Invention TO ABTOVITALD ENTS IN SAWING MACHINES.
Year: 1874

page_text: LETTERS PATENT to Henry Lomax, of Over Darwen, in the County
of Lancaster, Sewing Machine Maker, and George Francis Bradbury,
of Oldham, in the County aforesaid, Sewing Machine Maker, for the
T
A "
Invention
TO
ABTOVITALD
ENTS IN SAWING MACHINES.'
"
PROVISIONAL SPECIFICATION left by the said Henry Lomax and
George Francis Bradbury at the Office of the Commissioners of
Patents, with their Petition, on the 21st January 1874.
We, HENRY LOMAX, of Over Darwin, in the County of Lancaster,
Sewing Machine Maker, and GEORGE FRANCIS BRADBURY, of Oldham,
in the County aforesaid, Sewing Machine Maker, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN SEWING MACHINES," to
be as follows :-
:-
.
This Invention relates to improvements in sewing machines, and
consists in the use and employment of a grooved or slotted lever (and
link or other mechanical equivalent), for the purpose of actuating and
imparting proper time and motion to the needle in lieu of other

page_text: 66
movements for the same purpose, and also to secure a more ample
supply of thread to the needle, by means of which a larger shuttle may
be used without having to increase the length of stroke of the needle.
This lever is free to move on a stud; its motion is derived from a
"
runner working within the groove or slot of the lever on a pin
attached to a rotating disc on the front end of the first motion shaft of
the machine, the form of groove or slot in the lever being such as
through the intervention of a link connecting the lever with the needle
bar to impart thereto the required motion. This arrangement admits of
the use of a very short needle bar, and with little weight in it.
The thread that supplies the needle is passed through an eyelet at the
end of the grooved or slotted lever, whereby it receives more motion than
is given to the movement of the needle.
Instead of using the end of the slotted lever for the purpose of paying
out and taking up the slack thread for the needle, a separate or
independent lever may be used, and the necessary movement may be
given to it either by the same pin that moves the slotted lever or by a
proper shaped tappet formed on the disc at the front end of the top
driving shaft.
The fulcrum of this lover may be altered so as to vary the time a
at which the stitch is drawn up, thereby varying the character of the
stitch.
The needle bar we construct of such form as to be received and work
in a dovetail or angular slot formed in the presser leg.
The cam lever employed for operating the shuttle may have the
position of its fulcrum changed or altered readily, there being an
adjusting slot provided, whereby the fulcrum may be moved according
to the character of the stitch required.
The shuttle may be operated by means of a rotating disc and double
crank link in connection with a diametrical cam fixed near the front end
of the machine and under the table. In this case the time at which the
stitch is drawn up may be varied by turning the diametrical cam on its
axis, and fixing it in a different position, so as to vary the character of
the stitch.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Lomax and George Francis Bradbury in the
Great Seal Patent Office on the 21st July 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, HENRY
LOMAX, of Over Darwin, in the County of Lancaster, Sewing Machine
Maker, and GEORGE FRANCIS BRADBURY, of Oldham, in the County
aforesaid, Sewing Machine Maker, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-first day of January, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said Henry Lomax and George Francis
Bradbury, Her special licence that we, the said Henry Lomax and George
Francis Bradbury, our executors, administrators, and assigns, or such
others as we, the said Henry Lomax and George Francis Bradbury, our
executors, administrators, and assigns, should at any time agree with
and no others, from time to time and at all times thereafter during
the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN SEWING MACHINES," upon the condition (amongst others)
that we, the said Henry Lomax and George Francis Bradbury, our
executors or administrators, by an instrument in writing under our, or
their, or one of their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the.
same was to be performed, and cause the same to be filed in the Great
Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that we, the said Henry Lomax and George
Francis Bradbury, do hereby declare the nature of our said 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 certain improvements in sewing machines,

page_text: (and link or other mechanical equivalent), for the purpose of actuating
and imparting proper time and motion to the needle in lieu of other
movements for the same purpose, and also to secure a more ample
supply of thread, by mans of which a larger shuttle may be used
without having to increase the length of stroke of the needle. This
lever is free to move on a stud; its motion is derived from a "runner"
working within the groove or slot of the lever on a pin attached
to a rotating disc on the front end of the first motion shaft of the
machine, the form of groove or slot in the lever being such as through
the intervention of link connecting the lever with the needle bar to
impart thereto the required motion. This arrangement admits of the use
of a very short needle bar, and with little weight in it.
-
The thread that supplies the needle is passed through an eyelet at the
end of the grooved or slotted lever, whereby it receives more motion than
is given to the movement of the needle.
Instead of using the end of the slotted lever for the purpose of paying
out and taking up the slack thread for the needle, a separate or
independant lever may be used, and the necessary movement may be
given to it either by the same pin that moves the slotted lever, or by a
proper shaped tappet formed on the disc at the front end of top driving
shaft.

page_text: Fig. 1 is a front view of part of the machine (with front plate removed
in order to shew more clearly the construction of the apparatus), shewing
the rotary disc and runner for operating the grooved or slotted lever for
actuating and turning the needle bar; Fig. 2 shews the said lever in
position.
Fig. 6 is an elevation of the cam lever for operating the shuttle,
shewing means whereby the fulcrum of this lever may be altered or
changed according to the character of the stitch required.
A is the ordinary rotary disc having runner 6%; the latter is received
within the groove or slot e of the lever d, to which it imparts motion on
its fulcrum pin e¹; f is a link connecting the lever d with the needle
bar f¹. At 9 is shewn an eyelet or guide eye for the paying out and for
taking up needle thread, or in liew of the guide eye g the lever / may be
employed, being operated and turned by means of the runner 6, or cam
or tappet may be employed; h¹ is a slot hole, by means of which the
taking up of the thread and stitch so as to have the needle thread tighter
than the shuttle thread or slacker, according to requirement; J is the
needle bar, and K the presser leg in which the needle bar J works; Lis
the presser foot, which as shewn forms part of the said presser leg; M is
the cam or slotted lever for operating the shuttle. This lever is as shewn
mounted on a fulcrum, which is adjustable by means of the wing nut
and screwed or chased end of the fulcrum stud, so that the movement
of the shuttle may be varied and timed, that is to say, when the needle
thread is drawing the shuttle thread up to complete the stitch the
movement of the shuttle may be such as to give the amount of thread
(with facility), according to the nature of the said threads used and of
material being operated upon.
Having thus fully described the nature and particulars of this our
Invention, together with the manner in which the same is to be or may

page_text: be performed or carried into practical effect, we would have it understood
that we claim,-
Firstly. The construction and use of the lever B for operating the
needle bar, as herein described and illustrated by Drawings.
Secondly. The application and use of the link F in combination with
the lever B, as and for the purpose herein described.
Thirdly. The lever H adjustable, and as described and illustrated.
Fourtly. The use of the presser leg, constructed so as to receive and
form a slide for the needle bar.
Lastly. The adjustable fulcrum of the lever P, as and for the purpose
herein fully described and shewn by Drawings.
In witness whereof, we, the said Henry Lomax and George Francis
Bradbury, have hereunto set our hand and seal, this Eighteenth
day of July, in the year of our Lord One thousand eight hundred
and seventy-four.
HENRY LOMAX.
(L.S.)
GEO. F. BRADBURY. (L.S.)