Improvements in Sewing Machines.
Year: 1885

page_text: Improvements in Sewing Machines.
I EWALD BRUNCKER, Civil Engineer, of Lieglar near Troisdorf in the German
Empire do hereby declare the nature of said invention for "IMPROVEMENTS IN
SEWING MACHINES," and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
If the pin of an inclined crank be forced to remain in a plane, by the turning
of the same, which turns around a line as axis going through the cutting point of
the pin and turning axes, the rotary motion of the axle will be transmitted in
a swinging motion, to this plane around the axle.
The accompanying drawings show my invention of the inclined crank and its
properties applied to the construction of sewing inachines.
For the swinging plane I take an arm connected with an axle that can only be
turned in a normal direction by means of a crank, whilst the motion or effect of
the crank upon the turning axle in the other direction, is lifted up by means
of which:-
1 the ring or slipper fastened round it slides to and fro in a fork link &c on an
arm, or
2 the turnable arm bound with the pin can swing round an axle bound fast to
the turning axis.
The combination of the inclined crank with the swinging arm may be called an
inclined crank arm that in paragraph 1 an inclined crank fork, and that in
paragraph 2 an inclined crank lever.
Both connections are applied in three different forms viz.
a) The inclined bent axle.
b) The inclined bent pin, and
c) The inclined eccentric, or inclined axle boss.
Each of these three different forms can be combined with the three forms of the
straight crank for new organs of motion, important in the construction of Sewing
Machines.
The drawings of the machines show only types of construction, which can be
recognized as examples of the application of the inclined crank in the connections
8.8 "the inclined crank fork" or "inclined crank lever" by themselves, and in the

page_text: It is
combination with the straight crank, in the different forms of the same.
evident that the applications of the inclined crank and its two connections is not
excluded from other constructions.
In figs. 1 and 2 is shown a sewing machine in section and plan, after taking
away the upper parts, and the sewing plate.
Fig. 12 is a plan of the crank and fork In this machine is applied the inclined
bent axle K. Around the bend K₁ of the same, is the slipper K³, made fast to its
parallel outside surfaces of the fork W on the axle W The axes of K K¹ and W
cut each other in one point. Now if K be turned W swings or oscillates in the
position W and Ws backwards and forwards, by which K' is held and led in
the fork W. On the under end of W are the arms S and T of which S moves tho
shuttle and T the stuff feeding rod T" both of which are moved by the oscillating
motion of W.
Figs. 1 and 1b show the application of the inclined crank fork to the inclined
crank lever. The slipper K is bound to the fork W¹ by means of the two turning
pivots w, and swings on them, whilst at the same time W swings round its axis.
In both arrangements the proper motion of the needle rod is produced by means of
a pin p situated in the disc P, running with its roller p' in the groove N¹ in the
needle rod N Figs. 10 and 11.
Fig. 3. is a section of a sewing machine whose plan is also shown in Fig. 2. In
it is applied the inclined crank eccentric in connection with the fork. The first
consists of a cylinder E Figs. 3. 14 and 15 which is drilled inclined and fixed upon
the driving axle K. Instead of this the axle K can be supplied with a similarly
formed boss. Around E lies the slipper E¹ Figs. 13 and 15 which is held and led
in the fork W₁ on the axle W.
The oscillations of W caused by the turning of K is used as before for the motion
of the shuttle and stuff feeder.
In Figs. 3 and 3b the slipper E' is secured to the fork W₁ by means of the two
turning pivots w, and thus an inclined crank lever is made out of an inclined crank
fork which works exactly alike turning on the axle W.
The pivot E', situated upon E¹ Figs. 3 and 15 (which is joined to the connecting
rod R by means of the universal joint and l¹ Fig. 16) moves the needle rod N.
This is fastened to a knee joint U U', whose arm U has the fixed turning point u
upon the frame of the machine whilst U is suitably connected by u¹ to the needle
rod. The stroke of U U¹ and the length of R is so regulated that N receives the
motion necessary for the stitch.
Figs. 4. 5 and 6 show the section and base plan (after taking away the upper
part) of two machines whose driving axle K lies underneath and by these the
inclined bent pin with the fork is brought into use.
Figs. 19 and 20 show the employment of the combination of an inclined angular
pin with the inclined pin of the crank Z which combination may be called a knee
pin The pin V Z may be either in a disc or in an arm as in Fig. 19 and 20
Instead of the angular pin, an eccentric can be used whereas in the inclined pin Z is
made fast and executes the functions of V. as shown below.
In figs. 4. 5. and 6 the knee pivot V Z is placed in the disc K¹ upon the axle K
To V. is fastened the connecting rod V¹ while round Z the slipper Z' which slides
in the fork h on the arm H and gives to this a swinging motion by the turning
of K On H is fastened the lug H with the stuff feeder I¹ while the shuttle rod S¹
on the arm S is connected to H.
Figs. 4 4 6 6 show the application of the crank lever inclined according to the
above described arrangement, in plan, section, and detail The pin Z rests in the
lever H³ which with the fork H encloses the crank boss H³. On this sit
the arms S. T. of the shuttle and stuff feeder rods S¹ and T¹ The other arrange-
ments of the machine are as follows:-In the machine shown in Figs. 4 and 5 the
connecting rod V₁ grips the lever M³ secured to the axle M upon whose front end
is situated the lever O Fig. 17 This is connected with the needle rod N by means
of joint rod O¹ and moves it in a suitable manner The machines shown in Figs. 6

page_text: and 5 are different from the others in this, that the needle rod is moved as in Fig. 3
by means of a knee joint U U₁ fastened moveably on the connecting rod R
connected by means of the angle lever L LJ.
In Figs. 7 and 8 is a section of a sewing machine and an under view of the
crank fork. Upon the driving axle K is the disc K' with knee pivot V. Z. The
inclined part of the same slides with the pulley z¹ in the curve disc H of the
lever H which is of the form shown in Fig. 10 in order to give the necessary
motion to the needle rod N which is connected to the other arm of H by means of
the joint piece N2 The straight crank pin V is connected with the axle I by
means of the connecting rod V₁ and the lever I' and I swings to and fro by the
turning of K and in a known manner moves the stuff feeder. 13 is upon I Fig. 18
and upon it is an inclined pin with slipper which slides in the fork G' of the
lever G, and supplies the reciprocating motion of G which is connected to the shuttle
in a suitable manner.
Figs. 7 and 8 show in elevation and plan the arrangement of the lever G*
instead of fork G The inclined part z of the pin is situated in the front part of
the same, while the behind end of G' fastens round the fork g on G for the motion
of the axle I and is connected with these by means of the turnable pins 9. G moves
round the pivot g¹ on the foot plate.
In the sewing machines shown in Fig. 9. the driving axle K lies underneath with
the inclined boss K₁ enclosed by the slipper K', this slides in the fork G Figs. 9
and 21 of the arm G. and sets this into a swinging motion, which is communicated
by its front end to the shuttle. The motion of the stuff feeder is caused by the
hereinbefore described means by the rotating axle K.
Figs. 9ª, 9b and 9° show in elevation plan and section the motion of the shuttle
from the cranked axle, by means of the crank lever G. G2 encloses in front the
boss K' and behind the forked lever G for the action of K which drives the shuttle
by its front end, and is joined moveably to G³ by the pin gl.
Fig. 9° shows that G turns with its pivot g¹ in a fork B. on the base plate of
the machine. For the motion of the needle rod N the circular eccentric V upon K
serves Fig. 9. which would here be taken as an example of the combination of au
inclined crank axle with the straight eccentric, or instead of the latter K can also
be provided with a straight boss at a suitable angle, which combination would
correspond to the angular needle pin.
The eccentric rod V' fastens on the lever M¹ by means of which it oscillates like
a pendulum This motion is conveyed to the needle rod N by means of the lever O
situated on the front end of M by means of the joint rod O¹.
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
1st The application of an inclined crank arm for changing the rotary motion into
a swinging motion.
"
2nd The application of the inclined crank arm, either as an "inclined crank
fork or an "inclined crank lever in the three forms of the inclined crank, in
connection with the three forms of the straight crank, for example as knee pin,
eccentric with inclined pin, axle with inclined and straight boss, etc, in order to
obtain out of the rotary motion of an axle K, two swinging motions, of which the
turning axle of the one is normal, and that of the other parallel to the axle.
3rd The construction of a sewing machine by which the motion of the needle rod
from the upper driving axle K follows by means of known means, while the motion
of the feeder and shuttle is effected by the inclined boss of the axle putting the
arm of the turning axle and arm connected to it for the shuttle, and feeder, into a
swinging motion,
4th The construction of a sewing machine whose upper axle is provided with an
inclined boss through which as before stated the shuttle and feeder are moved,
while the needle rod is moved by a pivot fixed to the slipper of the pin by means

page_text: of the rotary connecting rod, connected to it, and the knee joint fastened to the
first, and also to the head.
5th The construction of a sewing machine whose lower driving axle is provided
with an angular crank pin, of which the inclined part of the turning axle, together
with the arms fastened to it for the motion of the shuttle and feeder, put them into
a swinging motion, while the straight part of the connecting rod and lever, moves,
in a pendulum motion, an axle lying in the upper part, which motion is conveyed
by means of a lever and connecting rod to the needle rod.
6th The construction of a sewing machine with a lower driving axle, and angular
pivot, by means of which the shuttle and feeder are moved as before, while the
joint mentioned in paragraph 4 connected to the needle rod, is moved by means of
the connecting rod, and the angle lever of the straight part of the pivot.
7th The construction of a sewing machine, by means of the angular pivot moving
a lever and the needle rod connected to it by means of a joint; while the straight
pivot (by means of a connecting rod and lever) brings into a swinging motion the
under or lower axle, which is used as known for the feeder, while the shuttle is
moved by a lever connected to the shuttle rod, by means of an inclined pivot.
8th The construction of a sewing machine, whose lower driving axle has on the
front end the known means for the motion of the feeder while the inclined boss of
the axle, drives the shuttle with an arm and lever by means of the axle belonging
to it, and the straight circular excentric situated upon the axle with its rod fastened
on a lever situated on the upper axle, and this communicates a swinging motion,
by the rotation of the driving axle, which is conveyed to the needle rod by means
of a lever with joint piece situated on the front end.
Dated this 17th day of December 1885
LORENTZ ALBERT GROTH,
Agent for the Inventor.