Improvements in Sewing Machines.
Year: 1887

page_text: Date of Application, 10th Aug, 1887
Complete Left, 11th Oct., 1887
Complete Accepted, 11th Nov., 1887
Improvements in Sewing Machines.
I, SALLY ADOLF ROSENTHAL, of Prinzessinnenstr. 17 Berlin S., in the Empire
of Germany, Manufacturer do hereby declare the nature of this invention to be as
follows:-
My invention relates to sewing machines which are chiefly intended for children's
use, and in which, therefore, all the parts not absolutely necessary are dispensed with,
but which is nevertheless capable of producing a faultless-single thread chain stitch
adjustable in respect of its length.
The distinguishing features of my invention are the mechanism for guiding the
needle rod, and the arrangement for altering the length of the stitch.
The under plate of the inachine is formed as a clamp for fixing the machine to a
table; with this under plate is connected an upright plate which at its front part
furnishes a support for the sewing plate, and at its rear part which rises above the
sewing plate and is then bent forward, serves as a holder for the stuff presser. This
part of the stand is moreover bent at a right angle above in order to form a hold or
steady piece for the guide rod which latter is fixed at its lower end in the under
plate.
Upon the guide rod the needle arm slides up and down, carrying the needle in front
and provided at the rear with a journal to which the connecting rod is attached, the
other end of this rod embraces a bend of the shaft which is supported in the two side
walls of the upright plate. Upon a second bend of the shaft is arranged the handle by
which the machine is put in motion.
When turning the handle the needle arm is caused to work with an up and down
motion upon the guide rod. In order to prevent lateral vacillation of the needle, a
peculiar and very simple guide is provided for the needle arm. The latter is provided
for this purpose with a projecting edge which is guided in a notch cut in the rear edge
of the table. The needle will therefore always move up and down vertically and
exactly in a straight line without lateral vacillation as the rod and the slot form a safe
guide.

page_text: In the upper horizontal arm which is bent downwards in front the presser is held by
means of two screws which pass through elongated slots of the presser so that a slight
upward and downward displacement of the presser is permitted. A plate spring fixed
on the rear part of the arm acts upon the presser so that the stuff to be sewed, which
is placed between the table or sewing plate and the lower end of the presser which is
constructed in the form of a foot, is pressed. To put in stuff to be sewed, pressure is
exerted from below against that part of the presser upon which the spring rests.
The stuff feed consists of a flat plate which is so arranged that by means of a slot
and a screw on the rear side of the plate, a slight upward and downward motion
becomes possible. The feed protruding with its upper part through an opening of the
plate is here bent round again, and provided on its upper side with teeth which when
in the highest position are above the surface of the sewing plate but when in the
lowest position, they are below the said plate. Besides this up and-down motion the
stuff feed receives a to-and-fro motion from an excentric disc that is fixed upon
the main shaft. An elongated opening is formed in the feed in which the excentric
moves, and causes the up-and-down as well as the to-and-fro motion of the feed. As
is known single thread chain stitch machines are very liable especially at the beginning of
fresh seam,
to make false stitches and to cause the tearing of the thread. This is
chiefly owing to the stuff feed which is at first not able to advance the stuff as far as
is necessary. The latter defect is obviated by making the opening the stuff feed plate
only so large that a displacement. through a small distance say two millimetres, inust
necessarily take place, the stuff-feed can therefore never cause a mis-stitch.
lateral additional displacement beyond the small distance of two millimetres can be
changed by the opening being enlarged and it can also be adjusted more or less by
turning a lever pivoted on the upright plate to the right, whereby the excentric strikes
sooner or later against the right hand side of the opening, and the proper motion of
the feed accordingly takes place. A plate spring presses the feed back to the left, this
plate spring is fastened on the feed itself.
a
The
The main shaft carries in front of the stuff feed the known revolving hook for
single thread chain stitch machines.
Dated this 10th d
A
1007
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: 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 sewing machines in which all parts not absolutely necessary
are dispensed with, but which are designed to produce a perfect single thread chain
stitch adjustable in respect of its length.
"
This said invention comprises a novel arrangement for guiding. the needle rod,
and for altering the length of the stitch, and other improvements as hereinafter set.
forth.
The accompanying Drawings show how the said invention may be conveniently and
advantageously carried into practice.
Figure 1 is a side view of the machine.
Figure 2 is a front view.
Figure 3 is a back view.
Figure 4 is a section on the line a a Figure 1.
Figure 5 is a section on the lines y y Figure 1.
The bottom plate A of the machine is constructed so as to form a clamp A¹ suitable
for fixing the machine to a table; to this bottom plate A is connected an upright
plate B the front part of which B¹ furnishes a support for the sewing plate C, its rear
part B2, which rises above the sewing plate and is then bent forward, serves as a
holder for the presser D. This part of the stand, as shewn in Figures 2 and 3 is also
bent at a right angle at 62, to form a hold or steady piece for the guide rod E, the said
guide rod is fixed at its lower end in the bottom plate A.
Upon this guide rod E reciprocates the needle arm F, carrying the needle f in front
and having at the back a suitable journal f¹ which connects the said needle arm F by
means of the rod g with a crank g¹ upon the shaft H. The said shaft H is supported
in the two side walls of the upright plate B' B³ and has a handle H¹ upon a
continuation of the crank g' by which the machine is actuated.
Upon turning the handle H the needle arm is caused to work with a reciprocating
motion upon the guide rod E. To prevent any lateral motion or vibration of the
needle, the needle arm F is provided with a simple and novel arrangement of guide.
A projection is left upon the needle arm F which works in a notch or recess c
(Figure 5) provided in the back of the table C.
A small block c¹ is also fixed upon the guide rod E by means of a screw e or some
other suitable arrangement between the said guide rod E and the needle arm F thus
affording an additional guide to the needle arm F.
By this means the needle is forced to reciprocate exactly in a vertical line without
any lateral motion or vibration.
The
presser Dis fixed by means of two screws i, i, passing through elongated slots
on the upper horizontal arm B* which is bent over in front thus obtaining a slight

page_text: upward and downward adjustment of the presser D. A spring k fixed on the rear
part of the arm B2 acts upon the presser D thus compressing the material to be sewed,
which is placed between the table or sewing plate C and the lower end of the
presser D, which is constructed in the form of a foot. To insert the material to bo
sewed, that part of the presser D, upon which the spring rests, is pushed up from
beneath.
The feed L consists of a flat plate. (Figure 4) arranged to work at one end by
means of a slot upon a stud or pin fixed upon the rear side of the plate B' in such
a manner as to permit a slight upward and downward movement. The upper part of
this feed is provided with teeth m and protrudes slightly through an opening left for
that purpose in the sewing plate C when at its highest position, but when at its lowest
position, it is below the feed plate C. Besides this vertical motion the feed is also
supplied with a horizontal or lateral motion by means of an excentric o fixed upon the
main shaft H. In the feed L is an elongated opening p left in front of the feed L in
which the said excèntric moves on one side thus imparting a vertical and a horizontal
or lateral motion the forward motion being obtained by means of the spring s fastened
in the feed itself. Single thread chain stitch machines are very liable, especially when
beginning a seam, to make false stitches and to break the thread. The chief cause of
this is the feed, not being able to advance the material to be sewn at first as far as
necessary. To obviate this defect, the opening pin the feed plate L is so arranged as
only to allow a very small displacement say 2 millimetres; the feed therefore can never
cause a miss-stitch. Any-additional lateral motion beyond two millimetres is obtained
by enlarging the opening and more or less adjustment can also be obtained by
turning the lever pivoted to the upright plate to the right, causing the excentric o
to strike sooner or later against the right hand side of the opening, thus regulating
the motion of the feed.
The main shaft H carries in front of the feed a common revolving hook as generally
used on single thread chain stitch sewing machines.
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 :-
First. The improved means for guiding the needle armi F comprising the
projection working in the notch or recess c of the work plate C with or without the
block or guide piece c¹ all substantially as described.
Second. The combination of the feed plate L the eccentric o working in the hole or
recess p in the said plate and the spring's with or without the lever r all substantially
as, and for the purposes, set forth.
Third. The combination of the feed plate having the slot and the pin or screw l¹
and the eccentric o substantially as set forth.
Fourth. The improved sewing-machine consisting of the parts constructed and
combined substantially as described with reference to the accompanying drawing.
Dated this 10th day of October 1887
SALLY ADOLF ROSENTHAL.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.