Reinforcement binding machine

Abstract

To disclose a technique capable of preventing a second cutting blade from breaking.SOLUTION: A reinforcement binding machine binds reinforcing-bars using a wire. The reinforcement binding machine comprises a first cutting blade and a second cutting blade that cuts the wire by moving relative to the first cutting blade. The second cutting blade comprises a blade part that abuts to the wire and cuts the wire, a first connecting part connected to a first portion of the blade part, and a second connecting part connected to a second portion different from the first portion of the blade part.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] This specification relates to a steel bar tying machine.

Background Art

[0002] Patent Document 1 discloses a steel bar tying machine. The steel bar tying machine ties steel bars using a wire. The steel bar tying machine includes a first cutting blade and a second cutting blade that moves relative to the first cutting blade to cut the wire. The second cutting blade includes a blade portion that abuts against the wire to cut the wire, and a first connecting portion connected to a first location of the blade portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the blade portion cuts the wire, it receives a reaction force from the wire. In the above steel bar tying machine, when the blade portion receives a reaction force from the wire, stress concentrates in the vicinity of the blade portion and the first connecting portion. As a result, the second cutting blade may be damaged. This specification discloses a technique capable of suppressing damage to the second cutting blade. [[ID=3,7]]

Means for Solving the Problems

[0005] The steel bar tying machine disclosed in this specification ties steel bars using a wire. The steel bar tying machine includes a first cutting blade and a second cutting blade that moves relative to the first cutting blade to cut the wire. The second cutting blade includes a blade portion that abuts against the wire to cut the wire, a first connecting portion connected to a first location of the blade portion, and a second connecting portion connected to a second location different from the first location of the blade portion.

[0006] According to the above configuration, since the blade is connected to the first and second connection parts, when the blade receives a reaction force from the wire while cutting it, the stress is distributed to the vicinity of the blade and the first connection part, and to the vicinity of the blade and the second connection part. This helps to prevent damage to the second cutting blade.

[0007] The rebar tying machine disclosed herein ties rebars together using wire. The rebar tying machine comprises a housing and a cutting blade that cuts the wire when rotated relative to the housing. The cutting blade comprises a blade portion that contacts the wire to cut it, a first support portion that rotatably supports one side of the blade portion relative to the housing, and a second support portion that rotatably supports the other side of the blade portion relative to the housing. The first and second support portions receive the reaction force that the blade portion receives from the wire when the wire is cut.

[0008] According to the above configuration, the first support and the second support receive the reaction force that the blade receives from the wire when the wire is cut, so the stress is distributed in the vicinity of the blade and the first support, and in the vicinity of the blade and the second support. This makes it possible to suppress damage to the second cutting blade.

[0009] The rebar tying machine disclosed herein ties rebars together using wire. The rebar tying machine comprises a first cutting blade and a second cutting blade that cuts wire by moving relative to the first cutting blade. The second cutting blade comprises a blade portion that contacts and cuts the wire, a connecting portion connected to the blade portion, and at least one connecting portion. One of the blade portion and the connecting portion has at least one receiving portion that is recessed toward the interior of the other of the blade portion and the connecting portion. The connecting portion is connected to the blade portion by each of the at least one receiving portion receiving each of the at least one connecting portion.

[0010] According to the above configuration, when the blade receives a reaction force from the wire while cutting it, the stress is distributed to the boundary region between the connecting part and the receiving part. This helps to prevent damage to the second cutting blade. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view of the rebar tying machine 2 of the first embodiment, viewed from the front, right, and above. [Figure 2] This is a perspective view of the rebar tying machine 2 of the first embodiment, seen from the rear left and above. [Figure 3] This is a side view showing the internal configuration of the rebar tying machine 2 of the first embodiment. [Figure 4] This is a perspective view of the feed unit 34 of the first embodiment. [Figure 5] This is a cross-sectional view of the vicinity of the guide section 42 of the rebar tying machine 2 of the first embodiment. [Figure 6] This is a side view of the cutting unit 36 ​​and twisting unit 38 before the cutting unit 36 ​​of the first embodiment cuts the wire W. [Figure 7] This is an exploded perspective view of the cutting unit 36 ​​near the front end of the cutting unit 36 ​​in the first embodiment. [Figure 8] This is an exploded perspective view of the cutting unit 36 ​​near the front end of the cutting unit 36 ​​in the first embodiment. [Figure 9] This is a side view of the cutting unit 36 ​​and twisting unit 38 after the cutting unit 36 ​​of the first embodiment has cut the wire W. [Figure 10] This is a perspective view of the torsion unit 38 of the first embodiment. [Figure 11] This is a perspective view of the second cutting blade 80 of the first embodiment. [Figure 12] This is a perspective view of the second cutting blade 80 of the first embodiment. [Figure 13] This is a cross-sectional view of the second cutting blade 80 of the first embodiment. [Figure 14] This is a cross-sectional perspective view of the first cutting blade 78 and the second cutting blade 80 of the first embodiment. [Figure 15] This is an exploded perspective view of the second cutting blade 80 of the second embodiment. [Figure 16] This is a perspective view of the second cutting blade 80 of the third embodiment. [Figure 17] This is a perspective view of the second cutting blade 80 of the fourth embodiment. [Figure 18] Exploded perspective view of the second cutting blade 80 of the fourth embodiment. [Figure 19] Exploded perspective view of the second cutting blade 80 of the fourth embodiment. [Figure 20] Cross-sectional view of the second cutting blade 80 of the fourth embodiment. [Figure 21] Exploded perspective view of the second cutting blade 80 of the fifth embodiment. [Figure 22] Cross-sectional view of the second cutting blade 80 of the sixth embodiment. [Figure 23] Perspective view of the base member 74, the guide member 76, the second cutting blade 80, and the deformation prevention wall 500 of the seventh embodiment. [Figure 24] Cross-sectional view of the base member 74, the guide member 76, the second cutting blade 80, and the deformation prevention wall 500 of the seventh embodiment.

Best Mode for Carrying Out the Invention

[0012] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail 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. Further, the additional features and inventions disclosed below can be used separately or together with other features and inventions in order to provide a further improved reinforcing bar bundling machine, its manufacturing method, and its usage method.

[0013] 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. Further, the various features of the above and below representative specific examples, as well as the various features described in the independent and dependent claims, do not have to be combined as described in the specific examples herein or in the order listed when providing additional and useful embodiments of the present invention.

[0014] All features described herein and / or in the claims are intended to be disclosed individually and independently of each other, as limitations to the original disclosure and claimed specific subject matter, separate from the features described in the examples and / or claims. Furthermore, all descriptions of numerical ranges and groups or clusters are intended to disclose intermediate configurations as limitations to the original disclosure and claimed specific subject matter.

[0015] The rebar tying machine disclosed herein ties rebars together using wire. The rebar tying machine comprises a first cutting blade and a second cutting blade that cuts the wire by moving relative to the first cutting blade. The second cutting blade comprises a blade portion that contacts the wire to cut it, a first connecting portion connected to a first location on the blade portion, and a second connecting portion connected to a second location different from the first location on the blade portion.

[0016] In one or more embodiments, the first location of the blade may be located at one end of the blade. The second location of the blade may be located at the other end opposite to the first end of the blade.

[0017] Compared to a configuration where the first cutting edge is not located at one end of the blade and the second cutting edge is not located at the other end, the entire second cutting blade can be made more compact.

[0018] In one or more embodiments, the second cutting blade is defined by a blade portion, a first connecting portion, and a second connecting portion, and may further include a cutting hole that constitutes a through hole. The blade portion may cut a wire inserted into the cutting hole.

[0019] According to the above configuration, when the blade cuts the wire, it is possible to suppress the concentration of stress on the first or second connection point. This further reduces the risk of damage to the second cutting blade.

[0020] In one or more embodiments, the cross-section of the cutting hole may be formed in the blade portion and comprise a first side that contacts the wire and cuts the wire, a second side formed in the first connecting portion, and a third side that connects the first side and the second side. The third side may be curved.

[0021] If the cross-section of the cutting hole does not have a third side, when the blade cuts the wire, the stress concentrates at the connection point between the first and second sides. With the above configuration, when the blade cuts the wire, the stress is distributed across the curved third side. This further suppresses damage to the second cutting blade.

[0022] In one or more embodiments, the second side may extend in a straight line.

[0023] If the second side is bent, when the blade cuts the wire, stress will concentrate near the bend. With the above configuration, it is possible to suppress the concentration of stress near a specific point on the second side when the blade cuts the wire. This further reduces the risk of damage to the second cutting blade.

[0024] In one or more embodiments, the second side may be substantially perpendicular to the first side.

[0025] According to the above configuration, when the blade cuts the wire, it is possible to suppress the movement of the wire along the first edge.

[0026] In one or more embodiments, the second connection may be connected to the first connection.

[0027] With the above configuration, even if the blade receives a reaction force from the wire when cutting it, damage to the second cutting blade can be more effectively suppressed.

[0028] In one or more embodiments, the blade portion, the first connecting portion, and the second connecting portion may be formed integrally.

[0029] According to the above configuration, it is possible to suppress the complexity of the blade portion, the first connecting portion, and the second connecting portion.

[0030] In one or more embodiments, the second cutting blade may be rotatable relative to the first cutting blade.

[0031] With the above configuration, the space required to position the first and second cutting blades can be reduced compared to the case where the second cutting blade slides linearly relative to the first cutting blade.

[0032] The rebar tying machine disclosed herein ties rebars together using wire. The rebar tying machine comprises a housing and a cutting blade that cuts the wire when rotated relative to the housing. The cutting blade comprises a blade portion that contacts the wire to cut it, a first support portion that rotatably supports one side of the blade portion relative to the housing, and a second support portion that rotatably supports the other side of the blade portion relative to the housing. The first and second support portions receive the reaction force that the blade portion receives from the wire when the wire is cut.

[0033] The rebar tying machine disclosed herein ties rebars together using wire. The rebar tying machine comprises a first cutting blade and a second cutting blade that cuts wire by moving relative to the first cutting blade. The second cutting blade comprises a blade portion that contacts and cuts the wire, a connecting portion connected to the blade portion, and at least one connecting portion. One of the blade portion and the connecting portion has at least one receiving portion that is recessed toward the interior of the other of the blade portion and the connecting portion. The connecting portion is connected to the blade portion by each of the at least one receiving portion receiving each of the at least one connecting portion.

[0034] In one or more embodiments, the other of the blade portion and the connecting portion may be integrally formed with at least one connecting portion. Each of the at least one connecting portion may project outward from the other of the blade portion and the connecting portion.

[0035] The above configuration makes it possible to suppress the complexity of the second cutting blade's structure.

[0036] In one or more embodiments, the blade portion may have a cutting surface that contacts the wire and cuts the wire. The connecting portion may have a support surface that is connected to the cutting surface and is substantially perpendicular to the cutting surface.

[0037] According to the above configuration, when the blade cuts the wire, it is possible to suppress the movement of the wire on the cut surface.

[0038] (First embodiment) As shown in Figure 1, the rebar tying machine 2 ties multiple reinforcing bars R together using wire W. The rebar tying machine 2 uses wire W of various diameters (for example, from 0.5 mm to 2.5 mm in diameter) depending on the diameter of the reinforcing bars R used. For example, when tying small-diameter reinforcing bars R with a diameter of 16 mm or less (for example, 16 mm in diameter), wire W with a diameter of 1.6 mm or less (for example, 0.8 mm) is used, and when tying large-diameter reinforcing bars R with a diameter greater than 16 mm (for example, 25 mm or 32 mm in diameter), wire W with a diameter of 1.6 mm or more (for example, 2.0 mm) is used. Hereinafter, the longitudinal direction of the twisting unit 38 (see Figure 3) will be referred to as the front-to-back direction, the direction perpendicular to the front-to-back direction will be referred to as the up-and-down direction, and the direction perpendicular to both the front-to-back direction and the up-and-down direction will be referred to as the left-to-right direction.

[0039] The rebar tying machine 2 comprises a main body 4, a reel holder 6, and a battery pack B. The main body 4 comprises a left main body 8 that defines the external shape of the left half of the main body 4, a right main body 10 that defines the external shape of the right half of the main body 4, and a motor cover 12 attached to the outside of the right main body 10. The left main body 8 and the right main body 10 are fixed together by a number of screws S1. The right main body 10 and the motor cover 12 are fixed together by a number of screws S2.

[0040] The main unit 4 comprises a main unit housing 14, a grip 16, and a battery mounting section 18. The main unit housing 14, grip 16, and battery mounting section 18 are integrally formed. The grip 16 is held by the user. A trigger 20 is attached to the upper front of the grip 16. The battery pack B is detachable from the battery mounting section 18.

[0041] The reel holder 6 is attached to the front lower part of the main housing 14. As shown in Figure 2, the reel holder 6 is capable of accommodating the reel 24. Wire W is wound around the reel 24. With the cover 26 of the reel holder 6 open, the reel 24 can be attached to and detached from the reel holder 6.

[0042] As shown in Figure 3, the rebar tying machine 2 is equipped with a control circuit board 30. The control circuit board 30 is housed in the battery mounting section 18. When the trigger 20 is pressed, the control circuit board 30 performs a tying operation to tie the wire W to the rebar R.

[0043] The rebar tying machine 2 comprises a feeding unit 34, a cutting unit 36, and a twisting unit 38. The feeding unit 34 comprises a feeding section 40 and a guide section 42. The feeding section 40 is housed in the front of the main body housing 14. The guide section 42 is located in the front of the main body housing 14. The cutting unit 36 ​​and the twisting unit 38 are housed in the main body housing 14.

[0044] As shown in Figure 4, the feed unit 40 includes a feed motor 50, a reduction unit 52, a base member 54, a drive gear 56, a first feed gear 58, a second feed gear 60, a release lever 62, and a compression spring 64. The feed motor 50 is located on the right side of the right-side main body 10 (see Figure 1) and is covered by a motor cover 12 (see Figure 1). The feed motor 50 operates on power supplied from a battery pack B (see Figure 1). The feed motor 50 is, for example, a brushless motor. The feed motor 50 is controlled by a control circuit board 30 (see Figure 3). The reduction unit 52 reduces the rotation of the feed motor 50 and transmits it to the drive gear 56.

[0045] The base member 54 is fixed to the main body housing 14 (see Figure 1). The outer circumferential surface of the first feed gear 58 meshes with the outer circumferential surface of the second feed gear 60. The first feed gear 58 is rotatably supported by the base member 54. The first feed gear 58 rotates due to the rotation of the drive gear 56. The first feed gear 58 has a groove 58a that extends around its outer circumferential surface in a full circle around the axis of rotation. The first feed gear 58 contacts the wire W within the groove 58a. The second feed gear 60 is rotatably supported by the release lever 62. The second feed gear 60 has a groove 60a that extends around its outer circumferential surface in a full circle around the axis of rotation. The second feed gear 60 contacts the wire W within the groove 60a.

[0046] The release lever 62 is pivotably supported on the base member 54. The compression spring 64 biases the release lever 62 in the direction that the second feed gear 60 approaches the first feed gear 58. This causes the second feed gear 60 to press against the first feed gear 58. As a result, the wire W is sandwiched between the groove 58a of the first feed gear 58 and the groove 60a of the second feed gear 60. When the feed motor 50 rotates with the wire W sandwiched between the groove 58a of the first feed gear 58 and the groove 60a of the second feed gear 60, the wire W moves.

[0047] As shown in Figure 5, the guide section 42 includes an upper curl guide 66 and a lower curl guide 68. The upper curl guide 66 and the lower curl guide 68 protrude forward from the front end of the main housing 14. The upper curl guide 66 is open to the bottom. The upper curl guide 66 has an upper wire passage 70 which has an upwardly convex curved shape. The lower curl guide 68 is located below the upper curl guide 66. The lower curl guide 68 is open to the top. The lower curl guide 68 has a lower wire passage 72.

[0048] The wire W, fed by the first feed gear 58 and the second feed gear 60, is sent to the upper wire passage 70. As the wire W passes through the upper wire passage 70 from rear to front, it is given a downward curl by the upper curl guide 66. After passing through the upper wire passage 70, the wire W is sent to the lower wire passage 72. After passing through the lower wire passage 72 from front to rear, the wire W is sent towards the rear upper side. This causes the wire W to be wound around the reinforcing bar R.

[0049] As shown in Figure 6, the cutting unit 36 ​​includes a base member 74, a first fixing member 75 (see Figure 7), a guide member 76, a first cutting blade 78, a second cutting blade 80, a second fixing member 81 (see Figure 7), a first lever member 82, a second lever member 84, a first shaft 86, a second shaft 88, a link member 90, a torsion spring 92, a connecting pin 98, and a fixing pin 100.

[0050] The base member 74 is fixed to the main body housing 14 (see Figure 3) by a number of screws S3 (see Figure 3). The front end of the base member 74 is fixed to the lower curl guide 68 by a screw S4 and a pin P1 (see Figure 7).

[0051] As shown in Figures 7 and 8, the first fixing member 75 is positioned to the right of the base member 74, near the front end of the base member 74. The base member 74 and the first fixing member 75 are fixed together by screws S4 and S5 and a pin P1.

[0052] The guide member 76 is positioned to the left of the base member 74, near the front end of the base member 74. The base member 74 and the guide member 76 are fixed together by screws S5 and S6. The guide member 76 has a guide hole 76a. The width of the guide hole 76a gradually narrows from the bottom to the top and then becomes constant. As shown in Figure 5, the wire W fed by the first feed gear 58 and the second feed gear 60 (see Figure 4) passes through the guide hole 76a.

[0053] The first cutting blade 78 and the second cutting blade 80 are made of a high-strength material. The first cutting blade 78 and the second cutting blade 80 may be made of a metallic material or a ceramic material. The first cutting blade 78 and the second cutting blade 80 are made of, for example, alloy tool steel (SKS, SKD, SKT, SKH), high-speed tool steel (SKH), chromium steel (SCR), chromium-molybdenum steel (SCM), nickel-chromium steel (SNC), or nickel-chromium-molybdenum steel (SNC). The first cutting blade 78 and the second cutting blade 80 are also made of cemented carbide, for example, a material mainly composed of tungsten carbide, and this material may contain trace amounts of materials other than tungsten carbide. The first cutting blade 78 and the second cutting blade 80 are also made of, for example, high-speed tool steel (HSS).

[0054] As shown in Figures 7 and 8, the first cutting blade 78 has a substantially cylindrical shape. The first cutting blade 78 is provided with a first fixing portion 78a at its right end. The cross-section of the first fixing portion 78a is substantially rectangular. The first fixing member 75 has a first fixing hole 75a which is substantially rectangular in shape, and the first fixing portion 78a is inserted into the first fixing hole 75a. As a result, the first cutting blade 78 is fixed near the front end of the base member 74. The first cutting blade 78 is immovable relative to the main body housing 14 (see Figure 3). The first cutting blade 78 is provided with a first cutting hole 94 through which the wire W can pass. The first cutting hole 94 is located on the outer circumferential surface of the first cutting blade 78 and penetrates the first cutting blade 78. The first cutting hole 94 is provided with a fixed cutting blade portion 94a. The second cutting blade 80 is supported by the first cutting blade 78 so as to be rotatable by sliding around the first cutting blade 78. The second cutting blade 80 is rotatable relative to the main housing 14 (see Figure 3). The second cutting blade 80 is provided with a second cutting hole 96 through which the wire W can pass. The second cutting hole 96 is provided with a movable cutting blade portion 96a. The detailed structure of the second cutting blade 80 will be described later.

[0055] As shown in Figure 5, the first cutting blade 78, the second cutting blade 80, and the guide hole 76a are arranged on the passage through which the wire W is fed from the feed unit 40 toward the upper curl guide 66. The wire W, fed by the first feed gear 58 and the second feed gear 60 (see Figure 4), is guided by the guide hole 76a and passes through the first cutting hole 94 and the second cutting hole 96. With the wire W having passed through the first cutting hole 94 and the second cutting hole 96, when the second cutting blade 80 rotates around the first cutting blade 78 in the first direction D1 so as to close the first cutting hole 94, the wire W is cut by the fixed cutting blade portion 94a and the movable cutting blade portion 96a.

[0056] As shown in Figures 7 and 8, the second fixing member 81 is positioned to the left of the guide member 76, the first cutting blade 78, and the second cutting blade 80. The second fixing member 81 is fixed to the guide member 76 by a screw S7. The second fixing member 81 has a second fixing hole 81a and a third fixing hole 81b. The guide member 76 has a fixing projection 76b, which is inserted into the second fixing hole 81a. The first cutting blade 78 has a second fixing portion 78b at its left end, which is inserted into the third fixing hole 81b. The first cutting blade 78 is sandwiched between the first fixing member 75 and the second fixing member 81 and fixed to the first fixing member 75 and the second fixing member 81.

[0057] As shown in Figure 6, the first lever member 82 and the second lever member 84 are fixed by the first shaft 86 and the second shaft 88. The first shaft 86, which is inserted into the first lever member 82 and the second lever member 84, is fixed to the base member 74, and the first lever member 82 and the second lever member 84 rotate around the first shaft 86. The second shaft 88 is inserted into the lower ends of the first lever member 82 and the second lever member 84. When the first lever member 82 and the second lever member 84 rotate around the first shaft 86, the second shaft 88 moves together with the first lever member 82 and the second lever member 84. The first lever member 82 has a first projection 82a which is operated by the torsion unit 38. The second lever member 84 has a second projection 84a which is operated by the torsion unit 38.

[0058] The rear end of the link member 90 is fixed to the second shaft 88. The link member 90 is rotatable around the second shaft 88. The front end of the link member 90 is fixed to the second cutting blade 80 via a connecting pin 98.

[0059] The torsion spring 92 is attached to the first shaft 86. One end of the torsion spring 92 is in contact with the second shaft 88. A fixing pin 100 is fixed to the base member 74, and the other end of the torsion spring 92 is in contact with the fixing pin 100. The torsion spring 92 biases the second shaft 88 toward the front.

[0060] As shown in Figure 6, before the cutting unit 36 ​​cuts the wire W, the second shaft 88 is positioned in front of the first shaft 86. When the second projection 84a is operated toward the front, as shown in Figure 9, the second shaft 88 moves toward the rear, and the link member 90 moves toward the rear along with the movement of the second shaft 88. As a result, the second cutting blade 80 rotates in the first direction D1 (see Figure 6), and the wire W is cut.

[0061] As shown in Figure 10, the torsion unit 38 comprises a torsion motor 104, a reduction unit 106, and a holding unit 108. The torsion motor 104 and the reduction unit 106 are supported by the main housing 14 (see Figure 3). The torsion motor 104 operates on power supplied from the battery pack B (see Figure 3). The torsion motor 104 is, for example, a brushless motor. The torsion motor 104 is controlled by the control circuit board 30 (see Figure 3). The reduction unit 106 reduces the rotation of the torsion motor 104 and transmits it to the holding unit 108.

[0062] The holding unit 108 comprises a sleeve unit 110 and a holding unit 112. The sleeve unit 110 moves forward and backward and rotates in conjunction with the rotation of the torsion motor 104. The sleeve unit 110 is equipped with a push plate 114 located near its rear end. The push plate 114 moves forward and backward in conjunction with the rotation of the torsion motor 104, but does not rotate. As shown in Figures 6 and 9, when the sleeve unit 110 moves forward, the push plate 114 operates its second projection 84a toward the front, and when the sleeve unit 110 moves backward, it operates its first projection 82a toward the rear.

[0063] As shown in Figure 10, the holding unit 112 is inserted into the sleeve unit 110 from the front. The holding unit 112 comprises a shaft member 116, a left-side holding member 118, and a right-side holding member 120. When the rebar tying machine 2 is in its initial state before tying the rebar R, a left-side wire passage 122 is formed between the shaft member 116 and the left-side holding member 118, and a right-side wire passage 124 is formed between the shaft member 116 and the right-side holding member 120. The wire W can pass through the left-side wire passage 122 and the right-side wire passage 124. When the sleeve unit 110 moves forward, the right-side holding member 120 moves to the left relative to the shaft member 116. This narrows the right-side wire passage 124, and the wire W is clamped between the shaft member 116 and the right-side holding member 120. When the sleeve unit 110 moves further forward, the left-side holding member 118 moves to the right relative to the shaft member 116. This narrows the left wire passage 122, causing the wire W to be clamped between the shaft member 116 and the left holding member 118. After the wire W is cut, the sleeve unit 110 rotates, causing the wire W to twist.

[0064] As shown in Figures 11 and 12, the second cutting blade 80 comprises a base portion 130 and a side portion 132. The base portion 130 has a flat plate shape. The base portion 130 comprises a first wide surface 130a and a second wide surface 130b opposite to the first wide surface 130a. The first wide surface 130a faces the left side of the base member 74 (see Figure 7). The base portion 130 has a first opening 134 into which the first cutting blade 78 (see Figure 7) is inserted, and a second opening 136 into which the connecting pin 98 (see Figure 7) is inserted. The first opening 134 and the second opening 136 penetrate the base portion 130 in the thickness direction. The second cutting blade 80 rotates around the first cutting blade 78 with the first cutting blade 78 inserted into the first opening 134.

[0065] The side portion 132 is positioned on the periphery of the base portion 130. In Figures 11 and 12, the boundary between the base portion 130 and the side portion 132 is shown by a dashed line. The inner surface 132a of the side portion 132 faces the first cutting blade 78 when the first cutting blade 78 is inserted into the first opening 134. As shown in Figure 7, a groove 137 is formed in the base member 74, and a portion of the side portion 132 is positioned in the groove 137. When the second cutting blade 80 rotates around the first cutting blade 78 in a first direction D1 (see Figure 6), the side portion 132 moves within the groove 137 until its end face is just before a stepped portion 137a positioned at one end of the groove 137. As shown in Figures 11 and 12, the side portion 132 comprises a first support portion 138, a blade portion 140, and a second support portion 142. The first support portion 138, the blade portion 140, and the second support portion 142 are integrally formed.

[0066] The first support portion 138 comprises a support peripheral portion 144 and a support projection 146. The support peripheral portion 144 extends outward (to the right) from the periphery of the base portion 130 beyond the first wide surface 130a, and also extends outward (to the left) from the periphery of the base portion 130 beyond the second wide surface 130b. The support peripheral portion 144 is connected to the periphery of the base portion 130. The support peripheral portion 144 comprises a curved portion 148 that extends in a curved manner along the periphery of the first opening 134, and a straight portion 150 that extends in a straight line. The curved portion 148 is connected to the straight portion 150 at a connection point 152. The support projection 146 is connected to the support peripheral portion 144 near the connection point 152. The support projection 146 extends outward (to the right) from the right end of the support peripheral portion 144.

[0067] The blade portion 140 is connected to the right end of the support peripheral portion 144. In Figures 11 to 13, the boundary between the blade portion 140 and the support peripheral portion 144 is shown by a dashed line. The blade portion 140 is connected to the support peripheral portion 144 at the first location 154. The blade portion 140 is supported by the support peripheral portion 144 at the first location 154. It is located at one end (left end) of the blade portion 140. The blade portion 140 extends in a curved shape along the periphery of the first opening 134. The blade portion 140 is located away from the support projection 146 in the direction along the periphery of the first opening 134. The blade portion 140 faces the support projection 146. The blade portion 140 has a cutting edge 156 that is located facing the support projection 146. The cutting edge 156 constitutes the movable cutting blade portion 96a. The cutting edge 156 is sharply pointed. The cutting edge 156 contacts the wire W and cuts the wire W.

[0068] The second support portion 142 is connected to the right end of the blade portion 140 and the right end of the support projection 146, respectively. In Figures 11 to 14, the boundary between the second support portion 142 and the blade portion 140 and the boundary between the second support portion 142 and the support projection 146 are shown by dashed lines. The blade portion 140 is connected to the second support portion 142 at the second location 158. The blade portion 140 is supported by the second support portion 142 at the second location 158. The second location 158 is located within the blade portion 140 at the other end (right end) opposite to the first location 154. The second support portion 142 extends in a curved shape along the periphery of the first opening 134. The second support portion 142 is located apart from the support periphery portion 144 in the left-right direction. The second support portion 142 faces the support periphery portion 144.

[0069] The second cutting hole 96 is formed in the side portion 132. The second cutting hole 96 penetrates the side portion 132 from the inner surface 132a to the outer surface 132b. The second cutting hole 96 is defined by the end face of the blade portion 140, the left surface of the second support portion 142, the right surface of the support peripheral portion 144, and the end face of the support projection 146. The end face of the blade portion 140, the left surface of the second support portion 142, the right surface of the support peripheral portion 144, and the end face of the support projection 146 have a substantially planar shape. The second cutting hole 96 is formed by being surrounded by the blade portion 140, the second support portion 142, the support peripheral portion 144, and the support projection 146. The cutting edge 156 defines a portion of the second cutting hole 96. The cross-section of the second cutting hole 96 increases from the inner surface 132a of the side portion 132 toward the outer surface 132b. The outer surface 132b is the surface opposite to the inner surface 132a.

[0070] As shown in Figure 12, the cross-section of the second cutting hole 96 is substantially rectangular. The short side of the cross-section of the second cutting hole 96 extends along the left-right direction. The long side of the cross-section of the second cutting hole 96 extends in a direction perpendicular to the left-right direction. In modified examples, the cross-section of the second cutting hole 96 may be substantially elliptical or circular. Here, the cross-section of the second cutting hole 96 refers to the cross-section of the second cutting hole 96 along a plane perpendicular to the central axis of the second cutting hole 96, and the central axis of the second cutting hole 96 extends from the inner surface 132a of the side portion 132 toward the outer surface 132b, and is substantially perpendicular to the inner surface 132a and the outer surface 132b. The cross-section of the second cutting hole 96 comprises two first sides 162 and 164, two second sides 166 and 168, and four third sides 170, 172, 174, and 176. The first sides 162 and 164 correspond to the shorter sides of the cross-section of the second cutting hole 96. The first sides 162 and 164 extend linearly in the left-right direction. The first side 162 is formed on the cutting edge 156, and the first sides 162 and 164 are formed on the support projection 146. The first sides 162 and 164 are positioned opposite each other and are substantially parallel to each other. The length of the first sides 162 and 164 is substantially constant between the inner surface 132a and the outer surface 132b of the side portion 132.

[0071] The second sides 166 and 168 correspond to the longer sides of the cross-section of the second cutting hole 96. The second sides 166 and 168 extend in a straight line. The second side 166 is formed on the support periphery 144, and the second side 168 is formed on the second support portion 142. The second sides 166 and 168 are positioned opposite each other and are substantially parallel to each other. The second sides 166 and 168 are substantially perpendicular to the first sides 162 and 164. The length of the second sides 166 and 168 increases from the inner surface 132a to the outer surface 132b of the side portion 132.

[0072] The third sides 170, 172, 174, and 176 correspond to the corners of the cross-section of the second cutting hole 96. The third side 170 connects the first side 162 and the second side 166, the third side 172 connects the first side 162 and the second side 168, the third side 174 connects the first side 164 and the second side 166, and the third side 176 connects the first side 164 and the second side 168. The third sides 170, 172, 174, and 176 are curved. The radii of curvature of the third sides 170, 172, 174, and 176 are the same. In modified examples, the radii of curvature of the third sides 170, 172, 174, and 176 may be different. The lengths of the third sides 170, 172, 174, and 176 are approximately constant between the inner surface 132a and the outer surface 132b of the side portion 132.

[0073] The cutting behavior of the wire W is described below. When the second cutting blade 80 rotates around the first cutting blade 78 in the first direction D1 (see Figure 5), as shown in Figure 14, the first cutting hole 94 is gradually closed by the second cutting blade 80. The wire W is cut by being sandwiched between the fixed cutting blade portion 94a and the movable cutting blade portion 96a. At this time, the wire W is pressed against the fixed cutting blade portion 94a, and the fixed cutting blade portion 94a receives a reaction force F0 from the wire W. Note that only the cross-section of the wire W is shown in Figure 14. Also, as shown in Figure 13, the wire W is pressed against the cutting edge 156 (first side 162), which is the movable cutting blade portion 96a of the second cutting blade 80, and the cutting edge 156 receives a reaction force F1 from the wire W. Generally, this reaction force F1 (F0) increases as the diameter of the wire W increases and / or as the hardness of the wire W increases. The reaction force F1 acts on the cutting edge 156 in the direction from the support projection 146 (first side 164) toward the cutting edge 156. The support peripheral 144 and the second support 142 also receive the reaction force F1 via the cutting edge 140. The reaction force F1 is distributed and acts on the support peripheral 144 and the second support 142. Therefore, even when the cutting edge 156 receives the reaction force F1, the cutting edge 140 is less likely to deform in the direction that the cutting edge 156 moves away from the support projection 146. Furthermore, even when the cutting edge 156 receives the reaction force F1, the stress is distributed near the connection point (first point 154) between the cutting edge 140 and the support peripheral 144, and near the connection point (second point 158) between the cutting edge 140 and the second support 142. As a result, even when a large-diameter wire W with a diameter of 1.6 mm or more is used, and / or a high-hardness wire W is used, it is possible to suppress the breakage of the second cutting blade 80, for example, starting from the first point 154 or the second point 158. In addition, because the third sides 170 and 172 are curved, even if the cutting edge 156 receives a reaction force F1, the stress is distributed almost uniformly over the entire third side 170 and 172. As a result, it is possible to further suppress the breakage of the second cutting blade 80.

[0074] (effect) The rebar tying machine 2 of this embodiment ties reinforcing bars R using wire W. The rebar tying machine 2 includes a first cutting blade 78 and a second cutting blade 80 that cuts the wire W by moving relative to the first cutting blade 78. The second cutting blade 80 includes a blade portion 140 that contacts the wire W and cuts the wire W, a first support portion 138 (an example of a first connection portion) connected to a first location 154 of the blade portion 140, and a second support portion 142 (an example of a second connection portion) connected to a second location 158 different from the first location 154 of the blade portion 140.

[0075] According to the above configuration, since the blade portion 140 is connected to the first support portion 138 and the second support portion 142, when the blade portion 140 receives a reaction force F1 from the wire W when cutting the wire W, the stress is distributed to the vicinity of the blade portion 140 and the first support portion 138, and to the vicinity of the blade portion 140 and the second support portion 142. This makes it possible to suppress damage to the second cutting blade 80.

[0076] Furthermore, the first location 154 of the blade portion 140 is located at one end of the blade portion 140. The second location 158 of the blade portion 140 is located at the other end opposite to the one end of the blade portion 140.

[0077] Compared to a configuration in which the first location 154 of the blade portion 140 is not located at one end of the blade portion 140, and the second location 158 of the blade portion 140 is not located at the other end of the blade portion 140, the entire second cutting blade 80 can be made more compact.

[0078] Furthermore, the second cutting blade 80 is defined by a blade portion 140, a first support portion 138, and a second support portion 142, and further includes a second cutting hole 96 (an example of a cutting hole) that constitutes a through hole. The blade portion 140 cuts the wire W inserted into the second cutting hole 96.

[0079] According to the above configuration, when the blade portion 140 cuts the wire W, it is possible to suppress the concentration of stress on the first support portion 138 or the second support portion 142. This further suppresses damage to the second cutting blade 80.

[0080] Furthermore, the cross-section of the second cutting hole 96 is formed in the blade portion 140 and includes a first side 162 that contacts the wire W and cuts the wire W, a second side 166 formed in the first support portion 138, and a third side 170 that connects the first side 162 and the second side 166. The third side 170 is curved.

[0081] If the cross-section of the second cutting hole 96 does not have a third side 170, then when the blade portion 140 cuts the wire W, the stress is concentrated at the connection point between the first side 162 and the second side 166. With the above configuration, when the blade portion 140 cuts the wire W, the stress is distributed across the curved third side 170. This further suppresses damage to the second cutting blade 80.

[0082] Furthermore, the second side, 166, extends in a straight line.

[0083] If the second side 166 is bent, when the blade 140 cuts the wire W, stress will concentrate near the bend. With the above configuration, it is possible to suppress the concentration of stress near a specific point on the second side 166 when the blade 140 cuts the wire W. This further reduces the risk of damage to the second cutting blade 80.

[0084] Furthermore, the second side 166 is approximately perpendicular to the first side 162.

[0085] According to the above configuration, when the blade portion 140 cuts the wire W, it is possible to suppress the movement of the wire W along the first side 162.

[0086] Furthermore, the second support portion 142 is connected to the first support portion 138.

[0087] With the above configuration, even if the blade portion 140 receives a reaction force F1 from the wire W when cutting the wire W, damage to the second cutting blade 80 can be further suppressed.

[0088] Furthermore, the blade portion 140, the first support portion 138, and the second support portion 142 are integrally formed.

[0089] According to the above configuration, it is possible to suppress the complexity of the structure of the blade portion 140, the first support portion 138, and the second support portion 142.

[0090] Furthermore, the second cutting blade 80 is rotatable relative to the first cutting blade 78.

[0091] With the above configuration, the space required to position the first cutting blade 78 and the second cutting blade 80 can be reduced compared to the case where the second cutting blade 80 slides linearly relative to the first cutting blade 78.

[0092] The rebar tying machine 2 disclosed herein ties reinforcing bars R using wire W. The rebar tying machine 2 comprises a main housing 14 (an example of a housing) and a second cutting blade 80 (an example of a cutting blade) that cuts the wire W by rotating relative to the main housing 14. The second cutting blade 80 comprises a blade portion 140 that contacts the wire W and cuts the wire W, a first support portion 138 that rotatably supports one side of the blade portion 140 relative to the main housing 14, and a second support portion 142 that rotatably supports the other side of the blade portion 140 relative to the main housing 14. The first support portion 138 and the second support portion 142 receive the reaction force F1 that the blade portion 140 receives from the wire W when the wire W is cut.

[0093] According to the above configuration, the first support portion 138 and the second support portion 142 receive the reaction force F1 that the blade portion 140 receives from the wire W when the wire W is cut, so the stress is distributed between the vicinity of the blade portion 140 and the first support portion 138, and between the vicinity of the blade portion 140 and the second support portion 142. This makes it possible to suppress damage to the second cutting blade 80.

[0094] (Second example) In the second embodiment, only the differences from the first embodiment will be described. As shown in Figure 15, in the second embodiment, the second support portion 142 of the second cutting blade 80 is separate from the first support portion 138 and the blade portion 140. The second support portion 142 is detachable from the first support portion 138 and the blade portion 140.

[0095] The first support portion 138 is provided with a first projection 200. The first projection 200 protrudes outward (to the right) from the right end of the support projection 146. The blade portion 140 is provided with a second projection 202. The second projection 202 protrudes outward (to the right) from the right end of the blade portion 140.

[0096] The second support portion 142 comprises a first receiving portion 204 and a second receiving portion 206. The first receiving portion 204 and the second receiving portion 206 are recessed inward (to the right) from the left side of the second support portion 142. When the second support portion 142 is connected to the first support portion 138 and the blade portion 140, the first receiving portion 204 is fitted with the first projection portion 200 by receiving the first projection portion 200, and the second receiving portion 206 is fitted with the second projection portion 202 by receiving the second projection portion 202.

[0097] (Correspondence) The first cutting blade 78, the second cutting blade 80, the blade portion 140, the first support portion 138, and the second support portion 142 are examples of the first cutting blade, the second cutting blade, the blade portion, the first connecting portion, and the second connecting portion, respectively. The first location 154 and the second location 158 are examples of the first location and the second connecting portion, respectively. The second cutting hole 96, the first side 162, the second side 166, and the third side 170 are examples of the cutting hole, the first side, the second side, and the third side, respectively.

[0098] (Third embodiment) In the third embodiment, only the differences from the first embodiment will be described. As shown in Figure 16, in the third embodiment, the shape of the second support portion 142 of the second cutting blade 80 is different from the shape of the second support portion 142 of the first embodiment, and the first support portion 138 does not have a support projection 146.

[0099] The second support portion 142 is connected to the right end of the blade portion 140. The second support portion 142 has a ring shape. The second support portion 142 has an insertion opening 300 that penetrates the second support portion 142 in the thickness direction (left-right direction). The insertion opening 300 is positioned opposite the first opening 134 of the base portion 130. The second cutting blade 80 is supported by the first cutting blade 78 (see Figure 7) by inserting the first cutting blade 78 into the first opening 134 and the insertion opening 300.

[0100] (Correspondence) The first cutting blade 78, the second cutting blade 80, the blade portion 140, the first support portion 138, and the second support portion 142 are examples of the first cutting blade, the second cutting blade, the blade portion, the first connecting portion, and the second connecting portion, respectively. The first location 154 and the second location 158 are examples of the first location and the second connecting portion, respectively. The second cutting hole 96, the first side 162, the second side 166, and the third side 170 are examples of the cutting hole, the first side, the second side, and the third side, respectively.

[0101] (Fourth embodiment) In the fourth embodiment, only the differences from the first embodiment will be described. As shown in Figure 17, in the fourth embodiment, the side portion 132 of the second cutting blade 80 does not have the second support portion 142 of the first embodiment.

[0102] As shown in Figure 18, the blade portion 140 is separate from the first support portion 138. The blade portion 140 includes a first receiving portion 400 and a second receiving portion 402. The first receiving portion 400 and the second receiving portion 402 are recessed inward (to the right) from the left side of the blade portion 140. The first receiving portion 400 and the second receiving portion 402 are arranged side by side along the periphery of the first opening 134.

[0103] As shown in Figure 19, the first support portion 138 includes a third receiving portion 404 and a fourth receiving portion 406. The third receiving portion 404 and the fourth receiving portion 406 are recessed inward (to the left) from the right end of the support peripheral portion 144. The third receiving portion 404 is positioned opposite the first receiving portion 400, and the fourth receiving portion 406 is positioned opposite the second receiving portion 402. The third receiving portion 404 and the fourth receiving portion 406 are positioned side by side along the periphery of the first opening 134.

[0104] The side portion 132 further comprises a first connecting portion 408 and a second connecting portion 410. The first connecting portion 408 and the second connecting portion 410 are separate from the first support portion 138 and the blade portion 140, respectively. The first connecting portion 408 and the second connecting portion 410 have a substantially cylindrical shape. The first connecting portion 408 and the second connecting portion 410 are, for example, connecting pins. The first connecting portion 408 and the second connecting portion 410 are made of a high-strength material. The first connecting portion 408 and the second connecting portion 410 may be made of a metal material or a ceramic material. The first connecting portion 408 and the second connecting portion 410 are made of, for example, alloy tool steel (SKS, SKD, SKT, SKH), high-speed tool steel (SKH), chromium steel (SCR), chromium-molybdenum steel (SCM), nickel-chromium steel (SNC), or nickel-chromium-molybdenum steel (SNC). Alternatively, the first connecting portion 408 and the second connecting portion 410 are made of cemented carbide, for example, a material mainly composed of tungsten carbide, which may contain trace amounts of materials other than tungsten carbide. Furthermore, the first connecting portion 408 and the second connecting portion 410 are made of, for example, high-speed tool steel (HSS). The strength of both the first connecting portion 408 and the second connecting portion 410 is higher than the strength of the first support portion 138 and the strength of the cutting edge portion 140, respectively.

[0105] As shown in Figures 18 and 19, the first connecting portion 408 is fitted to the first receiving portion 400 and the third receiving portion 404 by being received by the first receiving portion 400 and the third receiving portion 404, respectively. Similarly, the second connecting portion 410 is fitted to the second receiving portion 402 and the fourth receiving portion 406 by being received by the second receiving portion 402 and the fourth receiving portion 406, respectively. As a result, the blade portion 140 is connected (fixed) to the first support portion 138 via the first connecting portion 408 and the second connecting portion 410.

[0106] As shown in Figure 20, the second cutting hole 96 is defined by the end face of the blade portion 140, the right face of the support peripheral portion 144, and the end face of the support projection 146. The right end of the second cutting hole 96 is open (not closed). The cross-section of the second cutting hole 96 comprises first sides 162 and 164 and a second side 166. The first side 162 is formed at the cutting edge 156 of the blade portion 140. The first side 164 is formed at the support projection 146. The second side 166 is formed at the support peripheral portion 144. The second side 166 is connected to the first sides 162 and 164, respectively. The second side 166 is approximately perpendicular to the first sides 162 and 164, respectively.

[0107] As the second cutting blade 80 rotates around the first cutting blade 78 (see Figure 5) in the first direction D1 (see Figure 5), and the cutting edge 156 of the blade portion 140 cuts the wire W, the wire W is pressed against the cutting edge 156 (first side 162). As shown in Figure 20, the cutting edge 156 receives a reaction force F2 from the wire W. The reaction force F2 acts on the cutting edge 156 in the direction from the support projection 146 (first side 164) toward the cutting edge 156. The first connecting portion 408, the second connecting portion 410 (see Figures 16 and 17), and the support peripheral portion 144 also receive the reaction force F2 via the blade portion 140. At this time, the stress is distributed substantially uniformly at the boundary between the first connecting portion 408 and the blade portion 140, the boundary between the first connecting portion 408 and the support peripheral portion 144, the boundary between the second connecting portion 410 and the blade portion 140, and the boundary between the second connecting portion 410 and the support peripheral portion 144. As a result, even if the cutting edge 156 receives a reaction force F2, damage to the second cutting blade 80, for example, the blade portion 140, can be suppressed.

[0108] (effect) The rebar tying machine 2 of this embodiment ties reinforcing bars R using wire W. The rebar tying machine 2 includes a first cutting blade 78 and a second cutting blade 80 that cuts the wire W by moving relative to the first cutting blade 78. The second cutting blade 80 includes a blade portion 140 that contacts the wire W to cut it, a first support portion 138 (an example of a connection portion) connected to the blade portion 140, and a first connecting portion 408 and a second connecting portion 410 (an example of at least one connecting portion). One of the blade portion 140 and the first support portion 138 is recessed toward the interior of the other of the blade portion 140 and the first support portion 138, and includes a first receiving portion 400 and a second receiving portion 402 (a third receiving portion 404 and a fourth receiving portion 406) (an example of at least one receiving portion) that receive the first connecting portion 408 and the second connecting portion 410. The first support portion 138 is connected to the blade portion 140 by the first receiving portion 400 (or third receiving portion 404) receiving the first connecting portion 408 and the second receiving portion 402 (or fourth receiving portion 406).

[0109] According to the above configuration, when the blade portion 140 receives a reaction force F2 from the wire W when cutting the wire W, the stress is distributed to the boundary region between the first connecting portion 408 and the first receiving portion 400 (or the third receiving portion 404) and the boundary region between the second connecting portion 410 and the second receiving portion 402 (or the fourth receiving portion 406). This makes it possible to suppress damage to the second cutting blade 80.

[0110] Furthermore, the blade portion 140 is provided with a first side 162 (an example of a cutting surface) that contacts the wire W and cuts the wire W. The first support portion 138 is connected to the first side 162 and is provided with a second side 166 (an example of a support surface) that is substantially perpendicular to the first side 162.

[0111] According to the above configuration, when the blade portion 140 cuts the wire W, it is possible to suppress the movement of the wire W along the first side 162.

[0112] (Fifth example) In the fifth embodiment, only the differences from the fourth embodiment will be described. As shown in Figure 21, in the fifth embodiment, the first connecting portion 408 and the second connecting portion 410 are integrally formed with the first support portion 138. The first support portion 138 does not include the third receiving portion 404 and the fourth receiving portion 406 of the fourth embodiment.

[0113] The first connecting portion 408 and the second connecting portion 410 protrude outward (to the right) from the right end of the support peripheral portion 144. The first connecting portion 408 is fitted with the first receiving portion 400 by being received by the first receiving portion 400. The second connecting portion 410 is fitted with the second receiving portion 402 by being received by the second receiving portion 402. As a result, the blade portion 140 is connected (fixed) to the first support portion 138.

[0114] In a modified example, the first connecting portion 408 and the second connecting portion 410 are integrally formed with the blade portion 140 and may protrude outward (to the left) from the left side of the blade portion 140. In this case, the blade portion 140 does not include the first receiving portion 400 and the second receiving portion 402.

[0115] (effect) In this embodiment, the other end of the blade portion 140 and the first support portion 138 is integrally formed with the first connecting portion 408 and the second connecting portion 410. The first connecting portion 408 and the second connecting portion 410 protrude outward from the other end of the blade portion 140 and the first support portion 138.

[0116] According to the above configuration, it is possible to suppress the complexity of the configuration of the second cutting blade 80.

[0117] (Sixth embodiment) In the sixth embodiment, only the differences from the fourth embodiment will be described. As shown in Figure 22, in the sixth embodiment, the shape of the second cutting hole 96 is different from the shape of the second cutting hole 96 in the fourth embodiment. Also, the first support portion 138, the blade portion 140, the first connecting portion 408 (see Figure 18), and the second connecting portion 410 (see Figure 18) are integrally formed. The second cutting blade 80 consists of a single part.

[0118] The first side 162 of the second cutting hole 96 is inclined with respect to the first side 164. Furthermore, the first side 162 is inclined with respect to the second side 166 at an angle A1 that is not approximately 90 degrees. The angle A1 formed by the first side 162 and the second side 166 is obtuse. The angle A1 is greater than 90 degrees and less than or equal to 135 degrees. In this embodiment, the angle A1 is 105 degrees.

[0119] When the second cutting blade 80 rotates around the first cutting blade 78 (see Figure 5) in the first direction D1 (see Figure 5), and the cutting edge 156 of the blade portion 140 cuts the wire W, the wire W is pressed against the cutting edge 156 (first side 162). As shown in Figure 22, the cutting edge 156 receives a reaction force F3 from the wire W. The reaction force F3 acts on the cutting edge 156 in the direction from the support projection 146 (first side 164) toward the cutting edge 156. Because the angle A1 is obtuse, stress is suppressed from concentrating near the connection point between the blade portion 140 and the support peripheral portion 144 (near the connection point between the first side 162 and the second side 166). Even when the cutting edge 156 receives a reaction force F3, the blade portion 140 is less likely to deform in the direction that the cutting edge 156 moves away from the support projection 146. This prevents the second cutting blade 80 from being damaged, for example, starting from the connection point (first location 154) between the blade portion 140 and the support peripheral edge portion 144.

[0120] In a modified example, the first support portion 138, the blade portion 140, the first connecting portion 408 (see Figure 18), and the second connecting portion 410 (see Figure 18) may be separate components.

[0121] (Seventh Example) In the seventh embodiment, only the differences from the fourth embodiment will be described. As shown in Figure 23, in the seventh embodiment, the cutting unit 36 ​​further includes a deformation prevention wall 500. Also, the first support portion 138, the blade portion 140, the first connecting portion 408 (see Figure 18), and the second connecting portion 410 (see Figure 18) are integrally formed. The second cutting blade 80 consists of a single part. In Figures 23 and 24, the first cutting blade 78 is omitted from the illustration to make it easier to understand the shapes of the second cutting blade 80 and the deformation prevention wall 500.

[0122] The deformation prevention wall 500 is integrally formed with the guide member 76. The deformation prevention wall 500 protrudes from the guide member 76 in a direction away from the left side of the base member 74 (to the left). The deformation prevention wall 500 extends along the side portion 132 of the second cutting blade 80. The deformation prevention wall 500 is curved along the outer surface 132b of the side portion 132. The deformation prevention wall 500 faces the side portion 132.

[0123] As shown in Figure 24, when the second cutting blade 80 rotates in the first direction D1 around the first cutting blade 78 (see Figure 5) and the cutting edge 156 of the blade portion 140 cuts the wire W, the wire W is pressed against the cutting edge 156 (first side 162). As shown in Figure 24, the cutting edge 156 receives a reaction force F4 from the wire W. The reaction force F4 acts on the cutting edge 156 in the direction from the support projection 146 (first side 164) toward the cutting edge 156. As the cutting edge 156 receives the reaction force F4, the blade portion 140 comes into contact with the deformation prevention wall 500 and becomes less likely to deform in the direction away from the support projection 146. This makes it possible to suppress damage to the second cutting blade 80, for example, starting from the connection point (first location 154) between the blade portion 140 and the support peripheral edge 144.

[0124] In a modified example, the first support portion 138, the blade portion 140, the first connecting portion 408 (see Figure 18), and the second connecting portion 410 (see Figure 18) may be separate components.

[0125] (modified version) In one embodiment, each embodiment may be combined. For example, the cutting unit 36 ​​of the first to sixth embodiments may include the deformation prevention wall 500 of the seventh embodiment. Also, for example, in the first to fifth embodiments and the seventh embodiment, the angle A1 formed by the first side 162 and the second side 166 may be an obtuse angle. Furthermore, for example, in the first to third embodiments, the blade portion 140 and the support peripheral portion 144 may be connected via the first connecting portion 408 and the second connecting portion 410 of the fourth embodiment, and the blade portion 140 and the second support portion 142 may be connected via the first connecting portion 408 and the second connecting portion 410 of the fourth embodiment.

[0126] In one embodiment, the second cutting blade 80 may cut the wire W by sliding linearly relative to the first cutting blade 78.

[0127] In one embodiment, the first cutting blade 78 may be movable relative to the main body housing 14.

[0128] In one embodiment, the second cutting blade 80 may have only one of the first connecting portion 408 and the second connecting portion 410. Alternatively, the second cutting blade 80 may have one or more additional connecting portions in addition to the first connecting portion 408 and the second connecting portion 410. [Explanation of Symbols]

[0129] 2: Rebar tying machine 34: Feed Unit 36: Cutting Unit 38: Twist Unit 74: Base component 78: 1st cutting blade 80: 2nd cutting blade 94: 1st cutting hole 96: 2nd cutting hole 130: Base 132: Side 138: 1st support part 140: Blade part 142:Second support part 144: Support periphery 146: Support protrusion 154: First section 156: Blade tip 158: Second location 162, 164: First side 166, 168: Second side 170, 172, 174, 176: Third side 200: 1st protrusion 202:Second protrusion 204: 1st reception department 206:Second reception department 300: Insertion opening 400: 1st reception department 402:Second reception department 404: 3rd reception department 406: 4th reception department 408 :1st connection part 410:Second connection part 500: Deformation prevention wall B: Battery pack F0, F1, F2, F3, F4: Reaction force R: Reinforcement bars W: wire

Claims

1. A rebar tying machine that ties rebars using wires, A first cutting blade; a second cutting blade that cuts the wire by moving relative to the first cutting blade, The second cutting blade is a blade portion that comes into contact with the wire to cut the wire; A first connection portion connected to a first location of the blade portion; A second connection portion connected to a second location different from the first location of the blade portion.

2. the first portion of the blade portion is disposed at one end of the blade portion; The reinforcing bar tying machine according to claim 1 , wherein the second location of the blade portion is disposed at the other end opposite the one end of the blade portion.

3. the second cutting blade is defined by the blade portion, the first connecting portion, and the second connecting portion, and further includes a cutting hole that constitutes a through hole, The rebar tying machine according to claim 1 , wherein the blade portion cuts the wire inserted into the cutting hole.

4. The cross section of the cut hole is a first side formed on the blade portion and adapted to come into contact with the wire to cut the wire; A second side formed on the first connection portion; a third side connecting the first side and the second side, The rebar tying machine of claim 3 , wherein the third side is curved.

5. The rebar tying machine according to claim 4 , wherein the second side extends in a straight line.

6. The rebar binding machine according to claim 4 , wherein the second side is substantially perpendicular to the first side.

7. The rebar binding machine according to claim 1 , wherein the second connection portion is connected to the first connection portion.

8. The reinforcing bar tying machine according to claim 1 , wherein the blade portion, the first connection portion, and the second connection portion are integrally formed.

9. The rebar tie machine of claim 1 , wherein the second cutting blade is rotatable relative to the first cutting blade.

10. A rebar tying machine that ties rebars using wires, Housing and a cutting blade that is rotated relative to the housing to cut the wire, The cutting blade is a blade portion that comes into contact with the wire to cut the wire; a first support portion that supports one side of the blade portion rotatably relative to the housing; a second support portion that supports the other side of the blade portion rotatably relative to the housing, A rebar tying machine in which the first support portion and the second support portion receive a reaction force that the blade portion receives from the wire when the wire is cut.

11. A rebar tying machine that ties rebars using wires, A first cutting blade; a second cutting blade that cuts the wire by moving relative to the first cutting blade, The second cutting blade is a blade portion that comes into contact with the wire to cut the wire; A connection portion connected to the blade portion; At least one coupling portion, one of the blade portion and the connecting portion includes at least one receiving portion recessed toward an inside of the one of the blade portion and the connecting portion; A rebar tying machine, wherein each of the at least one receiving portions receives each of the at least one connecting portion, thereby connecting the connection portion to the blade portion.

12. the other of the blade portion and the connecting portion is integrally formed with the at least one connecting portion, The rebar tie machine of claim 11 , wherein each of the at least one coupling portion protrudes outwardly from the other of the blade portion and the connection portion.

13. The blade portion has a cutting surface that comes into contact with the wire to cut the wire, The rebar tie machine of claim 11, wherein the connection portion has a support surface connected to the cutting surface and substantially perpendicular to the cutting surface.

Images