Patent ID: 6513902
Filing Date: 2003-02-04
Classification: B41J

Abstract:
An apparatus for restoring an ink jet recording head which performs image recording by ejecting ink droplets to a recording sheet from an ejecting nozzle of the ink jet recording head, comprising:a non-ejection detector for detecting an occurrence of non-ejection of the ink droplets from the ejecting nozzle to output a non-ejection signal; a pressurizing device for increasing an inner pressure of an ink supply passage connected to said ink jet recording head during both a normal and a restoring operation; a pressure measuring device for detecting the inner pressure of said ink supply passage during both the normal and the restoring operation; and a controller-for controlling said pressurizing device based on said non-ejection signal in such a manner that the inner pressure of the ink supply passage detected by said pressure measuring device reaches a set pressure value to eject ink.