IMPROVEMENTS IN SPRING MOTORS FOR WORKING SEWING MACHINES OR OTHER SMALL MACHINES
Year: 1878

page_text: LETTERS PATENT to Gerard Wenzeslaus von Nawrocki, of the Firm of J.
Brandt and G. W. v. Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany,
Patent Agents, for the Invention of "IMPROVEMENTS IN SPRING MOTORS FOR
WORKING SEWING MACHINES OR OTHER SMALL MACHINES." A communica-
tion from Rudolph Tillmanns, of Zeitz, Germany.
Sealed the 16th May 1879, and dated the 20th November 1878.
PROVISIONAL SPECIFICATION left by Gerard Wenzeslaus von Nawrocki at
the Office of the Commissioners of Patents on the 20th November 1878.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W. v.
Nawrocki, of 124, Leipsigerstrasse, Berlin, Germany, Patent Agents.
"IMPROVE-
MENTS IN SPRING MOTORS FOR WORKING SEWING MACHINES OR OTHER SMALL
MACHINES." (A communication from Rudolph Tillmanns, of Zeitz, Germany.)
This Invention consists in the application of two or more helical springs placed
one within the other, also in the clutching in of one or more by wheel gearing
separated helical springs, of which one is situated close to the place where the power
is given out, and thus allows of an immediate setting in motion of the apparatus
when the brake is released.
Assuming two helical springs to be used, one placed turn by turn within the
other, these are at one end fastened to the inside circumference of a drum, the
parts which rub or slide against one another must be carefully finished and suitably
lubricated, say, by means of black lead, in order to avoid loss by friction as.much
as possible. The mode of fastening to the drum is such that the end of the outer
spring can slide a little relatively to the other spring, which latter is formed with a
slot for the thickened end of the outer spring, corresponding with the fastening bolt
of the said outer spring to slide in.
As above stated, the number of superposed springs may be increased so that a
kind of compound or layer spring is obtained. With a minimum volume this spring

page_text: is considerably lighter than one single spring of the same thickness as the collective
thicknesses of two or all, and possesses a maximum power.
The springs are tightened up by turning the drum round, which for this purpose
is provided with a tooth wheel rim, and by means of wheel gearing and a crank
handle on the flywheel the springs may be tightened or "wound up." A brake
roller appliance acting against the outside of the drum prevents the latter from
running back. The power is given off from the drum spindle by means of tooth
wheel gearing, and V or other pulley for transmission to the sewing or other machine
to be driven. Between two of the tooth wheels a helical spring is arranged, being
fastened at one end to the spindle of one wheel, and at the other end to a drum
carrying the rim of the other tooth wheel. In a similar manner a helical spring may
be arranged between one or two parts of the tooth wheels.
The pulley has a brake rim, against which brake blocks may be applied by
means of a cam or eccentric when the motor is to be stopped. By the action of the
impelling helical spring the other helical spring or springs will be put in tension,
and cause the motor to start at once when the brake blocks are released.
All the spindles have their bearings in suitable frames or bars, which are united
to one another, and to the outer box containing the whole apparatus in any suitable
manner.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said. Gerard Wenzeslaus von Nawrocki in the Great Seal Patent Office
on the 20th May 1879.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W. v.
Nawrocki, of 124, Leipzigerstrasse, Berlin, Germany, Patent Agents. " IMPROVE-
MENTS IN SPRING MOTORS FOR WORKING SEWING MACHINES OR OTHER SMALL
MACHINES." (A communication from Rudolph Tillmanns, of Zeitz, Germany.)
The object of this Invention is to utilize the power stored up in winding a spiral
spring in a drum as for moving sewing machines and other small machines. Although
this in itself is an advantageous mode of application of power, it has hitherto not
obtained much favor or general application it is believed, mainly, because it has been
practically impossible to construct springs beyond certain limits of strength, which
after lengthened wear retained their elasticity.
Spring motors as heretofore generally constructed have also had the defect that
the power stored up therein was too far from the place where the power was to be
given up, involving the intervention of a certain time between the starting of the
motor or release of its brake and the obtaining of the full or normal velocity.
This is particularly unpleasant in cases where the motor has to be stopped and
started often during the work. The inventor's aim is to avoid both these
defects.
.
This Invention consists in the application of two or more helical springs placed
one within the other, also in the clutching in of one or more by wheel gearing
separated helical springs, of which one is situated close to the place where the
power is given out and thus allows of an immediate setting in motion of the
apparatus, when the brake is released.
On the accompanying Drawings is shewn a spring motor constructed according
to this Invention, and adapted to the driving of a "Singer" sewing machine.
Figure 1 is a front view of the motor placed in a box, the front plate or lid of
which is removed; Figure 2 is a horizontal section on line A, B, Figure 1; Figure 3,
a back view, with the back plate of the box removed; and Figure 4, a vertical
section on line C, D, Figure 2; Figure 5 is an enlarged part view of the helical
springs, which form a leading feature of the Invention.
Assuming two helical springs to be used as here shewn, one placed turn by turn
within the other, these are at one end fastened to the inside circumference of a
drum A, and at the other end to the spindle B; the parts which rub or slide against
one another must be carefully finished and suitably lubricated, say, by means of
black lead, in order to avoid loss by friction as much as possible. The mode of
fastening to the drum A is such that the end of the outer spring a' can slide a little
relatively to the other spring a, which latter, as shewn enlarged at Figure 5, is
formed with a slot for the thickened end c of the outer spring, corresponding with
the fastening bolt & of the said outer spring a¹ to slide in.
As above stated, the number of superposed springs may be increased, so that a
kind of compound or layer spring is obtained. With a minimum volume this spring
is considerably lighter than one single spring of the same thickness as the collective
thicknesses of two or all, and possesses a maximum power.
The springs are tightened up by turning the drum A round, which for this purpose
is provided with a tooth wheel rim f, and by means of wheel gearing g, h, i, and a
crank handle on the flywheel %, the springs may be tightened or "wound up," as
shewn in Figure 2. A brake roller appliance acting against the outside of the
drum A prevents the latter from running back. The power is given off from the
drum spindle B by means of tooth wheel gearing m, n, o, p, q, r, s, t, and V, or other
pulley w, for transmission to the sewing or other machine to be driven. Between
two of the tooth wheels and o a helical spring is arranged, being fastened at one
end to the spindle of one wheel n, and at the other end to a drum D carrying the
rim of the other tooth wheel o.

page_text: In a similar manner one or more helical springs may be arranged between one or
two pairs p, q, and r, s, of the tooth wheels."
The V pulley whas a brake rim u, against which brake blocks v may be applied
by means of a cam or eccentric x when the motor is to be stopped. By the action
of the impelling helical springs a, a¹, the other helical spring (or springs) D will be
put in tension and cause the motor to start at once when the brake blocks vare
released. The spring D may be single or multiple, and may in the latter case also
be used for storing up of power.
All the spindles have their bearings in suitable frames or bars y, which are united
to one another and to the outer box containing the whole apparatus in any suitable
manner.
And having thus described and ascertained the nature of this Invention, I declare
that I claim as the Invention communicated to me,-
Firstly. The combination in a spring motor of two or more helical driving springs,
substantially as herein described and shewn, for the purpose of obtaining greater
durability and elasticity than by a single spring.
Secondly. The arrangement and combination in spring motors of a second spring
or one or more combined springs, which are separated by wheel gearing, substantially
as described.
Thirdly. The arrangement of a spring or system of springs in the immediate
vicinity of the place where the power is given out, whereby the motor is immedi-
ately put in motion when the brake is released.
Fourthly. The general arrangement and combination of parts as shewn in the
Drawings.
In witness whereof, I, the said Gerard Wenzeslaus von Nawrocki, have here-
unto set my hand and seal, this Seventeenth day of May, in the year of
our Lord One thousand eight hundred and seventy nine.
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