Patent ID: 8240825
Filing Date: 2012-08-14
Classification: B41J

Abstract:
1. A printing fluid refill cartridge for a 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 comprising: an outlet arranged to be engageable with one of the refill ports; a first engagement member arranged in the vicinity of the outlet for releasable engagement with a second engagement member arranged in the vicinity of the refill port; a syringe assembly containing the printing fluid, the syringe assembly having a plunger biased to discharge the printing fluid from the syringe assembly; a ratchet connected to the plunger; and, 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 unit 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.