Binding machine

Abstract

To provide a binding machine capable of securely feeding a wire regardless of an entry angle of the wire.SOLUTION: A reinforcement binding machine 1A comprises: a curl guide 50 giving winding curl to a wire; and an introducing guide 51 introducing the wire to which winding curl is given by the curl guide 50. The introducing guide 51 includes: a pair of side face portions 52a, 52b regulating a position in an axial direction of a loop Ru formed by the wire W to which winding curl is given by the curl guide 50; a bottom portion connecting the pair of side face portions 52a, 52b and regulating a position in a radial direction of the loop; and an introducing promotion portion 57a provided at an opening end portion 55a side of the bottom portion, which the wire enters and projecting in a direction from the bottom portion toward the curl guide 50. As to the side face portion 52a, 52b, a height in a direction from the bottom portion toward the curl guide 50 is larger than a projecting height from a bottom portion of the introducing promotion portion 57a.SELECTED DRAWING: Figure 2A

Description

Technical Field

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

Background Art

[0002] Conventionally, a tying machine called a reinforcing bar tying machine has been proposed, which winds a wire around two or more reinforcing bars and twists the wire wound around the reinforcing bars to tie the two or more reinforcing bars with the wire.

[0003] The tying machine winds the wire sent by the driving force of a motor around the reinforcing bar by passing the wire through a guide that gives a curl to the wire, such as a curl guide. The wire with the curl is guided by a guide called an induction guide or the like to a tying portion that twists the wire, and the wire wound around the reinforcing bar is twisted at the tying portion, so that the reinforcing bar is tied with the wire.

[0004] The guide for guiding the wire with the curl to the tying portion has a shape in which the interval between a pair of wall surfaces gradually narrows from the tip side where the wire enters toward the rear end side (see, for example, Patent Document 1). Thereby, the wire that has entered the guide for guiding the wire with the curl to the tying portion is guided along a pair of wall surfaces whose interval gradually narrows.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When the entry angle of the wire entering the guide that guides the wire to the end portion increases, when the tip of the wire touches one of the pair of wall surfaces, the angle at which the wire touches the wall surface increases. When the contact angle of the wire with respect to the wall surface increases, the resistance due to friction when the wire slides along the wall surface increases, and the wire cannot be fed.

[0007] The present invention has been made to solve such problems, and an object thereof is to provide a bundling machine that can surely feed a wire regardless of the entry angle of the wire.

Means for Solving the Problems

[0008] In order to solve the above-described problems, the present invention includes a wire feeding unit that feeds a wire wound around an object to be bundled, a curl guide that gives a curl to the wire fed by the wire feeding unit, and a guide that guides the wire with a curl given by the curl guide. And a binding part that twists the wire guided by the guide guide, and the guide guide regulates the axial position of the loop formed by the wire with a curl given by the curl guide, and a pair of side surfaces facing each other along the axial direction of the loop And a bottom surface portion that connects the pair of side surface portions and regulates the radial position of the loop, and an induction promotion portion that is provided on the opening end side where the wire enters the bottom surface portion and protrudes in the direction from the bottom surface portion toward the curl guide. The side surface portion is a bundling machine in which the height in the direction from the bottom surface portion toward the curl guide is higher than the height protruding from the bottom surface portion of the induction promotion portion.

[0009] In the present invention, the wire guided by the guide guide is introduced between the pair of side surface portions. The wire introduced between the pair of side surface portions spreads in a direction in which the diameter of the loop gradually increases and comes into contact with the induction promotion portion.

Effect of the Invention

[0010] The wire guided by the guide guide comes into contact with the induction promotion portion, so that a force that changes the feeding path of the wire acts on the wire. Thereby, regardless of the entry angle of the wire entering the guide guide, the wire introduced between the pair of side surface portions can be guided to the binding portion.

Brief Description of the Drawings

[0011]

Figure 1A

Figure 1B

Figure 2A

Figure 2B

Figure 2C

Figure 3A

Figure 3B

Figure 3C

Figure 4A

Figure 4B

Figure 4C

Embodiments for Carrying Out the Invention

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

[0013] <Configuration Example of the Reinforcing Bar Tying Machine of the Present Embodiment> FIG. 1A is an internal configuration diagram seen from the other side showing an example of the overall configuration of the reinforcing bar tying machine of the present embodiment, and FIG. 1B is a front sectional view showing an example of the overall configuration of the reinforcing bar tying machine of the present embodiment.

[0014] The rebar tying machine 1A is in a form that can be held and used by an operator, and includes a main body 10A and a handle 11A. Further, the rebar tying machine 1A feeds the wire W in the positive direction indicated by the arrow F, winds it around the rebar S which is the object to be tied, sends the wire W wound around the rebar S in the reverse direction indicated by the arrow R, winds it around the rebar S and cuts it, then twists the wire W to tie the rebar S with the wire W.

[0015] In order to realize the above-described functions, the rebar tying machine 1A includes a magazine 2A for accommodating the wire W, a wire feeding section 3A for feeding the wire W, and a wire guide 4A for guiding the wire W sent to the wire feeding section 3A. Further, the rebar tying machine 1A includes a curl forming section 5A that forms a path for winding the wire W sent by the wire feeding section 3A around the rebar S, and a cutting section 6A for cutting the wire W wound around the rebar S. Furthermore, the rebar tying machine 1A includes a tying section 7A for twisting the wire W wound around the rebar S, and a driving section 8A for driving the tying section 7A.

[0016] The magazine 2A is an example of an accommodating section, and a reel 20 around which a long wire W is wound so as to be payed out rotatably and detachably accommodated. The wire W is a wire made of a metal wire that can be plastically deformed, a wire in which the metal wire is coated with resin, or a stranded wire. The reel 20 has one or a plurality of wires W wound around a hub portion (not shown), and one or a plurality of wires W can be drawn out from the reel 20 at the same time.

[0017] As shown in FIG. 1B, the magazine 2A has the reel 20 attached in a state offset in one direction with respect to the wire feeding path FL of the wire W defined by the wire guide 4A described later.

[0018] The wire feeding section 3A includes a pair of feeding gears 30 that sandwich and feed one or a plurality of parallel wires W, and a feeding motor 31 that drives the feeding gears 30. In the wire feeding section 3A, the rotational operation of the feeding motor 31 is transmitted through a transmission mechanism (not shown) and the feeding gears 30 rotate.

[0019] As a result, the wire feeding section 3A feeds the wire W sandwiched between the pair of feeding gears 30 along the extending direction of the wire W. In a configuration where a plurality of wires W, for example, two wires W are fed, the two wires W are fed in a parallel state.

[0020] The wire feeding section 3A switches the forward and reverse rotation directions of the feeding motor 31, thereby switching the rotation direction of the feeding gear 30, and switching the feeding direction of the wire W between the forward direction which is one direction and the reverse direction which is the opposite direction of the one direction.

[0021] The wire guide 4A is provided at predetermined positions on the upstream side and the downstream side with respect to the feeding direction in which the wire W is fed in the forward direction. In a configuration where two wires W are fed, the wire guide 4A regulates the radial directions of the two wires W, aligns the two incoming wires W in parallel, and guides them between the pair of feeding gears 30.

[0022] The wire guide 4A has a shape such that the opening on the downstream side with respect to the feeding direction of the wire W fed in the forward direction regulates the radial direction of the wire W. On the other hand, the opening on the upstream side with respect to the feeding direction of the wire W fed in the forward direction has a larger opening area than the opening on the downstream side.

[0023] The curl forming section 5A includes a curl guide 50 that imparts a curl to the wire W fed by the wire feeding section 3A, and a guide guide 51 that guides the wire W imparted with a curl by the curl guide 50 to the bundling section 7A. In the steel bar bundling machine 1A, the path of the wire W fed by the wire feeding section 3A is regulated by the curl forming section 5A, so that the locus of the wire W becomes a loop Ru as shown by the two-dot chain line in FIG. 1A, and the wire W is wound around the steel bar S.

[0024] FIG. 2A is an overall perspective view showing an example of the guiding guide of the present embodiment, FIG. 2B is a cross-sectional view of a main part showing an example of the guiding guide part of the present embodiment, and FIG. 2C is a plan view of a main part showing an example of the guiding guide part of the present embodiment. Next, the guiding guide 51 of the present embodiment will be described. The guiding guide 51 is provided at a position offset in a direction opposite to one direction in which the reel 20 is offset with respect to the feeding path FL of the wire W defined by the wire guide 4A.

[0025] The guiding guide 51 includes a first guide portion 52 that regulates the axial position of the loop Ru formed by the wire W curled by the curl guide 50, and a second guide portion 53 and a third guide portion 54 that regulate the radial position of the loop Ru formed by the wire W.

[0026] The first guide portion 52 and the second guide portion 53 are provided on the side where the wire W curled by the curl guide 50 is introduced with respect to the third guide portion 54.

[0027] The first guide portion 52 includes a side surface portion 52b on one side that is the side located in one direction in which the reel 20 is offset. The first guide portion 52 also includes a side surface portion 52a that faces the side surface portion 52b on the other side that is the side located in the direction opposite to the one direction in which the reel 20 is offset.

[0028] The second guide portion 53 includes a bottom surface portion 53a that connects the side surface portion 52a and the side surface portion 52b with the side surface portion 52b standing on one side and the side surface portion 52a standing on the other side.

[0029] The third guide portion 54 includes a guide surface 54a formed by a surface that extends along the feeding direction of the wire W toward the bundling portion 7A on the outer side in the radial direction of the loop Ru formed by the wire W.

[0030] The guiding guide 51 has a converging passage 55 formed in a space surrounded by a pair of side portions 52a, 52b and a bottom portion 53a. Further, the guiding guide 51 has an opening end portion 55a formed in the converging passage 55 through which the wire W enters. The opening end portion 55a opens in a space surrounded by the pair of side portions 52a, 52b and the bottom portion 53a.

[0031] In the first guide portion 52, the distance between the side portion 52a and the side portion 52b is the widest at the opening end portion 55a, and becomes narrower as it goes from the opening end portion 55a toward the guide surface 54a of the third guide portion 54, and a narrowest portion 55b is formed.

[0032] The guiding guide 51 includes an entry angle regulating portion 56 that changes the entry angle of the wire W entering the converging passage 55 so as to face the narrowest portion 55b.

[0033] In the steel bar bundling machine 1A, the reel 20 is arranged offset in one direction. The wire W sent from the reel 20 offset in this one direction and curled by the curl guide 50 by the wire feeding portion 3A travels in the other direction, which is the opposite direction of the one direction in which the reel 20 is offset.

[0034] Therefore, the wire W entering the converging passage 55 between the side portion 52a and the side portion 52b of the first guide portion 52 first enters toward the side portion 52a. The tip of the wire W entering toward the side portion 52a is directed toward the narrowest portion 55b of the converging passage 55. For this reason, the entry angle regulating portion 56 is provided on the side portion 52b facing the side portion 52a.

[0035] The entry angle regulating portion 56 is configured such that the vicinity of the middle in the entry direction of the wire W on the side portion 52b has a convex shape toward the side portion 52b.

[0036] The guiding guide 51 contacts the wire W from the radially outer side of the loop Ru formed by the wire W curled by the curling guide 50, and includes an induction promotion portion 57a that applies a force to change the feeding path of the wire W to the wire W. Further, the guiding guide 51 includes an induction recess 57b into which the wire W spreading toward the radially outer side of the loop Ru enters, between the induction promotion portion 57a and the third guide portion 54.

[0037] The induction promotion portion 57a is configured by providing a convex portion protruding in the direction of the curling guide 50 on the bottom surface portion 53a of the second guide portion 53 formed of a plane. The induction promotion portion 57a is provided on the side of the opening end portion 55a from the center of the bottom surface portion 53a along the feeding direction of the wire W, and in this example, is provided along the entire width along the opening end portion 55a.

[0038] The induction promotion portion 57a is configured by integrally forming a convex member having a predetermined shape such as a triangular cross-sectional shape with the bottom surface portion 53a, or attaching a component independent of the bottom surface portion 53a to the bottom surface portion 53a. Further, the induction promotion portion 57a may be configured by a rotating member such as a roller that has an axis extending along the opening end portion 55a and is rotatable when the wire W contacts it. The protruding height of the induction promotion portion 57a from the bottom surface portion 53a is a height at which the tip of the wire W curled by the curling guide 50 and guided by the guiding guide 51 does not hit.

[0039] The induction recess 57b is provided on the downstream side of the induction promotion portion 57a with respect to the feeding direction of the wire W fed in the positive direction, and is constituted by the bottom surface portion 53a of the second guide portion 53 that is concave toward the radially outer side of the loop Ru formed by the wire W with respect to the induction promotion portion 57a.

[0040] The wire with a curl formed by the curl guide 50 is introduced between a pair of side surfaces 52a and 52b of the first guide portion 52. The guiding guide 51 spreads in a direction in which the diameter of the loop Ru formed by the wire W increases, so that the wire W comes into contact with the guiding promotion portion 57a of the second guide portion 53, and the direction in which the wire W enters is changed. As a result, the wire W introduced between the pair of side surfaces 52a and 52b of the first guide portion 52 is guided to the third guide portion 54.

[0041] The cutting portion 6A includes a fixed blade portion 60, a movable blade portion 61 that cuts the wire W in cooperation with the fixed blade portion 60, and a transmission mechanism 62 that transmits the operation of the binding portion 7A to the movable blade portion 61. The cutting portion 6A cuts the wire W by the rotational operation of the movable blade portion 61 with the fixed blade portion 60 as a fulcrum shaft.

[0042] The binding portion 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 driving portion 8A includes a motor 80 and a speed reducer 81 that performs speed reduction and torque amplification. The binding portion 7A and the driving portion 8A are connected such that the rotating shaft 72 and the motor 80 are connected via the speed reducer 81, and the rotating shaft 72 is driven by the motor 80 via the speed reducer 81.

[0043] In the steel bar tying machine 1A, the curl guide 50 and the guiding guide 51 of the curl forming portion 5A described above are provided at the front end of the main body portion 10A on one side along the axial direction of the rotating shaft 72. Further, the steel bar tying machine 1A includes a feed restricting portion 90 against which the tip of the wire W is abutted in the feed path of the wire W guided by the curl forming portion 5A and locked by the wire locking body 70. Furthermore, in the steel bar tying machine 1A, an abutting portion 91 against which the steel bar S is abutted is provided between the curl guide 50 and the guiding guide 51 at the front end of the main body portion 10A.

[0044] In the steel bar bundling machine 1A, the handle portion 11A extends downward from the main body portion 10A. Further, a battery 15A is detachably attached to the lower portion of the handle portion 11A. Furthermore, in the steel bar bundling machine 1A, a magazine 2A is provided in front of the handle portion 11A. In the steel bar bundling machine 1A, the wire feeding portion 3A, the cutting portion 6A, the bundling portion 7A, the driving portion 8A for driving the bundling portion 7A, etc., described above are housed in the main body portion 10A.

[0045] In the steel bar bundling machine 1A, a trigger 12A is provided on the front side of the handle portion 11A, and a switch 13A is provided inside the handle portion 11A. In the steel bar bundling machine 1A, according to the state of the switch 13A pushed by the operation of the trigger 12A, the control portion 14A controls the motor 80 and the feeding motor 31.

[0046] FIG. 3A is a side view showing the main part configuration of the steel bar bundling machine of the present embodiment, FIG. 3B is a top view showing the main part configuration of the steel bar bundling machine of the present embodiment, and FIG. 3C is a top cross-sectional view showing the main part configuration of the steel bar bundling machine of the present embodiment. Next, with reference to each figure, the details of the bundling portion 7A and the connection structure between the bundling portion 7A and the driving portion 8A will be described.

[0047] The bundling portion 7A includes a wire locking body 70 to which a wire W is locked, and a rotating shaft 72 for operating the wire locking body 70. The bundling portion 7A and the driving portion 8A are connected such that the rotating shaft 72 and the motor 80 are connected via a speed reducer 81, and the rotating shaft 72 is driven by the motor 80 via the speed reducer 81.

[0048] The wire locking body 70 includes a center hook 70C connected to the rotating shaft 72, a first side hook 70L and a second side hook 70R that open and close with respect to the center hook 70C, and a sleeve 71 that operates the first side hook 70L and the second side hook 70R in conjunction with the rotational movement of the rotating shaft 72.

[0049] In the bundling portion 7A, the side where the center hook 70C, the first side hook 70L, and the second side hook 70R are provided is the front side, and the side where the rotating shaft 72 is connected to the speed reducer 81 is the rear side.

[0050] The center hook 70C is connected to the front end, which is one end of the rotating shaft 72, through a structure that is rotatable with respect to the rotating shaft 72 and axially movable integrally with the rotating shaft 72.

[0051] The first side hook 70L is positioned on one side with respect to the center hook 70C at the tip side, which is one end along the axial direction of the rotating shaft 72. Also, the rear end side, which is the other end along the axial direction of the rotating shaft 72, of the first side hook 70L is rotatably supported by the center hook 70C with the shaft 71b.

[0052] The second side hook 70R is positioned on the other side with respect to the center hook 70C at the tip side, which is one end along the axial direction of the rotating shaft 72. Also, the rear end side, which is the other end along the axial direction of the rotating shaft 72, of the second side hook 70R is rotatably supported by the center hook 70C with the shaft 71b.

[0053] Thereby, the wire locking body 70 opens and closes in a direction in which the tip side of the first side hook 70L separates from and contacts the center hook 70C by a rotational operation with the shaft 71b as a fulcrum. Also, the tip side of the second side hook 70R opens and closes in a direction in which it separates from and contacts the center hook 70C.

[0054] The rotating shaft 72 is connected to the reduction gear 81 at the rear end, which is the other end, through a connecting portion 72b having a structure that is rotatable integrally with the reduction gear 81 and axially movable with respect to the reduction gear 81. The connecting portion 72b includes a spring 72c that biases the rotating shaft 72 in the rearward direction, which is the direction approaching the reduction gear 81, and regulates the position of the rotating shaft 72 along the axial direction. Thereby, the rotating shaft 72 is configured to be movable forward in the direction away from the reduction gear 81 while receiving the force pushed rearward by the spring 72c. Therefore, when a force for moving the wire locking body 70 forward along the axial direction is applied, the rotating shaft 72 is movable forward while receiving the force pushed rearward by the spring 72c.

[0055] The sleeve 71 has a shape in which a range of a predetermined length along the axial direction of the rotary shaft 72 is radially divided into two parts from the front end portion indicated by the arrow A1, and the first side hook 70L and the second side hook 70R can be opened and closed. Further, the sleeve 71 is cylindrical and covers the periphery of the rotary shaft 72, and has a convex portion (not shown) protruding from the inner peripheral surface of the cylindrical space into which the rotary shaft 72 is inserted, and this convex portion fits into the groove portion of the feed screw 72a formed along the outer periphery of the rotary shaft 72 in the axial direction. When the rotary shaft 72 rotates, the sleeve 71 moves in the front-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 the convex portion (not shown) and the feed screw 72a of the rotary shaft 72. Further, the sleeve 71 rotates integrally with the rotary shaft 72.

[0056] The sleeve 71 includes an opening and closing pin 71a for opening and closing the first side hook 70L and the second side hook 70R.

[0057] The opening and closing pin 71a is inserted into the opening and closing guide holes 73 provided in the first side hook 70L and the second side hook 70R. The opening and closing guide holes 73 extend along the moving direction of the sleeve 71, and have a shape that converts the linear movement of the opening and closing pin 71a that moves in conjunction with the sleeve 71 into an opening and closing operation by the rotation of the first side hook 70L and the second side hook 70R with the shaft 71b as a fulcrum.

[0058] When the sleeve 71 moves in the rear direction indicated by the arrow A2, the first side hook 70L and the second side hook 70R move in a direction away from the center hook 70C by a rotational movement with the shaft 71b as a fulcrum due to the locus of the opening and closing pin 71a and the shape of the opening and closing guide holes 73 of the wire locking body 70.

[0059] Thereby, the first side hook 70L and the second side hook 70R open with respect to the center hook 70C, and a feed path through which the wire W passes is formed between the first side hook 70L and the center hook 70C and between the second side hook 70R and the center hook 70C.

[0060] When the first side hook 70L and the second side hook are open with respect 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. Then, the wire W that is curled by the curl forming unit 5A and guided to the bundling unit 7A passes between the center hook 70C and the second side hook 70R.

[0061] When the sleeve 71 of the wire locking body 70 moves in the forward direction indicated by the arrow A1, the first side hook 70L and the second side hook 70R move in a direction approaching the center hook 70C by a rotational movement with the shaft 71b as a fulcrum, due to the locus of the opening and closing pin 71a and the shape of the opening and closing guide hole 73. Thereby, the first side hook 70L and the second side hook 70R close with respect to the center hook 70C.

[0062] When the first side hook 70L closes with respect to the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a form that allows it to move between the first side hook 70L and the center hook 70C. Also, when the second side hook 70R closes with respect to the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a form that prevents it from coming out between the second side hook 70R and the center hook 70C.

[0063] The wire locking body 70 includes a bending portion 71c1 that forms the wire W into a predetermined shape by pushing and bending the tip side, which is one end of the wire W, in a predetermined direction. Also, the wire locking body 70 includes a bending portion 71c2 that forms 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.

[0064] The sleeve 71 has a front end portion indicated by the arrow A1 that is divided into two parts with the first side hook 70L, the second side hook 70R, and the center hook 70C in between, and a bent portion 71c1 is formed at the front end portion located on the upper side in the non-rotating region, and a bent portion 71c2 is formed at the front end portion located on the lower side.

[0065] After the wire W is cut at the cutting portion 6A, the sleeve 71 further moves forward in the direction indicated by the arrow A1, and presses the tip side of the wire W locked by the center hook 70C and the second side hook 70R with the bent portion 71c1, and bends it toward the reinforcing bar S side. Further, the sleeve 71 locks with the center hook 70C and the first side hook 70L, and presses the end side of the wire W cut at the cutting portion 6A with the bent portion 71c2, and bends it toward the reinforcing bar S side.

[0066] The bundling portion 7A includes a rotation restricting portion 74 that restricts the rotation of the wire locking body 70 and the sleeve 71 interlocked with the rotation operation of the rotation shaft 72. The rotation restricting portion 74 is provided with rotation restricting vanes 74a on the sleeve 71 and rotation restricting claws 74b on the main body portion 10A.

[0067] The rotation restricting vanes 74a are configured by providing a plurality of convex portions protruding radially from the outer periphery of the sleeve 71 at predetermined intervals in the circumferential direction of the sleeve 71. The rotation restricting vanes 74a are fixed to the sleeve 71 and move and rotate integrally with the sleeve 71.

[0068] In the operating range where the rotation restricting portion 74 locks the wire W with the wire locking body 70, winds the wire W around the reinforcing bar S, cuts it by the cutting portion 6A, and further bends and forms the wire W with the bent portions 71c1 and 71c2 of the sleeve 71, the rotation restricting vanes 74a are locked to the rotation restricting claws 74b. When the rotation restricting vanes 74a are locked to the rotation restricting claws 74b, the rotation of the sleeve 71 interlocked with the rotation of the rotation shaft 72 is restricted, and the sleeve 71 moves in the front-rear direction by the rotation operation of the rotation shaft 72.

[0069] Further, in the operating range where the rotation restricting unit 74 twists the wire W locked by the wire locking body 70, the engagement between the rotation restricting claw 74b of the rotation restricting blade 74a is released. When the engagement between the rotation restricting claw 74b of the rotation restricting blade 74a is released, the sleeve 71 rotates in conjunction with the rotation of the rotary shaft 72. The wire locking body 70 rotates the center hook 70C, the first side hook 70L, and the second side hook 70R that lock the wire W in conjunction with the rotation of the sleeve 71. In the operating range of the sleeve 71 and the wire locking body 70 along the axial direction of the rotary shaft 72, the operating range where the wire locking body 70 locks the wire W is referred to as the first operating range. Further, the operating range where the wire W locked by the wire locking body 70 in the first operating range is twisted is referred to as the second operating range.

[0070] The binding portion 7A is provided such that the moving member 83 can move in conjunction with the sleeve 71. The moving member 83 is rotatably attached to the sleeve 71, and moves in the front-rear direction in conjunction with the sleeve 71 without being linked to the rotation of the sleeve 71.

[0071] The moving member 83 includes an engaging portion 83a that engages with the transmission mechanism 62. When the moving member 83 moves in the front-rear direction in conjunction with the sleeve 71, the binding portion 7A transmits the movement of the moving member 83 to the movable blade portion 61 through the transmission mechanism 62, and rotates the movable blade portion 61. As a result, in the operation where the sleeve 71 moves forward, the movable blade portion 61 rotates in a predetermined direction, and the wire W is cut.

[0072] The binding portion 7A includes a tension applying spring 92 that enables binding to be performed with a tension applied to the wire W. The tension applying spring 92 is provided outside the sleeve 71, and biases the sleeve 71 and the wire locking body 70 in a direction away from the abutting portion 91 along the axial direction of the rotary shaft 72. The tension applying spring 92 is constituted by, for example, a coil spring that expands and contracts in the axial direction, and is fitted on the outer periphery of the sleeve 71 between the rotation restricting blade 74a and the support frame 76d that rotatably and slidably supports the sleeve 71 in the axial direction.

[0073] The tension-applying spring 92 is compressed between the support frame 76d and the rotation-restricting blade 74a according to the position of the sleeve 71 along the axial direction of the rotation shaft 72, and biases the sleeve 71 rearward in a direction away from the abutting portion 91 along the axial direction of the rotation shaft 72. Thereby, the tension-applying spring 92 biases the wire locking body 70 provided with the sleeve 71 in a direction to send the wire W in the reverse direction and maintain the tension applied to the wire W in the operation of winding the wire W around the reinforcing bar S.

[0074] Thereby, when the sleeve 71 moves forward and is compressed, the tension-applying spring 92 applies a tension to the wire W wound around the reinforcing bar S and then cut at the cutting portion 6A with a force greater than the force applied in a direction in which the wire W wound around the reinforcing bar S loosens. Thus, it becomes possible to perform bundling with the wire W in a state where tension is applied.

[0075] Further, the wire locking body 70 is configured to be movable forward while receiving the force that the sleeve 71 is pushed rearward by the tension-applying spring 92 and while receiving the force that the rotation shaft 72 is pushed rearward by the spring 72c.

[0076] <Operation example of the reinforcing bar bundling machine of the present embodiment> Next, with reference to the respective drawings, the operation of bundling the reinforcing bar S with the wire W by the reinforcing bar bundling machine 1A of the present embodiment will be described.

[0077] When the reinforcing bar S is placed between the curl guide 50 and the guide guide 51 of the curl forming portion 5A and the trigger 12A is operated, the feed motor 31 is driven in the forward rotation direction, and the wire W is fed in the forward direction indicated by the arrow F by the wire feed portion 3A.

[0078] In the case of a configuration in which the reinforcing bar S is bundled with a plurality of, for example, two wires W, the two wires W are fed in a state of being parallel along the axial direction of the loop Ru formed by the wire W by the wire guide 4A.

[0079] The wire W sent in the positive direction passes between the center hook 70C and the first side hook 70L and is sent to the curl guide 50 of the curl forming portion 5A. By passing through the curl guide 50, the wire W is given a curl around the reinforcing bar S.

[0080] The wire W with a curl formed by the curl guide 50 is guided by the guide guide 51. FIGS. 4A, 4B, and 4C are explanatory diagrams showing the movement of the wire in the guide guide. Next, the function and effect of guiding the wire W by the guide guide 51 will be described.

[0081] The wire W with a curl formed by the curl guide 50 and guided by the guide guide 51 passes through a path away from the bottom surface portion 53a of the second guide portion 53 in the guide guide 51 as shown in FIG. 4A. Also, the wire W with a curl formed by the curl guide 50 travels in the other direction, which is the opposite direction to the one in which the reel 20 is offset. For this reason, in the guide guide 51, the wire W that enters between the side surface portion 52a and the side surface portion 52b of the first guide portion 52 first enters toward the side surface portion 52a.

[0082] In the guide guide 51, when the tip WS of the wire W entering toward the side surface portion 52a contacts the side surface portion 52a, the resistance when the tip WS of the wire W is guided along the side surface portion 52a increases. When the amount of movement of the tip WS of the wire W moving along the side surface portion 52a decreases due to the resistance of friction and the feeding amount of the wire W sent in the positive direction becomes relatively large, the diameter of the loop Ru formed by the wire W with a curl formed by the curl guide 50 gradually increases.

[0083] The wire W guided by the guide guide 51 can enter the induction recess 57b up to the position where it contacts the bottom surface portion 53a of the second guide portion 53 as the diameter of the loop Ru gradually increases by being sent in the positive direction.

[0084] Therefore, the wire W guided by the guiding guide 51 with its tip WS in contact with the side surface portion 52a enters the guiding recess 57b as shown in Fig. 4B with the diameter of the loop Ru gradually increasing, and contacts the guiding promotion portion 57a on the upstream side of the guiding recess 57b with respect to the feeding direction of the wire W.

[0085] When the wire W guided by the guiding guide 51 contacts the guiding promotion portion 57a, a force acts on the wire W to change the feeding path of the wire W entering toward the side surface portion 52a. As a result, the wire W guided by the guiding guide 51 is further fed in the positive direction, so that the tip WS is guided in a direction away from the side surface portion 52a and can be introduced into the narrowest portion 55b toward the third guide portion 54b as shown in Fig. 4C.

[0086] Note that the wire W guided by the guiding guide 51 with its tip WS in contact with the side surface portion 52a also has a force acting on the wire W to change the feeding path of the wire W entering toward the side surface portion 52a by contacting the entry angle restricting portion 56 before contacting the guiding promotion portion 57a. As a result, the wire W guided by the guiding guide 51 is further fed in the positive direction, so that the tip WS is guided in a direction away from the side surface portion 52a and can be introduced into the narrowest portion 55b toward the third guide portion 54b.

[0087] The wire W with a curl formed by the curl guide 50 is guided by the guiding guide 51 and further fed in the positive direction by the wire feeding section 3A, and thus is guided between the center hook 70C and the second side hook 70R by the guiding guide 51. Then, the wire W is fed until its tip abuts against the feeding restricting section 90. When the wire W is fed to the position where its tip abuts against the feeding restricting section 90, the driving of the feeding motor 31 is stopped.

[0088] After stopping the forward feeding of the wire W, the motor 80 is driven in the forward rotation direction. In the first operating range where the wire locking body 70 locks the wire W, the rotation of the sleeve 71 linked to the rotation of the rotary shaft 72 is restricted when the rotation restricting vane 74a is locked to the rotation restricting claw 74b. As a result, the rotation of the motor 80 is converted into linear movement, and the sleeve 71 moves in the forward direction of the arrow A1.

[0089] When the sleeve 71 moves forward, the opening and closing pin 71a passes through the opening and closing guide hole 73. As a result, the first side hook 70L moves in a direction approaching the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. When the first side hook 70L closes with respect to the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a form that allows it to move between the first side hook 70L and the center hook 70C.

[0090] Also, the second side hook 70R moves in a direction approaching the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. When the second side hook 70R closes with respect to the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a form that does not allow it to escape from between the second side hook 70R and the center hook 70C.

[0091] After advancing the sleeve 71 to the position where the wire W is locked by the closing operations of the first side hook 70L and the second side hook 70R, the rotation of the motor 80 is temporarily stopped, and the feed motor 31 is driven in the reverse rotation direction.

[0092] As a result, the pair of feed gears 30 reverses, and the wire W sandwiched between the pair of feed gears 30 is fed in the reverse direction indicated by the arrow R. Since the tip side of the wire W is locked in a form that does not allow it to escape from between the second side hook 70R and the center hook 70C, the wire W is wound around the reinforcing bar S by the operation of feeding the wire W in the reverse direction.

[0093] Wrap the wire W around the reinforcing bar S. After stopping the driving of the feed motor 31 in the reverse rotation direction, drive the motor 80 in the forward rotation direction to move the sleeve 71 further in the forward direction indicated by the arrow A1.

[0094] The operation of the sleeve 71 moving forward is transmitted to the cutting portion 6A by the transmission mechanism 62, causing the movable blade portion 61 to rotate, and the wire W locked by the first side hook 70L and the center hook 70C is cut by the operations of the fixed blade portion 60 and the movable blade portion 61.

[0095] When the wire W is cut, the tension applied to the wire W is released, and the sleeve 71 tries to move forward. When the sleeve 71 moves forward, the force pulling the wire W locked by the wire locking body 70 backward decreases, and the wire W wound around the reinforcing bar S loosens before being twisted.

[0096] In contrast, in the present embodiment, the reinforcing bar bundling machine 1A moves the sleeve 71 and the wire locking body 70 forward. In the operation range where the wire W is cut, the rotation restricting blade 74a contacts the tension applying spring 92, and the tension applying spring 92 is compressed between the support frame 76d and the rotation restricting blade 74a, and the sleeve 71 and the wire locking body 70 are biased backward by the tension applying spring 92.

[0097] Thereby, the forward movement of the sleeve 71 is suppressed, so that the decrease in the force pulling the wire W locked by the wire locking body 70 backward is suppressed, and the wire W wound around the reinforcing bar S is suppressed from loosening before being twisted.

[0098] By driving the motor 80 in the forward rotation direction, the sleeve 71 is moved in the forward direction indicated by the arrow A1 to cut the wire W. Almost simultaneously, the bending portion 71c1 moves in the direction approaching the reinforcing bar S. As a result, the tip side of the wire W locked by the center hook 70C and the second side hook 70R is pressed toward the reinforcing bar S by the bending portion 71c1, and is bent toward the reinforcing bar S with the locking position as a fulcrum. As the sleeve 71 moves further forward, the wire W locked between the second side hook 70R and the center hook 70C is held in a state of being sandwiched by the bending portion 71c1.

[0099] Also, the terminal side of the wire W cut by the cutting portion 6A is held between the first wire holding portion 71c2a and the second wire holding portion 71c2b constituting the bending portion 71c2 of the sleeve 71 and the retaining portion 70La of the first side hook 70L, and is further pressed toward the reinforcing bar S by the bending portion 71c2, and is bent toward the reinforcing bar S with the locking position as a fulcrum. As the sleeve 71 moves further forward, the wire W locked between the first side hook 70L and the center hook is held in a state of being sandwiched by the bending portion 71c2.

[0100] After the tip side and the terminal side of the wire W are bent toward the reinforcing bar S, when the motor 80 is further driven in the forward rotation direction, the sleeve 71 moves further forward. When the sleeve 71 moves to a predetermined position and reaches the operating range for twisting the wire W locked by the wire locking body 70, the locking between the rotation restricting claw 74b of the rotation restricting blade 74a is released.

[0101] As a result, when the motor 80 is further driven in the forward rotation direction, the sleeve 71 rotates in conjunction with the rotary shaft 72, and the wire W locked by the wire locking body 70 is twisted.

[0102] In the second operating range where the sleeve 71 rotates to twist the wire W, the wire W locked by the wire locking body 70 is twisted, and a force is applied to pull the wire locking body 70 forward along the axial direction of the rotation axis 72. On the other hand, by moving forward to a position where the sleeve 71 can rotate, the tension applying spring 92 is further compressed, and the sleeve 71 receives a force to be pushed backward by the tension applying spring 92.

[0103] As a result, when a force to move the wire locking body 70 and the rotation axis 72 forward along the axial direction is applied to the wire locking body 70, the sleeve 71 receives a force to be pushed backward by the tension applying spring 92, and the rotation axis 72 moves forward while receiving a force to be pushed backward by the spring 72c, and twists the wire W while moving forward.

[0104] Therefore, the part of the wire W locked by the wire locking body 70 is pulled backward, a tension is applied in the tangential direction of the reinforcing bar S, and the wire W is pulled to be in close contact with the reinforcing bar S. In the second operating range where the sleeve 71 rotates to twist the wire W, when the wire locking body 70 further rotates in conjunction with the rotation axis 72, the wire locking body 70 and the rotation axis 72 move forward in the forward direction, which is the direction in which the gap between the twisted part of the wire W and the reinforcing bar S becomes smaller, and further twist the wire W.

[0105] Therefore, the wire W is twisted while moving forward in a state where the wire locking body 70 and the rotation axis 72 receive a force to be pushed backward by the tension applying spring 92 and the spring 72c, so that the gap between the twisted part of the wire W and the reinforcing bar S becomes smaller, and the wire W adheres to the reinforcing bar S in a form along the reinforcing bar S. As a result, the slack before twisting the wire W can be removed, and the wire W can be tied in a state of being in close contact with the reinforcing bar S.

[0106] When it is detected that the load applied to the motor 80 reaches the maximum by twisting the wire W, the forward rotation of the motor 80 is stopped. Next, when the motor 80 is driven in the reverse rotation direction, the rotary shaft 72 rotates in the reverse direction, and when the sleeve 71 rotates in the reverse direction following the reverse rotation of the rotary shaft 72, the rotation restricting vane 74a is locked to 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 sleeve 71 moves in the direction of arrow A2 which is the rear direction.

[0107] When the sleeve 71 moves rearward, the bent portions 71c1 and 71c2 move away from the wire W, and the holding of the wire W by the bent portions 71c1 and 71c2 is released. Further, when the sleeve 71 moves rearward, the opening and closing pin 71a passes through the opening and closing guide hole 73. As a result, the first side hook 70L moves in a direction away from the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. Also, the second side hook 70R moves in a direction away from the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. Thereby, the wire W comes out of the wire locking body 70.

Explanation of Signs

[0108] 1A... Steel bar tying machine, 10A... Main body part, 11A... Handle part, 2A... Magazine, 20... Reel, 3A... Wire feeding part, 30... Feeding gear, 31... Feeding motor, 4A... Wire guide, 5A... Crimp forming part, 50... Crimp guide, 51... Inductive guide, 52... First guide part, 52a, 52b... Side faces, 53... Second guide part, 53a... Bottom face, 54... Third guide part, 54a... Guide surface, 55a... Opening end part, 55b... Narrowest part, 56... Entrance angle restricting part, 57a... Inductive promoting part, 57b... Inductive recess, 6A... Cutting part, 7A... Tying part, 70... Wire locking body, 72... Rotary shaft, 8A... Driving part, 80... Motor, W... Wire

Claims

1. A wire feeding unit for feeding a wire wound around an end object, a curl guide for imparting a curl to the wire fed by the wire feeding unit, a guiding guide for guiding the wire with a curl imparted by the curl guide, and a binding portion for twisting the wire guided by the guiding guide and comprising: The guiding guide regulates the axial position of a loop formed by the wire with a curl imparted by the curl guide, and has a pair of side surfaces facing each other along the axial direction of the loop, a bottom surface connecting the pair of side surfaces and regulating the radial position of the loop, and a guiding promotion portion provided on the opening end side of the bottom surface where the wire enters, and protruding in a direction from the bottom surface toward the curl guide and having: The side surface has a height in the direction from the bottom surface toward the curl guide that is higher than the height protruding from the bottom surface of the guiding promotion portion Binding machine.

2. The guiding guide regulates the radial position of the loop and has a guide surface provided on the downstream side of the bottom surface with respect to the wire feeding direction, The side surface has a height in the direction from the bottom surface toward the curl guide that is continuously higher than the guiding promotion portion in the range from the guiding promotion portion to the guide surface and in a direction parallel to the bottom surface The binding machine according to Claim 1.

3. The guiding promotion portion is provided across one side surface of the pair of side surfaces to the other side surface The binding machine according to Claim 1.

4. The guiding promotion portion is provided at the opening end of the bottom surface The binding machine according to Claim 3.

5. The guiding promotion portion is integrally formed with the bottom surface The binding machine according to Claim 3.

6. The guiding promotion portion is formed by attaching an independent component to the bottom surface The binding machine according to Claim 3.

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