Improvement in Sewing Machines.
Year: 1892

page_text: Date of Application, 23rd Apr., 1892
Complete Specification Left, 21st Sept., 1892-Accepted, 22nd Oct., 1892
PROVISIONAL SPECIFICATION.
Improvement in Sewing Machines.
I GEORGE BENSON 48 & 50 Fountain Street Belfast Manufacturer do hereby
declare the nature of this invention to be as follows:-
This invention, which relates to improvements in hem-stitching and other sewing
machines has for its object to obtain a reverse or backward stitch in addition to
the ordinary stitch on one and the same sewing machine This is obtained by the
use of a supplementary or intermediate lever acting on the ordinary slotted lever
which through the bell crank connecting link pushes the moving head backwards
and forwards, the intermediate lever acting on the ordinary slotted lever by means
of a metal link or rod. By shifting this link above or below the centre pivot of
the intermediate lever the slotted lever starts the throw of the bell crank connecting
link from left to right, or from right to left, at the will of the operator.
My said invention which relates to improvements in hemstitching and other
sewing machines, particularly those made on the Thomas principle, has for its
object to obviate the trouble and dirt caused by having to roll up large sheets and
other bulky articles under the arm of the machine in order to produce the "spoke"
"ladder" or similar stitches, by reversing the action of the moving head and
causing it to sew on and off the "body" of the material instead of the hem."
"
"
I obtain this by the use of an intermediate or supplementary lever having a slot
extending above and below its centre of motion. This intermediate lever is con-
nected to the usual slotted lever by a link and is actuated by a stud and roller at
its lower end working in a groove in the usual gearel cam. The ordinary slotted
lever is cut off at its pivot, and is not moved by the geared cam, but obtains its
motion from the intermediate lever through the link. By shifting this link in the
slot above or below the centre point of the intermediate lever, the slotted lever
is started to move from left to right or from right to left at the will of the
operator.
This can be understood by reference to the drawing herewith A is the usual
bell crank connecting link which conveys the motion to the moving head and is
moved by the slotted lever B, the length of the throw being regulated in the usual
way by the slot in the head of B. Ba is the pivot on which B swings and Bc is
the stud or pivot on which the link C is fastened. D is the intermediate lever
containing a curved slot extending above and below its centre of motion or pivot Da,
and carrying at its lower end a stud and roller Db working in a groove in the geared
cam E.
By this arrangement it is evident that the motion of the lever B, and therefore
of the bell crank connecting link A can be made to start from right to left or from
left to right by simply shifting the link C above or below the centre of motion in
the lever D.
Dated this 20th day of April 1892
COMPLETE SPECIFICATION.
Improvement in Sewing Machines.
I, GEORGE BENSON 48 & 50 Fountain Street Belfast Manufacturer do hereby
declare the nature of this invention and in what manner the same is to be
5 performed, to be particularly described and ascertained in and by the following
statement:
This invention which relates to improvements in hem stitching and other sewing

page_text: machines, has for its object to obtain a reverse or backward stitch in addition
to the ordinary stitch on one and the same sewing machine.
This object
is obtained by the use of a supplementary or intermediate lever, acting on the
ordinary slotted lever, which through the bell crank connecting lever pushes
the moving head backwards and forwards, this intermediate lever acting on the
ordinary slotted lever by means of a metal link or rod. By shifting this link
above or below the centre pivot of the intermediate lever the slotted lever starts
the throw of the bell crank connecting lever from left to right or from right to left
at the will of the operator.
My said invention which relates to improvements in hem stitching and other
sewing machines particularly those made on the Thomas principle, has for its
object to obviate the trouble and dirt caused by having to roll up large sheets
and other bulky articles under the arm of the machine in order to produce the
"spoke ""ladder
or similar stitches by reversing the action of the moving
head, and causing it to sew on and off the "body" of the material instead of
the "hem."
"
I obtain this by the use of an intermediate or supplementary lever having a slot
extending above and below its centre of motion. This intermediate lever is con-
nected to the usual slotted lever by a link, and is actuated by a stud and roller at
its lower end working in a groove in the usual geared cam.
The ordinary slotted lever is cut off at its pivot, and is not moved by the geared
cam, but obtains its motion through the link from the intermediate lever. By
shifting this link in the slot above or below the centre point of the intermediate
lever the slotted lever is started to move from left to right, or from right to left, at
the will of the operator. This can be understood by reference to the drawing left
with Provisional Specification.
A is the usual bell crank connecting lever which conveys the motion to the
moving head, and is moved by the slotted lever B, the length of throw being
regulated in the usual way by the slot in the head of B. Bu is the pivot on which
B swings and Be is the stud or pivot on which the link C is fastened. D is the
intermediate lever containing a curved slot extending above and below its centre
of motion Da; and carrying at its lower end a stud and roller Db working in a
groove in the geared cam E.
By this arrangement it is evident that the motion of the lever B and therefore
of the bell crank connecting lever A can be made to start from right to left, or
from left to right, by simply shifting the link C above or below the centre of motion
in the lever D.
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) The substitution of an intermediate lever D having a slot extending above
and below its centre of motion and actuated by a roller in its lower end working in
the geared cam for the ordinary slotted lever B working directly on the bell crank
connecting lever A, and
(2) Connecting it to the ordinary slotted lever B by the link C thereby enabling
the motion of the slotted lever B to be altered at will by moving the link C above
or below the centre of motion of the intermediate lever D.
Dated this 19th day of September 1892.