IMPROVEMENTS IN SEWING MACHINES
Year: 1878

page_text: LETTERS PATENT to Alfred Vincent. Newton, of the Office for Patents, 66,
Chancery Lane, in the County of Middlesex, Mechanical Draughtsman, for the
Invention of "IMPROVEMENTS IN SEWING MACHINES." A communication from
abroad by John William Julius Thiemer, of Wandsbeck, in the Province of
Schleswig Holstein, North Germany.
Sealed the 30th August 1878, and dated the 28th May 1878.
PROVISIONAL SPECIFICATION left by the said Alfred Vincent Newton at
the Office of the Commissioners of Patents on the 28th May 1878.
ALFRED VINCENT NEWTON, of the Office for Patents, 66, Chancery Lane, in the
County of Middlesex, Mechanical Draughtsman. "IMPROVEMENTS IN SEWING
MACHINES." [A communication from abroad by John William Julius Thiemer, of
Wandsbeck, in the Province of Schleswig Holstein, North Germany.]
This Invention relates to the driving gear of sewing machines, the object being
to prevent the transmission of motion through the driving pulley or hand wheel to
the sewing mechanism when a spool is required to be filled, and to cause the pulley
to act only on the spool winder.
The spur wheel, which transmits motion from the driving pulley to the sewing
mechanism, is loose on the stud pin which carries the driving pulley, and is
independent of that pulley, except when connected therewith by means of a
sliding pin fitted into the hub of the driving pulley. A tendency is given to this
pin, by reason of a coiled spring connected therewith, to project into a hole drilled
through the hub of the spur wheel, and thus lock the wheel and pulley together.
This drilled hole in the hub of the spur wheel is fitted loosely with a pin of such
length as to fill the hole from end to end, and thus prevent, when required, the
locking pin from engaging with the spur wheel.
The spool winder is hinged to the framing of the machine in such position that
its friction pulley may be thrown into contact with the inner periphery of the

page_text: driving pulley by tipping it on its hinge. A stop spring is provided for holding
this spool winder either in or out of action as desired.
Projecting inwards from the frame of the spool winder is a wedge-shaped piece,
which, when the winder is thrown into position for work, is brought up into contact
with the loose pin of the spur wheel, and thrusting it inwards forces out the locking
pin clear of the spur wheel; the rotation of the driving pulley will then cease to
move the spur wheel, and thus the motion of the sewing machine will be arrested,
the continued rotation of the driving pulley serving only to actuate the spool
winder.
In order to adjust the gear wheels with respect to each other an excentric stud
pin is used to carry the driving pulley and spur wheel connected therewith. By
giving this excentric stud pin a slight axial motion, and then fixing it by a locking
screw, the spur wheel may be raised or lowered to a position that will ensure a
smooth action of the gear wheels.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by 1
the said Alfred Vincent Newton in the Great Seal Patent Office on the 28th
November 1878.
ALFRED VINCENT NEWTON, of the Office for Patents, 66, Chancery Lane, in the
County of Middlesex, Mechanical Draughtsman. " IMPROVEMENTS IN SEWING
MACHINES." A communication from abroad by John William Julius Thiemer, of
Wandsbeck, in the Province of Schleswig Holstein, North Germany.
This Invention relates to the driving gear of sewing machines, the object being
to prevent the transmission of motion through the driving pulley or hand wheel to
the sewing mechanism when a spool is required to be filled, and to cause the pulley
to act only on the spool winder.
In the accompanying Drawing I have shewn in several views the mechanism for
effecting this object.
Fig. 1 is a side elevation of so much of a sewing machine, with the improvements
applied thereto, as will serve to illustrate the Invention, and Fig. 2 is a sectional
plan view of the same, shewing the driving pulley disengaged from its spur driving
.wheel.
Fig. 3 is an elevation, shewing the driving gear of the machine in end view.
Fig. 4 is an end elevation, ahewing the spool winder in its acting position, as at
Fig. 3, the driving pulley and spur gear being removed; and Fig. 5 is a sectional
plan, shewing the spur driving wheel locked with the driving pulley.
In these Figures A is the bracket arm, to which is fitted a stud axle B. Upon
this axle are mounted loosely the spur wheel C and the band pulley D, which latter
serves by friction of contact to drive the spool pulley E.

page_text: The spur wheel C transmits motion from the driving pulley to the sewing
mechanism through a pinion C', but it is independent of that pulley, except when
connected therewith by means of a sliding pin & fitted into the hub of the driving
pulley. A tendency is given to this pin, by reason of a coiled spring d¹ connected
therewith, to project into a hole drilled through the hub of the spur wheel C, and
thus lock the wheel and pulley together. This drilled hole in the hub of the spur
wheel is fitted loosely with a pin c of such length as to fill the hole from end to
end, and thus prevent, when required, the locking pin d from engaging with the
spur wheel.
F is the frame of the spool winder, which is pivotted at F¹ to the bracket A of
the machine in such position that its friction pulley may be thrown into contact
with the inner periphery of the driving pulley by tipping it on its pivot pin. A
stop spring F is provided for holding this spool winder, either in or out of action,
as desired, such spring being connected at one end to a pin at the base of the
machine, and at its other end to an eye on the side of the spool frame.
Projecting inwards from the frame of the spool winder is an arm F³, which
carries at its extremity a wedge-shaped piece ƒ capable of being thrust within a
recess a in the bracket A. and surrounding the stud axle B. Into this recess projects
the inner end of the pin c, which is carried by the boss of the spur wheel C.
When the spool frame is thrown into the drawn position of Fig. 4 the wedge-
shaped piece f will enter the recess a, and coming into contact with the pin c will
thrust it back into the boss of the wheel C, thereby forcing back the locking pin d
clear of the spur wheel; the rotation of the driving pulley will then cease to move
the spur wheel, and thus the motion of the sewing machine will be arrested, the
continued rotation of the driving pulley serving only to actuate the spool winder.
F is the spool fitted as usual into its frame, and actuated by the rotation of the
pulley E, in the boss of which it has its bearing.
When the winding of the spool is completed it is only necessary to tip the spool
frame into the dotted position of Fig. 4 to throw the sewing machine again into
action. By thus tipping the spool frame the wedge f will be drawn out of the
recess a, and on the pin d next coming into coincidence with the pin c the latter
will be thrust forward, the pin d entering the boss of spur wheel C, and thereby
locking it and the driving pulley D together.
In order to adjust the spur wheel C with respect to the pinion C¹ which it
drives, the stud axle B is made excentric at that part which enters the bracket A.
By turning this excentric axle slightly in its socket, and then fixing it by a locking
screw b, the spur wheel may be raised or lowered to a position that will ensure a
smooth action of the gear wheels.
Having now set forth the nature of the Invention of "Improvements in Sewing
Machines," as communicated to me from abroad, 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 of mechanism, above described,
for disconnecting the driving pulley of sewing machines from the driving gear of
such machines, for the purpose above set forth.
In witness whereof, I, the said Alfred Vincent Newton, have hereunto set
my hand and seal, this Twenty-eighth day of November, in the year of our
Lord One thousand eight hundred and seventy-eight.