Image forming apparatus

An image forming apparatus, comprising:

• a head unit configured to include line-type recording heads for ejecting ink droplets;
• a first base member configured to hold the head unit;
• a second base member configured to hold the first base member movably at least in a vertical direction;
• a transport mechanism disposed facing the recording head and configured to transport a sheet;
• a maintain-recovery mechanism disposed downstream from the transport mechanism in a direction in which the sheet is transported and configured to maintain and recover the line type recording heads;
• and
• a head drive mechanism configured to move the head unit between a position facing the transport mechanism and a position facing the maintain-recovery mechanism in the direction in which the sheet is transported.

An image forming apparatus, comprising:

• a head unit configured to include line-type recording heads for ejecting ink droplets;
• main tanks configured to store the ink;
• sub-tanks supplied with the ink from the respective main tanks;
• supply tubes through which the ink is supplied from the sub-tanks to the recording heads respectively;
• a first base member configured to hold the head unit;
• a second base member configured to hold the first base member and the sub-tanks;
• a transport mechanism disposed facing the recording heads and configured to transport a sheet;
• a maintain-recovery mechanism disposed downstream from the transport mechanism in a direction in which the sheet is transported and configured to maintain and recover the line type recording heads;
• and
• a head drive mechanism configured to move the head unit between a position facing the transport mechanism and a position facing the maintain-recovery mechanism in the direction in which the sheet is transported, and to cause the first base member to move with the second base member therebetween.