| 摘要 |
In response to a print end instruction from a controller, a development controller checks if the ink density is proper. If the ink density is out of proper range, a circulation path switching valve is turned on to continue ink density adjustment processing even after printing ends. The ink circulation path is switched to allow the ink to flow directly to an ink tank. The ink stored in a supply path from the valve to a developing unit and in the developing unit is returned to the ink tank. In this state, the ink density adjustment processing is performed. A transmission type density sensor senses the current density of X %, and sends the density to the development controller. The development controller retrieves proper density range data of N %-M % from a density adjustment table and compares the sensed density with the proper density range data. If X %>M %, L ml of diluted ink solution is supplied by a supply pump. If X %<N %, K ml of ink dye is supplied by the supply pump.
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