Binding machine

Abstract

A wire bundling machine is provided, which reduces the reaction force of the force pressing the wire between a pair of hooks by locking the wire. The wire bundling part of the rebar bundling machine includes a locking component (70) for locking the wire in the twisting wire bundling part. The locking component (70) includes a first side hook (70R), a second side hook (70L), and a center hook (70C). The second side hook (70L) includes a locking part (73b) and a locking release part (73d). The locking part (73b) locks the wire in a state where the second side hook (70L) is moved toward the center hook (70C) by contacting the opening and closing pin (71a) linked to the sleeve (71). The locking release part (73d) can move the second side hook (70L) away from the center hook (70C) by a movement amount that prevents the locked wire from coming out of the space between the second side hook (70L) and the center hook (70C).

Description

Technical Field

[0001] This invention relates to a bundling machine for bundling reinforcing bars and other bundled materials with wire. Prior Technology

[0002] In concrete structures, steel bars are used to increase strength. During concrete pouring, the steel bars are bundled with wire to prevent them from deviating from their intended positions.

[0003] Previously, a binding machine was proposed that uses wire to wrap around two or more steel bars and twist the wire wrapped around the steel bars to bind these two or more steel bars.

[0004] The rebar bundling machine includes a feeding unit capable of feeding wire and winding it around the bundle, and a bundling unit capable of holding and twisting the wire. The bundling unit includes a pair of holding members, which are rotatably supported at one end, allowing them to move toward each other in a direction of approach and separation. Moreover, the wire is held in a structure by moving the holding members toward each other (see, for example, Patent Document 1). [Existing technical documents] [Patent Literature]

[0005] Patent Document 1: Japanese Patent No. 6763385 Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] During the action of holding (locking) the wire, the reaction force of the force pressing the wire between a pair of holding parts (hooks) is applied to the motor driving the bundling unit, becoming the load of the motor.

[0008] This invention was made to solve such a problem, and its purpose is to provide a bundling machine that can reduce the reaction force of the force pressing the wire between a pair of hooks by locking the wire. [Technical solution used to solve the problem]

[0009] To address the aforementioned issues, the present invention provides a bundling machine, comprising: a wire feeding section for feeding wire; a coiling forming section for forming a path for winding the wire fed by the wire feeding section around the bundle; a cutting section for cutting the wire wound around the bundle; and a bundling section for twisting the wire wound around the bundle and cut by the cutting section. The bundling section includes a locking member comprising a first hook and a second hook, and moves the first hook toward the direction of approaching the second hook to lock the wire. The locking member includes: a locking part that locks the wire when the first hook has moved toward the direction of approaching the second hook; and a locking release part that moves the first hook toward the direction of away from the second hook by an amount of movement that prevents the locked wire from slipping out from between the first hook and the second hook.

[0010] In this invention, the action of locking the line while at least one hook has moved toward the other hook and the action of moving at least one hook toward the other hook with a movement amount that prevents the locked line from coming off between the hooks of one and the other are switched. [Invention Effects]

[0011] According to the present invention, at times other than when the locking member is needed to lock the wire, at least one hook can be moved away from the other hook by a movement that prevents the locked wire from slipping out from between the hooks of one side, thereby reducing the reaction force of the force pressing the wire between the hooks of one side. As a result, the load applied to the motor driving the bundling section is reduced. Simple Explanation of the Diagram

[0012] Figure 1 is an internal structural diagram viewed from the side, showing an example of the overall structure of the rebar bundling machine of this embodiment. Figure 2A is an internal structural diagram viewed from the side, showing an example of the main structure of the rebar bundling machine of this embodiment. Figure 2B is an internal structural diagram viewed from the side, showing an example of the main structure of the rebar bundling machine of this embodiment. Figure 2C is an internal structural diagram viewed from the side, showing an example of the main structure of the rebar bundling machine of this embodiment. Figure 3A is a top view showing an example of the binding part in this embodiment. Figure 3B is a top view showing an example of the binding part in this embodiment. Figure 3C is a top view showing an example of the binding part in this embodiment. Figure 3D is a top view showing the main part of a modified example of the binding part in this embodiment. Figure 3E is a top view showing a modified example of the binding part in this embodiment. Figure 3F is a top view showing a modified example of the binding part in this embodiment. Figure 4A is a top view showing an example of the cut-off portion in this embodiment. Figure 4B is a top view showing an example of the cut-off portion in this embodiment. Figure 4C is a perspective view showing an example of the cut-off portion of this embodiment. Figure 4D is a perspective view showing an example of the cut-off portion of this embodiment. Figure 4E is a perspective view showing an example of the cut-off portion in this embodiment. Figure 4F is a top view showing a modified example of the cut-off portion of this embodiment. Figure 4G is a top view showing a modified example of the cut-off portion of this embodiment. Figure 5A is a side sectional view showing an example of the speed reducer of this embodiment. Figure 5B is a perspective view showing an example of the speed reducer of this embodiment. Figure 5C is a partial side sectional view showing a modified example of the speed reducer of this embodiment. Figure 5D is a perspective view showing a modified example of the speed reducer of this embodiment. Figure 6A is a top view showing an example of the curling forming section of this embodiment. Figure 6B is a top view showing an example of the curling forming section of this embodiment. Figure 6C is a top view showing an example of the curling forming section of this embodiment. Figure 6D is a top view showing an example of the curling forming section of this embodiment. Figure 7A is an operational illustration diagram showing an example of the operation of the binding part, the transmission part, and the cutting part in this embodiment. Figure 7B is an operational illustration diagram showing an example of the operation of the binding part, the transmission part, and the cutting part in this embodiment. Figure 7C is an operational illustration diagram showing an example of the operation of the binding part, the transmission part, and the cutting part in this embodiment. Figure 7D is an operational illustration diagram showing an example of the operation of the binding part, the transmission part, and the cutting part in this embodiment. Figure 7E is an operational illustration diagram showing an example of the operation of the binding part, the transmission part, and the cutting part in this embodiment. Figure 7F is an operational illustration diagram showing an example of the operation of the binding part, the transmission part, and the cutting part in this embodiment. Figure 7G is an operational illustration diagram showing an example of the operation of the binding part, the transmission part, and the cutting part in this embodiment. Figure 8A is a side view showing a modified example of the transmission unit in this embodiment. Figure 8B is a side view showing a modified example of the transmission unit in this embodiment. Figure 8C is a side view showing a modified example of the transmission unit in this embodiment. Figure 9A is a side sectional view showing a modified example of the transmission section of this embodiment. Figure 9B is a side sectional view showing a modified example of the transmission section of this embodiment. Figure 9C is a side sectional view showing a modified example of the transmission section of this embodiment. Implementation

[0013] Hereinafter, with reference to the accompanying drawings, an example of a steel bar bundling machine as an embodiment of the bundling machine of the present invention will be described.

[0014] <Example of the overall structure of the rebar bundling machine in this embodiment> Figure 1 is an internal structural diagram viewed from the side, showing an example of the overall structure of the rebar bundling machine of this embodiment.

[0015] The rebar bundling machine 1A feeds wire W in the positive direction as indicated by arrow F, and winds it around the rebar S that serves as the bundle. After the wire W wrapped around the rebar S is fed in the opposite direction as indicated by arrow R and wound around the rebar S and cut, the wire W is twisted and used to bundle the rebar S.

[0016] To achieve the above functions, the rebar bundling machine 1A includes a housing 2 for holding wire W, a wire feed section 3 for feeding the wire W, and a wire guide 4 for guiding the wire W. Furthermore, the rebar bundling machine 1A includes a coiling forming section 5 that forms a path for winding the wire W fed by the wire feed section 3 around the rebar S, and a cutting section 6 that cuts the wire W wound around the rebar S. Moreover, the rebar bundling machine 1A includes a bundling section 7 that twists the wire W wound around the rebar S, a drive section 8 that drives the bundling section 7, and a transmission section 9 that transmits the action of the bundling section 7 to the cutting section 6.

[0017] In addition, the rebar bundling machine 1A is designed for hand-held use by the operator and includes a main body 10 and a handle 11.

[0018] The casing 2 is an example of a containment section that rotates, removably contains a reel 20, which is wound with a long strip of wire W in a manner capable of being extracted. Wire W uses a wire composed of a metal wire capable of plastic deformation, a wire in which the metal wire is covered with resin, or a wire with a cocked wire.

[0019] In a structure with a wire W bundled reinforcement S , a wire W is wound around the unillustrated yoke portion of the reel 20 , which rotates while pulling out a wire W . In addition, in a structure with multiple wires W bundled reinforcement S , multiple wires W are coiled in the yoke part, and the reel 20 is rotating while pulling out multiple wires W at the same time. For example, in a structure with two wires W bundled reinforcement S , two wires W are coiled around the yoke part, and the reel 20 pulls out two wires W simultaneously while rotating.

[0020] The wire feed portion 3 includes a pair of feed gears 30 that clamp and feed the wire W. The wire feed portion 3 rotates the feed gear 30 by transmitting the rotational action of the feed motor not illustrated. Thereby, the wire feed portion 3 feeds the wire W clamped between a pair of feed gears 30 along the extension direction of the wire W . In a structure that feeds multiple, e.g., two wires W and bundled reinforcement S , the two wires W are fed in a side-by-side state.

[0021] The wire feed 3 switches the rotation direction of the feed gear 30 by switching the rotation direction of the unillustrated feed motor, switching the feed wire W in the positive direction indicated by arrow F, or switching the feed wire W in the reverse direction indicated by the arrow R.

[0022] The wire guide 4 is disposed at a predetermined position on the upstream and downstream sides of the wire feed portion 3 with respect to the feed direction that feeds the wire W in the positive direction. In a structure that feeds two wires W and bundles reinforcement S , a wire guide 4 disposed on the upstream side of the wire feed part 3 limits the orientation of the radial direction of the two wires W , directing the two incoming wires W in tandem between a pair of feed gears 30 . A wire guide 4 disposed on the downstream side of the wire feed portion 3 limits the orientation of the radial direction of the two wires W, directing the incoming two wires W side by side to the cutting portion 6 and the curl forming portion 5 .

[0023] The coiling forming section 5 includes: a coiling guide 50, which imparts a coiling tendency to the wire W fed by the wire feed section 3; and a guide guide 51, which guides the wire W, which has been imparted a coiling tendency by the coiling guide 50, to the bundling section 7. In the rebar bundling machine 1A, the path of the wire W fed by the wire feed section 3 is restricted by the coiling forming section 5, thereby forming a loop Ru as shown by the two-point chain line in the first figure, with the wire W coiled around the rebar S.

[0024] The coiling guide 50 and the guide guide 51 of the coiling forming part 5 of the rebar bundling machine 1A are provided at the end of the front side of the main body part 10.

[0025] The cutting section 6 includes a fixed blade 60 and a movable blade 61 that cooperates with the fixed blade 60 to cut the wire W. The cutting section 6 cuts the wire W by rotating the movable blade 61 around the fixed blade 60. In this specification, the cutting section 6 is described using the fixed blade 60 and the movable blade 61 that rotates around the fixed blade 60 as a fulcrum. However, the movable blade 61 may not rotate, but rather slide linearly.

[0026] The transmission unit 9 includes a cam 90 that rotates due to the movement of the binding unit 7, and a connecting rod 91 that connects the cam 90 and the movable blade 61. The transmission unit 9 transmits the movement of the binding unit 7 to the movable blade 61 of the cutting unit 6 via the cam 90 and the connecting rod 91.

[0027] The bundling section 7 includes a locking member 70 for locking the wire W and a sleeve 71 for actuating the locking member 70. The drive section 8 includes a motor 80 and a reducer 81 for deceleration and torque amplification.

[0028] The binding part 7 is driven by the drive part 8, which causes the sleeve 71 to actuate the locking member 70 to lock the wire W. In addition, after the cutting part 6, which is linked to the action of the sleeve 71, cuts the wire W, the binding part 7 twists the wire W to bind the reinforcing bar S.

[0029] The wire feed section 3, wire guide 4, cutting section 6, bundling section 7, drive section 8, and transfer section 9 of the rebar bundling machine 1A are housed inside the main body 10. The bundling section 7 is located inside the front side of the main body 10, and the drive section 8 is located inside the rear side. In addition, the abutment section 16 for the rebar S to abut is located at the front end of the main body 10 between the coiling guide 50 and the guide guide 51.

[0030] Furthermore, in the rebar bundling machine 1A, the handle 11 extends downward from the main body 10, and a battery 15 is detachably installed at the lower part of the handle 11. In addition, in the rebar bundling machine 1A, the housing 2 is located in front of the handle 11.

[0031] The rebar bundling machine 1A has a trigger 12 on the front side of the handle 11 and a switch 13 inside the handle 11. The rebar bundling machine 1A controls the motor 80 and the feed motor (not shown) by the control unit 14 according to the state of the switch 13 pressed by the operation of the trigger 12.

[0032] <Example of the main structural components of the rebar bundling machine in this embodiment> Figures 2A to 2C are side views showing an example of the internal structure of the main components of the rebar bundling machine of this embodiment. Figure 2A mainly shows the bundling section 7, the cutting section 6, and the transfer section 9. Figure 2B shows the cutting section 6 and the transfer section 9 in Figure 2A in cross section. Figure 2C shows the outer shape of the sleeve 71 in Figure 2A and its internal structure using two-point chain lines. Figures 3A to 3C are top views showing an example of the bundling section of this embodiment, and Figures 3D to 3F are top views showing the main components of a modified example of the bundling section of this embodiment.

[0033] • Examples of implementation methods for the binding part Next, referring to the figures, an example of the binding part of this embodiment will be described. The binding part 7 includes a rotating shaft 72 that moves and rotates the sleeve 71 to actuate the locking member 70. In the binding part 7 and the drive part 8, the rotating shaft 72 and the motor 80 are connected via a reducer 81, and the rotating shaft 72 is driven by the motor 80 via the reducer 81.

[0034] The locking component 70 includes a central hook 70C (second hook) connected to the rotation shaft 72, a first side hook 70R that opens and closes relative to the central hook 70C, and a second side hook 70L (first hook).

[0035] In the binding section 7, the side with the center hook 70C, the first side hook 70R, and the second side hook 70L is designated as the front side, and the side with the rotating shaft 72 connected to the reducer 81 is designated as the rear side.

[0036] The center hook 70C is connected to one end, i.e. the front end, of the rotating shaft 72 via a structure that can rotate relative to the rotating shaft 72, rotate integrally with the rotating shaft 72, and move axially integrally with the rotating shaft 72.

[0037] One end of the first side hook 70R along the axial direction of the rotation axis 72, namely the front end side, is located on one side relative to the center hook 70C. In addition, the other end of the first side hook 70R along the axial direction of the rotation axis 72, namely the rear end side, is rotatably supported on the center hook 70C by the shaft 71b.

[0038] One end of the second side hook 70L along the axial direction of the rotation axis 72, namely the front end side, is located on the other side relative to the center hook 70C. In addition, the other end of the second side hook 70L along the axial direction of the rotation axis 72, namely the rear end side, is rotatably supported on the center hook 70C by the shaft 71b.

[0039] Therefore, the locking member 70 opens and closes in the direction of moving away from or approaching the center hook 70C relative to the front end of the first side hook 70R by rotating around the axis 71b. It also opens and closes in the direction of moving away from or approaching the center hook 70C relative to the front end of the second side hook 70L.

[0040] The other end, or rear end, of the rotating shaft 72 is connected to the reducer 81 via a connecting part 72b. This connecting part 72b has a structure that allows it to rotate integrally with the reducer 81 and to move axially relative to the reducer 81. The connecting part 72b includes a spring 72c, which applies a force to the rotating shaft 72 in a direction approaching the reducer 81, i.e., rearward, thus limiting the axial position of the rotating shaft 72. Therefore, the rotating shaft 72 is configured such that, while being subjected to a rearward pushing force from the spring 72c, it can move forward in a direction away from the reducer 81, i.e., forward. Thus, the rotating shaft 72 and the locking member 70 connected to the rotating shaft 72 can move forward by a predetermined amount specified by the connecting part 72b, while being subjected to a rearward pushing force from the spring 72c.

[0041] The sleeve 71, starting from the end in the forward direction indicated by arrow A1, is radially divided into two parts over a predetermined length along the axial direction of the rotating shaft 72, and is shaped to allow the first side hook 70R and the second side hook 70L to enter. Furthermore, the sleeve 71 is a cylindrical shape covering the periphery of the rotating shaft 72, and has a protrusion (not shown) protruding into the inner circumferential surface of the cylindrical space into which the rotating shaft 72 is inserted. This protrusion enters a groove in the feed screw 72a formed axially along the outer circumference of the rotating shaft 72.

[0042] When the rotating shaft 72 rotates, the sleeve 71 moves in the direction along the axial direction of the rotating shaft 72, i.e., the back-and-forth direction, under the action of the protrusion (not shown) and the feed screw 72a of the rotating shaft 72, according to the rotation direction of the rotating shaft 72. In addition, when the sleeve 71 moves to the front end of the feed screw 72a along the axial direction of the rotating shaft 72, it rotates together with the rotating shaft 72.

[0043] The sleeve 71 includes an opening and closing pin 71a for opening and closing a first side hook 70R and a second side hook 70L. The first side hook 70R has an opening and closing guide hole 73R for inserting the opening and closing pin 71a, and the second side hook 70L includes an opening and closing guide hole 73L (guide hole) for inserting the opening and closing pin 71a.

[0044] The opening and closing guide holes 73R and 73L are formed by grooves extending along the moving direction of the sleeve 71. The opening and closing guide hole 73R includes an opening and closing portion 73a with a shape that converts the linear movement of the opening and closing pin 71a, which moves in conjunction with the sleeve 71, into an opening and closing action based on the rotation of the first side hook 70R, which is fulcrumped by the shaft 71b. The opening and closing guide hole 73L also includes an opening and closing portion 73a with a shape that converts the linear movement of the opening and closing pin 71a, which moves in conjunction with the sleeve 71, into an opening and closing action based on the rotation of the second side hook 70L, which is fulcrumped by the shaft 71b. The opening and closing portion 73a is formed by a groove inclined relative to the moving direction of the sleeve 71 and the opening and closing pin 71a.

[0045] With the first side hook 70R open relative to the center hook 70C, when the sleeve 71 moves forward as indicated by arrow A1, the inner wall of the first side hook 70R in the opening / closing portion 73a formed in the opening / closing guide hole 73R is pushed by the opening / closing pin 71a in the closing direction of the first side hook 70R. As a result, the first side hook 70R rotates about the axis 71b as a fulcrum and moves relative to the center hook 70C in the approaching direction indicated by arrow H1.

[0046] With the first side hook 70R closed relative to the center hook 70C, when the sleeve 71 moves to the rearward side as indicated by arrow A2, the outer wall of the first side hook 70R in the opening / closing portion 73a formed in the opening / closing guide hole 73R is pushed by the opening / closing pin 71a in the opening / closing direction of the first side hook 70R. As a result, the first side hook 70R rotates about the axis 71b as a fulcrum and moves relative to the center hook 70C in the departing direction as indicated by arrow H2.

[0047] With the second side hook 70L open relative to the center hook 70C, when the sleeve 71 moves forward as indicated by arrow A1, the inner wall of the second side hook 70L in the opening / closing portion 73a formed in the opening / closing guide hole 73L is pushed by the opening / closing pin 71a in the closing direction of the second side hook 70L. As a result, the second side hook 70L rotates about the shaft 71b as a fulcrum and moves relative to the center hook 70C in the approaching direction indicated by arrow H1.

[0048] With the second side hook 70L closed relative to the center hook 70C, when the sleeve 71 moves to the rearward side as indicated by arrow A2, the second side hook 70L, in the opening / closing portion 73a formed in the opening / closing guide hole 73R, has its outer wall surface pushed by the opening / closing pin 71a in the opening / closing direction. As a result, the second side hook 70L rotates about the axis 71b as a fulcrum and moves relative to the center hook 70C in the departing direction as indicated by arrow H2.

[0049] The opening / closing guide hole 73L provided on the second side hook 70L includes a locking part 73b and a locking release part 73c. ​​In the opening / closing guide hole 73L, in the direction of movement of the sleeve 71 toward the front as indicated by arrow A1, a locking part 73b is formed on the downstream side of the opening / closing part 73a, and a locking release part 73c is formed on the downstream side of the locking part 73b.

[0050] The locking portion 73b is formed in the opening and closing guide hole 73L on the inner wall surface (first part) in the direction of closing the second side hook 70L, i.e., in the direction of arrow H1. The locking portion 73b is opposite to the outer wall surface of the opening and closing guide hole 73L, and is sized to the same degree as the diameter of the opening and closing pin 71a, and extends parallel to the outer wall surface.

[0051] The locking release part 73c is formed by providing a recess in the inner wall surface (second part) of the opening and closing guide hole 73L that is recessed relative to the locking part 73b. The locking release part 73c is opposite to the outer wall surface of the opening and closing guide hole 73L, with a size slightly larger than the diameter of the opening and closing pin 71a, and extends parallel to the outer wall surface.

[0052] As shown in Figure 3B, within the range of the locking portion 73b of the opening / closing pin 71a in the opening / closing guide hole 73L, the second side hook 70L locks the wire W in a state where movement of the wire W is not permitted. Here, within the range of the locking portion 73b of the opening / closing pin 71a in the opening / closing guide hole 73L, as described later, the operation of feeding the wire W in the opposite direction and winding it around the reinforcing bar S is performed.

[0053] In contrast, the opening / closing pin 71a moves in conjunction with the sleeve 71 in the direction of arrow A1, and as shown in Figure 3C, within the range of the locking release portion 73c of the opening / closing guide hole 73L, the second side hook 70L can move relative to the center hook 70C in the direction of departure shown by arrow H2 to a predetermined amount so that the wire W will not come out from between the second side hook 70L and the center hook 70C.

[0054] The sleeve 71 includes a bent portion 71c1, which shapes the wire W into a predetermined shape by pressing and bending the front end of one end of the wire W in a predetermined direction. Additionally, the sleeve 71 includes a bent portion 71c2, which shapes the wire W into a predetermined shape by pressing and bending the terminal end of the other end of the wire W after it has been cut by the cutting portion 6 in a predetermined direction. The bent portions 71c1 and 71c2 are formed at the forward-direction end of the sleeve 71, as indicated by arrow A1.

[0055] By moving forward in the direction indicated by arrow A1, sleeve 71 is pushed by bending portion 71c1 and bent towards the reinforcing bar S side, where the front end of wire W is held by center hook 70C and second side hook 70L. Additionally, by moving forward in the direction indicated by arrow A1, sleeve 71 is pushed by bending portion 71c2 and bent towards the reinforcing bar S side, where the end of wire W is held by center hook 70C and first side hook 70R and cut by cutting portion 6.

[0056] The binding part 7 includes a locking member 70 that restricts the rotation of the rotating shaft 72 and a rotation limiting part 74 that restricts the rotation of the sleeve 71. The rotation limiting part 74 includes a rotation limiting blade 74a in the sleeve 71 and a rotation limiting claw (not shown) in the main body 10 that locks the rotation limiting blade 74a.

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

[0058] In the area where the wire W is wound around the reinforcing bar S and then cut, and the wire W is bent by the bending portions 71c1 and 71c2 of the sleeve 71 to form its shape, the rotation limiting part 74 stops the rotation limiting blade 74a. When the rotation limiting blade 74a is stopped, the rotation of the sleeve 71, which is linked to the rotation of the rotation shaft 72, is restricted, and the sleeve 71 moves forward and backward by the rotation of the rotation shaft 72.

[0059] Furthermore, in the operating region where the wire W, which is held in place by the locking member 70, is twisted, the rotation limiting part 74 releases the locking of the rotation limiting blade 74a. When the locking of the rotation limiting blade 74a is released, the sleeve 71 rotates in conjunction with the rotation of the rotating shaft 72. The rotation of the locking member 70 and the sleeve 71, in conjunction with the rotation of the sleeve 71, locks the rotation of the center hook 70C, the first side hook 70R, and the second side hook 70L of the wire W. In the operating region of the sleeve 71 and the locking member 70 along the axial direction of the rotating shaft 72, the operating region where the wire W is held in place by the locking member 70 is referred to as the first operating region. In addition, the operating region where the wire W, which is held in place by the locking member 70, is twisted is referred to as the second operating region.

[0060] The binding part 7 includes a moving member 75 that actuates the transfer part 9. The moving member 75 is rotatably mounted relative to the sleeve 71 and is configured to move in the front-back direction in conjunction with the sleeve 71, independent of the rotation of the sleeve 71.

[0061] The moving part 75 includes an engaging part 75a that engages with the cam 90 of the transmission part 9. The engaging part 75a moves in the back-and-forth direction in conjunction with the sleeve 71, independent of the rotation of the sleeve 71.

[0062] Furthermore, as a variation of the opening / closing guide hole 73L provided on the second side hook 70L, in the variation shown in Figure 3D, the opening / closing guide hole 73L may also have a structure including a first locking portion 73b, a locking release portion 73c, and a second locking portion 73d. Relative to the forward movement direction of the sleeve 71 as indicated by arrow A1, the opening / closing guide hole 73L has a first locking portion 73b formed downstream of the opening / closing portion 73a, a locking release portion 73c formed downstream of the first locking portion 73b, and a second locking portion 73d formed downstream of the locking release portion 73c.

[0063] The first locking portion 73b and the second locking portion 73d are formed in the opening and closing guide hole 73L on the inner wall surface in the direction of closing the second side hook 70L, i.e., in the direction of arrow H1. The first locking portion 73b and the second locking portion 73d are opposite to the outer wall surface of the opening and closing guide hole 73L, and are sized to the same degree as the diameter of the opening and closing pin 71a, and extend parallel to the outer wall surface.

[0064] The locking release portion 73c is formed by providing a recess in the inner wall of the opening / closing guide hole 73L that is recessed relative to the first locking portion 73b and the second locking portion 73d. The locking release portion 73c is opposite to the outer wall of the opening / closing guide hole 73L, with a size slightly larger than the diameter of the opening / closing pin 71a, and extends parallel to the outer wall.

[0065] In the modified example shown in Figure 3D, by moving the opening and closing pin 71a in the direction of arrow A1, the opening and closing pin 71a moves along the inner wall of the opening and closing guide hole 73L. Within the range of the first locking part 73b of the opening and closing guide hole 73L, as shown by the solid line, the second side hook 70L locks the wire W in a state that does not allow the wire W to move.

[0066] In contrast, when the opening / closing pin 71a moves in the direction of arrow A1 and is located within the range of the locking release portion 73c of the opening / closing guide hole 73L as shown by the two-point chain line, the opening / closing guide hole 73L can be displaced relative to the opening / closing pin 71a to the position shown by the two-point chain line, and the second side hook 70L can be moved relative to the center hook 70C in the direction of departure shown by arrow H2 to a predetermined amount to which the wire W will not come out from between the second side hook 70L and the center hook 70C.

[0067] Furthermore, when the opening / closing pin 71a moves in the direction of arrow A1 and is located within the second locking portion 73d of the opening / closing guide hole 73L as shown by the dotted line, the wire W is locked in a state where movement of the wire W is not permitted. Here, within the range where the opening / closing pin 71a is located within the second locking portion 73d of the opening / closing guide hole 73L, as described later, the wire W is twisted using the bundling portion 7.

[0068] In the modified example shown in Figure 3E, the opening / closing guide hole 73L includes a first locking portion 73b, a locking release portion 73c, and a second locking portion 73d. The portion of the locking release portion 73c connected to the first locking portion 73b is positioned opposite the outer wall surface of the opening / closing guide hole 73L, with a dimension slightly larger than the diameter of the opening / closing pin 71a. Furthermore, the locking release portion 73c is formed by an inclined surface that slopes relative to the outer wall surface and is connected to the second locking portion 73d.

[0069] In the modified example shown in Figure 3E, by moving the opening and closing pin 71a in the direction of arrow A1, the opening and closing pin 71a moves along the inner wall of the opening and closing guide hole 73L. Within the range of the first locking part 73b of the opening and closing guide hole 73L, as shown by the solid line, the second side hook 70L locks the wire W in a state that does not allow the wire W to move.

[0070] Conversely, when the opening / closing pin 71a moves in the direction of arrow A1 and is located within the locking release portion 73c of the opening / closing guide hole 73L as shown by the two-point chain line, the opening / closing guide hole 73L can be displaced relative to the opening / closing pin 71a to the position shown by the two-point chain line. The second side hook 70L can move relative to the center hook 70C in the direction of departure as shown by arrow H2 by a predetermined amount to prevent the wire W from coming off between the second side hook 70L and the center hook 70C. Furthermore, when the opening / closing pin 71a is located within the locking release portion 73c of the opening / closing guide hole 73L, as the opening / closing pin 71a approaches the second locking portion 73d, the amount of movement of the second side hook 70L in the direction away from the center hook 70C decreases.

[0071] Furthermore, when the opening / closing pin 71a moves in the direction of arrow A1 and is located within the range of the second locking portion 73d of the opening / closing guide hole 73L as shown by the dotted line, the wire W is locked in a state where movement of the wire W is not permitted.

[0072] In the modified example shown in Figure 3F, the opening / closing guide hole 73L includes a first locking portion 73b, a locking release portion 73c, and a second locking portion 73d. The portion of the locking release portion 73c connected to the first locking portion 73b is positioned opposite the outer wall surface of the opening / closing guide hole 73L, with a dimension slightly larger than the diameter of the opening / closing pin 71a. Furthermore, the locking release portion 73c is formed by an inclined surface that slopes relative to the outer wall surface and is connected to the second locking portion 73d.

[0073] The second locking portion 73d is formed by an inclined surface connected to the locking release portion 73c. ​​The distance between the inner wall and the outer wall of the opening and closing guide hole 73L of the second locking portion 73d decreases towards the front side of the opening and closing guide hole 73L. At the front end of the opening and closing guide hole 73L, the inner wall and the outer wall are opposite each other with a size equal to the diameter of the opening and closing pin 71a.

[0074] In the modified example shown in Figure 3F, by moving the opening and closing pin 71a in the direction of arrow A1, the opening and closing pin 71a moves along the inner wall of the opening and closing guide hole 73L. Within the range of the first locking part 73b of the opening and closing guide hole 73L, as shown by the solid line, the second side hook 70L locks the wire W in a state that does not allow the wire W to move.

[0075] Conversely, when the opening / closing pin 71a moves in the direction of arrow A1 and is located within the locking release portion 73c of the opening / closing guide hole 73L as shown by the two-point chain line, the opening / closing guide hole 73L can be displaced relative to the opening / closing pin 71a to the position shown by the two-point chain line. The second side hook 70L can move relative to the center hook 70C in the direction of departure as shown by arrow H2 by a predetermined amount to prevent the wire W from coming off between the second side hook 70L and the center hook 70C. Furthermore, when the opening / closing pin 71a is located within the locking release portion 73c of the opening / closing guide hole 73L, as the opening / closing pin 71a approaches the second locking portion 73d, the amount of movement of the second side hook 70L in the direction away from the center hook 70C decreases.

[0076] Furthermore, when the opening / closing pin 71a moves in the direction of arrow A1 and the opening / closing pin 71a is located at the second locking part 73d of the opening / closing guide hole 73L as shown by the dotted line, the wire W is locked in a state where the movement of the wire W is not allowed.

[0077] • Example of implementation of the cutting section Figures 4A and 4B are top views showing an example of the cutting portion of this embodiment; Figures 4C to 4E are perspective views showing an example of the cutting portion of this embodiment; Figures 4F and 4G are top views showing a modified example of the cutting portion of this embodiment. Next, an example of the cutting portion of this embodiment will be described with reference to each figure.

[0078] The fixed cutting edge 60 is an example of a cutting edge, and is a cylindrical shape that serves as the axis of rotation for the movable cutting edge 61. It includes an opening 60a that radially extends through the cylindrical shape along the feed path of the wire W. The opening 60a is a shape through which the wire W can pass. In a structure where two wires W are used to bundle the reinforcing bar S, the cross-sectional shape of the opening 60a is an elongated hole shape along the direction in which the two wires W are parallel.

[0079] Preferably, the opening 60a has a tapered shape, for example, where the opening area of ​​the inlet and outlet sides of the opening 60a is enlarged relative to the feeding of the wire W in the positive direction indicated by arrow F. The fixed blade 60 is positioned downstream of the wire guide 4 relative to the feeding direction of the wire W fed in the positive direction.

[0080] In the structure of binding the reinforcing bar S with two wires W, the fixed blade 60 includes a first abutment 60b and a second abutment 60c at the end of the opening 60a exposed on the circumferential surface of the movable blade 61. The fixed blade 60 has multiple abutment portions in the direction in which the multiple wires W are arranged side by side. In this example, along the direction in which the two wires W are arranged side by side, there is a first abutment 60b as one abutment portion and a second abutment 60c as another abutment portion.

[0081] The fixed blade portion 60, relative to the direction of movement of the movable blade portion 61 indicated by arrow D1, has a first abutment portion 60b on its front side and a second abutment portion 60c on its inner side. Between the first abutment portion 60b and the second abutment portion 60c, the fixed blade portion 60 forms a stepped portion 60d that retracts the second abutment portion 60c relative to the direction of movement of the movable blade portion 61 indicated by arrow D1. The amount of retraction is preferably approximately half the diameter of the wire W.

[0082] The fixed blade portion 60 includes a limiting portion 60e, which restricts the wire W that abuts against the first abutting portion 60b from moving toward the second abutting portion 60c. The limiting portion 60e is a plane extending in a direction substantially orthogonal to the direction of movement of the movable blade portion 61 indicated by arrow D1, and is disposed between the first abutting portion 60b and the stepped portion 60d.

[0083] The movable blade 61 is an example of a blade. It is shaped to slide along the circumferential surface of the fixed blade 60. By rotating around the fixed blade 60 as a pivot, it slides into contact with the opening end of the opening 60a of the fixed blade 60.

[0084] The cutting section 6 includes wall portions 62a and 62b that restrict the intrusion of foreign objects. The wall portions 62a and 62b are positioned upstream and downstream of the opening 60a of the fixed blade portion 60, along the trajectory of the rotational movement of the movable blade portion 61. The wall portions 62a and 62b are shaped along the trajectory of the rotational movement of the movable blade portion 61 with the fixed blade portion 60 as a fulcrum, thus preventing waste entering from the opening at the front end of the main body portion 10, and preventing chips generated by friction between the wire W and the reinforcing bar S, from entering around the movable blade portion 61. This suppresses malfunctions of the movable blade portion 61 and reduces the increase in the load required to rotate the movable blade portion 61.

[0085] In the cutting section 6, when the movable blade 61 rotates from its initial position in the direction of arrow D1, the wire W that has passed through the opening 60a of the fixed blade 60 is pressed by the movable blade 61 against the opening end of the opening 60a. Of the two parallel wires W, one wire W is pressed against the end edge of the first abutment portion 60b of the fixed blade 60 by the movement of the movable blade 61, while the other wire W enters the second abutment portion 60c of the fixed blade 60. Thus, a cutting force is applied to one wire W, and the cutting of one wire W begins before the cutting of the other wire W.

[0086] After the first wire W, which is one type of wire, is cut by rotating the movable blade 61 in the direction of arrow D1, when the first wire W is cut to a predetermined position, the second wire W, which is the other type of wire, is pressed against the end edge of the second abutment portion 60c of the fixed blade 60 by the movement of the movable blade 61.

[0087] Thus, the cutting of the second wire W begins. Preferably, the shape and position of the first abutment portion 60b and the second abutment portion 60c are set such that after the cutting of the first wire W begins, the cutting of the second wire W begins when more than half of the first wire W has been cut radially. That is, the distance from the edge of the first abutment portion 60b to the edge of the second abutment portion 60c along the rotation direction of the movable blade portion 61 indicated by arrow D1 is set to approximately half the radial direction of the wire W.

[0088] When the movable blade 61 rotates further toward arrow D1, the cutting of the wire W that started cutting first is completed. Furthermore, when the movable blade 61 rotates further toward arrow D1 to the cutting completion position, the cutting of the other wire W that started cutting is delayed is completed.

[0089] A limiting portion 60e is formed between the first abutting portion 60b and the second abutting portion 60c in the fixed blade portion 60. This limiting portion 60e has a plane extending in a direction substantially orthogonal to the moving direction of the movable blade portion 61 indicated by arrow D1. By having this plane, it is possible to prevent undesirable forces from being applied to the wire W in a direction substantially orthogonal to the moving direction when the movable blade portion 61 moves in the direction indicated by arrow D1.

[0090] Therefore, movement of the wire W, which abuts against the first abutment portion 60b via the movable blade 61, toward the second abutment portion 60c can be suppressed. Furthermore, by suppressing the movement of the wire W toward the second abutment portion 60c, wear on the stepped portion 60d can be suppressed, and the decrease in the distance difference from the end edge of the first abutment portion 60b to the end edge of the second abutment portion 60c along the rotation direction of the movable blade 61 indicated by arrow D1 can be suppressed. Therefore, the phase difference at the start of cutting the two wires W can be ensured, and the increase in load caused by the near-simultaneous start of cutting the two wires W can be suppressed.

[0091] Furthermore, the limiting part 60e can also be configured such that a plane extending in a direction substantially orthogonal to the moving direction of the movable blade 61 indicated by arrow D1 is disposed between the first abutment part 60b and the step part 60d. Alternatively, the limiting part 60e can also be formed by the step part 60d protruding from the first abutment part 60b toward the second abutment part 60c in the opposite direction (arrow D2) to the moving direction of the movable blade 61 indicated by arrow D1.

[0092] Furthermore, as shown in Figure 4F, the limiting portion 60e can also be formed by a protrusion protruding from the first abutment portion 60b and the second abutment portion 60c in the opposite direction (arrow D2) to the movement direction of the movable blade portion 61 indicated by arrow D1. Thus, the first abutment portion 60b becomes concave, which can suppress the movement of the wire W, which abuts against the first abutment portion 60b by the movable blade portion 61, towards the second abutment portion 60c.

[0093] Alternatively, as shown in Figure 4G, the limiting part 60e can also be shaped to separate the first abutting part 60b and the second abutting part 60c. Thus, the first abutting part 60b and the second abutting part 60c are independent, and the wire W that abuts against the first abutting part 60b by the movable blade part 61 is prevented from moving towards the second abutting part 60c.

[0094] • Implementation examples of the transmission section Next, referring to the figures, an example of the transmission unit 9 of this embodiment will be described. The cam 90 of the transmission unit 9 is rotatably supported with a shaft 90a as the fulcrum. The shaft 90a is mounted on a frame 10a, which is installed inside the main body 10. The frame 10a includes a guide portion 10b that restricts the movement direction of the connecting rod 91. The guide portion 10b is formed by an elongated hole that passes through the plate-shaped frame 10a.

[0095] Cam 90 is an example of a displacement component, including a cam groove 92 that provides a length displacement from axis 90a. Cam groove 92 extends radially and circumferentially in the cam 90 centered on axis 90a and intersects with guide portion 10b of frame 10a. Cam groove 92 is connected to guide portion 10b by passing through plate-shaped cam 90, thereby connecting the intersection of cam groove 90 and guide portion 10b.

[0096] The cam 90 changes its position in the cam groove 92 where it intersects with the guide portion 10b by rotating around the shaft 90a, and the length from the shaft 90a to the intersection of the cam groove 92 and the guide portion 10b changes.

[0097] The cam 90, through its rotational movement around the shaft 90a, sets a range where the change in length between the shaft 90a and the cam groove 92 is large or small relative to the same amount of rotation of the cam 90. In this example, this includes a first range 92a where the change in length between the shaft 90a and the cam groove 92 is the largest, a second range 92b where the change in length between the shaft 90a and the cam groove 92 is smaller than the first range 92a, and a third range 92c where the change in length between the shaft 90a and the cam groove 92 is almost negligible.

[0098] The cam 90 rotates in the direction of arrow C1 with the shaft 90a as the fulcrum. During the period when the first range 92a in the cam groove 92 intersects with the guide portion 10b, the length from the shaft 90a to the intersection of the cam groove 92 and the guide portion 10b is shorter than that during the period when the second range 92b intersects with the guide portion 10b, and the change in length between the shaft 90a and the cam groove 92 is greater.

[0099] Furthermore, by rotating about the axis 90a in the direction of arrow C1, the length from the axis 90a to the intersection of the second range 92b and the guide portion 10b in the cam groove 92 is longer than that during the intersection of the first range 92a and the guide portion 10b, and the change in length between the axis 90a and the cam groove 92 is smaller.

[0100] Furthermore, during the rotational motion of the cam 90 in the direction of arrow C1, with the shaft 90a as the fulcrum, the length from the shaft 90a to the intersection of the cam groove 92 and the guide portion 10b during the intersection of the third range 92c and the guide portion 10b is the same as that during the intersection of the second range 92b and the guide portion 10b, and the change in length between the shaft 90a and the cam groove 92 is smaller, remaining approximately constant.

[0101] The cam 90 includes an engaging portion 93 that transmits the movement of the sleeve 71 via the moving member 75. The engaging portion 93 is disposed on the side opposite to the cam groove 92, separated by a shaft 90a, and is positioned on the trajectory of the engaging portion 75a formed by the movement of the moving member 75, which is linked to the forward and backward movement of the sleeve 71 as indicated by arrows A1 and A2. The engaging portion 93 engages with the engaging portion 75a of the moving member 75 by the forward movement of the sleeve 71 as indicated by arrow A1.

[0102] The cam 90, through its rotational movement about the shaft 90a, is forced by the spring 94 in the direction of arrow C2, which intersects the guide portion 10b in the first range 92a of the cam groove 92. The spring 94 is, for example, a torsion coil spring mounted on the shaft 90a. Furthermore, the rotational direction indicated by arrow C2 of the cam 90 corresponds to the direction in which the movable blade portion 61, connected by the connecting rod 91, returns from the cut-off position to the initial position. Considering the possibility that the cam 90 cannot rotate towards arrow C2 due to the force of the spring 94 during the return movement of the movable blade portion 61 from the cut-off position to the initial position, the moving member 75 includes a pressing protrusion 76, and the cam 90 includes a pressed protrusion 96. Before the movable blade portion 61 rotates to the cut-off position, when the moving member 75 moves in the direction of arrow A1 and the cam 90 rotates, the pressing protrusion 76 and the pressed protrusion 96 face each other. Furthermore, by moving the sleeve 71 in the direction of arrow A2, the pressing protrusion 76 pushes the pressed protrusion 96, thereby forcibly starting the rotation of the cam 90 in the direction of arrow C2.

[0103] Link 91 is an example of a transmission component. The forward end, indicated by arrow A1, is connected to the movable blade 61, and the rearward end, indicated by arrow A2, is connected to the cam 90. Link 91 includes a shaft portion 91a, which enters the cam groove 92 of the cam 90 and the guide portion 10b of the frame 10a. The shaft portion 91a consists of a rotating body 91a1 entering the cam groove 92 and a shaft 91a2 that rotatably supports the rotating body 91a1 and does not rotate relative to the link 91 entering the guide portion 10b. It is inserted into the cam groove 92 and the guide portion 10b at the intersection of the cam groove 92 and the guide portion 10b. The shaft portion 91a moves along the cam groove 92 and the guide portion 10b by the rotational action of the cam 90, which is fulcrumped by the shaft 90a. Here, due to the rotational movement of the cam 90 with shaft 90a as the fulcrum, the force applied to the circumferential direction of the rotating body 91a1 by sliding between the cam groove 92 and the rotating body 91a1, and the force applied to the circumferential direction of the shaft 91a2 by sliding between the guide portion 10b and the shaft 91a2, are forces in opposite directions. Therefore, in the shaft portion 91a, the rotating body 91a1 and the shaft 91a2 are composed of different components. Furthermore, the shaft portion 91a may also be configured to include a first rotating body entering the cam groove 92, a second rotating body entering the guide portion 10b, and a shaft that rotatably supports the first and second rotating bodies.

[0104] When the sleeve 71 moves in the forward direction indicated by arrow A1, the moving part 75 moves in conjunction with the sleeve 71 in the forward direction indicated by arrow A1. By moving in the forward direction indicated by arrow A1, the engaging part 75a engages with the engaged part 93 of the cam 90.

[0105] As the moving part 75 moves further forward in the direction indicated by arrow A1, the engaging part 93 is pushed forward, causing the cam 90 to rotate about the shaft 90a in the direction of arrow C1. When the cam 90 rotates in the direction of arrow C1, the location in the cam groove 92 where it intersects with the guide part 10b changes, and the length from the shaft 90a to the intersection of the cam groove 92 and the guide part 10b changes in the increasing direction.

[0106] Therefore, when the cam 90 rotates in the direction of arrow C1, and the shaft portion 91a of the connecting rod 91 moves along the cam groove 92 and the guide portion 10b, the shaft portion 91a moves in a direction away from the shaft 90a of the cam 90.

[0107] When the shaft portion 91a of the connecting rod 91 moves away from the shaft 90a of the cam 90, the transmission unit 9 converts the rotational motion of the cam 90 into movement along the extension direction of the connecting rod 91.

[0108] Therefore, the rotational motion of the cam 90 is transmitted to the movable blade 61 via the connecting rod 91, and the movable blade 61 rotates in the direction of arrow D1. Thus, by the forward movement of the sleeve 71, the movable blade 61 rotates in the predetermined direction, and the wire W is cut.

[0109] In the cam groove 92, the period during which the first range 92a intersects with the guide portion 10b corresponds to the period from the start of rotation of the movable blade portion 61 in the cutting portion 6 to the start of cutting the first wire W. The period from the start of cutting the first wire W corresponds to the region of low load.

[0110] Furthermore, the period during which the second range 92b in the cam groove 92 intersects with the guide portion 10b corresponds to the period from the start of cutting the first wire W to the end of cutting the second wire W during the rotation of the movable blade 61 in the cutting portion 6. This period corresponds to the region of high load. Moreover, the period during which the third range 92c in the cam groove 92 intersects with the guide portion 10b corresponds to the period during which the cutting of the second wire W ends and the rotation of the movable blade 61 stops. Therefore, relative to the amount of movement of the moving member 75, the wire cutting operation and the completed cutter do not require the necessary additional rotation.

[0111] Furthermore, in the above embodiments, the cam 90 is configured such that the length from the first connection point connected to the connecting rod 91, i.e., the intersection of the cam groove 92 and the guide portion 10b, to the shaft 90a is switched by a rotational motion with the shaft 90a as the fulcrum, depending on the shape of the cam groove 92.

[0112] Thus, the cam 90 can switch between the rotation amount (movement amount) of the movable blade 61 and the force that the movable blade 61 can generate within the rotation range (movement range) of the movable blade 61.

[0113] In contrast, the cam 90 can also be configured such that the length from the second connection part connected to the sleeve 71, namely the engaging part 93, to the shaft 90a is switched by a rotational action with the shaft 90a as the fulcrum.

[0114] • Examples of implementation methods for speed reducers Figure 5A is a side sectional view showing an example of the speed reducer of this embodiment; Figure 5B is a perspective view showing an example of the speed reducer of this embodiment; Figure 5C is a side sectional view showing the main part of a modified example of the speed reducer of this embodiment; Figure 5D is a perspective view showing a modified example of the speed reducer of this embodiment. Next, an example of the speed reducer of this embodiment will be described with reference to each figure.

[0115] The reducer 81 is composed of planetary gears with the input shaft and output shaft arranged on the same axis, including: a first sun gear 82a mounted on the shaft 80a of the motor 80 which serves as the input shaft, a first planetary gear 83a meshing with the first sun gear 82a, and a first planetary carrier 84a supporting the first planetary gear 83a.

[0116] Additionally, the reducer 81 includes: a second sun gear 82b disposed on the first planetary carrier 84a, a second planetary gear 83b meshing with the second sun gear 82b, and a second planetary carrier 84b supporting the second planetary gear 83b.

[0117] Furthermore, the reducer 81 includes an internal gear 85 that meshes with the first planetary gear 83a and the second planetary gear 83b.

[0118] The internal gear 85 of the reducer 81 is fixed to the main body 10. Furthermore, the first planetary carrier 84a and the second planetary carrier 84b of the reducer 81 are coaxially arranged with the shaft 80a of the motor 80. Moreover, the second planetary carrier 84b of the reducer 81 is connected to the rotating shaft 72, forming the output shaft.

[0119] The front portion 84f of the second planetary carrier 84b of the reducer 81 protrudes from the internal gear 85 along one axial direction. The front portion 84f of the second planetary carrier 84b protruding from the internal gear 85 is rotatably supported on the main body 10 via a bearing 86.

[0120] Furthermore, the rear side 84r of the second planetary carrier 84b along the axial direction is located inside the internal gear 85, and the rear side 84r is supported by the internal gear 85 by a support member 87. The internal gear 85 is fixed to the main body 10, so the rear side 84r of the second planetary carrier 84b is supported by the main body 10 via the support member 87, which constitutes a sliding bearing, and the internal gear 85. Alternatively, the support member 87 may also be a bearing.

[0121] Additionally, the reducer 81 includes a gear pressing member 88 between the first planetary carrier 84a and the second planetary gear 83b. The gear pressing member 88 is a circular plate-shaped component with a hole in the center for the second sun gear 82b to enter. It is located outside the second sun gear 82b and enters between the first planetary carrier 84a and the second planetary gear 83b to ensure the clearance between the first planetary carrier 84a and the second planetary gear 83b.

[0122] Therefore, the front side portion 84f and the rear side portion 84r of the second planetary carrier 84b along the axial direction are supported on the main body portion 10. Thus, the tilting of the second planetary carrier 84b relative to the axial direction can be suppressed with a simple structure, and the changes in the meshing between the sun gear and the planetary gear, and between the planetary gear and the internal gear can be suppressed; interference between axially arranged gears and between gears and the planetary carrier can be suppressed.

[0123] Alternatively, as in the modified reducer 81 shown in Figures 5C and 5D, a gear pressing member 88a may be integrally included with the first planetary carrier 84a. The gear pressing member 88a, a circular plate-shaped component with a centrally located hole for the second sun gear 82b to enter, is integrally disposed with the first planetary carrier 84a on the outside of the second sun gear 82b. Thus, the gear pressing member 88a, on the outside of the second sun gear 82b, enters between the first planetary carrier 84a and the second planetary gear 83b, ensuring the clearance between them.

[0124] • Example of implementation of the curling forming section Figures 6A to 6D are top views showing an example of the curling forming section of this embodiment. Next, referring to each figure, an example of the curling forming section of this embodiment will be described.

[0125] The curling forming section 5 includes a guide groove 52 that forms a feed path for the wire W in the curling forming section 5, and a first guide member 53a and a second guide member 53b that give the wire W a curling tendency by cooperating with the guide groove 52.

[0126] The first guide member 53a is disposed in the coiling guide member 50 on the inlet side of the wire W fed in the positive direction by the wire feed section 3, and is arranged radially inside the annulus Ru formed by the wire W relative to the feed path of the wire W formed by the guide groove 52. The first guide member 53a restricts the feed path of the wire W so that the wire W fed along the guide groove 52 does not enter the radially inside the annulus Ru formed by the wire W.

[0127] The second guide member 53b is disposed in the coiling guide member 50 on the discharge side of the wire W fed in the positive direction by the wire feed section 3, and is arranged on the radial outer side of the annulus Ru formed by the wire W relative to the feed path of the wire W formed by the guide groove 52.

[0128] The coiling forming section 5 includes a retraction mechanism 54 that retracts the first guide member 53a from the feed path of the wire W. The retraction mechanism 54 is rotatably mounted on the frame 55 that fixes the coiling guide member 50 to the main body section 10 with the shaft 54a as the fulcrum, and is displaced in both the direction in which the first guide member 53a protrudes relative to the feed path of the wire W and in the direction of retraction.

[0129] The retraction mechanism 54 is forced by the force-applying component 56, such as a spring, in the direction that the first guide component 53a protrudes into the feed path of the wire W.

[0130] Additionally, the retraction mechanism 54 includes a guide 57, which displaces the retraction mechanism 54 in a direction relative to the feed path of the first guide member 53a. The guide 57 is composed of an inclined surface, which, during the operation of winding the wire W around the reinforcing bar S, generates a force by being pushed by the wire W, causing the retraction mechanism 54 to displace in a direction relative to the feed path of the wire W.

[0131] Furthermore, the retraction mechanism 54 includes a wire guide portion 58 that forms part of the guide groove 52. When the retraction mechanism 54 moves in a direction protruding from the first guide member 53a relative to the feed path of the wire W, the wire guide portion 58 protrudes into the feed path of the wire W, forming part of the guide groove 52. Additionally, when the retraction mechanism 54 moves in a direction retracting from the first guide member 53a relative to the feed path of the wire W, the wire guide portion 58 protrudes into the feed path of the wire W, blocking the path of the wire W exposed outside the guide groove 52.

[0132] The curling forming section 5 includes a feed restricting section 59 for the front end of the wire W to abut against the wire W in the feed path of the wire W, which is given a curling tendency by the curling guide 50 and guided to the bundling section 7 by the guide guide 51.

[0133] The retraction mechanism 54 includes an opening / closing limiting part 54b, which engages with the moving part 75 linked to the sleeve 71 and contacts the opening / closing limiting part 55a linked to the moving part 75. When the first guide member 53a is moved in a direction protruding relative to the feed path of the wire W, the retraction mechanism 54, through the contact between the opening / closing limiting part 54b and the opening / closing limiting part 55a, restricts rotation about the axis 54a as a fulcrum.

[0134] Furthermore, when the opening / closing limiting member 55a moves in conjunction with the action of the locking member 70 to lock the bundle 7 of the wire W, the opening portion 55b of the opening / closing limiting member 55a moves to a position facing the opening / closing limiting portion 54b of the retraction mechanism 54. The opening / closing limiting portion 54b then enters the opening portion 55b, thereby releasing the restriction on the rotation of the retraction mechanism 54 about the axis 54a. Thus, the retraction mechanism 54 can move in the direction of retraction of the first guide member 53a relative to the feed path of the wire W by rotating about the axis 54a.

[0135] <An example of the operation of the rebar bundling machine in this embodiment> Next, referring to the figures, the operation of the rebar bundling machine 1A of this embodiment for bundling rebar S with wire W will be explained.

[0136] The rebar bundling machine 1A clamps the wire W between a pair of feed gears 30. The front end of the wire W is positioned between the clamping position of the feed gears 30 and the fixed blade 60 of the cutting section 6, which is the standby state. In addition, in the standby state, the sleeve 71 and the first side hook 70R, the second side hook 70L, and the center hook 70C installed on the sleeve 71 move in the rearward direction as shown by arrow A2. As shown in Figure 3A, the first side hook 70R is open relative to the center hook 70C, and the second side hook 70L is open relative to the center hook 70C.

[0137] When the reinforcing bar S enters between the coiling guide 50 and the guide guide 51 of the coiling forming section 5, when the trigger 12 is operated, the feed motor (not shown) is driven in the forward direction, and the wire feed section 3 feeds the wire W in the forward direction indicated by the arrow F.

[0138] In the case of a structure that feeds multiple wires, such as two wires W, the two wires W are fed side by side along the axial direction of the ring Ru formed by the wires W by means of the wire guide 4.

[0139] The wire W, fed in the positive direction, is fed between the center hook 70C and the first side hook 70R to the coiling guide 50 of the coiling forming section 5. As the wire W passes through the coiling guide 50, it is given a tendency to coil around the reinforcing bar S.

[0140] The wire W, which is given a curling tendency by the curling guide 50, is guided by the guide guide 51 and then fed in the positive direction by the wire feed section 3, thereby being guided by the guide guide 51 to the space between the center hook 70C and the second side hook 70L. The wire W is fed until its tip abuts against the feed restriction section 59. When the tip of the wire W is fed to the position abutting against the feed restriction section 59, the drive of the feed motor (not shown) stops.

[0141] After the wire W stops feeding in the positive direction, the motor 80 is driven in the forward direction. In the first operating region where the wire W is stopped by the locking member 70, the sleeve 71 is stopped by the rotation limiting blade 74a, thus restricting the rotation of the sleeve 71, which is linked to the rotation of the rotating shaft 72. Therefore, the rotation of the motor 80 is converted into linear movement, and the sleeve 71 moves forward, i.e., in the direction of arrow A1.

[0142] As the sleeve 71 moves forward in the direction indicated by arrow A1, the locking component 70 moves towards the center hook 70C by rotating around the shaft 71b, according to the trajectory of the opening and closing pin 71a and the shape of the opening and closing guide holes 73R and 73L.

[0143] That is, when the sleeve 71 moves forward in the direction indicated by arrow A1, the inner wall of the first side hook 70R in the opening and closing part 73a formed in the opening and closing guide hole 73R is pushed by the opening and closing pin 71a in the closing direction of the first side hook 70R. As a result, the first side hook 70R rotates about the shaft 71b as a fulcrum and moves in the direction closer to the center hook 70C.

[0144] Furthermore, when the sleeve 71 moves forward in the direction indicated by arrow A1, the inner wall of the second side hook 70L in the opening / closing portion 73a formed in the opening / closing guide hole 73L is pressed by the opening / closing pin 71a in the closing direction of the second side hook 70L. As a result, the second side hook 70L rotates about the shaft 71b as a fulcrum and moves towards the center hook 70C.

[0145] Therefore, the first side hook 70R and the second side hook 70L are closed relative to the center hook 70C.

[0146] When the first side hook 70R is closed relative to the center hook 70C, the wire W sandwiched between the first side hook 70R and the center hook 70C is locked in a manner that allows it to move between the first side hook 70R and the center hook 70C.

[0147] In contrast, when the second side hook 70L is closed relative to the center hook 70C, as shown in Figure 3B, within the range of the locking portion 73b of the opening / closing pin 71a located in the opening / closing guide hole 73L, the wire W sandwiched between the second side hook 70L and the center hook 70C is locked in a manner that prevents it from coming out of the space between the second side hook 70L and the center hook 70C.

[0148] By closing the first side hook 70R and the second side hook 70L, the opening and closing pin 71a is located at the locking part 73b of the opening and closing guide hole 73L. After the sleeve 71 advances to the position of locking the wire W, the rotation of the motor 80 is temporarily stopped, and the feed motor (not shown) is driven in the reverse direction.

[0149] As a result, the pair of feed gears 30 reverse, and the wire W clamped between the pair of feed gears 30 is fed in the opposite direction as indicated by arrow R. Since the front end of the wire W is locked in a way that prevents it from coming off between the second side hook 70L and the center hook 70C, the wire W is wound around the reinforcing bar S by the action of feeding the wire W in the opposite direction.

[0150] In addition, during the action of winding the wire W around the reinforcing bar S, the guide part 57 of the retraction mechanism 54 is pushed by the wire W, and the first guide part 53a retracts relative to the feed path of the wire W.

[0151] After the wire W is wound around the reinforcing bar S and the reverse drive of the feed motor (not shown) is stopped, the sleeve 71 is moved further forward in the direction indicated by arrow A1 by driving the motor 80 in the forward direction.

[0152] Figures 7A to 7G are operational illustrations showing an example of the operation of the binding part, the transmission part, and the cutting part in this embodiment. As shown in Figure 7A, when the sleeve 71 moves in the forward direction indicated by arrow A1, the moving part 75 moves in conjunction with the sleeve 71 in the forward direction indicated by arrow A1.

[0153] As shown in Figure 7B, the moving part 75 moves forward in the direction indicated by arrow A1, and the engaging part 75a engages with the engaged part 93 of the cam 90. The area where the sleeve 71 moves forward in the direction indicated by arrow A1 until the engaging part 75a of the moving part 75 engages with the engaged part 93 of the cam 90 is called the idle area.

[0154] As the moving part 75 moves further forward in the direction indicated by arrow A1, the engaging part 93 is pushed forward, and the cam 90 rotates in the direction of arrow C1 with the shaft 90a as the fulcrum. When the cam 90 rotates in the direction of arrow C1, the position in the cam groove 92 where it intersects with the guide part 10b changes, and the length from the shaft 90a of the cam 90 to the intersection of the cam groove 92 and the guide part 10b changes in the increasing direction.

[0155] At the intersection of the connecting rod 91 and the guide 10b, the shaft 91a is inserted into the cam groove 92 and the guide 10b. The cam 90, with the shaft 90a as the fulcrum, also rotates, and the shaft 91a moves along the cam groove 92 and the guide 10b.

[0156] Therefore, when the cam 90 rotates in the direction of arrow C1, and the length from the shaft 90a of the cam 90 to the intersection of the cam groove 92 and the guide 10b changes in the increasing direction, the shaft 91a of the connecting rod 91 moves along the cam groove 92 and the guide 10b, thereby moving the shaft 91a away from the shaft 90a of the cam 90.

[0157] In the transmission section 9, when the shaft portion 91a of the connecting rod 91 moves away from the shaft 90a of the cam 90, the rotational motion of the cam 90 is converted into movement along the extension direction of the connecting rod 91.

[0158] Thus, the rotational motion of the cam 90 is transmitted to the movable blade 61 via the connecting rod 91, and the movable blade 61 rotates in the direction of arrow D1.

[0159] When the movable blade 61 rotates in the direction of arrow D1, one of the two parallel wires W is pressed against the end edge of the first contact portion 60b of the fixed blade 60 by the movement of the movable blade 61, while the other wire W enters the second contact portion 60c of the fixed blade 60. Thus, the cutting of one wire W begins before the cutting of the other wire W.

[0160] As described above, by rotating the cam 90 in the direction of arrow C1 with the shaft 90a as the fulcrum, the movable blade 61 rotates in the direction of arrow D1. As shown in Figure 7C, the area until the movable blade 61 begins to cut the first wire W is called the idle area. The idling area and the idle area are areas where the load applied to the movable blade 61 is low.

[0161] In the idle area, the first range 92a intersects with the guide portion 10b in the cam groove 92. During the period when the first range 92a intersects with the guide portion 10b in the cam groove 92, the length from the shaft 90a to the intersection of the cam groove 92 and the guide portion 10b is shorter than the period when the second range 92b intersects with the guide portion 10b, and the change in length between the shaft 90a and the cam groove 92 is greater.

[0162] Therefore, the amount of rotation of the movable blade 61 is relatively greater than the amount of movement of the sleeve 71 that rotates the cam 90. On the other hand, in the idle area, since the cutting of the wire W has not yet started, there is no load on the movable blade 61 for cutting the wire, so it is possible to suppress the increase of the load on the cam 90 connected to the movable blade 61 via the connecting rod 91.

[0163] Since the cam 90 is connected to the sleeve 71 via the moving member 75, the increase of the load applied to the cam 90 can be suppressed, thereby suppressing the increase of the load applied to the rotating shaft 72 that moves the sleeve 71 and the motor 80 that is connected to the rotating shaft 72 via the reducer 81.

[0164] Therefore, in the low-load region where the cutting of the first wire W begins, by relatively increasing the rotation amount of the movable blade 61, the time required for the movable blade 61 to rotate to the position where the cutting of the wire W begins can be shortened.

[0165] When the moving part 75 moves forward in the direction indicated by arrow A1 to the position where the movable blade 61 begins to cut the first wire W, as shown in Figure 7D, the cam 90, through its rotational action with the shaft 90a as the fulcrum, intersects the second range 92b and the guide part 10b in the cam groove 92.

[0166] During the period when the second range 92b intersects with the guide portion 10b in the cam groove 92, the length from the shaft 90a of the cam 90 to the intersection of the cam groove 92 and the guide portion 10b changes in an increasing direction, and the shaft portion 91a of the connecting rod 91 moves along the cam groove 92 and the guide portion 10b, thereby moving the shaft portion 91a away from the shaft 90a of the cam 90.

[0167] As a result, the moving part 75 moves further forward in the direction indicated by arrow A1, and the cam 90 rotates in the direction of arrow C1. The rotation of the cam 90 is transmitted to the movable blade 61 via the connecting rod 91. The movable blade 61 rotates further in the direction of arrow D1, thereby initiating the cutting of the first wire W.

[0168] After the first wire W, which is one type of wire, is cut by rotating the movable blade 61 in the direction of arrow D1, when the first wire W is cut to a predetermined position, the second wire W, which is the other type of wire, is pressed against the end edge of the second abutment portion 60c of the fixed blade 60 by the movement of the movable blade 61.

[0169] Therefore, the cutting of the second wire W begins. In this example, after the cutting of the first wire W has begun, the cutting of the second wire W begins when more than half of the radial length of the second wire W has been cut.

[0170] As described above, when the first wire W is cut, during the period when the second range 92b intersects with the guide portion 10b in the cam groove 92, the length from the shaft 90a to the intersection of the cam groove 92 and the guide portion 10b is longer than the period when the first range 92a intersects with the guide portion 10b, and the amount of change in length between the shaft 90a and the cam groove 92 is smaller.

[0171] Therefore, the amount of rotation of the movable blade 61 is relatively smaller relative to the amount of movement of the sleeve 71. On the other hand, by using the cam 90 to move the movable blade 61 via the connecting rod 91, the force that the movable blade 61 can generate is increased.

[0172] When the first wire W is cut, the load applied to the movable blade 61 increases. On the other hand, by increasing the force that the movable blade 61 can generate, the load applied to the movable blade 61 is eliminated, and the increase in the load applied to the cam 90, which is connected to the movable blade 61 via the connecting rod 91, can be suppressed.

[0173] By suppressing the increase in load applied to the cam 90, it is possible to suppress the increase in load applied to the rotating shaft 72 that moves the sleeve 71 and the motor 80 connected to the rotating shaft 72 via the reducer 81.

[0174] When the movable blade 61 rotates in the direction of arrow D1, and the moving part 75 moves from the position where the first wire W is cut to the position where the second wire W is cut in the forward direction indicated by arrow A1, as shown in Figure 7E, the cam 90, through its rotational action with the shaft 90a as the fulcrum, intersects the guide part 10b in the second range 92b of the cam groove 92.

[0175] When the movable blade 61 rotates further toward arrow D1, the cutting of the wire W that started first is completed. And when the movable blade 61 rotates further toward arrow D1, the cutting of the wire W that started later is completed.

[0176] When the movable blade 61 rotates in the direction of arrow D1, and the moving part 75 moves from the position where the second wire W is cut to the position where the second wire W is cut as described above, in the forward direction indicated by arrow A1, as shown in Figure 7F, the cam 90, through its rotational action with the shaft 90a as the fulcrum, intersects the guide part 10b in the second range 92b of the cam groove 92.

[0177] When the cutting of the second wire W begins, the load applied to the movable blade 61 increases further. On the other hand, by increasing the force that the movable blade 61 can generate, the load applied to the movable blade 61 is eliminated, and the increase in the load applied to the cam 90, which is connected to the movable blade 61 via the connecting rod 91, is suppressed.

[0178] By suppressing the increase in load applied to the cam 90, it is possible to suppress the increase in load applied to the rotating shaft 72 that moves the sleeve 71 and the motor 80 connected to the rotating shaft 72 via the reducer 81.

[0179] Therefore, in the high-load region from the start of cutting the first wire W to the end of cutting the second wire W, by increasing the force generated by the movable blade 61, the increase in load applied to the motor 80 can be suppressed. Furthermore, in the high-load region, the rotation amount of the movable blade 61 is relatively small, but in the low-load region, by relatively increasing the rotation amount of the movable blade 61, the time taken until the wire W is completely cut can be suppressed from becoming longer.

[0180] When the moving part 75 moves forward in the direction indicated by arrow A1 to the position where the movable blade 61 ends the cutting of the second wire W, as shown in Figure 7G, the cam 90, through its rotational action with the shaft 90a as the fulcrum, intersects the guide part 10b in the third range 92c of the cam groove 92.

[0181] During the period when the third range 92c intersects with the guide portion 10b in the cam groove 92, the length from the shaft 90a to the intersection point of the cam groove 92 and the guide portion 10b is equal to that during the period when the second range 92b intersects with the guide portion 10b, and the change in length between the shaft 90a and the cam groove 92 is smaller and approximately constant.

[0182] Therefore, the relative rotation of the movable blade 61 is further reduced relative to the movement of the sleeve 71. When the cutting of the wire W is finished, it is not necessary to rotate the movable blade 61. On the other hand, after the wire W is cut, in order to bend the wire W, the sleeve 71 needs to move in the forward direction indicated by arrow A1.

[0183] Therefore, during the period when the third range 92c in the cam groove 92 intersects with the guide portion 10b, the amount of movement relative to the sleeve 71 reduces the amount of rotation of the movable blade portion 61, suppressing the increase in load caused by the rotation of the movable blade portion 61 after the wire W is cut, thereby suppressing the increase in load applied to the cam 90 connected to the movable blade portion 61 via the connecting rod 91.

[0184] Therefore, in the area from the end of the cutting of the second wire W to the stop of the movement of the sleeve 71, by suppressing the increase of the load applied to the cam 90 due to the rotation of the movable blade 61, it is possible to suppress the increase of the load applied to the rotating shaft 72 that moves the sleeve 71 and the motor 80 connected to the rotating shaft 72 via the reducer 81.

[0185] Furthermore, the amount of movement of the sleeve 71 per revolution of the rotating shaft 72 is determined by the lead angle of the feed screw 72a. Therefore, the lead angle of the feed screw 72a is increased compared to conventional rebar bundling machines. On the other hand, in areas with high load applied to the movable blade 61, the rotation amount of the movable blade 61 is relatively less, but the force that the movable blade 61 can generate is increased; in areas with low load applied to the movable blade 61, the rotation amount of the movable blade 61 is relatively increased. As a result, the time spent until the end of wire W cutting can be suppressed, and the time spent on the entire bundling operation can be shortened compared to the past.

[0186] Furthermore, in the operation of cutting a wire W with a circular cross-section, the load is highest near the point where the cutting edge reaches the diameter position before the wire is cut. Therefore, in the structure for cutting two parallel wires W, a phase difference is set for the timing of starting the cutting of wire W. First, after the cutting of the first wire W begins, the cutting of the second wire W begins when this wire W has been cut to more than half of its radial direction.

[0187] Compared to simultaneously cutting two parallel wires W, cutting only one wire W reduces the load. Therefore, by first initiating the cutting of one wire W, the load is reduced. Furthermore, by starting the cutting of the second wire W after the first wire W has been cut to more than half its radial length, passing through the point of maximum load, the load is reduced even when cutting both wires W. Moreover, by starting the cutting of the second wire W before the cutting of the first wire W is completed, the increase in the cutting time can be suppressed.

[0188] Furthermore, by cutting the wire W wound around the reinforcing bar S, the sleeve 71 moves in the forward direction indicated by arrow A1. As shown in Figure 3C, when the opening and closing pin 71a moves to the range of the locking release part 73c located in the opening and closing guide hole 73L, the second side hook 70L can move in a direction away from the center hook 70C by a predetermined amount.

[0189] As described above, during the action of feeding the wire W in the opposite direction and winding it around the reinforcing bar S, the front end of the wire W needs to be locked in a way that prevents it from coming off between the second side hook 70L and the center hook 70C. In contrast, the reaction force of the force by which the second side hook 70L presses the wire W against the center hook 70C is applied to the sleeve 71. This reaction force becomes a load applied to the rotating shaft 72 that moves and rotates the sleeve 71, and to the motor 80 connected to the rotating shaft 72 via the reducer 81.

[0190] Therefore, the second side hook 70L includes a locking part 73b and a locking release part 73c in the opening and closing guide hole 73L. During the operation of winding the wire W into the reinforcing bar S, the sleeve 71 is moved to a position where the opening and closing pin 71a faces the locking part 73b of the opening and closing guide hole 73L. After winding the wire W into the reinforcing bar S, the sleeve 71 is moved to a position where the opening and closing pin 71a faces the locking release part 73c of the opening and closing guide hole 73L.

[0191] Therefore, during the winding of wire W onto the reinforcing bar S, the front end of wire W can be secured without disengaging from between the second side hook 70L and the center hook 70C. Furthermore, after winding wire W onto the reinforcing bar S, the second side hook 70L can move in a direction away from the center hook 70C by a predetermined amount, reducing the reaction force of the force exerted by the second side hook 70L pressing the wire W against the center hook 70C, thus reducing the load applied to the motor 80.

[0192] By driving the motor 80 in the forward direction, the sleeve 71 moves forward in the direction indicated by arrow A1. As described above, approximately simultaneously with cutting the wire W, the bending portions 71c1 and 71c2 move towards the reinforcing bar S. Thus, the bending portion 71c1 presses the front end of the wire W, which is held in place by the center hook 70C and the second side hook 70L, towards the reinforcing bar S, and bends it towards the reinforcing bar S with the holding position as the fulcrum. By further moving the sleeve 71 forward, the wire W, held between the second side hook 70L and the center hook 70C, is maintained in a state clamped by the bending portion 71c1.

[0193] Additionally, the bending portion 71c2 presses the end of the wire W, which is locked by the center hook 70C and the first side hook 70R and cut by the cutting portion 6, toward the rebar S, and bends it toward the rebar S with the locking position as the fulcrum. By moving the sleeve 71 further forward, the wire W, which is locked between the first side hook 70R and the center hook 70C, is held in a state by being clamped by the bending portion 71c2.

[0194] After the front end and the cut end of the wire W are bent toward the reinforcing bar S, the sleeve 71 is further driven in the forward direction by the motor 80. As the sleeve 71 moves to the predetermined position, when it reaches the operating area where the wire W is twisted by the locking member 70, the locking of the rotation limiting blade 74a is released.

[0195] As a result, the sleeve 71 is driven further in the forward direction by the motor 80, and the rotating shaft 72 rotates in conjunction with it, causing the wire W, which is held in place by the locking member 70, to be twisted.

[0196] In the second operating region where the sleeve 71 rotates and twists the wire W, the bundle 7 twists the wire W held in place by the locking member 70, and the sleeve 71 is subjected to a force that stretches forward along the axial direction of the rotation axis 72. Conversely, when a force is applied that moves the sleeve 71 forward along the axial direction, the rotation axis 72 moves forward while being pushed backward by the spring 72c, and twists the wire W while moving forward.

[0197] Therefore, while the locking component 70, sleeve 71, and rotating shaft 72 are subjected to a rearward pushing force from the spring 72c, the wire W moves forward and is twisted. As a result, the gap between the twisted part of the wire W and the reinforcing bar S decreases, so that it is tightly attached to the reinforcing bar S along the reinforcing bar S. This eliminates the slack before twisting the wire W, and the wire W is bundled while being tightly attached to the reinforcing bar S.

[0198] When the load applied to the motor 80 reaches its maximum as detected by twisting the wire W, the forward rotation of the motor 80 is stopped. Next, when the motor 80 is driven in the reverse direction, the rotating shaft 72 rotates in the opposite direction, and the sleeve 71 rotates in the opposite direction following the rotation of the rotating shaft 72, the rotation limiting blade 74a is engaged, thereby limiting the rotation of the sleeve 71, which is linked to the rotation of the rotating shaft 72. As a result, the sleeve 71 moves in the rearward direction, i.e., in the direction of arrow A2.

[0199] When the sleeve 71 moves rearward, the bent portions 71c1 and 71c2 disengage from the wire W, releasing the wire W from their holding. Additionally, as the sleeve 71 moves rearward, the opening / closing pin 71a passes through the opening / closing guide holes 73R and 73L. Consequently, the first side hook 70R moves away from the center hook 70C by rotation about the shaft 71b. Similarly, the second side hook 70L moves away from the center hook 70C by rotation about the shaft 71b. Thus, the wire W disengages from the locking member 70.

[0200] Furthermore, as shown in Figures 3D to 3F, in the modified example of the opening / closing guide hole 73L, by providing a structure in which the opening / closing guide hole 73L includes a second locking portion 73d, when the sleeve 71 moves further forward to a position where the twisting action of the wire W can be performed, the opening / closing pin 71a is located at the second locking portion 73d of the opening / closing guide hole 73L. Therefore, even if a force is applied to twist the wire W, it is possible to prevent the wire W from dislodging from between the second side hook 70L and the center hook 70C.

[0201] • Implementation variations of the transmission department Figures 8A to 8C are side views showing a modified example of the transmission unit of this embodiment, and Figures 9A to 9C are side sectional views showing a modified example of the transmission unit of this embodiment. Next, referring to each figure, the transmission unit 9B of the modified example of this embodiment will be described.

[0202] The transmission unit 9B includes a cutter rod 95 that rotates due to the movement of the binding part 7, and a connecting rod 91 that connects the cutter rod 95 and the movable blade part 61. The transmission unit 9B transmits the movement of the binding part 7 to the movable blade part 61 of the cutting part 6 via the cutter rod 95 and the connecting rod 91.

[0203] The transmission section 9B is supported in such a way that the cutter rod 95 can rotate around the shaft 90b as a fulcrum. The shaft 90b is mounted on the frame 10a, which is installed inside the main body 10.

[0204] The cutter rod 95 is an example of a displacement component, including a first cutter rod 95a and a second cutter rod 95b connected to the sleeve 71 via the moving member 75. The first cutter rod 95a engages with a first engaging portion 75b provided on the moving member 75, and the second cutter rod 95b engages with a second engaging portion 75c provided on the moving member 75.

[0205] The cutter rod 95, serving as a second connection point to the sleeve 71, has a different length from the point of application of the moving part 75 (which is linked to the sleeve 71) to the shaft 90b compared to the first cutter rod 95a and the second cutter rod 95b. The length from the shaft 90b to the point of application of the moving part 75 is such that the second cutter rod 95b is longer than the first cutter rod 95a.

[0206] That is, the length from the point of action of the movable member 75 pressing in the second cutter rod 95b, i.e. the second engaging part 75c, to the shaft 90b is longer than the length from the point of action of the movable member 75 pressing in the first cutter rod 95a, i.e. the first engaging part 75b, to the shaft 90b.

[0207] When the moving part 75 moves forward in conjunction with the sleeve 71, which moves in the forward direction as indicated by arrow A1, the first engaging part 75b engages with the first cutter rod 95a. As the sleeve 71 moves further forward in the forward direction as indicated by arrow A1, the second engaging part 75c engages with the second cutter rod 95b. Furthermore, the engagement between the first cutter rod 95a and the first engaging part 75b is released.

[0208] The forward end of the connecting rod 91, indicated by arrow A1, is connected to the movable blade 61, and the rearward end, indicated by arrow A2, is connected to the cutter rod 95.

[0209] Next, the operation of the transmission unit 9B will be explained. When the sleeve 71 moves in the forward direction indicated by arrow A1, the moving part 75 moves in conjunction with the sleeve 71 in the forward direction indicated by arrow A1. By moving in the forward direction indicated by arrow A1, the first engaging part 75b engages with the first cutter rod 95a, as shown in Figure 9B.

[0210] As the moving part 75 moves further in the forward direction indicated by arrow A1, relative to the amount of movement of the sleeve 71, the cutter rod 95 rotates in the direction of arrow C1 with the shaft 90b as the fulcrum, in a ratio corresponding to the length from the shaft 90b to the point of action of the first engaging part 75b of the moving part 75 in the first cutter rod 95a2.

[0211] By rotating the cutter rod 95 in the direction of arrow C1, the rotational motion of the cutter rod 95 is transmitted to the movable blade 61 via the connecting rod 91, and the movable blade 61 rotates in the direction of arrow D1. Therefore, by moving the sleeve 71 forward, the movable blade 61 rotates in the direction of arrow D1, and the cutting of the wire W begins.

[0212] As the sleeve 71 moves further in the forward direction indicated by arrow A1, as shown in Figure 8C, the second engaging portion 75c of the moving member 75 engages with the second cutter rod 95b. Consequently, relative to the amount of movement of the sleeve 71, the cutter rod 95 rotates about the shaft 90b as a fulcrum in the direction of arrow C1, with a ratio corresponding to the length from the shaft 90b to the point of action where the second engaging portion 75c of the moving member 75 pushes the second cutter rod 95b. Meanwhile, the engagement between the first cutter rod 95a and the first engaging portion 75b is released.

[0213] The period during which the first cutter rod 95a engages with the first engaging part 75b is from the start of rotation of the movable blade 61 in the cutting part 6 to the start of cutting the first wire W. Furthermore, the period during which the second cutter rod 95b engages with the second engaging part 75c is from the start of cutting the first wire W to the end of cutting the second wire W, during the period of further rotation of the movable blade 61 in the cutting part 6.

[0214] In the cutter rod 95, the length from the shaft 90b to the point of action where the movable part 75 pushes is configured such that the second cutter rod 95b is longer than the first cutter rod 95a. As a result, during the engagement of the first cutter rod 95a with the first engaging part 75b, the rotation of the movable blade 61 is relatively greater than the movement of the sleeve 71 that rotates the cutter rod 95.

[0215] On the other hand, during the period when the first cutter bar 95a is engaged with the first engaging portion 75b, since the cutting of the wire W has not yet begun, it is possible to suppress the increase of the load applied to the movable blade portion 61 and suppress the increase of the load applied to the cutter bar 95 connected to the movable blade portion 61 via the connecting rod 91.

[0216] Since the cutter rod 95 is connected to the sleeve 71 via the moving part 75, by suppressing the increase of the load applied to the cutter rod 95, it is possible to suppress the increase of the load applied to the rotating shaft 72 that moves the sleeve 71 and the motor 80 that is connected to the rotating shaft 72 via the reducer 81.

[0217] Therefore, in the low-load region before the first wire W is cut, by relatively increasing the rotation of the movable blade 61, the time required for the movable blade 61 to rotate to the position where the wire W is cut can be shortened.

[0218] During the engagement of the second cutter rod 95b with the second engaging portion 75c, the rotation of the movable blade portion 61 is relatively smaller relative to the movement of the sleeve 71 that rotates the cutter rod 95. On the other hand, the length from the shaft 90b to the point of action of the moving member 75 is configured such that the second cutter rod 95b is longer than the first cutter rod 95a, thus increasing the force that the movable blade portion 61 can generate from the cutter rod 95 via the connecting rod 91.

[0219] When the first wire W is cut, the load applied to the movable blade 61 increases. On the other hand, by increasing the force that the movable blade 61 can generate, the load applied to the movable blade 61 is eliminated, and the increase in the load applied to the cutter rod 95, which is connected to the movable blade 61 via the connecting rod 91, is suppressed.

[0220] By suppressing the increase in load applied to the cutter rod 95, the increase in load applied to the rotating shaft 72 that moves the sleeve 71 and the motor 80 connected to the rotating shaft 72 via the reducer 81 is also suppressed.

[0221] Therefore, in the high-load region from the start of cutting the first wire W to the end of cutting the second wire W, by increasing the force generated by the movable blade 61, the increase in load applied to the motor 80 can be suppressed. Furthermore, in the high-load region, the rotation amount of the movable blade 61 is relatively small, but in the low-load region, by relatively increasing the rotation amount of the movable blade 61, the time taken until the wire W is completely cut can be suppressed from becoming longer.

[0222] Furthermore, in the above embodiments, the structure is as follows: by rotating the cutter rod 95 with the shaft 90b as the fulcrum, the first engaging part 75b of the moving part 75 engages with the first cutter rod 95a, or the second engaging part 75c of the moving part 75 engages with the second cutter rod 95b. Thus, the length of the cutter rod 95 from the shaft 90b to the first connecting part connected to the sleeve 71 can be switched.

[0223] Therefore, the cutter rod 95 can switch the amount of rotation (movement) of the movable blade 61 and the force that the movable blade 61 can generate within the rotation range (movement range) of the movable blade 61.

[0224] In contrast, the cutter rod 95 can also be configured to switch the part connected to the connecting rod 91 by rotating around the shaft 90b, thereby switching the length from the shaft 90b to the second connection part connected to the connecting rod 91.

[0225] 1A: Rebar Bundling Machine 10: Main body 10a: Framework 10b: Guiding Section 11: Grip section 12: Trigger 13: Switch 14: Control Department 15: Battery 2: Box 20: Reel 3: Wire Feed Section 30: Feed gear 4: Wire guide 5: Curl Formation Section 50: Curved Guide 51: Guide components 52: Guide groove 53a: First guiding component 53b: Second guide component 54: Retreat Agency 54a: Shaft 54b: Opening and closing restriction section 55: Framework 55a: Opening and closing limiting component 55b: Opening 56: Force-applying components 57: Guidance Department 58: Wire guide section 59: Feed Restriction Section 6: Cut-off section 60: Fixed blade (edge ​​section) 60a: Opening 60b: First abutment (one abutment) 60c: Second abutment (another abutment) 60d: Stepped section 60e: Restriction Section 61: Movable blade (edge ​​section) 62a, 62b: Wall portion 7: Binding section 70: Locking component 70R: First side hook 70L: Second side hook 70C: Center Hook 71: Sleeve 71a: Opening and closing pins 71b: Shaft 71c1, 71c2: Bending section 72: Rotation axis 72a: Feed screw 72c: Spring 73R, 73L: Opening / closing guide hole 73a: Opening and closing part 73b: Locking part, first locking part 73c: Lock Release Section 73d: Second locking part 74: Rotation limiting part 74a: Rotation limiting blade 75: Moving parts 75a: Card-connecting part 75b: First card part 75c: Second card part 8: Drive Unit 80: Motor 80a: Shaft 81: Gearbox 82a: First Sun Gear 82b: Second Sun Gear 83a: First Planetary Gear 83b: Second Planetary Gear 84a: First Planetary Carrier 84b: Second Planetary Carrier 84f: Front side 84r: Rear side 85: Internal Gear 86: Bearing 87: Support components 88: Gear pressing component 9,9B: Transmission Section 90: Cam (displacement component) 90a, 90b: Shaft 91: Linkage (transmission component) 91a: Shaft 91a1: Rotational body 91a2: Shaft 92: Cam groove 92a: First Range 92b: Second Range 92c: Third Range 93: The part that was stuck 95: Cutter rod (displacement component) 95a: First cutter rod 95b: Second cutter rod A1, A2, C1, C2, D1, D2, F, H1, H2, R: Arrows Ru: Ring S: Reinforcing steel W: Wire

Claims

1. A bundling machine, comprising: The device comprises: a wire feeding section for feeding wire; a coiling forming section for forming a path for winding the wire fed by the wire feeding section around a bundle; a cutting section for cutting the wire wound around the bundle; and a bundling section for twisting the wire wound around the bundle and cut by the cutting section. The bundling section includes a locking member, which includes a first hook and a second hook, and locks the wire by moving the first hook toward the second hook. The locking member includes: a locking part that locks the wire while the first hook is moved toward the second hook; and a locking release part that moves the first hook away from the second hook by an amount of movement that prevents the locked wire from coming off between the first hook and the second hook.

2. The bundling machine as described in claim 1, wherein, The locking member locks the wire when the wire is fed in the opposite direction by the wire feeder and the wire is wound around the bundle. The locking member locks the wire while the first hook is moving toward the second hook. The locking member can also lock the wire when the wire wound around the bundle is cut by the cutting member and when the wire cut by the cutting member is twisted by the bundle. The locking release member can then move the first hook away from the second hook.

3. The bundling machine as described in claim 1, wherein, The locking component includes: a first locking part that locks the wire when the wire is fed in the opposite direction by the wire feed part and the wire is wound around the bundle, and when the first hook has moved toward the direction of the second hook; and a second locking part that locks the wire when the wire cut by the cutting part is twisted by the bundle part, and when the first hook has moved toward the direction of the second hook.

4. The bundling machine as described in claim 1, wherein, The binding portion includes a sleeve, the sleeve including an opening and closing pin and movable to actuate the locking member, the first hook including a guide hole for insertion of the opening and closing pin and extending along the moving direction of the sleeve, the locking portion being formed by a first portion of the wall of the guide hole facing the opening and closing pin, and the locking release portion being formed by a second portion of the wall of the guide hole facing the opening and closing pin.

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