| 摘要 |
PROBLEM TO BE SOLVED: To prevent a striking gap by accurately controlling ink ejection at the time of printing by reflecting a moving speed of a measured conveyance belt and speed variation of a recording medium between recording medium conveyance means. SOLUTION: The ejection control mechanism includes a speed difference data computing part 331 which has a driven roller encoder 312, a paper feed-side encoder 313 and a paper discharge-side encoder 314 for measuring a belt moving speed as the moving speed of the conveyance belt 160 and a moving speed of the recording medium and computes data as speed difference data corresponding to a position gap of an image based on a difference of each speed from the measured belt moving speed, paper feed-side speed and paper discharge-side speed; a storage part 333 which stores the speed difference data; a correcting control part 332 which corrects a detection signal inputted from the driven roller encoder 312 by referring to the speed difference data; and an ejection control part 334 which controls a timing of ink ejection by an ink head so that the position gap between a plurality of images on the conveyance belt becomes small on the basis of the corrected detection signal. COPYRIGHT: (C)2011,JPO&INPIT
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