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 wire feed portion 3A for feeding a wire W that is wound around reinforcements S, a binding portion 7A for twisting the wire W wound around the reinforcements S, a curl guide 50 for giving winding curl to the wire W fed by the wire feed portion 3A, and an introducing guide 51 for introducing the wire W to which winding curl is given at the curl guide 50 to the binding portion 7A. The introducing guide 51 comprises an introducing promotion portion 57a that contacts the wire W from an outside of a radial direction of a loop Ru formed by the wire W to which winding curl is given at the curl guide 50 and that gives a force changing a feed path of the wire W to the wire W, and an introducing recess portion 57b provided at a downstream side of the introducing promotion portion 57a relative to a feed direction of the wire W and entering the wire W that is expanded toward an outside of the radial direction of the loop Ru.SELECTED DRAWING: Figure 1A

Description

[Technical field]

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

[0002] 2. Description of the Related Art Conventionally, there has been proposed a binding machine known as a reinforcing bar binding machine, which wraps a wire around two or more reinforcing bars and twists the wire wrapped around the reinforcing bars to bind the two or more reinforcing bars with the wire.

[0003] The bundling machine winds the wire, which is fed by the driving force of a motor, around the rebar by passing it through a guide called a curl guide, etc., which gives the wire a curl. This curled wire is guided by a guide called an induction guide, etc., to a bundling section where the wire is twisted, and the wire wound around the rebar is twisted at the bundling section, thereby bundling the rebar with the wire.

[0004] The guide that guides the curled wire to the bundling section has a shape in which the distance between a pair of walls gradually narrows from the tip side where the wire enters toward the rear end side (see, for example, Patent Document 1). As a result, the wire that enters the guide that guides the curled wire to the bundling section is guided along the pair of walls with the distance gradually narrowing. [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] If the wire enters the guide that leads it to the bundling section at a large angle, when the tip of the wire comes into contact with one of the pair of walls, the angle at which the wire contacts the wall becomes large. If the contact angle of the wire with the wall becomes large, the resistance due to friction when the wire slides along the wall becomes large, and the wire cannot be fed.

[0007] The present invention has been made to solve such problems, and has an object to provide a binding machine that can reliably feed a wire regardless of the wire entry angle. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides a wire feed section which feeds a wire to be wound around a bundle, a bundling section which twists the wire wound around the bundle, a curl guide which gives a curl to the wire fed by the wire feed section, and a guide guide which guides the wire curled by the curl guide to the bundling section, the guide guide having a guide promotion section which contacts the wire from the radial outside of a loop formed by the wire curled by the curl guide and applies a force to the wire to change the feed path of the wire, and a guide recess which is provided downstream of the guide promotion section in the wire feed direction and into which the wire which spreads out toward the radial outside of the loop is received. a first guide section having a pair of side sections that regulates the axial position of a loop formed by the wire curled by the curl guide; a second guide section having a bottom section that connects the pair of side sections and regulates the radial position of the loop; and a focusing passage that is configured as a space surrounded by the pair of side sections and the bottom section, and in which the distance between the pair of side sections narrows along the wire entry direction from an opening end through which the wire curled by the curl guide enters. Equipped with The induction promotion section is provided on the open end side from the center of the bottom surface section along the wire feed direction and protrudes from the bottom surface section toward the curl guide direction, and the focusing passage is provided downstream of the induction promotion section along the wire feed direction. It is a binding machine.

[0009] In the present invention, the wire guided by the induction guide expands in a direction in which the loop diameter gradually increases, and enters the induction recess, thereby contacting the induction promotion portion upstream of the induction recess with respect to the wire feed direction. Effect of the Invention

[0010] When the wire guided by the guide comes into contact with the guide promoting section, a force that changes the wire feed path acts on the wire, allowing the wire to be guided to the bundling section regardless of the angle at which the wire enters the guide. [Brief description of the drawings]

[0011] [Figure 1A] 1 is an internal configuration diagram showing an example of the overall configuration of the reinforcing bar binding machine of the present embodiment, as viewed from the other side. FIG. [Figure 1B] 1 is a front cross-sectional view showing an example of the overall configuration of a reinforcing bar binding machine according to an embodiment of the present invention. [Figure 2A] FIG. 2 is an overall perspective view showing an example of an induction guide according to the present embodiment. [Figure 2B] 4 is a side cross-sectional view of a main portion showing an example of an induction guide portion of the present embodiment. FIG. [Figure 2C] 4 is a plan view of a main portion showing an example of an induction guide portion according to the present embodiment. FIG. [Figure 3A] FIG. 2 is a side view showing the main configuration of the reinforcing bar binding machine of the present embodiment. [Figure 3B] FIG. 2 is a top view showing the main configuration of the reinforcing bar binding machine of the present embodiment. [Figure 3C] FIG. 2 is a top cross-sectional view showing the main configuration of the reinforcing bar binding machine of the present embodiment. [Figure 4A] FIG. 13 is an explanatory diagram showing the movement of a wire in a guidance guide. [Figure 4B] FIG. 13 is an explanatory diagram showing the movement of a wire in a guidance guide. [Figure 4C] FIG. 13 is an explanatory diagram showing the movement of a wire in a guidance guide. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0013] <Configuration example of the reinforcing bar binding machine according to this embodiment> FIG. 1A is an internal configuration diagram seen from another side showing an example of the overall configuration of the reinforcing bar binding machine of the present embodiment, and FIG. 1B is a front cross-sectional view showing an example of the overall configuration of the reinforcing bar binding machine of the present embodiment.

[0014] The reinforcing bar binding machine 1A is configured to be held by an operator and includes a main body 10A and a handle 11A. The reinforcing bar binding machine 1A feeds the wire W in the forward direction indicated by the arrow F, winding it around the reinforcing bar S to be bound, and then feeds the wire W wound around the reinforcing bar S in the reverse direction indicated by the arrow R to wind it around the reinforcing bar S and cut it. Then, the wire W is twisted and the reinforcing bar S is bound with the wire W.

[0015] To achieve the above-mentioned functions, the reinforcing bar binding machine 1A is equipped with a magazine 2A that stores the wire W, a wire feeding unit 3A that feeds the wire W, and a wire guide 4A that guides the wire W fed to the wire feeding unit 3A. The reinforcing bar binding machine 1A also is equipped with a curl forming unit 5A that forms a path for winding the wire W fed by the wire feeding unit 3A around the reinforcing bar S, and a cutting unit 6A that cuts the wire W wound around the reinforcing bar S. The reinforcing bar binding machine 1A further includes a binding unit 7A that twists the wire W wound around the reinforcing bar S, and a drive unit 8A that drives the binding unit 7A.

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

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

[0018] The wire feed unit 3A includes a pair of feed gears 30 that clamp and feed one wire W or multiple wires W arranged in parallel, and a feed motor 31 that drives the feed gear 30. In the wire feed unit 3A, the rotational operation of the feed motor 31 is transmitted via a transmission mechanism (not shown) to rotate the feed gear 30.

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

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

[0021] The wire guides 4A are provided at predetermined positions upstream and downstream of the wire feeding section 3A with respect to the feeding direction in which the wire W is fed in the forward direction. In a configuration in which two wires W are fed, the wire guides 4A regulate the radial directions of the two wires W, align the two entering wires W in parallel, and guide them between a pair of feed gears 30.

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

[0023] The curl forming unit 5A includes a curl guide 50 that curls the wire W fed by the wire feeding unit 3A, and an induction guide 51 that guides the wire W curled by the curl guide 50 to the bundling unit 7A. In the rebar bundling machine 1A, the path of the wire W fed by the wire feeding unit 3A is regulated by the curl forming unit 5A, so that the trajectory of the wire W becomes a loop Ru as shown by the two-dot chain line in FIG. 1A, and the wire W is wound around the rebar S.

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

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

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

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

[0028] The second guide portion 53 has a side surface portion 52b standing on one side, a side surface portion 52a standing on the other side, and a bottom surface portion 53a connecting the side surface portion 52a and the side surface portion 52b.

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

[0030] In the induction guide 51, a focusing passage 55 is formed in a space surrounded by a pair of side surfaces 52a, 52b and a bottom surface 53a. In addition, the induction guide 51 is formed with an open end 55a through which the wire W enters the focusing passage 55. The open end 55a opens in the space surrounded by the pair of side surfaces 52a, 52b and the bottom surface 53a.

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

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

[0033] In the reinforcing bar binding machine 1A, the reel 20 is disposed offset in one direction. The wire W, which is fed from the reel 20 offset in this one direction by the wire feed unit 3A and curled by the curl guide 50, heads in another direction opposite to the one direction in which the reel 20 is offset.

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

[0035] The approach angle restriction portion 56 is configured in a shape that is convex toward the side surface portion 52b, near the middle of the side surface portion 52b in the approach direction of the wire W.

[0036] The induction guide 51 includes an induction promotion portion 57a ​​that contacts the wire W from the radial outside of the loop Ru formed by the wire W curled by the curl guide 50, and applies to the wire W a force that changes the feed path of the wire W. The induction guide 51 also includes an induction recess 57b between the induction promotion portion 57a ​​and the third guide portion 54, into which the wire W that spreads outward in the radial direction of the loop Ru enters.

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

[0038] The induction promotion part 57a is configured by attaching a convex member having a predetermined shape, such as a triangular cross section, integral with the bottom surface part 53a, or by attaching a part independent of the bottom surface part 53a to the bottom surface part 53a. The induction promotion part 57a may be configured by a rotating member, such as a roller, having an axis extending along the open end 55a and capable of rotating when the wire W comes into contact with it. The height of the induction promotion part 57a protruding from the bottom surface part 53a is a height at which the tip of the wire W, which has been curled by the curl guide 50 and is guided by the induction guide 51, does not abut against the tip.

[0039] The induction recess 57b is provided downstream of the induction promotion section 57a ​​in the feed direction of the wire W fed in the forward direction, and is formed by the bottom surface section 53a of the second guide section 53 which is concave toward the radial outside of the loop Ru formed by the wire W relative to the induction promotion section 57a.

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

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

[0042] The bundling unit 7A includes a wire locking body 70 to which the wire W is locked, and a rotating shaft 72 that operates the wire locking body 70. The driving unit 8A includes a motor 80 and a reducer 81 that reduces speed and amplifies torque. The bundling unit 7A and the driving unit 8A are connected by the rotating shaft 72 and the motor 80 via the reducer 81, and the rotating shaft 72 is driven by the motor 80 via the reducer 81.

[0043] In the reinforcing bar binding machine 1A, the curl guide 50 and the induction guide 51 of the curl forming unit 5A described above are provided at the front end of the main body 10A, which is one side along the axial direction of the rotation shaft 72. The reinforcing bar binding machine 1A also includes a feed regulating unit 90 against which the tip of the wire W abuts in the feed path of the wire W that is guided by the curl forming unit 5A and locked by the wire locking body 70. Furthermore, in the reinforcing bar binding machine 1A, an abutting unit 91 against which the reinforcing bar S abuts is provided between the curl guide 50 and the induction guide 51 at the front end of the main body 10A.

[0044] In the reinforcing bar binding machine 1A, a handle portion 11A extends downward from a main body portion 10A. A battery 15A is detachably attached to the lower portion of the handle portion 11A. Furthermore, in the reinforcing bar binding machine 1A, a magazine 2A is provided in front of the handle portion 11A. In the reinforcing bar binding machine 1A, the above-mentioned wire feeding portion 3A, cutting portion 6A, binding portion 7A, drive portion 8A that drives the binding portion 7A, etc. are stored in the main body portion 10A.

[0045] The rebar binding machine 1A has a trigger 12A provided on the front side of a handle portion 11A, and a switch 13A provided inside the handle portion 11A. In the rebar binding 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 operating the trigger 12A.

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

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

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

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

[0050] The center hook 70C is connected to one end, that is, the front end, of the rotating shaft 72 via a structure that is rotatable relative to the rotating shaft 72 and is movable integrally with the rotating shaft 72 in the axial direction.

[0051] The first side hook 70L has a tip end, which is one end along the axial direction of the rotating shaft 72, located on one side of the center hook 70C. The first side hook 70L has a rear end, which is the other end along the axial direction of the rotating shaft 72, rotatably supported by the center hook 70C via a shaft 71b.

[0052] The second side hook 70R has a tip end, which is one end along the axial direction of the rotating shaft 72, located on the other side of the center hook 70C. Also, the second side hook 70R has a rear end, which is the other end along the axial direction of the rotating shaft 72, rotatably supported by the center hook 70C via the shaft 71b.

[0053] As a result, the wire locking body 70 rotates about the shaft 71b, opening and closing the tip of the first side hook 70L in the direction of approaching and separating from the center hook 70C, and the tip of the second side hook 70R in the direction of approaching and separating from the center hook 70C.

[0054] The rotating shaft 72 is connected at its rear end, which is the other end, to the reducer 81 via a connecting portion 72b configured to be rotatable integrally with the reducer 81 and movable axially relative to the reducer 81. The connecting portion 72b includes a spring 72c that biases the rotating shaft 72 rearward, which is a direction approaching the reducer 81, and regulates the position of the rotating shaft 72 along the axial direction. As a result, the rotating shaft 72 is configured to be movable forward, which is a direction away from the reducer 81, while receiving a force pushing it backward by the spring 72c. Therefore, when a force is applied to move the wire locking body 70 forward along the axial direction, the rotating shaft 72 is movable forward while receiving a force pushing it backward by the spring 72c.

[0055] The sleeve 71 is shaped such that a range of a predetermined length along the axial direction of the rotating shaft 72 from the front end indicated by the arrow A1 is divided into two in the radial direction, and the first side hook 70L and the second side hook 70R are shaped to be openable and closable. The sleeve 71 is cylindrical and covers the circumference of the rotating shaft 72, and has a convex portion (not shown) protruding from the inner circumferential surface of the cylindrical space into which the rotating shaft 72 is inserted, and this convex portion enters a groove portion of a feed screw 72a formed along the axial direction on the outer periphery of the rotating shaft 72. When the rotating shaft 72 rotates, the sleeve 71 moves in the front-rear direction, which is the direction along the axial direction of the rotating shaft 72, according to the rotation direction of the rotating shaft 72, due to the action of the convex portion (not shown) and the feed screw 72a of the rotating shaft 72. The sleeve 71 rotates integrally with the rotating shaft 72.

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

[0057] The opening / closing pin 71a is inserted into an opening / closing guide hole 73 provided in the first side hook 70L and the second side hook 70R. The opening / closing guide hole 73 extends along the movement direction of the sleeve 71 and has a shape that converts the linear movement of the opening / closing pin 71a, which moves in conjunction with the sleeve 71, into an opening / closing operation due to the rotation of the first side hook 70L and the second side hook 70R about the shaft 71b as a fulcrum.

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

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

[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 unit 3A passes between the center hook 70C and the first side hook 70L. The wire W passing between the center hook 70C and the first side hook 70L is guided to the curl forming unit 5A. The wire W is curled by the curl forming unit 5A and guided to the bundling unit 7A, and passes between the center hook 70C and the second side hook 70R.

[0061] In the wire locking body 70, as the sleeve 71 moves forward as indicated by the arrow A1, the first side hook 70L and the second side hook 70R move in a direction approaching the center hook 70C by rotating about the shaft 71b due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73. As a result, the first side hook 70L and the second side hook 70R close against the center hook 70C.

[0062] When the first side hook 70L closes relative to the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a manner that allows the wire W to move between the first side hook 70L and the center hook 70C. When the second side hook 70R closes relative to the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a manner that prevents the wire W from slipping 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 presses and bends the tip side, which is one end of the wire W, in a predetermined direction to form the wire W into a predetermined shape. The wire locking body 70 also includes a bending portion 71c2 that presses and bends the other end, which is the terminal side, of the wire W cut at the cutting portion 6A in a predetermined direction to form the wire W into a predetermined shape.

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

[0065] After the wire W is cut at the cutting portion 6A, the sleeve 71 further moves forward as indicated by the arrow A1, thereby pushing the tip side of the wire W, which is engaged with the center hook 70C and the second side hook 70R, with the bending portion 71c1, thereby bending it toward the reinforcing bar S. In addition, the sleeve 71 pushes the end side of the wire W, which is engaged with the center hook 70C and the first side hook 70L and which is cut at the cutting portion 6A, with the bending portion 71c2, thereby bending it toward the reinforcing bar S.

[0066] The bundling portion 7A includes a rotation restricting portion 74 that restricts the rotation of the wire locking body 70 and the sleeve 71 in response to the rotational movement of the rotating shaft 72. The rotation restricting portion 74 includes a rotation restricting blade 74a provided on the sleeve 71 and a rotation restricting claw 74b provided on the main body portion 10A.

[0067] The rotation restriction blade 74a is configured by providing a plurality of protrusions that protrude radially from the outer periphery of the sleeve 71 at predetermined intervals in the circumferential direction of the sleeve 71. The rotation restriction blade 74a is fixed to the sleeve 71 and moves and rotates integrally with the sleeve 71.

[0068] In the rotation restricting portion 74, the wire W is locked by the wire locking body 70, the wire W is wound around the reinforcing bar S, and then the wire W is cut by the cutting portion 6A. In the operation range in which the wire W is bent and shaped by bending portions 71c1 and 71c2 of the sleeve 71, the rotation restricting blade 74a is locked by the rotation restricting claw 74b. When the rotation restricting blade 74a is locked by the rotation restricting claw 74b, the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72 is restricted, and the rotation of the rotating shaft 72 moves the sleeve 71 in the front-rear direction.

[0069] In addition, in the motion range in which the wire W locked by the wire locking body 70 is twisted, the rotation restricting blade 74a is released from the rotation restricting claw 74b. When the rotation restricting blade 74a is released from the rotation restricting claw 74b, the sleeve 71 rotates in conjunction with the rotation of the rotating shaft 72. In the wire locking body 70, the center hook 70C, the first side hook 70L, and the second side hook 70R that have locked the wire W rotate in conjunction with the rotation of the sleeve 71. In the motion range of the sleeve 71 and the wire locking body 70 along the axial direction of the rotating shaft 72, the motion range in which the wire W is locked by the wire locking body 70 is referred to as the first motion range. In addition, the motion range in which the wire W locked by the wire locking body 70 is twisted in the first motion range is referred to as the second motion range.

[0070] The binding portion 7A is provided such that the movable member 83 is movable in conjunction with the sleeve 71. The movable member 83 is attached rotatably relative 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 moving member 83 has an engaging portion 83a that engages with the transmission mechanism 62. When the moving member 83 moves in the front-rear direction in conjunction with the sleeve 71, the transmission mechanism 62 transmits the movement of the moving member 83 to the movable blade unit 61, causing the movable blade unit 61 to rotate. As a result, the movable blade unit 61 rotates in a predetermined direction as the sleeve 71 moves forward, and the wire W is cut.

[0072] The binding portion 7A includes a tensioning spring 92 that enables binding while applying tension to the wire W. The tensioning spring 92 is provided on the outside of the sleeve 71, and biases the sleeve 71 and the wire locking body 70 in a direction away from the abutment portion 91 along the axial direction of the rotating shaft 72. The tensioning spring 92 is formed, for example, of a coil spring that expands and contracts in the axial direction, and is fitted around the outer periphery of the sleeve 71 between the rotation restricting blade 74a and the support frame 76d that supports the sleeve 71 so that it can rotate and slide in the axial direction.

[0073] The tensioning spring 92 is compressed between the support frame 76d and the rotation restricting blade 74a depending on the position of the sleeve 71 along the axial direction of the rotating shaft 72, and urges the sleeve 71 backward, that is, in a direction away from the abutting portion 91 along the axial direction of the rotating shaft 72. As a result, the tensioning spring 92 urges the wire locking body 70 equipped with the sleeve 71 in a direction that maintains the tension applied to the wire W by feeding the wire W in the reverse direction and winding it around the reinforcing bar S.

[0074] As a result, when the sleeve 71 moves forward and is compressed, the tensioning spring 92 applies a tension to the wire W that is wound around the reinforcing bar S and then cut at the cutting portion 6A with a force greater than the force acting in the direction in which the wire W wound around the reinforcing bar S loosens. This makes it possible to perform bundling while applying tension to the wire W after it is cut.

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

[0076] <Example of operation of the reinforcing bar binding machine according to the present embodiment> Next, an operation of binding a reinforcing bar S with a wire W by the reinforcing bar binding machine 1A of this embodiment will be described with reference to each drawing.

[0077] When the reinforcing bar S is placed between the curl guide 50 and the induction 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 the case of a configuration in which reinforcing bars S are bound using multiple wires, for example two wires W, the two wires W are fed in parallel along the axial direction of the loop Ru formed by the wires W by the wire guide 4A.

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

[0080] The wire W having been curled by the curl guide 50 is guided by the induction guide 51. Figures 4A, 4B, and 4C are explanatory diagrams showing the movement of the wire in the induction guide, and next, the effect of guiding the wire W by the induction guide 51 will be described.

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

[0082] In the induction guide 51, when the tip WS of the wire W entering toward the side surface portion 52a comes into contact with the side surface portion 52a, resistance increases when the tip WS of the wire W is guided along the side surface portion 52a. When the amount of movement of the tip WS of the wire W along the side surface portion 52a decreases due to resistance caused by friction and the amount of feed of the wire W fed in the forward direction becomes relatively large, the diameter of the loop Ru formed by the wire W having a curling tendency given by the curl guide 50 gradually increases.

[0083] When the wire W guided by the induction guide 51 is sent in the positive direction, the diameter of the loop Ru gradually increases, and it is possible for the wire W to enter the induction recess 57b up to a position where it contacts the bottom surface portion 53a of the second guide portion 53.

[0084] As a result, when the wire W is guided by the induction guide 51 and its tip WS comes into contact with the side portion 52a, the diameter of the loop Ru gradually increases as shown in Figure 4B, and the wire W enters the induction recess 57b, so that it comes into contact with the induction promotion portion 57a ​​upstream of the induction recess 57b in the feed direction of the wire W.

[0085] The wire W guided by the guide 51 comes into contact with the guide promotion portion 57a, and a force that changes the feed path of the wire W advancing toward the side surface portion 52a acts on the wire W. As a result, the wire W guided by the guide 51 is further fed in the forward direction, whereby the tip WS is guided in a direction away from the side surface portion 52a, and can be introduced into the narrowest portion 55b toward the third guide portion 54b as shown in Fig. 4C.

[0086] In addition, when the wire W is guided by the induction guide 51 and the tip WS comes into contact with the side surface portion 52a, a force that changes the feed path of the wire W entering toward the side surface portion 52a acts on the wire W by contacting the approach angle restriction portion 56 before contacting the induction promotion portion 57a. As a result, the wire W guided by the induction guide 51 is further fed in the forward direction, whereby the tip WS is guided in a direction away from the side surface portion 52a, and can be introduced into the narrowest portion 55b toward the third guide portion 54b.

[0087] The wire W having been curled by the curl guide 50 is guided by the induction guide 51 and further fed in the forward direction by the wire feed unit 3A, so that the wire W is guided by the induction guide 51 to between the center hook 70C and the second side hook 70R. The wire W is then fed until its tip abuts against the feed restriction unit 90. When the wire W is fed to a position where its tip abuts against the feed restriction unit 90, the drive of the feed motor 31 is stopped.

[0088] After the forward feed of the wire W is stopped, the motor 80 is driven in the forward rotation direction. In the first operating range in which the wire locking body 70 locks the wire W, the rotation restricting blade 74a is locked by the rotation restricting claw 74b, thereby restricting the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72. As a result, the rotation of the motor 80 is converted into linear movement, and the sleeve 71 moves in the forward direction, that is, in the direction of the arrow A1.

[0089] 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 toward the center hook 70C by rotating about the shaft 71b. 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.

[0090] The second side hook 70R also moves toward the center hook 70C by rotating about the shaft 71b. When the second side hook 70R closes against the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a manner that prevents the wire W from slipping out between the second side hook 70R and the center hook 70C.

[0091] After the sleeve 71 is advanced to a position where the first side hook 70L and the second side hook 70R are closed to lock the wire W, the rotation of the motor 80 is temporarily stopped and the feed motor 31 is driven in the reverse rotation direction.

[0092] As a result, the pair of feed gears 30 rotate in the reverse direction, and the wire W held between the pair of feed gears 30 is fed in the reverse direction indicated by the arrow R. Since the tip end of the wire W is secured between the second side hook 70R and the center hook 70C in a manner that prevents it from slipping out, the wire W is wound around the reinforcing bar S by the operation of feeding the wire W in the reverse direction.

[0093] After winding 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 the arrow A1.

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

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

[0096] In contrast, in the present embodiment, the rebar tying machine 1A moves the sleeve 71 and the wire locking body 70 forward, and in the operating range in which the wire W is cut, the rotation limiting blade 74a contacts the tensioning spring 92, and the tensioning spring 92 is compressed between the support frame 76d and the rotation limiting blade 74a, so that the sleeve 71 and the wire locking body 70 are urged backward by the tensioning spring 92.

[0097] This prevents the sleeve 71 from moving forward, thereby preventing a decrease in the force pulling the wire W locked by the wire locking body 70 backward, and prevents the wire W wound around the reinforcing bar S from loosening before it is twisted.

[0098] By driving the motor 80 in the forward rotation direction, the sleeve 71 moves forward as indicated by the arrow A1 to cut the wire W, and at the same time, the bent portion 71c1 moves in a direction approaching the rebar S. As a result, the tip side of the wire W engaged with the center hook 70C and the second side hook 70R is pressed toward the rebar S by the bent portion 71c1, and is bent toward the rebar S with the engaged position as a fulcrum. As the sleeve 71 moves further forward, the wire W engaged between the second side hook 70R and the center hook 70C is held in a state where it is sandwiched by the bent portion 71c1.

[0099] Furthermore, the end of the wire W that is held between the first wire holding portion 71c2a and the second wire holding portion 71c2b constituting the bending portion 71c2 of the sleeve 71 and the slip-out prevention portion 70La of the first side hook 70L and that has been cut at the cutting portion 6A is further pressed toward the reinforcing bar S by the bending portion 71c2, and is bent toward the reinforcing bar S with the locking position as a fulcrum. As the sleeve 71 moves further forward, the wire W that is locked between the first side hook 70L and the center hook is held in a state where it is sandwiched by the bending portion 71c2.

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

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

[0102] In the second operating range of the binding portion 7A, the wire W locked by the wire locking body 70 is twisted, and a force is applied to the wire locking body 70 that pulls the wire locking body 70 forward along the axial direction of the rotation shaft 72. Meanwhile, as the sleeve 71 moves forward to a position where it can rotate, the tensioning spring 92 is further compressed, and the sleeve 71 is subjected to a force that pushes it backward by the tensioning spring 92.

[0103] As a result, when a force is applied to the wire locking body 70 to move it forward in the axial direction, the sleeve 71 is pushed backward by the tensioning spring 92, and the rotating shaft 72 is pushed backward by the spring 72c, moving forward, twisting the wire W as it moves forward.

[0104] As a result, the portion of the wire W locked by the wire locking body 70 is pulled backward, tension is applied in the tangential direction of the reinforcing bar S, and the wire W is pulled so as to come into close contact with the reinforcing bar S. In the second operating range in which the sleeve 71 rotates to twist the wire W, the wire locking body 70 further rotates in conjunction with the rotating shaft 72, and the wire W is further twisted as the wire locking body 70 and the rotating shaft 72 move forward in a direction in which the gap between the twisted portion of the wire W and the reinforcing bar S becomes smaller.

[0105] Therefore, the wire W is twisted while moving forward with the wire locking body 70 and the rotating shaft 72 receiving the force pushing backward by the tensioning spring 92 and the spring 72c, so that the gap between the twisted part of the wire W and the reinforcing bar S becomes smaller, and the wire W adheres closely to the reinforcing bar S in a manner that follows the reinforcing bar S. This removes the slack in the wire W before twisting, and the wire W can be tied in a state where it is in close contact with the reinforcing bar S.

[0106] When it is detected that the load on the motor 80 has reached a maximum by twisting the wire W, the forward rotation of the motor 80 is stopped. Next, the motor 80 is driven in the reverse rotation direction, causing the rotating shaft 72 to rotate reversely, and when the sleeve 71 rotates reversely following the reverse rotation of the rotating shaft 72, the rotation restricting blade 74a is engaged with the rotation restricting claw 74b, thereby restricting the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72. As a result, the sleeve 71 moves backward, in the direction of arrow A2.

[0107] When the sleeve 71 moves rearward, the bent portions 71c1 and 71c2 move away from the wire W, and the holding of the wire W by the bent portions 71c1 and 71c2 is released. Furthermore, 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 in a direction away from the center hook 70C by rotating about the shaft 71b. Furthermore, the second side hook 70R moves in a direction away from the center hook 70C by rotating about the shaft 71b. As a result, the wire W comes out of the wire locking body 70. [Explanation of symbols]

[0108] 1A rebar tying machine, 10A main body, 11A handle, 2A magazine, 20 reel, 3A wire feed section, 30 feed gear, 31 feed motor, 4A wire guide, 5A curl forming section, 50 curl guide, 51 induction guide, 52 first guide section, 52a, 52b side section, 53 Second guide portion, 53a... bottom surface portion, 54... third guide portion, 54a... guide surface, 55a... opening end portion, 55b... narrowest portion, 56... approach angle regulating portion, 57a... guide promoting portion, 57b... guide recess, 6A... cutting portion, 7A... bundling portion, 70... wire retaining body, 72... rotating shaft, 8A... drive portion, 80... motor, W... wire

Claims

1. a wire feed unit for feeding a wire to be wound around a bundle; A bundling unit that twists the wire wound around the bundling object; a curl guide for curling the wire fed by the wire feeding unit; a guide for guiding the wire curled by the curl guide to the bundling section, The induction guide has an induction promotion part that contacts the wire from a radially outer side of the loop formed by the wire curled by the curl guide and applies a force to the wire to change the feed path of the wire; a guide recess provided downstream of the guide promotion portion with respect to the wire feed direction and receiving the wire extending radially outward of the loop; a first guide portion having a pair of side surfaces that regulates an axial position of a loop formed by the wire curled by the curl guide; a second guide portion having a bottom surface portion connecting the pair of side surfaces and regulating a radial position of the loop; a focusing passage formed of a space surrounded by a pair of the side surfaces and the bottom surface, the focusing passage having an opening end into which the wire curled by the curl guide enters, the distance between the pair of the side surfaces narrowing along the wire entry direction; the induction promotion portion is provided on the opening end side from the center of the bottom surface portion along the wire feed direction and protrudes from the bottom surface portion in the curl guide direction, The focusing passage is provided downstream of the induction promoting section along the wire feeding direction. Binding machine.

2. The height at which the induction promotion portion protrudes from the bottom surface portion is a height at which the tip of the wire guided by the induction guide does not come into contact with the protruding portion. The strapping machine according to claim 1.

3. The induction promotion portion is configured by providing a convex portion protruding in the direction of the curl guide. The binding machine according to claim 1 or 2.

4. The induction promotion unit is composed of a rotating member that can rotate when the wire comes into contact with the rotating member. The binding machine according to claim 1 or 2.

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