Hydraulic power supply unit, particularly for auxiliary actuators in presses

An actuation and supply unit, particularly for auxiliary actuators adapted to actuate complementary fixtures or tools in die-forming presses actuated by a main actuator, said supply unit comprising:

• a hydraulic power source associated with a fluid reservoir;
• a power accumulation section connected with said power source for accumulating hydraulic power;
• at least one auxiliary actuator associated with said accumulation section;
• and valve means for controlling fluid flow between the power source and the accumulation section and said at least one auxiliary actuator,
• further comprising:
• fluid distribution means constituted by a selectively actuatable pressure fluid distributor interposed between said accumulation section and said at least one auxiliary actuator;
• pressure limiting means for limiting fluid pressure provided by said hydraulic power source during hydraulic power accumulation;
• and mechanical actuation means for actuating said pressure limiting means, said accumulation section being interposed between said power source and said fluid distribution means and in direct driving engagement with said mechanical actuation means so as to continuously control operation of said pressure limiting means and of said valve means so as to render independent, at any time during operation, said fluid distributor and said at least one auxiliary actuator from said power source.