End 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 binding machine that binds an object to be bound such as reinforcing bars with a wire. [[Background Art]]

[0002] Conventionally, binding machines called reinforcing bar binding machines have been proposed, which wind a wire around two or more reinforcing bars, twist the wire wound around the reinforcing bars, and bind the two or more reinforcing bars with the wire.

[0003] The binding machine winds the wire fed by the driving force of a motor around the reinforcing bars by passing the wire through a guide that imparts a curl to the wire, called a curl guide or the like. The curled wire is guided by a guide called a guide guide or the like to a binding portion that twists the wire, and the wire wound around the reinforcing bars is twisted by the binding portion, whereby the reinforcing bars are bound by the wire.

[0004] The guide that guides the curled wire to the binding portion has a shape in which the distance between a pair of wall surfaces gradually narrows from the leading end side where the wire enters toward the trailing end side (see, for example, Patent Document 1). Accordingly, the wire that has entered the guide for guiding the curled wire to the binding portion is guided along the pair of wall surfaces whose distance gradually narrows. [[Prior Art Documents]] [[Patent Documents]]

[0005] [[Patent Document 1]] International Publication No. 2017 / 014270 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0006] When the entry angle of the wire into the guide that directs it to the binding section increases, the angle at which the wire contacts one of the pair of walls increases when the tip of the wire touches one of the walls. When the contact angle of the wire with the wall increases, the frictional resistance when the wire slides along the wall increases, making it impossible to feed the wire.

[0007] This invention was made to solve these problems, and aims to provide a binding machine that can reliably feed the wire regardless of the wire's entry angle. [Means for solving the problem]

[0008] To solve the above-mentioned problems, the present invention comprises a wire feeding section for feeding a wire to be wound around a bundle, a curl guide for giving the wire fed by the wire feeding section a curl, a guide for guiding the wire that has been given a curl by the curl guide, and a bundling section for twisting the wire that has been guided by the guide guide, wherein the guide restricts the axial position of the loop formed by the wire that has been given a curl 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 restricting the radial position of the loop, and a guide-promoting section provided on the open end side of the bottom surface through which the wire enters, and protruding in the direction toward the curl guide from the bottom surface, The guidance promotion section is provided extending from one side of a pair of side sections to the other side section. In this binding machine, the height of the side section in the direction from the bottom section toward the curl guide is greater than the height of the protrusion from the bottom section of the guidance and promotion section.

[0009] In this invention, the wire guided by the guidance guide is introduced between a pair of side sections. The wire introduced between the pair of side sections expands in a direction in which the diameter of the loop gradually increases and comes into contact with the guidance promotion section. [Effects of the Invention]

[0010] When a wire is guided by the guide, a force acts on it that alters its feeding path as it comes into contact with the guidance acceleration section. This allows the wire, introduced between the pair of side sections, to be guided to the binding section regardless of the angle at which it enters the guide. [Brief explanation of the drawing]

[0011] [Figure 1A] This is an internal diagram, viewed from the other side, showing an example of the overall configuration of the rebar tying machine of this embodiment. [Figure 1B] This is a front cross-sectional view showing an example of the overall configuration of the rebar tying machine of this embodiment. [Figure 2A] This is an overall perspective view showing an example of the guidance guide of this embodiment. [Figure 2B] This is a cross-sectional view of a main part showing an example of the guidance section of this embodiment. [Figure 2C] This is a plan view of a key part showing an example of the guidance section of this embodiment. [Figure 3A] This is a side view showing the main components of the rebar tying machine according to this embodiment. [Figure 3B] This is a top view showing the main components of the rebar tying machine according to this embodiment. [Figure 3C] This is a top cross-sectional view showing the main components of the rebar tying machine of this embodiment. [Figure 4A] This is an explanatory diagram showing the movement of the wire in the guidance system. [Figure 4B] This is an explanatory diagram showing the movement of the wire in the guidance system. [Figure 4C] This is an explanatory diagram showing the movement of the wire in the guidance system. [Modes for carrying out the invention]

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

[0013] <Example of the configuration of the rebar tying machine according to this embodiment> Figure 1A is an internal diagram viewed from the other side, showing an example of the overall configuration of the rebar tying machine of this embodiment, and Figure 1B is a front cross-sectional view showing an example of the overall configuration of the rebar tying machine of this embodiment.

[0014] The reinforcing bar binding machine 1A is configured to be held and used by an operator by hand, and includes a main body portion 10A and a handle portion 11A. Further, the reinforcing bar binding machine 1A feeds a wire W in a forward direction indicated by arrow F, winds the wire W around reinforcing bars S which are objects to be bound, feeds the wire W wound around the reinforcing bars S in a reverse direction indicated by arrow R to wind the wire W around the reinforcing bars S and cut the wire W, then twists the wire W to bind the reinforcing bars S with the wire W.

[0015] To achieve the above-described functions, the reinforcing bar binding machine 1A includes a magazine 2A that accommodates the wire W, a wire feeding portion 3A that feeds the wire W, and a wire guide 4A that guides the wire W fed to the wire feeding portion 3A. Further, the reinforcing bar binding machine 1A includes a curl forming portion 5A that forms a path for winding the wire W fed by the wire feeding portion 3A around the reinforcing bars S, and a cutting portion 6A that cuts the wire W wound around the reinforcing bars S. Furthermore, the reinforcing bar binding machine 1A includes a binding portion 7A that twists the wire W wound around the reinforcing bars S, and a driving portion 8A that drives the binding portion 7A.

[0016] The magazine 2A is an example of an accommodating portion, in which a reel 20, on which a long wire W is unreelably wound, is rotatably and detachably accommodated. As the wire W, any one of a wire formed of a plastically deformable metal wire, a wire formed of a metal wire coated with resin, or a stranded wire is used. For the reel 20, one or a plurality of wires W are wound around a hub portion (not shown), so that one or a plurality of wires W can be pulled out from the reel 20 at the same time.

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

[0018] The wire feeding portion 3A includes a pair of feeding gears 30 that clamp 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 portion 3A, the rotational motion of the feeding motor 31 is transmitted via a transmission mechanism (not shown) to rotate the feeding gears 30.

[0019] As a result, the wire feeding unit 3A feeds the wire W, which is held between the pair of feed gears 30, along the direction in which the wire W extends. In a configuration that feeds multiple wires, for example, two wires W, the two wires W are fed in parallel.

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

[0021] The wire guide 4A is provided at predetermined positions on the upstream and downstream sides of the wire feeding section 3A with respect to the feeding direction that feeds the wire W in the forward direction. In a configuration that feeds two wires W, the wire guide 4A restricts the radial orientation of the two wires W, guiding the two incoming wires W in parallel between the pair of feed gears 30.

[0022] The wire guide 4A has a shape such that the downstream opening, relative to the feeding direction of the wire W being fed in the forward direction, restricts the radial orientation of the wire W. In contrast, the upstream opening, relative to the feeding direction of the wire W being fed in the forward direction, has a larger opening area than the downstream opening.

[0023] The curl-forming section 5A includes a curl guide 50 that gives the wire W, which is fed by the wire feeding section 3A, a guide guide 51 that guides the wire W, which has been given a curl by the curl guide 50, to the binding section 7A. In the rebar binding machine 1A, the path of the wire W, which is fed by the wire feeding section 3A, is restricted by the curl-forming section 5A, so that the trajectory of the wire W becomes a loop Ru as shown by the dashed line in Figure 1A, and the wire W is wrapped around the rebar S.

[0024] Figure 2A is an overall perspective view showing an example of the guide guide of this embodiment, Figure 2B is a side cross-sectional view of an example of the guide guide section of this embodiment, and Figure 2C is a plan view of an example of the guide guide section of this embodiment. Next, the guide guide 51 of this embodiment will be described. The guide guide 51 is provided at a position offset in a direction opposite to one direction in which the reel 20 is offset, relative to the wire feeding path FL defined by the wire guide 4A.

[0025] The guide 51 includes a first guide portion 52 that restricts the axial position of the loop Ru formed by the wire W that has been coiled by the curl guide 50, and a second guide portion 53 and a third guide portion 54 that restrict the radial position of the loop Ru formed by the wire W.

[0026] The first guide section 52 and the second guide section 53 are provided on the side to which the wire W, which has been coiled by the curl guide 50, is introduced relative to the third guide section 54.

[0027] The first guide portion 52 has a side portion 52b on one side, which is the side where the reel 20 is located in one direction of offset. The first guide portion 52 also has a side portion 52a on the other side, which is the side where the reel 20 is located in the opposite direction to the one direction of offset, opposite to the side portion 52b.

[0028] The second guide section 53 has a side section 52b erected on one side and a side section 52a erected on the other side, and includes a bottom section 53a connecting the side sections 52a and 52b.

[0029] The third guide portion 54 is provided with a guide surface 54a that extends radially outward from the loop Ru formed by the wire W, along the feeding direction of the wire W toward the binding portion 7A.

[0030] The guide 51 has a converging passage 55 formed in a space enclosed by a pair of side sections 52a and 52b and a bottom section 53a. The guide 51 also has an open end 55a into which the wire W enters the converging passage 55. The open end 55a is open in a space enclosed by a pair of side sections 52a and 52b and a bottom section 53a.

[0031] In the first guide portion 52, the distance between the side portions 52a and 52b is widest at the open end 55a, and narrows as it moves from the open end 55a toward the guide surface 54a of the third guide portion 54, forming the narrowest portion 55b.

[0032] The guidance guide 51 includes an entry angle regulating unit 56 that changes the entry angle of the wire W entering the convergence passage 55 so that it faces the narrowest part 55b.

[0033] In the rebar tying machine 1A, the reel 20 is positioned offset in one direction. The wire W, which is fed from this offset reel 20 by the wire feeding unit 3A and coiled by the curl guide 50, is directed in the other direction, which is the opposite direction to the one in which the reel 20 is offset.

[0034] Therefore, the wire W entering the convergence passage 55 between the side portions 52a and 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 part 55b of the convergence passage 55. For this purpose, an entry angle restricting portion 56 is provided on the side portion 52b facing the side portion 52a.

[0035] The entry angle restricting section 56 is configured such that the area near the middle of the entry direction of the wire W on the side surface 52b is convex in the direction of the side surface 52b.

[0036] The guide 51 includes a guide-promoting section 57a ​​that contacts the wire W from the radially outside of the loop Ru formed by the wire W that has been coiled by the curl guide 50, and applies a force to the wire W that changes the feeding path of the wire W. The guide 51 also includes a guide recess 57b between the guide-promoting section 57a ​​and the third guide section 54 into which the wire W, which expands radially outward from the loop Ru, is inserted.

[0037] The guidance and promotion section 57a ​​is constructed by providing a protrusion on the bottom surface 53a of the second guide section 53, which is composed of a flat surface, that projects in the direction of the curl guide 50. The guidance and promotion section 57a ​​is provided from the center of the bottom surface 53a along the wire W feeding direction toward the opening end 55a, and in this example, it is provided along the opening end 55a over its entire width.

[0038] The guidance and promotion section 57a ​​is constructed by integrally attaching a convex member having a predetermined shape, such as a triangular cross-section, to the bottom surface 53a, or by attaching a separate component to the bottom surface 53a. Alternatively, the guidance and promotion section 57a ​​may be constructed as a rotating member, such as a roller, that has an axis extending along the open end 55a and into which the wire W can rotatably make contact. The height at which the guidance and promotion section 57a ​​protrudes from the bottom surface 53a is such that the tip of the wire W, which has been given a curl by the curl guide 50 and is guided by the guidance guide 51, does not abut against it.

[0039] The guide recess 57b is provided downstream of the guide promotion section 57a ​​with respect to the feeding direction of the wire W being fed in the forward direction, and is composed of the bottom surface 53a of the second guide section 53 which is concave toward the radially outward direction of the loop Ru formed by the wire W with respect to the guide promotion section 57a.

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

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

[0042] The binding section 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 drive section 8A includes a motor 80 and a reduction gear 81 that performs reduction and torque amplification. The binding section 7A and the drive section 8A are connected via the reduction gear 81 between the rotating shaft 72 and the motor 80, and the rotating shaft 72 is driven by the motor 80 via the reduction gear 81.

[0043] The rebar tying machine 1A has the curl guide 50 and guide guide 51 of the curl forming section 5A described above provided at the front end of the main body section 10A, which is one side along the axial direction of the rotating shaft 72. The rebar tying machine 1A also includes a feed restricting section 90 that abuts the tip of the wire W in the feed path of the wire W, which is guided by the curl forming section 5A and locked by the wire locking body 70. Furthermore, the rebar tying machine 1A has a stopper section 91 against which the rebar S abuts, provided at the front end of the main body section 10A, between the curl guide 50 and the guide guide 51.

[0044] The rebar tying machine 1A has a handle section 11A that extends downward from the main body section 10A. A battery 15A is detachably attached to the lower part of the handle section 11A. Furthermore, the rebar tying machine 1A has a magazine 2A located in front of the handle section 11A. The rebar tying machine 1A houses the wire feeding section 3A, cutting section 6A, tying section 7A, and the drive section 8A that drives the tying section 7A, etc., as described above, in the main body section 10A.

[0045] The rebar tying machine 1A has a trigger 12A on the front of the handle 11A and a switch 13A inside the handle 11A. 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.

[0046] Figure 3A is a side view showing the main components of the rebar tying machine of this embodiment, Figure 3B is a top view showing the main components of the rebar tying machine of this embodiment, and Figure 3C is a top cross-sectional view showing the main components of the rebar tying machine of this embodiment. Next, the details of the tying unit 7A and the connection structure between the tying unit 7A and the drive unit 8A will be described with reference to each figure.

[0047] The binding section 7A includes a wire locking body 70 into which the wire W is locked, and a rotating shaft 72 that operates the wire locking body 70. The binding section 7A and the drive section 8A are connected by a reduction gear 81 between the rotating shaft 72 and the motor 80, and the rotating shaft 72 is driven by the motor 80 via the reduction gear 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 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 rotational movement of the rotating shaft 72.

[0049] In the fastening section 7A, the side on which the center hook 70C, the first side hook 70L, and the second side hook 70R are provided is the front side, and the side on which the rotating shaft 72 is connected to the reduction gear 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, via a configuration that allows it to rotate relative to the rotating shaft 72 and move integrally with the rotating shaft 72 in the axial direction.

[0051] The first side hook 70L has a front end, which is one end along the axial direction of the rotation axis 72, positioned on one side relative to the center hook 70C. The other end of the first side hook 70L, which is the rear end, is rotatably supported by the center hook 70C on axis 71b, along the axial direction of the rotation axis 72.

[0052] The second side hook 70R has a front end, which is one end along the axial direction of the rotation axis 72, positioned on the other side relative to the center hook 70C. The rear end, which is the other end along the axial direction of the rotation axis 72, is rotatably supported by the center hook 70C on axis 71b.

[0053] As a result, the wire locking body 70 rotates with the axis 71b as the pivot point, causing the tip of the first side hook 70L to open and close in a direction away from the center hook 70C. Also, the tip of the second side hook 70R opens and closes in a direction away from the center hook 70C.

[0054] The rotating shaft 72 is connected to the reduction gear 81 at its rear end via a connecting portion 72b, which is configured to rotate integrally with the reduction gear 81 and to be movable axially relative to the reduction gear 81. The connecting portion 72b includes a spring 72c that biases the rotating shaft 72 towards the reduction gear 81, thereby restricting the position of the rotating shaft 72 along the axial direction. As a result, the rotating shaft 72 is configured to be movable forward, away from the reduction gear 81, while being pushed backward by the spring 72c. Therefore, when a force is applied that moves the wire locking body 70 forward along the axial direction, the rotating shaft 72 is able to move forward while being pushed backward by the spring 72c.

[0055] The sleeve 71 is shaped so that a predetermined length of the sleeve, extending from the front end indicated by arrow A1 along the axial direction of the rotating shaft 72, is divided radially into two sections, into which the first side hook 70L and the second side hook 70R can be opened and closed. The sleeve 71 is cylindrical and covers the circumference of the rotating shaft 72, and has a protrusion (not shown) that projects from the inner circumferential surface of the cylindrical space into which the rotating shaft 72 is inserted. This protrusion fits into a groove of the feed screw 72a formed along the axial direction on the outer circumference of the rotating shaft 72. When the rotating shaft 72 rotates, the sleeve 71 moves in the forward and backward direction, which is along the axial direction of the rotating shaft 72, in accordance with the rotation direction of the rotating shaft 72, due to the action of the protrusion (not shown) and the feed screw 72a of the rotating shaft 72. The sleeve 71 also rotates integrally with the rotating shaft 72.

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

[0057] 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 extends along the direction of movement of the sleeve 71 and has a shape that converts the linear movement of the opening / closing pin 71a, which moves in conjunction with the sleeve 71, into an opening / closing operation by rotation of the first side hook 70L and the second side hook 70R with the axis 71b as the pivot point.

[0058] As the sleeve 71 moves in the rearward direction indicated by arrow A2, the wire locking body 70 causes the first side hook 70L and the second side hook 70R to move away from the center hook 70C in a rotational motion with the axis 71b as the pivot point, due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73.

[0059] 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 wire W 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 relative to the center hook 70C, the wire W fed by the wire feeding section 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 section 5A. The wire W, which has been given a curl in the curl forming section 5A and guided to the binding section 7A, passes between the center hook 70C and the second side hook 70R.

[0061] As the wire locking body 70 moves forward in the direction indicated by arrow A1, the first side hook 70L and the second side hook 70R move toward the center hook 70C in a rotational motion with the axis 71b as the pivot point, due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73. As a result, the first side hook 70L and the second side hook 70R close toward the center hook 70C.

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

[0063] The wire locking body 70 includes a bending portion 71c1 that shapes the wire W into a predetermined shape by pushing and bending one end of the wire W, the tip end, in a predetermined direction. The wire locking body 70 also includes a bending portion 71c2 that shapes the wire W into a predetermined shape by pushing and bending the other end of the wire W, the terminal end, which has been cut at the cutting portion 6A, in a predetermined direction.

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

[0065] After the wire W is cut at the cutting section 6A, the sleeve 71 moves further forward as indicated by arrow A1, pressing the tip end of the wire W, which is locked by the center hook 70C and the second side hook 70R, with the bending section 71c1, bending it toward the reinforcing bar S. The sleeve 71 is also locked by the center hook 70C and the first side hook 70L, and presses the end end of the wire W, which was cut at the cutting section 6A, with the bending section 71c2, bending it toward the reinforcing bar S.

[0066] The binding section 7A includes a rotation restricting section 74 that restricts the rotation of the wire locking body 70 and sleeve 71, which are linked to the rotational movement of the rotating shaft 72. The rotation restricting section 74 has a rotation restricting vane 74a on the sleeve 71 and a rotation restricting claw 74b on the main body 10A.

[0067] The rotation restricting vane 74a is constructed by providing a plurality of protrusions that project radially from the outer circumference of the sleeve 71 at predetermined intervals in the circumferential direction of the sleeve 71. The rotation restricting vane 74a is fixed to the sleeve 71 and moves and rotates integrally with the sleeve 71.

[0068] In the rotation restricting section 74, the wire W is secured by the wire locking body 70, the wire W is wrapped around the reinforcing bar S, then cut by the cutting section 6A, and further, the wire W is bent and shaped by the bending sections 71c1 and 71c2 of the sleeve 71. In this operating range, the rotation restricting blade 74a is locked to the rotation restricting claw 74b. When the rotation restricting blade 74a is locked to the rotation restricting claw 74b, the rotation of the sleeve 71, which is linked to the rotation of the rotating shaft 72, is restricted, and the sleeve 71 moves in the front-back direction as the rotating shaft 72 rotates.

[0069] Furthermore, in the operating range where the wire W locked by the wire locking body 70 is twisted, the rotation restricting section 74 releases its engagement with the rotation restricting claw 74b of the rotation restricting vane 74a. When the rotation restricting vane 74a releases its engagement with the rotation restricting claw 74b, the sleeve 71 rotates in conjunction with the rotation of the rotating shaft 72. In conjunction with the rotation of the sleeve 71, the wire locking body 70's center hook 70C, first side hook 70L, and second side hook 70R rotate, locking the wire W. In the operating range of the sleeve 71 and wire locking body 70 along the axial direction of the rotating shaft 72, the operating range where the wire W is locked by the wire locking body 70 is referred to as the first operating range. In addition, the operating range in the first operating range where the wire W locked by the wire locking body 70 is twisted is referred to as the second operating range.

[0070] The fastening section 7A is provided with a movable member 83 that is movable in conjunction with the sleeve 71. The movable member 83 is rotatably attached to the sleeve 71 and moves in the front-rear direction in conjunction with the sleeve 71, but not in conjunction with the rotation of the sleeve 71.

[0071] The movable member 83 is equipped with an engaging portion 83a that engages with the transmission mechanism 62. When the movable member 83 moves in the forward and backward direction in conjunction with the sleeve 71, the transmission mechanism 62 transmits the movement of the movable member 83 to the movable blade portion 61, causing the movable blade portion 61 to rotate. As a result, the movable blade portion 61 rotates in a predetermined direction as the sleeve 71 moves forward, and the wire W is cut.

[0072] The binding section 7A includes a tension-applying spring 92 that allows binding to be performed while tension is applied to the wire W. The tension-applying spring 92 is provided on the outside of the sleeve 71 and biases the sleeve 71 and the wire locking body 70 toward the abutment section 91 along the axial direction of the rotation shaft 72. The tension-applying spring 92 is, for example, a coil spring that expands and contracts in the axial direction and is fitted around the outer circumference of the sleeve 71 between the rotation restricting vane 74a and the support frame 76d that supports the sleeve 71 so that it can rotate and slide in the axial direction.

[0073] The tension-applying spring 92 is compressed between the support frame 76d and the rotation-restricting vane 74a depending on the position of the sleeve 71 along the axial direction of the rotation axis 72, biasing the sleeve 71 backward in the direction away from the abutment portion 91 along the axial direction of the rotation axis 72. As a result, the tension-applying spring 92 biases the wire locking body 70 equipped with the sleeve 71 in a direction that maintains the tension applied to the wire W during the operation of feeding the wire W in the reverse direction and wrapping it around the reinforcing bar S.

[0074] As a result, when the sleeve 71 moves forward and is compressed, the tension-applying spring 92 applies tension to the wire W, which is wrapped around the reinforcing bar S and then cut at the cutting section 6A, with a force greater than the force acting in the direction that would loosen the wire W wrapped around the reinforcing bar S. Therefore, it becomes possible to tie the wires while tension is applied to the wire W after it has been cut.

[0075] Furthermore, the wire locking body 70 is configured to be movable forward while the sleeve 71 is subjected to a force pushing it backward by the tension-applying spring 92, and the rotating shaft 72 is subjected to a force pushing it backward by the spring 72c.

[0076] <Example of operation of the rebar tying machine of this embodiment> Next, referring to the figures, the operation of tying reinforcing bars S with wire W using the reinforcing bar tying machine 1A of this 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 section 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 in the wire feed section 3A.

[0078] In a configuration where multiple wires, for example two wires W, are used to tie together the reinforcing bars S, the wire guide 4A ensures that the two wires W are fed in parallel along the axial direction of the loop Ru formed by the wires W.

[0079] The wire W, fed in the forward 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 section 5A. As the wire W passes through the curl guide 50, it acquires a curl that causes it to wrap around the reinforcing bar S.

[0080] The wire W, which has been given a coiled shape by the curl guide 50, is guided by the guide guide 51. Figures 4A, 4B, and 4C are explanatory diagrams showing the movement of the wire in the guide guide, and next, the effect of guiding the wire W with the guide guide 51 will be explained.

[0081] The wire W, which has been coiled in the curl guide 50 and guided to the guide guide 51, passes through the guide guide 51 in a path away from the bottom surface 53a of the second guide section 53, as shown in Figure 4A. Also, the wire W that has been coiled in the curl guide 50 is directed in the opposite direction to the direction in which the reel 20 is offset. For this reason, the wire W that enters between the side sections 52a and 52b of the first guide section 52 in the guide guide 51 first enters towards the side section 52a.

[0082] In the guide 51, when the tip WS of the wire W entering toward the side portion 52a comes into contact with the side portion 52a, the resistance to the wire tip WS being guided along the side portion 52a increases. As the amount of movement of the wire tip WS along the side portion 52a decreases due to frictional resistance, and the amount of wire W being fed in the forward direction becomes relatively larger, the diameter of the loop Ru formed by the wire W being coiled in the curl guide 50 gradually increases.

[0083] As the wire W guided by the guide 51 is fed in the forward direction, the diameter of the loop Ru gradually increases, allowing it to enter the guide recess 57b until it reaches a position where it contacts the bottom surface 53a of the second guide portion 53.

[0084] Therefore, as shown in Figure 4B, the wire W, guided by the guide guide 51 and with its tip WS in contact with the side portion 52a, gradually increases the diameter of the loop Ru and enters the guide recess 57b, causing it to come into contact with the guide acceleration portion 57a ​​on the upstream side of the guide recess 57b with respect to the feeding direction of the wire W.

[0085] As the wire W guided by the guidance guide 51 comes into contact with the guidance acceleration section 57a, a force acts on the wire W that changes the feeding path of the wire W as it enters the side section 52a. As a result, the wire W guided by the guidance guide 51 is further fed in the forward direction, so that the tip WS is guided away from the side section 52a, and as shown in Figure 4C, it can be introduced into the narrowest section 55b toward the third guide section 54b.

[0086] Furthermore, when the wire W, guided by the guidance guide 51, has its tip WS in contact with the side portion 52a, contacting the entry angle regulating section 56 before it contacts the guidance acceleration section 57a ​​also acts on the wire W, changing the feeding path of the wire W as it enters towards the side portion 52a. As a result, the wire W guided by the guidance guide 51 is further fed in the forward direction, guiding its tip WS away from the side portion 52a, and allowing it to be introduced into the narrowest section 55b toward the third guide section 54b.

[0087] The wire W, which has been coiled by the curl guide 50, is guided by the guide guide 51 and further fed in the forward direction by the wire feeding section 3A, so that it is guided by the guide guide 51 between the center hook 70C and the second side hook 70R. The wire W is then fed until its tip abuts against the feed restricting section 90. When the tip of the wire W reaches the position where it abuts against the feed restricting section 90, the drive of the feed 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 W is locked by the wire locking body 70, the rotation restricting vane 74a is locked to the rotation restricting claw 74b, thereby restricting the rotation of the sleeve 71 which is linked to the rotation of the rotating shaft 72. As a result, the rotation of the motor 80 is converted into linear motion, and the sleeve 71 moves in the forward direction, as indicated by arrow A1.

[0089] As 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 toward the center hook 70C in a rotational motion with the axis 71b as the pivot point. When the first side hook 70L closes toward the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a manner that allows it to move between the first side hook 70L and the center hook 70C.

[0090] Furthermore, the second side hook 70R moves toward the center hook 70C by a rotational motion with the axis 71b as the pivot point. When the second side hook 70R closes toward the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a manner that prevents it from slipping out from between the second side hook 70R and the center hook 70C.

[0091] After the sleeve 71 is advanced to a position where the wire W is locked by the closing 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 direction.

[0092] As a result, the pair of feed gears 30 reverse direction, and the wire W, which is held between the pair of feed gears 30, is fed in the opposite direction indicated by arrow R. Since the tip of the wire W is locked in a manner that prevents it from coming out between the second side hook 70R and the center hook 70C, the wire W is wrapped around the reinforcing bar S by the motion of feeding the wire W in the reverse direction.

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

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

[0095] When the wire W is cut, the tension on the wire W is released, and the sleeve 71 attempts to move forward. As the sleeve 71 moves forward, the force pulling the wire W, which is locked in place by the wire locking body 70, backward decreases, and the wire W wrapped around the reinforcing bar S loosens before it can twist.

[0096] In contrast, in this embodiment, when the rebar tying machine 1A moves the sleeve 71 and wire locking body 70 forward to cut the wire W, the rotation restricting vane 74a contacts the tension-applying spring 92, and the tension-applying spring 92 is compressed between the support frame 76d and the rotation restricting vane 74a, causing the sleeve 71 and wire locking body 70 to be biased backward by the tension-applying spring 92.

[0097] This suppresses the forward movement of the sleeve 71, thereby preventing a decrease in the force pulling the wire W, which is locked by the wire locking body 70, backward, and preventing the wire W wrapped around the reinforcing bar S from loosening before it twists.

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

[0099] Furthermore, the wire W, which is held between the first wire holding portion 71c2a and the second wire holding portion 71c2b that constitute the bent portion 71c2 of the sleeve 71 and the anti-slip portion 70La of the first side hook 70L, is further pressed toward the reinforcing bar S by the bent portion 71c2, and bent toward the reinforcing bar S with the locking position as a fulcrum. As the sleeve 71 moves further forward, the wire W, which is locked between the first side hook 70L and the center hook, is held in a state where it is sandwiched between the bent portion 71c2.

[0100] After the tip and end of the wire W are bent toward the reinforcing bar S, the motor 80 is further driven in the forward rotation direction, causing the sleeve 71 to move further forward. When the sleeve 71 moves to a predetermined position and reaches the operating range in which the wire W, which is locked by the wire locking body 70, is twisted, the locking of the rotation restricting vane 74a with the rotation restricting claw 74b is released.

[0101] As a result, the motor 80 is driven further in the forward rotation direction, causing the sleeve 71 to rotate in conjunction with the rotating shaft 72, and the wire W, which is locked in the wire locking body 70, to twist.

[0102] In the second operating range where the sleeve 71 rotates and twists the wire W, the wire W, which is locked by the wire locking body 70, is twisted, and a force is applied to the wire locking body 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 position where it can rotate, the tension-applying spring 92 is further compressed, and the sleeve 71 receives a force that pushes it backward from the tension-applying spring 92.

[0103] As a result, when a force is applied to the wire locking body 70 that moves it forward along the axial direction, the sleeve 71 receives a force that pushes it backward by the tension-applying spring 92, and the rotating shaft 72 receives a force that pushes it backward by the spring 72c, while moving forward and twisting the wire W as it moves forward.

[0104] Therefore, the portion of the wire W locked by the wire locking body 70 is pulled backward, tension is applied tangentially to the reinforcing bar S, and the wire is pulled to be in close contact with the reinforcing bar S. In the second range of motion where the sleeve 71 rotates and twists the wire W, the wire locking body 70 rotates further in conjunction with the rotating shaft 72, causing the wire locking body 70 and the rotating shaft 72 to move forward, which is the direction in which the gap between the twisted portion of the wire W and the reinforcing bar S becomes smaller, thereby twisting the wire W further.

[0105] Therefore, as the wire W moves forward and is twisted while the wire locking body 70 and the rotating shaft 72 are subjected to a force pushing backward by the tension-applying springs 92 and 72c, the gap between the twisted portion of the wire W and the reinforcing bar S becomes smaller, and the wire W adheres closely to the reinforcing bar S in a manner that follows the shape of the reinforcing bar S. This eliminates the slack in the wire W before twisting, and allows the wire W to be tied in a state of close contact with the reinforcing bar S.

[0106] When the load on the motor 80 is detected to be at its maximum due to the twisting of the wire W, the forward rotation of the motor 80 is stopped. Next, when the motor 80 is driven in the reverse direction, the rotating shaft 72 rotates in the reverse direction, and as the sleeve 71 rotates in the reverse direction following the rotation of the rotating shaft 72, the rotation restricting vane 74a is locked into the rotation restricting claw 74b, thereby restricting 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 rear direction.

[0107] As the sleeve 71 moves backward, the bent portions 71c1 and 71c2 separate from the wire W, and the wire W is no longer held by the bent portions 71c1 and 71c2. Also, as the sleeve 71 moves backward, 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 in a rotational motion with the shaft 71b as the pivot point. Similarly, the second side hook 70R moves away from the center hook 70C in a rotational motion with the shaft 71b as the pivot point. As a result, the wire W is released from the wire locking body 70. [Explanation of symbols]

[0108] 1A... Rebar tying machine, 10A... Main body, 11A... Handle, 2A... Magazine, 20... Reel, 3A... Wire feeding section, 30... Feed gear, 31... Feed motor, 4A... Wire guide, 5A... Curl forming section, 50... Curl guide, 51... Guiding guide, 52... First guide section, 52a, 52b... Side section, 53... • Second guide section, 53a...Bottom section, 54...Third guide section, 54a...Guide surface, 55a...Open end, 55b...Narrowest section, 56...Entry angle regulating section, 57a...Guidance promotion section, 57b...Guidance recess, 6A...Cutting section, 7A...Binding section, 70...Wire locking body, 72...Rotating shaft, 8A...Drive section, 80...Motor, W...Wire

Claims

1. A wire feeding section that feeds the wire to be wrapped around the bundled items, A curl guide that gives a curl to the wire being fed by the wire feeding section, A guide for guiding the wire that has been given a coiled shape by the aforementioned curl guide, A binding portion that twists the wire guided by the aforementioned guide and Equipped with, The aforementioned guidance system is The curl guide restricts the axial position of the loop formed by the wire that has been given a curl, and a pair of opposing side portions along the axial direction of the loop, A bottom portion that connects the pair of aforementioned side portions and restricts the radial position of the loop, The bottom portion is provided on the open end side into which the wire enters, and the guide-promoting portion protrudes in the direction toward the curl guide from the bottom portion. It has, The induction promoting section is provided extending from one side surface to the other side surface of the pair of side surfaces. The height of the side portion in the direction from the bottom portion toward the curl guide is greater than the height of the guide promotion portion that protrudes from the bottom portion. Binding machine.

2. The aforementioned guide restricts 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 aforementioned side portion, in the range from the guidance promotion portion to the guide surface and in a direction parallel to the bottom portion, has a height in the direction from the bottom portion toward the curl guide that is continuously higher than the guidance promotion portion in the direction parallel to the bottom portion. The binding machine according to claim 1.

3. The guidance promotion section is provided at the open end of the bottom surface. The binding machine according to claim 1.

4. The induction-promoting portion is integrally formed with the bottom surface portion. The binding machine according to claim 1.

5. The induction promotion section is formed by attaching an independent component to the bottom surface. The binding machine according to claim 1.

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