JP5666363B2 - Fountain pen and its manufacturing method - Google Patents

Description

  The present invention relates to a fountain pen, and more particularly, to a fountain pen that has a small pen body and fixes the pen body to a pen core.

  Conventionally, the structure of a general fountain pen is that the ink in the ink container provided inside the shaft cylinder is supplied to the pen body by a pen core inserted into the opening formed in front of the shaft cylinder, and the pen body is written. It has a structure that allows writing at the edge. In this structure, the ink flows to the front of the pen core due to the capillary force of the ink circulation groove provided on the pen core, and the ink is penned by the slit capillary force formed on the pen body adjacent to the opening of the ink circulation groove. It is possible to write by flowing to the writing end in front of the body. Therefore, after the slit is formed in the pen body, the writing end divided by the slit is moved closer to each other so that the pen body can obtain an appropriate capillary force. While attached to the cylinder, the pen core made of a resin material is heated to soften it, and the pen core is made to conform to the shape of the pen body made of metal with the writing edge aligned. . Therefore, in order to soften the resin material by heating and to make the pen core easily conform to the shape of the pen body, a resin material having a relatively low softening temperature such as ABS resin should be used as a material for forming the pen core. There are many. In many fountain pens, as described in Japanese Patent Application Laid-Open No. 2001-138585, when the pen body is attached, an extended portion extending from the back of the pen body is sandwiched between the pen core and the opening of the shaft cylinder. The mounting method of fixing with is adopted.

  By the way, in a fountain pen with a small pen body as disclosed in Japanese Patent Application Laid-Open No. 2002-347389, the pen core is sandwiched between the bent portion formed on the back side of the axial center portion of the pen body and on both sides of the main body portion. In such a fountain pen configuration, the pen core made of a thermoplastic resin material is heated with the pen body mounted on the pen core and the shaft tube. It is necessary to make the pen core shape conform to the shape of the pen body made of metal that has been softened and written at the end of the writing, and the pen body is molded with a resin material with a low softening temperature such as ABS resin. It is better in that the pen core is easily adapted to the shape of the pen body. However, in the structure where the pen core is held and fixed so as to be held by the pen body, if the pen core is a resin material with a low softening temperature, the pen core cannot support the holding force of the pen body, and it is used. In some cases, the pen body may come off the pen core. In order to make it difficult for the pen body to come off the pen core, when a resin material with a relatively high softening temperature such as AS resin is used as the material of the pen core, heating to adapt the pen core to the shape of the pen body. It is necessary to set the temperature higher, the workability deteriorates, and there is a risk that undesired local deformation of the pen core will occur due to the high heating temperature.

Japanese Patent Laid-Open No. 2001-138585 JP 2002-347389 A

  The object of the present invention is to make the pen core shape smaller than the pen body shape even in a fountain pen that is a pen body mounting structure in which the pen body is small and the pen body is nipped and fixed so as to embrace the pen core. It is to obtain a fountain pen with a structure that allows easy processing to be adapted and prevents the pen body from coming off the pen core.

The present invention
“ 1. The pen core is sandwiched and fixed between the back surface side of the shaft center portion of the pen body and the back surface side of the bent portion formed on both sides, and the rear portion of the pen core is the front end opening of the shaft tube. A fountain pen with a structure that is inserted into and fixed to the pen, and the pen core is molded from a polymer alloy of ABS resin and acrylic resin, and heat treatment is performed to change the pen shape from the softness of the ABS resin. A fountain pen with a structure that supports the holding force of the pen body due to the hardness of the acrylic resin and the core is familiar.
2. The pen core is sandwiched and fixed between the back surface side of the shaft center portion of the pen body and the back surface side of the bent portion formed on both sides, and the rear portion of the pen core is inserted into the front end opening of the shaft tube. A method for manufacturing a fountain pen with a structure to be fixed , wherein the pen core is molded by a polymer alloy of ABS resin and acrylic resin ,
(A) forming a slit from the writing end side in the axial center of the pen body;
(B) forming a slit capable of flowing ink by capillary force by moving the slit formed in the pen body from the left and right toward the center;
(C) A state in which the pen body and the pen core are mounted on the pen core so that the ink flowing into the ink circulation groove of the pen core is caused to flow by capillary force in the pen body. Thus, the back surface of the pen body is pressed against the surface of the pen core so that there is no gap between the two. And a step of pushing the writing end of the pen body to be opened,
(D) performing a heat treatment to plastically deform the tip of the pen core in a direction opposite to the pen body, and returning the pen body to the state formed in the step (b);
The fountain pen is manufactured by the hardness of the acrylic resin constituting the polymer alloy that forms the pen core, so that the pen core supports the holding force of the pen body and the pen body is not easily detached from the pen core. Method. It is.

  The present invention is characterized in that the pen core is formed of a polymer alloy, and as the polymer alloy in the present invention, it is important to use a synthetic resin material formed by mixing a plurality of synthetic resins having different properties. There is, for example, a synthetic resin material in which a synthetic resin that increases the strength for retaining the shape and a synthetic resin that is easily softened by heating are mixed.

  According to the fountain pen of the present invention, even if the pen body is small and the pen body is held and fixed so as to embrace the pen core, the pen end is processed to make the pen end. It is possible to obtain a fountain pen having a structure in which the shape of the pen core is easily adjusted to the shape of the pen body made of metal and the pen body is not easily detached from the pen core.

FIG. 1 is a perspective view showing the main part of the fountain pen of the present invention. FIG. 2 is an exploded view of FIG. FIG. 3 is a diagram illustrating a process of processing a pen body. FIG. 4 is a diagram showing the next step of FIG. FIG. 5 is a diagram illustrating a state in which the pen body is mounted on the pen core. FIG. 6 is a side view showing a state in which the pen body is mounted on the pen core. FIG. 7 is a front view of FIG. FIG. 8 is a diagram showing a state in which the writing end is immersed and heated in hot water. FIG. 9 is a side view showing a state in which the writing end is immersed in hot water and heated, and the pen core is adapted to the shape of the pen body. FIG. 10 is a diagram of FIG. 9 viewed from the front.

  Next, the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples. In addition, the same members and the same parts in the drawings are denoted by the same reference numerals.

FIG. 1 is a perspective view of the main part of the fountain pen of this embodiment, and FIG. 2 is an exploded view thereof.
A fountain pen 1 shown in FIG. 1 has a pen body 2 attached to a pen core 3, and a rear portion 3 b of the pen core 3 provided with a comb groove 3 a is inserted into a front end opening 4 a of the shaft cylinder 4. The fixing structure of the pen body 2 and the pen core 3 according to the present embodiment will be described in detail with reference to FIG. 2. The back side of the axial center portion 2 a of the pen body 2 is brought into contact with the front surface of the pen core 3, thereby The back side of the bent part 2b formed on both sides of the pen is brought into contact with the step part 3c formed on both front sides of the pen core 3, and the pen body 2 is clamped and fixed so as to hold the pen core 3. Further, a slit 2c is provided in the shaft center portion 2a of the pen body 2, and in the assembled state as shown in FIG. 1, the opening of an ink flow groove (not shown) formed in the pen core 3 is the slit 2c of the pen body 2. The ink (not shown) accommodated in the shaft cylinder 4 moves forward by the capillary force of the ink circulation groove of the pen core 3, and moves forward by the capillary force of the slit 2c of the pen body 2. It is possible to write with the writing end 2d.

  Next, processing of the pen body will be described with reference to the drawings. FIG. 3 is a step of forming a slit in the axial center portion 2a of the pen body 2 with the rotating grindstone 10 from the writing end 2d side toward the round hole 20 side. FIG. 4 shows a process of forming a slit that allows ink to flow by capillary force by moving the slit 21 formed in the pen body 2 from the left and right toward the center. FIG. 5 is a process of attaching the pen body 2 to the pen core 3, and the pen body 2 from the front of the pen core 3 so that the slit 2 c formed in the pen body 2 coincides with the position of the ink flow groove 3 d of the pen core 3. It is the process of attaching. Incidentally, the pen body 2 and the pen core 3 are arranged so that the ink flowing through the ink circulation groove 3d of the pen core 3 is reliably flowed to the slit 2c of the pen body 2 by capillary force. The pen body 2 is pressed firmly against the surface of the pen core 3 so that there is no gap between them. That is, the back surface of the pen body 2 is against the pen core 3 surface. The contact is made by the elastic force of the body 2. As a result, when the pen body 2 is simply mounted on the pen core 3, a force in the direction of the arrow L acts on the pen body 2 by the surface of the pen core 3 as shown in FIG. Thus, the writing end 2d of the pen body 2 is pushed open in the direction of the arrow M, and the action of the capillary force of the slit 2c becomes dull.

  In order to return the pen body 2 in the state shown in FIG. 7 to the state in which the writing end 2d shown in FIG. 5 is brought close to the pen body 3, as shown in FIG. The pen core 3 is softened by being immersed in 12 and heated, and the shape of the pen core 3 is adjusted to the shape of the pen body 2. In this embodiment, the pen body 2 is formed of a stainless steel material, and the pen core 3 is formed of a polymer alloy of ABS resin and acrylic resin (Stylac AT-15 manufactured by Asahi Kasei Corporation), and the softness of the ABS resin. The pen core 3 is easily adapted to the shape of the pen body 2, and by performing the heat treatment shown in FIG. 8, the tip of the pen core 3 is plastically deformed in the direction of arrow N as shown in FIG. As shown in FIG. 5, the slit 2c of the pen body 2 returns to the same state as the slit 2c shown in FIG. 5, and the capillary force can be applied, and the pen core 3 is made of the pen body 2 due to the hardness of the acrylic resin. The pinching force can be supported, and the pen body 2 is not easily detached from the pen core 3.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a fountain pen having a pen body mounting structure in which the pen body is small and is held and fixed so that the pen body holds the pen core.

1 ... fountain pen,
2 ... pen body, 2a ... axial center part, 2b ... bent part, 2c ... slitting, 2d ... writing end,
20 ... round hole, 21 ... slit,
3 ... Pen core, 3a ... Comb groove, 3b ... Back part, 3c ... Step part, 3d ... Ink distribution groove,
4 ... Shaft cylinder, 4a ... Front end opening.

Claims (2)

The pen core is sandwiched and fixed between the back surface side of the shaft center portion of the pen body and the back surface side of the bent portion formed on both sides, and the rear portion of the pen core is inserted into the front end opening of the shaft tube. A fountain pen with a structure to be fixed, wherein the pen core is molded by a polymer alloy of ABS resin and acrylic resin, and the pen core is plastically deformed into the shape of the pen body by heat treatment from the softness of the ABS resin, A fountain pen with a pen core that supports the clamping force of the pen body due to the hardness of acrylic resin. The pen core is sandwiched and fixed between the back surface side of the shaft center portion of the pen body and the back surface side of the bent portion formed on both sides, and the rear portion of the pen core is inserted into the front end opening of the shaft tube. A method for manufacturing a fountain pen with a structure to be fixed , wherein the pen core is molded by a polymer alloy of ABS resin and acrylic resin ,
(A) forming a slit from the writing end side in the axial center of the pen body;
(B) forming a slit capable of flowing ink by capillary force by moving the slit formed in the pen body from the left and right toward the center;
(C) A state in which the pen body and the pen core are mounted on the pen core so that the ink flowing into the ink circulation groove of the pen core is caused to flow by capillary force in the pen body. Thus, the back surface of the pen body is pressed against the surface of the pen core so that there is no gap between the two. And a step of pushing the writing end of the pen body to be opened,
(D) performing a heat treatment to plastically deform the tip of the pen core in a direction opposite to the pen body, and returning the pen body to the state formed in the step (b);
The fountain pen is manufactured by the hardness of the acrylic resin constituting the polymer alloy that forms the pen core, so that the pen core supports the holding force of the pen body and the pen body is not easily detached from the pen core. Method.

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