| 摘要 |
PROBLEM TO BE SOLVED: To provide a printing device which can satisfactorily print at all times both in printing on the surface of paper and in printing on the back. SOLUTION: The printing device is provided with two printing process units, one for printing on the surface of the paper 19 and the other for printing on the back. In the back-printing-process unit 2 which prints later, toner 9b that is smaller in amount of electrification than toner 9a stored in the surface- printing process unit 1 which prints first is stored. Thus, the toners having the proper amounts of electrification for surface printing and for back printing can be supplied, therefore the satisfactory printing is always possible both in printing on the surface of the medium and in printing on the back. Also, because even in the case environment changes, the device can cope with it and always maintain constant print-quality. |
