Improvements in the Driving Mechanism of Sewing Machines.
Year: 1893

page_text: Date of Application, 12th May, 1893
Complete Specification Left, 12th Feb., 1894-Accepted, 7th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in the Driving Mechanism of Sewing Machines.
We, DANIEL JONES, Mánaging Director, and HENRY PATTMAN TRUEMAN
Works Manager, both of The Two Reel Lock Stitch Sewing Machine Company,
Limited, of 62 Albion Street, Birmingham, in the County of Warwick, do hereby
declare the nature of this invention to be as follows:-
This invention relates to improvements in mechanism for driving sewing machines
by hand power. On one of the main shafts of the machine is a wheel or disc
(hereinafter for distinction called a wheel) and on a stud conveniently situated in
relation thereto is mounted another wheel or disc (hereinafter for distinction called
a disc). Motion is imparted from the disc to the wheel, in one arrangement where
the two are to rotate in the same direction by means of an endless flexible band of
leather, textile fabric or other suitable material passing around the wheel and the
disc, the speed of the wheel being greater or less according to its diameter
relatively to that of the disc.
To prevent slipping and ensure a positive motion, the flexible band is formed
with boles and the peripheries of the wheel and disc respectively are provided with
pins or studs adapted to engage in said holes. When it is desired that the main
shaft should rotate in an opposite direction to the driving disc, the perforated
flexible band is tightly wrapped round the disc, and the wheel is provided with pins
or studs adapted to enter into and engage with the holes in the flexible band. The
disc may be mounted on a stud fixed to some part of the machine or it may be
mounted on an independent frame which may be fixed in any convenient position
near the machine. The said stud is capable of being moved relatively to the main
shaft for purpose of taking up slack of band it may be by means such as a link or
eccentric. The wheels or discs instead of being provided with projections or studs
may be provided with spikes adapted to pierce the flexible band.
The driving disc of a sewing machine may be provided according to this
invention with a crank handle so arranged and constructed that a variable leverage
corresponding to the resistance of the machine is automatically obtained. Pivoted
near the periphery of the disc is a crank that can be turned through about
180 degrees so that the handle with which it is provided can be caused to occupy a
position approximately corresponding with the centre of the disc when the handle
of the crank would merely revolve about its pin or can be caused to occupy a
position outside the periphery of the disc. A spring is provided which tends to
keep the handle approximately at the centre of the disc, a stop or stops being also
provided to prevent the crank moving through more than 180 degrees. When the
operator applies force to the handle the crank turns about its pivot, until the effect
of the spring exceeds the resistance of the machine. If such resistance is greater
than the spring the crank abuts against its stop and the handle being at the
greatest possible distance from the centre of the disc the greatest leverage is
obtained. When the operator releases the handle the spring at once returns it to
the centre of the disc.
1641
M1802
W. LLOYD WISE,
Per F. J. Brougham,
46; Lincoln's Inn Fields, London, W.C., Agent for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in the Driving Mechanism of Sewing Machines.
We, DANIEL JONES, Managing Director, and HENRY PATTMAN TRUEMAN,
Works Manager, both of The Two-Reel Lock-Stitch Sewing Machine Company
Limited of 62 Albion Street, Birmingham, in the County of Warwick, do hereby
declare the nature of this 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 improvements in mechanism for driving sewing machines
by hand power. On one of the main shafts of the machine is a wheel or disc
(hereinafter for distinction called a wheel) and on a stud conveniently situated
in relation thereto is mounted another wheel or disc (hereinafter for distinction
called a disc). Motion is imparted from the disc to the wheel, in one arrangement
where the two are to rotate in the same direction, by means of an endless
flexible band of leather, textile fabric or other suitable material passing around
the wheel and the disc, the speed of the wheel being greater or less according to its
diameter relatively to that of the disc.
To prevent slipping and ensure a positive motion, the flexible band is formed
with holes and the peripheries of the wheel and disc respectively are provided with
pins or studs adapted to engage in said boles. When it is desired that the main
shaft should rotate in an opposite direction to the driving disc the perforated
flexible band is tightly wrapped round the disc and the wheel is provided with
pins or studs adapted to enter into and engage with the holes in the flexible band.
The disc may be mounted on a stud fixed to some part of the machine; or it may he
mounted on an independent frame which may be fixed in any convenient position
Dear the machine. The said stud is capable of being moved relatively to the main
shaft for the purpose of taking up slack of band it may be by means, such as a link
or by an eccentric. The wheels or discs instead of being provided with
projections or studs may be provided with spikes adapted to pierce the flexible
band.
Referring to the accompanying sheet of drawings,
Fig. 1. is a front elevation of a hand drive for sewing machines constructed
according to this invention.
Fig. 2. is a side elevation partly in section of the same arrangement.
Fig. 3. is an end view of the crank arm shewing the method of folding the handle
against the disc.
Fig. 4. is a front elevation of an arrangement for driving the wheels in opposite
directions.
Fig. 4 is a side elevation of Fig. 4.
Fig. 5. shews another arrangement for effecting the same object.
Similar letters indirȧte similar parts in all the drawings.
In Figs. 1 and 2 A is the main shaft of a sewing machine on which is fixed a
wheel C provided with studs. B is a pin mounted on the swinging link B' which
link is firmly bound to a fixed portion of the machine. On the stud B is mounted the
disc D which is also provided with studs D'. The disc D and the wheel C are
connected by the flexible band E which band is provided with holes E' adapted to
engage with the studs upon the disc D and the wheel C. It is evident that motion
can now be imparted from the disc to the wheel without lost motion. The disc D
is or may be provided with the crank arm G which said crank arm is preferably of
such a length that when it stands in its closed position the crank handle H will
occupy the centre of motion of the disc D. The crank arm G is normally held in
the position of the dotted lines by a spring J which is wound about the stud or pivot
of the arm.
On pressure being applied to the crank in the direction of rotation, the

page_text: crank arm opens out until leverage enough is obtained to drive the machine. The
outward movement of the crank G is limited by a stop peg M fixed in the disc
We prefer
engaging with a projection N formed on the inner side of the crank arm.
to limit the movement of the arm G to about 180 degrees. The crank handle H is
fixed on the crank arm so that it stands at right angles to the face of the disc as
shewn in Fig. 3. When not required for driving the machine this handle can be
folded so as to occupy a position with its axis approximately parallel to the face of
the disc as shewn in the dotted lines Fig. 3.
One means of effecting this adjustment consists in providing steady pegs o o Fig. 3.
which pegs enter holes o', in the crank head and arm respectively. The crank
handle being placed in the desired position is fixed firmly to the arm G by the bind
screw P.
Fig. 4 and 4 is a method of communicating motion in opposite directions. A is.
the main shaft of the machine provided with wheel C and studs. B is the pin and
D the disc provided with studs. I is an idler wheel carried upon an extension of the
stud bracket F. E is a band provided with holes adapted to engage with the studs
of C and D. This band passes round D and 1, one side of the band is engaging with
the studs on the wheel C.
Fig. 5. C is the wheel fixed on the main shaft A of the machine, B is the stud
upon which the disc D revolves. The flexible band E is wrapped around D and the
studs on C enter into holes formed in the said band. Motion in this case would
evidently be in contrary directions as shewn by the arrows in the drawings. Any
of these arrangements may be provided with a fixed crank arm instead of the
folding arm G. Fig. 1. 2. and 3 if desired. Adjustments for tightening the band can
The link F of
be made by turning the link B' Fig. 1. and 2 about its centre.
Fig. 4 and 44, can also be turned about its centre thus tightening the band against
the stud wheel C on the main shaft A. If desired the spring J Fig. 2. about the
pivot K of the crank G may be dispensed with. The crank Ġ can then be
fixed at varying distances from its centre by tightening the nut R at the end of
the pivot K.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare what we
claim is :-
1. In a hand driving mechanism for sewing machines the employment and use of
a flexible band having holes formed therein adapted to engage with studs pins or
spikes fixed upon the driving and driven wheels respectively; substantially as
described and illustrated in Figs. 1. 2. 4. and 44 of the accompanying drawings.
2. In a hand drive for sewing machines the employment and use of a folding
crank arm G adapted to be fixed at varying distances from its centre by means of
nut R (or equivalent device) on the pivot K the spring shewn being omitted.
3. In a hand drive for sewing machines, the employment and use of a folding
crank arm, having a spring wound about its pivot and a stop peg, to limit the motion
all substantially arranged and operating as described in connection with Figs. 1 and 2.
of the accompanying drawings.
4. In a hand drive for sewing machines. Apparatus and mechanism constructed,
arranged, and operating, substantially as described and shewn in connection with the
accompanying sheet of drawings.
Dated this 9th day of February 1894.