JPS61205193A - Ball pen tip and manufacture thereof - 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 The present invention relates to a ballpoint pen tip for a so-called ballpoint pen that transfers ink attached to the surface of the ball to a paper surface etc. by the rotational action of the ball to create a writing state. Regarding its structure and manufacturing method.

``Prior Art J ``Problems to be Solved by the Invention'' Various improvements have been made in the past regarding ballpoint pens to provide comfortable writing conditions, but among them, there are only a few improvements regarding ballpoint pen tips. In other words, this ballpoint pen tip provides essential factors for realizing a comfortable writing condition, such as improving ink tracking while writing and preventing ink from falling when the ball is left facing upward. This is because it is a related structure.

In order to improve ink followability, ink guiding pores (capillary holes) related to the ink supply mechanism from the ink storage section
Many of them concern the structure of ink guide grooves (ink channels), and improvements to ink guide grooves and ball seats that support balls have been proposed as measures to prevent ink from falling. As described above, various improvements have been proposed in the past regarding ballpoint pen tips that provide comfortable writing conditions, but it is difficult to see anything close to perfect being realized at present.

The present invention has been made in view of the state of the prior art, and includes forming a portion at the tip of the caulked portion of the chip to promote the return phenomenon of ink, and at the same time, forms a portion for promoting the return phenomenon of ink at the tip of the caulked portion. This aims to achieve the intended purpose by forming an ink storage section that temporarily stores the ink.

"Means for Solving the Problems" The present invention solves the above-mentioned problems related to ballpoint pen tips by providing a first method that creates an outward opening angle between the tip's tip's tip and the ball. To solve this problem, a gap is formed, and a second gap is formed slightly below the gap between the inner wall of the fastening part and the ball.

"Function J "Example" Hereinafter, the working examples of the present invention will be described in detail with reference to the drawings, and the effects thereof will be explained.

The ballpoint pen tip 1 supports a ball B with a ball seat 4 that communicates with an ink guiding pore 2 through an ink guiding groove 3, and also traps dirt. After the ball B is supported on the ball seat 4 of the ballpoint pen tip 1, the outer circumferential surface of the ballpoint pen tip 1 is caulked by an appropriate means such as a roller R in order to prevent the ball from falling off. The ballpoint pen tip 1 is characterized in that during the caulking process, the inclination angle of the outer peripheral surface 1a of the tee is specified, and in the caulking process, it is caulked twice at a predetermined inclination angle.

Reference numeral 5 denotes a first gap formed between the tip 6a of the caulking portion 6 and the ball B, and the tip thereof is opened outward. Further, a second gap 7 is formed between the caulking inner wall 6b and the ball B at a portion located slightly below the first gap 5. Note that 3 is an ink guide groove provided in the ball receiving seat 4 as described above, and communicates with the large diameter part 2a of the ink guide pore 2. The ink that adheres to the ball B from the ink guide hole 2 through the ink guide groove 3 of the ball receiver is transferred to the writing material such as paper by the rotational action of the ball B, but all of the attached ink is not transferred. However, the ink remaining on the ball surface without being transferred is transferred to chip 1 again by the rotating action of ball B.
I need to go back inside. In this case, the existence of the first gap 5 that opens the tip outward promotes a smooth ink return phenomenon, and a large amount of ink may adhere to the writing material during writing or may occur later. Bad money that obstructs the flow of ink that follows will be wiped out.

Further, a second cavity 7 formed between the caulking part inner wall 6b and the ball B at a portion located slightly below the first cavity 5 functions to temporarily store the returning ink. This not only improves ink followability during writing, but also ensures smooth ink flow during initial writing even after a long period of deliberate use without use.

As mentioned above, this second cavity 7 is formed at a location located slightly below the first cavity 5, but the distance between the two is not necessarily constant, and the present invention is the main target of μ. When using balls B having a diameter of 0.5 mm, it can be said that the preferred separation distance is approximately 0.15 mm.

Thus, the ballpoint pen using the ballpoint pen tip 1 according to the present invention showed an approximately 65% increase in ink consumption compared to the conventional ballpoint pen, and the defective rate in terms of ink leakage was halved. .

The table below shows the comparative examples.

Jar legend: Line side: A phenomenon in which handwriting breaks.

Shading: A phenomenon caused by the amount of ink coming out depending on the direction when writing a circle, etc.

Fading: A phenomenon in which handwriting becomes blurred. Spot unevenness: A phenomenon in which handwriting appears scattered like stepping stones due to the uneven amount of ink adhering to the circumference of the circle.

Next, a method for manufacturing the glass pen tip 1 according to the present invention will be explained based on FIGS. 2 to 4.

The chip 1 that holds the ball B has its outer peripheral surface 1a formed at an inclination angle of 25 degrees to 40 degrees. Next, after the ball B is mounted, caulking is performed on the outer peripheral surface 1a of the chip.

The caulking process is carried out twice by the caulking roller R as shown in the previous section. First, the first caulking process is performed at a relatively steep angle of 50 degrees to 70 degrees, and then the caulking process is performed again on this caulking part X. A second caulking process is performed at a relatively gentle angle of inclination of 35 degrees to 55 degrees.

Chip outer circular surface 1a formed by the first caulking process
The caulking part
Due to the caulking process, the new caulked portion 6 is deformed by degrees Celsius, and a new caulked portion 6 is formed, but at this time, a first gap portion 5 that opens outward is formed between the leading edge portion 6a and the ball B. At the same time, a portion slightly below the first gap portion 5 is bulged out, and a second gap portion 7 is formed between the caulking portion inner wall 6b and the ball B at this portion.

Various combinations of the angle of inclination of the outer circumferential surface 1a of the ball holder 1 and the first and second angles of inclination in the caulking process are possible, and the corresponding effects can be achieved. If the improvement result is greater than the numerical value compared to the conventional product, specify the inclination angle of the chip outer peripheral surface 1a to 30 degrees, set the inclination angle of the first caulking process to 60 degrees, and set the inclination angle of the second caulking process to 30 degrees. It was found that the inclination angle of the treatment was specified in each case at 44 degrees.

"Effects of the Invention" As described above, the present invention specifies the inclination angle of the outer circumferential surface of the chip and performs caulking twice at a slow and steep inclination angle. A first cavity is formed between the inner wall of the caulking part and the ball, and a second cavity is formed between the inner wall of the caulking part and the ball by bulging out a portion slightly below from this cavity/gap. Since the ball is formed by forming a part, it facilitates the smooth return of ink during writing, and the part near the tip of the ball is a temporary storage area for ink, which improves the tracking of ink. A remarkable improvement in performance has been observed, and the mutual effect of the two factors has made it extremely easy to realize a ballpoint pen tip that provides comfortable writing conditions.

[Brief explanation of drawings]

Fig. 1 is a partially omitted side cross-sectional view illustrating the main parts of the ballpoint pen tip according to the present invention, and Figs. 2 to 4 illustrate the manufacturing process of the ballpoint pen tip, and Fig. 2 shows the caulking process. Figure 3 shows the state after caulking has been performed at a relatively steep angle of inclination, and Figure 4 shows the state before the 3rd stage.
This figure shows a state in which caulking is to be performed on the caulking processing section at a relatively gentle inclination angle. 1... Ballpoint pen tip, 2... Ink guiding pore,
3... Ink guide groove, 4... Ball catch, 5...
1st cavity part, 6... Caulked part, 6a... Cutting edge part, 6b... Inner wall part, 7... Second cavity part, B...
ball.

Claims (2)

[Claims] (1) In a ballpoint pen tip that holds a ball and is caulked to the ball, a first gap opening outward is formed between the tip of the caulking part and the ball. At the same time, a ballpoint pen tip is characterized in that a second gap is formed between the ball and the inner wall of the caulking part located slightly below the gap. (2) The outer peripheral surface of the chip is formed with an inclination angle of 25 degrees to 40 degrees, and a first caulking process is performed on the outer peripheral surface of the chip with a relatively steep inclination angle of 50 degrees to 70 degrees, and then this caulking treatment section A method for manufacturing a ballpoint pen tip, comprising performing a second caulking process with a relatively gentle slope at an inclination angle of 35 degrees to 55 degrees.