Inkjet printing apparatus

An inkjet printing apparatus for carrying out printing by ejecting ink on a recording medium, the apparatus comprising:

• a conveyer belt with a plurality of belt holes formed therein, the conveyer belt suctioning and conveying the recording medium with a negative pressure acting on the belt holes;
• a platen with a plurality of through holes formed therein, the platen slidably supporting the conveyer belt;
• pressure reducing means for generating the negative pressure on a side of the platen opposite from a side thereof supporting the conveyer belt;
• at least one inkjet nozzle disposed to face the platen, the inkjet nozzle ejecting the ink on the recording medium being conveyed by the conveyer belt;
• distance changing means for changing a distance between the inkjet nozzle and a surface of the conveyer belt on which the recording medium is suctioned;
• and
• position adjusting means for adjusting relative positions of the through holes relative to the inkjet nozzle based on the distance,
• wherein, when the distance is large, the position adjusting means adjusts the relative position of at least one through hole in a through hole group relative to the inkjet nozzle such that the position of the at least one through hole is shifted away from the inkjet nozzle, the through hole group including the through holes positioned upstream in a conveyance direction of the recording medium from and nearest to each position corresponding to the at least one inkjet nozzle in a plan view and the through holes positioned downstream in the conveyance direction from and nearest to each position corresponding to the at least one inkjet nozzle in the plan view.

An inkjet printing apparatus for carrying out printing by ejecting ink on a recording medium, the apparatus comprising:

• a conveyer belt with a plurality of belt holes formed therein, the conveyer belt suctioning and conveying the recording medium with a suction force generated at the belt holes;
• a platen with a plurality of through holes formed therein, the platen slidably supporting the conveyer belt;
• pressure reducing means for generating a negative pressure on a side of the platen opposite from a side thereof supporting the conveyer belt to generate the suction force at the belt holes via the through holes;
• at least one inkjet nozzle disposed to face the platen, the inkjet nozzle ejecting the ink on the recording medium being conveyed by the conveyer belt;
• distance adjusting means for adjusting, in a case where the recording medium is an envelope, a distance between the inkjet nozzle and a surface of the conveyer belt on which the recording medium is suctioned such that a larger distance between the inkjet nozzle and the surface of the conveyer belt is provided for a larger width of the envelope in a direction perpendicular to a conveyance direction of the envelope;
• and
• opening/closing adjusting means for adjusting, in the case where the recording medium is an envelope and when the distance is large, opening and closing of the through holes such that an area where the suction force is generated has a large width in the direction perpendicular to the conveyance direction.