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.

The invention relates to a print head of a binary continuous jet printer comprising: means for producing a plurality of ink jets in a cavity, delimited by lateral walls, and by an upper wall and a lower wall, means for separating drops or sections of one or more of said jets intended for printing from drops or sections that do not serve for printing, a slot, which passes through the lower wall, enabling the exit of ink drops intended for printing, a gutter for recovering drops or sections not intended for printing, means for injecting gas into the cavity, and for making this gas circulate, in the cavity, to the means for producing a plurality of ink jets in said cavity, then to the gutter.

An embodiment of this invention solves memory shortage that occurs in enlargement processing of an image because a web application holds data of an image or the like not as binary data but as character string data. In the embodiment, a processor in an information processing apparatus executes a program including a first program layer with an instruction set to be interpreted and executed by the processor and a second program layer with an instruction set interpreted in advance by a unit other than the processor in the following way. That is, the first program layer draws an image, and divides and enlarges the drawn image using a memory. Image data of each of a plurality of images obtained by the division and enlargement is output from the second program layer to an external device.

A method for feedback control of ink temperature in inkjet printing includes pumping ink through supply and return lines of an ink distributor and between these lines through print heads supplied in parallel with the ink, comparing a temperature actual value with a predefined temperature setpoint value and calculating a manipulated variable for a setpoint value of an ink heater from a setpoint/actual value deviation. A flow sensor is operated between the supply and return lines in parallel with the print heads and measures the flow of the ink or generates a measurement signal dependent on the flow. The flow or the measurement signal is converted by a predefined characteristic curve into a temperature auxiliary value used as the temperature actual value or temperature setpoint value for feedback control. This enables continuous unimpaired production by inkjet printing, particularly upon changes in viscosity of the ink in industrial inkjet printing.

The purpose of the present invention is to suppress variance in the print quality of an inkjet recording device. In order to solve the above problem, the present invention is an inkjet recording device of a charge control type equipped with two or more nozzles which are disposed side by side in a print head, the inkjet recording device being characterized by the following: having a control unit for performing print control independently for each of a plurality of printing configurations; the control unit having an input unit whereby current values of print elements of each of the printing configurations can be periodically checked, and having an output unit whereby the print elements during a subsequent print can be modified; and in that the control unit further adjusts each of the nozzles for every print so as to cause the charging voltage, deflecting voltage, and ink pressure of the subsequent print to approach a reference value.

A method for feedback control of ink temperature in inkjet printing includes pumping ink through supply and return lines of an ink distributor and between these lines through print heads supplied in parallel with the ink, comparing a temperature actual value with a predefined temperature setpoint value and calculating a manipulated variable for a setpoint value of an ink heater from a setpoint/actual value deviation. A flow sensor is operated between the supply and return lines in parallel with the print heads and measures the flow of the ink or generates a measurement signal dependent on the flow. The flow or the measurement signal is converted by a predefined characteristic curve into a temperature auxiliary value used as the temperature actual value or temperature setpoint value for feedback control. This enables continuous unimpaired production by inkjet printing, particularly upon changes in viscosity of the ink in industrial inkjet printing.

An inkjet recording device automatically determines an excitation voltage of a piezoelectric element for formation of ink droplets. An excitation voltage value is applied to the piezoelectric element of a nozzle over a plurality of sweeping events. A charge voltage is applied to ink droplets generated by the applied excitation voltage value in a plurality of arbitrary printing phases to give an electric charge thereto. A charge amount given to the ink droplets is detected by a sensor to obtain a printing phase. When the relationship of a current printing phase to a previous printing phase detected for each sweeping event is reversed from an increasing side to a decreasing side and two decrease determinations of the printing phase are established in succession, an excitation voltage value corresponding to the printing phase of the sweeping event immediately before the first decrease determination is set as a final excitation voltage value.

A valve comprises an orifice plate (1) having one or more orifices (4) through which a fluid may flow, and one or more piezo-electric elements (2). Each element (2) has a face positioned to contact the orifice plate at an orifice. Each element has a first state in which it abuts the plate to prevent flow of fluid through the associated orifice and a second state in which the face is spaced from the plate to allow flow through the associated orifice. A controller (50) selectively applies a first voltage to an elements to cause it to adopt the first state and applies a second voltage to the one or more elements to cause the elements to adopt the second state.

A contact-type patterning apparatus includes: a nozzle comprising an electrode configured to receive a voltage to generate an electric field toward a substrate, and configured to eject a fluid so that the fluid is connected to the substrate; a voltage supply configured to apply the voltage to the electrode; a screw-type pump configured to supply the fluid into the nozzle through a screw configured to receive power from a motor to rotate; a transfer part configured to transfer the nozzle or the substrate so that the fluid is patterned in a line shape; and a controller configured to control a level of the voltage applied through the voltage supply, an operation of the transfer part, and an operation of the pump.

A system (93) monitors the break-up phase of an electrostatic deflection continuous ink jet printer to identify phase instability likely to be caused by a partial blockage of the jet-forming device (17). It ignores alternations between adjacent phase positions and brief unrepeated periods of phase disruption. Preferably it ignores phase changes caused by changes in other operational parameters of the printer, such as variations in ink pressure. Monitoring may be done in the printer (99) or in an external system (93), (95).