Ink supply device and inkjet recording device

An inkjet recording device, comprising:

• an inkjet head configured to jet ink to an image receiving medium;
• and
• an ink supply device, wherein
• the ink supply device comprises:
• an ink storage section connected with an inkjet head and configured to store ink to be supplied to the inkjet head;
• a float arranged in the ink storage section configured to float on a liquid surface of the ink to indicate a height of the ink in the ink storage section;
• and
• a floating position detection device configured to detect a floating position of the float in the ink storage section, wherein
• the float is supported rotatably around a rotating shaft in the ink storage section;
• the floating position detection device comprises a detection target arranged on the float, and a target detection section which is arranged in the ink storage section and detects that the detection target approaches;
• and
• the target detection section is arranged on a wall substantially orthogonal to an axial direction of the rotating shaft of the ink storage section.

A method of monitoring ink supply for an inkjet head, comprising:

• storing ink in an ink storage section to be supplied to an inkjet head;
• floating a float on a liquid surface of the ink to indicate a height of the ink in the ink storage section;
• detecting a floating position of the float in the ink storage section;
• supporting the float rotatably around a rotating shaft in the ink storage section;
• and
• detecting an approaching detection target on the float, wherein a target detection section is arranged on a wall substantially orthogonal to an axial direction of the rotating shaft of the ink storage section.