Back to results
US 6,084,609 AGranted
Ink-jet print head with multiple nozzles per expulsion chamber
AssigneeOlivetti Lexikon S.p.A.
InventorsEnrico Manini, Franco Fabbri, Pier Luigi Soriani
Life of this patent
Estimating the term…
Abstract
An ink-jet print head (12) for a dot printer, in which the drops of ink are expelled from one or more expulsion chambers (16) through corresponding pluralities of nozzles (30), each plurality communicating with each individual chamber. The nozzles (30) communicating with each chamber may be three to nine in number and are suitably arranged so as to obtain a high print quality in particular for the printing of characters with straight edges free from irregularities.
Claims11
An ink-jet print head for a dot printer comprising:
- an expulsion chamber for expelling droplets of ink, said chamber having a substantially parallepiped shape with side walls, a base wall and a closing wall opposite said base wall;
- pressure generating means, deposited on said base wall of said expulsion chamber, for generating a pressure inside said expulsion chamber;
- driving means for selectively driving said pressure generating means;
- and
- a plurality of circular nozzles through which said droplets of ink are expelled, formed on said closing wall and communicating with said expulsion chamber, whereby said pressure generated by said pressure generating means expels simultaneously from said expulsion chamber a corresponding plurality of said droplets of ink, each nozzle of said plurality of circular nozzles having a radius R and a center, said plurality of circular nozzles being disposed according to a geometrical arrangement in which a distance d of the center of a nozzle of said plurality of nozzles with respect to the center of any other nozzle of said plurality of nozzles is not lower than 2.2 times said radius R, wherein said geometrical arrangement comprises a grid having a first reference axis parallel to a reference direction, and a second reference axis orthogonal with said first reference axis.
2 more elements
An ink-jet print head for a dot printer comprising:
- a plurality of expulsion chambers for expelling droplets of ink, said chambers having a constant pitch and being aligned in a reference direction, each chamber of said plurality of expulsion chambers having a substantially parallepiped shape with side walls, a base wall and a closing wall opposite said base wall;
- pressure generating means, deposited on said base wall of said each chamber for generating a pressure inside said each chamber;
- driving means for selectively driving said pressure generating means;
- and a plurality of circular nozzles through which said droplets of ink are expelled, formed on said closing wall and communicating with said each chamber, whereby said pressure generated by said pressure generating means expels simultaneously a corresponding plurality of said ink droplets from said each chamber, each nozzle of said plurality of nozzles having a radius R and a center;
- said center being disposed in a geometrical position corresponding to a vertex of a polygon;
- wherein said plurality of expulsion chambers is alternately arranged in a first row and in a second row parallel to said first row, each chamber of said plurality of expulsion chambers arranged in said first row communicating with a first plurality of nozzles consisting in four nozzles arranged at vertices of a first square having a side parallel to said reference direction;
- and each chamber of said plurality of expulsion chambers arranged in said second row communicating with a second plurality of nozzles consisting in four nozzles arranged at vertices of a second square having a side inclined at 45.degree. with respect to said reference direction.
4 more elements
Dependencies are inferred from the claim text.