JPS59135197A - Method of molding point of note - 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 method for forming a tip of a writing instrument.

Brush tips for writing instruments such as brush pens are formed by fixing the rear end of the brush bristle bundle by welding or adhesive, and are fixed to the tip of the barrel, but ink from the ink chamber inside the barrel is absorbed into the tip of the tip of the tip. In order to ensure sufficient ink transmission, an ink conducting hole is often provided from the rear end surface of the brush tip to the vicinity of the tip. The ink conducting holes can be formed by fixing the entire rear end surface of the brush bristle bundle and then drilling the holes, but this method has a problem in that it requires many steps and is time-consuming. Therefore, a center hole that does not participate in welding is provided on the pressing surface of the welding member that welds by pressing it against the rear end surface of the brush bristle bundle, and this hole is pressed against the rear end surface to avoid welding only the center part. It has been proposed to subsequently remove the animal hair in the area to form ink-conducting holes.

However, this method has the problem that if the bathing conditions such as heating temperature and suppression time are slightly unbalanced, the boundary between the welded area and the non-welded area will change greatly, the size of the ink passage hole will change, and the quality will not be stable. was there.

Therefore, the present invention provides a simple method to achieve a fixed size.

The purpose is to provide a method for forming a brush tip of a writing instrument that can form ink conducting holes, and the structure is such that a brush bundle is filled into a bottomed cylindrical container with the rear end surface slightly protruding from the container opening. , a welding member having a cooling part disposed at the center of the suppressing surface and a heating part provided on the outer periphery of the welding member through a heat insulating material is pressed and welded to the rear end surface of the brush bristle bundle, and the brush bristle bundle is removed from the container. The feature is that the brush is taken out and the bristles of the non-welded part at the center are removed to form an ink conducting hole.

Embodiments of the present invention will be specifically described below with reference to the drawings.

The container 1 has a cylindrical shape with a bottom whose inner diameter and depth are equal to the outer diameter and length of the brush tip 2 to be formed, and the rachis bundle 4 is dropped into the container 1 and filled. , The brush bristles are made of polyester resin or acrylic resin, and the lower tip is the tip?
It has an A'z shape. The rear end surface 41 of this bristle bundle 4
protrudes from the opening of the container 1, and the welding member 5 is pressed and welded to this rear end surface 41, thereby forming a welding layer 6.

Here, as shown in FIGS. 1 and 2, the welding member 5 is provided with a cooling part 51 in the center of which a thin water cooling pipe is bent into an annular shape, and the outer diameter of the cooling part 51 is the inner diameter of the ink passage hole 6 to be formed. The size is equivalent to that of A heat insulating material 52 is interposed around the outer periphery of this cooling 51, and a heating section 53 having a built-in heater is further provided. Then, water is passed through the water cooling pipe,
If the heater is energized to raise the temperature of the heating part 53 to a predetermined temperature for welding, the welding layer 6 is formed only in the part where the heating part 53 is pressed, and the part corresponding to the cooling part 51 is not welded.

Once this welding layer 6 is formed, the hair balm bundle 4 is integrated and taken out of the container 1, and the central part of the company housing that is not covered by the bath is removed, leaving a blank space. Since the tips of the brush bristles are each tapered, the tips of the brush bristle bundles 4 are
When hardened with a non-urea resin or the like, a tapered brush tip 2 having an ink conducting hole 3 from the rear end to the vicinity of the tip is completed. When this brush tip 2 is fixed to the tip of the barrel and used for writing, the ink passage hole 3 is filled with ink, and a sufficient amount of ink can be supplied even when writing bold letters.

In this way, the present invention first uses a cylindrical container with a bottom, so that just by dropping the bristles bundle into the container, one brush tip is filled with brush bristles. There is no. Then, a cooling part was placed in the center of the suppressing surface of the welding member, and a heating part was provided on the outer periphery of the cooling part through a heat insulating material, so that when pressed with this, the brush bristles rise to the welding temperature and the string bristles do not rise in temperature. The boundary between the Therefore, since ink conducting holes of a constant size can always be obtained, it is possible to provide a method for forming a brush tip of a writing instrument with a simple structure and stable quality.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the welding member, Figure 2 is a perspective view,
5 to 5 are process explanatory diagrams of an embodiment of the present invention. 1. Container 2... Brush tip 3... Ink conduction hole 4... Brush bundle bundle 5... Welding member 6. J. Welding layer 41... Rear end surface 51... Cooling Part 52...Insulating material 53...Heating part Applicant Sailor Fountain Pen Co., Ltd. Agent Patent Attorney Toranosuke Tahara Figure 1 Figure 3 Figure 2 Figure 4 ・Figure 5

Claims (1)

[Claims] The brush bristle bundle is filled into a bottomed cylindrical container with its rear end surface slightly protruding from the container opening, and a cooling part is anti-α in the center of the pressing surface, and a heating part is attached to its outer periphery via a heat insulating material. Pressing and welding the provided welding member to the rear end surface of the brush bristle bundle, taking out the brush bristle bundle from the container, and removing the brush bristles in the non-welded part at the center to form an ink conduction hole. A method for forming a writing instrument brush tip.