| 摘要 |
PURPOSE:To judge abnormality such as jamming, deficiency of premixed liquid etc. by judging a signal from a means that detects pressure of a suction system connected to a means that detects pressure of a developer circulating system and a squeezing device by an abnormality judging circuit. CONSTITUTION:When a vacuum switch 12 became from OFF to ON within 0.5sec and a solenoid valve 9 is opened, concentrated toner in a concentrated toner container 10 is deficient, and this is indicated. In case the vacuum switch 12 continues OFF state for more than 0.5sec, a vacuum pump 14 connected to a squeezing device 3 is operated to operate the device 3. When the vacuum switch is ON, jamming is not caused and liquid in a premix tank 7 is deficient, and accordingly, this is indicated. When the vacuum switch became OFF, an electrostatic recording paper 4 is separated from the slit 13 of the device 3. Accordingly, jamming is caused in this case. Therefore, jamming is indicated and the device is stopped immediately. |
