AN IMPROVEMENT IN SEWING MACHINES
Year: 1876

page_text: LETTERS PATENT to Nahum Salamon, of Ludgate Hill, in the City of London,
Sewing Machine Factor, for the Invention of "AN IMPROVEMENT IN SEWING
MACHINES." A communication from abroad by Henry Lippman and William
Lind, both of Hamburg, North Germany.
ealed the 4th August 1876, and dated the 9th June 1876.
PROVISIONAL SPECIFICATION left by the said Nahum Salamon at th
Office of the Commissioners of Patents on the 9th June 1876.
NAHUM SALAMON, of Ludgate Hill, in the City of London, Sewing Machine
Factor. "AN IMPROVEMENT IN SEWING MACHINES."
The object of this Invention is to provide a facile means for working sewing
machines by mechanical or by hand power, as convenience may dictate, by throwing
the fly-wheel driver which carries the crank handle readily into or out of action.
For this purpose I fit the fly wheel pulley or driver carrying the crank handle,
and which is used for driving the machine by hand, on a stud axlo projecting from
a link pivotted to the bracket arm. This link is free to rock on its pivot pin, and
below it I fit a cam lever for the purpose of rocking the link, and thereby lifting or
lowering the fly wheel out of or into gear. The motion of the fly wheel I transmit
to the driving shaft of the machine, by preference through interlocking friction
surfaces, the friction pulley on the driving having also a groove to receive a
driving belt from a treadle or other motivo power mechanism. The link which
carries the hand wheel is recessed on its upper side to receive a coiled spring and
loose stud, and standing above this stud and tapped into a lug on the bracket arm
is an adjusting screw, by turning which the spring may be caused to hold down the
fly wheel in contact with the friction pulley of the driving shaft. This spring
will, however, yield to the upward pressure of the lifting lever and allow the fly
wheel pulley to be lifted out of goȧr when it is desired to drive the machine by
means of a band.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Nahum Salamon in the Great Seal Patent Office on the 8th December
1876.
NAHUM SALAMON, of Ludgate Hill, in the City of London, Sewing Machine
Factor. "AN IMPROVEMENT IN SEWING MACHINES." A communication from
abroad by Henry Lippman and William Lind, both of Hamburgh, North Germany.
The object of this Invention is to provide a facile means for working sewing
machines by mechanical or by hand power, as convenience may dictate, by throwing
the fly-wheel driver which carries the crank handle readily into or out of action.
In the accompanying Drawing Fig. 1 shows in side elevation so much of a sewing
machine with the improvement applied thereto as will serve to explain both the
nature and action of the Invention. Fig. 2 is a partial plan view of the same, and
Fig. 3 is an end elevation of the sewing machine.
In these Figures A is the main framing of the machine; B, the reciprocating arm
for working the shuttle; C, the cam shaft which communicates motion to the
reciprocating arm B, and other operating parts of the machine; D is a band and
friction pulley keyed to the shaft C; and E is the fly wheel pulley or driver by
which motion is given through frictional contact to the pulley D and its cam shaft
when the machine is driven by hand. This fly wheel pulley or driver which
carries the crank handle is mounted loosely on a stud axle F projecting from a
link F¹, which is pivotted by a pin F2 to the bracket arm A. This link is free to
rock on its pivot pin under the action of a cam lever G, which is pivotted by a
screw pin Gf to the bracket arm A immediately below the link F¹. The object of
this arrangement is to lift the fly wheel out of or lower it into gear with the
driving pulley D. The motion of the fly wheel it will be seen by reference to
Figures 1 and 3 is transmitted (to the cam shaft C of the machine) by preference
through interlocking friction surfaces, the friction pulley D having also a groove
to receive a driving belt from a treadle or other motive power mechanism. The
link F¹, which carries the hand wheel E, is recessed, and its upper side (seo the
detached views Figures 4 and 5) to receive a coiled spring and loose stud f¹.
Standing above this stud and tapped into a lug a on the bracket arm is an adjusting
screw H, by turning which the spring may be caused to hold down the fly wheel
in contact with the friction pulley of the driving or cam shaft C, as shewn in the
Drawing, at which time the link F will take the position shewn in Fig. 4. This
spring will, however, yield to the upward pressure of the lifting lever G upon the
under side of the link F¹ when that lever is moved from the position of Fig. 4 to
that of Fig. 5, and thereby allow the fly wheel pulley to be lifted out of gear when
it is desired to drive the machine by means of a band working over the pulley D.
To bring the fly wheel again into action it will only be necessary to turn the
lever from its position in Fig. 5 to the position shown at Fig. 4 when the spring f
released from the upward pressure of the lever will force down the link F¹, and
bring the fly wheel driver again into contact with the pulley on the cam shaft.
Having now set forth the nature of the Invention of "An Improvement in Sewing
Machines" as communicated to me by my foreign correspondents, and explained
the manner of carrying the same into effect, I wish it to be understood that under
the above in part recited Letters Patent I claim the arrangement above described for
throwing the driving wheel which carries the crank handle into and out of action.
In witness whereof, I, the said Nahum Salamon have hereunto set my hand
and seal, the Seventh day of December, in the year of our Lord One
thousand eight hundred and seventy-six.
N. SALAMON. (L.S.)