Improvements in Hemstitch Sewing Machines.
Year: 1892

page_text: Date of Application, 22nd Oct., 1892
Complete Specification Left, 21st July, 1893-Accepted, 9th Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Hemstitch Sewing Machines.
JAMES CRONNE 24 Donegall Pass Belfast Ireland Handkerchief Manufacturer,
do hereby declare the nature of this invention to be as follows:-
This invention is an. arrangement adapted to sewing machines, for the purpose of
producing an open-work stitch in fabrics, by means of two movable needles, working
in conjunction with two shuttles, having a sliding-gear motion on a revolving shaft.
The corresponding movements of the needles and shuttles being worked by a
vibrating lever and cam.
"
The carriers of the one needle and its corresponding shuttle are attached to the
one end of the lever, and those of the other needle and shuttle to the other end.
The lever being slotted at each end, enables the needles to be brought nearer
together, or further apart, as may be required.
Dated this 21st day of October 1892
Improvements in Hemstitch Sewing Machines.
1, JAMES CRONNE, of 24 Donegall Pass, Belfast, 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 an arrangement adaptable to sewing machines for the
purpose of producing an open-work stitch in fabrics, by means of two movable
needles, working in conjunction with two shuttles having a sliding gear motion on a
revolving shaft. The corresponding movements of the needles and shuttles being
worked by a vibratory lever, and cam. The carriers of the one needle and its
corresponding shuttle are attached to the one end of the lever and those of the
other needle and shuttle to the other end.
The lever being slotted at each end enables the needles to be brought nearer
together or farther apart as may be required.
And in order that my said invention may be properly understood I have hereunto
appended an explanatory sheet of drawings, whereon
Fig. 1 is a side view of a sewing machine, showing my improvements.
Fig. 2 is another view of the same machine but turned round.
Fig. 3 is a plan view of a part of the mechanism.
Fig. 4 is a plan of the head of the machine.
Fig. 5 is a detail view to an enlarged scale.
Referring to the drawings whereon the same reference letters wherever repeated
indicate similar or like parts.
a, a', are rotary shuttle boxes, which have bevel wheels b, b', at their under sides.
These wheels b, b¹, mesh with bevel wheels c, c', fitted to or made one with
collars d, d', which are capable of being slid backwards and forwards on the hori-
zontal driving shaft e The driving shaft e, which is carried in bearings f, is
revolved by the driving wheel y (Fig. 1). The sliding collars d, d', are moved
backwards and forwards on the shaft e by means of forks or jaws h, h¹, which catch
in grooves i, 2, in the collars. The collars are keyed to the shaft by the key or

page_text: feather. The forks h, h¹, are fitted to or made one with the plates k, k¹, which
support the shuttle boxes a, a³. These plates have slotted extensions, 1. One
end of a bent carrier har m is pinned to the slotted extension 1, the pin passing
through the slot, and being adjustable therein, whilst its other end is pinned to the
lower part of a plate n. Likewise one end of the carrier bar m¹ is pinned to the
slotted extension P. and its other end to the upper part of the plate .
The plate n
which is pivotted at n' to the arm o of the machine, is capable of being vibrated
backwards and forwards by the action of an internal cam wheel p (see also Fig. 5)
into the groove pl of which a stud q, on the plate n, works. 7', , are two carriers
for moving, horizontally, the needle bars s, s¹. These carriers are pinned,
respectively, at t, t¹, to lugs on the needle bar holders u, u', and, at v, v¹, to the
plate n. The pin serves to secure, as will be seen, both carriers m and r and the
pin both carriers m and . The plate n is slotted as shown for the purpose of
allowing the pins v, v¹, and carriers to be adjusted in order to regulate the distance
apart of the needles and shuttles.
Vertical movement is given to the needle bars s, s¹, by means of an internal
cam w on the driving shaft e, which, as it revolves, reciprocates in a vertical path
the stud and rod x. The rod, which is, at its upper end, pinned to the lever y,
which latter is fulcrumed at y' to the arm o, communicates its motion to said lever
and reciprocates it. The lever y is connected, at y², to a short link y3 which is
pinned to a slotted frame carrying the needle bars s, s¹ (see also Fig. 4). The
needle bars move along with the frame and up and down through the needle bar
holders.
The holders are capable of sliding, horizontally, on the guides z¹, z², in the
head o¹ and the shuttle boxes on the guides a³, at, (see Fig. 3).
The cam wheel p, has teeth cut in its circumference which gear with a pinion e¹.
This pinion is fitted on and driven by the cross shaft e² which is rotated by
gearing from the main shaft c.
wol is a cam for taking up slack thread.
The operation of the apparatus is as follows
:-
When the shaft e is revolved the collars d, d¹, are also revolved and the shuttle's
are rotated, at the same time the cam w actuates the lever y, and needle bars s, s¹,
in which the needles are fitted, so as to perform the operation of stitching. As the
shaft e revolves it rotates the pinion e and moves at a slower rate the cam wheel p,
so vibrating or swinging the plate n, and, from the method of connecting the
carriers m, m³, r, r¹, to said plate, alternately drawing the shuttles and needle bars
together and thrusting them apart. The movements of the needle bars and shuttles
are synchronous, as the pins », vl, serve to connect each set of carriers.
By this construction of machine open work stitching is produced.
If desired parts of the machine may be modified without departing from the
principle of the invention.
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. A hemstitch sewing machine constructed and operating substantially as herein-
before described and shown on the drawings annexed.
2. A sewing machine having two needles and two shuttles which are moved
laterally backwards and forwards so as to change their relative distances apart and
thereby produce open work stitching, substantially as hereinbefore described with
reference to the drawings annexed.
3. The combination with the shuttle boxes a, a¹, of the gearing b, b, and sliding
collars d, d, carried on the driving shaft, substantially as hereinbefore set forth.":
4. The combination with the laterally movable shuttle boxes a, a', of the
connecting carrier bars m, m', and vibratory plate n, substantially as hereinbefore
set forth.

page_text: 5. The combination with the laterally movable needle bars, s', of the con-
necting "carrier bars" ", ", and vibratory plate n, substantially as hereinbefore
set forth.
·Dated this 19th day of Jule 1802
•
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.