Improvements in or relating to the Pressing of Pasteboard, Metal, and other Materials.
Year: 1893

page_text: Date of Application, 25th Sept., 1893-Accepted, 28th July, 1894
Improvements in or relating to the Pressing of Pasteboard, Metal,
and other Materials.
A communication from EMIL SALTZKORN, Consul, and LUDWIG NICOLAI,
Manufacturer, both of Lobtauer Strasse 20, Dresden, Saxony, German
Empire.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Chartered Patent Agent, 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 :-
The present invention relates to a device in draw presses for metal plate, paste-
board etc. for the production of card or wood board boxes, or other hollow articles
for stretching the material to be drawn with the least possible friction.
At present smooth or furrowed plates, or rings of large surface or movable angle
pieces, are in use, with these however the material to be drawn has, while gradually
yielding, to stand a considerable strain on account of the friction on the large
surfaces of these fixed stretching devices, so that material of feeble consistency
cannot stand this treatment. In the present invention on the other hand the iron
plates are replaced by a simple or double ring of rollers capable of rotation
between which the material to be drawn is stretched. In the case of materials with
a very smooth surface, in order to prevent it yielding too readily, a stretching
ring of inconsiderable breadth may be employed in connection with the double ring
of rollers. In the case of the larger kinds of plates it is advisable to arrange several
rings of rollers concentrically behind each other, the rollers being arranged
alternately so that those of one ring can engage in the intervals between those of
the next. Several stretching rings may also be connected with these being placed
either in front or behind or on both sides of the roller rings.
Finally the rollers may be provided with teeth at their peripheries which engage
with racks connected with the die which racks on the descent of the latter turn
the rollers so as to cause them to draw forward the material to a corresponding
extent.
In the accompanying drawings,
Figure 1 represents a vertical section of a press, a double ring of rollers being
employed.
Figure 2 is a plan of the lower ring of rollers.
Figure 3 is a vertical section, two double rings of rollers and a stretching ring
being employed.
Figure 4 is a plan of the lower ring of rollers and the stretching ring.
Figure 5 a longitudinal section of a horizontal press, toothed rollers and racks
being employed.
Figure 6, the same arrangement disposed vertically, in which a second ring of
rollers with smooth peripheries is employed as a counter-bearing for stretching the
material.
b
Figure 7 view of the toothed rollers in combination with the racks.
Figure 8 transverse section of preceding figure upon the line III-III.
On the bottom swage-block or matrix surrounding the plunger a number of
arms are arranged, which at their upper ends carry the rollers d of one ring,
while on the other side supports or keepers gl directed downwards and provided
with the rollers d' are attached to the collar which surrounds the die e and is
adjustable by the lever combination k. Around this double ring of rollers a

page_text: second and third may be arranged. Stretching rings i may be inserted before or
behind or on both sides of the rollers, and in combination with the latter, when the
collar is brought down retain the material interposed on the plate p between
these two parts. The object of these stretching rings is to hold the material to be
treated tight, so that it may be treated equally at all its parts & may offer on all
sides an equal amount of resistance to the die when the latter is being pressed.
On the die in its downward motion drawing the material into the cavity of the
matrix the rollers d d with or without the co-operation of the stretching rings i,
effect a perfectly equal yielding of the plate inasmuch as they hold it with equal
force along its whole circumference. The movement of the plate effects the
rotation of the rollers, which in consequence exercise only a small amount of
friction on a very small constantly changing surface of the plate p. It becomes
hence possible to work in the draw-press material offering small resistance to
tension (or strain) eg. wood-board. In place of the rollers movable parts in the
form of sectors may be used since when the machine works through only a small
vertical distance the whole circumference of the rollers does not come into play.
In working materials offering very feeble resistance to strain this arrangement is
however not in itself sufficient, and the material requires still further protection.
In such cases the rollers themselves are made to move the material forward,
suitable arrangements being provided for rotating them from outside.
For this purpose a number of rollers or sectors with toothed or roughened
surfaces are arranged laterally to the die in such a manner that they effect, alone or
in combination with the stretching rings, the stretching of the plate of material to
be worked. These rollers or sectors are connected directly or indirectly with the
die or other tool, so that with the advance of the latter they are made to rotate to
a corresponding extent, in order to guide the material (metal plate, paper or wood
board and the like) towards the middle and consequently to diminish or eliminate
the strain on the material resulting from the advance of the die.
For the purpose of effecting this radial motion of the piece of material from its
periphery to the middle, depending on the advancing motion of the die or other
tool, an arrangement is represented in the accompanying drawings Figures 5-8,
in which the transport rollers or sectors are toothed and engage with racks which
are in direct connection with the working dic, so that on the advance of the latter
the toothed rollers are made to rotate to a corresponding extent, whereby the
material to be worked is moved correspondingly.
The box n is adjusted over the die e and rigidly connected with it and from it a
number of arms extend having racks on the inner faces of their lower portions,
which engage with the toothed rollers d'.
As soon as the die e commences to advance against the stretched plate p, the
racks cause the rollers or sectors to rotate to a corresponding extent, and the
latter move the material inwards towards the middle. Hence the material is
compelled to move forward to an extent exactly corresponding to the distance
through which the die has advanced.
It is obviously admissible that the individual parts of the invention may be used
by themselves alone or in any desired combination.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondents and in what manner the
same is to be performed, I declare that what I claim is ;-
1. In draw or stamping presses for metal plates paper or wood board and the
like for the manufacture of boxes and other hollow articles a stretching arrange-
ment for the draw plates consisting of one or more rings of rollers or sectors (dd)
with or without the combination of stretching rings (i) for the purpose of effecting
the yielding of the material with the least possible amount of friction.
2. The modification of the above arrangement consisting in an arrangement of
toothed wheels upon the rollers or sectors such toothed wheels engaging with
racks (1) which are connected with the die (e) and on the downward movement of

page_text: the latter cause the stretched material to be moved along to a corresponding
extent.
3. The combination and arrangement of parts constituting the draw or stamping
press mechanism substantially as described and illustrated in Figures 1 to 4 of the
accompanying drawings.
4. The combination and arrangement of parts constituting the draw or stamping
press mechanism substantially as described and illustrated in Figures 5 to 8 of the
accompanying drawings.
DL: o 1
W. P. THOMPSON & BOULT,
Of London, Nottingham, Liverpool, and Manchester,
Agents for the Applicant.
W. P. THOMPSON & BOULT,
Of London, Nottingham, Liverpool, and Manchester,
Agents for the Applicant.