End machine

Abstract

To provide a reinforcing-bar binding machine capable of preventing a wire from being hardly pulled out after binding.SOLUTION: In a reinforcing-bar binding machine, a cutter 8A1 for cutting a wire W comprises: a fixed blade 80A which has a first wire passage 83 formed therein for pass-through of the wire W; and a movable blade 81A1 which has a second wire passage 86A1 formed therein for pass-through of the wire W and cuts the wire W by sliding on an outer peripheral surface of the fixed blade 80A. The movable blade 81A1 comprises: a blade part 87A which is disposed on one side of the second wire passage 86A1 and slides along the outer peripheral surface of the fixed blade 80A; and a passage forming member 95A1 which is disposed on the other side of the second wire passage 86A1. The second wire passage 86A1 has a guide part 93A1 which is disposed in the passage forming member 95A1 and guides the wire W after cut through a moving operation of the movable blade 81A1 travelling toward the standby position. In the guide part 93A1, the second wire passage 86A1 is composed of a surface having recesses for forming unevenness so that the opening of the end on the downstream side along the feed direction of the wire W is larger in the interval along the rotating direction of the movable blade 81A1 than the opening of the end on the upstream side.SELECTED DRAWING: Figure 5A

Description

[Technical Field]

[0001] The present disclosure relates to a binding machine that binds objects such as reinforcing bars with wire. [Background technology]

[0002] BACKGROUND ART Conventionally, a binding machine known as a reinforcing bar binding machine has been proposed, which binds a plurality of reinforcing bars together by winding a wire around the reinforcing bars and twisting the wire.

[0003] In a conventional rebar binding machine of this type, a wire wound on a wire reel is fed toward the tip of the binding machine body by a feeding mechanism, and the fed wire is curled by a curl guide provided at the tip of the binding machine body. At this time, the wire is curled so as to surround the periphery of the rebar. The wire curled around the periphery of the rebar is cut by a cutter and then twisted by a twisting mechanism.

[0004] The cutter is composed of a fixed blade having a wire-through hole through which the wire can pass, a movable blade that slides on the outer periphery of the fixed blade, and a link member that drives the movable blade. To cut a wire, the movable blade is slid by the link member while the wire is passing through the wire-through hole. The movable blade is formed with an engaging portion that engages with the vicinity of the end of the cut wire and can bend and hold the vicinity of the end. The engaging portion is formed at an acute angle so that the wire can be bent and held. By holding the vicinity of the end of the wire, it is possible to prevent the vicinity of the end from getting caught and jammed between the curl guide and the cutter, or between the movable blade and the link member (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5309947 Summary of the Invention [Problem to be solved by the invention]

[0006] Although the engaging portion of the engaging part is formed at an acute angle to hold the vicinity of the end of the wire, the engaging portion gradually wears down with repeated use, and there is a possibility that the vicinity of the end of the wire will no longer be able to be held firmly. As a result, it is thought that the vicinity of the end of the wire may become caught and jammed between the curl guide and the cutter, or between the movable blade and the link member.

[0007] The present disclosure has been made to solve such problems, and aims to provide a binding machine that can prevent the end portion of a cut wire from getting caught and jammed between the curl guide and the cutter, or between the movable blade and the link member, etc. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides a cutting device including a wire feeding section that feeds a wire, a fixed blade that is provided downstream of the wire feeding section in a feeding direction of the wire fed by the wire feeding section and that forms a first wire passage through which the wire passes, and a movable blade that forms a second wire passage through which the wire passes and slides on an outer circumferential surface of the fixed blade to cut the wire, a first abutment section that is provided between the wire feeding section and the cutting section and on a first side of the wire feeding path and that can abut against the wire from the first side, and a second abutment section that is provided downstream of the cutting section and on a second side of the wire feeding path opposite the first side and that can abut against the wire from the second side. and a guide section that restricts the direction of travel of the wire and curls the wire by causing the second contact section to contact the wire in a state where the wire is in contact with the first contact section, the movable blade being movable between a standby position where the first wire passage and the second wire passage are connected and a movement end position where the first wire passage and the second wire passage are not connected, the opening of the second wire passage facing the guide section being wider toward the second side in the movement direction of the movable blade than the opening of the second wire passage facing the fixed blade, and having a recess on the downstream side of the widened portion, and the movable blade being equipped with a guide section that guides the wire after cutting when the movable blade moves from the movement end position to the standby position. The guide portion has an end portion that protrudes toward the guide portion when the movable blade is moved to the standby position, and the distance between the guide portion and the upstream end portion of the guide portion is less than the diameter of the wire.It is a binding machine.

[0009] In the present invention, when the movable blade moves to the standby position, the cut wire is guided by the guide portion. [Effects of the Invention]

[0010] In the present invention, even if the rear end of the wire cannot be held by the movable blade, the rear end of the wire is prevented from being pinched between the drive member and the guide portion. Also, the rear end of the wire is prevented from being pinched between the drive member and the movable blade. Therefore, the wire is prevented from being difficult to remove from the binding machine after binding, and work efficiency is improved. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is an overall configuration diagram seen from one side showing an example of a reinforcing bar binding machine according to an embodiment of the present invention. [Figure 2] FIG. 10 is a diagram showing the overall configuration of an example of a reinforcing bar binding machine according to the present embodiment, as viewed from another side. [Figure 3] FIG. 10 is a diagram showing an example of a conventional cutting section. [Figure 4A] 1A and 1B are diagrams illustrating the function and problems of a conventional cutting section. [Figure 4B] 1A and 1B are diagrams illustrating the function and problems of a conventional cutting section. [Figure 4C] 1A and 1B are diagrams illustrating the function and problems of a conventional cutting section. [Figure 4D] 1A and 1B are diagrams illustrating the function and problems of a conventional cutting section. [Figure 4E] 1A and 1B are diagrams illustrating the function and problems of a conventional cutting section. [Figure 4F] 1A and 1B are diagrams illustrating the function and problems of a conventional cutting section. [Figure 5A] 3 is a diagram showing a first example of a cutting unit of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 5B] 3 is a diagram showing a first example of a cutting unit of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 5C]3 is a diagram showing a first example of a cutting unit of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 5D] 3 is a diagram showing a first example of a cutting unit of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 6A] 10 is a diagram showing a second example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 6B] 10 is a diagram showing a second example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 6C] 10 is a diagram showing a second example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 6D] 10 is a diagram showing a second example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 7A] 10 is a diagram showing a third example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 7B] 10 is a diagram showing a third example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 7C] 10 is a diagram showing a third example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 7D] 10 is a diagram showing a third example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 8A] FIG. 10 is a diagram showing a fourth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 8B] FIG. 10 is a diagram showing a fourth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 8C] FIG. 10 is a diagram showing a fourth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 8D] FIG. 10 is a diagram showing a fourth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 9A]FIG. 10 is a diagram showing a fifth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 9B] FIG. 10 is a diagram showing a fifth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 9C] FIG. 10 is a diagram showing a fifth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 9D] FIG. 10 is a diagram showing a fifth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 10A] FIG. 10 is a diagram showing a sixth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 10B] FIG. 10 is a diagram showing a sixth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 10C] FIG. 10 is a diagram showing a sixth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 10D] FIG. 10 is a diagram showing a sixth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 10E] FIG. 10 is a diagram showing a sixth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 11A] FIG. 10 is a diagram showing a seventh example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 11B] FIG. 10 is a diagram showing a seventh example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 11C] FIG. 10 is a diagram showing a seventh example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 12A] 3 is a diagram showing a first example of a curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 12B] 3 is a diagram showing a first example of a curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 12C]3 is a diagram showing a first example of a curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 12D] 3 is a diagram showing a first example of a curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 12E] 3 is a diagram showing a first example of a curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 13A] FIG. 10 is a diagram showing a second example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 13B] FIG. 10 is a diagram showing a second example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 13C] FIG. 10 is a diagram showing a second example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 13D] FIG. 10 is a diagram showing a second example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 13E] FIG. 10 is a diagram showing a second example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 14A] 10 is a diagram showing a third example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 14B] 10 is a diagram showing a third example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 14C] 10 is a diagram showing a third example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 14D] 10 is a diagram showing a third example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 14E] 10 is a diagram showing a third example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. FIG. [Figure 15A] FIG. 10 is a diagram showing a fourth example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 15B] FIG. 10 is a diagram showing a fourth example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 15C] FIG. 10 is a diagram showing a fourth example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 15D] FIG. 10 is a diagram showing a fourth example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of the present embodiment. [Figure 16A] 10A and 10B are diagrams showing another embodiment of the reinforcing bar binding machine of the present embodiment. [Figure 16B] 10A and 10B are diagrams showing another embodiment of the reinforcing bar binding machine of the present embodiment. [Figure 16C] 10A and 10B are diagrams showing another embodiment of the reinforcing bar binding machine of the present embodiment. [Figure 16D] 10A and 10B are diagrams showing another embodiment of the reinforcing bar binding machine of the present embodiment. [Figure 17] FIG. 10 is a block diagram showing another embodiment of the reinforcing bar binding machine of the present embodiment. [Figure 18] 10 is a flowchart showing another embodiment of the reinforcing bar binding machine of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an example of a reinforcing bar binding machine as an embodiment of the binding machine of the present invention will be described with reference to the drawings.

[0013] <Configuration example of the reinforcing bar binding machine according to this embodiment> FIG. 1 is an overall configuration diagram of an example of a reinforcing bar binding machine of this embodiment, seen from one side, and FIG. 2 is an overall configuration diagram of an example of a reinforcing bar binding machine of this embodiment, seen from another side.

[0014] The reinforcing bar binding machine 1A includes a reel housing section 2A that rotatably houses a wire reel 20 around which one or more wires are wound, and a wire feeding section 3A that feeds the wire W wound on the wire reel 20 housed in the reel housing section 2A. The reinforcing bar binding machine 1A also includes a curl forming section 4A that curls the wire W fed by the wire feeding section 3A and wraps it around a reinforcing bar S. The reinforcing bar binding machine 1A also includes a binding section 5A that twists the wire W wound around the reinforcing bar S, and a braking section 6A that brakes the rotating wire reel 20 to restrict the rotation of the wire reel 20. The reinforcing bar binding machine 1A also includes a guide path 7 that guides the wire W, and a cutting section 8A that cuts the wire W.

[0015] The reinforcing bar binding machine 1A is provided with a handle portion 10a protruding from a main body portion 10. The reinforcing bar binding machine 1A is also provided with a curl forming portion 4A on one side of the handle portion 10a, and a reel storage portion 2A on the other side. In the following description, the side of the main body portion 10 of the reinforcing bar binding machine 1A on which the handle portion 10a is provided is referred to as the bottom, and the side opposite the handle portion 10a is referred to as the top. The side on which the curl forming portion 4A is provided is defined as the front, and the side on which the reel storage portion 2A is provided is defined as the rear.

[0016] The reel housing 2A is configured to be able to attach, detach, and support the wire reel 20. The wire feeding unit 3A has a pair of feed gears 30 as feed members. The pair of feed gears 30 are arranged on either side of the feed path of the wire W. The wire feeding unit 3A has a feed motor 31 that drives the feed gear 30, and a gear 32 that transmits the rotation of the feed motor 31 to the feed gear 30. With the wire W sandwiched between the pair of feed gears 30, the wire feeding unit 3A rotates the feed gear 30 to feed the wire W toward the curl forming unit 4A.

[0017] The curl forming unit 4A is provided with a guide unit 40 that contacts the wire W fed by the wire feeding unit 3A and regulates the direction of travel of the wire W. The curl forming unit 4A guides the wire W so that the wire W draws an approximate circle around the reinforcing bar S, thereby forming a curl in the wire W (curling the wire W).

[0018] The curl forming unit 4A is provided between the feed gear 30 of the wire feed unit 3A and the cutting unit 8A, on a first side of the feed path of the wire W indicated by the two-dot chain line, and includes a wire guide 42 that can contact the wire W from the first side. The wire guide 42 is an example of a first contact portion. The curl forming unit 4A is also provided downstream of the cutting unit 8A, on a second side of the feed path of the wire W opposite the first side, and includes a wire guide 43 that can contact the wire W from the second side. The wire guide 43 is an example of a second contact portion. The wire guide 43 is provided at an end 45a downstream of a wire sliding surface 44 of the guide unit 40 that contacts the wire W, along the feed direction of the wire W, and protrudes from the wire sliding surface 44. The curl forming unit 4A is provided on the upstream side of the wire guide 42 and on the second side of the feed path of the wire W, and includes a wire guide 41 that can contact the wire W from the second side. The first side is the radially inner side of the curled wire W, and the second side is the radially outer side of the curled wire W.

[0019] To curl the wire W, it is sufficient to have at least wire guide 42 and wire guide 43, but to more reliably curl the wire W, it is preferable to have wire guide 41, wire guide 42, and wire guide 43. The wire sliding surface 44 also contributes to curling the wire W, but is not necessarily an essential component.

[0020] The binding unit 5A includes a torsion motor 51, a gear 52, a screw shaft portion 53, a reciprocating cylinder portion 54, and a torsion hook 55. The torsion motor 51, which is driven separately from the feed motor 31, is used as the drive source of the binding unit 5A.

[0021] The threaded shaft portion 53 is rotatably supported relative to the main body portion 10, and rotates by the driving force of the torsion motor 51 transmitted via the gear 52. The threaded shaft portion 53 has a thread formed on its outer circumferential surface, and the retractable cylinder portion 54 has a thread formed on its inner circumferential surface, so that the threads on the outer circumferential surface of the threaded shaft portion 53 are threadedly engaged with the threads on the inner circumferential surface of the retractable cylinder portion 54.

[0022] The binding part 5A is configured so that, with the rotation of the advancing / retreating cylinder part 54 restricted, the threaded shaft part 53 rotates due to the rotation of the torsion motor 51, causing the advancing / retreating cylinder part 54 to move back and forth. In addition, the threaded shaft part 53 and the advancing / retreating cylinder part 54 are coupled so as to rotate integrally, so that the rotation of the threaded shaft part 53 due to the rotation of the torsion motor 51 causes the advancing / retreating cylinder part 54 to rotate.

[0023] The twisting hooks 55 are a pair of claw-shaped members attached to the tip of the retractable cylindrical portion 54. The twisting hooks 55 are configured to open and close in accordance with the retractable movement of the retractable cylindrical portion 54 using a known structure.

[0024] The braking unit 6A includes a reel brake 60 that can engage with the wire reel 20, and a solenoid 61 that drives the reel brake 60. The reel brake 60 includes an engaging portion 62 at one end that engages with the engaged portion 20a of the wire reel 20. The other end of the reel brake 60, opposite the end where the engaging portion 62 is provided, is attached to a shaft 63, and the reel brake 60 is rotatably supported by the main body 10 via the shaft 63.

[0025] The solenoid 61 is operated by an electromagnet, a spring, etc. (not shown), and is connected to a link 64 attached to a shaft 63. The braking portion 6A moves by rotating about the shaft 63 as a fulcrum between a braking position where the engaging portion 62 of the reel brake 60 engages with the engaged portion 20a of the wire reel 20 and a retracted position where the engaging portion 62 of the reel brake 60 is separated from the wire reel 20.

[0026] The wire reel 20 rotates in response to the wire feed unit 3A feeding the wire W. Therefore, even after the wire feed unit 3A stops feeding the wire W, the wire reel 20 tends to continue rotating due to inertia.

[0027] Therefore, in the braking unit 6A, the solenoid 61 is activated in conjunction with the wire feeding unit 3A stopping the feeding of the wire W, and the engaging unit 62 of the reel brake 60 moves from the retracted position to the braking position.

[0028] As a result, in conjunction with the wire feeding unit 3A stopping the feeding of the wire W, the engaging portion 62 of the reel brake 60 engages with the engaged portion 20a of the wire reel 20, stopping the rotation of the wire reel 20. Therefore, after the wire feeding unit 3A stops the feeding of the wire W, the rotation of the wire reel 20 due to inertia is restricted.

[0029] The guide path 7 is provided upstream of the cutting section 8A in the feeding direction of the wire W, and constitutes a path for guiding the wire W fed by the wire feeding section 3A to the cutting section 8A.

[0030] The cutting unit 8A includes a fixed blade 80A fixed to the guide frame 11, a movable blade 81A rotatable relative to the fixed blade 80A, and a drive member 82A that rotates the movable blade 81A. Details of the cutting unit 8A of this embodiment will be described later.

[0031] <Example of operation of the reinforcing bar binding machine according to this embodiment> Next, with reference to the respective drawings, an operation of binding a reinforcing bar S using a wire W with the reinforcing bar binding machine 1A of this embodiment will be described.

[0032] When the trigger 10t of the rebar binding machine 1A is operated, the feed motor 31 is driven, causing the wire W to be fed by a predetermined amount by the wire feeding unit 3A, and then wound around the rebar S by the curl forming unit 4A. The number of times the wire W is wound around the rebar S is set by the amount of wire W fed. The wire reel 20 rotates in response to the feeding of the wire W as the wire W is fed by the wire feeding unit 3A. By stopping the feed motor 31, after the feeding operation of the wire W by the wire feeding unit 3A has finished, the wire reel 20, which has been rotating in response to the feeding of the wire W, is braked by the braking unit 6A, and the rotation of the wire reel 20 is restricted.

[0033] In the binding unit 5A, the torsion motor 51 rotates forward, and the rotation of the torsion motor 51 is transmitted to the threaded shaft 53 via the gear 52. At this time, the threaded shaft 53 rotates, but the rotation of the retractable cylindrical part 54 is restricted, so the retractable cylindrical part 54 is sent forward by the action of the engaged screw. As the retractable cylindrical part 54 is sent forward, the cutting unit 8A is actuated to cut the wire W. In addition, the twisting hook 55 advances to a position where it comes into contact with the wire W. The twisting hook 55 operates in a closing direction in conjunction with the advancement of the retractable cylindrical part 54, and grasps a portion of the wire wound into a loop.

[0034] The advance / retract cylinder portion 54 is released from the restriction on rotation when it advances to a predetermined position, and rotates together with the threaded shaft portion 53. The twisting hook 55 gripping the wire W rotates, causing the wire W to be twisted.

[0035] When the twisting operation is completed, the twisting motor 51 rotates in the reverse direction, causing the screw shaft 53 to rotate in the reverse direction. As a result, the retractable cylinder 54 and the twisting hook 55 also move backward, and the twisting hook 55 opens and releases the wire W. The twisting motor 51 rotates in the reverse direction until the retractable cylinder 54 and the twisting hook 55 move to the standby position. When the retractable cylinder 54 and the twisting hook 55 move to the standby position, the twisting motor 51 stops, completing the series of operations. As a result, the rebar S is bound with the wire W.

[0036] <Example of a problem with the reinforcing bar binding machine according to this embodiment> Next, a description will be given of the configuration of a conventional cutting unit 8 that cuts the wire W. Fig. 3 is a diagram showing an example of a conventional cutting unit. The cutting unit 8 includes a fixed blade 80 fixed to a guide frame 11, a movable blade 81 rotatable relative to the fixed blade 80, and a drive member 82 that rotates the movable blade 81.

[0037] The fixed blade 80 is provided on the feed path of the wire W passing through the guide path 7. The fixed blade 80 is made up of a cylindrical member, and is erected from the guide frame 11 so that the axial direction of the cylindrical shape is perpendicular to the feed direction of the wire W. In addition, the fixed blade 80 has a first wire passage 83, through which the wire W passes, formed to penetrate the cylindrical shape in the radial direction.

[0038] The first wire passage 83 extends along the feed path of the wire W, and its upstream end in the feed direction of the wire W opens toward the end 7b of the guide passage 7. Furthermore, the first wire passage 83 has its downstream end in the feed direction of the wire W open toward the guide portion 40, and a blade portion 84 is formed at the edge of the opening at the downstream end in the feed direction of the wire W. Furthermore, the diameter of the first wire passage 83 is configured to be larger than the diameter of the wire W.

[0039] The movable blade 81 has an axial hole portion 85 that is inserted into the fixed blade 80, a second wire passage 86 through which the wire W passes, a blade portion 87 that slides along the outer surface of the fixed blade 80, and a connecting portion 88 to which the drive member 82 is connected.

[0040] The shaft hole portion 85 is configured as an opening with an inner diameter that is approximately the same as the outer diameter of the fixed blade 80 or slightly larger than the outer diameter of the fixed blade 80. When the fixed blade 80 is inserted into the shaft hole portion 85, the movable blade 81 is supported rotatably with the fixed blade 80 as a fulcrum.

[0041] The second wire passage 86 is composed of an opening such as a groove or hole through which the wire W passes. When the movable blade 81 is in the standby position shown in FIG. 3, the second wire passage 86 is connected to the first wire passage 83 of the fixed blade 80, and the wire W passes through the second wire passage 86 before being cut. In addition, the second wire passage 86 guides the cut wire W to a path that allows it to exit the cutting portion 80 by the operation of the movable blade 81 after cutting the wire W.

[0042] The blade portion 87 is provided in the second wire passage 86 along the inner circumferential surface of the shaft hole 85, and slides along the outer circumferential surface of the fixed blade 80 as the movable blade 81 rotates around the fixed blade 80 as a fulcrum. When the movable blade 81 rotates in the cutting direction indicated by arrow F from the standby position shown in FIG. 3 , the blade portion 87 moves in a direction approaching the blade portion 84 of the fixed blade 80. As a result, the wire W passed through the first wire passage 83 of the fixed blade 80 is sandwiched between the blade portion 84 of the fixed blade 80 and the blade portion 87 of the movable blade 81 and cut. When the movable blade 81 rotates in the retraction direction indicated by arrow R, the blade portion 87 moves in a direction away from the blade portion 84 of the fixed blade 80, and the second wire passage 86 of the movable blade 81 and the first wire passage 83 of the fixed blade 80 are connected.

[0043] The connecting portion 88 is formed at a location opposite to the shaft hole portion 85, and the driving member 82 is rotatably connected thereto.

[0044] The driving member 82 is connected to the forward / backward moving cylinder portion 54 driven by the torsion motor 51 shown in FIG. 2 via a link 89 or the like, and moves along the extension direction of the screw shaft portion 53 with linear and rotational motion.

[0045] As a result, the movement of the forward / backward moving cylinder portion 54, which moves back and forth along the screw shaft portion 53, is transmitted to the movable blade 81 via the link 89 and the drive member 82, and the movable blade 81 rotates in the cutting direction indicated by arrow F and in the retracting direction indicated by arrow R with the fixed blade 80 as the fulcrum.

[0046] Next, the function and problems of a conventional cutting unit will be described. Figures 4A to 4F are diagrams showing the function and problems of a conventional cutting unit. As shown in Figure 4A, an engagement portion 90 capable of holding the rear end WE of the wire W cut by the cutting unit 8 is formed in the second wire passage 86 of the movable blade 81. That is, the engagement portion 90 is composed of a first engagement surface 91 capable of engaging with the underside of the wire W that has passed through the first wire passage 83 during cutting, and a second engagement surface 92 formed at an acute angle from the tip of the first engagement surface 91 and capable of engaging with the underside of the wire W after the wire W has been cut.

[0047] According to the above configuration, after the wire W is curled by the curl forming unit 4A and wound around the reinforcing bar, the cutting unit 8 is activated and the movable blade 81 rotates, cutting the wire W and causing the first engagement surface 91 of the engagement unit 90 to engage with the vicinity of the rear end WE of the wire W and push it up. Although a portion of the wire W abuts against the wire sliding surface 44 of the guide unit 40, it cannot be pushed up any further, so the vicinity of the rear end WE of the wire W is bent by the tip of the first engagement surface 91.

[0048] As a result, as shown in Figure 4B, even if a pulling force is applied to the wire W wound around the reinforcing bar S by twisting the wire W at the binding portion 5A, the rear end portion WE of the wire W is caught on the tip of the first engagement surface 91 and is held in an engaged state with the second engagement surface 92.

[0049] Therefore, when the twisting action of the wire W by the binding portion 5A is completed and the movable blade 81 rotates in the retraction direction indicated by the arrow R in conjunction with the return action of the binding portion 5A as shown in Figure 4C, the rear end portion WE of the wire W is pushed back by the second wire passage 86 of the movable blade 81, and the cut wire W can be guided to a path that allows it to be removed from the cutting portion 8.

[0050] However, if the tip of the above-mentioned first engagement surface 91 wears, the first engagement surface 91 will no longer be able to hold the wire W, and when a pulling force is applied to the wire W by twisting the wire W wound around the reinforcing bar S at the binding portion 5A, the wire W may move from the position indicated by the dotted line to the position indicated by the embodiment, as shown in Figure 4D.

[0051] If the rear end WE of the wire W cannot be held by the movable blade 81, the rear end WE of the wire W may be pinched between the drive member 82 and the guide part 40 as the movable blade 81 rotates in the retracting direction indicated by the arrow R, as shown in Fig. 4E. Also, as shown in Fig. 4F, the rear end WE of the wire W may be pinched between the drive member 82 and the movable blade 81. If this happens, the wire W becomes difficult to remove after bundling, reducing work efficiency.

[0052] Therefore, in the reinforcing bar binding machine 1A of this embodiment, the configuration of the cutting unit 8A, the configuration of the curl forming unit 4A, and the control of the cutting unit 8A prevent the wire W from being pinched after cutting.

[0053] <An example of the cutting unit according to the first embodiment> 5A to 5D are diagrams showing a first example of the cutting unit of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0054] As shown in FIG. 5A, the cutting section 8A1 of the first example of the first embodiment includes a fixed blade 80A fixed to the guide frame 11, a movable blade 81A1 rotatable relative to the fixed blade 80A, and a driving member 82A that rotates the movable blade 81A1.

[0055] The fixed blade 80A is provided on the feed path of the wire W passing through the guide path 7. The fixed blade 80A is made up of a cylindrical member, and stands upright from the guide frame 11 with the axial direction of the cylindrical shape perpendicular to the feed direction of the wire W. In addition, the fixed blade 80A has a first wire passage 83A, through which the wire W passes, penetrating the cylindrical shape in the radial direction.

[0056] The first wire passage 83A is composed of an opening such as a groove or hole through which the wire W passes, and extends along the feed path of the wire W passing through the guide passage 7, with its upstream end in the feed direction of the wire W opening toward the end 7b of the guide passage 7. Furthermore, the first wire passage 83A has its downstream end in the feed direction of the wire W opening toward the guide section 40 of the curl forming section 4A, and a blade portion 84A is formed at the edge of the opening at the downstream end in the feed direction of the wire W. Furthermore, the diameter of the first wire passage 83A is configured to be slightly larger than the diameter of the wire W.

[0057] 1, a movable blade 81A1 is a first embodiment of the movable blade 81A and includes an axial hole 85A into which the fixed blade 80A is inserted, and a second wire passage 86A1 through which the wire W passes. The movable blade 81A1 also includes a blade portion 87A that is provided on one side of the second wire passage 86A1 and slides along the outer peripheral surface of the fixed blade 80A, and a passage forming member 95A1 that is provided on the other side of the second wire passage 86A1, i.e., on the side opposite to the blade portion 87A. The movable blade 81A1 also includes a connecting portion 88A to which the drive member 82A is connected.

[0058] The shaft hole portion 85A is configured with an opening having an inner diameter that is approximately the same as or slightly larger than the outer diameter of the fixed blade 80A. The fixed blade 80A is inserted into the shaft hole portion 85A, so that the movable blade 81A1 is rotatably supported around the fixed blade 80A as a fulcrum.

[0059] The second wire passage 86A1 is formed of an opening such as a groove or hole through which the wire W passes. When the movable blade 81A1 is in the standby position shown in FIG. 5A, the second wire passage 86A1 is connected to the first wire passage 83A of the fixed blade 80A and forms a wire W feed path through which the wire W passes before being cut. When the movable blade 81A1 is in the standby position, one side of the second wire passage 86A1 is a first side with respect to the wire W feed path. The other side of the second wire passage 86A1 is always a second side with respect to the wire W feed path. When the movable blade 81A1 is in the standby position, a blade portion 87A is provided on the first side with respect to the wire W feed path. Furthermore, a path forming member 95A1 that forms the second wire passage 86A1 is provided on a second side of the movable blade 81A1 opposite to the first side. Furthermore, when the movable blade 81A1 is in the rotation end position, which is the movement end position shown in FIG. 5B, the second wire passage 86A1 is not in communication with the first wire passage 83A of the fixed blade 80A.

[0060] The second wire passage 86A1 includes a guide portion 93A1 that guides the cut wire W to a path that allows it to be removed from the cutting portion 8A1 by the rotational action of the movable blade 81A1 moving to the standby position after cutting the wire W. The guide portion 93A1 is provided in the passage forming member 95A1.

[0061] The guide portion 93A1 is formed with an uneven surface so that the gap between the opening at the downstream end of the second wire passage 86A1 in the direction of rotation of the movable blade 81A1 is larger than the gap between the opening at the upstream end along the feed direction of the wire W. The guide portion 93A1 widens toward the second side along the movement direction of the movable blade 81A1 when the movable blade 81A1 is in the standby position. The guide portion 93A1 may be formed with a curved surface, a combination of flat surfaces and corners, or a combination of flat surfaces and curved surfaces.

[0062] The guide section 93A1 rotates around the fixed blade 80A as a fulcrum, and when the movable blade 81A1 moves to the standby position shown in Figures 5A and 5D, the end 94A1 of the passage forming member 95A1 on the downstream side along the feed direction of the wire W, which is opposite the guide section 40 and is located on the second wire passage 86A1, is in a position that approximately coincides with the wire sliding surface 44 of the guide section 40.

[0063] Furthermore, when the movable blade 81A1 is moved to the standby position, the end 94A1 of the guide portion 93A1 protrudes toward the guide portion 40. When the movable blade 81A1 is moved to the standby position, the distance between the end 94A1 of the guide portion 93A1 and the end 45b of the guide portion 40 on the upstream side along the feeding direction of the wire W and facing the cutting portion 8A1 is less than the diameter of the wire W.

[0064] As a result, when the movable blade 81A1 is moved to the standby position, the end 45b of the guide portion 40 is covered by the guiding portion 93A1. Furthermore, if the guiding portion 93A1 is provided with an end 94A1 that protrudes toward the guide portion 40, the end 45b of the guide portion 40 is covered by the end 94A1.

[0065] The blade portion 87A is provided in the second wire passage 86A1 along the inner peripheral surface of the shaft hole portion 85A, and slides along the outer peripheral surface of the fixed blade 80A as the movable blade 81A1 rotates around the fixed blade 80A as a fulcrum.

[0066] When movable blade 81A1 rotates in the cutting direction indicated by arrow F from the standby position shown in Fig. 5A, blade portion 87A moves in a direction approaching blade portion 84A of fixed blade 80A. As a result, wire W passed through first wire passage 83A of fixed blade 80A is sandwiched between blade portion 84A of fixed blade 80A and blade portion 87A of movable blade 81A1 and cut. By rotating a predetermined amount further in the cutting direction from the cutting completion position where wire W is cut, movable blade 81A1 moves to the rotation end position shown in Fig. 5B.

[0067] Furthermore, when the movable blade 81A1 rotates in the retraction direction indicated by arrow R from the end position of rotation shown in Figure 5B, the blade portion 87A moves in a direction that opens the first wire passage 83A of the fixed blade 80A and away from the blade portion 84A of the fixed blade 80A, connecting the second wire passage 86A1 of the movable blade 81A1 and the first wire passage 83A of the fixed blade 80A.

[0068] The connecting portion 88A is formed at a location opposite to the shaft hole portion 85A, and the driving member 82A is rotatably connected thereto.

[0069] The driving member 82A is connected to the forward / backward moving cylinder portion 54 driven by the torsion motor 51 shown in FIG. 2 via a link 89A etc., and moves along the extension direction of the screw shaft portion 53 with linear and rotational motion.

[0070] As a result, the movement of the advancing / retreating cylinder portion 54, which moves back and forth along the screw shaft portion 53, is transmitted to the movable blade 81A1 via the drive member 82A and link 89A, and the movable blade 81A1 rotates in the cutting direction indicated by arrow F and in the retracting direction indicated by arrow R with the fixed blade 80A as a fulcrum.

[0071] When the tip of the first engagement surface 91 shown in Figure 4A is worn, if a pulling force is applied to the wire W wound around the reinforcing bar S by twisting the wire W at the binding portion 5A, it may be impossible to hold the rear end WE of the wire W with the movable blade 81A1, as shown in Figure 5B.

[0072] In contrast, in a configuration in which the movable blade 81A1 is provided with the above-mentioned guide portion 93A1, when the movable blade 81A1 is in the rotation end position shown in Figure 5B, the distance between the end 94A1 of the guide portion 93A1 and the end 45b of the guide portion 40 is larger than the distance between the second wire passage 86 and the end 45b of the guide portion 40 in a conventional movable blade 81 that does not have the guide portion 93A1.

[0073] As a result, even if the movable blade 81A1 is in the rotation end position shown in Figure 5B and is unable to hold the rear end portion WE of the wire W, when the movable blade 81A1 rotates in the retraction direction indicated by arrow R as shown in Figure 5C, the rear end portion WE of the wire W comes into contact with the guide portion 93A1, and is guided into the second wire passage 86A1 by the rotation of the movable blade 81A1.

[0074] Then, as shown in FIG. 5D, when the movable blade 81A1 rotates to the standby position, the rear end WE of the wire W is guided into the second wire passage 86A1, and the end 45b of the guide portion 40 is covered by the guide portion 93A1.

[0075] Therefore, even if the rear end WE of the wire W cannot be held by the movable blade 81A1, the rear end WE of the wire W is prevented from being pinched between the drive member 82A and the end 45b of the guide part 40. Also, the rear end WE of the wire W is prevented from being pinched between the drive member 82A and the movable blade 81A1. Therefore, the wire W is prevented from becoming difficult to remove after bundling, improving work efficiency.

[0076] 6A to 6D are diagrams showing a second example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0077] As shown in Figure 6A, the cutting section 8A2 of the second example of the first embodiment has a different configuration of the movable blade 81A2 from the cutting section 8A1 of the first example described above. Therefore, the following will describe the details of the movable blade 81A2, and the other components will be assigned the same numbers as the cutting section 8A1 of the first example, and detailed descriptions of the components will be omitted.

[0078] 1, the movable blade 81A2 is a second embodiment of the movable blade 81A and includes an axial hole 85A into which the fixed blade 80A is inserted, and a second wire passage 86A2 through which the wire W passes. The movable blade 81A2 also includes a blade portion 87A that is provided on one side of the second wire passage 86A2 and slides along the outer peripheral surface of the fixed blade 80A, and a passage forming member 95A2 that is provided on the other side of the second wire passage 86A2, i.e., the side opposite to the blade portion 87A. The movable blade 81A2 also includes a connecting portion 88A to which the drive member 82A is connected.

[0079] The second wire passage 86A2 is formed of an opening such as a groove or hole through which the wire W passes. When the movable blade 81A2 is in the standby position shown in FIG. 6A , the second wire passage 86A2 is connected to the first wire passage 83A of the fixed blade 80A and forms a wire W feed path through which the wire W passes before being cut. When the movable blade 81A2 is in the standby position, one side of the second wire passage 86A2 is a first side with respect to the wire W feed path. The other side of the second wire passage 86A2 is always a second side with respect to the wire W feed path. When the movable blade 81A2 is in the standby position, a blade portion 87A is provided on the first side with respect to the wire W feed path. Furthermore, a path forming member 95A2 that forms the second wire passage 86A2 is provided on a second side of the movable blade 81A2 opposite to the first side. Furthermore, when the movable blade 81A2 is in the rotation end position, which is the movement end position shown in FIG. 6B, the second wire passage 86A2 is not in communication with the first wire passage 83A of the fixed blade 80A.

[0080] The second wire passage 86A2 includes a guide portion 93A2 that guides the cut wire W to a path that allows it to be removed from the cutting portion 8A2 by the rotational action of the movable blade 81A2 moving to the standby position after cutting the wire W. The guide portion 93A2 is provided in the passage forming member 95A2.

[0081] The guide portion 93A2 is formed with an uneven surface so that the gap between the opening at the downstream end of the second wire passage 86A2 in the direction of rotation of the movable blade 81A2 is larger than the gap between the opening at the upstream end in the feed direction of the wire W. The guide portion 93A2 widens toward the second side in the direction of movement of the movable blade 81A1 when the movable blade 81A1 is in the standby position. The guide portion 93A2 may be formed with a curved surface, a combination of flat surfaces and corners, or a combination of flat surfaces and curved surfaces.

[0082] The guide section 93A2 rotates around the fixed blade 80A as a fulcrum, and when the movable blade 81A2 moves to the standby position shown in Figures 6A and 6D, the end 94A2 of the passage forming member 95A2 on the side facing the guide section 40, downstream along the feed direction of the wire W, is in a position where it protrudes inward from the wire sliding surface 44 of the guide section 40.

[0083] Furthermore, when the movable blade 81A2 is moved to the standby position, the end 94A2 of the guide portion 93A2 protrudes toward the guide portion 40. When the movable blade 81A2 is moved to the standby position, the distance between the end 94A2 of the guide portion 93A2 and the end 45b of the guide portion 40 on the upstream side along the feeding direction of the wire W and facing the cutting portion 8A2 is less than the diameter of the wire W.

[0084] As a result, when the movable blade 81A2 is moved to the standby position, the end 45b of the guide portion 40 is covered by the end 94A2 of the induction portion 93A2.

[0085] In a configuration in which the movable blade 81A2 is provided with the above-mentioned guide portion 93A2, when the movable blade 81A2 is in the rotation end position shown in Figure 6B, the distance between the end 94A2 of the guide portion 93A2 and the end 45b of the guide portion 40 is larger than the distance between the second wire passage 86 and the end 45b of the guide portion 40 in a conventional movable blade 81 that does not have the guide portion 93A2.

[0086] As a result, even if the movable blade 81A2 is in the rotation end position shown in Figure 6B and is unable to hold the rear end portion WE of the wire W, when the movable blade 81A2 rotates in the retraction direction indicated by arrow R as shown in Figure 6C, the rear end portion WE of the wire W comes into contact with the guiding portion 93A2 or the end portion 94A2 of the guiding portion 93A2, and is guided into the second wire passage 86A2 by the rotation of the movable blade 81A2.

[0087] Then, as shown in Figure 6D, when the movable blade 81A2 rotates to the standby position, the rear end WE of the wire W is guided into the second wire passage 86A2, and the end 45b of the guide portion 40 is covered by the end 94A2 of the guide portion 93A2.

[0088] Therefore, even if the rear end WE of the wire W cannot be held by the movable blade 81A2, the rear end WE of the wire W is prevented from being pinched between the drive member 82A and the end 45b of the guide part 40. Also, the rear end WE of the wire W is prevented from being pinched between the drive member 82A and the movable blade 81A2. Therefore, the wire W is prevented from becoming difficult to remove after bundling, improving work efficiency.

[0089] 7A to 7D are diagrams showing a third example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0090] As shown in Figure 7A, the cutting section 8A3 of the third example of the first embodiment has a different configuration of the movable blade 81A3 from the cutting section 8A1 of the first example described above. Therefore, the following will describe the details of the movable blade 81A3, and the other components will be assigned the same numbers as the cutting section 8A1 of the first example, and detailed descriptions of the components will be omitted.

[0091] 1, a movable blade 81A3 which is a third embodiment of the movable blade 81A includes an axial hole 85A into which the fixed blade 80A is inserted and a second wire passage 86A3 through which the wire W passes. The movable blade 81A3 also includes a blade portion 87A which is provided on one side of the second wire passage 86A3 and slides along the outer peripheral surface of the fixed blade 80A, and a passage forming member 95A3 which is provided on the other side of the second wire passage 86A3, i.e., on the side opposite to the blade portion 87A. The movable blade 81A3 also includes a connecting portion 88A to which the drive member 82A is connected.

[0092] The second wire passage 86A3 is formed of an opening such as a groove or hole through which the wire W passes. When the movable blade 81A3 is in the standby position shown in FIG. 7A , the second wire passage 86A3 is connected to the first wire passage 83A of the fixed blade 80A and forms a wire W feed path through which the wire W passes before being cut. When the movable blade 81A3 is in the standby position, one side of the second wire passage 86A3 is a first side with respect to the wire W feed path. The other side of the second wire passage 86A3 is always a second side with respect to the wire W feed path. When the movable blade 81A3 is in the standby position, a blade portion 87A is provided on the first side with respect to the wire W feed path. Furthermore, a path forming member 95A3 that forms the second wire passage 86A3 is provided on a second side of the movable blade 81A3 opposite to the first side. Furthermore, when the movable blade 81A3 is in the rotation end position, which is the movement end position shown in FIG. 6B, the second wire passage 86A3 is not in communication with the first wire passage 83A of the fixed blade 80A.

[0093] The second wire passage 86A3 includes a guide portion 93A3 that guides the cut wire W to a path that allows it to be removed from the cutting portion 8A3 by the rotational action of the movable blade 81A3 moving to the standby position after cutting the wire W. The guide portion 93A3 is provided in the passage forming member 95A3.

[0094] 7A and 7D, an end portion 94A3 of the passage forming member 95A3 facing the guide portion 40 on the downstream side along the feed direction of the wire W protrudes toward the guide portion 40. As a result, the second wire passage 86A3 extends toward the guide portion 40, forming the guide portion 93A3.

[0095] When the movable blade 81A3 is moved to the standby position, the distance between the end 94A3 of the guide portion 93A3 and the end 45b of the guide portion 40, which is upstream along the feed direction of the wire W and faces the cutting portion 8A3, is less than the diameter of the wire W.

[0096] As a result, when the movable blade 81A3 is moved to the standby position, the end 45b of the guide portion 40 is covered by the end 94A3 of the induction portion 93A3.

[0097] In a configuration in which the movable blade 81A3 is provided with the above-mentioned guide portion 93A3, when the movable blade 81A3 rotates in the retraction direction indicated by arrow R from the state in which it is in the rotation end position shown in Figure 6B and the rear end portion WE of the wire W comes into contact with the end portion 94A3 of the guide portion 93A3, the end portion 94A3 tilts in a direction in which a force is applied to guide the wire W toward the second wire passage 86A3.

[0098] As a result, even if the rear end portion WE of the wire W cannot be held when the movable blade 81A3 is in the rotation end position shown in Fig. 7B, when the movable blade 81A3 rotates in the retraction direction indicated by arrow R, the rear end portion WE of the wire W comes into contact with the guide portion 93A3 and is guided into the second wire passage 86A3 by the rotation of the movable blade 81A3. Also, even if the rear end portion WE of the wire W is not guided into the second wire passage 86A3 as shown in Fig. 7C, the rear end portion WE of the wire W comes into contact with the end portion 94A4 of the guide portion 93A3, and the rear end portion WE of the wire W is pushed out by the end portion 94A4.

[0099] Then, as shown in FIG. 7D, when the movable blade 81A3 rotates to the standby position, the end 45b of the guide portion 40 is covered by the end 94A3 of the leading portion 93A3.

[0100] Therefore, even if the rear end WE of the wire W cannot be held by the movable blade 81A3, the rear end WE of the wire W is prevented from being pinched between the drive member 82A and the end 45b of the guide part 40. Also, the rear end WE of the wire W is prevented from being pinched between the drive member 82A and the movable blade 81A3. Therefore, the wire W is prevented from becoming difficult to remove after bundling, improving work efficiency.

[0101] 8A to 8D are diagrams showing a fourth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0102] As shown in Figure 8A, the cutting section 8A4 of the fourth example of the first embodiment has a different configuration of the movable blade 81A4 from the cutting section 8A1 of the first example described above. Therefore, the following will describe the details of the movable blade 81A4, and the other components will be assigned the same numbers as the cutting section 8A1 of the first example, and detailed descriptions of the components will be omitted.

[0103] 1, a movable blade 81A4 which is a fourth embodiment of the movable blade 81A includes an axial hole 85A into which the fixed blade 80A is inserted, and a second wire passage 86A4 through which the wire W passes. The movable blade 81A4 also includes a blade portion 87A which is provided on one side of the second wire passage 86A4 and slides along the outer peripheral surface of the fixed blade 80A, and a passage forming member 95A4 which is provided on the other side of the second wire passage 86A4, i.e., on the side opposite to the blade portion 87A. The movable blade 81A4 also includes a connecting portion 88A to which the drive member 82A is connected.

[0104] The second wire passage 86A4 is formed of an opening such as a groove or hole through which the wire W passes. When the movable blade 81A4 is in the standby position shown in FIG. 8A , the second wire passage 86A4 is connected to the first wire passage 83A of the fixed blade 80A and forms a wire W feed path through which the wire W passes before being cut. When the movable blade 81A4 is in the standby position, one side of the second wire passage 86A4 is a first side with respect to the wire W feed path. The other side of the second wire passage 86A4 is always a second side with respect to the wire W feed path. When the movable blade 81A4 is in the standby position, a blade portion 87A is provided on the first side with respect to the wire W feed path. Furthermore, a path forming member 95A4 that forms the second wire passage 86A4 is provided on a second side of the movable blade 81A4 opposite to the first side. Furthermore, when the movable blade 81A4 is in the rotation end position, which is the movement end position shown in FIG. 8B, the second wire passage 86A4 is not in communication with the first wire passage 83A of the fixed blade 80A.

[0105] The cutting unit 8A4 includes a discharge guide portion 96A4 that guides the discharge of the wire W sandwiched between the movable blade 81A4 and the drive member 82A. The discharge guide portion 96A4 is provided on a surface of the passage forming member 95A4 that faces the drive member 82A, which is connected to the movable blade 81A4 by the connecting portion 88A. The movable blade 81A4 and the drive member 82A rotate about the fixed blade 80A as a fulcrum, and face the guide portion 40 when the movable blade 81A4 moves to the standby position shown in FIGS. 8A and 8D. The discharge guide portion 96A4 is configured as a surface that widens toward the guide portion 40, with an opening between the passage forming member 95A4 and the drive member 82A of the movable blade 81A4 being equal to or larger than the diameter of the wire W when the movable blade 81A4 moves to the standby position. The discharge guide portion 96A4 may be configured as a curved surface, a flat surface, or an uneven surface.

[0106] If the movable blade 81A4 is in the rotation end position shown in Fig. 8B and is unable to hold the rear end portion WE of the wire W, the movable blade 81A4 may rotate in the retraction direction indicated by arrow R as shown in Fig. 8C, and when it rotates to the standby position as shown in Fig. 8D, the rear end portion WE of the wire W may become pinched between the movable blade 81A4 and the drive member 82A. Even in such a case, the provision of the discharge guide portion 96A4 described above allows the wire W to easily slip out from between the passage forming member 95A4 of the movable blade 81A4 and the drive member 82A.

[0107] Therefore, even if the rear end WE of the wire W cannot be held by the movable blade 81A4, the wire W is prevented from becoming difficult to remove after bundling, and work efficiency is improved.

[0108] 9A to 9D are diagrams showing a fifth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0109] As shown in Figure 9A, the cutting section 8A5 of the fifth example of the first embodiment has a different configuration of the movable blade 81A5 from the cutting section 8A1 of the first example described above. Therefore, the following describes the details of the movable blade 81A5, and the other components are numbered the same as the cutting section 8A1 of the first example, and detailed descriptions of the components will be omitted.

[0110] 1, a movable blade 81A5 is a fifth embodiment of the movable blade 81A and includes an axial hole 85A into which the fixed blade 80A is inserted, and a second wire passage 86A5 through which the wire W passes. The movable blade 81A5 also includes a blade portion 87A that is provided on one side of the second wire passage 86A5 and slides along the outer peripheral surface of the fixed blade 80A, and a passage forming member 95A5 that is provided on the other side of the second wire passage 86A5, i.e., the side opposite to the blade portion 87A. The movable blade 81A5 also includes a connecting portion 88A to which the drive member 82A is connected.

[0111] The second wire passage 86A5 is formed of an opening such as a groove or hole through which the wire W passes. When the movable blade 81A5 is in the standby position shown in FIG. 9A , the second wire passage 86A5 is connected to the first wire passage 83A of the fixed blade 80A and forms a wire W feed path through which the wire W passes before being cut. When the movable blade 81A5 is in the standby position, one side of the second wire passage 86A5 is a first side with respect to the wire W feed path. The other side of the second wire passage 86A5 is always a second side with respect to the wire W feed path. When the movable blade 81A5 is in the standby position, a blade portion 87A is provided on the first side with respect to the wire W feed path. Furthermore, a path forming member 95A5 that forms the second wire passage 86A5 is provided on a second side of the movable blade 81A5 opposite the first side. Furthermore, when the movable blade 81A5 is in the rotation end position, which is the movement end position shown in FIG. 9B, the second wire passage 86A5 is not in communication with the first wire passage 83A of the fixed blade 80A.

[0112] The cutting unit 8A5 includes a suppression unit 96A5 that suppresses the wire W from being pinched between the movable blade 81A5 and the driving member 82A. The suppression unit 96A5 is configured by retracting the end of the passage forming member 95A5 that faces the guide unit 40 in a direction away from the guide unit 40 when the movable blade 81A5 is moved to the standby position shown in Figures 9A and 9D by rotation about the fixed blade 80A as a fulcrum.

[0113] When the movable blade 81A5 is in the rotation end position shown in Fig. 9B and is unable to hold the rear end WE of the wire W, the movable blade 81A5 rotates in the retraction direction indicated by arrow R as shown in Fig. 9C, and when it rotates to the standby position as shown in Fig. 9D, a space is formed by the suppression portion 96A5 between the guide portion 40 and the passage forming member 95A5 of the movable blade 81A5. This prevents the wire W from being caught between the movable blade 81A5 and the drive member 82A.

[0114] Therefore, even if the rear end WE of the wire W cannot be held by the movable blade 81A5, the wire W is prevented from becoming difficult to remove after bundling, and work efficiency is improved.

[0115] 10A to 10E are diagrams showing a sixth example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0116] As shown in FIG. 10A, the cutting section 8A6 of the sixth example of the first embodiment differs from the cutting section 8A1 of the first example described above in the configuration of the movable blade 81A6 and the driving member 82A6. Therefore, the following describes the details of the movable blade 81A6 and the driving member 82A6, and the other components are assigned the same numbers as the cutting section 8A1 of the first example, and detailed descriptions of the components are omitted.

[0117] 1, a movable blade 81A6 which is a sixth embodiment of the movable blade 81A includes an axial hole portion 85A into which the fixed blade 80A is inserted, and a second wire passage 86A6 through which the wire W passes. The movable blade 81A6 also includes a blade portion 87A which is provided on one side of the second wire passage 86A6 and slides along the outer peripheral surface of the fixed blade 80A, and a passage forming member 95A6 which is provided on the other side of the second wire passage 86A6, i.e., on the side opposite to the blade portion 87A. The movable blade 81A6 also includes a connecting portion 88A to which a driving member 82A6 is connected.

[0118] The second wire passage 86A6 is formed of an opening such as a groove or hole through which the wire W passes. When the movable blade 81A6 is in the standby position shown in FIG. 10A , the second wire passage 86A6 is connected to the first wire passage 83A of the fixed blade 80A and forms a wire W feed path through which the wire W passes before being cut. When the movable blade 81A6 is in the standby position, one side of the second wire passage 86A6 is a first side with respect to the wire W feed path. The other side of the second wire passage 86A6 is always a second side with respect to the wire W feed path. When the movable blade 81A6 is in the standby position, a blade portion 87A is provided on the first side with respect to the wire W feed path. Furthermore, a path forming member 95A6 that forms the second wire passage 86A6 is provided on a second side of the movable blade 81A6 opposite the first side. Furthermore, when the movable blade 81A6 is in the rotation end position, which is the movement end position shown in FIG. 10B, the second wire passage 86A6 is not in communication with the first wire passage 83A of the fixed blade 80A.

[0119] The movable blade 81A6 is equipped with a suppression portion 96A6 that suppresses the wire W from being pinched between the passage forming member 95A6 and the driving member 82A6. The suppression portion 96A6 is configured by providing a convex portion that protrudes toward the driving member 82A6 on the surface of the movable blade 81A6 that faces the driving member 82A6, which is connected to the movable blade 81A6 by the connecting portion 88A. The movable blade 81A6 and the driving member 82A6 rotate around the fixed blade 80A as a fulcrum, and when the movable blade 81A6 moves to the standby position shown in FIGS. 10A and 10E, the movable blade 81A6 faces the guide portion 40. The suppression portion 96A6 is provided on the end of the passage forming member 95A6 that faces the guide portion 40.

[0120] The driving member 82A6 includes a suppressing portion 97A6 that suppresses the wire W from being pinched between the driving member 82A6 and the passage forming member 95A6. The suppressing portion 97A6 is configured by providing a convex portion that protrudes toward the movable blade 81A6 on the surface of the driving member 82A6 that faces the passage forming member 95A6. The suppressing portion 97A6 is provided on the end of the driving member 82A6 that faces the guide portion 40.

[0121] In addition, the cutting portion 8A6 may be configured to have a suppression portion on at least one of the movable blade 81A6 and the driving member 82A6, as long as the distance between the passage forming member 95A6 of the movable blade 81A6 and the driving member 82A6 is less than the diameter of the wire W when the movable blade 81A6 is moved to the standby position.

[0122] When the movable blade 81A6 is at the rotation end position shown in Fig. 10B and is unable to hold the rear end portion WE of the wire W, as the movable blade 81A6 rotates in the retraction direction indicated by arrow R as shown in Fig. 10C, the rear end portion WE of the wire W comes into contact with the suppression portion 96A6 of the movable blade 81A6, preventing the rear end portion WE of the wire W from being pinched between the movable blade 81A6 and the driving member 82A6. Furthermore, as shown in Fig. 10D, the rear end portion WE of the wire W comes into contact with the suppression portion 97A6 of the driving member 82A6, preventing the rear end portion WE of the wire W from being pinched between the movable blade 81A6 and the driving member 82A6. As a result, when the movable blade 81A6 rotates to the standby position as shown in Fig. 10E, the suppression portion 96A6 of the movable blade 81A6 and the suppression portion 97A6 of the driving member 82A6 prevent the rear end portion WE of the wire W from being pinched between the movable blade 81A6 and the driving member 82A6.

[0123] Therefore, even if the rear end WE of the wire W cannot be held by the movable blade 81A6, the wire W is prevented from becoming difficult to remove after bundling, and work efficiency is improved.

[0124] 11A to 11C are diagrams showing a seventh example of the cutting section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0125] As shown in FIG. 11A, the cutting portion 8A7 of the seventh example of the first embodiment has a different configuration of the movable blade 81A7 from the cutting portion 8A1 of the first example described above. Therefore, the following describes the details of the movable blade 81A7, and the other components are assigned the same numbers as the cutting portion 8A1 of the first example, and detailed descriptions of the components are omitted.

[0126] 1, a movable blade 81A7 which is a seventh embodiment of the movable blade 81A includes an axial hole portion 85A into which the fixed blade 80A is inserted, and a second wire passage 86A7 through which the wire W passes. The movable blade 81A7 also includes a blade portion 87A which is provided on one side of the second wire passage 86A7 and slides along the outer peripheral surface of the fixed blade 80A, and a passage forming member 95A7 which is provided on the other side of the second wire passage 86A7, i.e., on the side opposite to the blade portion 87A. The movable blade 81A7 also includes a connecting portion 88A to which the drive member 82A6 is connected.

[0127] The second wire passage 86A7 is formed of an opening such as a groove or hole through which the wire W passes. When the movable blade 81A7 is in the standby position shown in FIG. 11A , the second wire passage 86A7 is connected to the first wire passage 83A of the fixed blade 80A and forms a wire W feed path through which the wire W passes before being cut. When the movable blade 81A7 is in the standby position, one side of the second wire passage 86A7 is a first side with respect to the wire W feed path. The other side of the second wire passage 86A7 is always a second side with respect to the wire W feed path. When the movable blade 81A7 is in the standby position, a blade portion 87A is provided on the first side with respect to the wire W feed path. Furthermore, a path forming member 95A7 that forms the second wire passage 86A7 is provided on a second side of the movable blade 81A7 opposite the first side. Furthermore, when the movable blade 81A7 is in the rotation end position, which is the movement end position shown in FIG. 11B, the second wire passage 86A7 is not in communication with the first wire passage 83A of the fixed blade 80A.

[0128] The movable blade 81A7 is equipped with a behavior change suppressing portion 96A7 that suppresses a change in behavior of the wire W between the movable blade 81A7 and the guide portion 40. The behavior change suppressing portion 96A7 is configured by providing a convex portion that protrudes toward the guide portion 40 at an end of the movable blade 81A7 that faces the end portion 45b of the guide portion 40 when the movable blade 81A7 moves to the rotation end position, which is the movement end position shown in Figures 11B and 11C, by rotation about the fixed blade 80A as a fulcrum.

[0129] When the movable blade 81A7 is in the rotation end position shown in Figure 11B, the behavior change suppression portion 96A7 faces the guide portion 40, so the distance between the movable blade 81A7 and the guide portion 40 is narrower than in a configuration in which the behavior change suppression portion 96A7 is not provided.

[0130] When the tip of the first engagement surface 91 described above is worn, it may not be possible to hold the rear end WE of the wire W. Even in such a case, when a pulling force is applied to the wire W by twisting the wire W wound around the reinforcing bar S with the binding part 5A, the behavior of the wire W is prevented from changing significantly, as shown by the two-dot chain line in FIG. 11C . This limits the degree of freedom of movement of the wire W between the guide part 40 and the movable blade 81A7. Therefore, when the movable blade 81A7 rotates to the standby position, it is possible to prevent the end WE of the wire W from moving to a position where it is sandwiched between the movable blade 81A7 and the drive member 82A.

[0131] Therefore, when the movable blade 81A7 rotates to the standby position, the wires W are prevented from becoming difficult to remove after bundling, and work efficiency is improved.

[0132] 12A to 12E are diagrams showing a first example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0133] As shown in FIG. 12A, the curl forming section 4A1 of the first example of the first embodiment includes a wire retraction section 98A1 that prevents the wire W from being pinched between the guide section 40A1 and the cutting section 8.

[0134] The wire retraction portion 98A1 is provided at the end of the guide portion 40A1 facing the movable blade 81. The wire retraction portion 98A1 is configured as a surface that is inclined in a direction that increases the distance between the wire retraction portion 98A1 and the movable blade 81, with respect to the wire sliding surface 44. The wire retraction portion 98A1 may be configured as a flat surface, a curved surface, or an uneven surface.

[0135] The wire evacuation section 98A1 is located upstream along the feed direction of the wire W from the position where the downstream end Pe along the feed direction of the wire W, shown by the dotted line, meets the feed path WS of the wire W before curl formation and the wire sliding surface 44.

[0136] As a result, the tip of the wire W before curling comes into contact with the wire sliding surface 44, and the wire W is guided to the wire guide 43, allowing the wire W to be curled.

[0137] 12C, if the rear end WE of the wire W cannot be held, even if the movable blade 81 rotates in the retraction direction indicated by arrow R as shown in Fig. 12D, the rear end WE of the wire W will not enter the second wire passage 86 and will come into contact with the drive member 82. However, by providing the wire retraction section 98A1, the distance between the wire sliding surface 44 and the movable blade 81 is wider than before, and therefore, even if the movable blade 81 rotates to the standby position as shown in Fig. 12E, the wire W is prevented from being pinched between the wire sliding surface 44 and the movable blade 81 and being bent.

[0138] Therefore, even if the rear end WE of the wire W cannot be held by the movable blade 81, the wire W is prevented from becoming difficult to remove after bundling, and work efficiency is improved.

[0139] 13A to 13E are diagrams showing a second example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0140] As shown in FIG. 13A, the curl forming section 4A2 of the second example of the first embodiment includes a wire retraction section 98A2 that prevents the wire W from being pinched between the guide section 40A2 and the cutting section 8.

[0141] The wire retraction portion 98A2 is provided at the end of the guide portion 40A2 facing the movable blade 81. The wire retraction portion 98A2 is configured as a surface that recedes in a direction away from the movable blade 81 at the end of the guide portion 40A2 facing the movable blade 81, which is on the upstream side along the feeding direction of the wire W.

[0142] The wire retraction section 98A2 is located upstream in the feeding direction of the wire W from the position where the wire sliding surface 44 meets the feeding path WS of the wire W before curling, indicated by the two-dot chain line.

[0143] As a result, the tip of the wire W before curling comes into contact with the wire sliding surface 44, and the wire W is guided to the wire guide 43, allowing the wire W to be curled.

[0144] 13C, if the rear end WE of the wire W cannot be held, even if the movable blade 81 rotates in the retraction direction indicated by arrow R as shown in Fig. 13D, the rear end WE of the wire W will not enter the second wire passage 86 and will come into contact with the drive member 82. However, by providing the wire retraction section 98A2, the distance between the wire sliding surface 44 and the movable blade 81 is wider than before, and therefore the wire W is prevented from being pinched between the wire sliding surface 44 and the movable blade 81 and being bent, even if the movable blade 81 rotates to the standby position as shown in Fig. 13E.

[0145] Therefore, even if the rear end WE of the wire W cannot be held by the movable blade 81, the wire W is prevented from becoming difficult to remove after bundling, and work efficiency is improved.

[0146] 14A to 14E are diagrams showing a third example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0147] As shown in FIG. 14A, the curl forming section 4A3 of the third example of the first embodiment includes a movable range suppressing section 98A3 that reduces the movable range of the wire W between the guide section 40A3 and the cutting section 8.

[0148] The movable range suppression portion 98A3 is provided at the end of the guide portion 40A3 facing the movable blade 81. The movable range suppression portion 98A3 extends from the end of the guide portion 40A3 facing the movable blade 81 toward the movable blade 81, and is configured as a surface that is inclined relative to the wire sliding surface 44 in a direction that narrows the distance between the movable blade 81 and the movable blade 81.

[0149] 14B, when the movable blade 81 rotates in the cutting direction indicated by the arrow F to cut the wire W, the wire W may move toward the guide portion 40A3 as indicated by the solid line. The guide portion 40A3 is provided with a movable range suppression portion 98A3, which narrows the gap between the movable blade 81 and the guide portion 40A3, thereby reducing the movable range of the wire W.

[0150] As a result, as shown in Figure 14C, the movable blade 81 rotates to the end of rotation position, and even if a pulling force is applied to the wire W wound around the reinforcing bar S by twisting the wire W at the binding portion 5A, the wire W is maintained in a held state in the second wire passage 86.

[0151] Then, when the movable blade 81 rotates in the retraction direction indicated by the arrow R as shown in Figure 14D, the rear end WE of the wire W is guided into the second wire passage 86, and even if the movable blade 81 rotates to the standby position as shown in Figure 14E, the wire W is prevented from being pinched between the movable blade 81 and the driving member 82.

[0152] Therefore, the wire W is prevented from becoming difficult to remove after bundling, and work efficiency is improved.

[0153] 15A to 15D are diagrams showing a fourth example of the curl forming section of the first embodiment provided in the reinforcing bar binding machine of this embodiment.

[0154] As shown in FIG. 15A, the curl forming section 4A4 of the fourth example of the first embodiment includes a movable range suppressing section 98A4 that reduces the movable range of the wire W between the guide section 40A4 and the cutting section 8.

[0155] The movable range suppression portion 98A4 is provided at the end of the guide portion 40A4 facing the movable blade 81. The movable range suppression portion 98A4 is configured by extending the end of the guide portion 40A4 facing the movable blade 81 toward the movable blade 81.

[0156] 15B, if the rear end WE of the wire W cannot be held, the wire W may move to the position shown by the two-dot chain line in a configuration without the movable range suppression part 98A4. In contrast, by extending the guide part 40A4 toward the movable blade 81 and providing the movable range suppression part 98A4, the distance between the guide part 40A4 and the movable blade 81 is narrowed, and the movable range of the wire W is reduced.

[0157] As a result, when the movable blade 81 rotates in the retraction direction indicated by the arrow R as shown in Figure 15C, the rear end WE of the wire W is pushed by the driving member 82 and guided toward the wire sliding surface 44, and even when the movable blade 81 rotates to the standby position as shown in Figure 15D, the wire W is prevented from being pinched between the driving member 82 and the guide portion 40A4.

[0158] Therefore, the wire W is prevented from becoming difficult to remove after bundling, and work efficiency is improved.

[0159] Figures 16A to 16D are diagrams showing another embodiment of the reinforcing bar binding machine of this embodiment, Figure 17 is a block diagram showing another embodiment of the reinforcing bar binding machine of this embodiment, and Figure 18 is a flowchart showing another embodiment of the reinforcing bar binding machine of this embodiment, in which the cutting unit 8 is controlled to prevent the wire W from being pinched after cutting.

[0160] In the rebar binding machine 1A, the movement of the advancing / retreating cylinder section 54, which moves with the rotation of the torsion motor 51 shown in Fig. 2, is transmitted to the drive member 82 shown in Figs. 16A to 16D, driving the movable blade 81 of the cutting section 8. In this way, the torsion motor 51 serves as the drive section for the drive member 82. The rebar binding machine 1A is equipped with a control section 100 that controls the torsion motor 51. When the switch 101 is activated by operating the trigger 10t, the control section 100 controls the feed motor 31, the solenoid 61, and the torsion motor 51 according to a pre-stored program.

[0161] When the trigger 10t is operated to activate the switch 101, the control unit 100 drives the feed motor 31 in step SA1 of Fig. 18. The control unit 100 controls the rotation amount of the feed motor 31 by a known method, and by rotating the feed motor 31 a predetermined amount, the wire W is fed by a predetermined amount, and the wire W is wound around the reinforcing bar S by the curl forming unit 4A shown in Fig. 1 etc.

[0162] After the control unit 100 has rotated the feed motor 31 by a predetermined feed amount of the wire W, the control unit 100 stops the feed motor 31 in step SA2. After stopping the feed motor 31, the control unit 100 drives the solenoid 61 in step SA3 to activate the reel brake 60 and restrict the rotation of the wire reel 20.

[0163] After driving the solenoid 61, the control unit 100 drives the torsion motor 51 in step SA4, causing the torsion motor 51 to rotate in the forward direction. The control unit 100 controls the amount of rotation of the torsion motor 51 using a known method, and first, the forward movement of the retractable cylinder 54 shown in FIG. 2 is transmitted to the driving member 82 by a driving force transmission mechanism (not shown), causing the movable blade 81 to rotate in the cutting direction indicated by the arrow F, as shown in FIG. 16A, and the wire W is cut.

[0164] Furthermore, in conjunction with the advancement of the retractable cylindrical portion 54, the twisting hook 55 operates in the closing direction, gripping a portion of the wire wound in a loop. After the movable blade 81 rotates to the rotation end position, which is the movement end position, the connection between the retractable cylindrical portion 54 and the drive member 82 is released, and the retractable cylindrical portion 54 rotates, causing the twisting hook 55 gripping the wire W to rotate, and the wire W is twisted.

[0165] After rotating the torsion motor 51 in the forward direction by the amount necessary for the twisting operation described above, the control unit 100 reverses the torsion motor 51 in step SA5. When the torsion motor 51 rotates in the reverse direction, the retractable cylinder 54 and the twisting hook 55 move rearward, and the twisting hook 55 opens and releases the wire W. The control unit 100 reverses the torsion motor 51 until the retractable cylinder 54 and the twisting hook 55 move to the standby position. While the retractable cylinder 54 and the twisting hook 55 are moving to the standby position, the retractable cylinder 54 and the drive member 82 are reconnected, and the movable blade 81 rotates in the retracting direction indicated by arrow R, as shown in FIG. 16B .

[0166] When the control unit 100 reverses the torsion motor 51 by an amount necessary for the operation of moving the retractable cylinder unit 54 and the movable blade 81 to the standby position, it stops the torsion motor 51 in step SA6.

[0167] When the tip of the first engagement surface 91 described above is worn, after the movable blade 81 rotates to the rotation end position, which is the end of movement position, when a pulling force is applied to the wire W wound around the reinforcing bar S by twisting the wire W at the binding portion 5A, it may be impossible to hold the rear end portion WE of the wire W with the movable blade 81, as shown in Figure 16A.

[0168] If the rear end WE of the wire W cannot be held by the movable blade 81, when the movable blade 81 rotates in the retreat direction indicated by the arrow R, the rear end WE of the wire W may become pinched between the driving member 82 and the movable blade 81, as shown in Figure 16B.

[0169] Taking such a case into consideration, after rotating the movable blade 81 to the standby position, the control unit 100 rotates the torsion motor 51 forward by a predetermined amount in step SA7. By rotating the torsion motor 51 forward by a predetermined amount from a state in which the movable blade 81 is in the standby position, the movable blade 81 rotates by a predetermined amount in the cutting direction indicated by arrow F, as shown in FIG. 16C . This causes the movable blade 81 and the drive member 82 to move away from the rear end WE of the wire W, thereby removing the wire W that was pinched between the drive member 82 and the movable blade 81. Then, in step SA8, the control unit 100 reverses the torsion motor 51 by a predetermined amount required to move the retractable tube 54 and the movable blade 81 to the standby position, and stops the torsion motor 51 in step SA9. This prevents the wire W from being pinched between the movable blade 81 and the drive member 82 when the movable blade 81 rotates in the retractable direction indicated by arrow R and moves to the standby position, as shown in FIG. 16D .

[0170] Therefore, the wire W is prevented from becoming difficult to remove after bundling, improving work efficiency. Also, even if the cutting section and guide section have conventional configurations, the wire W can be prevented from being pinched by simply controlling the movable blade. [Explanation of symbols]

[0171] 1A Rebar tying machine, 10 Main body, 10a Handle, 11 Guide frame, 2A Reel accommodating section, 20 Wire reel, 3A Wire feeding section, 4A Curl forming section, 40 Guide section, 41 Wire guide, 42 Wire guide (first contact section), 43 Wire guide Guide (second contact portion), 44... wire sliding surface, 45a, 45b... end portion, 5A... binding portion, 51... torsion motor, 52... gear, 53... screw shaft portion, 54... advance / retreat cylindrical portion, 55... torsion hook, 6A... braking portion, 7... guideway, 7b... end portion, 8A1 to 8A7... cutting portion, 80, 80A... Fixed blades 81, 81A, 81A1 to 81A7 Movable blades 82A, 82A6 Drive member 83A First wire passage 84A Blade portion 85A Shaft hole portion 86A1 to 86A7 Second wire passage 87A Blade portion 88A Connecting portion 89A Link 93A1, 93A2, 93A3 Guidance section, 95A1, 95A2, 95A3, 95A4, 95A5, 95A6, 95A7 Passageway forming member, 96A4 Discharge guidance section, 96A5, 96A6, 97A6 Suppression section, 96A7 Behavior change suppression section, 98A1, 98A2 Wire retraction section, 98A3, 98A4 Moving range suppression section, W Wire

Claims

[Claim 1] a wire feeding unit that feeds the wire; a cutting unit provided downstream of the wire feeding unit along the feeding direction of the wire fed by the wire feeding unit, the cutting unit having a fixed blade in which a first wire passage through which the wire passes is formed, and a movable blade in which a second wire passage through which the wire passes is formed and which slides on an outer peripheral surface of the fixed blade to cut the wire; a first contact portion provided between the wire feeding portion and the cutting portion and on a first side of a wire feeding path, the first contact portion being capable of contacting the wire from the first side; a guide section that is provided downstream of the cutting section and on a second side of the wire feed path opposite to the first side, the guide section including a second contact section that can contact the wire from the second side, and that restricts the direction of travel of the wire and curls the wire by the second contact section contacting the wire in a state where the second contact section is in contact with the first contact section; the movable blade is movable between a standby position in which the first wire passage and the second wire passage are connected to each other and a movement end position in which the first wire passage and the second wire passage are not connected to each other, The second wire passage has an opening facing the guide section that is wider toward the second side in the moving direction of the movable blade than an opening facing the fixed blade, and has a recess on the downstream side of the widened portion, and is provided with a guide section that guides the wire after cutting when the movable blade moves from the movement end position to the standby position, The guide portion has an end portion that protrudes toward the guide portion when the movable blade is moved to the standby position, and the distance between the end portion on the upstream side of the guide portion and the end portion is less than the diameter of the wire. Binding machine.

Images