| 摘要 |
PROBLEM TO BE SOLVED: To eject ink droplets to prescribed positions on a printing medium to retain printing quality in the case where a plurality of conveyance belts are arranged perpendicularly to a printing medium conveyance direction to convey the printing medium and the printing is performed by ejecting the ink droplets from an inkjet head on the conveyed printing medium. SOLUTION: Linear encoder scales are recorded on all the magnetic layers 31 of the plurality of conveyance belts 6, 7. The magnetic layers 31 are detected by means of a magnetic sensor 33 to obtain an average moving speed of moving speeds of the conveyance belts, and then an ink droplet ejection timing signal is output according to the average moving speed. Specifically, a pulse cycle of the linear encoder scale which is recorded by a resolution of the printing quality is counted, and the ink droplet ejection timing signal is output by a cycle of an average value of the pulse cycles of the four conveyance belts. COPYRIGHT: (C)2008,JPO&INPIT
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