Abstract: A device for measuring the flow rate and viscosity of ink sent to a print head of an ink jet printer comprises: a restriction of the diameter of a conduit for the flow of ink arranged in the path thereof defined by the conduit; a sensor for measuring the pressure difference (Pin-Pout) between the pressure of fluid upstream of the restriction and the pressure of ink downstream of the restriction; a viscous leak, creating a pressure drop by friction loss, the viscous leak being in series with the restriction, in the path of the ink defined by the conduit; a sensor for measuring the pressure difference (PinV-PoutV) between the pressure of fluid upstream of the viscous leak and the pressure of ink downstream of the viscous leak; and a circuit for calculating the flow rate and viscosity of ink as a function of: (Pin-Pou)t and (PinV-PoutV).

Abstract: A device for measuring the flow rate and viscosity of ink sent to a print head of an ink jet printer comprises: a restriction of the diameter of a conduit for the flow of ink arranged in the path thereof defined by the conduit; a sensor for measuring the pressure difference (Pin-Pout) between the pressure of fluid upstream of the restriction and the pressure of ink downstream of the restriction; a viscous leak, creating a pressure drop by friction loss, the viscous leak being in series with the restriction, in the path of the ink defined by the conduit; a sensor for measuring the pressure difference (PinV-PoutV) between the pressure of fluid upstream of the viscous leak and the pressure of ink downstream of the viscous leak; and a circuit for calculating the flow rate and viscosity of ink as a function of: (Pin-Pout and (PinV-PoutV).

Abstract: A device (20) for measuring the flow rate of ink sent to a print head of an ink jet printer, comprising: a restriction (22) of the diameter of the flow of ink, arranged in the path thereof, sensors (26, 28) for measuring the pressure difference (Pin?Pout), between the pressure of fluid upstream of the restriction (Pin) and the pressure of ink downstream of the restriction (Pout).

Abstract: A device (20) for measuring the flow rate and the viscosity of ink sent to a print head (50) of an ink jet printer, comprising: a conduit (200), for supplying the print head (50), this conduit being provided with a 1st pressure (Pin) sensor (26) at a first end and a 2nd pressure (PHead) sensor (56) at a 2nd end, circuit or controller (26, 56) for measuring at least the pressure (PHead) of the 2nd pressure sensor (56) and the pressure difference (Pin?PHead) between the 1st pressure sensor (26) and the 2nd pressure sensor (56).

Abstract: A device (20) for measuring the flow rate and the viscosity of ink sent to a print head (50) of an ink jet printer, comprising: a conduit (200), for supplying the print head (50), this conduit being provided with a 1st pressure (Pin) sensor (26) at a first end and a 2nd pressure (PHead) sensor (56) at a 2nd end, circuit or controller (26, 56) for measuring at least the pressure (PHead) of the 2nd pressure sensor (56) and the pressure difference (Pin?PHead) between the 1st pressure sensor (26) and the 2nd pressure sensor (56).

Abstract: A device (20) for measuring the flow rate of ink sent to a print head of an ink jet printer, comprising: a restriction (22) of the diameter of the flow of ink, arranged in the path thereof, sensors (26, 28) for measuring the pressure difference (Pin?Pout), between the pressure of fluid upstream of the restriction (Pin) and the pressure of ink downstream of the restriction (Pout).

Abstract: The invention relates to an ink and/or solvent cartridge (10) for an industrial printer, such a cartridge including at least one semi-rigid or deformable volume (14), being provided with an aperture (16), and having a given maximum capacity VCmax, and holding a hermetically enclosed volume of liquid comprising an ink and/or a volatile solvent, and a gas volume, the sum of these 2 volumes being lower than the maximum capacity VCmax, and in the whole temperature range between 10° C. and 35° C. and for a 1 bar pressure.

Abstract: The invention relates to an ink and/or solvent cartridge (10) for an industrial printer, such a cartridge including at least one semi-rigid or deformable volume (14), being provided with an aperture (16), and having a given maximum capacity VCmax, and holding a hermetically enclosed volume of liquid comprising an ink and/or a volatile solvent, and a gas volume, the sum of these 2 volumes being lower than the maximum capacity VCmax, and in the whole temperature range between 10° C. and 35° C. and for a 1 bar pressure.

Abstract: This invention relates to an ink jet printer and a method of managing the ink quality of such a printer, wherein information on ink pressure P, temperature T, jet speed V, and the nominal ink characteristics (&rgr;n(T), &mgr;n(T)) is available. When the machine is started for the first time, the ink jet is varied at its nominal value and the resulting pressure is measured so as to determine the values a and b characteristic of the ink circuit, the characteristics of the utilized ink &rgr;(T), &mgr;(T), and the difference in level between the print head and the pressure transducer H. These values allow to set the desired pressure value and to take corrective action on ink quality.

Abstract: The present invention relates to an ink circuit comprising an ink cartridge (10), an additive cartridge (11), a recovery tank (12), a storage tank or accumulator 913), a main filter (24), solenoid valves (8), an ink transfer pump (14) equipped with a pressure/temperature sensor (53), an air pressure regulator (30), said ink circuit comprising a double face support unit with a hydropneumatic face and an electronic face making it possible to separate the hydraulic, pneumatic and electronic assemblies, all the functional components being fitted outside on one or other of the two faces.

Abstract: The present invention relates to a diaphragm pump comprising an entirely pneumatic control mechanism, which has a double acting jack (18), to which is connected a diaphragm (19), delivery being obtained by the pressurizing of several chambers (15, 16, 17), admission being obtained by the preparation of a first chamber (15), the other chambers (16, 17) being under atmospheric pressure.

Abstract: Disclosed is a method to optimize the operation of an ink-jet printer provided with a circuit to collect the ink not used for the printing, comprising a gutter connected to an imperviously sealed ink tank by a conduit placed in a state of depression by a constant flow pump checking the flow rate of ink in the conduit by the measurement of the pressure in the ink tank and controlling the operation of the pump either at its minimum suction rate compatible with efficient collection of the ink or at its maximum suction rate during anomalies of collection.

Abstract: An accumulating chamber has its fluid pressure regulated between the pressure of a given source pressure value and a discharge pressure value. Electronic control of the accumulating chamber pressure is accomplished by a regulator having a transfer volume and first, second, and third solenoid valves. The transfer volume is connected to the accumulating chamber by the first solenoid valve. The second solenoid valve connects the transfer volume to a pressure source at the given source pressure value. A third solenoid valve connects the transfer volume to open air. A pressure sensor measures the pressure in the accumulating chamber and is connected to an electronic control system.