JPH0142838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a non-directional pen body.

The pen body of a fountain pen has a direction when writing, but in order to make it non-directional like a ballpoint pen, there are three
A non-directional pen body has been put into practical use in which the book blades are made to protrude radially at equal intervals, the front part is shaped into a conical shape, and a pen point ball is welded to the tip. This type of non-directional pen body is made by bending a roughly triangular plate material into a 120 degree V shape.
It was manufactured by spot welding two pieces back to back. Therefore, the cost is high due to the large number of component parts and processes, and the positioning of the rough plates and the pen point ball may shift due to overlapping and spot welding or welding the pen point ball to the tip, resulting in defects. There was a problem that many non-defective products were produced.
Furthermore, since the ink is transmitted to the tip of this pen body along the surface of the valley between the blades, the ink storage capacity of the pen body itself is small, so it is difficult to cover the pen with a cap during writing. If I left it on my desk without using it, the ink would run out in a short period of time. In order to solve this problem, providing an ink reservoir inside the pen body further increases the number of steps.

Therefore, an object of the present invention is to provide a method for manufacturing a non-directional pen body that can be manufactured using a simple process with a small number of components and that does not run out of ink even when left on a desk. , a step of drawing out a pipe material into a shape in which three or more blades protrude radially at equal intervals and forming vertical gaps within the blades and cutting it to a predetermined length;
The front part of the blade part is ground by grinding etc. to form it into a conical shape, and the tip is shaped into a hemispherical shape to form a pen tip. It is characterized by including a step of cutting a slotted groove, and a step of subjecting the pen tip to a hardening treatment such as ion nitriding, ion plating, or hard chrome plating.

Embodiments of the present invention will be specifically described below based on the drawings.

The material 10 is a stainless steel pipe with an outer diameter of about 5 mm and a wall thickness of about 0.3 mm, and as shown in FIG.
It is drawn out in a shape that protrudes radially at 120 degree intervals and has valleys 2 between them, but at this time a gap 11 with a width of about 0.1 mm is formed in the blade part 1 by the inner wall of the material 10. This is then cut into lengths of approximately 15 mm. As the next step, as shown in Fig. 3, the front part of the blade part 1 is ground to form the whole into a conical shape. This part becomes the pen nib 3 to complete the external shape of the pen body. Next, as shown in FIGS. 4 and 5, three slotted grooves 4 cross each other at 120 degree intervals at the center of the pen tip 3 and cut through from the valley 2 to the gap 11 of the blade 1. be done. This slotted groove 4 serves as an ink passage to the pen tip 3, and
When writing, the pen body flexes to give a good writing feel, and this flexure serves to draw out the ink.Since the gap 11 and the slotted groove 4 are in communication, the gap 11 serves as an ink storage area. fulfill the role of The width of this slot 4 is said to be about 0.1 to 0.15 mm,
When the pen body is completed, make a groove 4 of this width on the nib 3.
When there is a large width, the capillary action of the ink is weak, and when writing, the ink sticks to the paper surface and the writing taste is poor. For nib 3
Since the cross section of the pen is no longer circular, as shown in FIG. 6, the pen tip 3 is finished into a circular shape by grinding with a hard grindstone while the groove 4 is closed, thereby ensuring non-directionality for writing. Then, because minute burrs are generated on the edge of the slot 4 when cutting the slot 4 or grinding the pen tip circularly, check again with the slot 4 open as shown in Fig. 4. Then chamfer the edges with a curvature of about 0.02R using a soft grindstone. This chamfering provides a good writing feel without scratching the paper surface when writing, but this degree of chamfering does not impede non-directionality.

Next, the pen tip 3 is subjected to a hardening process, and examples of the process include ion nitriding, ion plating, and hard chrome plating. Examples of these processing methods are as follows.

(1) Ion nitriding method The pen body is connected to the cathode in the device, and CH ₄ ,
A nitriding gas such as N ₂ or H ₂ was introduced, and a DC voltage of several hundred volts was applied to generate a glow discharge on the pen tip 3, and the treatment was performed under the following treatment conditions.

Example 1 Gas ratio N ₂ : H ₂ = 1:1 Processing temperature 510°C Processing time 40 minutes Example 2 Gas ratio N ₂ :H ₂ = 2:3 Processing temperature 500°C Processing time 60 minutes Example 3 Gas ratio N ₂ :H ₂ :CH ₄ =1:1:2 Processing temperature 550℃ Processing time 90 minutes (2) Ion plating method High hardness of metal nitrides and carbides is applied to the pen tip 3 under the conditions shown in the following example. The material was plated.

Example 4 Processing vacuum degree 1×10 ^-2 ~ ^{10 -1} Pa _N2 Gas amount 50ml/min Same gas pressure 2Kg/ ^cm2 Processing time 20 minutes Reaction metal Titanium Processing temperature 150℃ Example 5 Processing vacuum degree 1×10 ^-2 ~10 ^-1 Pa C _{2 H} 2Gas amount 10ml/min Same gas pressure 1Kg/ ^cm 2Treatment time 10 minutes Reaction metal Titanium Treatment temperature 200℃ Example 6 Processing vacuum degree 1×10 ^-2 ~5×10 ^{- 2} Pa CH ₄ Gas amount 50ml/min Same gas pressure 1Kg/cm ² Processing time 10 minutes Reaction metal Silicon processing temperature 200℃ (3) Hard chrome plating method Hard chrome plating was applied to the pen nib 3 under the conditions shown in the following example. I went.

Example 7 Chromic acid 250g/Sulfuric acid 2.5g/Processing temperature 45~55℃ Current density 60~80A/dm In all of the above examples, the hardness of the nib ³ is sufficient and the pen is durable. You can get a body. After the hardening process, the front part of the pen body is assembled using a press or the like as shown in Fig. 7 to complete the pen body, and a three-pronged pen core is attached to the trough 2, which is then attached to the barrel. It is provided for writing.
Note that in the above embodiment, three blade portions 1 were provided with an interval of 120 degrees, but three or more blade portions 1 may be provided.

In this way, the present invention creates a conical shape with protruding blades by drawing and grinding the pipe material, and forms the tip into a hemispherical shape and hardens it, without overlapping plate shapes and spot welding them. Furthermore, since a gap that serves as an ink reservoir is simultaneously formed inside the pen body, the number of component parts is small, the process is simple, the cost is low, and there are no frequent occurrences of defective products. Since the internal gap acts as an ink storage section, the ink storage capacity of the pen body is improved, and the ink will not run out even if the pen is left on a desk for a long time without covering the cap. Since the slotted grooves are cut through, the pen body flexes and provides a good writing taste.Furthermore, the pen tip is finished in a hemispherical shape, ensuring the non-directionality that is a feature of this pen body, and thus making it easy to write. According to the invention, it is possible to manufacture a non-directional pen body that has a good writing feel and does not run out of ink, using a small number of parts and a simple process.

[Brief explanation of drawings]

FIG. 1 to FIG. 7 are process explanatory diagrams of an embodiment of the present invention. 1... Feather part, 2... Valley part, 3... Pen tip, 4
...Sliding groove, 10...Material, 11...Gap.

Claims (1)

[Claims] 1. The process of drawing out the pipe material and cutting it to a predetermined length in a shape in which three or more blades protrude radially at equal intervals, with vertical gaps formed within the blades, and The front part is ground by grinding to form a conical shape, and the tip is shaped into a hemispherical shape to form a pen tip, and a groove of a predetermined depth is created from the tip in the valley between each blade part. 1. A method for manufacturing a non-directional pen body, comprising the steps of: cutting through the pen tip; and subjecting the pen tip to hardening treatment such as ion nitriding, ion plating, and hard chrome plating.