Method for printing both sides of paper in a printer

A method for printing on a front side and a rear side of a paper in a printer having a printing unit for printing an image on the paper as it passes through the printing unit, with an inlet portion and an outlet portion, the method comprising the steps of:

• providing a paper supply portion to guide the paper to the inlet of the printing unit;
• providing a paper output portion to guide the paper from the outlet portion of the printing unit to an exterior of the printer;
• providing a non-moveable reversing portion to (1) reverse the orientation of the paper after it passes through the printing unit, and (2) resupply the paper to the inlet of the printing unit;
• supplying a first paper to the printing unit through the paper supply portion to print a front image on the front side of the first paper;
• guiding the first paper on which the front image is printed through the reversing portion to reverse the orientation of the first paper, and keeping the first paper in the reversing portion in a standby state;
• supplying a second paper to the printing unit through the paper supply portion to print a front image on the front side of the second paper;
• guiding the second paper on which the front image is printed through the reversing portion to reverse the orientation of the second paper, and at the same time resupplying the first paper to the printing unit to print a rear image on the rear side of the first paper;
• and
• outputting the first paper through the paper output portion.

A printer for printing on a front side and a rear side of a paper, said printer comprising:

• a printing unit for printing an image on the paper as it passes through the printing unit, with an inlet portion and an outlet portion;
• a paper supply portion to guide the paper to the inlet of the printing unit;
• a paper output portion to guide the paper from the outlet portion of the printing unit to an exterior of the printer;
• and
• a non-moveable reversing portion to (1) reverse the orientation of the paper after it passes through the printing unit, and (2) resupply the paper to the inlet of the printing unit.