Patent ID: 8251499

Claim:
A securing arrangement for securing a printing fluid refill cartridge to a printing unit, the printing unit having refill ports each corresponding to a different colour of printing fluid and a push rod for powered actuation between an extended position and a retracted position, the printing fluid refill cartridge having an outlet arran to be engageable with one of the refill ports, and a syringe assembly containing the printing fluid, the syringe assembly having a plunger biased to discharge the printing fluid from the syringe assembly; the securing arrangement comprising; a first engagement member; a second engagement member—for releasable engagement with the first engagement member; a ratchet for connection to the plunger; a pawl for releasably engaging the ratchet to stop movement of the plunger thereby preventing discharge of the printing fluid; wherein, the first engagement member is configured to secure the refill cartridge to the printing fluid such that the outlet engages the refill port corresponding to the printing fluid colour in the syringe assembly and positions the pawl for engagement with the push rod in the extended position to disengage the pawl from the ratchet such that a controlled amount of the printing fluid is dispensed into the printing unit.