| (57) The present invention relates to a plate drawing apparatus comprising:
a) a supporting structure formed by a punch-holder part and by an opposite part, connected
by at least two, preferably four, tension elements;
b) a punch supported by said punch-holder part and adapted to engage and disengage
a corresponding die, the coupling between said punch and said die determining the
shape of the drawing of said plate;
c) an abutment body supporting said die and slideable along said tension elements
for a stroke at least corresponding to the depth of the drawing to be obtained on
said plate.
The abutment body is formed by a first element supporting said die and by a second
element; said first and said second element being mutually coupled by means of a plurality
of short-stroke pistons supported by one of said elements; said second element being
lockable in working position by virtue of mechanical locking means; the working pressure
required for drawing being obtained by means of the action of said plurality of short-stroke
pistons; the sliding of said abutment body required for the extraction of the drawn
part being obtained by means of the release of said mechanical locking means.
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