Improvements in Apparatus for Forming Bending Lines in Cardboard and like Materials.
Year: 1899

page_text: Date of Application, 10th Mar., 1899
Complete Specification Left, 4th July, 1899-Accepted, 30th Sept., 1899
Improvements in Apparatus for Forming Bending Lines in
Cardboard and like Materials.
I, CARL FRIEDRICH ROSENCRANTZ, of Annenstrasse, 42, Dresden, in the
Kingdom of Saxony, Civil Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
My invention relates to improvements in apparatus of the kind patented in
the United States to John E. Stannard on December 2nd 1880 No. 235821 and
serving for the production of bending lines in cardboard, which apparatus is
characterized by a fixed table like frame in connection with which and jointed
thereto is a second table so arranged as to be capable of swinging on its axis.
The surface of the latter, and of the frame are in the same plane. Above both
these and near to those edges thereof which are facing one another two vertically
movable bars are provided. The piece of cardboard to be bent or folded is placed
on the surface of the table and by a simultaneous downward movement of the
bars is held fast on the two tables, and the movable table is then brought nearer
to the fixed table or frame by moving it upon its axis. The cardboard held
full up
so as to produce
against the tables is by these means caused to bend or
a groove or bend therein. As is evident this operation requires two movements
for its accomplishment, namely the descent of the bars and the bringing of the
movable table and the fixed table, as also the bars, nearer to one another.
"
By my invention the construction of the mechanism is simplified and with
the result that the movement of one part necessarily brings about the other
required movements and effect.
The nature of my invention is as follows:
In lieu of the two tables, one movable one fixed, I use two beams of rectangular
section, cach being at its ends provided with pivots or journals by which it is
supported in bearings.
The two beams are so arranged at a suitable distance from one another and
parallel, that their upper surfaces are slightly inclined backwards. This raises
the top edges that face each other, of the two beams. Suitably arranged springs
or weighted levers maintain the beams in such position, and when they have
been forced to change such position, bring them back into it.
Above the raised edges of the two beams there is provided a vertically movable
plunger. If this is moved downwards so far as to press upon the edges of the
beams under it, these will be forced down and at the same time be caused to
approach one another. Now if before the plunger descends a piece of cardboard
or other like material in which a bend is to be produced is placed upon the
working edges of the two oscillating beams, this cardboard will first be forced
against the working edges of the plunger and thus retained between these and
the plunger. If now the further descent of the plunger causes the depression
of the beams and consequent approach towards each other of the working edges
thereof, the part of the cardboard between them must be pressed together or
"fulled up" and thereby assume the form of a folding line.

page_text: It is advantageous to form the working surface of the plunger slightly curved
in transverse section, or slightly to bevel it from the centre towards the long
edges.
Dated the Tenth day of Monah 1900
NEWNHAM BROWNE,
Agent for the Applicant.
Improvements in Apparatus for Forming Bending Lines in
Cardboard and like Materials,
I, CARL FRIEDRICHI ROSENCRANTZ, of Annenstrasse, 42, Dresden, in the
Kingdom of Saxony, Civil Engineer, do hereby declare the nature of this inven-
tion 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 improvements in apparatus such as is now commonly
in use and known as the American type of machine and serving for the production
of bending lines in cardboard. The object of the present improvements is to
simplify the construction and thereby the manipulation of the apparatus.
is
In such apparatus there is usually a fixed table and one that is capable of motion
round a spindle or shaft, and above each of these is a vertically movable plunger.
By the downward motion of the plunger the cardboard to be operated upon
held between the plunger and the tables and the movable table with the plunger
corresponding thereto being set in motion, the cardboard is caused to "full up
or in other words it is "stowed"
or upset by the fixed table. In order to
make a bend or groove in a cardboard, two operations are thus required.
<
";
"
Instead of these two operations, my improved apparatus only requires one, to
produce the same effect. It is represented in the accompanying drawings in
which Fig. 1 is an elevation and Fig. 2 an end view of the apparatus.
In lieu of the two tables used in certain machines two beams a, are used in
this invention. These beams are journalled, so as to be capable of rotation on
pivots at their ends. The upper surface of each of these beams a is bevelled.
or reduced at its outer side and this makes the working edges of the same, which
are turned towards one another, sharp cornered.
Centrally over the space between the two beams there is a vertically movable
plunger, b, the working surface of which viz. the face which is presented towards
the beams a, a is bevelled from the centre towards the long sides. These bevels
must bear a definite relation to the sharp corners of the working edges of the
beam, a.
An imaginary line bisecting the angle at the working edge of each beam a, a,
if produced so as to fall on the bevel of the plunger which faces towards it, ought
to form with such bevel, an obtuse angle towards the centre of the apparatus
and consequently, an acute angle towards the opposite side, the preferable rela-
tion being such that the obtuse angle is about 100 degrees.
By this arrangement the following is obtained:
Firstly the pressure for holding the cardboard to be operated upon, is nearly
perfect as it is applied in an almost vertical direction. Secondly: the small
inclination at which the centre-line bisecting the angle of the edge, is to the
corresponding working face, (of the plunger) imparts to the working edges of
the beams a the inclination or tendency to slide inwards on the corresponding
plunger surface when the latter is forced against the former with sufficient force.

page_text: On this on the other hand, is based the fact, that with this improved apparatus
only one operation is required for bending or grooving a cardboard.
When the plunger b is moved downwards, upon the cardboard introduced into
the apparatus (that is to say placed on the beams a, a) for the purpose of being
operated upon, then the cardboard is first of all so seized, or secured between the
working faces of the plunger on the one hand, and the working edges of the
beans a a on the other, as to be unable to shift upon the latter. By reason of
the inclination of the line bisecting the angle of the edges, to the working faces
of the plunger 6 opposite the same, the cardboard, together with the working
edges of the beams a, a (which latter in this operation turn in their journals)
will slip inward on the faces of the plunger, when the pressure acting on the
plunger is sufficient.
As this slipping of the cardboard on the two working faces of the plunger tends
towards the centre, the part of the board between the two places where it is
held fast, will assume the shape shown in Fig. 3, that is, to say the form of a
groove.
The distance between the working edges of the beams, a, a, when at rest, should
vary according as to whether the cardboard to be operated upon is thick or thin.
To enable this distance to be regulated the following arrangement is adopted.
On each of the beams, a, there is mounted a pendant arm, c. Between the
ends of the pendant arms c, there is a wedge d, capable of adjustment by screw
gear and hand wheel, c, so as to rise or fall. The lowermost position of the
wedge d, corresponds to the greatest distance between the working faces of the
beams a, the highest position of the wedge corresponding to the least such
distance.
The spring f, attached to both arms c, c serves to maintain the beams a in
their position of rest, or to bring them back to such position.
Along its whole length the plunger bhas, at the part between the two working
faces thereof, a narrow groove b¹, which groove has to answer a double purpose.
Firstly it facilitates the correct placing of the card board to be operated upon as
it indicates the centre line of the bend to be produced, and secondly its sharp edges
prevent shifting of the cardboard at the moment at which the plunger comes
into contact therewith.
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:-
An improved apparatus for grooving or scoring cardboard, or preparing the
bend therein, said apparatus being characterized by two beams, a, a, capable
of rotation on their journals, the working edges of these beams (which edges are
turned towards one another) being sharp cornered; and by a plunger, b, above
the said two beams a, a, capable of vertical motion, and having two bevelled
working faces, the cardboard being firstly held between the working faces of the
plunger b and the working edges of the beams a, a when the plunger descends,
the further descent of the plunger causing the cardboard together with the
working edges of the beams a, (turning on their journals in this operation) to
move inwardly the part of the cardboard between the two lines where it is held
being "stowed" forced up, or grooved, so as to allow the cardboard readily to
be bent.