| 摘要 |
PURPOSE:To positively raise the temp. of the rear part in the rear region of a heating cylinder by correcting the temp. of the heater at other position on the basis of the detection position of a temp. sensor detecting the temp. of the heating cylinder. CONSTITUTION:The power density of the rear part 3b of the heater positioned on the rear side from the detection position of a temp. sensor 6 is increased to increase the heater capacity of the rear part 3b of the heater as compared with that of the front part 3a of the heater positioned on the front side from the temp. sensor 6. A heater 8 is divided into a block of a heater front part 8a and a block of a heater rear part 8b from the detection position of the temp. sensor 6, and the heater front part 8a and the heater rear part 8b are individually connected to a control apparatus 9 to be controlled. In this case, the heater capacity and power density of the heater front part 8a are similar to those of the heater rear part 8b but supplied electric energy is controlled so as to become much in the heater rear part 8b but little in the heater front part 8a. |
