Hewlett-Packard Development Company, L.p.

Hewlett-Packard Indigo B.v.

Hp Indigo B.v.

Nissim Henn

Chen Talmor

Barry J Oldfield

Assaf Pines

Boris Livshitz

Yoram Hart

Guy Fefferman

Capacitances are measured for a level measurement capacitive sensor () spanning from a lower end to a higher end of a fluid level measurement range (), a first capacitive calibration sensor () below the fluid level measurement range (), and a second capacitive calibration sensor () above the fluid level measurement range (). A degree to which the lower end of the fluid level measurement range () is immersed in a first fluid and the upper end of the fluid level measurement range () is immersed in a second fluid is determined based on a capacitance of the level measurement capacitive sensor (), a first calibration value characterizing the first fluid and derived from a capacitance of the first capacitive calibration sensor (), and a second calibration value characterizing the second fluid and derived from a capacitance of the second capacitive calibration sensor ().

Capacitive fluid level sensing

A method of buffering and controlling the tension of a print substrate moving through a web press comprises: supporting a loop of print substrate on a movable roller, wherein translational movement of the roller is controlled by a motor; and controlling the motor to achieve a sequence of roller movements arranged to control tension of the substrate during a sequence of variations in substrate velocity during a printing cycle.

Buffering and tension control system and method

An ink cartridge has a container to contain ink and a valve member. The container has an outlet to output ink contained in the container. The valve member is moveable transverse to the outlet to open and close the outlet and carries a seal to seal the outlet when closed by the valve member.

Ink cartridges and outputting ink from ink cartridges

A drive assembly has a moveable drive head, which is able to engage a plunger in a cartridge containing a liquid. The cartridge has a plunger moveable by the drive head to extract the liquid from the cartridge.

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Nes Ziona, Israel

Nissim Henn