End Machine

Abstract

To provide a binding machine capable of preventing a wire from loosening a wire wound in reinforcements as a bound object when cutting the wire.SOLUTION: A reinforcement binding machine 1A comprises a cutting portion 6A for cutting a wire W wound in reinforcements S and a binding portion 7A for twisting the wire W wound in the reinforcements S and cut at the cutting portion 6A. The binding portion 7A comprises a first wire holding portion 71c2a and a second wire holding portion 71c2b each provided at a sleeve 71 moving in an axial direction of a rotational axis 72 and rotating with the rotational axis 72, and a coming off prevention portion 70La provided at a first side hook 70L. Since the first wire holding portion 71c2a and the second wire holding portion 71c2b and the coming off prevention portion 70La are moved to the relatively approaching direction, the wire W is held. The wire is cut at the cutting portion 6A after the wire W is held.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This relates to a bundling machine that uses wire to bundle objects such as reinforcing bars. [Background technology]

[0002] Steel bars are used in concrete structures to increase their strength, and are tied together with wire to prevent the bars from shifting from their designated position when the concrete is poured.

[0003] 2. Description of the Related Art Conventionally, there has been proposed a binding machine known as a reinforcing bar binding machine, which wraps a wire around two or more reinforcing bars and twists the wire wrapped around the reinforcing bars to bind the two or more reinforcing bars with the wire.

[0004] When binding reinforcing bars with wire, if the binding is loose, the reinforcing bars will slip apart, so it is necessary to hold the reinforcing bars firmly together.Therefore, a technology has been proposed in which a twisting means for twisting the wire wound around the reinforcing bars is provided so that it can be moved toward or away from the reinforcing bars, and the twisting means is biased by a coil spring in a backward direction away from the reinforcing bars, and the wire is twisted while being tensioned, thereby improving the binding force (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3013880 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in a binding machine that feeds one or more wires and twists the wire, if the excess wire is pulled back to wind the wire around the rebar and then twist the wire wound around the rebar, if the wire wound around the rebar loosens after it is cut and before it is twisted, the wire cannot be made to adhere tightly to the rebar.

[0007] The present invention has been made to solve such problems, and aims to provide a binding machine that can prevent the wire from loosening when the wire wrapped around the reinforcing bar that is being bound is cut. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides: 2 Wire In parallel the wire feeding section feeds the wire in one direction by the wire feeding section, a curl forming section that forms a path for winding the wire fed in one direction around the bundled product, a cutting section that cuts the wire fed in the other direction opposite to the one direction by the wire feeding section and wound around the bundled product, and a bundling section that twists the wire that has been wound around the bundled product and cut by the cutting section, the bundling section having a wire locking body that locks the wire, a rotating shaft that operates the wire locking body, and a first member and a second member that move in directions approaching and receding relatively, and a wire holding section that bends and holds the wire fed in the other direction by the wire feeding section and wound around the bundled product along the axial direction of the rotating shaft as the first member and the second member move closer to each other, and the cutting section is provided on the wire feeding path between the wire feeding section and the wire holding section, and cuts the wire after it is held by the wire holding section. The wire holding portion includes a first wire holding portion that holds one of the two wires and a second wire holding portion that holds the other of the two wires, and the timing at which the first wire holding portion starts holding one of the wires is made different from the timing at which the second wire holding portion starts holding the other wire. It is a binding machine.

[0009] In the present invention, the wire is locked, and the wire wound around the bundle is held by the wire holding section, and then cut by the cutting section, and the wire cut by the cutting section is twisted by the bundling section. Effect of the Invention

[0010] According to the present invention, the wire that has been wound around the bundle and cut is prevented from loosening before being twisted, so that the wire can be tightly attached to the bundle by the action of twisting the wire. [Brief description of the drawings]

[0011] [Figure 1]1 is a side view showing an example of the overall configuration of a reinforcing bar binding machine according to an embodiment of the present invention; FIG. [Figure 2A] FIG. 2 is a side view showing the configuration of the main parts of the reinforcing bar binding machine of the first embodiment. [Figure 2B] 1 is a top view showing a configuration of a main part of a reinforcing bar binding machine according to a first embodiment. FIG. [Figure 2C] 1 is a top cross-sectional view showing a configuration of a main part of a reinforcing bar binding machine according to a first embodiment. FIG. [Figure 3A] FIG. 2 is a side view showing the main configuration of the reinforcing bar binding machine of the present embodiment during operation. [Figure 3B] FIG. 2 is a bottom view showing the main configuration of the reinforcing bar binding machine of the present embodiment during operation. [Figure 3C] FIG. 2 is a bottom view showing the main configuration of the reinforcing bar binding machine of the present embodiment during operation. [Figure 3D] FIG. 2 is a perspective view showing the main configuration of the reinforcing bar binding machine of the present embodiment during operation. [Figure 3E] FIG. 2 is a perspective view showing the main configuration of the reinforcing bar binding machine of the present embodiment during operation. [Figure 4A] FIG. 2 is a side view of a main portion of the reinforcing bar binding machine of the present embodiment. [Figure 4B] FIG. 2 is a side view of a main portion of the reinforcing bar binding machine of the present embodiment. [Figure 4C] FIG. 2 is a perspective view of a main part of the reinforcing bar binding machine according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0013] <Configuration example of the reinforcing bar binding machine according to this embodiment> 1 is a side view showing an example of the overall configuration of a reinforcing bar binding machine according to the present embodiment. The reinforcing bar binding machine 1A is designed to be held by an operator and includes a main body 10A and a handle 11A.

[0014] In addition, the rebar binding machine 1A feeds the wire W in the forward direction indicated by the arrow F, winding it around the rebar S to be bound, and then feeds the wire W wound around the rebar S in the reverse direction indicated by the arrow R, winding it around the rebar S and cutting it, and then twists the wire W to bind the rebar S with the wire W.

[0015] To achieve the above-mentioned functions, the reinforcing bar binding machine 1A is equipped with a magazine 2A that stores the wire W, a wire feeding unit 3A that feeds the wire W, and a wire guide 4A that guides the wire W fed to the wire feeding unit 3A. The reinforcing bar binding machine 1A also is equipped with a curl forming unit 5A that forms a path for winding the wire W fed by the wire feeding unit 3A around the reinforcing bar S, and a cutting unit 6A that cuts the wire W wound around the reinforcing bar S. The reinforcing bar binding machine 1A further includes a binding unit 7A that twists the wire W wound around the reinforcing bar S, and a drive unit 8A that drives the binding unit 7A.

[0016] The magazine 2A is an example of a storage section, and rotatably and detachably stores a reel 20 around which a long wire W is wound so that it can be unwound. The wire W used may be a wire made of a metal wire that can be plastically deformed, a wire made of a metal wire coated with resin, or a twisted wire. The reel 20 has one or more wires W wound around a hub portion (not shown) so that one or more wires W can be pulled out from the reel 20 at the same time.

[0017] The wire feeding unit 3A includes a pair of feed gears 30 that clamp and feed one wire W or multiple wires W arranged in parallel. The wire feeding unit 3A rotates the feed gear 30 by transmitting the rotational operation of a feed motor (not shown). As a result, the wire feeding unit 3A feeds the wire W clamped between the pair of feed gears 30 along the extension direction of the wire W. In a configuration in which multiple wires W, for example two wires W, are fed, the two wires W are fed in a parallel state.

[0018] The wire feed unit 3A switches the rotation direction of the feed gear 30 by switching the rotation direction of the feed motor (not shown) between forward and reverse, and the feed direction of the wire W is switched between one direction, which is a forward direction, and another direction, which is opposite to the one direction, which is a reverse direction.

[0019] The wire guide 4A is provided at a predetermined position upstream of the wire feeding section 3A with respect to the feeding direction in which the wire W is fed in the forward direction. In a configuration in which two wires W are fed, the wire guide 4A regulates the radial orientation of the two wires W, aligns the two entering wires W in parallel, and guides them between a pair of feed gears 30.

[0020] The wire guide 4A has a shape such that the opening on the downstream side with respect to the feeding direction of the wire W fed in the forward direction regulates the radial direction of the wire W. In contrast, the opening on the upstream side with respect to the feeding direction of the wire W fed in the forward direction has a larger opening area than the opening on the downstream side.

[0021] The curl forming unit 5A includes a curl guide 50 that curls the wire W fed by the wire feeding unit 3A, and an induction guide 51 that guides the wire W curled by the curl guide 50 to the bundling unit 7A. In the rebar bundling machine 1A, the path of the wire W fed by the wire feeding unit 3A is regulated by the curl forming unit 5A, so that the trajectory of the wire W becomes a loop Ru as shown by the two-dot chain line in FIG. 1, and the wire W is wound around the rebar S.

[0022] The cutting unit 6A includes a fixed blade unit 60, a movable blade unit 61 that cuts the wire W in cooperation with the fixed blade unit 60, and a transmission mechanism 62 that transmits the operation of the binding unit 7A to the movable blade unit 61. The cutting unit 6A cuts the wire W by the rotational operation of the movable blade unit 61 with the fixed blade unit 60 as a fulcrum axis. In a configuration for cutting a plurality of wires, for example, two wires W, the fixed blade unit 60 and the movable blade unit 61 are configured such that the blade unit for cutting one of the two wires W and the blade unit for cutting the other wire W have an uneven shape along the relative movement direction due to the rotational operation of the movable blade unit 61 with the fixed blade unit 60 as a fulcrum axis, so that cutting of the second wire W starts after cutting of the first wire W starts. This reduces the load at the start of cutting the wire W compared to when cutting of the two wires W starts simultaneously.

[0023] The bundling unit 7A includes a wire locking body 70 that locks the wire W. A detailed configuration of the bundling unit 7A will be described later. The driving unit 8A includes a motor 80 and a reducer 81 that reduces speed and amplifies torque.

[0024] In the reinforcing bar binding machine 1A, the curl guide 50 and the induction guide 51 of the curl forming unit 5A described above are provided at the front end of the main body 10A. The reinforcing bar binding machine 1A also includes a feed regulating unit 90 against which the tip of the wire W abuts in the feed path of the wire W that is guided by the curl forming unit 5A and locked by the wire locking body 70. Furthermore, in the reinforcing bar binding machine 1A, an abutting unit 91 against which the reinforcing bar S abuts is provided between the curl guide 50 and the induction guide 51 at the front end of the main body 10A.

[0025] In the reinforcing bar binding machine 1A, a handle portion 11A extends downward from a main body portion 10A. A battery 15A is detachably attached to the lower portion of the handle portion 11A. Furthermore, in the reinforcing bar binding machine 1A, a magazine 2A is provided in front of the handle portion 11A. In the reinforcing bar binding machine 1A, the above-mentioned wire feeding portion 3A, cutting portion 6A, binding portion 7A, drive portion 8A that drives the binding portion 7A, etc. are stored in the main body portion 10A.

[0026] The rebar binding machine 1A has a trigger 12A provided on the front side of a handle portion 11A, and a switch 13A provided inside the handle portion 11A. In the rebar binding machine 1A, a control unit 14A controls a motor 80 and a feed motor (not shown) according to the state of the switch 13A pressed by operating the trigger 12A.

[0027] Fig. 2A is a side view showing the main configuration of the reinforcing bar binding machine of this embodiment, Fig. 2B is a top view showing the main configuration of the reinforcing bar binding machine of this embodiment, and Fig. 2C is a top cross-sectional view showing the main configuration of the reinforcing bar binding machine of this embodiment. Fig. 3A is a side view showing the main configuration of the reinforcing bar binding machine of this embodiment when it is in operation, Figs. 3B and 3C are bottom views showing the main configuration of the reinforcing bar binding machine of this embodiment when it is in operation, and Figs. 3D and 3E are perspective views showing the main configuration of the reinforcing bar binding machine of this embodiment when it is in operation. Next, with reference to each figure, details of the binding part 7A, the connection structure between the binding part 7A and the driving part 8A, and the configuration for holding the wire W by the binding part 7A before it is cut by the cutting part 6A will be described.

[0028] The bundling unit 7A includes a wire locking body 70 to which the wire W is locked, and a rotating shaft 72 that operates the wire locking body 70. The bundling unit 7A and the drive unit 8A are configured such that the rotating shaft 72 and a motor 80 are connected via a reducer 81, and the rotating shaft 72 is driven by the motor 80 via the reducer 81.

[0029] The wire locking body 70 comprises a center hook 70C connected to a rotating shaft 72, a first side hook 70L and a second side hook 70R that open and close relative to the center hook 70C, and a sleeve 71 that activates the first side hook 70L and the second side hook 70R in conjunction with the rotational movement of the rotating shaft 72.

[0030] In the binding portion 7A, the side where the center hook 70C, the first side hook 70L, and the second side hook 70R are provided is the front side, and the side where the rotating shaft 72 is connected to the reducer 81 is the rear side.

[0031] The center hook 70C, the first side hook 70L, and the second side hook 70R are an example of a locking member. The center hook 70C is also an example of a fixed locking member, the first side hook 70L is an example of a first opening / closing locking member, and the second side hook 70R is an example of a second opening / closing locking member.

[0032] The center hook 70C is connected to one end, that is, the front end, of the rotating shaft 72 via a structure that is rotatable relative to the rotating shaft 72 and is movable integrally with the rotating shaft 72 in the axial direction.

[0033] The first side hook 70L has a tip end, which is one end along the axial direction of the rotating shaft 72, located on one side of the center hook 70C. The first side hook 70L has a rear end, which is the other end along the axial direction of the rotating shaft 72, rotatably supported by the center hook 70C via a shaft 71b.

[0034] The second side hook 70R has a tip end, which is one end along the axial direction of the rotating shaft 72, located on the other side of the center hook 70C. Also, the second side hook 70R has a rear end, which is the other end along the axial direction of the rotating shaft 72, rotatably supported by the center hook 70C via the shaft 71b.

[0035] As a result, the wire locking body 70 rotates about the shaft 71b, opening and closing the tip of the first side hook 70L in the direction of approaching and separating from the center hook 70C, and the tip of the second side hook 70R in the direction of approaching and separating from the center hook 70C.

[0036] The rotating shaft 72 is connected at its rear end, which is the other end, to the reducer 81 via a connecting portion 72b configured to be rotatable integrally with the reducer 81 and movable axially relative to the reducer 81. The connecting portion 72b includes a spring 72c that biases the rotating shaft 72 rearward, which is a direction approaching the reducer 81, and regulates the position of the rotating shaft 72 along the axial direction. As a result, the rotating shaft 72 is configured to be movable forward, which is a direction away from the reducer 81, while receiving a force pushing it backward by the spring 72c. Therefore, when a force is applied to move the wire locking body 70 forward along the axial direction, the rotating shaft 72 is movable forward while receiving a force pushing it backward by the spring 72c.

[0037] The sleeve 71 is an example of a linearly moving rotating member, and has a shape in which a range of a predetermined length along the axial direction of the rotating shaft 72 from the front end indicated by the arrow A1 is divided into two in the radial direction, and the first side hook 70L and the second side hook 70R are inserted openably and closably. The sleeve 71 is cylindrical and covers the circumference of the rotating shaft 72, and has a convex part (not shown) protruding from the inner circumferential surface of the cylindrical space into which the rotating shaft 72 is inserted, and this convex part enters a groove part 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 front-rear direction, which is the direction along the axial direction of the rotating shaft 72, according to the rotation direction of the rotating shaft 72, due to the action of the convex part (not shown) and the feed screw 72a of the rotating shaft 72. The sleeve 71 rotates integrally with the rotating shaft 72.

[0038] The sleeve 71 includes an opening / closing pin 71a that opens and closes the first side hook 70L and the second side hook 70R.

[0039] The opening / closing pin 71a is inserted into an opening / closing guide hole 73 provided in the first side hook 70L and the second side hook 70R. The opening / closing guide hole 73 extends along the movement direction of the sleeve 71 and has a shape that converts the linear movement of the opening / closing pin 71a, which moves in conjunction with the sleeve 71, into an opening / closing operation due to the rotation of the first side hook 70L and the second side hook 70R about the shaft 71b as a fulcrum.

[0040] As the sleeve 71 moves in the rear direction indicated by the arrow A2, the wire locking body 70 moves the first side hook 70L and the second side hook 70R in a rotational motion away from the center hook 70C with the axis 71b as a fulcrum, due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73.

[0041] This causes the first side hook 70L and the second side hook 70R to open relative to the center hook 70C, and a feed path through which the wire W passes is formed between the first side hook 70L and the center hook 70C, and between the second side hook 70R and the center hook 70C.

[0042] When the first side hook 70L and the second side hook 70R are open relative to the center hook 70C, the wire W fed by the wire feeding unit 3A passes between the center hook 70C and the first side hook 70L. The wire W that has passed between the center hook 70C and the first side hook 70L is guided to the curl forming unit 5A. The wire W that has been curled by the curl forming unit 5A and guided to the bundling unit 7A passes between the center hook 70C and the second side hook 70R.

[0043] In the wire locking body 70, as the sleeve 71 moves forward as indicated by the arrow A1, the first side hook 70L and the second side hook 70R move in a direction approaching the center hook 70C by rotating about the shaft 71b due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73. As a result, the first side hook 70L and the second side hook 70R close against the center hook 70C.

[0044] When the first side hook 70L closes relative to the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a manner that allows the wire W to move between the first side hook 70L and the center hook 70C. When the second side hook 70R closes relative to the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a manner that prevents the wire W from slipping out from between the second side hook 70R and the center hook 70C.

[0045] In the wire locking body 70, the second side hook 70R starts to move in a direction approaching the center hook 70C to lock the wire W, and at the same time, the first side hook 70L starts to move in a direction approaching the center hook 70C to lock the wire W. Note that the first side hook 70L may start to move in a direction approaching the center hook 70C between the time when the second side hook 70R starts to move in a direction approaching the center hook 70C and the time when the wire W is locked between the second side hook 70R and the center hook 70C.

[0046] The wire locking body 70 includes a bending portion 71c1 that presses and bends one end, or tip side, of the wire W in a predetermined direction to form the wire W into a predetermined shape. The wire locking body 70 also includes a bending portion 71c2 that holds the wire W before it is cut by the cutting portion 6A, and presses and bends the other end, or terminal side, of the wire W cut by the cutting portion 6A in a predetermined direction to form the wire W into a predetermined shape.

[0047] The forward end of the sleeve 71, indicated by the arrow A1, is divided into two parts, sandwiched between the first side hook 70L, the second side hook 70R, and the center hook 70C, and a bent portion 71c1 is formed at the forward end located on the upper side in the non-rotating area, and a bent portion 71c2 is formed at the forward end located on the lower side.

[0048] As the sleeve 71 moves in the forward / backward direction, which is a direction along the axial direction of the rotation shaft 72 indicated by arrows A1 and A2, the bent portion 71c2 constituting the first member of the wire holding portion and the anti-slip portion 70La which protrudes from the tip of the first side hook 70L in the direction of the second side hook R and constitutes the second member of the wire holding portion move in directions approaching and separating relatively.

[0049] As a result, the sleeve 71 moves forward as indicated by the arrow A1, and the bent portion 71c2 presses the wire W passing between the center hook 70C and the first side hook 70L. The bent portion 71c2 holds the wire W between itself and the fall-out prevention portion 70La of the first side hook 70L.

[0050] The bending portion 71c2 is configured to hold the wire W by pressing the wire W against the slip-out prevention portion 70La of the first side hook 70L and bending it. Therefore, in a configuration in which the two wires W are used to bind the reinforcing bar S, if bending of the two wires W starts at the same time, the load at the start of the bending operation becomes large.

[0051] Therefore, in a configuration in which two wires are used to bind reinforcing bars S, in order to stagger the timing at which bending of the two wires W begins, the bending portion 71c2 is provided with a first wire holding portion 71c2a that begins bending one of the wires W first, and a second wire holding portion 71c2b that begins bending the other wire W after the first wire holding portion 71c2a begins bending one of the wires W.

[0052] The bent portion 71c2 has a first wire holding portion 71c2a and a second wire holding portion 71c2b aligned along the direction in which the two wires W are parallel, and the first wire holding portion 71c2a protrudes forward in the direction indicated by arrow A1 relative to the second wire holding portion 71c2b.

[0053] As a result, the sleeve 71 moves forward as indicated by the arrow A1, so that the first wire holding portion 71c2a first comes into contact with one of the wires W. Then, with a timing delayed according to the distance between the first wire holding portion 71c2a and the second wire holding portion 71c2b, the second wire holding portion 71c2b comes into contact with the other wire W.

[0054] In a region where the sleeve 71 does not rotate, the first wire holding portion 71c2a and the second wire holding portion 71c2b are provided rearward along the axial direction of the rotation shaft 72 indicated by the arrow A2 with respect to the anti-slip portion 70La of the first side hook 70L and downward perpendicular to the axial direction of the rotation shaft 72. As a result, the first wire holding portion 71c2a and the second wire holding portion 71c2b contact the wire W between the anti-slip portion 70La of the first side hook 70L and the cutting portion 6A, i.e., below the anti-slip portion 70La of the first side hook 70L.

[0055] After the wire W is cut at the cutting portion 6A, the sleeve 71 further moves forward as indicated by the arrow A1, thereby pushing the tip side of the wire W, which is engaged with the center hook 70C and the second side hook 70R, with the bending portion 71c1, thereby bending it toward the reinforcing bar S. Furthermore, by moving forward as indicated by the arrow A1, the sleeve 71 pushes the end side of the wire W, which is engaged with the center hook 70C and the first side hook 70L and cut at the cutting portion 6A, with the bending portion 71c2, thereby bending it toward the reinforcing bar S.

[0056] The bundling portion 7A includes a rotation restricting portion 74 that restricts the rotation of the wire locking body 70 and the sleeve 71 in response to the rotational movement of the rotating shaft 72. The rotation restricting portion 74 includes a rotation restricting blade 74a provided on the sleeve 71 and a rotation restricting claw 74b provided on the main body portion 10A.

[0057] The rotation restriction blade 74a is configured by providing a plurality of protrusions that protrude radially from the outer periphery of the sleeve 71 at predetermined intervals in the circumferential direction of the sleeve 71. The rotation restriction blade 74a is fixed to the sleeve 71 and moves and rotates integrally with the sleeve 71.

[0058] In the rotation restricting portion 74, the wire W is locked by the wire locking body 70, and after the wire W is wound around the reinforcing bar S, the wire W is cut by the cutting portion 6A while being held by the bent portion 71c2 of the sleeve 71, and further, in the operation range where the wire W is bent and shaped by the bent portions 71c1 and 71c2 of the sleeve 71, the rotation restricting blade 74a is locked by the rotation restricting claw 74b. When the rotation restricting blade 74a is locked by the rotation restricting claw 74b, the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72 is restricted, and the rotation of the rotating shaft 72 moves the sleeve 71 in the front-rear direction.

[0059] In addition, in the motion range in which the wire W locked by the wire locking body 70 is twisted, the rotation restricting blade 74a is released from the rotation restricting claw 74b. When the rotation restricting blade 74a is released from the rotation restricting claw 74b, the sleeve 71 rotates in conjunction with the rotation of the rotating shaft 72. In the wire locking body 70, the center hook 70C, the first side hook 70L, and the second side hook 70R that have locked the wire W rotate in conjunction with the rotation of the sleeve 71. In the motion range of the sleeve 71 and the wire locking body 70 along the axial direction of the rotating shaft 72, the motion range in which the wire W is locked by the wire locking body 70 is referred to as the first motion range. In addition, the motion range in which the wire W locked by the wire locking body 70 is twisted in the first motion range is referred to as the second motion range.

[0060] The binding portion 7A is provided such that the movable member 83 is movable in conjunction with the sleeve 71. The movable member 83 is attached rotatably relative to the sleeve 71, and moves in the front-rear direction in conjunction with the sleeve 71 but not in conjunction with the rotation of the sleeve 71.

[0061] The moving member 83 has an engaging portion 83a that engages with the transmission mechanism 62. When the moving member 83 moves in the front-rear direction in conjunction with the sleeve 71, the transmission mechanism 62 transmits the movement of the moving member 83 to the movable blade unit 61, causing the movable blade unit 61 to rotate. As a result, the movable blade unit 61 rotates in a predetermined direction as the sleeve 71 moves forward, and the wire W is cut.

[0062] The binding section 7A includes a tension spring 92 that allows binding to be performed while applying tension to the wire W. The tension spring 92 is provided on the outside of the sleeve 71 and biases the sleeve 71 and the wire locking body 70 in a direction away from the abutment section 91 along the axial direction of the rotating shaft 72. The tension spring 92 is, for example, a coil spring that expands and contracts in the axial direction, and is fitted to the outer periphery of the sleeve 71 between the rotation restriction blade 74a and the support frame 76d that supports the sleeve 71 so that it can rotate and slide in the axial direction. When the tension spring 92 is a coil spring, the inner diameter is configured to be larger than the outer diameter of the sleeve 71. Note that the tension spring 92 is not limited to a coil spring that expands and contracts in the axial direction, and may be a leaf spring, a torsion coil spring, one or more disc springs, etc. that bias the sleeve 71 along the axial direction of the rotating shaft 72.

[0063] The tensioning spring 92 is compressed between the support frame 76d and the rotation restricting blade 74a depending on the position of the sleeve 71 along the axial direction of the rotating shaft 72, and urges the sleeve 71 backward, that is, in a direction away from the abutting portion 91 along the axial direction of the rotating shaft 72. As a result, the tensioning spring 92 urges the wire locking body 70 equipped with the sleeve 71 in a direction that maintains the tension applied to the wire W by feeding the wire W in the reverse direction and winding it around the reinforcing bar S.

[0064] As a result, when the sleeve 71 moves forward and is compressed, the tensioning spring 92 applies a tension to the wire W that is wound around the reinforcing bar S and then cut at the cutting portion 6A with a force greater than the force acting in the direction in which the wire W wound around the reinforcing bar S loosens. This makes it possible to perform bundling while applying tension to the wire W after it is cut.

[0065] Further, the wire locking body 70 is configured to be movable forward while the sleeve 71 receives a force pushing it backward by the tensioning spring 92 and while the rotating shaft 72 receives a force pushing it backward by the spring 72c.

[0066] <Example of operation of the reinforcing bar binding machine according to the present embodiment> 4A and 4B are side views of the main parts of the reinforcing bar binding machine of this embodiment, and FIG. 4C is a perspective view of the main parts of the reinforcing bar binding machine of this embodiment, showing the operation of holding and cutting the wire.

[0067] Next, an operation of binding a reinforcing bar S with a wire W by the reinforcing bar binding machine 1A of this embodiment will be described with reference to each drawing.

[0068] The reinforcing bar binding machine 1A is in a standby state in which the wire W is clamped between a pair of feed gears 30, and the tip of the wire W is located between the clamping position of the feed gears 30 and the fixed blade portion 60 of the cutting section 6A. In addition, in the standby state of the reinforcing bar binding machine 1A, the wire locking body 70 moves in the rear direction indicated by the arrow A2, and as shown in FIG. 2B etc., the first side hook 70L is open relative to the center hook 70C, and the second side hook 70R is open relative to the center hook 70C. Furthermore, in the standby state of the reinforcing bar binding machine 1A, the rotation restriction blade 74a is separated from the tensioning spring 92, and the sleeve 71 and the wire locking body 70 are not biased rearward by the tensioning spring 92.

[0069] When the reinforcing bar S is placed between the curl guide 50 and the induction guide 51 of the curl forming section 5A and the trigger 12A is operated, the feed motor (not shown) is driven in the forward rotation direction, and the wire W is fed in the forward direction indicated by the arrow F in the wire feed section 3A.

[0070] In the case of a configuration in which reinforcing bars S are bound using multiple wires, for example two wires W, the two wires W are fed in parallel along the axial direction of the loop Ru formed by the wires W by the wire guide 4A.

[0071] The wire W fed in the forward direction passes between the center hook 70C and the first side hook 70L, and is fed to the curl guide 50 of the curl forming unit 5A. By passing through the curl guide 50, the wire W is given a curl that wraps around the reinforcing bar S.

[0072] The wire W having been curled by the curl guide 50 is guided by the induction guide 51 and further fed in the forward direction by the wire feed unit 3A, so that the wire W is guided by the induction guide 51 to between the center hook 70C and the second side hook 70R. The wire W is then fed until its tip abuts against the feed restriction unit 90. When the wire W is fed to a position where its tip abuts against the feed restriction unit 90, the drive of the feed motor (not shown) is stopped.

[0073] After the forward feed of the wire W is stopped, the motor 80 is driven in the forward rotation direction. In the first operating range in which the wire locking body 70 locks the wire W, the rotation restricting blade 74a is locked by the rotation restricting claw 74b, thereby restricting 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 forward direction, that is, in the direction of the arrow A1.

[0074] When the sleeve 71 moves forward, the opening / closing pin 71a passes through the opening / closing guide hole 73. As a result, the first side hook 70L moves toward the center hook 70C by rotating about the shaft 71b. When the first side hook 70L closes against the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a manner that allows it to move between the first side hook 70L and the center hook 70C.

[0075] Also, the second side hook 70R moves in a direction approaching the center hook 70C by rotating about the shaft 71b. When the second side hook 70R closes against the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a manner that does not allow it to slip out from between the second side hook 70R and the center hook 70C. In the first operating range in which the wire locking body 70 locks the wire W, the sleeve 71 and the wire locking body 70 are not biased backward by the tensioning spring 92, and the sleeve 71 and the wire locking body 70 move forward in the direction of the arrow A1, so no load is applied by the tensioning spring 92.

[0076] After the sleeve 71 is advanced to a position where the first side hook 70L and the second side hook 70R close to engage the wire W, the rotation of the motor 80 is temporarily stopped and the feed motor (not shown) is driven in the reverse direction.

[0077] As a result, the pair of feed gears 30 rotate in the reverse direction, and the wire W held between the pair of feed gears 30 is fed in the reverse direction indicated by the arrow R. Since the tip end of the wire W is secured between the second side hook 70R and the center hook 70C in a manner that prevents it from slipping out, the wire W is wound around the reinforcing bar S by the operation of feeding the wire W in the reverse direction.

[0078] After winding the wire W around the reinforcing bar S and stopping the reverse rotation of the feed motor (not shown), the motor 80 is driven in the forward rotation direction to move the sleeve 71 further forward as indicated by the arrow A1.

[0079] In the case of a configuration in which the reinforcing bar S is bound by two wires W, the sleeve 71 moves forward as indicated by the arrow A1, so that the first wire holding portion 71c2a first contacts one wire W1 of the two wires W passing between the center hook 70C and the first side hook 70L. When the sleeve 71 moves further forward, the first wire holding portion 71c2a presses the one wire W1 against the slip-out prevention portion 70La of the first side hook 70L, and as shown in FIG. 4A, the one wire W1 is bent forward along the axial direction of the rotation shaft 72 as indicated by the arrow A1 between the slip-out prevention portion 70La and the cutting portion 6A so as to follow the slip-out prevention portion 70La.

[0080] As a result, one wire W1 is held between the first wire holding portion 71c2a and the anti-slip portion 70La in a form in which it is clamped from the front-to-back direction, which is one direction along the axial direction of the rotating shaft 72 indicated by arrows A1 and A2, and from the up-down direction, which is the other direction perpendicular to the axial direction of the rotating shaft 72.

[0081] 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 movable blade unit 61 rotates, due to the shapes of the fixed blade unit 60 and the movable blade unit 61, cutting of one wire W1 held between the first wire holding unit 71c2a and the pull-out prevention unit 70La begins at a timing prior to cutting of the other wire W2.

[0082] As the sleeve 71 moves forward, the first wire holding portion 71c2a starts bending one wire W1, and the second wire holding portion 71c2b comes into contact with the other wire W2 at approximately the same time as the cutting of the one wire W1 is completed. As the sleeve 71 moves further forward, the second wire holding portion 71c2b presses the other wire W2 against the slip-out prevention portion 70La of the first side hook 70L, and as shown in FIG. 4B, the other wire W2 is bent forward along the axial direction of the rotation shaft 72, indicated by the arrow A1, between the slip-out prevention portion 70La and the cutting portion 6A so as to follow the slip-out prevention portion 70La.

[0083] As a result, the other wire W2 is held between the second wire holding portion 71c2b and the slip-out prevention portion 70La in a form in which it is clamped from the front-rear direction, which is one direction along the axial direction of the rotation shaft 72 indicated by arrows A1 and A2, and from the up-down direction, which is the other direction perpendicular to the axial direction of the rotation shaft 72. In addition, cutting of one wire W1 is started at the cutting portion 6A by the time the second wire holding portion 71c2b starts holding the other wire W2.

[0084] The other wire W2 is held between the second wire holding portion 71c2b and the anti-slip portion 70La, and when the sleeve 71 moves further forward, the other wire W2 held between the second wire holding portion 71c2b and the anti-slip portion 70La is cut by the action of the fixed blade portion 60 and the movable blade portion 61.

[0085] As described above, after the wire W is wound around the reinforcing bar S, one wire W1 of the two wires W before cutting that pass between the center hook 70C and the first side hook 70L is held between the first wire holding portion 71c2a constituting the bent portion 71c2 of the sleeve 71 and the pull-out prevention portion 70La of the first side hook 70L, thereby preventing the wire W1 before cutting wound around the reinforcing bar S from loosening. In addition, the other wire W2 is held between the second wire holding portion 71c2b constituting the bent portion 71c2 of the sleeve 71 and the pull-out prevention portion 70La of the first side hook 70L, thereby preventing the wire W2 before cutting wound around the reinforcing bar S from loosening.

[0086] In a configuration in which the wire W is cut between the portion passing between the center hook 70C and the first side hook 70L and the portion clamped by a pair of feed gears 30, when the wire W is cut at that position, the tension applied to the wire W by being clamped by the pair of feed gears 30 is released, and the wire W wound around the reinforcing bar S loosens before it is twisted.

[0087] In contrast, in the present embodiment, after the wire W is wound around the reinforcing bar S, the wire W before cutting that passes between the center hook 70C and the first side hook 70L is held between the first wire holding portion 71c2a and the second wire holding portion 71c2b that constitute the bent portion 71c2 of the sleeve 71 and the slip-out prevention portion 70La of the first side hook 70L. This prevents the wire W wound around the reinforcing bar S from loosening before twisting. In addition, by shifting the timing of holding and cutting one wire W1 and holding and cutting the other wire W2, the load at the start of holding the wire W is reduced compared to when holding two wires W is started simultaneously, and the load at the start of cutting the wire W is reduced compared to when cutting two wires W is started simultaneously.

[0088] Furthermore, when the wire W is cut, the tension applied to the wire W is released, and the sleeve 71 tries to move forward. When the sleeve 71 moves forward, the force pulling the wire W locked by the wire locking body 70 backward decreases, and the wire W wound around the reinforcing bar S loosens before it is twisted.

[0089] In contrast, in the present embodiment, the rebar tying machine 1A moves the sleeve 71 and the wire locking body 70 forward, and in the operating range in which the wire W is cut, the rotation limiting blade 74a contacts the tensioning spring 92, and the tensioning spring 92 is compressed between the support frame 76d and the rotation limiting blade 74a, so that the sleeve 71 and the wire locking body 70 are urged backward by the tensioning spring 92.

[0090] This prevents the sleeve 71 from moving forward, thereby preventing a decrease in the force pulling the wire W locked by the wire locking body 70 backward, and prevents the wire W wound around the reinforcing bar S from loosening before it is twisted.

[0091] In addition, when the sleeve 71 and the wire locking body 70 are urged rearward by the tensioning spring 92 throughout the entire first operating range in which the wire W is locked by the wire locking body 70, the load on the motor 80 increases.

[0092] Therefore, as described above, in the standby state of the rebar binding machine 1A, the rotation restriction blade 74a is separated from the tensioning spring 92, and in the initial range of motion in which the first side hook 70L and the second side hook 70R are closed in the first range of motion in which the wire locking body 70 locks the wire W, the sleeve 71 and the wire locking body 70 are not biased backward by the tensioning spring 92. As a result, in the initial range of motion in which the wire locking body 70 locks the wire W, the sleeve 71 and the wire locking body 70 move forward in the direction of the arrow A1, and no load is applied due to the load of the tensioning spring 92 biasing the sleeve 71 and the wire locking body 70 backward. Therefore, an increase in the load applied to the motor 80 in the range in which the load of the tensioning spring 92 is not required can be suppressed.

[0093] On the other hand, the rotating shaft 72 is connected to the reducer 81 via a connecting part 72b having a configuration that allows the rotating shaft 72 to rotate integrally with the reducer 81 and to move in the axial direction relative to the reducer 81. In the initial range of the first range of operation in which the wire W is locked by the wire locking body 70 from the standby position, the sleeve 71 and the wire locking body 70 are not biased backward by the tensioning spring 92, so that the axial position of the rotating shaft 72 cannot be restricted by the tensioning spring 92 in the initial range of operation in the first range of operation. Therefore, the connecting part 72b is provided with a spring 72c that biases the rotating shaft 72 backward, which is a direction approaching the reducer 81. As a result, the rotating shaft 72 is biased backward by the spring 72c, and its position is restricted unless a force that moves the rotating shaft 72 forward is applied in excess of the biasing force of the spring 72c.

[0094] Therefore, by suppressing an increase in the load on the motor 80 in an area where the load due to the bias of the tensioning spring 92 is not required, it is possible to suppress an increase in the load on the motor 80 etc. throughout one bundling cycle, and to suppress a decrease in the durability of the parts. Furthermore, by providing the spring 72c, it is possible to suppress inadvertent movement of the rotating shaft 72 in an area where the biasing force of the tensioning spring 92 is not applied.

[0095] By driving the motor 80 in the forward rotation direction, the sleeve 71 moves forward as indicated by the arrow A1 to cut the wire W, and at the same time, the bent portion 71c1 moves in a direction approaching the rebar S. As a result, the tip side of the wire W engaged with the center hook 70C and the second side hook 70R is pressed toward the rebar S by the bent portion 71c1, and is bent toward the rebar S with the engaged position as a fulcrum. As the sleeve 71 moves further forward, the wire W engaged between the second side hook 70R and the center hook 70C is held in a state where it is sandwiched by the bent portion 71c1.

[0096] Furthermore, the end of the wire W that is held between the first wire holding portion 71c2a and the second wire holding portion 71c2b constituting the bending portion 71c2 of the sleeve 71 and the slip-out prevention portion 70La of the first side hook 70L and that has been cut at the cutting portion 6A is further pressed toward the reinforcing bar S by the bending portion 71c2, and is bent toward the reinforcing bar S with the locking position as a fulcrum. As the sleeve 71 moves further forward, the wire W that is locked between the first side hook 70L and the center hook is held in a state where it is sandwiched by the bending portion 71c2.

[0097] After the tip and end of the wire W are bent toward the rebar S, the motor 80 is further driven in the forward rotation direction, so that the sleeve 71 moves further forward. When the sleeve 71 moves to a predetermined position and reaches an operating range for twisting the wire W locked by the wire locking body 70, the locking of the rotation restricting blade 74a with the rotation restricting claw 74b is released.

[0098] As a result, the motor 80 is further driven in the forward rotation direction, whereby the sleeve 71 rotates in conjunction with the rotary shaft 72, and the wire W held by the wire holding body 70 is twisted.

[0099] In the second operating range of the binding portion 7A, the wire W locked by the wire locking body 70 is twisted, and a force is applied to the wire locking body 70 that pulls the wire locking body 70 forward along the axial direction of the rotation shaft 72. Meanwhile, as the sleeve 71 moves forward to a position where it can rotate, the tensioning spring 92 is further compressed, and the sleeve 71 is subjected to a force that pushes it backward by the tensioning spring 92.

[0100] As a result, when a force is applied to the wire locking body 70 to move it forward in the axial direction, the sleeve 71 is pushed backward by the tensioning spring 92, and the rotating shaft 72 is pushed backward by the spring 72c, moving forward, twisting the wire W as it moves forward.

[0101] As a result, the portion of the wire W locked by the wire locking body 70 is pulled backward, tension is applied in the tangential direction of the reinforcing bar S, and the wire W is pulled so as to come into close contact with the reinforcing bar S. In the second operating range in which the sleeve 71 rotates to twist the wire W, the wire locking body 70 further rotates in conjunction with the rotating shaft 72, and the wire W is further twisted as the wire locking body 70 and the rotating shaft 72 move forward in a direction in which the gap between the twisted portion of the wire W and the reinforcing bar S becomes smaller.

[0102] Therefore, the wire W is twisted while moving forward with the wire locking body 70 and the rotating shaft 72 receiving the force pushing backward by the tensioning spring 92 and the spring 72c, so that the gap between the twisted part of the wire W and the reinforcing bar S becomes smaller, and the wire W adheres closely to the reinforcing bar S in a manner that follows the reinforcing bar S. This removes the slack in the wire W before twisting, and the wire W can be tied in a state where it is in close contact with the reinforcing bar S.

[0103] When it is detected that the load on the motor 80 has reached a maximum by twisting the wire W, the forward rotation of the motor 80 is stopped. Next, the motor 80 is driven in the reverse rotation direction, causing the rotating shaft 72 to rotate reversely, and when the sleeve 71 rotates reversely following the reverse rotation of the rotating shaft 72, the rotation restricting blade 74a is engaged with the rotation restricting claw 74b, thereby restricting the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72. As a result, the sleeve 71 moves backward, in the direction of arrow A2.

[0104] When the sleeve 71 moves rearward, the bent portions 71c1 and 71c2 move away from the wire W, and the holding of the wire W by the bent portions 71c1 and 71c2 is released. Furthermore, when the sleeve 71 moves rearward, the opening / closing pin 71a passes through the opening / closing guide hole 73. As a result, the first side hook 70L moves in a direction away from the center hook 70C by rotating about the shaft 71b. Furthermore, the second side hook 70R moves in a direction away from the center hook 70C by rotating about the shaft 71b. As a result, the wire W comes out of the wire locking body 70. [Explanation of symbols]

[0105] 1A rebar tying machine, 10A main body, 2A magazine, 20 reel, 3A wire feed section, 30 feed gear, 5A curl forming section, 50 curl guide, 51 induction guide, 6A cutting section, 60 fixed blade section, 61 movable blade section, 62 transmission mechanism, 7A bundling section, 70 wire retaining body, 70L first side hook, 70La... Anti-slip portion (wire holding portion, second member), 70R... Second side hook, 70C... Center hook, 71... Sleeve, 71c1... Bending portion, 71c2... Bending portion (wire holding portion, first member), 71c2a... First wire holding portion, 71c2b... Second wire holding portion, 72... Rotating shaft, 8A... Driving portion, 80... Motor, W... Wire

Claims

1. A wire feeding section that feeds two wires in parallel; a curl forming section that forms a path for winding the wire fed in one direction by the wire feeding section around a bundle; a cutting unit that cuts the wire that is fed in a direction opposite to the one direction by the wire feeding unit and wound around the bundle; a bundling part that is wound around the bundling object and twists the wire cut by the cutting part, The binding portion is a wire locking body to which the wire is locked; A rotating shaft that operates the wire locking body; The wire feeder includes a wire holding section that has a first member and a second member that move in a direction approaching and a direction separating relative to each other, and that bends and holds the wire that has been fed in another direction by the wire feed section and wound around a bundle along the axial direction of the rotation shaft as the first member and the second member move relatively closer to each other, The cutting unit is provided on a wire feed path between the wire feed unit and the wire holding unit, and cuts the wire after the wire is held by the wire holding unit, the wire holding portion includes a first wire holding portion that holds one of the two wires and a second wire holding portion that holds the other of the two wires; The timing at which the first wire holding portion starts holding one of the wires is made to differ from the timing at which the second wire holding portion starts holding the other wire. Binding machine.

2. The wire holding portion holds the wire between the first member and the second member from one direction along the axial direction of the rotation shaft. The strapping machine according to claim 1.

3. The wire holding portion holds the wire between the first member and the second member from another direction perpendicular to the axial direction of the rotation shaft. The strapping machine according to claim 2.

4. The wire locking body is a linear motion rotation member that moves in the axial direction of the rotation shaft and rotates together with the rotation shaft; At least one pair of locking members that move relatively toward and away from each other when the linearly acting rotation member moves in the axial direction of the rotation shaft, The wire holding portion has the first member provided on the locking member and the second member provided on the linearly acting rotation member. The binding machine according to any one of claims 1 to 3.

5. The wire locking body is A fixed locking member; a first open / close locking member that moves toward and away from the fixed locking member; a second opening / closing locking member that moves toward and away from the fixed locking member, a wire fed by the wire feeding unit passes between the first open / close locking member and the fixed locking member, and a wire curled by the curl forming unit passes between the second open / close locking member and the fixed locking member, The first opening / closing locking member starts to move in a direction approaching the fixed locking member at the same time as the second opening / closing locking member starts to move in a direction approaching the fixed locking member, or during the period from when the second opening / closing locking member starts to move in a direction approaching the fixed locking member to when the wire is locked between the second opening / closing locking member and the fixed locking member. The binding machine according to any one of claims 1 to 3.

6. The cutting unit causes a timing for starting cutting one wire to differ from a timing for starting cutting the other wire. The binding machine according to any one of claims 1 to 5.

7. The wire holding portion is configured such that the first wire holding portion starts holding one wire before the second wire holding portion starts holding the other wire, the cutting unit starts cutting one of the wires at a timing earlier than the timing of starting cutting the other wire; Furthermore, the cutting section starts cutting one of the wires by the time the second wire holding section starts holding the other wire. The binding machine according to any one of claims 1 to 6.

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