Patent ID: 7771031
Filing Date: 2010-08-10
Classification: B41J

Abstract:
1. An ink refill unit for a print engine, the unit comprising: a body assembly defining an ink ejection port at one end thereof; a compressible bellows tank located inside said body assembly; a mechanical compression arrangement for compressing the compressible bellows tank, said mechanical compression arrangement comprises: an elongate drive gear mounted within the body assembly and engaging with the plunger assembly; wherein, the threaded wall and circular plunger assembly includes an internal lead screw thread provided in a substantially cylindrical internal wall of the body assembly and a helical geared thread provided about the circumference of a substantially circular plunger threaded to the internal lead screw thread and extending along a length thereof, wherein the lead screw thread is provided with a gap along the length of the body assembly in which the drive gear sits and is able to come into contact with the geared thread of the plunger.