Steel bar tying machine

Abstract

The present invention provides a bundling machine for winding a bundling wire around a bundle. The reinforcing steel bar bundling machine (1A) comprises: a bundling wire feeding section (3A) for feeding a bundling wire (W); a curling forming section (5A) for forming a feeding path for the bundling wire fed in a forward direction by the bundling wire feeding section and wound around a reinforcing steel bar (S); and a bundling section (7A) for twisting the bundling wire fed in a reverse direction by the bundling wire feeding section and wound around the reinforcing steel bar. The curling forming section comprises a curling guide (50) having a guide component (53) for imparting a curl mark to the bundling wire and an induction guide (51) for inducing the bundling wire imparted with a curl mark by the curling guide to the bundling section, so that the action of feeding the bundling wire in a reverse direction by the bundling wire feeding section and the action of retracting the guide component are linked, so that the bundling wire along the induction guide is pulled toward the direction of the reinforcing steel bar before the bundling wire along the curling guide.

Description

Technical Field

[0001] The invention relates to a bundling machine for bundling objects such as steel bars by using bundling wires. Background Art

[0002] In concrete buildings, steel bars are used to increase strength, and are tied with tying wires during concrete pouring to prevent the steel bars from shifting from their intended positions.

[0003] Conventionally, a tying machine called a steel bar tying machine has been proposed, which winds a tying wire around two or more steel bars, and twists the tying wire wound around the steel bars to tie the two or more steel bars with the tying wire. The tying machine includes: a tying wire feeding mechanism that feeds the tying wire wound around a reel and winds it around the steel bars; a gripping mechanism that grasps the tying wire wound around the steel bars; and a tying wire twisting mechanism that rotates and drives the gripping mechanism to twist the tying wire, and the tying wire feeding mechanism, the gripping mechanism, and the tying wire twisting mechanism are sequentially operated by a trigger operation, thereby performing a tying operation in one cycle.

[0004] When steel bars are tied with a tying wire, if the tying is loose, the steel bars will be misaligned, so it is required to firmly hold the steel bars. Therefore, a technology of feeding the tying wire wound around the steel bars in the reverse direction to be wound around the steel bars has been proposed (for example, refer to Patent Document 1).

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2004-142813

[0008] In a conventional tying machine, after the tying wire is wound around the reinforcing bars along the machine head and the lower guide arm, the tying wire is clamped by a clamp device and then fed in the reverse direction.

[0009] In this case, among the binding wires wound around the steel bar, the binding wires along the machine head move toward the steel bar. When the binding wires along the machine head move to a position in contact with the steel bar, the load for feeding the binding wires in the reverse direction increases due to the friction between the binding wires and the steel bar. Therefore, the binding wires along the lower guide arm cannot be fully pulled back, and there is a possibility that the binding wires cannot be wound around the steel bar. Summary of the invention

[0010] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a tying machine that winds a tying wire around a tying object.

[0011] The tying wire of the present invention is a kind of tying machine, and it comprises: a tying wire feeding part, which feeds tying wire; a curling guide, which gives a curl mark to the tying wire fed in the forward direction by the tying wire feeding part; and a tying part, which twists the tying wire fed in the reverse direction by the tying wire feeding part and wound around the tying object, and the tying part comprises a tying wire locking body, which locks the front end side of the tying wire fed in the forward direction by the tying wire feeding part and given a curl mark by the curling guide and wound around the tying object, and the tying machine comprises a pulling unit, which pulls the second side tying wire located on the opposite side of the curling guide relative to the tying object, of the tying wire wound around the tying object and with the front end locked, toward the direction of the tying object before the first side tying wire located on the curling guide.

[0012] In the present invention, the second side tying wire located on the opposite side of the curling guide relative to the tying object among the tying wires wound around the tying object and having the front end locked is first pulled toward the tying object, and then the first side tying wire located on the curling guide is pulled toward the tying object.

[0013] Effects of the Invention

[0014] Among the tying wires wound around the bundle and having their front ends locked, the first-side tying wires located at the curling guide have less influence from the friction caused by the contact between the tying wires and the bundle due to the action of feeding the tying wires in the reverse direction. Thus, the tying wires can be reliably wound around the bundle by first pulling the second-side tying wire located at the opposite side of the curling guide relative to the bundle toward the bundle and then pulling the first-side tying wire located at the curling guide toward the bundle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram showing an example of the overall structure of the reinforcing bar binding machine as seen from the side.

[0016] Figure 2A It is a perspective view showing an example of a bundling portion.

[0017] Figure 2B It is a cross-sectional plan view showing an example of a bundling portion.

[0018] Figure 2C It is a cross-sectional plan view showing an example of a bundling portion.

[0019] Figure 3A This is a side view showing an example of the guide member retracting mechanism according to the first embodiment.

[0020] Figure 3B It is a bottom cross-sectional view showing an operation example of the guide member retracting mechanism according to the first embodiment.

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

[0022] Figure 3D It is a front cross-sectional view showing an operation example of the guide member retracting mechanism according to the first embodiment.

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

[0024] Figure 4 This is a block diagram showing an example of the control function of the reinforcing bar binding machine.

[0025] Figure 5A This is an operation explanation diagram showing an example of the operation of bundling reinforcing bars using the reinforcing bar bundling machine.

[0026] Figure 5B This is an operation explanation diagram showing an example of the operation of bundling reinforcing bars using the reinforcing bar bundling machine.

[0027] Figure 5C This is an operation explanation diagram showing an example of the operation of bundling reinforcing bars using the reinforcing bar bundling machine.

[0028] Figure 5D This is an operation explanation diagram showing an example of the operation of bundling reinforcing bars using the reinforcing bar bundling machine.

[0029] Figure 5E This is an operation explanation diagram showing an example of the operation of bundling reinforcing bars using the reinforcing bar bundling machine.

[0030] Fig. 5F This is an operation explanation diagram showing an example of the operation of bundling reinforcing bars using the reinforcing bar bundling machine.

[0031] Fig. 6A It is a side view showing an example of the guide member retracting mechanism according to the second embodiment.

[0032] Figure 6B It is a bottom cross-sectional view showing an operation example of the guide member retracting mechanism according to the second embodiment.

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

[0034] Fig.6D It is a front cross-sectional view showing an operation example of the guide member retracting mechanism according to the second embodiment.

[0035] Fig. 6E It is a front cross-sectional view showing an operation example of the guide member retracting mechanism according to the second embodiment.

[0036] Fig. 7AIt is a side view showing an example of the guide member retracting mechanism according to the third embodiment.

[0037] Figure 7B It is a bottom cross-sectional view showing an operation example of the guide member retracting mechanism according to the third embodiment.

[0038] Figure 7C It is a front cross-sectional view showing an operation example of the guide member retracting mechanism according to the third embodiment.

[0039] Fig.7D It is a front cross-sectional view showing an operation example of the guide member retracting mechanism according to the third embodiment.

[0040] Fig. 7E It is a front cross-sectional view showing an operation example of the guide member retracting mechanism according to the third embodiment.

[0041] Figure 7F It is a front cross-sectional view showing an operation example of the guide member retracting mechanism according to the third embodiment.

[0042] Fig. 8A It is a side view showing an example of a guide member according to another modified example.

[0043] Figure 8B It is a front cross-sectional view showing an operation example of a guide member according to another modified example.

[0044] Fig. 9 It is a side view of the main parts showing a modified example of the strapping machine.

[0045] Fig.10 It is a side view of the main parts showing another modified example of the strapping machine. DETAILED DESCRIPTION

[0046] Hereinafter, an example of a reinforcing bar tying machine as an embodiment of the tying machine of the present invention will be described with reference to the drawings.

[0047] <Structure example of reinforcing bar tying machine>

[0048] Figure 1 1A is a structural diagram showing an example of the overall structure of the reinforcing bar binding machine as seen from the side. The reinforcing bar binding machine 1A is in a form that an operator uses by hand, and includes a main body 10A and a handle 11A.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The curl forming section 5A includes guide members 53 and 53b that guide the tying wire W fed in the forward direction and give a curl mark to the tying wire W. The guide member 53 constitutes a pulling unit that pulls the tying wire W from a predetermined side by cooperating with the tying wire feeding section 3A. The guide member 53 is provided on the introduction side of the tying wire W fed by the tying wire feeding section 3A in the curl guide 50, and is arranged on the radial inner side of the loop Ru formed by the tying wire W. The guide member 53 restricts the tying wire W so that the tying wire W does not enter the radial inner side of the loop Ru.

[0056] The guide member 53 b is provided on the discharge portion side of the tying wire W fed by the tying wire feeding portion 3A in the curling guide 50 , and is arranged on the radially outer side of the loop Ru formed by the tying wire W.

[0057] The curl forming section 5A includes a guide member moving mechanism 54A for retracting the guide member 53. The guide member moving mechanism 54A constitutes a pulling unit for pulling the tying wire W from a predetermined side in cooperation with the tying wire feeding section 3A, and after the tying wire W is wound around the reinforcing bar S, the guide member 53 is retracted in conjunction with the operation of the tying section 7A.

[0058] The cutting section 6A includes a fixed blade section 60, a movable blade section 61 that cuts the tying wire W by cooperating with the fixed blade section 60, and a transmission mechanism 62 that transmits the movement of the tying section 7A to the movable blade section 61. The cutting section 6A cuts the tying wire W by the rotation of the movable blade section 61 with the fixed blade section 60 as a fulcrum axis. The transmission mechanism 62 transmits the movement of the tying section 7A to the movable blade section 61 via the moving member 83, and rotates the movable blade section 61 in conjunction with the movement of the tying section 7A to cut the tying wire W.

[0059] The binding portion 7A includes a binding wire locking body 70 for locking the binding wire W. A detailed embodiment of the binding portion 7A will be described later. The driving portion 8A includes a motor 80 and a speed reducer 81 for reducing speed and amplifying torque.

[0060] The reinforcing bar tying machine 1A includes a feed restricting portion 90 that contacts the front end of the tying wire W on the feeding path of the tying wire W locked by the tying wire locking body 70. In addition, in the reinforcing bar tying machine 1A, the curling guide 50 and the guiding guide 51 of the curl forming portion 5A are provided at the front end of the main body 10A. Moreover, the contact portion 91 of the reinforcing bar tying machine 1A that contacts the reinforcing bar S is provided between the curling guide 50 and the guiding guide 51 at the front end of the main body 10A.

[0061] The handle 11A of the reinforcing bar tying machine 1A extends downward from the main body 10A. A battery 15A is detachably mounted on the lower portion of the handle 11A. The material box 2A of the reinforcing bar tying machine 1A is provided in front of the handle 11A. The reinforcing bar tying machine 1A accommodates the above-mentioned tying wire feeding unit 3A, cutting unit 6A, tying unit 7A, driving unit 8A for driving the tying unit 7A, etc. in the main body 10A.

[0062] The reinforcing bar binding machine 1A has a trigger 12A provided on the front side of a handle 11A, and a switch 13A provided inside the handle 11A. In addition, a substrate 100 on which a circuit constituting a control unit is mounted is provided on the main body 10A.

[0063] Figure 2A is a perspective view showing an example of a bundling portion, Figure 2B , Figure 2C 1 is a cross-sectional plan view showing an example of a bundling portion. Next, the structure of the bundling portion will be described with reference to each figure.

[0064] The binding section 7A includes a binding wire locking body 70 for locking the binding wire W and a rotating shaft 72 for moving the binding wire locking body 70 . The rotating shaft 72 of the binding section 7A is connected to a motor 80 of the driving section 8A via a speed reducer 81 , and the rotating shaft 72 is driven by the motor 80 via the speed reducer 81 .

[0065] The tying wire fixing body 70 includes: a center hook 70C connected to a rotating shaft 72; a first side hook 70R and a second side hook 70L that open and close relative to the center hook 70C; and a sleeve 71 that moves the first side hook 70R and the second side hook 70L and forms the tying wire W into a desired shape.

[0066] In the bundling 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 and the speed reducer 81 are connected is the rear side.

[0067] The center hook 70C is connected to the front end, which is one end of the rotating shaft 72 , via a structure that is rotatable relative to the rotating shaft 72 and movable in the axial direction integrally with the rotating shaft 72 .

[0068] The first side hook 70R has one end, i.e., the front end, located on one side of the center hook 70C along the axial direction of the rotation shaft 72. The first side hook 70R has the other end, i.e., the rear end, rotatably supported by the center hook 70C via the shaft 71b.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] The binding wire fixing body 70 moves in the rear direction indicated by the arrow A2 through the sleeve 71, so that 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 in the direction away from the center hook 70C by rotating around the shaft 71b as a fulcrum.

[0077] Thus, the first side hook 70R and the second side hook 70L are opened relative to the center hook 70C, and a feed path through which the tying wire W passes 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.

[0078] In a state where the first side hook 70R and the second side hook 70L are opened relative to the center hook 70C, the tying wire W fed by the tying wire feeding section 3A passes between the center hook 70C and the first side hook 70R. The tying wire W passing between the center hook 70C and the first side hook 70R is guided to the curl forming section 5A. Furthermore, the tying wire W given a curl mark by the curl forming section 5A and guided to the tying section 7A passes between the center hook 70C and the second side hook 70L.

[0079] The binding wire fixing body 70 is moved forward in the direction indicated by the arrow A1 through the sleeve 71, so that the first side hook 70R and the second side hook 70L are moved toward the direction approaching the center hook 70C by rotating around the shaft 71b as a fulcrum according to the trajectory of the opening and closing pin 71a and the shape of the opening and closing guide hole 73. As a result, the first side hook 70R and the second side hook 70L are closed relative to the center hook 70C.

[0080] When the first side hook 70R is closed relative to the center hook 70C, the tying wire W sandwiched between the first side hook 70R and the center hook 70C is locked in a state where it can move between the first side hook 70R and the center hook 70C. In addition, when the second side hook 70L is closed relative to the center hook 70C, the tying wire W sandwiched between the second side hook 70L and the center hook 70C is locked in a state where it will not come out from between the second side hook 70L and the center hook 70C.

[0081] The sleeve 71 includes: a bending portion 71c1, which forms the tying wire W into a predetermined shape by bending one end, i.e., the front end side, of the tying wire W in a predetermined direction; and a bending portion 71c2, which forms the tying wire W into a predetermined shape by bending the other end, i.e., the terminal side, of the tying wire W cut by the cutting portion 6A in a predetermined direction.

[0082] The sleeve 71 moves in the forward direction indicated by the arrow A1, so that the front end side of the tying wire W held by the center hook 70C and the second side hook 70L is pushed by the bending portion 71c1, so that the front end side of the tying wire W is bent toward the steel bar S. In addition, the sleeve 71 moves in the forward direction indicated by the arrow A1, so that the terminal end side of the tying wire W held by the center hook 70C and the first side hook 70R and cut by the cutting portion 6A is pushed by the bending portion 71c2, so that the terminal end side of the tying wire W is bent toward the steel bar S.

[0083] The binding part 7A includes a rotation restricting part 74 that restricts the rotation of the binding wire locking body 70 and the sleeve 71 in conjunction with the rotation of the rotating shaft 72. The rotation restricting part 74 includes a rotation restricting blade 74a provided on the sleeve 71 and a rotation restricting claw 74b provided on the main body 10A.

[0084] The rotation restricting blade 74a is configured by providing a plurality of protrusions protruding radially from the outer circumference of the sleeve 71 at predetermined intervals 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.

[0085] The rotation limiting claw 74b includes a first claw portion 74b1 and a second claw portion 74b2 as a pair of claw portions facing each other at a distance through which the rotation limiting blade 74a can pass. The first claw portion 74b1 and the second claw portion 74b2 are configured to be able to retreat from the trajectory of the rotation limiting blade 74a by being pushed by the rotation limiting blade 74a according to the rotation direction of the rotation limiting blade 74a.

[0086] The rotation limiting portion 74 limits the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72 when the rotation limiting blade 74a and the rotation limiting claw 74b are locked, and the sleeve 71 moves in the forward and backward directions by the rotation of the rotating shaft 72. In addition, 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.

[0087] Figure 3A is a side view showing an example of the guide member moving mechanism according to the first embodiment, Figure 3B , Figure 3C is a bottom cross-sectional view showing an operation example of the guide member moving mechanism according to the first embodiment, Figure 3D , Figure 3E 1 is a front cross-sectional view showing an operation example 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. Figure 3B , Figure 3C Show Figure 3A AA section, Figure 3D , Figure 3E Show Figure 3ABB cross section.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 where it has moved to the guide position.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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 FIG. 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.

[0104] 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.

[0105] After the wire locking body 70 has locked the wire W, the control unit 14A causes the wire W to be wound around the reinforcing bar S by rotating the feed motor 31 in reverse to feed the wire W in the reverse direction and by moving the guide member 53 from the guide position of the wire W to the retreat position.

[0106] <Operation example of steel bar tying machine>

[0107] Figure 5A to Figure 5F 1A is an operation explanatory diagram showing an example of the operation of tying reinforcing bars by the reinforcing bar tying machine. Next, the operation of tying reinforcing bars S by the tying wire W by the reinforcing bar tying machine 1A will be described with reference to the respective diagrams.

[0108] In the reinforcing steel binding machine 1A, the state where the binding wire W is clamped between the pair of feed gears 30 and the front end of the binding wire W is located between the clamping position of the feed gears 30 and the fixed blade portion 60 of the cutting portion 6A becomes a standby state. Figure 2A , Figure 2B As shown, the first side hook 70R is opened relative to the center hook 70C, and the second side hook 70L is opened relative to the center hook 70C.

[0109] The reinforcing bar S is inserted between the curl guide 50 and the induction guide 51 of the curl forming section 5A. When the trigger 12A is operated, the control section 14A drives the feed motor 31 in the forward direction, and feeds the tying wire W in the forward direction indicated by the arrow F by the tying wire feed section 3A.

[0110] In the case of a configuration in which a plurality of, for example, two, binding wires W are fed, the two binding wires W are fed in parallel along the axial direction of the loop Ru formed by the binding wires W by a binding wire guide (not shown).

[0111] The binding wire W fed forward passes between the center hook 70C and the first side hook 70R, and is fed to the curl guide 50 of the curl forming portion 5A. The binding wire W passes through the curl guide 50, and thus a curl mark wound around the reinforcing bar S is provided.

[0112] like Figure 5A As shown, the tying wire W having a curl mark given by the curling guide 50 is guided by the guiding guide 51, and further fed in the positive direction by the tying wire feeding section 3A, thereby being guided by the guiding guide 51 to between the center hook 70C and the second side hook 70L. Figure 5B As shown, the tying wire W is fed until the front end thereof abuts against the feed restriction portion 90. When the front end of the tying wire W is fed to a position abutting against the feed restriction portion 90, the control portion 14A stops driving the feed motor 31.

[0113] After the feeding of the tying wire W in the forward direction is stopped, the control unit 14A drives the motor 80 in the forward direction. In the first operation area where the tying wire W is locked by the tying wire locking body 70, the sleeve 71 is locked by the rotation limiting blade 74a to the rotation limiting claw 74b, thereby limiting the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72. As a result, the rotation of the motor 80 is converted into linear movement, and the sleeve 71 moves in the arrow A1 direction, which is the forward direction.

[0114] When the sleeve 71 moves forward, the opening and closing pin 71a passes through the opening and closing guide hole 73. Figure 2C As shown, the first side hook 70R moves toward the center hook 70C by rotating about the shaft 71b. When the first side hook 70R is closed relative to the center hook 70C, the tying wire W sandwiched between the first side hook 70R and the center hook 70C is locked in a form that can move between the first side hook 70R and the center hook 70C.

[0115] In addition, the second side hook 70L moves toward the center hook 70C by rotating about the shaft 71b. When the second side hook 70L is closed relative to the center hook 70C, the tying wire W sandwiched between the second side hook 70L and the center hook 70C is locked so as not to slip out from between the second side hook 70L and the center hook 70C.

[0116] After the sleeve 71 is advanced to the end position of the first operation range where the first and second side hooks 70R and 70L are closed to lock the binding wire W, the control unit 14A temporarily stops the rotation of the motor 80 and drives the feed motor 31 in the reverse direction.

[0117] Therefore, the tying wire W sandwiched between the pair of feed gears 30 is fed in the reverse direction indicated by the arrow R.

[0118] The tying wire W wound around the reinforcing bar S and locked by the tying wire locking body 70 is locked in a state in which the portion on the front end side sandwiched between the second side hook 70L and the center hook 70C does not slip out from between the second side hook 70L and the center hook 70C. In addition, the tying wire W locked by the tying wire locking body 70 is locked in a state in which the portion sandwiched between the first side hook 70R and the center hook 70C can move between the first side hook 70R and the center hook 70C in the circumferential direction of the ring Ru along the feeding path of the tying wire W, and the movement of the tying wire W in the radial direction of the ring Ru is restricted.

[0119] Among the tying wires W wound around the reinforcing bar S along the curling guide 50 and the guiding guide 51 and whose front ends are locked by the tying wire locking body 70, the second side tying wire located on the opposite side of the curling guide 50 with respect to the reinforcing bar S, that is, the tying wire W2 located along the guiding guide 51, is closer to the locking position where the second side hook 70L and the center hook 70C lock the tying wire W than the first side tying wire located along the curling guide 50, that is, the tying wire W1 located along the curling guide 50. On the other hand, among the tying wires W wound around the reinforcing bar S, the tying wire W1 located along the curling guide 50 is closer to the tying wire feeding portion 3A than the tying wire W2 located along the guiding guide 51.

[0120] Thus, the binding wire W wound around the steel bar S is fed in the reverse direction indicated by the arrow R, and first, the binding wire W1 along the curling guide 50 is pulled in the direction of the binding wire feeding portion 3A, thereby moving from the binding wire W1 along the curling guide 50 in the direction approaching the steel bar S.

[0121] In addition, the guide member 53 that opens and closes in conjunction with the movement of the sleeve 71 does not retreat from the guide position of the tying wire W when the sleeve 71 is located at the end position of the first action range. Figure 3B , Figure 3D As shown in FIG. 1 , the tying wire W is protruded toward the radial inner side of the ring Ru of the tying wire W wound around the reinforcing bar S. As shown in FIG.

[0122] Therefore, if Figure 5C As shown, by feeding the tying wire W in the reverse direction indicated by the arrow R, the tying wire W1 along the portion of the curling guide 50 cannot enter the inner side from the guide member 53. In this state, by feeding the tying wire W in the reverse direction, the tying wire W2 along the portion of the induction guide 51 is pulled toward the curling guide 50, and the tying wire W2 along the portion of the induction guide 51 approaches the steel bar S.

[0123] When the feed motor 31 is reversed until the binding wire W is pulled back by a predetermined amount and the binding wire W2 along one side of the induction guide 51 contacts the reinforcing bar S, the control unit 14A stops the driving of the feed motor 31 in the reverse direction. The control unit 14A determines the timing to stop the feeding of the binding wire W in the reverse direction based on any one of the elapsed time since the driving of the feed motor 31 in the reverse direction was started, the feeding amount of the binding wire W detected by the rotation amount of the feed motor 31, and the load applied to the binding wire W detected by the load applied to the feed motor 31, or a combination thereof.

[0124] After the reverse driving of the feed motor 31 is stopped, the feed motor 31 is driven in the forward direction, so that Figure 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] Therefore, if Fig. 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] The rotating shaft 72 is configured so that when a force for moving the tying wire fixing body 70 forward in the axial direction is applied to the tying wire fixing body 70, the rotating shaft 72 can move forward while receiving a force for pushing the tying wire fixing body 70 backward by the spring 72c. Thus, in the action area where the sleeve 71 rotates, the tying portion 7A moves forward while twisting the tying wire W.

[0137] The control unit 14A detects the load applied to the motor 80 , and when it is detected that the load applied to the motor has reached a predetermined value, for example, the load has reached a maximum, the control unit 14A stops the forward rotation of the motor 80 at a predetermined timing.

[0138] Next, the control unit 14A reverses the motor 80. When the motor 80 is driven in the reverse direction, the rotation limiting blade 74a is locked with the rotation limiting claw 74b, thereby limiting the rotation of the sleeve 71 in conjunction with the rotation of the rotating shaft 72, and the sleeve 71 moves backward, that is, in the direction of arrow A2.

[0139] When the sleeve 71 moves in the rearward direction, the curved portions 71c1 and 71c2 are separated from the tying wire W, and the holding of the tying wire W by the curved portions 71c1 and 71c2 is released. In addition, when the sleeve 71 moves in the rearward direction, the opening and closing pin 71a passes through the opening and closing guide hole 73. As a result, the first side hook 70R moves in the direction away from the center hook 70C by rotating around the shaft 71b as a fulcrum. In addition, the second side hook 70L moves in the direction away from the center hook 70C by rotating around the shaft 71b as a fulcrum. As a result, the tying wire W is released from the tying wire fixing body 70.

[0140] <Example of the effect of steel bar tying machine>

[0141] In a conventional bundling machine, after the bundling wire W is wound around the steel bar S along the curling guide 50 and the induction guide 51, the bundling wire W is locked by the bundling wire locking body 70, and then the bundling wire W is fed in the reverse direction while the guide member 53 is moved from the guiding position of the bundling wire W to the retreat position.

[0142] In this case, in the direction of the feeding path of the binding wire W wound around the reinforcing bar S along the curling guide 50 and the guide 51, the binding wire W1 moves from the portion along the curling guide 50 close to the binding wire feeding section 3A toward the direction approaching the reinforcing bar S. When the binding wire W1 along the curling guide 50 moves to a position in contact with the reinforcing bar S, the load for feeding the binding wire W in the reverse direction increases due to the friction between the binding wire W and the reinforcing bar S. Therefore, the binding wire W2 along the portion of the guide 51 located on the opposite side of the reinforcing bar S from the curling guide 50 cannot be fully pulled back, and there is a possibility that the binding wire W cannot be wound around the reinforcing bar S.

[0143] On the other hand, in the reinforcing bar tying machine 1A of the present embodiment, as described above, after the tying wire W is wound around the reinforcing bar S along the curling guide 50 and the induction guide 51, the tying wire W is locked by the tying wire locking body 70, and then the tying wire W is fed in the reverse direction in a state where the guide member 53 protrudes to the guide position of the tying wire W.

[0144] Thus, a state is achieved in which, among the binding wires W wound around the reinforcing steel bar S and locked by the binding wire locking body 70, the binding wires W1 at a position 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 wires W1 at a position along the curling guide 50, are restricted by the guide member 53 from moving in a direction approaching the reinforcing steel bar S. In this state, first, the binding wires W2 at a position close to the front end side of the binding wires W that are locked by the binding wire locking body 70 and do not move in the circumferential direction of the loop Ru along the feeding path of the binding wires W, that is, the binding wires W2 at a position along the guiding guide 51 that is the binding wire located on the opposite side of the reinforcing steel bar S from the curling guide 50, are moved in a direction approaching the reinforcing steel bar S, thereby making the binding wires W2 at a position along the guiding guide 51 contact the reinforcing steel bar S. Then, by moving the guide member 53 from the guide position of the tying wire W to the retreat position, the tying wire W is further fed in the reverse direction. Fig. 5F As shown, the binding wire W1 along the crimping guide 50 is moved in a direction approaching the reinforcing steel bar S, and the binding wire W1 along the crimping guide 50 is brought into contact with the reinforcing steel bar S, whereby the binding wire W can be reliably wound around the reinforcing steel bar S.

[0145] <Modification of the steel bar tying machine>

[0146] Fig. 6A is a side view showing an example of a guide member moving mechanism according to the second embodiment, Figure 6B , Figure 6C is a bottom cross-sectional view showing an operation example of the guide member moving mechanism according to the second embodiment, Fig.6D , Fig. 6E 2 is a front cross-sectional view showing an operation example of the guide member moving mechanism of the second embodiment. Next, an example of the guide member moving mechanism of the second embodiment will be described with reference to each figure. Figure 6B , Figure 6C Show Fig. 6A The CC section, Fig.6D , Fig. 6E Show Fig. 6A DD section.

[0147] The guide member moving mechanism 54A of the first embodiment moves the guide member 53 to the retracted position using the force of a spring, whereas the guide member moving mechanism 54B of the second embodiment moves the guide member 53 to the guiding position using the force of a spring.

[0148] The guide member moving mechanism 54B of the second embodiment includes a guide member support portion 55B to which the guide member 53 is mounted and a guide member operating portion 56B to operate the guide member support portion 55B.

[0149] The guide member support portion 55B 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, for example, in the shape of a rectangular parallelepiped and protrudes laterally from the guide member support portion 55B. In addition, the portion between one end side and the other end side of the guide member support portion 55B 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 55B is provided with an action portion 55J at the other end side, and the action portion 55J is pushed by the guide member action portion 56B to perform a rotation action with the shaft 55G as a fulcrum and release the rotation action.

[0150] 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 55B 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.

[0151] The guide member action part 56B is supported by the guide protrusion 56F in a manner that it can move between one end side and the other end side along the axial direction of the rotating shaft 72, that is, the moving direction of the sleeve 71, in a form extending in the axial direction of the rotating shaft 72. The guide member action part 56B 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 56B has an action part 56J on one end side that pushes the acted part 55J of the guide member support part 55B. Moreover, the guide member action part 56B has an engagement part 56G that engages with the sleeve 71 on the other end side.

[0152] The guide member moving mechanism 54B includes a spring 57B that urges the guide member 55A in the direction in which the guide member 53 moves to the guide position. The spring 57B is composed of a torsion coil spring and is attached to the shaft 55G.

[0153] like Figure 6BAs shown in FIG. 1 , when the guide member action part 56B moves to a position where the action part 56J of the guide member action part 56B leaves the actioned part 55J of the guide member support part 55B, the guide member moving mechanism 54B releases the restriction on the rotation of the guide member support part 55B about the shaft 55G as a fulcrum. Figure 6B , Fig.6D As shown, the guide member 53 is urged by the spring 57B to move to the guiding position.

[0154] In contrast, in the guide member moving mechanism 54B, Figure 6C As shown in FIG. 1 , when the guide member actuating portion 56B moves to a position where the acting portion 56J of the guide member actuating portion 56B pushes the acted portion 55J of the guide member supporting portion 55B, the guide member supporting portion 55B is pushed 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, thereby Figure 6C , Fig. 6E As shown, the guide member 53 moves from the guiding position to the retracted position.

[0155] Fig. 7A is a side view showing an example of a guide member moving mechanism according to a third embodiment, Figure 7B is a bottom cross-sectional view showing an operation example of the guide member moving mechanism according to the third embodiment, Figure 7C to Figure 7F 1 is a front cross-sectional view showing an operation example 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 each figure. Figure 7B Show Fig. 7A EE cross section, Figure 7C , Fig. 7E Show Fig. 7A FF cross section, Fig.7D , Figure 7F Show Fig. 7A GG cross section.

[0156] The guide member moving mechanism 54C of the third embodiment includes, in addition to the guide member 53 for imparting a winding mark to the tying wire W, a guide member 53C for restricting the movement of the tying wire W when the tying wire W is pulled back. The guide member 53C constitutes a pulling unit for pulling the tying wire W from a predetermined side in cooperation with the tying wire feeding unit 3A, and the guide member 53C is configured to be able to move independently of the sleeve 71. In addition, the guide member moving mechanism 54A for moving the guide member 53 can be combined with a guide member 53C for limiting the movement of the tying wire W when the tying wire W is pulled back. Figure 3A to Figure 3E The described structure is the same.

[0157] The guide member moving mechanism 54C of the third embodiment includes a spring 57C that urges the guide member 53C in a direction to move to a guide position for restricting movement of the binding wire W when the binding wire W is pulled back. The guide member 53C includes a guide portion 53G, the front end side of which contacts the binding wire W is formed in a tapered shape, for example, and generates a force to move the guide member 53C from the guide position to the retreat position. In the guide member 53C, when the binding wire W contacts the guide portion 53G when the binding wire W is pulled back, a force is generated to push the guide member 53C in a direction to move from the guide position to the retreat position.

[0158] The guide member moving mechanism 54A that moves the guide member 53 operates as described above. Figure 7B 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 7C As shown, the guide member 53 moves to the guiding position.

[0159] On the other hand, when the guide member actuating portion 56A moves to a position where the acting portion 56H of the guide member actuating portion 56A is separated 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. Fig. 7E 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.

[0160] When the guide member 53 is moved to the retreat position, the tying wire W is fed in the reverse direction and pulled back. Fig.7D As shown, by moving the guide member 53C to the guide position, the guide member 53C restricts the movement of the binding wire W along the portion of the curling guide 50 in the direction approaching the reinforcing steel bar S. Thus, first, the binding wire W along the portion of the induction guide 51 can be moved in the direction approaching the reinforcing steel bar S and can come into contact with the reinforcing steel bar S.

[0161] By feeding the tying wire W further in the reverse direction from the state in which the tying wire W is in contact with the guide member 53C, the guiding portion 53G generates a force that pushes the guide member 53C in the direction of moving from the guiding position to the retreat position. Figure 7F As shown in FIG. 1 , the guide member 53C moves to the retracted position while the spring 57C is compressed. As a result, the binding wire W along the portion of the crimp guide 50 moves toward the direction approaching the reinforcing steel bar S over the guide member 53C and can contact the reinforcing steel bar S.

[0162] Fig. 8A is a side view showing an example of a guide member according to another modified example, Figure 8B 1 is a front cross-sectional view showing an operation example of a guide member of another modified example. Next, an example of a guide member of another modified example will be described with reference to each figure. Figure 8B Show Fig. 8A HH cross section.

[0163] The guide member 53H of another modified example is arranged at a position to give a winding mark to the binding wire W and is fixed to the curling guide 50. The guide member 53H restricts movement of the binding wire W when the binding wire W is pulled back and constitutes a pulling means for pulling the binding wire W from a predetermined side in cooperation with the binding wire feeding unit 3A.

[0164] The guide member 53H includes a guide portion 53J for guiding the tying wire W, and the portion of the guide portion 53J that contacts the tying wire W fed in the reverse direction by the tying wire feeding portion 3A is formed in a tapered shape, for example. The guide member 53H guides the tying wire W wound around the reinforcing bar S in the radially inner direction of the loop Ru formed by the tying wire W wound around the reinforcing bar S by causing the tying wire W fed in the reverse direction by the tying wire feeding portion 3A to contact the guide portion 53J. The guide member 53H forms a gap through which the tying wire W can pass between the guide portion 53J and the opposing curling guide 50.

[0165] When the binding wire W wound around the reinforcing bar S is fed in the reverse direction and pulled back, the binding wire W contacts the curling member 53H, and the binding wire W at the portion along the curling guide 50 is restricted by the guide member 53H from moving in the direction approaching the reinforcing bar S. Thus, first, the binding wire W at the portion along the induction guide 51 can be moved in the direction approaching the reinforcing bar S and contact the reinforcing bar S.

[0166] By further feeding the binding wire W in the reverse direction from the state where the binding wire W is in contact with the guide member 53H, the binding wire W in contact with the guide member 53H imitates the shape of the guiding portion 53J and is guided inward in the radial direction of the loop Ru formed by the binding wire W wound around the reinforcing steel bar S. As a result, the binding wire W along the portion of the curling guide 50 can pass over the guide member 53H and move in a direction close to the reinforcing steel bar S, thereby being able to contact the reinforcing steel bar S.

[0167] Fig. 9 1B is a side view of a main part of a modified example of a strapping machine. The strapping machine 1B of the modified example is configured such that the curl forming section 5B includes a curl guide 50 as an example of a first guide section, and does not include a curl guide 50 as an example of a second guide section. Figure 1 The induction guide 51 shown in the figure.

[0168] The curling guide 50 provides a curling mark to the binding wire W fed by the binding wire feeding section 3A and guides the binding wire W to the binding section 7A, whereby the binding wire W is wound around the reinforcing bars S.

[0169] In the tying machine 1B, after the tying wire W is wound around the reinforcing bar S along the curling guide 50 , the tying wire W is locked by the tying wire locking body 70 , and then the tying wire W is fed in the reverse direction with the guide member 53 protruding to the guide position of the tying wire W.

[0170] Thus, a state is achieved in which, among the tying wires W wound around the reinforcing steel bar S and locked by the tying wire locking body 70, the tying wires W at a position close to the tying wire feeding portion 3A that can move in the circumferential direction of the ring Ru along the feeding path of the tying wires W, that is, the tying wires W at a position along the curling guide 50 are restricted by the guide member 53 from moving in a direction approaching the reinforcing steel bar S. In this state, first, the tying wires W at a position close to the front end side of the tying wires W that are locked by the tying wire locking body 70 and do not move in the circumferential direction of the ring Ru along the feeding path of the tying wires W, that is, the tying wires W located on the side opposite to the curling guide 50 with respect to the reinforcing steel bar S, are moved in a direction approaching the reinforcing steel bar S, thereby contacting the reinforcing steel bar S. Then, by further feeding the binding wire W in the reverse direction while moving the guide member 53 from the guiding position of the binding wire W to the retreat position, the binding wire W along the portion of the curling guide 50 is moved toward the direction approaching the steel bar S and contacts the steel bar S, thereby enabling the binding wire W to be reliably wound around the steel bar S.

[0171] Fig.10 1 is a side view of the main part showing another modified example of the strapping machine. A curl forming unit 5C of the strapping machine 1C of another modified example includes a curl guide 50C and an induction guide 51C. The curl forming unit 5C is configured such that at least one of the curl guide 50C and the induction guide 51C can be moved in a direction approaching and moving away from the other to open and close, and when the curl guide 50C and the induction guide 51C are closed, the curl guide 50C and the induction guide 51C are connected.

[0172] The curling guide 50C provides a curling mark to the binding wire W fed by the binding wire feeding unit 30. The guiding guide 51C guides the binding wire W provided with a curling mark by the curling guide 50C to the binding unit 7A.

[0173] In the tying machine 1C, after the tying wire W is wound around the reinforcing bar S along the curling guide 50C and the induction guide 51C, the tying wire W is locked by the tying wire locking body 70, and then the tying wire W is fed in the reverse direction with the guide member 53 protruding to the guide position of the tying wire W.

[0174] Thus, a state is achieved in which, among the binding wires W wound around the reinforcing steel bar S and locked by the binding wire locking body 70, the binding wires W at a location close to the binding wire feeding portion 3A that can move in the circumferential direction of the loop Ru of the feeding path of the binding wires W, that is, the binding wires W at a location along the curling guide 50C are restricted by the guide member 53 from moving in a direction approaching the reinforcing steel bar S. In this state, first, the binding wires W at a location close to the front end side of the binding wires W that are locked by the binding wire locking body 70 and do not move in the circumferential direction of the loop Ru of the feeding path of the binding wires W, that is, the binding wires W at a location along the guide guide 51C that is located on the opposite side of the reinforcing steel bar S from the curling guide 50, are moved in a direction approaching the reinforcing steel bar S and come into contact with the reinforcing steel bar S. Then, by further feeding the binding wire W in the reverse direction while the guide member 53 is moved from the guiding position of the binding wire W to the retreat position, the binding wire W along the portion of the curling guide 50C is moved toward the direction approaching the steel bar S and contacts the steel bar S, thereby enabling the binding wire W to be reliably wound around the steel bar S.

Claims

1. A steel bar bundling machine, comprising: A tying wire feeding section for feeding the tying wire; a curling guide that imparts a curling mark to the tying wire fed in the forward direction by the tying wire feeding portion and includes a first guide member; a binding portion that twists the binding wire fed in a reverse direction by the binding wire feeding portion and wound around the reinforcing steel bar; and an induction guide for guiding the tying wire to which the curling mark is given by the curling guide to the tying portion, The first guide member guides the binding wire which is fed in the forward direction by the binding wire feeding portion and is wound around the reinforcing steel bar after being given a winding mark by the winding guide. The binding portion includes a binding wire locking body, which locks the front end side of the binding wire fed in the positive direction by the binding wire feeding portion and wound around the reinforcing steel bar with a winding mark by the first guide member. The curling guide has a pulling unit, which pulls a second side binding wire portion located on the opposite side of the curling guide relative to the steel bar and along the induction guide toward the steel bar before a first side binding wire portion located on the curling guide, among the binding wires that are wound around the steel bar and have their front ends locked. In the direction along the feeding path of the tying wire, the first side tying wire portion is closer to the tying wire feeding portion than the second side tying wire portion, and the second side tying wire portion is closer to the locking position of the tying wire at the front end of which is locked than the first side tying wire portion. The pulling unit comprises: a second guide member for limiting the movement of the tying wire when the tying wire is pulled back; a first guide member moving mechanism for moving the first guide member between a guide position for guiding the tying wire wound around the reinforcing steel bar and a retreat position retreated from the guide position; and a second guide member moving mechanism having a spring for urging the second guide member in a direction of moving toward the guide position for limiting the movement of the tying wire when the tying wire is pulled back. After the action of feeding the tying wire in the reverse direction by the tying wire feeding unit starts, the first guide member moving mechanism moves the first guide member from the guiding position to the retreat position. The second guide member has an induction portion having a tapered front end in contact with the binding wire and generating a force for moving the second guide member from a guiding position to a retreating position while compressing the spring by contacting the binding wire fed in the reverse direction by the binding wire feeding portion.

2. The steel bar bundling machine according to claim 1, wherein: The pulling unit is configured to be capable of maintaining the first side binding wire in a state of being separated from the reinforcing bar.

3. The steel bar bundling machine according to claim 1, wherein: The guide position is a position radially inside the feeding path of the tying wire wound around the steel bar. The retreat position is a position offset laterally from the feed path.

4. The steel bar bundling machine according to claim 1, wherein: The first guide member is moved from the guide position to the retracted position by the first guide member moving mechanism in conjunction with the operation of the binding portion twisting the binding wire.

5. The steel bar bundling machine according to claim 1, wherein: After the wire feeding unit starts feeding the wire in the reverse direction, the first guide member is moved from the guide position to the retracted position by the first guide member moving mechanism based on the passage of time and / or the feeding amount of the wire and / or the load applied to the wire.

6. The steel bar bundling machine according to claim 1, wherein: After the operation of feeding the binding wire in the reverse direction by the binding wire feeding portion is started, the binding wire is fed in the forward direction by the binding wire feeding portion before the first guide member is moved from the guide position to the retreat position by the first guide member moving mechanism.

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