End Machine

Abstract

To provide a binder adapted to wind a wire around an object to be bound.SOLUTION: A binder comprises a curl guide 50 having a guide member 53H to give a wire W a tendency toward curling, in which the guide member 53H is provided in a position to give the wire W a tendency toward curling and fixed on the curl guide 50. The guide member 53H comprises a leading portion 53J that is structured, for example, in a tapered shape at a portion where the wire W fed reverse by a wire feed unit 3A is to contact so as to lead the wire W. The guide member 53H allows the wire W fed reverse to come into contact with the leading portion 53J, thereby leading the wire W wound around reinforcement bars radially inward a loop formed by the wire W wound around the reinforcement bars.SELECTED DRAWING: Figure 8B

Description

[Technical field]

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

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

[0003] Conventionally, a binding machine called a rebar binding machine has been proposed that winds wire around two or more rebars and twists the wire wound around the rebars to bind the two or more rebars with the wire. The binding machine includes a binding wire feed mechanism that feeds out the wire wound on a reel and winds it around the rebars, a gripping mechanism that grips the wire wound around the rebars, and a binding wire twisting mechanism that rotates and drives the gripping mechanism to twist the wire. The wire feed mechanism, gripping mechanism, and wire twisting mechanism operate in sequence by operating a trigger to perform one cycle of binding operations.

[0004] When binding reinforcing bars with wire, if the binding is loose, the reinforcing bars will slip apart, so it is necessary to hold the reinforcing bars firmly together. Therefore, a technology has been proposed in which the wire wound around the reinforcing bars is fed in the opposite direction and wound around the reinforcing bars (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-142813 A Summary of the Invention [Problem to be solved by the invention]

[0006] In conventional strapping machines, the wire is wound around the rebar along the nose and lower guide arm, the wire is secured by a clamping device, and then the wire is fed in the reverse direction.

[0007] In this case, the wire wound around the rebar moves from the part of the wire along the nose in a direction approaching the rebar. When the part of the wire along the nose moves to a position where it contacts the rebar, the load of sending the wire in the reverse direction increases due to friction between the wire and the rebar. As a result, the part of the wire along the lower guide arm cannot be pulled back sufficiently, and there is a possibility that the wire cannot be wound around the rebar.

[0008] The present invention has been made to solve such problems, and has an object to provide a binding machine that is capable of winding a wire around an object to be bound. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the present invention provides a bundling unit that includes a wire feed unit that feeds a wire, a curl guide that imparts a curl to the wire fed in the forward direction by the wire feed unit, and a bundling unit that twists the wire that is fed in the reverse direction by the wire feed unit and wound around a bundle, the bundling unit having a wire locking body that locks the tip side of the wire that is fed in the forward direction by the wire feed unit, imparted with a curl by the curl guide, and wound around the bundle, and a wire that is wound around the bundle and has its tip locked, the wire that is wound around the bundle and has its tip locked is positioned on the opposite side of the curl guide with respect to the bundle, relative to the bundle, from the first side wire located in the curl guide. and a pulling means for first pulling the second side wire positioned in the direction of the object to be bound, the pulling means being arranged on the wire introduction side of the curl guide and radially inside the loop formed by the wire wound around the object to be bound, the guide member having a guide member which guides the wire wound around the object to be bound, the guide member having a tapered portion where it comes into contact with the wire fed in the reverse direction by the wire feed section, and a guide portion where the wire comes into contact with this tapered portion, thereby guiding the wire wound around the object to be bound in the radially inward direction of the loop.

[0010] In the present invention, of the wires wound around the bundle and with their tips secured, the second side wire located on the opposite side of the curl guide from the bundle is first pulled toward the bundle, and then the first side wire located in the curl guide is pulled toward the bundle. Effect of the Invention

[0011] Of the wires wound around the object to be bundled and with their ends secured, the first wire located in the curl guide is fed in the reverse direction, with less friction caused by the wire coming into contact with the object to be bundled. This allows the wire to be securely wrapped around the object to be bundled by first pulling the second wire, located on the opposite side of the curl guide from the object, toward the object to be bundled, and then pulling the first wire, located in the curl guide, toward the object to be bundled. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a side view showing an example of the overall configuration of a reinforcing bar binding machine. [Figure 2A] FIG. 4 is a perspective view showing an example of a binding portion. [Figure 2B] FIG. 4 is a cross-sectional plan view showing an example of a binding portion. [Figure 2C] FIG. 4 is a cross-sectional plan view showing an example of a binding portion. [Figure 3A] FIG. 4 is a side view illustrating an example of a guide member retracting mechanism according to the first embodiment. [Figure 3B] 5A to 5C are bottom cross-sectional views illustrating an example of operation of the guide member retracting mechanism according to the first embodiment. [Figure 3C] 5A to 5C are bottom cross-sectional views illustrating an example of operation of the guide member retracting mechanism according to the first embodiment. [Figure 3D] 5A to 5C are front sectional views showing an example of operation of the guide member retracting mechanism according to the first embodiment. [Figure 3E] 5A to 5C are front sectional views showing an example of operation of the guide member retracting mechanism according to the first embodiment. [Figure 4] FIG. 2 is a block diagram showing an example of a control function of the reinforcing bar binding machine. [Figure 5A] FIG. 11 is an explanatory diagram showing an example of an operation of binding reinforcing bars by a reinforcing bar binding machine. [Figure 5B] FIG. 11 is an explanatory diagram showing an example of an operation of binding reinforcing bars by a reinforcing bar binding machine. [Figure 5C] FIG. 11 is an explanatory diagram showing an example of an operation of binding reinforcing bars by a reinforcing bar binding machine. [Figure 5D] FIG. 11 is an explanatory diagram showing an example of an operation of binding reinforcing bars by a reinforcing bar binding machine. [Figure 5E] FIG. 11 is an explanatory diagram showing an example of an operation of binding reinforcing bars by a reinforcing bar binding machine. [Figure 5F] FIG. 11 is an explanatory diagram showing an example of an operation of binding reinforcing bars by a reinforcing bar binding machine. [Figure 6A] FIG. 11 is a side view illustrating an example of a guide member retracting mechanism according to the second embodiment. [Figure 6B] 13A and 13B are bottom cross-sectional views illustrating an example of operation of the guide member retracting mechanism according to the second embodiment. [Figure 6C] 13A and 13B are bottom cross-sectional views illustrating an example of operation of the guide member retracting mechanism according to the second embodiment. [Figure 6D] 13 is a front cross-sectional view showing an example of operation of the guide member retracting mechanism of the second embodiment. FIG. [Figure 6E] 13 is a front cross-sectional view showing an example of operation of the guide member retracting mechanism of the second embodiment. FIG. [Figure 7A] FIG. 13 is a side view illustrating an example of a guide member retracting mechanism according to the third embodiment. [Figure 7B] 13A to 13C are bottom cross-sectional views illustrating an example of operation of the guide member retracting mechanism according to the third embodiment. [Figure 7C] 13 is a front cross-sectional view showing an example of operation of a guide member retracting mechanism according to the third embodiment. FIG. [Figure 7D] 13 is a front cross-sectional view showing an example of operation of a guide member retracting mechanism according to the third embodiment. FIG. [Figure 7E] 13 is a front cross-sectional view showing an example of operation of a guide member retracting mechanism according to the third embodiment. FIG. [Figure 7F] 13 is a front cross-sectional view showing an example of operation of a guide member retracting mechanism according to the third embodiment. FIG. [Figure 8A]FIG. 13 is a side view showing an example of a guide member according to another modified example. [Figure 8B] 13A and 13B are front cross-sectional views showing an example of operation of a guide member according to another modified example. [Figure 9] FIG. 13 is a side view of a main portion showing a modified example of the binding machine. [Figure 10] FIG. 11 is a side view of a main portion showing another modified example of the binding machine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] 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.

[0014] <Example of rebar binding machine configuration> 1 is a side view showing an example of the overall configuration of a reinforcing bar binding machine. The reinforcing bar binding machine 1A is designed to be held by an operator and includes a main body 10A and a handle 11A.

[0015] In addition, the rebar binding machine 1A feeds the wire W in the forward direction indicated by the arrow F, winding it around the rebar S to be bound, and then feeds the wire W wound around the rebar S in the reverse direction indicated by the arrow R to wind it around the rebar S. After that, the wire W is twisted and the rebar S is bound with the wire W.

[0016] To achieve the above-mentioned functions, the reinforcing bar binding machine 1A is equipped with a magazine 2A that stores the wire W and a wire feeding unit 3A that feeds the wire W. The reinforcing bar binding machine 1A also includes 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.

[0017] The magazine 2A rotatably and detachably stores a reel 20 around which a long wire W is wound so as to be payable. The wire W may be a wire made of a metal wire capable of plastic deformation, 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.

[0018] The wire feeding unit 3A includes a pair of feed gears 30 that clamp and feed one wire W or multiple wires W arranged in parallel. The wire feeding unit 3A rotates the feed gear 30 by transmitting the rotational operation of a feed motor (not shown). As a result, the wire feeding unit 3A feeds the wire W clamped between the pair of feed gears 30 along the extension direction of the wire W. In a configuration in which multiple wires W, for example two wires W, are fed, the two wires W are fed in a parallel state.

[0019] In the wire feed unit 3A, the rotation direction of the feed motor (not shown) is switched between forward and reverse, thereby switching the rotation direction of the feed gear 30 and switching the feed direction of the wire W between forward and reverse.

[0020] The curl forming unit 5A includes a curl guide 50, which is an example of a first guide unit that imparts a curl to the wire W fed by the wire feeding unit 3A, and an induction guide 51, which is an example of a second guide unit that guides the wire W curled by the curl guide 50 to the bundling unit 7A. In the rebar binding 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 dashed line in FIG. 1, and the wire W is wound around the rebar S.

[0021] The curl forming unit 5A includes guide members 53, 53b that guide the wire W fed in the forward direction and give the wire W a curl. The guide member 53 constitutes a pulling means that pulls the wire W from a predetermined side in cooperation with the wire feed unit 3A. The guide member 53 is provided on the curl guide 50 at the introduction side of the wire W fed by the wire feed unit 3A, and is positioned radially inside the loop Ru formed by the wire W. The guide member 53 restricts the wire W so that it does not enter the radial inside of the loop Ru.

[0022] The guide member 53b is provided on the discharge side of the wire W fed by the wire feed unit 3A in the curl guide 50, and is disposed radially outside the loop Ru formed by the wire W.

[0023] The curl forming unit 5A is equipped with a guide member moving mechanism 54A that retracts the guide member 53. The guide member moving mechanism 54A constitutes a pulling means that pulls the wire W from a predetermined side in cooperation with the wire feeding unit 3A, and after the wire W is wound around the reinforcing bar S, it retracts the guide member 53 in conjunction with the operation of the binding unit 7A.

[0024] 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. The transmission mechanism 62 transmits the operation of the binding unit 7A to the movable blade unit 61 via a moving member 83, and rotates the movable blade unit 61 in conjunction with the operation of the binding unit 7A to cut the wire W.

[0025] The bundling unit 7A includes a wire locking body 70 that locks the wire W. A detailed embodiment of the bundling unit 7A will be described later. The driving unit 8A includes a motor 80 and a reducer 81 that reduces speed and amplifies torque.

[0026] The reinforcing bar binding machine 1A is provided with a feed restricting unit 90 against which the tip of the wire W abuts, in the feed path of the wire W locked by the wire locking body 70. In addition, 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. 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.

[0027] In addition, the rebar binding machine 1A has a handle section 11A extending downward from the main body section 10A. Furthermore, a battery 15A is detachably attached to the lower part of the handle section 11A. In the rebar binding machine 1A, a magazine 2A is provided in front of the handle section 11A. In the rebar binding machine 1A, the above-mentioned wire feeding section 3A, cutting section 6A, binding section 7A, drive section 8A that drives the binding section 7A, etc. are stored in the main body section 10A.

[0028] The rebar binding machine 1A is provided with a trigger 12A on the front side of a handle portion 11A, and a switch 13A inside the handle portion 11A. Also, a board 100 on which a circuit constituting a control unit is mounted is provided in the main body portion 10A.

[0029] FIG. 2A is a perspective view showing an example of a binding part, and FIGS. 2B and 2C are cross-sectional plan views showing an example of a binding part. Next, the configuration of the binding part will be described with reference to each drawing.

[0030] 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.

[0031] The wire locking body 70 comprises a center hook 70C connected to a rotating shaft 72, a first side hook 70R and a second side hook 70L that open and close relative to the center hook 70C, and a sleeve 71 that actuates the first side hook 70R and the second side hook 70L and shapes the wire W into a desired shape.

[0032] In the binding portion 7A, the side where the center hook 70C, the first side hook 70R, and the second side hook 70L are provided is the front side, and the side where the rotating shaft 72 is connected to the reducer 81 is the rear side.

[0033] 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.

[0034] The first side hook 70R 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 70R has a rear end, which is the other end along the axial direction of the rotating shaft 72, rotatably supported by the center hook 70C via a shaft 71b.

[0035] The second side hook 70L 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 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 the shaft 71b.

[0036] As a result, the wire locking body 70 rotates about the shaft 71b, opening and closing the tip of the first side hook 70R in the direction of approaching and separating from the center hook 70C, and the tip of the second side hook 70L in the direction of approaching and separating from the center hook 70C.

[0037] The rotating shaft 72 is connected at its other end, or rear 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, that is, in a direction approaching the reducer 81. As a result, the rotating shaft 72 is configured to be movable forward, that is, in a direction away from the reducer 81, while receiving a force pulling the rotating shaft 72 rearward by the spring 72c.

[0038] The sleeve 71 is supported rotatably and axially slidably by a support frame 76. The support frame 76 is an annular member, and is attached to the main body 10A in a manner that makes it unrotatable in the circumferential direction and unmovable in the axial direction.

[0039] The sleeve 71 has a convex portion (not shown) that protrudes from the inner circumferential surface of the space into which the rotating shaft 72 is inserted, and this convex portion fits into a groove of a feed screw 72a 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. In addition, the sleeve 71 rotates integrally with the rotating shaft 72.

[0040] The sleeve 71 includes an opening / closing pin 71a that opens and closes the first side hook 70R and the second side hook 70L.

[0041] The opening / closing pin 71a is inserted into an opening / closing guide hole 73 provided in the first side hook 70R and the second side hook 70L. 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 70R and the second side hook 70L about the shaft 71b as a fulcrum.

[0042] As the sleeve 71 moves in the rear direction indicated by the arrow A2, the wire locking body 70 moves the first side hook 70R and the second side hook 70L in a direction away from the center hook 70C by a rotational motion 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.

[0043] This causes the first side hook 70R and the second side hook 70L 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 70R and the center hook 70C, and between the second side hook 70L and the center hook 70C.

[0044] When the first side hook 70R and the second side hook 70L 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 70R. The wire W passing between the center hook 70C and the first side hook 70R 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 70L.

[0045] In the wire locking body 70, as the sleeve 71 moves forward as indicated by the arrow A1, the first side hook 70R and the second side hook 70L 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 70R and the second side hook 70L close against the center hook 70C.

[0046] When the first side hook 70R closes against the center hook 70C, the wire W sandwiched between the first side hook 70R and the center hook 70C is locked in a manner that allows the wire W to move between the first side hook 70R and the center hook 70C. When the second side hook 70L closes against the center hook 70C, the wire W sandwiched between the second side hook 70L and the center hook 70C is locked in a manner that prevents the wire W from slipping out from between the second side hook 70L and the center hook 70C.

[0047] The sleeve 71 has a bending portion 71c1 which forms the wire W into a predetermined shape by pushing and bending the tip side, which is one end of the wire W, in a predetermined direction, and a bending portion 71c2 which forms the wire W into a predetermined shape by pushing and bending the other end, which is the terminal side, of the wire W cut at the cutting portion 6A, in a predetermined direction.

[0048] As the sleeve 71 moves forward as indicated by the arrow A1, the bending portion 71c1 pushes the tip side of the wire W, which is engaged with the center hook 70C and the second side hook 70L, and bends it toward the reinforcing bar S. As the sleeve 71 moves forward as indicated by the arrow A1, the bending portion 71c2 pushes the end side of the wire W, which is engaged with the center hook 70C and the first side hook 70R and cut at the cutting portion 6A, and bends it toward the reinforcing bar S.

[0049] 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.

[0050] 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.

[0051] The rotation restriction claw 74b includes a first claw portion 74b1 and a second claw portion 74b2 as a pair of claw portions opposed to each other with a gap allowing the rotation restriction blade 74a to pass through. The first claw portion 74b1 and the second claw portion 74b2 are configured to be able to retreat from the trajectory of the rotation restriction blade 74a by being pushed by the rotation restriction blade 74a in accordance with the rotation direction of the rotation restriction blade 74a.

[0052] When the rotation restricting blade 74a is engaged with the rotation restricting claw 74b, the rotation restricting portion 74 restricts the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72, and the sleeve 71 moves in the front-rear direction due to the rotation of the rotating shaft 72. When the rotation restricting blade 74a is disengaged from the rotation restricting claw 74b, the sleeve 71 rotates linked to the rotation of the rotating shaft 72.

[0053] Fig. 3A is a side view showing an example of the guide member moving mechanism of the first embodiment, Fig. 3B and Fig. 3C are bottom sectional views showing an example of the operation of the guide member moving mechanism of the first embodiment, Fig. 3D and Fig. 3E are front sectional views showing an example of the operation of the guide member moving mechanism of the first embodiment, and next, an example of the guide member moving mechanism of the first embodiment will be described with reference to each figure. Fig. 3B and Fig. 3C show the AA cross section of Fig. 3A, and Fig. 3D and Fig. 3E show the BB cross section of Fig. 3A.

[0054] The guide member moving mechanism 54A of the first embodiment includes a guide member support portion 55A to which the guide member 53 is attached, and a guide member actuation portion 56A that actuates the guide member support portion 55A.

[0055] The guide member support portion 55A is provided with a guide member 53 at one end portion in a form extending in the axial direction of the rotating shaft 72 shown in FIG. 2B, FIG. 2C, etc. In this example, the guide member 53 is a cylindrical pin, and protrudes laterally from the guide member support portion 55A. The guide member support portion 55A is rotatably supported at a portion between one end portion and the other end portion by the shaft 55G. The axial direction in which the shaft 55G extends is a vertical direction perpendicular to the extension direction of the guide member 53. Furthermore, the guide member support portion 55A is provided with an acted portion 55H at the other end portion, which is pressed by the guide member actuating portion 56A to restrict and release the restriction of the rotational movement with the shaft 55G as a fulcrum.

[0056] The guide member 53 moves between a guide position where it protrudes into the feed path of the wire W in the curl guide 50 and gives the wire W a curl, and a retracted position where it retreats sideways from the feed path of the wire W in the curl guide 50, by the rotational movement of the guide member support portion 55A with the axis 55G as a fulcrum.

[0057] The guide member actuating portion 56A extends in the axial direction of the rotating shaft 72, and is supported between one end side and the other end side by the guide protrusion 56F so as to be movable along the moving direction of the sleeve 71, which is the axial direction of the rotating shaft 72. The guide member actuating portion 56A moves in the front-rear direction, which is the axial direction of the rotating shaft 72, in conjunction with the sleeve 71, which moves with the rotation of the rotating shaft 72. The guide member actuating portion 56A also includes an acting portion 56H, which presses the acted portion 55H of the guide member support portion 55A, on one end side. Furthermore, the guide member actuating portion 56A also includes an engaging portion 56G, which engages with the sleeve 71, on the other end side.

[0058] The guide member moving mechanism 54A includes a spring 57A that biases the guide member support portion 55A in a direction in which the guide member 53 moves to the retracted position.

[0059] As shown in Fig. 3B, when guide member actuating portion 56A moves to a position where acting portion 56H of guide member actuating portion 56A presses acted portion 55H of guide member support portion 55A, guide member moving mechanism 54A restricts rotation of guide member support portion 55A about shaft 55G as a fulcrum. As a result, guide member 53 moves to the guide position as shown in Figs. 3B and 3D.

[0060] In response to this, in guide member moving mechanism 54A, when guide member actuating portion 56A moves to a position where acting portion 56H of guide member actuating portion 56A is separated from acted portion 55H of guide member support portion 55A as shown in Fig. 3C, the restriction on the rotation of guide member support portion 55A about shaft 55G is released. As a result, as shown in Figs. 3C and 3E, guide member support portion 55A rotates by being biased by spring 57A, and guide member 53 moves from the guide position to the retracted position.

[0061] Next, the interlocking of the operation of the sleeve 71 with the operations of the first side hook 70R, the second side hook 70L, the guide member 53, and the movable blade portion 61 will be described.

[0062] In a motion range in which the sleeve 71 moves back and forth along the axial direction of the rotating shaft 72 without rotating, the first side hook 70R and the second side hook 70L open and close in conjunction with the movement of the sleeve 71. Also, the guide member 53 moves between a guide position for the wire W and a retracted position. Furthermore, the movable blade 61 moves between the retracted position and a cutting position.

[0063] Among the range of motion in which the sleeve 71 moves back and forth along the axial direction of the rotating shaft 82 without rotating, the range of motion in which the first side hook 70R and the second side hook 70L are opened and closed is referred to as the first range of motion. Also, the range of motion in which the guide member 53 is moved between the guide position for the wire W and the retracted position is referred to as the second range of motion. Furthermore, the range of motion in which the movable blade 61 is moved between the retracted position and the cutting position is referred to as the third range of motion.

[0064] As the sleeve 71 moves from the start position of the first range of motion to the end position of the first range of motion, the first side hook 70R closes against the center hook 70C and the second side hook 70L closes against the center hook 70C, as shown in FIG. 2C.

[0065] While sleeve 71 moves through the first operating range, as shown in Fig. 3B, guide member actuating portion 56A moves to a position where acting portion 56H of guide member actuating portion 56A presses acted portion 55H of guide member support portion 55A. This restricts the rotation of guide member support portion 55A about shaft 55G as a fulcrum, and guide member 53 moves to the guide position as shown in Figs. 3B and 3D.

[0066] Furthermore, when sleeve 71 moves from the start position of the second range of motion, which is the end position of the first range of motion, toward the end position of the second range of motion, guide member actuating portion 56A moves to a position where acting portion 56H of guide member actuating portion 56A moves away from acted portion 55H of guide member support portion 55A, and the restriction on rotation of guide member support portion 55A about shaft 55G is released, as shown in Figure 3C. As a result, guide member support portion 55A rotates under the force of spring 57A, and guide member 53 moves from the guide position to the retracted position, as shown in Figures 3C and 3E.

[0067] Therefore, when the sleeve 71 moves to the end position of the first range of motion, the wire W is locked by the wire locking body 70. When the sleeve 71 moves to the end position of the second range of motion, the guide member 53 moves from the guide position for the wire W to the retracted position. When the sleeve 71 moves to the end position of the third range of motion, the movable blade portion 61 moves from the retracted position to the cutting position.

[0068] When the sleeve 71 moves to the end position of the third range of motion, the rotation restriction blade 74a is released from the rotation restriction claw 74b. When the rotation restriction blade 74a is released from the rotation restriction 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 70R, and the second side hook 70L that have locked the wire W rotate in conjunction with the rotation of the sleeve 71.

[0069] Fig. 4 is a block diagram showing an example of the control function of the rebar binding machine. In the rebar binding machine 1A, the control unit 14A controls the motor 80 and the feed motor 31 that drives the feed gear 30 according to the state of the switch 13A pressed by operating the trigger 12A shown in Fig. 1. The control unit 14A controls the position of the sleeve 71 by controlling the amount of rotation of the motor 80. The control unit 14A also controls the forward and reverse rotation of the feed motor 31.

[0070] The control unit 14A controls the amount of rotation of the motor 80 to move the sleeve 71 to the end position of a first operating range, thereby locking the wire W with the wire locking body 70. The control unit 14A also moves the guide member 53 from the guide position to the retracted position by moving the sleeve 71 to the end position of a second operating range. The control unit 14A also cuts the wire W by moving the sleeve 71 to the end position of a third operating range.

[0071] Then, after the control unit 14A has locked the wire W with the wire locking body 70, it links the operation of moving the guide member 53 from the guide position for the wire W to a retracted position with the operation of reversing the feed motor 31 to feed the wire W in the reverse direction, thereby winding the wire W around the reinforcing bar S.

[0072] <Example of rebar binding machine operation> 5A to 5F are operation explanatory diagrams showing an example of the operation of binding reinforcing bars with a reinforcing bar binding machine. Next, the operation of binding reinforcing bars S with wire W using the reinforcing bar binding machine 1A will be described with reference to each drawing.

[0073] The rebar binding machine 1A is in a standby state in which the wire W is clamped between a pair of feed gears 30 and the tip of the wire W is located between the clamping position of the feed gears 30 and the fixed blade portion 60 of the cutting unit 6A. In addition, in the standby state, the rebar binding machine 1A is in a state in which the first side hook 70R is open relative to the center hook 70C and the second side hook 70L is open relative to the center hook 70C, as shown in Figures 2A and 2B.

[0074] 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 control section 14A drives the feed motor 31 in the positive rotation direction, causing the wire feed section 3A to feed the wire W in the positive direction indicated by the arrow F.

[0075] In the case of a configuration in which multiple wires W, for example two wires W, are fed, the two wires W are fed in parallel along the axial direction of the loop Ru formed by the wires W by a wire guide not shown.

[0076] The wire W fed in the forward direction passes between the center hook 70C and the first side hook 70R, 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.

[0077] The wire W having been curled by the curl guide 50 is guided by the induction guide 51 as shown in Fig. 5A, and is further fed in the forward direction by the wire feed unit 3A, whereby the wire W is guided by the induction guide 51 to between the center hook 70C and the second side hook 70L. Then, the wire W is fed until the tip of the wire W abuts against the feed restriction unit 90 as shown in Fig. 5B. When the tip of the wire W is fed to a position where it abuts against the feed restriction unit 90, the control unit 14A stops driving the feed motor 31.

[0078] After stopping the forward feed of the wire W, the control unit 14A drives the motor 80 in the forward rotation direction. In the first operating range in which the wire locking body 70 locks the wire W, the rotation restricting blade 74a is locked by the rotation restricting claw 74b, thereby restricting the rotation of the sleeve 71 linked to the rotation of the 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.

[0079] When the sleeve 71 moves forward, the opening / closing pin 71a passes through the opening / closing guide hole 73. As a result, as shown in Fig. 2C, the first side hook 70R moves toward the center hook 70C by rotating about the shaft 71b as a fulcrum. When the first side hook 70R closes against the center hook 70C, the wire W sandwiched between the first side hook 70R and the center hook 70C is locked in a manner that allows it to move between the first side hook 70R and the center hook 70C.

[0080] The second side hook 70L also moves toward the center hook 70C by rotating about the shaft 71b. When the second side hook 70L closes against the center hook 70C, the wire W sandwiched between the second side hook 70L and the center hook 70C is locked in a manner that prevents the wire W from slipping out between the second side hook 70L and the center hook 70C.

[0081] After the sleeve 71 is advanced to the end position of the first operating range where the first side hook 70R and the second side hook 70L close to lock the wire W, the control unit 14A temporarily stops the rotation of the motor 80 and drives the feed motor 31 in the reverse rotation direction, thereby causing the pair of feed gears 30 to rotate in the reverse direction.

[0082] Therefore, the wire W held between the pair of feed gears 30 is fed in the reverse direction indicated by the arrow R.

[0083] The wire W wound around the reinforcing bar S and locked by the wire locking body 70 is locked in such a manner that the portion of the tip side sandwiched between the second side hook 70L and the center hook 70C does not slip out from between the second side hook 70L and the center hook 70C. Moreover, the wire W locked by the wire locking body 70 is locked in such a manner that the portion sandwiched between the first side hook 70R and the center hook 70C can move in the circumferential direction of the loop Ru along the feed path of the wire W between the first side hook 70R and the center hook 70C, and the movement of the wire W in the radial direction of the loop Ru is restricted.

[0084] The wire W is wound around the reinforcing bar S along the curl guide 50 and the guiding guide 51, and its tip is locked by the wire locking body 70. The portion of the wire W2 along the guiding guide 51, which is the second side wire located on the opposite side of the curl guide 50 with respect to the reinforcing bar S, is closer to the locking position of the wire W by the second side hook 70L and the center hook 70C than the portion of the wire W1 along the curl guide 50, which is the first side wire located in the curl guide 50. On the other hand, the portion of the wire W wound around the reinforcing bar S, which is the portion of the wire W1 along the curl guide 50, is closer to the wire feed section 3A in the direction along the feed path of the wire W, than the portion of the wire W2 along the guiding guide 51.

[0085] As a result, the wire W wound around the reinforcing bar S is fed in the reverse direction as indicated by the arrow R, and first, the portion of the wire W1 along the curl guide 50 is pulled toward the wire feed section 3A, causing the wire W1 along the curl guide 50 to move in a direction approaching the reinforcing bar S.

[0086] Now, the guide member 53, which opens and closes in conjunction with the movement of the sleeve 71, does not retract from the guide position for the wire W when the sleeve 71 is at the end position of the first operating range, and protrudes radially inward of the loop Ru of the wire W wound around the reinforcing bar S, as shown in Figures 3B and 3D.

[0087] 5C , by feeding the wire W in the reverse direction indicated by the arrow R, the portion of the wire W1 along the curl guide 50 cannot enter inside the guide member 53. By feeding the wire W in the reverse direction in this state, the portion of the wire W2 along the induction guide 51 is pulled toward the curl guide 50, and the portion of the wire W2 along the induction guide 51 approaches the reinforcing bar S.

[0088] When the wire W is pulled back a predetermined amount and the feed motor 31 is rotated in the reverse direction until the wire W2 on the side along the guide 51 comes into contact with the rebar S, the control unit 14A stops driving the feed motor 31 in the reverse rotation direction. The control unit 14A determines the timing to stop feeding the wire W in the reverse direction based on any one of the elapsed time from when the feed motor 31 started to be driven in the reverse rotation direction, the feed amount of the wire W detected by the rotation amount of the feed motor 31 or the like, the load on the wire W detected by the load on the feed motor 31 or the like, or a combination of these.

[0089] After stopping the reverse rotation of the feed motor 31, the feed motor 31 is driven in the forward rotation direction to slacken the wire W1 on the curl guide 50 side, as shown in FIG. 5D, thereby eliminating the pressure being applied to the guide member 53 by the wire W.

[0090] When the feed motor 31 is rotated in the forward direction until the wire W1 on the curl guide 50 side slackens by a predetermined amount, the control unit 14A stops driving the feed motor 31 in the forward rotation direction and then drives the motor 80 in the forward rotation direction, thereby moving the sleeve 71 forward as indicated by the arrow A1 to the end position of the second operating range in which the guide member 53 is moved from the guide position to the retracted position, as shown in FIG. 5E.

[0091] When the sleeve 71 moves forward as indicated by the arrow A1 to the end position of the second operating range, the guide member 53 retracts from the guide position for the wire W, as shown in Figures 3C and 3E. Before the operation of retracting the guide member 53, the wire W on the curl guide 50 side is slackened to eliminate any pressure on the guide member 53 that is being pressed by the wire W. This prevents the load from being applied to the guide member 53 by the wire W, and ensures that the guide member 53 moves to the retracted position.

[0092] When the motor 80 is rotated in the forward direction until the sleeve 71 moves to the end position of the second operating range, the control unit 14A stops driving the motor 80 in the forward rotation direction and then drives the feed motor 31 in the reverse rotation direction, thereby feeding the wire W in the reverse direction indicated by the arrow R.

[0093] The guide member 53, which opens and closes in conjunction with the movement of the sleeve 71, moves from the guide position for the wire W to the retracted position as described above when the sleeve 71 moves to the end position of the second operating range. Therefore, there is no protrusion that impedes the movement of the wire W toward the inside in the radial direction of the loop Ru of the wire W wound around the reinforcing bar S.

[0094] As a result, as shown in Figure 5F, by feeding the wire W in the reverse direction, the wire W1 on the side along the curl guide 50 is pulled toward the wire feeding section 3A, moving in a direction approaching the reinforcing bar S, and the wire W is wrapped around the reinforcing bar S.

[0095] When the wire W is pulled back to a position where it can be wound around the rebar S, the control unit 14A stops driving the feed motor 31 in the reverse rotation direction and then drives the motor 80 in the forward rotation direction to move the sleeve 71 forward as indicated by the arrow A1. The forward movement of the sleeve 71 is transmitted to the cutting unit 6A by the transmission mechanism 62, causing the movable blade unit 61 to rotate. When the sleeve 71 moves to the end position of the third range of motion, the wire W held by the first side hook 70R and the center hook 70C is cut by the operation of the fixed blade unit 60 and the movable blade unit 61.

[0096] Almost simultaneously with cutting the wire W, the bent portions 71c1 and 71c2 move 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 70L 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 70L and the center hook 70C is held in a state where it is sandwiched by the bent portion 71c1.

[0097] Furthermore, the end of the wire W that is engaged with the center hook 70C and the first side hook 70R and cut at the cutting portion 6A is pressed toward the reinforcing bar S by the bending portion 71c2 and bent toward the reinforcing bar S using the engaging position as a fulcrum. As the sleeve 71 moves further forward, the wire W that is engaged between the first side hook 70R and the center hook is held in a state where it is sandwiched by the bending portion 71c2.

[0098] 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.

[0099] As a result, the motor 80 is further driven in the forward rotation direction, whereby the wire locking body 70 rotates in conjunction with the rotary shaft 72, and the wire W is twisted.

[0100] When the sleeve 71 is in the operating range where it rotates, the reinforcing bar S abuts against the abutment portion 91 of the binding portion 7A, and the rearward movement of the reinforcing bar S toward the binding portion 7A is restricted. As a result, when the wire W is twisted, a force is applied that pulls the wire locking body 70 forward along the axial direction of the rotation shaft 72.

[0101] When a force moving the rotating shaft 72 forward in the axial direction is applied to the wire locking body 70, the rotating shaft 72 is configured to be able to move forward while receiving a force pushing it backward by the spring 72c. As a result, in the binding part 7A, in the operating range in which the sleeve 71 rotates, the wire locking body 70 and the rotating shaft 72 move forward to twist the wire W.

[0102] The control unit 14A detects the load on the motor 80, and when it detects that the load on the motor has reached a predetermined value, for example, the maximum load, it stops the rotation of the motor 80 in the forward direction at a predetermined timing.

[0103] Next, the control unit 14A reversely rotates the motor 80. When the motor 80 is driven in the reverse direction, 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, and the sleeve 71 moves in the direction of the arrow A2, which is the rear direction.

[0104] 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 70R moves in a direction away from the center hook 70C by rotating about the shaft 71b. Furthermore, the second side hook 70L 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.

[0105] <Examples of the effects of rebar tying machines> In conventional binding machines, the wire W was wound around the reinforcing bar S along the curl guide 50 and the induction guide 51, and then the wire W was locked by the wire locking body 70. The guide member 53 was then moved from the guide position of the wire W to a retracted position, and the wire W was then fed in the reverse direction.

[0106] In this case, in the direction along the feed path of the wire W wound around the reinforcing bar S along the curl guide 50 and the induction guide 51, the wire W1 moves from a portion along the curl guide 50 close to the wire feed section 3A toward the reinforcing bar S. When the wire W1 along the curl guide 50 moves to a position where it contacts the reinforcing bar S, the load of feeding the wire W in the reverse direction increases due to friction between the wire W and the reinforcing bar S. As a result, the wire W2 along the induction guide 51 located on the opposite side of the curl guide 50 from the reinforcing bar S cannot be sufficiently pulled back, and there is a possibility that the wire W cannot be wound around the reinforcing bar S.

[0107] In contrast, in the rebar binding machine 1A of this embodiment, as described above, the wire W is wound around the rebar S along the curl guide 50 and the induction guide 51, and then the wire W is locked by the wire locking body 70, and the wire W is fed in the reverse direction with the guide member 53 protruding into the guide position of the wire W.

[0108] As a result, in the wire W wound around the reinforcing bar S and locked by the wire locking body 70, the portion of the wire W close to the wire feed section 3A that can move in the circumferential direction of the loop Ru along the feed path of the wire W, i.e., the portion of the wire W1 along the curl guide 50, is restricted by the guide member 53 from moving in a direction approaching the reinforcing bar S. In this state, first, the portion of the wire W close to the tip side of the wire W that is locked by the wire locking body 70 and does not move in the circumferential direction of the loop Ru along the feed path of the wire W, i.e., the portion of the wire W2 along the guide guide 51 that is the wire located on the opposite side of the curl guide 50 with respect to the reinforcing bar S, is moved in a direction approaching the reinforcing bar S so that the portion of the wire W2 along the guide guide 51 comes into contact with the reinforcing bar S. Thereafter, by moving the guide member 53 from the guide position of the wire W to a retreated position and then feeding the wire W further in the reverse direction, the portion of the wire W1 along the curl guide 50 is moved in a direction approaching the rebar S, as shown in Figure 5F, so that the portion of the wire W1 along the curl guide 50 comes into contact with the rebar S, thereby enabling the wire W to be reliably wrapped around the rebar S.

[0109] <Modification of rebar tying machine> Fig. 6A is a side view showing an example of the guide member moving mechanism of the second embodiment, Fig. 6B and Fig. 6C are bottom sectional views showing an example of the operation of the guide member moving mechanism of the second embodiment, Fig. 6D and Fig. 6E are front sectional views showing an example of the operation of the guide member moving mechanism of the second embodiment, and next, an example of the guide member moving mechanism of the second embodiment will be described with reference to each figure. Fig. 6B and Fig. 6C show the CC cross section of Fig. 6A, and Fig. 6D and Fig. 6E show the DD cross section of Fig. 6A.

[0110] Guide member moving mechanism 54A of the first embodiment described above is configured to move guide member 53 to a retracted position by spring force, whereas guide member moving mechanism 54B of the second embodiment is configured to move guide member 53 to a guide position by spring force.

[0111] A guide member moving mechanism 54B of the second embodiment includes a guide member support portion 55B to which a guide member 53 is attached, and a guide member actuating portion 56B that actuates the guide member support portion 55B.

[0112] The guide member support portion 55B is provided with the guide member 53 at one end in a form extending in the axial direction of the rotating shaft 72 shown in Figs. 2B, 2C, etc. The guide member 53 is, for example, rectangular parallelepiped shaped and protrudes laterally from the guide member support portion 55B. The guide member support portion 55B is rotatably supported at a portion between one end side and the other end side by the shaft 55G. The axial direction in which the shaft 55G extends is the up-down direction perpendicular to the extension direction of the guide member 53. The guide member support portion 55B is further provided with an actuated portion 55J at the other end side, which rotates around the shaft 55G and releases the rotational movement by being pressed by the guide member actuating portion 56B.

[0113] The guide member 53 moves between a guide position where it protrudes into the feed path of the wire W in the curl guide 50 and gives the wire W a curl, and a retracted position where it retreats sideways from the feed path of the wire W in the curl guide 50, by the rotational movement of the guide member support portion 55B with the axis 55G as a fulcrum.

[0114] The guide member actuating portion 56B extends in the axial direction of the rotating shaft 72, and is supported between one end side and the other end side by the guide protrusion 56F so as to be movable along the moving direction of the sleeve 71, which is the axial direction of the rotating shaft 72. The guide member actuating portion 56B moves in the front-rear direction, which is the axial direction of the rotating shaft 72, in conjunction with the sleeve 71, which moves with the rotation of the rotating shaft 72. The guide member actuating portion 56B also includes an acting portion 56J, which presses an acted portion 55J of the guide member support portion 55B, on one end side. Furthermore, the guide member actuating portion 56B also includes an engaging portion 56G, which engages with the sleeve 71, on the other end side.

[0115] Guide member moving mechanism 54B includes spring 57B that biases guide member support portion 55A in a direction in which guide member 53 moves to the guide position. Spring 57B is formed of a torsion coil spring, and is attached to shaft 55G.

[0116] As shown in Fig. 6B, when guide member actuating portion 56B moves to a position where acting portion 56J of guide member actuating portion 56B is separated from acted portion 55J of guide member support portion 55B, guide member moving mechanism 54B releases the restriction on rotation of guide member support portion 55B about shaft 55G as a fulcrum. As a result, guide member 53 is biased by spring 57B and moves to the guide position as shown in Figs. 6B and 6D.

[0117] In contrast, in guide member moving mechanism 54B, as shown in FIG. 6C, when guide member actuating portion 56B moves to a position where acting portion 56J of guide member actuating portion 56B presses acted portion 55J of guide member support portion 55B, guide member support portion 55B is pushed by guide member actuating portion 56B and rotates, the rotation of guide member support portion 55B by spring 57B is restricted, and guide member 53 moves from the guide position to the retracted position as shown in FIG. 6C and FIG. 6E.

[0118] Fig. 7A is a side view showing an example of a guide member moving mechanism of the third embodiment, Fig. 7B is a bottom cross-sectional view showing an example of the operation of the guide member moving mechanism of the third embodiment, Fig. 7C to Fig. 7F are front cross-sectional views showing an example of the operation of the guide member moving mechanism of the third embodiment, and next, an example of the guide member moving mechanism of the third embodiment will be described with reference to each figure. Note that Fig. 7B shows an EE cross-section of Fig. 7A, Fig. 7C and Fig. 7E show FF cross-sections of Fig. 7A, and Fig. 7D and Fig. 7F show GG cross-sections of Fig. 7A.

[0119] The guide member moving mechanism 54C of the third embodiment includes a guide member 53 that curls the wire W, and a guide member 53C that restricts the movement of the wire W when the wire W is pulled back. The guide member 53C constitutes a pulling means that pulls the wire W from a predetermined side in cooperation with the wire feed section 3A, and the guide member 53C is operable independently of the sleeve 71. Note that the guide member moving mechanism 54A that moves the guide member 53 may have the same configuration as that described in Figures 3A to 3E.

[0120] A guide member moving mechanism 54C of the third embodiment includes a spring 57C that biases a guide member 53C in a direction to move to a guide position that restricts movement of the wire W when the wire W is pulled back. The guide member 53C includes a guiding portion 53G that is tapered, for example, at the tip side that contacts the wire W and generates a force to move from the guide position to the retracted position. When the wire W contacts the guiding portion 53G when the wire W is pulled back, the guide member 53C generates a force that pushes the guide member 53C in a direction to move it from the guide position to the retracted position.

[0121] The operation of guide member moving mechanism 54A that moves guide member 53 is as described above, and when guide member actuating portion 56A moves to a position where acting portion 56H of guide member actuating portion 56A presses acted portion 55H of guide member support portion 55A as shown in Fig. 7B, rotation of guide member support portion 55A about shaft 55G as a fulcrum is restricted. As a result, guide member 53 moves to the guide position as shown in Fig. 7C.

[0122] In response to this, in guide member moving mechanism 54A, when guide member actuating portion 56A moves to a position where acting portion 56H of guide member actuating portion 56A is separated from acted portion 55H of guide member support portion 55A, the restriction on the rotation of guide member support portion 55A about shaft 55G is released. As a result, as shown in Fig. 7E, guide member support portion 55A rotates by being biased by spring 57A, and guide member 53 moves from the guide position to the retracted position.

[0123] When the wire W is fed in the opposite direction and pulled back with the guide member 53 moved to the retracted position, as shown in Fig. 7D, the guide member 53C has moved to the guide position, so that the guide member 53C restricts the portion of the wire W along the curl guide 50 from moving in a direction approaching the reinforcing bar S. This allows the wire W along the induction guide 51 to first move in a direction approaching the reinforcing bar S so that it comes into contact with the reinforcing bar S.

[0124] When the wire W is further fed in the reverse direction from the state where the wire W is in contact with the guide member 53C, the guiding portion 53G generates a force pushing the guide member 53C in a direction to move it from the guide position to the retracted position, and the guide member 53C moves to the retracted position while compressing the spring 57C, as shown in Fig. 7F. This allows the portion of the wire W along the curl guide 50 to move past the guide member 53C in a direction approaching the reinforcing bar S and come into contact with the reinforcing bar S.

[0125] Fig. 8A is a side view showing an example of a guide member of another modified example, and Fig. 8B is a front sectional view showing an example of the operation of the guide member of another modified example. Next, an example of the guide member of another modified example will be described with reference to each figure. Note that Fig. 8B shows a HH cross section of Fig. 8A.

[0126] The guide member 53H of another modified example is disposed at a position where the wire W is curled, and is fixed to the curl guide 50. The guide member 53H regulates the movement of the wire W when the wire W is pulled back, and constitutes a pulling means that pulls the wire W from a predetermined side in cooperation with the wire feed unit 3A.

[0127] The guide member 53H includes a guiding portion 53J that is configured, for example, in a tapered shape at a portion that comes into contact with the wire W fed in the reverse direction by the wire feed unit 3A, and that guides the wire W. When the wire W fed in the reverse direction by the wire feed unit 3A comes into contact with the guiding portion 53J of the guide member 53H, the guide member 53H guides the wire W wound around the reinforcing bar S in a radially inward direction of the loop Ru formed by the wire W wound around the reinforcing bar S. A gap is formed between the guiding portion 53J and the opposing curl guide 50 of the guide member 53H, through which the wire W can pass.

[0128] When the wire W wound around the reinforcing bar S is fed in the opposite direction and pulled back, the wire W comes into contact with the guide member 53H, and the guide member 53H restricts the portion of the wire W along the curl guide 50 from moving in a direction approaching the reinforcing bar S. This allows the portion of the wire W along the induction guide 51 to first move in a direction approaching the reinforcing bar S so that it comes into contact with the reinforcing bar S.

[0129] By further feeding the wire W in the reverse direction from the state where the wire W is in contact with the guide member 53H, the wire W in contact with the guide member 53H follows the shape of the guide portion 53J and is guided in the radially inward direction of the loop Ru formed by the wire W wound around the reinforcing bar S. This allows the portion of the wire W along the curl guide 50 to move beyond the guide member 53H in a direction approaching the reinforcing bar S, so that the wire W can come into contact with the reinforcing bar S.

[0130] 9 is a side view of the main part of a modified reinforcing bar binding machine 1B. The modified reinforcing bar binding machine 1B has a curl forming section 5B equipped with a curl guide 50 which is an example of a first guide section, and does not have the induction guide 51 shown in FIG. 1 etc. which is an example of a second guide section.

[0131] The curl guide 50 curls the wire W fed by the wire feed section 3A and guides the wire W to the bundling section 7A, whereby the wire W is wound around the reinforcing bar S.

[0132] In the reinforcing bar binding machine 1B, the wire W is wound around the reinforcing bar S along the curl guide 50, and then the wire W is locked by the wire locking body 70, and the wire W is fed in the reverse direction with the guide member 53 protruding to the guide position of the wire W.

[0133] As a result, in the wire W wound around the reinforcing bar S and locked by the wire locking body 70, the portion of the wire W close to the wire feed section 3A that can move in the circumferential direction of the loop Ru along the wire W feed path, i.e., the portion of the wire W along the curl guide 50, is restricted by the guide member 53 from moving in the direction approaching the reinforcing bar S. In this state, first, the portion of the wire W close to the tip side of the wire W that is not movable in the circumferential direction of the loop Ru along the wire W feed path due to being locked by the wire locking body 70, i.e., the wire W located on the opposite side of the curl guide 50 with respect to the reinforcing bar S, is moved in the direction approaching the reinforcing bar S so as to come into contact with the reinforcing bar S. Thereafter, by moving the guide member 53 from the guide position of the wire W to the retreated position, the wire W is further fed in the opposite direction, and the portion of the wire W along the curl guide 50 is moved in the direction approaching the reinforcing bar S so as to come into contact with the reinforcing bar S, thereby allowing the wire W to be reliably wound around the reinforcing bar S.

[0134] 10 is a side view of the main part showing another modified example of the binding machine. In another modified example of the reinforcing bar binding machine 1C, a curl forming section 5C is provided with a curl guide 50C and an induction guide 51C. The curl forming section 5C is configured such that at least one of the curl guide 50C and the induction guide 51C can move in a direction to approach or separate from the other to open and close, and when the curl guide 50C and the induction guide 51C are closed, the curl guide 50C and the induction guide 51C are connected to each other.

[0135] The curl guide 50C curls the wire W fed by the wire feed unit 3A. The induction guide 51C guides the wire W curled by the curl guide 50C to the bundling unit 7A. This causes the wire W to be wound around the reinforcing bar S.

[0136] In the rebar binding machine 1C, the wire W is wound around the rebar S along the curl guide 50C and the induction guide 51C, and then the wire W is locked by the wire locking body 70. Then, the wire W is fed in the reverse direction with the guide member 53 protruding to the guide position of the wire W.

[0137] As a result, in the wire W wound around the reinforcing bar S and locked by the wire locking body 70, the portion of the wire W close to the wire feed section 3A that can move in the circumferential direction of the loop Ru along the wire W feed path, i.e., the portion of the wire W along the curl guide 50C, is restricted by the guide member 53 from moving in the direction approaching the reinforcing bar S. In this state, first, the portion of the wire W close to the tip side of the wire W that is not movable in the circumferential direction of the loop Ru along the wire W feed path due to being locked by the wire locking body 70, i.e., the portion of the wire W along the induction guide 51C that is the wire located on the opposite side of the curl guide 50 with respect to the reinforcing bar S, is moved in the direction approaching the reinforcing bar S so as to contact the reinforcing bar S. Then, by moving the guide member 53 from the guide position of the wire W to the retreated position, the wire W is further fed in the opposite direction, and the portion of the wire W along the curl guide 50C is moved in the direction approaching the reinforcing bar S so as to contact the reinforcing bar S, so that the wire W can be reliably wound around the reinforcing bar S. [Explanation of symbols]

[0138] REFERENCE SIGNS LIST 1A, 1B, 1C... rebar tying machine, 10A... main body, 14A... control section, 2A... magazine, 20... reel, 3A... wire feed section, 30... feed gear, 31... feed motor, 5A, 5B, 5C... curl forming section, 50, 50C... curl guide (first guide section), 51, 51C... induction guide (second guide section), 53, 53C, 53H... guide member (pulling means), 53b... guide member, 53G... induction section, 53J... induction section, 54A, 54B... guide member moving mechanism, 55A, 55B... Guide member support portion, 55G... shaft, 55H, 55J... acted upon portion, 56A, 56B... guide member operating portion, 56F... guide protrusion portion, 56G... engaging portion, 56H, 56J... acting portion, 57A, 57B, 57C... spring, 6A... cutting portion, 7A... binding portion, 70... wire retaining body, 70L... first side hook, 70R... second side hook, 70C... center hook, 71... sleeve, 72... rotating shaft, 8A... drive portion, 80... motor, 81... reducer, 91... abutment portion, W... wire

Claims

1. A wire feeding unit that feeds the wire; a curl guide for curling the wire fed in the forward direction by the wire feed unit; a bundling unit that twists the wire that has been fed in the reverse direction by the wire feed unit and wound around a bundle, the bundling unit having a wire locking body that locks a tip side of the wire that has been fed in the forward direction by the wire feed unit, has a curling tendency given by the curl guide, and is wound around the bundle; a pulling means for pulling a second side wire located on the opposite side of the curl guide with respect to the bundle toward the bundle earlier than a first side wire located on the curl guide among the wires wound around the bundle and having their ends secured thereto; Equipped with the pulling means is disposed on the wire introduction portion side of the curl guide and radially inside a loop formed by the wire wound around the bundled material, and has a guide member that guides the wire wound around the bundled material, The guide member has a guide portion that is tapered at a portion where the wire fed in the reverse direction by the wire feed portion comes into contact, and guides the wire wound around the bundle in a radially inward direction of the loop by the wire coming into contact with the tapered portion. Binding machine.

2. The guide member is fixed to the curl guide. The strapping machine according to claim 1.

3. The guide member has a gap between the induction portion and the opposing curl guide through which the wire can pass. The binding machine according to claim 1 or 2.

Images