Patent ID: 6512900
Filing Date: 2003-01-28
Classification: G03G

Abstract:
A wet type electrophotographic image forming apparatus employing an ink containing a solvent, comprising:a liquefying device for cooling said solvent evaporated during an image forming process and collecting liquefied solvent; an air pump sucking vapor left unliquefied by said liquefying device and maintained in a vapor state; a pressure sensor detecting a suction pressure of said air pump; alarm means for comparing an absolute value of a pressure data generated by said pressure sensor and indicative of said suction pressure and a predetermined pressure range and generating an alarm when said absolute value of said pressure data is out of said pressure range; a concentration sensor provided in the vicinity of a rotary absorbing body for absorbing said solvent, for detecting a vapor concentration of solvent, and said alarm means compares a vapor concentration data generated by said concentration sensor with a predetermined vapor concentration range while said air pump is in operation normally, to make judgment of lacking of solvent supply when said vapor concentration is smaller than said vapor concentration range and to make judgment of fatigue of said filter when said vapor concentration data is greater than said vapor concentration range.