To provide an ink-jet type printing machine by which a paper reversing mechanism is unnecessary while an ink-jet printing head is arranged downward in the same way as an ordinary case, and double-side simultaneously printing is possible in an ink-jet type printing.

Patterns on double sides of the surface and the back face can be simultaneously transferred by preparing a pairs of two ink-jet machines and blankets, respectively discharging inks from the ink-jet mechanisms onto blankets to form the patterns, and placing a paper between two blankets to apply a printing pressure thereon.