Steel bar binding machine

Abstract

The present invention provides a rebar binding machine, comprising: a feeding unit for conveying a wire; a guide unit having a first wire passage through which the wire passes, the guide unit guiding the wire around the reinforcement; and a cutter for cutting the wire. The front end of the metal wire sequentially passes through the feeding unit, the cutter and the outlet of the first metal wire passage. When the binding process of binding the reinforcing steel bar with the metal wire is started, the front end of the metal wire is arranged at a first position, and the first position is closer to the outlet side of the first metal wire passage than the cutter.

Description

Technical Field

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

[0002] A steel bar tying machine is disclosed in Japanese Unexamined Patent Application Publication No. 2022-27448. The steel bar tying machine includes: a feeding unit that conveys a wire; a guiding unit that has a first wire passage through which the wire passes, and the guiding unit guides the wire around a steel bar; and a cutter that cuts the wire. The front end of the wire sequentially passes through the feeding unit, the cutter, and the outlet of the first wire passage. Summary of the Invention

[0003] Problems to be Solved by the Invention

[0004] In the above steel bar tying machine, at the start of the tying process of tying a steel bar with a wire, the front end of the wire is disposed at the cutter. Therefore, it takes time to wind the wire around the steel bar. As a result, the time for the tying process of tying a steel bar with a wire is long.

[0005] In addition, in the above steel bar tying machine, it is desired to shorten the time for the tying process.

[0006] In addition, in the above steel bar tying machine, after operating the trigger, the wire is wound around the steel bar.

[0007] In this specification, an object is to provide a technique capable of shortening the time for the tying process.

[0008] The steel bar tying machine disclosed in this specification includes: a feeding unit that conveys a wire; a guiding unit that has a first wire passage through which the wire passes, and the guiding unit guides the wire around a steel bar; and a cutter that cuts the wire. The front end of the wire sequentially passes through the feeding unit, the cutter, and the outlet of the first wire passage. At the start of the tying process of tying a steel bar with a wire, the front end of the wire is disposed at a first position, and the first position is located on the outlet side of the first wire passage with respect to the cutter.

[0009] According to the above structure, compared with the structure in which the front end of the wire is disposed at the cutter at the start of the tying process, the time required to wind the wire around the steel bar is shorter. As a result, the time for the tying process can be shortened.

[0010] The wire tying machine disclosed in this specification includes: a feeding unit that conveys a wire; a guiding unit that has a first wire passage through which the wire passes, and the guiding unit guides the wire around a steel bar; a cutter that cuts the wire; a twisting unit that twists the wire around the steel bar; a trigger that is operated by a user; and a control unit that executes an initialization process and a tying process. In the initialization process, the front end of the wire is positioned at a specified position, and in the tying process, the steel bar is tied with the wire by operating the trigger. The front end of the wire sequentially passes through the feeding unit, the cutter, and the outlet of the first wire passage. At the end of the initialization process or after the tying process and after the twisting unit returns to the initial position, the control unit controls the feeding unit to convey the front end of the wire to a first position, which is a position on the outlet side of the cutter with respect to the first wire passage.

[0011] According to the above structure, compared with the structure in which the front end of the wire is disposed at the cutter at the start of the tying process, the time required to wind the wire around the steel bar is shorter. Thereby, the time for the tying process can be shortened.

[0012] The wire tying machine disclosed in this specification includes: a feeding unit that conveys a wire; a guiding unit that guides the wire conveyed by the feeding unit to form a loop through which the steel bar can pass; a cutter that cuts the wire; a twisting unit that twists the wire around the steel bar; and a trigger that is operated by a user. The time from the start of tying the steel bar with the wire until the tying of the steel bar is completed is 0.48 seconds or less.

[0013] According to the above structure, compared with conventional wire tying machines, the time for the tying process can be shortened.

[0014] The wire tying machine disclosed in this specification includes: a feeding unit that conveys a wire; a guiding unit that guides the wire conveyed by the feeding unit to form a loop through which the steel bar can pass; a cutter that cuts the wire; a twisting unit that twists the wire around the steel bar; and a trigger that is operated by a user. Before the trigger is operated, a loop of the wire is formed. By operating the trigger, the wire around the steel bar is twisted.

[0015] According to the above structure, the user passes the steel bar through the loop of the wire before operating the trigger. Therefore, before operating the trigger, the wire has been wound around the steel bar. Thereby, the time for the tying process can be shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of the wire tying machine 2 according to the first embodiment.

[0017] Figure 2 is a left view of the state in which the reel cover 6 and the left housing 10 are removed from the wire tying machine 2 according to the first embodiment.

[0018] Figure 3 It is a cross-sectional view near the reel holding part 22 of the steel bar bundling machine 2 of the first embodiment.

[0019] Figure 4 It is a cross-sectional view near the locking lever 52 of the steel bar bundling machine 2 of the first embodiment.

[0020] Figure 5 It is a perspective view of the state after opening the reel cover 6 of the steel bar bundling machine 2 of the first embodiment.

[0021] Figure 6 It is a cross-sectional view when the reel cover 6 is in the second position in the reel cover 6 and the feeding unit 74 of the first embodiment.

[0022] Figure 7 It is a cross-sectional view near the locking lever 52 of the steel bar bundling machine 2 of the first embodiment.

[0023] Figure 8 It is a front view when the second roller 98 is in the first state in the reel cover 6 and the feeding unit 74 of the first embodiment.

[0024] Figure 9 It is a front view when the second roller 98 is in the second state in the reel cover 6 and the feeding unit 74 of the first embodiment.

[0025] Figure 10 It is a cross-sectional view when the reel cover 6 is in a position closer to the first position than the neutral position in the reel cover 6 and the feeding unit 74 of the first embodiment.

[0026] Figure 11 It is a cross-sectional view near the guide unit 76 of the steel bar bundling machines 2 of the first embodiment and the tenth embodiment.

[0027] Figure 12 It is a cross-sectional view when the front end of the cutter 128 is disposed at a position behind the wire guide hole 138 in the cutting unit 78 and the twisting unit 80 of the first embodiment.

[0028] Figure 13 It is a cross-sectional view when the front end of the cutter 128 is disposed at a position in front of the wire guide hole 138 in the cutting unit 78 and the twisting unit 80 of the first embodiment.

[0029] Figure 14 It is a perspective view of the cutting unit 78 and the twisting unit 80 of the first embodiment.

[0030] Figure 15 It is a top view of the state after opening the side plate 168 of the steel bar bundling machine 2 of the first embodiment.

[0031] Figure 16 Cross-sectional view of the side plate 168, the sliding unit 170, and the detection sensor 172 of the first embodiment.

[0032] Figure 17 Perspective view of the vicinity of the bending member 192 of the steel bar bundling machine 2 of the first embodiment.

[0033] Figure 18 Cross-sectional view of the vicinity of the bending member 192 of the steel bar bundling machine 2 of the first embodiment.

[0034] Figure 19 Flowchart showing the processing performed by the control unit 82 of the first embodiment.

[0035] Figure 20 Cross-sectional view of the vicinity of the guiding unit 76 of the steel bar bundling machine 2 of the first embodiment.

[0036] Figure 21 Flowchart showing the processing performed by the control unit 82 of the first embodiment.

[0037] Figure 22 Flowchart showing the processing performed by the control unit 82 of the first embodiment.

[0038] Figure 23 Side view of the wire W and the steel bar R after twisting the wire W in the first embodiment.

[0039] Figure 24 Perspective view of the steel bar bundling machine 2 of the second embodiment.

[0040] Figure 25 Left view of the state after removing the left housing 10 from the steel bar bundling machine 2 of the second embodiment.

[0041] Figure 26 Cross-sectional view of the vicinity of the guiding unit 76 of the steel bar bundling machine 2 of the second embodiment.

[0042] Figure 27 Front view of the steel bar bundling machine 2 of the sixth embodiment.

[0043] Figure 28 Front view of the steel bar bundling machine 2 of the seventh embodiment.

[0044] Figure 29 Front view of the state where the second roller 98 is in the first state in the reel cover 6 and the feeding unit 74 of the eighth embodiment.

[0045] Figure 30 Front view of the state where the second roller 98 is in the second state in the reel cover 6 and the feeding unit 74 of the eighth embodiment.

[0046] Figure 31 is a cross-sectional view near the guide unit 76 of the wire tying machine 2 according to the 9th and 10th embodiments.

[0047] Figure 32 is a side view of the guide unit 76 and the twisting unit 80 of the wire tying machine 2 according to the 13th and 14th embodiments. Detailed Description

[0048] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail with reference to the accompanying drawings. This detailed description is merely intended to show those skilled in the art the details of the preferred examples for implementing the present invention, and is not intended to limit the scope of the present invention. In addition, in order to provide a further improved wire tying machine, a method of manufacturing the wire tying machine, and a method of using the same, the additional features and technical solutions disclosed below can be used separately from other features and technical solutions or used together with other features and technical solutions.

[0049] Furthermore, the combination of the features and processes disclosed in the following detailed description is not essential for implementing the present invention in the broadest sense, and is only described for the purpose of specifically illustrating the representative specific examples of the present invention. And, when providing additional and useful embodiments of the present invention, the various features of the above-described and below-described representative specific examples and the various features recited in the independent claims and dependent claims do not have to be combined as in the specific examples described herein or in the recited order.

[0050] All the features recited in this specification and / or the claims are intended to be disclosed independently of the structures of the features recited in the embodiments and / or claims, as limitations of the specific matters recited in the original application disclosure and the claims, separately and independently of each other. And, the recitations related to all numerical ranges and groups or sets are intended to disclose the structures among them as limitations of the specific matters recited in the original application disclosure and the claims.

[0051] The wire tying machine disclosed in this specification includes: a feeding unit that feeds a wire; a guide unit that has a first wire passage through which the wire passes, and the guide unit guides the wire around a steel bar; and a cutter that cuts the wire. The front end of the wire sequentially passes through the feeding unit, the cutter, and the outlet of the first wire passage. At the start of the tying process of tying a steel bar with a wire, the front end of the wire is disposed at a first position that is located on the outlet side of the first wire passage relative to the cutter.

[0052] In one or more embodiments, alternatively, the guiding unit may include: a first guiding member having a first wire passageway for guiding a wire; and a second guiding member separated from the first guiding member for guiding the wire after it passes through the first wire passageway. Alternatively, the first position may be disposed in the first wire passageway.

[0053] According to the above structure, compared with the structure in which the front end of the wire is disposed at the tool at the start of the bundling process, the time required to wind the wire around the steel bar is shorter. Thus, the time for the bundling process can be made shorter.

[0054] In one or more embodiments, alternatively, the first position may be disposed at the outlet of the first wire passageway.

[0055] According to the above structure, compared with the structure in which the front end of the wire is disposed at the tool at the start of the bundling process, the time required to wind the wire around the steel bar is shorter. Thus, the time for the bundling process can be made shorter.

[0056] In one or more embodiments, alternatively, after the bundling process and after the steel bar bundler is separated from the steel bar, the feeding unit conveys the front end of the wire to the first position.

[0057] Normally, when the steel bar bundler leaves the steel bar, the user moves the steel bar bundler to another bundling position of the steel bar. At this time, the bundling process based on the steel bar bundler is not performed. According to the above structure, during the period when the steel bar bundler moves to another bundling position of the steel bar, the front end of the wire is conveyed to the first position. Thus, after the steel bar bundler moves to another bundling position of the steel bar, the steel bar bundler can immediately perform the bundling process.

[0058] In one or more embodiments, alternatively, the steel bar bundler may further include: a main body housing that supports the feeding unit and the guiding unit; a side plate that is openably and closably mounted on the main body housing and abuts against the steel bar during the bundling process; and a detection sensor that detects the opening and closing of the side plate. Alternatively, after the bundling process and when the steel bar bundler is separated from the steel bar, the side plate is opened and closed by the wire around the steel bar. Alternatively, after the detection sensor detects the opening and closing of the side plate, the feeding unit conveys the front end of the wire to the first position.

[0059] According to the above structure, it is possible to easily detect that the steel bar bundler has been separated from the steel bar.

[0060] In one or more embodiments, alternatively, the steel bar bundler may further include a trigger for the user to operate. Alternatively, when the trigger is operated during the period when the feeding unit conveys the front end of the wire to the first position, the steel bar bundler performs the bundling process.

[0061] When a user firmly binds steel bars with a wire, sometimes the user re-uses the wire to bind the binding part of the steel bars that have already been bound with the wire. In the case of a structure in which a binding process is not performed when the trigger is operated during the period when the feeding unit conveys the front end of the wire to the first position, for example, it is necessary to operate the feeding unit again after the front end of the wire is arranged at the first position by stopping the feeding unit. According to the above structure, it is not necessary to stop the feeding unit. Thus, the time required to bind the steel bars with the wire can be shortened.

[0062] In one or more embodiments, the steel bar bundling machine may further include: a trigger for the user to operate; and a pressing member that can be pressed by the steel bar. When the pressing member is pressed in a state where the trigger is operated, the steel bar bundling machine performs a bundling process.

[0063] After using the wire to bind the steel bars, the user moves the steel bar bundling machine to another bundling part of the steel bars. In the case of the above structure, during the period when the steel bar bundling machine is moved to another bundling part of the steel bars, it is possible to prevent the bundling process from being performed when the trigger is accidentally operated by the user.

[0064] In one or more embodiments, the steel bar bundling machine may further include a pressing member that can be pressed by the steel bar. It is also possible that when the pressing member is pressed, the steel bar bundling machine performs a bundling process.

[0065] In the case of the above structure, by a simple operation of pressing the steel bar against the pressing member, the steel bar bundling machine can perform a bundling process.

[0066] In one or more embodiments, the steel bar bundling machine may further include: a reel having a spool and a wire wound around the spool; and a handle portion for the user to hold. It is also possible that the reel is arranged at a position closer to the front side than the handle portion and at a position lower than the cutter.

[0067] In the case of the above structure, generally, the cutter is arranged so as to be separated from the first wire path. Therefore, compared with the structure in which the cutter is arranged in the first wire path, the time required to wind the wire around the steel bar is longer. According to the above structure, in a steel bar bundling machine in which the time required to wind the wire around the steel bar is long, the time required to wind the wire around the steel bar can be shortened. Thus, the time for the bundling process can be shortened.

[0068] In one or more embodiments, the steel bar bundling machine may further include: a reel having a spool and a wire wound around the spool; and a twisting unit that twists the wire around the steel bar. It is also possible that the reel is arranged at the rear side of the twisting unit.

[0069] In the case of the above structure, in a steel bar bundling machine where the reel is arranged at the rear side of the twisting unit, the time required to wind the wire around the steel bar can also be shortened. Thereby, the time for the bundling process can be shortened.

[0070] The steel bar bundling machine disclosed in this specification includes: a feeding unit that conveys a wire; a guiding unit that has a first wire passage through which the wire passes, and this guiding unit guides the wire around the steel bar; a cutter that cuts the wire; a twisting unit that twists the wires around the steel bar; a trigger for the user to operate; and a control unit that executes an initialization process and a bundling process. In this initialization process, the front end of the wire is positioned at a specified position. In this bundling process, the steel bar is bundled with the wire by operating the trigger. The front end of the wire sequentially passes through the feeding unit, the cutter, and the outlet of the first wire passage. At the end of the initialization process or after the bundling process and after the twisting unit returns to the initial position, the control unit controls the feeding unit to convey the front end of the wire to a first position, and this first position is located on the outlet side of the first wire passage relative to the cutter.

[0071] In one or more embodiments, it may also be that after the bundling process and after the steel bar bundling machine is separated from the steel bar, the control unit controls the feeding unit to convey the front end of the wire to the first position.

[0072] Generally, when the steel bar bundling machine leaves the steel bar, the user moves the steel bar bundling machine to another bundling position of the steel bar. At this time, the bundling process based on the control unit is not executed. According to the above structure, during the period when the steel bar bundling machine moves to another bundling position of the steel bar, the front end of the wire is conveyed to the first position. Thereby, after the steel bar bundling machine moves to another bundling position of the steel bar, the control unit can immediately execute the bundling process.

[0073] In one or more embodiments, it may also be that the steel bar bundling machine further includes: a main body housing that supports the feeding unit and the guiding unit; a side plate that is openably and closably mounted on the main body housing, and this side plate abuts against the steel bar during the bundling process; and a detection sensor that detects the opening and closing of the side plate. It may also be that after the bundling process and when the steel bar bundling machine is separated from the steel bar, the side plate is opened and closed by the wire around the steel bar. It may also be that after the detection sensor detects the opening and closing of the side plate, the control unit controls the feeding unit to convey the front end of the wire to the first position.

[0074] According to the above structure, it is possible to easily detect that the steel bar bundling machine has been separated from the steel bar.

[0075] In one or more embodiments, it may also be that when the trigger is operated during the period in which the feeding unit conveys the front end of the wire to the first position, the control unit performs a bundling process.

[0076] According to the above structure, when a user firmly bundles steel bars with a wire, the user sometimes re-uses the wire to bundle the bundling part of the steel bars that have already been bundled with the wire. In the case of a structure in which the control unit does not perform a bundling process when the trigger is operated during the period in which the feeding unit conveys the front end of the wire to the first position, for example, after the front end of the wire is disposed at the first position by stopping the feeding unit, the control unit operates the feeding unit again. According to the above structure, the control unit does not have to stop the feeding unit. Thereby, the time required to bundle steel bars with a wire can be shortened.

[0077] The steel bar bundling machine disclosed in this specification includes: a feeding unit that conveys a wire; a guiding unit that guides the wire around a steel bar; a cutting tool that cuts the wire; a twisting unit that twists the wire around the steel bar; and a trigger that is operated by a user. The time from starting to bundle steel bars with a wire until the bundling of the steel bars is completed is 0.48 seconds or less.

[0078] In one or more embodiments, it may also be that the time from starting to bundle steel bars with a wire until the bundling of the steel bars is completed is 0.40 seconds or less.

[0079] According to the above structure, compared with conventional steel bar bundling machines, the time for the bundling process can be made shorter.

[0080] In one or more embodiments, it may also be that the time from starting to bundle steel bars with a wire until the bundling of the steel bars is completed is 0.35 seconds or less.

[0081] According to the above structure, compared with conventional steel bar bundling machines, the time for the bundling process can be made shorter.

[0082] In one or more embodiments, it may also be that the time from starting to bundle steel bars with a wire until the bundling of the steel bars is completed is 0.30 seconds or less.

[0083] According to the above structure, compared with conventional steel bar bundling machines, the time for the bundling process can be made shorter.

[0084] The wire tying machine disclosed in this specification includes: a feeding unit that conveys a wire; a guiding unit that guides the wire conveyed by the feeding unit to form a loop through which a steel bar can pass; a cutter that cuts the wire; a twisting unit that twists the wire around the steel bar; and a trigger that is operated by a user. Before the trigger is operated, a loop of the wire is formed. By operating the trigger, the wire around the steel bar is twisted.

[0085] In one or more embodiments, it may also be that the twisting unit includes a gripping unit that grips the front end of the wire. It may also be that, before the trigger is operated, the front end of the wire is gripped by the gripping unit.

[0086] According to the above structure, after the trigger is operated, there is no need to use the gripping unit to grip the front end of the wire. Thus, the time for the tying process can be shortened.

[0087] In one or more embodiments, it may also be that the twisting unit includes a gripping unit that grips the front end of the wire. It may also be that, before the trigger is operated, the front end of the wire is not gripped by the gripping unit.

[0088] According to the above structure, the user can move the loop of the wire to pass the steel bar through the loop of the wire.

[0089] In one or more embodiments, it may also be that the twisting unit includes a gripping unit that grips the loop of the wire. It may also be that, before the trigger is operated, the loop of the wire is gripped by the gripping unit.

[0090] According to the above structure, after the trigger is operated, there is no need to use the gripping unit to grip the loop of the wire. Thus, the time for the tying process can be shortened.

[0091] In one or more embodiments, it may also be that the twisting unit includes a gripping unit that grips the loop of the wire. It may also be that, before the trigger is operated, the loop of the wire is not gripped by the gripping unit.

[0092] According to the above structure, the user can move the loop of the wire to pass the steel bar through the loop of the wire.

[0093] (First Embodiment)

[0094] As Figure 1As shown, the wire tying machine 2 is a hand-held device. The wire tying machine 2 uses a wire W to tie a plurality of reinforcing bars R. In the wire tying machine 2, wires W of various diameters (for example, diameters from 0.5 mm to 2.5 mm) are used corresponding to the diameter of the tied reinforcing bar R. For example, when tying a thin-diameter reinforcing bar R with a diameter of 16 mm or less (for example, a diameter of 16 mm), a wire W with a diameter of 1.6 mm or less (for example, 0.8 mm) is used, and when tying a thick-diameter reinforcing bar R with a diameter larger than 16 mm (for example, a diameter of 25 mm or 32 mm), a wire W with a diameter of 1.6 mm or more (for example, 2.0 mm) is used. Hereinafter, the length direction of the stranding unit 80 (refer to Figure 2 ) is referred to as the front-back direction, the direction orthogonal to the front-back direction is referred to as the up-down direction, and the direction orthogonal to the front-back direction and the up-down direction is referred to as the left-right direction.

[0095] The wire tying machine 2 includes a main body housing 4, a reel cover 6, and a battery pack BP. The main body housing 4 includes: a right housing 8 that defines the outer shape of the right half of the main body housing 4; and a left housing 10 that defines the outer shape of the left half of the main body housing 4.

[0096] The main body housing 4 includes a stranding unit storage portion 14, a handle portion 16, a battery mounting portion 18, a feeding unit storage portion 20, and a reel holding portion 22. The stranding unit storage portion 14, the handle portion 16, the battery mounting portion 18, the feeding unit storage portion 20, and the reel holding portion 22 are formed by the right housing 8 and the left housing 10.

[0097] As Figure 2 shown, the stranding unit storage portion 14 extends in the front-back direction. The handle portion 16 is disposed below the rear part of the stranding unit storage portion 14. The handle portion 16 is for the user to hold.

[0098] The battery mounting portion 18 is disposed below the handle portion 16. The battery pack BP is detachably mounted on the lower end of the battery mounting portion 18. The battery pack BP includes, for example, a secondary battery such as a lithium-ion battery.

[0099] The feeding unit storage portion 20 is disposed below the front part of the stranding unit storage portion 14. The feeding unit storage portion 20 is disposed in front of the handle portion 16.

[0100] The reel holding portion 22 is disposed at a position lower than the feeding unit storage portion 20. Further, in Figure 2 , the reel holding portion 22 is illustrated by a dashed line. The reel holding portion 22 is disposed at a position in front of the handle portion 16, the battery mounting portion 18, and the battery pack BP. The reel holding portion 22 is connected to the front end of the battery mounting portion 18. As Figure 3As shown, the reel holding portion 22 can accommodate a reel 24. The reel 24 includes a wire W and a reel shaft 26 around which the wire W is wound.

[0101] The reel holding portion 22 includes a base portion 30, a cylindrical portion 32, and a protruding portion 34. The base portion 30 has a reel accommodation space 36 inside. The left end of the base portion 30 is open.

[0102] The cylindrical portion 32 is disposed in the reel accommodation space 36. The cylindrical portion 32 extends leftward from the base portion 30. The cylindrical portion 32 is inserted into the reel shaft 26. By inserting the cylindrical portion 32 into the reel shaft 26, the reel 24 is accommodated in the reel accommodation space 36. The cylindrical portion 32 holds the reel 24 in such a manner that the reel 24 can rotate about a reel rotation axis AX1. The reel rotation axis AX1 extends in the left - right direction.

[0103] The protruding portion 34 protrudes downward from the lower end of the base portion 30. The protruding portion 34 is disposed outside the reel accommodation space 36. As Figure 4 shown, the protruding portion 34 includes a vertical surface 34a and an inclined surface 34b.

[0104] The vertical surface 34a is disposed on a plane including the front - rear direction and the up - down direction. The inclined surface 34b is disposed on the left side of the vertical surface 34a. The inclined surface 34b is inclined with respect to the vertical surface 34a.

[0105] As Figure 1 shown, the reel cover 6 includes a cover member 40 and an operating member 42 (see Figure 6 ). The cover member 40 is rotatably mounted on the left - hand housing 10. In this embodiment, the cover member 40 is mounted on the feed unit accommodation portion 20. The cover member 40 can rotate about a cover rotation axis AX2. By rotating the cover member 40, the reel cover 6 can be switched between a prohibited state and a permitted state (see Figure 5 ). The cover rotation axis AX2 is disposed at a position above the battery mounting portion 18 and the reel rotation axis AX1 (see Figure 2 ).

[0106] As Figure 3 shown, when the reel cover 6 is in the prohibited state, it is located at the first position. At this time, the reel accommodation space 36 is closed by the reel cover 6. Thus, it is prohibited for the reel 24 to disengage from the cylindrical portion 32, that is, it is prohibited for the reel 24 to escape from the reel accommodation space 36. In addition, when the reel cover 6 is at the first position, the cover member 40 abuts against the protruding portion 34 from the left side. Thus, it is possible to prevent the reel cover 6 from rotating beyond the first position.

[0107] As Figure 5 shown, when the reel cover 6 is in the permitted state, it is located at the second position. At this time, the reel accommodation space 36 is open. Thus, it is permitted for the reel 24 to disengage from the cylindrical portion 32 (see Figure 3) That is, it allows the reel 24 to be removed from the reel storage space 36. In addition, when the reel cover 6 is in the second position, the cover member 40 abuts against the left housing 10. Thereby, it is possible to prevent the reel cover 6 from rotating beyond the second position.

[0108] As Figure 6 shown, the operating member 42 is attached to one end of the cover member 40. The operating member 42 is disposed near the cover rotation axis AX2. The operating member 42 has a roller 44. The roller 44 is a bearing such as a needle bearing, for example. The roller 44 rotates around the cover rotation axis AX2 as the cover member 40 rotates. The roller 44 can rotate about the central axis AX3. The central axis AX3 passes through the center of the operating member 42. The central axis AX3 is substantially parallel to the cover rotation axis AX2.

[0109] As Figure 3 shown, the wire bundle tying machine 2 further includes a reel pressing member 48, a biasing member 50, a locking lever 52, and a biasing member 54 (see Figure 7 ). The reel pressing member 48 has a substantially frustoconical shape. The reel pressing member 48 is slidably attached to the cover member 40. The biasing member 50 is sandwiched between the reel pressing member 48 and the cover member 40. The biasing member 50 biases the reel pressing member 48 in a direction away from the cover member 40.

[0110] When the reel cover 6 is in the first position, a part of the reel pressing member 48 is inserted into the reel 26. The reel pressing member 48 is pressed against the left end of the reel 26 by the biasing force of the biasing member 50. As a result, the reel 26 is sandwiched between the base portion 30 and the reel pressing member 48. As a result, it is possible to prevent the reel 24 from shaking in the left-right direction when the reel 24 rotates. When the reel 24 rotates, the reel 26 slides on the outer peripheral surface of the cylindrical portion 32 and on the side surface of the reel pressing member 48.

[0111] As Figure 7 shown, the locking lever 52 is attached to the lower end of the cover member 40. The locking lever 52 has a rod main body portion 56 and an engaging portion 58.

[0112] The rod main body portion 56 can rotate about the rod rotation axis AX4. The rod main body portion 56 is for the user to operate. The biasing member 54 is sandwiched between the rear end of the rod main body portion 56 and the cover member 40. The biasing member 54 biases the rod main body portion 56 in a direction to move the rear end of the rod main body portion 56 away from the cover member 40. In addition, the distance between the cover rotation axis AX2 (see Figure 6 ) and the rod main body portion 56 is longer than the distance from the cover rotation axis AX2 to the operating member 42 (see Figure 6 ). Thereby, the force for the user to operate the reel cover 6 becomes smaller.

[0113] The engaging portion 58 is disposed at a position forward of the rod rotation axis AX4. As Figure 3As shown, the engaging portion 58 has a vertical surface 58a and an inclined surface 58b.

[0114] When the reel cover 6 is in the first position, the vertical surface 58a can engage with the vertical surface 34a of the protrusion 34. When the vertical surface 58a engages with the vertical surface 34a, rotation of the reel cover 6 from the first position to the second position can be inhibited.

[0115] The inclined surface 58b is inclined with respect to the vertical surface 58a. When the reel cover 6 is rotated from the second position to the first position, the inclined surface 58b slides on the inclined surface 34b of the protrusion 34 after abutting against the inclined surface 34b. Thereby, the locking lever 52 rotates in such a manner that the engaging portion 58 moves away from the base portion 30. When the vertical surface 58a of the engaging portion 58 moves to a position on the right side of the vertical surface 34a of the protrusion 34, the locking lever 52 rotates in such a manner that the engaging portion 58 approaches the base portion 30 under the biasing force of the biasing member 54 and returns to the initial position. Therefore, after the reel cover 6 is rotated to the first position, the engaging portion 58 can be engaged with the protrusion 34 without the user operating the locking lever 52.

[0116] As Figure 1 shown, the wire tying machine 2 further includes a main power switch 62, a display unit 64, a tying force increasing switch 66, a tying force decreasing switch 68, a trigger 70, and a trigger switch 72 (see Figure 2 ).

[0117] The main power switch 62, the display unit 64, the tying force increasing switch 66, and the tying force decreasing switch 68 are arranged at the rear of the upper surface of the main body housing 4. The main power switch 62 receives an operation by the user to switch between the on state and the off state of the wire tying machine 2. The display unit 64 displays information related to the wire tying machine 2. When the tying force increasing switch 66 is operated, the set value of the tying force of the wire tying machine 2 for the wire W is increased by one level. When the tying force decreasing switch 68 is operated, the set value of the tying force of the wire tying machine 2 for the wire W is decreased by one level. The tying force of the wire W corresponds to the force for twisting the wire W, that is, the current value of the twisting motor 146 described later.

[0118] The trigger 70 is mounted on the upper portion of the front surface of the handle portion 16 so as to be pullable. The trigger 70 is operated by the user.

[0119] As Figure 2 shown, the trigger switch 72 is housed in the handle portion 16. When the trigger 70 is pulled, the trigger switch 72 is pressed in by the trigger 70. When the wire tying machine 2 is in the on state and the trigger switch 72 is pressed in, the wire tying machine 2 ties the steel bar R using the wire W.

[0120] The wire tying machine 2 also includes a feeding unit 74, a guiding unit 76, a cutting unit 78, a twisting unit 80, and a control unit 82.

[0121] The feeding unit 74 is housed in the feeding unit housing portion 20. The feeding unit 74 is supported by the main body housing 4. As Figure 8 shown, the feeding unit 74 includes a feeding motor 88, a fixed base 90, a feeding guide 92, a transfer roller 94, a first roller 96, a second roller 98, a link member 100, and a biasing member 102 (refer to Figure 6 ).

[0122] As Figure 2 shown, the feeding motor 88 rotates by the electric power supplied from the battery pack BP. The feeding motor 88 is, for example, a brushless motor.

[0123] The fixed base 90 is fixed to the main body housing 4. As Figure 8 shown, the fixed base 90 supports the feeding motor 88.

[0124] The feeding guide 92 is fixed to the fixed base 90. The feeding guide 92 has a guide hole 92a penetrating the feeding guide 92 in the vertical direction. The wire W passes through the guide hole 92a.

[0125] The transfer roller 94 is disposed on the front side of the fixed base 90. The transfer roller 94 is fixed to the shaft of the feeding motor 88 via a speed reducer (not shown). The transfer roller 94 rotates by the rotation of the shaft of the feeding motor 88 (not shown). The transfer roller 94 has teeth 94a formed on the outer peripheral surface.

[0126] The first roller 96 is rotatably supported by the fixed base 90. The first roller 96 is disposed at a position above the cover rotation axis AX2. The first roller 96 rotates about the first roller rotation axis AX6. The first roller 96 has teeth 96a formed on the outer peripheral surface and grooves 96b recessed from the outer peripheral surface. The teeth 96a mesh with the teeth 94a of the transfer roller 94. Therefore, when the transfer roller 94 rotates, the first roller 96 rotates. The first roller 96 corresponds to the driving roller. The grooves 96b extend around the outer peripheral surface for one week.

[0127] The second roller 98 is disposed on the left side of the first roller 96. The second roller 98 is disposed at a position above the cover rotation axis AX2. The second roller 98 has teeth 98a formed on the outer peripheral surface and grooves 98b recessed from the outer peripheral surface. The teeth 98a are configured to mesh with the teeth 96a of the first roller 96. When the first roller 96 rotates while the teeth 98a and the teeth 96a are meshed, the second roller 98 rotates about the second roller rotation axis AX7. Therefore, the second roller 98 corresponds to a driven roller. The grooves 98b extend around the outer peripheral surface once. When the wire W is disposed between the first roller 96 and the second roller 98 in a state where the teeth 98a and the teeth 96a are meshed, the wire W is sandwiched between the first roller 96 and the second roller 98 within the grooves 96b and the grooves 98b. In this state, when the first roller 96 rotates in the forward direction, the wire W is pulled out from the reel 26 (refer to Figure 3 ) and sent toward the guide unit 76 (refer to Figure 2 ). Further, in this state, when the first roller 96 rotates in the reverse direction, the wire W is pulled back toward the reel 26.

[0128] As Figure 6 shown, the upper end of the link member 100 supports the second roller 98 so as to be rotatable. The link member 100 supports the second roller 98 near the second roller rotation axis AX7 of the second roller 98. The link member 100 is rotatably supported by the fixed base 90. The link member 100 rotates about the link rotation axis AX5. The link rotation axis AX5 is disposed at a position below the first roller 96 and the second roller 98 and at a position above the cover rotation axis AX2. The link member 100 rotates between the first link position and the second link position. The link rotation axis AX5 is disposed at a position below the first roller rotation axis AX6 and the second roller rotation axis AX7. As Figure 8 and Figure 9 shown, the link member 100 switches the second roller 98 between the first state and the second state by rotating between the first link position and the second link position.

[0129] As Figure 8 shown, when the second roller 98 is in the first state, it is located at the first roller position. At this time, the teeth 98a of the second roller 98 mesh with the teeth 96a of the first roller 96. Thereby, the wire W is sandwiched between the first roller 96 and the second roller 98 within the grooves 96b and the grooves 98b. Therefore, the first state corresponds to a clamping state.

[0130] As Figure 9As shown, the second roller 98 is located at the second roller position when in the second state. At this time, the distance between the first roller rotation axis AX6 and the second roller rotation axis AX7 is longer than the distance between the first roller rotation axis AX6 and the second roller rotation axis AX7 in the first state. Therefore, the distance between the first roller 96 and the second roller 98 in the second state is longer than the distance between the first roller 96 and the second roller 98 in the first state. When the second roller 98 is in the second state, the second roller 98 is separated from the first roller 96. Therefore, the teeth 98a of the second roller 98 are not engaged with the teeth 96a of the first roller 96. In this state, the wire W is not clamped between the first roller 96 and the second roller 98. Therefore, the second state corresponds to the non-clamping state. In this state, even if the first roller 96 rotates, the second roller 98 does not rotate. Thus, even if the wire W is disposed between the first roller 96 and the second roller 98, the wire W is not sent toward the guide unit 76 (refer to Figure 2 ), and is not pulled back toward the reel 26 (refer to Figure 3 ).

[0131] As Figure 6 shown, the biasing member 102 is clamped between the lower end of the link member 100 and the fixed base 90. The biasing member 102 biases the link member 100 from the second link position toward the first link position.

[0132] In the present embodiment, the link member 100 rotates between the first link position and the second link position by the operation of the drum cover 6. As Figure 8 shown, when the drum cover 6 is in the first position, the roller 44 is separated from the link member 100. Therefore, the link member 100 is in the first link position. The link member 100 is biased by the biasing member 102 (refer to Figure 6 ), whereby the second roller 98 is pressed against the first roller 96. As Figure 9 shown, when the drum cover 6 rotates from the first position to the second position, the roller 44 presses the lower end of the link member 100 into the fixed base 90. Thereby, the link member 100 rotates from the first link position to the second link position. The distance between the position where the roller 44 presses the link member 100 and the link rotation axis AX5 is longer than the distance between the link rotation axis AX5 and the second roller rotation axis AX7. Thus, compared with a structure in which the distance between the position where the roller 44 presses the link member 100 and the link rotation axis AX5 is less than the distance between the link rotation axis AX5 and the second roller rotation axis AX7, the force required to press the link member 100 becomes smaller.

[0133] As Figure 6As shown, when the reel cover 6 is located closer to the second position than the neutral position between the first position and the second position, the link member 100 is biased by the biasing member 102, and thus a force that rotates the reel cover 6 toward the second position is applied to the reel cover 6. Therefore, if the reel cover 6 exceeds the neutral position when the reel cover 6 is rotated from the first position to the second position, the reel cover 6 will automatically rotate toward the second position even if the user's hand leaves the reel cover 6. Further, the reel cover 6 is maintained at the second position by the biasing of the biasing member 102. When the reel cover 6 is located at the neutral position, the plane CP connecting the cover rotation axis AX2 and the central axis AX3 coincides with the neutral plane NP including the front-rear direction and the left-right direction. Further, as Figure 10 shown, when the reel cover 6 is located closer to the first position than the neutral position, the link member 100 is biased by the biasing member 102, and thus a force that rotates the reel cover 6 toward the first position is applied to the reel cover 6. Therefore, if the reel cover 6 exceeds the neutral position when the reel cover 6 is rotated from the second position to the first position, the reel cover 6 will automatically rotate toward the first position even if the user's hand leaves the reel cover 6.

[0134] When replacing the reel 24, as Figure 5 shown, the user holds the reel cover 6 with a hand, and after pressing the locking lever 52 with the hand holding the reel cover 6, the user rotates the reel cover 6 from the first position to the second position. As Figure 6 shown, the roller 44 presses into the lower end of the link member 100, and thus the link member 100 rotates from the first link position to the second link position. As Figure 9 shown, the second roller 98 rotates from the first roller position to the second roller position, and thus the state is switched from the first state to the second state. Next, the user withdraws the wire W from between the first roller 96 and the second roller 98. Next, as Figure 3 shown, after the user removes the reel 24 from the cylindrical portion 32, the user installs a new reel 24 on the cylindrical portion 32. Next, as Figure 9 shown, the user inserts the wire W between the first roller 96 and the second roller 98. Finally, the user rotates the reel cover 6 from the second position to the first position. As Figure 8 shown, the roller 44 separates from the lower end of the link member 100, and thus the link member 100 rotates from the second link position to the first link position. The second roller 98 rotates from the second roller position to the first roller position, and thus the state is switched from the second state to the first state. As a result, the wire W is sandwiched between the first roller 96 and the second roller 98.

[0135] As Figure 11As shown, the guiding unit 76 is supported by the main body housing 4. The guiding unit 76 includes a first guiding member 110, a second guiding member 112, a first pin 114, a second pin 115, and a wire guide 116. The first guiding member 110 and the second guiding member 112 are fixed to the front end of the stranded unit accommodating portion 14. The first guiding member 110 and the second guiding member 112 extend forward from the front end of the stranded unit accommodating portion 14. The first guiding member 110 opens downward. The first guiding member 110 has a first wire passage 120, and the first wire passage 120 has a curved shape that bulges upward. The second guiding member 112 is disposed below the first guiding member 110 in a separated manner from the first guiding member 110. The reinforcing bar R is disposed between the first guiding member 110 and the second guiding member 112 during bundling. The second guiding member 112 opens upward. The second guiding member 112 has a second wire passage 122.

[0136] The first pin 114 and the second pin 115 are fixed to the first guiding member 110. A part of the first pin 114 and the second pin 115 are disposed in the first wire passage 120. The first pin 114 is disposed near the outlet 120a of the first wire passage 120. The second pin 115 is disposed near the inlet 120b of the first wire passage 120.

[0137] The wire guide 116 is fixed to the second guiding member 112. The wire guide 116 is disposed between the feeding unit 74 and the first guiding member 110. The wire guide 116 has a guiding hole 116a.

[0138] The wire W conveyed by the feeding unit 74 is conveyed to the inlet 120b of the first wire passage 120 after passing through the guiding hole 116a of the wire guide 116. The wire W is guided by the first guiding member 110 and passes through the inside of the first wire passage 120 from the rear to the front. When the wire W passes through the inside of the first wire passage 120, it abuts against the first pin 114 and the second pin 115. Thereby, a downward winding tendency is imparted to the wire W. The wire W is conveyed to the inlet 122a of the wire passage 122 after passing through the outlet 120a of the first wire passage 120. The wire W is guided by the second guiding member 112 and passes through the inside of the second wire passage 122 from the front to the rear. After that, the wire W moves upward to the rear after passing through the outlet 122b of the second wire passage 122. By forming a loop RP of the wire W, the wire W is wound around the reinforcing bar R. The reinforcing bar R penetrates the loop RP in the left-right direction.

[0139] As Figure 2As shown, the cutting unit 78 is housed in the stranding unit housing portion 14. The cutting unit 78 is supported by the main body housing 4. The cutting unit 78 is disposed between the feeding unit 74 and the first guiding member 110. The cutting unit 78 is disposed at a position above the feeding unit 74 and the reel 24. As Figure 12 shown, the cutting unit 78 includes a tool guide 126, a tool 128, a push rod 130, a support shaft 132 (refer to Figure 14 ), and a biasing member 134 (refer to Figure 14 ).

[0140] The tool guide 126 is fixed to the stranding unit housing portion 14 (refer to Figure 2 ). The tool guide 126 has a tool guide hole 136 and a wire guide hole 138. The tool guide hole 136 penetrates the tool guide 126 in the front-rear direction. As Figure 11 shown, the wire guide hole 138 is connected near the front end of the tool guide hole 136. The wire guide hole 138 penetrates the tool guide 126 in the vertical direction. The wire guide hole 138 faces the guide hole 116a of the wire guide member 116. The wire guide hole 138 is disposed between the guide hole 116a and the inlet 120b of the first wire passage 120. Accordingly, the wire W passing through the guide hole 116a is conveyed to the inlet 120b of the first wire passage 120 after passing through the wire guide hole 138.

[0141] As Figure 12 shown, the tool 128 extends in the front-rear direction. The front portion of the tool 128 is inserted into the tool guide hole 136. The tool 128 is supported by the tool guide 126 so as to be slidable in the front-rear direction.

[0142] The push rod 130 is disposed at the rear side of the tool guide 126. The push rod 130 is fixed to the tool 128. The push rod 130 includes a first rod portion 140 and a second rod portion 142. The first rod portion 140 is located at the front end of the push rod 130. As Figure 13 shown, when the first rod portion 140 is pushed forward by the stranding unit 80, the push rod 130 approaches the tool guide 126. Thereby, the tool 128 slides to a position in front of the wire guide hole 138. As a result, the wire W is cut by the tool 128 and the tool guide 126.

[0143] The second rod portion 142 is located at the rear end of the push rod 130. When the second rod portion 142 is pushed rearward by the stranding unit 80, the push rod 130 separates from the tool guide 126.

[0144] As Figure 14As shown, the support shaft 132 extends in the front-rear direction. The support shaft 132 and the tool 128 are arranged in the left-right direction. The rear end of the support shaft 132 is fixed to the push rod 130. The front portion of the support shaft 132 is slidably supported by the tool guide 126. The support shaft 132 inhibits the rotation of the push rod 130.

[0145] The biasing member 134 is sandwiched between the tool guide 126 and the push rod 130. The support shaft 132 is inserted into the biasing member 134. The biasing member 134 biases the push rod 130 rearward toward the initial position.

[0146] As Figure 2 shown, the stranding unit 80 is received in the stranding unit receiving portion 14. The stranding unit 80 is supported by the main body housing 4. The stranding unit 80 is disposed above the cutting unit 78. In the up-down direction, the stranding unit 80 is disposed between the first guide member 110 and the second guide member 112. As Figure 14 shown, the stranding unit 80 includes a stranding motor 146, a speed reducer 148, a screw shaft 150, a sleeve unit 152, a push plate 154, and a gripping unit 156.

[0147] The stranding motor 146 is, for example, a brushless motor. The stranding motor 146 rotates about the central axis AX8 by the power supplied from the battery pack BP. The central axis AX8 extends in the front-rear direction. The speed reducer 148 includes a planetary gear mechanism. The rotation of the stranding motor 146 is transmitted to the screw shaft 150 via the speed reducer 148. Thus, the screw shaft 150 rotates about the central axis AX8.

[0148] The screw shaft 150 is inserted into the sleeve unit 152. When the screw shaft 150 rotates, the sleeve unit 152 moves in the front-rear direction or rotates about the central axis AX8 in cooperation with a rotation restricting mechanism (not shown).

[0149] The push plate 154 is rotatably supported by the sleeve unit 152. The push plate 154 has a substantially flat plate shape. The push plate 154 moves in the front-rear direction together with the sleeve unit 152. When the push plate 154 moves forward, it pushes the first rod portion 140 forward. In addition, when the push plate 154 moves rearward, it pushes the second rod portion 142 rearward. Even when the sleeve unit 152 rotates, the push plate 154 does not rotate.

[0150] The gripping unit 156 projects forward from the front portion of the sleeve unit 152. The gripping unit 156 is disposed at a position rearward of the reinforcing bar R (see Figure 11 ). The gripping unit 156 includes a clamp shaft 160, a right clamp 162, and a left clamp 164.

[0151] The clamp shaft 160 is inserted into the sleeve unit 152 from the front side. The clamp shaft 160 is disposed on the central axis AX8.

[0152] The right clamp 162 is mounted on the clamp shaft 160 in such a way as to penetrate the clamp shaft 160 from the right side to the left side. The right clamp 162 can move in the left - right direction relative to the clamp shaft 160. The right clamp 162 is arranged at the right - most position relative to the clamp shaft 160 in the initial state. At this time, a right wire passage 165 is formed between the right clamp 162 and the clamp shaft 160. The wire W can pass through the right wire passage 165. When the sleeve unit 152 moves forward from this state, the right clamp 162 moves leftward relative to the clamp shaft 160. Thereby, the end of the wire W is clamped between the right clamp 162 and the clamp shaft 160.

[0153] The left clamp 164 is mounted on the clamp shaft 160 in such a way as to penetrate the clamp shaft 160 from the left side to the right side. The left clamp 164 can move in the left - right direction relative to the clamp shaft 160. The left clamp 164 is arranged at the left - most position relative to the clamp shaft 160 in the initial state. At this time, a left wire passage 166 is formed between the left clamp 164 and the clamp shaft 160. The wire W can pass through the left wire passage 166. When the sleeve unit 152 moves forward from this state, the left clamp 164 moves rightward relative to the clamp shaft 160. Thereby, the end of the wire W is clamped between the left clamp 164 and the clamp shaft 160.

[0154] When the sleeve unit 152 rotates while one end and the other end of the wire W are held by the holding unit 156, the holding unit 156 rotates around the central axis AX8. The wire W is twisted, and thereby the steel bar R (refer to Figure 2 ) is bundled by the wire W.

[0155] As Figure 2 shown, the control unit 82 is housed in the battery mounting portion 18. The control unit 82 includes an MCU (not shown) and a switching element (not shown). The control unit 82 is electrically connected to the main power switch 62 (refer to Figure 1 ), the display unit 64 (refer to Figure 1 ), the bundling force increasing switch 66 (refer to Figure 1 ), the bundling force decreasing switch 68 (refer to Figure 1 ), the trigger switch 72, the feeding motor 88, the twisting motor 146, and the battery pack BP.

[0156] As Figure 15 shown, the steel bar bundling machine 2 includes a pair of side plates 168, a pair of sliding units 170, and a pair of detection sensors 172 (refer to Figure 16 ). For one side plate 168, one sliding unit 170 and one detection sensor 172 are provided.

[0157] A pair of side plates 168 are installed at the front end of the stranding unit storage part 14. When bundling the steel bars R with the wire W, the pair of side plates 168 are pressed against the steel bars R. One side plate 168 is openably and closably installed on the right housing 8. The other side plate 168 is openably and closably installed on the left housing 10. As Figure 2 shown, the side plate 168 is normally closed under the biasing force of the biasing member 174. The gripping unit 156 is disposed at a position rearward of the side plate 168.

[0158] The sliding unit 170 and the detection sensor 172 are disposed inside the stranding unit storage part 14. The sliding unit 170 and the detection sensor 172 are disposed above the stranding unit 80. As Figure 16 shown, the sliding unit 170 includes a sliding plate 178, a magnet holding member 180, a magnet 182, and a biasing member 184.

[0159] The sliding plate 178 extends in the front-rear direction. The sliding plate 178 is supported by the stranding unit storage part 14 so as to be slidable in the front-rear direction (refer to Figure 2 ). The sliding plate 178 abuts against the side plate 168 from the rear side.

[0160] The magnet holding member 180 is fixed to the rear end of the sliding plate 178. The magnet holding member 180 holds the magnet 182. The magnet 182 is, for example, a permanent magnet. The magnet holding member 180 is biased forward by the biasing member 184. Thus, the sliding plate 178 is pressed against the side plate 168.

[0161] The detection sensor 172 is electrically connected to the control unit 82 (refer to Figure 2 ). The detection sensor 172 includes a sensor substrate 186 and a sensor element 188. The sensor substrate 186 is fixed to the stranding unit storage part 14 (refer to Figure 2 ). The sensor element 188 is mounted on the sensor substrate 186. The sensor element 188 is a magnetic sensor element. When the side plate 168 is closed, the sensor element 188 faces the magnet 182. On the other hand, when the side plate 168 is opened, the sensor element 188 does not face the magnet 182. In addition, in Figure 16 , the magnet holding member 180 and the magnet 182 when the side plate 168 is opened are shown by dashed lines. By detecting the magnetic change of the magnet 182 by the sensor element 188, the detection sensor 172 detects the opening and closing of the side plate 168.

[0162] As Figure 17As shown, the wire bundling machine 2 further includes a bending member 192. The bending member 192 is housed in the stranding unit housing portion 14. The bending member 192 has a plate shape. The bending member 192 is arranged along a plane including the front-back direction and the up-down direction. The bending member 192 is made of a metal material, for example. The bending member 192 is independent of the stranding unit 80. The bending member 192 is fixed to the second guide member 112. Therefore, the bending member 192 cannot move relative to the main body housing 4. The left surface of the bending member 192 delimits a part of the second wire passage 122 of the second guide member 112. The bending member 192 is arranged near the wire guide hole 138. The bending member 192 is arranged at a position to the left of the wire guide hole 138. The bending member 192 is arranged at a position to the right of the second wire passage 122. Therefore, in the left-right direction, the bending member 192 is arranged between the wire guide hole 138 and the second wire passage 122.

[0163] The bending member 192 has an abutting surface 194. The abutting surface 194 is formed on a part of the upper surface of the bending member 192. The abutting surface 194 connects the right surface and the left surface of the bending member 192. The width of the abutting surface 194 in the left-right direction gradually increases from the rear end of the abutting surface 194 toward the inflection point position and is constant between the inflection point position and the front end of the abutting surface 194. The width of the abutting surface 194 in the left-right direction becomes narrower as it goes upward. The abutting surface 194 extends from the upper left end of the bending member 192 toward the lower right. The abutting surface 194 faces the upper right.

[0164] As Figure 18 shown, the abutting surface 194 is arranged at a position in front of (on the side of the steel bar R) the cutting tool 128. The abutting surface 194 is arranged at a position above the wire guide hole 138 and below the gripping unit 156. Therefore, in the up-down direction, the abutting surface 194 is arranged between the wire guide hole 138 and the gripping unit 156. When observing the wire bundling machine 2 in a direction orthogonal to the central axis AX8, the abutting surface 194 is inclined with respect to the central axis AX8. The abutting surface 194 moves away from the central axis AX8 as it goes from the rear end to the front end. The front end of the abutting surface 194 is farther from the central axis AX8 than the rear end of the abutting surface 194. The abutting surface 194 is curved.

[0165] After the reel 24 is installed in the reel holding portion 22, when the main power switch 62 is operated for the first time (refer to Figure 1 ), Figure 2 as shown, the control unit 82 executes Figure 19 the process shown.

[0166] As Figure 19As shown, in S2, the control unit 82 performs initialization processing. Specifically, the control unit 82 repeatedly executes a feeding process and a cutting-off process. In the feeding process, the control unit 82 rotates the feeding motor 88 forward by a specified number of rotations. By rotating the first roller 96 forward, the wire W is fed toward the guiding unit 76. In the cutting-off process, the control unit 82 rotates the stranding motor 146 forward by a specified number of rotations, and then rotates the stranding motor 146 backward by a specified number of rotations. First, when the sleeve unit 152 moves forward, the push plate 154 pushes the first rod portion 140 forward. As a result, the push rod 130 moves forward, and the cutter 128 slides to a position in front of the wire guiding hole 138. Next, when the sleeve unit 152 moves backward, the push rod 130 is urged backward by the urging member 134 and returns to the initial position. When the control unit 82 determines that the current value of the stranding motor 146 has decreased after reaching a specified value or more during the execution of the cutting-off process, the control unit 82 ends the initialization process after the completion of this cutting-off process. The situation where the current value of the stranding motor 146 has decreased after reaching a specified value or more corresponds to the wire W having been cut by the cutter 128. At the end of the initialization process, the front end W1 of the wire W is disposed within the wire guiding hole 138.

[0167] In S4, the control unit 82 performs a pre-feeding process for the wire. Specifically, the control unit 82 rotates the feeding motor 88 forward by a reference number of rotations. As Figure 20 shown, by rotating the first roller 96 forward, the front end W1 of the wire W is fed out from the wire guiding hole 138 to the first position. The first position is disposed on the outlet 120a side of the first wire passage 120, which is closer to the outlet 120a than the wire guiding hole 138 and the cutter 128. The first position is disposed within the first wire passage 120. The first position is disposed at the outlet 120a of the first wire passage 120. The first position is not disposed on the inlet 122a side of the second wire passage 122, which is closer to the outlet 120a of the first wire passage 120.

[0168] In S6, the control unit 82 sets the number of rotations of the feeding motor 88 in the winding process described later to the first number of rotations. When the feeding motor 88 rotates forward by the first number of rotations, the first roller 96 rotates forward, and thereby the front end W1 of the wire W is fed out from the first position to the left wire passage 166.

[0169] In addition, after the control unit 82 executes the Figure 19 processing shown, the control unit 82 executes the Figure 21 and Figure 22 processing shown.

[0170] As Figure 21As shown, in S20, the control unit 82 determines whether the trigger 70 is pulled. When the control unit 82 determines that the trigger 70 has been pulled (Yes in S20), it proceeds to S22.

[0171] In S22, the control unit 82 determines whether it is the first time the trigger 70 has been pulled after the initialization process. When the control unit 82 determines that it is the first time the trigger 70 has been pulled after the initialization process (Yes in S22), it proceeds to Figure 22 S30. On the other hand, when the control unit 82 determines that it is not the first time the trigger 70 has been pulled after the initialization process (No in S22), it proceeds to S24.

[0172] S24 corresponds to the processes executed the second time and later after the initialization process Figure 21 and Figure 22 In S24, the control unit 82 determines whether the side plate 168 has been opened and closed during the processes of Figure 21 and Figure 22 executed the last time. When the control unit 82 determines that the side plate 168 has been opened and closed (Yes in S24), it proceeds to Figure 22 S30. On the other hand, when the control unit 82 determines that the side plate 168 has not been opened and closed (No in S24), it proceeds to S26.

[0173] In S26, the control unit 82 rotates the stranding motor 146 in the reverse direction, thereby returning the stranding unit 80 to the initial position. After that, it proceeds to Figure 22 S30.

[0174] As Figure 22 shown, in S30, the control unit 82 performs the bundling process. Specifically, the bundling process includes a winding process, a first gripping process, a pulling-back process, a second gripping process, a cutting process, a stranding process, a bending process, and a wire releasing process.

[0175] (Winding process)

[0176] The control unit 82 rotates the feeding motor 88 in the forward direction. As a result, as Figure 11 shown, the first roller 96 rotates in the forward direction, so that the front end W1 of the wire W sequentially passes through the wire guiding hole 138, the right wire passage 165, the first wire passage 120, the second wire passage 122, and the left wire passage 166. By forming a loop RP of the wire W, the wire W is wound around the steel bar R. At this time, the steel bar R penetrates the loop RP in the left - right direction. In addition, when the wire W passes through the first wire passage 120, it abuts against the first pin 114 and the second pin 115, thereby imparting a winding tendency to the wire W.

[0177] (First gripping process)

[0178] The first gripping process is performed after the winding process. When the time to start the bundling process is set to 0 seconds, the first gripping process is performed 0.10 seconds later. The control unit 82 rotates the stranding motor 146 in the forward direction. By Figure 14 the shown sleeve unit 152 moves forward, so that the left clamp 164 moves to the right relative to the clamp shaft 160. As a result, the left wire passage 166 becomes narrower, and the front end W1 of the wire W is clamped between the left clamp 164 and the clamp shaft 160. As a result, the front end W1 of the wire W is gripped by the gripping unit 156.

[0179] (Pull-back process)

[0180] The pull-back process is performed after the first gripping process. The pull-back process is performed 0.17 seconds after the start of the bundling process. The control unit 82 rotates the feed motor 88 in the reverse direction. As Figure 11 shown, by rotating the first roller 96 in the reverse direction, the wire W is pulled back toward the reel 26. As a result, the loop RP of the wire W is reduced in diameter and contacts the steel bar R. In addition, in Figure 11 the reduced-diameter wire W is shown by a dotted line.

[0181] (Second gripping process)

[0182] The second gripping process is performed after the pull-back process. The second gripping process is performed 0.24 seconds after the start of the bundling process. The control unit 82 rotates the stranding motor 146 in the forward direction. By Figure 14 the shown sleeve unit 152 moves forward, so that the right clamp 162 moves to the left relative to the clamp shaft 160. As a result, the right wire passage 165 becomes narrower, and the wire W is clamped between the right clamp 162 and the clamp shaft 160 at the position between the wire guide hole 138 and the first wire passage 120. As a result, the wire W is gripped by the gripping unit 156 at two places.

[0183] (Cutting process)

[0184] The cutting process is performed after the second gripping process. The cutting process is performed 0.27 seconds after the start of the bundling process. The control unit 82 rotates the stranding motor 146 further in the forward direction. As Figure 13 shown, by the sleeve unit 152 moving further forward, the push plate 154 pushes the first rod portion 140 forward. As a result, the cutting tool 128 slides to a position in front of the wire guide hole 138. As a result, the wire W is cut by the cutting tool 128 and the tool guide 126 at the position between the wire guide hole 138 and the right wire passage 165. Hereinafter, the end portion of the wire W formed by the cutting tool 128 cutting the wire W is sometimes referred to as the end W2 of the wire W.

[0185] (Stranding process, bending process)

[0186] The stranding process is performed after the cutting process. The stranding process is performed 0.31 seconds after the start of the bundling process. The bending process is performed during the execution of the stranding process. The control unit 82 further rotates the stranding motor 146 in the forward direction. Rotation is performed through the sleeve unit 152 and the gripping unit 156, thereby stranding the wire W. Thus, the wire W is used to bundle the reinforcing bar R. As Figure 18 shown, when stranding the wire W, the end W2 of the wire W slides on the abutment surface 194 after abutting against the abutment surface 194. Thus, the end W2 of the wire W is bent toward the reinforcing bar R. In Figure 18 , the end W2 of the bent wire W is shown by a dashed line, and the wire W is exaggeratedly shown. As Figure 23 shown, the ear height L1 representing the maximum distance between the reinforcing bar R and the end W2 of the wire W is shorter than the ear height L2 when the end W2 of the wire W is not bent.

[0187] (Wire release process)

[0188] The wire release process is performed after the stranding process. The wire release process is performed 0.41 seconds after the start of the bundling process. The control unit 82 rotates the stranding motor 146 in the reverse direction. By moving rearward through the sleeve unit 152, the right clamp 162 moves to the right relative to the clamp shaft 160, and the left clamp 164 moves to the left relative to the clamp shaft 160. Thus, the front end W1 and the end W2 of the wire W are no longer held by the gripping unit 156. The wire release process is completed 0.48 seconds after the start of the bundling process.

[0189] As Figure 22 shown, in S32, the control unit 82 determines whether the side plate 168 has been opened and closed. As Figure 15 shown, after completing the bundling of the reinforcing bar R, the user moves the reinforcing bar bundler 2 away from the reinforcing bar R. At this time, the side plate 168 is opened by bringing the front end W1 and the end W2 of the wire W into contact with the side plate 168, and then the front end W1 and the end W2 of the wire W are separated from the side plate 168, whereby the side plate 168 is closed. When the sensor element 188 of the detection sensor 172 detects a change in the magnetism of the magnet 182, the control unit 82 determines that the side plate 168 has been opened and closed. When the control unit 82 determines that the side plate 168 has not been opened and closed within the specified period ("No" in S32), it proceeds to S34. On the other hand, when the control unit 82 determines that the side plate 168 has been opened and closed ("Yes" in S32), it proceeds to S36.

[0190] In S34, the control unit 82 sets the number of rotations of the feed motor 88 in the subsequent winding process to the second number of rotations. The second number of rotations is greater than the first number of rotations. When the feed motor 88 rotates forward by the second number of rotations, the first roller 96 rotates forward, whereby the front end W1 of the wire W is fed out from the wire guide hole 138 to the left wire passage 166. Thereafter, the control unit 82 returns to S20.

[0191] In S36, the control unit 82 rotates the stranding motor 146 in the reverse direction, whereby the stranding unit 80 is returned to the initial position.

[0192] In S38, the control unit 82 performs a wire pre-feed process. As a result, the front end W1 of the wire W is fed out to the first position, that is, the outlet 120a of the first wire passage 120.

[0193] In S40, the control unit 82 determines whether the trigger 70 is pulled during the execution of the wire pre-feed process. When the control unit 82 determines that the trigger 70 is not pulled during the execution of the wire pre-feed process ("No" in S40), it proceeds to S42. On the other hand, when the control unit 82 determines that the trigger 70 is pulled during the execution of the wire pre-feed process ("Yes" in S40), it proceeds to S44.

[0194] In S42, the control unit 82 sets the number of rotations of the feed motor 88 to the first number of rotations. Thereafter, the control unit 82 returns to S20.

[0195] In S44, the control unit 82 sets the number of rotations of the feed motor 88 to the first number of rotations. Thereafter, the control unit 82 returns to S30. The control unit 82 performs the processes of S44 and S30 substantially simultaneously. As a result, after the process of S38, the wire W is wound around the reinforcing bar R without stopping the feed motor 88.

[0196] (Effect)

[0197] The reinforcing bar tying machine 2 of the present embodiment includes: a feed unit 74 that conveys a wire W; a guide unit 76 that has a first wire passage 120 through which the wire W passes, and the guide unit 76 guides the wire W around the reinforcing bar R; and a cutter 128 that cuts the wire W. The front end W1 of the wire W sequentially passes through the feed unit 74, the cutter 128, and the outlet 120a of the first wire passage 120. At the start of the tying process of tying the reinforcing bar R with the wire W, the front end W1 of the wire W is disposed at the first position, which is a position on the outlet 120a side of the first wire passage 120 relative to the cutter 128.

[0198] According to the above structure, compared with the structure in which the front end W1 of the wire W is disposed at the cutter 128 at the start of the bundling process, the time required to wind the wire W around the steel bar R is shorter. Thus, the time for the bundling process can be shortened.

[0199] In addition, the guiding unit 76 includes: a first guiding member 110 having a first wire passage 120, the first guiding member 110 guiding the wire W; and a second guiding member 112 separated from the first guiding member 110, the second guiding member 112 guiding the wire W after passing through the first wire passage 120. The first position is disposed in the first wire passage 120.

[0200] According to the above structure, compared with the structure in which the front end W1 of the wire W is disposed at the cutter 128 at the start of the bundling process, the time required to wind the wire W around the steel bar R is shorter. Thus, the time for the bundling process can be made shorter.

[0201] In addition, the first position is disposed at the outlet 120a of the first wire passage 120.

[0202] According to the above structure, compared with the structure in which the front end W1 of the wire W is disposed at the cutter 128 at the start of the bundling process, the time required to wind the wire W around the steel bar R is shorter. Thus, the time for the bundling process can be made shorter.

[0203] In addition, after the bundling process and after the steel bar bundler 2 is separated from the steel bar R, the feeding unit 74 conveys the front end W1 of the wire W to the first position.

[0204] Normally, when the steel bar bundler 2 leaves the steel bar R, the user moves the steel bar bundler 2 to another bundling position of the steel bar R. At this time, the bundling process based on the steel bar bundler 2 is not performed. According to the above structure, during the period when the steel bar bundler 2 moves to another bundling position of the steel bar R, the front end W1 of the wire W is conveyed to the first position. Thus, after the steel bar bundler 2 moves to another bundling position of the steel bar R, the steel bar bundler 2 can immediately perform the bundling process.

[0205] In addition, the steel bar bundler 2 further includes: a main body housing 4 that supports the feeding unit 74 and the guiding unit 76; a side plate 168 that is openably and closably mounted on the main body housing 4, the side plate 168 abutting against the steel bar R during the bundling process; and a detection sensor 172 that detects the opening and closing of the side plate 168. After the bundling process and when the steel bar bundler 2 is separated from the steel bar R, the side plate 168 is opened and closed by the wire W around the steel bar R. After the detection sensor 172 detects the opening and closing of the side plate 168, the feeding unit 74 conveys the front end W1 of the wire W to the first position.

[0206] According to the above structure, it is possible to easily detect that the wire tying machine 2 has been separated from the reinforcing bar R.

[0207] In addition, the wire tying machine 2 is also provided with a trigger 70 for the user to operate. When the trigger 70 is operated during the period when the feeding unit 74 conveys the front end W1 of the wire W to the first position, the wire tying machine 2 performs a tying process.

[0208] When the user firmly ties the reinforcing bar R with the wire W, the user sometimes uses the wire W again to tie the tied portion of the reinforcing bar R that has already been tied with the wire W. In the case of a structure where the tying process is not performed when the trigger 70 is operated during the period when the feeding unit 74 conveys the front end W1 of the wire W to the first position, for example, it is necessary to make the feeding unit 74 operate again after the front end W1 of the wire W is arranged at the first position by stopping the feeding unit 74. According to the above structure, it is not necessary to stop the feeding unit 74. Thus, the time required to tie the reinforcing bar R with the wire W can be shortened.

[0209] In addition, the wire tying machine 2 includes: a reel 24 having a spool 26 and a wire W wound around the spool 26; and a handle portion 16 for the user to hold. The reel 24 is arranged at a position forward of the handle portion 16 and at a position below the cutter 128.

[0210] In the case of the above structure, usually, the cutter 128 is arranged so as to be separated from the first wire passage 120. Therefore, compared with the structure where the cutter 128 is arranged in the first wire passage 120, the time required to wind the wire W around the reinforcing bar R is longer. According to the above structure, in the wire tying machine 2 where the time required to wind the wire W around the reinforcing bar R is long, the time required to wind the wire W around the reinforcing bar R can be shortened. Thus, the time for the tying process can be shortened.

[0211] The wire tying machine 2 of this embodiment includes: a feeding unit 74 that conveys the wire W; a guiding unit 76 that has a first wire passage 120 through which the wire W passes, and the guiding unit 76 guides the wire W around the reinforcing bar R; a cutter 128 that cuts the wire W; a twisting unit 80 that twists the wire W around the reinforcing bar R; a trigger 70 for the user to operate; and a control unit 82 that performs an initialization process and a tying process. In the initialization process, the front end W1 of the wire W is positioned at a specified position. In the tying process, the reinforcing bar R is tied with the wire W by operating the trigger 70. The front end W1 of the wire W sequentially passes through the feeding unit 74, the cutter 128, and the outlet 120a of the first wire passage 120. At the end of the initialization process or after the tying process and after the twisting unit 80 returns to the initial position, the control unit 82 controls the feeding unit 74 to convey the front end W1 of the wire W to a first position, which is a position on the outlet 120a side of the first wire passage 120 closer to the cutter 128.

[0212] According to the above structure, compared with the structure in which the front end W1 of the wire W is arranged at the cutter 128 at the start of the tying process, the time required to wind the wire W around the reinforcing bar R is shorter. Thus, the time of the tying process can be shortened.

[0213] In addition, after the tying process and after the wire tying machine 2 is separated from the reinforcing bar R, the control unit 82 controls the feeding unit 74 to convey the front end W1 of the wire W to the first position.

[0214] Normally, when the wire tying machine 2 leaves the reinforcing bar R, the user moves the wire tying machine 2 to another tying position of the reinforcing bar R. At this time, the tying process based on the control unit 82 is not executed. According to the above structure, during the period when the wire tying machine 2 moves to another tying position of the reinforcing bar R, the front end W1 of the wire W is conveyed to the first position. Thus, after the wire tying machine 2 moves to another tying position of the reinforcing bar R, the control unit 82 can immediately execute the tying process.

[0215] In addition, the wire tying machine 2 further includes: a main body housing 4 that supports the feeding unit 74 and the guiding unit 76; a side plate 168 that is openably and closably installed on the main body housing 4, and the side plate 168 abuts against the reinforcing bar R during the tying process; and a detection sensor 172 that detects the opening and closing of the side plate 168. After the tying process and when the wire tying machine 2 is separated from the reinforcing bar R, the side plate 168 is opened and closed by the wire W around the reinforcing bar R. After the detection sensor 172 detects the opening and closing of the side plate 168, the control unit 82 controls the feeding unit 74 to convey the front end W1 of the wire W to the first position.

[0216] According to the above structure, it is possible to easily detect that the wire tying machine 2 has been separated from the reinforcing bar R.

[0217] In addition, when the trigger 70 is operated while the feeding unit 74 feeds the front end W1 of the wire W to the first position, the control unit 82 performs a bundling process.

[0218] When a user firmly bundles the reinforcing bar R with the wire W, the user sometimes re-uses the wire W to bundle the bundling portion of the reinforcing bar R that has already been bundled with the wire W. In the case of a configuration where the control unit 82 does not perform a bundling process when the trigger 70 is operated while the feeding unit 74 feeds the front end W1 of the wire W to the first position, for example, after the front end W1 of the wire W is disposed at the first position by stopping the feeding unit 74, the control unit 82 causes the feeding unit 74 to operate again. According to the above configuration, the control unit 82 does not have to stop the feeding unit 74. As a result, the time required to bundle the reinforcing bar R with the wire W can be shortened.

[0219] The reinforcing bar bundling machine 2 of the present embodiment includes a feeding unit 74 that feeds the wire W, a guiding unit 76 that guides the wire W around the reinforcing bar R, a cutter 128 that cuts the wire W, a twisting unit 80 that twists the wire W around the reinforcing bar R, and a trigger 70 for the user to operate. The time from starting to bundle the reinforcing bar R with the wire W until completing the bundling of the reinforcing bar R is 0.48 seconds or less.

[0220] According to the above configuration, compared with the conventional reinforcing bar bundling machine 2, the time for the bundling process can be shortened.

[0221] (Second Embodiment)

[0222] In the second embodiment, the differences from the first embodiment will be described. As Figure 24 shown, the shape of the reinforcing bar bundling machine 2 of the second embodiment is different from the shape of the reinforcing bar bundling machine 2 of the first embodiment.

[0223] As Figure 25 shown, the control unit 82 is housed in the twisting unit housing portion 14. In addition, in Figure 25 , the reel cover 6 is opened. The control unit 82 is disposed below the twisting unit 80. The cutting unit 78 is disposed at a position above the twisting unit 80. The handle portion 16 is disposed below the twisting unit housing portion 14. The battery mounting portion 18 is disposed below the handle portion 16. The feeding unit housing portion 20 is disposed on the right side of the twisting unit housing portion 14 and above the handle portion 16. The reel holding portion 22 is disposed behind the twisting unit housing portion 14 and the feeding unit housing portion 20 and above the handle portion 16. The reel 24 is disposed behind the feeding unit 74, the guiding unit 76, the cutting unit 78, and the twisting unit 80. The feeding unit 74 feeds the wire W pulled out from the reel 26 forward.

[0224] As Figure 26 shown, the cutting unit 78 includes a link member 226, a fixed cutter 228, and a movable cutter 230. The link member 226 operates the movable cutter 230 as the stranding unit 80 (see Figure 25 ) operates.

[0225] The fixed cutter 228 is fixed to the first guide member 110. The fixed cutter 228 is disposed in the first wire passage 120. The fixed cutter 228 has a first wire guide hole 234. The first wire guide hole 234 is a through hole. The wire W passes through the first wire guide hole 234.

[0226] The movable cutter 230 is supported by the fixed cutter 228. The fixed cutter 228 is inserted into the movable cutter 230. A part of the movable cutter 230 is disposed in the first wire passage 120. The movable cutter 230 is connected to the link member 226. The movable cutter 230 rotates around the fixed cutter 228 by the operation of the link member 226. Thus, the wire W is cut by the fixed cutter 228 and the movable cutter 230. The front end W1 of the wire W formed by cutting the wire W is disposed in the first wire passage 120. When the wire pre-feeding process is performed by the control unit 82, the front end W1 of the wire W is sent out from the first wire guide hole 234 to the outlet 120a of the first wire passage 120.

[0227] (Effect)

[0228] In the present embodiment, the steel bar tying machine 2 further includes: a reel 24 having a reel 26 and a wire W wound around the reel 26; and a stranding unit 80 that strands the wire W around the steel bar R. The reel 24 is disposed behind the stranding unit 80.

[0229] In the case of the above-described structure, in the steel bar tying machine 2 in which the reel 24 is disposed behind the stranding unit 80, it is also possible to shorten the time required to wind the wire W around the steel bar R. Thus, the tying process time can be shortened.

[0230] (Third Embodiment)

[0231] In the third embodiment, the differences from the first embodiment will be described. The start times of the respective processes of the tying process in the third embodiment are different from the start times of the respective processes of the tying process in the first embodiment. The control unit 82 operates the feeding motor 88 at a speed higher than the speed of the feeding motor 88 in the first embodiment. In addition, the control unit 82 operates the stranding motor 146 at a speed higher than the speed of the stranding motor 146 in the first embodiment.

[0232] The first gripping process is performed 0.09 seconds after the start of the bundling process. The retracting process is performed 0.14 seconds after the start of the bundling process. The second gripping process is performed 0.20 seconds after the start of the bundling process. The cutting process is performed 0.23 seconds after the start of the bundling process. The twisting process is performed 0.26 seconds after the start of the bundling process. The wire releasing process is performed 0.34 seconds after the start of the bundling process. The wire releasing process is completed 0.40 seconds after the start of the bundling process.

[0233] (Effect)

[0234] In this embodiment, the time from the start of bundling the steel bar R with the wire W until the completion of bundling the steel bar R is 0.40 seconds or less.

[0235] According to the above structure, compared with the conventional steel bar bundling machine 2, the bundling process time can be made shorter.

[0236] (Fourth Embodiment)

[0237] In the fourth embodiment, the differences from the first embodiment will be described. The start times of the respective processes of the bundling process in the fourth embodiment are different from the start times of the respective processes of the bundling process in the first embodiment. The control unit 82 operates the feeding motor 88 at a speed higher than the rotational speed of the feeding motor 88 in the first embodiment. In addition, the control unit 82 operates the twisting motor 146 at a speed higher than the rotational speed of the twisting motor 146 in the first embodiment.

[0238] The first gripping process is performed 0.08 seconds after the start of the bundling process. The retracting process is performed 0.13 seconds after the start of the bundling process. The second gripping process is performed 0.18 seconds after the start of the bundling process. The cutting process is performed 0.20 seconds after the start of the bundling process. The twisting process is performed 0.23 seconds after the start of the bundling process. The wire releasing process is performed 0.30 seconds after the start of the bundling process. The wire releasing process is completed 0.35 seconds after the start of the bundling process.

[0239] (Effect)

[0240] In this embodiment, the time from the start of bundling the steel bar R with the wire W until the completion of bundling the steel bar R is 0.35 seconds or less.

[0241] According to the above structure, compared with the conventional steel bar bundling machine 2, the bundling process time can be made shorter.

[0242] (Fifth Embodiment)

[0243] In the fifth embodiment, the differences from the first embodiment will be described. The start times of the respective processes of the bundling process in the fifth embodiment are different from the start times of the respective processes of the bundling process in the first embodiment. The control unit 82 operates the feed motor 88 at a speed higher than the rotational speed of the feed motor 88 in the first embodiment. In addition, the control unit 82 operates the stranding motor 146 at a speed higher than the rotational speed of the stranding motor 146 in the first embodiment.

[0244] The first gripping process is executed 0.06 seconds after the start of the bundling process. The pulling-back process is executed 0.11 seconds after the start of the bundling process. The second gripping process is executed 0.15 seconds after the start of the bundling process. The cutting process is executed 0.17 seconds after the start of the bundling process. The stranding process is executed 0.19 seconds after the start of the bundling process. The wire release process is executed 0.26 seconds after the start of the bundling process. The wire release process is completed 0.30 seconds after the start of the bundling process.

[0245] (Effect)

[0246] In this embodiment, the time from the start of bundling the steel bars with the wire to the completion of bundling the steel bars is 0.30 seconds or less.

[0247] According to the above structure, compared with the conventional steel bar bundling machine, the time for the bundling process can be made shorter.

[0248] (Sixth embodiment)

[0249] In the sixth embodiment, the differences from the first embodiment will be described. As Figure 27 shown, the arrangement of the bending member 192 in the sixth embodiment is different from the arrangement of the bending member 192 in the first embodiment.

[0250] The bending member 192 is arranged on the right side of the gripping unit 156. The bending member 192 is fixed to the main body housing 4. The abutting surface 194 is formed on a part of the upper surface of the bending member 192.

[0251] In a modification of the sixth embodiment, as Figure 27 shown by the dashed line in, the bending member 192 can be arranged on the left side of the gripping unit 156. In the case of this structure, the abutting surface 194 can be formed on a part of the lower surface of the bending member 192.

[0252] In another modification of the sixth embodiment, as Figure 27 shown by the dashed line in, the bending member 192 can be arranged above the gripping unit 156. In the case of this structure, the abutting surface 194 can be formed on a part of the lower surface of the bending member 192.

[0253] (Seventh embodiment)

[0254] In the seventh embodiment, the differences from the first embodiment will be described. As Figure 28 shown, the shape of the bending member 192 in the seventh embodiment is different from the shape of the bending member 192 in the first embodiment.

[0255] The bending member 192 has a cylindrical shape. The bending member 192 is fixed to the main body housing 4. The bending member 192 surrounds the gripping unit 156. The contact surface 194 is formed at a part of the inner peripheral surface of the bending member 192.

[0256] (Eighth Embodiment)

[0257] In the eighth embodiment, the differences from the first embodiment will be described. As Figure 29 shown, the feeding unit 74 includes a sliding member 300, a support member 302, a biasing member 304, and an operating member 306.

[0258] The sliding member 300 is slidably supported by the support member 302.

[0259] The support member 302 is fixed to the fixed base 90.

[0260] The biasing member 304 is sandwiched between the lower end of the link member 100 and the sliding member 300. The biasing member 304 biases the sliding member 300 in a direction away from the link member 100.

[0261] One end of the operating member 306 is connected to the operating member 42 of the reel cover 6. The other end of the operating member 306 is connected to the sliding member 300. By rotating the reel cover 6 between the first position and the second position, the operating member 306 slides the sliding member 300.

[0262] When the reel cover 6 is in the first position, the sliding member 300 is disposed at the first sliding position. When the reel cover 6 is in the first position, the second roller 98 is in the first state. As Figure 30As shown, when the bobbin cover 6 rotates from the first position to the second position, the sliding member 300 slides from the first sliding position in a direction away from the lower end of the link member 100 to the second sliding position by the operation of the operating member 306. When the bobbin cover 6 rotates from the first position to the second position, the second roller 98 switches from the first pressing state to the second pressing state. Even when the bobbin cover 6 rotates from the first position to the second position, the position of the link member 100 does not change. The distance between the sliding member 300 disposed at the second sliding position and the lower end of the link member 100 is longer than the distance between the sliding member 300 disposed at the first sliding position and the lower end of the link member 100. The biasing force of the biasing member 304 when the sliding member 300 is disposed at the second sliding position is smaller than the biasing force of the biasing member 304 when the sliding member 300 is disposed at the first sliding position. The force pressing the second roller 98 in the second pressing state against the first roller 96 is smaller than the force pressing the second roller 98 in the first pressing state against the first roller 96. Thus, the force for clamping the wire W between the first roller 96 and the second roller 98 in the second pressing state is smaller than the force for clamping the wire W between the first roller 96 and the second roller 98 in the first pressing state. Therefore, when the second roller 98 is in the second pressing state, the wire W can be more easily inserted between the first roller 96 and the second roller 98 than when the second roller 98 is in the first pressing state.

[0263] As Figure 29 shown, when the bobbin cover 6 rotates from the second position to the first position, the sliding member 300 slides from the second sliding position in a direction approaching the lower end of the link member 100 to the first sliding position by the operation of the operating member 306. Thereby, the second roller 98 switches from the second pressing state to the first pressing state.

[0264] (The 9th Embodiment)

[0265] In the 9th embodiment, the differences from the 1st embodiment will be described. As Figure 31 shown, the wire tying machine 2 further includes a pressing member 400. The pressing member 400 is swingably supported by the main body housing 4. The pressing member 400 is disposed near the first guide member 110. The pressing member 400 can be pressed by the reinforcing bar R when the reinforcing bar R (refer to Figure 11 ) is disposed between the first guide member 110 and the second guide member 112.

[0266] When the pressing member 400 is pressed by the reinforcing bar R in a state where the trigger 70 (refer to Figure 2 ) is depressed, the control unit 82 (refer to Figure 2 ) executes Figure 22 the bundling process of S30.

[0267] (Effect)

[0268] In this embodiment, the wire tying machine 2 further includes a trigger 70 for the user to operate and a pressing member 400 that can be pressed by the reinforcing bar R. When the pressing member 400 is pressed in a state where the trigger 70 is operated, the wire tying machine 2 performs a tying process.

[0269] After tying the reinforcing bar R with the wire W, the user moves the wire tying machine 2 to another tying position of the reinforcing bar R. In the case of the above structure, during the period of moving the wire tying machine 2 to another tying position of the reinforcing bar R, it is possible to suppress the execution of the tying process when the trigger 70 is accidentally operated by the user.

[0270] (Embodiment 10)

[0271] In Embodiment 10, the differences from Embodiment 9 will be described. In Embodiment 10, the wire tying machine 2 does not include a trigger 70 (refer to Figure 2 ). When the pressing member 400 is pressed by the reinforcing bar R, the control unit 82 (refer to Figure 2 ) executes Figure 22 the tying process of S30.

[0272] (Effect)

[0273] In this embodiment, the wire tying machine 2 further includes a pressing member 400 that can be pressed by the reinforcing bar R. When the pressing member 400 is pressed, the wire tying machine 2 performs a tying process.

[0274] In the case of the above structure, by a simple operation of pressing the reinforcing bar R against the pressing member 400, the wire tying machine 2 can be made to perform a tying process.

[0275] (Embodiment 11)

[0276] In Embodiment 11, the differences from Embodiment 1 will be described. In Embodiment 11, in Figure 19 S4 of Figure 22 and the wire pre-feeding process of S38 in Figure 11 , the control unit 82 first rotates the feeding motor 88 in the forward direction for the second number of rotations. As a result, as shown in Figure 14 , the front end W1 of the wire W is sent out to the left wire passage 166. The first position is arranged in the left wire passage 166. Thus, a loop RP of the wire W is formed. Next, the control unit 82 rotates the twisting motor 146 in the forward direction. By moving the sleeve unit 152 forward as shown in

[0277] , the left clamp 164 moves to the right relative to the clamp shaft 160. As a result, the left wire passage 166 becomes narrower, and the front end W1 of the wire W is clamped between the left clamp 164 and the clamp shaft 160. As a result, the front end W1 of the wire W is held by the holding unit 156.As Figure 11 shown, when the user binds the reinforcing bar R with the wire W, first, before pulling the trigger 70, the user passes the reinforcing bar R through the loop RP of the wire W. Next, the user pulls the trigger 70 (refer to Figure 2 ). Thereby, the control unit 82 executes the binding process of S30 in Figure 22 . Specifically, the binding process includes a pulling-back process, a second gripping process, a cutting process, a twisting process, a bending process, and a wire releasing process. Since the loop RP of the wire W is formed and the front end W1 of the wire W is gripped by the gripping unit 156, the binding process does not include a winding process and a first gripping process.

[0278] (Effect)

[0279] The reinforcing bar binding machine 2 of the present embodiment includes: a feeding unit 74 that feeds the wire W; a guiding unit 76 that guides the wire W fed by the feeding unit 74 to form a loop RP through which the reinforcing bar R can pass; a cutter 128 that cuts the wire W; a twisting unit 80 that twists the wire W around the reinforcing bar R; and a trigger 70 that is operated by the user. Before operating the trigger 70, the loop RP of the wire W is formed. By operating the trigger 70, the wire W around the reinforcing bar R is twisted.

[0280] According to the above structure, the user passes the reinforcing bar R through the loop RP of the wire W before operating the trigger 70. Therefore, before operating the trigger 70, the wire W has been wound around the reinforcing bar R. Thereby, the time for the binding process can be shortened.

[0281] In addition, the twisting unit 80 includes a gripping unit 156 that grips the front end W1 of the wire W. Before the trigger 70 is operated, the front end W1 of the wire W is gripped by the gripping unit 156.

[0282] According to the above structure, after operating the trigger 70, it is not necessary to use the gripping unit 156 to grip the front end W1 of the wire W. Thereby, the time for the binding process can be shortened.

[0283] (12th Embodiment)

[0284] In the 12th embodiment, the differences from the 1st embodiment are described. In the 12th embodiment, in the wire pre-feeding process of S4 in Figure 19 and S38 in Figure 22 , the control unit 82 first rotates the feeding motor 88 in the forward direction for the second number of rotations. Thereby, as Figure 11 shown, the front end W1 of the wire W is fed out to the left wire passage 166. The first position is arranged in the left wire passage 166. Thereby, the loop RP of the wire W is formed.

[0285] When the user uses the wire W to tie the reinforcing bar R, first, before pulling the trigger 70, with the front end W1 of the wire W not being held by the holding unit 156, the user passes the reinforcing bar R through the loop RP of the wire W. Next, the user pulls the trigger 70 (refer to Figure 2 ). Thereby, the control unit 82 executes the Figure 22 bundling process of S30. Specifically, the bundling process includes a first holding process, a retracting process, a second holding process, a cutting process, a twisting process, a bending process, and a wire releasing process. Since the loop RP of the wire W is formed, the bundling process does not include a winding process.

[0286] (Effect)

[0287] In this embodiment, the twisting unit 80 includes a holding unit 156 that holds the front end W1 of the wire W. Before operating the trigger 70, the front end W1 of the wire W is not held by the holding unit 156.

[0288] According to the above structure, the user can move the loop RP of the wire W to pass the reinforcing bar R through the loop RP of the wire W.

[0289] (The 13th embodiment)

[0290] In the 13th embodiment, the differences from the 2nd embodiment will be described. As Figure 32 shown, the holding unit 156 includes a hook 500. The hook 500 protrudes forward from the front part of the sleeve unit 152. The hook 500 opens and closes corresponding to the movement of the sleeve unit 152 in the front-rear direction. When the sleeve unit 152 moves forward, the hook 500 closes to hold the loop RP of the wire W. When the sleeve unit 152 moves backward, the hook 500 opens to release the loop RP of the wire W.

[0291] In the 13th embodiment, in the Figure 19 S4 and the Figure 22 wire pre-feeding process of S38, the control unit 82 first rotates the feeding motor 88 in the forward direction for the second number of rotations. Thereby, as Figure 32 shown, after the front end W1 of the wire W passes through the first wire passage 120, it passes through the second wire passage 122, and then passes through the first wire passage 120 again. Thereby, the loop RP of the wire W is formed. Next, the control unit 82 rotates the twisting motor 146 in the forward direction. By moving the sleeve unit 152 forward, the hook 500 closes. Thereby, the loop RP of the wire W is held by the hook 500.

[0292] When the user uses the wire W to tie the reinforcing bar R, before pulling the trigger 70, first the user passes the reinforcing bar R through the loop RP of the wire W. Next, the user pulls the trigger 70 (refer to Figure 25)。Thus, the control unit 82 executes Figure 22 the bundling process of S30. Specifically, the bundling process includes a cutting process, a twisting process, a bending process, and a wire releasing process. Since the loop RP of the wire W is formed and the loop RP of the wire W is held by the hook 500, the bundling process does not include a winding process, a first holding process, a pulling-back process, and a second holding process.

[0293] In the wire releasing process, the control unit 82 rotates the twisting motor 146 in the reverse direction. The hook 500 is opened by the rearward movement of the sleeve unit 152. Thus, the loop RP of the wire W is released from the hook 500. Since the cutting process, the twisting process, and the bending process have been described in the first embodiment, the description of the cutting process, the twisting process, and the bending process is omitted.

[0294] (Effect)

[0295] In this embodiment, the twisting unit 80 includes a holding unit 156 that holds the loop RP of the wire W. Before the trigger 70 is operated, the loop RP of the wire W has been held by the holding unit 156.

[0296] According to the above structure, after the trigger 70 is operated, it is not necessary to use the holding unit 156 to hold the loop RP of the wire W. Thus, the time for the bundling process can be shortened.

[0297] (The 14th embodiment)

[0298] In the 14th embodiment, the differences from the 13th embodiment are described. In the 14th embodiment, in Figure 19 S4 of Figure 22 and in the wire pre-feeding process of S38 of Figure 32 , the control unit 82 rotates the feeding motor 88 in the forward direction for the second number of rotations. Thus, as

[0299] shown, the front end W1 of the wire W passes through the first wire passage 120 and then through the second wire passage 122, and then passes through the first wire passage 120 again. Thus, the loop RP of the wire W is formed.

[0299] When the user uses the wire W to bundle the steel bar R, first, before pulling the trigger 70, the steel bar R is passed through the loop RP of the wire W in a state where the loop RP of the wire W is not held by the hook 500. Next, the user pulls the trigger 70 (refer to Figure 25 ). Thus, the control unit 82 executes Figure 22 the bundling process of S30. Specifically, the bundling process includes a holding process, a cutting process, a twisting process, a bending process, and a wire releasing process. Since the loop RP of the wire W is formed, the bundling process does not include a winding process.

[0300] In the gripping process, the control unit 82 rotates the stranding motor 146 in the forward direction. By moving the sleeve unit 152 forward, the hook 500 closes. As a result, the loop RP of the wire W is gripped by the hook 500.

[0301] (Effect)

[0302] In the present embodiment, the stranding unit 80 includes a gripping unit 156 that grips the loop RP of the wire W. Before operating the trigger 70, the loop RP of the wire W is not gripped by the gripping unit 156.

[0303] According to the above structure, the user can move the loop RP of the wire W to pass the reinforcing bar R through the loop RP of the wire W.

[0304] (Modification)

[0305] In one embodiment, the reinforcing bar bundling machine 2 may be a device that autonomously moves on the reinforcing bar R.

[0306] In one embodiment, the first position may be arranged between the cutting tool 128 and the first wire passage 120.

[0307] In one embodiment, the bending member 192 may be fixed to the main body housing 4.

[0308] In one embodiment, the abutting surface 194 may not be bent.

[0309] In one embodiment, the bending member 192 may not define the second wire passage 122.

[0310] In one embodiment, after performing the cutting process and before performing the stranding process, the bending member 192 may bend the end W2 of the wire W toward the reinforcing bar R.

[0311] In one embodiment, the link member 100 may support the first roller 96 so as to be rotatable. In the case of this structure, the first roller 96 corresponds to the "second roller", and the second roller 98 corresponds to the "first roller".

[0312] In one embodiment, when the second roller 98 is in the second state, the teeth 98a of the second roller 98 mesh with the teeth 96a of the first roller 96. In the case of this structure, the distance between the first roller 96 and the second roller 98 is longer than the distance between the first roller 96 and the second roller 98 in the first state. In addition, the wire W is sandwiched between the first roller 96 and the second roller 98. The force for clamping the wire W between the first roller 96 and the second roller 98 in the second state is weaker than the force for clamping the wire W between the first roller 96 and the second roller 98 in the first state.

[0313] In one embodiment, it may also be that the reel holding portion 22 does not have a reel storage space 36. In the case of this structure, when the reel cover 6 is in the prohibited state, a part of the reel 24 is exposed.

[0314] In one embodiment, it may also be that the operating member 42 has a non-rotatable abutting portion. In the case of this structure, the abutting portion presses into the lower end of the link member 100.

[0315] In one embodiment, it may also be that the locking lever 52 is installed on the reel holding portion 22.

[0316] It may also be that the steel bar bundling machine 2 of the second to eighth embodiments and the eleventh to fourteenth embodiments includes the pressing member 400 of the ninth embodiment. In the case of this structure, it may also be that when the pressing member 400 is pressed by the steel bar R in the state where the trigger 70 (refer to Figure 2 ) is pressed, the control unit 82 executes Figure 22 the bundling process of S30. Additionally, it may also be that when the pressing member 400 is pressed by the steel bar R, the control unit 82 executes Figure 22 the bundling process of S30.

Claims

1. A wire tying machine for steel bars, wherein, the wire tying machine for steel bars includes: a feeding unit that conveys a wire; a guiding unit that has a first wire passage through which the wire passes, and the guiding unit guides the wire around the steel bar; and a cutter that cuts the wire, the front end of the wire sequentially passes through the feeding unit, the cutter, and the outlet of the first wire passage, at the start of the tying process of tying the steel bar with the wire, the front end of the wire is disposed at a first position, and the first position is located on the outlet side of the first wire passage relative to the cutter.

2. The wire tying machine for steel bars according to claim 1, wherein, the guiding unit includes: a first guiding member that has the first wire passage and guides the wire; and a second guiding member that is separated from the first guiding member and guides the wire after passing through the first wire passage, the first position is disposed in the first wire passage.

3. The wire tying machine for steel bars according to claim 2, wherein, the first position is disposed at the outlet of the first wire passage.

4. The wire tying machine for steel bars according to any one of claims 1 to 3, wherein, after the tying process and after the wire tying machine is separated from the steel bar, the feeding unit conveys the front end of the wire to the first position.

5. The wire tying machine for steel bars according to claim 4, wherein, the wire tying machine for steel bars further includes: a main body housing that supports the feeding unit and the guiding unit; a side plate that is openably and closably mounted on the main body housing, and the side plate abuts against the steel bar during the tying process; and a detection sensor that detects the opening and closing of the side plate, when the wire tying machine is separated from the steel bar after the tying process, the side plate is opened and closed by the wire around the steel bar, after the detection sensor detects the opening and closing of the side plate, the feeding unit conveys the front end of the wire to the first position.

6. The wire tying machine for steel bars according to any one of claims 1 to 5, wherein, the wire tying machine for steel bars further includes a trigger for the user to operate, when the trigger is operated during the period when the feeding unit conveys the front end of the wire to the first position, the wire tying machine performs the tying process.

7. The wire tying machine for steel bars according to any one of claims 1 to 5, wherein, the wire tying machine for steel bars further includes: a trigger for the user to operate; and a pressing member that can be pressed by the steel bar, when the pressing member is pressed in the state where the trigger is operated, the wire tying machine performs the tying process.

8. The wire tying machine for steel bars according to any one of claims 1 to 5, wherein, the wire tying machine for steel bars further includes a pressing member that can be pressed by the steel bar, when the pressing member is pressed, the wire tying machine performs the tying process.

9. The wire tying machine for steel bars according to any one of claims 1 to 8, wherein, the wire tying machine for steel bars further includes: A reel having a spool and a wire wound around the spool; and A handle portion for a user to hold, The reel is disposed at a position forward of the handle portion and at a position below the cutter.

10. The steel bar bundling machine according to any one of claims 1 to 8, wherein The steel bar bundling machine further includes: A reel having a spool and a wire wound around the spool; and A twisting unit that twists the wire around the steel bar, The reel is disposed at the rear side of the twisting unit.

11. A steel bar bundling machine, wherein The steel bar bundling machine includes: A feeding unit that feeds a wire; A guiding unit having a first wire passage through which the wire passes, and the guiding unit guides the wire around the steel bar; A cutter that cuts the wire; A twisting unit that twists the wire around the steel bar; A trigger for a user to operate; and A control unit that performs an initialization process and a bundling process. In the initialization process, the front end of the wire is positioned at a specified position. In the bundling process, the wire is used to bundle the steel bar by operating the trigger, The front end of the wire sequentially passes through the feeding unit, the cutter, and the outlet of the first wire passage, At the end of the initialization process or after the bundling process and after the twisting unit returns to the initial position, the control unit controls the feeding unit to convey the front end of the wire to a first position, which is a position on the outlet side of the first wire passage relative to the cutter.

12. The steel bar bundling machine according to claim 11, wherein After the bundling process and after the steel bar bundling machine is separated from the steel bar, the control unit controls the feeding unit to convey the front end of the wire to the first position.

13. The steel bar bundling machine according to claim 12, wherein The steel bar bundling machine further includes: A main body housing that supports the feeding unit and the guiding unit; A side plate that is openably and closably mounted on the main body housing, and the side plate abuts against the steel bar during the bundling process; and A detection sensor that detects the opening and closing of the side plate, After the bundling process and when the steel bar bundling machine is separated from the steel bar, the side plate is opened and closed by the wire around the steel bar, After the detection sensor detects the opening and closing of the side plate, the control unit controls the feeding unit to convey the front end of the wire to the first position.

14. The steel bar bundling machine according to any one of claims 11 to 13, wherein When the trigger is operated during the period when the feeding unit conveys the front end of the wire to the first position, the control unit performs the bundling process.

15. A steel bar bundling machine, wherein The steel bar bundling machine includes: A feeding unit that feeds a wire; A guiding unit that guides the wire around the steel bar; A cutter that cuts the wire; A twisting unit that twists the wire around the steel bar; and A trigger for user operation, The time from starting to use the wire to bind the steel bar until the binding of the steel bar is completed is 0.48 seconds or less.

16. The steel bar binding machine according to claim 15, wherein, The time from starting to use the wire to bind the steel bar until the binding of the steel bar is completed is 0.40 seconds or less.

17. The steel bar binding machine according to claim 16, wherein, The time from starting to use the wire to bind the steel bar until the binding of the steel bar is completed is 0.35 seconds or less.

18. The steel bar binding machine according to claim 17, wherein, The time from starting to use the wire to bind the steel bar until the binding of the steel bar is completed is 0.30 seconds or less.

19. A steel bar binding machine, wherein, The steel bar binding machine includes: A feeding unit for conveying a wire; A guiding unit for guiding the wire conveyed by the feeding unit to form a loop through which the steel bar can pass through; A cutter for cutting the wire; A twisting unit for twisting the wire around the steel bar; and A trigger for user operation, Before the trigger is operated, the loop of the wire is formed, By operating the trigger, the wire around the steel bar is twisted.

20. The steel bar binding machine according to claim 19, wherein, The twisting unit includes a holding unit for holding the front end of the wire, Before operating the trigger, the front end of the wire is held by the holding unit.

21. The steel bar binding machine according to claim 19, wherein, The twisting unit includes a holding unit for holding the front end of the wire, Before operating the trigger, the front end of the wire is not held by the holding unit.

22. The steel bar binding machine according to claim 19, wherein, The twisting unit includes a holding unit for holding the loop of the wire, Before operating the trigger, the loop of the wire is held by the holding unit.

23. The steel bar binding machine according to claim 19, wherein, The twisting unit includes a holding unit for holding the loop of the wire, Before operating the trigger, the loop of the wire is not held by the holding unit.

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