Netting needle and method for manufacturing netting needle

Abstract

To provide a net needle in which the durability can be improved and it can be readily manufactured, and provide a method for manufacturing the net needle.SOLUTION: A net needle 1 has a line-winding spool unit 2 with lines being wound, a tip end 3 formed in tip side of the line-winding spool unit 2 and being tapered, a spool end 4 formed in the rear end side of the line-winding spool unit 2 and having the lines being locked, a hole 6 penetrated in the plate thickness direction at the tip end 3, and a line-hooking protrusion 5 extended from the line-winding spool unit 2 in the hole 6. The needle is formed integrally in aluminum alloy. The surface roughness of a surface 11 and a back surface 12 being an opposite side of the surface 11 is Ra 1.0 or less. A corner for making the line-winding spool unit 2, the tip end 3, the spool end 4, the hole 6 and the line-hooking protrusion 5 becomes a curved surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fishing needle and a method for manufacturing the fishing needle. [Background technology]

[0002] A net needle used for weaving or repairing landing nets or fishing nets is known (Patent Document 1). Conventional net needles have been made of bamboo, wood, resin, or stainless steel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 8-54 Summary of the Invention [Problem to be solved by the invention]

[0004] Net hooks made of bamboo, wood, or resin have the problem that their material and shape are easily changed due to deterioration over time. When the material and shape of the net hook change, the friction between the net hook and fishing nets, etc. increases, and the net hook becomes more likely to get caught in the fishing nets, etc., which reduces workability and makes the net hook more likely to break. In addition, stainless steel net hooks have the problem that they are difficult to process and require high processing costs.

[0005] From this perspective, an object of the present invention is to provide a net needle that is improved in durability and can be easily manufactured, and a method for manufacturing the net needle. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a netting needle having a thread winding section around which thread is wound, a tapered tip section formed at the tip side of the thread winding section, a thread winding end section formed at the rear end side of the thread winding section to which the thread is engaged, a hole section penetrating in the thickness direction of the plate at the tip section, and a thread threading protrusion extending from the thread winding section at the hole section, the netting needle being integrally formed from an aluminum alloy, the surface roughness of the front surface and the back surface opposite the front surface being Ra1.0 or less, and the corners constituting the thread winding section, the tip section, the thread winding end section, the hole section and the thread threading protrusion section being curved.

[0007] According to this configuration, since it is made of aluminum alloy, the material and shape are less likely to change compared to bamboo, wood, or resin, and durability can be improved. In addition, when weaving or repairing fishing nets, etc., it is possible to prevent increased friction with the fishing nets, etc., and to prevent snagging, so workability does not decrease. In addition, since it is made of aluminum alloy, it is softer and easier to process compared to stainless steel, and processing costs can be reduced. In addition, since it is made of aluminum alloy, it is relatively lightweight and has excellent recyclability.

[0008] It is also preferable that the corner has a radius of curvature of 0.3 mm or more. This configuration can improve the workability when weaving or repairing fishing nets, etc.

[0009] The plate thickness is preferably 2 to 10 mm. According to this configuration, the fit is improved and the glove is easier to hold, which improves the workability when weaving or repairing fishing nets, etc.

[0010] The present invention also provides a method for manufacturing a netting needle having a thread winding section around which thread is wound, a tapered tip portion formed at the tip side of the thread winding section, a thread winding end portion formed at the rear end side of the thread winding section to which the thread is engaged, a hole portion penetrating in the thickness direction of the tip portion, and a thread threading protrusion extending from the thread winding section at the hole portion, the method comprising: a first step of cutting an aluminum alloy plate material with a laser to form an intermediate part; and a second step of polishing the intermediate part by barrel polishing, wherein in the second step, the surface roughness of the front surface and the back surface opposite the front surface are set to Ra1.0 or less, and the corners constituting the thread winding section, the tip portion, the thread winding end portion, the hole portion and the thread threading protrusion are set to be curved.

[0011] According to this configuration, since it is made of aluminum alloy, it is softer and easier to process than stainless steel, and processing costs can be reduced. In addition, in the barrel polishing of the second step, the surface roughness and corners can be formed in one step, making it easy to manufacture. Furthermore, since it is made of aluminum alloy, the material and shape are less likely to change compared to bamboo, wood, or resin, and durability can be increased. Furthermore, when weaving or repairing fishing nets, etc., it is possible to prevent increased friction with the fishing nets, etc., and to prevent snagging, improving workability. Furthermore, since it is made of aluminum alloy, it is relatively lightweight and has excellent recyclability.

[0012] In the second step, the radius of curvature of the corner is preferably set to be 0.3 mm or more. This configuration can improve the workability when weaving or repairing fishing nets, etc.

[0013] In addition, in the first step, it is preferable that the plate material is shaped by cutting a rolled material. According to this configuration, the effort and cost required for creating a molding die can be reduced compared to casting or extrusion molding, making production easier. Effect of the Invention

[0014] According to the present invention, it is possible to provide a net needle that can be easily manufactured while improving durability, and a method for manufacturing the net needle. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view of the net needle of the present embodiment. [Diagram 2] FIG. 2 is a plan view of the net needle of the present embodiment. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Diagram 5] FIG. 2 is a cross-sectional view taken along the line VV in FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along the line VI-VI in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] [composition] FIG. 1 is a perspective view of a net needle 1 of this embodiment, and FIG. 2 is a plan view of the net needle 1 of this embodiment. The net needle 1 is a tool used for weaving and repairing landing nets, fishing nets, and the like. The net needle 1 is made of an aluminum alloy, has a plate shape, and is integrally formed. The material (type) of the aluminum alloy may be appropriately selected in consideration of workability and manufacturing costs. The net needle 1 comprises a thread winding portion 2, a tip portion 3, a thread winding end portion 4, and a thread hooking projection portion 5. The thickness of the net needle 1 is constant overall, and may be appropriately selected in the range of 1 to 15 mm, preferably 2 to 10 mm, depending on the application.

[0017] The thread winding section 2 is a section around which a thread (net thread) (not shown) is wound and which is gripped when the net needle 1 is in use. The tip section 3 is a tapered section formed on the tip side of the thread winding section 2. The tip section 3 is formed with a hole section 6 that penetrates in the plate thickness direction. The hole section 6 is cut out so as to have roughly the same shape as the tip section 3.

[0018] The thread winding end 4 is formed on the rear end side of the thread winding unit 2 and is the portion where the thread is secured. The thread winding end 4 is a recess that opens rearward at the rear end of the netting needle 1. The threading projection 5 is an extension from the thread winding unit 2 at the hole 6. The threading projection 5 protrudes in an elongated shape from the tip of the thread winding unit 2 to the center of the width of the hole 6. The tip of the threading projection 5 is tapered.

[0019] In Fig. 1, reference numeral 11 denotes the front surface of the net needle 1, and reference numeral 12 denotes the back surface opposite to the front surface 11. The front surface 11 and back surface 12 are both flat and parallel to each other. The surface roughness (surface roughness) of the front surface 11 and back surface 12 of the net needle 1 is Ra1.0 or less. Reference numerals 13 and 14 denote side surfaces extending in the longitudinal direction on one side or the other side of the net needle 1.

[0020] Further, each corner (edge) constituting the thread winding portion 2, tip portion 3, thread winding end portion 4, thread hooking protrusion 5, and hole 6 is curved. More specifically, as shown in Fig. 3, each corner formed by the front surface 11 and the side surfaces 13, 14, and each corner formed by the back surface 12 and the side surfaces 13, 14 are curved. In other words, each corner constituting tip portion 3 is curved.

[0021] As shown in FIG. 4, each corner formed by the front surface 11 and the side surfaces 15, 16 of the hole 6, and each corner formed by the back surface 12 and the side surfaces 15, 16 of the hole 6 are curved. In addition, each corner formed by the front surface 11 and the side surfaces 17, 18 of the threading protrusion 5, and each corner formed by the back surface 12 and the side surfaces 17, 18 of the threading protrusion 5, are curved. In other words, each corner constituting the threading protrusion 5 and the hole 6 is curved.

[0022] As shown in Fig. 5, each corner formed by the front surface 11 and the side surfaces 13, 14, and each corner formed by the back surface 12 and the side surfaces 13, 14 are curved. As shown in Fig. 1, each corner formed by the front surface 11 and the side surfaces 21, 21 of the hole 6, and each corner formed by the back surface 12 and the side surfaces 21, 21 of the hole 6 are curved. Also, a corner formed by the front surface 11 and the side surface 22 (the end surface on the rear side of the thread winding unit 2), and a corner formed by the back surface 12 and the side surface 22 are curved. That is, each corner forming the thread winding unit 2 is curved.

[0023] 6, each corner formed by the front surface 11 and the side surfaces 13, 14, and each corner formed by the back surface 12 and the side surfaces 13, 14 are curved. Each corner formed by the front surface 11 and the side surfaces 19, 20 of the thread winding end portion 4, and each corner formed by the back surface 12 and the side surfaces 19, 20 of the thread winding end portion 4 are curved.

[0024] 1, each corner formed by the front surface 11 and the end faces 23, 23, and each corner formed by the back surface 12 and the end faces 23, 23 are curved. The end face 23 is the rear end surface of the netting needle 1. Furthermore, the corner formed by the end face 23 and the side face 13, and the corner formed by the end face 23 and the side face 14 are curved. Furthermore, each corner formed by the end face 23 and the side faces 19, 20 of the thread winding end 4 is curved. In other words, each corner that constitutes the thread winding end 4 is curved.

[0025] In this embodiment, each of the above corners (edges) is arc-shaped when viewed in cross section, with a radius of curvature of 0.3 mm or more. If the corners are less than 0.3 mm, they will come into contact with the net, making the net more likely to break, and the corners will also be more likely to wear. Note that each corner only needs to be formed with a curved surface, and may be elliptical or quadratic curved when viewed in cross section.

[0026] [Manufacturing method] Next, a method for manufacturing the net needles will be described. In the method for manufacturing the net needles according to this embodiment, a preparation step, a first step, and a second step are performed.

[0027] The preparation process is a process for forming an aluminum alloy plate material. In the preparation process, an aluminum alloy block is passed between a pair of rotating rollers (not shown) and rolled into a plate shape to form an aluminum alloy plate material (rolled material).

[0028] The first step is a step of forming an intermediate member by laser processing. In the first step, an aluminum alloy plate material is cut by a laser to form an intermediate member having the same outer shape as the net needle 1.

[0029] The second step is a step of polishing the intermediate member by barrel polishing. Barrel polishing is a processing method in which polishing stones (media), workpieces (intermediate members), compounds (lubricants), water, etc. are charged into a barrel tank, and a relative motion difference (friction) or free pressure welding is generated by an externally applied motion to polish the workpiece. Barrel polishing includes, for example, a rotary type, a vibration type, a centrifugal type, and a flow type, and any of these types can be applied in this embodiment. In addition, the type of media and compounds used, the duration of use, etc. can be designed as appropriate.

[0030] That is, in the second step, the conditions of the barrel polishing are set so that the surface roughness of the front surface 11 and the back surface 12 of the net needle 1 is Ra1.0 or less and the radius of curvature of each corner is 0.3 mm or more.

[0031] [How to use] Next, a method of using the net needle 1 will be described. First, one end of the thread is hooked onto the thread hooking projection 5, and the thread is wound back and forth between the thread winding end 4 and the hole 6. This causes the thread to be wound multiple times in the longitudinal direction of the thread winding section 2. Next, while unwinding the thread from the thread winding section 2, it is passed from the tip 3 alternately up and down through the warp threads or adjacent net holes. This allows fishing nets and the like to be woven or repaired.

[0032] [Effects] According to the net needle 1 according to the present embodiment described above, since it is made of an aluminum alloy, the material and shape are less likely to change compared to those made of bamboo, wood, or resin, and durability can be improved. In addition, when weaving or repairing a fishing net, it is possible to prevent an increase in friction with the fishing net, etc., and to prevent snagging, so that workability can be maintained for a long period of time. In addition, since the net needle 1 is made of an aluminum alloy, it is softer and easier to process compared to stainless steel, and processing costs can be reduced. In addition, since it is made of an aluminum alloy, it is relatively lightweight and has excellent recyclability.

[0033] It is also preferable that the thickness of the net needle 1 is 2 to 10 mm. With this configuration, the net needle 1 fits better and is easier to hold, which can further improve the workability when weaving or repairing fishing nets, etc.

[0034] Moreover, by barrel polishing, net needles 1 having the above-mentioned surface roughness and radius of curvature of the corners can be manufactured in a single process. This reduces manufacturing costs. Furthermore, by barrel polishing, burrs caused by laser processing can be easily removed. Furthermore, by cutting rolled material to form plate material, the effort and cost of creating a mold can be reduced compared to casting or extrusion molding, making manufacturing easier. Furthermore, because it is laser processing, even complex shapes such as threading projections 5 and holes 6 can be easily processed, and customization such as size and shape changes can be easily accommodated.

[0035] [Example] The applicant manufactured four types of samples [1] to [4] of the net needle 1 using the above manufacturing method. Sample [1] has a surface roughness of Ra 0.88 and a curvature radius of the corner of 0.54 mm. Sample [2] has a surface roughness of Ra 0.55 and a curvature radius of the corner of 0.43 mm. Sample [3] has a surface roughness of Ra 0.60 and a curvature radius of the corner of 0.36 mm. Sample [4] has a surface roughness of Ra 0.55 and a curvature radius of the corner of 0.47 mm. All of samples [1] to [4] were confirmed to have durability at or above the desired level. In addition, when using samples [1] to [4], it was possible to avoid the corners from getting caught on fishing nets, etc., and work could be carried out smoothly.

[0036] [Variations] (a): The surface roughness of the side faces 13 to 22 and the end faces 23 may be Ra 1.0 or less. (b) In addition, the components of the present invention can be modified as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0037] 1 net needle 2 Thread winding section 3 Tip 4 End of bobbin winding 5 Thread hook protrusion 6 Hole 11 Front 12 Back side 13~22 Side 23 End face

Claims

1. a thread winding section on which thread is wound; A tapered tip portion formed on a tip side of the thread winding portion; a thread winding end portion formed on a rear end side of the thread winding portion and at which the thread is secured; A hole portion penetrating in a plate thickness direction at the tip portion; a threading projection extending from the thread winding portion in the hole, It is integrally formed from an aluminum alloy. The surface roughness of the front surface and the back surface opposite to the front surface is Ra 1.0 or less, A netting needle, characterized in that corners constituting the thread winding portion, the tip portion, the thread winding end portion, the hole portion and the thread threading projection are curved.

2. 2. The netting needle according to claim 1, wherein the corner has a radius of curvature of 0.3 mm or more.

3. The net needle according to claim 1 or 2, characterized in that the plate thickness is 2 to 10 mm.

4. a thread winding section on which thread is wound; A tapered tip portion formed on a tip side of the thread winding portion; a thread winding end portion formed on a rear end side of the thread winding portion and at which the thread is secured; A hole portion penetrating in a plate thickness direction at the tip portion; a threading projection extending from the thread winding portion in the hole, A first step of cutting an aluminum alloy plate material by a laser to form an intermediate part; A second step of polishing the intermediate member by barrel polishing, The method for manufacturing a netting needle is characterized in that in the second step, the surface roughness of the front surface and the back surface opposite the front surface is set to Ra 1.0 or less, and the corners constituting the thread winding portion, the tip portion, the thread winding end portion, the hole portion and the thread threading protrusion are set to be curved.

5. 5. The method for manufacturing a net needle according to claim 4, wherein in the second step, the radius of curvature of the corner is set to be 0.3 mm or more.

6. 6. The method for manufacturing net needles according to claim 4 or 5, wherein in the first step, a rolled material is cut to form the plate material.

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