MENTS IN WHIP-STITCH SEWING MACHINES
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said Carl Necker and Richard
Horstmann at the Office of the Commissioners of Patents on the 22nd
November 1880.
7
TIT
CARL NECKER and RICHARD HORSTMANN, both of Berlin, Germany. "IMPROVE
MENTS IN WHIP-STITCH SEWING MACHINES."
Our Invention relates to improvements in the construction of a shuttle sewing-
machine, patented to Carl Necker, under No. 814; February 28th 1877, for the
United Kingdom, and the object of our Invention is, to obtain the so-called
whip-stitch (round steam) by adding a new mechanism to the construction
described and shown in the aforesaid patent, by which only the ordinary flat seam
had been obtained.
The said mechanism, which is to work in combination with the formerly patented
construction, consists of a thread-catcher working in front of the shuttle-race, and
giving to the shuttle-thread such movements as are required for obtaining the
whip-stitch in combination with the needle-thread.
The said catcher receives movement in three different directions; a sliding move-
ment towards and from the shuttle râce, à vertical up and down movement, and
swinging movement in the horizontal plane.
'
This triple movement is derived by a peculiar device, consisting of two eccentric
sheaves mounted upon the driving axis of the machine, and bearing against two
arms which are combined one to another and with the said thread catcher. The
said two arms, one of which we call the sliding bar the other the rocking-arm are
connected by a bolt which turns in the sliding bar and allows a swinging movement
to the rocking arm; the catcher is connected to the latter.

page_text: The operation of the catcher to perform the whip-stitch in combination with
the needle thread is the following:-The main shaft is turning to the right, and
one of the said eccentric sheaves mounted upon the same imparts a forward
movement to the driving bar, and accordingly to the catcher, which thereby is
caused to catch the tight shuttle thread, at the same time the catcher receives by 5
means of the other eccentric sheave, and by the peculiar shape of the same, a
downward movement and also a swinging movement to the right by which the
shuttle-thread is carried from the left to the right side of the needle. The needle
now pierces the leather or fabrics on the left side of the shuttle thread. At this
time the catcher drops the shuttle thread, and while the shuttle moves to the right 1
the said thread forms a second loop upon the fabrics, which loop now will be caught
and drawn by the returning needle-thread. The needle now being out the shuttle
again moves to the left, and the same operation is going on as before described.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Carl Necker and Richard Horstmann in the Great Seal Patent
Office on the 19th May 1881.
CARL NECKER and RICHARD HORSTMANN, of Berlin, Germany.
IN WHIP-STITCH SEWING-MACHINES."
"IMPROVEMENTS
Our Invention relates to improvements in the construction of a shuttle-sewing-
machine patented to Carl Necker, under No. 814, February 28th, 1877, for the
United Kingdom, and the object of our Invention is to obtain the so-called
whip-stitch (round-seam) by adding a new mechanism to the construction described
and shown in the aforesaid patent, by which only the ordinary flat seam had been
obtained.
The said mechanism, which is to work in combination with the formerly patented
construction, consists of a thread-catcher working in front of the shuttle-race and
imparting to the shuttle-thread such movements as are required for obtaining the
whip-stitch in combination with the neadle-thread.
In Sheet 1 of the accompanying Drawings, Figure 1 is a side view of the
complete machine with the cover-plate removed.
Fig. 2 is a plan of the same machine; Figure 3 shows the form of the whip-stitch
to be sewn by means of the combination, which we claim as our Invention.
To the said thread catcher e motion is imparted in three different directions; a
sliding motion towards and from the shuttle-race, a vertical up-and-down-motion,
and a swinging motion in the horizontal plane.
This triple motion is derived from the following device :-
Upon the main-shaft or driving axis A of the machine two eccentric sheaves a
and b are secured, the former a imparting to the catcher e the sliding motion, the
latter sheave 6 producing by its shape the two other motions before mentioned,
"

page_text: The sheave a works in connection with the slide-bar c, and the sheave 6 bears upon
the rocking arm d to which the catcher e is connected.
The slide bar c is working in a slot of a bearing f secured to the frame, a bolt g
vertically extends through the said slide-bar c, the said bolt forms a cone within
the bar c and has a screw-thread cut upon the part projecting below. A nut is
screwed upon the said threaded end so as to allow the bolt g to turn within the
bar c.
The projecting top of the bolt g is traversed by a pin which allows a horizontal
swinging motion to the arm d which rests upon the said pin. To the front part of
the arm d the catcher e is connected by a set-screw.
The operation of the catcher e to perform the whip-stich, as shown in Figure 3,
in combination with the needle is the following:-
The main-shaft A is turning to the right, and the sheave a first imparts a forward
motion to the catcher e so that the latter catches the tight shuttle-thread, at the
same time the catcher e receives by means of the sheave b a downward motion, and
also a swinging motion to the right, by which the shuttle thread is carried from the left
to the right side of the needle. The needle now pierces the leather or fabric on the
left side of the shuttle-thread; at this time the catcher e drops the shuttle-thread,
and while the shuttle is moving to the right, the said thread forms with the
needle-thread a second loop upon the fabric, which loop now will be catched and
drawn on the back by the returning needle-thread. The needle now being out, the
shuttle moves again to the left, and the same operation is going on as before
described.
Our Invention also relates to various modifications which may be usefully applied
to the working mechanism of the machine. These modifications are shown upon
Sheet II of the Drawings. Figure I being a side elevation, the side-plate of the
machine being removed; Figure II a front elevation of the same, the front-plate,
nipper, and feeder being removed; Figure III a plan of the machine, the top-plate
being removed.
'
In the casing A of the machine bearings are provided for the main-shaft B. Upon
the said main-shaft five slotted sheaves C, D, E, F, G, are secured, by which sheaves
motion is imparted to the various working parts.
The sheave C serves to impart motion to the shuttle-driver by means of the
oscillating arm H, provided with a toothed arch and a pinion J. In this
arrangement the vertical position of the oscillating arm H, with the toothed arch,
is new and original. The said arm H is secured upon the shaft K turning on centres,
and motion is imparted to the same by the little friction-roller h' secured to the
arm H, and working in the slot of the sheave C, as shown in Figure I.
The sheave D serves to drive the slide M which carries the needle, and which is
guided as usual in the top-plate of the machine. Motion is transferred from the
sheave D to the slide M by means of the lever L swinging on its fulcrum at 1.
The swinging motion of the lever L is converted into a straight to-and-fro motion
of the slide M by means of a friction-roller working with its sloping top in a
slot m¹ of a neck m formed to the slide M.
The sheave E in connection with the sheave F serves to drive the thread-
catcher N, which receives by the sheave F a double motion. The third oscillating
motion is imparted to the catcher N by means of the swinging lever P secured upon
the shaft O, which turns on centres like the shaft K. The lever P is provided with
a friction roller p, working in a slot of the sheave E.
The sheave G serves to work the new and original thread-tightener which forms
part of our Invention. This thread-tightener consists of the double armed lever Q,
the draw-bar R, support S, and double armed lever T. The lever Q is provided
with a friction-roller q' working in a slot of the sheave G; the upper end of the
lever Qis forked. The double-armed lever T has its fulcrum at s in the support S,
its upper end is connected to the draw-bar R, the lower end is provided with an
ear.

page_text: The operation of the said thread-tightener is going on in the following manner:
As soon as the thread-catcher N. is advanced and has taken hold of the shuttle-
thread in order to move the same downwards and to carry it to the right side of
the needle, so that the latter may enter the fabric above the needle and form a
second loop, it is of importance that in the same moment, the needle-thread be
tightened, in order that the loop formed on the back of the fabric around the
shuttle-thread be well and tightly drawn. This effect is attained by means of the
slot in the sheave G in combination with the roller q' and lever Q, connected to
the draw-bar R. The double armed lever T thereby is acted upon in a manner
that its lower end is drawn back in the same moment when the slide M is
withdrawn, and the needle consequently comes out of the fabric. Accordingly the
needle-thread passed through the ear in the lower end of the lever T will be
tightened by the return motion of the said lever T. As soon as the slide M again
advances, i.e., when the needle again enters the fabric, the lower end of the
lever T will also advance in the same direction.
Having thus fully described the nature of our Invention and the manner of
performing the same, we would have it understood that the details of the machine
herein before described and shown in the Drawings may be considerably varied,
but what we claim is,―
First. In a shuttle-sewing machine for sewing gloves; the combination of the
original construction described in Patent No. 814, 1877, with the mechanism
consisting of the sheaves a and b, the slide bar c, the rocking-arm d, and the
catcher e, for the purpose of forming the whip-stitch or round seam, as described
and shown in Sheet I of the Drawings.
Second. In a shuttle-sewing machine for sewing gloves, the mechanism for driving
the shuttle, consisting of the sheave C secured upon the main-shaft in combination
with the swinging lever H arranged upon the shaft K, and provided with the
toothed arc h, roller h¹, and pinion J¹:
Third. In a shuttle-sewing machine for sewing gloves, the mechanism for driving
the slide M, which carries the needle consisting of the sheave D, and the lever L
swinging on its fulcrum at 1, and provided with a friction-roller 7 working in a
slot m' of the slide M.
Fourth. In a shuttle-sewing machine for sewing gloves, the mechanism for
driving the thread-catcher N, consisting of the sheaves E and F, & the swinging
lever P arranged upon the shaft O, the said lever P receiving a double motion
from the sheave F or third swinging motion being imparted to it by the
sheave E.
Fifth. In a shuttle-sewing machine for sewing gloves, the mechanism for
operating the thread tightener, consisting of the sheave G in combination with the
double-armed lever Q.
Sixth. The construction of the thread-tightener, consisting of the double-armed
lever Qswinging on its fulcrum q, the draw-bar R, the support S, and the double-
armed lever T.
In witness whereof, we, the said Carl Necker and Richard Horstmann, have
hereunto set our hands and seals, this Fourteenth day of May, in the year
of our Lord One thousand eight hundred and eighty one.