 1 is a side elevation, partly in
section, and Fig. 2 is a back elevation, with the driving gear removed, of a sewing
machine constructed according to my invention, with internal driving gear; Fig. 3 is
an elevation of the driving gear detached; Fig. 4 is a front elevation, and Fig. 5 is a
part plan of the feeding mechanism; Fig. 6 is a part side elevation of a similar
machino fitted with external or spur driving gear, and Fig. 7 is an elevation of the
said gear; Figs. 8, 9 and 10 are respectively side and front elevations and part plan
of a modification of the feeding mechanism shown in Figs. 1, 4, and 5.
Similar letters of reference denote similar parts throughout the drawings.
A is the frame of the machine provided with a screw clamp B for attachment to the
edge of a table or other support, C is the work table, D is a circular post upon
which the bracket E slides, H is an arm or bracket secured on the top of the
post D by the nut D, F is the needle-bar fixed in tifo bracket E and sliding through
the bracket H. The bracket E is split at the back, as shewn clearly in Fig. 2 and
provided with screws E¹ E¹, to take up wear. The said screws also serve to attach
the cain-plate O to the bracket E. This can-plate is driven by a crank-pin P on the
disc N, which is affixed to the end of the shaft I... The presser V slides vertically in
a tube affixed to or formed in one piece with the bracket H; it is pushed down
by a spring V acting on a pin v working in a slot w in the tube V₁, and is held up
when required by the catch V³.
Attached to the outer end of the shaft L is a rotating lock-stitch hook M, of the
well-known form, which in drawing out each loop of the upper thread pulls in and
tightens the loop previously formed, such latter loop being temporarily held by a
bush M until ready to be drawn up. M' is the shuttle for the under thread and
Qthe shuttle guard. By employing the said hook and brush, in combination with my
machine, I am enabled to dispense with a take-up arm of any form.
X is a tension device of any suitable construction, for the top thread, fixed upon the
needle bar F and the reel is placed on the end of the post D.
In the feed-motion shewn in Figs. 1, 4, and 5, a is an eccentric, formed in one piece
with, or affixed upon the shaft L, and working in an arm b; a pin c is fixed in the
lower end of this arm and travels in a slot d, thereby causing the upper end of the
arın to travel in the proper path for operating the feed teeth e. These teeth form
part of a piece, which is free to slide vertically in a piece y, and this piece y again is
9.
free to slide horizontally on a piece h fixed under the table (. The sliding pieces are
dovetailed in cross-section, similarly to the slide-rest of a lathe. A slot is formed in
the piece, and a pin in the upper end of the arm bengages with this slot and so
operates the foed teeth; a spring k, fixed at one end of the arm b, and pressing at the
other end against a pin inf, keeps the pin jin the end of the slot i, as shewn in
Fig. 4, but when the adjustable stop U is advanced inwards, the teeth cannot make the
full return stroke, and the pinj travels slightly in the sloti, thus shortening the length
of stitch. This feed motion combines the noiseless action of an eccentric with perfect
parallelisin of the teeth with the work, at all times.
In the modified feed motion shewn in Figs. 8, 9 and 10 the eccentric a, arm b, pinc,
slot d, and pinj are the same as before, but the teeth e form part of a plate, which
has two studs n n, pivotted in sockets oo on the table C. These studs are also capable
of a short sliding motion in the said sockets, thus providing for the vertical and
horizontal motion of the feed teeth. The pin engages in a slot i in a downwardly
projecting piece on the plate m, and the action of the spring &, pin and stop U is the
same as in the other arrangement.

page_text: The teeth e move vertically in the arc of a circle instead of a straight line, but the
curve is so slight as to be of no practical importance.
Although these feed motions are described in relation to a rotary lock-stitch machine,
it is obvious that they are applicable to any ordinary chain-stitch or other sewing
machine provided with a rotating shaft under the work table.
In the driving gear shewn in Figs. 1, 2, and 3, 2 is a bracket affixed by
screws 3, 3, to the back of the frame A, 4 is an internally toothed wheel, journalled
on a stud 5 on the outside of the bracket and gearing with a pinion 6 journalled on a
stud 7 on the inside of the bracket. Affixed to the pinion is a disc or arm 8,
having a notch 9 cut in its edge to engage with the projecting end of the pin P.
The wheel is driven by a handle 10, which is hinged at 11, so that it can be
folded down when not in use. A sliding sleeve 12 is provided to keep the handle
in the position shewn in Figs. 1 and 3.
In the driving gear shown in Figs. 6 and 7, a frame 13 is affixed by screws to
the back of the machine, the handle 10 drives a spur wheel 14, which gears with a
pinion 15. This pinion is fitted with a disc or arm 8, engaging with the pin P
as before. The wheels 14 and 15 are fixed on spindles 16 and 17, journalled in bosses
in the frame 13. The projecting end of the spindle 17 is of such size, that the
shuttle M can be placed upon it for winding.
In hoth forms of the driving gear, the handles, for gronter convenience, preferably
move the same way, as indicated by the arrows in Figs. 3 and 7 and one form of
gear being internal and the other external, the hook M revolves in the first case
the same way as the handle and in the second case the contrary way, so that the
hooks have to be shaped right and left-handed accordingly.
The machines are shewn speeded to give three stitches to each revolution of the
handle, which is a convenient arrangement in practice, but I do not confino
myself to any particular proportion in this respect.
The cam slot in the plate O is curved slightly downwards on one side, as shown
in Fig. 2, in order to give a quick withdrawal of the needle after the hook M
has seized the loop, and this slot is made right or left-handed in accordance with
the direction of rotation of the hook M.
The table is hinged in the centre, so that it can be turned up out of the way
when not in use, as shown by the dotted lines in Fig. 1.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a portable or pocket rotary lockstitch sewing machine, a needle bar F, tension
device X, arm E and cam-plate O, forming one piece, sliding upon a post D and
operated by a crank-pin P on a shaft L, in combination with the rotary lock-stitch
hook M on the said shaft, shuttle M³, brush M², and guard Q, substantially as
described.
2. In a portable or pocket rotary lock-stitch sewing machine, a needle-bar bracket E,
sliding on a circular post D and split and provided with screws E¹ to take up wear,
substantially as described.
3. In a rotary lock or chain-stitch sewing machine, a feed motion operated by an
eccentric and constructed substantially as herein shewn and described, with reference
to Figs. 1, 4, and 5 of the accompanying drawings.
4. In a rotary lock or chain-stitch sewing machine, a feed motion operated by an
eccentric and constructed substantially as herein shewn and described, with reference
to Figs. 8, 9, and 10 of the accompanying drawings.
5. In a portable or pocket rotary sewing machine, the driving gear consisting of a
handle 10, internally toothed wheel 4, pinion 6 and disc 8, carried on studs on a
bracket 2, substantially as herein shewn and described with reference to Figs. 1 and 3
of the accompanying drawings.
6. In a portable or pocket rotary sewing machine, the driving gear, consisting of
a handle 10, spur wheel 14, pinion 15 and disc 8, journalled in a frame 13, substantially

page_text: as herein described and shown with reference to Figs. 6 and 7 of the accompanying
drawings.
7. A portable or pocket rotary lock-stitch sewing machine, constructed substantially
as herein described and shewn with reference to Figs. 1, 2, 3, 4 and 5 of the
accompanying drawings.
8. A portable or pocket rotary lock-stitch sewing machine, constructed substantially
as herein described and shewn with reference to Figs. 6, 7, 8, 9 and 10 of the
accompanying drawings.