Bundling machine

Abstract

A binding machine is provided that can reliably feed binding wire regardless of the entry angle of the binding wire. The rebar binding machine (1A) includes: a binding wire feed section (3A) for feeding binding wire (W) wound toward a rebar (S); a binding section (7A) for twisting the binding wire wound around the rebar; a coiling guide (50) for creasing the binding wire fed by the binding wire feed section; and an induction guide (51) for inducing the binding wire creasing by the coiling guide toward the binding section. The induction guide (51) includes: an induction promoting section (57a) that contacts the binding wire from the radially outer side of a loop (Ru) formed by the binding wire creasing by the coiling guide, and applies a force to the binding wire to change the feed path of the binding wire; and an induction recess (57b) provided downstream of the induction promoting section relative to the feed direction of the binding wire, for the binding wire extending radially outward toward the loop (Ru) to enter.

Description

Technical Field

[0001] This invention relates to a binding machine that uses binding wire to bind reinforcing bars and other binding materials. Background Technology

[0002] Previously, a binding machine called a rebar binding machine was proposed, which uses binding wire to bind two or more rebars by winding binding wire around them and twisting the binding wire.

[0003] The binding machine winds binding wire around the reinforcing bar by feeding it with the driving force of an electric motor through a guide called a curling guide or the like, which inflates the binding wire. The incised binding wire is then guided to a binding section for twisting the binding wire by a guide called an induction guide or the like, and the binding section twists the binding wire wound around the reinforcing bar, thereby binding the reinforcing bar with the binding wire.

[0004] The guide used to guide the creased binding wire toward the binding section is a shape in which the gap between a pair of walls gradually narrows from the front end side to the rear end side where the binding wire enters (for example, see Patent Document 1). Thus, the binding wire entering the guide used to guide the creased binding wire toward the binding section is guided in a manner that the gap between the pair of walls gradually narrows.

[0005] Existing technical documents

[0006] Patent Document 1: International Publication No. 2017 / 014270 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] If the entry angle of the binding wire into the guide that guides the binding section increases, the contact angle between the binding wire and one of the two wall surfaces will also increase when the tip of the binding wire contacts it. If the contact angle between the binding wire and the wall surface increases, the frictional resistance as the binding wire slides along the wall surface will increase, making it impossible to feed the binding wire.

[0009] This invention was made to solve such a problem, and its purpose is to provide a strapping machine that can reliably feed strapping wires regardless of the angle at which the strapping wires enter.

[0010] Technical solutions for solving the problem

[0011] To address the aforementioned issues, the present invention provides a strapping machine comprising: a strapping wire feed section for feeding strapping wire wound onto a bundled object; a strapping section for twisting the strapping wire wound onto the bundled object; a curling guide for applying a curl mark to the strapping wire fed by the strapping wire feed section; and an induction guide for guiding the strapping wire with the curl mark applied by the curling guide toward the strapping section. The induction guide comprises: an induction promoting section that contacts the strapping wire from the radially outer side of a loop formed by the strapping wire with the curl mark applied by the curling guide, applying a force to the strapping wire to change its feed path; and an induction recess disposed downstream of the induction promoting section relative to the feed direction of the strapping wire, for the strapping wire extending radially outward toward the loop to enter.

[0012] In this invention, the binding wire induced by the guiding member extends in a direction where the diameter of the ring gradually increases and enters the guiding recess, thereby contacting the guiding promotion part on the upstream side of the guiding recess relative to the feeding direction of the binding wire.

[0013] Invention Effects

[0014] The binding wire, guided by the guiding member, comes into contact with the guiding and promoting section, thereby altering the feeding path of the binding wire. Thus, the binding wire can be guided to the binding section regardless of its entry angle into the guiding member. Attached Figure Description

[0015] Figure 1A This is an internal structure diagram viewed from another side, showing an example of the overall structure of the rebar tying machine of this embodiment.

[0016] Figure 1B This is a front sectional view showing an example of the overall structure of the rebar tying machine of this embodiment.

[0017] Figure 2A This is an overall perspective view showing an example of the guiding element of this embodiment.

[0018] Figure 2B This is a side sectional view of the main part of an example of the guiding section of this embodiment.

[0019] Figure 2C This is a top view showing an example of the guiding section of this embodiment.

[0020] Figure 3A This is a side view showing the main structural components of the rebar tying machine according to this embodiment.

[0021] Figure 3B This is a top view showing the main structural components of the rebar tying machine according to this embodiment.

[0022] Figure 3CThis is a top sectional view showing the main structural components of the rebar tying machine according to this embodiment.

[0023] Figure 4A This is an explanatory diagram showing the movement of the binding wire in the guide element.

[0024] Figure 4B This is an explanatory diagram showing the movement of the binding wire in the guide element.

[0025] Figure 4C This is an explanatory diagram showing the movement of the binding wire in the guide element. Detailed Implementation

[0026] Hereinafter, an example of a rebar tying machine that is an embodiment of the tying machine of the present invention will be described with reference to the accompanying drawings.

[0027] <Structural Example of the Rebar Binding Machine in This Embodiment>

[0028] Figure 1A This is an internal structure diagram showing an example of the overall structure of the rebar tying machine according to this embodiment, viewed from another side. Figure 1B This is a front sectional view showing an example of the overall structure of the rebar tying machine of this embodiment.

[0029] The rebar tying machine 1A is a handheld type, comprising a main body 10A and a handle 11A. The rebar tying machine 1A feeds the binding wire W in the forward direction (indicated by arrow F) and winds it around the rebar S, which is to be tied. Then, it feeds the binding wire W in the reverse direction (indicated by arrow R) and winds it around the rebar S again, cuts it, and twists the binding wire W to tie the rebar S.

[0030] To achieve the above functions, the rebar tying machine 1A includes: a feeder 2A for storing tying wire W; a tying wire feeder 3A for feeding the tying wire W; and a tying wire guide 4A for guiding the tying wire W fed by the tying wire feeder 3A. Furthermore, the rebar tying machine 1A includes: a coiling forming section 5A for forming a path for winding the tying wire W fed by the tying wire feeder 3A around the rebar S; and a cutting section 6A for cutting the tying wire W wound around the rebar S. The rebar tying machine 1A also includes: a binding section 7A for twisting the tying wire W wound around the rebar S; and a drive section 8A for driving the binding section 7A.

[0031] The cassette 2A is an example of a receiving unit, which stores a reel 20 containing long strips of binding wire W that can be unwound in a rotatable and detachable manner. The binding wire W is made of metal wire that can be plastically deformed, metal wire coated with resin, or stranded wire. The reel 20 winds one or more binding wires W around a hub (not shown), and one or more binding wires W can be pulled out of the reel 20 at the same time.

[0032] like Figure 1B As shown, in the hopper 2A, the reel 20 is installed in a state that is offset in one direction relative to the feed path FL of the binding wire W as defined by the binding wire guide 4A described later.

[0033] The binding wire feeding unit 3A includes: a pair of feed gears 30 that clamp and feed one or more binding wires W in parallel; and a feed motor 31 that drives the feed gears 30. In the binding wire feeding unit 3A, the rotational motion of the feed motor 31 is transmitted to the feed gears 30 via a transmission mechanism (not shown) to cause the feed gears 30 to rotate.

[0034] Thus, the binding wire feed unit 3A feeds the binding wire W, which is held between a pair of feed gears 30, along the extension direction of the binding wire W. In a structure that feeds multiple binding wires, such as two binding wires W, the two binding wires W are fed in a parallel manner.

[0035] The binding wire feed unit 3A switches the rotation direction of the feed gear 30 by switching the rotation direction of the feed motor 31, and the feeding direction of the binding wire W is switched to a positive direction and an opposite direction.

[0036] The binding wire guide 4A is positioned at predetermined positions upstream and downstream of the binding wire feed section 3A relative to the feed direction of the binding wire W in the positive direction. In the structure that feeds two binding wires W, the binding wire guide 4A restricts the radial direction of the two binding wires W and guides the two incoming binding wires W side by side between a pair of feed gears 30.

[0037] In the binding wire guide 4A, the opening on the downstream side relative to the feed direction of the binding wire W in the positive direction has a shape that restricts the radial direction of the binding wire W. In contrast, the opening on the upstream side relative to the feed direction of the binding wire W in the positive direction has a larger opening area than the opening on the downstream side.

[0038] The coiling forming section 5A includes: a coiling guide 50, which imparts a coiling mark to the binding wire W fed by the binding wire feed section 3A; and an induction guide 51, which guides the binding wire W, which has been imparted a coiling mark by the coiling guide 50, toward the binding section 7A. In the rebar binding machine 1A, the path of the binding wire W fed by the binding wire feed section 3A is restricted by the coiling forming section 5A, thereby making the trajectory of the binding wire W as follows: Figure 1A The loop Ru shown by the double-dotted line has binding wire W wrapped around the reinforcing bar S.

[0039] Figure 2A This is an overall perspective view showing an example of the guiding element of this embodiment. Figure 2B This is a side sectional view of the main part of an example of the guiding section of this embodiment. Figure 2C This is a top view showing a main part of an example of the guiding section of this embodiment. Next, the guiding member 51 of this embodiment will be described. The guiding member 51 is provided at a position that is offset in the opposite direction to the direction in which the feed path FL of the binding wire W defined by the binding wire guide 4A is biased toward the reel 20.

[0040] The guiding member 51 includes: a first guiding portion 52, which restricts the axial position of the loop Ru formed by the binding wire W, which has been crimped by the crimping guide 50; and a second guiding portion 53 and a third guiding portion 54, which restrict the radial position of the loop Ru formed by the binding wire W.

[0041] The first guide portion 52 and the second guide portion 53 are disposed on the side where the binding wire W, which has been creased by the curling guide 50, is introduced relative to the third guide portion 54.

[0042] The first guide portion 52 has a side portion 52b on one side, which is located in a direction offset from the reel 20. In addition, the first guide portion 52 has a side portion 52a on the other side, facing the side portion 52b, which is located in a direction opposite to the direction offset from the reel 20.

[0043] The second guide portion 53 has a side portion 52b erected on one side and a side portion 52a erected on the other side, and has a bottom portion 53a that connects the side portion 52a and the side portion 52b.

[0044] The third guide portion 54 has a guide surface 54a on the radially outer side of the ring Ru formed by the binding wire W. The guide surface 54a is composed of a surface that extends toward the binding portion 7A along the feed direction of the binding wire W.

[0045] The guiding member 51 forms a bundle passage 55 through a space surrounded by a pair of side portions 52a, 52b and a bottom portion 53a. Furthermore, the guiding member 51 has an open end portion 55a for the binding wire W to enter the bundle passage 55. The open end portion 55a opens within the space surrounded by the pair of side portions 52a, 52b and the bottom portion 53a.

[0046] In the first guide portion 52, the distance between the side portion 52a and the side portion 52b is widest at the opening end portion 55a, and narrows as it moves from the opening end portion 55a toward the guide surface 54a of the third guide portion 54, forming the narrowest portion 55b.

[0047] The guide member 51 has an entry angle limiting part 56, which changes the entry angle of the binding wire W into the bundle passage 55 to the narrowest part 55b.

[0048] In the rebar tying machine 1A, the reel 20 is positioned biased in one direction. The binding wire W, fed from the reel 20 biased in that direction by the binding wire feed section 3A and crimped by the coiling guide 50, is directed in the opposite direction to the biased direction of the reel 20, i.e., another direction.

[0049] Therefore, the binding wire W entering the bundle passage 55 between the side portions 52a and 52b of the first guide portion 52 first enters towards the side portion 52a. The leading tip of the binding wire W entering towards the side portion 52a is oriented towards the narrowest part 55b of the bundle passage 55. Therefore, an entry angle limiting part 56 is provided on the side portion 52b facing the side portion 52a.

[0050] The angle limiting part 56 is configured such that the middle of the binding wire W in the side part 52b in the entry direction is convex in the direction of the side part 52b.

[0051] The guiding member 51 includes a guiding promotion section 57a, which contacts the binding wire W from the radially outer side of the loop Ru formed by the binding wire W with a curled edge imposed by the curled guide 50, and applies a force to the binding wire W to change the feed path of the binding wire W. Additionally, the guiding member 51 has a guiding recess 57b between the guiding promotion section 57a ​​and the third guiding section 54 for the binding wire W, which extends radially outward toward the loop Ru, to enter.

[0052] The induction promoting section 57a ​​is constructed by providing a protrusion protruding in the direction of the curling guide 50 on the bottom part 53a of the second guide section 53, which is composed of a plane. The induction promoting section 57a ​​is provided on the side closer to the opening end 55a than the center of the bottom part 53a along the feed direction of the binding wire W. In this example, it is provided along the entire width of the opening end 55a.

[0053] The induction promoting section 57a ​​is constructed by integrally forming a convex component with a predetermined cross-sectional shape such as a triangle with the bottom surface 53a, or by mounting a component separate from the bottom surface 53a onto the bottom surface 53a. Alternatively, the induction promoting section 57a ​​may be constructed by a rotating component such as a roller having a shaft extending along the opening end 55a and capable of contacting the binding wire W. The protrusion height of the induction promoting section 57a ​​from the bottom surface 53a is such that it will not come into contact with the tip of the binding wire W, which is creased by the curling guide 50 and induced by the induction guide 51.

[0054] The induction recess 57b is located downstream of the induction promoting part 57a relative to the feeding direction of the binding wire W which is fed in the positive direction, and is formed by the bottom part 53a of the second guide part 53 which is concave to the radially outer side of the ring Ru formed by the binding wire W relative to the induction promoting part 57a.

[0055] The binding wire, with curled edges provided by the curling guide 50, is introduced between a pair of side portions 52a and 52b of the first guide portion 52. In the induction guide 51, the diameter of the loop Ru formed by the binding wire W expands in an increasing direction, and the binding wire W contacts the induction promoting portion 57a ​​of the second guide portion 53, thus changing the direction of entry of the binding wire W. Consequently, the binding wire W introduced between the pair of side portions 52a and 52b of the first guide portion 52 is induced by the third guide portion 54.

[0056] The cutting unit 6A includes: a fixed blade part 60, a movable blade part 61 that cuts the binding wire W in cooperation with the fixed blade part 60, and a transmission mechanism 62 that transmits the motion of the binding unit 7A to the movable blade part 61. The cutting unit 6A cuts the binding wire W by rotating the movable blade part 61 with the fixed blade part 60 as the fulcrum.

[0057] The binding section 7A includes a binding wire catcher 70 for catching the binding wire W and a rotating shaft 72 for actuating the binding wire catcher 70. The drive section 8A includes a motor 80 and a reducer 81 for speed reduction and torque amplification. The rotating shaft 72 of the binding section 7A is connected to the motor 80 of the drive section 8A via the reducer 81, and the rotating shaft 72 is driven by the motor 80 via the reducer 81.

[0058] In the rebar tying machine 1A, the curling guide 50 and the induction guide 51 of the aforementioned curling forming section 5A are provided on one side along the axial direction of the rotation axis 72, i.e., at the front end of the main body section 10A. Furthermore, the rebar tying machine 1A has a feed restriction section 90 that abuts against the front end of the binding wire W on the feed path of the binding wire W, which is guided by the curling forming section 5A and held by the binding wire stopper 70. Moreover, in the rebar tying machine 1A, the contact section 91 that abuts against the rebar S is provided between the curling guide 50 and the induction guide 51 at the front end of the main body section 10A.

[0059] The handle 11A of the rebar tying machine 1A extends downward from the main body 10A. A removable battery 15A is also installed at the lower part of the handle 11A. Furthermore, the feed hopper 2A of the rebar tying machine 1A is located in front of the handle 11A. The rebar tying machine 1A houses the aforementioned binding wire feeder 3A, cutting section 6A, binding section 7A, and drive unit 8A for driving the binding section 7A within the main body 10A.

[0060] The rebar tying machine 1A has a trigger 12A on the front side of the handle 11A and a switch 13A inside the handle 11A. In the rebar tying machine 1A, the control unit 14A controls the motor 80 and the feed motor 31 according to the state of the switch 13A pressed by the operation of the trigger 12A.

[0061] Figure 3A This is a side view showing the main structural components of the rebar tying machine according to this embodiment. Figure 3B This is a top view showing the main structural components of the rebar tying machine according to this embodiment. Figure 3C This is a top sectional view showing the main structural components of the rebar tying machine according to this embodiment. Next, the details of the tying section 7A and the connection structure between the tying section 7A and the drive section 8A will be explained with reference to the figures.

[0062] The binding section 7A includes a binding wire catcher 70 for catching the binding wire W and a rotating shaft 72 for actuating the binding wire catcher 70. The rotating shaft 72 of the binding section 7A is connected to the motor 80 of the drive section 8A via a reducer 81, and the rotating shaft 72 is driven by the motor 80 via the reducer 81.

[0063] The cable tie stop 70 includes: 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 operates the first side hook 70L and the second side hook 70R in conjunction with the rotation of the rotating shaft 72.

[0064] In the binding section 7A, the side with the center hook 70C, the first side hook 70L, and the second side hook 70R is designated as the front side, and the side where the rotating shaft 72 is connected to the reducer 81 is designated as the rear side.

[0065] The center hook 70C is connected to one end, or front end, of the rotating shaft 72 via a structure that is rotatable relative to the rotating shaft 72 and is axially movable integrally with the rotating shaft 72.

[0066] One end of the first side hook 70L along the axial direction of the rotation axis 72, namely the front end, is located on one side relative to the center hook 70C. In addition, the other end of the first side hook 70L along the axial direction of the rotation axis 72, namely the rear end, is rotatably supported to the center hook 70C by the shaft 71b.

[0067] One end of the second side hook 70R along the axial direction of the rotation axis 72, namely the front end side, is located on the other side relative to the center hook 70C. In addition, the other end of the second side hook 70R along the axial direction of the rotation axis 72, namely the rear end side, is rotatably supported to the center hook 70C by the shaft 71b.

[0068] Therefore, in the binding wire stop 70, through rotation about the axis 71b, the front end of the first side hook 70L opens and closes in the direction of approaching and leaving the center hook 70C. Similarly, the front end of the second side hook 70R opens and closes in the same direction.

[0069] The rotating shaft 72 is connected to the reducer 81 at its other end, i.e., its rear end, via a connecting portion 72b having a structure capable of rotating integrally with the reducer 81 and moving axially relative to the reducer 81. The connecting portion 72b includes a spring 72c, which applies a force to the rotating shaft 72 in a direction approaching the reducer 81, i.e., rearward, thus limiting the axial position of the rotating shaft 72. Therefore, the rotating shaft 72 is configured to move forward in a direction away from the reducer 81 while being pushed rearward by the spring 72c. Thus, when a force is applied to the cable ties 70 to move it axially forward, the rotating shaft 72 can move forward while being pushed rearward by the spring 72c.

[0070] The sleeve 71 is radially divided into two parts along a predetermined length from the end in the forward direction indicated by arrow A1, extending along the axial direction of the rotation shaft 72. It is shaped such that the first side hook 70L and the second side hook 70R can be opened and closed. Furthermore, the sleeve 71 has a (not shown) protrusion projecting into the inner circumferential surface of a cylindrical space covering the periphery of the rotation shaft 72 and into which the rotation shaft 72 is inserted. This protrusion enters a groove in the feed screw 72a formed axially along the outer circumference of the rotation shaft 72. When the rotation shaft 72 rotates, the sleeve 71 moves in the axial direction (forward and backward) according to the rotation direction of the rotation shaft 72, through the (not shown) protrusion and the action of the feed screw 72a. Additionally, the sleeve 71 rotates integrally with the rotation shaft 72.

[0071] The sleeve 71 has an opening and closing pin 71a for opening and closing the first side hook 70L and the second side hook 70R.

[0072] The opening / closing pin 71a is inserted into the opening / closing guide hole 73 provided in the first side hook 70L and the second side hook 70R. The opening / closing guide hole 73 has a shape that extends along the moving direction of the sleeve 71 and converts the linear motion of the opening / closing pin 71a, which moves in conjunction with the sleeve 71, into an opening / closing action based on the rotation of the first side hook 70L and the second side hook 70R with the shaft 71b as the fulcrum.

[0073] The binding wire stop 70 moves in the rear direction indicated by arrow A2 through the sleeve 71, while the first side hook 70L and the second side hook 70R move away from the center hook 70C by rotating about the axis 71b through the trajectory of the opening and closing pin 71a and the shape of the opening and closing guide hole 73.

[0074] As a result, the first side hook 70L and the second side hook 70R open relative to the center hook 70C, forming a feeding path for the binding wire W to pass through between the first side hook 70L and the center hook 70C, and between the second side hook 70R and the center hook 70C.

[0075] With the first side hook 70L and the second side hook 70R open relative to the center hook 70C, the binding wire W fed by the binding wire feed section 3A passes between the center hook 70C and the first side hook 70L. The binding wire W passing between the center hook 70C and the first side hook 70L is induced to the curling forming section 5A. Then, the binding wire W, which is crimped by the curling forming section 5A and induced to the binding section 7A, passes between the center hook 70C and the second side hook 70R.

[0076] In the binding wire stop body 70, the sleeve 71 moves forward in the direction indicated by arrow A1, and the first side hook 70L and the second side hook 70R move towards the center hook 70C through a rotational motion about the shaft 71b, following the trajectory of the opening and closing pin 71a and the shape of the opening and closing guide hole 73. Thus, the first side hook 70L and the second side hook 70R are closed relative to the center hook 70C.

[0077] When the first side hook 70L is closed relative to the center hook 70C, the binding 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 is closed relative to the center hook 70C, the binding wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a manner that prevents it from coming loose from between the second side hook 70R and the center hook 70C.

[0078] The binding wire stop body 70 has a bending portion 71c1, which bends the binding wire W into a predetermined shape by pressing one end, i.e., the front end, laterally in a predetermined direction. Additionally, the binding wire stop body 70 has a bending portion 71c2, which bends the binding wire W into a predetermined shape by pressing the other end, i.e., the end end, of the binding wire W cut by the cutting portion 6A laterally in a predetermined direction.

[0079] The sleeve 71 is divided into two parts at the front end indicated by arrow A1, which clamps the first side hook 70L, the second side hook 70R, and the central hook 70C. In the non-rotating region, a curved portion 71c1 is formed at the front end located on the upper side, and a curved portion 71c2 is formed at the front end located on the lower side.

[0080] After the binding wire W is cut by the cutting part 6A, the sleeve 71 moves further in the forward direction indicated by arrow A1, and uses the bending part 71c1 to press the front end side of the binding wire W, which is held by the center hook 70C and the second side hook 70R, causing the front end side of the binding wire W to bend towards the reinforcing bar S. Additionally, the sleeve 71 uses the bending part 71c2 to press the end side of the binding wire W, which is held by the center hook 70C and the first side hook 70L and cut by the cutting part 6A, causing the end side of the binding wire W to bend towards the reinforcing bar S.

[0081] The binding part 7A includes a rotation limiting part 74, which limits the rotation of the binding wire catch 70 and the sleeve 71, which are linked to the rotation of the rotation shaft 72. The rotation limiting part 74 has a rotation limiting blade 74a on the sleeve 71 and a rotation limiting claw 74b on the main body 10A.

[0082] The rotation limiting blade 74a is constructed by providing a plurality of protrusions at predetermined intervals on the circumference of the sleeve 71, which protrude radially from the outer periphery of the sleeve 71. The rotation limiting blade 74a is fixed to the sleeve 71 and moves and rotates integrally with the sleeve 71.

[0083] After the binding wire W is secured by the binding wire catcher 70 and wound around the reinforcing bar S, it is cut by the cutting part 6A. Further, the binding wire W is bent into shape by the bending parts 71c1 and 71c2 of the sleeve 71. In this operating area, the rotation limiting part 74 causes the rotation limiting blade 74a to engage with the rotation limiting claw 74b. When the rotation limiting blade 74a engages with the rotation limiting claw 74b, the rotation of the sleeve 71, which is linked to the rotation of the rotation shaft 72, is restricted. Through the rotation of the rotation shaft 72, the sleeve 71 moves forward and backward.

[0084] Furthermore, in the operating region where the binding wire W, which is held in place by the binding wire catcher 70, is twisted, the rotation limiting part 74 releases the locking of the rotation limiting blade 74a and the rotation limiting claw 74b. When the locking of the rotation limiting blade 74a and the rotation limiting claw 74b is released, the sleeve 71 rotates in conjunction with the rotation of the rotation shaft 72. The rotational linkage between the binding wire catcher 70 and the sleeve 71 locks the rotation of the center hook 70C, the first side hook 70L, and the second side hook 70R of the binding wire W. The operating region in which the binding wire catcher 70 locks the binding wire W in the operating region of the sleeve 71 and the binding wire catcher 70 along the axial direction of the rotation shaft 72 is called the first operating region. Furthermore, the operating region in which the binding wire W, held in place by the binding wire catcher 70, is twisted in the first operating region is called the second operating region.

[0085] The binding part 7A is configured such that the movable part 83 can move in conjunction with the sleeve 71. The movable part 83 is rotatably mounted relative to the sleeve 71, and moves in the front-back direction in conjunction with the sleeve 71 without being linked to the rotation of the sleeve 71.

[0086] The moving part 83 has an engaging portion 83a that engages with the transmission mechanism 62. In the binding part 7A, when the moving part 83 moves in the front-to-back direction in conjunction with the sleeve 71, the transmission mechanism 62 transmits the motion of the moving part 83 to the movable blade part 61, causing the movable blade part 61 to rotate. As a result, through the forward movement of the sleeve 71, the movable blade part 61 rotates in a predetermined direction, and the binding wire W is cut.

[0087] The binding part 7A includes a tension applying spring 92 that enables binding while tension is applied to the binding wire W. The tension applying spring 92 is located on the outside of the sleeve 71 and applies force to the sleeve 71 and the binding wire catch 70 in a direction that moves away from the abutment part 91 along the axial direction of the rotation axis 72. The tension applying spring 92 is, for example, a helical spring that extends and retracts axially, and is fitted around the outer periphery of the sleeve 71 between the rotation limiting blade 74a and the support frame 76d that supports the sleeve 71 in a rotatable and axially sliding manner.

[0088] The tension applying spring 92 is compressed between the support frame 76d and the rotation limiting blade 74a according to the position of the sleeve 71 along the axial direction of the rotation axis 72, and applies force to the sleeve 71 in the direction away from the abutment portion 91 along the axial direction of the rotation axis 72, i.e., rearward. As a result, the tension applying spring 92 applies force to the binding wire catch 70 equipped with the sleeve 71 in the direction of maintaining the tension applied to the binding wire W by feeding the binding wire W in the opposite direction and winding it around the reinforcing bar S.

[0089] Therefore, when the tension-applying spring 92 is compressed as the sleeve 71 moves forward, it applies tension to the binding wire W, which is cut by the cutting part 6A after being wound around the reinforcing bar S, with a force greater than the force applied to the direction in which the binding wire W is relaxed while wound around the reinforcing bar S. Thus, binding can be performed while tension is applied to the cut binding wire W.

[0090] In addition, the cable tie 70 is configured such that the sleeve 71 is subjected to a force that is pushed backward by the tension spring 92, and the rotating shaft 72 can move forward while being pushed backward by the spring 72c.

[0091] <Example of the operation of the rebar tying machine in this embodiment>

[0092] Next, referring to the figures, the operation of the steel bar S being tied by the steel bar tying machine 1A with tying wire W in this embodiment will be explained.

[0093] The reinforcing bar S is placed between the coiling guide 50 and the induction guide 51 of the coiling forming section 5A. When the trigger 12A is operated, the feed motor 31 is driven in the forward direction, and the binding wire W is fed in the forward direction indicated by the arrow F through the binding wire feed section 3A.

[0094] In the case of a structure that uses multiple, for example two, binding wires W to bind the reinforcing bar S, the two binding wires W are fed side by side along the axial direction of the ring Ru formed by the binding wires W by the binding wire guide 4A.

[0095] The binding wire W, fed in the positive direction, passes between the center hook 70C and the first side hook 70L and is fed to the coiling guide 50 of the coiling forming section 5A. The binding wire W passes through the coiling guide 50, thereby being given a coiled groove around the reinforcing bar S.

[0096] The binding wire W, which has been given curl marks by the curling guide 50, is guided by the guiding guide 51. Figure 4A , Figure 4B , Figure 4C This is an explanatory diagram showing the movement of the binding wire in the guide member. Next, the effect of guiding the binding wire W using the guide member 51 will be explained.

[0097] like Figure 4A As shown, the binding wire W, which is creased by the curling guide 50 and guided by the guiding guide 51, passes through the guiding guide 51 along a path exiting from the bottom portion 53a of the second guide portion 53. Furthermore, the binding wire W, creased by the curling guide 50, is oriented in the opposite direction to the direction biased against the spool 20, i.e., another direction. Therefore, in the guiding guide 51, the binding wire W that enters between the side portions 52a and 52b of the first guide portion 52 first enters towards the side portion 52a.

[0098] In the guiding member 51, when the tip WS of the binding wire W entering towards the side portion 52a contacts the side portion 52a, the resistance to the tip WS of the binding wire W as it is guided along the side portion 52a increases. As the amount of movement of the tip WS of the binding wire W along the side portion 52a decreases due to the resistance caused by friction, and the feed amount of the binding wire W fed in the positive direction relatively increases, the diameter of the loop Ru formed by the binding wire W with the curled edge imparted by the curling guide 50 gradually increases.

[0099] As the diameter of the loop Ru gradually increases due to the induction guide 51, the binding wire W guided by the induction guide 51 can form a path that enters the induction recess 57b until it contacts the bottom part 53a of the second guide 53.

[0100] Therefore, as Figure 4B As shown, the diameter of the loop Ru of the binding wire W, which is guided by the guiding member 51 and whose front end WS contacts the side part 52a, gradually increases and enters the guiding recess 57b, thereby contacting the guiding promotion part 57a on the upstream side of the guiding recess 57b relative to the feeding direction of the binding wire W.

[0101] The binding wire W, induced by the guiding member 51, comes into contact with the induction promoting part 57a, thereby altering the feed path of the binding wire W as it enters towards the side part 52a. As a result, the binding wire W, induced by the guiding member 51, is further fed in the positive direction, and thus, the leading edge WS is induced to move away from the side part 52a, as... Figure 4C As shown, it can be guided toward the narrowest part 55b towards the third guide part 54b.

[0102] Furthermore, even before contacting the ingress angle limiting part 56, the binding wire W, guided by the guiding member 51 and with its front end WS in contact with the side part 52a, also experiences a force that alters the feed path of the binding wire W as it enters the side part 52a. As a result, the binding wire W, guided by the guiding member 51, is further fed in the positive direction, thereby guiding the front end WS away from the side part 52a and allowing it to be guided towards the third guiding part 54b into the narrowest part 55b.

[0103] The binding wire W, with curls instilled by the curling guide 50, is guided by the guiding guide 51 and further fed in the positive direction by the binding wire feed section 3A, thereby being guided by the guiding guide 51 to the space between the center hook 70C and the second side hook 70R. Then, the binding wire W is fed until its tip abuts against the feed restriction section 90. When the tip of the binding wire W is fed to the position abutting against the feed restriction section 90, the drive of the feed motor 31 is stopped.

[0104] After the feeding of the binding wire W in the forward direction stops, the motor 80 is driven in the forward direction. In the first operating region where the binding wire W is stopped by the binding wire catcher 70, the sleeve 71's rotation is restricted by engaging the rotation limiting blade 74a with the rotation limiting pawl 74b, thereby limiting the rotation of the sleeve 71, which is linked to the rotation of the rotation shaft 72. Thus, the rotation of the motor 80 is converted into linear movement, and the sleeve 71 moves in the direction of arrow A1, which is the forward direction.

[0105] 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 moves towards the center hook 70C through a rotational motion about the shaft 71b. When the first side hook 70L is closed relative to the center hook 70C, the binding wire W between the first side hook 70L and the center hook 70C is locked in a position that allows it to move between the two hooks.

[0106] Additionally, the second side hook 70R moves toward the center hook 70C via a rotational motion about the axis 71b. When the second side hook 70R is closed relative to the center hook 70C, the binding wire W between the second side hook 70R and the center hook 70C is locked in a manner that prevents it from coming out of the space between the second side hook 70R and the center hook 70C.

[0107] After the sleeve 71 is advanced to the position where the binding wire W is locked by the action of closing 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 direction.

[0108] As a result, the pair of feed gears 30 reverse, and the binding wire W held between the pair of feed gears 30 is fed in the opposite direction as indicated by arrow R. Since the front end of the binding wire W is locked in a way that it will not come out from between the second side hook 70R and the center hook 70C, the binding wire W is wound around the reinforcing bar S by the action of feeding the binding wire W in the opposite direction.

[0109] After the binding wire W is wound around the reinforcing bar S and the reverse direction of the feed motor 31 is stopped, the motor 80 is driven in the forward direction, thereby moving the sleeve 71 in the forward direction as indicated by arrow A1.

[0110] The forward movement of the sleeve 71 is transmitted to the cutting section 6A by the transmission mechanism 62, thereby rotating the movable blade section 61. The binding wire W, which is held in place by the first side hook 70L and the center hook 70C, is cut off by the movement of the fixed blade section 60 and the movable blade section 61.

[0111] When the binding wire W is cut, the tension applied to the binding wire W is released, and the sleeve 71 moves forward. If the sleeve 71 moves forward, the force pulling the binding wire W backward by the binding wire catcher 70 is reduced, and the binding wire W wound around the reinforcing bar S loosens before twisting.

[0112] In contrast, in this embodiment, in the rebar tying machine 1A, during the action area where the sleeve 71 and the tying wire stop 70 move forward to cut the tying wire W, the rotation limiting blade 74a contacts the tension applying spring 92. The tension applying spring 92 is compressed between the support frame 76d and the rotation limiting blade 74a, and the sleeve 71 and the tying wire stop 70 are forced backward by the tension applying spring 92.

[0113] Therefore, by suppressing the forward movement of the sleeve 71, the force that pulls the binding wire W, which is held in place by the binding wire stopper 70, backward is suppressed, thereby suppressing the binding wire W wound around the reinforcing bar S from becoming loose before twisting.

[0114] By driving the motor 80 in the forward direction, the sleeve 71 moves forward as indicated by arrow A1, cutting the binding wire W. Almost simultaneously, the bending portion 71c1 moves towards the reinforcing bar S. As a result, the bending portion 71c1 pushes the front end of the binding wire W, which is held by the center hook 70C and the second side hook 70R, towards the reinforcing bar S, causing the front end of the binding wire W to bend towards the reinforcing bar S with the holding position as the fulcrum. Further forward movement of the sleeve 71 maintains the binding wire W, held between the second side hook 70R and the center hook 70C, in a state clamped by the bending portion 71c1.

[0115] Furthermore, the bending portion 71c2 further presses the end of the binding wire W, which is held between the first binding wire holding portion 71c2a and the second binding wire holding portion 71c2b of the bending portion 71c2 constituting the sleeve 71 and the anti-detachment portion 70La of the first side hook 70L and has been cut by the cutting portion 6A, toward the reinforcing bar S. This causes the end of the binding wire W to bend toward the reinforcing bar S with the locking position as the fulcrum. By moving the sleeve 71 further forward, the binding wire W, which is locked between the first side hook 70L and the center hook, is held in a state clamped by the bending portion 71c2.

[0116] After the front and rear ends of the binding wire W are bent toward the reinforcing bar S, the motor 80 is driven further in the forward direction, thereby moving the sleeve 71 further forward. When the sleeve 71 moves to the predetermined position and reaches the area where the binding wire W, which is held in place by the binding wire catcher 70, is twisted, the locking of the rotation limiting blade 74a and the rotation limiting claw 74b is released.

[0117] Thus, the sleeve 71 rotates in conjunction with the rotating shaft 72 as the electric motor 80 drives it further in the forward direction, causing the binding wire W, which is held in place by the binding wire catcher 70, to be twisted.

[0118] In the second operating region where the sleeve 71 rotates and the binding wire W twists, the binding part 7A twists the binding wire W, which is held in place by the binding wire catcher 70, thereby applying a force to the binding wire catcher 70 that pulls it forward along the axial direction of the rotation axis 72. On the other hand, as the sleeve 71 moves forward to a rotatable position, the tension applying spring 92 is further compressed, and the sleeve 71 is subjected to a force that pushes it backward by the tension applying spring 92.

[0119] Therefore, when a force is applied to the binding wire stop 70 to move the binding wire stop 70 forward along the axial direction, the sleeve 71 is pushed backward by the tension spring 92, and the rotating shaft 72 moves forward while being pushed backward by the spring 72c. Thus, the binding wire stop 70 and the rotating shaft 72 twist the binding wire W while moving forward.

[0120] As a result, the portion of the binding wire W that is secured by the binding wire catcher 70 is pulled backward, applying tension in the tangential direction of the reinforcing bar S, and the binding wire W is pulled to fit tightly against the reinforcing bar S. In the second operating region where the sleeve 71 rotates and twists the binding wire W, when the binding wire catcher 70 and the rotating shaft 72 rotate further in conjunction, the binding wire catcher 70 and the rotating shaft 72 move forward in the direction where the gap between the twisted portion of the binding wire W and the reinforcing bar S decreases, while further twisting the binding wire W.

[0121] Therefore, the binding wire W is twisted while moving forward under the force of the tensioned springs 92 and 72c pushing it backward on the binding wire catch 70 and the rotating shaft 72. As a result, the gap between the twisted part of the binding wire W and the reinforcing bar S is reduced, so that it fits tightly against the reinforcing bar S along its shape. This eliminates the slack before twisting the binding wire W, and the binding is performed while the binding wire W is in close contact with the reinforcing bar S.

[0122] When the load applied to the motor 80 due to the twisting of the binding wire W is detected to have reached its maximum, the forward rotation of the motor 80 is stopped. Next, by driving the motor 80 in the reverse direction, the rotating shaft 72 reverses. As the sleeve 71 follows the reverse rotation of the rotating shaft 72, the rotation limiting blade 74a is engaged by the rotation limiting claw 74b, thereby limiting the rotation of the sleeve 71, which is linked to the rotation of the rotating shaft 72. As a result, the sleeve 71 moves in the direction of arrow A2, which is the rearward direction.

[0123] When the sleeve 71 moves rearward, the bent portions 71c1 and 71c2 disengage from the binding wire W, and the holding of the binding wire W by the bent portions 71c1 and 71c2 is released. Additionally, when the sleeve 71 moves rearward, the opening / closing pin 71a passes through the opening / closing guide hole 73. As a result, the first side hook 70L moves away from the center hook 70C through a rotational motion about the shaft 71b. Furthermore, the second side hook 70R moves away from the center hook 70C through a rotational motion about the shaft 71b. As a result, the binding wire W is disengaged from the binding wire catch 70.

[0124] Explanation of reference numerals in the attached figures

[0125] 1A…Rebar tying machine, 10A…Main body, 11A…Handle, 2A…Food box, 20…Reel, 3A…Binding wire feed, 30…Feed gear, 31…Feed motor, 4A…Binding wire guide, 5A…Curling forming part, 50…Curling guide, 51…Inducing guide, 52…First guide, 52a, 52b…Side part, 53…Second guide, 53a…Bottom part, 54…Third guide, 54a…Guiding surface, 55a…Opening end, 55b…Narrowest part, 56…Entry angle limiting part, 57a…Inducing promoting part, 57b…Inducing recess, 6A…Cutting part, 7A…Binding part, 70…Binding wire catch, 72…Rotating shaft, 8A…Drive part, 80…Motor, W…Binding wire.

Claims

1. A strapping machine, comprising: a strapping wire feeding section that feeds a strapping wire wound around a strapping object; a strapping section that twists the strapping wire wound around the strapping object; and an induction guide that induces the strapping wire, to which a crimp has been given by the crimping guide, toward the strapping section, the induction guide comprising: an induction promoting section that contacts the strapping wire from an outer side in a radial direction of a loop formed by the strapping wire to which the crimp has been given by the crimping guide, and applies a force that changes a feeding path of the strapping wire; an induction recess that is provided on a downstream side of the induction promoting section with respect to a feeding direction of the strapping wire, and into which the strapping wire that expands toward the outer side in the radial direction of the loop enters; a first guide section that has a pair of side surface sections that limit a position in an axial direction of the loop formed by the strapping wire to which the crimp has been given by the crimping guide; a second guide section that has a bottom surface section that connects the pair of side surface sections, and limits a position in a radial direction of the loop formed by the strapping wire; and an opening end section that is constituted at a space surrounded by the pair of side surface sections and the bottom surface section, and into which the strapping wire to which the crimp has been given by the crimping guide enters, the induction promoting section being provided at a position closer to the opening end section than a center of the bottom surface section in the feeding direction of the strapping wire, and protruding from the bottom surface section toward the crimping guide.

2. The strapping machine according to claim 1, wherein the induction promoting section is constituted by a protruding section that protrudes toward the crimping guide.

3. The strapping machine according to claim 1 or 2, wherein the induction promoting section is constituted by a rotating member that is capable of contacting the strapping wire. a curling guide that imparts a curl to the binding wire fed by the binding wire feeding section; ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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