Patent ID: 6474895
Filing Date: 2002-11-05
Classification: B43K

Abstract:
A writing instrument provided with an ink chamber that stores ink, a writing element provided on a front end portion of said writing instrument, and an ink control mechanism provided between said ink chamber and said writing element, said ink control mechanism comprising:a blocking chamber with a gas enclosed therein; an ink-chamber-side passage for causing said blocking chamber to communicate with said ink chamber; a writing-element-side passage for causing said blocking chamber to communicate with said writing element; ink holding means for holding the ink entering said blocking chamber from said ink-chamber-side passage at a predetermined position in said blocking chamber; an ink storing portion which is formed in said blocking chamber, and which stores and holds a small amount of the ink, movement of the ink held by said ink holding means to said ink storing portion being blocked by said gas held by the blocking chamber, while said small amount of the ink communicates with said writing-element-side passage; and ink relay means for transferring, when an amount of the ink held by said ink holding means is equal to or more than a predetermined amount, at least part of the held ink to said ink storing portion.