| 摘要 |
PROBLEM TO BE SOLVED: To correctly position an inkjet nozzle head at a printing position.SOLUTION: A digital sheet printing apparatus includes: an inkjet nozzle unit movably supported on a frame 3a between a printing position where nozzle heads 34a-34d for discharging ink come close to a sheet for printing and a retreat position where they separate from the sheet; a tapered hole part 298b provided on an inkjet nozzle unit side or on a frame side and formed to get larger in diameter toward an opening; a first reference plane (T) provided on the inkjet nozzle unit side or on the frame side; a tapered pin part 509 provided on the frame side or on the inkjet nozzle unit side and formed to get smaller in diameter toward a distal end and engaging with the tapered hole part; a second reference plane (S) provided on the frame side or on the inkjet nozzle unit side and in contact with the first reference plane (T); and nozzle unit urging means (503, 506, 508, 514, 516, 276 and 278) for urging the inkjet nozzle unit to press the first reference plane (T) and the second reference plane (S). |
