Main door for the control of the access opening to a compartment, particularly a garage compartment

A main door for the control of an access opening to a compartment, comprising:

• a fixed portion associable with the access opening of the compartment and comprising two lateral uprights and an upper crossbar;
• a mobile portion including at least a leaf associated in a mobile way with said fixed portion;
• at least a pulley associated with the top of at least one of said lateral uprights and on which winds up at least partially a cable connected to the leaf and to a counterweight;
• at least an operating shaft of said pulley mounted on said upper crossbar;
• at least a winding-unwinding device mounted on said upper crossbar and having a flexible element which can be wound and unwound which is associated with the top of said leaf;
• at least an electric motor mounted on said upper crossbar and suitable for placing a driving shaft in rotation;
• and
• at least a transmission and distribution unit associated with said electric motor, suitable for transmitting and distributing a motion from said driving shaft to said operating shaft and to said winding-unwinding device;
• wherein said transmission and distribution unit comprises:
• at least a first electromagnetic clutch placed between said driving shaft and said operating shaft;
• at least a second electromagnetic clutch placed between said driving shaft and said winding-unwinding device;
• and
• at least an electronic processing and control unit which is electronically connected to said first electromagnetic clutch and to said second electromagnetic clutch and which is suitable for operating said first electromagnetic clutch, to transmit said motion from said driving shaft to said operating shaft, and for operating said second electromagnetic clutch, to transmit said motion from said driving shaft to said winding-unwinding device.