Binding machine

Abstract

To provide a binding machine that can suppress wires from loosening when wires wrapped around to-be-bound re-bars are cut.SOLUTION: A rebar binding machine 1A includes a cutting part 6A that cuts wires W wound around rebar S, and a binding part 7A that twists the wires W that are wound around re-bars S and cut by the cutting unit 6A; the binding part 7A includes a first wire holding part 71c2a and a second wire holding pare 71c2b that are provided on a sleeve 71 which moves in the shaft direction of a rotating shaft 72 and rotates together with the rotating shaft 72, and a slip-out prevention part 70La that is provided on a first side hook 70L; the first wire holding part 71c2a and the second wire holding part 71c2b, and the slip-out prevention portion 70La move in a direction relatively approaching each other along the shaft direction of the rotating shaft 72, thereby bending and holding the wires W, and the wires are cut by the cutting part 6A after being held.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a tying machine for tying bundles of reinforcing bars or the like with a wire.

Background Art

[0002] Reinforcing bars are used in concrete structures to improve their strength, and are tied with a wire so that the reinforcing bars do not shift from their predetermined positions during concrete placement.

[0003] Conventionally, a tying machine called a reinforcing bar tying machine has been proposed, in which a wire is wound around two or more reinforcing bars, and the wire wound around the reinforcing bars is twisted to tie the two or more reinforcing bars with the wire.

[0004] When tying reinforcing bars with a wire, if the tie is loose, the reinforcing bars will shift from each other, so it is required to firmly hold the reinforcing bars together. Therefore, a twisting means for twisting the wire wound around the reinforcing bars is provided so as to be able to approach or separate from the reinforcing bars, and the twisting means is biased in the rearward direction, which is the direction away from the reinforcing bars, by a coil spring, and a technique for improving the tying force by twisting while applying tension to the wire has been proposed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in a tying machine that feeds one or a plurality of wires and twists the wire, in a configuration where the excess wire is pulled back to wind the wire around the reinforcing bar and then twist the wire wound around the reinforcing bar, after cutting the wire, if the wire wound around the reinforcing bar loosens before twisting the wire, the wire cannot be brought into close contact with the reinforcing bar.

[0007] The present invention has been made to solve such problems, and an object thereof is to provide a bundling machine capable of suppressing loosening of a wire when the wire wound around a reinforcing bar as a bundling object is cut.

Means for Solving the Problems

[0008] To solve the above-described problems, the present invention includes a wire feeding unit that feeds a wire, a curl forming unit that forms a path for winding the wire fed in one direction by the wire feeding unit around a bundling object, a cutting unit that cuts the wire fed in the other direction opposite to the one direction by the wire feeding unit and wound around the bundling object, and a bundling unit that twists the wire wound around the bundling object and cut by the cutting unit. The bundling unit includes a wire locking body on which the wire is locked, a rotating shaft that operates the wire locking body, and a first member and a second member that move in directions approaching and separating along the axial direction of the rotating shaft relatively. The bundling unit further includes a wire holding unit that holds the wire wound around the bundling object and fed in the other direction by the wire feeding unit by an operation in which the first member and the second member approach relatively. The wire holding unit bends and holds a part of the wire before cutting, which is opposite to the tip of the wire wound around the bundling object, along the axial direction of the rotating shaft. The cutting unit is provided in the wire feeding path between the wire feeding unit and the wire holding unit, and is a bundling machine that cuts the wire after the wire is held by the wire holding unit.

[0009] In the present invention, after the wire is locked and the wire wound around the bundling object is held by the wire holding unit, it is cut by the cutting unit, and the wire cut by the cutting unit is twisted by the bundling unit.

Effects of the Invention

[0010] According to the present invention, loosening of the wire before cutting, which is wound around the bundling object, is suppressed. Thereby, the wire can be brought into close contact with the bundling object by the operation of twisting the wire.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2A

Figure 2B

Figure 2C

Figure 3A

Figure 3B

Figure 3C

Figure 3D

Figure 3E

Figure 4A

Figure 4B

Figure 4C

Embodiments for Carrying Out the Invention

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

[0013] <Configuration Example of the Steel Bar Tying Machine According to the Present Embodiment> FIG. 1 is an internal configuration diagram viewed from the side showing an example of the overall configuration of the steel bar tying machine according to the present embodiment. The steel bar tying machine 1A is in a form that can be held and used by an operator, and includes a main body portion 10A and a handle portion 11A.

[0014] Also, the steel bar bundling machine 1A feeds the wire W in the positive direction indicated by the arrow F, winds it around the steel bar S which is the object to be bundled, sends the wire W wound around the steel bar S in the reverse direction indicated by the arrow R, winds and cuts it around the steel bar S, then twists the wire W and bundles the steel bar S with the wire W.

[0015] To realize the above-described functions, the steel bar bundling machine 1A includes a magazine 2A that houses the wire W, a wire feeding section 3A that feeds the wire W, and a wire guide 4A that guides the wire W sent to the wire feeding section 3A. Also, the steel bar bundling machine 1A includes a curl forming section 5A that forms a path for winding the wire W sent by the wire feeding section 3A around the steel bar S, and a cutting section 6A that cuts the wire W wound around the steel bar S. Further, the steel bar bundling machine 1A includes a bundling section 7A that twists the wire W wound around the steel bar S, and a driving section 8A that drives the bundling section 7A.

[0016] The magazine 2A is an example of a housing section, and a reel 20 around which a long wire W is wound so as to be payed out rotatably and detachably stored. The wire W is a wire made of a metal wire capable of plastic deformation, a wire in which the metal wire is coated with resin, or a stranded wire. The reel 20 has one or a plurality of wires W wound around a hub portion (not shown), and one or a plurality of wires W can be drawn out from the reel 20 simultaneously.

[0017] The wire feeding section 3A includes a pair of feeding gears 30 that sandwich and feed one or a plurality of parallel wires W. The wire feeding section 3A has the rotational operation of a feeding motor (not shown) transmitted thereto and the feeding gears 30 rotate. Thereby, the wire feeding section 3A feeds the wire W sandwiched between the pair of feeding gears 30 along the extending direction of the wire W. In a configuration where a plurality of wires W, for example, two wires W are fed, the two wires W are fed in a parallel state.

[0018] The wire feeding section 3A switches the forward and reverse of the rotational direction of the feeding motor (not shown), thereby switching the rotational direction of the feeding gears 30, and the feeding direction of the wire W is switched between the positive direction which is one direction and the reverse direction which is the other direction opposite to the one direction.

[0019] The wire guide 4A is provided at a predetermined position on the upstream side of the wire feeding section 3A with respect to the feeding direction for feeding the wire W in the forward direction. In the configuration for feeding two wires W, the wire guide 4A regulates the radial directions of the two wires W, aligns the two incoming wires W in parallel, and guides them between a pair of feeding 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 section 5A includes a curl guide 50 that imparts a curl to the wire W fed by the wire feeding section 3A, and a guiding guide 51 that guides the wire W with the curl imparted by the curl guide 50 to the bundling section 7A. In the steel bar bundling machine 1A, the path of the wire W fed by the wire feeding section 3A is regulated by the curl forming section 5A, so that the locus 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 steel bar S.

[0022] The cutting section 6A includes a fixed blade section 60, a movable blade section 61 that cuts the wire W in cooperation with the fixed blade section 60, and a transmission mechanism 62 that transmits the operation of the bundling section 7A to the movable blade section 61. The cutting section 6A cuts the wire W by the rotational movement of the movable blade section 61 with the fixed blade section 60 as the fulcrum axis. In the configuration for cutting a plurality of wires W, for example, two wires W, after starting the cutting of the first wire W, the fixed blade section 60 and the movable blade section 61 are arranged such that the cutting of the second wire W is started. The blade sections for cutting one of the two wires W and the other wire W are configured to have irregularities along the relative movement direction by the rotational movement of the movable blade section 61 with the fixed blade section 60 as the fulcrum axis. Thereby, the load at the start of cutting the wire W is reduced compared to the case where the cutting of the two wires W is started simultaneously.

[0023] The end portion 7A includes a wire locking body 70 to which the wire W is locked. The detailed configuration of the end portion 7A will be described later. The drive portion 8A includes a motor 80 and a speed reducer 81 that performs speed reduction and torque amplification.

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

[0025] In the steel bar tying machine 1A, the handle portion 11A extends downward from the main body portion 10A. Further, a battery 15A is detachably attached to the lower portion of the handle portion 11A. Furthermore, a magazine 2A is provided in front of the handle portion 11A. In the steel bar tying machine 1A, the above-described wire feed portion 3A, cutting portion 6A, end portion 7A, drive portion 8A for driving the end portion 7A, etc. are housed in the main body portion 10A.

[0026] In the steel bar tying machine 1A, a trigger 12A is provided on the front side of the handle portion 11A, and a switch 13A is provided inside the handle portion 11A. The steel bar tying machine 1A controls the motor 80 and a feed motor (not shown) by the control portion 14A according to the state of the switch 13A pushed by the operation of the trigger 12A.

[0027] FIG. 2A is a side view showing the main configuration of the steel bar tying machine according to the present embodiment, FIG. 2B is a top view showing the main configuration of the steel bar tying machine according to the present embodiment, and FIG. 2C is a top cross-sectional view showing the main configuration of the steel bar tying machine according to the present embodiment. Further, FIG. 3A is a side view showing the main configuration during the operation of the steel bar tying machine according to the present embodiment, FIGS. 3B and 3C are bottom views showing the main configuration during the operation of the steel bar tying machine according to the present embodiment, and FIGS. 3D and 3E are perspective views showing the main configuration during the operation of the steel bar tying machine according to the present embodiment. Next, with reference to each figure, the details of the tying portion 7A, the connection structure between the tying portion 7A and the driving portion 8A, and the configuration for holding the wire W by the tying portion 7A before being cut by the cutting portion 6A will be described.

[0028] The tying portion 7A includes a wire locking body 70 to which the wire W is locked and a rotating shaft 72 for operating the wire locking body 70. The tying portion 7A and the driving portion 8A are connected such that the rotating shaft 72 and the motor 80 are connected via a speed reducer 81, and the rotating shaft 72 is driven by the motor 80 via the speed reducer 81.

[0029] The wire locking body 70 includes a center hook 70C connected to the rotating shaft 72, a first side hook 70L and a second side hook 70R that open and close with respect to the center hook 70C, and a sleeve 71 that operates 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 tying 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 speed reducer 81 is the rear side.

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

[0032] The center hook 70C is connected to the front end, which is one end of the rotating shaft 72, through a configuration that is rotatable with respect to the rotating shaft 72 and axially movable integrally with the rotating shaft 72.

[0033] One end of the first side hook 70L in the axial direction of the rotating shaft 72, i.e., the tip side, is located on one side with respect to the center hook 70C. Also, the other end of the first side hook 70L in the axial direction of the rotating shaft 72, i.e., the rear end side, is rotatably supported by the center hook 70C with the shaft 71b.

[0034] One end of the second side hook 70R in the axial direction of the rotating shaft 72, i.e., the tip side, is located on the other side with respect to the center hook 70C. Also, the other end of the second side hook 70R in the axial direction of the rotating shaft 72, i.e., the rear end side, is rotatably supported by the center hook 70C with the shaft 71b.

[0035] As a result, the wire locking body 70 opens and closes in a direction where the tip side of the first side hook 70L separates from and contacts the center hook 70C by a rotational operation with the shaft 71b as a fulcrum. Also, the tip side of the second side hook 70R opens and closes in a direction where it separates from and contacts the center hook 70C.

[0036] The rotating shaft 72 is integrally rotatable with the speed reducer 81 and has a connecting portion 72b configured to be axially movable with respect to the speed reducer 81. The rear end, which is the other end, is connected to the speed reducer 81 through the connecting portion 72b. The connecting portion 72b includes a spring 72c that biases the rotating shaft 72 in the rearward direction, which is the direction approaching the speed reducer 81, and restricts the position of the rotating shaft 72 along the axial direction. As a result, the rotating shaft 72 is configured to be movable forward in the direction away from the speed reducer 81 while receiving the force pushed rearward 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 can move forward while receiving the force pushed rearward by the spring 72c.

[0037] The sleeve 71 is an example of a linear motion and rotating member. From the front end in the forward direction indicated by the arrow A1, a range of a predetermined length along the axial direction of the rotating shaft 72 has a shape that is radially divided into two parts, and is shaped such that the first side hook 70L and the second side hook 70R can be opened and closed. Further, the sleeve 71 is cylindrical and covers the periphery of the rotating shaft 72, and has a convex portion (not shown) protruding from the inner peripheral surface of the cylindrical space into which the rotating shaft 72 is inserted, and this convex portion fits into the groove portion of the 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 portion (not shown) and the feed screw 72a of the rotating shaft 72. Further, the sleeve 71 rotates integrally with the rotating shaft 72.

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

[0039] The opening and closing pin 71a is inserted into the opening and closing guide holes 73 provided in the first side hook 70L and the second side hook 70R. The opening and closing guide holes 73 extend along the moving direction of the sleeve 71, and have a shape that converts the linear movement of the opening and closing pin 71a that moves in conjunction with the sleeve 71 into an opening and closing operation by the rotation of the first side hook 70L and the second side hook 70R with the shaft 71b as a fulcrum.

[0040] When the sleeve 71 moves in the rear direction indicated by the arrow A2, the first side hook 70L and the second side hook 70R move in a direction away from the center hook 70C by a rotational operation with the shaft 71b as a fulcrum, due to the locus of the opening and closing pin 71a and the shape of the opening and closing guide holes 73.

[0041] As a result, the first side hook 70L and the second side hook 70R open with respect 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 with respect to the center hook 70C, the wire W sent by the wire feeding unit 3A passes between the center hook 70C and the first side hook 70L. The wire W passing between the center hook 70C and the first side hook 70L is guided to the curl forming unit 5A. Then, the wire W that is 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] When the sleeve 71 of the wire locking body 70 moves in the forward direction 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 a rotational movement with the shaft 71b as a fulcrum due to the locus 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 70L and the second side hook 70R close with respect to the center hook 70C.

[0044] When the first side hook 70L closes with respect to the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a form that allows it to move between the first side hook 70L and the center hook 70C. Also, when the second side hook 70R closes with respect to the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a form that prevents it from coming out between the second side hook 70R and the center hook 70C.

[0045] The wire locking body 70 starts to move in a direction approaching the center hook 70C for the second side hook 70R and locks the wire W, and at the same time, starts to move in a direction approaching the center hook 70C for the first side hook 70L and locks the wire W. Note that the first side hook 70L may start to move in a direction approaching the center hook 70C between the start of the movement of the second side hook 70R in a direction approaching the center hook 70C and the locking of the wire W between the second side hook 70R and the center hook 70C.

[0046] The wire locking body 70 includes a bending portion 71c1 that forms the wire W into a predetermined shape by pushing and bending the tip side, which is one end of the wire W, in a predetermined direction. Further, the wire locking body 70 holds the wire W before being cut by the cutting portion 6A, and forms a bending portion 71c2 that forms the wire W into a predetermined shape by pushing and bending the end side, which is the other end of the wire W cut by the cutting portion 6A, in a predetermined direction.

[0047] The sleeve 71 has an end portion in the forward direction indicated by the arrow A1 that is divided into two parts with the first side hook 70L, the second side hook 70R, and the center hook 70C interposed therebetween, and the bending portion 71c1 is formed at the end portion in the forward direction located on the upper side in the non-rotating region, and the bending portion 71c2 is formed at the end portion in the forward direction located on the lower side.

[0048] The sleeve 71 moves in the front-rear direction, which is one direction along the axial direction of the rotation shaft 72 indicated by the arrows A1 and A2, so that the bending portion 71c2 that constitutes the first member of the wire holding portion and the anti-drop portion 70La that 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 the relatively approaching and separating directions.

[0049] Thereby, when the sleeve 71 moves in the forward direction indicated by the arrow A1, it presses the wire W passing between the center hook 70C and the first side hook 70L with the bending portion 71c2. The bending portion 71c2 holds the wire W between itself and the anti-drop portion 70La of the first side hook 70L.

[0050] The bending portion 71c2 is configured to hold the wire W by pressing and bending the wire W against the anti-drop portion 70La of the first side hook 70L. Therefore, in the configuration of binding the reinforcing bar S with two wires W, if the bending of the two wires W starts at the same timing, the load at the start of the bending operation increases.

[0051] Therefore, in the configuration where the reinforcing bar S is bundled using two wires, in order to shift the timing at which the bending of the two wires W starts, the bending portion 71c2 includes a first wire holding portion 71c2a that starts bending one wire W first, and a second wire holding portion 71c2b that starts bending the other wire W after the first wire holding portion 71c2a starts bending one wire W.

[0052] In the bending portion 71c2, the first wire holding portion 71c2a and the second wire holding portion 71c2b are arranged along the direction in which the two wires W are parallel, and the first wire holding portion 71c2a protrudes in the forward direction indicated by the arrow A1 with respect to the second wire holding portion 71c2b.

[0053] As a result, when the sleeve 71 moves in the forward direction indicated by the arrow A1, the first wire holding portion 71c2a comes into contact with one wire W first. Then, at 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] The first wire holding portion 71c2a and the second wire holding portion 71c2b are provided in the rear direction along the axial direction of the rotation axis 72 indicated by the arrow A2 and in the downward direction perpendicular to the axial direction of the rotation axis 72 with respect to the retaining portion 70La for preventing the first side hook 70L from coming off, in a region where the sleeve 71 does not rotate. As a result, the first wire holding portion 71c2a and the second wire holding portion 71c2b come into contact with the wire W between the retaining portion 70La for preventing the first side hook 70L from coming off and the cutting portion 6A, that is, below the retaining portion 70La for preventing the first side hook 70L from coming off.

[0055] Further, after the wire W is cut at the cutting portion 6A, the sleeve 71 moves further in the forward direction indicated by the arrow A1, and by pressing the tip side of the wire W locked by the center hook 70C and the second side hook 70R with the bending portion 71c1, it is bent toward the reinforcing bar S side. Further, the sleeve 71 moves in the forward direction indicated by the arrow A1, and by pressing the terminal side of the wire W locked by the center hook 70C and the first side hook 70L and cut at the cutting portion 6A with the bending portion 71c2, it is bent toward the reinforcing bar S side.

[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 interlocked with the rotation operation of the rotation shaft 72. The rotation restricting portion 74 is provided with rotation restricting vanes 74a on the sleeve 71 and rotation restricting claws 74b on the main body portion 10A.

[0057] The rotation restricting vanes 74a are configured by providing a plurality of convex portions protruding radially from the outer periphery of the sleeve 71 at predetermined intervals in the circumferential direction of the sleeve 71. The rotation restricting vanes 74a are fixed to the sleeve 71 and move and rotate integrally with the sleeve 71.

[0058] The rotation restricting portion 74 locks the wire W with the wire locking body 70, winds the wire W around the reinforcing bar S, then cuts it with the cutting portion 6A while holding the wire W with the bending portion 71c2 of the sleeve 71, and further, in the operation range where the wire W is bent and formed by the bending portions 71c1 and 71c2 of the sleeve 71, the rotation restricting vanes 74a are locked to the rotation restricting claws 74b. When the rotation restricting vanes 74a are locked to the rotation restricting claws 74b, the rotation of the sleeve 71 interlocked with the rotation of the rotation shaft 72 is restricted, and the sleeve 71 moves in the front-rear direction by the rotation operation of the rotation shaft 72.

[0059] Further, in the operating range where the wire locking body 70 twists the wire W locked by it, the locking between the rotation restricting blade 74a and the rotation restricting claw 74b is released. When the locking between the rotation restricting blade 74a and the rotation restricting claw 74b is released, the sleeve 71 rotates in conjunction with the rotation of the rotary shaft 72. The wire locking body 70 rotates the center hook 70C, the first side hook 70L, and the second side hook 70R that lock the wire W in conjunction with the rotation of the sleeve 71. In the operating range of the sleeve 71 and the wire locking body 70 along the axial direction of the rotary shaft 72, the operating range where the wire locking body 70 locks the wire W is referred to as the first operating range. Also, the operating range where the wire W locked by the wire locking body 70 in the first operating range is twisted is referred to as the second operating range.

[0060] The binding portion 7A is provided such that the moving member 83 can move in conjunction with the sleeve 71. The moving member 83 is rotatably attached to the sleeve 71, and is non - interlocked with the rotation of the sleeve 71 and moves in the front - rear direction in conjunction with the sleeve 71.

[0061] The moving member 83 includes 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 binding portion 7A causes the transmission mechanism 62 to transmit the movement of the moving member 83 to the movable blade portion 61 and rotate the movable blade portion 61. Thereby, in the operation where the sleeve 71 moves forward, the movable blade portion 61 rotates in a predetermined direction and the wire W is cut.

[0062] The end portion 7A includes a tension-applying spring 92 that enables bundling to be performed while applying tension to the wire W. The tension-applying spring 92 is provided outside the sleeve 71, and biases the sleeve 71 and the wire locking body 70 in a direction away from the abutting portion 91 along the axial direction of the rotating shaft 72. The tension-applying spring 92 is constituted by, for example, a coil spring that expands and contracts in the axial direction, and is fitted on the outer periphery of the sleeve 71 between the rotation restricting blade 74a and the support frame 76d that rotatably and slidably supports the sleeve 71 in the axial direction. When the tension-applying spring 92 is constituted by a coil spring, the inner diameter is configured to be larger than the outer diameter of the sleeve 71. Note that the tension-applying 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 a plurality of disc springs, etc. configured to bias the sleeve 71 along the axial direction of the rotating shaft 72.

[0063] The tension-applying spring 92 is compressed between the support frame 76d and the rotation restricting blade 74a according to the position of the sleeve 71 along the axial direction of the rotating shaft 72, and biases the sleeve 71 in the rearward direction, which is the direction away from the abutting portion 91 along the axial direction of the rotating shaft 72. Thereby, the tension-applying spring 92 feeds the wire W in the reverse direction and biases the wire locking body 70 provided with the sleeve 71 in a direction to maintain the tension applied to the wire W during the operation of winding the wire W around the reinforcing bar S.

[0064] Thereby, when the sleeve 71 moves forward and is compressed, the tension-applying spring 92 applies a tension to the wire W wound around the reinforcing bar S and then cut at the cutting portion 6A with a force greater than the force applied in the direction in which the wire W wound around the reinforcing bar S loosens. Therefore, bundling can be performed while applying tension to the wire W after cutting.

[0065] Further, the wire locking body 70 is configured to be movable forward while receiving the force that the sleeve 71 is pushed rearward by the tension-applying spring 92 and receiving the force that the rotating shaft 72 is pushed rearward by the spring 72c.

[0066] <Operation example of the reinforcing bar bundling machine of the present embodiment> Figs. 4A and 4B are side views of the main part of the steel bar bundling machine according to the present embodiment, and Fig. 4C is a perspective view of the main part of the steel bar bundling machine according to the present embodiment, showing the operations during wire holding and cutting.

[0067] Next, with reference to each figure, the operation of bundling the steel bar S with the wire W by the steel bar bundling machine 1A according to the present embodiment will be described.

[0068] In the steel bar bundling machine 1A, the wire W is clamped between a pair of feed gears 30, and the state where 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 portion 6A is the standby state. Also, in the standby state, the wire locking body 70 of the steel bar bundling machine 1A moves in the rear direction indicated by the arrow A2, and as shown in Fig. 2B and the like, the first side hook 70L opens with respect to the center hook 70C, and the second side hook 70R opens with respect to the center hook 70C. Further, in the standby state, the rotation restricting vane 74a of the steel bar bundling machine 1A is separated from the tension applying spring 92, and the sleeve 71 and the wire locking body 70 are not urged rearward by the tension applying spring 92.

[0069] When the steel bar S is inserted between the curl guide 50 and the guide guide 51 of the curl forming portion 5A and the trigger 12A is operated, a 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 by the wire feed portion 3A.

[0070] In the case of a configuration in which the steel bar S is bundled with a plurality of, for example, two wires W, the two wires W are fed in a state of being arranged in parallel along the axial direction of the loop Ru formed by the wire 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 sent to the curl guide 50 of the curl forming portion 5A. By passing through the curl guide 50, the wire W is given a curl wound around the steel bar S.

[0072] The wire W with a curl formed by the curl guide 50 is guided by the guide guide 51 and further fed in the forward direction by the wire feeding unit 3A, and thus is guided between the center hook 70C and the second side hook 70R by the guide guide 51. Then, the wire W is fed until the tip thereof abuts against the feed restricting portion 90. When the tip of the wire W is fed to the position where it abuts against the feed restricting portion 90, the drive of the feed motor (not shown) is stopped.

[0073] After the forward feeding of the wire W is stopped, the motor 80 is driven in the forward rotation direction. In the first operating range where the wire locking body 70 locks the wire W, the rotation of the sleeve 71 linked to the rotation of the rotary shaft 72 is restricted because the rotation restricting vane 74a is locked to the rotation restricting claw 74b. As a result, the rotation of the motor 80 is converted into linear movement, and the sleeve 71 moves in the direction of arrow A1 which is the forward direction.

[0074] When the sleeve 71 moves forward, the opening and closing pin 71a passes through the opening and closing guide hole 73. As a result, the first side hook 70L moves in a direction approaching the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. When the first side hook 70L closes with respect to the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a form 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 a rotational movement with the shaft 71b as a fulcrum. When the second side hook 70R closes with respect to the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a form that does not allow it to come out from between the second side hook 70R and the center hook 70C. In the first operating range where the wire tying machine 1A locks the wire W with the wire locking body 70, the sleeve 71 and the wire locking body 70 are not biased rearward by the tension applying spring 92, and no load is applied by the tension applying spring 92 during the movement of the sleeve 71 and the wire locking body 70 in the forward direction of arrow A1.

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

[0077] As a result, the pair of feed gears 30 reverses, and the wire W sandwiched between the pair of feed gears 30 is fed in the reverse direction indicated by the arrow R. Since the tip side of the wire W is locked in a form that does not come out between the second side hook 70R and the center hook 70C, the wire W is wound around the reinforcing bar S in 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 drive of the feed motor (not shown) in the reverse rotation direction, the motor 80 is driven in the forward rotation direction to move the sleeve 71 further in the forward direction 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 in the forward direction indicated by the arrow A1, and first, the first wire holding portion 71c2a comes into contact with one of the two wires W1 passing between the center hook 70C and the first side hook 70L. When the sleeve 71 moves further forward, one wire W1 is pressed against the retaining portion 70La of the first side hook 70L by the first wire holding portion 71c2a, and as shown in FIG. 4A, one wire W1 is bent in the forward direction along the axial direction of the rotation axis 72 indicated by the arrow A1 along the retaining portion 70La between the retaining portion 70La and the cutting portion 6A.

[0080] As a result, one wire W1 is held in a form of being sandwiched in the front-rear direction, which is one direction along the axial direction of the rotation axis 72 indicated by the arrows A1 and A2, and the vertical direction, which is the other direction orthogonal to the axial direction of the rotation axis 72, between the first wire holding portion 71c2a and the retaining portion 70La.

[0081] When the operation of the sleeve 71 moving forward is transmitted by the transmission mechanism 62 to the cutting portion 6A, the movable blade portion 61 rotates. When the movable blade portion 61 rotates, due to the shapes of the fixed blade portion 60 and the movable blade portion 61, the cutting of one wire W1 held between the first wire holding portion 71c2a and the anti - detachment portion 70La starts at a timing earlier than the cutting of the other wire W2.

[0082] When the sleeve 71 moves forward, the bending of one wire W1 is started by the first wire holding portion 71c2a. At a timing substantially simultaneous with the end of the cutting of one wire W1, the second wire holding portion 71c2b contacts the other wire W2. When the sleeve 71 moves further forward, the other wire W2 is pressed against the anti - detachment portion 70La of the first side hook 70L by the second wire holding portion 71c2b. As shown in FIG. 4B, the other wire W2 bends forward along the axial direction of the rotation axis 72 indicated by the arrow A1 along the anti - detachment portion 70La between the anti - detachment portion 70La and the cutting portion 6A.

[0083] As a result, the other wire W2 is held in a form of being sandwiched between the second wire holding portion 71c2b and the anti - detachment portion 70La in the front - rear direction, which is one direction along the axial direction of the rotation axis 72 indicated by the arrows A1 and A2, and the up - down direction, which is the other direction orthogonal to the axial direction of the rotation axis 72. Also, before the timing when the second wire holding portion 71c2b starts holding the other wire W2, the cutting of one wire W1 is started at the cutting portion 6A.

[0084] When the other wire W2 is held between the second wire holding portion 71c2b and the anti - detachment portion 70La and the sleeve 71 moves further forward, the other wire W2 held between the second wire holding portion 71c2b and the anti - detachment portion 70La is cut by the operations 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 of the two wires W before cutting, i.e., wire W1, passing between the center hook 70C and the first side hook 70L, is held between the first wire holding portion 71c2a that forms the bent portion 71c2 of the sleeve 71 and the retaining portion 70La of the first side hook 70L, thereby suppressing loosening of the wire W1 before cutting wound around the reinforcing bar S. Further, the other wire W2 is held between the second wire holding portion 71c2b that forms the bent portion 71c2 of the sleeve 71 and the retaining portion 70La of the first side hook 70L, thereby suppressing loosening of the wire W2 before cutting wound around the reinforcing bar S.

[0086] In a configuration where 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 the pair of feed gears 30, when the wire W is cut at this 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 being twisted.

[0087] In contrast, in the present embodiment, after the wire W is wound around the reinforcing bar S, the wire W before cutting passing 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 form the bent portion 71c2 of the sleeve 71 and the retaining portion 70La of the first side hook 70L. Thereby, loosening of the wire W wound around the reinforcing bar S before being twisted is suppressed. Further, by shifting the timing of holding and cutting of one wire W1 and holding and cutting of the other wire W2, the load at the start of holding of the wire W is reduced compared to the case where the holding of the two wires W starts simultaneously, and the load at the start of cutting of the wire W is reduced compared to the case where the cutting of the two wires W starts simultaneously.

[0088] Furthermore, when the wire W is cut, the tension applied to the wire W is released, and the sleeve 71 attempts 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 being twisted.

[0089] In contrast, in this embodiment, the reinforcing bar bundling machine 1A moves the sleeve 71 and the wire locking body 70 forward. In the operating range where the wire W is cut, the rotation restricting blade 74a contacts the tension applying spring 92, and the tension applying spring 92 is compressed between the support frame 76d and the rotation restricting blade 74a, and the sleeve 71 and the wire locking body 70 are biased backward by the tension applying spring 92.

[0090] Thereby, by suppressing the forward movement of the sleeve 71, it is possible to suppress a decrease in the force pulling the wire W locked by the wire locking body 70 backward, and it is possible to suppress the wire W wound around the reinforcing bar S from loosening before being twisted.

[0091] Note that if the sleeve 71 and the wire locking body 70 are biased backward by the tension applying spring 92 throughout the entire first operating range where 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, the reinforcing bar bundling machine 1A has the rotation restricting blade 74a separated from the tension applying spring 92. In the first operating range where the wire W is locked by the wire locking body 70, in the initial operating range where the first side hook 70L and the second side hook 70R close, the sleeve 71 and the wire locking body 70 are not biased backward by the tension applying spring 92. Thereby, in the initial operating range of the first operating range where the wire W is locked by the wire locking body 70, when the sleeve 71 and the wire locking body 70 move in the forward direction of the arrow A1, no load is applied due to the load that biases the sleeve 71 and the wire locking body 70 backward by the tension applying spring 92. Therefore, it is possible to suppress an increase in the load on the motor 80 in a region where the load by the tension applying spring 92 is unnecessary.

[0093] On one hand, the rotating shaft 72 is connected to the speed reducer 81 via a connecting portion 72b configured to be rotatable integrally with the speed reducer 81 and axially movable relative to the speed reducer 81. In the initial operating range of the first operating range where the wire W is locked by the wire locking body 70 from the standby position, since the sleeve 71 and the wire locking body 70 are not biased rearward by the tension applying spring 92, in the initial operating range of the first operating range, the axial position of the rotating shaft 72 cannot be restricted by the tension applying spring 92. Therefore, the connecting portion 72b is provided with a spring 72c that biases the rotating shaft 72 rearward, which is the direction approaching the speed reducer 81. Thereby, the rotating shaft 72 is restricted in position by receiving the force pushed rearward by the spring 72c unless a force for moving it forward exceeds the biasing force of the spring 72c.

[0094] Therefore, by suppressing an increase in the load applied to the motor 80 in a region where the load due to the biasing of the tension applying spring 92 is unnecessary, an increase in the load applied to the motor 80 etc. throughout one binding cycle can be suppressed, and a decrease in the durability of the components can be suppressed. Furthermore, by providing the spring 72c, inadvertent movement of the rotating shaft 72 can be suppressed in a region where the biasing force of the tension applying spring 92 is not applied.

[0095] By driving the motor 80 in the forward rotation direction, when the sleeve 71 is moved forward as indicated by the arrow A1 to cut the wire W, almost simultaneously, the bending portion 71c1 moves in the direction approaching the steel bar S. Thereby, the tip side of the wire W locked by the center hook 70C and the second side hook 70R is pressed toward the steel bar S side by the bending portion 71c1 and bent toward the steel bar S side with the locking position as the fulcrum. As the sleeve 71 moves further forward, the wire W locked between the second side hook 70R and the center hook 70C is held in a state of being pinched by the bending portion 71c1.

[0096] Also, the terminal side of the wire W cut by the cutting portion 6A 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 anti - detachment portion 70La of the first side hook 70L. The terminal side of the wire W is further pressed toward the reinforcing bar S side by the bent portion 71c2 and bent toward the reinforcing bar S side with the locking position as the fulcrum. As the sleeve 71 moves further forward, the wire W locked between the first side hook 70L and the center hook is held in a state of being sandwiched by the bent portion 71c2.

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

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

[0099] In the second operating range where the sleeve 71 rotates to twist the wire W, the binding portion 7A is such that when the wire W locked by the wire locking body 70 is twisted, a force that pulls the wire locking body 70 forward along the axial direction of the rotary shaft 72 is applied. On the other hand, when the sleeve 71 moves forward to a position where it can rotate, the tension - applying spring 92 is further compressed, and the sleeve 71 receives a force that pushes it backward by the tension - applying spring 92.

[0100] As a result, when a force that moves the wire locking body 70 and the rotary shaft 72 forward along the axial direction is applied to the wire locking body 70, the sleeve 71 receives a force that pushes it backward by the tension - applying spring 92, and the rotary shaft 72 moves forward while receiving a force that pushes it backward by the spring 72c, and twists the wire W while moving forward.

[0101] Therefore, the wire W is pulled backward at the portion locked by the wire locking body 70, tension is applied in the tangential direction of the reinforcing bar S, and the wire W is pulled so as to be in close contact with the reinforcing bar S. The binding portion 7A is in the second operating range where the sleeve 71 rotates to twist the wire W. When the wire locking body 70 further rotates in conjunction with the rotation shaft 72, the wire locking body 70 and the rotation shaft 72 move in the forward direction, which is the direction in which the gap between the twisted portion of the wire W and the reinforcing bar S becomes smaller, while further twisting the wire W.

[0102] Accordingly, the wire W is twisted while the wire locking body 70 and the rotation shaft 72 move forward while receiving a force pushed backward by the tension applying spring 92 and the spring 72c. As a result, the gap between the twisted portion of the wire W and the reinforcing bar S becomes smaller, and the wire W adheres to the reinforcing bar S in a form along the reinforcing bar S. Thereby, the slack before twisting the wire W can be removed, and the wire W can be bound in a state of being in close contact with the reinforcing bar S.

[0103] When it is detected that the load applied to the motor 80 has reached the maximum by twisting the wire W, the forward rotation of the motor 80 is stopped. Next, when the motor 80 is driven in the reverse rotation direction, the rotation shaft 72 rotates in the reverse direction. When the sleeve 71 rotates in the reverse direction following the reverse rotation of the rotation shaft 72, the rotation restricting blade 74a is locked to the rotation restricting claw 74b, thereby restricting the rotation of the sleeve 71 linked to the rotation of the rotation shaft 72. As a result, the sleeve 71 moves in the direction of arrow A2, which is the rear direction.

[0104] When the sleeve 71 moves in the rear direction, 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. Further, when the sleeve 71 moves in the rear direction, the opening and closing pin 71a passes through the opening and closing guide hole 73. As a result, the first side hook 70L moves in a direction away from the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. Also, the second side hook 70R moves in a direction away from the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. Thereby, the wire W comes out of the wire locking body 70.

Description of Reference Numerals

[0105] 1A... Steel bar bundling machine, 10A... Main body, 2A... Magazine, 20... Reel, 3A... Wire feeding section, 30... Feeding gear, 5A... Crimp forming section, 50... Crimp guide, 51... Inductive guide, 6A... Cutting section, 60... Fixed blade section, 61... Movable blade section, 62... Transmission mechanism, 7A... Bundling section, 70... Wire locking body, 70L... First side hook, 70La... Anti-slip section (wire holding section, second member), 70R... Second side hook, 70C... Center hook, 71... Sleeve, 71c1... Bending section, 71c2... Bending section (wire holding section, first member), 71c2a... First wire holding section, 71c2b... Second wire holding section, 72... Rotating shaft, 8A... Driving section, 80... Motor, W... Wire

Claims

1. A wire feeding unit that feeds the wire; 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 holds a wire that has been fed in another direction by the wire feed section and wound around a bundle by a movement of the first member and the second member relatively approaching each other along the axial direction of the rotation shaft, and the wire holding section holds the wire that has been fed in another direction by the wire feed section and wound around a bundle by a movement of the first member and the second member relatively approaching each other. The wire holding portion holds a part of the wire before cutting, opposite to the tip of the wire wound around the bundle, by bending the part along the axial direction of the rotation shaft, The cutting section is provided on a wire feed path between the wire feed section and the wire holding section, and cuts the wire after the wire is held by the wire holding section. Binding machine.

2. 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 1.

3. 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 linearly acting rotation member and the second member provided on the locking member. The binding machine according to claim 1 or 2.

4. 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.

Images