Ballpoint pen tip, ballpoint pen refill, ballpoint pen, and method of manufacturing ballpoint pen tip

Abstract

Provided are a ballpoint pen tip which can, even if ink having properties which assures that the amount of supply of the ink to the pen tip by shear of a writing ball is sufficient is adopted, prevent partially faint written traces from occurring and provide smooth writing, a ballpoint pen refill, a ballpoint pen, and a method of manufacturing a ballpoint pen tip. A triangular pyramid-shaped recess (42) gradually tapered toward an ink guide hole (36) is provided in the bottom of a ball housing (31), and troughs (44) formed in the recess (42) are utilized as ink reservoirs and ink paths. Because the troughs (44) have sufficient length, width, and depth, the amount of containment of the ink and the amount of supply of the ink are increased. Also, even if ink which is supplied to the pen point mainly by shear of a writing ball (2A) is adopted, the supply of the ink to the pen point is not interrupted, the occurrence of partially faint written traces of ink is sufficiently prevented, and friction between the writing ball and a ball receiving seat surface can be reduced.

Description

technical field [0001] The present invention relates to a ballpoint pen tip provided with a writing ball for transferring ink adhering to the surface to an object to be written, a ballpoint pen cartridge having the ballpoint pen tip, a ballpoint pen, and a method for manufacturing the ballpoint pen tip. Background technique [0002] Conventionally, ballpoint pens such as oil-based ballpoint pens and gel-ink ballpoint pens have been widely used as writing utensils. As such a ballpoint pen, generally, a ballpoint pen head with a free-rotating writing ball for writing is provided at the front end thereof, and an ink storage portion for storing ink is connected to the rear side of the ballpoint pen head. [0003] The ball point pen head is provided with: a ball room, which is formed as a storage space for receiving freely rotatable writing balls; a back hole (back hole), which extends from the rear end of the ball point pen head to the vicinity of the ball room; and ink The gui...

AI Technical Summary

Problems solved by technology

[0023] In addition, in the ballpoint pens such as (1) to (3) above, in order to sufficiently prevent the occurrence of blurring, there is a problem that if the passage groove is increased, or the size of the passage groove is only increased, even if measures such as providing a coil spring are implemented, also does not prevent DC

However, it is difficult to increase the amount of ink supplied to the radially inner side of the support surface.

Therefore, when the area of ​​the support surface is increased, the amount of ink supplied to the radially inner portion of the support surface may be insufficient.

Therefore, it is not necessarily possible to prevent poor rotation of the writing ball

Therefore, there is a problem that a smooth writing feeling cannot be ensured

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