JPH0142836B2 - - Google Patents

Description

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

The font of a fountain pen has a direction when writing.
To solve this problem, a non-directional pen body has been put into practical use, in which a pen point ball is welded to the tip, three blades protrude radially at equal intervals, and the entire body is shaped into a conical shape. . This type of non-directional pen body is made of approximately triangular plate-like material with 120
It was manufactured by bending these pieces into a V-shape and spot-welding the three pieces back to back. Therefore, there are problems in that there are many steps and the cost is high, and that the plate-like assemblies are misaligned when they are overlapped and spot welded, resulting in a high number of defective products. In addition, this pen body is designed so that the ink is transferred to the tip along the surface of the valley between the blades, so the ink storage capacity of the pen body itself is small, so there is no need to cover the pen with a cap while writing. If left on a desk, 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 has the problem of further increasing 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 through a simple process and that does not run out of ink even when left on a desk.
Its structure consists of a process in which three blades protrude radially at equal intervals and a vertical gap is formed in the blades by pulling out a pipe material and cutting it to a predetermined length. A process of cutting the front part by grinding etc. to form it into a conical shape, a process of welding a pen point ball to the tip, and a process of cutting three grooves from the tip in the direction of the gap between each blade part to a predetermined depth. The first step is to check with the slotted groove closed and then grind the pen point ball so that it is concentric with the pen tip. This method is characterized by comprising a process of chamfering and grinding the edges of the slotted grooves of the ball, and a process of plastically deforming the pen point ball using a press or the like so that the slotted grooves are closed.

The present invention will be specifically described below based on embodiments shown in 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.
As shown in FIG. 2, this material 10 has three blades 1 approximately 1 mm thick protruding radially at equal intervals.
The space between them is pulled out into a shape with a valley 2, but at this time, the inside of the blade 1 has a width due to the inner wall of the material 10.
A gap 11 of about 0.1 mm is formed. This is then cut into lengths of approximately 15 mm. Next, in the second step, as shown in FIG. 3, the front part of the blade part 1 is ground to form the entire conical shape.
A has an arc shape, and the tip surface is circular with a diameter of about 1 mm. Next, in the third step, as shown in FIG. 4, a stainless steel pen point ball 3 having a circular diameter is welded to the circular portion of the tip, thereby completing the external shape of the pen body. And in the 4th step, the 5th
As shown in FIG. 6, three slotted grooves 4 are cut through from the valley portion 2 to the gap 11 of the blade portion 1, intersecting each other at equal intervals at the center of the tip. This slotted groove 4 serves as an ink passage to the pen point ball 3, and also serves to make the pen body flex during writing to provide a good writing feel and to draw out the ink through this flexure. and sliding groove 4
are in communication, so the gap 11 plays the role of an ink reservoir. The width of this slot 4 is 0.1 to 0.15 mm
However, when the pen body is completed, if this wide groove 4 is present in the pen point ball 3, the capillary action of the ink will be weak, and the ink will stick to the paper surface when writing, so it will be drawn together and closed in the final process. However, in the closed state, the cross section of the pen point ball 3 is no longer circular, so the pen point ball 3 is
As shown in the figure, the slotted groove 4 is checked in a closed state and finished concentrically with the pen tip using a hard anchor stone, thereby ensuring non-directionality for writing. Since minute burrs appear on the edges of the slotted grooves 4 during the cutting of the slotted grooves 4 in the fourth step and the ball shape grinding in the fifth step, the slotted grooves 4 are cut in the sixth step as shown in Fig. 5. 4. While open, chamfer with a curvature of about 0.02R along the edge 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. In the final step, as described above, as shown in FIG. 8, the pen body is assembled using a press or the like, a three-pronged pen core is attached to the trough 2, and the pen core is attached to the barrel for use in writing.

In this way, in the present invention, the pipe material is drawn and cut into a conical shape with protruding blades, without stacking plates and spot welding, and at the same time forming a gap inside the pen body that serves as an ink reservoir. Therefore, the process is simple and the cost is low.
There are no frequent occurrences of defective products. Not only does it not require a process to form the gap, but since this gap acts as an ink storage area, the ink storage capacity of the pen body is improved, and it can be left on a desk for a long time without covering it with a cap. The ink never runs out. The grooves are cut through and the edges are chamfered, so the pen flexes and provides a good writing feel.Furthermore, the pen body is finished concentrically, so the non-directionality that is a characteristic of this pen body is achieved. Therefore, according to the present invention, it is possible to manufacture a non-directional pen body with good writing quality and no ink running out through a simple process.

[Brief explanation of drawings]

FIGS. 1 to 8 are process explanatory diagrams of an embodiment of the present invention. 1...Blade part, 2...Tani part, 3...Pen point ball, 4...Sliding groove, 10...Material, 11
……gap.

Claims (1)

[Claims] 1 The process of pulling out the pipe material and cutting it to a predetermined length in a shape in which three blades protrude radially at equal intervals, with vertical gaps formed within the blades, and grinding the front of the blades. A process of cutting to form a conical shape by cutting, a process of welding a pen point ball to the tip, and a process of cutting three slotted grooves to a predetermined depth from the tip in the direction of the gap between each blade part. The process of checking with the slotted groove closed and grinding the pen point ball so that it is concentric with the pen tip, and the process of checking with the slotted slot open and grinding the pen point ball so that it is concentric with the pen tip. A method for manufacturing a non-directional pen body, which comprises the steps of chamfering and grinding the edges of the groove, and plastically deforming the pen point ball by pressing or the like so that the groove is closed.