Importance

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Abstract

A writing instrument has an ink reservoir, a nib and a feeder which temporarily stores ink which is pushed out of or pulled into the ink reservoir. The ink reservoir communicates with the nib through an ink supplying passage. The feeder chamber communicates with the atmosphere through an atmosphere communicating passage and with the ink reservoir through a capillary flow passage. The cross-sectional area of the capillary flow passage is small enough to hold ink in the capillary flow passage due to a surface tension of the ink. When the pressure in the ink reservoir due to a temperature change, etc., ink flows in the feeder chamber through the capillary flow passage or is returned from the feeder chamber to the ink reservoir. Since the feeder chamber is hollow, its volume is large and has a simple structure, the feeder can be manufactured easily. A low flow resistance of the capillary flow passage provides good response for compensation for a pressure change.

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First Claim