Year: 1887

page_text: Date of Application, 13th Ju y, 1887
Complete Left, 12th Mar, 1888
Complete Accepted, 4th May, 1888
I, THEODOR VOGEL of Saalfeld of Saale, in the Empire of Germany, Manufacturer,
do hereby declare the nature of this invention to be as follows:-
Hook sewing machines, which finish one stitch with each revolution of the hook,
have a lever for presenting the thread for the loop which is drawn along under the
lower thread spool, and for drawing tight such loop. The rotary movement of the hook
has a varying rate of motion, in order that, of the period for forming the sowing
stitch, the time for leading the upper thread loop over the lower loop may be as short
as possible, while the rest of the time in the said period may be as long as possible in
order that owing to the comparatively large distance which must be traversed by that
end of the thread presenting lever which conducts the upper thread for the looping of
the thread, this end need not move with too great a speed. Excessive speed thereof.
is not only injurious to the upper thread, but also to produce such speed, the eccentric
moving the thread lever must have a very steep inclination causing concussion and
wear, of the parts. The longer the time available for drawing fast the loops the more
advantageous can be the shape of the eccentric for the movement of the thread
presenting lever, and the larger can be the stroke of the latter. The larger on the other
hand is the stroke of the lever, the larger may be the lower thread spool, so that
the problem of the employment of purchasable yarn rolls ready for use as under
thread spools depends for its final solution partly on the shortness of the time, in which
the upper thread loop can be conducted over the under thread loop before the drawing
fast of the stitch.
In the accompanying drawing a is the curve cylinder for moving the thread
presenting lever b; c shows the hook rotating with varying speed; before this hook
lies the under thread spool d in a casing placed over the same. This casing leans
with its back against the hook disc and is held in front by a ring e open above and
therefore hook-shaped. A projection of the casing catches into the opening of said
ring (Figs. 1 and 3) therefore the spool cannot participate in the rotation of the hook.
The ring e can be folded off the casing, in the hinge for removing the casing and
with it the spool from the machine. The novelty of this simple arrangement is, that

page_text: the under-thread spool does not lie with its centre in the axis of the hook axle as is
generally the case in hook machines. The spool is laterally displaced perpendicularly
to the plane in which lie the needle and the axis of the shaft of the hook, Figs. 1 and 3
towards that side from which the upper thread loop is lead upward by the hook.
This serves the purpose that the hook need not even perform one half rotation to
bring its thread loop beyond the centre of the under thread spool (Fig. 1). As soon
as the upper thread loop is led over this point, the drawing fast of the same can
commence; the thread lever b can therefore begin its stroke correspondingly earlier,
than would be possible, if the hook had previously to complete its half rotation. Thus
for the movement of said lever a further part of the period above that gained by the
greater primary speed of the hook is taken from the whole period of the formation of
the stitch.
The cam a for moving the lever may therefore be less steep, or the under thread
spool may be larger than heretofore.
The period of time for looping the upper thread round the under thread spool could
be still decreased by moving the spool towards the loop, therefore by laterally
forwarding the spool from the plane supposed to pass through the needle and the axis
of the hook; in this case a backward movement would be required after drawing fast
the loop, which however would necessitate complicated and expensive mechanisms,
which are unnecessary with the above described lateral resting position of the spool.
The improved machine comprises a second novelty viz:
The hinge of the folding ring e is situated on an arm g of the axle i. The latter
is rocked at each stroke of the machine, since it is connected by a second arm h,
bifurcated at its extremity, with an eccentric disc k on the hook-axle. The fork of
the lever embraces the eccentric disc k: With each full rotation of the hook
therefore the under thread spool also swings up and down, lead by the ring e, on the
hook disc. It ascends, when the cloth feed forwards the fabric to be sown, the
underthread being thereby caused to yield for being introduced into the stitch. When
however after each dipping of the needle, the upper thread loop has slipped over the
under thread spool until the commencement of its contraction, this spool swings
downwards and thereby draws its own thread fast in the stitch just forming.
To the drawing up of the upper thread corresponds a drawing down of the under-
thread, with the advantage, that the spool while it is looped by the 'under thread lies in
its highest position, the loop requires therefore a very short amount of thread for
itself, so that the stroke of the thread presenting lever may be made a little less, than
it would have to be if the spool were held at a normal height. It is necessary
therefor, that the hook c let loose the loop prior to the completion of its half course;
if, for this purpose it were obliged to complete a half course, there would be no
economy in length of loop.
1
T 1
1002

page_text: UUMIDELE
Improvements in Sewing Machines.
I THEODOR VOGEL of Saalfeld of Saale in the Empire of Germany, Manufacturer
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 that class of sewing machines known as hook sewing
machines and the following is a description of the invention as applied to those
in which a stitch is finished with each revolution of the hook and in which a take up
is provided for supplying the thread for the formation of a loop by the passage of the
hook and for tightening the loop to form a stitch.
In such machines the rotary movement of the hook has a varying velocity in order
that the period of time occupied in carrying the loop of the upper thread over the
under thread spool may be as short as possible, while the remaining period of time
for finishing the stitch may be as long as possible in order that, owing to the
comparatively large distance which must be traversed by the thread holding end
of the take up the speed of travel of the latter may be reduced as much as possible
and thus the inclination of the cam or eccentric operating the take up be as small as
possible, wear on the parts being less. It will also be understood, that the longer the
time allowable for drawing fast the loops, the larger can be the stroke of the take up
so that the loop drawn up may be larger and the lower thread spool can be increased
in sizo. The problem therefore of the employment of purchasable bobbins or reels
ready for use therefore depends for its solution on the shortness of the time during
which the upper thread loop can be carried over the under thread bobbin before the
drawing fast of the stitch.
Referring to the drawings filed with my provisional specification
Figs. 1 and 2 are sectional end and side elevations of parts of a sewing machine of
the class described the parts being in their position relative to the lowest position
of the take up b.
Figs. 3 and 4 are similar views of the parts in the positions they occupy during the
uppermost position of the take up.
Figs. 5 and 7 are sections on line C, D Figs. 2 and 6 respectively showing certain
parts during the lower and upper position of the take up.
Fig. 6 is an under plan view.
a is the cam for operating the take up b.
c is the hook and d the under thread shuttle the shuttle abuts against the face
of the hook on the one side and on the other side is supported by a circular plate e
open above as shown and therefore hook shaped. A projection on the shuttle engages
in the opening in said circular plate so that the shuttle does not participate in the
rotation of the hook. The circular plate e can be folded back about the hinge of for
removing the shuttle and spool from the machine. The novelty of this simple
arrangement is that the underthread shuttle does not lie with its centre in the axis of
the hook axle as is generally the case in this class of sewing machines.

page_text: The axis of the shuttle is displaced in a plane perpendicular to the plane in which
lie the needle and the axis of the shaft of the hook and towards that side on which the
upper thread loop is drawn downward by the hook.
This serves the purpose that the hook need not even perform one half rotation
to bring its thread loop beyond the centre of the under thread shuttle (Fig. 1). As
soon as the upper thread loop is carried over this point the drawing fast of the same
can commence; the take up b can therefore begin its stroke correspondingly earlier
han would be possible if the hook had previously to complete its half rotation.
Thus for the movement of said take up a further part of the period beyond that
gained by the greater primary speed of the hook is taken from the whole period
of the formation of the stitch.
The cam a for moving the take up may therefore be less steep or the under thread
huttle may be larger than heretofore.
The period of time for looping the upper thread round the under thread shuttle can
De still further decreased by moving the shuttle towards the loop, therefore by
aterally moving the shuttle from the plane in which lie the needle and the axis of the
nook, in this case a backward movement would be required after drawing fast the
loop which however would necessitate complicated and expensive mechanisms which
are unnecessary with the above described lateral resting position of the spool.
The improved machine comprises a second novelty videlicet. The binge f of the
folding ring e is situated on an arm g of the axle i.
The latter is rocked at each stroke of the machine since it is connected by a second
arm bifurcated at its extremity with an eccentric disc k on the hook axle.
The fork of the lever h embraces the eccentric disc k. With each full rotation of
the hook therefore the under thread shuttle also swings up and down carried by the
ring e.
It ascends when the cloth feed forwards the fabric to be sewn the under-
thread being thereby caused to yield for being introduced into the stitch. When
however after each dipping of the needle the upper thread loop has passed over
the underthread shuttle and during the commencement of its contraction of the loop
the shuttle moves downward and thereby draws its own thread fast in the stitch just
forming.
To the drawing up of the upper thread corresponds a drawing down of the
underthread with the advantage that the shuttle while the loop of the upper thread
passes about it lies in its highest position, the loop requires therefore a very short amount
of thread so that the stroke of the take up may be made a little less than it would
have to be if the shuttle were held at a normal height.
The hook is so constructed as to release the loop before the completion of a half
revolution.
The following is a description of the invention as applied to a hook sewing machine
in which the opening of the loop by the hook draws fast the previous loop and
in which the take up is therefore dispensed with.
Reference being made to the drawings filed with this specification
8
a device
is arranged laterally in connection with the lower thread shuttle by the use of which a
proportionately small circle is required for the travel for the hook. The shuttle
moves away from the catcher. If as shown in Figs. 1 and 7 the hook i moves from
below laterally up to the right the shuttle & has some little time before, moved to the
left and therefore makes room for the passing of the hook. When the hook moves
upward from the right Fig. 5 the shuttle descends, when the hook moves from above
laterally to the left Fig. 6 the shuttle deviates to the right and previous to the
downward movement of the book Fig. 4 the shuttle ascends.
The shuttle therefore always evades the hook so that the latter need not move
around the shuttle on a large circle but may circulate in a smaller circle than with
stationary shuttles. Therefore if thread loops of the usual size are made in the
upper thread in the improved arrangement larger shuttles and therefore larger
bobbins can be employed.
To effect this purpose the shuttle is given an up and down and also a to and fro
movement.

page_text: The above described shuttle movement is equivalent to a movement on a quad-
rangular track and this quadrangular movement corresponds to that performed by the
cloth feed of the sewing machine. The shuttle may therefore be so arranged
as to participate in the movement of the cloth feed and this is facilitated by placing
the shuttle carrier direct on the cloth feed.
The cloth feed lever a embraces with its bifurcated extremity a stationary pin b
from which it is held radially off by a spring c Fig. 9, the other extremity of the
lever a carries a slot through which passes an eccentric wrist pine at the end of
the lower shaft which revolves uniformly with the upper shaft / Fig. 8 parallel to
it. Upon the head of the eccentric pin e is situated the disc g centred with the shaftƒ
and having the hook i. On the revolution of the shaft f the cloth feed lover a follows
the movement of the pin e and, as one extremity of the slot embracing this pin
is pressed by the spring c against the pin e, Figs. 6 and 9, is displaced up and down
as well as to and fro in more or less quadrangular movement.
The plate k is screwed onto the cloth feed a by means of the screw n. Said plato
has an angularly curved slit into which catches the projection m on the edge of the
shuttle Figs. 2, 8 and 9, so as to cause the lattor to be suspended in this slit while tho
back thereof leans against the disc g Fig. 8 the shuttle being thereby secured in
the machine.
For the purpose of detaching the shuttle from the machine the plate k is adapted to
be turned downward round its fastening screw n Fig. 6. The shuttle sliding off the
disc g loses the support given to it thereby and falls freely out of the machine. To
introduce the shuttle into the machine its edge projection m is placed in the slit
in the plate k and the latter is turned around the pin n Fig. 7 so as to allow the
shuttle to regain its support on the disc g. Friction on the head of the screw n
suffices to secure the plate k in its position on the cloth shifter lever during sewing
but for this purpose also any suitable device such as spring bolt o Fig.
employed.
may be
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
1 claim is
1. In hook sewing machines having under thread take up, a shuttle, the contre of
which lies outside the plane of the needle and the axis of the hook towards that side
from which the hook draws the upper thread loop round the shuttle for the purpose
set forth.
2. The combination of a rotary hook, a shuttle whose centre lies laterally of the
axis of the hook and a plate e for support of said shuttle and arranged to reciprocate
substantially vertically for the purpose set forth.
3. The combination with a rotary hook having comparatively small circuit of
a shuttle having a rotary or quadrangular movement as and for the purpose set
forth.
4. The combination with a rotary hook having comparatively small circuit of
of a shuttle having a rotary or quadrangular movement as set forth and supported
directly or indirectly by the cloth feed bar substantially as set forth.
Dazu w day or
'000т поютт
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agents to Applicant.