IMPROVEMENTS IN SEWING MACHINES
Year: 1873

page_text: LETTERS PATENT to Edward Griffith Brewer, of 89, Chancery Lane,
in the County of Middlesex, Patent Agent, for the Invention of
"IMPROVEMENTS IN SEWING MACHINES.”—A communication from abroad
by Thomas Henderson and William Wright, both of the City of
Canada
PROVISIONAL SPECIFICATION left by the said Edward Griffith Brower
at the Office of the Commissioners of Patents, with his Petition,
on the 2nd October 1873.
I, EDWARD GRIFFITH BREWER, of 89, Chancery Lane, in the County
of Middlesex, Patent Agent, do hereby declaro the nature of the said
Invention for "IMPROVEMENTS IN SEWING. MACHINES," (a communication to
me from abroad by Thomas Henderson and William Wright, both of
the City of Hamilton, in the Province of Ontario, Canada), to be as

page_text: combined a thread shifter operated by suitable mechanism, whereby the
shuttle thread is moved to the right and left of the shuttle as the latter
revolves in its race, by which arrangement the usual twisting and un-
twisting of the thread are prevented.
The shuttle carrier is on the driving shaft. On the samo' shaft is
keyed a small pinion, and immediately below it is a larger gear, which
is keyed to a shaft or spindle from a projection, and which moves or
revolves with one-half the speed of the upper pinion.
"
Attached to the pinion is a cam, the revolution of which imparts an
oscillating movement to a hooked thread shifter and take-up by means
of a horizontal bar pressing upwards against it. The said thread shifter
is fastened to the base or bed of the machine by a screw. One end
of a small flat spring is fastened to the race, and the opposite ends push
on the thread shifter. The shuttle thread is carried into a vertical
groove in the shuttle race prepared for it, and at each alternato revolu-
tion of the shuttle the cam-operates the hooked take-up, which catches
the thread and draws it outwards and slackens it again at the instant
when necessary: The shuttle thus passes to the right and left of its
own thread without injury to the twist of the thread.
--
TEX
The shuttle is held in the shuttle race by the shuttle carrier, which is
keyed to end of shaft. The top of shuttle is of a circular form to
correspond with and fit the circular race; it is threaded from the lower¨
side. A curved portion of the shuttle carrier enters a notch in the
shuttle, and holds it securely in its place.
When it is necessary to remove the shuttle from the race for the
purpose of threading the bobbin it may be taken out through an opening
in the cloth plate, which will be immediately over the top of the race
and covered with a slide, or it may be taken out from the back of the
race by removing a spring from the shuttle carrier; or it may be removed
from the front of the race, and covering it with a slide.
The cloth plate is secured to the machine by two screws, so that it can
be easily removed to clean the parts without interfering with any of the
working machinery underneath it. None of the said parts are connected
to the cloth plate.
In order to keep the thread off the oil the thread is carried from tho
spool to an eyelet on the top of the head, thence downward to the tension

page_text: B
washers, thence upward to a projection on the heart motion, which slides
in a slot, and from that to an offset to the right on the bottom of the
needle bar. The thread may be made to pass through a hole in the said
offset, or pass down by the side of it, as may be found convenient.
The advantages of this machine are.—
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Edward Griffith Brewer in the Great Seal Patent
Office on the 2nd April 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
GRIFFITH BREWER, of 89, Chancery Lane, in the County of Middlesex,
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of October, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Edward Griffith Brewer, Her
special licence that I, the said Edward Griffith Brewer, my executors,
administrators, and assigns, or such others as I, the said Edward
Griffith Brewer, my 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," (a communication' to
me from abroad by Thomas Henderson and William Wright, both of the
City of Hamilton, in the Province of Ontario, Canada,) upon the condition
(amongst others) that I, the said Edward Griffith Brewer, my executors
or administrators, by an instrument in writing under my, 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
...

page_text: the screw M. One end of a small spring S is fastened to the race G,
and the opposite end pushes on the thread shifter, as shown in Fig. 2.
The shuttle thread is carried into a vertical groove Y in the shuttle race
prepared for it, and at each alternate revolution of the shuttle the cam L
operates the hooked take-up, and catches the thread and draws it out-
wards, and slackens it again at the instant when necessary. The shuttlo
thus passes to the right and left of its own thread without injury to the
twist of the thread.
The shuttle is held in the shuttle race by the shuttle carrier I, which
is keyed on the end of the shaft Q. The peculiar form and construction
of the shuttle are seen in Fig. 5; the top of it is of a circular form to
correspond with and fit the circular race G. It is threaded from the
lower side. The arrows show the direction of the shuttle.
When it is necessary to remove the shuttle from the race for the
purpose of threading the bobbin, &c., it may be taken out through an
opening in the cloth plate, which will be immediately over the top of
the race and covered with a slide, or it may be taken out from the back
of the race by removing a spring from the shuttle carrier.
The cloth plate a is secured to the machine by two screws c and d, so
› that it can be easily removed to clean the parts without interfering with
any of the working machinery underneath it. None of the said parts
are connected to the cloth plate.
In order to keep the thread off the oil the thread may be carried from
the spool to an eyelet T on the top of the head A, thence downward to
5 the tension washers S', thence upward to a projection R on the heart
motion, and then to the eye of the needle.
The advantages of this machine are, it runs smoothly, without much
vibration; the arrangement of the take-up or thread shifter prevents the
thread from untwisting.
Having now described the nature of the said Invention, and in what
manner the same is to be performed, I declare that I claim,―
First. A shuttle H arranged within the circular race G, and adapted
to have a continuous rotary movement, combined and operating in con-
nection with the thread shifter J substantially as described, whereby the
5 shuttle thread is moved to the right and left of the shuttle as the shuttle
revolves in its race.

page_text: Second. The shuttle H, circular race G, thread shifter J, and spring S,
in combination with the cam L and gear N, O, substantially as and for
the purpose specified.
In witness whereof, I, the said Edward Griffith Brewer, have here-
unto set my hand and seal, this Twenty-eighth day of March, in 5
the year of our Lord One thousand eight hundred and seventy-
four.