Steel bar binding machine

Abstract

The invention provides a reinforcing steel bar binding machine, which is provided with a reel holding part for holding a reel; a reel stopper capable of switching between a prohibited state in which the reel is prohibited from being disengaged and a permitted state in which the reel is permitted to be disengaged; a first roller that is rotatable; a second roller capable of rotating, the second roller being capable of switching between a first state in which the wire is sandwiched between the first roller and the second roller and a second state in which the distance between the first roller and the second roller is longer than the distance between the first roller and the second roller in the first state; and a twisting unit that twists the metal wires. When the reel stopper is switched from the prohibited state to the allowed state, the second roller is switched from the first state to the second state.

Description

Technical Field

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

[0002] A steel bar bundling machine is disclosed in International Publication No. 2021 / 070481. The steel bar bundling machine includes: a reel holding part that holds a reel having a wire so as to be rotatable about a reel rotation axis; a reel stopper that can be switched between a prohibited state in which the reel is prohibited from detaching from the reel holding part and a permitted state in which the reel is permitted to detach from the reel holding part; a first roller that can rotate; a second roller that can rotate, and the second roller can be switched between a first state in which the wire is sandwiched between the first roller and the second roller and a second state in which the distance between the first roller and the second roller is longer than the distance between the first roller and the second roller in the first state; an operation part that can move between an open position and a closed position; and a twisting unit that twists the wire wound around the steel bar by the first roller and the second roller. Summary of the Invention

[0003] Problems to be Solved by the Invention

[0004] In the above steel bar bundling machine, after the second roller is switched from the first state to the second state, the reel stopper is switched from the prohibited state to the permitted state.

[0005] In addition, in the above steel bar bundling machine, in order to maintain the reel stopper in the prohibited state, after the user switches the reel stopper from the permitted state to the prohibited state, the operation part is switched from the open position to the closed position. Therefore, the operation for switching the reel stopper from the permitted state to the prohibited state and maintaining it in the prohibited state is complicated.

[0006] In this specification, an object is to provide a steel bar bundling machine that can simply perform the state switching of the second roller and the state switching of the reel stopper, and a steel bar bundling machine that can suppress the operation for switching the reel stopper from the permitted state to the prohibited state and maintaining it in the prohibited state from becoming complicated.

[0007] Solutions to the Problems

[0008] The wire tying machine disclosed in this specification ties steel bars using a wire. The wire tying machine includes: a reel holding part that holds a reel with a wire in a manner that allows the reel to rotate about a reel rotation axis; a reel stopper that can be switched between a prohibited state in which the reel is prohibited from detaching from the reel holding part and a permitted state in which the reel is permitted to detach from the reel holding part; a first roller that can rotate; a second roller that can rotate, and the second roller can be switched between a first state in which the wire is clamped between the first roller and the second roller and a second state in which the distance between the first roller and the second roller is longer than the distance between the first roller and the second roller in the first state; and a twisting unit that twists the wire wound around the steel bar by using the first roller and the second roller. When the reel stopper is switched from the prohibited state to the permitted state, the second roller is switched from the first state to the second state.

[0009] According to the above structure, by switching the reel stopper from the prohibited state to the permitted state, the second roller is switched from the first state to the second state. Thereby, the state switching of the second roller and the state switching of the reel stopper can be simply performed.

[0010] The wire tying machine disclosed in this specification ties steel bars using a wire. The wire tying machine includes: a reel holding part that holds a reel with a wire in a manner that allows the reel to rotate about a reel rotation axis; a reel stopper that can be switched between a prohibited state in which the reel is prohibited from detaching from the reel holding part and a permitted state in which the reel is permitted to detach from the reel holding part; a first roller that can rotate; a second roller that can rotate, and the second roller can be switched between a first state in which the wire is clamped between the first roller and the second roller and a second state in which the force for clamping the wire between the first roller and the second roller is smaller than the force for clamping the wire between the first roller and the second roller in the first state; and a twisting unit that twists the wire wound around the steel bar by using the first roller and the second roller. When the reel stopper is switched from the prohibited state to the permitted state, the second roller is switched from the first state to the second state.

[0011] According to the above structure, by switching the reel stopper from the prohibited state to the permitted state, the second roller is switched from the first state to the second state. Thereby, the state switching of the second roller and the state switching of the reel stopper can be simply performed.

[0012] The wire tying machine disclosed in this specification ties steel bars using a wire. The wire tying machine includes: a reel holding part that holds a reel with a wire in a manner that allows the reel to rotate about a reel rotation axis; a reel stopper that can be switched between a prohibited state in which the reel is prohibited from detaching from the reel holding part and a permitted state in which the reel is permitted to detach from the reel holding part; and a locking lever that maintains the reel stopper in the prohibited state when engaged with the reel holding part. After the reel stopper is switched from the permitted state to the prohibited state, the locking lever engages with the reel holding part without being operated by the user.

[0013] According to the above structure, after the user switches the reel stopper from the permitted state to the prohibited state, there is no need to operate the locking lever. Therefore, it is possible to prevent the operation for switching the reel stopper from the permitted state to the prohibited state and maintaining it in the prohibited state from becoming complicated. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a perspective view of the steel bar bundling machine 2 according to the first embodiment.

[0015] Figure 2 is a left view of the state after removing the reel cover 6 and the left housing 10 in the steel bar bundling machine 2 according to the first embodiment.

[0016] Figure 3 is a cross-sectional view near the reel holding portion 22 of the steel bar bundling machine 2 according to the first embodiment.

[0017] Figure 4 is a cross-sectional view near the locking lever 52 of the steel bar bundling machine 2 according to the first embodiment.

[0018] Figure 5 is a perspective view of the state after opening the reel cover 6 in the steel bar bundling machine 2 according to the first embodiment.

[0019] Figure 6 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 according to the first embodiment.

[0020] Figure 7 is a cross-sectional view near the locking lever 52 of the steel bar bundling machine 2 according to the first embodiment.

[0021] Figure 8 is a front view when the second roller 98 is in the first state in the reel cover 6 and the feeding unit 74 according to the first embodiment.

[0022] Figure 9 is a front view when the second roller 98 is in the second state in the reel cover 6 and the feeding unit 74 according to the first embodiment.

[0023] Figure 10 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 according to the first embodiment.

[0024] Figure 11 is a cross-sectional view near the guide unit 76 of the steel bar bundling machines 2 according to the first embodiment and the tenth embodiment.

[0025] Figure 12It is a cross-sectional view when the front end of the cutter 128 is disposed at a position rearward of the wire guide hole 138 in the cutting unit 78 and the stranding unit 80 of the first embodiment.

[0026] Figure 13 It is a cross-sectional view when the front end of the cutter 128 is disposed at a position forward of the wire guide hole 138 in the cutting unit 78 and the stranding unit 80 of the first embodiment.

[0027] Figure 14 It is a perspective view of the cutting unit 78 and the stranding unit 80 of the first embodiment.

[0028] Figure 15 It is a top view of the state after the side plate 168 is opened in the steel bar bundling machine 2 of the first embodiment.

[0029] Figure 16 It is a cross-sectional view of the side plate 168, the sliding unit 170, and the detection sensor 172 of the first embodiment.

[0030] Figure 17 It is a perspective view of the vicinity of the bending member 192 of the steel bar bundling machine 2 of the first embodiment.

[0031] Figure 18 It is a cross-sectional view of the vicinity of the bending member 192 of the steel bar bundling machine 2 of the first embodiment.

[0032] Figure 19 It is a flowchart showing the processing executed by the control unit 82 of the first embodiment.

[0033] Figure 20 It is a cross-sectional view of the vicinity of the guide unit 76 of the steel bar bundling machine 2 of the first embodiment.

[0034] Figure 21 It is a flowchart showing the processing executed by the control unit 82 of the first embodiment.

[0035] Figure 22 It is a flowchart showing the processing executed by the control unit 82 of the first embodiment.

[0036] Figure 23 It is a side view of the wire W and the steel bar R after the wire W is stranded in the first embodiment.

[0037] Figure 24 It is a perspective view of the steel bar bundling machine 2 of the second embodiment.

[0038] Figure 25 It is a left view of the state after the left housing 10 is removed in the steel bar bundling machine 2 of the second embodiment.

[0039] Figure 26It is a cross-sectional view near the guide unit 76 of the steel bar bundling machine 2 of the second embodiment.

[0040] Figure 27 It is a front view of the steel bar bundling machine 2 of the sixth embodiment.

[0041] Figure 28 It is a front view of the steel bar bundling machine 2 of the seventh embodiment.

[0042] Figure 29 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 eighth embodiment.

[0043] Figure 30 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 eighth embodiment.

[0044] Figure 31 It is a cross-sectional view near the guide unit 76 of the steel bar bundling machine 2 of the ninth and tenth embodiments.

[0045] Figure 32 It is a side view of the guide unit 76 and the twisting unit 80 of the steel bar bundling machine 2 of the thirteenth and fourteenth embodiments. Detailed Description

[0046] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail with reference to the drawings. This detailed description is solely 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 steel bar bundling machine, a manufacturing method and a usage method thereof that are further improved, the additional features and technical solutions disclosed below can be used separately or in combination with other features and technical solutions.

[0047] Furthermore, the combination of the features and processes disclosed in the following detailed description is not necessary in the broadest sense for implementing the present invention 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 and below 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.

[0048] All features described in this specification and / or the claims are intended to be disclosed separately and independently, as limitations on the specific matters described in the disclosure of the original application and the claims, independent of the structure of the features described in the embodiments and / or the claims. Moreover, descriptions related to all numerical ranges and groups or sets are intended to disclose the structures among them as limitations on the specific matters described in the disclosure of the original application and the claims.

[0049] The wire tying machine disclosed in this specification uses a wire to tie steel bars. The wire tying machine includes: a reel holding part that holds a reel with a wire in a manner that allows the reel to rotate about a reel rotation axis; a reel stopper that can be switched between a prohibited state that prohibits the reel from detaching from the reel holding part and a permitted state that allows the reel to detach from the reel holding part; a first roller that can rotate; a second roller that can rotate, and the second roller can be switched between a first state in which the wire is clamped between the first roller and the second roller and a second state in which the distance between the first roller and the second roller is longer than the distance between the first roller and the second roller in the first state; and a twisting unit that twists the wire wound around the steel bar by the first roller and the second roller. When the reel stopper is switched from the prohibited state to the permitted state, the second roller is switched from the first state to the second state.

[0050] In one or more embodiments, it may also be that when the second roller is in the second state, the wire is not clamped between the first roller and the second roller.

[0051] According to the above structure, the wire can be more easily inserted between the first roller and the second roller, and the wire can be easily withdrawn from between the first roller and the second roller.

[0052] In one or more embodiments, it may also be that when the reel stopper is switched from the permitted state to the prohibited state, the second roller is switched from the second state to the first state.

[0053] According to the above structure, by switching the reel stopper from the permitted state to the prohibited state, the second roller is switched from the second state to the first state. Thereby, the state switching of the second roller and the state switching of the reel stopper can be simply performed.

[0054] In one or more embodiments, it may also be that the reel holding part has a reel accommodation space inside for accommodating the reel.

[0055] According to the above structure, when the reel is accommodated in the reel accommodation space, it is possible to suppress liquid and dust from adhering to the reel.

[0056] In one or more embodiments, the wire tying machine may further include a link member that rotatably supports the second roller and switches the second roller between a first state and a second state. The drum stopper may include an operating member that operates the link member when the drum stopper is switched from a prohibited state to a permitted state.

[0057] According to the above structure, by switching the drum stopper from the prohibited state to the permitted state using a simple structure, the second roller can be switched from the first state to the second state.

[0058] In one or more embodiments, the wire tying machine may further include a biasing member that biases the link member to switch the second roller from the second state to the first state.

[0059] According to the above structure, by the biasing force of the biasing member, the second roller can be easily switched from the second state to the first state.

[0060] In one or more embodiments, the drum stopper may be rotatable between a first position where it is in the prohibited state and a second position where it is in the permitted state. The drum stopper may rotate toward the first position when it is located closer to the first position than a neutral position between the first position and the second position, and rotate toward the second position when it is located closer to the second position than the neutral position.

[0061] According to the above structure, when the user rotates the drum stopper from the first position to the second position, after rotating the drum stopper beyond the neutral position, even if the drum stopper is released, the drum stopper can be rotated to the second position. Further, when the user rotates the drum stopper from the second position to the first position, after rotating the drum stopper beyond the neutral position, even if the drum stopper is released, the drum stopper can be rotated to the first position.

[0062] In one or more embodiments, the operating member may include a roller that is rotatable and abuts against the link member.

[0063] According to the above structure, the roller rotates while abutting against the link member. Thus, compared to a structure in which the operating member does not rotate while abutting against the link member, the force applied by the user to operate the drum stopper can be reduced.

[0064] In one or more embodiments, the link member may be rotatable about a link rotation axis. The distance between the position of the link member operated by the drum stopper and the link rotation axis may be longer than the distance between the position of the link member that supports the second roller and the link rotation axis.

[0065] According to the above configuration, the force of the user operating the spool stopper can be reduced compared to a configuration in which the distance between the position of the link member operated by the spool stopper and the link rotation axis is smaller than the distance between the position of the link member supporting the second roller and the link rotation axis.

[0066] In one or more embodiments, the reinforcing bar tying machine may further include a locking lever for user operation, the locking lever being mounted on the reel stopper. The locking lever may also maintain the reel stopper in a prohibited state when the locking lever is engaged with the reel holding portion.

[0067] According to the above configuration, the user can operate the lock lever with the hand that operates the reel stopper.

[0068] In one or more embodiments, the reel stopper may be rotatable about the stopper rotation axis. The stopper rotation axis may be arranged above the reel rotation axis and below the second roller.

[0069] According to the above configuration, compared with a configuration in which the stopper rotation axis is arranged below the spool rotation axis, it is possible to reduce the force applied by the user to operate the spool stopper.

[0070] In one or more embodiments, the reinforcing bar tying machine may further include: a reel pressing member mounted on the reel stopper; and a biasing member that biases the reel pressing member toward the reel when the reel stopper is in the prohibited state.

[0071] According to the above configuration, even when the reel rotates when the reel stopper is in the prohibited state, the reel can be prevented from rattling by the reel pressing member.

[0072] (First embodiment)

[0073] like Figure 1 As shown, the rebar bundling machine 2 is a handheld device. The rebar bundling machine 2 uses a metal wire W to bundle a plurality of rebars R. In the rebar bundling machine 2, metal wires W of various diameters (e.g., diameters of 0.5 mm to 2.5 mm) are used in accordance with the diameters of the bundled rebars R. For example, when bundling thin-diameter rebars R with a diameter of 16 mm or less (e.g., a diameter of 16 mm), metal wires W with a diameter of 1.6 mm or less (e.g., 0.8 mm) are used, and when bundling thick-diameter rebars R with a diameter greater than 16 mm (e.g., a diameter of 25 mm or 32 mm), metal wires W with a diameter of 1.6 mm or more (e.g., 2.0 mm) are used. Next, the twisting unit 80 (refer to Figure 2 ) is called the front-to-back direction, the direction perpendicular to the front-to-back direction is called the up-down direction, and the direction perpendicular to the front-to-back direction and the up-down direction is called the left-right direction.

[0074] 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.

[0075] 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.

[0076] As Figure 2 shown, the stranding unit storage portion 14 extends in the front-rear direction. The handle portion 16 is disposed below the rear portion of the stranding unit storage portion 14. The handle portion 16 is for the user to hold.

[0077] The battery mounting portion 18 is disposed below the handle portion 16. The battery pack BP is detachably mounted at 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.

[0078] The feeding unit storage portion 20 is disposed below the front portion of the stranding unit storage portion 14. The feeding unit storage portion 20 is disposed in front of the handle portion 16.

[0079] The reel holding portion 22 is disposed at a position lower than the feeding unit storage portion 20. In addition, in Figure 2 it, the reel holding portion 22 is shown 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 3 shown, the reel holding portion 22 can accommodate a reel 24. The reel 24 includes a wire W and a reel 26 around which the wire W is wound.

[0080] The reel holding portion 22 includes a base portion 30, a cylindrical portion 32, and a protrusion portion 34. The base portion 30 has a reel storage space 36 inside. The left end of the base portion 30 is open.

[0081] The cylindrical portion 32 is disposed in the reel storage space 36. The cylindrical portion 32 extends leftward from the base portion 30. The cylindrical portion 32 is inserted into the reel 26. By inserting the cylindrical portion 32 into the reel 26, the reel 24 is accommodated in the reel storage space 36. The cylindrical portion 32 holds the reel 24 in such a way that the reel 24 can rotate about a reel rotation axis AX1. The reel rotation axis AX1 extends in the left-right direction.

[0082] The protrusion portion 34 protrudes downward from the lower end of the base portion 30. The protrusion portion 34 is disposed outside the reel storage space 36. AsFigure 4 As shown, the protrusion 34 has a vertical surface 34a and an inclined surface 34b.

[0083] The vertical surface 34a is disposed on a surface 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.

[0084] As Figure 1 shown, the reel cover 6 includes a cover member 40 and an operation member 42 (see Figure 6 ). The cover member 40 is rotatably mounted on the left housing 10. In the present embodiment, the cover member 40 is mounted on the feed unit storage portion 20. The cover member 40 can rotate about the cover rotation axis AX2. By rotating the cover member 40, the reel cover 6 can be switched between a prohibited state and an allowed 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 ).

[0085] 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 storage space 36 is closed by the reel cover 6. Accordingly, the reel 24 is prohibited from being detached from the cylinder portion 32, that is, the reel 24 is prohibited from being removed from the reel storage space 36. In addition, when the reel cover 6 is located at the first position, the cover member 40 abuts against the protrusion 34 from the left side. Accordingly, the reel cover 6 can be inhibited from rotating beyond the first position.

[0086] As Figure 5 shown, when the reel cover 6 is in the allowed state, it is located at the second position. At this time, the reel storage space 36 is open. Accordingly, the reel 24 is allowed to be detached from the cylinder portion 32 (see Figure 3 ), that is, the reel 24 is allowed to be removed from the reel storage space 36. In addition, when the reel cover 6 is located at the second position, the cover member 40 abuts against the left housing 10. Accordingly, the reel cover 6 can be inhibited from rotating beyond the second position.

[0087] As Figure 6 shown, the operation member 42 is mounted on one end of the cover member 40. The operation member 42 is disposed near the cover rotation axis AX2. The operation member 42 includes a roller 44. The roller 44 is, for example, a bearing such as a needle bearing. The roller 44 rotates about 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 operation member 42. The central axis AX3 is substantially parallel to the cover rotation axis AX2.

[0088] As Figure 3 shown, the steel bar bundling machine 2 further includes a reel pressing member 48, a biasing member 50, a locking lever 52, and a biasing member 54 (seeFigure 7 )。The reel pressing member 48 has a substantially frustum shape. The reel pressing member 48 is slidably mounted on 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.

[0089] 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. Consequently, it is possible to suppress the reel 24 from wobbling 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.

[0090] As Figure 7 shown, the locking lever 52 is mounted at the lower end of the cover member 40. The locking lever 52 includes a lever main body portion 56 and an engaging portion 58.

[0091] The lever main body portion 56 can rotate about the lever rotation axis AX4. The lever main body portion 56 is operated by the user. The biasing member 54 is sandwiched between the rear end of the lever main body portion 56 and the cover member 40. The biasing member 54 biases the lever main body portion 56 in a direction to move the rear end of the lever main body portion 56 away from the cover member 40. Further, the distance between the cover rotation axis AX2 (see Figure 6 ) and the lever main body portion 56 is longer than the distance from the cover rotation axis AX2 to the operation member 42 (see Figure 6 ). Thus, the force for the user to operate the reel cover 6 becomes smaller.

[0092] The engaging portion 58 is disposed at a position forward of the lever rotation axis AX4. As Figure 3 shown, the engaging portion 58 includes a vertical surface 58a and an inclined surface 58b.

[0093] 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, it is possible to suppress the reel cover 6 from rotating from the first position to the second position.

[0094] 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 coming into contact with the inclined surface 34b of the protrusion 34. As a result, 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.

[0095] 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 (refer to Figure 2 ).

[0096] 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.

[0097] The trigger 70 is mounted on the upper part of the front surface of the handle portion 16 so as to be pullable. The trigger 70 is operated by the user.

[0098] 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 into by the trigger 70. When the wire tying machine 2 is in the ON state, if the trigger switch 72 is pressed in, the wire tying machine 2 ties the reinforcing bar R using the wire W.

[0099] The wire tying machine 2 further includes a feeding unit 74, a guiding unit 76, a cutting unit 78, a twisting unit 80, and a control unit 82.

[0100] 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 toFigure 6 )。

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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 (not shown) of the feeding motor 88. The transfer roller 94 has teeth 94a formed on the outer peripheral surface.

[0105] 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 a driving roller. The groove 96b extends around the outer peripheral surface for one week.

[0106] 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 in the case where the teeth 98a mesh with the teeth 96a, the second roller 98 rotates about the second roller rotation axis AX7. Therefore, the second roller 98 corresponds to a driven roller. The groove 98b extends around the outer peripheral surface for one week. When the wire W is disposed between the first roller 96 and the second roller 98 in a state where the teeth 98a mesh with the teeth 96a, the wire W is sandwiched between the first roller 96 and the second roller 98 in the grooves 96b and 98b. In this state, when the first roller 96 rotates in the forward direction, the wire W is pulled out from the reel 26 (see Figure 3 ) and sent toward the guide unit 76 (see 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.

[0107] As Figure 6As 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 lower than the first roller 96 and the second roller 98 and at a position higher than 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 lower than 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.

[0108] 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 in the grooves 96b and 98b. Therefore, the first state corresponds to the clamping state.

[0109] As Figure 9 shown, when the second roller 98 is in the second state, it is located at the second roller position. 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 do not mesh with the teeth 96a of the first roller 96. In this state, the wire W is not sandwiched 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. Thereby, 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 ).

[0110] As Figure 6 shown, the biasing member 102 is sandwiched 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.

[0111] In this 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 a 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 toward 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 smaller 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.

[0112] As Figure 6 shown, when the drum cover 6 is in a position 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, whereby a force for rotating the drum cover 6 toward the second position is applied to the drum cover 6. Therefore, if the drum cover 6 exceeds the neutral position when the drum cover 6 rotates from the first position to the second position, the drum cover 6 will automatically rotate toward the second position even if the user's hand leaves the drum cover 6. In addition, the drum cover 6 is maintained in the second position under the biasing action of the biasing member 102. When the drum cover 6 is in 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. In addition, as Figure 10 shown, when the drum cover 6 is in a position closer to the first position than the neutral position, the link member 100 is biased by the biasing member 102, whereby a force for rotating the drum cover 6 toward the first position is applied to the drum cover 6. Therefore, if the drum cover 6 exceeds the neutral position when the drum cover 6 rotates from the second position to the first position, the drum cover 6 will automatically rotate toward the first position even if the user's hand leaves the drum cover 6.

[0113] When replacing the drum 24, as Figure 5 shown, the user holds the drum cover 6 with a hand, and after pressing the locking lever 52 with the hand holding the drum cover 6, rotates the drum cover 6 from the first position to the second position. As Figure 6 shown, the roller 44 presses the lower end of the link member 100, whereby the link member 100 rotates from the first link position to the second link position. As Figure 9As shown, the second roller 98 rotates from the first roller position to the second roller position, thereby switching 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 cylinder part 32, the user installs a new reel 24 on the cylinder part 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, whereby 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, thereby switching from the second state to the first state. As a result, the wire W is clamped between the first roller 96 and the second roller 98.

[0114] As Figure 11 shown, the guide unit 76 is supported by the main body housing 4. The guide unit 76 includes a first guide member 110, a second guide member 112, a first pin 114, a second pin 115, and a wire guide 116. The first guide member 110 and the second guide member 112 are fixed to the front end of the stranding unit housing portion 14. The first guide member 110 and the second guide member 112 extend forward from the front end of the stranding unit housing portion 14. The first guide member 110 opens downward. The first guide member 110 has a first wire passage 120, and the first wire passage 120 has a bent shape that bulges upward. The second guide member 112 is arranged below the first guide member 110 so as to be separated from the first guide member 110. The reinforcing bar R is arranged between the first guide member 110 and the second guide member 112 during bundling. The second guide member 112 opens upward. The second guide member 112 has a second wire passage 122.

[0115] The first pin 114 and the second pin 115 are fixed to the first guide member 110. A part of the first pin 114 and the second pin 115 are arranged in the first wire passage 120. The first pin 114 is arranged near the outlet 120a of the first wire passage 120. The second pin 115 is arranged near the inlet 120b of the first wire passage 120.

[0116] The wire guide 116 is fixed to the second guide member 112. The wire guide 116 is arranged between the feeding unit 74 and the first guide member 110. The wire guide 116 has a guide hole 116a.

[0117] 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 guide hole 116a of the wire guide 116. The wire W is guided by the first guide member 110 and passes through the inside of the first wire passage 120 from the rear to the front. When passing through the inside of the first wire passage 120, the wire W abuts against the first pin 114 and the second pin 115. Thereby, a downward winding tendency is imparted to the wire W. After passing through the outlet 120a of the first wire passage 120, the wire W is conveyed to the inlet 122a of the wire passage 122. The wire W is guided by the second guide member 112 and passes through the inside of the second wire passage 122 from the front to the rear. After that, after passing through the outlet 122b of the second wire passage 122, the wire W moves upward to the rear. By forming the loop RP of the wire W, the wire W is wound around the steel bar R. The steel bar R penetrates the loop RP in the left-right direction.

[0118] As Figure 2 shown, the cutting unit 78 is housed in the stranding unit housing 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 guide 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 (see Figure 14 ) and a biasing member 134 (see Figure 14 ).

[0119] The tool guide 126 is fixed to the stranding unit housing 14 (see 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 up-down direction. The wire guide hole 138 faces the guide hole 116a of the wire guide 116. The wire guide hole 138 is disposed between the guide hole 116a and the inlet 120b of the first wire passage 120. Therefore, 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.

[0120] 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.

[0121] 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 twisting unit 80, the push rod 130 approaches the tool guide 126. Thereby, the tool 128 slides to a position forward of the wire guide hole 138. As a result, the wire W is cut by the tool 128 and the tool guide 126.

[0122] The second rod portion 142 is located at the rear end of the push rod 130. When the second rod portion 142 is pushed backward by the twisting unit 80, the push rod 130 separates from the tool guide 126.

[0123] As Figure 14 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.

[0124] 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.

[0125] As Figure 2 shown, the twisting unit 80 is housed in the twisting unit housing portion 14. The twisting unit 80 is supported by the main body housing 4. The twisting unit 80 is disposed above the cutting unit 78. In the up-down direction, the twisting unit 80 is disposed between the first guide member 110 and the second guide member 112. As Figure 14 shown, the twisting unit 80 includes a twisting motor 146, a speed reducer 148, a screw shaft 150, a sleeve unit 152, a push plate 154, and a gripping unit 156.

[0126] The twisting motor 146 is, for example, a brushless motor. The twisting motor 146 rotates about the central axis AX8 by the electric 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 twisting motor 146 is transmitted to the screw shaft 150 via the speed reducer 148. Thereby, the screw shaft 150 rotates about the central axis AX8.

[0127] 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).

[0128] 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 backward, it pushes the second rod portion 142 backward. Even if the sleeve unit 152 rotates, the push plate 154 does not rotate.

[0129] The gripping unit 156 protrudes 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 (refer to Figure 11 ). The gripping unit 156 includes a clamp shaft 160, a right clamp 162, and a left clamp 164.

[0130] 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.

[0131] The right clamp 162 is mounted on the clamp shaft 160 so as to penetrate the clamp shaft 160 from the right side to the left side. The right clamp 162 is movable relative to the clamp shaft 160 in the left-right direction. The right clamp 162 is disposed at the rightmost 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 portion of the wire W is clamped between the right clamp 162 and the clamp shaft 160.

[0132] The left clamp 164 is mounted on the clamp shaft 160 so as to penetrate the clamp shaft 160 from the left side to the right side. The left clamp 164 is movable relative to the clamp shaft 160 in the left-right direction. The left clamp 164 is disposed at the leftmost 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 portion of the wire W is clamped between the left clamp 164 and the clamp shaft 160.

[0133] When the sleeve unit 152 rotates while the one end and the other end of the wire W are held by the gripping unit 156, the gripping unit 156 rotates about the central axis AX8. The wire W is twisted, and thereby the reinforcing bar R (refer to Figure 2 ) is tied up by the wire W.

[0134] As Figure 2As 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 (see Figure 1 ), the display unit 64 (see Figure 1 ), the bundling force increasing switch 66 (see Figure 1 ), the bundling force decreasing switch 68 (see Figure 1 ), the trigger switch 72, the feeding motor 88, the twisting motor 146, and the battery pack BP.

[0135] 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 (see Figure 16 ). One sliding unit 170 and one detection sensor 172 are provided for one side plate 168.

[0136] The pair of side plates 168 are mounted at the front end of the twisting unit housing portion 14. When bundling the steel bar R with the wire W, the pair of side plates 168 are pressed against the steel bar R. One side plate 168 is pivotally mounted to the right housing 8. The other side plate 168 is pivotally mounted to the left housing 10. As Figure 2 shown, the side plate 168 is normally closed under the biasing action of the biasing member 174. The gripping unit 156 is disposed at a position rearward of the side plate 168.

[0137] The sliding unit 170 and the detection sensor 172 are disposed inside the twisting unit housing portion 14. The sliding unit 170 and the detection sensor 172 are disposed above the twisting 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.

[0138] The sliding plate 178 extends in the front-rear direction. The sliding plate 178 is supported by the twisting unit housing portion 14 so as to be slidable in the front-rear direction (see Figure 2 ). The sliding plate 178 abuts against the side plate 168 from the rear side.

[0139] 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. Thereby, the sliding plate 178 is pressed against the side plate 168.

[0140] The detection sensor 172 is electrically connected to the control unit 82 (see Figure 2 ). The detection sensor 172 includes a sensor substrate 186 and a sensor element 188. The sensor substrate 186 is fixed to the twisting unit housing portion 14 (see 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 open, 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 open are shown by dashed lines. The magnetic change of the magnet 182 is detected by the sensor element 188, so as to detect the opening and closing of the side plate 168 by the sensor 172.

[0141] As Figure 17 shown, the steel bar bundling machine 2 further includes a bending member 192. The bending member 192 is received in the stranding unit receiving portion 14. The bending member 192 has a plate shape. The bending member 192 is arranged along a plane including the front-rear 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 guiding hole 138. The bending member 192 is arranged at a position to the left of the wire guiding 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 guiding hole 138 and the second wire passage 122.

[0142] The bending member 192 has an abutting surface 194. The abutting surface 194 is formed at 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 side. The abutting surface 194 faces the upper right side.

[0143] As Figure 18As shown, the abutting surface 194 is disposed at a position closer to the front side (the side of the steel bar R) than the cutting tool 128. The abutting surface 194 is disposed at a position above the wire guiding hole 138 and below the gripping unit 156. Therefore, in the vertical direction, the abutting surface 194 is disposed between the wire guiding hole 138 and the gripping unit 156. When observing the steel bar 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.

[0144] 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 the control unit 82 shown performs Figure 19 the process shown.

[0145] As Figure 19 shown, in S2, the control unit 82 performs an initialization process. Specifically, the control unit 82 repeatedly performs 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 twisting motor 146 forward by a specified number of rotations, and then rotates the twisting 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. Thereby, the push rod 130 moves forward, and the cutting tool 128 slides to a position closer to the front side than the wire guiding hole 138. Next, when the sleeve unit 152 moves backward, the push rod 130 is biased backward by the biasing member 134 and returns to the initial position. When the control unit 82 determines that the current value of the twisting 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 cutting-off process is completed. The situation where the current value of the twisting motor 146 has decreased after reaching a specified value or more corresponds to the wire W being cut by the cutting tool 128. At the end of the initialization process, the front end W1 of the wire W is disposed within the wire guiding hole 138.

[0146] In S4, the control unit 82 performs a wire pre-feeding process. Specifically, the control unit 82 rotates the feeding motor 88 forward by a reference number of rotations. As Figure 20As shown, by rotating the first roller 96 in the forward direction, the front end W1 of the wire W is sent out from the wire guiding hole 138 to the first position. The first position is arranged on the side of the outlet 120a of the first wire passage 120, which is closer to the first wire passage 120 than the wire guiding hole 138 and the cutter 128. The first position is arranged within the first wire passage 120. The first position is arranged at the outlet 120a of the first wire passage 120. The first position is not arranged on the side of the inlet 122a of the second wire passage 122, which is closer to the outlet 120a of the first wire passage 120.

[0147] In S6, the control unit 82 sets the number of rotations of the feed motor 88 in the winding process described later to the first number of rotations. When the feed motor 88 rotates in the forward direction by the first number of rotations, the first roller 96 rotates in the forward direction, and thus the front end W1 of the wire W is sent out from the first position to the left wire passage 166.

[0148] In addition, after the control unit 82 executes Figure 19 the processing shown, it executes Figure 21 and Figure 22 the processing shown.

[0149] As Figure 21 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 enters S22.

[0150] In S22, the control unit 82 determines whether it is the first time to pull the trigger 70 after the initialization process. When the control unit 82 determines that it is the first time to pull the trigger 70 after the initialization process ("Yes" in S22), it enters Figure 22 S30. On the other hand, when the control unit 82 determines that it is not the first time to pull the trigger 70 after the initialization process ("No" in S22), it enters S24.

[0151] S24 corresponds to the Figure 21 and Figure 22 processing executed the second time and later after the initialization process. In S24, the control unit 82 determines whether the side plate 168 has been opened and closed in the Figure 21 and Figure 22 processing executed last time. When the control unit 82 determines that the side plate 168 has been opened and closed ("Yes" in S24), it enters 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 enters S26.

[0152] 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 entersFigure 22 of S30.

[0153] As Figure 22 shown, in S30, the control unit 82 performs a 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 twisting process, a bending process, and a wire releasing process.

[0154] (Winding Process)

[0155] The control unit 82 rotates the feed motor 88 in the forward direction. Thereby, 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.

[0156] (First Gripping Process)

[0157] The first gripping process is performed after the winding process. When the time when the bundling process starts is set to 0 seconds, the first gripping process is performed after 0.10 seconds. The control unit 82 rotates the twisting motor 146 in the forward direction. By Figure 14 shown, the sleeve unit 152 moves forward, so that the left clamp 164 moves to the right relative to the clamp shaft 160. Thereby, 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.

[0158] (Pulling-back Process)

[0159] The pulling-back process is performed after the first gripping process. The pulling-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. Thereby, the loop RP of the wire W is reduced in diameter and contacts the steel bar R. In addition, in Figure 11 , the wire W after the diameter reduction is shown by a dotted line.

[0160] (Second Gripping Process)

[0161] The second gripping process is performed after the pulling-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 movement of the sleeve unit 152 shown in the figure in the forward direction, the right clamp 162 moves leftward 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.

[0162] (Cutting process)

[0163] 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 further forward movement of the sleeve unit 152, 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 of the wire W by the cutting tool 128 is sometimes referred to as the end W2 of the wire W.

[0164] (Stranding process, bending process)

[0165] 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 rotates the stranding motor 146 further in the forward direction. By the rotation of the sleeve unit 152 and the gripping unit 156, the wire W is stranded. As a result, the steel bar R is bundled using the wire W. As Figure 18 shown, when the wire W is stranded, the end W2 of the wire W slides on the abutment surface 194 after abutting against the abutment surface 194. As a result, the end W2 of the wire W is bent toward the steel bar R. In Figure 18 , the end W2 of the bent wire W is shown by a dotted line, and the wire W is shown exaggeratedly. As Figure 23 shown, the ear height L1 representing the maximum distance between the steel 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.

[0166] (Wire release process)

[0167] After the stranding process, a wire release process is performed. 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. Thereby, the front end W1 and the end W2 of the wire W are no longer held by the holding unit 156. The wire release process is completed 0.48 seconds after the start of the bundling process.

[0168] 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 the bundling of the reinforcing bar R is completed, the user moves the reinforcing bar bundling machine 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 a 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.

[0169] 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 larger than the first number of rotations. When the feed motor 88 rotates in the forward direction by the second number of rotations, the first roller 96 rotates in the forward direction, whereby the front end W1 of the wire W is fed out from the wire guide hole 138 to the left wire passage 166. Then, the control unit 82 returns to S20.

[0170] In S36, the control unit 82 rotates the stranding motor 146 in the reverse direction, thereby returning the stranding unit 80 to the initial position.

[0171] In S38, the control unit 82 performs a wire pre-feed process. Thereby, 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.

[0172] 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.

[0173] In S42, the control unit 82 sets the number of rotations of the feed motor 88 to the first number of rotations. After that, the control unit 82 returns to S20.

[0174] In S44, the control unit 82 sets the number of rotations of the feed motor 88 to the first number of rotations. After that, the control unit 82 returns to S30. The control unit 82 executes the processes of S44 and S30 substantially simultaneously. Thus, after the process of S38, the wire W is wound around the steel bar R without the feed motor 88 stopping.

[0175] (Effect)

[0176] The steel bar bundling machine 2 of the present embodiment bundles the steel bar R using the wire W. The steel bar bundling machine 2 includes: a reel holding portion 22 that holds the reel 24 in a manner that allows the reel 24 having the wire W to rotate about the reel rotation axis AX1; a reel cover 6 (an example of a reel stopper) that can be switched between a prohibited state in which the reel 24 is prohibited from detaching from the reel holding portion 22 and a permitted state in which the reel 24 is permitted to detach from the reel holding portion 22; a first roller 96 that can rotate; a second roller 98 that can rotate, and the second roller 98 can be switched between a first state in which the wire W is sandwiched between the first roller 96 and the second roller 98 and a second state in which 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; and a twisting unit 80 that twists the wire W wound around the steel bar R by the first roller 96 and the second roller 98. When the reel cover 6 is switched from the prohibited state to the permitted state, the second roller 98 is switched from the first state to the second state.

[0177] According to the above structure, by switching the reel cover 6 from the prohibited state to the permitted state, the second roller 98 is switched from the first state to the second state. Thus, the state switching of the second roller 98 and the state switching of the reel cover 6 can be simply performed.

[0178] In addition, when the second roller 98 is in the second state, the wire W is not sandwiched between the first roller 96 and the second roller 98.

[0179] According to the above structure, the wire W can be more easily inserted between the first roller 96 and the second roller 98, and the wire W can be easily withdrawn from between the first roller 96 and the second roller 98.

[0180] In addition, when the reel cover 6 is switched from the permitted state to the prohibited state, the second roller 98 is switched from the second state to the first state.

[0181] According to the above structure, by switching the reel cover 6 from the permitted state to the prohibited state, the second roller 98 is switched from the second state to the first state. Thus, the state switching of the second roller 98 and the state switching of the reel cover 6 can be simply performed.

[0182] In addition, the reel holding portion 22 has a reel storage space 36 inside for storing the reel 24.

[0183] According to the above structure, when the reel 24 is stored in the reel storage space 36, it is possible to suppress the attachment of liquid and dust to the reel 24.

[0184] In addition, the wire tying machine 2 further includes a link member 100 that supports the second roller 98 so as to be rotatable and switches the second roller 98 between the first state and the second state. The reel cover 6 includes an operating member 42 that operates the link member 100 when the reel cover 6 is switched from the prohibited state to the permitted state.

[0185] According to the above structure, it is possible to switch the second roller 98 from the first state to the second state by simply switching the reel cover 6 from the prohibited state to the permitted state with a simple structure.

[0186] In addition, the wire tying machine 2 further includes a biasing member 102 that biases the link member 100 to switch the second roller 98 from the second state to the first state.

[0187] According to the above structure, under the biasing action of the biasing member 102, the second roller 98 can be easily switched from the second state to the first state.

[0188] In addition, the reel cover 6 can rotate between a first position where it is in the prohibited state and a second position where it is in the permitted state. The reel cover 6 rotates toward the first position when it is located closer to the first position than the neutral position between the first position and the second position, and rotates toward the second position when it is located closer to the second position than the neutral position.

[0189] According to the above structure, when the user rotates the reel cover 6 from the first position to the second position, even if the reel cover 6 is released after being rotated beyond the neutral position, the reel cover 6 can be rotated to the second position. Further, when the user rotates the reel cover 6 from the second position to the first position, even if the reel cover is released after being rotated beyond the neutral position, the reel cover 6 can be rotated to the first position.

[0190] Further, the operating member 42 includes a roller 44 that is rotatable and abuts against the link member 100.

[0191] According to the above structure, the roller 44 rotates in a state of abutting against the link member 100. Thereby, compared with a structure in which the operating member 42 does not rotate in a state of abutting against the link member 100, the force for the user to operate the reel cover 6 can be reduced.

[0192] Further, the link member 100 is rotatable about a link rotation axis AX5. The distance between the position of the link member 100 operated by the reel cover 6 and the link rotation axis AX5 is longer than the distance between the position of the link member 100 supporting the second roller 98 and the link rotation axis AX5.

[0193] According to the above structure, compared with a structure in which the distance between the position of the link member 100 operated by the reel cover 6 and the link rotation axis AX5 is shorter than the distance between the position of the link member 100 supporting the second roller 98 and the link rotation axis AX5, the force for the user to operate the reel cover 6 can be reduced.

[0194] Further, the wire bundling machine 2 further includes a locking lever 52 for the user to operate, and the locking lever 52 is attached to the reel cover 6. The locking lever 52 maintains the reel cover 6 in a prohibited state when engaged with the reel holding portion 22.

[0195] According to the above structure, the user can operate the locking lever 52 with the hand that operates the reel cover 6.

[0196] Further, the reel cover 6 is rotatable about a cover rotation axis AX2 (an example of a stopper rotation axis). The cover rotation axis AX2 is disposed at a position above the reel rotation axis AX1 and at a position below the second roller 98.

[0197] According to the above structure, compared with a structure in which the cover rotation axis AX2 is disposed at a position below the reel rotation axis AX1, the force for the user to operate the reel cover 6 can be reduced.

[0198] Further, the wire bundling machine 2 further includes: a reel pressing member 48 attached to the reel cover 6; and a biasing member 50 that biases the reel pressing member 48 toward the reel 24 when the reel cover 6 is in a prohibited state.

[0199] According to the above structure, even if the reel 24 rotates when the reel cover 6 is in the prohibited state, the reel pressing member 48 can be used to suppress the shaking of the reel 24.

[0200] The wire tying machine 2 of the present embodiment ties the reinforcing bars R with the wire W. The wire tying machine 2 includes: a reel holding portion 22 that holds the reel 24 so that the reel 24 having the wire W can rotate about the reel rotation axis AX1; a reel cover 6 (an example of a reel stopper) that can be switched between a prohibited state in which the reel 24 is prohibited from detaching from the reel holding portion 22 and a permitted state in which the reel 24 is permitted to detach from the reel holding portion 22; and a locking lever 52 that maintains the reel cover 6 in the prohibited state when engaged with the reel holding portion 22. After the reel cover 6 is switched from the permitted state to the prohibited state, the locking lever 52 engages with the reel holding portion 22 without being operated by the user.

[0201] According to the above structure, after the user switches the reel cover 6 from the permitted state to the prohibited state, there is no need to operate the locking lever 52. Therefore, it is possible to prevent the operation of switching the reel cover 6 from the permitted state to the prohibited state and maintaining it in the prohibited state from becoming complicated.

[0202] (Second Embodiment)

[0203] In the second embodiment, the differences from the first embodiment will be described. As Figure 24 shown, the shape of the wire tying machine 2 of the second embodiment is different from the shape of the wire tying machine 2 of the first embodiment.

[0204] As Figure 25 shown, the control unit 82 is housed in the stranding unit housing portion 14. In addition, in Figure 25 , the reel cover 6 is open. The control unit 82 is disposed below the stranding unit 80. The cutting unit 78 is disposed at a position above the stranding unit 80. The handle portion 16 is disposed below the stranding 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 stranding unit housing portion 14 and above the handle portion 16. The reel holding portion 22 is disposed behind the stranding unit housing portion 14 and the feeding unit housing portion 20 and at a position 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 stranding unit 80. The feeding unit 74 feeds the wire W pulled out from the reel 26 forward.

[0205] 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 (refer to Figure 25 ) operates.

[0206] 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.

[0207] 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. Thereby, 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-feed process is executed 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.

[0208] (The third embodiment)

[0209] In the third embodiment, the differences from the first embodiment are described. The start times of the respective processes of the bundling process in the third 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.

[0210] The first gripping process is executed 0.09 seconds after the start of the bundling process. The pulling-back process is executed 0.14 seconds after the start of the bundling process. The second gripping process is executed 0.20 seconds after the start of the bundling process. The cutting process is executed 0.23 seconds after the start of the bundling process. The stranding process is executed 0.26 seconds after the start of the bundling process. The wire release process is executed 0.34 seconds after the start of the bundling process. The wire release process is completed 0.40 seconds after the start of the bundling process.

[0211] (The fourth embodiment)

[0212] In the fourth embodiment, the differences from the first embodiment are 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 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.

[0213] The first gripping step is performed 0.08 seconds after the start of the bundling process. The retracting step is performed 0.13 seconds after the start of the bundling process. The second gripping step is performed 0.18 seconds after the start of the bundling process. The cutting step is performed 0.20 seconds after the start of the bundling process. The twisting step is performed 0.23 seconds after the start of the bundling process. The wire releasing step is performed 0.30 seconds after the start of the bundling process. The wire releasing step is completed 0.35 seconds after the start of the bundling process.

[0214] (The fifth embodiment)

[0215] In the fifth embodiment, the differences from the first embodiment are described. The start times of the respective steps of the bundling process in the fifth embodiment are different from the start times of the respective steps 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.

[0216] The first gripping step is performed 0.06 seconds after the start of the bundling process. The retracting step is performed 0.11 seconds after the start of the bundling process. The second gripping step is performed 0.15 seconds after the start of the bundling process. The cutting step is performed 0.17 seconds after the start of the bundling process. The twisting step is performed 0.19 seconds after the start of the bundling process. The wire releasing step is performed 0.26 seconds after the start of the bundling process. The wire releasing step is completed 0.30 seconds after the start of the bundling process.

[0217] (The sixth embodiment)

[0218] In the sixth embodiment, the differences from the first embodiment are described. As Figure 27 shown, the configuration of the bending member 192 in the sixth embodiment is different from the configuration of the bending member 192 in the first embodiment.

[0219] The bending member 192 is disposed 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 at a part of the upper surface of the bending member 192.

[0220] In a modification of the sixth embodiment, as Figure 27 shown by the dashed line in, the bending member 192 may be disposed on the left side of the gripping unit 156. In the case of this structure, the abutting surface 194 may be formed at a part of the lower surface of the bending member 192.

[0221] In another modification of the sixth embodiment, as Figure 27As shown by the dashed line, the bent member 192 can be arranged above the gripping unit 156. In the case of this structure, the abutting surface 194 can be formed locally on the lower surface of the bent member 192.

[0222] (Seventh Embodiment)

[0223] In the seventh embodiment, the differences from the first embodiment will be described. As Figure 28 shown, the shape of the bent member 192 in the seventh embodiment is different from the shape of the bent member 192 in the first embodiment.

[0224] The bent member 192 has a cylindrical shape. The bent member 192 is fixed to the main body housing 4. The bent member 192 surrounds the gripping unit 156. The abutting surface 194 is formed locally on the inner peripheral surface of the bent member 192.

[0225] (Eighth Embodiment)

[0226] 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 supporting member 302, a biasing member 304, and an operating member 306.

[0227] The sliding member 300 is slidably supported by the supporting member 302.

[0228] The supporting member 302 is fixed to the fixed base 90.

[0229] 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.

[0230] 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.

[0231] When the reel cover 6 is in the first position, the sliding member 300 is arranged 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.

[0232] 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.

[0233] (Effect)

[0234] In the present embodiment, a wire tying machine 2 ties reinforcing bars R using a wire W. The wire tying machine 2 includes: a reel holding part 22 that holds a reel 24 having a wire W in a manner that allows the reel 24 to rotate about a reel rotation axis AX1; a reel cover 6 (an example of a reel stopper) that can be switched between a prohibited state in which the reel 24 is prohibited from detaching from the reel holding part 22 and a permitted state in which the reel 24 is permitted to detach from the reel holding part 22; a first roller 96 that can rotate; a second roller 98 that can rotate, and the second roller 98 can be switched between a first pressing state (an example of a first state) in which the wire W is clamped between the first roller 96 and the second roller 98 and a second pressing state (an example of a second state) in which the force for clamping the wire W between the first roller 96 and the second roller 98 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; and a twisting unit 80 that twists the wire W wound around the reinforcing bar R by the first roller 96 and the second roller 98. When the reel cover 6 is switched from the prohibited state to the permitted state, the second roller 98 is switched from the first pressing state to the second pressing state.

[0235] According to the above structure, by switching the reel cover 6 from the prohibited state to the permitted state, the second roller 98 can be easily switched from the first pressing state to the second pressing state. In addition, since 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, the wire W can be easily inserted between the first roller 96 and the second roller 98. Therefore, it is possible to prevent the operation of replacing the reel from becoming complicated.

[0236] (Embodiment 9)

[0237] In Embodiment 9, the differences from Embodiment 1 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.

[0238] When the pressing member 400 is pressed by the reinforcing bar R in a state where the trigger 70 (refer to Figure 2 ) is pressed, the control unit 82 (refer to Figure 2 ) executes Figure 22 the tying process of S30.

[0239] (Embodiment 10)

[0240] In the tenth embodiment, the differences from the ninth embodiment will be described. In the tenth embodiment, the wire tying machine 2 does not have a trigger 70 (refer to Figure 2 ). When the pressing member 400 is pressed into by the reinforcing bar R, the control unit 82 (refer to Figure 2 ) executes the tying process of S30 in Figure 22 .

[0241] (Eleventh embodiment)

[0242] In the eleventh embodiment, the differences from the first embodiment will be described. In the eleventh 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 forward by the second number of rotations. As a result, as shown in Figure 11 , 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. Thus, a loop RP of the wire W is formed. Next, the control unit 82 rotates the stranding motor 146 forward. The sleeve unit 152 shown in Figure 14 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 held by the holding unit 156.

[0243] As shown in Figure 11 , when the user ties 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 tying process of S30 in Figure 22 . Specifically, the tying process includes a pulling-back process, a second holding process, a cutting process, a stranding 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 held by the holding unit 156, the tying process does not include a winding process and a first holding process.

[0244] (Twelfth embodiment)

[0245] In the twelfth embodiment, the differences from the first embodiment will be described. In the twelfth 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 forward by the second number of rotations. As a result, as shown in Figure 11As shown, 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. Thereby, a loop RP of the wire W is formed.

[0246] When the user uses the wire W to tie the steel 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 steel bar R is passed 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 Figure 22 the 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.

[0247] (The 13th embodiment)

[0248] 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.

[0249] In the 13th embodiment, in Figure 19 S4 of Figure 22 and the wire pre-feeding process of S38 in Figure 32 shown, the control unit 82 first rotates the feeding motor 88 forward 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 forward. By the forward movement of the sleeve unit 152, the hook 500 closes. Thereby, the loop RP of the wire W is held by the hook 500.

[0250] When the user uses the wire W to tie the steel bar R, before pulling the trigger 70, first, the steel bar R is passed through the loop RP of the wire W. Next, the user pulls the trigger 70 (refer to Figure 25 ). Thereby, the control unit 82 executes Figure 22The 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 retracting process, and a second holding process.

[0251] In the wire releasing process, the control unit 82 rotates the twisting motor 146 in the reverse direction. The sleeve unit 152 moves backward, so that the hook 500 opens. 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 are described in the first embodiment, the description of the cutting process, the twisting process, and the bending process is omitted.

[0252] (The 14th embodiment)

[0253] In the 14th embodiment, the differences from the 13th embodiment are described. In the 14th embodiment, in the Figure 19 S4 and Figure 22 in the wire pre-feeding process of S38, the control unit 82 rotates the feeding motor 88 in the forward direction for the second number of rotations. Thus, as Figure 32 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.

[0254] When the user uses the wire W to bundle the steel bar R, first, before pulling the trigger 70, the steel bar R passes 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 the Figure 22 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.

[0255] In the holding process, the control unit 82 rotates the twisting motor 146 in the forward direction. The sleeve unit 152 moves forward, so that the hook 500 closes. Thus, the loop RP of the wire W is held by the hook 500.

[0256] (Variant example)

[0257] In one embodiment, the steel bar bundling machine 2 may also be a device that moves autonomously on the steel bar R.

[0258] In one embodiment, the first position may be arranged between the cutter 128 and the first wire passage 120.

[0259] In one embodiment, it is also possible that the bending member 192 is fixed to the main body housing 4.

[0260] In one embodiment, it is also possible that the abutting surface 194 is not bent.

[0261] In one embodiment, it is also possible that the bending member 192 does not define the second wire passage 122.

[0262] In one embodiment, it is also possible that after performing the cutting process and before performing the stranding process, the bending member 192 bends the end W2 of the wire W toward the reinforcing bar R.

[0263] In one embodiment, it is also possible that the link member 100 supports 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".

[0264] In one embodiment, it is also possible that 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.

[0265] In one embodiment, it is also possible that the reel holding portion 22 does not have the 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.

[0266] In one embodiment, it is also possible that the operating member 42 includes a non-rotatable abutting portion. In the case of this structure, the abutting portion is pressed into the lower end of the link member 100.

[0267] In one embodiment, it is also possible that the locking lever 52 is attached to the reel holding portion 22.

[0268] It is also possible that the wire tying 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 is also possible that when the pressing member 400 is pressed by the reinforcing 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. In addition, it is also possible that when the pressing member 400 is pressed by the reinforcing bar R, the control unit 82 executes Figure 22 the bundling process of S30.

Claims

1. A steel bar bundling machine that uses a wire to bundle steel bars, wherein, The steel bar bundling machine includes: A reel holding part that holds a reel with the wire in a manner that allows the reel to rotate about a reel rotation axis; A reel stopper that can be switched between a prohibited state where the reel is prohibited from detaching from the reel holding part and a permitted state where the reel is permitted to detach from the reel holding part; A first roller that can rotate; A second roller that can rotate, and the second roller can be switched between a first state where the wire is clamped between the first roller and the second roller and a second state where the distance between the first roller and the second roller is longer than the distance between the first roller and the second roller in the first state; And A twisting unit that twists the wire wound around the steel bar by the first roller and the second roller, When the reel stopper is switched from the prohibited state to the permitted state, the second roller is switched from the first state to the second state.

2. The steel bar bundling machine according to claim 1, wherein, When the second roller is in the second state, the wire is not clamped between the first roller and the second roller.

3. The steel bar bundling machine according to claim 1 or 2, wherein, When the reel stopper is switched from the permitted state to the prohibited state, the second roller is switched from the second state to the first state.

4. The steel bar bundling machine according to any one of claims 1 to 3, wherein, The reel holding part has a reel storage space inside for storing the reel.

5. The steel bar bundling machine according to any one of claims 1 to 4, wherein, The steel bar bundling machine further includes a link member that supports the second roller to be rotatable and switches the second roller between the first state and the second state, The reel stopper has an operating member, and when the reel stopper is switched from the prohibited state to the permitted state, the operating member operates the link member.

6. The steel bar bundling machine according to claim 5, wherein, The steel bar bundling machine further includes a biasing member that biases the link member to switch the second roller from the second state to the first state.

7. The steel bar bundling machine according to claim 6, wherein, The reel stopper can rotate between a first position where it is in the prohibited state and a second position where it is in the permitted state, The reel stopper rotates towards the first position when it is located closer to the first position than the neutral position between the first position and the second position, and rotates towards the second position when it is located closer to the second position than the neutral position.

8. The steel bar bundling machine according to any one of claims 5 to 7, wherein, The operating member includes a roller that can rotate and abuts against the link member.

9. The steel bar bundling machine according to any one of claims 5 to 8, wherein, The link member can rotate about a link rotation axis, The distance between the position of the link member operated by the drum stopper and the link rotation axis is longer than the distance between the position where the link member supports the second roller and the link rotation axis.

10. The steel bar bundling machine according to any one of claims 1 to 9, wherein the steel bar bundling machine further includes a locking lever for user operation, and the locking lever is mounted on the drum stopper, and the locking lever maintains the drum stopper in the prohibited state when engaged with the drum holding portion.

11. The steel bar bundling machine according to any one of claims 1 to 10, wherein the drum stopper is rotatable about a stopper rotation axis, and the stopper rotation axis is arranged at a position above the drum rotation axis and below the second roller.

12. The steel bar bundling machine according to any one of claims 1 to 11, wherein the steel bar bundling machine further includes: a drum pressing member mounted on the drum stopper; and a biasing member that biases the drum pressing member toward the drum when the drum stopper is in the prohibited state.

13. A steel bar bundling machine that bundles steel bars using a wire, wherein a drum holding portion that holds a drum having the wire so as to be rotatable about a drum rotation axis; a drum stopper that can be switched between a prohibited state of prohibiting the drum from detaching from the drum holding portion and an allowed state of allowing the drum to detach from the drum holding portion; a first roller that can rotate; a second roller that can rotate, and the second roller can be switched between a first state in which the wire is sandwiched between the first roller and the second roller and a second state in which the force of clamping the wire between the first roller and the second roller is smaller than the force of clamping the wire between the first roller and the second roller in the first state; and a twisting unit that twists the wire wound around the steel bar by the first roller and the second roller, when the drum stopper is switched from the prohibited state to the allowed state, the second roller is switched from the first state to the second state.

14. A steel bar bundling machine that bundles steel bars using a wire, wherein a drum holding portion that holds a drum having the wire so as to be rotatable about a drum rotation axis; a drum stopper that can be switched between a prohibited state of prohibiting the drum from detaching from the drum holding portion and an allowed state of allowing the drum to detach from the drum holding portion; and a locking lever that maintains the drum stopper in the prohibited state when engaged with the drum holding portion, after the drum stopper is switched from the allowed state to the prohibited state, the locking lever engages with the drum holding portion without being operated by the user.

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