Oce Holding B.v.

Benjamin P H Van Rens

Mark Rietbergen

Antonius G Van Rooijen

A method of calibrating a wiper position in an ink jet printer having a nozzle plate and a wiper arranged to wipe the nozzle plate, the nozzle plate having a number of nozzles each of which is in fluid communication with a pressure chamber, each pressure chamber having an actuator for exciting a pressure wave in a liquid in the pressure chamber, and a detection system arranged to detect pressure fluctuations in the pressure chamber includes adjusting the wiper to a position in which it is set against the nozzle plate; exciting a pressure wave in at least one of the pressure chambers; recording the pressure fluctuations in said at least one pressure chamber; deciding, on the basis of the detected pressure fluctuations, whether the wiper is set correctly against the nozzle that is in fluid communication with said at least one pressure chamber; and correcting the position of the wiper if necessary.

Method of calibrating a wiper position in an ink jet printer

An ink handling system for an ink jet printer includes a local ink reservoir associated with a print head assembly of the printer, a fill state sensor arranged to detect a fill state of the local ink reservoir, a pump arranged to supply ink into the local ink reservoir, and a pump controller for controlling an operation of the pump, including controlling an on/off state of the pump, on the basis of a detection result of the fill state sensor. A pump calibration system includes an ink consumption measurement system including a droplet counter for counting a number of ink droplets jetted out by the print head assembly and arranged to calculate a volume V of consumed ink on the basis of the counted number of droplets; a timer for counting an on-time T of the pump; a flow rate calculator arranged to calculate an measured ink flow rate of the pump on the basis of the ratio V/T; and a flow rate drift compensation functionality in the pump controller, the compensation functionality being configured to control the operation of the pump on the basis of the measured ink flow rate.

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Venlo, Netherlands

Benjamin P H Van Rens