IMPROVED DRIVING GEAR FOR SEWING MACHINES WITH MOTIVE OR FOOT POWER
Year: 1884

page_text: DIECIFICATION.
I JOHN PETER MALVIN MILLARD of N° 28 Southampton Buildings, in the
County of Middlesex, Clerk do hereby declare the nature of my Invention for
IMPROVED DRIVING GEAR FOR SEWING MACHINES WITH MOTIVE OR FOOT POWER
(a communication from abroad by Eduard Petzoldt and Otto Georg Deil both of
Dresden, Saxony, German Empire Engineers and in what manner the same is to
bo performed, to be particularly described and ascertained in and by the following
statement:
This Invention relates to an improved driving gear for sewing machines so as to
be able to drive a large number of sewing machines from one main shaft by means
of a suitable motive power, and to a further arrangement by means of which the
operation of the said motive power can be cut off and the machines be driven
by foot power.
This combination is absolutely necessary as even with factory work it very often
occurs that a slow and repeatedly interrupted. sowing is required.
Figure 1 of the accompanying drawings represents a side view and Figure 2 an
elevation of the improved driving gear.
The frame work for the driving gear serves at the same time as frame for the
sewing machine the bed or table of which is screwed or otherwise attached to the
feet or standards of the frame of the driving gear.
Each standard or frame is provided with a bearing for the main shaft a, which
said bearing is screwed or bolted to the said frame or can be cast of one piece with
the standards or frame work.
The drum or disc b on the main driving shaft transmits its power to a frictional
disc c which is covered with leather or other suitable material and is suspended
free in a double framework d, d¹.
This said frictional disc operates on the other hand on a double disc e e¹³ of which
said double disc the part e¹ serves as strap or cord drum for the driving strap or
cord of the sowing machine.
The double frame d d of the friction drum or disc c moves around a common
axis the outer frame d being connected to the treadle g by means of a connecting
rods, the inner frame being suspended on a strong spring fattached to the table m.
The object of this arrangement is to bring the friction drum or disc c out of
gear with the drums or discs be when the machine is not in operation as shown
in Figure 1.
•
If the treadle g is now depressed the connecting rod is also depressed and the
friction drum or disc brought into gear with the drums or discs be so that the

page_text: '
motive power received by a from the drum or disc b on the main driving shaft is
transmitted to the drum or disc e.
In this case the spring fis extended or put under tension. If the handle is now
given free the spring will withdraw the drum or disc c out of contact with the
discs bc and put the brake in operation which acts on the fly wheel of the sewing
machine and causes an immediate stoppage of the same.
The brake consists of the bell crank lever n n' which moves at the upper end
on the pivot or axis o and is at the lower end movably connected to the frame of
the frictional drum or disc c.
The upper arm n' is curved in like manner with the wheel of the sewing
machine, is covered with leather and acts as brake.
A fly wheel p is attached to the shaft or spindle w which carries the double drum
or disc e e¹ and is driven by means of a treadle and connecting rod.
The brake is released with the one foot by depressing the treadle g but the
latter is only moved so far that the frictional disc c does not come in contact with
the other drums or discs be and then the fly wheel p set in motion with the other
foot.
The shaft wis carried in moveable bearings and is provided with a tappet r
which gears with a pawl 8 on the drum or disc e which said pawl is kept in gear
with the tappet r by means of a spring t.
If the shaft w is inade to rotate the tappet r gears with the pawl 8 and causes
the double drum or disc e e¹ to make a like revolution.
If motivo power is employed the shaft wis not in operation, only the drum or
disc e e¹ is rotated whereby the said double drum or disc being rotated in an
opposite direction the pawl s glides over the tappet r but does not gear with the
same.
It is evident from the foregoing that this present invention consists of a
combined driving gear for foot and motive power of an extremely simple, durable
and light construction and that the rapidly and efficaciously operating brake
enables us to overcome all the difficulties hitherto experienced in employing motive
power for driving sewing machine³.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that what
I claim is:-
1-In an improved driving gear for sewing machines for motive and foot power
the freely suspended friction drum or disc c which transmits the power received
from the drum b to the double drum or disc e e¹ in combination with the coupling
or connection formed by the treadle g, connecting rod z spring f and with the
lever brake n n for operating on the fly wheel when motivo power is employed
substantially as described in the foregoing specification and shown in the accom-
panying drawings.
2-In an improved driving gear for sewing machines for motive and foot power,
the transmission of the power, when foot power is employed, from the shaft w to
the double drum or disc e e¹ by means of the tappet on the shaft w and the
pawl & which is forced into gear with tho said tappet by a spring whereby the
friction drum or disc c is put out of operation and the brake n n¹ released by
lightly pressing on the treadle g substantially as described and shown in the
accompanying drawing.
Dated this 8th day of November 1881