Image forming system and image forming apparatus

An image forming system comprising:

• a first image forming apparatus that is disposed at an upstream side in a feeding direction of a belt-like continuous recording medium;
• and
• a second image forming apparatus that is disposed at a downstream side in the feeding direction of the recording medium,
• wherein each of the first image forming apparatus and the second image forming apparatus comprises:
• a recording head that forms images on the recording medium by ejecting droplets from ejection outlets of the recording head;
• a closing member that serves to close the ejection outlets;
• and
• a controller that monitors head drive data for driving of the recording head, and closes the ejection outlets with the closing member in case a droplets non-ejection state determined from the monitored head drive data is beyond a predetermined first allowable condition during printing, the droplets non-ejection state being a period of time during which no ink droplets are ejected from a recording head.