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This design is about a kind of cartridge whose nib can be separated from the ink tube easily. This two
parts are compactly connected with each other by intubation, rubber and thread. we can separate them
when the ink has used up or the nib has been damaged and assembled to another useable cartridge. We can realize the maximization use of ink and nib. By the way, the rubber before the tube is used to segregate the ink from the air.
Hubei University of Technology