| 摘要 |
A method of detecting the alignment of print heads (14, 16, 18, 20, 22) relative to one another in an ink jet printer having a plurality of print heads arranged side by side in a first direction (Y) on a carriage (10), each print head having a conductive nozzle plate (24) which defines an edge (30; 32, 34) that extends in said first direction (Y), wherein a sensor (36) is used for determining the position of a reference mark (24) formed on the print head, characterised in that the sensor (36) is used to measure a capacitance between the nozzle plate (24), serving as the reference mark, and the sensor (36), and the alignment detection comprises the steps of moving the carriage (10) relative to the sensor (36) in said first direction (Y) into a first position ("b") where said sensor (36) extends across said edge (32) of one print head (14), and a second position ("d") where said sensor (36) extends across the edge (30) of another print head (16), measuring the capacitances in said first and second positions, and comparing the measured capacitances, thereby to determine a relative position of said print heads in a second direction (X) orthogonal to said first direction (Y).
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