JPS608240B2 - How to make felt-tip pens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention prevents the pen nib from sinking into the barrel or coming out from the nib, making it easy to produce a pen nib of a desired shape, and allowing for long-term use. Concerning how to get a sign that will be used.

Conventionally, when making this type of signboard, a short synthetic fiber east with a tip shaped like a conical pen tip is prepared in advance, and then a synthetic resin adhesive is applied to the base of the short and small synthetic fiber east. A method has been explored for inserting and gluing the ink-storing synthetic fiber from the rear end of the rear shaft tube, and then ironing the tail plug to the rear end of the barrel tube.

However, with this method, if there is a discrepancy between the thickness of the base of the pen nib and the inner diameter of the nib, or if the adhesive is not properly applied, the nib may sink into the barrel during use. Not only does it have the disadvantage of falling off or coming off, but there is also the risk of it coming off due to aging of the adhesive, and when manufacturing each pen, it takes time and effort to insert the base with the tip into the small diameter tip of the shaft. There are many disadvantages such as the trouble of cleaning the adhesive and also the fact that the pen nib becomes dirty or loses its shape.

In order to eliminate the above-mentioned disadvantages, the present invention proposes the following simple and efficient manufacturing method as a result of studies. An example will be described below.The outer diameter is approximately 6 skins from the rear end of a synthetic resin shaft cylinder 2 with a length of about 11 arcs on the inner diameter 7 side, which has a bag tip part 1 with an inner diameter of approximately 4 ribs at the tip. Insert a so-called tip of synthetic fiber Higashi 3 cut into approximately 3 lengths, and press it with a pusher or the like to make its tip protrude approximately 8 points from the tip of the shaft point 1, and then After inserting the protruding part 3 into a curing agent of melamine-based synthetic resin and coating it with the curing agent S, the protruding part 3 is left to dry naturally for about 4 hours.Then, the protruding part 3 is cut into a semi-conical pen tip P using a grinder or the like. An ink storage synthetic fiber east 4 in the shape of an oblong port, consisting of a synthetic fiber east with an outer diameter of about 6 ribs and a length of about 8 cm, is not cut, but is impregnated with ink. Insert it and bring its tip into contact with the inner end of the nib base in the aforesaid nib part, and airtightly attach a tail plug 5 made of synthetic resin to the rear end of the rear axle tube 2 to complete the process. It is something.

As described above, the present invention involves inserting a short annular synthetic fiber so-called tip from the rear end of the ball tube and pushing it in so that its tip protrudes a required length from the tip of the shaft tip. This method eliminates the troublesome work of inserting each nib one by one into a small-diameter nib, as in the conventional method, and the hassle of inserting the nib one by one into a bag nib. The nib will not sink into the barrel or come out due to errors in the inner diameter and the outer diameter of the nib base, poor adhesive application, aging, etc., and the compressed tip base will always keep the nib at the tip. Since the nib is tightly held in the nib and then ground into the desired nib shape, there is no need to worry about staining or deforming the nib, and there is no need to apply adhesive or clean it. It is a simple yet extremely advantageous invention that has the advantage of being able to inexpensively and efficiently produce a sign ben that can be used for a long time without wasting unnecessary labor.

[Brief explanation of the drawing]

The figures show examples, and Fig. 1 is a side view of the tip, and Fig. 2 is a side view of the tip. Fig. 3 is an enlarged longitudinal side view of the main part in a state where the tip has been cut off, Fig. 4 is an enlarged longitudinal side view of the main part of the same as above with the tip tip shaved off, and Fig. 4 is a longitudinal side view of the entire sainben completed according to the present invention. be. 1 is the tip of the ball, 2 is the ball tube. 3 is the short circular synthetic fiber east (
Tip) The mother is the ink storage synthetic fiber, 5 is the tail plug, S is the hardening agent, and P is the pen tip. Younger brother 78 ken 28 Dotazu bet 4

Claims (1)

[Claims] 1. From the rear end of a synthetic resin shaft cylinder with a shaft tip formed at the tip, insert a short circular ■-shaped synthetic fiber bundle that has been previously cut into short pieces and has an outer diameter slightly larger than the inner diameter of the shaft tip. The tip is pressed to protrude from the tip of the shank, and then a curing agent such as melamine-based synthetic resin is soaked into the protrusion, and after thoroughly drying, the protrusion is cut into the desired pen tip shape. Then, separately, an oval ■-shaped ink storage synthetic fiber bundle impregnated with ink is inserted, and its tip is brought into contact with the inner end of the short circular ■-shaped synthetic fiber bundle in the shaft tip portion. A method for manufacturing a felt-tip pen, characterized in that a tail plug made of synthetic resin is tightly fitted to the rear end of a rear barrel.