Reinforcing bar binding machine

Abstract

To provide a technique capable of suppressing wear of a contact member even when a binding operation is repeatedly performed.SOLUTION: A reinforcing bar binding machine binds reinforcing bars using a wire. The reinforcing bar binding machine includes a contact member that comes into contact with the wire during a binding operation in which the reinforcing bar binding machine uses the wire to bind the reinforcing bars. The contact member includes a base material, and a surface layer covering at least a portion of a surface of the base material and in contact with the wire during the binding operation. The hardness of the surface layer is higher than that of the base material.SELECTED DRAWING: Figure 11

Description

Technical field

[0001] The present specification relates to a reinforcing bar tying machine. [Background technology]

[0002] Patent Document 1 discloses a reinforcing bar tying machine. A reinforcing bar binding machine binds reinforcing bars using wire. The reinforcing bar tying machine includes a first contact member that comes into contact with the wire during a tying operation in which the reinforcing bar tying machine binds the reinforcing bars using the wire. The reinforcing bar binding machine also includes a second contact member and a third contact member that contacts the second contact member and moves relative to the second contact member during the binding operation. [Prior art documents] [Patent document]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2004-59017 [Summary of the invention] [Problem to be solved by the invention]

[0004] When the above-mentioned rebar tying machine repeatedly performs the tying operation, the first contact member may wear out due to contact with the wire, and the second and third contact members may wear out due to rubbing against each other. There are things to do. The present specification provides a technique that can suppress wear of a contact member even if a binding operation is repeatedly performed. [Means to solve the problem]

[0005] The reinforcing bar binding machine disclosed in this specification binds reinforcing bars using wire. The reinforcing bar tying machine includes a contact member that comes into contact with the wire during a tying operation in which the reinforcing bar tying machine binds the reinforcing bars using the wire. The contact member includes a base material and a surface layer that covers at least a portion of the surface of the base material and contacts the wire during a tying operation. The hardness of the surface layer is higher than that of the base material.

[0006] According to the above configuration, since the hardness of the surface layer is higher than the hardness of the base material, the surface layer of the contact member is less likely to wear out even when it comes into contact with the wire, compared to a case where the contact member is made of only the base material. Even if the binding operation is repeatedly performed, wear of the contact member can be suppressed.

[0007] The reinforcing bar binding machine disclosed in this specification binds reinforcing bars using wire. The rebar tying machine has a first contact member and a second contact member that contacts the first contact member and moves relative to the first contact member during a tying operation in which the rebar tying machine binds reinforcing bars using wire. A contact member. The first contact member includes a first base material and a first surface layer covering at least a portion of the surface of the first base material. The second contact member includes a second base material and a second surface layer that covers at least a portion of the surface of the second base material and contacts the first surface layer during a binding operation. The hardness of the first surface layer is higher than the hardness of the first base material. The hardness of the second surface layer is higher than the hardness of the second base material.

[0008] According to the above configuration, since the hardness of the first surface layer is higher than the hardness of the first base material and the hardness of the second surface layer is higher than the hardness of the second base material, the first contact member is connected only to the first base material. The first surface layer of the first contact member and the second surface layer of the second contact member are less likely to wear out even when they come into contact with each other, compared to the case where the second contact member is comprised only of the second base material. Even if the binding operation is repeatedly performed, wear of the first contact member and the second contact member can be suppressed.

[0009] The reinforcing bar binding machine disclosed in this specification binds reinforcing bars using wire. The reinforcing bar binding machine includes a feed roller that feeds the wire toward the reinforcing bars when the reinforcing bar binding machine uses wire to bind the reinforcing bars. The hardness of the surface layer of the feed roller is 900HV or more. Note that HV represents Vickers hardness.

[0010] The feed roller contacts the wire as it feeds the wire toward the reinforcing steel. According to the above configuration, since the hardness of the surface layer of the feed roller is 900 HV or more, the surface layer of the feed roller is not easily abraded even when it comes into contact with the wire. Even if the binding operation is repeatedly performed, it is possible to suppress the feed roller from being worn out.

[0011] The reinforcing bar binding machine disclosed in this specification binds reinforcing bars using wire. The reinforcing bar binding machine includes a first feed roller that comes into contact with the wire when the wire is sent out toward the reinforcing bars and is rotated by a motor, and a second feed roller that comes into contact with the wire when the wire is sent out toward the reinforcing bars. It is equipped with The wire is sandwiched between a first feed roller and a second feed roller, and is fed out toward the reinforcing steel by rotation of the first feed roller. The first feed roller includes a groove through which the wire passes as it is fed out toward the reinforcing steel. The hardness of the first feed roller in the groove is 1000HV or more.

[0012] According to the above configuration, the hardness of the first feed roller in the groove is 1000 HV or more, so the first feed roller is unlikely to wear out even if it comes into contact with the wire in the groove. Even if the binding operation is repeatedly performed, it is possible to suppress the first feed roller from being worn out within the groove. [Brief explanation of the drawing]

[0013]

Figure 1

Figure 2

[0014] Below, typical 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 provide those skilled in the art with details for implementing the preferred embodiment of the invention, and is not intended to limit the scope of the invention. Additionally, the additional features and inventions disclosed below can be used separately or in conjunction with other features and inventions to provide further improved rebar tying machines, methods of making and using the same. .

[0015] Furthermore, the features and combinations of steps disclosed in the following detailed description are not essential to practicing the invention in its broadest sense, and are intended solely for the purpose of specifically illustrating representative embodiments of the invention. shall be described. Moreover, various features of the exemplary embodiments above and below, as well as those recited in the independent and dependent claims, are hereby described in providing additional and useful embodiments of the invention. They do not have to be combined exactly as shown in the specific examples given or in the order listed.

[0016] All features recited in the specification and / or claims, apart from constitution of the features in the examples and / or claims, are included as limitations on the original disclosure and specificity claimed. are intended to be disclosed individually and independently of each other. Furthermore, all references to numerical ranges and groups or populations are intended to disclose intermediate configurations thereof as limitations on the original disclosure and the specific claimed subject matter.

[0017] The reinforcing bar binding machine disclosed in this specification binds reinforcing bars using wire. The reinforcing bar tying machine includes a contact member that comes into contact with the wire during a tying operation in which the reinforcing bar tying machine binds the reinforcing bars using the wire. The contact member includes a base material and a surface layer that covers at least a portion of the surface of the base material and contacts the wire during a tying operation. The hardness of the surface layer is higher than that of the base material.

[0018] In one or more embodiments, the surface layer may be comprised of ceramics.

[0019] Common ceramics have high hardness compared to other materials. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to further suppress the contact member from being worn out.

[0020] In one or more embodiments, the ceramic may include tungsten carbide.

[0021] Generally, tungsten carbide has high hardness compared to other materials. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to further suppress the contact member from being worn out.

[0022] In one or more embodiments, the surface layer thickness may be 10 micrometers or more.

[0023] When the thickness of the surface layer is less than 10 micrometers, the force applied to the surface layer from the wire may cause damage to the surface layer. According to the above configuration, it is possible to suppress damage to the surface layer due to the force that the surface layer receives from the wire.

[0024] In one or more embodiments, the surface layer thickness may be 200 micrometers or less.

[0025] According to the above configuration, even if the binding operation is repeatedly performed, it is possible to suppress the surface layer from peeling off from the base material.

[0026] In one or more embodiments, the hardness of the surface layer may be greater than or equal to 900 HV.

[0027] Generally, the larger the diameter of the wire used, the more likely the contact member will wear. According to the above configuration, even when a large diameter wire is used, wear of the contact member can be further suppressed.

[0028] In one or more embodiments, the rebar tying machine may further include a feed motor and a feed roller that rotates as the feed motor rotates and feeds the wire toward the rebar. The contact member may constitute a feed roller.

[0029] Generally, the feed roller feeds the wire toward the reinforcing steel, so it is easily worn out. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to suppress the feed roller from being worn out.

[0030] In one or more embodiments, the rebar tying machine may further include a cutting blade that cuts the wire during the tying operation. The contact member may constitute a cutting blade.

[0031] Generally, the cutting blade is strongly pressed against the wire when cutting the wire, so it is easily worn out. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to suppress the cutting blade from being worn out.

[0032] The reinforcing bar binding machine disclosed in this specification binds reinforcing bars using wire. The rebar tying machine has a first contact member and a second contact member that contacts the first contact member and moves relative to the first contact member during a tying operation in which the rebar tying machine binds reinforcing bars using wire. A contact member. The first contact member includes a first base material and a first surface layer covering at least a portion of the surface of the first base material. The second contact member includes a second base material and a second surface layer that covers at least a portion of the surface of the second base material and contacts the first surface layer during a binding operation. The hardness of the first surface layer is higher than the hardness of the first base material. The hardness of the second surface layer is higher than the hardness of the second base material.

[0033] In one or more embodiments, each of the first surface layer and the second surface layer may be comprised of ceramics.

[0034] Common ceramics have high hardness compared to other materials. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to further suppress wear of the first contact member and the second contact member.

[0035] In one or more embodiments, the ceramic may include tungsten carbide.

[0036] Generally, tungsten carbide has high hardness compared to other materials. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to further suppress wear of the first contact member and the second contact member.

[0037] In one or more embodiments, each of the first surface layer thickness and the second surface layer thickness may be 10 micrometers or more.

[0038] According to the above configuration, when the thickness of the first surface layer and the thickness of the second surface layer are each less than 10 micrometers, the first surface layer and the second surface layer come into contact with each other during the binding operation. The second surface layer may be damaged. According to the above configuration, damage to the first surface layer and the second surface layer can be suppressed.

[0039] In one or more embodiments, the thickness of the first surface layer and the thickness of the second surface layer may each be 200 micrometers or less.

[0040] According to the above configuration, even if the binding operation is repeatedly performed, it is possible to suppress the first surface layer from peeling off from the first base material and the second surface layer from peeling from the second base material.

[0041] In one or more embodiments, the hardness of the first surface layer and the hardness of the second surface layer may each be 900 HV or more.

[0042] Generally, the larger the diameter of the wire used, the greater the force exerted between the first contact member and the second contact member. According to the above configuration, even when a large diameter wire is used, wear of the first contact member and the second contact member can be further suppressed.

[0043] In one or more embodiments, the rebar tying machine may further include a cutting unit that cuts the wire during the tying operation. The cutting unit may include a first contact member and a second contact member.

[0044] Since the cutting unit is strongly pressed against the wire when cutting the wire, a large force acts between the first contact member and the second contact member. Therefore, the first contact member and the second contact member of the cutting unit are generally prone to wear. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to suppress the first contact member and the second contact member from being worn out.

[0045] The reinforcing bar binding machine disclosed in this specification binds reinforcing bars using wire. The reinforcing bar binding machine includes a feed roller that feeds the wire toward the reinforcing bars when the reinforcing bar binding machine uses wire to bind the reinforcing bars. The hardness of the surface layer of the feed roller is 900HV or more. Note that HV represents Vickers hardness.

[0046] The reinforcing bar binding machine disclosed in this specification binds reinforcing bars using wire. The reinforcing bar binding machine includes a first feed roller that comes into contact with the wire when the wire is sent out toward the reinforcing bars and is rotated by a motor, and a second feed roller that comes into contact with the wire when the wire is sent out toward the reinforcing bars. It is equipped with The wire is sandwiched between the first feed roller and the second feed roller, and is fed out toward the reinforcing steel by rotation of the first feed roller. The first feed roller includes a groove through which the wire passes as it is fed out toward the reinforcing steel. The hardness of the first feed roller in the groove is 1000HV or more.

[0047] (Example) As shown in FIG. 1, the reinforcing bar binding machine 2 binds a plurality of reinforcing bars R using wires W. The reinforcing bar binding machine 2 uses wires 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 binding thin reinforcing bars R with a diameter of 16 mm or less (for example, 16 mm in diameter), a wire W with a diameter of 1.6 mm or less (for example, 0.8 mm) is used, and a wire W with a diameter larger than 16 mm (for example, When bundling large-diameter reinforcing bars R with a diameter of 25 mm or 32 mm, a wire W having a diameter of 1.6 mm or more (for example, 2.0 mm) is used. Hereinafter, the longitudinal direction of the torsion unit 38 (see FIG. 3) will be referred to as the front-rear direction, the direction orthogonal to the front-rear direction will be referred to as the up-down direction, and the direction orthogonal to the front-rear direction and the up-down direction will be referred to as the left-right direction.

[0048] The reinforcing bar binding machine 2 includes a main body 4, a reel holder 6, and a battery pack B. The main body 4 includes 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 is attached to the outside of the right main body 10. It is equipped with a motor cover 12. The left main body 8 and the right main body 10 are fixed by a plurality of screws S1. The right main body 10 and the motor cover 12 are fixed with a plurality of screws S2.

[0049] The main body 4 includes a main body housing 14, a grip 16, and a battery attachment part 18. The main body housing 14, the grip 16, and the battery mounting portion 18 are integrally formed. Grip 16 is held by the user. A trigger 20 is attached to the upper front surface of the grip 16. Battery pack B is removably attachable to battery mounting portion 18.

[0050] The reel holder 6 is attached to the front lower part of the main body housing 14. As shown in FIG. 2, the reel holder 6 can accommodate the reel 24. A 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 removed from the reel holder 6.

[0051] As shown in FIG. 3, the reinforcing bar binding machine 2 includes a control circuit board 30. The control circuit board 30 is housed in the battery mounting portion 18. When the trigger 20 is pushed in, the control circuit board 30 performs a binding operation of binding the wires W to the reinforcing bars R.

[0052] The reinforcing bar binding machine 2 includes a feeding unit 34, a cutting unit 36, and a twisting unit 38. The feeding unit 34 includes a feeding section 40 and a guide section 42. The feeding section 40 is housed in the front part of the main body housing 14. The guide portion 42 is arranged at 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.

[0053] As shown in FIG. 4, the feed section 40 includes a feed motor 50, a reduction section 52, a base member 54, a drive gear 56, a first feed gear 58, a second feed gear 60, and a release lever 62. , and a compression spring 64. The feed motor 50 is disposed on the right side of the right main body 10 (see FIG. 1), and is covered by the motor cover 12 (see FIG. 1). The feed motor 50 is operated by power supplied from the battery pack B (see FIG. 1). The feed motor 50 is, for example, a brushless motor. The feed motor 50 is controlled by a control circuit board 30 (see FIG. 3). The deceleration unit 52 decelerates the rotation of the feed motor 50 and transmits the deceleration to the drive gear 56.

[0054] The base member 54 is fixed to the main body housing 14 (see FIG. 1). The outer peripheral surface of the first feed gear 58 meshes with the outer peripheral 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 extending around the rotation axis on its outer peripheral surface. The first feed gear 58 contacts the wire W within the groove 58a. The second feed gear 60 is rotatably supported by a release lever 62. The second feed gear 60 has a groove 60a extending around the rotation axis on its outer peripheral surface. The second feed gear 60 contacts the wire W within the groove 60a.

[0055] The release lever 62 is swingably supported by the base member 54. Compression spring 64 biases release lever 62 in the direction in which second feed gear 60 approaches first feed gear 58. As a result, second feed gear 60 is pressed against first feed gear 58. As a result, the wire W is held 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 while the wire W is held between the groove 58a of the first feed gear 58 and the groove 60a of the second feed gear 60, the wire W moves.

[0056] As shown in FIG. 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 body housing 14.

[0057] As shown in FIG. 6, the upper curl guide 66 includes a first upper curl guide 70, a second upper curl guide 72, a third upper curl guide 74, and a front guide pin 76. The first upper curl guide 70 is fixed to the main body housing 14 (see FIG. 1). The lower surface 70a of the front portion of the first upper curl guide 70 has a curved shape that is upwardly convex in the front-rear direction. A first fixing hole 80 is formed near the front end of the first upper curl guide 70. The first fixing hole 80 passes through the first upper curl guide 70 in the thickness direction.

[0058] The second upper curl guide 72 is sandwiched between the front part of the first upper curl guide 70 and the third upper curl guide 74. The lower surface 72a of the second upper curl guide 72 has a curved shape that is upwardly convex in the front-rear direction. The lower surface 72a of the second upper curl guide 72 is arranged above the front lower surface 70a of the first upper curl guide 70. A second fixing hole 82 is formed near the front end of the second upper curl guide 72. The second fixing hole 82 passes through the second upper curl guide 72 in the thickness direction. The second fixing hole 82 is connected to the lower surface 72a of the second upper curl guide 72.

[0059] The third upper curl guide 74 is arranged on the left side of the second upper curl guide 72. The lower surface 74a of the third upper curl guide 74 has a curved shape that is upwardly convex in the front-rear direction. The vertical position of the lower surface 74a of the third upper curl guide 74 is approximately the same as the vertical position of the front lower surface 70a of the first upper curl guide 70. The right surface 74b of the third upper curl guide 74 faces the left surface 70b of the first upper curl guide 70. A third fixing hole 84 is formed near the front end of the third upper curl guide 74. The third fixing hole 84 passes through the third upper curl guide 74 in the thickness direction.

[0060] The first fixing hole 80, the second fixing hole 82, and the third fixing hole 84 are lined up in a row in the left-right direction. The front guide pin 76 is inserted into a first fixing hole 80, a second fixing hole 82, and a third fixing hole 84.

[0061] As shown in FIG. 5, the upper curl guide 66 has an upper wire passageway 86. The upper wire passage 86 is defined by the left surface 70b of the first upper curl guide 70, the lower surface 72a of the second upper curl guide 72, and the right surface 74b of the third upper curl guide 74 (see FIG. 6). A portion of the front guide pin 76 is located in the upper wire passageway 86.

[0062] The lower curl guide 68 is arranged below the upper curl guide 66. The lower curl guide 68 is open upward. Lower curl guide 68 has a lower wire passageway 88.

[0063] When the feed motor 50 (see FIG. 4) rotates in the first direction D1 (see FIG. 4), the first feed gear 58 and the second feed gear 60 rotate to send the wire W to the upper wire passage 86. The wire W sent to the upper wire passage 86 passes through the upper wire passage 86 from the rear side to the front side while contacting the lower surface 72a of the second upper curl guide 72. Furthermore, when the wire W passes through the upper wire passage 86, it also comes into contact with the front guide pin 76. As a result, the wire W is given a downward curl. The wire W passing through the upper wire passage 86 is sent to the lower wire passage 88. The wire W sent to the lower wire passage 88 passes through the lower wire passage 88 from the front side toward the rear side, and is then sent toward the rear upper side. Thereby, the wire W is wound around the reinforcing bar R. When the feed motor 50 rotates in the second direction D2 (see FIG. 4) opposite to the first direction D1 while the vicinity of the tip of the wire W is held by the holding unit 124 (see FIG. 9) described later, the first feed The gear 58 and the second feed gear 60 rotate to pull the wire W back toward the reel 24 (see FIG. 3). As a result, the wire W around the reinforcing bar R is reduced in diameter and comes into contact with the reinforcing bar R.

[0064] As shown in FIG. 7, the cutting unit 36 ​​includes a base member 92, a guide member 93, a first cutting blade 94, a second cutting blade 96, a first lever member 98, a second lever member 100, It includes a first shaft 102, a second shaft 104, a link member 106, a torsion spring 108, a connecting pin 114, and a fixing pin 115.

[0065] The base member 92 is fixed to the main body housing 14 (see FIG. 3) with a plurality of screws S3 (see FIG. 3). The front end of the base member 92 is fixed to the lower curl guide 68 with a screw S4 and a pin P1 (see FIG. 8).

[0066] As shown in FIG. 5, the guide member 93 is arranged on the left side of the base member 92 near the front end of the base member 92. As shown in FIG. The base member 92 and the guide member 93 are fixed with screws S5. The guide member 93 has a guide hole 93a. The width of the guide hole 93a gradually becomes narrower from the bottom to the top, and then remains constant. The wire W sent by the first feed gear 58 and the second feed gear 60 (see FIG. 4) passes through the guide hole 93a.

[0067] The first cutting blade 94, the second cutting blade 96, and the guide hole 93a are arranged on a path along which the wire W is sent from the feeding section 40 toward the upper curl guide 66. The first cutting blade 94 is fixed near the front end of the base member 92. The first cutting blade 94 is immovable with respect to the main body housing 14 (see FIG. 3). The first cutting blade 94 has a first cutting opening 110. The first cutting blade 94 is inserted into the second cutting blade 96. The second cutting blade 96 is supported by the first cutting blade 94 so as to be rotatable around the first cutting blade 94. The second cutting blade 96 is rotatable relative to the main body housing 14 (see FIG. 3). The second cutting blade 96 has a second cutting opening 112. Before the cutting unit 36 ​​cuts the wire W, the first cutting opening 110 and the second cutting opening 112 are in communication. When the wire W is sent from the sending section 40 toward the upper curl guide 66, it is guided by the guide hole 93a and passes through the first cutting opening 110 and the second cutting opening 112. When the second cutting blade 96 rotates around the first cutting blade 94 in the third direction D3 with the wire W passing through the first cutting opening 110 and the second cutting opening 112, the first cutting blade 94 and the second cutting blade 96 rotate in the third direction D3. The two cutting blades 96 contact the wire W and cut the wire W.

[0068] As shown in FIG. 7, the first lever member 98 and the second lever member 100 are fixed by a first shaft 102 and a second shaft 104. The first shaft 102 and the second shaft 104 are inserted into the first lever member 98 and the second lever member 100. The first shaft 102 is fixed to the base member 92, and the first lever member 98 and the second lever member 100 rotate around the first shaft 102. The second shaft 104 is inserted into the lower end of the first lever member 98 and the lower end of the second lever member 100. When the first lever member 98 and the second lever member 100 rotate around the first shaft 102, the second shaft 104 moves together with the first lever member 98 and the second lever member 100. The first lever member 98 includes a first protrusion 98a that is operated by the torsion unit 38. The second lever member 100 includes a second protrusion 100a that is operated by the torsion unit 38.

[0069] The rear end of the link member 106 is fixed to the second shaft 104. Link member 106 is rotatable around second shaft 104. The front end of the link member 106 is fixed to the second cutting blade 96 via a connecting pin 114.

[0070] A torsion spring 108 is attached to the first shaft 102. One end of the torsion spring 108 is in contact with the second shaft 104. A fixing pin 115 is fixed to the base member 92, and the other end of the torsion spring 108 is in contact with the fixing pin 115. The torsion spring 108 biases the second shaft 104 toward the front.

[0071] As shown in FIG. 7, before the cutting unit 36 ​​cuts the wire W, the second shaft 104 is located in front of the first shaft 102. When the second protrusion 100a is operated toward the front, the second shaft 104 moves toward the rear as shown in FIG. 8, and the link member 106 moves toward the rear as the second shaft 104 moves. move towards the side. As a result, the second cutting blade 96 rotates in the third direction D3 (see FIG. 7), and the wire W is cut.

[0072] As shown in FIG. 9, the torsion unit 38 includes a torsion motor 116, a deceleration section 118, and a holding section 120. The torsion motor 116 and the speed reducer 118 are supported by the main body housing 14 (see FIG. 3). The torsion motor 116 is operated by power supplied from the battery pack B (see FIG. 3). The torsion motor 116 is, for example, a brushless motor. The torsion motor 116 is controlled by a control circuit board 30 (see FIG. 3). The deceleration section 118 decelerates the rotation of the torsion motor 116 and transmits it to the holding section 120.

[0073] The holding section 120 includes a sleeve unit 122 and a holding unit 124. The sleeve unit 122 includes a screw shaft 126 (see FIG. 10), a ball 128 (see FIG. 10), a sleeve 130, and a push plate 132.

[0074] The screw shaft 126 shown in FIG. 10 rotates as the torsion motor 116 (see FIG. 9) rotates. Screw shaft 126 is inserted into sleeve 130 (see FIG. 9). A ball groove 134 is formed on the outer peripheral surface of the screw shaft 126. The ball groove 134 extends spirally in the front-rear direction. The ball 128 is held in the ball groove 134 so as to be movable within the ball groove 134. A ball holding hole (not shown) is formed in the inner surface of the sleeve 130 (see FIG. 9), and the ball 128 is rotatably held in the ball holding hole.

[0075] As shown in FIG. 9, push plate 132 is fixed to sleeve 130. Push plate 132 is located near the rear end of sleeve 130.

[0076] The holding unit 124 is inserted into the sleeve 130 from the front side of the sleeve 130. The holding unit 124 includes a shaft member 136, a left holding member 138, and a right holding member 140. When the reinforcing bar tying machine 2 is in the initial state before tying the reinforcing bars R, a left wire passage 142 is formed between the shaft member 136 and the left holding member 138, and a left wire passage 142 is formed between the shaft member 136 and the right holding member 140. A right wire passage 144 is formed between the two. The wire W can pass through the left wire passage 142 and the right wire passage 144.

[0077] The operations of the cutting unit 36 ​​and the twisting unit 38 will be explained. When the torsion motor 116 rotates in the fourth direction D4, the screw shaft 126 (see FIG. 10) rotates, and the ball 128 (see FIG. 10) moves within the ball groove 134 (see FIG. 10). Sleeve 130 advances relative to screw shaft 126 and right holding member 140 moves to the left relative to shaft member 136. As a result, the right wire passage 144 is narrowed, and the wire W is held between the shaft member 136 and the right holding member 140 at a first position near the tip of the wire W. After the diameter of the wire W wound around the reinforcing bar R is reduced, when the torsion motor 116 further rotates in the fourth direction D4, the sleeve 130 further moves forward with respect to the screw shaft 126, and the left holding member 138 moves against the shaft member. Move to the right for 136. As a result, the left wire passage 142 is narrowed, and the wire W is held between the shaft member 136 and the left holding member 138 at a second position closer to the reel 24 (see FIG. 3) than the first position. As shown in FIG. 8, when the torsion motor 116 further rotates in the fourth direction D4, the sleeve 130 further advances relative to the screw shaft 126, and the push plate 132 Push it out toward the front. As the second shaft 104 moves toward the rear, the link member 106 moves toward the rear. As a result, the second cutting blade 96 rotates in the third direction D3 (see FIG. 7), and the wire W is cut. When the torsion motor 116 further rotates in the fourth direction D4 shown in FIG. 9 and the ball 128 moves to the front end of the ball groove 134, the sleeve 130 rotates together with the screw shaft 126. This causes the wire W to be twisted. After the wire W is twisted, when the torsion motor 116 rotates in the fifth direction D5 opposite to the fourth direction D4, the sleeve 130 moves back relative to the screw shaft 126 and rotates together with the screw shaft 126. When the sleeve 130 retreats with respect to the screw shaft 126, the push plate 132 pushes the first protrusion 98a of the first lever member 98 toward the rear side. As shown in FIG. 7, the cutting unit 36 ​​returns to the initial position by moving the second shaft 104 toward the front.

[0078] When the reinforcing bar tying machine 2 shown in Fig. 1 executes the tying operation of tying the reinforcing bars R using the wire W, various members come into contact with the wire W, and while two members are in contact with each other, one member is move relative to the other member. The parts that come into contact with the wire W and the two parts that come into contact with each other are made of high hardness so that the parts that come into contact with the wire W and the two parts that come into contact with each other do not wear out even if the binding operation is repeated. There is.

[0079] The members that come into contact with the wire W include, for example, the first feed gear 58 (see FIG. 4), the second feed gear 60 (see FIG. 4), the first upper curl guide 70 (see FIG. 6), and the second upper curl guide 70 (see FIG. 6). Curl guide 72 (see Figure 6), third upper curl guide 74 (see Figure 6), front guide pin 76 (see Figure 6), first cutting blade 94 (see Figure 5), and second cutting blade. 96 (see FIG. 5), a shaft member 136 (see FIG. 9), a left holding member 138 (see FIG. 9), and a right holding member 140 (see FIG. 9). Hereinafter, the member that contacts the wire W described above will be simply referred to as a contact member 150.

[0080] The two members that come into contact with each other are, for example, the first feed gear 58 (see FIG. 4) and the second feed gear 60 (see FIG. 4), and the first cutting blade 94 (see FIG. 5) and the second cutting blade 96. (see Fig. 5), a first lever member 98 (see Fig. 7), a first shaft 102 (see Fig. 7), a second lever member 100 (see Fig. 7), and a first shaft 102 (see Fig. 7). ), the second shaft 104 (see Figure 7), the link member 106 (see Figure 7), the link member 106 (see Figure 7), the connecting pin 114 (see Figure 7), and the connecting pin 114 (see Figure 7). 7) and the second cutting blade 96 (see Fig. 7), the first protrusion 98a (see Fig. 7), the push plate 132 (see Fig. 7), and the second protrusion 100a (see Fig. 7). These are the push plate 132 (see FIG. 7), the ball 128 (see FIG. 10), and the ball groove 134 (see FIG. 10). In particular, the pair of first feed gear 58 and second feed gear 60, the pair of first cutting blade 94 and second cutting blade 96, the pair of first lever member 98 and first shaft 102, and the pair of second lever member 100 and second cutting blade 96, In the pair of the first shaft 102, the pair of the second protrusion 100a and the push plate 132, and the pair of the ball 128 and the ball groove 134, a relatively large force acts on the contact points between the two members. Hereinafter, the two members that contact each other will simply be referred to as a first contact member 152 and a second contact member 154.

[0081] As shown in FIG. 11, the contact member 150 includes a base material 160 and a surface layer 162. Note that in FIG. 11, the base material 160 and the surface layer 162 are illustrated in an exaggerated manner in order to make it easier to understand the structure of the base material 160 and the surface layer 162. The base material 160 may be made of metal material, ceramics, or resin material. The base material 160 may be a steel base material made of molten steel, a steel base material manufactured by precision casting, or a steel base material manufactured by powder metallurgy. Steel base materials made from melted steel include, for example, alloy tool steels (SKS, SKD, SKT, SKH), high-speed tool steels (SKH), chromium steel (SCR), chromium-molybdenum steel (SCM), and nickel. It may be chromium steel (SNC) or nickel chromium molybdenum steel (SNC). A steel base material manufactured by precision casting may be manufactured by, for example, a lost wax method. A steel base material manufactured by powder metallurgy may be manufactured by MIM, for example, using high speed tool steel (high speed steel) powder (powdered high speed steel) as a raw material. Further, the steel base material manufactured by powder metallurgy may be high speed tool steel (SKH) or alloy tool steel (SKD). The hardness of the base material 160 is, for example, 400HV or more, for example, 500HV or more, for example, 600HV or more, for example, 700HV or more, for example, 800HV or more. Note that HV represents Vickers hardness. With such a configuration, it is possible to suppress damage to the base material 160 even if the binding operation is repeatedly performed. Further, the hardness of the base material 160 is, for example, 1000 HV or less, for example, 900 HV or less, for example, 800 HV or less. With such a configuration, it is possible to prevent the base material 160 from becoming difficult to manufacture (process).

[0082] Surface layer 162 constitutes at least a portion of the outer surface of contact member 150, for example, all of the outer surface of contact member 150. The surface layer 162 covers at least a portion of the surface of the base material 160, for example, the entire surface of the base material 160. When the surface layer 162 covers only a portion of the surface of the base material 160, the surface layer 162 is arranged in a region that comes into contact with the wire W during the binding operation. The area in contact with the wire W is, for example, the groove 58a of the first feed gear 58, the groove 60a of the second feed gear 60, and the left surface 70b of the first upper curl guide 70 of the first upper curl guide 70. , for the second upper curl guide 72, it is the lower surface 72a of the second upper curl guide 72, for the third upper curl guide 74, it is the right surface 74b of the third upper curl guide 74, and for the front guide pin 76, it is the side surface of the front guide pin 76. , the first cutting opening 110 for the first cutting blade 94, the second cutting opening 112 for the second cutting blade 96, the side surface of the shaft member 136 for the shaft member 136, and the wire W for the left holding member 138. In the right side holding member 140, it is the front part that holds the wire W.

[0083] As an example, the surface layer 162 of the first feed gear 58 will be described with reference to FIGS. 12 and 13. In the first feed gear 58, the surface layer 162 is formed into a V-shaped groove 58a. That is, the groove 58a is filled with a highly hard material. In the first feed gear 58, the surface layer 162 is not formed on a portion other than the groove 58a, for example, on the outer peripheral surface and side surfaces other than the groove 58a, and the base material 160 is exposed. In the first feed gear 58, the surface layer 162 is formed only at the location where it contacts the wire W, and the expensive build-up process (formation of the surface layer 162) is effectively performed.

[0084] The surface layer 162 shown in FIG. 11 is made of a highly hard material. The surface layer 162 may be made of a metal material or ceramics. The surface layer 162 is preferably made of ceramics from the viewpoint of high hardness, low thermal expansion, and wear resistance. The surface layer 162 is made of a cemented carbide, for example, a material whose main component is tungsten carbide, and the material may contain a small amount of a material other than tungsten carbide. The weight content of tungsten carbide in the material is, for example, 80% or more, such as 90% or more, such as 95% or more, such as 96% or more, such as 97% or more, such as 98% or more, such as 99% or more, such as 100%. It is. The surface layer 162 is made of, for example, high speed steel or powdered high speed steel.

[0085] The hardness of the surface layer 162 is higher than that of the base material 160. The hardness of the surface layer 162 is, for example, 800 HV or more, for example 900 HV or more, for example 1000 HV or more, for example 1100 HV or more, for example 1200 HV or more. With such a configuration, it is possible to suppress the surface layer 162 from being worn out even if the binding operation is repeatedly performed. When a wire W having a large diameter of 1.6 mm or more is used, the hardness of the surface layer 162 is preferably 900 HV or more. With such a configuration, even when a wire W having a large diameter of 1.6 mm or more is used, it is possible to suppress the surface layer 162 from being worn out. In order to further suppress wear of the surface layer 162, the hardness of the surface layer 162 is more preferably 1000 HV or more.

[0086] The thickness L1 of the surface layer 162 is, for example, 10 micrometers or more, such as 15 micrometers or more, such as 20 micrometers or more, such as 30 micrometers or more, for example, 50 micrometers or more. With such a configuration, it is possible to suppress the surface layer 162 from being worn out even if the binding operation is repeatedly performed. When a large wire W having a diameter of 1.6 mm or more is used, the thickness L1 of the surface layer 162 is preferably 30 micrometers or more. With such a configuration, even when a wire W having a large diameter of 1.6 mm or more is used, it is possible to suppress the surface layer 162 from being worn out. Furthermore, it is more preferable that the thickness L1 of the surface layer 162 is 50 micrometers or more.

[0087] The thickness L1 of the surface layer 162 is, for example, 400 micrometers or less, such as 300 micrometers or less, such as 200 micrometers or less, such as 100 micrometers or less, such as 80 micrometers or less, such as 60 micrometers or less. With such a configuration, peeling of the surface layer 162 from the base material 160 can be suppressed. When a large wire W having a diameter of 1.6 mm or more is used, the thickness L1 of the surface layer 162 is preferably 200 micrometers or less. With this configuration, even when a wire W having a diameter of 1.6 mm or more is used, the surface layer 162 will peel off from the base material 160 as the binding operation is repeated. can be suppressed. Furthermore, in order to further suppress peeling between the base material 160 and the surface layer 162, the thickness L1 of the surface layer 162 is more preferably 100 micrometers or less.

[0088] The surface layer 162 is formed on the surface of the base material 160 by, for example, thermal spraying. Specifically, a coating material (for example, a powdered coating material) that is a raw material for the surface layer 162 is heated, and the molten coating material is sprayed onto the surface of the base material 160. As the molten coating material solidifies on the surface of the substrate 160, a surface layer 162 is formed on the surface of the substrate 160. As a result, the base material 160 is in a built-up state. When the base material 160 is made of a metal material or ceramics, even if a molten coating material is sprayed onto the surface of the base material 160, the surface of the base material 160 can be prevented from melting. Furthermore, if the surface of the base material 160 is roughened in advance, peeling of the surface layer 162 from the base material 160 due to the melted coating material entering the recesses on the surface of the base material 160 can be further suppressed. Can be done.

[0089] The surface layer 162 may be formed on the surface of the base material 160 by various methods other than thermal spraying, such as laser cladding or PTA. In laser cladding and PTA, the coating material (for example, the material of the coating material), which is the raw material for the surface layer 162, is sprayed onto the surface of the base material 160, while the coating material and the surface of the base material 160 are melted by heating. When the coating and the surface of the substrate 160 solidify, a surface layer 162 is formed on the surface of the substrate 160. As a result, the base material 160 is in a built-up state.

[0090] As shown in FIG. 14, each of the first contact member 152 and the second contact member 154 includes a base material 170 and a surface layer 172. The material and hardness characteristics of the base material 170 are similar to those of the base material 160.

[0091] The surface layer 172 constitutes at least a portion of each of the outer surfaces of the first contact member 152 and the second contact member 154, for example, all of the outer surfaces of the first contact member 152 and the second contact member 154, respectively. The surface layer 172 covers at least a portion of the surface of the base material 170, for example, the entire surface of the base material 170. When the surface layer 172 covers only a portion of the surface of the base material 170, the surface layer 172 covers the area where the first contact member 152 and the second contact member 154 contact each other (first contact member 152 or second contact member 154). upper area). For example, in a pair of the first feed gear 58 and the second feed gear 60, the area where the first contact member 152 and the second contact member 154 come into contact with each other is where the first feed gear 58 and the second feed gear 60 mesh with each other. The outer peripheral surface of the first feed gear 58 and the outer peripheral surface of the second feed gear 60, and in the pair of the first cutting blade 94 and the second cutting blade 96, the outer peripheral surface of the first cutting blade 94 and the inner peripheral surface of the second cutting blade In the pair of the first lever member 98 and the first shaft 102, the inner circumferential surface of the first lever member 98 and the outer circumferential surface of the first shaft 102, and the outer circumferential surface of the second lever member 100 and the first shaft 102. In the pair, the inner circumferential surface of the second lever member 100 and the outer circumferential surface of the first shaft 102, and in the pair of the second shaft 104 and link member 106, the outer circumferential surface of the second shaft 104 and the inner circumferential surface of the link member 106. In the pair of the link member 106 and the connecting pin 114, the inner circumferential surface of the link member 106 and the outer circumferential surface of the connecting pin 114, and in the pair of the connecting pin 114 and the second cutting blade 96, the outer circumferential surface of the connecting pin 114. and the inner peripheral surface of the second cutting blade 96, and in the case of the pair of the first protrusion 98a and the push plate 132, the surface of the first protrusion 98a and the rear surface of the push plate 132, and the second protrusion 100a and the push plate For the pair No. 132, it is the surface of the second protrusion 100a and the front surface of the push plate 132, and for the pair of ball 128 and ball groove 134, it is the surface of the ball 128 and the surface of the ball groove 134.

[0092] The characteristics of the material of the surface layer 172 are similar to the characteristics of the material of the surface layer 162. The hardness of the surface layer 172 is higher than that of the base material 170. The hardness of the surface layer 172 is, for example, 800 HV or more, for example 900 HV or more, for example 1000 HV or more, for example 1100 HV or more, for example 1200 HV or more. With such a configuration, even if the surface layer 172 of the first contact member 152 moves in the sixth direction D6 with respect to the surface layer 172 of the second contact member 154, wear of each surface layer 172 is suppressed. be able to. When the first contact member 152 and the second contact member 154 are configured such that a relatively large force is applied to each surface layer 172, the hardness of the surface layer 172 is preferably 900 HV or more. With such a configuration, even when a relatively large force is applied to the surface layer 172, it is possible to suppress the surface layer 172 from being worn out. In order to further suppress wear of the surface layer 172, it is more preferable that the hardness of the surface layer 172 is 1000 HV or more.

[0093] The thickness L2 of the surface layer 172 of the first contact member 152 and the thickness L3 of the surface layer 172 of the second contact member 154 may be different or may be the same. The thicknesses L2 and L3 of the surface layer 172 are, for example, 10 micrometers or more, such as 15 micrometers or more, such as 20 micrometers or more, such as 30 micrometers or more, such as 50 micrometers or more. With such a configuration, it is possible to suppress the surface layer 172 from being worn out even if the binding operation is repeatedly performed. When the first contact member 152 and the second contact member 154 are configured such that a relatively large force acts on their respective surface layers 172, the thicknesses L2 and L3 of the surface layers 172 may be 30 micrometers or more. preferable. With such a configuration, even when a relatively large force is applied to the surface layer 172, it is possible to suppress the surface layer 172 from being worn out. Furthermore, it is more preferable that the thicknesses L2 and L3 of the surface layer 172 are 50 micrometers or more.

[0094] The thicknesses L2 and L3 of the surface layer 172 are, for example, 400 micrometers or less, such as 300 micrometers or less, such as 200 micrometers or less, such as 100 micrometers or less, such as 80 micrometers or less, such as 60 micrometers or less. With such a configuration, peeling of the surface layer 172 from the base material 170 can be suppressed. When the first contact member 152 and the second contact member 154 are configured such that a relatively large force acts on their respective surface layers 172, the thicknesses L2 and L3 of the surface layers 172 may be 200 micrometers or less. preferable. With such a configuration, even if a relatively large force is applied to the surface layer 172, peeling of the surface layer 172 from the base material 170 can be suppressed. In order to further suppress peeling between the base material 170 and the surface layer 172, the thicknesses L2 and L3 of the surface layer 172 are more preferably 100 micrometers or less.

[0095] The surface layer 172 is formed on the surface of the base material 170 by, for example, thermal spraying. Furthermore, the method for forming the surface layer 172 on the surface of the base material 170 may be various methods other than thermal spraying, such as laser cladding or PTA.

[0096] In a modification, contact member 150, first contact member 152, and second contact member 154 are each made of one material. In each of the contact member 150, the first contact member 152, and the second contact member 154, the base material and the surface layer are made of the same material (same material). Contact member 150, first contact member 152, and second contact member 154 are made of high hardness material. Contact member 150, first contact member 152, and second contact member 154 may be made of metal material or ceramics. Contact member 150, first contact member 152, and second contact member 154 are preferably made of ceramics from the viewpoint of high hardness, low thermal expansion, and wear resistance. Contact member 150, first contact member 152, and second contact member 154 are made of cemented carbide, for example, a material whose main component is tungsten carbide, and the material may contain a small amount of a material other than tungsten carbide. The weight content of tungsten carbide in the material is, for example, 80% or more, such as 90% or more, such as 95% or more, such as 96% or more, such as 97% or more, such as 98% or more, such as 99% or more, such as 100%. It is. The contact member 150, the first contact member 152, and the second contact member 154 are made of, for example, high speed steel or powdered high speed steel.

[0097] The hardness (for example, the hardness of the surface layer) of the contact member 150, the first contact member 152, and the second contact member 154 is, for example, 800 HV or more, for example, 900 HV or more, for example, 1000 HV or more, for example, 1100 HV or more, for example, 1200 HV or more. With such a configuration, it is possible to suppress the contact member 150, the first contact member 152, and the second contact member 154 from being worn out even if the binding operation is repeatedly performed. The hardness (for example, the hardness of the surface layer) of the contact member 150, the first contact member 152, and the second contact member 154 is preferably 900 HV or more. With this configuration, when a large diameter wire W with a diameter of 1.6 mm or more is used, or when a relatively large force is applied to the first contact member 152 and the second contact member 154, Even in this case, it is possible to suppress the contact member 150, the first contact member 152, and the second contact member 154 from being worn out. Furthermore, in order to further suppress wear, it is more preferable that the hardness (for example, the hardness of the surface layer) of contact member 150, first contact member 152, and second contact member 154 is 1000 HV or more.

[0098] As an example, the first feed gear 58 and the second feed gear 60 will be explained with reference to FIG. 15. The first feed gear 58 and the second feed gear 60 may be manufactured using one material, for example, powdered HSS. That is, the base material and the surface layer of the first feed gear 58 (second feed gear 60) are made of the same material (same material). In this case, the hardness of the surface layer of the first feed gear 58 (second feed gear 60), for example, the hardness at the grooves 58a (grooves 60a), is preferably 1000 HV or more. Thereby, it is possible to suppress wear of the first feed gear 58 (second feed gear 60). In order to further suppress wear, the hardness of the surface layer of the first feed gear 58 (second feed gear 60), for example, the hardness of the groove 58a (groove 60a), is preferably 1100 HV or more, and preferably 1200 HV or more. It is more preferable.

[0099] (effect) The reinforcing bar binding machine 2 of this embodiment binds reinforcing bars R using wires W. The reinforcing bar tying machine 2 includes a contact member 150 that comes into contact with the wire W during a tying operation in which the reinforcing bar tying machine 2 binds the reinforcing bars R using the wire W. The contact member 150 includes a base material 160 and a surface layer 162 that covers at least a portion of the surface of the base material 160 and comes into contact with the wire W during the binding operation. The hardness of the surface layer 162 is higher than that of the base material 160.

[0100] According to the above configuration, since the hardness of the surface layer 162 is higher than the hardness of the base material 160, the surface layer 162 of the contact member 150 is in contact with the wire W, compared to the case where the contact member 150 is made of only the base material 160. It is hard to wear even if it is used. Even if the binding operation is repeatedly performed, contact member 150 can be prevented from being worn out.

[0101] Further, the surface layer 162 is made of ceramics.

[0102] Common ceramics have high hardness compared to other materials. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to further suppress the contact member 150 from being worn out.

[0103] Further, the ceramics include tungsten carbide.

[0104] Generally, tungsten carbide has high hardness compared to other materials. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to further suppress the contact member 150 from being worn out.

[0105] Further, the thickness L1 of the surface layer 162 is 10 micrometers or more.

[0106] When the thickness L1 of the surface layer 162 is less than 10 micrometers, the force that the surface layer 162 receives from the wire W may damage the surface layer 162. According to the above configuration, damage to the surface layer 162 due to the force that the surface layer 162 receives from the wire W can be suppressed.

[0107] Further, the thickness L1 of the surface layer 162 is 200 micrometers or less.

[0108] According to the above configuration, even if the binding operation is repeatedly performed, peeling of the surface layer 162 from the base material 160 can be suppressed.

[0109] Further, the hardness of the surface layer 162 is 900HV or more.

[0110] Generally, the larger the diameter of the wire W used, the more likely the contact member 150 will wear out. According to the above configuration, even when a wire W having a large diameter is used, wear of the contact member 150 can be further suppressed.

[0111] The reinforcing bar binding machine 2 also includes a feed motor 50, and a first feed gear 58 or a second feed gear 60 (an example of a feed roller) that rotates as the feed motor 50 rotates and sends out the wire W toward the reinforcing steel R. , further includes. Contact member 150 constitutes first feed gear 58 or second feed gear 60.

[0112] Generally, the first feed gear 58 and the second feed gear 60 feed the wire W toward the reinforcing bar R, and therefore are likely to wear out. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to suppress the first feed gear 58 or the second feed gear 60 from being worn out.

[0113] Further, the reinforcing bar binding machine 2 further includes a first cutting blade 94 or a second cutting blade 96 (an example of a cutting blade) that cuts the wire W during the binding operation. Contact member 150 constitutes first cutting blade 94 or second cutting blade 96.

[0114] Generally, the first cutting blade 94 and the second cutting blade 96 are strongly pressed against the wire W when cutting the wire W, so they are easily worn out. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to suppress the first cutting blade 94 or the second cutting blade 96 from being worn out.

[0115] The reinforcing bar binding machine 2 of this embodiment binds reinforcing bars R using wires W. The reinforcing bar tying machine 2 contacts the first contact member 152 during the tying operation in which the reinforcing bar tying machine 2 binds the reinforcing bars R using the wire W, and A second contact member 154 that moves relatively. The first contact member 152 includes a base material 170 (an example of a first base material) and a surface layer 172 (an example of a first surface layer) that covers at least a portion of the surface of the base material 170. The second contact member 154 covers the base material 170 (an example of the second base material) and at least a portion of the surface of the base material 170, and the surface layer 172 contacts the surface layer 172 of the first contact member 152 during the binding operation. (an example of the second surface layer). The hardness of the surface layer 172 of the first contact member 152 is higher than the hardness of the base material 170 of the first contact member 152. The hardness of the surface layer 172 of the second contact member 154 is higher than the hardness of the base material 170 of the second contact member 154.

[0116] According to the above configuration, the hardness of the surface layer 172 of the first contact member 152 is higher than the hardness of the base material 170 of the first contact member 152, and the hardness of the surface layer 172 of the second contact member 154 is higher than that of the base material 170 of the second contact member 154. Since the hardness is higher than that of the base material 170, the surface layer 172 of the first contact member 152 and The surface layer 172 of the second contact member 154 is hard to wear even if they contact each other. Even if the binding operation is repeatedly performed, wear of the first contact member 152 and the second contact member 154 can be suppressed.

[0117] Further, each of the surface layer 172 of the first contact member 152 and the surface layer 172 of the second contact member 154 is made of ceramics.

[0118] Common ceramics have high hardness compared to other materials. According to the above configuration, even if the binding operation is repeatedly performed, wear of the first contact member 152 and the second contact member 154 can be further suppressed.

[0119] Further, the ceramics include tungsten carbide.

[0120] Generally, tungsten carbide has high hardness compared to other materials. According to the above configuration, even if the binding operation is repeatedly performed, wear of the first contact member 152 and the second contact member 154 can be further suppressed.

[0121] Further, each of the thickness L2 of the surface layer 172 of the first contact member 152 and the thickness L3 of the surface layer 172 of the second contact member 154 is 10 micrometers or more.

[0122] According to the above configuration, when the thickness L2 of the surface layer 172 of the first contact member 152 and the thickness L3 of the surface layer 172 of the second contact member 154 are each less than 10 micrometers, the surface layer 172 of the first contact member 152 When the surface layer 172 of the second contact member 154 contacts during the binding operation, the surface layer 172 of the first contact member 152 and the surface layer 172 of the second contact member 154 may be damaged. According to the above configuration, damage to the surface layer 172 of the first contact member 152 and the surface layer 172 of the second contact member 154 can be suppressed.

[0123] Further, each of the thickness L2 of the surface layer 172 of the first contact member 152 and the thickness L3 of the surface layer 172 of the second contact member 154 is 200 micrometers or less.

[0124] According to the above configuration, even if the binding operation is repeatedly performed, the surface layer 172 of the first contact member 152 peels off from the base material 170 of the first contact member 152, and the surface layer 172 of the second contact member 154 peels off from the base material 170 of the second contact member 152. Peeling of the member 154 from the base material 170 can be suppressed.

[0125] Furthermore, the hardness of the surface layer 172 of the first contact member 152 and the hardness of the surface layer 172 of the second contact member 154 are each 900 HV or more.

[0126] Generally, the larger the diameter of the wire W used, the greater the force acting between the first contact member 152 and the second contact member 154. According to the above configuration, even when a large diameter wire W is used, wear of the first contact member 152 and the second contact member 154 can be further suppressed.

[0127] Further, the reinforcing bar binding machine 2 further includes a cutting unit 36 ​​that cuts the wire W during the binding operation. The cutting unit 36 ​​includes a first cutting blade 94 (an example of a first contact member) and a second cutting blade 96 (an example of a second contact member).

[0128] Since the cutting unit 36 ​​is strongly pressed against the wire W when cutting the wire W, a large force acts between the first cutting blade 94 and the second cutting blade 96. Therefore, the first cutting blade 94 and the second cutting blade 96 of the cutting unit 36 ​​are generally prone to wear. According to the above configuration, even if the binding operation is repeatedly performed, it is possible to suppress the first cutting blade 94 and the second cutting blade 96 from being worn out.

[0129] The reinforcing bar binding machine 2 of this embodiment binds reinforcing bars R using wires W. The reinforcing bar binding machine 2 uses a first feed gear 58 or a second feeding gear 60 (an example of a feeding roller) that feeds the wire W toward the reinforcing bar R when the reinforcing bar binding machine 2 binds the reinforcing bars R using the wire W. It is equipped with The hardness of the surface layer 162 of the first feed gear 58 or the second feed gear 60 is 900 HV or more.

[0130] The first feed gear 58 and the second feed gear 60 come into contact with the wire W when feeding the wire W toward the reinforcing bar R. According to the above configuration, since the hardness of the surface layer 162 of the first feed gear 58 or the second feed gear 60 is 900 HV or more, the surface layer 162 of the first feed gear 58 or the second feed gear 60 comes into contact with the wire W. It is hard to wear even if it is used. Even if the binding operation is repeatedly performed, wear of the first feed gear 58 or the second feed gear 60 can be suppressed.

[0131] The reinforcing bar binding machine 2 of this specification binds reinforcing bars R using wires W. The reinforcing bar binding machine 2 includes a first feed gear 58 (an example of a first sending roller) that comes into contact with the wire W when the wire W is sent out toward the reinforcing bars R and is rotated by a feed motor 50 (an example of a motor); It includes a second feed gear 60 (an example of a second feed roller) that comes into contact with the wire W when the wire W is sent out toward the reinforcing bar R. The wire W is sandwiched between the first feed gear 58 and the second feed gear 60, and is sent out toward the reinforcing bar R by the rotation of the first feed gear 58. The first feed gear 58 includes a groove 58a through which the wire W passes when the wire W is sent out toward the reinforcing bar R. The hardness of the first feed gear 58 in the groove 58a is 1000 HV or more.

[0132] According to the above configuration, the hardness of the first feed gear 58 in the groove 58a is 1000 HV or more, so the first feed gear 58 is unlikely to wear out even if it comes into contact with the wire W in the groove 58a. Even if the binding operation is repeatedly performed, it is possible to suppress the first feed gear 58 from being worn out within the groove 58a. [Explanation of symbols]

[0133] 2:Rebar binding machine 34: Feeding unit 36: Cutting unit 38:Torsion unit 50:Feed motor 58: 1st feed gear 60: 2nd feed gear 66: Upper curl guide 76: Front guide pin 94: 1st cutting blade 96:Second cutting blade 98: 1st lever member 98a: 1st protrusion 100: Second lever member 100a: 2nd protrusion 110: 1st cutting opening 112:Second cutting opening 126:Screw shaft 128: Ball 130: Sleeve 132:Push plate 134: Ball groove 136:Shaft member 138:Left side holding member 140: Right side holding member 150: Contact member 152: First contact member 154:Second contact member 160, 170: Base material 162, 172: Surface layer L1, L2, L3: Thickness R: Rebar W:Wire

Claims

1. A rebar tying machine that ties rebars using wires, The reinforcing bar tying machine includes a contact member that comes into contact with the wire during a tying operation of tying the reinforcing bar using the wire, The contact member is A substrate; a surface layer covering at least a portion of a surface of the substrate and contacting the wire during the bundling operation; A rebar tying machine, wherein the hardness of the surface layer is higher than the hardness of the base material.

2. The reinforcing bar tying machine according to claim 1 , wherein the surface layer is made of ceramics.

3. 3. The rebar tie machine of claim 2, wherein the ceramic comprises tungsten carbide.

4. The rebar tying machine according to claim 1 , wherein the thickness of the surface layer is 10 micrometers or more.

5. The rebar tying machine of claim 4, wherein the thickness of the surface layer is less than or equal to 200 micrometers.

6. The rebar tying machine according to claim 1 , wherein the hardness of the surface layer is 900 HV or more.

7. A feed motor; A feed roller that rotates with the rotation of the feed motor and feeds the wire toward the reinforcing bar, The rebar binding machine according to claim 1 , wherein the contact member constitutes the feed roller.

8. a cutting blade for cutting the wire during the bundling operation; The rebar tie machine of claim 1 , wherein the contact member constitutes the cutting blade.

9. A rebar tying machine that ties rebars using wires, A first contact member; A second contact member that comes into contact with the first contact member and moves relatively to the first contact member during a binding operation in which the rebar binding machine binds the rebar using the wire, The first contact member is A first substrate; A first surface layer covering at least a portion of a surface of the first substrate, The second contact member is A second substrate; a second surface covering at least a portion of a surface of the second substrate and in contact with the first surface during the bundling operation; The hardness of the first surface layer is higher than the hardness of the first substrate, A rebar tying machine, wherein the hardness of the second surface layer is higher than the hardness of the second base material.

10. The reinforcing bar tying machine according to claim 9 , wherein each of the first surface layer and the second surface layer is made of ceramics.

11. The rebar tie of claim 10, wherein the ceramic comprises tungsten carbide.

12. The rebar tying machine according to claim 9 , wherein each of the first surface layer and the second surface layer has a thickness of 10 micrometers or more.

13. The rebar tie machine of claim 12, wherein each of the thicknesses of the first surface layer and the second surface layer is less than or equal to 200 micrometers.

14. The rebar tying machine according to claim 9, wherein the hardness of the first surface layer and the hardness of the second surface layer are each 900 HV or more.

15. The wire binding apparatus further includes a cutting unit for cutting the wire during the binding operation, The rebar tie machine of claim 9 , wherein the cutting unit comprises the first contact member and the second contact member.

16. A rebar tying machine that ties rebars using wires, The reinforcing bar tying machine includes a feed roller that feeds the wire toward the reinforcing bar when the reinforcing bar tying machine uses the wire to tie the reinforcing bar, The hardness of the surface layer of the feed roller is 900 HV or more.

17. A rebar tying machine that ties rebars using wires, A first feed roller that comes into contact with the wire when the wire is fed toward the reinforcing bar and is rotated by a motor; a second feed roller that contacts the wire as the wire is fed toward the rebar; The wire is sandwiched between the first feed roller and the second feed roller and fed toward the reinforcing bar by the rotation of the first feed roller, The first feed roller has a groove through which the wire passes as the wire is fed toward the reinforcing bar, A rebar binding machine, wherein the hardness of the first feed roller in the groove is 1000 HV or more.

Images