| 摘要 |
The present invention provides a printer unit which comprises: an input unit placed on a housing to receive an input of an operation input signal from a user; a storage unit to save outputted data; a control unit to apply a paper supply control signal to a paper supply unit using the data saved in the storage unit in accordance to an input signal through the input unit, supplying a piece of paper, and applying an output control signal for a printing unit, comprising: a photoconductive drum to print out, and applying a transfer control signal to a transfer unit which transfers the piece of paper supplied by the paper supply unit to pass through the photoconductive drum and be discharged to the outside after printing; and a returning unit to return the piece of paper discharged after printing out on one side of the piece of paper to the paper supply unit. The control unit, when a double side printing signal is entered for a certain piece of paper through the input unit, applies a returning control signal to the returning unit to conduct a double side printing for a certain piece of paper. |
