End Machine

Abstract

To provide a binding part capable of suppressing the looseness of a twisted wire.SOLUTION: The winding machine includes a binding part 7D having a rotation restriction portion 74 for restricting the rotation of a wire lock body 70 and a sleeve 71, the rotation restriction portion 74 including a rotation restriction blade 74a provided on the sleeve 71, and a first check member 106 and a second check member 107 provided on a body part, the first check member 106 and the second check member 107 being provided on both sides across the sleeve 71, at a position where a lock position to the rotation restriction blade 74a by the first check member 106 and a lock position to the rotation restriction blade 74a by the second check member 107 are shifted from each other by a predetermined angle with a phase difference along the rotation direction of the wire lock body 70 and the sleeve 71.SELECTED DRAWING: Figure 9A

Description

[Technical Field]

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

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

[0003] Conventionally, a bundling machine known as a rebar bundling machine has been proposed that wraps wire around two or more rebars and twists the wire wrapped around the rebars to bind the two or more rebars with the wire. The bundling machine winds the wire, which is fed by the driving force of a motor, around the rebars by passing it through a guide called a curl guide or the like that curls the wire. This curled wire is guided by a guide called an induction guide or the like to a bundling section that twists the wire, and the wire wrapped around the rebars is twisted at the bundling section, thereby bundling the rebars with the wire.

[0004] When bundling reinforcing bars with wire, if the bundling is loose, the reinforcing bars will slip, so it is necessary to hold the reinforcing bars firmly together. Therefore, a means has been devised that can rotate the torsion axis up to a predetermined load torque (see, for example, Patent Document 1). Also, a means has been devised that uses the rate of change of the driving torque to prevent the wire from breaking during torsion tightening, thereby preventing loose bundling (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-330507 [Patent Document 2] Patent No. 3227693 Summary of the Invention [Problem to be solved by the invention]

[0006] In a configuration in which the sleeve, which rotates with the torsion shaft, has multiple protrusions on its outer periphery and a stopper that engages with the protrusions to restrict sleeve rotation, when the torsion shaft is rotated forward up to a predetermined load torque and the motor is stopped, the sleeve can rotate in the reverse direction depending on the spacing of the protrusions. Therefore, when the motor is stopped, the distance from the protrusions to the stopper varies depending on the position at which the sleeve rotation stops. Therefore, if the motor stops at a position between the protrusions that are parallel to each other in the rotation direction and the distance from the protrusions to the stopper is large, the wire may become significantly loose.

[0007] The present invention has been made to solve such problems, and has an object to provide a binding machine that can prevent the twisted wire from loosening. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides a wire curling machine comprising a wire feeding section that feeds a wire, a curl forming section that forms a path for winding the wire fed by the wire feeding section around a material to be bundled, a cutting section that cuts the wire wound around the material to be bundled, and a bundling section that is driven by a motor and twists the wire wound around the material to be bundled, the bundling section comprising a rotating shaft driven by the motor, a wire locking body that locks the wire and rotates together with the rotating shaft to twist the wire, and a rotation regulating section that regulates the rotation of the wire locking body, the rotation regulating section comprising a plurality of rotation regulating blades that are aligned in the rotation direction of the wire locking body, When the wire holder rotates in the direction twisting the wire, the rotation of the wire holder is not hindered, and when the wire holder rotates in the direction opposite to the direction twisting the wire, the rotation of the wire holder is restricted. Locks onto the rotation restriction blade Possible multiple Check member and of Yes , The spacing between the check members is Rotation control blade For intervals of This is a binding machine in which the wire holders are arranged with a phase difference along the rotation direction.

[0009] In the present invention, the interval between the engagement positions of the rotation restricting blades and the check member can be made narrower than the interval between the plurality of rotation restricting blades aligned in the rotation direction of the wire locking body. [Effects of the Invention]

[0010] In the present invention, the amount of reverse rotation of the wire locking body is suppressed, and loosening of the twisted portion of the wire can be suppressed. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view showing an example of the overall configuration of a reinforcing bar binding machine. FIG. [Figure 2A] FIG. 2 is a perspective view showing an example of a binding part according to the first embodiment. [Figure 2B] FIG. 2 is a cross-sectional plan view showing an example of a binding section according to the first embodiment. [Figure 3] FIG. 2 is a block diagram showing an example of a control function of the first embodiment of the reinforcing bar binding machine. [Figure 4] 10 is a graph showing the binding force between reinforcing bars. [Figure 5A] FIG. 10 is a side view showing an example of a binding section according to a second embodiment. [Figure 5B] FIG. 10 is a cross-sectional view showing an example of a binding part according to a second embodiment. [Figure 6] FIG. 10 is a block diagram showing an example of a control function of a second embodiment of the reinforcing bar binding machine. [Figure 7A] FIG. 11 is a top view showing an example of a binding section according to a third embodiment. [Figure 7B] FIG. 10 is a cross-sectional view showing an example of a binding part of a third embodiment. [Figure 8] FIG. 10 is a block diagram showing an example of a control function of a third embodiment of the reinforcing bar binding machine. [Figure 9A] FIG. 13 is a perspective view showing an example of a binding part of a fourth embodiment. [Figure 9B] FIG. 13 is a top view showing an example of a binding part according to a fourth embodiment. [Figure 10A] 13A and 13B are cross-sectional views showing an example of the operation of the binding unit of the fourth embodiment. [Figure 10B] 13A and 13B are cross-sectional views showing an example of the operation of the binding unit of the fourth embodiment. [Figure 11] FIG. 13 is a perspective view showing an example of a binding part according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

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

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

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

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

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

[0018] The wire feeding unit 3A switches the rotation direction of the feed gear 30 by switching the rotation direction of the feed motor (not shown) between forward and reverse, and thereby switches the feed direction of the wire W between forward and reverse.

[0019] The curl forming unit 5A includes a curl guide 50 that curls the wire W fed by the wire feeding unit 3A, and an guiding guide 51 that guides the wire W curled by the curl guide 50 to the bundling unit 7A. In the rebar bundling machine 1A, the path of the wire W fed by the wire feeding unit 3A is regulated by the curl forming unit 5A, so that the trajectory of the wire W forms a loop Ru as shown by the dashed line in Figure 1, and the wire W is wound around the rebar S.

[0020] The cutting unit 6A includes a fixed blade unit 60, a movable blade unit 61 that cuts the wire W in cooperation with the fixed blade unit 60, and a transmission mechanism 62 that transmits the operation of the binding unit 7A to the movable blade unit 61. The cutting unit 6A cuts the wire W by the rotation of the movable blade unit 61 around the fixed blade unit 60 as a fulcrum axis. The transmission mechanism 62 transmits the operation of the binding unit 7A to the movable blade unit 61 via a moving member 83, and rotates the movable blade unit 61 in conjunction with the operation of the binding unit 7A to cut the wire W.

[0021] The bundling unit 7A includes a wire locking body 70 that locks the wire W. A detailed embodiment of the bundling unit 7A will be described later. The driving unit 8A includes a motor 80 and a reducer 81 that reduces speed and amplifies torque.

[0022] The reinforcing bar binding machine 1A is equipped with a feed restricting unit 90, against which the tip of the wire W abuts, in the feed path of the wire W locked by the wire locking body 70. The reinforcing bar binding machine 1A also has the curl guide 50 and guiding guide 51 of the curl forming unit 5A described above provided at the front end of the main body 10A. Furthermore, the reinforcing bar binding machine 1A has an abutting unit 91, against which the reinforcing bar S abuts, provided between the curl guide 50 and guiding guide 51 at the front end of the main body 10A.

[0023] Furthermore, the rebar binding machine 1A has a handle 11A extending downward from the main body 10A. Furthermore, a battery 15A is detachably attached to the bottom of the handle 11A. The rebar binding machine 1A also has a magazine 2A provided in front of the handle 11A. The rebar binding machine 1A has the above-mentioned wire feeding unit 3A, cutting unit 6A, binding unit 7A, drive unit 8A that drives the binding unit 7A, etc. stored in the main body 10A.

[0024] The rebar binding machine 1A has a trigger 12A provided on the front side of a handle portion 11A, and a switch 13A provided inside the handle portion 11A. Also, a board 100 on which a circuit constituting a control unit is mounted is provided in the main body portion 10A.

[0025] <Configuration example of binding section according to first embodiment> Figure 2A is an oblique view showing an example of a binding part of the first embodiment, and Figure 2B is a cross-sectional plan view showing an example of a binding part of the first embodiment.Next, with reference to each figure, the configuration of the binding part of the first embodiment will be explained.

[0026] The bundling unit 7A includes a wire locking body 70 to which the wire W is locked, and a rotating shaft 72 that operates the wire locking body 70. The bundling unit 7A and the driving unit 8A are configured such that the rotating shaft 72 and a motor 80 are connected via a reducer 81, and the rotating shaft 72 is driven by the motor 80 via the reducer 81.

[0027] The wire locking body 70 comprises a center hook 70C connected to a rotating shaft 72, a first side hook 70L and a second side hook 70R that open and close relative to the center hook 70C, and a sleeve 71 that activates the first side hook 70L and the second side hook 70R and shapes the wire W into a desired shape.

[0028] In the binding portion 7A, the side where the center hook 70C, the first side hook 70L, and the second side hook 70R are provided is the front side, and the side where the rotating shaft 72 is connected to the reducer 81 is the rear side.

[0029] The center hook 70C is connected to the front end, which is one end of the rotary shaft 72, via a structure that allows the center hook 70C to rotate relative to the rotary shaft 72 and move integrally with the rotary shaft 72 in the axial direction.

[0030] The first side hook 70L has a tip end, which is one end along the axial direction of the rotation shaft 72, located on one side of the center hook 70C. The first side hook 70L has a rear end, which is the other end along the axial direction of the rotation shaft 72, rotatably supported by the center hook 70C via a shaft 71b.

[0031] The second side hook 70R has a tip end, which is one end along the axial direction of the rotating shaft 72, located on the other side of the center hook 70C. The second side hook 70R has a rear end, which is the other end along the axial direction of the rotating shaft 72, rotatably supported by the center hook 70C via a shaft 71b.

[0032] As a result, the wire locking body 70 rotates about the shaft 71b, opening and closing the tip of the first side hook 70L in the direction of approaching and separating from the center hook 70C. Also, the tip of the second side hook 70R opens and closes in the direction of approaching and separating from the center hook 70C.

[0033] The rotating shaft 72 is rotatable integrally with the reducer 81 and has a rear end connected to the reducer 81 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 biases the rotating shaft 72 rearward, that is, in a direction toward the reducer 81. As a result, the rotating shaft 72 is configured to be movable forward, that is, in a direction away from the reducer 81, while receiving a force pulling it rearward by the spring 72c.

[0034] The sleeve 71 is supported rotatably and axially slidably by a support frame 76. The support frame 76 is an annular member, and is attached to the main body 10A in a manner that prevents it from rotating in the circumferential direction and from moving in the axial direction.

[0035] The sleeve 71 has a convex portion (not shown) that protrudes from the inner circumferential surface of the space into which the rotating shaft 72 is inserted, and this convex portion fits into a groove of a feed screw 72a that is formed along the axial direction on the outer periphery of the rotating shaft 72. When the rotating shaft 72 rotates, the sleeve 71 moves back and forth, which is the direction along the axial direction of the rotating shaft 72, according to the rotation direction of the rotating shaft 72, due to the action of the convex portion (not shown) and the feed screw 72a of the rotating shaft 72. In addition, the sleeve 71 rotates integrally with the rotating shaft 72.

[0036] The sleeve 71 includes an opening / closing pin 71a that opens and closes the first side hook 70L and the second side hook 70R.

[0037] The opening / closing pin 71a is inserted into an opening / closing guide hole 73 provided in the first side hook 70L and the second side hook 70R. The opening / closing guide hole 73 extends along the movement direction of the sleeve 71 and has a shape that converts the linear movement of the opening / closing pin 71a, which moves in conjunction with the sleeve 71, into an opening / closing operation caused by the rotation of the first side hook 70L and the second side hook 70R about the shaft 71b as a fulcrum.

[0038] As the sleeve 71 of the wire locking body 70 moves in the rearward direction indicated by the arrow A2, the first side hook 70L and the second side hook 70R move in a direction away from the center hook 70C by rotating around the axis 71b, depending on the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73.

[0039] This causes the first side hook 70L and the second side hook 70R to open relative to the center hook 70C, and a feed path through which the wire W passes is formed between the first side hook 70L and the center hook 70C, and between the second side hook 70R and the center hook 70C.

[0040] When the first side hook 70L and the second side hook 70R are open relative to the center hook 70C, the wire W fed by the wire feeding unit 3A passes between the center hook 70C and the first side hook 70L. The wire W passing between the center hook 70C and the first side hook 70L is guided to the curl forming unit 5A. The wire W is curled by the curl forming unit 5A and guided to the bundling unit 7A, where it passes between the center hook 70C and the second side hook 70R.

[0041] In the wire locking body 70, as the sleeve 71 moves forward as indicated by the arrow A1, the first side hook 70L and the second side hook 70R move in a direction approaching the center hook 70C by rotating about the shaft 71b due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73. As a result, the first side hook 70L and the second side hook 70R close against the center hook 70C.

[0042] When the first side hook 70L closes relative to the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a manner that allows it to move between the first side hook 70L and the center hook 70C. Furthermore, when the second side hook 70R closes relative to the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a manner that prevents it from slipping out from between the second side hook 70R and the center hook 70C.

[0043] The sleeve 71 has a bending portion 71c1 that shapes the wire W into a predetermined shape by pushing and bending the tip side, which is one end of the wire W, in a predetermined direction, and a bending portion 71c2 that shapes the wire W into a predetermined shape by pushing and bending the terminal side, which is the other end of the wire W cut by the cutting portion 6A, in a predetermined direction.

[0044] 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 70R, and bends it toward the reinforcing bar 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 70L and cut at the cutting portion 6A, and bends it toward the reinforcing bar S.

[0045] The binding portion 7A includes a rotation restricting portion 74 that restricts the rotation of the wire locking body 70 and the sleeve 71 in conjunction with the rotational movement of the rotary shaft 72. The rotation restricting portion 74 includes a rotation restricting blade 74a provided on the sleeve 71 and a rotation restricting claw 74b provided on the main body 10A.

[0046] The rotation restriction blades 74a are configured by providing multiple protrusions that protrude radially from the outer periphery of the sleeve 71 at predetermined intervals around the circumference of the sleeve 71. In this example, eight rotation restriction blades 74a are formed at 45° intervals. The rotation restriction blades 74a are fixed to the sleeve 71 and move and rotate integrally with the sleeve 71.

[0047] The rotation restricting claw 74b includes a first claw portion 74b1 and a second claw portion 74b2 as a pair of claw portions facing each other at a distance that allows the rotation restricting blade 74a to pass through. The first claw portion 74b1 and the second claw portion 74b2 are configured to be able to retreat from the trajectory of the rotation restricting blade 74a by being pushed by the rotation restricting blade 74a in accordance with the rotation direction of the rotation restricting blade 74a.

[0048] The rotation restricting portion 74 has a first range of operation in which the wire W is locked by the wire locking body 70, and a second range of operation in which the wire W locked by the wire locking body 70 is twisted. In the range of operation in which the wire W is bent at the bending portions 71c1, 71c2 of the sleeve 71 to form the wire W, the rotation restricting blade 74a is locked with the rotation restricting claw 74b. This restricts the rotation of the sleeve 71 in conjunction with the rotation of the rotating shaft 72, and the sleeve 71 moves in the front-to-rear direction with the rotation of the rotating shaft 72. Furthermore, in the second range of operation in which the wire W locked by the wire locking body 70 is twisted, the rotation restricting blade 74a is released from the rotation restricting claw 74b, and the sleeve 71 rotates in conjunction with the rotation of the rotating shaft 72. In the wire locking body 70, the center hook 70C, the first side hook 70L, and the second side hook 70R that lock the wire W rotate in conjunction with the rotation of the sleeve.

[0049] 3 is a block diagram showing an example of the control function of the reinforcing bar binding machine according to the first embodiment. In the reinforcing bar binding machine 1A, a control unit 14A controls a motor 80 and a feed motor 31 that drives a feed gear 30 in accordance with the state of a switch 13A that is pressed by operating a trigger 12A shown in FIG.

[0050] Motor 80 is a brushless motor, and control unit 14A is capable of recognizing and controlling the amount of rotation (rotation angle) of motor 80. Therefore, control unit 14A detects the load on motor 80, and when it detects that the load has reached its maximum, it determines the amount of rotation of motor 80 until rotation of motor 80 is stopped based on the position of rotation restriction claw 74b. Then, after detecting that the load has reached its maximum, it rotates motor 80 a predetermined amount and then stops the forward rotation of motor 80.

[0051] <Example of rebar binding machine operation> Next, the operation of binding the reinforcing bars S with the wire W by the reinforcing bar binding machine 1A will be described with reference to the respective drawings.

[0052] 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 6A. In addition, in the standby state, the rebar binding machine 1A is in a state in which the first side hook 70L is open relative to the center hook 70C and the second side hook 70R is open relative to the center hook 70C, as shown in Figures 2A and 2B.

[0053] When the reinforcing bar S is placed between the curl guide 50 and the guide 51 of the curl forming section 5A and the trigger 12A is operated, the control section 14A drives the feed motor 31 in the forward rotation direction, and the wire feed section 3A feeds the wire W in the forward direction indicated by the arrow F.

[0054] In the case of a configuration in which multiple wires W, for example, two wires W, are fed, the two wires W are fed in parallel along the axial direction of the loop Ru formed by the wires W by a wire guide (not shown).

[0055] The wire W fed in the forward direction passes between the center hook 70C and the first side hook 70L and is fed to the curl guide 50 of the curl forming unit 5A. By passing through the curl guide 50, the wire W is given a curl that wraps around the reinforcing bar S.

[0056] The wire W having been curled by the curl guide 50 is guided by the induction guide 51 and further fed in the forward direction by the wire feed unit 3A, whereby the wire W is guided by the induction guide 51 to between the center hook 70C and the second side hook 70R. The wire W is then fed until its tip abuts against the feed restricting unit 90. When the tip of the wire W has been fed to a position where it abuts against the feed restricting unit 90, the control unit 14A stops driving the feed motor 31.

[0057] After stopping the forward feed of the wire W, the control unit 14A drives the motor 80 in the forward rotation direction. In the first operating range in which the wire locking body 70 locks the wire W, the rotation restricting blade 74a is locked by the rotation restricting claw 74b, thereby restricting the rotation of the sleeve 71 linked to the rotation of the 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.

[0058] When the sleeve 71 moves forward, the opening / closing pin 71a passes through the opening / closing guide hole 73. As a result, the first side hook 70L rotates around the shaft 71b as a fulcrum and moves in a direction toward the center hook 70C. When the first side hook 70L closes against the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a manner that allows it to move between the first side hook 70L and the center hook 70C.

[0059] Additionally, the second side hook 70R moves in a direction approaching the center hook 70C by rotating about the shaft 71b. When the second side hook 70R closes against the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a manner that prevents it from slipping out from between the second side hook 70R and the center hook 70C.

[0060] After the sleeve 71 is advanced to a position where the first side hook 70L and the second side hook 70R close and lock the wire W, the control unit 14A temporarily stops the rotation of the motor 80 and drives the feed motor 31 in the reverse rotation direction, causing the pair of feed gears 30 to rotate in the reverse direction.

[0061] Therefore, 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 70R and the center hook 70C in a manner that prevents it from slipping out, the wire W is wound around the reinforcing bar S by feeding the wire W in the reverse direction.

[0062] The wire W is pulled back to a position where it will be wound around the rebar S, and the control unit 14A stops the reverse rotation of the feed motor 31 and then drives the motor 80 in the forward rotation direction, thereby moving the sleeve 71 forward as indicated by the arrow A1. The forward movement of the sleeve 71 is transmitted to the cutting unit 6A by the transmission mechanism 62, causing the movable blade unit 61 to rotate, and the wire W, which is held by the first side hook 70L and the center hook 70C, is cut by the operation of the fixed blade unit 60 and the movable blade unit 61.

[0063] Almost simultaneously with cutting the wire W, the bending portions 71c1 and 71c2 move in a direction approaching the rebar S. As a result, the tip end of the wire W, which is held by the center hook 70C and the second side hook 70R, 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 70R and the center hook 70C, is held in a state where it is sandwiched by the bending portion 71c1.

[0064] Furthermore, the end of the wire W that is engaged with the center hook 70C and the first side hook 70L and cut at the cutting portion 6A 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 70L and the center hook is held in a state where it is sandwiched by the bending portion 71c2.

[0065] After the leading end and trailing 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 wire locking body 70, the locking of the rotation restricting blade 74a with the rotation restricting claw 74b is released.

[0066] As a result, the motor 80 is further driven in the forward rotation direction, and the wire locking body 70 rotates in conjunction with the rotary shaft 72, twisting the wire W.

[0067] When the sleeve 71 rotates within the operating range of the binding portion 7A, the reinforcing bar S abuts against the abutment portion 91, restricting the reinforcing bar S from moving backward, in the direction approaching the binding portion 7A. As a result, when the wire W is twisted, a force is applied that pulls the wire retaining body 70 forward along the axial direction of the rotation shaft 72.

[0068] When a force moving the rotating shaft 72 forward in the axial direction is applied to the wire locking body 70, the rotating shaft 72 is configured to be able to move forward while being pushed backward by the spring 72c. As a result, in the binding part 7A, in the operating range in which the sleeve 71 rotates, the wire locking body 70 and the rotating shaft 72 move forward, twisting the wire W.

[0069] Figure 4 is a graph showing the binding force between reinforcing bars. By twisting the wire W, the binding force increases.

[0070] The control unit 14A detects the load on the motor 80, and when it detects that the load has reached its maximum by detecting that the rate of change of the drive torque has switched from increasing to decreasing, the control unit 14A calculates the amount of rotation D of the motor 80 required to stop the rotation of the motor 80 based on the position of the sleeve 71 along the rotational direction and the position of the rotation restricting claw 74b. Note that the position of the sleeve 71 along the rotational direction is the same as the position of the wire locking body 70 along the rotational direction. The position of the rotation restricting claw 74b is a position where the rotation restricting unit 74 can restrict the rotation of the sleeve 71 (wire locking body 70) by engaging the rotation restricting claw 74b with one of the rotation restricting blades 74a. The amount of rotation D required to stop the rotation of the motor 80 is the minimum amount of rotation required to engage the rotation restricting blade 74a with the rotation restricting claw 74b when the wire locking body 70 rotates in the reverse direction.

[0071] After detecting the maximum value of the load applied to the motor 80, the control unit 14A causes the motor 80 to further rotate by a predetermined rotation amount D, and then stops the forward rotation of the motor 80.

[0072] The solid line in Fig. 4 shows the binding force when the forward rotation of motor 80 is stopped after the maximum value of the load on motor 80 is detected and motor 80 is further rotated by a predetermined rotation amount D. The dashed line in Fig. 4 also shows the binding force when the forward rotation of motor 80 is stopped at the point when the maximum value of the load on motor 80 is detected.

[0073] As a result, after detecting the maximum load on the motor 80, the motor 80 is further rotated by a predetermined rotation amount D, and then the forward rotation of the motor 80 is stopped, thereby suppressing the amount of reverse rotation of the wire locking body 70 and preventing the twisted portion of the wire W from loosening.

[0074] Furthermore, the control unit 14A causes the motor 80 to rotate in the reverse direction, and when the motor 80 is driven in the reverse direction, the rotation restriction blade 74a is engaged with the rotation restriction claw 74b, thereby restricting the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72, and the sleeve 71 moves in the rearward direction, that is, in the direction of arrow A2.

[0075] 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 hole 73. As a result, the first side hook 70L rotates about the shaft 71b as a fulcrum and moves in a direction away from the center hook 70C. Furthermore, the second side hook 70R rotates about the shaft 71b as a fulcrum and moves in a direction away from the center hook 70C. As a result, the wire W comes out of the wire locking body 70.

[0076] <Configuration example of binding section according to second embodiment> Fig. 5A is a side view showing an example of a binding part of the second embodiment, and Fig. 5B is a cross-sectional view taken along line AA in Fig. 5A showing an example of a binding part of the second embodiment. Note that in the binding part of the second embodiment, the same components as those in the binding part of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0077] The binding part 7B includes an encoder 101 attached to the sleeve 71 and a sensor 102 that detects the encoder 101. The encoder 101 is an example of a rotational direction position detection part, and is attached to the outer periphery of the sleeve 71, and has slits 101a aligned along the rotational direction of the sleeve 71.

[0078] The sensor 102 is an example of a rotational direction position detection unit, and is composed of, for example, a pair of optical sensors made up of light emitting and receiving elements, and moves axially together with the sleeve 71, and is attached at a position where it can detect the slit 101a of the encoder 101 by a non-rotating moving member 83.

[0079] 6 is a block diagram showing an example of the control function of the reinforcing bar binding machine according to the second embodiment. In the reinforcing bar binding machine 1A, the control unit 14B controls the motor 80 and the feed motor 31 that drives the feed gear 30 in accordance with the state of the switch 13A that is pressed by operating the trigger 12A shown in FIG.

[0080] The control unit 14B detects the load on the motor 80, and when it detects that the load has reached its maximum, it calculates the amount of rotation of the motor 80 until the rotation of the motor 80 is stopped based on the amount of rotation of the sleeve 71 (wire locking body 70) detected by the sensor 102. Then, after it detects that the load has reached its maximum, it rotates the motor 80 by a predetermined amount and then stops the forward rotation of the motor 80.

[0081] <Example of operation of binding unit according to second embodiment> Next, with reference to the respective drawings, the operation of binding reinforcing bars S with wire W using binding unit 7B and drive unit 8A of the second embodiment will be described. Note that the operations of feeding wire W in the forward direction and winding it around reinforcing bars S with curl forming unit 5A, locking wire W with wire locking body 70, feeding wire W in the reverse direction and winding it around reinforcing bars S, cutting wire W, and twisting wire W are the same as those of the reinforcing bar binding machine 1A described above.

[0082] Twisting the wire W increases the load on the motor 80. The control unit 14B detects the load on the motor 80, and when it detects that the load has reached its maximum as the rate of change of the drive torque switches from increasing to decreasing, it calculates the amount of rotation D of the motor 80 required to stop the rotation of the motor 80 based on the amount of rotation of the sleeve 71 (wire locking body 70) detected by the sensor 102. The amount of rotation D required to stop the rotation of the motor 80 is the minimum amount of rotation required to lock the rotation restricting blade 74a into the rotation restricting claw 74b when the wire locking body 70 rotates in the reverse direction.

[0083] After detecting the maximum value of the load applied to the motor 80, the control unit 14B further rotates the motor 80 by a predetermined rotation amount D, and then stops the forward rotation of the motor 80.

[0084] This reduces the amount of reverse rotation of the wire locking body 70 and prevents the twisted portion of the wire W from loosening. The encoder 101 may be configured with alternating portions having different light reflectivities instead of the slits 101a, and the sensor 102 may be configured with a reflective optical sensor. The encoder 101 may also be configured with a magnet instead of the slits 101a, and the sensor 102 may be configured with a magnetic sensor.

[0085] <Configuration example of binding section according to the third embodiment> Fig. 7A is a top view showing an example of a binding part of the third embodiment, and Fig. 7B is a cross-sectional view taken along line BB of Fig. 7A showing an example of a binding part of the third embodiment. Note that in the binding part of the third embodiment, the same components as those in the binding part of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0086] The binding part 7C includes a checked member 103 attached to the sleeve 71, a check member 104 engaged with the checked member 103, and a solenoid 105 that drives the check member 104. The checked member 103 is attached to the outer periphery of the sleeve 71 and is provided with spur gear-shaped concave-convex portions 103a that are aligned in the rotational direction of the sleeve 71. The check member 104 is provided with gear-shaped concave-convex portions 104a that fit into the concave-convex portions 103a at a position facing the concave-convex portions 103a of the checked member 103. The solenoid 105 is an example of a check member drive unit, and moves the check member 104 in a direction toward or away from the checked member 103 by means of a coil, metal core, spring, etc. (not shown).

[0087] 8 is a block diagram showing an example of a control function of the reinforcing bar binding machine according to the third embodiment. In the reinforcing bar binding machine 1A, the control unit 14C controls the motor 80 and the feed motor 31 that drives the feed gear 30 in accordance with the state of the switch 13A that is pressed by operating the trigger 12A shown in FIG.

[0088] The control unit 14C detects the load on the motor 80, and when it detects that the load has reached its maximum, it stops the forward rotation of the motor 80 and drives the solenoid 105 to engage the uneven portion 104a of the check member 104 with the uneven portion 103a of the check member 103.

[0089] <Example of operation of binding unit of third embodiment> Next, with reference to the respective drawings, the operation of binding reinforcing bars S with wire W using the binding unit 7C and drive unit 8A of the third embodiment will be described. Note that the operations of feeding the wire W in the forward direction and winding it around the reinforcing bars S with the curl forming unit 5A, locking the wire W with the wire locking body 70, feeding the wire W in the reverse direction and winding it around the reinforcing bars S, cutting the wire W, and twisting the wire W are the same as those of the reinforcing bar binding machine 1A described above.

[0090] Twisting the wire W increases the load on the motor 80. The control unit 14C detects the load on the motor 80, and when it detects that the load has reached its maximum as a result of the rate of change of the drive torque switching from increasing to decreasing, it stops the forward rotation of the motor 80 and drives the solenoid 105 to engage the uneven portion 104a of the check member 104 with the uneven portion 103a of the checked member 103.

[0091] As the uneven portion 103a of the checked member 103 has a spur gear-like configuration, the spacing between the uneven portions can be made smaller than the spacing between conventional rotation-restricting blades, and the uneven portion 104a of the checked member 104 is also shaped to fit into the uneven portion 103a of the checked member 103 by being driven by the solenoid 105, and the check member 104 can be locked and unlocked by reciprocating movement.

[0092] This restricts the rotation of the sleeve 71 (wire locking body 70) when the rotation of the motor 80 stops, suppressing the amount of reverse rotation of the wire locking body 70 and preventing the twisted portion of the wire W from loosening.

[0093] <Configuration example of binding section according to the fourth embodiment> Fig. 9A is a perspective view showing an example of a binding part of the fourth embodiment, and Fig. 9B is a top view showing an example of a binding part of the fourth embodiment. Note that in the binding part of the fourth embodiment, the same components as those in the binding part of the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

[0094] The binding part 7D includes a rotation restricting part 74 that restricts the rotation of the wire locking body 70 and the sleeve 71 in conjunction with the rotation of the rotary shaft 72. The rotation restricting part 74 includes a rotation restricting blade 74a provided on the sleeve 71. In addition, a first check member 106 and a second check member 107 are provided on the main body 10A shown in FIG.

[0095] The rotation restriction blades 74a are configured by providing multiple protrusions that protrude radially from the outer periphery of the sleeve 71 at predetermined intervals around the circumference of the sleeve 71. In this example, eight rotation restriction blades 74a are formed at 45° intervals. The rotation restriction blades 74a are fixed to the sleeve 71 and move and rotate integrally with the sleeve 71.

[0096] The first check member 106 is engaged with and disengaged from the rotation restriction blade 74a by rotation about the shaft 106a as a fulcrum, and is urged by the spring 106b in a direction in which it engages with the rotation restriction blade 74a. The first check member 106 is configured to be able to retract from the trajectory of the rotation restriction blade 74a by rotation about the shaft 106a as a fulcrum when pressed by the rotation restriction blade 74a rotating in one direction (the direction of arrow F10) that is the direction in which the wire W is twisted, and to be able to engage with the rotation restriction blade 74a rotating in the other direction (the direction of arrow R10) opposite to the one direction.

[0097] The second check member 107 is engaged with and disengaged from the rotation restricting blade 74a by rotation about the shaft 107a as a fulcrum, and is urged by the spring 107b in a direction in which it engages with the rotation restricting blade 74a. The second check member 107 is configured to be able to retract from the trajectory of the rotation restricting blade 74a by rotation about the shaft 107a as a fulcrum when pressed by the rotation restricting blade 74a rotating in one direction (the direction of arrow F10) that is the direction in which the wire W is twisted, and to be able to engage with the rotation restricting blade 74a rotating in the other direction (the direction of arrow R10) opposite to the one direction.

[0098] The first check member 106 and the second check member 107 are provided on either side of the sleeve 71, and the position where the first check member 106 engages with the rotation restricting blade 74a and the position where the second check member 107 engages with the rotation restricting blade 74a are offset by a predetermined angle with a phase difference along the rotation direction of the sleeve 71 (wire locking body 70). In this example, the position where the first check member 106 engages with the rotation restricting blade 74a and the position where the second check member 107 engages with the rotation restricting blade 74a are offset by approximately 22.5°, which is half of the 45° spacing between the rotation restricting blades 74a.

[0099] As a result, when the sleeve 71 (wire locking body 70) rotates in the direction that twists the wire W, the first check member 106 and the second check member 107 retreat from the path of the rotation restricting blade 74a and do not hinder the rotation of the sleeve 71. In contrast, when the sleeve 71 (wire locking body 70) attempts to rotate in the direction opposite to the direction that twists the wire W, the first check member 106 and the second check member 107 protrude onto the path of the rotation restricting blade 74a, and either the first check member 106 or the second check member 107 engages with the rotation restricting blade 74a, restricting the rotation of the sleeve 71 in the opposite direction.

[0100] <Example of operation of binding unit of fourth embodiment> 10A and 10B are cross-sectional views taken along CC in FIG. 9B showing an example of the operation of the binding unit of the fourth embodiment, and next, with reference to these figures, the operation of binding reinforcing bars S with wire W by binding unit 7D of the fourth embodiment will be described. Note that the operation of feeding wire W in the forward direction and winding it around reinforcing bars S with curl forming unit 5A, the operation of locking wire W with wire locking body 70, the operation of feeding wire W in the reverse direction and winding it around reinforcing bars S, the operation of cutting wire W, and the operation of twisting wire W are the same as the operations of reinforcing bar binding machine 1A described above.

[0101] Twisting the wire W increases the load on the motor 80 shown in FIG. 1 and other figures. When it is detected that the load on the motor 80 has reached its maximum, the forward rotation of the motor 80 is stopped. When the forward rotation of the motor 80 stops and the motor 80 rotates in the reverse direction, a force that causes the wire locking body 70 to rotate in the reverse direction is applied to the wire locking body 70, and the wire locking body 70 rotates in the reverse direction until the rotation restriction blade 74a is locked by the first check member 106 or the second check member 107.

[0102] The amount of reverse rotation of the wire locking body 70 is the shorter of the distance between the rotation limiting blade 74a and the engagement position between the rotation limiting blade 74a and the first check member 106 when the forward rotation of the motor 80 stops, or the distance between the rotation limiting blade 74a and the engagement position between the rotation limiting blade 74a and the second check member 107, and is less than half the spacing between the rotation limiting blades 74a, in this example, less than 22.5°.

[0103] This reduces the amount of reverse rotation of the wire locking body 70, and prevents the twisted portion of the wire W from loosening.

[0104] <Configuration example of binding section according to fifth embodiment> 11 is a perspective view showing an example of the binding part of the fifth embodiment. In the binding part of the fourth embodiment, the same components as those of the binding part of the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

[0105] The binding part 7E includes a rotation restricting part 74 that restricts the rotation of the wire locking body 70 and the sleeve 71 in conjunction with the rotation of the rotary shaft 72. The rotation restricting part 74 includes a first rotation restricting blade 74c and a second rotation restricting blade 74d provided on the sleeve 71. In addition, a first check member 108 and a second check member 109 are provided on the main body 10A shown in FIG.

[0106] The first rotation restriction blade 74c 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. In this example, eight first rotation restriction blades 74c are formed at 45° intervals. The first rotation restriction blades 74c are fixed to the sleeve 71 and move and rotate integrally with the sleeve 71.

[0107] The second rotation restriction blade 74d 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. In this example, eight second rotation restriction blades 74d are formed at 45° intervals. The second rotation restriction blades 74d are fixed to the sleeve 71 and move and rotate integrally with the sleeve 71.

[0108] The first rotation restriction blade 74c and the second rotation restriction blade 74d are arranged with a phase difference along the rotation direction of the sleeve 71 (wire locking body 70), and are arranged at positions offset by approximately 22.5°, which is half of the 45° spacing between each rotation restriction blade.

[0109] The first check member 108 is engaged with and disengaged from the first rotation restricting blade 74c by rotation about the shaft 108a as a fulcrum, and is urged by the spring 108b in a direction in which it engages with the first rotation restricting blade 74c. The first check member 108 is configured to be able to retract from the path of the first rotation restricting blade 74c by rotation about the shaft 108a as a fulcrum when pressed by the first rotation restricting blade 74c rotating in the direction in which the wire W is twisted, and to be able to engage with the first rotation restricting blade 74c rotating in the direction opposite to the direction in which the wire W is twisted.

[0110] The second check member 109 is engaged with and disengaged from the second rotation restricting blade 74d by a rotational movement about the shaft 109a as a fulcrum, and is urged by the spring 109b in a direction in which it engages with the second rotation restricting blade 74d. The second check member 109 is configured to be able to retract from the trajectory of the second rotation restricting blade 74d by a rotational movement about the shaft 109a as a fulcrum when pressed by the second rotation restricting blade 74d rotating in the direction in which the wire W is twisted, and to be able to engage with the second rotation restricting blade 74d rotating in the direction opposite to the direction in which the wire W is twisted.

[0111] As a result, when the sleeve 71 (wire locking body 70) rotates in the direction twisting the wire W, the first check member 108 retreats from the path of the first rotation restriction blade 74c and does not hinder the rotation of the sleeve 71. Furthermore, when the sleeve 71 (wire locking body 70) rotates in the direction twisting the wire W, the second check member 109 retreats from the path of the second rotation restriction blade 74d and does not hinder the rotation of the sleeve 71.

[0112] In contrast, when the sleeve 71 (wire locking body 70) attempts to rotate in the direction opposite to the direction in which the wire W is twisted, the first check member 108 protrudes onto the trajectory of the first rotation restriction blade 74c, and the first check member 108 engages with the first rotation restriction blade 74c, restricting the rotation of the sleeve 71 in the opposite direction.

[0113] In addition, when the sleeve 71 (wire locking body 70) attempts to rotate in the direction opposite to the direction in which the wire W is twisted, the second check member 109 protrudes onto the trajectory of the second rotation restriction blade 74d, and the second check member 109 engages with the second rotation restriction blade 74d, thereby restricting the rotation of the sleeve 71 in the opposite direction.

[0114] The engagement position of the first rotation restriction blade 74c by the first check member 108 and the engagement position of the second rotation restriction blade 74d by the second check member 109 are shifted by approximately 22.5°, which is half of the 45° interval between the rotation restriction blades, with respect to the rotation direction of the sleeve 71. As a result, the amount of reversible rotation of the sleeve 71 (wire locking body 70) is half the interval between the rotation restriction blades.

[0115] <Example of operation of binding unit according to fifth embodiment> Next, with reference to the respective drawings, the operation of binding reinforcing bars S with wire W using the binding unit 7E of the fifth embodiment will be described. Note that the operations of feeding the wire W in the forward direction and winding it around the reinforcing bars S with the curl forming unit 5A, locking the wire W with the wire locking body 70, feeding the wire W in the reverse direction and winding it around the reinforcing bars S, cutting the wire W, and twisting the wire W are the same as those of the reinforcing bar binding machine 1A described above.

[0116] Twisting the wire W increases the load on the motor 80 shown in FIG. 1 and other figures. When it is detected that the load on the motor 80 has reached its maximum, the forward rotation of the motor 80 is stopped. When the forward rotation of the motor 80 is stopped and the motor 80 is rotated in the reverse direction, a force is applied to reverse the wire locking body 70, causing the wire locking body 70 to rotate in the reverse direction to the position where the first rotation restriction blade 74c is locked by the first check member 108 or the position where the second rotation restriction blade 74d is locked by the second check member 109.

[0117] The amount of reverse rotation of the wire locking body 70 is the shorter of the distance between the first rotation limiting blade 74c and the engagement position between the first rotation limiting blade 74c and the first check member 108 when the forward rotation of the motor 80 stops, or the distance between the second rotation limiting blade 74d and the engagement position between the second rotation limiting blade 74d and the second check member 109, and is less than half the spacing between the rotation limiting blades, in this example, less than 22.5°.

[0118] This reduces the amount of reverse rotation of the wire locking body 70, and prevents the twisted portion of the wire W from loosening. [Explanation of symbols]

[0119] 1A... rebar bundling machine, 10A... main body, 2A... magazine, 20... reel, 3A... wire feeding section, 30... feed gear, 5A... curl forming section, 50... curl guide, 51... induction guide, 6A... cutting section, 60... fixed blade section, 61... movable blade section, 62... transmission mechanism, 7A, 7B... bundling section, 70... wire retaining body, 70L... first Side hook, 70R... Second side hook, 70C... Center hook, 71... Sleeve, 71a... Opening and closing pin, 71c1... Bent portion, 71c2... Bent portion, 72... Rotating shaft, 72a... Feed screw, 72b... Connecting portion, 72c... Spring, 73... Opening and closing guide hole, 74... Rotation restricting portion, 74a... Rotation restricting blade, 74b... Rotation restricting claw, 74 c First rotation restricting blade, 74d Second rotation restricting blade, 76 Support frame, 8A Drive unit, 80 Motor, 81 Reducer, 91 Abutment unit, 101 Encoder (rotation direction position detection unit), 101a Slit, 102 Sensor (rotation direction position detection unit), 103 Non-return member, 103a Concave and concave portion, 104 Non-return member, 10 4a··· Concave and recessed portion, 105··· Solenoid (check member driving portion), 106··· First check member, 106a··· Shaft, 106b··· Spring, 107··· Second check member, 107a··· Shaft, 107b··· Spring, 108··· First check member, 108a··· Shaft, 108b··· Spring, 109··· Second check member, 109a··· Shaft, 109b··· Spring, W··· Wire

Claims

1. a wire feeding unit that feeds the wire; a curl forming section that forms a path for winding the wire fed by the wire feeding section around the bundle; a cutting unit that cuts the wire wound around the bundle; a bundling unit that is driven by a motor and twists the wire wound around the object to be bound, The binding portion is a rotating shaft driven by the motor; a wire locking body that locks the wire and rotates together with the rotary shaft to twist the wire; a rotation restricting portion that restricts rotation of the wire locking body, The rotation restricting portion is a plurality of rotation restriction blades arranged in a rotation direction of the wire locking body; a plurality of non-return members that can be engaged with the rotation restricting blades so as not to hinder the rotation of the wire locking body when the wire locking body rotates in the direction of twisting the wire, and so as to restrict the rotation of the wire locking body when the wire locking body rotates in the direction opposite to the direction of twisting the wire, The intervals between the check members are set with a phase difference in the rotation direction of the wire locking body with respect to the intervals between the rotation restricting blades. Binding machine.

2. The plurality of check members are provided with a phase difference along the rotation direction of the wire locking body. The binding machine according to claim 1 .

3. A plurality of the check members are provided along the rotation axis direction of the wire locking body. The binding machine according to claim 1 .

4. When the wire locking body rotates in the direction twisting the wire, each of the plurality of non-return members is retracted from the trajectory of the rotation restriction blade, and when the wire locking body rotates in the direction opposite to the direction twisting the wire, each of the plurality of non-return members protrudes onto the trajectory of the rotation restriction blade, and one of the plurality of non-return members is locked to one of the plurality of rotation restriction blades. The binding machine according to claim 1 .

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