JPS61249793A - Structure of ink storage writing utensil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ink-storing writing implement useful for writing, drawing, cosmetic use, and the like. - (Prior art and problems) Ink storage writing instruments are classified into the following four types, each of which has its own problems. 1. Fountain pen type in which ink is guided from the ink storage chamber to the nib via several capillary passages. The amount of ink flowing out changes depending on the amount of remaining ink, and there is a risk of blowing out due to an increase in pressure within the ink storage chamber.

2. Oil-based ballpoint pen type that directs ink to the writing end from a thin ink storage tube. There is a limit to the inner diameter of the storage tube, so the amount of storage cannot be increased.

3. Marking pen type in which the ink storage body holds ink in a capillary tube. The amount of ink introduced varies greatly depending on the amount of remaining ink, and there is a risk of ink blowing out from the vent holes due to shocks such as dropping.

4. Ink is stored in a sealed container, and a valve connected to the writing end is also opened and closed to direct the ink flow. When the pressure inside the ink storage chamber increases due to a rise in temperature, pushing the valve open will result in an excessive amount of ink being introduced, which may clog the vent hole.

After that, troubles such as ink blowing out and ink running out are likely to occur.

(Means for Solving the Problems) In order to solve the above-mentioned problems all at once, the present invention covers the ventilation holes with a porous ventilation membrane having a water-splashing or oil-leaking surface, and also covers fiber bundles, etc. It was connected to the writing end via a capillary tube through an ink storage body made of.゛ ・ (Example) (1) is a barrel having an ink storage chamber (2) inside, and (3) is! a Ink storage body consisting of a bundle, etc., (4)
is a ventilation hole, and (5) is a ventilation membrane. In this example, emulsion polymerized tetrafluoroethylene powder was rolled,
A porous membrane with a thickness Q of 5 mm and an average pore radius of 1 to 3 μm was used, which had been stretched at a high temperature. (6) is the ink (7) is the writing tip (pen nib), and (8) is the tail cap fitted with the ink 5Ffr, which is the lid of the storage chamber (2).

Figure 1 shows a structure used when there is no temperature change when writing, such as with a recorder, or when the writing end is a water-based ballpoint pen, etc., which has a large ink retention capacity, and the position and number of ventilation holes (4) are related to the amount of conduction. However, you can choose at will.

Figure 2 shows an example of a general writing instrument.
) and the occluding body (3) are separated from each other by a valve (9), and the occluding pipe (]0) containing the occluding body (3) is pushed down by the spring (11) and is pressed against the inner surface of the shaft body (1). There is an air passageway (12) between them. Before writing, hold the barrel (1) and touch the writing end (
If you press 7) against a paper surface, etc., the storage tube (lO) will spring (
11) is compressed and raised, the valve (9) is opened, and ink flows down into the occlusion body (3), where it is occluded until the capillary is saturated.

If the lower end of the writing edge (7) comes into contact with the paper surface etc. during writing, the ink will flow out onto the paper surface etc., but the aeration film (5)
), no ink runs out due to back pressure.

(Operations and effects of the invention) Even if ink seems to leak from the ventilation holes, the water resistance of the ventilation membrane (
The air permeability eliminates the pressure difference between the inside and outside of the ink storage chamber, so ink no longer wicks out from the writing end when not in use.

Since the ink is once kept in a capillary saturated state in the storage body and then guided to the writing end through the capillary, the outflow amount is constant regardless of the amount of remaining ink, and the storage amount is also large.

[Brief explanation of drawings]

Figures 1 and 2 are longitudinal sectional views showing embodiments of the present invention. In the diagram <1) Shaft body (8) Tail crown (2) Ink storage chamber (9) Valve (3) Ink storage body (1o) Storage tube (4) Ventilation hole (11) Spring (5) Ventilation membrane (12) Air passage (6) Ink (7) Writing end (pen tip)

Claims (1)

[Claims] An ink storage writing instrument characterized by using a membrane that is permeable only to gas to ventilate the ink storage chamber, and at the same time, during writing, ink is guided from the ink absorbing body to the writing end (pen nib), which is always close to capillary saturation. structure.