Reinforcement bender and reinforcement bending method

Abstract

To efficiently ship a bent reinforcement.SOLUTION: A processor 31 controls a first bending unit 11 including a first support member 14 capable of switching a support state of supporting a reinforcement 80 and a release state of releasing the support of the reinforcement 80 to bend one end side of the reinforcement 80, controls a second bending unit 22 including a second support member 24 capable of switching the support state and the release state to bend the other end side of the reinforcement 80, then, moves the first bending unit 11 to the right while controlling the second support member 24 to the support state and controlling the first support member 14 to the release state, and then, moves the first bending unit 11 to the right while controlling the second support member 24 to the release state and controlling the first support member 14 to the support state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a rebar bending machine and a rebar bending method. [Background technology]

[0002] Patent Document 1 describes a bending machine including a device for feeding a bar-shaped profile material to a bending position and removing the bar-shaped profile material after bending. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] European Patent No. 3031543 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology disclosed herein aims to efficiently transport bent reinforcing bars. [Means for solving the problem]

[0005] One aspect of the technology of the present disclosure is as follows. [1] a first bending unit that bends one end of the reinforcing bar; A second bending unit that bends the other end of the reinforcing bar; a processor, The first bending unit and the second bending unit are arranged side by side in the axial direction of the reinforcing bar and are configured to be relatively movable in the axial direction, The first bending unit has a first support member that can switch between a support state in which the reinforcing bar is supported and an open state in which the support of the reinforcing bar is released, The second bending unit has a second support member that can switch between a support state in which the reinforcing bar is supported and an open state in which the support of the reinforcing bar is released, The processor: A first process of controlling the first bending unit to bend one end side of the reinforcing bar; A second process of controlling the second bending unit to bend the other end of the reinforcing bar; a third process of moving the first bending unit and the second bending unit relative to each other while controlling the second support member to be in a supporting state and controlling the first support member to be in an open state after the first process and the second process; A rebar bending machine that performs a fourth process after the first process and the second process, in which the first bending unit and the second bending unit are moved relative to each other while controlling the second support member to an open state and controlling the first support member to a supported state.

[0006] [2] The reinforcing bar bending machine according to [1], the first bending unit and the second bending unit each have a fulcrum member, In the first process and the second process, the end of the reinforcing bar is bent until it reaches a bending angle at which it is folded back, The fulcrum member is a reinforcing bar bending machine having a guide portion that guides the relative movement between the fulcrum member and the reinforcing bar when the relative movement occurs between the fulcrum member and the reinforcing bar during the third process and the fourth process.

[0007] [3] [2] The reinforcing bar bending machine according to The guide portion is a reinforcing bar bending machine configured by a flat surface facing the end of the reinforcing bar folded back by the first processing and the second processing.

[0008] [4] [1] to [3], the reinforcing bar bending machine according to any one of [1] to [3], In the third and fourth processes, the first bending unit and the second bending unit are moved relatively to each other so that they approach each other.

[0009] [5] [4] The reinforcing bar bending machine according to The processor controls the rebar bending machine to move the first bending processing unit closer to the second bending processing unit in each of the third process and the fourth process.

[0010] [6] [1] to [4] The reinforcing bar bending machine according to any one of [1] to [4], A carrying-out unit is provided between the first bending unit and the second bending unit, and carries out the bent reinforcing bar, The carrying-out unit is a rebar bending machine that lifts and carries out the rebar at an angle to an installation surface on which the rebar bending machine is installed.

[0011] [7] [6] The reinforcing bar bending machine according to The carrying-out unit is a rebar bending machine that further supplies rebars from a waiting section where the rebars are waiting to the first bending unit and the second bending unit.

[0012] [8] a first process for bending one end of the reinforcing bar by controlling a first bending unit including a first support member that can switch between a support state in which the reinforcing bar is supported and an open state in which the support of the reinforcing bar is released; a second process of bending the other end of the reinforcing bar by controlling a second bending unit including a second support member that can switch between a support state that supports the reinforcing bar and an open state that releases support for the reinforcing bar; After the first process and the second process, a third process is performed in which the first bending unit and the second bending unit are moved relatively in the axial direction of the reinforcing bar while the second support member is controlled to be in a supported state and the first support member is controlled to be in an open state. A rebar bending method comprising: after the first process and the second process, performing a fourth process in which the second support member is controlled to an open state and the first support member is controlled to a supported state, and the first bending processing unit and the second bending processing unit are moved relative to each other in the axial direction. [Effects of the Invention]

[0013] According to the reinforcing bar bending machine of [1], a space (gap) can be formed between the bent reinforcing bar and the first bending unit and the second bending unit in the axial direction of the reinforcing bar. By forming this space, the reinforcing bar can be smoothly carried out from the first bending unit and the second bending unit.

[0014] According to the rebar bending machine [2], a guide portion is provided on each fulcrum member of the first bending processing unit and the second bending processing unit, so that the relative movement of the first bending processing unit and the second bending processing unit can be performed smoothly.

[0015] According to the reinforcing bar bending machine of [3], the reinforcing bar and the guide portion can be kept in a non-contact or nearly non-contact state when the first bending unit and the second bending unit move relative to each other.

[0016] According to the rebar bending machine of [4], in the third and fourth processes, space can be saved compared to a configuration in which the first bending processing unit and the second bending processing unit move relatively in directions away from each other.

[0017] According to the reinforcing bar bending machine of [5], only one of the first bending unit and the second bending unit moves, which simplifies control and reduces costs.

[0018] According to the rebar bending machine of [6], the carrying-out unit, which is arranged between the first bending unit and the second bending unit and carries out the bent rebar, is configured to lift and carry out the rebar at an angle to the installation surface on which the rebar bending machine is installed. With this configuration, the rebar is likely to get caught between the rebar and the bending unit when being carried out, but by creating the above-mentioned space, this catch can be suppressed and the rebar can be carried out smoothly.

[0019] According to the rebar bending machine of [7], the supply of rebar to the first bending processing unit and the second bending processing unit is configured to utilize the discharge unit, so that the supply and discharge of rebar can be performed in one unit, which not only saves space but also reduces the number of components and simplifies the drive system.

[0020] According to the reinforcing bar bending method of [8], a space can be formed between the bent reinforcing bar and the first bending unit and the second bending unit. By forming this space, the reinforcing bar can be smoothly carried out from the first bending unit and the second bending unit. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view showing a state in which a reinforcing bar is being carried in a reinforcing bar bending machine according to one aspect of the technology disclosed herein; FIG. [Figure 2] FIG. 2 is a perspective view showing a state in which a reinforcing bar is set in a first bending unit and a second bending unit. [Figure 3] 10 is a plan view showing the operation of the first bending unit and the second bending unit. FIG. [Figure 4] 10 is a plan view showing the operation of the first bending unit and the second bending unit. FIG. [Figure 5] 10 is a plan view showing the operation of the first bending unit and the second bending unit. FIG. [Figure 6] 10 is a plan view showing the operation of the first bending unit and the second bending unit. FIG. [Figure 7] 10 is a plan view showing the operation of the first bending unit and the second bending unit. FIG. [Figure 8] 10 is a plan view showing the operation of the first bending unit and the second bending unit. FIG. [Figure 9] FIG. 2 is a perspective view showing the reinforcing bar conveying state in the reinforcing bar bending machine. [Figure 10] FIG. 10 is a flowchart for explaining the operation when each of the first bending unit and the second bending unit is equipped with a carry-out arm. DETAILED DESCRIPTION OF THE INVENTION

[0022] FIG. 1 is a diagram showing a schematic configuration of a rebar bending machine according to one embodiment of the technology disclosed herein. In the following description, the directions of front, back, left, right, and up and down are described as directions when the rebar bending machine is viewed from the front. For example, up and down are described with the front side facing the rebar bending machine as the front, the back side as the back, the right side facing the rebar bending machine as the right side, the left side as the left side, and the floor on which the rebar bending machine is installed as the bottom. In addition, the directions of front, back, left, right, and up and down are indicated by arrows in the drawings.

[0023] As shown in Figure 1, the rebar bending machine 10 includes a first bending unit 11 on the left side of the figure that bends one end of a long rebar 80, a second bending unit 22 on the right side of the figure that bends the other end of the rebar 80, and a control device 30 including a processor 31 that controls the first bending unit 11 and the second bending unit 22. The first bending unit 11 and the second bending unit 22 are arranged side by side in the axial direction of the rebar 80 supplied to the processing surface. The first bending unit 11 and the second bending unit 22 are placed on a base 90 provided on the floor surface. The upper surface of the base 90 forms the installation surface for the rebar bending machine 10.

[0024] The reinforcing bar bending machine 10 is provided with a standby section 50 that holds a plurality of reinforcing bars 80 before processing, behind the first bending unit 11 and the second bending unit 22. The reinforcing bar bending machine 10 further includes a carry-out unit 40 that is arranged between the first bending unit 11 and the second bending unit 22 and toward the front.

[0025] The first bending unit 11 is provided with a structure for bending the reinforcing bar 80 on the upper end side of the rectangular parallelepiped main body 13. For example, a pair of front and rear fulcrum members 16 that regulate the front and rear positions of the reinforcing bar 80 are fixedly provided in an approximately central region of the top surface of the main body 13. A turntable 15 that can rotate around the fulcrum members 16 is provided on the main body 13, and a cylindrical force application member 17 that applies a bending force to the reinforcing bar 80 is provided on the turntable 15. The rotation of the turntable 15 is controlled by the processor 31. A pair of front and rear first support members 14 that can support the reinforcing bar 80 so as to sandwich it from the front and rear are provided on the right side of the turntable 15 on the main body 13. The pair of first support members 14 are movable back and forth and are controlled by the processor 31. When the pair of first support members 14 move toward each other, they assume a support state in which they sandwich and support the reinforcing bar 80 placed between them. Furthermore, when the pair of first support members 14 move in directions away from each other, they assume an open state in which they release support for the reinforcing bar 80 disposed between them.

[0026] The second bending unit 22 has the same configuration as the first bending unit 11, and is disposed immediately to the right of the first bending unit 11 so as to be symmetrical to the first bending unit 11. Regarding the reference numerals of the components of the second bending unit 22, the second support member 24, which has the same function as the first support member 14, is given a different reference numeral for convenience, but the other components are given the same reference numerals and their explanations will be omitted.

[0027] The first bending unit 11 and the second bending unit 22 are configured to be relatively movable in the axial direction (left-right direction) of the reinforcing bar 80. For example, it is possible to adopt either a configuration in which only one of the first bending unit 11 and the second bending unit 22 is movable left-right, or a configuration in which both the first bending unit 11 and the second bending unit 22 are movable left-right. In the following description, it is assumed that the left-right position of the second bending unit 22 is fixed, and only the first bending unit 11 is configured to be movable left-right.

[0028] The standby section 50 is provided behind the first bending unit 11 and the second bending unit 22, and a large number of reinforcing bars 80 are held on a plurality of support plates 51 extending in the front-to-rear direction at a position higher than the first bending unit 11 and the second bending unit 22. A feed-out section 52 made of a chain or the like that can feed the reinforcing bars 80 forward is provided on the reinforcing bar support surface of the support plate 51. By operating this feed-out section 52, the reinforcing bars 80 can be fed to the inclined section on the front side of the support plate 51. A reinforcing bar feed-out member 53 that moves up and down to appear and disappear from the reinforcing bar support surface and feeds the reinforcing bars 80 to the first bending unit 11 and the second bending unit 22 is provided on the front side of the support plate 51.

[0029] The carry-out unit 40 supplies the reinforcing bar 80 to the first bending unit 11 and the second bending unit 22 and carries the reinforcing bar 80 out of the first bending unit 11 and the second bending unit 22. For example, the reinforcing bar 80 sent out from the waiting section 50 is held by rear end holding portions 41a of a pair of left and right pivot arms 41 that pivot about a rotation shaft 42 as a fulcrum. At this time, the reinforcing bar 80 is held in a substantially horizontal position by the rear end holding portions 41a of the pivot arms 41 and the rear end edge 61 of the position restriction guide 60 of the carry-out unit 40. Thereafter, the pivot arm 41 rotates, causing the rear end holding portions 41a to rise, and the reinforcing bar 80, which is no longer positioned by the rear end edge 61 of the position restriction guide 60, slides down the upper edge 62 of the position restriction guide 60, drops into the position restriction recess 63, and is input into the processing surfaces of the first bending unit 11 and the second bending unit 22. Although FIG. 1 shows the process of feeding one reinforcing bar 80 onto the processing surface, it is also possible to feed a plurality of reinforcing bars 80 onto the processing surface together.

[0030] When one or more reinforcing bars 80 are fed onto the processing surface, the processor 31 performs a first process in which the first bending unit 11 is controlled to bend one end of the reinforcing bar 80, and a second process in which the second bending unit 22 is controlled to bend the other end of the reinforcing bar 80. After the first and second processes, the processor 31 also controls the first support member 14, the second support member 24, and the first bending unit 11, as described below, to create a state in which the reinforcing bar 80 can be easily removed after bending.

[0031] A method for bending a reinforcing bar using the reinforcing bar bending machine 10 will be described below with reference to the drawings. Fig. 2 is a perspective view showing a state in which a reinforcing bar 80 is set on the processing surfaces of the first bending unit 11 and the second bending unit 22. Figs. 3 to 8 are plan views showing the operation of the first bending unit 11 and the second bending unit 22. The carry-out unit 40 is omitted from Figs. 2 to 8.

[0032] First, as shown in FIG. 2, the reinforcing bar 80 loaded onto the processing surface by the carry-out unit 40 has both ends positioned by the fulcrum members 16 of the first bending unit 11 and the second bending unit 22. In this state, the axial position of the reinforcing bar 80 is positioned by an end positioning device (not shown) or the like. In this state, the processor 31 controls the pair of first support members 14 to move toward each other (direction Y1 in the figure) to place the first support members 14 in a supporting state, and controls the pair of second support members 24 to move toward each other (direction Y1 in the figure) to place the second support members 24 in a supporting state. As a result, the reinforcing bar 80 is firmly supported by being sandwiched between the first support members 14 and the second support members 24.

[0033] Next, as shown in FIG. 3 , the processor 31 rotates the turntables 15 of the first bending unit 11 and the second bending unit 22 to perform a first process and a second process in which the force application members 17 bend one end and the other end of the rebar 80. In these first and second processes, the rebar 80 is bent until both ends of the rebar 80 are bent back to a bending angle greater than 90 degrees, e.g., 180 degrees. At this time, the force application members 17, as shown in FIG. 3 , move to a position where the rebar 80 is bent to an angle of 180 degrees or more, and then return to a standby position. This causes both ends of the rebar 80 to spring back, resulting in a bending angle of 180 degrees. The order in which the first and second processes are performed is not important. For example, the first and second processes may be performed simultaneously or sequentially.

[0034] After the first and second processes are completed, the processor 31 performs a third process. In this third process, the processor 31 controls the first support members 14 of the first bending unit 11 to an open state. In this open state, as shown in FIG. 4, the pair of first support members 14 move in an opening direction (direction Y2 in the figure). Thereafter, while controlling the second support member 24 to be in a supporting state, the processor 31 moves the first bending unit 11 a first distance d1 to the right (arrow X1 in the figure) to bring it closer to the second bending unit 22.

[0035] In this third process, since the position of the reinforcing bar 80 is fixed by the supporting force of the second supporting member 24, the first bending unit 11 moves a first distance d1 to the right relative to the reinforcing bar 80. As a result, a first space S1 (gap) equivalent to the first distance d1 is formed between the left-hand bent portion 80L of the reinforcing bar 80 and the fulcrum member 16 of the first bending unit 11.

[0036] A guide portion 16a, which is a plane perpendicular to the front-to-rear direction, is formed on the outer peripheral surface of the front side of the fulcrum member 16. A left tip portion 81, which is the folded portion of the reinforcing bar 80 after bending, and the guide portion 16a face each other and are substantially parallel, with a gap maintained between them. Therefore, when the first bending unit 11 moves rightward in the third process, the left tip portion 81 moves leftward relative to the guide portion 16a, allowing the first bending unit 11 to move smoothly.

[0037] When the third process is completed, the processor 31 performs a fourth process. In this fourth process, first, as shown in Fig. 5, the processor 31 moves the pair of first support members 14 of the first bending unit 11 in direction Y1, thereby controlling the first support members 14 to a supporting state. Next, as shown in Fig. 6, the processor 31 moves the second support members 24 of the second bending unit 22 in a direction away from each other (direction Y2), thereby controlling the second support members 24 to an open state. Thereafter, as shown in Fig. 7, the processor 31 moves the first bending unit 11 a second distance d2 to the right (arrow X2 in the figure) to bring it closer to the second bending unit 22.

[0038] In this fourth process, the first bending unit 11 and the reinforcing bar 80 are fixed together by the support force of the first support member 14, so the reinforcing bar 80 and the first bending unit 11 move together to the right. As a result, a second space S2 (gap) corresponding to the second distance d2 is formed between the right-side bent portion 80R of the reinforcing bar 80 and the fulcrum member 16 of the second bending unit 22.

[0039] The fulcrum member 16 of the second bending unit 22 is also formed with a guide portion 16a, so that the right tip portion 82, which is the folded portion of the reinforcing bar 80 after bending, and the guide portion 16a face each other and are generally parallel, with a gap maintained between them. Therefore, when the first bending unit 11 and the reinforcing bar 80 move rightward in the fourth process, the right tip portion 82 moves rightward along the guide portion 16a, and the first bending unit 11 and the reinforcing bar 80 move smoothly.

[0040] The order of execution of the third process and the fourth process may be reversed. After the third process and the fourth process are completed, the processor 31 controls the discharge unit 40 to perform a process of removing the processed rebar 80. In this case, the processor 31 controls the first support member 14 to an open state, as shown in Figure 8. This allows the processed rebar 80 to be placed on the processing surface without any constraints.

[0041] Next, the processor 31 drives the pivot arm 41 to move it upward, as shown in FIG. 9 . At this time, the reinforcing bar 80 is lifted from below by the upper edge 41b of the pivot arm 41. When the reinforcing bar 80 is lifted by the pivot arm 41, it rotates such that the left and right tip portions 81 and 82 are left behind due to the rotational moment. At this time, the bent portions 80L and 80R on both the left and right sides of the reinforcing bar 80 are separated from the fulcrum member 16 by spaces S1 and S2, respectively, which allows for smooth upward movement. In addition, the guide portion 16a is configured as a flat surface and is spaced a predetermined distance from the left and right tip portions 81 and 82, which reduces contact of the reinforcing bar 80 with the fulcrum member 16 due to rotation.

[0042] When the reinforcing bar 80 thus lifted passes over the position restricting recess 63, it descends along the slope of the upper end edge 41b of the rotating arm 41 and is dropped into the reinforcing bar storage section 43 and carried out.

[0043] As described above, the rebar bending machine 10 can form a space S1 between the left end of the rebar 80 bent by the first process and the fulcrum member 16, and a space S2 between the right end of the rebar 80 bent by the second process and the fulcrum member 16. The presence of these spaces S1 and S2 eliminates the possibility of the rebar 80 being caught due to friction caused by contact when the bent portion is pulled away from the fulcrum member 16 when removing the bent rebar 80, allowing the rebar 80 to be removed smoothly. In particular, when bending the rebar 80 to a bending angle of 180 degrees, the bent rebar 80 is wound around the fulcrum member 16, which can easily cause the rebar 80 to get caught on the fulcrum member 16 when removing the rebar 80. For this reason, the technology disclosed herein is particularly effective when bending the rebar 80 to a bending angle of 180 degrees.

[0044] When bending the reinforcing bar 80 to a bending angle of 180 degrees, it is preferable that a certain distance be secured between the left tip portion 81 and the fulcrum member 16 in the front-to-rear direction and between the right tip portion 82 and the fulcrum member 16 in the third and fourth processes to ensure smooth movement of the first bending unit 11. According to the technology disclosed herein, the fulcrum member 16 is provided with a guide portion 16a, thereby ensuring sufficient distances. Furthermore, by ensuring sufficient distances, the left tip portion 81 and the right tip portion 82 are less likely to get caught on the fulcrum member 16 when the reinforcing bar 80 is lifted by the rotating arm 41, allowing the reinforcing bar 80 to be smoothly removed.

[0045] If the first bending unit 11 and the second bending unit 22 are configured to be movable left and right, after the state shown in Fig. 6 is reached, the processor 31 may control the second bending unit 22 to move leftward by the second distance d2, thereby forming the space S2 shown in Fig. 7.

[0046] In the above embodiment, the fulcrum member 16 having the guide portion 16a is configured as a pair of front and rear portions that restrict the position of the reinforcing bar 80 from the front-rear direction, but this configuration is not limited to this. For example, a single cylindrical fulcrum member may be used, and in this case, the guide portion 16a may be configured so that flat surfaces perpendicular to the front-rear direction are provided on both the front and rear of the cylindrical fulcrum member.

[0047] In the above embodiment, the guide portion 16a is configured as a flat surface, but this is not limiting. For example, it may be curved as appropriate, and may not have a flat planar shape.

[0048] The rebar bending machine 10 may also use a different method of removing the rebar 80 from the above-described method. For example, the rebar 80 may be removed from the processing surface by lifting it straight up rather than at an angle relative to the base 90. For example, the rebar 80 may be lifted straight up until it is separated from the fulcrum member 16, and then pushed out horizontally, rolled at an angle, or grasped by a robot to be transported to the destination. Even with this type of removal method, the presence of a gap between the rebar 80 and the fulcrum member 16 allows the rebar 80 to be lifted smoothly, enabling the rebar 80 to be transported efficiently.

[0049] Furthermore, instead of lifting and carrying out the reinforcing bar 80 between the first bending unit 11 and the second bending unit 22, a method may be adopted in which both ends of the reinforcing bar 80 are grasped and carried out by a robot or the like. In this case, the reinforcing bar 80 can be lifted by grasping both ends (for example, the folded U-shaped portion), but since a gap is formed between the fulcrum member 16 and the reinforcing bar 80, the reinforcing bar 80 and the fulcrum member 16 are less likely to get caught, allowing the reinforcing bar 80 to be lifted smoothly and carried out efficiently.

[0050] It is also possible to employ a method in which the fulcrum member 16 is retracted and then the reinforcing bar 80 is pushed out horizontally to be removed. In this case, too, the presence of a gap between the fulcrum member 16 and the reinforcing bar 80 allows the fulcrum member 16 to be retracted smoothly.

[0051] In the above description, the bent rebar 80 is carried out by the carry-out unit 40 provided between the first bending unit 11 and the second bending unit 22, but this is not limited to this. For example, a carry-out arm may be provided on the side opposite the carry-out unit 40 in each of the first bending unit 11 and the second bending unit 22, and in some cases, this carry-out arm may be used to lift and carry out the bent rebar 80 from both ends. Figure 10 is a flowchart for explaining an example of operation when each of the first bending unit 11 and the second bending unit 22 is equipped with a carry-out arm.

[0052] The processor 31 executes one of the first process and the second process (step S1), executes the other of the first process and the second process (step S2), then executes one of the third process and the fourth process (step S3), and then executes the other of the third process and the fourth process (step S4), thereby obtaining the state shown in FIG. 7.

[0053] Next, the processor 31 detects the position of the first bending unit 11. This position detection can be performed, for example, by using the output of a sensor or the like provided in the first bending unit 11. The processor 31 determines whether or not the first bending unit 11 and the carry-out unit 40 will interfere with each other based on the detected position (step S5). If the first bending unit 11 is located at a position where the first bending unit 11 and the carry-out unit 40 will interfere with each other when the carry-out unit 40 is operated (step S5: YES), the processor 31 operates the carry-out arms of the first bending unit 11 and the second bending unit 22 to carry out the reinforcing bar 80 (step S7). If the first bending unit 11 is located at a position where the first bending unit 11 and the carry-out unit 40 will not interfere with each other when the carry-out unit 40 is operated (step S5: NO), the processor 31 operates the carry-out unit 40 to carry out the reinforcing bar 80 (step S6). [Explanation of symbols]

[0054] 10 Rebar bending machine 11 First bending unit 14 First support member 16a Guide part 22 Second bending unit 24 Second support member 30 Control device 31 processors 40 Unloading unit 50 Waiting section 80 Reinforced concrete

Claims

1. a first bending unit for bending one end of the reinforcing bar; A second bending unit that bends the other end of the reinforcing bar; a processor, The first bending unit and the second bending unit are arranged side by side in the axial direction of the reinforcing bar and are configured to be relatively movable in the axial direction, The first bending unit has a first support member that can switch between a support state in which the reinforcing bar is supported and an open state in which the support of the reinforcing bar is released, The second bending unit has a second support member that can switch between a support state in which the reinforcing bar is supported and an open state in which the support of the reinforcing bar is released, The processor: a first process of controlling the first bending unit to bend one end of the reinforcing bar; A second process of controlling the second bending unit to bend the other end of the reinforcing bar; a third process of moving the first bending unit and the second bending unit relative to each other while controlling the first support member to be in a supporting state and the second support member to be in an open state after the first process and the second process; A rebar bending machine that, after the first process and the second process, performs a fourth process in which the first bending unit and the second bending unit are moved relative to each other while controlling the first support member to an open state and the second support member to a supported state.

2. The reinforcing bar bending machine according to claim 1, the first bending unit and the second bending unit each have a fulcrum member, In the first process and the second process, the end of the reinforcing bar is bent until it reaches a bending angle at which it is folded back, The fulcrum member has a guide portion that guides the relative movement between the fulcrum member and the reinforcing bar when the relative movement occurs during the third process and the fourth process.

3. The reinforcing bar bending machine according to claim 2, The guide portion is a reinforcing bar bending machine configured by a plane facing the end of the reinforcing bar folded back by the first processing and the second processing.

4. The reinforcing bar bending machine according to any one of claims 1 to 3, In the third process and the fourth process, the first bending unit and the second bending unit are moved relatively to each other so that they approach each other.

5. The reinforcing bar bending machine according to claim 4, The processor controls the rebar bending machine to move the first bending processing unit closer to the second bending processing unit in each of the third process and the fourth process.

6. The reinforcing bar bending machine according to any one of claims 1 to 3, a carrying-out unit disposed between the first bending unit and the second bending unit, for carrying out the bent reinforcing bar; The carrying-out unit is a rebar bending machine that lifts and carries out the rebar at an angle to an installation surface on which the rebar bending machine is installed.

7. The reinforcing bar bending machine according to claim 6, The carrying-out unit is a rebar bending machine that further supplies rebars from a waiting section where the rebars are waiting to the first bending unit and the second bending unit.

8. a first process for bending one end of the reinforcing bar by controlling a first bending unit including a first support member that can switch between a support state in which the reinforcing bar is supported and an open state in which the support of the reinforcing bar is released; a second process for bending the other end of the reinforcing bar by controlling a second bending unit including a second support member that can switch between a support state in which the reinforcing bar is supported and an open state in which the support of the reinforcing bar is released; a third process in which, after the first process and the second process, the first support member is controlled to be in a supported state and the second support member is controlled to be in an open state, and the first bending unit and the second bending unit are moved relatively in the axial direction of the reinforcing bar; A rebar bending method comprising: after the first process and the second process, performing a fourth process in which the first support member is controlled to an open state and the second support member is controlled to a supported state, and the first bending processing unit and the second bending processing unit are moved relative to each other in the axial direction.

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