Improvements in Book-stitching and like Machines.
Year: 1899

page_text: Date of Application, 11th Feb., 1899
Complete Specification Left, 30th Oct., 1899-Accepted, 2nd Dec.,
1899
Improvements in Book-stitching and like Machines.
I, CARL ERNST PREUSSE, Zweinaundorfer Strasse, of Leipzig-Anger-Crottendorf.
in the Kingdom of Saxony, German Empire, Manufacturer, do hereby declare
the nature of this invention to be as follows:-
This invention relates to an improvement in devices for stitching paper and
has for its object to provide a mechanism by means of which a safety knot in
the stitching thread is effected in simple manner. My invention essentially
consists of a pair of tongs moved forward and backward by any suitable propulsion
mechanism. This pair of tongs passes through the loops formed by the thread
after it is pushed through the paper by means of the usually employed stitching
needles.
Before it reaches the last loop it opens somewhat to close again immediately
afterwards, thereby catching the free extremity of the thread. If now the pair
of tongs is withdrawn, the thread is drawn through the loops and a safety knot is
effected.
My invention will be the better understood with reference to the accompanying
drawing, in which similar letters denote similar parts throughout the different
views, and in which:
Figure 1 shows a section through a sheet of paper to be stitched and my
mechanism before entering the loops.
Figure 2 is a section through the same, the pair of tongs traversing the loops.
Figure 3 shows a corresponding section in the moment where the pair of tongs
is withdrawn in order to effect the knot.
Figures 1, 2 and 3* illustrate the plan views of the corresponding Figures 1,
2 & 3
Figure 4 illustrates a detail elevation of my mechanism, the open position of
the tongs being represented in dotted lines.
Figure 5 is a section of the same.
Figure 6 illustrates the formation of the knot.
Figure 7 illustrates a knot when closed.
a b c.
The paper to be stitched is placed upon the table f. Three stitching needles
push in known manner the stitching thread through the paper, thereby forming
after withdrawal three loops
The first stitching needle is pushed lower
down than the two following, thus a greater loop will be formed. The lowest
extremity of this greater loop is turned upwards by any suitable mechanism,
so as to form a double loop as shown in the drawing (Figures 1-3).
Small tubes h h¹ are located underneath the table upon which the paper is
stitched, in such a manner, that the stitching needles when descending and
forming the loops b and c, press the thread into these tubes h and h¹.
The pair of tongs, which I employ in my construction, consists of two
legs which generally are closed but automatically open somewhat before they
reach the third loop c. This is effected by a suitable cam m (Fig. 5). When the
pair of tongs is open the free extremity of the thread will be caught and kept

page_text: within the legs when the same close again. The upper leg of this pair of
tongs is provided with an elastic nose g which has the purpose to push against
the projections and of the tubes h and h¹, thereby effecting a revolution of
the tubes. When the thread is pushed into the paper, the loops will lie in the
same direction as the pair of tongs, but they will be turned somewhat when the
elastic nose g of the upper leg d¹ presses against them.
0
When now, the pair of tongs has passed through the double-loop a, the nose g
pushes against the projection and turns the same round 90° Thereby the
loop of the tube will effect the same rotation and the pair of tongs is allowed
to pass through the loop b. The same will be the case with the third loop c.
Before reaching the third loop the lower leg of the pair of tongs will open and
immediately afterwards close again thereby catching the free extremity of the
thread. When now a backward movement is given to the pair of tongs, by any
suitable mechanism the free extremity of the thread will be drawn through the
loops a and b. Hereby the knot as represented in Figure 7 will be effected.
As soon as the pair of tongs withdrawn from the loops, the tubes, hand, h¹
will be returned into original position by means of springs arranged in suitable
'
manner.
I, CARL ERNST PREUSSE, Zweinaundorfer Strasse, of Leipzig-Anger-Crottendorf,
in the Kingdom of Saxony, German Empire, 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 an improvement in devices for stitching paper and
has for its object to provide a mechanism by means of which a safety knot in
the stitching thread is effected in simple manner. My invention essentially
consists of a pair of tongs moved forward and backward by any suitable propulsion
mechanism. This pair of tongs passes through the loops formed by the thread
after it is pushed through the paper by means of the usually employed stitching
needles.
Before it reaches the last loop it opens somewhat to close again immediately
afterwards, thereby catching the free extremity of the thread. If now the pair
of tongs is withdrawn, the thread is drawn through the loops and a safety knot is
effected.
My invention will be the better understood with reference to the drawings filed
with the Provisional Specifications, in which similar letters denotė similar parts
throughout the different views, and in which:
Figure 1 shows a section through a sheet of paper to be stitched and my
mechanism before entering the loops.
Figure 2 is a section through the same, the pair of tongs traversing the loops.
Figure 3 shows a corresponding section in the moment where the pair of tongs
is withdrawn, in order to effect the knot.
Figures 1, 2 and 3" illustrate the plan views of the corresponding Figures 1,
2 & 3.
Figure 4 illustrates a detail elevation of my mechanism, the open position o
the tongs being represented in dotted lines.
$1
of

page_text: Figure 5 is a section of the same.
Figure 6 illustrates the formation of the knot.
Figure 7 illustrates a knot when closed.
The paper to be stitched is placed upon the table f. Three stitching needles
push in known manner the stitching thread through the paper, thereby forming
after withdrawal three loops a b c . The first stitching needle is pushed lower
down than the two following, thus a greater loop will be formed. The lowest
extremity of this greater loop is turned upwards by any suitable mechanism,
so as to form a double loop as shown in the drawing (Figures 1-3).
Small tubes h h¹ are located underneath the table upon which the paper is
stitched, in such a manner, that the stitching needles when descending and
forming the loops b and c, press the thread into these tubes h and h¹.
The pair of tongs, which I employ in my construction, consists of two
legs which generally are closed but automatically open somewhat before they
reach the third loop c. This is effected by a suitable cam m (Fig. 5). When the
pair of tongs is open the free extremity of the thread will be caught and kept
within the legs when the same close again. The upper leg of this pair of
tongs is provided with an elastic nose g which has the purpose to push against
the projections and of the tubes h and 1. thereby effecting a revolution of
the tubes. When the thread is pushed into the paper, the loops will lie in the
same direction as the pair of tongs, but they will be turned somewhat when the
elastic nose g of the upper leg presses against them.
When now, the pair of tongs has passed through the double-loop a, the nose g
pushes against the projection and turns the same round 90°. Thereby the
loop of the tube h will effect the same rotation and the pair of tongs is allowed
to pass through the loop b. The same will be the case when the third loop c.
Before reaching the third loop the lower leg 2 of the pair of tongs will open and
immediately afterwards close again thereby catching the, free extremity of the
thread. When now a backward movement is given to the pair of tongs, by any
suitable mechanism, the free extremity of the thread will be drawn through the
loops a and b. Hereby the knot as represented in Figure 7 will be effected.
As soon as the pair of tongs is withdrawn from the loops, the tubes h and h¹
will be returned into original position by means of springs arranged in suitable
manner.
Having now particularly described the nature of my said invention, and in what
manner the same is to be performed, I declare that what I claim is :-
;--
1. An improved device for stitching paper, consisting of tubes arranged under-
neath the table and taking up the thread-loons, a pair of tongs adapted to pass
through the loops, the first of which is doubled. means for reciprocating said pair
of tongs, for the purpose and substantially as described.
2. An improved stitching mechanism, substantially as described and illustrated.
Dated this 30th day of October 1899
GEO. THOS. HYDE,
1, Broad Street Buildings, London, E.C., Agent for the Applicant.