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The filling principle derives from the dropper principle, the pen tip is immersed in the ink and the pump is pressed, its expansion causes a depression that causes the ink to flow into the body of the pen. The innovation created by this filling system consists of the presence of the breather tube connected to the nib unit and directly connected to a duct in the ventilation hole of the nib.  

The filling principle derives from the dropper principle, the pen tip is immersed in the ink and the pump is pressed, its expansion causes a depression that causes the ink to flow into the body of the pen. The innovation created by this filling system consists of the presence of the breather tube connected to the nib unit and directly connected to a duct in the ventilation hole of the nib.  

Questo fa sì che si possa ripetere la pressione sulla pompetta più volte, per effettuare diverse azioni di caricamento e riempire progressivamente la penna. In assenza dello sfiatatoio infatti, con la compressione della pompetta si farebbe fuoriuscire l'inchiostro presente nel corpo non essendovi sfogo per l'aria contenuta nello stesso, ottenendo così una capacità molto limitata; lo sfiatatoio fornisce invece una via d'uscita all'aria presente nel serbatoio che viene compressa dalla pompetta, ed una via di ingresso per l'inchiostro che viene risucchiato dalla depressione. Si può così ripetere la compressione della pompetta e continuare a caricare inchiostro fintanto che quest'ultimo non supera il livello dello sfiatatoio, riempiendo totalmente la penna.<noinclude>

This allows you to repeat the pressure on the pump several times, to perform different filling actions and progressively fill the pen. In the absence of the breather tube in fact, with the compression of the pump, the ink present in the barrel would escape, since there is no vent for the air contained in the same, thus obtaining a very limited capacity; the breather tube instead provides a way out to the air present in the tank that is compressed by the pump, and a way in for the ink that is sucked in by the depression. In this way it is possible to repeat the compression of the pump and continue to load ink until the latter does not exceed the level of the breather tube, completely filling the pen.<noinclude>

==Brevetti correlati==

==Related Patents==

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