JPH0450150Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a writing instrument that uses water-based ink.

[Prior art and its problems]

For example, in a writing instrument that uses water-based ink, such as a water-based ballpoint pen, the water-based ink in an ink storage body housed in a barrel is transmitted to a ball, which is a pen body, through a relay member, and is used for writing. here,
For example, the relay member is a capillary porous material made of bundled fibers, so if it is left for a long time, the water-based ink in the relay member will easily evaporate, and the ink will not be sufficiently transferred to the pen body when writing starts. , there is a problem that ink runs out. Furthermore, in order to reliably transmit ink to the ball, the position of the tip of the relay member is important, and it is necessary to ensure that it comes into contact with the ink passage of the tip, which is the holding member for the ball. If the connection between the relay member and the ink passage of the chip is incomplete, ink will not be transferred sufficiently and ink will run out. Therefore, the relay member must be fixed to the chip so that it does not move even if vibrations or shocks are applied. Conventionally, methods for fixing a relay member to a chip include deforming the rear end opening edge of the chip inwardly by caulking, or crushing the middle of the cylindrical portion of the chip. but,
These methods have the disadvantage that the relay member is also crushed at the same time, resulting in a decrease in ink transfer ability. There is also the problem that the relay member moves a little during caulking, making it impossible for the tip of the relay member to reliably contact the ink passage of the chip.

Next, water-based markers have a long capillary porous body and an integrated relay member, so the evaporation of water-based ink is similar to that of water-based ballpoint pens, and In order to absorb the pressure, the pen body must be fixed to the pen body holding member, and this fixing work is as complicated as fixing a relay member to the tip of a water-based ballpoint pen.

[Purpose of invention]

Therefore, the present invention provides a water-based writing instrument that has a simple structure that prevents horizontal ink from evaporating from the relay member, and that allows the relay member to be easily fixed to the pen holding member without impeding the ink transfer ability. The purpose is to

[Structure and operation of the invention] In the water-based writing instrument of the invention, the relay member that transmits the water-based ink in the ink storage body to the pen body is covered with a thermoplastic resin layer, and this thermoplastic resin layer is covered with the pen body holding member. It is characterized by being fused.

That is, since the relay member is covered with a thermoplastic resin layer, water-based ink can be prevented from evaporating from the relay member, but furthermore, this thermoplastic resin layer can be coated with ultrasonic heating or high-frequency heating. It is easily softened and can be easily fused to the pen holding member without interfering with the ink transfer ability of the relay member.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 1 shows an example in which the present invention is applied to a water-based ballpoint pen, in which a pen holding member 2 called a tip is fitted at the tip of a barrel 1. A ball-shaped pen body 3 is freely rotatably held at the tip of the pen body holding member 2 with a portion of the pen body 3 exposed, and
A relay member 4 is inserted into the center hole of the pen holding member 2. This relay member 4 is made of a fiber bundle, and its outer peripheral surface is covered with a thermoplastic resin layer 5 made of, for example, polyacetal resin. The thickness of the thermoplastic resin layer 5 is about 10 to 100 μm, and the thermoplastic resin layer 5 is melted and fixed to the pen holding member 2.

FIG. 2 shows a thermoplastic resin layer 5 formed using ultrasonic waves.
The ultrasonic welding machine has a cradle 7 having a concave portion of the same shape as the cylindrical portion 2a of the pen body retaining member 2, and a concave portion of the same shape at the tip thereof. It consists of a vibrator 9 that is connected to a tool horn 8 and an oscillator (not shown) to transmit ultrasonic vibrations to the tool horn 8. 9 is activated, ultrasonic vibrations are transmitted to the thermoplastic resin layer 5, and the thermoplastic resin layer 5 is melted in an extremely short time. Then, when the operation of the vibrator 9 is stopped, the molten thermoplastic resin layer 5 solidifies and is fixed to the pen holding member 2. Note that the method for melting the thermoplastic resin layer 5 is not limited to ultrasonic waves, and can also be easily carried out using, for example, high-frequency power.

An air hole 11 is formed at the tip of the shaft cylinder 1, and a plurality of vertical ribs 12 are formed inside the tip, and the ink storage body 6 is received by the vertical ribs 12. The ink storage body 6 is formed into a rod shape by arranging crimped ultrafine fibers of polyester, for example, and has a large ink storage capacity. has been done. Therefore, the water-based ink stored in the ink storage body 6 is transmitted to the pen body 3 through the relay member 4 and used for writing.

Next, FIG. 3 shows an example in which the present invention is applied to a water-based marker. The rod-shaped pen body 3 protruding from the pen body holding member 2 is a capillary porous body, and the rear end is inserted into the ink storage body 6. It is integrated with the relay member 4. The outer peripheral surface of the relay member 4 is covered with a thermoplastic resin layer 5, and the thermoplastic resin layer 5 is melted and fixed to the pen body holding member 2 to receive writing pressure.

In this way, since the outer peripheral surface of the relay member 4 is covered with the thermoplastic resin layer 5, evaporation of water-based ink from the relay member 4 exposed between the pen holding member 2 and the ink storage body 6 is prevented. be done. Therefore, even if the pen is left unused for a long period of time, ink is always present in the relay member 4 and transferred to the pen body 3, so that ink does not run out when starting writing. In addition, since the thermoplastic resin layer 5 is easily melted by ultrasonic waves or high-frequency heating and fixed to the pen body holding member 2,
This has the advantage that the fixing work is very simple and the ink transfer ability of the relay member 4 is not inhibited.

[Effect of idea]

As explained above, the water-based writing instrument of the present invention is
The relay member that transfers the water-based ink in the ink storage body to the pen body is covered with a thermoplastic resin layer, and this thermoplastic resin layer is fused to the pen body holding member, so the structure is simple and the relay member transfers water-based ink from the relay member to the pen body. It is possible to provide a water-based writing instrument that prevents evaporation of water-based ink and allows the relay member to be easily fixed to the pen holding member without impeding ink transfer ability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an explanatory diagram of a welding process, and FIG. 3 is a sectional view of another embodiment. DESCRIPTION OF SYMBOLS 1... Barrel, 2... Pen body holding member, 3... Pen body, 4... Relay member, 5... Thermoplastic resin layer,
6... Ink absorber, 7... pedestal, 8... horn tool, 9... vibrator.

Claims (1)

[Scope of utility model registration request] A water-based writing instrument characterized in that a relay member for transmitting water-based ink in an ink storage body to a pen body is covered with a thermoplastic resin layer, and the thermoplastic resin layer is fused to a pen body holding member.