Reels and methods for manufacturing reels

Abstract

This technology provides a way to prevent the wire from coming out of the bobbin while allowing the wire to be easily separated from the bobbin after it has been used up. [Solution] The reel comprises a bobbin that is rotatably mounted on a rebar tying machine around a predetermined axis of rotation, and a wire wound around the bobbin. The bobbin comprises a body portion including a cylindrical surface, a flange portion extending radially outward from the end of the cylindrical surface to the axis of rotation, a notch portion penetrating the flange portion in the thickness direction, and a wire locking portion positioned on the outside of the flange portion when viewed from the cylindrical surface. The wire locking portion comprises a slit and a locking wall in which the slit is formed. The wire comprises a retaining portion positioned on the outside of the flange portion when viewed from the cylindrical surface and formed by winding the wire in at least a loop, a relay portion extending from the tip of the retaining portion, passing through the inside of the slit and reaching the inside of the flange portion, and a winding portion extending from the tip of the relay portion and wound around the cylindrical surface.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a reel and a method for manufacturing a reel.

Background Art

[0002] Patent Document 1 discloses a reel used in a steel bar bundling machine. The reel includes a bobbin rotatably attached to the steel bar bundling machine about a predetermined rotation axis, and a wire wound around the bobbin and fed out from the bobbin by the steel bar bundling machine. The bobbin includes a body portion including a cylindrical surface, a flange portion extending radially outward of the rotation axis from an end of the cylindrical surface, a notch portion penetrating the flange portion in the thickness direction, and a wire locking portion disposed outside the flange portion as viewed from the cylindrical surface. The wire locking portion includes a plurality of grooves. The wire includes a bent portion formed by bending the wire so as to be caught in each of the plurality of grooves, and a winding portion extending from a tip of the bent portion and wound around the cylindrical surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the reel described in Patent Document 1, when the wire is fed out from the bobbin, the bent portion catches in multiple grooves, preventing the wire from coming off the bobbin. However, after the user has used up the wire (specifically, the winding portion of the wire), in order to separate and dispose of the remaining wire and bobbin, the user needs to pull the bent portion of the wire out from each of the multiple grooves to separate the wire from the bobbin. Therefore, even if the wire is prevented from coming off the bobbin, the operation of separating the wire from the bobbin after it has been used up is difficult. This specification provides a technology that prevents the wire from coming off the bobbin while enabling the wire to be separated from the bobbin with a simple operation after it has been used up. [Means for solving the problem]

[0005] The reel disclosed herein comprises a bobbin rotatably mounted to a rebar tying machine about a predetermined axis of rotation, and a wire wound around the bobbin and fed out from the bobbin by the rebar tying machine. The bobbin comprises a body portion including a cylindrical surface, a flange portion extending radially outward from the end of the cylindrical surface to the axis of rotation, a notch portion penetrating the flange portion in the thickness direction, and a wire locking portion positioned outside the flange portion as viewed from the cylindrical surface. The wire locking portion comprises a slit wider than the diameter of the wire, open to the space outside the flange portion, and a locking wall in which the slit is formed. The wire comprises a retaining portion positioned outside the flange portion as viewed from the cylindrical surface, formed by winding the wire in at least a loop, a relay portion extending from the tip of the retaining portion, passing through the inside of the slit and reaching the inside of the flange portion, and a winding portion extending from the tip of the relay portion and wound around the cylindrical surface.

[0006] With the above configuration, when the wire is fed out from the bobbin, the retaining part catches on the locking wall, preventing the wire from coming out of the bobbin. Furthermore, after the wire (specifically, the winding portion of the wire) has been used up, the user can separate the wire from the bobbin by pulling the retaining part away from the locking wall or by moving the retaining part so that the wire is pulled out from the opening end of the slit. Thus, with the above configuration, the wire can be prevented from coming out of the bobbin, and after the wire has been used up, it can be separated from the bobbin with a simple operation.

[0007] Another reel disclosed herein comprises a bobbin rotatably mounted to a rebar tying machine about a predetermined axis of rotation, and a wire wound around the bobbin and fed out of the bobbin by the rebar tying machine. The bobbin comprises a body including a cylindrical surface, a flange extending radially outward from the end of the cylindrical surface to the axis of rotation, a notch penetrating the flange in the thickness direction, and a wire locking portion positioned outside the flange as viewed from the cylindrical surface. The wire locking portion comprises a slit wider than the diameter of the wire, open to the space outside the flange, and a locking wall in which the slit is formed. The wire comprises a retaining portion positioned outside the flange as viewed from the cylindrical surface, a relay portion extending from the tip of the retaining portion, passing through the inside of the slit, and reaching the inside of the flange, and a winding portion extending from the tip of the relay portion and wound around the cylindrical surface. The crushed portion formed by crushing the wire functions as the retaining portion.

[0008] With the above configuration, when the wire is fed out from the bobbin, the retaining part catches on the locking wall, preventing the wire from coming out of the bobbin. Furthermore, after the wire (specifically, the winding portion of the wire) has been used up, the user can separate the wire from the bobbin by pulling the retaining part away from the locking wall or by moving the retaining part so that the wire is pulled out from the opening end of the slit. Thus, with the above configuration, the wire can be prevented from coming out of the bobbin, and after the wire has been used up, it can be separated from the bobbin with a simple operation.

[0009] Another reel disclosed herein includes a bobbin rotatably mounted to a rebar tying machine about a predetermined axis of rotation, and a wire wound around the bobbin and fed out of the bobbin by the rebar tying machine. The bobbin includes a body portion including a cylindrical surface, a flange portion extending radially outward from the end of the cylindrical surface to the axis of rotation, a notch portion penetrating the flange portion in the thickness direction, and a wire locking portion positioned outside the flange portion as viewed from the cylindrical surface. The wire locking portion includes a through hole larger than the diameter of the wire and a locking wall in which the through hole is formed. The wire includes a retaining portion positioned outside the flange portion as viewed from the cylindrical surface, a relay portion extending from the tip of the retaining portion, passing through the inside of the through hole and reaching the inside of the flange portion, and a winding portion extending from the tip of the relay portion and wound around the cylindrical surface. One of the following functions as the retaining portion: a knot formed by tying the wires together, a twist formed by twisting the wires, a crushed portion formed by crushing the wires, and a loop formed by crimping two points of the wires together.

[0010] With the above configuration, when the wire is fed out from the bobbin, the retaining part catches on the locking wall, preventing the wire from coming out of the bobbin. Furthermore, after the user has used up the wire (specifically, the winding portion of the wire), they can separate the wire from the bobbin by pulling the retaining part away from the locking wall. Therefore, with the above configuration, the wire cannot come out of the bobbin, and after the wire has been used up, it can be separated from the bobbin with a simple operation.

[0011] A method for manufacturing a reel disclosed herein comprises the steps of preparing a wire and preparing a bobbin that is rotatably mounted on a rebar tying machine about a predetermined axis of rotation, wherein the bobbin comprises a body including a cylindrical surface, a flange extending radially outward from the end of the cylindrical surface to the axis of rotation, a notch penetrating the flange in the thickness direction, and a wire locking portion positioned outside the flange as viewed from the cylindrical surface, wherein the wire locking portion is open to the space outside the flange, and the wire The method comprises the steps of: preparing the bobbin having a slit wider than the diameter and a locking wall in which the slit is formed; winding the wire at least in a loop to form a retaining portion on the wire; positioning the retaining portion on the outside of the flange portion as viewed from the cylindrical surface; passing the intermediate portion of the wire extending from the tip of the retaining portion through the inside of the slit; and winding the reel portion of the wire extending from the tip of the intermediate portion around the cylindrical surface.

[0012] In a reel manufactured by the above method, the retaining part catches on the locking wall when the wire is fed out from the bobbin, preventing the wire from coming off the bobbin. Furthermore, after the wire (specifically, the winding portion of the wire) has been used up, the user can separate the wire from the bobbin by pulling the retaining part away from the locking wall or by moving the retaining part so that the wire is pulled out from the opening end of the slit. Thus, in a reel manufactured by the above method, the wire cannot come off the bobbin, and after the wire has been used up, it can be separated from the bobbin with a simple operation. [Brief explanation of the drawing]

[0013] [Figure 1] This is a view of the rebar tying machine 2 of Example 1, seen from the rear left and above. [Figure 2] This diagram shows the internal structure of the rebar tying machine 2 in Example 1. [Figure 3] This is a view of the left side of the bobbin 24 of Example 1, seen from a direction inclined with respect to the rotation axis AX. [Figure 4] This is a view of the right side of the bobbin 24 of Example 1, seen from a direction inclined with respect to the rotation axis AX. [Figure 5] This is a view of the left side of the bobbin 24 of Example 1, seen from a direction inclined with respect to the rotation axis AX. [Figure 6] This is a view of the bobbin 24 of Example 1, taken from a direction perpendicular to the rotation axis AX. [Figure 7] This is a cross-sectional view showing the structure near the locking projection 98 in Example 1. [Figure 8] This is a view of the left side of the reel 22 of Example 1, seen from a direction inclined with respect to the rotation axis AX. [Figure 9] This is a view of the left side of the reel 22 in Example 1, along the rotation axis AX. [Figure 10] This is a view of the left side of the reel 22 in Example 2, along the rotation axis AX. [Figure 11] This is a view of the left side of the reel 22 in Example 3, along the rotation axis AX. [Figure 12] It is a view of the left surface of the reel 22 of Example 4 as seen along the rotation axis AX. [Figure 13] It is a view of the right surface of the reel 22 of Example 5 as seen from a direction inclined with respect to the rotation axis AX. **BEST MODE FOR CARRYING OUT THE INVENTION**

[0014] Representative and non - limiting specific examples of the present invention will be described in detail below with reference to the drawings. This detailed description is merely intended to show those skilled in the art the details for implementing preferred examples of the present invention, and is not intended to limit the scope of the present invention. Also, the disclosed additional features and inventions can be used separately or together with other features or inventions in order to provide a further improved reel and a method for manufacturing a reel.

[0015] Also, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense, and are described only for the purpose of explaining representative specific examples of the present invention in particular. Furthermore, the various features of the following representative specific examples, as well as the various features described in the claims, do not have to be combined as described in the specific examples here or in the order listed when providing additional and useful embodiments of the present invention.

[0016] All features described in this specification and / or in the claims are intended to be disclosed individually and independently of each other as limitations to the specific matters described in the initial disclosure and in the claims, separate from the configurations of the features described in the examples and / or in the claims. Furthermore, all descriptions regarding numerical ranges and groups or populations are made with the intention of disclosing intermediate configurations as limitations to the specific matters described in the initial disclosure and in the claims.

[0017] In one or more embodiments, a knot formed by tying the wire may function as the retaining portion.

[0018] When the wire is fed out from the bobbin, a reaction force from the locking wall acts on the retaining portion that catches on the locking wall. Due to this reaction force, the retaining portion may deform (for example, the retaining portion may bend or the loop of the wire forming the retaining portion may loosen). When the retaining portion deforms, there is a risk that the engagement between the retaining portion and the locking wall may be unintentionally released. According to the above configuration, when the wire is fed out from the bobbin, the retaining portion is less likely to deform. Thereby, it is possible to suppress the unintentional release of the engagement between the retaining portion and the locking wall.

[0019] In one or more embodiments, a twist formed by twisting the wire may function as the retaining portion.

[0020] When the wire is fed out from the bobbin, a reaction force from the locking wall acts on the retaining portion that catches on the locking wall. Due to this reaction force, the retaining portion may deform (for example, the retaining portion may bend or the loop of the wire forming the retaining portion may loosen). When the retaining portion deforms, there is a risk that the engagement between the retaining portion and the locking wall may be unintentionally released. According to the above configuration, when the wire is fed out from the bobbin, the retaining portion is less likely to deform. Thereby, it is possible to suppress the unintentional release of the engagement between the retaining portion and the locking wall.

[0021] In one or more embodiments, a loop portion formed by caulking two locations of the wire together may function as the retaining portion.

[0022] When wire is fed out from the bobbin, a reaction force acts on the retaining part that catches on the locking wall. This reaction force can cause the retaining part to deform (for example, the retaining part may bend, or the loop of wire forming the retaining part may come undone). When the retaining part deforms, there is a risk that the catch between the retaining part and the locking wall may be released unintentionally. With the above configuration, the retaining part is less likely to deform when wire is fed out from the bobbin. This prevents the catch between the retaining part and the locking wall from being released unintentionally.

[0023] In one or more embodiments, the wire locking portion may include a projection that protrudes from the locking wall around the slit. When viewed along the direction from the opening end to the base end of the slit, at least a portion of the retaining portion may be hidden by the projection.

[0024] If the retaining part moves relative to the locking wall, there is a risk that the engagement between the retaining part and the locking wall may be unintentionally released. With the above configuration, the movement of the retaining part relative to the locking wall is suppressed by the projection. This prevents the engagement between the retaining part and the locking wall from being unintentionally released.

[0025] In one or more embodiments, when a direction parallel to the axis of rotation is defined as a first direction from the flange toward the cylindrical surface and a second direction from the cylindrical surface toward the flange, the base end of the slit may be offset in the first direction from the surface of the flange toward the first direction. The opening end of the slit may be offset in the second direction from the surface of the flange toward the second direction.

[0026] With the above configuration, the depth of the slit increases. Therefore, even if the retaining part moves slightly relative to the locking wall, the engagement between the retaining part and the locking wall will not be released. This prevents the engagement between the retaining part and the locking wall from being released unintentionally.

[0027] In one or more embodiments, the retaining portion may be positioned radially inward of the rotation axis relative to the cylindrical surface.

[0028] With the above configuration, the moment of inertia of the reel around the axis of rotation is smaller compared to when the retaining part is positioned radially outward from the cylindrical surface. This makes it easier to rotate the reel around the axis of rotation.

[0029] (Example 1) The rebar tying machine 2 shown in Figure 1 ties multiple reinforcing bars R together using wire W.

[0030] (Configuration of rebar tying machine 2) The rebar tying machine 2 comprises a main body 4, a grip 6, a battery mounting section 10, and a reel holder 12. The grip 6 is a component for the operator to grasp. The grip 6 is located on the lower rear side of the main body 4. The grip 6 is integrally formed with the main body 4. A trigger 14 for causing the rebar tying machine 2 to perform a tying operation is attached to the upper front side of the grip 6. The battery mounting section 10 is located below the grip 6. The battery mounting section 10 is integrally formed with the grip 6. A battery pack B is detachably attached to the battery mounting section 10. The battery pack B is, for example, a lithium-ion battery. The reel holder 12 is located on the lower front side of the main body 4. The reel holder 12 is located in front of the grip 6. In this embodiment, the longitudinal direction of the torsion mechanism 38 (see Figure 2), which will be described later, is referred to as the front-rear direction, the direction perpendicular to the front-rear direction is referred to as the up-down direction, and the direction perpendicular to both the front-rear direction and the up-down direction is referred to as the left-right direction.

[0031] The top surface of the main unit 4 is equipped with a power switch 4a for turning the power of the rebar tying machine 2 on and off, a setting switch 4b for changing various settings such as the tying force of the rebar tying machine 2, and a display unit 4c for displaying information regarding the current settings of the rebar tying machine 2.

[0032] The reel holder 12 comprises a holder housing 16 and a cover member 18. The holder housing 16 is located at the front lower part of the main body 4, in front of the battery mounting portion 10. The cover member 18 is attached to the holder housing 16 so as to be rotatable around a pivot shaft 20 at the top of the holder housing 16. The user can access the inside of the holder housing 16 by opening the cover member 18 relative to the holder housing 16.

[0033] As shown in Figure 2, the holder housing 16 is capable of housing the reel 22. The reel 22 includes a bobbin 24 and a wire W wound around the bobbin 24. The bobbin 24 is mounted to the holder housing 16 so as to be rotatable around a pivot axis AX that extends in the left-right direction. The rebar tying machine 2 ties the reinforcing bars R using the wire W fed from the bobbin 24.

[0034] The rebar tying machine 2 comprises a feeding mechanism 32, a guiding mechanism 34, a cutting mechanism 36, a twisting mechanism 38, a feeding motor 40, and a twisting motor 42.

[0035] The feed mechanism 32 is housed in the front lower part of the main body 4. The feed mechanism 32 includes a feed roller 44. The feed roller 44 is connected to a feed motor 40 via a reduction gear (not shown). When the feed motor 40 rotates, the feed roller 44 rotates. By rotating in the forward direction, the feed roller 44 feeds the wire W out of the bobbin 24 and feeds it forward and upward toward the guide mechanism 34. Conversely, by rotating in the reverse direction, the feed roller 44 pulls the wire W back toward the bobbin 24.

[0036] The guide mechanism 34 is located at the front of the main body 4. The guide mechanism 34 comprises an upper curl guide 46 and a lower curl guide 48. When tying the reinforcing bar R, it is positioned between the upper curl guide 46 and the lower curl guide 48. The wire W fed from the feed roller 44 is first guided by the upper curl guide 46 and passes through the upper curl guide 46 from rear to front. While the wire W passes through the upper curl guide 46, the upper curl guide 46 imparts a downward curl to the wire W. After passing through the upper curl guide 46, the wire W is guided by the lower curl guide 48 and passes through the lower curl guide 48 from front to rear. After that, the wire W moves to the rear upper side. As a result, the wire W is wound around the reinforcing bar R.

[0037] The cutting mechanism 36 is housed in the lower part of the main body 4. The cutting mechanism 36 includes a cutter (not shown) that cuts the wire W that is fed from the feeding mechanism 32 to the guide mechanism 34. The cutter cuts the wire W in conjunction with the twisting mechanism 38, which will be described later.

[0038] The torsion mechanism 38 is housed in the main body 4. The torsion mechanism 38 comprises a sleeve unit 50 and a gripping unit 52. The sleeve unit 50 is connected to the torsion motor 42 via a reduction gear (not shown). When the torsion motor 42 rotates, the sleeve unit 50 moves in the forward and backward directions, or rotates around a rotation axis that extends in the forward and backward directions. The gripping unit 52 is located at the front of the torsion mechanism 38. When the sleeve unit 50 moves forward, the gripping unit 52 grips a first point of the wire W around the reinforcing bar R. When the sleeve unit 50 moves further forward, the gripping unit 52 grips a second point of the wire W around the reinforcing bar R that is closer to the base end than the first point. From this state, when the wire W is cut by the cutting mechanism 36 and the sleeve unit 50 rotates further forward, the gripping unit 52 rotates integrally with the sleeve unit 50. As a result, the gripping unit 52 twists the wire W. This causes the reinforcing bar R to be tied together using the wire W. When the sleeve unit 50 rotates in the opposite direction, the wire W is released from the gripping unit 52, and the sleeve unit 50 moves backward.

[0039] Each time the trigger 14 is operated, the rebar tying machine 2 performs a series of tying operations: the feeding mechanism 32 feeds the wire W from the bobbin 24, the guiding mechanism 34 winds the wire W around the rebar R, the twisting mechanism 38 grips the first point of the wire W, the feeding mechanism 32 pulls the wire W back towards the bobbin 24, the twisting mechanism 38 grips the second point of the wire W, the cutting mechanism 36 cuts the wire W, and the twisting mechanism 38 twists the wire W.

[0040] (Reel 22 configuration) As shown in Figure 3, the bobbin 24 comprises a body portion 64 including a cylindrical surface 62 extending in the left-right direction, a left flange portion 66 extending radially outward from the left end of the cylindrical surface 62 toward the rotation axis AX, and a right flange portion 68 extending radially outward from the right end of the cylindrical surface 62 toward the rotation axis AX. The wire W is wound around the cylindrical surface 62. The left flange portion 66 restricts the movement of the wire W wound around the cylindrical surface 62 to the left. The right flange portion 68 restricts the movement of the wire W wound around the cylindrical surface 62 to the right. In this embodiment, the space extending radially outward from the cylindrical surface 62 (i.e., the space between the right surface 66a of the left flange 66 and the left surface 68a of the right flange 68) is referred to as the "inner space of the left flange 66" or the "inner space of the right flange 68," the space beyond the left flange 66 as viewed from the cylindrical surface 62 is referred to as the "outer space of the left flange 66," and the space beyond the right flange 68 as viewed from the cylindrical surface 62 is referred to as the "outer space of the right flange 68."

[0041] The body portion 64 comprises an outer cylindrical portion 72 defining the cylindrical surface 62, an inner cylindrical portion 74 positioned inside the outer cylindrical portion 72, a connecting rib 76 connecting the outer cylindrical portion 72 and the inner cylindrical portion 74, and a partition wall 78 dividing the interior of the inner cylindrical portion 74. The partition wall 78 extends perpendicular to the axis of rotation AX. The partition wall 78 divides the internal space of the inner cylindrical portion 74 into a left internal space 80 and a right internal space 82 (see Figure 4). The left internal space 80 is open to the space outside the left flange portion 66.

[0042] The left flange portion 66 has a first left-side notch 84 and a second left-side notch 86. The first left-side notch 84 penetrates the left flange portion 66 in the thickness direction, extends from the outer peripheral edge of the left flange portion 66 to the inner cylindrical portion 74, and connects to the slit 96 described later. The second left-side notch 86 penetrates the left flange portion 66 in the thickness direction and is formed to be recessed from the outer peripheral edge of the left flange portion 66. The right flange portion 68 also has a right-side notch 88. The right-side notch 88 penetrates the right flange portion 68 in the thickness direction and extends from the outer peripheral edge of the right flange portion 68 to the outer cylindrical portion 72. The right-side notch 88 is positioned opposite the left flange portion 66 in the left-right direction.

[0043] As shown in Figure 4, the right internal space 82 is open to the space outside the right flange 68. When the bobbin 24 is attached to the rebar tying machine 2 (see Figure 1), a support cylinder (not shown) provided by the holder housing 16 (see Figure 1) is rotatably received in the right internal space 82. Similarly, a support cylinder (not shown) provided by the cover member 18 (see Figure 1) is rotatably received in the left internal space 80 (see Figure 3). This allows the bobbin 24 to be rotatably supported by the rebar tying machine 2.

[0044] An identification projection 90 protruding to the right is formed on the right side 78a of the partition wall 78. The length of the identification projection 90 is set to a different length for each type of reel 22. Therefore, the type of reel 22 can be identified based on the length of the identification projection 90. The types of reel 22 referred to here are classified by, for example, the diameter of the wire W, the material of the wire W, the presence or absence of a covering material covering the wire W and the material of the covering material, the presence or absence of surface treatment on the wire W and the content of the surface treatment. Furthermore, the rebar tying machine 2 (see Figure 1) is equipped with a wire type detection device (not shown) that detects the type of reel 22 by detecting the length of the identification projection 90 of the reel 22 attached to the reel holder 12 (see Figure 1).

[0045] As shown in Figure 5, a wire locking portion 92 is formed in the portion of the inner cylindrical portion 74 that is exposed to the space outside the left flange portion 66. The wire locking portion 92 comprises a locking wall 94, a slit 96, and two locking protrusions 98. The locking wall 94 is part of the inner cylindrical portion 74. The locking wall 94 extends to the left from the left surface 78b of the partition wall 78. The slit 96 penetrates the locking wall 94 in the thickness direction. The slit 96 is open to the space outside the left flange portion 66. The slit 96 extends linearly along the left-right direction from a base end 96a located at the base of the locking wall 94 (i.e., the left surface 78b of the partition wall 78) to an open end 96b located at the end of the locking wall 94 (i.e., the left end of the inner cylindrical portion 74). As shown in Figure 6, the base end 96a of the slit 96 is offset to the right of the right surface 66a of the left flange portion 66. The opening end 96b of the slit 96 is offset to the left of the left surface 66b of the left flange portion 66. The depth of the slit 96 (i.e., the length of the slit 96 in the left-right direction) is, for example, in the range of 5 mm to 15 mm, and is 12 mm in this embodiment. The width of the slit 96 is approximately constant from the base end 96a to the opening end 96b and is larger than the diameter of the wire W. The diameter of the wire W is, for example, in the range of 0.5 mm to 2.5 mm, and is 1.6 mm in this embodiment. The width of the slit 96 is, for example, in the range of 0.6 mm to 5.0 mm, and is 3.1 mm in this embodiment.

[0046] As shown in Figure 5, the locking projection 98 protrudes from the locking wall 94 around the slit 96. One end of the locking projection 98 smoothly connects to one side of the slit 96. The other end of the locking projection 98 smoothly connects to the other side of the slit 96. As shown in Figure 7, the right side 98a of the locking projection 98 is spaced to the left from the left side 78b of the partition wall 78. The right side 98a of the locking projection 98 is a plane inclined with respect to the left side 78b of the partition wall 78. The right side 98a of the locking projection 98 is inclined to move away from the left side 78b of the partition wall 78 as it moves away from the locking wall 94. As a result, the gap 100 between the partition wall 78 and the locking projection 98 narrows as it approaches the locking wall 94. The left side 98b of the locking projection 98 extends to move closer to the left side 78b of the partition wall 78 as it moves away from the locking wall 94. The locking projection 98 is positioned so as not to interfere with the support cylinder (not shown) of the cover member 18 that enters the left internal space 80. In addition, a through hole 102 is formed in the portion of the partition wall 78 facing the locking projection 98, penetrating the partition wall 78 in the left-right direction. The through hole 102 is larger than the diameter of the wire W.

[0047] As shown in Figure 8, the wire W wound around the bobbin 24 includes a retaining portion 112 positioned outside the left flange portion 66, a relay portion 114 extending from the tip of the retaining portion 112, passing through the inside of the slit 96 and reaching the inside of the left flange portion 66, a winding portion 116 extending from the tip of the relay portion 114 and wound around the cylindrical surface 62, and a tip portion 118 extending from the tip of the winding portion 116, passing through the inside of the first left-side notch portion 84 and reaching the outside of the left flange portion 66.

[0048] In this embodiment, the knot 120 formed by tying the base end of the wire W functions as the retaining portion 112. The knot 120 is not limited to the knot shown in the figure, but may be formed by other knots (for example, a baton knot, a figure-eight knot, a bowline knot, a middleman's knot, a handcuff knot, a lasso knot, a waist knot, a bow knot, an overhand knot, a rabbit knot, or an Ashley stopper knot). The retaining portion 112 is held in the gap 100 between the partition wall 78 and the locking projection 98.

[0049] As shown in Figure 9, when viewed along the direction from the opening end 96b of the slit 96 toward the base end 96a (i.e., to the right), a portion of the retaining portion 112 is hidden by the locking projection 98. The retaining portion 112 is positioned radially inward from the cylindrical surface 62 relative to the rotation axis AX and is located in the left internal space 80. The retaining portion 112 is positioned so as not to interfere with the support cylinder (not shown) of the cover member 18 that enters the left internal space 80. Furthermore, the retaining portion 112 is prevented from passing through the slit 96. When the wire W is fed out from the bobbin 24, the retaining portion 112 catches on the locking wall 94, thereby preventing the wire W from coming out of the bobbin 24.

[0050] In the manufacturing process of the reel 22 shown in Figure 8, first, a bobbin 24 and wire W are prepared. Next, the intermediate section 114 is passed inside the slit 96, and the vicinity of the base end of the wire W is positioned in the left internal space 80. Next, a retaining section 112 is formed near the base end of the wire W. In this embodiment, a knot 120 is formed near the base end of the wire W. Next, the retaining section 112 is pushed into the gap 100 between the partition wall 78 and the locking projection 98, and the retaining section 112 is held in the gap 100 between the partition wall 78 and the locking projection 98. Next, the portion of the wire W closer to the tip than the intermediate section 114 is wound around the cylindrical surface 62 to form a wound section 116. Next, the portion of the wire W closer to the tip than the wound section 116 is passed inside the first left notch 84, and aligned with the second left notch 86 on the outside of the left flange 66 and radially outward of the inner cylindrical section 74. Next, the wire W is cut at the position of the second left-side notch 86 to form the tip portion 118. This completes the manufacturing of the reel 22.

[0051] When separating the wire W (specifically, the winding portion 116) from the bobbin 24 after it has been used up, first, the retaining portion 112 is pulled out from the gap 100 between the partition wall 78 and the locking projection 98. Next, the retaining portion 112 is pulled away from the locking wall 94, or the retaining portion 112 is moved to the left so that the wire W is pulled out from the open end 96b of the slit 96. This completes the separation of the bobbin 24 from the wire W.

[0052] (Features of Example 1) The reel 22 of this embodiment includes a bobbin 24 that is rotatably mounted on a rebar tying machine 2 around a predetermined rotation axis AX, and a wire W that is wound around the bobbin 24 and fed out from the bobbin 24 by the rebar tying machine 2. The bobbin 24 includes a body portion 64 including a cylindrical surface 62, a left flange portion 66 (example of a flange portion) that extends radially outward from the end of the cylindrical surface 62 toward the rotation axis AX, a first left-side notch portion 84 (example of a notch portion) that penetrates the left flange portion 66 in the thickness direction, and a wire locking portion 92 that is positioned outside the left flange portion 66 when viewed from the cylindrical surface 62. The wire locking portion 92 includes a slit 96 that is wider than the diameter of the wire W and is open to the space outside the left flange portion 66, and a locking wall 94 in which the slit 96 is formed. The wire W is positioned on the outside of the left flange portion 66 when viewed from the cylindrical surface 62 and includes a retaining portion 112 formed by winding the wire W in at least a loop, a relay portion 114 extending from the tip of the retaining portion 112, passing through the inside of the slit 96 and reaching the inside of the left flange portion 66, and a winding portion 116 extending from the tip of the relay portion 114 and being wound around the cylindrical surface 62.

[0053] With the above configuration, when the wire W is fed out from the bobbin 24, the retaining part 112 catches on the locking wall 94, thereby preventing the wire W from coming out of the bobbin 24. Furthermore, after the wire W (specifically, the winding portion 116 of the wire W) has been used up, the user can separate the wire W from the bobbin 24 by pulling the retaining part 112 away from the locking wall 94, or by moving the retaining part 112 so that the wire W is pulled out from the opening end 96b of the slit 96. Thus, with the above configuration, the wire W can be prevented from coming out of the bobbin 24, and after the wire W has been used up, it can be separated from the bobbin 24 with a simple operation.

[0054] Furthermore, the knot 120 formed by tying the wire W functions as a retaining part 112.

[0055] When the wire W is fed out from the bobbin 24, a reaction force from the locking wall 94 acts on the retaining portion 112 that catches on the locking wall 94. This reaction force can cause the retaining portion 112 to deform (for example, the retaining portion 112 may bend, or the loop of wire W forming the retaining portion 112 may come undone). If the retaining portion 112 deforms, there is a risk that the catch between the retaining portion 112 and the locking wall 94 may be released unintentionally. With the above configuration, the retaining portion 112 is less likely to deform when the wire W is fed out from the bobbin 24. This makes it possible to suppress the unintentional release of the catch between the retaining portion 112 and the locking wall 94.

[0056] Furthermore, the wire locking portion 92 includes a locking projection 98 (example of a projection) that protrudes from the locking wall 94 around the slit 96. When viewed along the direction from the opening end 96b of the slit 96 toward the base end 96a, at least a portion of the retaining portion 112 is hidden by the locking projection 98.

[0057] If the retaining portion 112 moves relative to the locking wall 94, there is a risk that the engagement between the retaining portion 112 and the locking wall 94 may be unintentionally released. With the above configuration, the movement of the retaining portion 112 relative to the locking wall 94 is suppressed by the locking projection 98. This prevents the engagement between the retaining portion 112 and the locking wall 94 from being unintentionally released.

[0058] Furthermore, when the direction parallel to the axis of rotation AX, and the direction from the left flange 66 toward the cylindrical surface 62 (i.e., the rightward direction) is defined as the first direction, and the direction from the cylindrical surface 62 toward the left flange 66 (i.e., the leftward direction) is defined as the second direction, the base end 96a of the slit 96 is offset in the first direction from the right surface 66a of the left flange 66 (an example of the surface in the first direction). The opening end 96b of the slit 96 is offset in the second direction from the left surface 66b of the left flange 66 (an example of the surface in the second direction).

[0059] With the above configuration, the depth of the slit 96 increases. Therefore, even if the retaining part 112 moves slightly relative to the locking wall 94, the engagement between the retaining part 112 and the locking wall 94 will not be released. This prevents the engagement between the retaining part 112 and the locking wall 94 from being released unintentionally.

[0060] Furthermore, the retaining portion 112 is positioned radially inward from the cylindrical surface 62 relative to the rotation axis AX.

[0061] With the above configuration, the moment of inertia of the reel 22 around the rotation axis AX is smaller compared to the case where the retaining portion 112 is positioned radially outward from the cylindrical surface 62. This makes it easier to rotate the reel 22 around the rotation axis AX.

[0062] The manufacturing method of the reel 22 in this embodiment includes the steps of preparing a wire W and preparing a bobbin 24 that is rotatably mounted on a rebar tying machine 2 around a predetermined rotation axis AX, wherein the bobbin 24 comprises a body portion 64 including a cylindrical surface 62, a left flange portion 66 extending radially outward from the end of the cylindrical surface 62 toward the rotation axis AX, a first left-side notch portion 84 penetrating the left flange portion 66 in the thickness direction, and a wire locking portion 92 positioned outside the left flange portion 66 when viewed from the cylindrical surface 62, wherein the wire locking portion 92 is open to the space outside the left flange portion 66, The process includes the steps of: preparing a bobbin 24 having a slit 96 wider than the diameter of the wire W and a locking wall 94 in which the slit 96 is formed; winding the wire W at least in a loop to form a retaining portion 112 on the wire W; positioning the retaining portion 112 on the outside of the left flange portion 66 when viewed from the cylindrical surface 62; passing a relay portion 114 of the wire W extending from the tip of the retaining portion 112 through the inside of the slit 96; and winding a winding portion 116 of the wire W extending from the tip of the relay portion 114 around the cylindrical surface 62.

[0063] In the reel 22 manufactured by the above method, when the wire W is fed out from the bobbin 24, the retaining part 112 catches on the locking wall 94, thereby preventing the wire W from coming out of the bobbin 24. Furthermore, after the wire W (specifically, the winding portion 116 of the wire W) has been used up, the user can separate the wire W from the bobbin 24 by pulling the retaining part 112 away from the locking wall 94, or by moving the retaining part 112 so that the wire W is pulled out from the opening end 96b of the slit 96. Thus, in the reel 22 manufactured by the above method, the wire W can be prevented from coming out of the bobbin 24, and after the wire W has been used up, it can be separated from the bobbin 24 with a simple operation.

[0064] (Example 2) As shown in Figure 10, the reel 22 of this embodiment differs from the reel 22 of Embodiment 1 in that a twisted section 130, rather than a knot 120 (see Figure 9), functions as a retaining section 112. The twisted section 130 is formed by twisting the wires together at the points where they intersect, while the wires W are wound in a closed loop near their base ends. The twisted section 130 is pushed into the gap 100 (see Figure 7) between the partition wall 78 and the locking projection 98 and is held in place by the gap 100.

[0065] (Features of Example 2) In this embodiment, the twisted section 130 formed by twisting the wire W functions as a retaining section 112.

[0066] When the wire W is fed out from the bobbin 24, a reaction force from the locking wall 94 acts on the retaining portion 112 that catches on the locking wall 94. This reaction force can cause the retaining portion 112 to deform (for example, the retaining portion 112 may bend, or the loop of wire W forming the retaining portion 112 may come undone). If the retaining portion 112 deforms, there is a risk that the catch between the retaining portion 112 and the locking wall 94 may be released unintentionally. With the above configuration, the retaining portion 112 is less likely to deform when the wire W is fed out from the bobbin 24. This makes it possible to suppress the unintentional release of the catch between the retaining portion 112 and the locking wall 94.

[0067] (Example 3) As shown in Figure 11, the reel 22 of this embodiment differs from the reel 22 of Embodiment 1 in that the crimped portion 140, rather than the knot 120 (see Figure 9), functions as the retaining portion 112. The crimped portion 140 is formed by crimping the wire W near its base end. The crimped portion 140 is pushed into the gap 100 (see Figure 7) between the partition wall 78 and the locking projection 98 and is held in place by the gap 100.

[0068] (Features of Example 3) The reel 22 of this embodiment includes a bobbin 24 that is rotatably mounted on a rebar tying machine 2 around a predetermined rotation axis AX, and a wire W that is wound around the bobbin 24 and fed out from the bobbin 24 by the rebar tying machine 2. The bobbin 24 includes a body portion 64 including a cylindrical surface 62, a left flange portion 66 (example of a flange portion) that extends radially outward from the end of the cylindrical surface 62 toward the rotation axis AX, a first left-side notch portion 84 (example of a notch portion) that penetrates the left flange portion 66 in the thickness direction, and a wire locking portion 92 that is positioned outside the left flange portion 66 when viewed from the cylindrical surface 62. The wire locking portion 92 includes a slit 96 that is wider than the diameter of the wire W and is open to the space outside the left flange portion 66, and a locking wall 94 in which the slit 96 is formed. The wire W includes a retaining portion 112 positioned on the outside of the left flange portion 66 when viewed from the cylindrical surface 62, a relay portion 114 extending from the tip of the retaining portion 112, passing through the inside of the slit 96, and reaching the inside of the left flange portion 66, and a winding portion 116 extending from the tip of the relay portion 114 and wound around the cylindrical surface 62. A crushed portion 140 formed by crushing the wire W functions as the retaining portion 112.

[0069] With the above configuration, when the wire W is fed out from the bobbin 24, the retaining part 112 catches on the locking wall 94, thereby preventing the wire W from coming out of the bobbin 24. Furthermore, after the wire W (specifically, the winding portion 116 of the wire W) has been used up, the user can separate the wire W from the bobbin 24 by pulling the retaining part 112 away from the locking wall 94, or by moving the retaining part 112 so that the wire W is pulled out from the opening end 96b of the slit 96. Thus, with the above configuration, the wire W can be prevented from coming out of the bobbin 24, and after the wire W has been used up, it can be separated from the bobbin 24 with a simple operation.

[0070] (Example 4) As shown in Figure 12, the reel 22 of this embodiment differs from the reel 22 of Embodiment 1 in that, instead of a knot 120 (see Figure 9), a loop portion 150 formed by crimping two points of the wire W together functions as a retaining portion 112. The two points of the wire W are crimped together with a sleeve 152 that bundles them. The two points of the wire W may also be crimped together without using the sleeve 152. The loop portion 150 is pushed into the gap 100 (see Figure 7) between the partition wall 78 and the locking projection 98 and is held in place by the gap 100.

[0071] (Features of Example 4) In this embodiment, the loop portion 150 formed by crimping two points of the wire W together functions as a retaining portion 112.

[0072] When the wire W is fed out from the bobbin 24, a reaction force from the locking wall 94 acts on the retaining portion 112 that catches on the locking wall 94. This reaction force can cause the retaining portion 112 to deform (for example, the retaining portion 112 may bend, or the loop of wire W forming the retaining portion 112 may come undone). If the retaining portion 112 deforms, there is a risk that the catch between the retaining portion 112 and the locking wall 94 may be released unintentionally. With the above configuration, the retaining portion 112 is less likely to deform when the wire W is fed out from the bobbin 24. This makes it possible to suppress the unintentional release of the catch between the retaining portion 112 and the locking wall 94.

[0073] (Example 5) As shown in Figure 13, the reel 22 of this embodiment differs from the reel 22 of Embodiment 1 in that the retaining portion 112 is located in the right internal space 82 and the relay portion 114 passes through the inside of the through hole 102 and the inside of the slit 96. The retaining portion 112 is positioned so as not to interfere with the support cylinder (not shown) of the holder housing 16 (see Figure 1) that enters the right internal space 82. Also, the retaining portion 112 cannot pass through the through hole 102. When the wire W is fed out from the bobbin 24, the retaining portion 112 catches on the right surface 78a of the partition wall 78, thereby preventing the wire W from coming out of the bobbin 24. In this embodiment, after the wire W (specifically, the winding portion 116) has been used up, the wire W can be separated from the bobbin 24 by pulling the retaining portion 112 away from the right surface 78a of the partition wall 78 (i.e., to the right).

[0074] The retaining portion 112 may be any of the following, instead of a knot 120: the twisted portion 130 described in Example 2 (see Figure 10), the crushed portion 140 described in Example 3 (see Figure 11), or the loop portion 150 described in Example 4 (see Figure 12).

[0075] (Features of Example 5) The reel 22 of this embodiment includes a bobbin 24 that is rotatably mounted on a rebar tying machine 2 around a predetermined rotation axis AX, and a wire W that is wound around the bobbin 24 and fed out from the bobbin 24 by the rebar tying machine 2. The bobbin 24 includes a body portion 64 including a cylindrical surface 62, a left flange portion 66 (example of a flange portion) that extends radially outward from the end of the cylindrical surface 62 toward the rotation axis AX, a first left-side notch portion 84 (example of a notch portion) that penetrates the left flange portion 66 in the thickness direction, and a wire locking portion 92 that is positioned outside the left flange portion 66 when viewed from the cylindrical surface 62. The wire locking portion 92 includes a through hole 102 that is larger than the diameter of the wire W, and a locking wall 94 in which the through hole 102 is formed. The wire W includes a retaining portion 112 positioned on the outside of the left flange portion 66 when viewed from the cylindrical surface 62, a relay portion 114 extending from the tip of the retaining portion 112, passing through the inside of the through hole 102, and reaching the inside of the left flange portion 66, and a winding portion 116 extending from the tip of the relay portion 114 and wound around the cylindrical surface 62. One of the following functions as the retaining portion 112: a knot 120 formed by tying the wire W, a twisted section 130 formed by twisting the wire W, a crushed portion 140 formed by crushing the wire W, and a loop portion 150 formed by crimping two points of the wire W together.

[0076] With the above configuration, when the wire W is fed out from the bobbin 24, the retaining part 112 catches on the locking wall 94, thereby preventing the wire W from coming out of the bobbin 24. Furthermore, after the user has used up the wire W (specifically, the winding portion 116 of the wire W), they can separate the wire W from the bobbin 24 by pulling the retaining part 112 away from the locking wall 94. Therefore, with the above configuration, the wire W can be prevented from coming out of the bobbin 24, and after the wire W has been used up, it can be separated from the bobbin 24 with a simple operation.

[0077] (modified version) (See Figure 5) The wire locking portion 92 does not necessarily have to have a locking projection 98. That is, the bobbin 24 does not necessarily have to be configured to clamp the retaining portion 112 in the vicinity of the slit 96.

[0078] (See Figure 6) The base end 96a of the slit 96 does not have to be offset to the right of the right surface 66a of the left flange portion 66. That is, the base end 96a of the slit 96 may be offset to the left of the right surface 66a of the left flange portion 66.

[0079] (See Figure 9) At least a portion of the retaining portion 112 may be positioned radially outward from the cylindrical surface 62 on the rotation axis AX.

[0080] In the manufacturing method of the reel 22, the order in which the steps of forming a retaining portion 112 on the wire W, positioning the retaining portion 112 on the outside of the left flange portion 66 when viewed from the cylindrical surface 62, and passing the intermediate portion 114 of the wire W through the slit 96 may be interchanged. As in the embodiment, the above three steps may be performed in the order of passing through the intermediate portion 114, forming the retaining portion 112, and positioning the retaining portion 112. Alternatively, the above three steps may be performed in the order of forming the retaining portion 112, positioning the retaining portion 112, and passing through the intermediate portion 114. [Explanation of Symbols]

[0081] 2: Rebar tying machine, 4: Main body, 4a: Power switch, 4b: Setting switch, 4c: Display unit, 6: Grip, 10: Battery mounting part, 12: Reel holder, 14: Trigger, 16: Holder housing, 18: Cover member, 20: Rotating shaft, 22: Reel, 24: Bobbin, 32: Feeding mechanism, 34: Guide mechanism, 36: Cutting mechanism, 38: Twisting mechanism, 40: Feeding motor, 42: Motor, 44: Feeding roller, 46: Upper curl guide, 48: Lower curl guide, 50: Sleeve unit, 52: Gripping unit, 62: Cylindrical surface, 64: Body, 66: Left flange, 66a: Right side, 66b: Left side, 68: Right flange, 68a: Left side, 72: Outer cylindrical part, 74: Inner cylindrical section, 76: Connecting rib, 78: Partition wall, 78a: Right side, 78b: Left side, 80: Left internal space, 82: Right internal space, 84: First left notch, 86: Second left notch, 88: Right notch, 90: Identification projection, 92: Wire locking section, 94: Locking wall, 96: Slit, 96a: Base end, 96b: Open end, 98: Locking projection, 98a: Right side, 98b: Left side, 100: Gap, 102: Through hole, 112: Retaining section, 114: Intermediate section, 116: Winding section, 118: Tip section, 120: Knot, 130: Twist, 140: Crushed section, 150: Loop section, 152: Sleeve, AX: Rotating shaft, B: Battery pack, R: Reinforcement bar, W: Wire

Claims

1. A reel used in a rebar tying machine, A bobbin is rotatably mounted to the rebar tying machine around a predetermined axis of rotation, The system comprises a wire wound around the bobbin and fed out from the bobbin by the rebar tying machine, The bobbin mentioned above is A body including a cylindrical surface, A flange portion extending radially outward from the end of the cylindrical surface and the axis of rotation, A notch that penetrates the flange portion in the thickness direction, It comprises a wire locking portion positioned on the outside of the flange portion when viewed from the cylindrical surface, The wire locking portion is, A slit wider than the diameter of the wire is open in the space outside the flange portion, The device comprises a locking wall in which the aforementioned slit is formed, The aforementioned wire is A retaining portion is positioned on the outside of the flange portion when viewed from the cylindrical surface, and is formed by winding the wire in at least a loop. A relay portion extending from the tip of the retaining portion, passing through the inside of the slit, and reaching the inside of the flange portion, A reel comprising: a winding portion extending from the tip of the relay portion and wound around the cylindrical surface.

2. The reel according to claim 1, wherein the knot formed by tying the wires functions as the retaining part.

3. The reel according to claim 1, wherein the twist formed by twisting the wire functions as the retaining portion.

4. The reel according to claim 1, wherein the loop portion formed by crimping the two points of the wire together functions as the retaining portion.

5. A reel used in a rebar tying machine, A bobbin is rotatably mounted to the rebar tying machine around a predetermined axis of rotation, The system comprises a wire wound around the bobbin and fed out from the bobbin by the rebar tying machine, The bobbin mentioned above is A body including a cylindrical surface, A flange portion extending radially outward from the end of the cylindrical surface and the axis of rotation, A notch that penetrates the flange portion in the thickness direction, It comprises a wire locking portion positioned on the outside of the flange portion when viewed from the cylindrical surface, The wire locking portion is, A slit wider than the diameter of the wire is open in the space outside the flange portion, The device comprises a locking wall in which the aforementioned slit is formed, The aforementioned wire is A retaining portion is positioned on the outside of the flange portion when viewed from the cylindrical surface, A relay portion extending from the tip of the retaining portion, passing through the inside of the slit, and reaching the inside of the flange portion, It comprises a winding portion that extends from the tip of the relay portion and is wound around the cylindrical surface, A reel in which a crushed portion formed by crushing the wire functions as the retaining portion.

6. The wire locking portion is provided with a projection that protrudes from the locking wall around the slit, The reel according to any one of claims 1 to 5, wherein, when viewed along the direction from the opening end to the base end of the slit, at least a portion of the retaining portion is positioned to be hidden by the projection.

7. When the direction parallel to the rotation axis is defined as the first direction from the flange towards the cylindrical surface, and the direction from the cylindrical surface towards the flange towards the flange, The base end of the slit is offset in the first direction from the surface of the flange in the first direction, The reel according to any one of claims 1 to 6, wherein the opening end of the slit is offset in the second direction from the second direction surface of the flange portion.

8. A reel used in a rebar tying machine, A bobbin is rotatably mounted to the rebar tying machine around a predetermined axis of rotation, The system comprises a wire wound around the bobbin and fed out from the bobbin by the rebar tying machine, The bobbin mentioned above is A body including a cylindrical surface, A flange portion extending radially outward from the end of the cylindrical surface and the axis of rotation, A notch that penetrates the flange portion in the thickness direction, It comprises a wire locking portion positioned on the outside of the flange portion when viewed from the cylindrical surface, The wire locking portion is, A through hole larger than the diameter of the aforementioned wire, It comprises a locking wall in which the aforementioned through hole is formed, The aforementioned wire is A retaining portion is positioned on the outside of the flange portion when viewed from the cylindrical surface, A relay portion extending from the tip of the retaining portion, passing through the inside of the through hole, and reaching the inside of the flange portion, It comprises a winding portion that extends from the tip of the relay portion and is wound around the cylindrical surface, A reel in which one of the following functions as the retaining part: a knot formed by tying the wires together, a twist formed by twisting the wires, a crushed portion formed by crushing the wires, and a loop portion formed by crimping two points of the wires together.

9. The reel according to any one of claims 1 to 8, wherein the retaining portion is positioned radially inward of the rotation axis than the cylindrical surface.

10. A method for manufacturing reels used in rebar tying machines, The steps include preparing the wire and A step of preparing a bobbin that is rotatably mounted to the rebar tying machine around a predetermined axis of rotation, wherein the bobbin comprises a body portion including a cylindrical surface, a flange portion extending radially outward from the end of the cylindrical surface to the axis of rotation, a notch portion penetrating the flange portion in the thickness direction, and a wire locking portion positioned outside the flange portion as viewed from the cylindrical surface, wherein the wire locking portion comprises a slit wider than the diameter of the wire, open to the space outside the flange portion, and a locking wall in which the slit is formed, The steps include winding the wire at least into a loop to form a retaining portion on the wire, The steps include: positioning the retaining portion on the outside of the flange portion when viewed from the cylindrical surface; The steps include passing the relay portion of the wire extending from the tip of the retaining portion through the inside of the slit, A method comprising the step of winding the winding portion of the wire extending from the tip of the relay portion onto the cylindrical surface.

Images