AN IMPROVED SEWING MACHINE
Year: 1873

page_text: LETTERS PATENT to Lev Griswold, of the City, County, and State of
New York, United States of America, for the Invention of "AN
IMPROVED SEWING MACHINE."
COMPLETE SPECIFICATION filed by the said Lev Griswold at the Office
"
of the Commissioners of Patents, with his Petition and Declaration,
on the 21st June 1873, pursuant to the 9th Section of the
Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, LEV
GRISWOLD, of the City, County, and State of New York, United States
of America, send greeting.
WHEREAS I am in possession of an Invention for "AN IMPROVED
SEWING MACHINE," and have petitioned Her Majesty to grant unto me,
my executors, administrators, and assigns, Her Royal Letters Patent for
the same, and have made solemn Declaration that I am the first
and true Inventor thereof.

page_text: NOW KNOW YE, that I, the said Lev Griswold, do hereby (cciare
that the following Complete Specification, under my hand and seal,
fully describes and ascertains the nature of the said Invention, and in
what manner the same is to be performed, in and by the following
statement, reference being had to the accompanying Drawing forming a
part of this Specification.
The object I have in view is to produce a sewing machine simple in
construction, durable, partially noiseless, and casy in operation, the
nature of which consists,-
First. In a "take up" for the purpose of holding the thread while the
needle is approaching and before it enters the goods. The object of
holding the thread at this time being to keep the thread taut, allowing it
to slip through the cye of the needle, which if loose at this point would
form a loop which would be caught and carried down into the goods by
the needle making a knotted stitch.
Second. In casting the needle bar and presser bar case the curved arm
and the bracket which sustains the driving gear shaft all in one piece.
Third. In a raw hide bevel pinion placed on the return crank which
plays into the driving geer for the purpose of preventing noise while the
machine is in operation, said crank having for one end of its shaft a
left-handed screw cap with nut.
Fourth. In casting bosses on the under side of the bed plate of the
machine, and attaching thereto clamping plates having handles for the
purpose of fastening said bed plate to its stand or table opposite to where
the said bed plate is hooked or hinged to said table.
Fifth. In placing the cam for operating the needle bar upon an
upright shaft above the bed plate, thereby bringing the fulcrum nearer to
the needle bar, causing a shorter leverage, and consequently less
vibration of the lever, and also placing the fly wheel on said upright
shaft.
Sixth. In a peculiar construction of the shuttle which lets off the
thread from the same with a graduating tension by means of a tripping
plate or presser which is pivoted in the sides of the shuttle, and
operated by an auxilliary plate spring in such manner that the tripping
plate can be thrown up and backward for reception of the cotton

page_text: bar D, and fly wheel shaft E; this arm with the case F and bracket G
which supports the fly wheel shaft being cast in one piece. H is the
spring "take up" composed of the spring I, pin K, and recess L in the
needle bar. M is the adjustable collar on presser bar. N is the raw
hide pinion composed of several layers of raw hide which plays into the
driving geer O; said geer O being directly connected with the treadle by
the rod O. P is the return crank on the lower end of the shaft of which
the raw hide pinion is placed, said pinion being held in position by the
left handed screw Q and nut R. S is the steel step and T the steel
collar which supports the crank, easing the running of the parts in con- 1
nection. E is the fly wheel shaft; V, the cam; W, the fly wheel; and
X, driving shaft; Y, is the shuttle; Z, the drop spring which lays on the
bobbin; and a the auxilliary spring. 6 is the treadle; O¹, the curved
treadle shaft. c are the bosses cast on the under side of bed plate,
and d the clamping plate for fastening the machine to its stand or
table. e is the shuttle case; and f, the shuttle driver, the latter being
cast in one picce; and at g is a thumb screw for adjusting the heighth
of shuttle.
First. I claim the "take up" spring H for the purpose of holding the
thread while the needle is approaching and before it enters the goods, 2
substantially as and for the purposes described.
Second. I claim encasing both needle bar C and presser bar D in
a portion of the casting B, and also casting said casing F, arm B, and
bracket G, which sustains the driving gear shaft all in one piece.
Third. I claim the raw hide bevelled pinion N placed on the return 2
crank P for the purpose set forth and described.
Fourth. I claim casting bosses C on the under side of the bed plate of
the machine, and attaching thereto clamping plates d, substantially as
and for the purposes set forth.
Fifth. I claim placing the cam V for operating needle bar upon the 3
upright shaft E above the bed plate, substantially as and for the purpose
described, and also placing the fly wheel W on said upright shaft.
Sixth. I claim a peculiar construction of the shuttle Y, which lets off
the thread from the same with a graduating tension, substantially as set
forth and described.
Seventh. I claim attaching the treadle directly to the crank by the
3

page_text: driving geer O, dispensing thereby with an intermediate wheel, substan-
tially as set forth and described.
Eighth. I claim shuttle case e and shuttle driver f, the latter being
cast in one piece, substantially as and for the purpose set forth and
described.
In witness whereof, I, the said Lev Griswold, have hereunto set
my hand and seal, this Twenty-ninth day of May, in the year of
our Lord 1873.
Witnesscs,
ARTHUR NEILL.
EMILE DAUPHINOT.
LEV GRISWOLD. (L.S.)