Print head unit

A print head unit comprising:

• a print head for ejecting droplets of a marking material;
• an electronic print head controller electrically connected to the print head;
• and
• a coupling assembly for mechanically coupling the print head and the print head controller,
• wherein in an assembled state, the coupling assembly provides a first coupling state and a second coupling state,
• wherein in the first coupling state, the print head and the print head controller are fixed relative to each other,
• wherein in the second coupling state, the print head and the print head controller are enabled to move relative to each other within a range limited by the coupling assembly,
• wherein the print head unit is in the second coupling state when the print head unit is mounted in a carriage of a scanning inkjet printing assembly, and
• wherein the print head unit is in the first coupling state when the print head unit is not mounted.