Year: 1893

page_text: Date of Application, 20th Mar., 1893
Complete Specification Left, 20th Dec., 1893-Accepted, 3rd Mar., 1894
GEORGE BENSON 48 & 50 Fountain Street Belfast, Machine Maker, do hereby
declare the nature of this invention to be as follows:
This invention consists in improved mechanical arrangements for producing both
plain and fancy stitches.
These arrangements are mainly as follows:-
The frame for carrying the various parts is designed on the same lines as those
used for machines on the Thomas principle.
The main driving shaft is placed in the same way as in Thomas machines and
gives the motion to the various parts, but the cams at present used in front of the
frame for moving the needle and shuttle are dispensed with.
In place of the needle cam an eccentric motion running on the shaft is used
carrying an eccentric rod provided with means for taking up wear.
This eccentric rod is attached to the horizontal lever known as the needle lever.
the needle lever being pivoted off the centre and joined to the needle bar by a slot
in its other extremity.
In this slot the needle bar works by means of a swivel, and the needle lever thus
gives the needle bar its necessary motion.
In place of the straight shuttle, shuttle box, and shuttle cam, a circular hook or
shuttle is used; either working in a hook or shuttle race, or independently on its
own axis. The motion to this is given by a crank in the main shaft behind the
frame.
On this crank works a horizontal connecting rod provided with means for taking
up wear.
This rod is slotted in its centre and works ou a swivel carried by a column on
sole plate of frame. The other extremity of this rod is connected to a slotted
disc by a stud or slide.
This disc is attached by a set screw to a revolving shaft carrying at its other
end a driver for giving motion to the hook or shuttle. The circular hook or shuttle
is thus revolved from right to left and in the same line as previously taken by the
straight shuttle.
In place of a quadrant or thread lifter for taking up the slack thread, a take up
ever is employed actuated by a grooved cam inside the balance wheel on shaft in
ront of frame.
COMPLETE SPECIFICATION.
Improvement in Sewing Machines.
GEORGE BENSON 48 & 50 Fountain Street Belfast Machine Maker do hereby
declare the nature of this invention and in what mauner the same is to be
o performed, to be particularly described and ascertained in and by the following
statement:-
This invention consists of improved mechanical arrangements for producing both
GEORGE BENSON 48 & 50 Fountain Street Belfast Machine Maker do hereby
declare the nature of this invention and in what manner the same is to be
o performed, to be particularly described and ascertained in and by the following
statement :-
This invention consists of improved mechanical arrangements for producing both

page_text: :-
These arrangements are mainly as follows:-
The frame for carrying the various parts is designed on the same lines as those
used for machines on the Thomas principle.
The main driving shaft is placed in the same way as in Thomas machines and
gives the motion to the various parts-but the cams in front of the frame at
present used for moving the needle and shuttle are dispensed with. In place of the
needle cam an eccentric motion running on the shaft is used carrying an eccentric
rod provided with means for taking op wear. This eccentric rod is attached to the
horizontal lever known as the needle lever, the needle lever being pivoted on its
centre and joined to the needle bar by a slot in its other extremity in the usual
way adopted on Thomins machines. The needle lever, needle bar, and foot, all
remain unchanged, being similar to those now used in machines on the Thomas
principle.
The feed motion is made by a leg or mover, and claw. The leg or mover in
fitted into a slot in the head of the machine and is held in its place by a pin in
top, and a back spring at bottom. Movement is given to it by a rocking lever
having an arm at each end. One arm is placed behind the leg or mover and the
other arm is carried down to and actuated by a face cam, commonly called the
moving Cat. The motion thus given to the mover is forwards and backwards
carrying the fabric to be sewn with it. To give intermittent pressure to the mover
a swinging lever is used, one end pressing on the top of the mover, the other and
wking of a eam, commonly called the lifting cain, the required pressure being
given by a coil spring or elastic.
In place of a straight shuttle, shuttle box, and shuttle cam, a circular hook or
shuttle is employed. The motion to this is given by a crank in the main shaft
behind the frame. This crank works a horizontal connecting rod provided with
means for taking up wear. This rod is slatted in its centre and works on a swivel
carried by a column on the sole plate of the frame, its other extremity being
connected to a slotted dise by a stud or slide. This disc is attached by a set screw
to a revolving shaft carrying at its other end a driver for giving notion to the
hook or shuttle. The circular book or shuttle is thus revolved from right to left
and in the same line, as was ordinarily taken by the straight shuttle.
In place of a quadrant or thread lifter for taking up the slack thread, a take up
lever is employed actuated by a grooved cam inside the balance wheel on the shaft
in front of the frame.
In order that my invention may be properly understood I have hereunto appended
three explanatory sheets of drawings, whereon
Fig. 1 represents a front view of the frame, eccentric, eccentric rod, needle lever,
take up lever, and hook or shuttle race. A is the frame, B the eccentric, C the
ercentric rod, D the needle lever, E the take up lever, F the circular hook or
shuttle race, and G is a catch for holding the bobbin case in its place.
Fig. 2. is an outline of the frame from a back view showing the crank on the
shaft, the horizontal lever, the pillar supporting its centre, and the slotted disc.
A is the frame, J the crank in shaft, the horizontal lever, L the pillar and
M the slotted disc.
Fig. 3. shows an end view of the slotted disc, hook, shaft and driver, M is the
slotted disc, N the hook shaft, and ( the driver.
Fig. 4. shows the feed motion. N is the mover or leg. N1 the claw and
O the back spring, P is the coil spring R the rocking lever. R1 the arm at
back of leg R2 the arm on cam. S is the lifting lever, T the moving cam and
T1 the lifting cam.
Fig. 5. is an end elevation of the above motion.
In operation the needle lever D is actuated by the eccentric rod ( working
on the eccentric B and gives the necessary vertical motion to the needle. The
mover N. and claw N1 holds the fabric tightly on the needle plate by means
of the coil spring P, while the arm R1 moved by the rocking lever R. and the
arm R 2 which arm is actuated by the moving cam T pushes forward the claw N 1.

page_text: The lifting lever S. actuated by the lifting cam T1 lifts the claw off the fabric
while the needle is in the fabric, and the back spring O pushes the claw NI
into position for the next stitch. The circular hook or shuttle is worked off the
crank J in the shaft by means of the horizontal lever K, the slotted disc M, the
hook shaft N and driver O.
The adjustment of the time for the entrance of the hook into the loop formed
by the needle is obtained by the position of the slotted disc M on the hook shaft.
When the machine is inade without any side motion in the needle bar, but
only a forward and backward motion of the leg or mover, and claw, it is evident
that a plain stitch will be produced, but by varying the forward and backward
motion with the side movement of the needle bar slide, at right angles to the
claw in the proportion of 2 to 1, 3 to 1, 4 to 1 and so on, fancy stitches such
as hemstitch, revere, herringbone, buttonhole, and other stitches can be made.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, 1 declare that what
I claim ;-
The combination in sewing machines of what is generally known as the Thomas
feed and system, substantially as hereinbefore described with a rotary hook or
shuttle.
DL: 101 J
D
1
1000
GEO. BENSON.