(57) This invention discloses a digital printing apparatus including a sheet supply device
(2), printing cylinder (33), inkjet nozzle portion (34), sheet delivery device (4),
and conveyance devices (36,37,39,31b) . The sheet supply device supplies sheets one
by one at a predetermined period. The printing cylinder includes at least one gripper
device (33a-33c) that grips and holds the sheet, and conveys the sheet while one edge
of the sheet supplied from the sheet supply device is held by the plurality of gripper
devices. The inkjet nozzle portion discharges ink droplets onto the sheet conveyed
by the printing cylinder, and prints on the sheet. The sheet delivery device discharges
the sheet after the end of printing by the inkjet nozzle portion. The conveyance devices
(36,37,39,31b) include a plurality of gripper devices including one reversing gripper
(31bt) device that grips and holds the other edge of the sheet, convey the sheet printed
on one surface, which is received from the printing cylinder in a double-sided printing
mode, while sequentially transferring the sheet by gripping changes by the plurality
of gripper devices, and supply to the printing cylinder (33) the sheet turned by reversing
the obverse/reverse surface of the sheet by the reversing gripper device in the process
of conveyance.
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