Binding device

Abstract

The binding device is provided with a main body part and a driving part for driving the main body part, and the main body part is provided with: a reinforcing steel bar binding machine for conveying two wires around a reinforcing steel bar and twisting and binding the two wires conveyed around the reinforcing steel bar; a strapping machine moving unit that moves the reinforcing steel bar strapping machine between a strapping position at which the reinforcing steel bar is strapped and a retracted position at which the reinforcing steel bar strapping machine is separated from the reinforcing steel bar; a reel accommodating part for accommodating two reels on which one thread is wound; and a path inducing member that forms a conveying path for the wire drawn out from the two reels housed in the reel housing part between the reinforcement binding machine and the reel housing part.

Description

Technical Field

[0001] The invention relates to a binding device for binding steel bars by using silk threads. Background Art

[0002] In concrete structures, steel bars are used to increase their strength and are tied together with wires to prevent the steel bars from deviating from their prescribed positions when the concrete is poured.

[0003] Conventionally, a steel bar tying machine has been proposed that ties two or more steel bars together by winding a wire around the steel bars and twisting the wire wound around the steel bars. The steel bar tying machine is used by an operator and contains a reel wound with a wire.

[0004] In response to this, a manufacturing device for a reinforcing steel mesh using a reinforcing steel binding machine that is handheld by an operator has been proposed (for example, see Patent Document 1). In a binding device having such a reinforcing steel binding machine, a structure has been proposed in which a reel wound with a wire is housed outside the reinforcing steel binding machine.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2013-35052 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the bundling device equipped with a steel bar bundling machine, since the reel wound with the wire can be stored outside the steel bar bundling machine, it is not affected by the size of the steel bar bundling machine, and the diameter of the reel (the height of the flange part) and the width of the reel (the length of the winding core part) can be enlarged, and the winding amount of the wire can be increased to increase the wire storage capacity.

[0010] However, in the case of a rebar bundling machine that utilizes a plurality of wires to bundle rebars, if a structure is formed in which a plurality of wires are wound around a single reel, it becomes increasingly difficult to wind the plurality of wires using a single reel in a manner that avoids abnormal deformation of the wires when the wires are pulled out from the reel, a large difference in winding tendency between the plurality of wires, etc., as the reel size becomes larger and the winding amount increases, which results in an increase in management costs and a deterioration in the yield rate.

[0011] In addition, since it is not possible to fully suppress abnormal deformation of the wires and the occurrence of large winding tendency differences among the multiple wires, it becomes difficult to manage the wire conveying path from the reel outside the steel bar tying machine to the steel bar tying machine. Moreover, it affects the winding trajectory of the wires when the wires are wound around the steel bars using the steel bar tying machine.

[0012] The present disclosure has been made to solve such a problem, and an object of the present disclosure is to provide a bundling device suitable for use in a bundling mechanism that bundles reinforcing bars using a plurality of wires.

[0013] Means for solving problems

[0014] In order to solve the above-mentioned problems, the present invention discloses a bundling device, comprising a main body and a traveling part for moving the main body, wherein the main body comprises: a bundling mechanism for conveying a plurality of wires to the periphery of steel bars and twisting the plurality of wires conveyed to the periphery of the steel bars to perform bundling; a bundling mechanism moving part for moving the bundling mechanism between a bundling position for bundling the steel bars and a retreat position away from the steel bars; a reel housing part for housing a plurality of reels wound with one wire; and a path guiding part for forming a conveying path for the wires pulled out from the plurality of reels housed in the reel housing part between the bundling mechanism and the reel housing part.

[0015] In the present disclosure, a plurality of wires drawn out from a plurality of reels around which one wire is wound are fed to a bundling mechanism, and the bundling machine bundles reinforcing bars using the plurality of wires.

[0016] Effects of the Invention

[0017] According to the present disclosure, one wire is wound around each reel, and the factor of multiple wires being entangled in the reel is eliminated. In this way, by forming a structure in which one wire is wound around one reel 20, there is no need to consider the generation of a large winding tendency difference between multiple wires, and the management cost of manufacturing the reel wound with wires can be reduced, and the yield rate can be improved.

[0018] In addition, abnormal deformation of the wire caused by winding two wires on one reel can be eliminated, so the management of the wire conveying path from the reel outside the bundling mechanism to the bundling mechanism becomes easy. Moreover, the factors that affect the winding track of the wire when the wire is wound around the steel bar by the bundling mechanism can be eliminated. In addition, in a structure where the main body travels by the traveling part, it is possible to prevent multiple wires from being entangled in the reel due to vibration during travel. Thus, the occurrence of poor pulling out and poor conveying of the wire can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A It is a perspective view showing an example of the bundling device according to the first embodiment.

[0020] Figure 1B It is a perspective view showing an example of the bundling device according to the first embodiment.

[0021] Figure 1C It is a plan view showing an example of the bundling device according to the first embodiment.

[0022] Figure 1DThis is a front view showing an example of the bundling device according to the first embodiment.

[0023] Figure 2 This is a perspective view showing an example of a feeding path of a thread.

[0024] Figure 3A It is a perspective view showing an example of a path guiding member.

[0025] Figure 3B It is a perspective view showing an example of a path guiding member.

[0026] Figure 4A It is a perspective view showing an example of the bundling device according to the second embodiment.

[0027] Figure 4B This is a perspective view showing an example of a feeding path of a thread.

[0028] Figure 5A It is a perspective view showing an example of a bundling device according to a third embodiment.

[0029] Figure 5B This is a perspective view showing an example of a feeding path of a thread.

[0030] Fig. 6A It is a perspective view showing an example of a bundling device according to a fourth embodiment.

[0031] Figure 6B This is a perspective view showing an example of a feeding path of a thread.

[0032] Fig. 7A It is a perspective view showing an example of a bundling device according to a fifth embodiment.

[0033] Figure 7B This is a perspective view showing an example of a feeding path of a thread.

[0034] Figure 8 It is a side view of the main parts showing an example of the internal structure of the reinforcing bar binding machine according to the present embodiment.

[0035] Fig. 9A It is a cross-sectional plan view showing an example of a bundling portion.

[0036] Fig. 9B It is a cross-sectional plan view showing an example of a bundling portion.

[0037] Fig. 10A It is a perspective view showing an example of a bundling device according to another embodiment.

[0038] Fig. 10B It is a plan view showing an example of a bundling device according to another embodiment.

[0039] Fig. 10CThis is a front view showing an example of a bundling device according to another embodiment. DETAILED DESCRIPTION

[0040] Hereinafter, an embodiment of a binding device for binding reinforcing bars using wires will be described with reference to the drawings.

[0041] <Configuration Example of the Bundling Device of the Present Embodiment>

[0042] Figure 1A , Figure 1B is a perspective view showing an example of the bundling device according to the first embodiment, Figure 1C is a plan view showing an example of the strapping device according to the first embodiment, Figure 1D This is a front view showing an example of the bundling device according to the first embodiment.

[0043] The bundling device 100A of the first embodiment includes a main body 101 and a traveling unit 110 for moving the main body 101. The bundling device 100A includes a reinforcing bar bundling machine 1A for bundling the intersection of reinforcing bars S arranged in a lattice shape with wires W in the main body 101, and a bundling machine moving unit 10A for moving the reinforcing bar bundling machine 1A between a bundling position and a retreat position in a substantially vertical direction intersecting the arrangement surface of the reinforcing bars S.

[0044] The binding device 100A also includes a reel housing portion 200A in the main body portion 101 for housing the reel 20 around which the wire W used in the reinforcing bar binding machine 1A is wound.

[0045] The binding device 100A is configured such that the traveling portion 110 rides on the reinforcing bars S arranged in a lattice shape and the main body portion 101 moves, and the arrangement surface of the reinforcing bars S becomes a substantially horizontal surface.

[0046] The operation of the binding device 100A is briefly described. The binding device 100A is moved by the traveling unit 110 so that the reinforcing bar binding machine 1A is aligned with the cross section of the reinforcing bars S to be bound. Figure 1B The standby position shown moves to Figure 1A After reaching the bundling position shown, the reinforcing steel bar bundling machine 1A uses the wire W to bundle the reinforcing steel bars S.

[0047] When the reinforcing bar tying machine 1A finishes tying the reinforcing bar S, the tying machine moving unit 10A moves the reinforcing bar tying machine 1A from the tying position to the standby position. Then, the tying device 100A moves by the traveling unit 110 so that the reinforcing bar tying machine 1A is aligned with the intersection of the reinforcing bar S to be the next tying target.

[0048] Next, the configuration of each part of the bundling device 100A will be described. The bundling machine moving part 10A is an example of a bundling mechanism moving part, and includes a bundling machine mounting part 11 to which the reinforcing bar bundling machine 1A is mounted, and a driving part 12 that moves the bundling machine mounting part 11 in the up and down directions indicated by arrows C1 and C2. The driving part 12 includes a power source such as a motor and an actuator that can control the amount of movement, the direction of movement, and the speed of movement, and various mechanisms that convert the motion (output) of the power source into movement of the bundling machine mounting part 11 in the directions of arrows C1 and C2.

[0049] The tying machine moving unit 10A moves the reinforcing bar tying machine 1A mounted on the tying machine mounting unit 11 to the upward direction indicated by the arrow C1 by a predetermined amount, thereby moving the reinforcing bar tying machine 1A to the retreat position. In addition, the tying machine moving unit 10A moves the reinforcing bar tying machine 1A mounted on the tying machine mounting unit 11 to the downward direction indicated by the arrow C2 by a predetermined amount, thereby moving the reinforcing bar tying machine 1A from the retreat position to the tying position.

[0050] like Figure 1C As shown, the binding device 100A has a recessed portion in a shape into which a part or all of the reinforcing bar binding machine 1A and the binding machine moving part 10A enter on one side of the rectangular main body 101. In addition, the binding device 100A has a traveling part 110 on the lower surface of the main body 101.

[0051] The travel unit 110 includes an infinite track driven by a motor (not shown). The tying device 100A moves along the arrangement surface of the steel bars S by multiplying the infinite track constituting the travel unit 110 by the steel bars S arranged in a grid shape and rotating the infinite track. The travel unit 110 is provided on both sides of the left-right direction intersecting the moving direction of the main body 101.

[0052] The bundling device 100A is provided with a reel housing 200A on the upper surface of the main body 101. The reel housing 200A houses two reels 20 each of which winds one wire W so as to be pulled out, for one reinforcing bar bundling machine 1A that winds two wires W around reinforcing bars S to bundle them.

[0053] In the reel storage section 200A, two reels 20 are stored in a configuration arranged in a left-right direction intersecting with the moving direction (straight) of the main body 101 realized by the travel section 110 as shown by arrows A1 and A2. In this example, in the reel storage section 200A, the two reels 20 are arranged at left-right symmetrical positions with respect to an imaginary line extending in the moving direction of the main body 101 realized by the travel section 110. In detail, the two reels 20 are arranged at symmetrical positions with respect to an imaginary center line O1 passing through the center of the left-right direction orthogonal to the moving direction of the main body 101 and extending along the moving direction of the main body 101. Moreover, in the reel storage section 200A, the two reels 20 are arranged on the inner side of each of a pair of travel sections 110 provided on both sides of the left-right direction intersecting with the moving direction of the main body 101. In addition, in the reel housing portion 200A, the two reels 20 are rotatably housed in an arrangement where the two reels 20 are coaxially aligned along the axial direction with the axes of rotation being lateral to the vertical direction.

[0054] Figure 2 is a perspective view showing an example of a conveying path of a thread, Figure 3A and Figure 3B It is a perspective view showing an example of a path guiding member.

[0055] The binding device 100A includes a path guiding member 21 that forms a feeding path for the wire W at a plurality of locations between the reinforcing bar binding machine 1A and the reel housing portion 200A.

[0056] The path guiding member 21 is an example of a path guiding portion, is mounted on the main body 101 via a supporting member 22, and is provided at a plurality of locations along the conveying path of the wire W. In the tying device 100A, the conveying path of the wire W from the reel housing 200A to the reinforcing bar tying machine 1A is formed by the wire W passing through the annular path guiding member 21.

[0057] like Figure 3A As shown in FIG. 1 , the path guiding member 21 is composed of a combination of two annular members whose conveying paths of the two wires W are independent, and one wire W is passed through each annular member. Figure 3B As shown, the path guiding member 21 may be constituted by a single ring-shaped member in which the feeding paths of the two wires W are not independent, and the two wires W may be passed through the single ring-shaped member.

[0058] One of the plurality of path guiding members 21a gathers the wires W pulled out from the two reels 20. The path guiding member 21a between the path guiding member 21a for gathering the wires W pulled out from the two reels 20 and the reinforcing bar tying machine 1A guides the gathered two wires W in a parallel form toward the reinforcing bar tying machine 1A. In this example, the path guiding member 21 closest to the reel housing portion 200A constitutes the path guiding member 21a for gathering the wires W pulled out from the two reels 20.

[0059] On the reel 20, the wire W is wound in an overlapping manner in the radial direction while changing its position along the axial direction of the winding core portion (not shown) of the reel 20. Therefore, the position where the wire W is pulled out changes along the axial direction of the reel 20 due to the action of pulling the wire W out from the reel 20. In addition, the position where the wire W is pulled out changes along the radial direction of the reel 20 according to the amount of wire W used. Thus, the introduction direction of the wire W relative to the path guiding member 21a changes due to the action of pulling the wire W out from the reel 20. However, since the portion of the path guiding member 21a that the wire W contacts is a curved surface, the increase in resistance caused by frictional movement can be suppressed.

[0060] In addition, regarding other path guide members 21, since the portion for the wire W to contact is a curved surface, the increase in resistance due to frictional movement can be suppressed. Moreover, regarding the path guide member 21 at the portion close to the reinforcing bar tying machine 1A, the introduction direction of the wire W relative to the path guide member 21 changes due to the movement of the reinforcing bar tying machine 1A between the tying position and the standby position. However, since the portion of the path guide member 21 for the wire W to contact is a curved surface, the increase in resistance due to frictional movement can be suppressed, and the movement of the wire W to hinder the movement of the reinforcing bar tying machine 1A between the tying position and the standby position can be suppressed.

[0061] Figure 4A is a perspective view showing an example of a strapping device according to a second embodiment. Figure 4B This is a perspective view showing an example of a feeding path of a thread.

[0062] The binding device 100B of the second embodiment includes a reel storage unit 200B that stores a plurality of reels 20 (two reels 20 in this example). The binding device 100B of the second embodiment has the same structure as the binding device 100A of the first embodiment except for the reel storage unit 200B.

[0063] In the reel housing portion 200B, two reels 20 are housed in a configuration arranged in a left-right direction intersecting with the moving direction of the main body 101 by the travel portion 110. In this example, in the reel housing portion 200B, the two reels 20 are provided at the end sides of the left-right direction of the main body 101 at left-right symmetrical positions with respect to an imaginary line (not shown) extending in the moving direction of the main body 101 by the travel portion 110. In addition, in the reel housing portion 200B, the two reels 20 are housed rotatably in a direction intersecting with each other's axial directions with the axes of rotation being lateral to the vertical direction.

[0064] Figure 5A is a perspective view showing an example of a strapping device according to a third embodiment. Figure 5B This is a perspective view showing an example of a feeding path of a thread.

[0065] The binding device 100C of the third embodiment includes a reel storage unit 200C for storing a plurality of reels 20 (two reels 20 in this example). The binding device 100C of the third embodiment is similar to the binding device 100A of the first embodiment except for the reel storage unit 200C.

[0066] In the reel housing portion 200C, two reels 20 are housed in a configuration arranged in a left-right direction intersecting with the moving direction of the main body 101 by the travel portion 110. In this example, in the reel housing portion 200C, the two reels 20 are provided on one side of the left-right direction of the main body 101. In addition, in the reel housing portion 200C, the two reels 20 are rotatably housed in a configuration arranged coaxially along the axial direction with the axes of rotation being lateral to the vertical direction and with the axes of rotation being oriented in an inclined direction with respect to the moving direction of the main body 101.

[0067] Fig. 6A is a perspective view showing an example of a bundling device according to a fourth embodiment. Figure 6B This is a perspective view showing an example of a feeding path of a thread.

[0068] The bundling device 100D of the fourth embodiment includes a reel storage unit 200D for storing a plurality of reels 20 (two reels 20 in this example). The bundling device 100D of the fourth embodiment has the same structure as the bundling device 100A of the first embodiment except for the reel storage unit 200D.

[0069] In the reel housing section 200D, two reels 20 are housed in a configuration arranged in a left-right direction intersecting with the moving direction of the main body 101 realized by the travel section 110. In this example, in the reel housing section 200D, the two reels 20 are arranged at left-right symmetrical positions with respect to an imaginary line (not shown) extending in the moving direction of the main body 101 realized by the travel section 110. Moreover, in the reel housing section 200D, the two reels 20 are arranged on the inner side of each of a pair of travel sections 110 provided on both sides of the left-right direction intersecting with the moving direction of the main body 101. In addition, in the reel housing section 200D, the two reels 20 are housed rotatably with the axis of rotation being the longitudinal direction along the vertical direction.

[0070] Fig. 7A is a perspective view showing an example of a bundling device according to a fifth embodiment. Figure 7B This is a perspective view showing an example of a feeding path of a thread.

[0071] The bundling device 100E of the fifth embodiment includes a reel storage unit 200E that stores a plurality of reels 20 (two reels 20 in this example). The bundling device 100E of the fifth embodiment has the same structure as the bundling device 100A of the first embodiment except for the reel storage unit 200E.

[0072] In the reel housing portion 200E, two reels 20 are housed in a configuration arranged in a vertical direction intersecting with the moving direction of the main body 101 by the travel portion 110. In this example, in the reel housing portion 200E, the two reels 20 are provided inside a pair of travel portions 110 provided on both sides of the left-right direction intersecting with the moving direction of the main body 101. In addition, in the reel housing portion 200E, the two reels 20 are rotatably housed in a configuration coaxially overlapped along the axial direction with the axis of rotation being the longitudinal direction along the vertical direction.

[0073] <Structure example of reinforcing bar tying machine>

[0074] Figure 8 It is a side view of the main parts showing an example of the internal structure of the reinforcing bar binding machine according to the present embodiment.

[0075] The reinforcing bar bundling machine 1A is an example of a bundling mechanism, which feeds a wire W in the positive direction indicated by an arrow F, winds it around two intersecting reinforcing bars S as a bundling object, feeds the wire W wound around the reinforcing bars S in the reverse direction indicated by an arrow R, and after being tightly wound around the reinforcing bars S, twists the wire W, and bundles the reinforcing bars S using the wire W. The wire W may be a wire made of a plastically deformable metal wire, a wire in which a metal wire is coated with a resin, or a twisted wire.

[0076] In order to realize the above-mentioned functions, the reinforcing bar tying machine 1A includes a wire feeding unit 3 that feeds the wire W in the forward direction and the reverse direction, and a wire guide 4 that guides the wire W fed by the wire feeding unit 3. In addition, the reinforcing bar tying machine 1A includes a curling unit 5 that forms a path for winding the wire W fed by the wire feeding unit 3 around the reinforcing bar S, and a cutting unit 6 that cuts the wire W wound around the reinforcing bar S. Furthermore, the reinforcing bar tying machine 1A includes a tying unit 7 that twists the wire W wound around the reinforcing bar S, and a driving unit 8 that drives the tying unit 7.

[0077] When the reinforcing bar binding machine 1A is used in the binding devices 100A, 100B, 100C, 100D, 100E, and the binding device 100F described later, the curl forming portion 5 is used downward. Hereinafter, in the reinforcing bar binding machine 1A used in the binding devices 100A, 100B, 100C, 100D, 100E, and 100F, the side where the curl forming portion 5 is provided is referred to as the lower side.

[0078] The wire conveying unit 3 includes a pair of conveying gears 30 for clamping and conveying one or a plurality of wires W in parallel. The pair of conveying gears 30 of the wire conveying unit 3 are forced toward each other, and the conveying gears 30 are rotated by receiving the rotation of the conveying motor (not shown). Thus, the wire conveying unit 3 conveys the wire W clamped between the pair of conveying gears 30 along the extending direction of the wire W. In a structure for conveying a plurality of wires W, for example, two wires W, the two wires W are conveyed in a parallel state.

[0079] The wire guide 4 is provided at a predetermined position on the upstream side and the downstream side of the wire feeding section 3 with respect to the feeding direction of the wire W in the positive direction indicated by the arrow F. Figure 8 In the figure, the wire guide 4 provided on the upstream side of the wire feeding unit 3 is not shown.

[0080] The wire guide 4 is provided with an opening extending in the conveying direction of the wire W, and the opening area of ​​the opening on the downstream side is configured to be smaller than the opening on the upstream side in the conveying direction along the positive direction of the wire W. For example, the wire guide 4 is configured with a tapered opening whose opening area is the largest on the introduction side of the wire W conveyed in the positive direction and whose opening area gradually decreases therefrom. Thus, the wire guide 4 guides the wire W conveyed in the positive direction and passing through the wire guide 4 to between the pair of conveying gears 30 and the cutting unit 6.

[0081] In the structure of the reinforcing steel bar bundling machine 1A using two wires W to bundle reinforcing steel bars S, the wire guide 4 is shaped such that the opening on the downstream side along the conveying direction of the positive direction of the wires W restricts the radial direction of the two wires W. Thus, the wire guide 4 allows the two wires W conveyed in the positive direction and passing through the wire guide 4 to be arranged in parallel along the direction in which the pair of conveying gears 30 are arranged, and guides them to between the pair of conveying gears 30 and to the cutting section 6. It should be noted that Figure 1A The path guiding member 21 closest to the reinforcing bar tying machine 1A shown in the figure guides the two wires W toward the wire guide 4 .

[0082] The curl forming unit 5 includes a curl guide 50 that imparts a curling tendency to the wire W fed by the wire feeding unit 3 , and a guide 51 that guides the wire W imparted with a curling tendency by the curl guide 50 toward the bundling unit 7 .

[0083] In the reinforcing bar tying machine 1A, the conveying path of the wire W conveyed by the wire conveying unit 3 is restricted by the curl forming unit 5, so that the trajectory of the wire W becomes as follows: Figure 8 In the ring Ru shown by the dotted line, the wire W is wound around the steel bar S.

[0084] The curling forming section 5 includes a guide member 53a and a guide member 53b for guiding the wire W fed in the positive direction and imparting a winding tendency to the wire W. The guide member 53a is provided on the introduction side of the wire W fed by the wire feeding section 3 in the curling guide 50, and is arranged on the radial inner side of the loop Ru formed by the wire W fed by the wire feeding section 3. The guide member 53b is provided on the discharge side of the wire W fed by the wire feeding section 3 in the curling guide 50, and is arranged on the radial outer side of the loop Ru formed by the wire W.

[0085] The curl forming unit 5 includes a guide member moving mechanism 54 for retracting the guide member 53a. After the wire W is wound around the reinforcing bar S, the guide member moving mechanism 54 retracts the guide member 53a in conjunction with the operation of the binding unit 7.

[0086] The cutting unit 6 includes a fixed blade 60, a movable blade 61 that cuts the thread W by cooperating with the fixed blade 60, and a transmission mechanism 62 that transmits the action of the bundling unit 7 to the movable blade 61. The cutting unit 6 cuts the thread W by the rotation of the movable blade 61 about the fixed blade 60 as a fulcrum. The transmission mechanism 62 transmits the action of the bundling unit 7 to the movable blade 61 via the transmission member 75, rotates the movable blade 61 in conjunction with the action of the bundling unit 7, and cuts the thread W.

[0087] The binding unit 7 includes a wire locking body 70 for locking the wire W and a sleeve 71 for operating the wire locking body 70. The detailed structure of the binding unit 7 will be described later. The driving unit 8 includes a motor 80 and a speed reducer 81 for reducing speed and amplifying torque.

[0088] When the reinforcing bar tying machine 1A is used as a reinforcing bar tying machine in a form of a hand-held use by an operator, the reinforcing bar tying machine 1A has a handle portion 16 in a shape that can be held by an operator, and a battery 17 is detachably mounted on the handle portion 16. The tying device 100A is equipped with the handle portion 16 of the reinforcing bar tying machine 1A on the tying machine mounting portion 11 of the tying machine moving portion 10A. It should be noted that the reinforcing bar tying machine 1A may also be a structure that receives power supply from the tying devices 100A, 100B, 100C, 100D, 100E, and 100F.

[0089] The reinforcing bar tying machine 1A includes a conveyance regulating section 90 against which the tip of the wire W abuts, in a conveyance path of the wire W that is conveyed in the forward direction by the wire conveying section 3 , passes through the curl forming section 5 , and is wound around the reinforcing bar S.

[0090] The reinforcing bar tying machine 1A includes a contact portion 91 (see FIG. 1 ) between the curling guide 50 and the guiding guide 51, against which the reinforcing bar S inserted between the curling guide 50 and the guiding guide 51 contacts. Figure 1D ).

[0091] When the reinforcing bar tying machine 1A mounted on the tying device 100A moves to the tying position by the operation of the tying machine moving part 10A, the reinforcing bar S is inserted between the curling guide 50 and the guiding guide 51 , and the reinforcing bar S inserted between the curling guide 50 and the guiding guide 51 collides with the abutment part 91 .

[0092] <Configuration Example of Bundling Section>

[0093] Fig. 9A and Fig. 9B 1 is a cross-sectional plan view showing an example of a bundling portion. Next, the structure of the bundling portion will be described with reference to each figure.

[0094] The binding unit 7 includes a rotating shaft 72 for operating the thread locking body 70 and the sleeve 71. In the binding unit 7 and the driving unit 8, the rotating shaft 72 and the motor 80 are connected via a speed reducer 81, and the rotating shaft 72 is driven by the motor 80 via the speed reducer 81.

[0095] The thread locking body 70 includes a central hook 70C connected to the rotation shaft 72, and a first side hook 70R and a second side hook 70L that open and close relative to the central hook 70C.

[0096] The center hook 70C is connected to one end portion of the rotating shaft 72 along the axial direction, that is, the tip of the rotating shaft 72 , via a structure that is rotatable relative to the rotating shaft 72 and movable in the axial direction integrally with the rotating shaft 72 .

[0097] In the thread retaining body 70, the tip of the first side hook 70R opens and closes in the direction of approaching and moving away from the center hook 70C by the rotation operation around the shaft 71b. In addition, the tip of the second side hook 70L opens and closes in the direction of approaching and moving away from the center hook 70C.

[0098] The sleeve 71 has a protruding convex portion (not shown) on the inner circumferential surface of the space in which the rotating shaft 72 is inserted, and the convex portion enters the groove portion of the feed screw 72a formed along the axial direction on the outer circumference of the rotating shaft 72. When the rotating shaft 72 rotates, the sleeve 71 moves in the axial direction of the rotating shaft 72, that is, in the up-down direction, according to the rotation direction of the rotating shaft 72 by 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.

[0099] The sleeve 71 includes an opening and closing pin 71 a for opening and closing the first side hook 70R and the second side hook 70L.

[0100] The opening and closing pin 71a is inserted into the opening and closing guide hole 73 provided in the first side hook 70R and the second side hook 70L. The opening and closing guide hole 73 extends along the moving direction of the sleeve 71, and has a shape that converts the linear movement of the opening and closing pin 71a that moves in conjunction with the sleeve 71 into an opening and closing action based on the rotation of the first side hook 70R and the second side hook 70L with the shaft 71b as a fulcrum.

[0101] In the wire retaining body 70, the sleeve 71 moves in the upward direction indicated by the arrow D2. According to the trajectory of the opening and closing pin 71a and the shape of the opening and closing guide hole 73, the first side hook 70R and the second side hook 70L move in the direction away from the central hook 70C by rotating around the shaft 71b as a fulcrum.

[0102] Thus, the first side hook 70R and the second side hook 70L are opened relative to the central hook 70C, and a feeding path for the thread W to pass is formed between the first side hook 70R and the central hook 70C and between the second side hook 70L and the central hook 70C.

[0103] In a state where the first side hook 70R and the second side hook 70L are opened relative to the central hook 70C, the thread W fed by the thread feeding unit 3 passes between the central hook 70C and the first side hook 70R. The thread W passing between the central hook 70C and the first side hook 70R is guided toward the curl forming unit 5. Furthermore, the thread W given a winding tendency by the curl forming unit 5 and guided to the bundling unit 7 passes between the central hook 70C and the second side hook 70L.

[0104] In the thread retaining body 70, the sleeve 71 moves downwardly as indicated by the arrow D1, and the first side hook 70R and the second side hook 70L move toward the direction approaching the central hook 70C by rotating the shaft 71b as a fulcrum according to the trajectory of the opening and closing pin 71a and the shape of the opening and closing guide hole 73. As a result, the first side hook 70R and the second side hook 70L are closed relative to the central hook 70C.

[0105] When the first side hook 70R is closed relative to the central hook 70C, the thread W sandwiched between the first side hook 70R and the central hook 70C is locked in a state where it can move between the first side hook 70R and the central hook 70C. In addition, when the second side hook 70L is closed relative to the central hook 70C, the thread W sandwiched between the second side hook 70L and the central hook 70C is locked in a state where it does not slip out from between the second side hook 70L and the central hook 70C.

[0106] The sleeve 71 includes a bending portion 71c1 for forming the wire W into a specified shape by pressing and bending one end portion, i.e., the top end side, in a specified direction, and a bending portion 71c2 for forming the wire W into a specified shape by pressing and bending the other end portion, i.e., the terminal end side, of the wire W cut by the cutting portion 6.

[0107] The sleeve 71 moves in the downward direction indicated by the arrow D1, and the top end side of the wire W clamped by the central hook 70C and the second side hook 70L is pressed by the bending portion 71c1 and bent toward the steel bar S. In addition, the sleeve 71 moves in the downward direction indicated by the arrow D1, and the end side of the wire W clamped by the central hook 70C and the first side hook 70R and cut by the cutting portion 6 is pressed by the bending portion 71c2 and bent toward the steel bar S.

[0108] The bundling portion 7 includes a rotation limiting portion 74 that limits the rotation of the thread retaining body 70 and the sleeve 71 that are linked to the rotation of the rotating shaft 72. In the bundling portion 7, the rotation limiting portion 74 limits the rotation of the sleeve 71 that is linked to the rotation of the rotating shaft 72 according to the position of the sleeve 71 along the axial direction of the rotating shaft 72, and the sleeve 71 moves in the arrow D1 direction and the arrow D2 direction by the rotation of the rotating shaft 72.

[0109] Thus, the sleeve 71 is moved in the direction of arrow D1 without rotation, and the first side hook 70R and the second side hook 70L are closed relative to the central hook 70C, and the thread W is locked. In addition, the sleeve 71 is moved in the direction of arrow D2 without rotation, and the first side hook 70R and the second side hook 70L are opened relative to the central hook 70C, and the locking of the thread W is released.

[0110] In the bundling portion 7 , when the restriction on the rotation of the sleeve 71 by the rotation restriction portion 74 is released, the sleeve 71 rotates in conjunction with the rotation of the rotation shaft 72 .

[0111] As a result, the first side hook 70R, the second side hook 70L, and the central hook 70C that have locked the wire W rotate, and the locked wire W is twisted.

[0112] <Example of the Effect of the Bundling Device of the Present Embodiment>

[0113] The reinforcing bar tying machine 1A is configured to feed two wires W around the intersection of the reinforcing bars S, feed the two wires W fed around the reinforcing bars S in the reverse direction to be tightly wound around the reinforcing bars S, and twist the wires W to tie the reinforcing bars S. Therefore, in the tying devices 100A, 100B, 100C, 100D, and 100E, the two wires W are fed between the reel housing portions 200A, 200B, 200C, 200D, and 200E and the reinforcing bar tying machine 1A.

[0114] In the bundling devices 100A, 100B, 100C, 100D, and 100E, two reels 20 are stored in the reel storage parts 200A, 200B, 200C, 200D, and 200E in accordance with the number of wires W used in the reinforcing bar bundling machine 1A, and one wire W is wound around each reel 20. Thus, it is possible to suppress the two wires W from being entangled in the reel 20 due to the two wires W being wound around one reel 20. Thus, in the structure in which the main body 101 travels using the travel unit 110, it is possible to suppress the two wires W from being entangled in the reel 20 due to vibration during travel.

[0115] In this way, by adopting a structure in which one wire W is wound around one reel 20, there is no need to consider the occurrence of a large difference in winding tendency among a plurality of wires, and the management cost of manufacturing the reel wound with the wires can be reduced and the yield can be improved.

[0116] In addition, since abnormal deformation of the wire W caused by winding two wires W around one reel 20 can be eliminated, it is easy to manage the conveying path of the wire W from the reel 20 outside the reinforcing bar tying machine 1A to the reinforcing bar tying machine 1A. In addition, factors that affect the winding trajectory of the wire W when the wire W is wound around the reinforcing bar S by the reinforcing bar tying machine 1A can be eliminated.

[0117] Therefore, it is possible to suppress the occurrence of poor pulling out of the wire W from the reel 20 and poor feeding on the feeding path.

[0118] In the reel housing section 200A, the two reels 20 are provided at symmetrical positions with respect to an imaginary center line O1 passing through the center in the left-right direction orthogonal to the moving direction of the main body 101 indicated by arrows A1 and A2 and extending along the moving direction of the main body 101 .

[0119] The reel 20 wound with the wire W is a relatively heavy member in the bundling device 100A. In the bundling device 100A, the reel 20 is provided at a symmetrical position with respect to the imaginary center line O1, so that the imbalance of the weight balance in the left-right direction orthogonal to the moving direction of the main body 101 can be suppressed. In addition, in the bundling device 100A, when the wire W is used by the bundling operation of the reinforcing steel bar S in the reinforcing steel bar bundling machine 1A, and the amount of the wire W wound on the reel 20 is reduced, the amount of the wire W wound on the two reels 20 is substantially the same. Thus, even when the amount of the wire W wound on the reel 20 is reduced, the imbalance of the weight balance in the left-right direction orthogonal to the moving direction of the main body 101 can be suppressed.

[0120] In the strapping device 100A, the traveling parts 110 are provided on both sides of the left-right direction intersecting the moving direction of the main body 101. By suppressing the imbalance of the weight balance of the main body 101 in the left-right direction, the main body 101 can be suppressed from tilting. In addition, in the reel storage part 200A, two reels 20 are provided on the inner side of each of the pair of traveling parts 110. Thus, the two reels 20, which are relatively heavy in the state of being wound with the wire W, can be concentrated near the center of the strapping device 100A in the left-right direction.

[0121] It should be noted that in the binding device 100A, the reinforcing steel bar binding machine 1A is configured so that Fig. 9A , Fig. 9B The rotating shaft 72 of the reinforcing steel bar tying machine 1A shown in the figure is located in a direction extending in the vertical direction. Figure 1C The two reels 20 are mounted on the main body 101 in a manner extending along the extension of the imaginary center line O1 shown. Thus, in the binding device 100A, the two reels 20 are provided at symmetrical positions with respect to an imaginary line (not shown) extending from the rotation axis 72 of the reinforcing bar binding machine 1A.

[0122] The reinforcing bar binding machine 1A is a relatively heavy member in the binding device 100A. In the binding device 100A, the reinforcing bar binding machine 1A is arranged so that the rotation axis 72 is located on the extension line of the imaginary center line O1, so that the weight balance in the left-right direction orthogonal to the moving direction of the main body 101 can be suppressed from being unbalanced.

[0123] In addition, in the bundling device 100A, by setting the two reels 20 at symmetrical positions relative to the rotating shaft 72 of the steel bar bundling machine 1A and setting the two reels 20 on the inner side of each of the pair of traveling parts 110, the heavy objects can be concentrated near the center in the left-right direction of the bundling device 100A, and the imbalance of the weight balance in the left-right direction orthogonal to the moving direction of the main body 101 can be suppressed.

[0124] On the other hand, Figure 1C A top view of Figure 1D As shown in the front view, the conveying path of the wire W from the reel housing 200A to the rebar tying machine 1A deviates in one direction relative to the imaginary center line O1, and the path inducing member 21a closest to the reel housing 200A is arranged at a position deviated in one direction relative to the imaginary center line O1.

[0125] Therefore, the path length L1 of the wire W from the reel 20 (1) on one side to the path guiding member 21a is different from the path length L2 of the wire W from the reel 20 (2) on the other side to the path guiding member 21a, and a difference is generated between the path length from the reel 20 (1) on one side to the steel bar bundling machine 1A and the path length from the reel 20 (2) on the other side to the steel bar bundling machine 1A.

[0126] In the operation of bundling the reinforcing bars S using two wires W, wires W of substantially the same length are pulled out from the two reels 20, respectively. Therefore, if there is a difference between the path length from the reel 20 (1) on one side to the reinforcing bar bundling machine 1A and the path length from the reel 20 (2) on the other side to the reinforcing bar bundling machine 1A, for example, the wires W pulled out from the reel 20 (1) on the side with the longer path length may be used up first. In such a case, if the length of the wires W remaining on the reel 20 (2) on the other side is longer than the length of the wires W required for bundling the reinforcing bars S once, when both reels 20 are replaced at the same time, the wires W will be replaced even though the wires W required for bundling the reinforcing bars S still remain on the reel 20 (2) on the other side, thereby causing a waste of the wires W.

[0127] Therefore, the difference between the path length from one reel 20 ( 1 ) to the reinforcing bar tying machine 1A and the path length from the other reel 20 ( 2 ) to the reinforcing bar tying machine 1A is set shorter than the length of the wire W required for tying the reinforcing bars S once.

[0128] Therefore, when the wire W pulled out from one reel 20 (1) runs out first due to the action of bundling the steel bars S using two wires W, for example, the wire W remaining on the other reel 20 (2) is shorter than the length of the wire W required for one bundling of the steel bars S. Even if both reels 20 are replaced at the same time, waste of the wire W can be suppressed.

[0129] In addition, the difference between the path length from the reel 20 (1) on one side to the rebar tying machine 1A and the path length from the reel 20 (2) on the other side to the rebar tying machine 1A can also be set to be smaller than the circumferential length of the unillustrated winding core portion of the reel 20 (that is, when the diameter of the unillustrated winding core portion of the reel 20 is set to D, the length is D×3.14).

[0130] If the difference between the path length from the reel 20 (1) on one side to the reinforcing bar binding machine 1A and the path length from the reel 20 (2) on the other side to the reinforcing bar binding machine 1A is large, the difference in the amount of the wire W pulled out from each reel 20 to the reinforcing bar binding machine 1A becomes large, and thus the difference in the remaining amount of the wire W wound on each reel 20 becomes large. If the difference in the remaining amount of the wire W wound on each reel 20 becomes large, the positions where the wire W is pulled out in the radial direction of the reel 20 are different, and the difference in the mass of the reel 20 including the wire W becomes large, so it is not easy to feed the two wires W in parallel. In addition, in the operation of feeding the wire W in the forward direction by the reinforcing bar binding machine 1A and giving the wire W a winding tendency by the curl forming unit 5 to be wound around the reinforcing bar S, the curling trajectory of the wire W may be unstable.

[0131] On the other hand, by setting the difference between the path length from the one reel 20 (1) to the reinforcing bar binding machine 1A and the path length from the other reel 20 (2) to the reinforcing bar binding machine 1A shorter than the length of the wire W required for one binding of the reinforcing bars S, the difference between the path length from the one reel 20 (1) to the reinforcing bar binding machine 1A and the path length from the other reel 20 (2) to the reinforcing bar binding machine 1A can be reduced. In addition, by setting the difference between the path length from the one reel 20 (1) to the reinforcing bar binding machine 1A and the path length from the other reel 20 (2) to the reinforcing bar binding machine 1A shorter than the circumferential length of the winding core portion (not shown) of the reel 20, the difference between the path length from the one reel 20 (1) to the reinforcing bar binding machine 1A and the path length from the other reel 20 (2) to the reinforcing bar binding machine 1A can also be reduced.

[0132] By reducing the difference between the path length from the reel 20 (1) on one side to the reinforcing bar tying machine 1A and the path length from the reel 20 (2) on the other side to the reinforcing bar tying machine 1A, the difference in the remaining amount of the wire W wound on each reel 20 becomes smaller, the position where the wire W is pulled out in the radial direction of the reel 20 becomes approximately the same, and the difference in the mass of the reel 20 including the wire W becomes smaller. As a result, the path of the wire W between the two wires W is stabilized, and the management of the conveying path of the wire W from the reel 20 outside the reinforcing bar tying machine 1A to the reinforcing bar tying machine 1A becomes easy. In addition, it is possible to eliminate the factors that affect the winding trajectory of the wire W when the wire W is wound around the reinforcing bar S by the reinforcing bar tying machine 1A.

[0133] exist Figure 4A , Figure 4B In the strapping device 100B shown in the figure, the two reels 20 (1) and 20 (2) are arranged at left-right symmetrical positions with respect to the moving direction of the main body 101 by the travel unit 110 in the reel storage unit 200B. Fig. 6A , Figure 6B In the strapping device 100D shown, the two reels 20(1) and 20(2) are also provided at left-right symmetrical positions in the reel storage section 200D with respect to the moving direction of the main body 101 by the travel section 110. Thus, regardless of the direction of the rotation axis of the reels 20, it is possible to suppress the imbalance of the weight balance in the left-right direction of the main body 101 in the same manner as the strapping device 100A.

[0134] Moreover, in Fig. 7A , Figure 7B In the strapping device 100E shown, by orienting the rotation axis of the reel 20 in the longitudinal direction, the reel storage unit 200E can arrange the two reels 20 (1) and 20 (2) in an overlapping manner on or near the imaginary center line O1 shown in FIG1. ​​Thus, the heavy object can be concentrated near the center in the left-right direction of the strapping device 100E, and the imbalance of the weight balance in the left-right direction orthogonal to the moving direction of the main body 101 can be suppressed.

[0135] In each of the above-mentioned tying devices 100A, 100B, 100C, 100D, and 100E, a conveying path of the wire W from the reel housing 200A, 200B, 200C, 200D, and 200E to the reinforcing bar tying machine 1A is formed by passing the wire W through the annular path guiding member 21 (21a). The path of the wire W has a straight portion and a portion where the wire W is bent by the path guiding member 21 (21a).

[0136] As described above, if there is a portion where the wire W is bent by the path guiding member 21 (21a) in the feeding path of the wire W, the wire W will have a so-called bending tendency in which the wire W does not become a straight line but becomes a bent state.

[0137] Therefore, if there is a difference between the conveying paths of the two wires W in the angle at which the wires W are bent by the path guiding member 21 (21a) and the direction in which the wires W are bent by the path guiding member 21 (21a), it is difficult to convey the two wires W in parallel due to the difference in the bending angle and bending direction of the two wires W due to the winding tendency of the belt when passing through the path guiding member 21 (21a). In addition, in the operation of conveying the wires W in the forward direction by the steel bar tying machine 1A and giving the wires W a winding tendency by the curl forming unit 5 to be wound around the steel bar S, the curling trajectory of the wires W may be unstable.

[0138] In contrast, Figure 5A , Figure 5B The bundling device 100C shown can arrange the reels 20 (1) and 20 (2) in symmetrical positions with respect to an imaginary line (not shown) drawn from the path guide member 21a closest to the reel housing 200C. As a result, the difference in the angle of the wire W bent by the path guide member 21a and the direction of the wire W bent by the path guide member 21a can be reduced between the wire W drawn from the reel 20 (1) on one side and passing through the path guide member 21a and the wire W drawn from the reel 20 (2) on the other side and passing through the path guide member 21a. Therefore, the path of the wire W between the two wires W is stabilized, and the management of the conveying path of the wire W from the reel 20 outside the reinforcing bar bundling machine 1A to the reinforcing bar bundling machine 1A becomes easy. In addition, the factors that affect the winding trajectory of the wire W when the wire W is wound around the reinforcing bar S by the reinforcing bar bundling machine 1A can be eliminated.

[0139] Moreover, the bundling device 100C can reduce the difference between the path length of the wire W from the reel 20 (1) on one side to the path guiding member 21a and the path length of the wire W from the reel 20 (2) on the other side to the path guiding member 21a, and can reduce the difference between the path length from the reel 20 (1) on one side to the steel bar bundling machine 1A and the path length from the reel 20 (2) on the other side to the steel bar bundling machine 1A.

[0140] <Configuration Example of Bundling Device According to Other Embodiments>

[0141] Fig. 10A is a perspective view showing an example of a strapping device according to another embodiment. Fig. 10B is a plan view showing an example of a strapping device according to another embodiment. Fig. 10C This is a front view showing an example of a bundling device according to another embodiment.

[0142] A bundling device 100F according to another embodiment includes, in a main body 101, a plurality of reinforcing bar bundling machines 1A for bundling intersections of reinforcing bars S arranged in a lattice pattern with wires W, and a plurality of bundling machine moving parts 10A for moving each reinforcing bar bundling machine 1A between a bundling position and a retreat position in a substantially vertical direction intersecting a surface on which the reinforcing bars S are arranged.

[0143] The binding device 100F also includes a reel housing portion 200F in the main body portion 101 for housing the reel 20 around which the wire W used in each reinforcing bar binding machine 1A is wound.

[0144] The bundling device 100F is provided with a reel storage part 200F on the upper surface of the main body 101. The reel storage part 200F stores two reels 20 each of which is wound so as to be pulled out, for one rebar bundling machine 1A that winds two wires W around the rebar S to bundle them, and stores four reels 20 for two rebar bundling machines 1A.

[0145] In the reel storage section 200F, two reels 20 corresponding to one rebar tying machine 1A are stored in a configuration arranged in a left-right direction intersecting with the moving direction (straight) of the main body 101 realized by the traveling section 110 as indicated by arrows A1 and A2. In addition, in the reel storage section 200F, each of the two reels 20 corresponding to one rebar tying machine 1A is provided at a left-right symmetrical position with respect to the moving direction of the main body 101 realized by the traveling section 110. In detail, each of the two reels 20 is provided at a symmetrical position with respect to an imaginary center line O1 passing through the center of the main body 101 in the left-right direction orthogonal to the moving direction of the main body 101 and extending along the moving direction of the main body 101. Moreover, in the reel storage section 200F, each of the two reels 20 is provided on the inner side of each of a pair of traveling sections 110 provided on both sides of the left-right direction intersecting with the moving direction of the main body 101. In addition, in the reel housing portion 200F, two reels 20 are rotatably housed in an arrangement where the reels 20 are coaxially aligned along the axial direction with the axes of rotation being lateral to the vertical direction.

[0146] It should be noted that the arrangement of the reels 20 in the reel storage section 200F is not limited to these examples. For example, the arrangement may be as follows as shown in FIG. 4: the two reels 20 are arranged so that the axes of rotation are transverse to the vertical direction and the reels 20 are rotatably stored in a direction that crosses each other's axial directions. Figure 5A As shown in the figure, the two reels 20 are arranged so that the axis of rotation is horizontal relative to the vertical direction and the axis of rotation is inclined relative to the moving direction of the main body 101, and are arranged coaxially along the axial direction so that they can be rotatably accommodated. Fig. 6AAs shown in the figure, the arrangement is as follows: the two reels 20 are arranged so that the axis of rotation is longitudinally along the vertical direction, and are arranged in the left-right direction relative to the moving direction of the main body 101. Fig. 7A As shown, the following arrangement may be adopted: the two reels 20 are stacked up and down and stored with the rotation axis along the vertical direction. Thus, the bundling device 100F can obtain the same effects as the bundling devices 100A, 100B, 100C, 100D, and 100E.

[0147] This application is based on the Japanese patent application (Japanese Patent Application No. 2022-106763) filed on July 1, 2022, the contents of which are incorporated herein by reference.

[0148] Industrial Applicability

[0149] The bundling device disclosed herein can provide a bundling device suitable for bundling steel bars with a plurality of wires.

[0150] Description of Reference Numerals

[0151] 100A, 100B, 100C, 100D, 100E, 100F strapping device

[0152] 101 Main body

[0153] 110 Traveling parts

[0154] 200A, 200B, 200C, 200D, 200E Reel storage unit

[0155] 1A Steel bar tying machine (tying mechanism)

[0156] 10A strapping machine moving part

[0157] 20 Scrolls

[0158] 21.21a Path Guidance Component

[0159] 22 Supporting member

[0160] W Silk thread.

Claims

1. A strapping device comprising a main body and a traveling portion for traveling the main body, The main body has: The bundling mechanism transports a plurality of wires around the steel bars and twists the plurality of wires transported around the steel bars to bundle them; A bundling mechanism moving unit moves the bundling mechanism between a bundling position for bundling the steel bars and a retreat position away from the steel bars; a reel storage unit for storing a plurality of reels on which one silk thread is wound; and The path guiding portion forms a conveying path for the wires pulled out from the plurality of reels accommodated in the reel accommodation portion between the bundling mechanism and the reel accommodation portion.

2. The strapping device according to claim 1, The plurality of reels are housed in the reel housing portion in a configuration aligned left and right with respect to a moving direction of the main body portion by the traveling portion.

3. The strapping device according to claim 1, The plurality of reels are housed in the reel housing portion in a bilaterally symmetrical arrangement with respect to a moving direction of the main body portion by the traveling portion.

4. The strapping device according to claim 1, The plurality of reels are housed in the reel housing portion in an overlapping arrangement with the axes of rotation thereof being arranged in the longitudinal direction.

5. The strapping device according to claim 1, The bundling mechanism includes a bundling part that twists the wire by a rotational motion. In the reel storage section, the plurality of reels are stored in a symmetrical arrangement with respect to a virtual line passing through a rotation axis of a rotational operation of the bundling section.

6. The strapping device according to claim 1, The path guiding section includes path guiding members for forming a feeding path for the thread at a plurality of locations between the bundling mechanism and the reel storage section. One of the plurality of path guiding members gathers the threads drawn out from the plurality of reels.

7. The strapping device according to claim 6, In the reel housing portion, the plurality of reels are housed in a symmetrical arrangement with respect to an imaginary line extending from a path guide member closest to the reel housing portion among the plurality of path guide members.

8. The strapping device according to claim 1, In the reel storage portion, the difference between the path length of the wire conveying path from one of the reels to the bundling mechanism and the path length of the wire conveying path from the other reels to the bundling mechanism is set to be shorter than the length of the wire required for the bundling mechanism to bundle the steel bars once.

9. The strapping device according to claim 1, In the reel storage portion, the difference between the path length of the wire conveying path from one of the reels to the bundling mechanism and the path length of the wire conveying path from the other reel to the bundling mechanism is set to be smaller than the circumferential length of the winding core portion of the reel on which the wire is wound.

10. The strapping device according to claim 4, The plurality of reels are housed in the reel housing portion in an arrangement where the reels are stacked up one above the other.

11. The strapping device according to claim 5, In the reel storage section, the plurality of reels are stored in a bilaterally symmetrical arrangement with respect to a virtual line passing through a rotation axis of the rotational operation of the bundling section.

12. The strapping device according to claim 5, A central imaginary line in the left-right direction of the main body with reference to the moving direction of the main body intersects an imaginary line extending in the direction of the rotation axis of the rotational operation of the binding unit.

13. The strapping device according to claim 1, A central imaginary line in the left-right direction of the main body portion based on the moving direction of the main body portion does not pass through the path guiding portion.

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