Fast operation device for the head in die-cutting machines, particularly flag type

Fast head operating device for die-cutting machines, particularly flag type, comprising a hydraulic circuit with one end connected to a feed pump and the other to two cylindrical chambers defined at the base of a column supporting the head of the die-cutting machine, said hydraulic circuit comprising a control valve, interlocked to electric operating means, equipped with a seal which slides into and is engaged in the body of the same valve to form a fluid communication between a feed conduit and a first inlet conduit, which flows into one of said cylindrical chambers for the rise of the column carrying the head of the die-cutting machine and with a second inlet conduit which flows into the other cylindrical chamber for the downstroke of the abovementioned column, characterized by the fact that it comprises a sequence valve, interposed on said first inlet conduit, a further fluid conduit branching from said second inlet conduit, immediately upstream from the respective cylindrical chamber, the latter conduit flowing into a cylindrical chamber into which a small piston slides and is engaged, carrying, at the opposite end, the mobile contact of a pressure switch connected to said electric operating means.