End Machine

Abstract

To provide a binding machine capable of smoothing a time required for a binding operation while suppressing a load applied to a motor and heat generation of the motor.SOLUTION: A reinforcing bar binding machine includes a limiting circuit 100 that cuts off and restores energization to a motor 80 and a feed motor 31 in accordance with a battery voltage. The limiting circuit 100 includes: a current detection circuit 103 for detecting a current flowing through the motor 80 and the feed motor 31; a comparator unit 104 for outputting a cutoff signal Sg2 when a motor current value Va flowing through the motor 80 detected by the current detection circuit 103 or the motor current value Va flowing through the feed motor 31 becomes equal to or greater than a current limit threshold value Vr; and a gate driver 105 for cutting off a gate signal Sg1 output from a microcomputer 101 when a cutoff signal Sg2 is input from the comparator unit 104, wherein a current flowing from a battery 15 to the motor 80 and the feed motor 31 is cut off.SELECTED DRAWING: Figure 8B

Description

[Technical Field]

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

[0002] Steel bars are used in concrete structures to increase their strength, and are tied together with wire to prevent the bars from shifting from their designated 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] In such rebar tying machines, a technology has been proposed in which a cooling fan is placed on the back side of the motor that drives the twisting section that twists the wire, and a power circuit board equipped with a heat-sensitive element is placed near the motor.Based on the temperature detected by the heat-sensitive element, the cooling fan is started when the internal temperature is above a reference value, allowing both the motor and the power circuit board to be cooled, thereby controlling the temperature of the rebar tying machine within an appropriate range and enabling long-term continuous operation (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-127134 Summary of the Invention [Problem to be solved by the invention]

[0006] After charging, the battery voltage (battery voltage) drops as the bundling operation is performed. Therefore, the number of rotations (rotation speed) of the motor is relatively high immediately after charging the battery, and as the bundling operation is performed, the voltage drops and the number of rotations (rotation speed) of the motor becomes relatively low.

[0007] When the rotational speed of the motor is relatively high, the time required for the series of operations to bind the objects with the wire is shortened. However, the load on the motor 8 increases, and the amount of heat generated by the motor also increases.

[0008] On the other hand, when the motor rotation speed is relatively low, the load is reduced and heat generation is suppressed, but the time required for the bundling operation increases. For this reason, you will notice a difference in the time required for the bundling operation immediately after charging the battery and after performing the bundling operation a certain number of times.

[0009] The present invention has been made to solve such problems, and aims to provide a binding machine that can smooth out the time required for binding operations while suppressing the load on the motor and the heat generated by the motor. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the present invention provides a wire feeder including a wire feeding unit that feeds a wire, a cutting unit that cuts the wire wound around a bundle, a bundling unit that twists the wire wound around the bundle and cut by the cutting unit, and at least one motor that drives one or more of the wire feed unit, the cutting unit, and the bundling unit. Battery voltage drops when current flows through the motor Battery It is possible to generate a threshold value that is a criterion for determining whether or not it is necessary to limit the current flowing through the motor, and the battery Current flows to the motor from Ward In the section where the current flowing to the motor is small, the current flowing to the motor depends on the battery voltage in the section where the current flowing to the motor is large. The current is calculated based on the value and the threshold. Limit And the number of bundling operations can be counted. Equipped with a control unit The control unit sets the threshold value based on the number of bundling operations. It is a binding machine.

[0011] In the present invention, in a section where a large amount of current flows through the motor, the current flowing through the motor is temporarily limited in accordance with the battery voltage. [Effects of the Invention]

[0012] According to the present invention, by controlling the motor according to the battery voltage, the time required for the series of operations to bind the objects with wire can be shortened while suppressing an increase in load and heat generation, and can be smoothed out regardless of increases or decreases in battery voltage. [Brief explanation of the drawings]

[0013] [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 part showing a modified example of the binding part 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] FIG. 2 is a plan view showing an example of a magazine according to the present embodiment. [Figure 7B] FIG. 2 is a perspective view showing an example of a magazine according to the present embodiment. [Figure 7C] FIG. 2 is a front cross-sectional view showing an example of a magazine according to the present embodiment. [Figure 7D] FIG. 2 is a side cross-sectional view showing an example of a magazine according to the present embodiment. [Figure 8A] FIG. 2 is a block diagram showing an example of a control function of the reinforcing bar binding machine. [Figure 8B] FIG. 10 is a block diagram showing an example of a configuration in which a function for limiting a current flowing through a motor is realized by hardware. [Figure 8C] FIG. 10 is a block diagram showing an example of a configuration in which a function for limiting a current flowing through a motor is realized by software. [Figure 9A] 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 9B]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 9C] 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 9D] 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 9E] 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 9F] 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 9G] 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 10] 10 is a flowchart illustrating an example of an operation for limiting a current flowing through a motor. [Figure 11] 10 is a graph showing the waveform of a current flowing through a motor during a reinforcing bar binding operation. [Figure 12A] FIG. 10 is a side view showing a modified example of the transmission unit of the present embodiment. [Figure 12B] FIG. 10 is a side view showing a modified example of the transmission unit of the present embodiment. [Figure 12C] FIG. 10 is a side view showing a modified example of the transmission unit of the present embodiment. [Figure 13A] FIG. 10 is a side cross-sectional view showing a modified example of the transmission portion of the present embodiment. [Figure 13B] FIG. 10 is a side cross-sectional view showing a modified example of the transmission portion of the present embodiment. [Figure 13C] 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

[0014] 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.

[0015] <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.

[0016] 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.

[0017] 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.

[0018] The reinforcing bar binding machine 1A is designed to be held by the operator and includes a main body 10 and a handle 11.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] <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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] Furthermore, the reducer 81 includes an internal gear 85 with which the first planetary gear 83a and the second planetary gear 83b mesh.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] Magazine implementation example Fig. 7A is a front view showing an example of a magazine according to this embodiment, Fig. 7B is a perspective view showing an example of a magazine according to this embodiment, Fig. 7C is a front cross-sectional view showing an example of a magazine according to this embodiment, and Fig. 7D is a side cross-sectional view showing an example of a magazine according to this embodiment. Next, an example of a magazine according to this embodiment will be described with reference to these figures.

[0137] The magazine 2 has a peripheral wall 2b erected around a side wall 2a, and is open on the side opposite the side wall 2a. The magazine 2 is equipped with an openable lid 21. The lid 21 opens and closes the opening of the magazine 2 by rotating around a hinge 21a provided on the peripheral wall 2b. The reel 20 can be attached and detached from the magazine 2 by opening the lid 21.

[0138] The magazine 2 has a separation section 22 between a storage position 20a for the reel 20, indicated by a two-dot chain line, and a feed path 20b for the wire W within the magazine 2, indicated by a dashed line. The separation section 22 protrudes from the side wall 2a of the magazine 2 along the peripheral wall 2b in the axial direction of the reel 20.

[0139] The separation unit 22 is provided in the magazine 2 on the opposite side of the feeding port 20c from which the wire W is fed, relative to the storage position 20a of the reel 20. In the magazine 2, the side opposite the feeding port 20c is a range in which the wire W is likely to bend when the wire W is fed in the reverse direction indicated by arrow R, and a range in which the bent wire W is likely to be displaced in a direction approaching the wire W wound on the reel 20 when the wire W is fed in the forward direction indicated by arrow F. Thus, the separation unit 22 separates the reel 20 stored in the magazine 2 from the feeding path 20b of the wire W in a range in which the bent wire W is likely to approach the reel 20 when the wire W is fed in the forward direction indicated by arrow F.

[0140] The separating unit 22 is provided with rotating members 23 at the upstream end and downstream end in the feeding direction of the wire W. The rotating members 23 have rotation axes that extend in a direction intersecting the feeding direction of the wire W, and are rotatable when the wire W being fed in the forward or reverse direction comes into contact with the rotating members 23.

[0141] The separation section 22 includes a pressing member 22a that rotatably supports the rotational member 23. The pressing member 22a is attached to a portion of the separation section 22 opposite to the side wall section 2a. One side of the rotational member 23 along the axial direction is rotatably supported by the side wall section 2a, and the other side of the rotational member 23 is rotatably supported by the pressing member 22a.

[0142] Separation section 22 has a support recess 22b that is supported by lid section 21. Lid section 21 also has a support protrusion 21b that supports separation section 22. Support recess 22b is an example of a support section, and is configured by providing a recess of a predetermined shape in pressing member 22a that faces closed lid section 21. Support protrusion 21b is an example of a support section, and is configured by providing a protrusion of a predetermined shape that fits removably into support recess 22b of separation section 22 when lid section 21 is closed. Note that a configuration may be adopted in which separation section 22 has a support protrusion, and lid section 21 has a support recess. Alternatively, a configuration may be adopted in which separation section 22 has a support protrusion and a support recess, and lid section 21 has a support recess and a support protrusion that correspond to the support protrusion and support recess of separation section 22.

[0143] The magazine 2 has an escape portion 24 for the wire W upstream of the separation portion 22 with respect to the forward feeding direction of the wire W indicated by the arrow F. The escape portion 24 is configured by providing a space between the peripheral wall 2b and the reel 20 accommodated in the accommodation position 20a, with a predetermined length between the outer circumferential position of the accommodation position 20a of the reel 20 and the reel 20 accommodated in the accommodation position 20a, allowing the wire W to bend when the wire W is fed in the reverse direction indicated by the arrow R.

[0144] The length of the escape portion 24 gradually increases from the outer peripheral position of the storage position 20a of the reel 20 along the forward feed direction of the wire W indicated by the arrow F, and the starting position 24a of the wall portion of the escape portion 24 is connected to the peripheral wall portion 2b by an arc.

[0145] The magazine 2 is provided with a buckling prevention portion 21c in the feed path 20b of the wire W. The buckling prevention portion 21c is provided on the lid portion 21, and when the lid portion 21 is closed, the buckling prevention portion 21c is exposed to the feed path 20b of the wire W between the outer periphery of the storage position 20a and the feed opening 20c. The buckling prevention portion 21c is composed of a columnar or cylindrical member, roller, or the like made of a material with a low coefficient of friction, and when the wire W fed mainly in the reverse direction indicated by the arrow R comes into contact with the buckling prevention portion 21c, it prevents the wire W from buckling by preventing the wire W from being fed due to friction.

[0146] The magazine 2 has a guide wall 2c at the feed opening 20c. The guide wall 2c is connected to the peripheral wall 2b and is configured by providing a surface that stands upright along the feed direction of the wire W on the rear side of the feed opening 20c.

[0147] The magazine 2 has an intrusion restriction recess 2d and an intrusion restriction protrusion 21d that restrict the wire W from entering between the lid 21 and the peripheral wall 2b. The intrusion restriction recess 2d is an example of an intrusion restriction portion, and is configured by providing a recess of a predetermined shape on the peripheral wall 2b that faces the closed lid 21. The intrusion restriction protrusion 21d is an example of an intrusion restriction portion, and is configured by providing a protrusion of a predetermined shape that fits removably into the intrusion restriction recess 2d on the peripheral wall 2b when the lid 21 is closed. Note that the intrusion restriction protrusion may be provided on the peripheral wall 2b, and the intrusion restriction recess may be provided on the lid 21. Alternatively, the intrusion restriction protrusion and intrusion restriction recess may be provided on the peripheral wall 2b, and the intrusion restriction recess and intrusion restriction protrusion may be provided on the lid 21 corresponding to the intrusion restriction protrusion and intrusion restriction recess on the peripheral wall 2b.

[0148] The separating portion 22 has a guide protrusion 22c that prevents the wire W from entering between the pressing member 22b and the rotating member 23. The guide protrusion 22c is provided corresponding to the rotating member 23 located upstream with respect to the forward feed direction of the wire W indicated by the arrow F, and is configured by providing a protrusion that protrudes from the pressing member 22b along the circumferential surface near one end of the rotating member 23 in the axial direction.

[0149] Example of control unit 8A is a block diagram showing an example of the control function of the reinforcing bar binding machine. In the reinforcing bar binding machine 1A, the control unit 14 controls the motor 80 and the feed motor 31 in accordance with the state of the operation switch 13 pressed by operating the trigger 12 shown in FIG. 1, and executes a series of operations to bind the reinforcing bars S with the wire W.

[0150] After charging, the voltage (battery voltage) of the battery 15 decreases as the operation of binding the reinforcing bars S with the wire W is performed. Therefore, immediately after charging the battery 15, the number of rotations (rotational speed) of the motor 80, etc. becomes relatively high, and as the binding operation is performed, the voltage decreases, and the number of rotations (rotational speed) of the motor 80, etc. becomes relatively low.

[0151] When the rotational speed (rotational speed) of the motor 80 etc. is relatively high, the time required for the series of operations to bind the reinforcing bars S with the wire W is shortened. However, the load on the object to be driven by the motor 80 etc. increases, and the amount of heat generated by the motor 80 etc. also increases.

[0152] On the other hand, when the rotational speed (rotational speed) of the motor 80 or the like becomes relatively low, the load is reduced, but the time required for the series of operations to bind the reinforcing bars S with the wire W increases. For this reason, a difference in the time required for the series of operations to bind the reinforcing bars S with the wire W is felt immediately after charging the battery 15 and after performing the binding operations a certain number of times.

[0153] Therefore, the rebar binding machine 1A controls the motor 80 and the feed motor 31 according to the voltage (battery voltage) of the battery 15, shortening the time required for the series of operations to bind the rebar S with the wire W while suppressing an increase in load and heat generation, and smoothing the time regardless of increases or decreases in the battery voltage.

[0154] The rebar binding machine 1A realizes control to limit the current flowing through the motor 80 and the feed motor 31 by hardware or software, as an example of control of the motor 80 and the feed motor 31 according to the battery voltage.

[0155] 8B is a block diagram showing an example of a configuration in which the function of limiting the current flowing to the motor is realized by hardware. In the rebar binding machine 1A, the control unit 14 includes a limiting circuit 100 that cuts off and restores power to the motor 80 and the feed motor 31 in accordance with the battery voltage, in order to realize the control that limits the current flowing to the motor 80 and the feed motor 31 by hardware in accordance with the battery voltage.

[0156] The control unit 14 also includes a microcomputer 101 that controls the motor 80 and the feed motor 31, and a motor driver 102 that supplies current from the battery 15 to the motor 80 and the feed motor 31 in accordance with the control of the microcomputer 101, thereby driving the motor 80 and the feed motor 31. The motor 80 and the feed motor 31 are controlled and driven by an independent limiting circuit 100 and motor driver 102.

[0157] The microcomputer 101 outputs a gate signal Sg1 at a predetermined timing to drive the motor 80 and the feed motor 31. When the gate signal Sg1 is input from the microcomputer 101, the motor driver 102 that drives the motor 80 passes a current from the battery 15 to the motor 80. When the gate signal Sg1 is input from the microcomputer 101, the motor driver 102 that drives the feed motor 31 passes a current from the battery 15 to the feed motor 31.

[0158] The limiting circuit 100 includes a current detection circuit 103 that detects the battery voltage from the current flowing through the motor 80 and the feed motor 31. The current detection circuit 103 includes a shunt resistor 103a and a differential amplifier (op-amp) 103b to convert the current flowing through the motor 80 and the feed motor 31 into a voltage.

[0159] The limiting circuit 100 corresponding to the motor 80 is provided with a comparator unit 104 that outputs a signal (shut-off signal) Sg2 to cut off the current flowing to the motor 80 and the feed motor 31 depending on whether the current (motor current value) Va flowing to the motor 80 is higher or lower than a threshold (current limit threshold) Vr that serves as a criterion for determining whether or not control of the current is required.

[0160] Furthermore, the limiting circuit 100 includes a gate driver 105 that switches between driving the motor 80 and the feed motor 31 by the motor driver 102 and not driving them, depending on the output of the comparator section 104 .

[0161] The comparator unit 104 receives the motor current value Va flowing through the motor 80 detected by the current detection circuit 103 and the current limit threshold Vr generated by the threshold generation unit 104a, and outputs a cut-off signal Sg2 when the motor current value Va flowing through the motor 80 becomes equal to or greater than the current limit threshold Vr.

[0162] In addition, the comparator unit 104 receives the motor current value Va flowing through the feed motor 31 detected by the current detection circuit 103 and the current limit threshold value Vr generated by the threshold value generation unit 104a, and outputs a cut-off signal Sg2 when the motor current value Va flowing through the feed motor 31 becomes equal to or greater than the current limit threshold value Vr.

[0163] The current detection circuit 103, which is equipped with a shunt resistor 103a and an operational amplifier 103b, detects the current by converting the voltage drop across the resistor into a current value, and the comparator unit 104 compares the motor current value Va with the current limit threshold Vr based on the magnitude of the voltage, which is equivalent to detecting the current.

[0164] The gate driver 105 is provided between the microcomputer 101 and the motor driver 102, and inputs the gate signal Sg1 output from the microcomputer 101 to the motor driver 102 when the shutoff signal Sg2 is not input from the comparator unit 104.

[0165] As a result, in the limiting circuit 100 corresponding to the motor 80, current flows from the battery 15 to the motor 80, causing the motor 80 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage. Also, in the limiting circuit 100 corresponding to the feed motor 31, current flows from the battery 15 to the feed motor 31, causing the feed motor 31 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage.

[0166] In response to this, when the cutoff signal Sg2 is input from the comparator unit 104, the gate driver 105 cuts off the gate signal Sg1 output from the microcomputer 101 and does not input it to the motor driver 102. When the gate signal Sg1 is not input, the motor driver 102 cuts off the current flowing from the battery 15 to the motor 80 and the feed motor 31.

[0167] As a result, the limiting circuit 100 corresponding to the motor 80 cuts off the current flowing from the battery 15 to the motor 80, causing the motor 80 to rotate by inertia. In this case, the number of rotations (rotational speed) of the motor 80 decreases compared to when the motor is driven by battery voltage. Also, the limiting circuit 100 corresponding to the feed motor 31 cuts off the current flowing from the battery 15 to the feed motor 31, causing the feed motor 31 to rotate by inertia. In this case, the number of rotations (rotational speed) of the feed motor 31 decreases compared to when the motor is driven by battery voltage.

[0168] The comparator unit 104 stops outputting the cutoff signal Sg2 when the limit release signal Sg3 is input from the microcomputer 101. The comparator unit 104 may also stop outputting the cutoff signal Sg2 when the motor current value Va flowing through the feed motor 31 becomes less than the current limit threshold Vr.

[0169] When the comparator unit 104 stops outputting the cutoff signal Sg2, the gate driver 105 cancels the cutoff of the gate signal Sg1 output from the microcomputer 101 and inputs the gate signal Sg1 to the motor driver .

[0170] As a result, in the limiting circuit 100 corresponding to the motor 80, current flows from the battery 15 to the motor 80, causing the motor 80 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage. Also, in the limiting circuit 100 corresponding to the feed motor 31, current flows from the battery 15 to the feed motor 31, causing the feed motor 31 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage.

[0171] Therefore, when the motor current value Va becomes equal to or greater than the current limit threshold Vr, the current flowing to the motor 80 and the feed motor 31 is cut off, and when the battery voltage is equal to or greater than a predetermined threshold, the current flowing to the motor 80 and the feed motor 31 is limited to temporarily reduce the number of rotations (rotational speed).

[0172] The limiting circuit 100 includes a limit value variable parallel resistor 106 that changes the criteria for determining whether or not it is necessary to limit the current flowing through the motor 80 and the feed motor 31. In this example, the limit value variable parallel resistor 106 is provided between the output of the current detection circuit 103 and the input of the comparator unit 104, and the resistance value is made variable by a limit value control signal Sg4 from the microcomputer 101, thereby switching between high and low voltages input to the comparator unit 104.

[0173] This causes the current limit threshold Vr to change relative to the motor current value Va input to the comparator unit 104, changing the criteria for determining whether or not to limit the current flowing through the motor 80 and the feed motor 31, making it possible to lower the current limit threshold so that the current value at which the limit is applied becomes higher, or to raise the current limit threshold so that the current value at which the limit is applied becomes lower. Note that a limit value varying parallel resistor 106 may be provided between the threshold generation unit 104a and the input of the comparator unit 104 to change the level of the current limit threshold Vr.

[0174] The control unit 14 is configured with the above-mentioned components as one integrated circuit or multiple integrated circuits, etc., and is mounted on a board, so that a limiting circuit 100 that limits the current flowing to the motor 80 and the feed motor 31 is configured as hardware, as an example of controlling the motor 80 and the feed motor 31 according to the battery voltage.

[0175] 8C is a block diagram showing an example of a configuration in which the function of limiting the current flowing to the motor is realized by software. In rebar binding machine 1A, in order to realize by software the control to limit the current flowing to motor 80 and feed motor 31 in accordance with the battery voltage, control unit 14 includes microcomputer 101 that controls motor 80 and feed motor 31 in accordance with the battery voltage, and motor driver 102 that flows current from battery 15 to motor 80 and feed motor 31 in accordance with the control of microcomputer 101, thereby driving motor 80 and feed motor 31.

[0176] The microcomputer 101 outputs a gate signal Sg1 at a predetermined timing to drive the motor 80 and the feed motor 31. When the gate signal Sg1 is input from the microcomputer 101, the motor driver 102 that drives the motor 80 passes a current from the battery 15 to the motor 80. When the gate signal Sg1 is input from the microcomputer 101, the motor driver 102 that drives the feed motor 31 passes a current from the battery 15 to the feed motor 31.

[0177] The control unit 14 includes a current detection circuit 103 that detects the battery voltage from the current flowing through the motor 80 and the feed motor 31. The current detection circuit 103 converts the current flowing through the motor 80 and the feed motor 31 into a voltage, and includes a resistor (shunt resistor) 103a that drops the voltage, and a differential amplifier (op-amp) 103b that amplifies the voltage by the amount of the drop.

[0178] The control unit 14 also includes a gate driver 105 that switches between driving and not driving the motor 80 and the feed motor 31 by the motor driver 102 in accordance with the output of the microcomputer 101 .

[0179] The microcomputer 101 acquires the current (motor current value) Va flowing through the motor 80 when the motor 80 is driven, and the motor current value Va flowing through the feed motor 31 when the feed motor 31 is driven.When the motor current value Va reaches or exceeds a threshold value that serves as a criterion for determining whether or not control of the current is required, the microcomputer 101 outputs a cut-off signal Sg2 that cuts off the current flowing through the motor 80 and the feed motor 31.

[0180] Furthermore, when the motor current value Va falls below a threshold value that is a criterion for determining whether or not control of the current is necessary, the microcomputer 101 outputs a limit release signal Sg3 in place of the shutoff signal Sg2. Note that the control unit 14 may output the limit release signal Sg3 after a certain time has elapsed since the output of the shutoff signal Sg2.

[0181] The gate driver 105 is provided between the microcomputer 101 and the motor driver 102, and inputs the gate signal Sg1 output from the microcomputer 101 to the motor driver 102 when the shutoff signal Sg2 is not input from the microcomputer 101.

[0182] As a result, in the limiting circuit 100 corresponding to the motor 80, current flows from the battery 15 to the motor 80, causing the motor 80 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage. Also, in the limiting circuit 100 corresponding to the feed motor 31, current flows from the battery 15 to the feed motor 31, causing the feed motor 31 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage.

[0183] In response to this, when the cutoff signal Sg2 is input from the microcomputer 101, the gate driver 105 cuts off the gate signal Sg1 output from the microcomputer 101 and does not input it to the motor driver 102. When the gate signal Sg1 is not input, the motor driver 102 cuts off the current flowing from the battery 15 to the motor 80 and the feed motor 31.

[0184] As a result, the limiting circuit 100 corresponding to the motor 80 cuts off the current flowing from the battery 15 to the motor 80, causing the motor 80 to rotate by inertia. In this case, the number of rotations (rotational speed) of the motor 80 decreases compared to when the motor is driven by battery voltage. Also, the limiting circuit 100 corresponding to the feed motor 31 cuts off the current flowing from the battery 15 to the feed motor 31, causing the feed motor 31 to rotate by inertia. In this case, the number of rotations (rotational speed) of the feed motor 31 decreases compared to when the motor is driven by battery voltage.

[0185] Furthermore, when the gate driver 105 receives the restriction release signal Sg3 from the microcomputer 101, it releases the blocking of the gate signal Sg1 output from the microcomputer 101 and inputs the gate signal Sg1 to the motor driver .

[0186] As a result, in the limiting circuit 100 corresponding to the motor 80, current flows from the battery 15 to the motor 80, causing the motor 80 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage. Also, in the limiting circuit 100 corresponding to the feed motor 31, current flows from the battery 15 to the feed motor 31, causing the feed motor 31 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage.

[0187] Therefore, when the motor current value Va exceeds the threshold value for current limitation, the current flowing to the motor 80 and the feed motor 31 is cut off, and when the battery voltage is above a predetermined threshold value, the current flowing to the motor 80 and the feed motor 31 is limited to temporarily reduce the number of rotations (rotational speed).

[0188] As an example of controlling the motor 80 and the feed motor 31 according to the battery voltage, the control unit 14 controls the motor 80 and the feed motor 31 by limiting the current flowing through the motor 80 and the feed motor 31 according to the motor current value Va, which is realized by software.

[0189] <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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] This causes the first side hook 70R and the second side hook 70L to close against the center hook 70C.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] Because the magazine 2 is not provided with a driving means for rotating the reel 20, the reel 20 rotates in response to the feeding of the wire W when the wire W is fed in the forward direction indicated by the arrow F. However, due to the sliding resistance between the magazine 2 and the reel 20, a force is applied to wind the wire W onto the reel 20, and the reel 20 rotates in response to the feeding of the wire W. On the other hand, when the feeding of the wire W in the forward direction stops, the reel 20 continues to rotate slightly due to its own inertia, and the wire W wound on the reel 20 slackens and expands in the radial direction of the reel 20.

[0206] Furthermore, when the wire W is fed in the reverse direction indicated by the arrow R, the reel 20 rotates while being pushed by the wire W, but the rotation of the reel 20 is delayed relative to the feed speed of the wire W by the wire feed unit 3.

[0207] As a result, the wire W is bent in a direction expanding along the radial direction of the reel 20 by the operation of feeding the wire W in the reverse direction indicated by arrow R. Therefore, in the magazine 2, the side opposite to the feed outlet 20c becomes a range in which, when a force is applied to wind the wire W around the reel 20 by the operation of feeding the wire W in the forward direction indicated by arrow F, the bent wire W is likely to be displaced in a direction approaching the wire W wound on the reel 20. Therefore, the magazine 2 is provided with a separation section 22 between the storage position 20a and the wire W feed path 20b, on the opposite side of the feed outlet 20c from which the wire W is fed in the magazine 2.

[0208] As a result, the separation unit 22 separates the reel 20 contained in the magazine 2 from the feed path 20b of the wire W by feeding the wire W in the positive direction indicated by the arrow F to a range that allows the bent wire W to easily approach the reel 20.

[0209] Therefore, the wire W that has been bent when sent in the reverse direction is prevented from being displaced in a direction approaching the reel 20 when it is next sent in the forward direction, and the wire W pulled out from the reel 20 is prevented from becoming entangled with the wire W wound on the reel 20.

[0210] Furthermore, the separating unit 22 is provided with rotating members 23 at the upstream and downstream ends in the feeding direction of the wire W, so that the wire W, which is fed mainly in the forward direction, comes into contact with the rotating members 23, causing the rotating members 23 to rotate. This reduces the sliding resistance when the wire W slides against the separating member 22.

[0211] Furthermore, the magazine 2 is provided with an escape portion 24 for the wire W upstream of the separation section 22 in the forward feed direction of the wire W indicated by the arrow F, thereby ensuring space in which the wire W fed in the reverse direction indicated by the arrow R can bend upstream of the separation section 22.

[0212] This allows the wire W fed in the reverse direction to bend in a direction away from the reel 20, thereby preventing the wire W unwound from the reel 20 from becoming entangled with the wire W wound on the reel 20. In particular, by providing the escape portion 24 upstream of the separating portion 22, a space is secured between the reel 20 and the peripheral wall portion 2b of the magazine 2, preventing the wire W fed in the reverse direction from hitting the peripheral wall portion 2b of the magazine 2. Therefore, when the wire W hits the peripheral wall portion 2b of the magazine 2, a load is applied, preventing the wire W from buckling in the inner diameter direction of the reel 20, and preventing the buckled wire W from becoming entangled with the wire W wound on the reel 20. Furthermore, by providing the guide wall portion 2c along the feeding direction of the wire W (direction of arrow F), the wire W in the reel 20 is prevented from expanding, preventing the wire W from becoming entangled. Furthermore, the wire W is prevented from bending upstream of the intrusion restricting recess 2d and the intrusion restricting protrusion 21d, and the bent wire W is prevented from entering between the magazine 2 and the lid portion 21.

[0213] Furthermore, when the wire W is fed in the forward direction indicated by the arrow F, the wire W comes into contact with the rotating member 23 located upstream in the feeding direction of the wire W. Therefore, the pressing member 22b is provided with a guide protrusion 22c that protrudes along the circumferential surface of the rotating member 23 near one end in the axial direction of the rotating member 23. This prevents the wire W in contact with the rotating member 23 from moving in the axial direction of the rotating member 23 and entering between the pressing member 22b and the rotating member 23.

[0214] Furthermore, when the lid portion 21 of the magazine 2 is closed, the support protrusions 21b of the lid portion 21 fit into the support recesses 22b of the separation portion 22, so that the lid portion 21 side of the separation portion 22 is supported by the closed lid portion 21. This prevents the separation portion 22 from being deformed even if a force is applied to the separation portion 22 by the wire W.

[0215] 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.

[0216] 9A to 9G are explanatory views showing an example of the operation of the binding unit, the transmission unit, and the cutting unit of this embodiment. As shown in Fig. 9A, when sleeve 71 moves forward as indicated by arrow A1, moving member 75 moves forward as indicated by arrow A1 together with sleeve 71.

[0217] 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. 9B. 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.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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. 9C is called the idling region. The idling region and idling region are regions where the load on the movable blade unit 61 is low.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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 9D.

[0230] 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.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] 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 9E, 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.

[0239] 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.

[0240] 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 9F.

[0241] 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.

[0242] 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.

[0243] 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.

[0244] 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 9G.

[0245] 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.

[0246] 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.

[0247] 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.

[0248] 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.

[0249] The amount of movement of the sleeve 71 per rotation of the rotating shaft 72 is determined by the lead angle of the feed screw 72a. Therefore, the lead angle of the feed screw 72a is made larger than that of conventional rebar binding machines. The lead angle of the feed screw 72a is preferably 8° or more and 15° or less. 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 to shorten the time required for the entire binding operation compared to conventional machines.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] Next, control for limiting the current flowing through the motor in the above-described bundling operation, which is realized by hardware, will be described with reference to FIG. 8B and other figures.

[0266] The control unit 14 outputs a gate signal Sg1 at a predetermined timing when the microcomputer 101 drives the feed motor 31 in order to feed the wire W in the forward direction to wind the wire W around the reinforcing bar S and in order to wind the wire W around the reinforcing bar S. When the gate signal Sg1 is input from the microcomputer 101, the motor driver 102 that drives the feed motor 31 passes a current from the battery 15 to the feed motor 31. This causes the feed motor 31 to rotate at a rotation speed corresponding to the battery voltage.

[0267] When the feed motor 31 rotates, the motor current value Va flowing through the feed motor 31 is detected by the current detection circuit 103. The comparator unit 104 receives the motor current value Va flowing through the feed motor 31 detected by the current detection circuit 103 and the current limit threshold value Vr generated by the threshold value generation unit 104a, and does not output the shut-off signal Sg2 if the motor current value Va flowing through the feed motor 31 is less than the current limit threshold value Vr.

[0268] If the cutoff signal Sg2 is not input from the comparator unit 104, the gate driver 105 does not cut off the gate signal Sg1 output from the microcomputer 101. As a result, the feed motor 31 continues to rotate at a rotational speed corresponding to the battery voltage.

[0269] The comparator unit 104 outputs a cutoff signal Sg2 when the motor current value Va flowing through the feed motor 31 becomes equal to or greater than the current limit threshold Vr. When the cutoff signal Sg2 is input from the comparator unit 104, the gate driver 105 cuts off the gate signal Sg1 output from the microcomputer 101 and does not input it to the motor driver 102. When the gate signal Sg1 is not input to the motor driver 102, the current flowing from the battery 15 to the feed motor 31 is cut off, and the feed motor 31 rotates by inertia. In this case, the number of rotations (rotational speed) of the feed motor 31 is reduced compared to when the feed motor 31 is driven by battery voltage.

[0270] When the limit release signal Sg3 is input from the microcomputer 101, the comparator unit 104 stops outputting the cutoff signal Sg2.

[0271] When the comparator unit 104 stops outputting the cutoff signal Sg2, the gate driver 105 cancels the cutoff of the gate signal Sg1 output from the microcomputer 101 and inputs the gate signal Sg1 to the motor driver .

[0272] As a result, current flows from the battery 15 to the feed motor 31, causing the feed motor 31 to rotate at a number of rotations (rotational speed) according to the battery voltage.

[0273] Therefore, when the motor current value Va becomes equal to or greater than the current limit threshold Vr, the current flowing to the feed motor 31 is cut off, and when the battery voltage is equal to or greater than a predetermined threshold, control is performed to limit the current flowing to the feed motor 31 and temporarily reduce the rotation speed (rotational speed).

[0274] The control unit 14 outputs a gate signal Sg1 at a predetermined timing when the microcomputer 101 drives the motor 80 during the operation of locking the wire W at the binding unit 7, the operation of cutting the wire W at the cutting unit 6, and the operation of twisting the wire W at the binding unit 7. When the gate signal Sg1 is input from the microcomputer 101, the motor driver 102 that drives the motor 80 passes a current from the battery 15 to the motor 80. This causes the motor 80 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage.

[0275] When the motor 80 rotates, the motor current value Va flowing through the motor 80 is detected by the current detection circuit 103. The motor current value Va flowing through the motor 80 detected by the current detection circuit 103 and the current limit threshold Vr generated by the threshold generation unit 104a are input to the comparator unit 104, and if the motor current value Va flowing through the motor 80 is less than the current limit threshold Vr, the comparator unit 104 does not output the shut-off signal Sg2.

[0276] If the cutoff signal Sg2 is not input from the comparator unit 104, the gate driver 105 does not cut off the gate signal Sg1 output from the microcomputer 101. As a result, the motor 80 continues to rotate at a rotational speed corresponding to the battery voltage.

[0277] The comparator unit 104 outputs a cutoff signal Sg2 when the motor current value Va flowing through the motor 80 becomes equal to or greater than the current limit threshold Vr. When the cutoff signal Sg2 is input from the comparator unit 104, the gate driver 105 cuts off the gate signal Sg1 output from the microcomputer 101 and does not input it to the motor driver 102. When the gate signal Sg1 is not input to the motor driver 102, the current flowing from the battery 15 to the motor 80 is cut off, and the motor 80 rotates by inertia. In this case, the number of rotations (rotational speed) of the motor 80 is reduced compared to when the motor 80 is driven by battery voltage.

[0278] When the limit release signal Sg3 is input from the microcomputer 101, the comparator unit 104 stops outputting the cutoff signal Sg2.

[0279] When the comparator unit 104 stops outputting the cutoff signal Sg2, the gate driver 105 cancels the cutoff of the gate signal Sg1 output from the microcomputer 101 and inputs the gate signal Sg1 to the motor driver .

[0280] As a result, current flows from the battery 15 to the motor 80, causing the motor 80 to rotate at a number of rotations (rotational speed) according to the battery voltage.

[0281] Therefore, when the motor current value Va becomes equal to or greater than the current limit threshold Vr, the current flowing to the motor 80 is cut off, and when the battery voltage is equal to or greater than a predetermined threshold, control is performed to limit the current flowing to the motor 80 and temporarily reduce the rotation speed (rotational speed).

[0282] The rebar binding machine 1A has a larger lead angle of the feed screw 72a, set to between 8° and 15°, compared to conventional rebar binding machines. The amount of movement of the sleeve 71 per rotation of the rotating shaft 72 is determined by the lead angle of the feed screw 72a, so the amount of movement of the sleeve 71 per rotation of the rotating shaft 72 in the rebar binding machine 1A is greater than in conventional rebar binding machines. Therefore, even if control is performed to temporarily reduce the number of rotations (rotational speed) by limiting the current flowing through the feed motor 31 and the motor 80 depending on the battery voltage, the time required for the series of operations to bind the rebars S with the wire W is shorter than in conventional machines while suppressing increases in load and heat generation, and the time can be smoothed regardless of increases or decreases in battery voltage.

[0283] FIG. 10 is a flowchart showing an example of an operation for limiting the current flowing through the motor. Next, we will explain the control achieved by software for limiting the current flowing through the motor during the above-mentioned bundling operation, with reference to FIGS. 8C, 10, etc.

[0284] The control unit 14 controls the microcomputer 101 to output a gate signal Sg1 at a predetermined timing to drive the feed motor 31, as shown in step SA1 of Fig. 10, during the operation of feeding the wire W in the forward direction to wind the wire W around the reinforcing bar S and the operation of winding the wire W around the reinforcing bar S. When the gate signal Sg1 is input from the microcomputer 101, the motor driver 102 that drives the feed motor 31 causes a current to flow from the battery 15 to the feed motor 31, as shown in step SA2 of Fig. 10. This causes the feed motor 31 to rotate at a rotational speed corresponding to the battery voltage.

[0285] When the feed motor 31 rotates, the motor current value Va flowing through the feed motor 31 is detected by the current detection circuit 103, as shown in step SA3 of Fig. 10. The microcomputer 101 compares the motor current value Va flowing through the feed motor 31 with a threshold value (current limit threshold) that serves as a reference for determining whether or not control of the current is necessary, as shown in step SA4 of Fig. 10, and when it determines that the motor current value Va flowing through the feed motor 31 is equal to or greater than the current limit threshold, it outputs a shut-off signal Sg2, as shown in step SA5 of Fig. 10.

[0286] When the shut-off signal Sg2 is input from the microcomputer 101, the gate driver 105 shuts off the gate signal Sg1 output from the microcomputer 101 and does not input it to the motor driver 102, as shown in step SA6 of Fig. 10. When the gate signal Sg1 is not input to the motor driver 102, the current flowing from the battery 15 to the feed motor 31 is shut off, as shown in step SA7 of Fig. 10, and the feed motor 31 rotates by inertia. In this case, the number of rotations (rotational speed) of the feed motor 31 is reduced compared to when the feed motor 31 is driven by battery voltage.

[0287] As shown in step SA8 of Fig. 10, when the microcomputer 101 determines that a certain time has elapsed since the motor current value Va became equal to or greater than the current limit threshold, it outputs a limit release signal Sg3 instead of the blocking signal Sg2 as shown in step SA9 of Fig. 10. When the limit release signal Sg3 is input from the microcomputer 101, the gate driver 105 releases the blocking of the gate signal Sg1 output from the microcomputer 101 and inputs the gate signal Sg1 to the motor driver 102 as shown in step SA10 of Fig. 10.

[0288] As a result, as shown in step SA2 of FIG. 10, current flows from the battery 15 to the feed motor 31, causing the feed motor 31 to rotate at a rotational speed corresponding to the battery voltage.

[0289] Therefore, when the motor current value Va becomes equal to or greater than the current limit threshold, the current flowing to the feed motor 31 is cut off, and when the battery voltage is equal to or greater than a predetermined threshold, the current flowing to the feed motor 31 is limited to temporarily reduce the number of rotations (rotational speed).

[0290] If the microcomputer 101 determines in step SA4 of FIG. 10 that the motor current value Va flowing through the feed motor 31 is less than the current limit threshold, it does not output the shut-off signal Sg2.

[0291] If the cutoff signal Sg2 is not input from the microcomputer 101, the gate driver 105 does not cut off the gate signal Sg1 output from the microcomputer 101. This allows the feed motor 31 to continue rotating at a rotational speed corresponding to the battery voltage.

[0292] When the feed motor 31 continues to rotate, the microcomputer 101 determines whether the rotation amount of the feed motor 31 has reached the rotation stop position as shown in step SA11 of FIG.

[0293] When the microcomputer 101 determines that the rotation amount of the feed motor 31 has reached the rotation stop position, it stops outputting the gate signal Sg1 as shown in step SA12 of Fig. 10. When the output of the gate signal is stopped, the current flowing from the battery 15 to the feed motor 31 is cut off as shown in step SA13 of Fig. 10, and the rotation of the feed motor 31 stops.

[0294] The control unit 14 outputs a gate signal Sg1 at a predetermined timing when the microcomputer 101 drives the motor 80 for the operation of locking the wire W at the binding unit 7, the operation of cutting the wire W at the cutting unit 6, the operation of twisting the wire W at the binding unit 7, and the operation of releasing the locking of the wire W at the binding unit 7. When the gate signal Sg1 is input from the microcomputer 101, the motor driver 102 that drives the motor 80 passes a current from the battery 15 to the motor 80. This causes the motor 80 to rotate at a number of rotations (rotational speed) corresponding to the battery voltage.

[0295] When motor 80 rotates, current detection circuit 103 detects motor current value Va flowing through motor 80, as shown in step SA3 of Fig. 10. Microcomputer 101 compares motor current value Va flowing through motor 80 with a threshold value (current limit threshold) that serves as a reference for determining whether or not control of this current is necessary, as shown in step SA4 of Fig. 10, and if it determines that motor current value Va flowing through motor 80 is equal to or greater than the current limit threshold, it outputs a shut-off signal Sg2, as shown in step SA5 of Fig. 10.

[0296] When the shut-off signal Sg2 is input from the microcomputer 101, the gate driver 105 shuts off the gate signal Sg1 output from the microcomputer 101 and does not input it to the motor driver 102, as shown in step SA6 of Fig. 10. When the gate signal Sg1 is not input to the motor driver 102, the current flowing from the battery 15 to the motor 80 is shut off, as shown in step SA7 of Fig. 10, and the motor 80 rotates by inertia. In this case, the number of rotations (rotational speed) of the motor 80 is reduced compared to when the motor 80 is driven by battery voltage.

[0297] As shown in step SA8 of Fig. 10, when the microcomputer 101 determines that a certain time has elapsed since the motor current value Va became equal to or greater than the current limit threshold, it outputs a limit release signal Sg3 instead of the blocking signal Sg2 as shown in step SA9 of Fig. 10. When the limit release signal Sg3 is input from the microcomputer 101, the gate driver 105 releases the blocking of the gate signal Sg1 output from the microcomputer 101 and inputs the gate signal Sg1 to the motor driver 102 as shown in step SA10 of Fig. 10.

[0298] As a result, as shown in step SA2 of FIG. 10, current flows from the battery 15 to the motor 80, causing the motor 80 to rotate at a number of rotations (rotational speed) according to the battery voltage.

[0299] Therefore, when the motor current value Va becomes equal to or greater than the current limit threshold, the current flowing to the motor 80 is cut off, and when the battery voltage is equal to or greater than a predetermined threshold, control is performed to limit the current flowing to the motor 80 and temporarily reduce the rotation speed (rotational speed).

[0300] If the microcomputer 101 determines in step SA4 of FIG. 10 that the motor current value Va flowing through the motor 80 is less than the current limit threshold, it does not output the shut-off signal Sg2.

[0301] If the cutoff signal Sg2 is not input from the microcomputer 101, the gate driver 105 does not cut off the gate signal Sg1 output from the microcomputer 101. This allows the motor 80 to continue rotating at a rotational speed corresponding to the battery voltage.

[0302] When the motor 80 continues to rotate, the microcomputer 101 determines whether the rotation amount of the motor 80 has reached the rotation stop position as shown in step SA11 of FIG.

[0303] When the microcomputer 101 determines that the rotation amount of the motor 80 has reached the rotation stop position, it stops outputting the gate signal Sg1 as shown in step SA12 of Fig. 10. When the output of the gate signal is stopped, the current flowing from the battery 15 to the motor 80 is interrupted as shown in step SA13 of Fig. 10, and the rotation of the motor 80 stops.

[0304] 11 is a graph showing the waveform of the current flowing through the motor during the rebar binding operation. When current is applied to the feed motor 31 to rotate it during operation E1 of feeding the wire W in the forward direction and operation E3 of winding the wire W around the rebar S, the current flowing through the feed motor 31 increases immediately after the start of current application. The current flowing through the feed motor 31 also increases during the braking operation of passing a reverse current through the feed motor 31 to stop its rotation.

[0305] Furthermore, when current is applied to the motor 80 in operation E2 of locking the wire W at the binding portion 7, operation E4 of cutting the wire W at the cutting portion 6, operation E5 of twisting the wire W at the binding portion 7, and operation E6 of releasing the locking of the wire W at the binding portion 7, the current flowing through the motor 80 increases immediately after the start of current application. Also, the current flowing through the motor 80 increases in a braking operation in which a reverse current is passed through the motor 80 to stop its rotation.

[0306] Therefore, immediately after charging when the battery voltage of the battery 15 is relatively high, the motor current value Va is likely to exceed the current limit threshold Vr. In particular, when the feed motor 31 and the motor 80 are started, the motor current value Va increases.

[0307] Therefore, by comparing the motor current value Va with the current limit threshold, the current flowing to the motor 80 and the feed motor 31 is limited in accordance with the battery voltage of the battery 15 in sections where a large amount of current flows to the motor 80 and the feed motor 31, where the load and heat generation are large, compared to sections where a small amount of current flows to the motor 80 and the feed motor 31 while current flows from the battery 15 to the motor 80 and the feed motor 31.

[0308] As a result, when the motor current value Va becomes equal to or greater than the current limit threshold, the current flowing to the motor 80 or the feed motor 31 is temporarily cut off, thereby reducing the load on the motor 80 and the feed motor 31 and suppressing heat generation.

[0309] Next, a modified example of control for limiting the current flowing through the motor during the bundling operation will be described. For example, the duty ratio of PWM control during braking operation may be changed according to the battery voltage (motor current value). For example, when switching from operation E2 of locking the wire W at the bundling part 7 shown in FIG. 11 to operation E3 of winding the wire W around the reinforcing bar S, the rotation (forward rotation) of the motor 80 is stopped, and at that time, a braking operation is performed in which a reverse current is passed through the motor 80 to brake the motor 80.

[0310] When the battery voltage is high, the number of rotations (rotational speed) of the motor 80 increases compared to when the battery voltage is low. Therefore, the duty ratio is set lower than when the battery voltage is low to perform the braking operation.

[0311] On the other hand, when the battery voltage is low, the number of rotations (rotational speed) of the motor 80 is lower than when the battery voltage is high. Therefore, the duty ratio is set higher to perform braking operation than when the battery voltage is high. This suppresses heat generation during braking operation when the battery voltage is high.

[0312] The duty ratio of the PWM control may be changed depending on the battery voltage. When the battery voltage is high, the duty ratio is lowered compared to when the battery voltage is low, thereby suppressing heat generation during braking operation when the battery voltage is high.

[0313] The lead angle may also be changed by controlling the phase difference between the current and voltage according to the battery voltage. When the battery voltage is high, the lead angle is made smaller compared to when the battery voltage is low, increasing the torque while decreasing the rotation speed. Conversely, when the battery voltage is low, the lead angle is made larger compared to when the battery voltage is high, increasing the rotation speed. This smooths the time required for the series of operations to bind the rebar S with the wire W, regardless of whether the battery voltage increases or decreases. Furthermore, when the battery voltage is high, increasing the torque while decreasing the rotation speed suppresses heat generation.

[0314] Furthermore, taking into consideration the load on the motor, the current limit may be varied depending on the number of bundling operations since the power was turned on. That is, since a new reel 20 wound with wire W has little slack in the wire W, it is necessary to rotate the reel 20 by feeding the wire W in the forward direction to unwind the wire W. Therefore, during the several bundling operations after replacing the reel 20, the load on the feed motor 31 increases, the current flowing through the feed motor 31 increases, and the feed motor 31 generates heat.

[0315] In contrast, when the bundling operation is repeated, the wire W wound on the reel 20 loosens when the wire W is fed in the reverse direction to wrap the wire W around the reinforcing bar S, and slack is created in the wire W within the magazine 2. As a result, the amount of rotation of the reel 20 required to feed the wire W in the forward direction is reduced, the load on the feed motor 31 is reduced, the current flowing through the feed motor 31 is reduced, and heat generation by the feed motor 31 is suppressed.

[0316] When replacing the reel 20, the rebar binding machine 1A must be initialized by turning the power OFF and then ON again. Therefore, the control unit 14 counts the number of consecutive binding operations, and after the power is turned ON, lowers the current limit threshold so that the current value at which the limit is applied is high until a predetermined number of binding operations are performed. Then, for subsequent binding operations, the control unit 14 raises the current limit threshold so that the current value at which the limit is applied is lower. This prevents an increase in heat generation from the feed motor 31, which would otherwise occur if the number of rotations (rotational speed) of the feed motor 31 were to increase immediately after replacing the reel when the battery voltage is high.

[0317] In addition, in one example of a bundling operation, the control of the current limit for a subsequent operation may be switched depending on the current limit for the preceding operation. For example, when the feed motor 31 is driven to feed the wire W in the forward direction or the reverse direction, the motor current value exceeds the current limit threshold, and current limiting is performed. If the motor current value exceeds the current limit threshold when the motor 80 is driven to twist the wire W, current limiting is not performed, or the current limiting threshold is increased to reduce the frequency of current limiting. This smooths the time required for the series of operations to bind the rebars S with the wire W, regardless of fluctuations in battery voltage.

[0318] Furthermore, the motor environmental temperature, such as the temperatures of the motor 80 and feed motor 31, and the temperatures around the motor 80 and feed motor 31, may be detected, and current limit control may be switched depending on the motor environmental temperature. For example, when the motor environmental temperature is high, current limiting may be performed when the motor current value exceeds the current limit threshold, or the current limiting threshold may be lowered to increase the frequency of current limiting, compared to when the motor environmental temperature is low. This prevents the motor from generating more heat when the motor's rotational speed increases when the battery voltage is high and the motor's environmental temperature is high.

[0319] Modifications of the transmission part Figures 12A to 12C are side views showing a modified example of the transmission unit of this embodiment, and Figures 13A to 13C 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.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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.

[0327] 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. 13B.

[0328] 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.

[0329] 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.

[0330] 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. 12C. 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.

[0331] 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.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] 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.

[0337] 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] 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.

[0342] 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]

[0343] 1A Rebar tying machine, 10 Main body, 2 Magazine, 2a Side wall, 2b Peripheral wall, 2c Guide wall, 2d Intrusion prevention recess, 20 Reel, 20a Storage position, 20b Feeding path, 20c Feeding outlet, 21 Cover, 21a Hinge, 21b Supporting protrusion, 21c Buckling prevention part, 21d Intrusion prevention protrusion, 22 Separating part, 22a Pressing member, 22b Supporting recess, 22c Guide protrusion, 23 Rotating member, 24 Relief part, 24a Starting point position, 3 Wire feeding a cutting portion, 30 a feed gear, 31 a feed motor, 5 a curl forming portion, 50 a curl guide, 51 a guide guide, 52 a guide groove, 53 a a first guide member, 53 b a second guide member, 54 a retraction mechanism, 54 a a shaft, 54 b a opening / closing restricting portion, 55 a frame, 55 a a opening / closing restricting member, 56 a biasing member, 57 a guide portion, 58 a wire guide portion, 59 a feed restricting portion, 6 a cutting portion, 60 a fixed blade portion (blade portion), 60 a a opening, 60 b a first abutting portion (first abutting portion) ), 60c... second abutment portion (other abutment portion), 60d... stepped 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... opening / closing guide hole, 73a... opening / 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...Drive portion, 80...Motor, 81...Reduction gear, 82a...First sun gear, 82b...Second sun gear, 83a...First planetary gear, 83b...Second planetary gear, 84a...First planetary gauge, 84b...Second planetary gauge, 85...Internal gear, 86...Bearing, 87...Support member, 88...Gear holder, 9...Transmission portion,90 Cam (displacement member), 90a, 90b Shaft, 91 Link (transmission member), 92 Cam groove, 92a First range, 92b Second range, 92c Third range, 93 Engaged portion, 95 Cutter lever (displacement member), 95a First cutter lever, 95b Second cutter lever, 14 Control unit, 15 Battery, 100 Limit circuit, 101 Microcomputer, 102 Motor driver, 103 Current detection circuit, 103a Shunt resistor, 103b Operational amplifier, 104 Comparator unit, 104a Threshold generation unit, 105 Gate driver, 106 Parallel resistor for varying limit value, W Wire,

Claims

1. a wire feeding unit that feeds the wire; 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; at least one motor that drives one or more of the wire feeding unit, the cutting unit, and the bundling unit; a battery whose battery voltage decreases when a current flows through the motor; a control unit capable of generating a threshold value that serves as a reference for determining whether or not it is necessary to limit the current flowing through the motor, and limiting the current based on the magnitude between the threshold value and a value of the current flowing through the motor in accordance with the battery voltage in a section where a large current flows through the motor compared to a section where a small current flows through the motor in a section where a current flows from the battery to the motor, and capable of counting the number of bundling operations; The control unit sets the threshold value based on the number of bundling operations. Binding machine.

2. The control unit limits the current flowing through the motor by controlling the start of rotation of the motor. The binding machine according to claim 1 .

3. The control unit limits the current flowing through the motor by controlling the motor to stop rotation. The binding machine according to claim 1 or 2.

4. The control unit limits the current flowing through the motor in accordance with the ambient temperature of the motor. The binding machine according to any one of claims 1 to 3.

5. The binding portion includes a locking member that locks the wire, a sleeve that operates the locking member, and a rotating shaft that operates the sleeve, the rotating shaft includes a feed screw that converts the rotation of the rotating shaft into movement of the sleeve along the axial direction of the rotating shaft, and the lead angle of the feed screw is 8° or more and 15° or less. The binding machine according to any one of claims 1 to 4.

Images