JP2002254886A - Pencil and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pencil which has an originality as a goods and is capable of certainly enhancing the value of a goods as well as a manufacturing method therefor. SOLUTION: This pencil 1 has a lead 2 built in the center and a pencil barrel 13a whose sectional shape is circular, with a recessed groove 3a extending, in the circumferential direction, on the outer peripheral face of the pencil barrel 13a. This recessed groove 3a is arranged at least in a part of the axial direction of the pencil barrel 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pencil whose pencil shaft has a circular cross section and a method of manufacturing the pencil.

[0002]

2. Description of the Related Art In general, a pencil (round shaft pencil) is known in which a pencil shaft having a pencil core at the center has a circular cross section.

[0003] Such a pencil is manufactured by the following method. First, a concave groove for mounting a pencil lead is formed on a pair of shaft plates forming a shaft cylinder. Next, a pencil lead is mounted in each of these grooves, and the respective shaft plates are bonded to each other. Thereafter, the laminated shaft plate is cut to form a pencil shaft, and a paint is applied to the outer peripheral surface of the cut pencil shaft. In this way, a pencil is manufactured.

[0004]

In a conventional pencil, a paint having a different paint color is applied to the outer peripheral surface (having a uniform outer diameter) of the pencil shaft, or a color pattern is formed by the paint. By doing so, the design was enhanced. For this reason, there has been no novelty in the product, and there has been a demand for an improvement that adds novelty and enhances the product value.

[0005] The present invention has been made in order to meet such a demand, and an object of the present invention is to provide a pencil and a method of manufacturing the same, which can provide novelty as a commercial product and thus can surely increase the commercial value. It is assumed that.

[0006]

A pencil according to the present invention made to achieve the above-mentioned object is a pencil having a circular cross section of a pencil shaft provided with a pencil lead at the center thereof, A groove extending around the axis is formed on the outer peripheral surface of the pencil shaft, and the groove is arranged at least in a part of the pencil shaft in the axial direction. With such a configuration, the groove formed on the outer peripheral surface of the pencil shaft is visually recognized as a three-dimensional pattern. Therefore, compared with the case of a pencil shaft having a uniform outer diameter, it is possible to impart novelty as a product, and it is possible to surely increase the commercial value. In addition, when used as a pencil, the groove can function as a non-slip.

[0007] In this case, it is desirable that the concave groove comprises a plurality of annular grooves or spiral grooves. With such a configuration, the annular groove or the spiral groove is visually recognized as a three-dimensional pattern. Further, the concave groove is arranged in the entire axial direction of the pencil shaft. With this configuration, the groove is visually recognized as a three-dimensional pattern from the start of use to the end of use.

Further, a configuration in which a buffer ring having a convex portion fitted into the concave groove is mounted on the outer peripheral surface of the pencil shaft may be adopted. With such a configuration, it is possible to absorb the impact applied to the finger from the pencil shaft during use.

On the other hand, a method of manufacturing a pencil according to the present invention is directed to a method of manufacturing a pencil having a pencil core provided with a pencil core at its center and having a circular cross-sectional shape of a pencil shaft, wherein the pencil shaft has a pair of barrels. Forming a groove for mounting the pencil lead on the shaft plate, mounting the pencil core in both grooves and bonding the shaft plates to each other, and rotating the shaft tube. A step of cutting the bonded shaft plate with a cutter to form the pencil shaft, a step of forming a groove extending around the axis on a part of the outer peripheral surface of the pencil shaft, and forming the groove. Applying a paint to the outer peripheral surface of the pencil shaft.

According to this method, the groove formed on the outer peripheral surface of the pencil shaft is visually recognized as a three-dimensional pattern. Therefore, compared with a pencil shaft with a uniform outer diameter,
It is possible to obtain a pencil which can give the novelty as a product and can surely increase the commercial value.

Further, the concave groove is formed by grinding in a tangential direction perpendicular to a fiber of wood constituting the barrel. With such a method, it is possible to reliably suppress the occurrence of fiber burrs protruding from the inner surface (including the bottom surface) of the concave groove.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pencil according to the present invention and a method for manufacturing the same will be described below with reference to the embodiments shown in the drawings. First, a pencil will be described with reference to FIG. Figure 1
1 is a perspective view showing a pencil according to a first embodiment of the present invention. In the figure, a pencil denoted by reference numeral 1 has a pencil lead 2 at the center and a shaft cylinder 3 on the outer periphery, and is formed entirely in a columnar body (pencil shaft) having a circular cross section. The outer peripheral surface of the pencil (pencil shaft) 1 is formed by cutting and grinding the wood constituting the barrel 3 with a rotary cutter (shown in FIG. 5) and a grinder (shown in FIG. 6).

On the outer peripheral surface of one end of the pencil 1 (shaft tube 3), a plurality of annular concave grooves 3a extending around the axis (circumferential direction) are formed. Similarly, a plurality of annular grooves 3a extending around the axis are formed on the outer peripheral surface of the other end. These concave grooves 3a have an inner surface (including a bottom surface) formed of a gentle curved surface, and are arranged in parallel with a part (both ends) of the pencil 1 in the axial direction. In addition, as a material of the shaft cylinder 3, inexpensive wood such as softwood, hardwood or southern seawood is used.

Further, on the outer peripheral surface of the pencil 1, a coating film 4 is formed over the entire surface. The coating film 4 is configured to be able to shield the base (wood grain, wood color, etc.). The groove 3a is configured to be visually recognized as a three-dimensional pattern and to function as a non-slip. As a material of the coating film 4, an enamel lacquer is used for the undercoat / intermediate coat, and a clear lacquer is used for the overcoat. Further, the number of times of application differs depending on the paint color. For example, when a white paint is used, the concealing property of the pigment is high, so that a relatively small number of times is sufficient. When a light-colored paint is used, the shielding property is low, and the number of times of the light-shielding paint increases.

In this embodiment, the case has been described in which the anti-slip function is provided by the concave groove 3a, but the buffer ring 21 is slid on the outer peripheral surface of the pencil 1 as shown in FIG. By freely mounting, it is possible to absorb the impact applied to the finger from the pencil 1 during use. In this case, the buffer ring 21 has a convex portion 21a fitted into the concave groove 3a via the coating film 4, and is entirely formed of rubber or the like. When the groove 3a is formed in the entire axial direction, the buffer ring 21 can be arranged at an appropriate position by sliding the buffer ring 21 according to the use state of the pencil 1. .

In this embodiment, the case where the concave groove 3a is an annular groove has been described. However, the present invention is not limited to this, and may be a spiral groove as shown in FIG. The same effect can be obtained. Further, in the present embodiment, the case where the concave groove 3a is arranged at least in a part of the pencil shaft 1 in the axial direction has been described. It may be arranged. In this case, the groove 3a is visually recognized as a three-dimensional pattern from the start to the end of use of the pencil.

Next, a method of manufacturing the pencil constructed as described above will be described with reference to FIGS. FIGS. 4A to 4G are process diagrams shown for explaining a pencil manufacturing method according to the embodiment of the present invention. FIG. 5 (a)
FIGS. 4A and 4B are a front view and a cross-sectional view showing a rotary cutter used in a step of forming a pencil shaft in the method for manufacturing a pencil according to the embodiment of the present invention. FIG. 6 is a front view showing a grinding machine used in a pencil shaft grinding step in the pencil manufacturing method according to the embodiment of the present invention. FIGS. 7A and 7B are cross-sectional views illustrating a coating apparatus used in a pencil shaft coating step in the pencil manufacturing method according to the embodiment of the present invention. 4 to 7, the same reference numerals are used for members that are the same as or equivalent to those in FIG.

The method of manufacturing a pencil according to the present embodiment includes “groove processing for mounting a pencil lead”, “adhering step of a shaft plate”, “step of forming a pencil shaft”, and “grinding of a pencil shaft (concave groove). Steps of “formation” step and “painting step of pencil shaft” are sequentially performed, and these steps will be sequentially described.

"Groove processing for mounting a pencil lead" As shown in FIG. 4A, a pair of shaft plates 10 and 11 forming the shaft cylinder 3 are provided with
A plurality of grooves (three in each shaft plate in the figure) are formed with semicircular concave grooves 10a and 11a for mounting the pencil lead 2 having a circular cross section. Each of the concave grooves 10a, 11a is
It is formed parallel to 11 fibers. In this case, each shaft plate 1
As materials 0 and 11, inexpensive wood such as softwood, hardwood or southern wood is used. In addition, each groove 10
Since a and 11a have a semicircular cross section, each shaft plate 10, 1
When they are overlapped with each other, a space having a circular cross section is formed between the two shaft plates 10 and 11, and the pencil lead 2 fits into this space.

[Attaching Process of Shaft Plates] As shown in FIG. 4B, the pencil core 2 is mounted in the double concave grooves 10a and 11a, and the shaft plates 10 and 11 are attached to each other.
The bonded shaft plate 12 is formed. In this case, each shaft plate 1
0 and 11 have the grain directions coincide with each other and overlap with each other via an adhesive.

"Pencil Shaft Forming Step" First, a laminating shaft shown in FIG. 4B is used by using a rotary cutter 51 for forming a shaft cylinder which rotates in the direction indicated by the arrows in FIGS. By moving the plate 12 along the axis of the pencil lead 2 (parallel to the direction of the fiber), a part of the plate 12 (half of the shaft cylinder is Cut the rest of 11). Next, after turning over the bonded shaft plate 12a remaining after cutting shown by a solid line in FIG.
As shown by a solid line in FIG.

Although the pasting shaft plates 12, 12a are moved in parallel with the axis of the pencil lead 2 during cutting, the rotating cutter 51 may be moved, or the rotating cutter 51 and the pasting shaft plates 12, 12a may be moved. May be moved in opposite directions. That is, in short, the laminated shaft plates 12, 1
2a and the rotary cutter 51 are relatively moved parallel to the axis of the pencil lead 2 in a direction approaching each other.

"Pencil shaft grinding (concave groove formation) process" FIG. 4
As shown by a two-dot chain line in (e), the outer peripheral surface of the pencil shaft 13 is ground by a grinder 61 shown in FIG. 6 in a tangential direction perpendicular to the wood fibers constituting the barrel 3 (pencil shaft 13a).
At this time, as shown in FIG. 4F, an annular concave groove 3a extending in the circumferential direction is formed in a part (both ends) in the axial direction on the outer peripheral surface of the pencil shaft 13a. As a result, the outer diameter of the pencil shaft 13a whose outer peripheral surface is the groove bottom of the concave groove 3a is set to be smaller than the outer diameters of the other portions. In this case, as shown in FIG.
3 is supported. In this state, when the grinding wheel 61c is driven in the direction of the arrow s, the pencil shaft 13 rotates in the direction of the arrow n with this rotation (about 7 to about 7 per pencil shaft 13).
８０80 rotations), and as a result, the outer peripheral surface of the pencil shaft 13 is ground along the circumferential direction. Reference numeral 61b denotes an adjustment wheel that rotates in the direction of arrow m. The concave groove 3a can be formed by forming a convex portion that fits the concave groove 3a on the outer peripheral surface of the grinding wheel 61c.

As described above, when the grinding is performed using the grinding machine 61, the roundness of the shaft cylinder 3 becomes 10 μm or less, and extremely excellent smoothness, dimensional accuracy and roundness of the shaft diameter can be obtained. When the number of rotations of the pencil shaft 13 at the time of grinding is set to about 7 to 80 times per one, the amount of grinding per one blade in the grinding tool is reduced, and clogging is prevented.
Heat generation can be prevented and tool life can be extended.

"Pencil Shaft Coating Process" First, a grounded pencil shaft 13 is placed in a paint 71a of a paint tank 71 shown in FIG.
a. Next, after the dipped pencil shaft 13b is pulled out of the paint tank 71, the pencil shaft 13b is inserted through the wiper ring 72 shown in FIG. 7B. As a result, FIG.
As shown in (g), a coating film 4 having a predetermined thickness is formed on the outer peripheral surface of the ground pencil shaft 13a (shaft tube 3). Thus, the pencil 1 is manufactured.

Therefore, in the present embodiment, since the concave groove 3a formed on the outer peripheral surface of the pencil 1 (pencil shaft) is visually recognized as a three-dimensional pattern, it is compared with the case where the pencil shaft has a uniform outer diameter. In addition, the product can be given novelty, and the value of the product can be reliably increased. In the present embodiment, when used as the pencil 1, the concave groove 3a can function as a non-slip. Furthermore, in this embodiment, since the concave groove 3a is formed by grinding in a tangential direction at right angles to the wood fiber constituting the barrel 3, the fiber beam projecting from the inner surface (including the bottom surface) of the concave groove 3a is formed. Generation can be reliably suppressed.

In addition, in the present invention, the entire outer peripheral surface of the pencil shaft 13 is ground in a tangential direction perpendicular to the wood fiber, so that the outer peripheral surface of the pencil shaft 13 has good smoothness, shaft diameter dimensional accuracy, and perfect circle. The degree of quality can be obtained, and the commercial value can be further enhanced. Further, in the present embodiment, obtaining good smoothness and dimensional accuracy and roundness of the shaft diameter makes it possible to reduce the number of times of coating without deteriorating the quality of the coated appearance, thereby reducing costs. Can also be planned.

In this embodiment, each shaft plate 10,
As the material 11, inexpensive wood such as softwood, hardwood and southern seawood was used. However, the present invention is not limited to this, and expensive wood such as incense seeder may be used.
Here, when softwood, hardwood, or southern wood is used for each of the shaft plates 10 and 11, there is no difference in appearance quality in comparison with the case where expensive wood is used, and the manufacturing cost is greatly increased. Reduction can be achieved.

In the present embodiment, the pencil shaft 13
Although the case where the cutting of the bonded shaft plates 12 and 12a is performed by the single (lower) rotary cutter 51 in the forming process described above, the present invention is not limited to this, and is performed by the upper and lower two rotary cutters 51. It may be something. Thereby, in the forming process of the pencil shaft, the bonded shaft plate 1
The upside down operation of 2a becomes unnecessary.

Further, the pencil shaft 13 in the present embodiment is coated by arranging the ground pencil shaft 13a in the paint tank 71, immersing it in the paint 71a, and then immersing the pencil shaft 1 in the paint tank 71.
3b is pulled out of the paint tank 71, and then the wiper ring 72
Although the description has been given of the case where the operation is performed by inserting the information into the device, the operation may be performed as follows. That is, the ground pencil shaft 13a is arranged in the paint tank 71 and the paint 7
After being dipped in 1a, the pencil shaft 13b is inserted through a wiper 72 previously attached to the side wall of the paint tank 71 without pulling the dipped pencil shaft 13b out of the paint tank 71. By inserting the wiper ring 52, the pencil shaft 13 b is led out of the paint tank 51. In this case, in order to smoothly paint the pencil shaft 13a, it is desirable that the pencil shaft 13b be continuously passed through the wiper ring 72. As a result, in the painting process,
The operation of raising the pencil shaft 13b from the paint tank 71 is not required.

[0031]

As apparent from the above description, according to the pencil and the method for producing the same according to the present invention, the novelty can be given as a commercial product, so that the commercial value can be surely enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pencil according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a usage example in which a buffer ring is mounted on the pencil according to the first embodiment of the present invention.

FIG. 3 is a front view showing a pencil according to a second embodiment of the present invention.

FIGS. 4A to 4G are process diagrams shown for explaining a pencil manufacturing method according to the embodiment of the present invention.

FIGS. 5A and 5B are a front view and a cross-sectional view showing a rotary cutter used in a step of forming a pencil shaft in a pencil manufacturing method according to an embodiment of the present invention.

FIG. 6 is a front view showing a grinding machine used in a pencil shaft grinding step in the pencil manufacturing method according to the embodiment of the present invention.

FIGS. 7A and 7B are cross-sectional views showing a painting apparatus used in a pencil shaft painting step in a pencil manufacturing method according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pencil shaft 2 Pencil core 3 Shaft cylinder 3a Concave groove 4 Coating film 10, 11 Axis plate 10a, 11a Concave groove 12 Laminated shaft plate 12a Laminated plate after cutting 13 Pencil shaft 13a Ground pencil shaft 13b Dipped Pencil shaft 51 Rotary cutter 52 Wiper ring 61 Grinding machine 61a Support blade 61b Adjusting wheel 61c Grinding grindstone 71 Paint tank 71a Paint

Claims (7)

[Claims] 1. A pencil having a pencil core provided at a central portion thereof and having a circular cross section of a pencil shaft, wherein a concave groove extending around an axis is formed on an outer peripheral surface of the pencil shaft. The pencil, wherein the groove is arranged at least in a part of the pencil axis in the axial direction. 2. The pencil according to claim 1, wherein said concave groove comprises a plurality of annular grooves. 3. The pencil according to claim 1, wherein the groove comprises a spiral groove. 4. The pencil groove according to claim 1, wherein the concave groove is arranged in the entire axial direction of the pencil shaft.
Or the pencil according to claim 3. 5. The pencil ring according to claim 1, wherein a buffer ring having a convex portion fitted into the concave groove is mounted on an outer peripheral surface of the pencil shaft. pencil. 6. A method for manufacturing a pencil having a pencil shaft having a circular shape in cross section of a pencil shaft having a pencil core at the center thereof, wherein the pencil core is mounted on a pair of shaft plates forming a shaft cylinder of the pencil shaft. Forming the concave grooves for attaching the pencil cores in the two concave grooves and bonding the shaft plates to each other; cutting the bonded shaft plate with a rotary cutter for forming a shaft cylinder; Forming a pencil shaft extending around the axis on a part of the outer peripheral surface of the pencil shaft, and applying a paint to the outer peripheral surface of the pencil shaft having the concave groove formed thereon. And a process for producing a pencil. 7. The method for manufacturing a pencil according to claim 6, wherein the concave groove is formed by grinding in a tangential direction perpendicular to a fiber of wood constituting the barrel.