Year: 1886

page_text: Date of Application, 2nd Sept., 1886.
Complete Left, 1st June, 1887.
Complete Accepted, 5th July, 1887.
1, JOHANN LUDWIG LÜDERS, of 63 Cornhill, in the City of London, Merchant, do
hereby declare the nature of this invention to be as follows:-
My invention relates to sewing machines and is designed to simplify the construction
and cheapen the manufacture of such machines.
An important feature of my said invention is the provision of means for facilitating
the introduction of the shuttle which carries the under-thread, into its place in the
machine and the removal of the said shuttle therefrom. For this purpose, I arrange
the shaft which operates the shuttle to slide longitudinally in its bearings in the lower
part of the frame, and I provide a spring for holding the said shaft in its operative
position whilst permitting its movement, when desired, to release the shuttle.
My said invention, moreover, comprises improvements relating to the means for
operating the feed-bar and the means for connecting the shuttle-operating shaft with
the main shaft, and various other improvements all hereinafter set forth.
My said invention is conveniently and advantageously carried into practice as
follows, that is to say :-I provide a C-shaped bracket or frame, in the upper part of
which the main shaft is fitted to rotate in suitable bearings. In the lower part of the
said bracket or frame, beneath the work-plate, a rock-shaft is fitted in suitable
bearings with a capability of axial movement therein. On the front end of this shaft
is fixed a hooked arm or shuttle-carrier. The shuttle is placed between this carrier
and a plate extending downwards from the work-plate at right angles thereto. A
spiral spring is placed upon the said rock-shaft between a fixed collar thereon and a
shoulder on the aforesaid bracket or frame.
A small fly-wheel is fixed upon the main shaft and is provided with a crank-pin on
which is fixed a handle for rotating the said shaft. This crank pin is coupled, by
means of a connecting rod or link, to an arm fixed upon the aforesaid rock-shaft,
whereby oscillating motion is imparted to the said rock-shaft, in the rotation of the
main shaft. The said connecting rod is so fitted on the said crank-pin that it is free
to slide to and fro thereon to permit the axial movement of the rock-shaft for the

page_text: purpose of releasing the shuttle and allowing it to fall from the machine. By means
of the said rock-shaft, the shuttle is moved to and fro across the path of the needle.
The needle-bar is fitted to slide up and down in the said bracket or frame and is
operated by the pin of a disc-crank fixed on the end of the main shaft, which pin
works in a peculiarly-shaped groove or slot in the said needle-bar. The feed bar is
also fitted to slide up and down in the said bracket or frame. A protecting plate or
cover is secured to the said frame to enclose and protect the mechanism for imparting
motion from the main shaft to the needle-bar and feed-bar. This plate or cover also
serves as a guide for the said bars. The feed-bar is moved up and down by means of
a pin or stud fixed in the said disc-crank. The requisite oscillating motion is, more-
over, imparted to the said feed-bar by this disc-crank, the said bar being kept against
the said crank by a spring. An adjusting screw is provided for regulating the length
of the stitches and a lever for raising and lowering the feed-bar.
A bent lever is pivotted upon a pin or stud fixed in the aforesaid protecting plate or
cover for taking up the slack of the thread during the upward movement of the
needle. This lever is operated by means of a pin or stud fixed in the needle-bar and
projecting through a slot in the said plate or cover and by means of a spring provided
for the purpose.
The winder for the bobbins is carried by an arm pivotted to the said bracket or
frame ; a spring is connected at one end with the said arm and is so arranged that it
may be attached at its other end to one or other of two pins or hooks fixed in the said
bracket or frame, so that it will hold the said arm either in its operative position or in
such a position that it does not obstruct the working of the machine.
The construction of the said machine may be somewhat modified without departing
from the nature of my invention.
Dated this 2nd day of September 1886.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.

page_text: I, JOHANN LUDWIG LÜDERS, of 63 Cornhill, in the City of London, Merchant, 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:-
My invention relates to sewing-machines and is chiefly designed to provide for
facilitating the introduction of the shuttle into its place in the machine and its
removal therefrom, and for enclosing and protecting the mechanism whereby notion
is imparted from the main shaft to the needle-bar and feed-bar.
An important feature of my said invention is the employment of an arm or shuttle-
carrier fixed upon a rock-shaft which is free to slide longitudinally in its bearings,
and is provided with a spring which holds the said shaft in its operative position
whilst permitting its movement, as hereinafter described, for the purpose of releasing
the shuttle.
My said invention, moreover, comprises various other improvements hereinafter
set forth.
In the accompanying drawings, I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figure 1 is a vertical longitudinal central section of one form of my improved
machine.
Figure 2 is a transverse section on the line x, x, Figure 1.
Figure 3 is a transverse section on the line a¹, a, Figure 1.
Like letters indicate corresponding parts throughout the drawings.
A is the work-plate of the machine, which is supported upon a base A', and which
has a bent arm or goose-neck B formed thereon or firmly attached thereto. C is the
driving wheel which is fitted to rotate upon a pin or stud C₁ fixed in the arm B. This
wheel is geared with a pinion D¹ fixed on the shaft D, which imparts motion to the
needle-bar E and feed-bar F as hereinafter described.
G is a rock-shaft which is fitted in bearings in brackets A², A³ extending down-
ward from the work-plate A, and which is free to be moved endwise or longitudinally
in the said bearings. On this shaft is fixed an arm or shuttle-carrier H. The
shuttle 1 is placed in a groove or recess in this carrier and is held therein by the
bracket A. A spiral spring K is placed upon the said rock-shaft between a fixed
collar or head G₁ thereon and a boss or projection A* on the bracket A2; another
spiral spring K is placed upon the said shaft between a pin or stud G2 fixed therein
and the bracket A³.
The rock-shaft G has fixed thereon a forked arm L which engages with a pin or
stud M' fixed in the long arm of a lever M. This lever is pivotted upon the pin
or stud C and its short arm is connected with an excentric N fixed on the shaft D, so
that oscillating motion will be imparted to the rock-shaft G by the said excentric in
the rotation of the said shaft. The pin or stud M¹ is made of such length that it will
remain in engagement with the forked arm L notwithstanding the end wise movement
of the rock-shaft.
The springs K, K', under normal conditions, hold the shaft G in the position shown
n Figure 1, so that the shuttle I is retained in place and will be operated by the

page_text: oscillating movement of the said shaft. To remove the shuttle from the machine, it is
only necessary to push the said rock-shaft in the direction indicated by the arrow in
Figure 1, thereby compressing the springs K, K' and moving the arm or carrier H
away from the bracket A² so that the shuttle is released and falls from the said
carrier.
The needle-bar E is fitted to slide up and down as usual in the head B¹ at the end
of the arm B, and is operated by the pin O' of a disc-crank O fixed on the shaft D,
which pin is provided with an antifriction roller and works in a peculiarly shaped
groove or slot P¹ in a piece P firmly secured to the needle-bar.
The feed-bar F is also fitted to slide up and down in the said head B' and is pivotted
upon a pin F fixed in the said head and passing through a slot F2 in the feed bar.
The said-bar is provided with an arm F³ which extends at about right angles thereto
so that the requisite up and down movement will be imparted to it, in the rotation of
the main shaft D, by means of an excentric Q fixed on the said shaft. A spring R is
attached at one end to the feed-bar F and at its other end to the head B¹. This
spring tends to draw the said feed-bar downward and thus press its lower end against
the work. A cam S is formed or fixed on the back of the disc-crank O and acts in
combination with the spring R to impart oscillitating motion to the said feed-bar.
T is the lever for putting the feed-bar in or out of action. U is an adjusting screw
for limiting the movement of the feed-bar and thus regulating the feed.
The requisite motion is imparted to the said feed-bar as follows, that is to say :-In
each revolution of the shaft D, the said feed-bar is moved outward by the cam S to
feed the work to the needle, it is then raised by the cam Q and then moved inward
and downward by means of the spring R.
B2 is a protecting plate or cover which is secured by means of screws or otherwise
to the head B'. This plate or cover encloses the mechanism for imparting motion
from the main shaft D to the needle-bar E and feed-bar F. The said plate or cover,
moreover, serves to guide the said feed-bar in its up and down movement.
The construction of the said machine may be somewhat modified, if desired, without
departing from the nature of my said invention. For instance, the rock-shaft, instead
of being connected with a lever operated by an excentric as above described, is some-
times connected by a rod or link with a pin or stud fixed in the wheel C¹; or other
means are provided for operating the said rock-shaft.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I wish it understood that I claim :-
First. The employment, in a sewing machine, of a shuttle-carrier which is fixed
upon a rock-shaft and is so constructed and arranged that the shuttle may be released
by endwise movement of the said shaft as above specified.
Second. The combination of parts comprising the shuttle-carrier, the rock shaft
provided with one or more springs and the lever connected with an arm on the said
shaft and arranged to be operated by an eccentric on the main shaft, all substantially
as, and for the purposes, set forth.
Third. The combination, with the head B, of the protecting plate or cover B2,
substantially as, and for the purposes, set forth.
Fourth. The improved sewing-machine consisting of the parts constructed and
combined substantially as described with reference to the accompanying drawings
and operating as above specified.