A continuous ink jet print head (10), including: an ink droplet generator (116) configured to emit an ink droplet (158) along an undeflected droplet flight path (30); a charge electrode (118) configured to impart a charge to the ink droplet; deflector plates (120A, 120B) adjacent the undeflected droplet flight path, downstream from the charge electrode, and configured to deflect the ink droplet to a deflected droplet flight path that lies within a range of deflected flight paths bounded by at least deflected droplet flight path and a most deflected droplet flight path; a gutter (122) configured to receive an ink droplet traveling along the undeflected droplet flight path; and an ink buildup sensor (102) configured to detect an accumulation of ink (140) relative to a droplet flight path disposed within the range of deflected flight paths.

An ink-jet recording apparatus configured to record an image based on image data on a sheet, the ink-jet recording apparatus includes a first roller pair, a second roller pair, a carriage, a recording head, and a controller configured to: control the first roller pair and the second roller pair to perform intermittent conveyance of the sheet; control the carriage and the recording head to record a one-pass image on the sheet; and calculate an overlap amount, in the conveyance direction, of a one-pass image to be recorded on the sheet in a predefined one pass and a one-pass image to be recorded on the sheet in a next one pass after the predefined one pass.

An ink-jet recording apparatus configured to record an image based on image data on a sheet, the ink-jet recording apparatus includes a first roller pair, a second roller pair, a carriage, a recording head, and a controller configured to: control the first roller pair and the second roller pair to perform intermittent conveyance of the sheet; control the carriage and the recording head to record a one-pass image on the sheet; and calculate an overlap amount, in the conveyance direction, of a one-pass image to be recorded on the sheet in a predefined one pass and a one-pass image to be recorded on the sheet in a next one pass after the predefined one pass.

A device for forming and ejecting drops of an ink jet of a CIJ printing machine, this device including: a cavity for containing an ink and including an end provided with a nozzle (10) for ejecting ink drops, actuator means (21, 22, 32, 41, 42), in contact with the cavity, in which device the jet velocity modulation, from the nozzle (10), has a value Vj(f.sub.t) at the operating frequency of the cavity and the actuator, and this jet velocity modulation, at the temperature of 15 C. and at the temperature of 35 C., does not vary, in a frequency range of +5 kHz about the operating frequency f.sub.t, outside the range of between 0.25Vj(f.sub.t) and 4Vj(f.sub.t).

A device for forming and ejecting drops of an ink jet of a CIJ printing machine, this device including: a cavity for containing an ink and including an end provided with a nozzle (10) for ejecting ink drops, actuator means (21, 22, 32, 41, 42), in contact with the cavity, in which device the jet velocity modulation, from the nozzle (10), has a value Vj(f.sub.t) at the operating frequency of the cavity and the actuator, and this jet velocity modulation, at the temperature of 15 C. and at the temperature of 35 C., does not vary, in a frequency range of +5 kHz about the operating frequency f.sub.t, outside the range of between 0.25Vj(f.sub.t) and 4Vj(f.sub.t).

A liquid discharge apparatus includes: a head unit that has nozzles that discharge a column-shaped liquid; a liquid droplet generating unit that applies cyclically changing energy to positions of the column-shaped liquids discharged from the nozzles, which are separated from the nozzles, and that generates liquid droplets; and a direction changing unit that changes a flying direction of at least some liquid droplets of the generated liquid droplets.

A liquid discharge apparatus includes: a head unit that has nozzles that discharge a column-shaped liquid; a liquid droplet generating unit that applies cyclically changing energy to positions of the column-shaped liquids discharged from the nozzles, which are separated from the nozzles, and that generates liquid droplets; and a direction changing unit that changes a flying direction of at least some liquid droplets of the generated liquid droplets.

A device for recovery of the atmosphere containing solvent vapours from at least one ink recovery reservoir of a print machine comprising: n (n1) filter(s) arranged at the outlet from at least one ink reservoir (10). Each filter comprises an inlet face, an outlet face, a filter body between the two faces, and conduit(s) for recovering at least part of a liquid condensed on the surface of the inlet face before this liquid has passed through it. Each filter is either: upstream from a condenser, an atmosphere output from the reservoir, passing through the inlet face, and then the filter body and the outlet face before being sent to the condenser;

or downstream from the condenser, an atmosphere from the condenser passing through the inlet face, and then the filter body and the outlet face before being sent to at least one print head of the print machine, respectively.

A device for recovery of the atmosphere containing solvent vapours from at least one ink recovery reservoir of a print machine comprising: n (n1) filter(s) arranged at the outlet from at least one ink reservoir (10). Each filter comprises an inlet face, an outlet face, a filter body between the two faces, and conduit(s) for recovering at least part of a liquid condensed on the surface of the inlet face before this liquid has passed through it. Each filter is either: upstream from a condenser, an atmosphere output from the reservoir, passing through the inlet face, and then the filter body and the outlet face before being sent to the condenser;

or downstream from the condenser, an atmosphere from the condenser passing through the inlet face, and then the filter body and the outlet face before being sent to at least one print head of the print machine, respectively.

A fluid ejection device is provided with a valving element adapted to reciprocate in the containing chamber to thereby push the fluid out from the ejection port, and then block the ejection port with a tip part. The containing chamber is provided with a communication port for accepting the fluid pressure-fed from a supply section. In the case in which the valving element is located at a predetermined stopping position, a internal space of the containing chamber is divided by a boundary part, which is formed of a part of the valving element and a part of the containing chamber having contact with each other, into a first space including a part of the space between the ejection port and the communication port, and a second space in which the communication port opens.