Steel bar binding machine

Abstract

The invention provides a reinforcing steel bar binding machine. A rebar binding machine (1A) is provided with: a binding wire feeding unit (3A) for feeding a binding wire (W); a curl forming unit (5A) that constitutes a binding wire feeding path for winding the binding wire fed in the forward direction by the binding wire feeding unit around the reinforcing steel bar (S); and a binding unit (7A) that twists the binding wire that is fed in the reverse direction by the binding wire feeding unit and that is wound around the reinforcing steel bar. The curl forming unit includes a curl guide (50) having a guide member (53) for imparting a curl to the binding wire, and an induction guide (51) for inducing the binding wire imparted the curl by the curl guide to the binding unit, and the action of feeding the binding wire in the opposite direction by the binding wire feeding unit is linked with the action of retracting the guide member. The strapping wire along the induction guide is pulled closer to the direction of the reinforcing steel bar than the strapping wire along the curl guide.

Description

[0001] This application is a divisional application of the application with the application date of July 29, 2021, application number 202110865557.1, and invention title of "Steel Bar Bundling Machine". Technical Field

[0002] The present invention relates to a bundling machine for bundling bundling objects such as steel bars with bundling wires. Background Art

[0003] In concrete buildings, steel bars are used to improve strength, and are bundled with bundling wires during concrete pouring so that the steel bars do not shift from the predetermined positions.

[0004] Conventionally, a bundling machine called a steel bar bundling machine has been proposed, which winds a bundling wire around two or more steel bars, twists the bundling wires wound around the steel bars, and bundles the two or more steel bars with the bundling wire. The bundling machine includes: a bundling wire feeding mechanism that sends out the bundling wire wound around a reel and winds it around the steel bar; a holding mechanism that grabs the bundling wire wound around the steel bar; and a bundling wire twisting mechanism that rotationally drives the holding mechanism to twist the bundling wire. By operating a trigger, the bundling wire feeding mechanism, the holding mechanism, and the bundling wire twisting mechanism are sequentially actuated, thereby performing a cycle of bundling operations.

[0005] When bundling steel bars with a bundling wire, if the bundling is loose, the steel bars will be misaligned with each other, so it is required to firmly hold the steel bars with each other. Therefore, a technique of feeding the bundling wire wound around the periphery of the steel bar in the opposite direction to wind it around the steel bar has been proposed (for example, refer to Patent Document 1).

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Patent Laid-Open No. 2004-142813

[0009] In a conventional bundling machine, in a state where the bundling wire is wound around the steel bar along the head and the lower guide arm, after the bundling wire is clamped by a clamping device, the bundling wire is fed in the opposite direction.

[0010] In this case, among the bundling wires wound around the periphery of the steel bar, the bundling wire starting from the part along the head moves in a direction approaching the steel bar. When the bundling wire at the part along the head moves to a position in contact with the steel bar, due to the friction between the bundling wire and the steel bar, the load for feeding the bundling wire in the opposite direction becomes large. Therefore, the bundling wire at the part along the lower guide arm cannot be sufficiently pulled back, and there is a possibility that the bundling wire cannot be wound around the steel bar. Summary of the Invention

[0011] The present invention has been completed to solve such a problem, and an object thereof is to provide a bundling machine that winds a bundling wire around a bundled object.

[0012] To solve the above problems, the present invention provides a bundling machine, comprising: a bundling wire feeding unit that feeds a bundling wire; a curling guide that imparts a curling mark to the bundling wire fed in the positive direction by the bundling wire feeding unit; and a bundling unit that twists the bundling wire fed in the reverse direction by the bundling wire feeding unit and wound around the bundled object. The bundling unit includes a bundling wire locking body that locks the front end side of the bundling wire that is fed in the positive direction by the bundling wire feeding unit, imparted with a curling mark by the curling guide, and wound around the periphery of the bundled object. The bundling machine is provided with a pulling unit that pulls the second side bundling wire, which is wound around the periphery of the bundled object and has its front end locked, and is located on the side opposite to the curling guide with respect to the bundled object, closer to the bundled object in the direction of the bundled object before the first side bundling wire located on the curling guide side.

[0013] In the present invention, the second side bundling wire, which is wound around the periphery of the bundled object and has its front end locked, and is located on the side opposite to the curling guide with respect to the bundled object, is first pulled closer to the bundled object in the direction of the bundled object, and then the first side bundling wire located on the curling guide side is pulled closer to the bundled object in the direction of the bundled object.

[0014] Advantages of the Invention

[0015] Among the first side bundling wires that are wound around the periphery of the bundled object and have their front ends locked, the influence of the friction generated by the contact between the bundling wire and the bundled object due to the action of feeding the bundling wire in the reverse direction is small. Thus, by first pulling the second side bundling wire, which is located on the side opposite to the curling guide with respect to the bundled object, closer to the bundled object in the direction of the bundled object, and then pulling the first side bundling wire located on the curling guide side closer to the bundled object in the direction of the bundled object, the bundling wire can be reliably wound around the bundled object. Description of the Drawings

[0016] Figure 1 It is a structure diagram observed from the side showing an example of the overall structure of a steel bar bundling machine.

[0017] Figure 2A It is a perspective view showing an example of the bundling unit.

[0018] Figure 2B It is a cross-sectional top view showing an example of the bundling unit.

[0019] Figure 2C It is a cross-sectional top view showing an example of the bundling unit.

[0020] Figure 3A It is a side view showing an example of the guide member retracting mechanism of the first embodiment.

[0021] Figure 3B It is a bottom view cross-sectional view showing an operation example of the guide member retraction mechanism of the first embodiment.

[0022] Figure 3C It is a bottom view cross-sectional view showing an operation example of the guide member retraction mechanism of the first embodiment.

[0023] Figure 3D It is a front view cross-sectional view showing an operation example of the guide member retraction mechanism of the first embodiment.

[0024] Figure 3E It is a front view cross-sectional view showing an operation example of the guide member retraction mechanism of the first embodiment.

[0025] Figure 4 It is a block diagram showing an example of the control function of the steel bar tying machine.

[0026] Figure 5A It is an operation explanatory diagram showing an example of the operation of tying steel bars with a steel bar tying machine.

[0027] Figure 5B It is an operation explanatory diagram showing an example of the operation of tying steel bars with a steel bar tying machine.

[0028] Figure 5C It is an operation explanatory diagram showing an example of the operation of tying steel bars with a steel bar tying machine.

[0029] Figure 5D It is an operation explanatory diagram showing an example of the operation of tying steel bars with a steel bar tying machine.

[0030] Figure 5E It is an operation explanatory diagram showing an example of the operation of tying steel bars with a steel bar tying machine.

[0031] Figure 5F It is an operation explanatory diagram showing an example of the operation of tying steel bars with a steel bar tying machine.

[0032] Figure 6A It is a side view showing an example of the guide member retraction mechanism of the second embodiment.

[0033] Figure 6B It is a bottom view cross-sectional view showing an operation example of the guide member retraction mechanism of the second embodiment.

[0034] Figure 6C It is a bottom view cross-sectional view showing an operation example of the guide member retraction mechanism of the second embodiment.

[0035] Figure 6D It is a front view cross-sectional view showing an operation example of the guide member retraction mechanism of the second embodiment.

[0036] Figure 6EIt is a front elevation sectional view showing an operation example of the guide member retraction mechanism of the second embodiment.

[0037] Figure 7A It is a side view showing an example of the guide member retraction mechanism of the third embodiment.

[0038] Figure 7B It is a bottom elevation sectional view showing an operation example of the guide member retraction mechanism of the third embodiment.

[0039] Figure 7C It is a front elevation sectional view showing an operation example of the guide member retraction mechanism of the third embodiment.

[0040] Figure 7D It is a front elevation sectional view showing an operation example of the guide member retraction mechanism of the third embodiment.

[0041] Figure 7E It is a front elevation sectional view showing an operation example of the guide member retraction mechanism of the third embodiment.

[0042] Figure 7F It is a front elevation sectional view showing an operation example of the guide member retraction mechanism of the third embodiment.

[0043] Figure 8A It is a side view showing an example of the guide member of other modification examples.

[0044] Figure 8B It is a front elevation sectional view showing an operation example of the guide member of other modification examples.

[0045] Figure 9 It is a side view of the main part showing a modification example of the bundling machine.

[0046] Figure 10 It is a side view of the main part showing another modification example of the bundling machine. Detailed Embodiment

[0047] Hereinafter, with reference to the drawings, an example of a steel bar bundling machine as an embodiment of the bundling machine of the present invention will be described.

[0048] <Structural Example of Steel Bar Bundling Machine>

[0049] Figure 1 It is a structural view observed from the side showing an example of the overall structure of the steel bar bundling machine. The steel bar bundling machine 1A is in a form held by an operator and includes a main body portion 10A and a handle portion 11A.

[0050] In addition, the reinforcing bar tying machine 1A feeds the tying wire W in the positive direction indicated by the arrow F, winds it around the reinforcing bars S as the bundled object, feeds the tying wire W wound around the reinforcing bars S in the reverse direction indicated by the arrow R, winds it around the reinforcing bars S, and then twists the tying wire W to tie the reinforcing bars S with the tying wire W.

[0051] In order to realize the above functions, the reinforcing bar tying machine 1A includes a magazine 2A for storing the tying wire W and a tying wire feeding unit 3A for feeding the tying wire W. In addition, the reinforcing bar tying machine 1A includes a curl forming unit 5A for forming a path for winding the tying wire W fed by the tying wire feeding unit 3A around the reinforcing bar S, and a cutting unit 6A for cutting the tying wire W wound around the reinforcing bar S. The reinforcing bar tying machine 1A further includes a tying unit 7A for twisting the tying wire W wound around the reinforcing bar S, and a driving unit 8A for driving the tying unit 7A.

[0052] In the magazine 2A, a reel 20 is stored in a rotatable and detachable manner, and a long tying wire W is wound around the reel 20 in an unwindable manner. The tying wire W uses a tying wire made of a plastically deformable metal wire, a tying wire made of a metal wire coated with a resin, or a tying wire as a twisted wire. The reel 20 winds one or more tying wires W around a hub (not shown), and one tying wire W is pulled out from the reel 20 or a plurality of tying wires W are pulled out simultaneously.

[0053] The tying wire feeding unit 3A includes a pair of feeding gears 30 for feeding one or a plurality of tying wires W arranged in parallel. The tying wire feeding unit 3A receives the rotation of a feeding motor (not shown) to rotate the feeding gears 30. Thus, the tying wire feeding unit 3A feeds the tying wire W held between the pair of feeding gears 30 along the extending direction of the tying wire W. In the configuration of feeding a plurality of tying wires W, for example, two tying wires W, the two tying wires W are fed in a parallel state.

[0054] The tying wire feeding unit 3A switches the rotation direction of the feeding gear 30 by switching the rotation direction of a feeding motor (not shown) between forward and reverse, thereby switching the feeding direction of the tying wire W between forward and reverse.

[0055] The curl forming section 5A includes: a curl guide 50, which is an example of a first guide section that gives a curl mark to the tying wire W fed by the tying wire feeding section 30; and an induction guide 51, which is an example of a second guide section that guides the tying wire W given a curl mark by the curl guide 50 to the tying section 7A. In the reinforcing bar tying machine 1A, the path of the tying wire W fed by the tying wire feeding section 3A is restricted by the curl forming section 5A, whereby the trajectory of the tying wire W becomes as follows: Figure 1 In the ring Ru shown by the dotted line, the tying wire W is wound around the steel bar S.

[0056] The curling formation part 5A includes guide members 53 and 53b which guide the binding wire W fed in the positive direction and impart a crease to the binding wire W. The guide member 53 constitutes a pulling unit that pulls the binding wire W from a predetermined side in cooperation with the binding wire feeding part 3A. The guide member 53 is provided on the introduction part side of the binding wire W fed by the binding wire feeding part 3A in the curling guide 50 and is arranged on the inner side in the radial direction of the loop Ru formed by the binding wire W. The guide member 53 restricts the binding wire W so that the binding wire W does not enter the inner side in the radial direction of the loop Ru.

[0057] The guide member 53b is provided on the discharge part side of the binding wire W fed by the binding wire feeding part 3A in the curling guide 50 and is arranged on the outer side in the radial direction of the loop Ru formed by the binding wire W.

[0058] The curling formation part 5A includes a guide member moving mechanism 54A that retracts the guide member 53. The guide member moving mechanism 54A constitutes a pulling unit that pulls the binding wire W from a predetermined side in cooperation with the binding wire feeding part 3A, and after the binding wire W is wound around the steel bar S, retracts the guide member 53 in linkage with the operation of the binding part 7A.

[0059] The cutting part 6A includes a fixed blade part 60, a movable blade part 61 that cuts the binding wire W in cooperation with the fixed blade part 60, and a transmission mechanism 62 that transmits the operation of the binding part 7A to the movable blade part 61. The cutting part 6A cuts the binding wire W by the rotational movement of the movable blade part 61 with the fixed blade part 60 as the pivot axis. The transmission mechanism 62 transmits the operation of the binding part 7A to the movable blade part 61 via the moving member 83 and rotates the movable blade part 61 in linkage with the operation of the binding part 7A to cut the binding wire W.

[0060] The binding part 7A includes a binding wire locking body 70 that locks the binding wire W. A detailed implementation manner of the binding part 7A will be described later. The driving part 8A includes a motor 80 and a speed reducer 81 that reduces speed and amplifies torque.

[0061] The steel bar bundling machine 1A has a feed restricting part 90 that abuts against the front end of the binding wire W on the feed path of the binding wire W locked by the binding wire locking body 70. In addition, in the steel bar bundling machine 1A, the curling guide 50 and the guiding guide 51 of the curling formation part 5A are provided at the front end of the main body part 10A. Moreover, the abutting part 91 that abuts against the steel bar S is provided between the curling guide 50 and the guiding guide 51 at the front end of the main body part 10A.

[0062] In addition, the handle portion 11A of the steel bar tying machine 1A extends downward from the main body portion 10A. Moreover, a battery 15A is detachably attached to the lower portion of the handle portion 11A. In addition, the magazine 2A of the steel bar tying machine 1A is provided in front of the handle portion 11A. The steel bar tying machine 1A houses the above-mentioned tying wire feeding portion 3A, cutting portion 6A, tying portion 7A, driving portion 8A for driving the tying portion 7A, etc. in the main body portion 10A.

[0063] The steel bar tying machine 1A is provided with a trigger 12A on the front side of the handle portion 11A and a switch 13A inside the handle portion 11A. In addition, a substrate 100 on which a circuit constituting a control portion is mounted is provided in the main body portion 10A.

[0064] Figure 2A It is a perspective view showing an example of the tying portion, Figure 2B 、 Figure 2C is a cross-sectional top view showing an example of the tying portion. Next, the structure of the tying portion will be described with reference to each figure.

[0065] The tying portion 7A includes a tying wire locking body 70 for locking the tying wire W and a rotating shaft 72 for operating the tying wire locking body 70. The rotating shaft 72 of the tying portion 7A is connected to the motor 80 of the driving portion 8A via a speed reducer 81, and the rotating shaft 72 is driven by the motor 80 via the speed reducer 81.

[0066] The tying wire locking body 70 includes: a center hook 70C connected to the rotating shaft 72; a first side hook 70R and a second side hook 70L that open and close with respect to the center hook 70C; and a sleeve 71 that operates the first side hook 70R and the second side hook 70L and forms the tying wire W into a desired shape.

[0067] In the tying portion 7A, the side where the center hook 70C, the first side hook 70R, and the second side hook 70L are provided is the front side, and the side where the rotating shaft 72 is connected to the speed reducer 81 is the rear side.

[0068] The center hook 70C is connected to the front end, which is one end of the rotating shaft 72, via a structure that can rotate relative to the rotating shaft 72 and can move axially integrally with the rotating shaft 72.

[0069] One end, i.e., the front end side, of the first side hook 70R along the axial direction of the rotating shaft 72 is located on one side portion with respect to the center hook 70C. In addition, the other end, i.e., the rear end side, of the first side hook 70R along the axial direction of the rotating shaft 72 is rotatably supported by the center hook 70C by a shaft 71b.

[0070] The front end of the second side hook 70L along the axial direction of the rotation shaft 72 is located on the other side of the center hook 70C. The rear end of the second side hook 70L along the axial direction of the rotation shaft 72 is rotatably supported by the center hook 70C via the shaft 71b.

[0071] Thus, in the binding wire fixing body 70, the front end side of the first side hook 70R opens and closes in a direction approaching and leaving the center hook 70C by rotating the shaft 71b as a fulcrum. In addition, the front end side of the second side hook 70L opens and closes in a direction approaching and leaving the center hook 70C.

[0072] The rotating shaft 72 is connected to the reducer 81 at the other end, i.e., the rear end, via a connecting portion 72b having a structure that can rotate integrally with the reducer 81 and can move in the axial direction relative to the reducer 81. The connecting portion 72b includes a spring 72c that urges the rotating shaft 72 in a direction approaching the reducer 81, i.e., in the rear direction. Thus, the rotating shaft 72 is configured to be able to move forward, i.e., in a direction away from the reducer 81, while receiving a force pulled backward by the spring 72c.

[0073] The sleeve 71 is supported rotatably and slidably in the axial direction by a support frame 76. The support frame 76 is an annular member, and is attached to the main body 10A in a manner that is non-rotatable in the circumferential direction and non-movable in the axial direction.

[0074] The sleeve 71 has a convex portion (not shown) protruding toward the inner peripheral surface of the space into which the rotating shaft 72 is inserted, and the convex portion enters into a groove portion of a feed screw 72a formed along the axial direction on the outer periphery of the rotating shaft 72. When the rotating shaft 72 rotates, the sleeve 71 moves in the direction along the axial direction of the rotating shaft 72, that is, in the front-rear direction, according to the rotation direction of the rotating shaft 72, by the action of the convex portion (not shown) and the feed screw 72a of the rotating shaft 72. In addition, the sleeve 71 rotates integrally with the rotating shaft 72.

[0075] The sleeve 71 includes an opening and closing pin 71 a that opens and closes the first side hook 70R and the second side hook 70L.

[0076] The opening and closing pin 71a is inserted into the opening and closing guide hole 73 provided in the first side hook 70R and the second side hook 70L. The opening and closing guide hole 73 has a shape extending along the moving direction of the sleeve 71 and converting the linear motion of the opening and closing pin 71a moving in conjunction with the sleeve 71 into an opening and closing motion based on the rotation of the first side hook 70R and the second side hook 70L with the shaft 71b as a fulcrum.

[0077] The wire fixing body 70 moves backward in the direction of arrow A2 through the sleeve 71. Thus, according to the trajectory of the opening and closing pin 71a and the shape of the opening and closing guide hole 73, the first side hook 70R and the second side hook 70L move away from the center hook 70C by a rotational movement with the shaft 71b as the fulcrum.

[0078] As a result, the first side hook 70R and the second side hook 70L open relative to the center hook 70C, and a feeding path for the binding wire W is formed between the first side hook 70R and the center hook 70C and between the second side hook 70L and the center hook 70C.

[0079] In a state where the first side hook 70R and the second side hook 70L are open relative to the center hook 70C, the binding wire W fed by the binding wire feeding unit 3A passes between the center hook 70C and the first side hook 70R. The binding wire W passing between the center hook 70C and the first side hook 70R is guided to the curl forming unit 5A. And the binding wire W that is given a crease by the curl forming unit 5A and is guided to the binding unit 7A passes between the center hook 70C and the second side hook 70L.

[0080] The wire fixing body 70 moves forward in the direction of arrow A1 through the sleeve 71. Thus, according to the trajectory of the opening and closing pin 71a and the shape of the opening and closing guide hole 73, the first side hook 70R and the second side hook 70L move closer to the center hook 70C by a rotational movement with the shaft 71b as the fulcrum. As a result, the first side hook 70R and the second side hook 70L close relative to the center hook 70C.

[0081] When the first side hook 70R closes relative to the center hook 70C, the binding wire W sandwiched between the first side hook 70R and the center hook 70C is fixed in a form that can move between the first side hook 70R and the center hook 70C. In addition, when the second side hook 70L closes relative to the center hook 70C, the binding wire W sandwiched between the second side hook 70L and the center hook 70C is fixed in a form that will not escape from between the second side hook 70L and the center hook 70C.

[0082] The sleeve 71 includes: a bending portion 71c1 that forms the binding wire W into a predetermined shape by bending the front end side, which is one end of the binding wire W, in a predetermined direction; and a bending portion 71c2 that forms the binding wire W into a predetermined shape by bending the terminal side, which is the other end of the binding wire W cut by the cutting portion 6A, in a predetermined direction.

[0083] The sleeve 71 moves in the forward direction shown by the arrow A1, so that the front end side of the binding wire W caught by the center hook 70C and the second side hook 70L is pressed by the bending portion 71c1, causing the front end side of the binding wire W to bend toward the reinforcing bar S side. In addition, the sleeve 71 moves in the forward direction shown by the arrow A1, so that the terminal side of the binding wire W caught by the center hook 70C and the first side hook 70R and cut by the cutting portion 6A is pressed by the bending portion 71c2, causing the terminal side of the binding wire W to bend toward the reinforcing bar S side.

[0084] The bundling portion 7A is provided with a rotation restricting portion 74 that restricts the rotation of the binding wire catching body 70 and the sleeve 71 linked to the rotation action of the rotation shaft 72. The rotation restricting portion 74 is provided with a rotation restricting blade 74a on the sleeve 71 and a rotation restricting claw 74b on the main body portion 10A.

[0085] The rotation restricting blade 74a is configured to have a plurality of convex portions protruding radially from the outer periphery of the sleeve 71 at a predetermined interval in the circumferential direction of the sleeve 71. The rotation restricting blade 74a is fixed to the sleeve 71 and moves and rotates integrally with the sleeve 71.

[0086] The rotation restricting claw 74b has a first claw portion 74b1 and a second claw portion 74b2 as a pair of claw portions opposed to each other at an interval through which the rotation restricting blade 74a can pass. The first claw portion 74b1 and the second claw portion 74b2 are configured to be pushed by the rotation restricting blade 74a according to the rotation direction of the rotation restricting blade 74a and can retreat from the trajectory of the rotation restricting blade 74a.

[0087] When the rotation restricting blade 74a is engaged with the rotation restricting claw 74b, the rotation restricting portion 74 restricts the rotation of the sleeve 71 linked to the rotation of the rotation shaft 72, and the sleeve 71 moves in the front-rear direction by the rotation action of the rotation shaft 72. In addition, when the engagement between the rotation restricting blade 74a and the rotation restricting claw 74b is released, the sleeve 71 rotates in linkage with the rotation of the rotation shaft 72.

[0088] Figure 3A It is a side view showing an example of the guide member moving mechanism of the first embodiment, Figure 3B 、 Figure 3C It is a bottom view cross-sectional view showing an example of the operation of the guide member moving mechanism of the first embodiment, Figure 3D 、 Figure 3E It is a front view cross-sectional view showing an example of the operation of the guide member moving mechanism of the first embodiment. Next, an example of the guide member moving mechanism of the first embodiment will be described with reference to each figure. In addition, Figure 3B 、 Figure 3C shows Figure 3A the A-A cross section of Figure 3D 、 Figure 3E shows Figure 3ABB cross section.

[0089] The guide member moving mechanism 54A of the first embodiment includes a guide member support portion 55A to which the guide member 53 is mounted, and a guide member operating portion 56A to operate the guide member support portion 55A.

[0090] The guide member support portion 55A is Figure 2B , Figure 2C The guide member 53 is provided at one end in the form of extending in the axial direction of the rotating shaft 72 shown in the figure. The guide member 53 is a cylindrical pin in this example, and protrudes laterally from the guide member support portion 55A. In addition, the portion between one end side and the other end side of the guide member support portion 55A is supported by the shaft 55G in a rotatable manner. The extending direction of the shaft 55G, that is, the axial direction, is the up-down direction orthogonal to the extending direction of the guide member 53. Moreover, the guide member support portion 55A is provided with an action portion 55H on the other end side, and the action portion 55H is pushed by the guide member action portion 56A to limit and release the rotation movement with the shaft 55G as the fulcrum.

[0091] The guide member 53 protrudes toward the feeding path of the tying wire W in the curling guide 50 by the rotation of the guide member support portion 55A about the shaft 55G as a fulcrum, and moves between a guiding position for imparting a curl mark to the tying wire W and a retreat position for retreating laterally from the feeding path of the tying wire W in the curling guide 50.

[0092] The guide member action part 56A is supported by the guide protrusion 56F in a manner that extends in the axial direction of the rotating shaft 72 between one end side and the other end side in a manner that can move along the axial direction of the rotating shaft 72, that is, the moving direction of the sleeve 71. The guide member action part 56A moves in the axial direction of the rotating shaft 72, that is, the front-back direction, in conjunction with the sleeve 71 that moves due to the rotation of the rotating shaft 72. In addition, the guide member action part 56A has an action part 56H that pushes the acted part 55H of the guide member support part 55A on one end side. Moreover, the guide member action part 56A has an engagement part 56G that engages with the sleeve 71 on the other end side.

[0093] The guide member moving mechanism 54A includes a spring 57A that urges the guide member support portion 55A in a direction in which the guide member 53 moves toward the retracted position.

[0094] like Figure 3B As shown, when the guide member action part 56A moves to a position where the action part 56H of the guide member action part 56A pushes the actioned part 55H of the guide member support part 55A, the guide member moving mechanism 54A restricts the rotation of the guide member support part 55A about the shaft 55G as a fulcrum. Figure 3B ,Figure 3D As shown, the guide member 53 moves to the guiding position.

[0095] In contrast, Figure 3C As shown in FIG. 1 , when the guide member actuating portion 56A moves to a position where the acting portion 56H of the guide member actuating portion 56A is away from the acted portion 55H of the guide member supporting portion 55A, the guide member moving mechanism 54A releases the restriction on the rotation of the guide member supporting portion 55A about the shaft 55G as a fulcrum. Figure 3C , Figure 3E As shown, the guide member support portion 55A is biased by the spring 57A to rotate, and the guide member 53 moves from the guide position to the retracted position.

[0096] Next, the linkage of the operation of the sleeve 71 , the operation of the first side hook 70R and the second side hook 70L, the guide member 53 , and the movable blade portion 61 will be described.

[0097] In the operation range in which the sleeve 71 moves in the front-rear direction without rotating along the axial direction of the rotating shaft 72, the first side hook 70R and the second side hook 70L open and close in conjunction with the movement of the sleeve 71. In addition, the guide member 53 moves between the guide position and the retreat position of the tying wire W. Furthermore, the movable blade portion 61 moves between the retreat position and the cutting position.

[0098] In the operation region in which the sleeve 71 moves in the front-rear direction without rotating in the axial direction of the rotating shaft 82, the operation region in which the first side hook 70R and the second side hook 70L are opened and closed is referred to as the first operation region. In addition, the operation region in which the guide member 53 moves between the guide position and the retreat position of the tying wire W is referred to as the second operation region. Furthermore, the operation region in which the movable blade portion 61 moves between the retreat position and the cutting position is referred to as the third operation region.

[0099] When the sleeve 71 moves from the starting position of the first action area to the end position of the first action area, as shown in FIG. Figure 2C As shown, the first side hook 70R is closed relative to the central hook 70C, and the second side hook 70L is closed relative to the central hook 70C.

[0100] During the movement of the sleeve 71 in the first action area, as shown in FIG. Figure 3B As shown in FIG. 1 , the guide member action portion 56A moves to a position where the action portion 56H of the guide member action portion 56A pushes the action portion 55H of the guide member support portion 55A. As a result, the guide member support portion 55A is restricted from rotating about the shaft 55G as a fulcrum, as shown in FIG. Figure 3B , Figure 3D As shown in FIG. 1 , the guide member 53 is in a state moved to the guide position.

[0101] In addition, when the sleeve 71 moves from the starting position of the second action area, which is the end position of the first action area, to the end position of the second action area, as shown in FIG. Figure 3C As shown in FIG. 1 , the guide member action part 56A moves to a position where the action part 56H of the guide member action part 56A is separated from the actioned part 55H of the guide member support part 55A, and the restriction on the rotation of the guide member support part 55A about the shaft 55G as a fulcrum is released. Figure 3C , Figure 3E As shown, the guide member support portion 55A is biased by the spring 57A to rotate, and the guide member 53 moves from the guide position to the retracted position.

[0102] Therefore, when the sleeve 71 moves to the end position of the first operation range, the tying wire W is locked by the tying wire locking body 70. In addition, when the sleeve 71 moves to the end position of the second operation range, the guide member 53 moves from the guide position of the tying wire W to the retreat position. Furthermore, when the sleeve 71 moves to the end position of the third operation range, the movable blade portion 61 moves from the retreat position to the cutting position.

[0103] When the sleeve 71 moves to the end position of the third action range, the locking of the rotation limiting blade 74a and the rotation limiting claw 74b is released. When the locking of the rotation limiting blade 74a and the rotation limiting claw 74b is released, the sleeve 71 rotates in conjunction with the rotation of the rotating shaft 72. The tying wire locking body 70 rotates in conjunction with the rotation of the sleeve 71, and the center hook 70C, the first side hook 70R, and the second side hook 70L that lock the tying wire W rotate.

[0104] Figure 4 1A is a block diagram showing an example of the control function of the reinforcing steel bar tying machine. Figure 1 The control unit 14A controls the motor 80 and the feed motor 31 that drives the feed gear 30 by operating the trigger 12A shown in the figure. The control unit 14A controls the position of the sleeve 71 by controlling the rotation amount of the motor 80. In addition, the control unit 14A controls the forward and reverse rotation of the feed motor 31.

[0105] The control unit 14A controls the rotation amount of the motor 80, thereby moving the sleeve 71 to the end position of the first operation range, and the binding wire W is locked by the binding wire locking body 70. In addition, the control unit 14A moves the guide member 53 from the guide position to the retreat position by moving the sleeve 71 to the end position of the second operation range. Furthermore, the control unit 14A cuts the binding wire W by moving the sleeve 71 to the end position of the third operation range.

[0106] Further, after the binding wire W is clamped by the binding wire clamping body 70, the control unit 14A links the operation of feeding the binding wire W in the reverse direction by reversing the feeding motor 31 with the operation of moving the guide member 53 from the guiding position of the binding wire W to the retracted position, thereby winding the binding wire W around the reinforcing bar S.

[0107] <Operation example of the reinforcing bar bundling machine>

[0108] Figures 5A - 5F FIG. is an operation explanatory diagram showing an example of the operation of bundling a reinforcing bar with a reinforcing bar bundling machine. Next, with reference to the respective drawings, the operation of bundling the reinforcing bar S with the binding wire W by the reinforcing bar bundling machine 1A will be described.

[0109] In the reinforcing bar bundling machine 1A, a standby state is established in which the binding wire W is clamped between a pair of feeding gears 30 and the front end of the binding wire W is located between the clamping position of the feeding gears 30 and the fixed blade portion 60 of the cutting portion 6A. Further, in the standby state of the reinforcing bar bundling machine 1A, as Figure 2A 、 Figure 2B shown, the first side hook 70R is open with respect to the center hook 70C, and the second side hook 70L is open with respect to the center hook 70C.

[0110] The reinforcing bar S is placed between the curling guide 50 and the guiding guide 51 of the curling forming portion 5A. When the trigger 12A is operated, the control unit 14A drives the feeding motor 31 in the forward rotation direction, and feeds the binding wire W in the forward direction shown by the arrow F by the binding wire feeding portion 3A.

[0111] In the case of a structure in which multiple, for example, two binding wires W are fed, the two binding wires W are fed in a state of being juxtaposed along the axial direction of the loop Ru formed by the binding wire W through a binding wire guide (not shown).

[0112] The binding wire W fed in the forward direction passes between the center hook 70C and the first side hook 70R, and is fed to the curling guide 50 of the curling forming portion 5A. The binding wire W passes through the curling guide 50, and thus a curling mark for winding around the reinforcing bar S is imparted thereto.

[0113] As Figure 5A shown, the binding wire W imparted with the curling mark by the curling guide 50 is guided by the guiding guide 51, and is further fed in the forward direction by the binding wire feeding portion 3A, and thus is guided by the guiding guide 51 between the center hook 70C and the second side hook 70L. Then, as Figure 5B shown, the binding wire W is fed until the front end thereof abuts against the feed restricting portion 90. When the front end of the binding wire W is fed to the position where it abuts against the feed restricting portion 90, the control unit 14A stops driving the feeding motor 31.

[0114] After stopping the feeding of the tying wire W in the forward direction, the control unit 14A drives the motor 80 in the forward rotation direction. In the first operation region where the tying wire W is clamped by the tying wire clamping body 70, the sleeve 71 is clamped by the rotation restricting blade 74a to the rotation restricting claw 74b, thereby restricting the rotation of the sleeve 71 linked to the rotation of the rotation shaft 72. Thus, the rotation of the motor 80 is converted into a linear movement, and the sleeve 71 moves in the direction of arrow A1 as the forward direction.

[0115] When the sleeve 71 moves in the forward direction, the opening and closing pin 71a passes through the opening and closing guide hole 73. Thus, as Figure 2C shown, the first side hook 70R moves in the direction approaching the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. When the first side hook 70R closes relative to the center hook 70C, the tying wire W sandwiched between the first side hook 70R and the center hook 70C is clamped in a form that can move between the first side hook 70R and the center hook 70C.

[0116] In addition, the second side hook 70L moves in the direction approaching the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. When the second side hook 70L closes relative to the center hook 70C, the tying wire W sandwiched between the second side hook 70L and the center hook 70C is clamped in a form that will not come out from between the second side hook 70L and the center hook 70C.

[0117] After advancing the sleeve 71 to the end position of the first operation region where the tying wire W is clamped by the closing actions of the first side hook 70R and the second side hook 70L, the control unit 14A temporarily stops the rotation of the motor 80 and drives the feeding motor 31 in the reverse direction. As a result, the pair of feeding gears 30 rotate in reverse.

[0118] Therefore, the tying wire W clamped between the pair of feeding gears 30 is fed in the reverse direction shown by arrow R.

[0119] The tying wire W wound around the steel bar S and clamped by the tying wire clamping body 70 is clamped in a form that the front end side portion sandwiched between the second side hook 70L and the center hook 70C will not come out from between the second side hook 70L and the center hook 70C. In addition, the tying wire W clamped by the tying wire clamping body 70 is clamped in a form that the portion sandwiched between the first side hook 70R and the center hook 70C can move in the circumferential direction of the loop Ru along the feeding path of the tying wire W between the first side hook 70R and the center hook 70C, and the radial movement of the tying wire W to the loop Ru is restricted.

[0120] Among the binding wires W wound around the steel bar S along the curling guide 50 and the guiding guide 51 and whose front ends are locked by the binding wire locking body 70, compared with the binding wire W1 on the first side of the curling guide 50, that is, the binding wire along the curling guide 50, the binding wire W2 on the second side of the steel bar S located on the side opposite to the curling guide 50, that is, the binding wire along the guiding guide 51, is closer to the locking position where the second side hook 70L and the central hook 70C lock the binding wire W. On the other hand, among the binding wires W wound around the steel bar S, in the direction along the feeding path of the binding wire W, the binding wire W1 along the curling guide 50 is closer to the binding wire feeding part 3A than the binding wire W2 along the guiding guide 51.

[0121] Thus, by the action of feeding the binding wire W in the direction opposite to the arrow R, first, the binding wire W1 along the curling guide 50 is pulled in the direction of the binding wire feeding part 3A, and thus moves in the direction approaching the steel bar S starting from the binding wire W1 along the curling guide 50.

[0122] In addition, the guiding member 53 that opens and closes in linkage with the movement of the sleeve 71 does not retract from the guiding position of the binding wire W when the sleeve 71 is at the end position of the first action area, as Figure 3B , Figure 3D shown, projects radially inward of the loop Ru of the binding wire W wound around the steel bar S.

[0123] Thus, as Figure 5C shown, by the action of feeding the binding wire W in the direction opposite to the arrow R, the binding wire W1 along the curling guide 50 cannot enter the inside from the guiding member 53. In this state, by feeding the binding wire W in the reverse direction, the binding wire W2 along the guiding guide 51 is pulled in the direction of the curling guide 50, and the binding wire W2 along the guiding guide 51 approaches the steel bar S.

[0124] When the reverse rotation of the feeding motor 31 is reversed until the binding wire W is pulled back by a predetermined amount and the binding wire W2 on one side along the guiding guide 51 contacts the steel bar S, the control unit 14A stops the driving of the feeding motor 31 in the reverse rotation direction. The control unit 14A determines the timing of stopping the feeding of the binding wire W in the reverse direction based on any one or a combination of the elapsed time since the start of the driving of the feeding motor 31 in the reverse rotation direction, the feeding amount of the binding wire W detected by the rotation amount of the feeding motor 31, etc., and the load applied to the binding wire W detected by the load applied to the feeding motor 31.

[0125] After stopping the driving of the feeding motor 31 in the reverse rotation direction, the feeding motor 31 is driven in the forward rotation direction, so that asFigure 5D As shown, the binding wire W1 on the curling guide 50 side is relaxed, and thus when the guide member 53 is pressed by the binding wire W, the pressing force is eliminated.

[0126] When the feed motor 31 is rotated forward until the binding wire W1 on the curling guide 50 side is loosened by a predetermined amount, the control unit 14A stops driving the feed motor 31 in the forward direction and then drives the motor 80 in the forward direction, thereby Figure 5E As shown, the sleeve 71 is moved in the forward direction indicated by the arrow A1 to the end position of the second operation range in which the guide member 53 is moved from the guide position to the retracted position.

[0127] When the sleeve 71 moves forward in the direction indicated by the arrow A1 to the end position of the second action area, as shown in FIG. Figure 3C , Figure 3E As shown, the guide member 53 retreats from the guiding position of the tying wire W. Before the action of retreating the guide member 53, the tying wire W on the side of the curling guide 50 is relaxed, thereby eliminating the pressure on the guide member 53 when it is pushed by the tying wire W. As a result, it is possible to suppress the load generated by the tying wire W from being applied to the guide member 53, and the guide member 53 can be reliably moved to the retreat position.

[0128] When the motor 80 is rotated forward until the sleeve 71 moves to the end position of the second operation range, the control unit 14A stops driving the motor 80 in the forward direction and then drives the feed motor 31 in the reverse direction, thereby feeding the binding wire W in the reverse direction indicated by arrow R.

[0129] When the sleeve 71 moves to the end position of the second operation range, the guide member 53 opened and closed in conjunction with the movement of the sleeve 71 moves from the guide position of the binding wire W to the retracted position as described above. Therefore, there is no protrusion that prevents the binding wire W from moving radially inward of the ring Ru of the binding wire W wound around the reinforcing bar S.

[0130] Therefore, if Figure 5F As shown, by feeding the binding wire W in the reverse direction, the binding wire W1 along one side of the crimping guide 50 is pulled toward the binding wire feeding portion 3A, and moves toward the reinforcing bar S, and the binding wire W is wound around the reinforcing bar S.

[0131] When the binding wire W is pulled back to the position where the binding wire W is wound around the reinforcing bar S, the control unit 14A stops driving the feed motor 31 in the reverse direction and then drives the motor 80 in the forward direction, thereby moving the sleeve 71 in the forward direction indicated by the arrow A1. The forward movement of the sleeve 71 is transmitted to the cutting unit 6A by the transmission mechanism 62, thereby rotating the movable blade unit 61. When the sleeve 71 moves to the end position of the third action range, the binding wire W locked by the first side hook 70R and the center hook 70C is cut by the action of the fixed blade unit 60 and the movable blade unit 61.

[0132] At substantially the same time as the binding wire W is cut, the curved portions 71c1 and 71c2 move toward the direction approaching the reinforcing steel bar S. As a result, the front end side of the binding wire W locked by the center hook 70C and the second side hook 70L is pushed toward the reinforcing steel bar S by the curved portion 71c1, so that the front end side of the binding wire W is bent toward the reinforcing steel bar S with the locked position as a fulcrum. As the sleeve 71 further moves forward, the binding wire W locked between the second side hook 70L and the center hook 70C is held in a state of being clamped by the curved portion 71c1.

[0133] In addition, the terminal end side of the tying wire W that is locked by the center hook 70C and the first side hook 70R and cut by the cutting portion 6A is pushed toward the steel bar S by the bending portion 71c2, so that the terminal end side of the tying wire W is bent toward the steel bar S with the locking position as a fulcrum. As the sleeve 71 further moves forward, the tying wire W locked between the first side hook 70R and the center hook is held in a state of being clamped by the bending portion 71c2.

[0134] After the front end and the terminal end of the tying wire W are bent toward the reinforcing bar S, the motor 80 is further driven in the forward direction, thereby further moving the sleeve 71 forward. When the sleeve 71 moves to a predetermined position and reaches the action range for twisting the tying wire W held by the tying wire holding body 70, the locking of the rotation limiting blade 74a and the rotation limiting claw 74b is released.

[0135] Thus, by further driving the motor 80 in the forward rotation direction, the binding wire locking body 70 rotates in conjunction with the rotating shaft 72, and the binding wire W is twisted.

[0136] In the action area where the sleeve 71 rotates, the steel bar S abuts against the abutment portion 91, and the movement of the steel bar S in the direction approaching the bundling portion 7A, i.e., the rearward direction, is restricted. Therefore, the bundling portion 7A applies a force to pull the bundling wire fixing body 70 forward along the axial direction of the rotating shaft 72 by twisting the bundling wire W.

[0137] The rotating shaft 72 is configured such that when a force for moving the binding wire fixing body 70 forward in the axial direction is applied to the binding wire fixing body 70, the rotating shaft 72 can move forward while being pushed backward by the spring 72c. Thus, in the operation region where the sleeve 71 rotates, the binding wire fixing body 70 and the rotating shaft 72 twist the binding wire W while moving forward.

[0138] The control unit 14A detects the load applied to the motor 80, and when it detects that the load applied to the motor reaches a predetermined value, for example, when the load reaches the maximum, it stops the forward rotation of the motor 80 at a predetermined timing.

[0139] Next, the control unit 14A reverses the motor 80. When the motor 80 is driven in the reverse rotation direction, the rotation restricting blade 74a engages with the rotation restricting claw 74b, whereby the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72 is restricted, and the sleeve 71 moves backward, i.e., in the direction of arrow A2.

[0140] When the sleeve 71 moves backward, the bending portions 71c1, 71c2 separate from the binding wire W, and the holding of the binding wire W by the bending portions 71c1, 71c2 is released. Further, when the sleeve 71 moves backward, the opening and closing pin 71a passes through the opening and closing guide hole 73. Thus, the first side hook 70R moves in a direction away from the center hook 70C by a rotational movement about the shaft 71b as a fulcrum. Further, the second side hook 70L moves in a direction away from the center hook 70C by a rotational movement about the shaft 71b as a fulcrum. Thus, the binding wire W is disengaged from the binding wire fixing body 70.

[0141] <Example of the effect of the steel bar tying machine>

[0142] In a conventional tying machine, in a state where the binding wire W is wound around the steel bar S along the curling guide 50 and the guiding guide 51, after the binding wire W is fixed by the binding wire fixing body 70, in a state where the guiding member 53 is moved from the guiding position of the binding wire W to the retracted position, the binding wire W is fed in the reverse direction.

[0143] In this case, in the direction of the feeding path of the binding wire W wound around the steel bar S along the curling guide 50 and the guiding guide 51, the binding wire W1 at the portion along the curling guide 50 closer to the binding wire feeding portion 3A moves in a direction approaching the steel bar S. When the binding wire W1 at the portion along the curling guide 50 moves to a position in contact with the steel bar S, due to the friction between the binding wire W and the steel bar S, the load for feeding the binding wire W in the reverse direction becomes large. Therefore, the binding wire W2 at the portion along the guiding guide 51 on the side opposite to the curling guide 50 with respect to the steel bar S cannot be sufficiently pulled back, and there is a possibility that the binding wire W cannot be wound around the steel bar S.

[0144] In contrast, in the steel bar bundling machine 1A of the present embodiment, as described above, in a state where the binding wire W is wound around the steel bar S along the curling guide 50 and the guiding guide 51, after the binding wire W is locked by the binding wire locking body 70, the binding wire W is fed in the reverse direction in a state where the guiding member 53 protrudes to the guiding position of the binding wire W.

[0145] As a result, the following state is achieved: Among the binding wires W wound around the steel bar S and locked by the binding wire locking body 70, the binding wire at the portion close to the binding wire feeding portion 3A that can move in the circumferential direction of the loop Ru along the feeding path of the binding wire W, that is, the binding wire W1 along the curling guide 50, is restricted by the guiding member 53 from moving in the direction approaching the steel bar S. In this state, first, the binding wire at the portion close to the front end side of the binding wire W that is locked by the binding wire locking body 70 and does not move in the circumferential direction of the loop Ru along the feeding path of the binding wire W, that is, the binding wire W2 along the guiding guide 51, which is the binding wire on the side opposite to the curling guide 50 with respect to the steel bar S, is moved in the direction approaching the steel bar S, whereby the binding wire W2 along the guiding guide 51 comes into contact with the steel bar S. Then, by further feeding the binding wire W in the reverse direction in a state where the guiding member 53 is moved from the guiding position of the binding wire W to the retracted position, as Figure 5F shown, the binding wire W1 along the curling guide 50 is moved in the direction approaching the steel bar S, and the binding wire W1 along the curling guide 50 comes into contact with the steel bar S, whereby the binding wire W can be reliably wound around the steel bar S.

[0146] <Modification example of steel bar bundling machine>

[0147] Figure 6A is a side view showing an example of the guiding member moving mechanism of the second embodiment, Figure 6B 、 Figure 6C is a bottom view cross-sectional view showing an example of the operation of the guiding member moving mechanism of the second embodiment, Figure 6D 、 Figure 6E is a front view cross-sectional view showing an example of the operation of the guiding member moving mechanism of the second embodiment. Next, an example of the guiding member moving mechanism of the second embodiment will be described with reference to the respective figures. In addition, Figure 6B 、 Figure 6C shows Figure 6A the C-C cross section of Figure 6D 、 Figure 6E shows Figure 6A the D-D cross section of

[0148] The guide member moving mechanism 54A of the first embodiment described above is configured to move the guide member 53 toward the retracted position by the force of a spring. In contrast, the guide member moving mechanism 54B of the second embodiment is configured to move the guide member 53 toward the guiding position by the force of a spring.

[0149] The guide member moving mechanism 54B of the second embodiment includes a guide member support portion 55B that mounts the guide member 53 and a guide member actuating portion 56B that actuates the guide member support portion 55B.

[0150] The guide member support portion 55B extends in the axial direction of the rotary shaft 72 as shown in Figure 2B , Figure 2C etc., and has the guide member 53 at one end. The guide member 53 has, for example, a rectangular parallelepiped shape and projects laterally from the guide member support portion 55B. In addition, a portion between one end side and the other end side of the guide member support portion 55B is rotatably supported by a shaft 55G. The axial direction in which the shaft 55G extends, i.e., the axial direction, is the vertical direction orthogonal to the extending direction of the guide member 53. Further, the guide member support portion 55B has a portion to be acted upon 55J at the other end side, and the portion to be acted upon 55J performs a rotational motion and release of the rotational motion about the shaft 55G by being pushed by the guide member actuating portion 56B.

[0151] The guide member 53 projects into the feeding path of the binding wire W in the curling guide 50 by the rotational motion of the guide member support portion 55B about the shaft 55G, and moves between the guiding position where a crease is imparted to the binding wire W and the retracted position where it retracts laterally from the feeding path of the binding wire W in the curling guide 50.

[0152] The guide member actuating portion 56B extends in the axial direction of the rotary shaft 72, and is supported by a guide projection 56F so that it can move along the axial direction of the rotary shaft 72, i.e., the moving direction of the sleeve 71, between one end side and the other end side. The guide member actuating portion 56B is linked to the sleeve 71 that moves by the rotation of the rotary shaft 72 and moves in the axial direction of the rotary shaft 72, i.e., the front-rear direction. In addition, the guide member actuating portion 56B has an acting portion 56J that pushes the portion to be acted upon 55J of the guide member support portion 55B at one end side. Further, the guide member actuating portion 56B has an engaging portion 56G that engages with the sleeve 71 at the other end side.

[0153] The guide member moving mechanism 54B includes a spring 57B that biases the guide member 55A in the direction in which the guide member 53 moves toward the guiding position. The spring 57B is formed of a torsion spiral spring and is mounted on the shaft 55G.

[0154] As Figure 6BAs shown, when the actuating portion 56B of the guide member moves to a position where the actuating portion 56J of the guide member actuating portion 56B leaves the actuated portion 55J of the guide member supporting portion 55B, the guide member moving mechanism 54B releases the restriction on the rotation of the guide member supporting portion 55B about the shaft 55G. Thus, as Figure 6B , Figure 6D shown, the guide member 53 is urged by the spring 57B and moves to the guiding position.

[0155] In contrast, in the guide member moving mechanism 54B, as Figure 6C shown, when the actuating portion 56B of the guide member moves to a position where the actuating portion 56J of the guide member actuating portion 56B presses the actuated portion 55J of the guide member supporting portion 55B, the guide member supporting portion 55B is pressed by the guide member actuating portion 56B and rotates, and the rotation of the guide member supporting portion 55B caused by the spring 57B is restricted. Thus, as Figure 6C , Figure 6E shown, the guide member 53 moves from the guiding position to the retracted position.

[0156] Figure 7A is a side view showing an example of the guide member moving mechanism of the third embodiment, Figure 7B is a bottom view cross-sectional view showing an example of the operation of the guide member moving mechanism of the third embodiment, Figures 7C - 7F is a front view cross-sectional view showing an example of the operation of the guide member moving mechanism of the third embodiment. Next, an example of the guide member moving mechanism of the third embodiment will be described with reference to the respective drawings. In addition, Figure 7B shows Figure 7A the E-E cross-section of Figure 7C , Figure 7E shows Figure 7A the F-F cross-section of Figure 7D , Figure 7F shows Figure 7A the G-G cross-section of

[0157] The guide member moving mechanism 54C of the third embodiment includes, in addition to the guide member 53 that imparts a crease to the binding wire W, a guide member 53C that restricts the movement of the binding wire W when pulling back the binding wire W. The guide member 53C constitutes a pulling-in unit that pulls in the binding wire W from a predetermined side in cooperation with the binding wire feeding portion 3A, and the guide member 53C is configured to be able to operate independently of the sleeve 71. In addition, regarding the guide member moving mechanism 54A that moves the guide member 53, it may have the same structure as that described using Figures 3A - 3E .

[0158] The guide member moving mechanism 54C of the third embodiment includes a spring 57C that biases the guide member 53C in the direction of moving toward the guide position that restricts the movement of the binding wire W when the binding wire W is retracted. The guide member 53C includes an inducing portion 53G. The front end side of the inducing portion 53G that contacts the binding wire W is configured to be conical, for example, and generates a force that moves the guide member 53C from the guide position to the retracted position. In the guide member 53C, when the binding wire W contacts the inducing portion 53G when the binding wire W is retracted, a force is generated that pushes the guide member 53C in the direction of moving from the guide position to the retracted position.

[0159] The operation of the guide member moving mechanism 54A that moves the guide member 53 is as described above. As Figure 7B shown, when the guide member operating portion 56A moves to the position where the acting portion 56H of the guide member operating portion 56A presses the acted portion 55H of the guide member supporting portion 55A, the guide member moving mechanism 54A restricts the rotation of the guide member supporting portion 55A about the shaft 55G. Thus, as Figure 7C shown, the guide member 53 moves to the guide position.

[0160] In contrast, when the guide member operating portion 56A moves to the position where the acting portion 56H of the guide member operating portion 56A leaves the acted portion 55H of the guide member supporting portion 55A, the guide member moving mechanism 54A releases the restriction on the rotation of the guide member supporting portion 55A about the shaft 55G. Thus, as Figure 7E shown, the guide member supporting portion 55A is biased by the spring 57A to rotate, and the guide member 53 moves from the guide position to the retracted position.

[0161] In the state where the guide member 53 has moved to the retracted position, when the binding wire W is fed in the opposite direction and retracted, as Figure 7D shown, by the guide member 53C moving to the guide position, the state is formed in which the binding wire W along the portion of the curling guide 50 is restricted from moving in the direction approaching the reinforcing bar S. Thus, first, the binding wire W along the portion of the inducing guide 51 can be moved in the direction approaching the reinforcing bar S to contact the reinforcing bar S.

[0162] By further feeding the binding wire W in the opposite direction from the state where the binding wire W contacts the guide member 53C, the inducing portion 53G generates a force that pushes the guide member 53C in the direction of moving from the guide position to the retracted position. As Figure 7F shown, while compressing the spring 57C, the guide member 53C moves to the retracted position. Thus, the binding wire W along the portion of the curling guide 50 moves past the guide member 53C in the direction approaching the reinforcing bar S and can contact the reinforcing bar S.

[0163] Figure 8A is a side view showing an example of a guiding member representing other modified examples, Figure 8B is a front cross-sectional view showing an operation example of a guiding member representing other modified examples. Next, an example of a guiding member of other modified examples will be described with reference to each drawing. In addition, Figure 8B shows Figure 8A the H-H cross-section.

[0164] A guiding member 53H of other modified examples is arranged at a position where a crease is imparted to the binding wire W and is fixed to the curling guide 50. The guiding member 53H constitutes a pulling-in unit that restricts the movement of the binding wire W when pulling back the binding wire W and pulls in the binding wire W from a predetermined side in cooperation with the binding wire feeding portion 3A.

[0165] The guiding member 53H includes a guiding portion 53J for guiding the binding wire W, and a portion of the guiding portion 53J that contacts the binding wire W fed in the opposite direction by the binding wire feeding portion 3A is configured to be conical, for example. When the binding wire W fed in the opposite direction by the binding wire feeding portion 3A contacts the guiding portion 53J, the guiding member 53H guides the binding wire W wound around the steel bar S toward the inner side in the radial direction of a loop Ru formed by the binding wire W wound around the steel bar S. The guiding member 53H forms a gap through which the binding wire W can pass between the guiding portion 53J and the opposing curling guide 50.

[0166] When the binding wire W wound around the steel bar S is fed in the opposite direction and pulled back, when the binding wire W contacts the curling member 53H, a state is formed in which the guiding member 53H restricts the movement of the binding wire W along the curling guide 50 toward the direction approaching the steel bar S. Thus, first, the binding wire W along the guiding guide 51 can be moved toward the direction approaching the steel bar S to contact the steel bar S.

[0167] By further feeding the binding wire W in the opposite direction from the state where the binding wire W contacts the guiding member 53H, the binding wire W contacting the guiding member 53H mimics the shape of the guiding portion 53J and is guided toward the inner side in the radial direction of the loop Ru formed by the binding wire W wound around the steel bar S. Thus, the binding wire W along the curling guide 50 can move over the guiding member 53H toward the direction approaching the steel bar S, and thereby can contact the steel bar S.

[0168] Figure 9 is a side view of a main part showing a modified example of a bundling machine. The bundling machine 1B of the modified example is configured such that the curling forming portion 5B includes a curling guide 50 as an example of a first guiding portion and does not include the Figure 1 such as the guiding guide 51 shown.

[0169] The curling guide 50 imparts a crease to the tying wire W fed by the tying wire feeding section 3A and guides the tying wire W to the tying section 7A. As a result, the tying wire W is wound around the reinforcing bar S.

[0170] In the tying machine 1B, with the tying wire W wound around the reinforcing bar S along the curling guide 50, after the tying wire W is clamped by the tying wire clamping body 70, the tying wire W is fed in the reverse direction with the guide member 53 protruding to the guiding position of the tying wire W.

[0171] As a result, the following state is achieved: in the tying wire W wound around the reinforcing bar S and clamped by the tying wire clamping body 70, the tying wire at the portion close to the tying wire feeding section 3A that can move in the circumferential direction of the loop Ru along the feeding path of the tying wire W, that is, the tying wire W along the curling guide 50, is restricted by the guide member 53 from moving in the direction approaching the reinforcing bar S. In this state, first, the tying wire W at the portion close to the front end side of the tying wire W clamped by the tying wire clamping body 70 and not moving in the circumferential direction of the loop Ru along the feeding path of the tying wire W, that is, the tying wire W on the side opposite to the curling guide 50 with respect to the reinforcing bar S, is moved in the direction approaching the reinforcing bar S, thereby coming into contact with the reinforcing bar S. Then, by further feeding the tying wire W in the reverse direction with the guide member 53 moved from the guiding position of the tying wire W to the retracted position, the tying wire W along the curling guide 50 is moved in the direction approaching the reinforcing bar S and comes into contact with the reinforcing bar S, whereby the tying wire W can be reliably wound around the reinforcing bar S.

[0172] Figure 10 It is a side view of the main part showing another modified example of the tying machine. The curling forming section 5C of the tying machine 1C of the other modified example includes a curling guide 50C and a guiding guide 51C. The curling forming section 5C is configured such that at least one of the curling guide 50C and the guiding guide 51C can move in the direction approaching and leaving the other to open and close, and in the state where the curling guide 50C and the guiding guide 51C are closed, they are in a form where the curling guide 50C and the guiding guide 51C are connected.

[0173] The curling guide 50C imparts a crease to the tying wire W fed by the tying wire feeding section 30. The guiding guide 51C guides the tying wire W imparted with a crease by the curling guide 50C to the tying section 7A. As a result, the tying wire W is wound around the reinforcing bar S.

[0174] In the tying machine 1C, with the tying wire W wound around the reinforcing bar S along the curling guide 50C and the guiding guide 51C, after the tying wire W is clamped by the tying wire clamping body 70, the tying wire W is fed in the reverse direction with the guide member 53 protruding to the guiding position of the tying wire W.

[0175] As a result, the following state is obtained: in the binding wire W wound around the steel bar S and fixed by the binding wire fixing body 70, the binding wire at the portion close to the binding wire feeding portion 3A that can move in the circumferential direction of the loop Ru along the feeding path of the binding wire W, that is, the binding wire W along the curling guide 50C, is restricted by the guide member 53 from moving in the direction approaching the steel bar S. In this state, first, the binding wire at the portion close to the front end side of the binding wire W that is fixed by the binding wire fixing body 70 and does not move in the circumferential direction of the loop Ru along the feeding path of the binding wire W, that is, the binding wire W along the guiding guide 51C which is the binding wire on the side opposite to the curling guide 50 with respect to the steel bar S, is moved in the direction approaching the steel bar S to contact the steel bar S. Then, by further feeding the binding wire W in the reverse direction in a state where the guide member 53 is moved from the guiding position of the binding wire W to the retracted position, the binding wire W along the curling guide 50C is moved in the direction approaching the steel bar S to contact the steel bar S, whereby the binding wire W can be reliably wound around the steel bar S.

Claims

1. A steel bar bundling machine, comprising: A binding wire feeding unit that feeds binding wire in the forward and reverse directions; A curling guide having a first guiding member that guides the binding wire to impart a curl mark to the binding wire fed in the forward direction by the binding wire feeding unit and wind the binding wire around the steel bar, thereby forming a loop as a binding wire path; A bundling unit having a binding wire locking body that locks the front end side of the binding wire fed in the forward direction by the binding wire feeding unit and twists the binding wire fed in the reverse direction after the loop is formed around the steel bar; and A guiding guide located on the side opposite to the curling guide with respect to the steel bar, guiding the binding wire with a curl mark imparted by the curling guide to the bundling unit, The curling guide is closer to the binding wire feeding unit than the guiding guide in the direction along the feeding path of the binding wire, The curling guide is provided with a pulling-in unit that causes the second side binding wire portion of the binding wire forming the loop and located on the guiding guide side to be pulled in toward the steel bar earlier than the first side binding wire portion located on the curling guide side, The pulling-in unit has a second guiding member fixed to the curling guide, which restricts the movement of the binding wire toward the inner side in the radial direction of the loop when the binding wire feeding unit feeds the binding wire in the reverse direction, The second guiding member has a conical guiding portion that contacts the binding wire when the binding wire feeding unit feeds the binding wire in the reverse direction and guides the binding wire wound around the steel bar toward the inner side in the radial direction of the loop.

2. The steel bar bundling machine according to claim 1, wherein The second guiding member forms a gap through which the binding wire can pass between the second guiding member and the curling guide opposite thereto.

3. The steel bar bundling machine according to claim 2, wherein The guiding portion includes a surface that is inclined in the axial direction of the loop toward the gap and inclined in the radial direction of the loop toward the inner side of the loop.

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