Rebar tying machine

Abstract

To provide a technique capable of binding reinforcing bars more tightly.SOLUTION: A reinforcing bar binding machine disclosed in this specification may bind reinforcing bars with wires. The reinforcing bar binding machine may include: a reel including a bobbin and the wire wound around the bobbin; a reel holding unit configured to rotatably hold the reel; a feeding unit configured to feed the wires from the reel around the reinforcing bars; and a twisting unit configured to twist the wires around the reinforcing bars. The total tensile maximum load of the wires around the reinforcing bars may be 1,050 N or more.SELECTED DRAWING: Figure 19

Description

Technical Field

[0005] ,

[0001] The disclosure of this specification relates to a steel bar tying machine.

Background Art

[0002] Patent Document 1 discloses a steel bar tying machine that ties steel bars with a wire. The steel bar tying machine includes a bobbin, a reel having the wire wound around the bobbin, a reel holding portion configured to rotatably hold the reel, a feeding portion configured to feed the wire from the reel around the steel bar, and a twisting portion configured to twist the wire around the steel bar. In this steel bar tying machine, an iron wire with a diameter of about 1 mm is used as the wire.

Prior Art Documents

Patent Documents

[0006] To firmly bind reinforcing bars, it is necessary to twist the wires surrounding the bars with strong force. However, if the total maximum tensile load of the wires surrounding the bars is small, twisting the wires with strong force may cause the wires to break. With the above configuration, the total maximum tensile load of the wires surrounding the bars is 1050N or more, so even when the wires surrounding the bars are twisted with strong force, wire breakage can be suppressed. By using such a configuration, reinforcing bars can be bound more firmly.

[0007] Another rebar tying machine disclosed herein may tie rebars with wire. The rebar tying machine may include a bobbin, a reel having the wire wound on the bobbin, a reel holder configured to rotatably hold the reel, a feeder configured to feed the wire from the reel around the rebar, and a twister configured to twist the wire around the rebar. The maximum tensile load per wire around the rebar may be 700 N or more.

[0008] To firmly bind reinforcing bars, it is necessary to twist the wires surrounding the bars with strong force. However, if the maximum tensile load per wire around the reinforcing bar is small, twisting the wires with strong force may cause them to break. With the above configuration, the maximum tensile load per wire around the reinforcing bar is 700N or more, so even when the wires around the reinforcing bar are twisted with strong force, wire breakage can be suppressed. By using this configuration, reinforcing bars can be bound more firmly.

[0009] Further rebar tying machines disclosed herein may tie rebars with wire. The rebar tying machine may include a bobbin, a reel having the wire wound on the bobbin, a reel holder configured to rotatably hold the reel, a feeder configured to feed the wire from the reel around the rebar, and a twister configured to twist the wire around the rebar. The total yield strength load of the wire around the rebar may be 700 N or more.

[0010] If the wires tying the reinforcing bars deform, a gap will form between the reinforcing bars and the wires, loosening the binding. Therefore, in order to firmly bind the reinforcing bars, it is necessary to make the wires tying the bars resistant to deformation. However, if the total yield strength load of the wires surrounding the reinforcing bars is small, there is a risk that the wires will deform if a strong force is applied to them. With the above configuration, the total yield strength load of the wires surrounding the reinforcing bars is 700N or more, so even if a strong force is applied to the wires tying the reinforcing bars, deformation of the wires can be suppressed. By using such a configuration, the reinforcing bars can be bound more firmly.

[0011] Further rebar tying machines disclosed herein may tie rebars with wire. The rebar tying machine may include a bobbin, a reel having the wire wound on the bobbin, a reel holder configured to rotatably hold the reel, a feeder configured to feed the wire from the reel around the rebar, and a twister configured to twist the wire around the rebar. The yield load per wire around the rebar may be 450 N or more.

[0012] If the wires tying the reinforcing bars deform, a gap will form between the reinforcing bars and the wires, causing the binding to loosen. Therefore, in order to firmly bind the reinforcing bars, it is necessary to make the wires tying the bars resistant to deformation. However, if the yield strength load per wire around the reinforcing bars is small, there is a risk that the wires will deform when a strong force is applied to them. With the above configuration, since the yield strength load per wire around the reinforcing bars is 450N or more, deformation of the wires can be suppressed even when a strong force is applied to them. By using such a configuration, the reinforcing bars can be bound more firmly. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view of the rebar tying machine 2 of the embodiment, taken from the rear left and above. [Figure 2] This is a perspective view of the rebar tying machine 2 of the embodiment, taken from the front, right, and above. [Figure 3] This is a side view showing the internal configuration of the rebar tying machine 2 in the embodiment. [Figure 4] This is a perspective view of the feed unit 38 of the embodiment. [Figure 5] This is a perspective view of the feed unit 38 and reel holder 10 of the embodiment. [Figure 6] This is a cross-sectional view of the front upper part of the rebar tying machine 2 of the embodiment. [Figure 7] This is a side view showing the state of the first lever member 76 and the second lever member 78 before they rotate in the cut section 44 of the embodiment. [Figure 8] This is a side view showing the state after the first lever member 76 and the second lever member 78 have rotated in the cut section 44 of the embodiment. [Figure 9] This is a perspective view of the twisted portion 46 of the embodiment. [Figure 10] This is a cross-sectional view of the torsion motor 86, reduction gear 88, and holding unit 90 of the embodiment. [Figure 11]Exploded perspective view of the carrier sleeve 98, clutch plate 100, and screw shaft 102 of the embodiment. [Figure 12] Perspective view of the clamp shaft 110 of the embodiment. [Figure 13] Perspective view of the state where the right clamp 112 and the left clamp 114 are attached to the clamp shaft 110 in the torsion part 46 of the embodiment. [Figure 14] Perspective view of the right clamp 112 of the embodiment. [Figure 15] Perspective view of the left clamp 114 of the embodiment. [Figure 16] Perspective view of the torsion motor 86, reduction part 88, and holding part 90 of the embodiment. [Figure 17] Perspective view of the rotation limiting part 92 of the embodiment. [Figure 18] Table about the wire W used in the reinforcing bar bundling machine of the comparative example. [Figure 19] Table about the wire W used in the reinforcing bar bundling machine 2 of the embodiment.

Mode for Carrying Out the Invention

[0014] 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 simply intended to show those skilled in the art the details for implementing the preferred examples of the present invention, and is not intended to limit the scope of the present invention. Also, 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.

[0015] Furthermore, the combinations of features and processes disclosed in the following detailed description are not essential for carrying out the present invention in the broadest sense, and are described solely to illustrate representative examples of the present invention. Moreover, the various features of the representative examples described above and below, as well as the various features described in the independent and dependent claims, do not necessarily have to be combined in the same way as the examples described herein or in the order listed, in order to provide additional and useful embodiments of the present invention.

[0016] 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.

[0017] In one or more embodiments, the rebar tying machine may tie rebars together with wire. The rebar tying machine may include a bobbin, a reel having the wire wound around the bobbin, a reel holder configured to rotatably hold the reel, a feeder configured to feed the wire from the reel around the rebar, and a twister configured to twist the wire around the rebar. The total maximum tensile load of the wire around the rebar may be 1050 N or more.

[0018] In one or more embodiments, the total maximum tensile load of the wire around the reinforcing bar may be in the range of 1050 N to 4700 N.

[0019] Generally, to increase the total maximum tensile load of the wires surrounding the reinforcing bar, it is necessary to increase the number and diameter of the wires. However, if the number and diameter of the wires are too large, there is a risk that an excessive load will be applied to the power source that drives the twisted section. With the above configuration, it is possible to tie the reinforcing bar more firmly while suppressing the application of an excessive load to the power source that drives the twisted section.

[0020] In one or more embodiments, the rebar tying machine may tie the rebars together with wire. The rebar tying machine may include a bobbin, a reel having the wire wound around the bobbin, a reel holder configured to rotatably hold the reel, a feeder configured to feed the wire from the reel around the rebar, and a twister configured to twist the wire around the rebar. The total yield strength load of the wire around the rebar may be 700 N or more.

[0021] In one or more embodiments, the total yield point load of the wire around the reinforcing bar may be in the range of 700 N to 2550 N.

[0022] Generally, if the total yield point load of the wires surrounding the reinforcing bar is too large, the wires will not adhere tightly to the outer surface of the reinforcing bar, creating gaps between the wires and the bar, making it difficult to securely tie the reinforcing bar. The above configuration allows for a more secure tie-up of the reinforcing bar.

[0023] In one or more embodiments, the twisting portion may include a tip-holding portion configured to hold the end of the wire fed out around the reinforcing bar. The feed portion may be configured to pull back the wire after the tip-holding portion has held the end of the wire but before the twisting portion twists the wire.

[0024] With the above configuration, the feed section pulls the wire back, allowing the twisting section to twist the wire from a state where the wire is more closely attached to the reinforcing bar. This configuration allows for a stronger binding of the reinforcing bars.

[0025] In one or more embodiments, the diameter of the wire may be 1.6 mm or more.

[0026] The above configuration allows for a more secure binding of reinforcing bars.

[0027] In one or more embodiments, the diameter of the bobbin body may be 50 mm or more.

[0028] The above configuration makes it possible to suppress the coiling that occurs in the wire due to being wound on a bobbin.

[0029] In one or more embodiments, the feeding unit may include a feed roller that feeds the wire by rotation. The hardness of the feed roller may be 56 HRC or higher.

[0030] With the above configuration, wear on the feed rollers when the feed unit feeds out the wire can be suppressed.

[0031] In one or more embodiments, the rebar tying machine may further include a cutting section equipped with a cutter for cutting the wire. The hardness of the cutter may be 56 HRC or higher.

[0032] With the above configuration, wear on the cutter can be suppressed when the cutting section feeds out the wire.

[0033] In one or more embodiments, the rebar tying machine may further include a grip for the user to grasp. The rebar tying machine may be capable of performing the rebar tying operation while the user holds it by hand.

[0034] With the above configuration, reinforcing bars can be tied more securely using a handheld rebar tying machine.

[0035] In one or more embodiments, the rebar tying machine may tie rebars together with wire. The rebar tying machine may include a bobbin, a reel having the wire wound around the bobbin, a reel holder configured to rotatably hold the reel, a feeder configured to feed the wire from the reel around the rebar, and a twister configured to twist the wire around the rebar. The maximum tensile load per wire around the rebar may be 700 N or more.

[0036] In one or more embodiments, the rebar tying machine may tie the rebars together with wire. The rebar tying machine may include a bobbin, a reel having the wire wound around the bobbin, a reel holder configured to rotatably hold the reel, a feeder configured to feed the wire from the reel around the rebar, and a twister configured to twist the wire around the rebar. The yield point load per wire around the rebar may be 450 N or more.

[0037] (Examples) The rebar tying machine 2 shown in Figure 1 ties multiple reinforcing bars R together using wire W. The rebar tying machine 2 comprises a main body 4, a grip 6, a battery mounting section 8, a battery pack B, and a reel holder 10. The grip 6 is held by the user. The grip 6 is located at the lower rear of the main body 4. The grip 6 is integrally formed with the main body 4. A trigger 12 is provided on the upper front of the grip 6. Inside the grip 6 is a trigger switch 14 (see Figure 3) that detects whether or not the trigger 12 is pressed. The battery mounting section 8 is located below the grip 6. The battery mounting section 8 is integrally formed with the grip 6. The battery pack B can be attached and detached by sliding it against the battery mounting section 8. The battery pack B is equipped with a secondary battery, such as a lithium-ion battery. The reel holder 10 is located at the lower front of the main body 4. The reel holder 10 is located in front of the grip 6. In this embodiment, the longitudinal direction of the twisted portion 46, which will be described later, is referred to as the front-to-back direction, the direction perpendicular to the front-to-back direction is 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 is referred to as the left-to-right direction.

[0038] The rebar tying machine 2 is equipped with a housing 16. The housing 16 constitutes part of the support section 15. As shown in Figure 2, the housing 16 comprises a right housing 18, a left housing 20, and a motor cover 22. The right housing 18 defines the shape of the main body 4, the grip 6, and the right half of the battery mounting section 8. The left housing 20 defines the shape of the main body 4, the grip 6, and the left half of the battery mounting section 8. The motor cover 22 is mounted on the outside of the right housing 18. As shown in Figure 1, an operation display unit 24 is located on the upper rear side of the left housing 20. The operation display unit 24 comprises a main power switch 24a and a main power LED 24b. The main power switch 24a accepts user input to switch the main power of the rebar tying machine 2 on / off. The main power LED 24b indicates the on / off status of the main power of the rebar tying machine 2.

[0039] As shown in Figure 2, the reel holder 10 comprises a holder housing 26, a main cover 28, and an auxiliary cover 30. The holder housing 26 and the auxiliary cover 30 constitute part of the support portion 15. The holder housing 26 is fixed to the front lower part of the main body 4 and to the front of the battery mounting portion 8. The left end of the holder housing 26 is open. The main cover 28 is attached to the holder housing 26 so as to be rotatable around a pivot axis 26a at the bottom of the holder housing 26. The main cover 28 is biased in the opening direction by a torsion spring 31 (see Figure 3). A closed state detection sensor (not shown) is attached to the holder housing 26 to detect when the main cover 28 is closed. The auxiliary cover 30 covers the right side of the holder housing 26. The auxiliary cover 30 defines an auxiliary space 30a between itself and the right side of the holder housing 26.

[0040] As shown in Figure 1, a lock lever 32 for holding the main cover 28 closed is located at the lower front of the left housing 20. When the lock lever 32 is rotated, the biasing force of the torsion spring 31 (see Figure 3) causes the main cover 28 to open relative to the holder housing 26. When the main cover 28 is closed, the holder housing 26 and the main cover 28 define a storage space 26b (see Figure 3). A reel 33 (see Figure 3) equipped with wire W is placed in the storage space 26b. As shown in Figure 2, a hole 26c is formed on the front surface of the holder housing 26. The user can check the remaining amount of wire W on the reel 33 by looking at the reel 33 through the hole 26c.

[0041] As shown in Figure 3, the rebar tying machine 2 is equipped with a control circuit board 36. The control circuit board 36 is located inside the battery mounting section 8. The control circuit board 36 is electrically connected to the battery pack B, the trigger switch 14, and the operation display section 24 by wiring (not shown). The control circuit board 36 is also electrically connected to a closed state detection sensor (not shown) attached to the holder housing 26 by wiring (not shown).

[0042] The rebar tying machine 2 comprises a feeding section 38, a guide section 40, a cutting section 44, and a twisting section 46. The feeding section 38 is located inside the lower front part of the main body 4. The guide section 40 is located at the front of the main body 4. The cutting section 44 is located inside the lower part of the main body 4. The twisting section 46 is located inside the main body 4.

[0043] (Configuration of the feeding unit 38) As shown in Figure 4, the feed unit 38 comprises a feed motor 50, a reduction unit 52, and a feed unit 54. The feed motor 50 is, for example, a brushless DC motor. The feed motor 50 is located to the right of the right housing 18 (see Figure 2) and is covered by a motor cover 22 (see Figure 2). The feed motor 50 is electrically connected to the control circuit board 36 by wiring (not shown). The feed motor 50 operates on power supplied from the battery pack B (see Figure 2).

[0044] The reduction unit 52 includes, for example, a planetary gear mechanism. The reduction unit 52 reduces the rotation of the feed motor 50.

[0045] The feed unit 54 includes a base member 56, a guide member 58, a drive gear 60, a first feed gear 62, a second feed gear 64, a release lever 66, and a compression spring 68. The guide member 58 is fixed to the base member 56. The guide member 58 has a guide hole 58a. The guide hole 58a has a tapered shape, wider at the lower end and narrower at the upper end. A wire W is inserted through the guide hole 58a.

[0046] The drive gear 60 receives rotation from the reduction gear 52. The first feed gear 62 is rotatably supported on the base member 56. The first feed gear 62 meshes with the drive gear 60. The first feed gear 62 rotates due to the rotation of the drive gear 60. The first feed gear 62 has a groove 62a. The groove 62a is formed on the outer circumferential surface of the first feed gear 62 in a direction along the rotational direction of the first feed gear 62. The second feed gear 64 meshes with the first feed gear 62. The second feed gear 64 is rotatably supported on the release lever 66. The second feed gear 64 has a groove 64a. The groove 64a is formed on the outer circumferential surface of the second feed gear 64 in a direction along the rotational direction of the second feed gear 64. The release lever 66 is pivotably supported on the base member 56 via a pivot shaft 66a. The compression spring 68 biases the release lever 66 toward the right housing 18 (see Figure 2), causing the second feed gear 64 to move toward the first feed gear 62. This causes the second feed gear 64 to press against the first feed gear 62. As a result, the wire W is held between the groove 62a of the first feed gear 62 and the groove 64a of the second feed gear 64. As shown in Figure 5, when the lock lever 32 is rotated in the direction that releases the main cover 28, the lower end of the release lever 66 is pushed in by the lock lever 32 and moves toward the right housing 18. This causes the second feed gear 64 to move away from the first feed gear 62. In this state, the user can set the wire W of the reel 33 (see Figure 4) between the groove 62a of the first feed gear 62 and the groove 64a of the second feed gear 64. As shown in Figure 2, windows 16a are formed on the front of the left housing 20 and the front of the motor cover 22, allowing the user to visually see where the first feed gear 62 and the second feed gear 64 mesh.

[0047] As shown in Figure 4, the wire W is held between the groove 62a of the first feed gear 62 and the groove 64a of the second feed gear 64, and the feed motor 50 rotates, causing the wire W to move. In this embodiment, when the feed motor 50 rotates forward, the drive gear 60 rotates in the direction D1 shown in Figure 4, and the wire W is fed out from the reel 33 toward the guide section 40. When the feed motor 50 rotates backward, the drive gear 60 rotates in the direction D2 shown in Figure 4, and the wire W is pulled back from the feed section 38 toward the reel 33.

[0048] (Configuration of the guide section 40) As shown in Figure 6, the guide section 40 includes an upper curl guide 70 and a lower curl guide 71. The upper curl guide 70 and the lower curl guide 71 are located at the front of the main body 4. The lower end of the upper curl guide 70 is open downwards. This forms an upper wire passage 70a in the upper curl guide 70. The lower curl guide 71 is located below the upper curl guide 70. The upper end of the lower curl guide 71 is open upwards. This forms a lower wire passage 71a in the lower curl guide 71.

[0049] The wire W fed from the feed section 38 (see Figure 4) is sent to the upper wire passage 70a. The wire W passes through the upper wire passage 70a from the rear to the front. At this time, the wire W is given a downward coiling tendency. After passing through the upper wire passage 70a, the wire W is sent to the lower wire passage 71a. The wire W passes through the lower wire passage 71a from the front to the rear. As a result, the wire W is wound around the reinforcing bar R.

[0050] (Configuration of the cut section 44) As shown in Figure 7, the cutting section 44 includes a fixed cutter member 72, a movable cutter member 74, a first lever member 76, a second lever member 78, a link member 80, and a torsion spring 82. As shown in Figure 6, the fixed cutter member 72 and the movable cutter member 74 are arranged on a passage through which the wire W is fed from the feed section 38 toward the guide section 40. The fixed cutter member 72 has a hole 72a through which the wire W can pass. The movable cutter member 74 is supported by the fixed cutter member 72 so as to be rotatable by sliding around the fixed cutter member 72. The movable cutter member 74 has a hole 74a through which the wire W can pass. As shown in Figure 7, when the hole 72a of the fixed cutter member 72 and the hole 74a of the movable cutter member 74 are in communication (hereinafter also referred to as the communication state), the wire W can pass through the hole 72a of the fixed cutter member 72 and the hole 74a of the movable cutter member 74. When the movable cutter member 74 rotates relative to the fixed cutter member 72 in the direction D3 shown in Figure 6 (hereinafter also referred to as the cutting state), the wire W is cut by the fixed cutter member 72 and the movable cutter member 74.

[0051] As shown in Figure 7, the first lever member 76 and the second lever member 78 are fixed to each other. The first lever member 76 and the second lever member 78 are pivotable around axis RX. The lower ends of the first lever member 76 and the second lever member 78 are rotatably connected to the rear end of a link member 80. The front end of the link member 80 is rotatably connected to the lower end of the movable cutter member 74. The rear end of the link member 80 is biased forward by a torsion spring 82. When the lower ends of the first lever member 76 and the second lever member 78 pivot forward, the link member 80 moves forward, and the fixed cutter member 72 and the movable cutter member 74 are in communication. As shown in Figure 8, when the lower ends of the first lever member 76 and the second lever member 78 pivot rearward, the link member 80 moves rearward, and the fixed cutter member 72 and the movable cutter member 74 are in a cutting state.

[0052] (Structure of the twisted portion 46) As shown in Figure 9, the torsion section 46 comprises a torsion motor 86, a reduction section 88, a holding section 90, and a rotation limiting section 92. The torsion motor 86 is, for example, a brushless DC motor. The torsion motor 86 is fixed to the right housing 18 (see Figure 1) and the left housing 20 (see Figure 1). The torsion motor 86 is electrically connected to the control circuit board 36 (see Figure 3) by wiring (not shown). The torsion motor 86 operates on power supplied from the battery pack B (see Figure 1).

[0053] The reduction unit 88 is fixed to the right housing 18 and the left housing 20. The reduction unit 88 includes, for example, a planetary gear mechanism. The reduction unit 88 reduces the rotation of the torsion motor 86.

[0054] As shown in Figure 10, the holding portion 90 includes a bearing box 96, a carrier sleeve 98, a clutch plate 100, a screw shaft 102, an inner sleeve 104, an outer sleeve 106, a push plate 108, a clamp shaft 110, a right clamp 112, and a left clamp 114.

[0055] The bearing box 96 is fixed to the reduction gear 88. The bearing box 96 rotatably supports the carrier sleeve 98 via the bearing 96a. Rotation is transmitted to the carrier sleeve 98 from the reduction gear 88. When the torsion motor 86 rotates forward, the carrier sleeve 98 rotates in the direction of a left-hand thread when viewed from the rear. When the torsion motor 86 rotates backward, the carrier sleeve 98 rotates in the direction of a right-hand thread when viewed from the rear.

[0056] As shown in Figure 11, a clutch groove 98a extending in the front-rear direction is formed on the inner surface of the rear of the carrier sleeve 98. A first wall portion 98b and a second wall portion 98c are formed at the front end of the clutch groove 98a. The distance in the front-rear direction from the rear end of the carrier sleeve 98 to the first wall portion 98b is smaller than the distance in the front-rear direction from the rear end of the carrier sleeve 98 to the second wall portion 98c. The clutch plate 100 is located inside the carrier sleeve 98. The clutch plate 100 has a clutch piece 100a formed on it that corresponds to the clutch groove 98a. The clutch plate 100 is biased towards the rear of the carrier sleeve 98 by a compression spring 116 located inside the carrier sleeve 98. The clutch plate 100 can advance relative to the carrier sleeve 98 to a position where the clutch piece 100a contacts the first wall portion 98b of the clutch groove 98a. When the wire W is twisted, the carrier sleeve 98 rotates in the left-hand thread direction when viewed from the rear of the clutch plate 100, allowing the clutch plate 100 to advance relative to the carrier sleeve 98 until the clutch piece 100a contacts the second wall portion 98c of the clutch groove 98a.

[0057] The rear portion 102a of the screw shaft 102 is inserted into the carrier sleeve 98 from the front and fixed to the clutch plate 100. A radially projecting flange 102c is formed between the rear portion 102a and the front portion 102b of the screw shaft 102. A helical ball groove 102d is formed on the outer circumferential surface of the front portion 102b of the screw shaft 102. An engagement portion 102e, smaller in diameter than the front portion 102b, is formed at the front end of the screw shaft 102.

[0058] As shown in Figure 10, a compression spring 118 is attached to the front portion 102b of the screw shaft 102. The front portion 102b of the screw shaft 102 is inserted into the inner sleeve 104 from the rear. The inner sleeve 104 has a ball hole 104a for holding a ball 120. The ball 120 fits into the ball groove 102d of the screw shaft 102. A flange 104b that protrudes radially is formed at the rear end of the inner sleeve 104. The inner sleeve 104 is inserted into the outer sleeve 106 from the rear. The outer sleeve 106 is fixed to the inner sleeve 104. If the rotation of the outer sleeve 106 is permitted by the rotation limiting portion 92 (see Figure 17), when the screw shaft 102 rotates, the inner sleeve 104 and the outer sleeve 106 rotate together. When the rotation of the outer sleeve 106 is prohibited by the rotation limiting unit 92, when the screw shaft 102 rotates, the inner sleeve 104 and outer sleeve 106 move in the front-rear direction relative to the screw shaft 102. Specifically, when the torsion motor 86 rotates forward and the screw shaft 102 rotates in the left-hand thread direction when viewed from the rear, the inner sleeve 104 and outer sleeve 106 move forward relative to the screw shaft 102. Also, when the torsion motor 86 rotates backward and the screw shaft 102 rotates in the right-hand thread direction when viewed from the rear, the inner sleeve 104 and outer sleeve 106 move backward relative to the screw shaft 102. The push plate 108 is positioned between the rear end of the outer sleeve 106 and the flange 104b of the inner sleeve 104. Therefore, when the inner sleeve 104 and outer sleeve 106 move in the front-rear direction, the push plate 108 also moves in the front-rear direction. A slit 106a is formed in the front part of the outer sleeve 106, extending from the front end toward the rear.

[0059] The clamp shaft 110 is inserted into the inner sleeve 104 from the front. The engagement portion 102e of the screw shaft 102 is inserted into the rear end of the clamp shaft 110. The clamp shaft 110 is fixed to the screw shaft 102. As shown in Figure 12, the clamp shaft 110 has a flat plate portion 110a, an opening 110b, and a flange 110c. The flat plate portion 110a is located at the front end of the clamp shaft 110 and has a flat plate shape along the vertical and front-rear directions. The flat plate portion 110a has a hole 110d into which a pin 122 (see Figure 13) fits. The opening 110b is located behind the flat plate portion 110a. The opening 110b penetrates the clamp shaft 110 in the left-right direction and extends in the front-rear direction. The flange 110c is located behind the opening 110b and protrudes radially.

[0060] As shown in Figure 13, the right clamp 112 is attached to the clamp shaft 110 so as to pass through the opening 110b of the clamp shaft 110 from right to left. The left clamp 114 is attached to the clamp shaft 110 below the right clamp 112 so as to pass through the opening 110b of the clamp shaft 110 from left to right.

[0061] As shown in Figure 14, the right clamp 112 comprises a base portion 112a, a lower projection 112b, an upper projection 112c, a contact portion 112d, an upper guard portion 112e, and a front guard portion 112f. The base portion 112a has a flat plate shape along the front-rear and left-right directions. The lower projection 112b is located at the right end of the base portion 112a and protrudes downward from the base portion 112a. The upper projection 112c is located at the right front end of the base portion 112a and protrudes upward from the base portion 112a. The contact portion 112d protrudes to the left from the upper end of the upper projection 112c. The upper guard portion 112e receives and protrudes to the left from the upper end of the contact portion 112d. The front guard portion 112f protrudes to the left from the front end of the upper projection portion 112c and the contact portion 112d. Cam holes 112g and 112h are formed in the base portion 112a. The cam holes 112g and 112h have a shape that extends from the rear end to the front end, first toward the front, then bends and extends toward the front right, and then bends again and extends toward the front.

[0062] As shown in Figure 15, the left clamp 114 comprises a base portion 114a, a pin holding portion 114b, a lower projection portion 114c, a contact portion 114d, a rear guard portion 114e, and a front guard portion 114f. The base portion 114a has a flat plate shape along the front-rear and left-right directions. The pin holding portion 114b is located at the left front end of the base portion 114a and is located above the base portion 114a, slidably holding the pin 122 (see Figure 13). The lower projection portion 114c is located at the left front end of the base portion 114a and protrudes downward from the base portion 114a. The contact portion 114d protrudes to the right from the lower end of the lower projection portion 114c. The rear guard portion 114e protrudes to the right from the rear end of the contact portion 114d. The front guard portion 114f protrudes to the right from the front end of the contact portion 114d. Cam holes 114g and 114h are formed in the base portion 114a. The cam holes 114g and 114h have a shape that extends from the rear end to the front end, first towards the front, then bends and extends towards the left front, then bends and extends towards the front, then bends and extends towards the left front, and then bends and extends towards the front.

[0063] As shown in Figure 13, with the right clamp 112 and the left clamp 114 attached to the clamp shaft 110, the cam sleeve 124 is positioned to pass through the cam holes 112g and 114g, and the cam sleeve 126 is positioned to pass through the cam holes 112h and 114h. In addition, the support pin 128 is positioned to pass through the cam sleeve 124, and the support pin 130 is positioned to pass through the cam sleeve 126. An annular cushion 131 is attached between the right clamp 112 and the left clamp 114 and the flange 110c of the clamp shaft 110.

[0064] As shown in Figure 9, when the clamp shaft 110 is attached to the inner sleeve 104, the right clamp 112 and the left clamp 114 enter into the slit 106a of the outer sleeve 106, and the support pins 128 and 130 are connected to the outer sleeve 106. When the clamp shaft 110 moves in the front-rear direction relative to the outer sleeve 106, the cam sleeve 124 attached to the support pin 128 moves in the front-rear direction within the cam holes 112g and 114g, and the cam sleeve 126 attached to the support pin 130 moves in the front-rear direction within the cam holes 112h and 114h, causing the right clamp 112 and the left clamp 114 to move in the left-right direction.

[0065] As shown in Figure 13, in the initial state where the clamp shaft 110 protrudes forward from the outer sleeve 106, the right clamp 112 is positioned furthest to the right relative to the left clamp 114. In this state, a right-side wire passage 132 through which the wire W can pass is formed between the upper protrusion 112c of the right clamp 112 and the flat plate portion 110a of the clamp shaft 110, and the upper side of the right-side wire passage 132 is covered by the upper guard portion 112e. This state of the right clamp 112 is called the fully open state. From this state, when the outer sleeve 106 moves forward relative to the clamp shaft 110, the right clamp 112 moves to the left toward the clamp shaft 110. In this state, the wire W is clamped between the lower end of the contact portion 112d of the right clamp 112 and the upper end of the flat plate portion 110a of the clamp shaft 110, and the front side of the right-side wire passage 132 is covered by the front guard portion 112f. This state of the right clamp 112 is called the fully closed state.

[0066] In the initial state, when the clamp shaft 110 protrudes forward from the outer sleeve 106, the left clamp 114 is located furthest to the left of the clamp shaft 110. In this state, a left wire passage 134 is formed between the lower protrusion 114c of the left clamp 114 and the flat plate portion 110a of the clamp shaft 110, through which the wire W can pass. This state of the left clamp 114 is called the fully open state. From this state, when the outer sleeve 106 moves forward relative to the clamp shaft 110, the left clamp 114 moves to the right toward the clamp shaft 110. Even in this state, the wire W can pass through the left wire passage 134, but the rear side of the left wire passage 134 is covered by the rear guard portion 114e, and the front side of the left wire passage 134 is covered by the front guard portion 114f. This state of the left clamp 114 is called the half-open state. From this state, if the outer sleeve 106 moves further forward relative to the clamp shaft 110, the left clamp 114 moves further to the right toward the clamp shaft 110. In this state, the wire W is clamped between the upper end of the contact portion 114d of the left clamp 114 and the lower end of the flat portion 110a of the clamp shaft 110. This state of the left clamp 114 is called the fully closed state.

[0067] The wire W, which is fed from the feed section 38 (see Figure 6) to the guide section 40 (see Figure 6), passes through the left wire passage 134 before reaching the guide section 40. As a result, the left clamp 114 is fully closed, and when the wire W is cut by the cutting section 44 (see Figure 6), the left clamp 114 and the clamp shaft 110 hold the end of the wire W that is wound around the reinforcing bar R.

[0068] Furthermore, the wire W guided by the guide section 40 passes through the right wire passage 132. Therefore, when the right clamp 112 is fully closed, the tip of the wire W wound around the reinforcing bar R is held by the right clamp 112 and the clamp shaft 110.

[0069] As shown in Figure 16, fins 138 are formed on the rear outer surface of the outer sleeve 106. The fins 138 extend in the front-rear direction. In this embodiment, eight fins 138 are arranged on the outer circumferential surface of the outer sleeve 106 at 45-degree intervals from each other. In this embodiment, the eight fins 138 consist of seven short fins 138a and one long fin 138b. The length of the long fin 138b in the front-rear direction is longer than the length of the short fin 138a in the front-rear direction. In the front-rear direction, the position of the rear end of the long fin 138b is the same as the position of the rear end of the short fin 138a. In the front-rear direction, the position of the front end of the long fin 138b is forward of the position of the front end of the short fin 138a.

[0070] The rotation limiting section 92 is positioned to correspond to the fins 138 of the outer sleeve 106. The rotation limiting section 92 cooperates with the fins 138 to allow or prohibit the rotation of the outer sleeve 106. As shown in Figure 17, the rotation limiting section 92 comprises a base member 140, an upper stopper 142, a lower stopper 144, and torsion springs 146 and 148. The base member 140 is fixed to the right housing 18 (see Figure 1). The upper stopper 142 is pivotably supported on the upper part of the base member 140 via a pivot shaft 140a. The upper stopper 142 includes a restricting piece 142a. The restricting piece 142a is located below the upper stopper 142. The torsion spring 146 biases the restricting piece 142a in an outward direction (i.e., in a direction away from the base member 140). The lower stopper 144 is pivotably supported on the lower part of the base member 140 via a pivot shaft 140b. The lower stopper 144 includes a restricting piece 144a. The restricting piece 144a is located on the upper part of the lower stopper 144. The rear end of the restricting piece 144a is positioned in front of the rear end of the restricting piece 142a. A torsion spring 148 biases the restricting piece 144a in a direction that opens it outward (i.e., in a direction that moves the restricting piece 144a away from the base member 140).

[0071] Regarding the upper stopper 142, when the torsion motor 86 (see Figure 10) rotates forward and the screw shaft 102 (see Figure 10) rotates in the left-hand thread direction when viewed from the rear, the fins 138 (see Figure 16) of the outer sleeve 106 come into contact with the restricting piece 142a, and the rotation of the outer sleeve 106 is prohibited by the upper stopper 142. On the other hand, when the torsion motor 86 rotates backward and the screw shaft 102 rotates in the right-hand thread direction when viewed from the rear, the fins 138 of the outer sleeve 106 come into contact with the restricting piece 142a and push the restricting piece 142a inward. In this case, the upper stopper 142 does not prohibit the rotation of the outer sleeve 106.

[0072] Regarding the lower stopper 144, when the torsion motor 86 rotates in the forward direction and the screw shaft 102 rotates in the left-hand thread direction when viewed from the rear, the fins 138 of the outer sleeve 106 will continue to push the restricting piece 144a even if they come into contact with it. In this case, the lower stopper 144 does not prevent the rotation of the outer sleeve 106. On the other hand, when the screw shaft 102 rotates in the right-hand thread direction when viewed from the rear, the fins 138 of the outer sleeve 106 will come into contact with the restricting piece 144a, and the rotation of the outer sleeve 106 will be prevented by the lower stopper 144.

[0073] Next, the operation of the rebar tying machine 2 shown in Figure 1 will be described. When the trigger 12 is operated by the user, the rebar tying machine 2 performs a tying operation. When the rebar tying machine 2 performs a tying operation, the following steps are performed: feeding process, tip holding process, pulling back process, end holding process, cutting process, twisting process, and return process.

[0074] (Feed-out process) When the feed motor 50 shown in Figure 4 rotates forward from the initial state of the rebar tying machine 2 (i.e., rotates in direction D1 shown in Figure 4), the feed unit 38 feeds out a predetermined length of wire W from the reel 33. The tip of the wire W passes through the fixed cutter member 72, the movable cutter member 74, the left wire passage 134, the guide unit 40, and the right wire passage 132 in that order. As a result, the wire W is wound around the rebar R in a circular pattern. When the feeding of the wire W is complete, the feed motor 50 stops.

[0075] (Tip holding process) After the feeding process is complete, when the torsion motor 86 shown in Figure 10 rotates in the forward direction, the screw shaft 102 rotates in the left-hand thread direction. At this time, the rotation limiting unit 92 prevents the outer sleeve 106 from rotating in the left-hand thread direction. As a result, the outer sleeve 106, together with the inner sleeve 104, moves forward relative to the clamp shaft 110, causing the right clamp 112 to be fully closed and the left clamp 114 to be half-open. This holds the tip of the wire W between the right clamp 112 and the clamp shaft 110. When it is detected that the tip of the wire W is being held, the torsion motor 86 stops.

[0076] (Retraction process) After the tip holding process is complete, when the feed motor 50 shown in Figure 4 rotates in the reverse direction (i.e., in direction D2 shown in Figure 4), the feed unit 38 pulls back the wire W that has been wound around the reinforcing bar R. Because the tip of the wire W is held by the right clamp 112 and the clamp shaft 110, the wire W around the reinforcing bar R is reduced in diameter. When the wire W has been pulled back, the feed motor 50 stops.

[0077] (Terminal holding process) After the pull-back process is complete, when the torsion motor 86 shown in Figure 10 rotates in the forward direction, the screw shaft 102 rotates in the left-hand thread direction. At this time, the outer sleeve 106 is prevented from rotating in the left-hand thread direction by the rotation limiting unit 92. As a result, the outer sleeve 106, together with the inner sleeve 104, moves forward relative to the clamp shaft 110, and the left clamp 114 becomes fully closed. This holds the end of the wire W between the left clamp 114 and the clamp shaft 110.

[0078] (cutting process) After the end-holding process is completed, the torsion motor 86 shown in Figure 10 rotates further in the forward direction, causing the screw shaft 102 to rotate in the left-hand thread direction. At this time, the outer sleeve 106 is prevented from rotating in the left-hand thread direction by the rotation limiting unit 92. As a result, the outer sleeve 106, together with the inner sleeve 104, moves further forward relative to the clamp shaft 110, and as shown in Figure 8, the push plate 108 pushes down the upper end of the second lever member 78 toward the front. This causes the wire W to be cut by the fixed cutter member 72 and the movable cutter member 74. Once the cutting of the wire W is complete, the torsion motor 86 stops.

[0079] (Twisting process) After the cutting process is complete, the torsion motor 86 shown in Figure 10 rotates further in the forward direction, causing the screw shaft 102 to rotate in the left-hand thread direction. At this time, the outer sleeve 106 is allowed to rotate in the left-hand thread direction by the rotation limiting section 92. As a result, the outer sleeve 106, inner sleeve 104, clamp shaft 110, right clamp 112, and left clamp 114 rotate together in the left-hand thread direction. This twists the wire W wound around the reinforcing bar R. Once the twisting of the wire W is complete, the torsion motor 86 stops.

[0080] (Recovery process) After the cutting process is completed, or after the twisting process is completed, when the torsion motor 86 shown in Figure 10 rotates in the reverse direction, the screw shaft 102 rotates in the right-hand thread direction. At this time, the outer sleeve 106 is prevented from rotating in the right-hand thread direction by the rotation limiting unit 92. Therefore, the outer sleeve 106, together with the inner sleeve 104, retracts relative to the clamp shaft 110. The left clamp 114 goes from a half-open state to a fully open state, and the right clamp 112 also goes to a fully open state. After that, when rotation in the right-hand thread direction is permitted by the rotation limiting unit 92, the outer sleeve 106, inner sleeve 104, clamp shaft 110, right clamp 112, and left clamp 114 rotate together in the right-hand thread direction. When the long fin 138b contacts the lower stopper 144, the rotation of the outer sleeve 106 is prohibited again, and the outer sleeve 106, together with the inner sleeve 104, retracts again relative to the clamp shaft 110. When it is detected that the torsion part 46 has returned to its initial state, the torsion motor 86 stops.

[0081] In the rebar tying machine 2 of this embodiment, it is possible to perform a single-wrap tying operation in which the wire W is wrapped once around the rebar R and one wire W is twisted, or to perform a double-wrap tying operation in which the wire W is wrapped twice around the rebar R and two wires W are twisted simultaneously.

[0082] (Single-wrap binding method) When performing a single-wrap tying operation, the rebar tying machine 2 sequentially executes the following steps: feeding process, tip holding process, pulling back process, end holding process, cutting process, twisting process, and return process. In this case, the wire W is fed out by the feeding section 38, the tip of the wire W is held by the twisting section 46, the wire W is pulled back by the feeding section 38, the end of the wire W is also held by the twisting section 46, and the wire W is cut by the cutting section 44. From this state, the wire W is twisted by the twisting section 46.

[0083] (Two-turn binding method) When performing a double-wrap tying operation, the rebar tying machine 2 first executes the feeding process, tip holding process, pull-back process, end holding process, and cutting process in order, and then performs the return process. In this case, the first turn of wire W is fed out by the feeding section 38, the tip of the first turn of wire W is held by the twisting section 46, the first turn of wire W is pulled back by the feeding section 38, the end of the first turn of wire W is also held by the twisting section 46, and the first turn of wire W is cut by the cutting section 44. From this state, the twisting section 46 releases the holding of the tip and the rear end of the first turn of wire W. After that, the rebar tying machine 2 executes the feeding process, tip holding process, pull-back process, end holding process, cutting process, twisting process, and initial state return process in order. In this case, the feed section 38 feeds out the second turn of wire W, the twisting section 46 holds the tip of the first turn of wire W and the tip of the second turn of wire W, the feed section 38 pulls back the second turn of wire W, the twisting section 46 holds the end of the first turn of wire W and the end of the second turn of wire W, and the cutting section 44 cuts the second turn of wire W. From this state, the twisting section 46 twists the first turn of wire W and the second turn of wire W.

[0084] (Reel 33 configuration) As shown in Figure 3, the reel 33 is rotatably held in the reel holder 10. As shown in Figure 4, the reel 33 comprises a bobbin 160 and a wire W wound around the bobbin 160. The bobbin 160 has a substantially cylindrical body and substantially disc-shaped flanges located at both ends of the body, and the wire W is wound around the body of the bobbin 160.

[0085] Figure 18 shows the tensile strength, wire diameter, cross-sectional area, number of turns, total cross-sectional area, total maximum tensile load, yield stress, and total yield point load of wire W used in a conventional rebar tying machine (not shown) as a comparative example. Figure 19 shows the tensile strength, wire diameter, cross-sectional area, number of turns, total cross-sectional area, total maximum tensile load, yield stress, and total yield point load of wire W used in the rebar tying machine 2 of this embodiment. In this specification, the yield stress of wire W refers to the stress at which the strain of wire W becomes 0.2% (the so-called 0.2% proof stress), and the (total) yield point load of wire W refers to the (total) load at which the strain of wire W becomes 0.2%.

[0086] As shown in Figure 19, the rebar tying machine 2 of this embodiment can use various wires W. For example, the material of the wire W may be annealed iron wire, galvanized wire, polyester coated wire, stainless steel wire, etc. When the wire W is made of annealed iron wire, galvanized wire, or polyester coated wire, the tensile strength of the wire W is, for example, about 350 MPa, and the yield stress of the wire W is, for example, about 233 MPa. When the wire W is made of stainless steel wire, the tensile strength of the wire W is, for example, about 510 MPa, and the yield stress of the wire W is, for example, about 279 MPa. The material of the wire W may be changed to a material with higher tensile strength and / or yield stress, or to a material with lower tensile strength and / or yield stress.

[0087] For example, when tying a reinforcing bar R using the single-wrap method in the rebar tying machine 2 (indicated as "1 wrap" in Figure 19), the diameter of the wire W (indicated as "wire diameter" in Figure 19) may be 1.6 mm or more, for example, 2.0 mm or more, for example, 2.4 mm or more, for example, 2.8 mm or more, for example, 3.2 mm or more. Note that when tying a reinforcing bar R using the single-wrap method in the rebar tying machine 2, the maximum diameter of the wire W is limited to approximately 5.0 mm. When tying a reinforcing bar R using the single-wrap method in the rebar tying machine 2, the total maximum tensile load of the wire W around the reinforcing bar R is equal to the maximum tensile load of a single wire W. If the tensile strength of the wire W is 350 MPa, the total maximum tensile load of the wire W around the reinforcing bar R may be 700 N or more, for example, 1050 N or more, for example, 1550 N or more, for example, 2150 N or more, for example, 2800 N or more. If the tensile strength of wire W is 510 MPa, the total maximum tensile load of wire W around reinforcing bar R may be 1000 N or more, for example, 1600 N or more, for example, 2300 N or more, for example, 3100 N or more, for example, 4100 N or more. In this way, by increasing the total maximum tensile load of wire W around reinforcing bar R and / or the maximum tensile load per wire W around reinforcing bar R, the wire W can be twisted with a stronger force, and the reinforcing bar R can be bound more firmly. Also, when binding reinforcing bar R in a single-wrap method with the reinforcing bar tying machine 2, the total yield point load of wire W around reinforcing bar R is equal to the yield point load of a single wire W. If the yield stress of wire W is 233 MPa, the total yield point load of wire W around reinforcing bar R may be 450 N or more, for example, 700 N or more, for example, 1050 N or more, for example, 1400 N or more, for example, 1850 N or more. If the yield strength of wire W is 279 MPa, the total yield point load of wire W around reinforcing bar R may be 550 N or more, for example 850 N or more, for example 1250 N or more, for example 1700 N or more, for example 2200 N or more. If a force exceeding the total yield point load of wire W around reinforcing bar R acts on wire W, the wire W binding reinforcing bar R will deform. When the wire W binding reinforcing bar R deforms, a gap will be created between reinforcing bar R and wire W, and the binding of reinforcing bar R will loosen.As described above, by increasing the total yield point load of the wires W around the reinforcing bar R and / or the total yield point load per wire W around the reinforcing bar R, the wires W binding the reinforcing bar R can be made less prone to deformation, and the reinforcing bar R can be bound more securely.

[0088] Furthermore, when tying the reinforcing bar R using the double-wrap method in the rebar tying machine 2 (indicated as 2 turns in Figure 19), the diameter of the wire W (indicated as wire diameter in Figure 19) may be 1.6 mm or more, for example, 2.0 mm or more, for example, 2.4 mm. Note that when tying the reinforcing bar R using the double-wrap method in the rebar tying machine 2, the maximum diameter of the wire W is limited to approximately 2.5 mm. In this case, the total maximum tensile load of the wire W around the reinforcing bar R is equal to the total maximum tensile load of the two wires W. If the tensile strength of the wire W is 350 MPa, the total maximum tensile load of the wire W around the reinforcing bar R may be 1400 N or more, for example, 2150 N or more, for example, 3150 N or more. If the tensile strength of the wire W is 510 MPa, the total maximum tensile load of the wire W around the reinforcing bar R may be 2050 N or more, for example, 3200 N or more, for example, 4600 N or more. In this way, by increasing the total maximum tensile load of the wires W around the reinforcing bar R and / or the maximum tensile load per wire W around the reinforcing bar R, it is possible to suppress the breakage of the wires W when twisting them, so that the wires W can be twisted with greater force and the reinforcing bar R can be tied more firmly. Also, when tying the reinforcing bar R using the double-wrap method in the reinforcing bar tying machine 2, the total yield point load of the wires W around the reinforcing bar R is equal to the yield point load of the two wires W. If the yield stress of the wires W is 233 MPa, the total yield point load of the wires W around the reinforcing bar R may be 900 N or more, for example 1450 N or more, for example 2100 N or more. If the yield stress of the wires W is 279 MPa, the total yield point load of the wires W around the reinforcing bar R may be 1100 N or more, for example 1750 N or more, for example 2500 N or more. If a force exceeding the total yield point load of the wires W surrounding the reinforcing bar R acts on the wires W, the wires W binding the reinforcing bar R will deform. When the wires W binding the reinforcing bar R deform, a gap is created between the reinforcing bar R and the wires W, and the binding of the reinforcing bar R becomes loose. As described above, by increasing the total yield point load of the wires W surrounding the reinforcing bar R and / or the yield point load of each individual wire W surrounding the reinforcing bar R, the wires W binding the reinforcing bar R can be made less prone to deformation, and the reinforcing bar R can be bound more securely.

[0089] In the rebar tying machine 2 of this embodiment, a bobbin 160 with a body diameter of 50 mm or more, for example 52 mm or more, for example 54 mm or more, is used as the bobbin 160 of the reel 33 shown in Figure 4. By using this configuration, it is possible to suppress the curling of the wire W caused by being wound around the bobbin 160. In the rebar tying machine 2 of this embodiment, in the guide section 40 shown in Figure 3, the distance between the tip of the upper curl guide 70 and the tip of the lower curl guide 71 is, for example, in the range of 50 mm to 80 mm. If the wire W were to develop a curling pattern due to being wound around the bobbin 160, the tip of the wire W fed out from the upper wire passage 70a of the upper curl guide 70 might not enter the lower wire passage 71a of the lower curl guide 71, making it impossible to guide the wire W around the rebar R. With the above configuration, the guide section 40 can reliably guide the tip of the wire W that has passed through the upper wire passage 70a of the upper curl guide 70 to the lower wire passage 71a of the lower curl guide 71.

[0090] In the rebar tying machine 2 of this embodiment, the biasing force of the compression spring 68 is adjusted so that the second feed gear 64 is pressed against the first feed gear 62 with a force of 60N or more, for example, 80N or more, for example, 100N or more, for example, 120N or more, for example, 140N or more, for example, 160N or more, for example, 180N, in the feed section 38 shown in Figure 4. With this configuration, even when the diameter of the wire W is large, the feeding and pulling back of the wire W can be performed reliably.

[0091] In the rebar tying machine 2 of this embodiment, the first feed gear 62 and the second feed gear 64 in the feed section 38 are made of metal with a hardness of 56 HRC or higher, for example, 58 HRC or higher, 60 HRC or higher, 62 HRC or higher, 64 HRC or higher, or 66 HRC or higher. With this configuration, even when the diameter of the wire W is large and the first feed gear 62 and the second feed gear 64 are pressed strongly against the wire W, wear of the first feed gear 62 and the second feed gear 64 can be suppressed.

[0092] In the rebar tying machine 2 of this embodiment, the feeding unit 38 uses a motor 50 with a rated output in the range of 100W to 500W, for example, in the range of 150W to 400W, as the feeding motor 50. With this configuration, even when the diameter of the wire W is large, the feeding and pulling of the wire W can be performed reliably.

[0093] In the rebar tying machine 2 of this embodiment, the upper curl guide 70 and lower curl guide 71 in the guide section 40 shown in Figure 3 are made of metal with a hardness of 56 HRC or higher, for example, 58 HRC or higher, for example, 60 HRC or higher, for example, 62 HRC, for example, 64 HRC or higher, or for example, 66 HRC or higher. By adopting this configuration, even when the diameter of the wire W is large, wear of the upper curl guide 70 and lower curl guide 71 due to contact with the wire W can be suppressed.

[0094] In the rebar tying machine 2 of this embodiment, the cutting section 44 shown in Figure 6 uses a metal with a hardness of 56 HRC or higher, for example, 58 HRC or higher, 60 HRC or higher, 62 HRC or higher, 64 HRC or higher, or 66 HRC or higher, as the material for the fixed cutter member 72 and the movable cutter member 74. With this configuration, even when the diameter of the wire W is large, wear of the fixed cutter member 72 and the movable cutter member 74 due to repeated cutting of the wire W can be suppressed.

[0095] In the rebar tying machine 2 of this embodiment, the clamp shaft 110, right clamp 112, and left clamp 114 in the twisting section 46 shown in Figure 9 are made of metal with a hardness of 56 HRC or higher, for example, 58 HRC or higher, 60 HRC or higher, 62 HRC or higher, 64 HRC or higher, or 66 HRC or higher. With this configuration, even when the diameter of the wire W is large, wear of the clamp shaft 110, right clamp 112, and left clamp 114 due to the wire W sliding against the clamp shaft 110, right clamp 112, and left clamp 114 during the feeding and pulling processes can be suppressed.

[0096] In the rebar tying machine 2 of this embodiment, the twisting section 46 uses a motor 86 with a rated output in the range of 100W to 500W, for example, in the range of 150W to 400W. With this configuration, even when the diameter of the wire W is large, the wire W can be reliably twisted and the wire W can be firmly tied.

[0097] (modified version) In the binding operation of the rebar tying machine 2 described above, the unwinding step may be omitted in both the single-wrap method and the double-wrap method.

[0098] In the rebar tying machine 2 described above, the feed motor 50 and / or torsion motor 86 may be a brushed DC motor, an AC motor, or another type of motor.

[0099] In the rebar tying machine 2 described above, the arrangement of the reel holder 10, feeding unit 38, guide unit 40, cutting unit 44, and twisting unit 46 may be different. For example, the reel holder 10 may be located on the upper rear side of the main body 4, the feeding unit 38 may be located on the upper part of the main body 4 between the reel holder 10 and the guide unit 40, and the cutting unit 44 may be located inside the main body 4 between the feeding unit 38 and the guide unit 40.

[0100] In the rebar tying machine 2 described above, the right clamp 112 and clamp shaft 110 may be configured not to hold the tip of the wire W, and the left clamp 114 and clamp shaft 110 may be configured not to hold the end of the wire W, and the tip holding step and the rear end holding step may be omitted in the tying operation of the rebar tying machine 2. In this case, in the twisting step, the wire W wound around the rebar R is twisted by being caught in the rotation of the clamp shaft 110, the right clamp 112, and the left clamp 114.

[0101] In the rebar tying machine 2 described above, instead of the battery mounting section 8 to which the battery pack B can be attached, a power cord connection section may be provided to which a power cord supplied with power from an external power source can be connected. In this case, the rebar tying machine 2 operates using power supplied via the power cord.

[0102] Instead of the user gripping the grip 6 to use the rebar tying machine 2 described above, it may be mounted on a rebar tying robot that includes a transport unit for transporting the rebar tying machine 2 and an operating unit for operating the trigger 12.

[0103] (Characteristics of the embodiment) As described above, in one or more embodiments, the rebar tying machine 2 ties the reinforcing bars R with wire W. The rebar tying machine 2 includes a bobbin 160, a reel 33 having wire W wound around the bobbin 160, a reel holder 10 (an example of a reel holder) configured to rotatably hold the reel 33, a feed unit 38 configured to feed the wire W from the reel 33 around the reinforcing bars R, and a twisting unit 46 configured to twist the wire W around the reinforcing bars R. The total maximum tensile load of the wire W around the reinforcing bars R is 1050 N or more.

[0104] To firmly bind the reinforcing bar R, it is necessary to twist the wire W around the reinforcing bar R with strong force. However, if the total maximum tensile load of the wire W around the reinforcing bar R is small, twisting the wire W with strong force may cause the wire W to break. With the above configuration, the total maximum tensile load of the wire W around the reinforcing bar R is 1050N or more, so even when the wire W around the reinforcing bar R is twisted with strong force, it is possible to suppress the breakage of the wire W. By using such a configuration, the reinforcing bar R can be bound more firmly.

[0105] In one or more embodiments, the total maximum tensile load of the wire W around the reinforcing bar R is in the range of 1050 N to 4700 N.

[0106] Generally, to increase the total maximum tensile load of the wires W around the reinforcing bar R, it is necessary to increase the number and diameter of the wires W. However, if the number and diameter of the wires W are too large, there is a risk that an excessive load will be applied to the power source (e.g., the torsion motor 86) that drives the twisted section 46. With the above configuration, it is possible to more firmly bind the reinforcing bar R while suppressing the application of an excessive load to the power source that drives the twisted section 46.

[0107] In one or more embodiments, the rebar tying machine 2 ties reinforcing bars R with wire W. The rebar tying machine 2 includes a bobbin 160, a reel 33 having wire W wound around the bobbin 160, a reel holder 10 (example of a reel holder) configured to rotatably hold the reel 33, a feed unit 38 configured to feed the wire W from the reel 33 around the reinforcing bars R, and a twisting unit 46 configured to twist the wire W around the reinforcing bars R. The total yield strength load of the wire W around the reinforcing bars R is 700 N or more.

[0108] If the wire W binding the reinforcing bar R deforms, a gap will form between the reinforcing bar R and the wire W, causing the binding of the reinforcing bar R to loosen. Therefore, in order to firmly bind the reinforcing bar R, it is necessary to make the wire W binding the reinforcing bar R resistant to deformation. However, if the total yield strength load of the wire W around the reinforcing bar R is small, there is a risk that the wire W will deform if a strong force is applied to the wire W binding the reinforcing bar R. With the above configuration, the total yield strength load of the wire W around the reinforcing bar R is 700N or more, so even if a strong force is applied to the wire W binding the reinforcing bar R, deformation of the wire W can be suppressed. By using such a configuration, the reinforcing bar R can be bound more firmly.

[0109] In one or more embodiments, the total yield point load of the wire W around the reinforcing bar R is in the range of 700 N to 2550 N.

[0110] Generally, if the total yield strength load of the wire W around the reinforcing bar R is too large, the wire W will not adhere tightly to the outer surface of the reinforcing bar R, creating a gap between the wire W and the reinforcing bar R, making it difficult to securely fasten the reinforcing bar R. The above configuration allows for a more secure fastening of the reinforcing bar R.

[0111] In one or more embodiments, the twisting section 46 includes a retaining section 90 (an example of a tip retaining section) configured to hold the end of the wire W fed out around the reinforcing bar R. The feed section 38 is configured to pull back the wire W after the retaining section 90 has held the end of the wire W but before the twisting section 46 twists the wire W.

[0112] With the above configuration, the feed section 38 pulls back the wire W, allowing the twisting section 46 to twist the wire W from a state where the wire W is in closer contact with the reinforcing bar R. This configuration allows for a stronger binding of the reinforcing bar R.

[0113] In one or more embodiments, the diameter of the wire W may be 1.6 mm or more.

[0114] According to the above configuration, the reinforcing bars R can be bound together more securely.

[0115] In one or more embodiments, the diameter of the body of the bobbin 160 is 50 mm or more.

[0116] According to the above configuration, it is possible to suppress the coiling that occurs in the wire W due to being wound on the bobbin 160.

[0117] In one or more embodiments, the feed unit 38 includes a first feed gear 62 and a second feed gear 64 (example of a feed roller) that feed out the wire W by rotation. The hardness of the first feed gear 62 and the second feed gear 64 is 56 HRC or higher.

[0118] With the above configuration, wear on the first feed gear 62 and the second feed gear 64 when the feed unit 38 feeds out the wire W can be suppressed.

[0119] In one or more embodiments, the rebar tying machine 2 further includes a cutting section 44 comprising a fixed cutter member 72 and a movable cutter member 74 (example of a cutter) for cutting the wire W. The hardness of the fixed cutter member 72 and the movable cutter member 74 is 56 HRC or higher.

[0120] With the above configuration, wear on the fixed cutter member 72 and the movable cutter member 74 can be suppressed when the cutting section 44 feeds out the wire W.

[0121] In one or more embodiments, the rebar tying machine 2 further includes a grip 6 for the user to hold. The rebar tying machine 2 allows the user to perform the rebar tying work while holding it by hand.

[0122] With the above configuration, the reinforcing bars R can be tied more securely using the handheld rebar tying machine 2.

[0123] In one or more embodiments, the rebar tying machine 2 ties reinforcing bars R with wire W. The rebar tying machine 2 includes a bobbin 160, a reel 33 having wire W wound around the bobbin 160, a reel holder 10 (example of a reel holder) configured to rotatably hold the reel 33, a feed unit 38 configured to feed the wire W from the reel 33 around the reinforcing bars R, and a twisting unit 46 configured to twist the wire W around the reinforcing bars R. The maximum tensile load per wire W around the reinforcing bars R is 700 N or more.

[0124] To firmly bind the reinforcing bars R, it is necessary to twist the wires W around the reinforcing bars R with strong force. However, if the maximum tensile load per wire W around the reinforcing bars R is small, twisting the wires W with strong force may cause the wires W to break. With the above configuration, the maximum tensile load per wire W around the reinforcing bars R is 700N or more, so even when the wires W around the reinforcing bars R are twisted with strong force, it is possible to suppress the breakage of the wires W. By using such a configuration, the reinforcing bars R can be bound more firmly.

[0125] In one or more embodiments, the rebar tying machine 2 ties reinforcing bars R with wire W. The rebar tying machine 2 includes a bobbin 160, a reel 33 having wire W wound around the bobbin 160, a reel holder 10 (example of a reel holder) configured to rotatably hold the reel 33, a feed unit 38 configured to feed the wire W from the reel 33 around the reinforcing bars R, and a twisting unit 46 configured to twist the wire W around the reinforcing bars R. The yield point load per wire W around the reinforcing bars R is 450 N or more.

[0126] If the wires W binding the reinforcing bars R deform, a gap will form between the reinforcing bars R and the wires W, causing the binding of the reinforcing bars R to loosen. Therefore, in order to firmly bind the reinforcing bars R, it is necessary to make the wires W binding them resistant to deformation. However, if the yield strength load per wire W around the reinforcing bars R is small, there is a risk that the wires W will deform when a strong force is applied to them. With the above configuration, since the yield strength load per wire W around the reinforcing bars R is 450N or more, deformation of the wires W can be suppressed even when a strong force is applied to them. By using such a configuration, the reinforcing bars R can be bound more firmly. [Explanation of symbols]

[0127] 2: Rebar tying machine 4: Main unit 6: Grip 8: Battery mounting section 10: Reel holder 12: Trigger 14: Trigger switch 15: Support part 16: Housing 16a: Window 18: Right housing 20: Left housing 22: Motor cover 24: Operation display section 24a: Main power switch 24b: Main power LED 26: Holder Housing 26a: Rotating shaft 26b: Containment space 26c: hole 28: Main cover 30: Auxiliary cover 30a: Auxiliary space 31: Torsion spring 32: Lock lever 33: Reel 36: Control circuit board 38: Sending Department 40: Information department 44: Cutting section 46: Twisted part 50: Feed motor 52: Reduction section 54: Feed Unit 56: Base component 58: Guide member 58a: Guide hole 60: Drive gear 62: First feed gear 62a: Groove 64: Second feed gear 64a: Groove 66: Release lever 66a: Oscillating axis 68: Compression spring 70: Upper curl guide 70a: Upper wire passage 71: Lower curl guide 71a: Lower wire passage 72: Fixed cutter component 72a :hole 74: Movable cutter component 74a: hole 76: First lever member 78: Second lever member 80: Link member 82: Torsion spring 86: Torsion motor 88: Reduction section 90: Holding part 92: Rotation limiting section 96: Bearing Box 96a: Bearing 98: Carrier Sleeve 98a: Clutch groove 98b: 1st wall part 98c: 2nd wall part 100: Clutch plate 100a: Clutch piece 102: Screw shaft 102a: Rear 102b: Front 102c: Flange 102d: Ball groove 102e: Engagement part 104: Inner Sleeve 104a: Ball hole 104b: Flange 106: Outer sleeve 106a: Slit 108: Push Plate 110: Clamp shaft 110a: Flat plate part 110b:Aperture 110c: Flange 110d: Hole 112: Right clamp 112a: Base section 112b: Lower protrusion 112c: Upper protrusion 112d: Contact part 112e: Upper guard section 112f: Front guard section 112g:Cam hole 112h:Cam hole 114: Left clamp 114a: Base section 114b: Pin holding part 114c: Lower protrusion 114d: Contact part 114e: Rear guard section 114f: Front guard section 114g:Cam hole 114h:Cam hole 116: Compression spring 118: Compression spring 120: Ball 122: Pin 124: Cam sleeve 126: Cam Sleeve 128: Support pin 130: Support pin 131: Cushion 132: Right-side wire passageway 134: Left wire passageway 138: Finn 138a: Short fins 138b: Long fins 140: Base component 140a: Oscillating axis 140b: Oscillating axis 142: Upper stopper 142a: Regulatory piece 144: Lower stopper 144a: Regulatory piece 146: Torsion spring 148: Torsion spring 160: Bobbin

Claims

1. A rebar tying machine that ties rebars together with wire, A bobbin, a reel having the wire wound around the bobbin, A reel holding unit configured to rotatably hold the reel, A feeding unit configured to feed the wire from the reel around the reinforcing bar, It is equipped with a twisted portion configured to twist the wire around the reinforcing bar, A rebar tying machine in which the total yield point load of the wires around the rebar is 700 N or more.

2. The rebar tying machine according to claim 1, wherein the total yield point load of the wires around the rebar is in the range of 700 N to 2550 N.

3. The twisted portion includes a tip-holding portion configured to hold the tip of the wire that has been fed out around the reinforcing bar, The rebar tying machine according to claim 1, wherein the feeding section is configured to pull back the wire after the tip holding section has held the tip of the wire, but before the twisting section twists the wire.

4. The rebar tying machine according to claim 1, wherein the diameter of the wire is 1.6 mm or more.

5. The rebar tying machine according to claim 1, wherein the diameter of the body of the bobbin is 50 mm or more.

6. The feeding unit is equipped with a feeding roller that feeds out the wire by rotation, The rebar tying machine according to claim 1, wherein the hardness of the feed roller is 56 HRC or higher.

7. The cutting section further includes a cutter for cutting the aforementioned wire, The rebar tying machine according to claim 1, wherein the hardness of the cutter is 56 HRC or higher.

8. The rebar tying machine according to claim 1, further comprising a grip for the user to grasp, enabling the user to perform the rebar tying work while holding it in their hand.

9. A rebar tying machine that ties rebars together with wire, A bobbin, a reel having the wire wound around the bobbin, A reel holding unit configured to rotatably hold the reel, A feeding unit configured to feed the wire from the reel around the reinforcing bar, It is equipped with a twisted portion configured to twist the wire around the reinforcing bar, A rebar tying machine in which the yield point load per wire around the rebar is 450 N or more.

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