Year: 1888

page_text: Date of Application, 30th June, 1888
Complete Specification Left, 22nd Aug., 1888
Complete Specification Accepted, 5th Oct., 1888
I, LOUIS PRANGE of 3b Louisenufer, Berlin, Germany, Engineer, lo hereby declare
the nature of this invention to be as follows:-
This invention relates to sewing machines.
One of the advantages of the improved sewing machines constructed according to
the said invention, as compared with the hand sewing machines heretofore used, is,
that the shuttle is adapted to receive a much larger quantity of thread, than has hereto-
fore been practicable with machines of the same size. Moreover the lower thread can
be conducted with great facility from the bobbin in the shuttle, by reason of the
special mode of guiding the same and the feed plate is arranged to be actuated
indirectly from the driving shaft through the medium of intermediate levers for the
purpose of enabling the large driving wheel to be turned to the right and the feed
plate to be simultaneously moved in the same direction as hitherto without unduly
increasing the size of the driving wheel.
In this improved machine motion is imparted to two toothed wheels and their
shafts by means of a crank or the like which is firmly connected with a toothed
wheel.
A tappet or driver on the needle bar engages with a groove formed in a heart-
shaped piece and as the upper shaft rotates, causes the needle bar to move up
and down.
The cloth-presser is raised and lowered through the medium of a handle.
The needle thread passes from the bobbin over a tension, next through guides
arranged at the upper and lower parts of the arm of the machine, and then through
the guide in the take up lever and another guide at the lower part of the said arm, to
the eye of the needle.
The driving mechanism which causes the shuttle and feed plate to be operated
is as follows.
Upon the lower shaft is arranged within a head plate a collar with a lifting-cam
secured thereon. This lifting cam is adapted to turn in a circular opening of a disc

page_text: or plate so that an up and down movement is imparted to the latter. A two armed
lover is moved by the said lifting cam in such a manner that when the lower arm
simply moves to and fro, or is caused to return to its normal position by the spring,
the upper arm causes the disc or plate together with the fead plate rivetted theron to
move to and fro. The length of the stitch is regulated by a lover. The parts herein-
before described are all placed horween the head and front plate and the support for
the sewing plate or table which support extends upward from the lower part of the
frame.
The mechanism placed upon the same shaft outside the aforesaid front plate is
designed to operate the shuttle. The movement of this circular shuttle which is
supported in a bearing fitted to oscillate upon a pivot at its lower end is affected by
means of a pin which is arranged excentrically upon a disc on the lower shaft and
moving with it in a slit provided in the lower part of the hearing, causes the latter to
Oscillate through about a quarter of a revolution.
In the improved sewing machine the formation of the stitch is effected in
the same manner as in other machines having circular shuttles. The construe-
tion of the easing for the thread bobbin is such that the thrand passes from the
bobbin first through a simple slit formed in the edge of the said casing and then
directly below a spring which serves as a tension.
The winding device for the thread of the shuttle simply consists of a lever which is
pivoted to the machine frame and kept in its normal position by a spring. At the
end of this lever is supported the transverse shaft which carries on one side
a small wheel provided with an india-rubber rim and set in rapid rotation by the
fly wheel, and on the other side the shaft on which the bobbin for the shuttle is
placed.
S DOL
P
1002
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: in an opening of the plate a capable of sliding around a journal n² by means of a
slot. Upon the platen is fixed the feed plate the teeth of which extend through
the table of the sowing-machine with a pin s of the plato n ongages the double-armed
lever o pivoted upon the pin o' and the rear side of which is provided with a plate
spring. Against this spring bears the stitch-guide lever which can be turned
upon the pin u on the plate. The screw provided with a broad head serves to
prevent the plate a being lifted off.
n
The pin n can also be arranged on the right hand side, Figuro 3, of the plate n,
tho action is not different, but the scrow can in this manner be dispensed with,
because the pin n² can be provided with a broad head and thus provent the plato n
buing lifted from the plate
When the shaft d' is turned, the cam m will only lift the plate whilst a small
spring will always tend to press it down, the cam m, owing to the wide oponing in
the platen, is however not capable of moving the latter to and fro this being
exclusively effected by the lever o, as the cam in its rotation also strikes the lower
arm of this lever o, the upper arm of the latter acting upon the plate n, through the
medinm of the pins this plate, and at the same time the feed plate q, is caused to
make a transverse movement which takes place in the opposite direction to that of the
lower arm of the lever n. The object of this arrangement is that despite the rotation
of the shaft to the left hand side (shown in figure 3) the feud plate 7, shall be able to
perform the displacement of the fabric in the direction of the arrow, which in the
sewing machines heretofore made can only be obtained by the cam m displacing the
platen directly in that direction, and for this purpose the shaft was obliged to turn
in the opposite direction.
This would however have necessitated the provision of innor teeth on the hand-
wheel a in order to engage with the teeth c, d from the outside if the hand-wheel was
to be turned to the right hand side as is necessary. By the inner tooth of the
hand wheel the latter would howevor have become very large which is entirely obvinted
in this arrangement.
The stitch guide u limits in the known manner the inovoment of the lever o in
order to enable the latter to strike as gently as possible against the lever 1, the spring
is arranged upon the back of the lever o.
The parts herein before described are all placed between the head plate and a
standard for the sewing table tr, extending upwards from the lower part of the
frame.
The mechanism arranged upon the shaft d' outside the head plate is designed to
effect the movement of the shuttle. The movement of the circular shuttle 6, figure 2
which rests in a bearing 7 capable of heing turned like a hinge, is effected by the
rotary movement of the pin 9 secured eccentrically upon the disc 8 and which slides in
the slot. 10 in the arm 11 that is adapted to turn upon the pin 12.
:
By the peculiar shape of the slot 10, the arm 11, and with it the shuttle 6, receives
such a motion as is most suitable for catching the thread-loop and for sewing
generally. For the purpose of readily removing the shuttle 6 from the shuttle
holder 7, the following arrangement has been made. The shuttle holder 7 is fixed to
two arms 7' 7' which can oscillate upon a pin 13 supported in two lugs 11' of the arm 11.
The pin 13 has just below its milled head a small eccentric pin 14 which falls into
a hole in the right-hand lug 11' and thereby prevents the pin 13 from turning. A
spring 13 between the two lugs 11' always presses the loft-hand shuttle holder arm 71
against the left hand lug 11. A spring 7" extending from the left hand shuttlo
holder arm 7 always presses the shuttle against the front surface of the plate. If
the shuttle 6 is to be removed the pin 13 is pushod by its head to the right hand side
until the pin 14 leaves its hole and the head 18 is now turned to the front whereby
also the shuttle holders with the shuttle are caused to puss' to such a position that the
shuttle can be conveniently reinoval.
This arrangement for removing the shuttle can also be used in cases where instead!
of the circular shuttle the well known long shuttle is employed. In this case only the
shape of the shuttle holder is changed, but the pin 18 with the eccentric pin 14

page_text: remains. One of the two arms 7', for example that on the left hand side, can be
dispensed with; the spring for holding the shuttle can also be arranged in any other
suitable manner than that represented.
The formation of the stitch in this machine is effected in the same manner as in the
known shuttle machines.
The circular shuttle, represented separately in figures 5 to 7, differs from others by
its special size. The mode of threading also differs from that hitherto adopted, and is
much simplified. From the bobbin of the shuttle which is shown separately in
Figure 7 and which is placed with its hollow axis 15 upon the journal 16 of the
shuttle 6, the thread 17 passes first through the oblique slot 18 in the outer wall of
the shuttle below the spring 19 to the front hole 20 of the latter. The small screws
with which the spring 19 is fixed upon the shuttle can be tightened more or less,
thereby regulating the tension of the thread.
The threading is by this arrangement rendered very easy, it being merely necessary
to introduce the thread 17 from the bobbin into the two slots 18 and 20, the thread
passing of itself below the spring 19.
The shuttle thread winding mechanism comprises a lever 21 pivotted to the frame
of the machine, figure 4, and which is kept in its two positions by a spring 22. At
the end of the lever is the transverse axis 23 which carries on one side the small
wheel 24 provided with an india-rubber crown and adapted to be set in rapid rotation
by the fly wheel, and on the other side the shaft 25 designed to receive the shuttle
thread roller.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
First. A sewing machine in which the feed plate g is displaced laterally by the
cam m through the medium of a double lever o. Whilst the lifting of the said feed-
plate is effected directly by the cam m, for the purpose of obtaining a displacement
of the transporter in the opposite direction to that of rotary movement of the cam
shaft, and thereby obviating the inner teeth on the main driving wheel a.
Second. The shuttle holder 7 which can be turned upon the pin 13 and adjustod
through the medium of the small pin 14, this holder permitting the shuttle to be
conveniently and rapidly removed.
Third. A circular shuttle 6, in the side wall of which is formed a slot 18, and upon
which a tension spring 19 having a hole 20 is secured, for the purpose of enabling
the rapid threading of the lower thread 17 from the bobbin 15 through the slots 18
and 20 as above described.
Dated this 22nd day of August 1888