Patent ID: 6602012
Filing Date: 2003-08-05
Classification: B43K

Abstract:
A so-called collector type writing instrument comprising:a point assembly having a writing point at the front end thereof; an ink tank for storing free-state, relatively low-viscosity ink having a viscosity of 2 to 100 mPaÂ·s at normal temperature; a feeder portion for feeding ink from the ink tank to the writing point; and a collector made up of a plurality of vane-like adjusting elements for adjusting the internal pressure of the ink tank by making use of capillary capacity and a longitudinal groove serving as an air/liquid exchanger groove and connected to the vane-like adjusting elements, characterized in that: the collector has a partitioning portion comprised of a frontmost partitioning portion capable of shutting off air communication between the ink tank and an outside air other than through the air/liquid exchanger, a rearmost partitioning portion and connecting partitioning portions for connection between the frontmost partitioning portion and the rearmost partitioning portion; main retaining grooves are formed from the frontmost partitioning portion toward the point assembly side; auxiliary retaining grooves are formed between the frontmost partitioning portion and the rearmost partitioning portion; air grooves connected to the outside air are formed in both the auxiliary retaining grooves and the main retaining grooves; the air/liquid exchanger and a narrow groove for leading ink to the air/liquid exchanger are formed between the frontmost partitioning portion and the rearmost partitioning portion; and lateral grooves for leading ink from the narrow groove to the connecting partitioning portions are provided.