Ink issuance orifice protection in an ink jet system printer
AssigneeSharp Kabushiki Kaisha
InventorMasahiko Aiba
Life of this patent
Estimating the term…
Abstract
A protection film formation means is disposed in front of an orifice of a nozzle for isolating the orifice from the ambience. A control means function to form a protection film when an ink jet system printer does not operate, and to remove the protection film when the ink jet system printer operates.
Claims8
In an ink jet system printer of the charge amplitude controlling type which emits ink droplets from an orifice formed in a nozzle, charges said ink droplets by a charging tunnel in accordance with print information, deflects said charged ink droplets as they pass through a constant high-voltage electric field, and deposits said charged, deflected ink droplets on a record receiving member, thereby printing desired symbols on said record receiving member, the improvement comprising:
- film formation means incorporated in said charging tunnel for selectively forming a protection film in front of said orifice in order to isolate said orifice from the ambience;
- and
- drive means for activating said film formation means so that said protection film is formed when said ink jet system printer does not operate, and said protection film is removed when said ink jet system printer operates.
In an ink jet system printer of the charge amplitude controlling type which emits ink droplets from an orifice formed in a nozzle, charges said ink droplets by a charging tunnel in accordance with print information, deflects said charged ink droplets as they pass through a constant high-voltage electric field, and deposits said charged, deflected ink droplets on a record receiving member, thereby printing desired symbols on said record receiving member, the improvement comprising:
- film formation means including an electro-magnet means and a magnetic fluid incorporated between said orifice and said charging tunnel for selectively forming a protection film in front of said orifice in order to isolate said orifice from the ambience;
- and
- drive means for deactivating and activating said electro-magnet means so that said protection film is formed by said magnetic fluid when said ink jet system printer does not operate, and said protection film is removed when said ink jet system printer operates, respectively.
Dependencies are inferred from the claim text.