Ink supply structure for inkjet head

An inkjet head for performing printing on a printing medium by ejecting ink onto the printing medium, the inkjet head comprising:

• an ejector unit that ejects the ink in accordance with a driving signal;
• and
• a drive substrate unit that supplies the driving signal to the ejector unit,
• wherein the ejector unit includes:
• a base plate;
• an ejector that ejects the ink from an ejection outlet to the base plate, the ejector being arranged in the base plate;
• and
• an ejector-side connector that receives the driving signal,
• the drive substrate unit includes:
• a drive substrate that generates the driving signal;
• a drive-substrate-side connector that outputs the driving signal;
• and
• a case that holds the drive substrate and the drive-substrate-side connector,
• the drive substrate unit is detachable from the ejector unit in an axial direction orthogonal to the base plate,
• when the case is mounted on the ejector unit, the drive-substrate-side connector and the ejector-side connector are connected to each other and form an exposed portion that exposes part of the base plate,
• the ejector includes:
• an internal tank that temporarily stores the ink ejected from the ejection outlet;
• and
• a head body where the internal tank is arranged therein and has a side wall being in parallel with the axial direction,
• the ejector unit further includes:
• a feed ink line that passes the ink supplied to the internal tank;
• and
• a first opening formed in the exposed portion and communicating to the internal tank,
• the case includes:
• a side wall that expands into a cylinder shape towards one side in the axial direction;
• and
• a top plate that covers an end of the side wall on the other side in the axial direction opposite to the one side in the axial direction, the end being away from the base plate,
• the feed ink line is connected to the first opening at an end on the one side in the axial direction and extends toward the other side along the side wall,
• the end on the other side in the axial direction is located on a side closer to the other side than the top plate, and
• when the case is mounted on the ejector unit, the side wall of the case has an inner surface being contact with the side wall of the head body.