End Machine

Abstract

To provide a binding machine which can optimize a moving amount (moving speed) per unit time of a movable blade that cuts wires and a force that can be generated by the movable blade according to a load applied to the movable blade.SOLUTION: A rebar binding machine 1A comprises a cutting part 6 for cutting a wire W wound around a rebar S, a binding part 7 for twisting the wire W, and a transmission part 9 for transmitting the movement of the binding part 7 to the cutting part 6. The binding part 7 includes a sleeve 71 that operates a locking member 70 that locks the wire W, and a rotating shaft 72 that operates the sleeve 71, the transmission unit 9 includes a cam 90 that is displaced by the movement of the sleeve 71 and a link 91 that transmits the movement of the cam 90 to the cutting part 6, the cutting part 6 has a movable blade part 61 connected to the link 91, and the cam 90 switches the amount of movement of the movable blade part 61 and the force that the movable blade part 61 can generate within the movement range of the movable blade part 61 .SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

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

[0003] BACKGROUND ART Conventionally, a binding machine known as a reinforcing bar binding machine has been proposed, which binds two or more reinforcing bars with wire by winding wire around the reinforcing bars and twisting the wire wound around the reinforcing bars.

[0004] The rebar tying machine includes a wire feeding unit that feeds the wire, a curl forming unit that forms a path for winding the wire around the object to be tied, a cutting unit that cuts the wire, and a tying unit that twists the wire.The rebar tying machine also includes a transmission unit that transmits the movement of the tying unit to the cutting unit, as the tying unit and the cutting unit are driven by a common drive unit.

[0005] The bundling unit includes a pair of side hooks that fasten the wire and a sleeve that opens and closes the side hooks. The sleeve utilizes a feed screw and opens and closes the side hooks by moving in the axial direction of a rotation shaft driven by a drive unit. The cutting unit cuts the wire by transmitting the movement of the sleeve to a movable blade unit via a transmission unit (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2018-109298 Summary of the Invention [Problem to be solved by the invention]

[0007] In conventional rebar tying machines, the transmission unit includes a first link that rotates when the movement of the sleeve is transmitted, and a second link that transmits the rotation of the first link to the movable blade unit. In the transmission unit, the distance between the axis that serves as the rotation fulcrum of the first link and the axis that connects the first link and the second link is constant, and the leverage ratio that moves the movable blade unit is approximately constant within the movement range of the movable blade unit.

[0008] For this reason, conventionally, within the movement range of the movable blade section, the movement amount (movement speed) per unit time of the movable blade section is approximately constant relative to the movement amount (movement speed) per unit time of the sleeve, and the force that can be generated by the movable blade section is also approximately constant.

[0009] In a rebar tying machine, within the range of movement of the movable blade, the load on the movable blade is low and the load on the motor that drives the movable blade is also low until the wire cutting begins. In contrast, once the wire cutting begins, the load on the movable blade increases and the load on the motor that drives the movable blade also increases. However, with conventional rebar tying machines, it was not possible to optimize the amount of movement per unit time (movement speed) of the movable blade within its range of movement and the force that the movable blade can generate to match the load on the movable blade.

[0010] The present invention has been made to solve such problems, and aims to provide a binding machine that can optimize the movement amount per unit time (movement speed) of the movable blade that cuts the wire and the force that can be generated by the movable blade to match the load applied to the movable blade. [Means for solving the problem]

[0011] In order to solve the above-mentioned problems, the present invention provides a wire curling machine comprising a wire feeding section for feeding a wire, a curl forming section that forms a path for winding the wire fed by the wire feeding section around a bundled object, a cutting section that cuts the wire wound around the bundled object, a bundling section that twists the wire wound around the bundled object and cut by the cutting section, and a transmission section that transmits the movement of the bundling section to the cutting section, wherein the bundling section comprises a locking member that locks the wire, a sleeve that actuates the locking member, and a rotating shaft that actuates the sleeve, and the transmission section comprises a displacement member that is displaced by the movement of the sleeve and a transmission member that transmits the movement of the displacement member to the cutting section, and the cutting section comprises a movable blade section connected to the transmission member, and the displacement member comprises The shaft rotates around the fulcrum, and the length from the shaft to the first connecting portion that is connected to the transmission member or the length from the shaft to the second connecting portion that is connected to the sleeve is switched by the rotational movement around the shaft; This binding machine switches the amount of movement of the movable blade and the force that the movable blade can generate within the range of movement of the movable blade.

[0012] The present invention also provides a wire curling machine comprising a wire feeding section that feeds the wire, a curl forming section that forms a path for winding the wire fed by the wire feeding section around a material to be bundled, a cutting section that cuts the wire wound around the material to be bundled, a bundling section that twists the wire wound around the material to be bundled and cut by the cutting section, and a transmission section that transmits the movement of the bundling section to the cutting section, wherein the bundling section comprises a locking member that locks the wire, a sleeve that actuates the locking member, and a rotating shaft that actuates the sleeve, and the transmission section comprises a displacement member that is displaced by the movement of the sleeve and a transmission member that transmits the movement of the displacement member to the cutting section, and the cutting section comprises a movable blade section connected to the transmission member, and the displacement member The shaft rotates around the fulcrum, and the length from the shaft to the first connecting portion that is connected to the transmission member or the length from the shaft to the second connecting portion that is connected to the sleeve is switched by the rotational movement around the shaft; This is a binding machine in which the movement amount of the movable blade relative to the movement amount of the sleeve is switched within the movement range of the movable blade.

[0013] In the present invention, the amount of movement of the movable blade is increased in a region within the movement range of the movable blade where a force that the movable blade may generate is not required, whereas in a region where a force that the movable blade may generate is required, the amount of movement of the movable blade is decreased but the force that the movable blade may generate is increased. [Effects of the Invention]

[0014] According to the present invention, the movement amount per unit time (movement speed) of the movable blade that cuts the wire and the force that the movable blade can generate can be optimized in accordance with the load applied to the movable blade. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a diagram showing an internal configuration of an example of the overall configuration of a reinforcing bar binding machine according to an embodiment of the present invention, viewed from the side. [Figure 2A] 1 is a side view showing an internal configuration of an example of a main configuration of a reinforcing bar binding machine according to an embodiment of the present invention. FIG. [Figure 2B] 1 is a side view showing an internal configuration of an example of a main configuration of a reinforcing bar binding machine according to an embodiment of the present invention. FIG. [Figure 2C] 1 is a side view showing an internal configuration of an example of a main configuration of a reinforcing bar binding machine according to an embodiment of the present invention. FIG. [Figure 3A] FIG. 2 is a plan view showing an example of a binding portion of the present embodiment. [Figure 3B] FIG. 2 is a plan view showing an example of a binding portion of the present embodiment. [Figure 3C] FIG. 2 is a plan view showing an example of a binding portion of the present embodiment. [Figure 3D] FIG. 10 is a plan view of a main part showing a modified example of the binding part of the present embodiment. [Figure 3E] FIG. 10 is a plan view of a main portion showing a modified example of the binding portion of the present embodiment. [Figure 3F] FIG. 10 is a plan view of a main portion showing a modified example of the binding portion of the present embodiment. [Figure 4A] FIG. 2 is a plan view showing an example of a cutting section according to the present embodiment. [Figure 4B] FIG. 2 is a plan view showing an example of a cutting section according to the present embodiment. [Figure 4C] FIG. 2 is a perspective view showing an example of a cutting section according to the present embodiment. [Figure 4D] FIG. 2 is a perspective view showing an example of a cutting section according to the present embodiment. [Figure 4E] FIG. 2 is a perspective view showing an example of a cutting section according to the present embodiment. [Figure 4F] FIG. 10 is a plan view showing a modified example of the cutting portion of the present embodiment. [Figure 4G] FIG. 10 is a plan view showing a modified example of the cutting portion of the present embodiment. [Figure 5A] 1 is a side cross-sectional view showing an example of a reducer according to an embodiment of the present invention. [Figure 5B] 1 is a perspective view showing an example of a reducer according to an embodiment of the present invention; [Figure 5C] FIG. 10 is a side cross-sectional view of a main portion showing a modified example of the reducer of the present embodiment. [Figure 5D] FIG. 10 is a perspective view showing a modified example of the reducer of the present embodiment. [Figure 6A] FIG. 2 is a plan view illustrating an example of a curl forming unit according to the present embodiment. [Figure 6B] FIG. 2 is a plan view illustrating an example of a curl forming unit according to the present embodiment. [Figure 6C] FIG. 2 is a plan view illustrating an example of a curl forming unit according to the present embodiment. [Figure 6D] FIG. 2 is a plan view illustrating an example of a curl forming unit according to the present embodiment. [Figure 7A] 10A and 10B are explanatory diagrams showing an example of the operations of the binding unit, the transmission unit, and the cutting unit of the present embodiment. [Figure 7B] 10A and 10B are explanatory diagrams showing an example of the operations of the binding unit, the transmission unit, and the cutting unit of the present embodiment. [Figure 7C] 10A and 10B are explanatory diagrams showing an example of the operations of the binding unit, the transmission unit, and the cutting unit of the present embodiment. [Figure 7D] 10A and 10B are explanatory diagrams showing an example of the operations of the binding unit, the transmission unit, and the cutting unit of the present embodiment. [Figure 7E] 10A and 10B are explanatory diagrams showing an example of the operations of the binding unit, the transmission unit, and the cutting unit of the present embodiment. [Figure 7F] 10A and 10B are explanatory diagrams showing an example of the operations of the binding unit, the transmission unit, and the cutting unit of the present embodiment. [Figure 7G] 10A and 10B are explanatory diagrams showing an example of the operations of the binding unit, the transmission unit, and the cutting unit of the present embodiment. [Figure 8A] FIG. 10 is a side view showing a modified example of the transmission unit of the present embodiment. [Figure 8B] FIG. 10 is a side view showing a modified example of the transmission unit of the present embodiment. [Figure 8C] FIG. 10 is a side view showing a modified example of the transmission unit of the present embodiment. [Figure 9A] FIG. 10 is a side cross-sectional view showing a modified example of the transmission portion of the present embodiment. [Figure 9B] FIG. 10 is a side cross-sectional view showing a modified example of the transmission portion of the present embodiment. [Figure 9C] FIG. 10 is a side cross-sectional view showing a modified example of the transmission portion of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an example of a reinforcing bar binding machine as an embodiment of the binding machine of the present invention will be described with reference to the drawings.

[0017] <Example of overall configuration of reinforcing bar binding machine according to this embodiment> FIG. 1 is a diagram showing an internal configuration seen from the side, illustrating an example of the overall configuration of a reinforcing bar binding machine according to this embodiment.

[0018] The rebar binding machine 1A feeds the wire W in the forward direction indicated by the arrow F, winding it around the rebar S to be bound, and then feeds the wire W wound around the rebar S in the reverse direction indicated by the arrow R, winding it around the rebar S and cutting it, and then twists the wire W and binds the rebar S with the wire W.

[0019] To achieve the above-mentioned functions, the rebar binding machine 1A is equipped with a magazine 2 that stores the wire W, a wire feeding unit 3 that feeds the wire W, and a wire guide 4 that guides the wire W. The rebar binding machine 1A also has a curl forming unit 5 that forms a path for winding the wire W fed by the wire feeding unit 3 around the rebar S, and a cutting unit 6 that cuts the wire W wound around the rebar S. The rebar binding machine 1A is further equipped with a binding unit 7 that twists the wire W wound around the rebar S, a drive unit 8 that drives the binding unit 7, and a transmission unit 9 that transmits the operation of the binding unit 7 to the cutting unit 6.

[0020] The reinforcing bar binding machine 1A is designed to be held by the operator and includes a main body 10 and a handle 11.

[0021] The magazine 2 is an example of a storage section, and rotatably and detachably stores a reel 20 around which a long wire W is wound so as to be able to be unwound. The wire W is a wire made of a metal wire that can be plastically deformed, a metal wire coated with resin, or a twisted wire.

[0022] In a configuration in which reinforcing bars S are bound with one wire W, the single wire W is wound around a hub portion (not shown) of the reel 20, and the single wire W can be pulled out as the reel 20 rotates. In a configuration in which reinforcing bars S are bound with multiple wires W, the multiple wires W are wound around the hub portion, and the multiple wires W can be pulled out simultaneously as the reel 20 rotates. For example, in a configuration in which reinforcing bars S are bound with two wires W, the two wires W are wound around the hub portion, and the two wires W can be pulled out simultaneously as the reel 20 rotates.

[0023] The wire feeding unit 3 includes a pair of feed gears 30 that sandwich and feed the wire W. The rotation of a feed motor (not shown) is transmitted to the wire feeding unit 3, causing the feed gear 30 to rotate. As a result, the wire feeding unit 3 feeds the wire W sandwiched between the pair of feed gears 30 along the extension direction of the wire W. In a configuration in which multiple pieces of wire W, for example, two pieces of wire W, are fed to bind the reinforcing bars S, the two pieces of wire W are fed in a parallel state.

[0024] The wire feed unit 3 switches the rotation direction of the feed motor (not shown) between forward and reverse, thereby switching the rotation direction of the feed gear 30 and switching the feed direction of the wire W between forward and reverse, either feeding the wire W in the forward direction indicated by arrow F or feeding the wire W in the reverse direction indicated by arrow R.

[0025] The wire guides 4 are provided at predetermined positions upstream and downstream of the wire feeding unit 3 with respect to the feeding direction in which the wire W is fed in the forward direction. In a configuration in which two wires W are fed to bind reinforcing bars S, the wire guide 4 provided upstream of the wire feeding unit 3 regulates the radial orientation of the two wires W, aligns the two incoming wires W in parallel, and guides them between a pair of feed gears 30. The wire guide 4 provided downstream of the wire feeding unit 3 regulates the radial orientation of the two wires W, aligns the two incoming wires W in parallel, and guides them to the cutting unit 6 and the curl forming unit 5.

[0026] The curl forming unit 5 includes a curl guide 50 that curls the wire W fed by the wire feeding unit 3, and an guiding guide 51 that guides the wire W curled by the curl guide 50 to the bundling unit 7. In the rebar bundling machine 1A, the path of the wire W fed by the wire feeding unit 3 is regulated by the curl forming unit 5, so that the trajectory of the wire W forms a loop Ru as shown by the two-dot chain line in Figure 1, and the wire W is wound around the rebar S.

[0027] In the reinforcing bar binding machine 1A, the curl guide 50 and the induction guide 51 of the curl forming unit 5 are provided at the front end of the main body 10.

[0028] The cutting unit 6 includes a fixed blade unit 60 and a movable blade unit 61 that cuts the wire W in cooperation with the fixed blade unit 60. The cutting unit 6 cuts the wire W by the rotational movement of the movable blade unit 61 with the fixed blade unit 60 as the fulcrum axis. In this specification, the cutting unit 6 is described as the fixed blade unit 60 and the movable blade unit 61 that rotates with the fixed blade unit 60 as the fulcrum axis, but the movable blade unit 61 may be a sliding type that slides linearly rather than rotating.

[0029] The transmission unit 9 includes a cam 90 that rotates with the operation of the binding unit 7, and a link 91 that connects the cam 90 to the movable blade unit 61. The transmission unit 9 transmits the operation of the binding unit 7 to the movable blade unit 61 of the cutting unit 6 via the cam 90 and the link 91.

[0030] The binding unit 7 includes a locking member 70 that locks the wire W, and a sleeve 71 that operates the locking member 70. The driving unit 8 includes a motor 80 and a reducer 81 that reduces speed and amplifies torque.

[0031] When the bundling unit 7 is driven by the drive unit 8, the sleeve 71 activates the locking member 70 to lock the wire W. After the cutting unit 6 cuts the wire W in conjunction with the operation of the sleeve 71, the bundling unit 7 twists the wire W to bind the reinforcing bar S.

[0032] In the rebar tying machine 1A, the wire feeding unit 3, wire guide 4, cutting unit 6, binding unit 7, drive unit 8, transmission unit 9, etc. are housed inside a main body 10. In the rebar tying machine 1A, the binding unit 7 is provided inside the front side of the main body 10, and the drive unit 8 is provided inside the rear side. In addition, in the rebar tying machine 1A, an abutting unit 16 against which the rebar S abuts is provided at the front end of the main body 10, between the curl guide 50 and the induction guide 51.

[0033] Furthermore, in the rebar binding machine 1A, a handle portion 11 extends downward from the main body portion 10, and a battery 15 is detachably attached to the lower portion of the handle portion 11. In addition, in the rebar binding machine 1A, a magazine 2 is provided in front of the handle portion 11.

[0034] The rebar tying machine 1A has a trigger 12 provided on the front side of a handle portion 11, and a switch 13 provided inside the handle portion 11. In the rebar tying machine 1A, a control unit 14 controls a motor 80 and a feed motor (not shown) according to the state of the switch 13 pressed by operating the trigger 12.

[0035] <Example of main configuration of reinforcing bar binding machine according to this embodiment> 2A to 2C are side views of the internal configuration of an example of the main configuration of a reinforcing bar binding machine of this embodiment, with Fig. 2A mainly showing the binding unit 7, cutting unit 6, and transmission unit 9, Fig. 2B is a cross-sectional view of the cutting unit 6 and transmission unit 9 in Fig. 2A, and Fig. 2C is a view showing the internal configuration with the outline of sleeve 71 in Fig. 2A indicated by a two-dot chain line. Also, Figs. 3A to 3C are plan views showing an example of the binding unit of this embodiment, and Figs. 3D to 3F are plan views of the main part showing modified examples of the binding unit of this embodiment.

[0036] Example of binding part Next, an example of the binding unit of this embodiment will be described with reference to the drawings. The binding unit 7 includes a rotating shaft 72 that moves and rotates a sleeve 71 to operate the locking member 70. The binding unit 7 and the drive unit 8 are configured such that the rotating shaft 72 and a motor 80 are connected via a reducer 81, and the rotating shaft 72 is driven by the motor 80 via the reducer 81.

[0037] The locking member 70 includes a center hook 70C connected to a rotary shaft 72, and a first side hook 70R and a second side hook 70L that open and close relative to the center hook 70C.

[0038] In the binding part 7, the side where the center hook 70C, the first side hook 70R, and the second side hook 70L are provided is the front side, and the side where the rotation shaft 72 is connected to the reducer 81 is the rear side.

[0039] The center hook 70C is connected to the front end, which is one end of the rotating shaft 72, via a configuration that allows it to rotate relative to the rotating shaft 72, rotate integrally with the rotating shaft 72, and move axially integrally with the rotating shaft 72.

[0040] The first side hook 70R has a tip end, which is one end along the axial direction of the rotating shaft 72, located on one side of the center hook 70C. The first side hook 70R has a rear end, which is the other end along the axial direction of the rotating shaft 72, rotatably supported by the center hook 70C via a shaft 71b.

[0041] The second side hook 70L has a tip end, which is one end along the axial direction of the rotation shaft 72, located on the other side of the center hook 70C. The second side hook 70L has a rear end, which is the other end along the axial direction of the rotation shaft 72, rotatably supported by the center hook 70C via a shaft 71b.

[0042] As a result, the locking member 70 rotates about the shaft 71b, opening and closing the tip of the first side hook 70R in the direction of moving toward and away from the center hook 70C. Also, the tip of the second side hook 70L opens and closes in the direction of moving toward and away from the center hook 70C.

[0043] The rotating shaft 72 is rotatable integrally with the reducer 81, and has a rear end connected to the other end thereof via a connecting portion 72b configured to be movable in the axial direction relative to the reducer 81. The connecting portion 72b is provided with a spring 72c that urges the rotating shaft 72 rearward, i.e., toward the reducer 81, and restricts the position of the rotating shaft 72 along the axial direction. As a result, the rotating shaft 72 is configured to be movable forward, i.e., in a direction away from the reducer 81, while receiving a force pushing it rearward by the spring 72c. Therefore, the rotating shaft 72 and the locking member 70 connected to the rotating shaft 72 are movable forward up to a predetermined amount defined by the connecting portion 72b, while receiving a force pushing it rearward by the spring 72c.

[0044] The sleeve 71 has a shape that is divided into two radially over a predetermined length range along the axial direction of the rotating shaft 72 from the front end indicated by arrow A1, and is shaped to accommodate the first side hook 70R and the second side hook 70L. The sleeve 71 is cylindrical and covers the periphery of the rotating shaft 72, and has a convex portion (not shown) that protrudes from the inner circumferential surface of the cylindrical space into which the rotating shaft 72 is inserted, and this convex portion fits into a groove of a feed screw 72a formed on the outer periphery of the rotating shaft 72 along the axial direction.

[0045] When the rotary shaft 72 rotates, the sleeve 71 moves in the front-to-rear direction, which is the direction along the axial direction of the rotary shaft 72, according to the rotation direction of the rotary shaft 72 due to the action of a convex portion (not shown) and the feed screw 72a of the rotary shaft 72. When the sleeve 71 moves along the axial direction of the rotary shaft 72 to the front end of the feed screw 72a, it rotates integrally with the rotary shaft 72.

[0046] The sleeve 71 has an opening / closing pin 71a that opens and closes the first side hook 70R and the second side hook 70L. The first side hook 70R has an opening / closing guide hole 73R into which the opening / closing pin 71a is inserted, and the second side hook 70L has an opening / closing guide hole 73L into which the opening / closing pin 71a is inserted.

[0047] The opening / closing guide holes 73R, 73L are formed as grooves extending in the movement direction of the sleeve 71. The opening / closing guide hole 73R is provided with an opening / closing portion 73a shaped to convert the linear movement of the opening / closing pin 71a, which moves in conjunction with the sleeve 71, into an opening / closing operation caused by the rotation of the first side hook 70R about the shaft 71b as a fulcrum. The opening / closing guide hole 73L is provided with an opening / closing portion 73a shaped to convert the linear movement of the opening / closing pin 71a, which moves in conjunction with the sleeve 71, into an opening / closing operation caused by the rotation of the second side hook 70L about the shaft 71b as a fulcrum. The opening / closing portion 73a is formed as a groove inclined with respect to the movement direction of the sleeve 71 and the opening / closing pin 71a.

[0048] When the sleeve 71 moves forward as indicated by arrow A1 while the first side hook 70R is open relative to the center hook 70C, the opening / closing pin 71a presses the inner wall surface of the opening / closing portion 73a formed in the opening / closing guide hole 73R, which is the direction in which the first side hook 70R closes. As a result, the first side hook 70R rotates around the shaft 71b as a fulcrum and moves toward the center hook 70C as indicated by arrow H1.

[0049] When the sleeve 71 moves rearward as indicated by arrow A2 while the first side hook 70R is closed relative to the center hook 70C, the outer wall surface of the opening / closing portion 73a formed in the opening / closing guide hole 73R of the first side hook 70R, which is the direction in which the first side hook 70R opens, is pressed by the opening / closing pin 71a. As a result, the first side hook 70R rotates about the shaft 71b as a fulcrum and moves away from the center hook 70C as indicated by arrow H2.

[0050] When the sleeve 71 moves forward as indicated by arrow A1 while the second side hook 70L is open relative to the center hook 70C, the inner wall surface of the opening / closing portion 73a formed in the opening / closing guide hole 73L of the second side hook 70L, which is the direction in which the second side hook 70L closes, is pressed by the opening / closing pin 71a. As a result, the second side hook 70L rotates around the shaft 71b as a fulcrum and moves toward the center hook 70C as indicated by arrow H1.

[0051] When the sleeve 71 moves rearward as indicated by arrow A2 while the second side hook 70L is closed relative to the center hook 70C, the outer wall surface of the opening / closing portion 73a formed in the opening / closing guide hole 73R of the second side hook 70L, which is the direction in which the second side hook 70L opens, is pressed by the opening / closing pin 71a. As a result, the second side hook 70L rotates about the shaft 71b as a fulcrum and moves away from the center hook 70C as indicated by arrow H2.

[0052] The opening / closing guide hole 73L provided in the second side hook 70L has a locking portion 73b and a release portion 73c. ​​The opening / closing guide hole 73L has the locking portion 73b formed downstream of the opening / closing portion 73a with respect to the forward movement direction of the sleeve 71 indicated by the arrow A1, and the release portion 73c formed downstream of the locking portion 73b.

[0053] The locking portion 73b is formed on the inner wall surface of the opening / closing guide hole 73L facing the direction of arrow H1, which is the closing direction of the second side hook 70L. The locking portion 73b faces the outer wall surface of the opening / closing guide hole 73L across a distance approximately equal to the diameter of the opening / closing pin 71a, and extends parallel to the outer wall surface.

[0054] The unlocking portion 73c is configured by providing a recess that is recessed relative to the locking portion 73b on the inner wall surface of the opening / closing guide hole 73L. The unlocking portion 73c faces the outer wall surface of the opening / closing guide hole 73L with a gap slightly larger than the diameter of the opening / closing pin 71a, and extends parallel to the outer wall surface.

[0055] 3B, in the range where the opening-closing pin 71a is positioned in the locking portion 73b of the opening-closing guide hole 73L, the second side hook 70L locks the wire W in a state that does not allow movement of the wire W. Here, in the range where the opening-closing pin 71a is positioned in the locking portion 73b of the opening-closing guide hole 73L, the wire W is fed in the reverse direction and wound around the reinforcing bar S, as will be described later.

[0056] In contrast, the opening / closing pin 71a moves in the direction of arrow A1 in conjunction with the sleeve 71, and as shown in Figure 3C, within the range in which the opening / closing pin 71a is positioned at the unlocking portion 73c of the opening / closing guide hole 73L, the second side hook 70L can move in the direction away from the center hook 70C, as indicated by arrow H2, a predetermined amount to prevent the wire W from slipping out from between the second side hook 70L and the center hook 70C.

[0057] The sleeve 71 includes a bending portion 71c1 that bends the wire W into a predetermined shape by pushing in a predetermined direction the tip side, which is one end of the wire W, to bend it. The sleeve 71 also includes a bending portion 71c2 that bends in a predetermined direction the other end, which is the terminal side, of the wire W cut by the cutting portion 6, to bend it into a predetermined shape. The bending portions 71c1 and 71c2 are formed at the end of the sleeve 71 in the forward direction indicated by the arrow A1.

[0058] As the sleeve 71 moves forward as indicated by arrow A1, the bending portion 71c1 pushes the tip end of the wire W, which is held by the center hook 70C and the second side hook 70L, and bends it toward the rebar S. As the sleeve 71 moves forward as indicated by arrow A1, the bending portion 71c2 pushes the end end of the wire W, which is held by the center hook 70C and the first side hook 70R and cut by the cutting portion 6, and bends it toward the rebar S.

[0059] The binding unit 7 includes a rotation restricting unit 74 that restricts the rotation of the locking member 70 and the sleeve 71 in conjunction with the rotational movement of the rotary shaft 72. The rotation restricting unit 74 includes a rotation restricting blade 74a on the sleeve 71, and a rotation restricting claw (not shown) on the main body 10 to which the rotation restricting blade 74a is locked.

[0060] The rotation restriction blade 74a is configured by providing a plurality of protrusions that protrude radially from the outer periphery of the sleeve 71 at predetermined intervals around the circumference of the sleeve 71. The rotation restriction blade 74a is fixed to the sleeve 71 and moves and rotates integrally with the sleeve 71.

[0061] The rotation restricting portion 74 has a locking member 70 that locks the wire W, and after winding the wire W around the reinforcing bar S, cuts it. Furthermore, the rotation restricting blade 74a is locked in the operating range where the wire W is bent and shaped at the bending portions 71c1 and 71c2 of the sleeve 71. When the rotation restricting blade 74a is locked, the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72 is restricted, and the rotation of the rotating shaft 72 moves the sleeve 71 in the front-to-rear direction.

[0062] Furthermore, in the range of motion of the rotation restricting portion 74 to twist the wire W locked by the locking member 70, the rotation restricting blade 74a is released. When the rotation restricting blade 74a is released, the sleeve 71 rotates in conjunction with the rotation of the rotating shaft 72. In the locking member 70, the center hook 70C, first side hook 70R, and second side hook 70L that have locked the wire W rotate in conjunction with the rotation of the sleeve 71. In the range of motion of the sleeve 71 and the locking member 70 along the axial direction of the rotating shaft 72, the range of motion in which the locking member 70 locks the wire W is referred to as the first range of motion. Furthermore, the range of motion in which the wire W locked by the locking member 70 is twisted is referred to as the second range of motion.

[0063] The binding unit 7 includes a moving member 75 that activates the transmission unit 9. The moving member 75 is rotatably attached to the sleeve 71 and configured to be movable in the front-to-rear direction in conjunction with the sleeve 71 but not in conjunction with the rotation of the sleeve 71.

[0064] The moving member 75 has an engaging portion 75a that engages with the cam 90 of the transmission portion 9. The engaging portion 75a moves in the front-rear direction in conjunction with the sleeve 71, but not in conjunction with the rotation of the sleeve 71.

[0065] 3D shows a modified example of the opening / closing guide hole 73L provided in the second side hook 70L, in which the opening / closing guide hole 73L may include a first locking portion 73b, an unlocking portion 73c, and a second locking portion 73d. The opening / closing guide hole 73L is formed with the first locking portion 73b downstream of the opening / closing portion 73a, the unlocking portion 73c downstream of the first locking portion 73b, and the second locking portion 73d downstream of the unlocking portion 73c, relative to the forward movement direction of the sleeve 71 indicated by arrow A1.

[0066] The first and second locking portions 73b and 73d are formed on the inner wall surface of the opening / closing guide hole 73L facing the direction of arrow H1, which is the closing direction of the second side hook 70L. The first and second locking portions 73b and 73d face the outer wall surface of the opening / closing guide hole 73L across a distance approximately equal to the diameter of the opening / closing pin 71a and extend parallel to the outer wall surface.

[0067] The unlocking portion 73c is configured by providing a recess on the inner wall surface of the opening / closing guide hole 73L that is recessed relative to the first locking portion 73b and the second locking portion 73d. The unlocking portion 73c faces the outer wall surface of the opening / closing guide hole 73L with a gap slightly larger than the diameter of the opening / closing pin 71a, and extends parallel to the outer wall surface.

[0068] In the modified example shown in Figure 3D, the second side hook 70L moves the opening / closing pin 71a in the direction of arrow A1, and the opening / closing pin 71a moves along the inner wall surface of the opening / closing guide hole 73L, and the wire W is engaged in a state where movement of the wire W is not permitted within the range where the opening / closing pin 71a is positioned at the first engagement portion 73b of the opening / closing guide hole 73L as shown by the solid line.

[0069] In contrast, when the opening / closing pin 71a moves in the direction of arrow A1 and is positioned at the release portion 73c of the opening / closing guide hole 73L as shown by the dotted line, the opening / closing guide hole 73L can be displaced relative to the opening / closing pin 71a to the position shown by the dotted line, and the second side hook 70L can move away from the center hook 70C in the direction shown by arrow H2 a predetermined amount so that the wire W does not slip out from between the second side hook 70L and the center hook 70C.

[0070] Furthermore, when the opening / closing pin 71a moves in the direction of arrow A1 and is positioned at the second locking portion 73d of the opening / closing guide hole 73L as indicated by the dashed line, the wire W is locked in a state that does not allow movement of the wire W. Here, when the opening / closing pin 71a is positioned at the second locking portion 73d of the opening / closing guide hole 73L, the wire W is twisted in the bundling part 7, as will be described later.

[0071] 3E, the opening / closing guide hole 73L includes a first locking portion 73b, an unlocking portion 73c, and a second locking portion 73d. The portion of the unlocking portion 73c that connects to the first locking portion 73b faces the outer wall surface of the opening / closing guide hole 73L with a distance slightly larger than the diameter of the opening / closing pin 71a. The unlocking portion 73c is formed as a slope that is inclined relative to the outer wall surface, and connects to the second locking portion 73d.

[0072] In the modified example shown in Figure 3E, the second side hook 70L moves the opening / closing pin 71a in the direction of arrow A1, and the opening / closing pin 71a moves along the inner wall surface of the opening / closing guide hole 73L, and the wire W is engaged in a state where it is not allowed to move within the range where the opening / closing pin 71a is positioned at the first engagement portion 73b of the opening / closing guide hole 73L as shown by the solid line.

[0073] In contrast, when the opening-closing pin 71a moves in the direction of arrow A1 and is positioned at the unlocking portion 73c of the opening-closing guide hole 73L as indicated by the two-dot chain line, the opening-closing guide hole 73L can be displaced relative to the opening-closing pin 71a to the position indicated by the two-dot chain line, and the second side hook 70L can move in the direction away from the center hook 70C as indicated by arrow H2 a predetermined amount to prevent the wire W from slipping out from between the second side hook 70L and the center hook 70C. Furthermore, within the range where the opening-closing pin 71a is positioned at the unlocking portion 73c of the opening-closing guide hole 73L, the amount of movement of the second side hook 70L in the direction away from the center hook 70C decreases as the opening-closing pin 71a approaches the second locking portion 73d.

[0074] Then, when the opening / closing pin 71a moves in the direction of arrow A1 and is positioned at the second engagement portion 73d of the opening / closing guide hole 73L as shown by the dashed line, the wire W is engaged in a state that does not allow the wire W to move.

[0075] 3F, the opening / closing guide hole 73L includes a first locking portion 73b, an unlocking portion 73c, and a second locking portion 73d. The portion of the unlocking portion 73c that connects to the first locking portion 73b faces the outer wall surface of the opening / closing guide hole 73L with a distance slightly larger than the diameter of the opening / closing pin 71a. The unlocking portion 73c is formed as a slope that is inclined relative to the outer wall surface, and connects to the second locking portion 73d.

[0076] The second locking portion 73d is formed of a slope that connects to the unlocking portion 73c. ​​The second locking portion 73d has a distance between the inner wall surface and the outer wall surface of the opening / closing guide hole 73L that becomes smaller toward the front side of the opening / closing guide hole 73L, and at the front end of the opening / closing guide hole 73L, the inner wall surface and the outer wall surface face each other with a distance approximately equal to the diameter of the opening / closing pin 71a.

[0077] In the modified example shown in Figure 3F, the second side hook 70L moves the opening / closing pin 71a in the direction of arrow A1, and the opening / closing pin 71a moves along the inner wall surface of the opening / closing guide hole 73L, and the wire W is engaged in a state where it is not allowed to move within the range where the opening / closing pin 71a is positioned at the first engagement portion 73b of the opening / closing guide hole 73L as shown by the solid line.

[0078] In contrast, when the opening-closing pin 71a moves in the direction of arrow A1 and is positioned at the unlocking portion 73c of the opening-closing guide hole 73L as indicated by the two-dot chain line, the opening-closing guide hole 73L can be displaced relative to the opening-closing pin 71a to the position indicated by the two-dot chain line, and the second side hook 70L can move in the direction away from the center hook 70C as indicated by arrow H2 a predetermined amount to prevent the wire W from slipping out from between the second side hook 70L and the center hook 70C. Furthermore, within the range where the opening-closing pin 71a is positioned at the unlocking portion 73c of the opening-closing guide hole 73L, the amount of movement of the second side hook 70L in the direction away from the center hook 70C decreases as the opening-closing pin 71a approaches the second locking portion 73d.

[0079] Then, when the opening / closing pin 71a moves in the direction of arrow A1 and is positioned at the second engagement portion 73d of the opening / closing guide hole 73L as shown by the dashed line, the wire W is engaged in a state that does not allow the wire W to move.

[0080] Example of cutting part Figures 4A and 4B are plan views showing an example of a cutting portion of this embodiment, Figures 4C to 4E are perspective views showing an example of a cutting portion of this embodiment, and Figures 4F and 4G are plan views showing modified examples of the cutting portion of this embodiment.Next, with reference to each figure, an example of a cutting portion of this embodiment will be described.

[0081] The fixed blade unit 60 is an example of a blade unit, and has a cylindrical shape that serves as the axis of rotation of the movable blade unit 61, and is provided with an opening 60a that penetrates the cylindrical shape in the radial direction along the feed path of the wire W. The opening 60a has a shape that allows the wire W to pass through. In a configuration in which the reinforcing bars S are bound together with two wires W, the cross-sectional shape of the opening 60a is an elongated hole that follows the direction in which the two wires W are arranged side by side.

[0082] Preferably, the opening 60a has, for example, a tapered shape so that the opening area on the inlet side and outlet side of the opening 60a increases with the feed of the wire W in the forward direction indicated by the arrow F. The fixed blade portion 60 is provided downstream of the wire guide 4 with respect to the feed direction of the wire W fed in the forward direction.

[0083] In a configuration in which reinforcing bars S are bound with two wires W, the fixed blade 60 has a first abutment portion 60b and a second abutment portion 60c at the end of an opening 60a exposed to the circumferential surface along which the movable blade 61 slides. The fixed blade 60 has a plurality of abutment portions provided in the direction in which the plurality of wires W are arranged in parallel, and in this example, one abutment portion, the first abutment portion 60b, and the other abutment portion, the second abutment portion 60c, are provided along the direction in which the two wires W are arranged in parallel.

[0084] The fixed blade 60 has a first abutment portion 60b on the front side and a second abutment portion 60c on the back side in the movement direction of the movable blade 61 indicated by arrow D1. The fixed blade 60 has a step portion 60d formed between the first abutment portion 60b and the second abutment portion 60c by retracting the second abutment portion 60c in the movement direction of the movable blade 61 indicated by arrow D1. The amount of retraction is preferably about half the diameter of the wire W.

[0085] The fixed blade 60 includes a restricting portion 60e that restricts the wire W, which has been abutted against the first abutting portion 60b, from moving toward the second abutting portion 60c. The restricting portion 60e is a plane that extends in a direction substantially perpendicular to the moving direction of the movable blade 61 indicated by the arrow D1, and is provided between the first abutting portion 60b and the step portion 60d.

[0086] The movable blade portion 61 is an example of a blade portion and is shaped to slide along the peripheral surface of the fixed blade portion 60, and slides against the opening end of the opening 60a of the fixed blade portion 60 by rotating with the fixed blade portion 60 as the fulcrum axis.

[0087] The cutting unit 6 includes walls 62a and 62b that prevent foreign matter from entering. The walls 62a and 62b are provided on the upstream and downstream sides of the opening 60a of the fixed blade unit 60, along the rotational movement of the movable blade unit 61. The walls 62a and 62b are shaped to follow the path of the rotational movement of the movable blade unit 61, with the fixed blade unit 60 as the fulcrum, and prevent foreign matter, such as dust entering through the opening at the front end of the main body 10 and shavings generated by the friction of the wire W and rebar S, from entering around the movable blade unit 61. This prevents malfunction of the movable blade unit 61 and an increase in the load required to rotate the movable blade unit 61.

[0088] In the cutting unit 6, when the movable blade unit 61 rotates from the initial position in the direction of arrow D1, the wire W passed through the opening 60a of the fixed blade unit 60 is pressed against the opening edge of the opening 60a by the movable blade unit 61. Of the two parallel wires W, one wire W is pressed against the edge of the first abutment portion 60b of the fixed blade unit 60 by the operation of the movable blade unit 61, and the other wire W enters the second abutment portion 60c of the fixed blade unit 60. As a result, a shearing force is applied to one wire W, and cutting of one wire W begins before cutting of the other wire W.

[0089] As the movable blade portion 61 rotates in the direction of arrow D1, it begins cutting one of the wires, the first wire W, and when this first wire W is cut to a predetermined position, the other wire, the second wire W, is pressed against the edge of the second abutment portion 60c of the fixed blade portion 60 by the operation of the movable blade portion 61.

[0090] This starts cutting the second wire W. Preferably, the shapes of the first butting portion 60b and the second butting portion 60c are set so that after starting cutting the first wire W, cutting of the second wire W starts when at least half of the first wire W in the radial direction has been cut. That is, the distance from the edge of the first butting portion 60b to the edge of the second butting portion 60c along the rotation direction of the movable blade portion 61 indicated by arrow D1 is set to approximately half of the radial direction of the wire W.

[0091] When the movable blade 61 further rotates in the direction of arrow D1, cutting of one of the wires W that started cutting first is completed. Then, when the movable blade 61 further rotates in the direction of arrow D1 to the cutting completion position, cutting of the other wire W that started cutting later is completed.

[0092] The fixed blade portion 60 has a restricting portion 60e formed between the first abutment portion 60b and the second abutment portion 60c, the restricting portion 60e having a plane extending in a direction approximately perpendicular to the movement direction of the movable blade portion 61 indicated by arrow D1.

[0093] This prevents the wire W, which has been abutted against the first abutment portion 60b by the movable blade portion 61, from moving toward the second abutment portion 60c. Furthermore, by preventing the wire W from moving toward the second abutment portion 60c, wear of the stepped portion 60d is prevented, and a decrease in the difference in 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 prevented. This ensures a phase difference in the timing at which cutting of the two wires W starts, thereby preventing an increase in load caused by cutting of the two wires W starting at approximately the same time.

[0094] The restricting portion 60e may be configured by providing a flat surface extending in a direction substantially perpendicular to the moving direction of the movable blade portion 61 indicated by arrow D1, in a part between the first abutting portion 60b and the step portion 60d. The restricting portion 60e may also be configured by the step portion 60d being a slope or curved surface that protrudes from the first abutting portion 60b toward the second abutting portion 60c in the opposite direction (arrow D2) to the moving direction of the movable blade portion 61 indicated by arrow D1.

[0095] 4F, the restricting portion 60e may be configured as a convex portion that protrudes from the first abutting portion 60b and the second abutting portion 60c between the first abutting portion 60b and the second abutting portion 60c along the direction (arrow D2) opposite to the moving direction of the movable blade portion 61 indicated by arrow D1. This makes the first abutting portion 60b concave, and prevents the wire W that has been abutted against the first abutting portion 60b by the movable blade portion 61 from moving toward the second abutting portion 60c.

[0096] 4G, the restricting portion 60e may be shaped to separate the first abutting portion 60b and the second abutting portion 60c, thereby separating the first abutting portion 60b and the second abutting portion 60c, and the wire W abutted against the first abutting portion 60b by the movable blade portion 61 is prevented from moving toward the second abutting portion 60c.

[0097] Example of transmission part Next, an example of the transmission unit 9 of this embodiment will be described with reference to the drawings. In the transmission unit 9, a cam 90 is supported rotatably around a shaft 90a. The shaft 90a is attached to a frame 10a that is attached inside the main body 10. The frame 10a includes a guide portion 10b that regulates the movement direction of the link 91. The guide portion 10b is formed by an elongated hole that penetrates the plate-shaped frame 10a.

[0098] The cam 90 is an example of a displacement member and has a cam groove 92 whose length from the shaft 90a varies. The cam groove 92 extends in the radial and circumferential directions of the cam 90 centered on the shaft 90a, and intersects with the guide portion 10b of the frame 10a. The cam groove 92 penetrates the plate-shaped cam 90, thereby communicating the intersection of the cam groove 90 and the guide portion 10b.

[0099] The cam 90 rotates around the shaft 90a as a fulcrum, changing the location of the cam groove 92 that intersects with the guide portion 10b, and changing the length from the shaft 90a to the intersection of the cam groove 92 and the guide portion 10b.

[0100] The cam 90 rotates around the shaft 90a as a fulcrum, and a range of large and small changes in the length between the shaft 90a and the cam groove 92 are set for the same amount of rotation of the cam 90. In this example, there is a first range 92a in which the amount of change in the length between the shaft 90a and the cam groove 92 is the largest, a second range 92b in which the amount of change in the length between the shaft 90a and the cam groove 92 is smaller than the first range 92a, and a third range 92c in which there is almost no change in the length between the shaft 90a and the cam groove 92.

[0101] The cam 90 rotates in the direction of arrow C1 around the axis 90a as a fulcrum, and while the first range 92a of the cam groove 92 intersects with the guide portion 10b, the length from the axis 90a to the intersection of the cam groove 92 and the guide portion 10b is shorter and the change in length between the axis 90a and the cam groove 92 is greater than while the second range 92b intersects with the guide portion 10b.

[0102] In addition, the cam 90 rotates in the direction of arrow C1 around the axis 90a as a fulcrum, and while the second range 92b of the cam groove 92 intersects with the guide portion 10b, the length from the axis 90a to the intersection of the cam groove 92 and the guide portion 10b is longer and the change in length between the axis 90a and the cam groove 92 is smaller than while the first range 92a intersects with the guide portion 10b.

[0103] Furthermore, the cam 90 rotates in the direction of arrow C1 around the axis 90a as a fulcrum, and while the third range 92c of the cam groove 92 intersects with the guide portion 10b, the length from the axis 90a to the intersection of the cam groove 92 and the guide portion 10b is approximately the same as while the second range 92b intersects with the guide portion 10b, and the change in the length between the axis 90a and the cam groove 92 is even smaller and remains approximately constant.

[0104] The cam 90 has an engaged portion 93 to which the movement of the sleeve 71 is transmitted via the moving member 75. The engaged portion 93 is provided on the opposite side of the shaft 90a from the cam groove 92, and is disposed on the trajectory of the engaging portion 75a caused by the movement of the moving member 75 linked to the movement of the sleeve 71 in the forward and backward directions indicated by arrows A1 and A2. The engaged portion 93 is engaged by the engaging portion 75a of the moving member 75 when the sleeve 71 moves forward indicated by arrow A1.

[0105] The cam 90 rotates around the shaft 90a as a fulcrum, and is biased by a spring 94 in the direction of arrow C2, in which the first region 92a of the cam groove 92 intersects with the guide portion 10b. The spring 94 is, for example, a torsion coil spring attached to the shaft 90a. The rotation direction of the cam 90 indicated by the arrow C2 is the direction in which the movable blade unit 61, connected by the link 91, returns from the cutting completion position to the initial position. Considering the possibility that the force of the spring 94 may prevent the cam 90 from rotating in the direction of arrow C2 when the movable blade unit 61 returns from the cutting completion position to the initial position, the moving member 75 is provided with a pressing protrusion 76, and the cam 90 is provided with a pressed protrusion 96. As the moving member 75 moves in the direction of arrow A1 and the cam 90 rotates until the movable blade unit 61 rotates to the cutting completion position, the pressing protrusion 76 and the pressed protrusion 96 face each other. Then, as the sleeve 71 moves in the direction of the arrow A2, the pressing protrusion 76 presses the pressed protrusion 96, thereby forcibly starting the rotation of the cam 90 in the direction of the arrow C2.

[0106] Link 91 is an example of a transmission member, and its front end indicated by arrow A1 is connected to movable blade unit 61, and its rear end indicated by arrow A2 is connected to cam 90. Link 91 has a shaft 91a that fits into cam groove 92 of cam 90 and guide portion 10b of frame 10a. Shaft 91a is made up of a rotor 91a1 that fits into cam groove 92 and a shaft 91a2 that rotatably supports rotor 91a1 and is non-rotatable relative to link 91 that fits into guide portion 10b, and is inserted into cam groove 92 and guide portion 10b at the intersection of cam groove 92 and guide portion 10b. Shaft 91a moves along cam groove 92 and guide portion 10b as cam 90 rotates around shaft 91a. Here, when cam 90 rotates around shaft 90a as a fulcrum, the force acting in the circumferential direction of rotor 91a1 due to sliding between cam groove 92 and rotor 91a1 is opposite to the force acting in the circumferential direction of shaft 91a2 due to sliding between guide portion 10b and shaft 91a2. Therefore, in shaft 91a, rotor 91a1 and shaft 91a2 are formed as separate parts. Shaft 91a may also be configured to include a first rotor that fits into cam groove 92, a second rotor that fits into guide portion 10b, and a shaft that rotatably supports the first rotor and the second rotor.

[0107] When the sleeve 71 moves forward as indicated by the arrow A1, the movable member 75 moves forward as indicated by the arrow A1 in conjunction with the sleeve 71. As the movable member 75 moves forward as indicated by the arrow A1, the engaging portion 75a engages with the engaged portion 93 of the cam 90.

[0108] When the movable member 75 moves further forward as indicated by the arrow A1, the engaged portion 93 is pushed forward, causing the cam 90 to rotate in the direction of the arrow C1 around the shaft 90a as a fulcrum. When the cam 90 rotates in the direction of the arrow C1, the portion of the cam groove 92 that intersects with the guide portion 10b changes, and the length from the shaft 90a to the intersection of the cam groove 92 and the guide portion 10b changes and increases.

[0109] As a result, when the cam 90 rotates in the direction of arrow C1 and the shaft portion 91a of the link 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.

[0110] When the shaft 91a of the link 91 moves in a direction away from the shaft 90a of the cam 90, the transmission unit 9 converts the rotational movement of the cam 90 into movement along the extension direction of the link 91.

[0111] As a result, the rotation of the cam 90 is transmitted to the movable blade 61 via the link 91, causing the movable blade 61 to rotate in the direction of arrow D1. Therefore, the forward movement of the sleeve 71 causes the movable blade 61 to rotate in a predetermined direction, and the wire W is cut.

[0112] The period during which the first range 92a of the cam groove 92 intersects with the guide portion 10b is the period from when the movable blade portion 61 in the cutting portion 6 starts to rotate until cutting of the first wire W begins. The period until cutting of the first wire W begins is a low load region.

[0113] Additionally, while the second range 92b of the cam groove 92 intersects with the guide portion 10b, the movable blade unit 61 rotates in the cutting unit 6, and this is the period from when cutting of the first wire W begins to when cutting of the second wire W ends. This is a high-load region from when cutting of the first wire W begins to when cutting of the second wire W ends. Furthermore, while the third range 92c of the cam groove 92 intersects with the guide portion 10b, this is the period after cutting of the second wire W ends and rotation of the movable blade unit 61 stops. In this way, the cutter that has completed the wire cutting operation does not need to rotate more than necessary relative to the amount of movement of the movable member 75.

[0114] In the above embodiment, the cam 90 is configured such that the length from the intersection of the cam groove 92, which is the first connecting portion connected to the link 91, and the guide portion 10b to the axis 90a can be switched by rotating the axis 90a as a fulcrum depending on the shape of the cam groove 92.

[0115] As a result, the cam 90 can switch the amount of rotation (amount of movement) of the movable blade 61 and the force that can be generated by the movable blade 61 within the rotation range (movement range) of the movable blade 61.

[0116] In contrast to this, the cam 90 may be configured such that the length from the engaged portion 93, which is the second connecting portion connected to the sleeve 71, to the shaft 90a can be changed by a rotational movement with the shaft 90a as a fulcrum.

[0117] Example of reducer implementation Figure 5A is a side cross-sectional view showing an example of a reducer of this embodiment, Figure 5B is a perspective view showing an example of a reducer of this embodiment, Figure 5C is a side cross-sectional view of a main part showing a modified example of a reducer of this embodiment, and Figure 5D is a perspective view showing a modified example of a reducer of this embodiment.Next, with reference to each figure, an example of a reducer of this embodiment will be described.

[0118] The reducer 81 is composed of planetary gears whose input and output shafts are aligned coaxially, and is equipped with a first sun gear 82a attached to 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 planet cage 84a supporting the first planetary gear 83a.

[0119] The reducer 81 also includes a second sun gear 82b provided on the first planet cage 84a, a second planetary gear 83b that meshes with the second sun gear 82b, and a second planetary cage 84b that supports the second planetary gear 83b.

[0120] Furthermore, the reducer 81 includes an internal gear 85 with which the first planetary gear 83a and the second planetary gear 83b mesh.

[0121] The internal gear 85 of the reducer 81 is fixed to the main body 10. The first planet cage 84a and the second planet cage 84b of the reducer 81 are arranged coaxially with the shaft 80a of the motor 80. Furthermore, the second planet cage 84b of the reducer 81 is connected to the rotating shaft 72 to form the output shaft.

[0122] The reducer 81 has a front side 84f, which is one side along the axial direction of the second planet cage 84b, protruding from the internal gear 85. The front side 84f of the second planet cage 84b protruding from the internal gear 85 is rotatably supported by the main body 10 via a bearing 86.

[0123] Additionally, a rear side portion 84r of the second planet cage 84b, which is the other axial side, is located inside the internal gear 85, and the rear side portion 84r is supported on the internal gear 85 by a support member 87. Because the internal gear 85 is fixed to the main body 10, the rear side portion 84r of the second planet cage 84b is supported on the main body 10 via the support member 87 and the internal gear 85, which form a sliding bearing. The support member 87 may also be formed from a bearing.

[0124] The reducer 81 also has a gear holder 88 between the first planet cage 84a and the second planetary gear 83b. The gear holder 88 is made up of a disk-shaped member with a hole in the center for fitting the second sun gear 82b, and is placed between the first planet cage 84a and the second planetary gear 83b outside the second sun gear 82b to ensure a gap between the first planet cage 84a and the second planetary gear 83b.

[0125] As a result, the front side portion 84f and rear side portion 84r of the second planet cage 84b along the axial direction are supported by the main body portion 10. Therefore, with a simple configuration, tilting of the second planet cage 84b in the axial direction is suppressed, and changes in meshing between the sun gear and planetary gear, and between the planet gear and internal gear, and interference between gears lined up in the axial direction, and between the gear and the planet cage, etc. are suppressed.

[0126] 5C and 5D, a gear holder 88a may be provided integrally with the first planet cage 84a. The gear holder 88a is a disk-shaped member with a hole in the center for receiving the second sun gear 82b, and is provided integrally with the first planet cage 84a outside the second sun gear 82b. As a result, the gear holder 88a is inserted between the first planet cage 84a and the second planetary gear 83b outside the second sun gear 82b, ensuring a gap between the first planet cage 84a and the second planetary gear 83b.

[0127] Example of curl forming unit 6A to 6D are plan views showing an example of the curl forming section of the present embodiment, and next, an example of the curl forming section of the present embodiment will be described with reference to each drawing.

[0128] The curl forming unit 5 includes a guide groove 52 that forms a feed path for the wire W in the curl forming unit 5, and a first guide member 53a and a second guide member 53b that cooperate with the guide groove 52 to give the wire W a curl.

[0129] The first guide member 53a is provided on the introduction side of the wire W fed in the forward direction by the wire feed unit 3 in the curl guide 50, and is disposed radially inside the loop Ru formed by the wire W with respect to the feed path of the wire W according to the guide groove 52. The first guide member 53a regulates the feed path of the wire W so that the wire W fed along the guide groove 52 does not enter the radial inside of the loop Ru formed by the wire W.

[0130] The second guide member 53b is provided on the discharge side of the wire W fed in the forward direction by the wire feed section 3 in the curl guide 50, and is positioned radially outside the loop Ru formed by the wire W relative to the feed path of the wire W by the guide groove 52.

[0131] The curl forming unit 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 attached to a frame 55 that fixes the curl guide 50 to the main body 10, with a shaft 54a as a fulcrum, and the first guide member 53a is displaced in a direction that protrudes from and a direction that retracts from the feed path of the wire W.

[0132] The retracting mechanism 54 is biased by a biasing member 56 such as a spring in a direction in which the first guide member 53a protrudes into the feeding path of the wire W.

[0133] The retraction mechanism 54 also includes a guide portion 57 that displaces the retraction mechanism 54 in a direction in which the first guide member 53a retracts relative to the feed path of the wire W. The guide portion 57 is configured as a slope that, when pushed by the wire W during the operation of winding the wire W around the reinforcing bar S, generates a force that displaces the retraction mechanism 54 in a direction in which the first guide member 53a retracts relative to the feed path of the wire W.

[0134] Furthermore, the retraction mechanism 54 includes a wire guide portion 58 that constitutes a part of the guide groove 52. When the retraction mechanism 54 moves in a direction in which the first guide member 53a protrudes relative to the feed path of the wire W, the wire guide portion 58 protrudes into the feed path of the wire W and constitutes a part of the guide groove 52. When the retraction mechanism 54 moves in a direction in which the first guide member 53a retracts relative to the feed path of the wire W, the wire guide portion 58 protrudes into the feed path of the wire W and blocks the path in which the wire W is exposed outside the guide groove 52.

[0135] The curl forming section 5 includes a feed restricting section 59 against which the tip of the wire W abuts in a feed path of the wire W that has been curled by the curl guide 50 and is guided to the bundling section 7 by the induction guide 51.

[0136] The retracting mechanism 54 is engaged with a moving member 75 that moves in conjunction with the sleeve 71, and includes an opening / closing restricting portion 54b that contacts an opening / closing restricting member 55a that moves in conjunction with the moving member 75. When the first guide member 53a moves in a direction in which it protrudes relative to the feed path of the wire W, the opening / closing restricting portion 54b comes into contact with the opening / closing restricting member 55a, thereby restricting rotation of the retracting mechanism 54 about the shaft 54a as a fulcrum.

[0137] Furthermore, the opening / closing restricting member 55a moves in conjunction with the operation of the binding unit 7 that locks the wire W with the locking member 70, and when the opening 55b of the opening / closing restricting member 55a moves to a position facing the opening / closing restricting portion 54b of the retracting mechanism 54, the opening / closing restricting portion 54b enters the opening 55b, thereby releasing the restriction on rotation about the shaft 54a of the retracting mechanism 54. This allows the retracting mechanism 54 to move by rotating about the shaft 54a in a direction in which the first guide member 53a retracts relative to the feed path of the wire W.

[0138] <Example of operation of the reinforcing bar binding machine according to this embodiment> Next, with reference to the respective drawings, an operation of binding reinforcing bars S with wire W using the reinforcing bar binding machine 1A of this embodiment will be described.

[0139] The rebar binding machine 1A is in a standby state in which the wire W is clamped between a pair of feed gears 30, and the tip of the wire W is positioned between the clamping position of the feed gears 30 and the fixed blade portion 60 of the cutting unit 6. In addition, when the rebar binding machine 1A is in a standby state, the sleeve 71 and the first side hook 70R, second side hook 70L, and center hook 70C attached to the sleeve 71 move rearward as indicated by arrow A2, and as shown in FIG. 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.

[0140] When the reinforcing bar S is placed between the curl guide 50 and the guide 51 of the curl forming section 5 and the trigger 12 is operated, the feed motor (not shown) is driven in the forward direction, and the wire W is fed in the forward direction indicated by the arrow F in the wire feeding section 3.

[0141] In the case of a configuration in which a plurality of wires, for example, two wires W, are fed, the two wires W are fed by the wire guide 4 in a state in which they are arranged in parallel along the axial direction of the loop Ru formed by the wires W.

[0142] The wire W fed in the forward direction passes between the center hook 70C and the first side hook 70R and is fed to the curl guide 50 of the curl forming unit 5. By passing through the curl guide 50, the wire W is given a curl that wraps around the reinforcing bar S.

[0143] The wire W having been curled by the curl guide 50 is guided by the induction guide 51 and further fed in the forward direction by the wire feed unit 3, whereby the wire W is guided by the induction guide 51 to between the center hook 70C and the second side hook 70L. The wire W is then fed until its tip abuts against the feed restricting unit 59. When the tip of the wire W has been fed to the position where it abuts against the feed restricting unit 59, the drive of the feed motor (not shown) is stopped.

[0144] After the forward feed of the wire W is stopped, the motor 80 is driven in the forward rotation direction. In the first operating range in which the locking member 70 locks the wire W, the rotation restricting blade 74a of the sleeve 71 is locked, thereby restricting the rotation of the sleeve 71 linked to the rotation of the rotary shaft 72. As a result, the rotation of the motor 80 is converted into linear movement, and the sleeve 71 moves forward in the direction of arrow A1.

[0145] When the sleeve 71 of the locking member 70 moves forward as indicated by the arrow A1, the first side hook 70R and the second side hook 70L move in a direction approaching the center hook 70C by rotating around the axis 71b, due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide holes 73R and 73L.

[0146] That is, when the sleeve 71 moves forward as indicated by the arrow A1, the inner wall surface of the opening / closing portion 73a formed in the opening / closing guide hole 73R of the first side hook 70R, which is the direction in which the first side hook 70R closes, is pressed by the opening / closing pin 71a, causing the first side hook 70R to rotate about the shaft 71b as a fulcrum and move in a direction approaching the center hook 70C.

[0147] Furthermore, when the sleeve 71 moves forward as indicated by the arrow A1, the inner wall surface of the opening / closing portion 73a of the opening / closing guide hole 73L of the second side hook 70L, which is the direction in which the second side hook 70L closes, is pressed by the opening / closing pin 71a, causing the second side hook 70L to rotate about the shaft 71b as a fulcrum and move closer to the center hook 70C.

[0148] This causes the first side hook 70R and the second side hook 70L to close against the center hook 70C.

[0149] When the first side hook 70R closes against 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.

[0150] In contrast, when the second side hook 70L closes against the center hook 70C, as shown in Figure 3B, within the range where the opening / closing pin 71a is positioned at the locking portion 73b of 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 slipping out from between the second side hook 70L and the center hook 70C.

[0151] As the first side hook 70R and the second side hook 70L close, the opening / closing pin 71a is positioned at the locking portion 73b of the opening / closing guide hole 73L, and the sleeve 71 is advanced to a position where the wire W is locked. After that, the rotation of the motor 80 is temporarily stopped, and the feed motor (not shown) is driven in the reverse direction.

[0152] As a result, the pair of feed gears 30 rotate in the reverse direction, and the wire W held between the pair of feed gears 30 is fed in the reverse direction indicated by the arrow R. Because the tip end of the wire W is locked between the second side hook 70L and the center hook 70C in a manner that prevents it from slipping out, the wire W is wound around the reinforcing bar S by feeding the wire W in the reverse direction.

[0153] Furthermore, in the operation of winding the wire W around the reinforcing bar S, the guide portion 57 of the retraction mechanism 54 is pushed by the wire W, causing the first guide member 53a to retract relative to the feed path of the wire W.

[0154] After winding the wire W around the reinforcing bar S and stopping the reverse rotation of the feed motor (not shown), the motor 80 is driven in the forward rotation direction to further move the sleeve 71 forward as indicated by the arrow A1.

[0155] 7A to 7G are explanatory views showing an example of the operations of the binding unit, the transmission unit, and the cutting unit of this embodiment. As shown in Fig. 7A, when sleeve 71 moves forward as indicated by arrow A1, moving member 75 moves forward in conjunction with sleeve 71 as indicated by arrow A1.

[0156] As moving member 75 moves forward in the direction indicated by arrow A1, engaging portion 75a engages with engaged portion 93 of cam 90, as shown in Fig. 7B. The region in which sleeve 71 moves forward in the direction indicated by arrow A1 and engaging portion 75a of moving member 75 engages with engaged portion 93 of cam 90 is called the free running region.

[0157] When the movable member 75 moves further forward as indicated by the arrow A1, the engaged portion 93 is pushed forward, causing the cam 90 to rotate in the direction of the arrow C1 around the shaft 90a as a fulcrum. When the cam 90 rotates in the direction of the arrow C1, the portion of the cam groove 92 that intersects with the guide portion 10b changes, and the length from the shaft 90a of the cam 90 to the intersection of the cam groove 92 and the guide portion 10b changes and increases.

[0158] The link 91 has its shaft portion 91a inserted into the cam groove 92 and the guide portion 10b at the intersection of the cam groove 92 and the guide portion 10b, and the cam 90 also rotates with the shaft 90a as the fulcrum, causing the shaft portion 91a to move along the cam groove 92 and the guide portion 10b.

[0159] As a result, when the cam 90 rotates in the direction of arrow C1 and the length from the axis 90a of the cam 90 to the intersection of the cam groove 92 and the guide portion 10b changes in an increasing direction, the axis portion 91a of the link 91 moves along the cam groove 92 and the guide portion 10b, causing the axis portion 91a to move in a direction away from the axis 90a of the cam 90.

[0160] When the shaft 91a of the link 91 moves in a direction away from the shaft 90a of the cam 90, the transmission unit 9 converts the rotational movement of the cam 90 into movement along the extension direction of the link 91.

[0161] As a result, the rotation of the cam 90 is transmitted to the movable blade portion 61 via the link 91, causing the movable blade portion 61 to rotate in the direction of the arrow D1.

[0162] When the movable blade portion 61 rotates in the direction of arrow D1, one of the two parallel wires W is pressed against the edge of the first abutment portion 60b of the fixed blade portion 60 by the action of the movable blade portion 61, and the other wire W enters the second abutment portion 60c of the fixed blade portion 60, causing cutting of one wire W to begin before the other wire W.

[0163] As described above, the cam 90 rotates in the direction of arrow C1 around the shaft 90a as a fulcrum, causing the movable blade unit 61 to rotate in the direction of arrow D1, and the region until the movable blade unit 61 starts cutting the first wire W as shown in Fig. 7C is called the idling region. The idling region and idling region are regions where the load on the movable blade unit 61 is low.

[0164] In the idling region, a first range 92a of the cam groove 92 intersects with the guide portion 10b. While the first range 92a of 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 and the amount of change in the length between the shaft 90a and the cam groove 92 is greater than while the second range 92b intersects with the guide portion 10b.

[0165] As a result, the amount of rotation of the movable blade unit 61 is relatively greater than the amount of movement of the sleeve 71 that rotates the cam 90. On the other hand, in the idling region, cutting of the wire W has not started, and therefore there is no load on the movable blade unit 61 to cut the wire, so an increase in the load on the cam 90 that is connected to the movable blade unit 61 via the link 91 is suppressed.

[0166] Since the cam 90 is connected to the sleeve 71 via the moving member 75, the increase in the load on the cam 90 is suppressed, thereby suppressing the increase in the load on the rotating shaft 72 that moves the sleeve 71 and the motor 80 that is connected to the rotating shaft 72 via a reducer 81.

[0167] Therefore, in the low load region until cutting of the first wire W begins, the amount of rotation of the movable blade portion 61 is relatively increased, thereby shortening the time it takes to rotate the movable blade portion 61 to the position where cutting of the wire W begins.

[0168] When the movable member 75 moves forward as indicated by the arrow A1 to a position where the movable blade portion 61 starts cutting the first wire W, the cam 90 rotates around the axis 90a as a fulcrum, and the second range 92b of the cam groove 92 intersects with the guide portion 10b, as shown in Figure 7D.

[0169] While the second range 92b of the cam groove 92 intersects with the guide portion 10b, the length from the axis 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 axis portion 91a of the link 91 moves along the cam groove 92 and the guide portion 10b, causing the axis portion 91a to move in a direction away from the axis 90a of the cam 90.

[0170] As a result, the movable member 75 moves further forward as indicated by the arrow A1, causing the cam 90 to rotate in the direction of the arrow C1, and the rotational movement of the cam 90 is transmitted to the movable blade portion 61 via the link 91, causing the movable blade portion 61 to rotate further in the direction of the arrow D1, thereby starting to cut the first wire W.

[0171] As the movable blade portion 61 rotates in the direction of arrow D1, it begins cutting one of the wires, the first wire W, and when this first wire W is cut to a predetermined position, the other wire, the second wire W, is pressed against the edge of the second abutment portion 60c of the fixed blade portion 60 by the operation of the movable blade portion 61.

[0172] This starts cutting the second wire W. In this example, after starting cutting the first wire W, when more than half of the first wire W in the radial direction is cut, cutting of the second wire W starts.

[0173] As described above, when cutting of the first wire W is started and the second range 92b of the cam groove 92 intersects with the guide portion 10b, the length from the axis 90a to the intersection of the cam groove 92 and the guide portion 10b is longer and the amount of change in the length between the axis 90a and the cam groove 92 is smaller than the length when the first range 92a intersects with the guide portion 10b.

[0174] As a result, the amount of rotation of the movable blade 61 becomes relatively small compared to the amount of movement of the sleeve 71. On the other hand, the force that can be generated by the movable blade 61 increases when the movable blade 61 is operated by the cam 90 via the link 91.

[0175] When cutting of the first wire W begins, the load on the movable blade portion 61 increases. On the other hand, the force that can be generated by the movable blade portion 61 increases, which cancels out the load on the movable blade portion 61 and suppresses an increase in the load on the cam 90 that is connected to the movable blade portion 61 via the link 91.

[0176] By suppressing the increase in the load applied to the cam 90, the increase in the load applied to the rotary shaft 72 that moves the sleeve 71 and the motor 80 that is connected to the rotary shaft 72 via the reducer 81 is also suppressed.

[0177] When the movable blade portion 61 rotates in the direction of arrow D1 and the movable member 75 moves forward as indicated by arrow A1 from the position where it starts cutting the first wire W to the position where it starts cutting the second wire W, as shown in Figure 7E, the cam 90 rotates around the axis 90a as a fulcrum, and the second range 92b in the cam groove 92 intersects with the guide portion 10b.

[0178] When the movable blade 61 further rotates in the direction of arrow D1, cutting of one of the wires W, which started cutting first, is completed. Then, when the movable blade 61 further rotates in the direction of arrow D1, cutting of the other wire W, which started cutting later, is completed.

[0179] When the movable blade portion 61 rotates in the direction of arrow D1 and the movable member 75 moves forward as indicated by arrow A1 from the position where cutting of the second wire W begins to the position where cutting of the second wire W ends, as described above, the cam 90 rotates around the axis 90a as a fulcrum, and the second range 92b in the cam groove 92 intersects with the guide portion 10b, as shown in Figure 7F.

[0180] When cutting of the second wire W begins, the load on the movable blade portion 61 further increases. On the other hand, the load on the movable blade portion 61 is canceled out by the increase in the force that the movable blade portion 61 can generate, and the increase in the load on the cam 90 that is connected to the movable blade portion 61 via the link 91 is suppressed.

[0181] By suppressing the increase in the load applied to the cam 90, the increase in the load applied to the rotary shaft 72 that moves the sleeve 71 and the motor 80 that is connected to the rotary shaft 72 via the reducer 81 is also suppressed.

[0182] Therefore, in the high load region from when cutting of the first wire W begins until cutting of the second wire W is completed, the force that can be generated by the movable blade portion 61 can be increased, thereby suppressing an increase in the load on the motor 80. Furthermore, in the high load region, the amount of rotation of the movable blade portion 61 becomes relatively small, but in the low load region, the amount of rotation of the movable blade portion 61 is relatively large, thereby suppressing an increase in the time required to complete cutting of the wire W.

[0183] When the movable member 75 moves forward as indicated by the arrow A1 to a position where the movable blade portion 61 finishes cutting the second wire W, the cam 90 rotates around the axis 90a as a fulcrum, and the third range 92c of the cam groove 92 intersects with the guide portion 10b, as shown in Figure 7G.

[0184] While the third range 92c of the cam groove 92 intersects with the guide portion 10b, the length from the axis 90a to the intersection of the cam groove 92 with the guide portion 10b is approximately the same as while the second range 92b intersects with the guide portion 10b, and the change in the length between the axis 90a and the cam groove 92 is even smaller and remains approximately constant.

[0185] This further reduces the amount of rotation of the movable blade unit 61 relative to the amount of movement of the sleeve 71. Once cutting of the wire W is complete, there is no need to rotate the movable blade unit 61. On the other hand, after cutting of the wire W, the sleeve 71 needs to be moved forward as indicated by arrow A1 in order to bend the wire W.

[0186] Therefore, while the third range 92c in the cam groove 92 intersects with the guide portion 10b, the amount of rotation of the movable blade portion 61 is reduced relative to the amount of movement of the sleeve 71, and the increase in load caused by the rotation of the movable blade portion 61 after cutting the wire W is suppressed, thereby suppressing the increase in load applied to the cam 90 connected to the movable blade portion 61 via the link 91.

[0187] Therefore, in the region from when the cutting of the second wire W is completed to when the movement of the sleeve 71 is stopped, the rotation of the movable blade portion 61 suppresses the increase in the load on the cam 90, thereby suppressing the increase in the load on the rotating shaft 72 that moves the sleeve 71 and the motor 80 that is connected to the rotating shaft 72 via a reducer 81.

[0188] The amount of movement of the sleeve 71 per rotation of the rotary shaft 72 is determined by the lead angle of the feed screw 72a. Therefore, the lead angle of the feed screw 72a is made larger than in conventional rebar binding machines. Meanwhile, in areas where the load on the movable blade unit 61 is high, the amount of rotation of the movable blade unit 61 is relatively small, but the force that the movable blade unit 61 can generate is increased, and in areas where the load on the movable blade unit 61 is low, the amount of rotation of the movable blade unit 61 is relatively large. This makes it possible to prevent the time required to complete cutting of the wire W from becoming longer, and also shortens the time required for the entire binding operation compared to conventional machines.

[0189] Furthermore, when cutting a wire W with a circular cross section, the load is highest when the blade reaches the diameter position and immediately before the wire is cut. Therefore, in a configuration for cutting two parallel wires W, a phase difference is provided in the timing for starting to cut the wires W. First, cutting of the first wire W begins, and then, when this wire W is cut to a position more than halfway in the radial direction, cutting of the second wire W begins.

[0190] Cutting one wire W reduces the load compared to simultaneously cutting two parallel wires W. This reduces the load by starting to cut one wire W first. Also, even when cutting two wires W, the load is reduced by starting to cut the second wire W after the first wire W has been cut to a position more than halfway in the radial direction and has passed the position where the load is greatest. Furthermore, by starting to cut the second wire W before the first wire W has been cut completely, the increase in the time required for cutting is suppressed.

[0191] Furthermore, when the wire W wound around the reinforcing bar S is cut, the sleeve 71 moves forward as indicated by the arrow A1, and as shown in Figure 3C, when the opening / closing pin 71a moves to a range where it is positioned at the release portion 73c of the opening / closing guide hole 73L, the second side hook 70L becomes able to move in a direction away from the center hook 70C by a predetermined amount.

[0192] As described above, when feeding the wire W in the reverse direction and winding it around the rebar S, the tip of the wire W needs to be locked in a manner that prevents it from slipping out from between the second side hook 70L and the center hook 70C. In response to this, a reaction force to the force of the second side hook 70L pressing the wire W against the center hook 70C is applied to the sleeve 71, and this reaction force becomes a load on the rotating shaft 72 that moves and rotates the sleeve 71 and on the motor 80 that is connected to the rotating shaft 72 via a reducer 81.

[0193] Therefore, the second side hook 70L has an engaging portion 73b and an unlocking portion 73c in the opening / closing guide hole 73L, and when winding the wire W around the rebar S, the sleeve 71 is moved to a position where the opening / closing pin 71a faces the engaging portion 73b of the opening / closing guide hole 73L, and after winding the wire W around the rebar S, the sleeve 71 is moved to a position where the opening / closing pin 71a faces the unlocking portion 73c of the opening / closing guide hole 73L.

[0194] As a result, during the operation of winding the wire W around the rebar S, the tip end of the wire W can be locked in a manner that prevents it from slipping out from between the second side hook 70L and the center hook 70C. Furthermore, after winding the wire W around the rebar 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 second side hook 70L pressing the wire W against the center hook 70C and reducing the load on the motor 80.

[0195] By driving the motor 80 in the forward rotation direction, the sleeve 71 is moved forward as indicated by the arrow A1, and as described above, the wire W is cut, and at almost the same time, the bending portions 71c1 and 71c2 move in a direction approaching the rebar S. As a result, the tip side of the wire W, which is held by the center hook 70C and the second side hook 70L, is pressed toward the rebar S by the bending portion 71c1, and is bent toward the rebar S using the holding position as a fulcrum. As the sleeve 71 moves further forward, the wire W, which is held between the second side hook 70L and the center hook 70C, is held in a state where it is sandwiched by the bending portion 71c1.

[0196] Furthermore, the end of the wire W that is engaged between the center hook 70C and the first side hook 70R and cut by the cutting portion 6 is pressed toward the rebar S by the bending portion 71c2 and bent toward the rebar S using the engagement position as a fulcrum. As the sleeve 71 moves further forward, the wire W that is engaged between the first side hook 70R and the center hook 70C is held in a state where it is sandwiched by the bending portion 71c2.

[0197] After the tip end and the cut end of the wire W are bent toward the rebar S, the motor 80 is further driven in the forward rotation direction, causing the sleeve 71 to move further forward. When the sleeve 71 moves to a predetermined position and reaches the operating range for twisting the wire W locked by the locking member 70, the locking of the rotation restricting blade 74a is released.

[0198] As a result, the motor 80 is further driven in the forward rotation direction, which causes the sleeve 71 to rotate in conjunction with the rotary shaft 72, and the wire W locked by the locking member 70 is twisted.

[0199] In the second operating range of the binding unit 7, the wire W locked by the locking member 70 is twisted, and as a result, a force is applied to the sleeve 71 that pulls it forward along the axial direction of the rotating shaft 72. In contrast, when a force is applied to move the sleeve 71 forward along the axial direction, the rotating shaft 72 moves forward while being pushed backward by the spring 72c, and twists the wire W as it moves forward.

[0200] Therefore, the wire W is twisted while moving forward with the locking member 70, sleeve 71, and rotating shaft 72 receiving the force of being pushed backward by the spring 72c, thereby reducing the gap between the twisted part of the wire W and the reinforcing bar S, and the wire W comes into close contact with the reinforcing bar S in a manner that conforms to the reinforcing bar S. This removes any slack in the wire W before twisting, and allows the wire W to be bound in a state where it is in close contact with the reinforcing bar S.

[0201] When it is detected that the load on the motor 80 has reached a maximum due to twisting the wire W, the forward rotation of the motor 80 is stopped. Next, the motor 80 is driven in the reverse direction, causing the rotating shaft 72 to rotate reversely. When the sleeve 71 rotates reversely following the reverse rotation of the rotating shaft 72, the rotation restricting blade 74a is engaged, restricting the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72. As a result, the sleeve 71 moves backward, in the direction of arrow A2.

[0202] When the sleeve 71 moves rearward, the bent portions 71c1 and 71c2 move away from the wire W, and the retention of the wire W by the bent portions 71c1 and 71c2 is released. Furthermore, when the sleeve 71 moves rearward, the open-close pin 71a passes through the open-close guide holes 73R and 73L. As a result, the first side hook 70R rotates about the shaft 71b as a fulcrum and moves in a direction away from the center hook 70C. Furthermore, the second side hook 70L rotates about the shaft 71b as a fulcrum and moves in a direction away from the center hook 70C. This causes the wire W to come out of the locking member 70.

[0203] 3D to 3F, by providing the opening / closing guide hole 73L with a second locking portion 73d, when the sleeve 71 moves further forward to a position where the wire W can be twisted, the opening / closing pin 71a is positioned at the second locking portion 73d of the opening / closing guide hole 73L. This prevents the wire W from slipping out from between the second side hook 70L and the center hook 70C even if a force twisting the wire W is applied to the wire W.

[0204] Modifications of the transmission part 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 cross-sectional views showing a modified example of the transmission unit of this embodiment.Next, with reference to each figure, we will explain the transmission unit 9B of this modified example of the present embodiment.

[0205] The transmission unit 9B includes a cutter lever 95 that rotates with the operation of the binding unit 7, and a link 91 that connects the cutter lever 95 to the movable blade unit 61. The transmission unit 9B transmits the operation of the binding unit 7 to the movable blade unit 61 of the cutting unit 6 via the cutter lever 95 and the link 91.

[0206] In the transmission unit 9B, a cutter lever 95 is supported rotatably around a shaft 90b. The shaft 90b is attached to a frame 10a attached to the inside of the main body 10.

[0207] The cutter lever 95 is an example of a displacement member, and includes a first cutter lever 95a and a second cutter lever 95b that are connected to the sleeve 71 via the moving member 75. The first cutter lever 95a engages with a first engagement portion 75b provided on the moving member 75, and the second cutter lever 95b engages with a second engagement portion 75c provided on the moving member 75.

[0208] The cutter lever 95 serves as a second connecting portion connected to the sleeve 71, and the length from the point of application where the movable member 75, which moves in conjunction with the sleeve 71, presses the shaft 90b is different between the first cutter lever 95a and the second cutter lever 95b. The length from the shaft 90b to the point of application where the movable member 75 presses the second cutter lever 95b is longer than the first cutter lever 95a.

[0209] In other words, the length from the second engagement portion 75c, which is the point of action at which the moving member 75 presses the second cutter lever 95b, to the shaft 90b is longer than the length from the first engagement portion 75b, which is the point of action at which the moving member 75 presses the first cutter lever 95a, to the shaft 90b.

[0210] When the movable member 75 moves forward in conjunction with the sleeve 71 moving forward in the direction indicated by arrow A1, first, the first engaging portion 75b engages with the first cutter lever 95a. When the sleeve 71 further moves forward in the direction indicated by arrow A1, the second engaging portion 75c engages with the second cutter lever 95b. Then, the engagement between the first cutter lever 95a and the first engaging portion 75b is released.

[0211] The link 91 has a front end portion indicated by an arrow A1 connected to the movable blade portion 61, and a rear end portion indicated by an arrow A2 connected to the cutter lever 95.

[0212] Next, the operation of the transmission unit 9B will be described. When the sleeve 71 moves forward as indicated by the arrow A1, the moving member 75 moves forward as indicated by the arrow A1 in conjunction with the sleeve 71. As the moving member 75 moves forward as indicated by the arrow A1, the first engaging portion 75b engages with the first cutter lever 95a, as shown in FIG. 9B.

[0213] When the movable member 75 moves further forward as indicated by arrow A1, the cutter lever 95 rotates in the direction of arrow C1 around the shaft 90b as a fulcrum at a ratio corresponding to the length from the shaft 90b to the point of action where the first cutter lever 95a is pressed by the first engagement portion 75b of the movable member 75 relative to the amount of movement of the sleeve 71.

[0214] When the cutter lever 95 rotates in the direction of arrow C1, the rotation of the cutter lever 95 is transmitted to the movable blade unit 61 via the link 91, causing the movable blade unit 61 to rotate in the direction of arrow D1. Therefore, the forward movement of the sleeve 71 causes the movable blade unit 61 to rotate in the direction of arrow D1, and cutting of the wire W begins.

[0215] When the sleeve 71 further moves forward as indicated by arrow A1, the second engagement portion 75c of the moving member 75 engages with the second cutter lever 95b, as shown in Fig. 8C. As a result, the cutter lever 95 rotates in the direction of arrow C1 around the shaft 90b as a fulcrum at a ratio corresponding to the length from the shaft 90b to the point of action where the second cutter lever 95b is pressed by the second engagement portion 75c of the moving member 75, relative to the amount of movement of the sleeve 71. In addition, the engagement between the first cutter lever 95a and the first engagement portion 75b is released.

[0216] While the first cutter lever 95a and the first engaging portion 75b are engaged, the movable blade unit 61 in the cutting unit 6 starts to rotate, and this is the period from when cutting of the first wire W begins to occur until cutting of the first wire W is started. Meanwhile, while the second cutter lever 95b and the second engaging portion 75c are engaged, the movable blade unit 61 in the cutting unit 6 continues to rotate, and this is the period from when cutting of the first wire W begins to occur until cutting of the second wire W is completed.

[0217] In the cutter lever 95, the length from the shaft 90b to the point of action where the movable member 75 presses the second cutter lever 95b is longer than that of the first cutter lever 95a. As a result, while the first cutter lever 95a and the first engagement portion 75b are engaged with each other, the amount of rotation of the movable blade unit 61 becomes relatively greater than the amount of movement of the sleeve 71 that rotates the cutter lever 95.

[0218] On the other hand, while the first cutter lever 95a and the first engagement portion 75b are engaged, cutting of the wire W has not started, so the increase in the load on the movable blade portion 61 is suppressed, and the increase in the load on the cutter lever 95 connected to the movable blade portion 61 via the link 91 is suppressed.

[0219] Since the cutter lever 95 is connected to the sleeve 71 via the moving member 75, the increase in the load on the cutter lever 95 is suppressed, thereby suppressing the increase in the load on the rotating shaft 72 that moves the sleeve 71 and the motor 80 that is connected to the rotating shaft 72 via a reducer 81.

[0220] Therefore, in the low load region until cutting of the first wire W begins, the amount of rotation of the movable blade portion 61 is relatively increased, thereby shortening the time it takes to rotate the movable blade portion 61 to the position where cutting of the wire W begins.

[0221] While the second cutter lever 95b and the second engagement portion 75c are engaged, the amount of rotation of the movable blade unit 61 is relatively small compared to the amount of movement of the sleeve 71 that rotates the cutter lever 95. On the other hand, the length from the shaft 90b to the point of action where the movable member 75 presses the second cutter lever 95b is longer than that of the first cutter lever 95a, so the force that can be generated by the cutter lever 95 on the movable blade unit 61 via the link 91 increases.

[0222] When cutting of the first wire W begins, the load applied to the movable blade portion 61 increases. On the other hand, the load applied to the movable blade portion 61 is canceled out by the increase in the force that the movable blade portion 61 can generate, and the increase in the load applied to the cutter lever 95 connected to the movable blade portion 61 via the link 91 is suppressed.

[0223] By suppressing the increase in the load on the cutter lever 95, the increase in the load on 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 is suppressed.

[0224] Therefore, in the high load region from when cutting of the first wire W begins until cutting of the second wire W is completed, the force that can be generated by the movable blade portion 61 can be increased, thereby suppressing an increase in the load on the motor 80. Furthermore, in the high load region, the amount of rotation of the movable blade portion 61 becomes relatively small, but in the low load region, the amount of rotation of the movable blade portion 61 is relatively large, thereby suppressing an increase in the time required to complete cutting of the wire W.

[0225] In the above embodiment, the rotation of the cutter lever 95 around the shaft 90b as a fulcrum switches between engaging the first engagement portion 75b of the movable member 75 with the first cutter lever 95a and engaging the second engagement portion 75c of the movable member 75 with the second cutter lever 95b, thereby allowing the length of the cutter lever 95 from the shaft 90b to the first connection portion that connects to the sleeve 71 to be switched.

[0226] As a result, the cutter lever 95 allows the amount of rotation (amount of movement) of the movable blade portion 61 and the force that can be generated by the movable blade portion 61 to be switched within the rotation range (movement range) of the movable blade portion 61.

[0227] In contrast to this, the cutter lever 95 may be configured so that the part to which the link 91 is connected can be switched by rotating it around the axis 90b as a fulcrum, thereby switching the length from the axis 90b to the second connecting part to which the link 91 is connected. [Explanation of symbols]

[0228] 1A Rebar tying machine, 10 Main body, 2 Magazine, 3 Wire feed section, 30 Feed gear, 5 Curl forming section, 50 Curl guide, 51 Guiding guide, 52 Guide groove, 53a First guide member, 53b Second guide member, 54 Retraction mechanism, 54a Shaft, 54b Opening / closing restriction section, 55 Frame, 55a Opening / closing restriction member, 56 Biasing member, 57 Guiding section, 58 Wire guide section, 59 Feed restriction section, 6 Cutting section, 60 Fixed blade portion (blade portion), 60a, opening, 60b, first abutment portion (one abutment portion), 60c, second abutment portion (another abutment portion), 60d, step portion, 60e, restricting portion, 61, movable blade portion (blade portion), 62a, 62b, wall portion, 7, binding portion, 70, locking member, 70R, first side hook, 70L, second side hook, 70C, center hook, 71, sleeve, 71a, opening / closing pin, 72, rotating shaft, 72a, feed screw, 73R, 73L, 7. Opening and closing guide hole, 73a opening and closing portion, 73b locking portion, first locking portion, 73c unlocking portion, 73d second locking portion, 74 rotation restricting portion, 74a rotation restricting blade, 75 moving member, 75a engaging portion, 75b first engaging portion, 75c second engaging portion, 8 driving portion, 80 motor, 81 reducer, 82a first sun gear, 82b second sun gear, 83a first planetary gear, 83b second planetary gear, 84a first planetary gear Planet cage, 84b... second planet cage, 85... internal gear, 86... bearing, 87... support member, 88... gear holder, 9... transmission part, 90... cam (displacement member), 90a, 90b... shaft, 91... link (transmission member), 92... cam groove, 92a... first region, 92b... second region, 92c... third region, 93... engaged part, 95... cutter lever (displacement member), 95a... first cutter lever, 95b... second cutter lever, W... wire

Claims

1. a wire feeding unit that feeds the wire; a curl forming section that forms a path for winding the wire fed by the wire feeding section around the bundle; a cutting unit that cuts the wire wound around the bundle; a bundling section that is wound around a bundling object and twists the wire cut by the cutting section; a transmission unit that transmits the movement of the binding unit to the cutting unit, The bundling unit includes a locking member that locks the wire, a sleeve that actuates the locking member, and a rotating shaft that actuates the sleeve, the transmission unit includes a displacement member that is displaced by movement of the sleeve, and a transmission member that transmits the movement of the displacement member to the cutting unit, the cutting unit includes a movable blade unit connected to the transmission member, The displacement member rotates around a shaft as a fulcrum, The length from the shaft to the first connecting portion that is connected to the transmission member or the length from the shaft to the second connecting portion that is connected to the sleeve is switched by a rotational movement around the shaft as a fulcrum, and the amount of movement of the movable blade unit and the force that can be generated by the movable blade unit are switched within the movement range of the movable blade unit. Binding machine.

2. The displacement member switches the amount of movement of the movable blade and the force that the movable blade can generate in accordance with the region where cutting of the wire starts within the movement range of the movable blade. The binding machine according to claim 1 .

3. a wire feeding unit that feeds the wire; a curl forming section that forms a path for winding the wire fed by the wire feeding section around the bundle; a cutting unit that cuts the wire wound around the bundle; a bundling section that is wound around a bundling object and twists the wire cut by the cutting section; a transmission unit that transmits the movement of the binding unit to the cutting unit, The bundling unit includes a locking member that locks the wire, a sleeve that actuates the locking member, and a rotating shaft that actuates the sleeve, the transmission unit includes a displacement member that is displaced by movement of the sleeve, and a transmission member that transmits the movement of the displacement member to the cutting unit, the cutting unit includes a movable blade unit connected to the transmission member, The displacement member rotates around a shaft as a fulcrum, The length from the shaft to the first connecting portion connected to the transmission member or the length from the shaft to the second connecting portion connected to the sleeve is switched by a rotational movement around the shaft as a fulcrum, and the movement amount of the movable blade unit relative to the movement amount of the sleeve is switched within the movement range of the movable blade unit. Binding machine.

4. The displacement member includes a cam that rotates around an axis as a fulcrum, The cam has a cam groove whose length from the shaft changes along the circumferential direction of rotation around the shaft, The first connecting portion where the cam is connected to the transmission member or the second connecting portion where the cam is connected to the sleeve moves along the locus of the cam groove which is displaced by the rotational movement of the cam. The binding machine according to any one of claims 1 to 3.

5. The displacement member includes a lever that rotates around an axis as a fulcrum, The lever has a plurality of connected parts having different lengths from the shaft, The first connecting portion where the lever is connected to the transmission member or the second connecting portion where the lever is connected to the sleeve is The lever can be rotated to switch from one connected part to another connected part. The binding machine according to any one of claims 1 to 3.

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