Rotary marking tool and method of marking a fastening member using the same

Abstract

To provide a rotary marking tool capable of clearly marking even a corner part of a fastening member whose size and shape are not constant, and a marking method to the fastening member using the same.SOLUTION: The rotary marking tool comprises a body 10 functioning as a grip part, a flexible marking roller 20 rotatably supported by the body 10, and an ink supply part 30 for supplying ink to the marking roller 20, wherein a marking surface 23 of the marking roller 20 is formed of a flexible non-porous material such as silicone rubber.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rotary marking tool and a method for marking fastening members using the same. [Background technology]

[0002] When fastening steel materials that make up large structures using fastening members such as bolts and nuts, a primary tightening is first performed with a specified torque, after which a linear marking is made in the axial direction of the fastening member, and then final tightening is performed. For example, the marking is made so that it spans the bolt and nut. If the marking positions on the bolt and nut are misaligned by a specified angle after final tightening, it can be confirmed that the final tightening was performed correctly. However, if the marking positions on the bolt and nut are not misaligned, it can be discovered that the fastening members have rotated together and the final tightening was not performed correctly, and the fastening can be performed again.

[0003] Traditionally, marking of such fastening members has been done manually with a pen, but in recent years, to reduce the burden on workers, a marking device has been developed, as shown in Patent Document 1. The marking device in Patent Document 1 is a roller type that marks by moving two marking rollers attached to the main body in the axial direction of the bolt.

[0004] The marking roller used here is a porous felt body impregnated with marking ink, and because it is flexible, it has the advantage of being able to mark while deforming to fit the external shape of the fastening member. However, when the marking roller is pressed against the corner of the fastening member, the marking roller is compressed and deformed, causing the ink impregnated inside to be ejected in excess, resulting in problems such as locally thick marking lines and ink dripping onto the fastening member.

[0005] Furthermore, conventional marking tools such as those shown in Patent Document 1 are specially manufactured to fit the size and shape of the fastening members. Therefore, while they are convenient for use in fastening inspection of large structures in which a large number of fastening members of the same size are used, they are difficult to use for fastening inspection of structures in which the fastening members are not of a uniform size or shape, and there are also cost issues. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2023-140412 Summary of the Invention [Problem to be solved by the invention]

[0007] The object of the present invention is to solve the above-mentioned conventional problems and to provide a rotary marking tool that can clearly mark even the corners of fastening members that are not uniform in size or shape, and a method of marking fastening members using the same. [Means for solving the problem]

[0008] The rotary marking tool of the present invention, which has been made to solve the above problems, is a rotary marking tool consisting of a main body that functions as a gripping portion, a flexible marking roller supported by the main body so that it can rotate freely, and an ink supply portion that supplies ink to the marking roller, and is characterized in that the marking surface of the marking roller is formed from a flexible, non-porous material.

[0009] It is preferable that either or both of the marking roller and the ink supply unit have an operating piece for applying ink from the ink supply unit to the marking roller. It is also preferable that the ink supply unit is an ink supply roller equipped with a roller-shaped ink pad impregnated with ink, and that the operating piece is formed integrally with the ink supply roller. It is also preferable that the marking roller and the ink supply roller are connected via a belt or gears.

[0010] Furthermore, the method for marking fasteners of the present invention, which has been made to solve the above problems, is a method for marking fasteners using a rotary marking tool as described in claim 1, characterized in that a marking roller is rotated while being in contact with the bolt in the axial direction to mark the shank of the bolt, and at the corners of the fasteners, the marking roller is pushed in by taking advantage of its flexibility to mark the corners. [Effects of the Invention]

[0011] The rotary marking tool of the present invention has a flexible marking roller rotatably attached to a main body that functions as a gripping part, making it possible to mark fasteners of various sizes and shapes. Moreover, because the marking surface of the flexible marking roller is made of a non-porous material, excessive ink is not ejected even when pressed against the corners of a fastener. This eliminates problems such as locally thick marking lines and ink dripping onto the fastener.

[0012] In addition, if the ink supply roller is configured to apply ink to the marking surface of the marking roller by rotating the operating piece, operability will be improved. Also, if the marking roller and ink supply roller are configured to be connected via a belt or gear, free rotation of each roller will be prevented, and the ink impregnated in the ink supply roller can be reliably applied to the marking surface.

[0013] Furthermore, according to the method for marking fastening members of the present invention, it is possible to mark even large fastening members neatly. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view of the appearance of a rotary marking tool according to an embodiment; [Figure 2] FIG. 1 is a plan view of a rotary marking tool according to an embodiment. [Figure 3] FIG. 2 is a perspective view of the appearance of an ink supply roller. [Figure 4] FIG. [Figure 5] FIG. 3 is a plan view showing the relationship between an ink supply roller and a marking roller. [Figure 6] 7 is a cross-sectional view taken along the line AA in FIG. 6. [Figure 7] FIG. 7 is a cross-sectional view of FIG. 6 taken along line B-B. [Figure 8] FIG. 10 is a plan view showing the relationship between an ink supply roller and a marking roller in another embodiment. [Figure 9] FIG. 1 is an explanatory diagram of a rotary marking tool in use. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of the present invention will be described below. In FIG. 1, 10 is a main body that functions as a gripping portion, 20 is a marking roller provided at the tip of the main body 10, and 30 is an ink supply roller provided inside the main body 10.

[0016] The main body 10 of this embodiment is made of resin and is a hollow body having both side walls 11, end side walls 12 that cover the space between the both side walls 11, a bottom 13, and an upper wall 14. Arms 15 protrude forward from the both side walls 11, and a marking roller 20 is rotatably supported by bearings 16 at the tip of each arm 15.

[0017] The marking roller 20 is made of a flexible material and is fitted tightly around the outer periphery of a hollow shaft 21 made of resin, as shown in Figures 5 and 6. A central shaft 22 passes through the interior of this hollow shaft 21, and both ends of this central shaft 22 are supported by bearings 16 at the tips of each arm 15. This allows the marking roller 20 to rotate integrally with the hollow shaft 21.

[0018] The flexible material constituting the marking roller 20 refers to a material that can be deformed to conform to the curved or uneven shape of the target to be marked, and can be, for example, silicone rubber. In this embodiment, the entire marking roller 20 is made of silicone rubber, which is a non-porous material, and its outer peripheral surface, the marking surface 23, is also made of a non-porous material. However, it is not necessary for the entire marking roller 20 to be made of a non-porous material; it is sufficient that at least the marking surface 23 is made of a non-porous material.

[0019] 5, in this embodiment, pulleys 24 are integrally formed on both sides of the hollow shaft 21. Anti-slip irregularities are formed on the circumferential surface of the pulleys 24. The role of the pulleys 24 will be described later.

[0020] As shown in Fig. 3, the ink supply roller 30 constituting the ink supply unit has a cylindrical roller body 31 on the outer periphery of which is attached an annular ink pad 32 impregnated with ink, forming a roller-shaped ink pad 32. The roller body 31 is rotatably supported by a shaft 33 shown in Fig. 5 on a bearing 17 formed on the main body 10 shown in Fig. 1. An operating piece 34 is integrally formed at one end of the roller body 31. This operating piece 34 is a disk, and its upper portion is exposed from a notch formed in the upper wall 14 of the main body 10. Therefore, the user can freely rotate the roller body 31 and the ink pad 32 by operating this disk-shaped operating piece 34 with their fingertips.

[0021] As shown in Figures 5 and 6, the center distance between the ink supply roller 30 and the marking roller 20 is set so that the surface of the ink pad 32 of the ink supply roller 30 can lightly press against the marking surface 23 of the marking roller 20. An annular groove 35 that serves as a pulley is formed in the roller body 31 of the ink supply roller 30. As shown in Figures 6 and 7, a belt 36 is wrapped crosswise between this annular groove 35 and the pulley 24 of the marking roller 20. If the marking roller 20 were made of silicone rubber, which has a low coefficient of friction, without the belt 36, the ink supply roller 30 would simply spin freely, preventing smooth ink application. However, the use of the belt 36 ensures that these rollers rotate reliably.

[0022] With this structure, when the operating piece 34 is operated to rotate the ink supply roller 30, the marking roller 20 rotates in the opposite direction, and ink is applied continuously and linearly from the surface of the ink pad 32 of the ink supply roller 30 to the marking surface 23 of the marking roller 20. The marking surface 23 is flexible but is made of a non-porous material, so the applied ink does not penetrate from the marking surface 23 to the interior.

[0023] In this embodiment, the operation piece 34 is provided on the ink supply roller 30, but the operation piece 34 can also be provided on the marking roller 20. Also, in this embodiment, the ink supply roller 30 and the marking roller 20 are connected by a belt 36, but as shown in Figure 8, the ink supply roller 30 and the marking roller 20 can also be connected by gears 37, 28. In this case, too, by rotating either the ink supply roller 30 or the marking roller 20, ink can be transferred from the surface of the ink pad 32 of the ink supply roller 30 to the marking surface 23 of the marking roller 20.

[0024] In the rotary marking tool of the present invention configured as described above, the marking surface 23 of the marking roller 20 is made of a flexible, non-porous material, so that by pressing the marking roller 20 against the surface of the fastening member, the surface of the fastening member can be marked with the ink on the marking surface 23. Because the marking surface 23 is flexible, it deforms to conform to the surface of the fastening member, allowing for clear marking. Moreover, excess ink does not squeeze out from inside the marking roller 20.

[0025] Figure 9 is a diagram illustrating the use of the rotary marking tool of the present invention, showing a fastening member consisting of a bolt 50 and a nut 51. When the fastening member is large, the marking roller 20 is first rotated in the axial direction of the bolt 50 while in contact with it, to mark the shank of the bolt 50, and then the flexibility of the marking roller 20 can be used to push the marking roller 20 into the corner of the fastening member, as shown, to mark the corner. When the fastening member is small, the marking roller 20 can be simply pushed into the corner without rotating it.

[0026] As described above, according to the present invention, clear marking is possible even on corners of fastening members that are not uniform in size or shape. [Explanation of symbols]

[0027] 10 Main Unit 20 Marking roller 30 Ink supply roller 11 Both side walls 12 End side wall 13 Upper wall 15 Arm 16 Bearing section 21 Hollow shaft 22 Center axis 23 Marking surface 24 pulleys 28 Gears 31 Roller body 32 Ink Pad 33 axes 34 Operation piece 35 Annular groove 36 Belt 37 Gears 50 volts 51 Nut

Claims

1. A rotary marking tool comprising a main body that functions as a gripping part, a flexible marking roller rotatably supported by the main body, and an ink supply part that supplies ink to the marking roller, A rotary marking tool characterized in that the marking surface of the marking roller is formed from a flexible non-porous material.

2. 2. The rotary marking tool according to claim 1, wherein either or both of the marking roller and the ink supply unit are provided with an operating piece for applying ink from the ink supply unit to the marking roller.

3. 3. The rotary marking tool according to claim 2, wherein the ink supply portion is an ink supply roller provided with a roller-shaped ink pad impregnated with ink, and the operating piece is integrally formed with the ink supply roller.

4. 4. The rotary marking tool according to claim 3, wherein the marking roller and the ink supply roller are connected via a belt or a gear.

5. 2. A method for marking fasteners using the rotary marking tool described in claim 1, characterized in that a marking roller is rotated in the axial direction of the bolt while in contact with it to mark the shank of the bolt, and at the corners of the fasteners, the marking roller is pushed in by taking advantage of its flexibility to mark the corners.

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