Image forming system

An image forming system comprising:

• an ejector configured to eject ink toward a sheet;
• a first conveyor configured to cause the ejector to reciprocate along a main scanning direction;
• a second conveyor configured to convey the sheet in a sub-scanning direction;
• and
• a controller configured to repeatedly perform operations of controlling the first conveyor to convey the ejector along the main scanning direction to a turn position at which the ejector is stopped for turning, controlling the ejector to eject ink toward the sheet in a conveyance process of the ejector, and controlling the second conveyor to convey the sheet in the sub-scanning direction by a particular amount after ejection of ink by the ejector ends, thereby forming an image on the sheet,
• the controller being configured to determine which of a first position and a second position is located at a farther downstream side in a moving direction of the ejector and to set a determined position as the turn position, the first position being a first distance away from an image formation end position in the moving direction, the second position being a second distance away from an image formation start position in the moving direction, the image formation end position being an end position of image formation onto the sheet in a conveyance process of the ejector before turning at the turn position, the image formation start position being a start position of image formation onto the sheet in a conveyance process of the ejector after turning at the turn position, the second distance being longer than the first distance.