JPH0225656Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pen core for a writing instrument in which an ink guide core is inserted to guide ink to the writing portion.

In recent years, as a liquid writing instrument that is attached to devices such as printers, an ink guide core that guides ink to the writing part is inserted on the outer peripheral surface of the pen core body.
Those formed by fitting a body portion with an ink storage portion have come into widespread use.

However, with conventional pen nibs, when the ink in the ink reservoir becomes low, surface tension causes the annular corner formed by the inner peripheral surface of the ink reservoir and the rear end of the pen core body to become circular. If arc-shaped ink adheres to the ink, or if the ink surface in the ink storage section falls below the ink guide wick when writing horizontally, the ink supply to the ink guide wick will stop, and the ink cannot be used effectively. It was hot.

The present invention eliminates these drawbacks and enables use without leaving any ink in the ink reservoir. That is, an ink guide core that guides ink to the writing part is inserted, and a body part having an ink storage part on the outer peripheral surface is fitted on the rear end surface of the pen core body, which communicates with the ink guide core and has a capillary force. This is a writing instrument pen core with radial grooves.

The feature of the present invention is that a groove having a capillary force is provided in the rear end surface of the pen core main body inserted into a barrel having an ink storage section at the rear so as to communicate with the ink guiding core. Therefore, the arc-shaped ink of the annular corner portion, the ink of the lower end portion during horizontal writing, etc., can be supplied through the groove to the ink guide core without remaining, and the ink can be used effectively.

In the present invention, the ink guide core can be used in either a felt-tip pen whose tip itself serves as a writing part, or a pen with another writing tip attached to the tip, such as a water-based ballpoint pen, fountain pen, recording pen, or felt-tip pen.

In the present invention, the body may have a structure that is separate from the neck or a structure that is integrated with the neck. The annular groove of the pen core has a labyring shape that bends and folds back.
Any spiral or parallel annular ink retention groove may be used.

Next, embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, a barrel 1 having a cylindrical shape with a bottom has a neck 3 having a ventilation hole 2 attached to the opening at the tip, and the outer circumference of the pen core body 4 on the inner circumferential surface of the tip behind the neck 3. The rear half part is formed as an ink storage part 5 by being fitted onto the surface. The ink guide core 7 inserted into the core hole 6 of the pen core body 4 is inserted into the holder 8 provided in the neck 3 with the writing tip protruding, and the rear end is inserted into the ink storage section 5. It's made to stick out. The outer peripheral surface of the pen core body 4 is provided with an annular groove 9 formed as a single path with a labyrinth structure that is bent and folded back, and the tip communicates with the ventilation hole 2 and the rear end communicates with the rear end of the annular groove 9. An air passage 10 is provided without intersecting the annular groove 9, and an ink suction groove 11 communicating with the core hole 6 is provided at the tip of the annular groove 9. On the other hand, grooves 12 that communicate with the core hole 6 and have capillary force are radially provided on the rear end surface of the pen core body 4.

When writing with a writing instrument equipped with a pen core constructed as described above, the ink 13 in the ink storage section 5
flows out to the writing tip through the ink guide core 7,
External air flows into the ink reservoir 5 through the vent hole 2, air passage 10, annular groove 9, ink suction groove 11, and ink guide wick 7 in order, and the inside becomes at an appropriate pressure so that writing can be continued. When more than the appropriate amount of ink 13 flows into the ink guide wick 7 due to changes in temperature or atmospheric pressure, shock, etc., it flows into the annular groove 9 from the ink suction groove 11 and is temporarily retained, so that dripping etc. is prevented. It can be prevented. Furthermore, ink 1
3 is consumed, and the arc-shaped ink 15 adheres to the annular corner 14 formed by the inner peripheral surface of the ink storage portion 5 and the rear end surface of the pen core body 4 due to surface tension.
Also, when the ink surface 16 drops below the ink guiding core 7 during horizontal writing, each ink 1
3 and 15 are introduced into the radial groove 12 by capillary force, and from there to the ink guide wick 7, which has a strong capillary force, so that ink can be supplied with almost no residue left behind.

In the embodiment shown in FIG. 3, unlike the previous embodiment, the body part ₁₁ is integrated with the neck part, but the other structure is the same as that of the previous embodiment, and the operation is also the same as that of the previous embodiment. .

Since the present invention has the above-described structure, it has the advantage of being able to supply the ink in the reservoir to the end without running out of ink, and is especially suitable for horizontal writing and liquid type ink such as plotters that use a small ink reservoir. Works extremely effectively in recording pens, etc.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway vertical sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of the pen core body in FIG. 1, and FIG. 3 is a longitudinal sectional view of another embodiment. 1, _{1 1} ... body, 2... vent, 3... pen core body, 5... ink storage section, 7... ink guide core, 9... annular groove, 10... air passage, 11... …
Ink suction groove, 12... groove, 13, 15... ink, 14... corner, 16... ink surface.

Claims (1)

[Scope of utility model registration request] An ink guide core 7 for guiding ink to the writing part is inserted, and a capillary tube is connected to the ink guide core 7 on the rear end surface of the pen core main body 4 which has a body part 1 having an ink storage part 5 on the outer peripheral surface. A pen core for a writing instrument in which grooves 12 having force are provided radially.