Reinforcing bar machining device and operation method thereof

Abstract

To improve maintainability of a reinforcing bar machining device.SOLUTION: A reinforcing bar machining device includes: an air cylinder; a movable part driven by the air cylinder; a unit for performing air supply to the air cylinder and collection of air discharged from the air cylinder; an exhaust port of the collected air provided in the unit; and a tubular member having one end connected to the exhaust port. The other end of the tubular member is held at a position at which the collected air can be jetted to a predetermined region of the reinforcing bar machining device in which iron powder dropped from the reinforcing bar by reinforcing bar machining may be attached.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The disclosed technology relates to a rebar processing machine and a method of operating the same. [Background technology]

[0002] Patent Document 1 describes a reinforcing bar bending machine that can bend reinforcing bars up and down. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-12029 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology of the present disclosure aims to improve the maintainability of rebar processing machines. [Means for solving the problem]

[0005] One aspect of the technology of the present disclosure is as follows.

[0006] (1) A rebar processing machine, An air cylinder; a movable part driven by the air cylinder; a unit for supplying air to the air cylinder and recovering air discharged from the air cylinder; an exhaust port for the recovered air provided in the unit; a tubular member having one end connected to the exhaust port, The other end of the tubular member is held in a position where it can inject the recovered air into a predetermined area of ​​the rebar processing machine where iron powder that falls off from the rebar during processing of the rebar may adhere.

[0007] (2) The reinforcing bar processing machine according to (1), The air cylinder is provided in a plurality of units that operate at different timings, The unit is a rebar processing machine that collects air from the plurality of air cylinders at different times and discharges the collected air from the exhaust port.

[0008] (3) A reinforcing bar processing machine according to (1) or (2), Equipped with a processing unit for processing rebar, the processing unit includes a fixed member and a movable unit movable relative to the fixed member, The predetermined area includes at least one of a passage area of ​​the movable unit in the fixed member and an adjacent area adjacent to the passage area.

[0009] (4) (3) The reinforcing bar processing machine according to the passage area is exposed when the movable unit is located at one end of the movable range, and is covered by the movable unit when the movable unit is located at the other end of the movable range; The adjacent area is exposed whether the movable unit is at one end or the other end of the movable range.

[0010] (5) (4) A reinforcing bar processing machine according to the present invention, The movable unit includes a fulcrum member and a force application member, and when the movable unit is positioned at the other end of the movable range, the force application member bends the reinforcing bar.

[0011] (6) A method for operating a rebar processing machine including an air cylinder, comprising: A method for operating a reinforcing bar processing machine, comprising the step of injecting air discharged from an exhaust port for the recovered air, which is provided in a unit that supplies air to the air cylinder and recovers the air discharged from the air cylinder, into a predetermined area of ​​the reinforcing bar processing machine where iron powder that falls off from the reinforcing bar during processing of the reinforcing bar may adhere. [Effects of the Invention]

[0012] According to (1) and (6), iron powder that adheres to the predetermined area during rebar processing can be blown away using air generated by operating the air cylinder. For example, consider a case where a rebar processing machine has a fixed member and a movable member that can slide on the surface of the fixed member, and iron powder adheres to the surface of the fixed member. In this case, removing the iron powder allows the movable member to move smoothly relative to the fixed member. As a result, the maintainability of the rebar processing machine can be improved.

[0013] According to (2), each time the plurality of air cylinders are actuated, air is jetted to a predetermined area where iron particles may adhere, so that the iron particles can be removed with a higher degree of accuracy.

[0014] According to (3), iron powder adhering to at least one of the passage surface of the fixed unit and the area adjacent thereto can be removed, so that the movable unit can move smoothly relative to the fixed unit.

[0015] According to (4), when the movable unit is at one end and the other end of the movable range, it is possible to remove iron powder that adheres to the area where iron powder is relatively likely to adhere, thereby enabling smooth movement of the movable unit relative to the fixed unit.

[0016] According to (5), even if iron powder generated during bending adheres to the above-mentioned area exposed during bending, it can be removed. Therefore, when the bending is completed and the movable unit moves, it can move smoothly. Furthermore, even if iron powder falls on the moving surface when the movable unit returns to its original position after the bending is completed, it can be removed. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a reinforcing bar bending machine 100 according to one embodiment of the technology of the present disclosure. [Figure 2]FIG. 2 is an enlarged perspective view showing the periphery of the processing unit 10 of the reinforcing bar bending machine 100 shown in FIG. [Figure 3] FIG. 3 is an enlarged perspective view of only the machining unit 10 shown in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line AA shown in FIG. [Figure 5] FIG. 5 is a view showing the machining unit 10 shown in FIG. 3 with the cover 13 removed. [Figure 6] FIG. 6 is a diagram showing a state in which the movable unit 12 has moved from the state shown in FIG. 4 to the front end of the movable range. [Figure 7] FIG. 7 is a diagram illustrating the movement area of ​​the movable unit 12 on the upper surface portion 11U, and is a partially enlarged view seen from the upward direction U. [Figure 8] FIG. 8 is an enlarged perspective view showing a state in which the movable unit 12 is positioned at the front end of its movable range. [Figure 9] FIG. 9 is a partially enlarged perspective view showing a modified example of the arrangement position of the injection nozzle 132B. DETAILED DESCRIPTION OF THE INVENTION

[0018] 1 is a diagram showing a schematic configuration of a reinforcing bar bending machine 100 according to one embodiment of the technology of the present disclosure. The reinforcing bar bending machine is used to bend reinforcing bars, and is an example of a reinforcing bar processing machine.

[0019] In the following description, the orientation of the rebar bending machine 100 is defined as the direction when viewed from the front (the side where the worker stands). For example, the front side of the rebar bending machine 100 is referred to as the forward direction Fr, the back side as the rear direction Rr, the right side as the right direction R, the left side as the left direction L, the floor surface on which the rebar bending machine 100 is installed as the downward direction D, and the direction opposite to the downward direction D as the upward direction U. The forward direction Fr and the rear direction Rr are collectively referred to as the forward-backward direction, the right direction R and the left direction L are collectively referred to as the left-right direction, and the upward direction U and the downward direction D are collectively referred to as the up-down direction. The left-right direction constitutes a first direction, the front-back direction constitutes a second direction intersecting the first direction, and the up-down direction constitutes a third direction intersecting the first and second directions.

[0020] As shown in Fig. 1, the rebar bending machine 100 includes a support base 30 extending in the left-right direction and placed on a support surface such as a floor or the ground, a processing unit 10 on the left side of the figure supported on the support base 30 so as to be movable in the left-right direction, a processing unit 20 on the right side of the figure supported on the support base 30 so as to be movable in the left-right direction, a chucking device 40 provided between the processing units 10 and 20, and a control device (not shown) including a processor that controls the processing units 10, 20, and chucking device 40. The processing units provided in the rebar bending machine 100 bend rebars using fulcrum members and force application members. Although the number of processing units is two, this is not limited to this, and any number of processing units can be provided depending on the application.

[0021] A gear 61 connected to a motor (not shown) is provided at the left end of the support table 30, and a gear 62 is provided at a position on the support table 30 immediately to the left of the chucking device 40. A drive chain 63 is stretched between the gears 61 and 62, and the drive chain 63 rotates when the motor is activated. The machining unit 10 is connected to this drive chain 63, and is configured to move left and right along the support table 30 when the motor is activated and the drive chain 63 rotates. The drive chain 63 constitutes a drive member that transmits to the machining unit 10 a drive force (rotational force of the motor) that moves the machining unit 10 left and right.

[0022] A gear 64 connected to a motor (not shown) is provided at the right end of the support table 30, and a gear 65 is provided at a position on the support table 30 immediately to the right of the chucking device 40. A drive chain 66 is stretched between the gears 64 and 65, and the drive chain 66 rotates when the motor is activated. The machining unit 20 is connected to this drive chain 66, and is configured to move left and right along the support table 30 as the drive chain 66 rotates. The chucking device 40 is provided to maintain the position of the supplied rebar 50 in the front-to-rear and up-down directions. The drive chain 66 constitutes a drive member that transmits drive force (motor rotational force) to the machining unit 20 to move the machining unit 20 left and right.

[0023] The machining units 10 and 20 have the same configuration and are mounted on the support base 30 so as to be symmetrical when viewed from the front. Therefore, the following will describe the configurations of the machining unit 10 and the drive chain 63, and will not describe the configuration of the machining unit 20.

[0024] FIG. 2 is an enlarged perspective view of the periphery of the processing unit 10 of the rebar bending machine 100 shown in FIG. 1. As shown in FIG. 2, the support base 30 has an H-shaped cross section perpendicular to the left-right direction and is made of, for example, an H-beam. The support base 30 includes an upper flat plate portion 30U and a lower flat plate portion 30D that are arranged facing each other and spaced apart in the vertical direction, and a partition wall 30C that connects the front-to-rear central portions of the upper flat plate portion 30U and the lower flat plate portion 30D. The support base 30 has a front space 30Fr and a rear space 30Rr that are aligned in the front-to-rear direction and defined by the upper flat plate portion 30U, the lower flat plate portion 30D, and the partition wall 30C. A guide rail 31 extending in the left-to-right direction is provided on the top surface of the upper flat plate portion 30U.

[0025] The processing unit 10 comprises a fixed unit 11 whose position in the front-to-rear direction is fixed, a movable unit 12 configured to be movable in the front-to-rear direction relative to the fixed unit 11, and a holding unit 14 provided in front of the movable unit 12 in the fixed unit 11.

[0026] Fig. 3 is an enlarged perspective view of only the processing unit 10 shown in Fig. 2. Fig. 4 is a schematic cross-sectional view taken along line AA shown in Fig. 1. The movable unit 12 has a substantially rectangular parallelepiped shape, and at its front end, a fulcrum roller 122 constituting a fulcrum member, and a force point roller 123 constituting a force application member configured to be rotatable around the fulcrum roller 122, are provided to protrude in the forward direction Fr.

[0027] As shown in FIG. 4, the fixed unit 11 has a flat upper surface portion 11U arranged above the support base 30. The upper surface portion 11U constitutes a fixed member. The movable unit 12 is configured to be movable in the front-to-rear direction along an upper surface 11Ua (see FIG. 3) of this upper surface portion 11U. Note that FIGS. 3 and 4 show a state in which the movable unit 12 is at the rear end position (first position) of its movable range. The upper surface portion 11U is provided with a flat front surface portion 11Fr arranged in front of the support base 30 and a flat rear surface portion 11Rr arranged behind the support base 30, extending in the downward direction D. The upper surface portion 11U is provided with a plurality of rollers 114A between it and the support base 30 that sandwich the guide rail 31 from the front and rear, and a plurality of rollers 114B that abut against the upper flat plate portion 30U.

[0028] A protrusion 110 that protrudes toward the partition wall 30C is provided below the upper flat plate portion 30U on the front surface portion 11Fr. A protrusion 111 that protrudes toward the partition wall 30C is provided below the upper flat plate portion 30U on the rear surface portion 11Rr. As shown in Fig. 3, pressing portions 115 are provided in the top surface portion 11U in an area covered by the cover 13, facing the protrusions 110 and 111, respectively, and penetrating the top surface portion 11U in the vertical direction.

[0029] 5 is a diagram showing the machining unit 10 shown in FIG. 3 with the cover 13 removed. As shown in FIG. 5, a double-acting air cylinder AP3 connected to two pressing portions 115 is provided on the upper surface portion 11U. When the air cylinder AP3 is actuated, the pressing portions 115 connected thereto move up and down. When the pressing portions 115 are moved to the lower end, the upper flat plate portion 30U of the support base 30 is clamped between the pressing portions 115 and the protruding portions 110 and 111, thereby maintaining the left-right position of the machining unit 10. The pressing portions 115 constitute a movable portion driven by the air cylinder AP3.

[0030] As shown in Fig. 4, gears 61 and 62 are fixed to the rear surface of the partition wall 30C of the support base 30, and a drive chain 63 is stretched between them. In this way, the drive chain 63 is configured to be disposed in the rear space 30Rr of the support base 30. The drive chain 63 is also disposed eccentrically in the rear space 30Rr, closer to the partition wall 30C. In other words, the drive chain 63 is disposed forward of the center position of the rear space 30Rr in the front-to-rear direction. A connecting portion 112, which is connected to the drive chain 63, is provided on the rear surface portion 11Rr and protrudes toward the partition wall 30C.

[0031] 4, when the movable unit 12 is at the rear end of its movable range, the holding unit 14 is disposed facing and spaced a distance L1 forward from the fulcrum roller 122 and the force point roller 123 of the movable unit 12. The movable unit 12 is configured to be movable in the front-rear direction by a maximum of this distance L1.

[0032] 6 is a diagram showing a state in which the movable unit 12 has moved from the state shown in FIG. 4 to the front end of its movable range (a state in which the movable unit 12 is at the front end position (second position) in its movable range). As shown in FIG. 6, the holding unit 14 is configured to be able to hold the front end of the fulcrum roller 122 when the movable unit 12 is at the front end of its movable range. The holding unit 14 is provided with a lower arm 142 and an upper arm 141 for sandwiching and holding the reinforcing bar 50 placed on the fulcrum roller 122 from above and below when the holding unit 14 is holding the fulcrum roller 122.

[0033] The holding unit 14 is provided with a double-acting air cylinder AP2 (see FIG. 5) that drives the lower arm 142, and a double-acting air cylinder AP4 (see FIG. 6) that drives the upper arm 141. When the air cylinders AP2 and AP4 are actuated, the upper arm 141 moves from the state shown in FIG. 6 to the upper side of the reinforcing bar 50, and the lower arm 142 moves to the lower side of the reinforcing bar 50, thereby maintaining the position of the reinforcing bar 50 in the up-down and front-rear directions. The upper arm 141 constitutes a movable part that is driven by the air cylinder AP4. The lower arm 142 constitutes a movable part that is driven by the air cylinder AP2.

[0034] In Fig. 6, when the reinforcing bar 50 is held by the upper arm 141 and the lower arm 142, the force point roller 123 can be rotated toward the back of the page, thereby bending the reinforcing bar 50 in the downward direction D. In the processing unit 10, in Fig. 6, the reinforcing bar 50 can be placed between the fulcrum roller 122 and a support plate 143 provided on the holding unit 14, and the reinforcing bar 50 can be bent without using the upper arm 141 and the lower arm 142. In Fig. 6, when the reinforcing bar 50 is positioned below the fulcrum roller 122, the force point roller 123 can be moved from below the fulcrum roller 122 to above it, thereby bending the reinforcing bar 50 in the upward direction U.

[0035] In this way, the movable unit 12 is configured to be able to bend the reinforcing bar 50 in one direction (upward direction U) and the other direction (downward direction D) of the up-down direction (third direction) that intersects the left-right direction (first direction) and the front-to-back direction (second direction).

[0036] Fig. 4 shows the center of gravity BC1 of the machining unit 10 and the position P1 of the center of gravity BC1 in the front-to-rear direction (hereinafter referred to as the center of gravity position P1). Fig. 4 also shows the connection position P2 of the machining unit 10 and the drive chain 63 in the front-to-rear direction (synonymous with the position of the drive chain 63 in the front-to-rear direction).

[0037] 4, a first distance D1 between the center of gravity position P1 and the coupling position P2 is smaller than a distance L1 that is the maximum movement distance in the front-rear direction of the movable unit 12. In the state shown in FIG. 4, the coupling position P2 is located forward of the center of gravity position P1.

[0038] As shown in Fig. 6, when the movable unit 12 moves to the front end of its movable range, the position of the center of gravity BC1 changes slightly. Even in this state, the first distance D1 between the center of gravity position P1 and the coupling position P2 is smaller than the distance L1, which is the maximum movement distance of the movable unit 12 in the front-rear direction. More specifically, the first distance D1 in the state shown in Fig. 6 is smaller than the first distance D1 in the state shown in Fig. 4.

[0039] The distance L1 is small, being set to approximately the distance corresponding to the maximum number of rebars that can be bent at one time by the rebar bending machine 100. According to the rebar bending machine 100, the first distance D1 is smaller than the distance L1 regardless of whether the movable unit 12 is at either end of its movable range. Therefore, the driving force transmitted from the motor to the drive chain 63 can be transmitted to the machining unit 10 at a position sufficiently close to the center of gravity BC1 of the machining unit 10. As a result, the machining unit 10 can be moved in the left-right direction with high precision. The left-right positioning of the machining unit 10 is directly related to the bending accuracy of the rebar 50. Therefore, a small first distance D1 improves the bending accuracy. Furthermore, a small first distance D1 allows the machining unit 10 to be moved stably without increasing the capacity of the motor connected to the drive chain 63 or the strength of the connecting portion 112.

[0040] Furthermore, according to this embodiment, the first distance D1 is smaller than the distance L1 in both the state shown in Fig. 4 and the state shown in Fig. 6. Therefore, the difference between the first distance D1 in the state shown in Fig. 4 and the first distance D1 in the state shown in Fig. 6 can be made sufficiently small. As a result, the machining unit 10 can be moved stably without increasing costs, regardless of whether the movable unit 12 is at either end of the movable range.

[0041] 4, the position of the rear roller 114A, which is closer to the center of gravity BC1 of the pair of rollers 114A sandwiching the guide rail 31 from the front and rear, substantially coincides with the coupling position P2. In other words, when viewed in the vertical direction, the rear roller 114A and the drive chain 63 overlap. In addition, in this embodiment, in both the states shown in FIGS. 4 and 6, the coupling position P2 is located between the position of the guide rail 31 in the front-rear direction and the center of gravity position P1. These configurations enable the machining unit 10 to move more stably in the left-right direction without increasing costs.

[0042] 7 is a diagram illustrating the movement area of ​​the movable unit 12 on the upper surface portion 11U, and is a partially enlarged view seen from the upward direction U. As shown in FIG. 7, the upper surface 11Ua of the upper surface portion 11U includes a passing area 11A through which the movable unit 12 passes, and an adjacent area 11B adjacent to the front side of the passing area 11A. The passing area 11A is exposed when the movable unit 12 is located at the rear end (one end) of the movable range, and is covered by the movable unit 12 when the movable unit 12 is located at the front end (the other end) of the movable range. The adjacent area 11B is always exposed regardless of the position of the movable unit 12.

[0043] When the movable unit 12 is positioned at the front end of its movable range and the reinforcing bar 50 is bent by the force point roller 123, iron powder that falls off from the reinforcing bar 50 during the bending process may adhere to the adjacent region 11B that is exposed during the bending process.

[0044] Figure 8 is an enlarged perspective view showing the movable unit 12 positioned at the front end of its movable range. The adjacent region 11B exposed in the state shown in Figure 8 is located in a position that partially overlaps with the movement range of the force point rollers 123 when viewed from the top and bottom. For this reason, when the force point rollers 123 bend the reinforcing bar 50, iron powder is likely to adhere to the adjacent region 11B.

[0045] Furthermore, when the bending process is completed and the movable unit 12 moves to the rear end of its movable range, iron powder adhering to the force point roller 123 or the fulcrum roller 122 may fall, causing iron powder to adhere to the passing area 11A. The passing area 11A and the adjacent area 11B constitute a predetermined area of ​​the rebar bending machine 100 where iron powder that falls off from the rebar during processing of the rebar may adhere.

[0046] 5, the movable unit 12 is provided with a double-acting air cylinder AP1 for moving the movable unit 12 in the front-to-rear direction. The movable unit 12 moves in the front-to-rear direction when the air cylinder AP1 is actuated. The movable unit 12 constitutes a movable part that is driven by the air cylinder AP1.

[0047] The rebar bending machine 100 may be provided with air cylinders other than air cylinder AP1, air cylinder AP2, air cylinder AP3, and air cylinder AP4. Air cylinder AP1, air cylinder AP2, air cylinder AP3, and air cylinder AP4 include a plurality of air cylinders that operate at different times when bending the rebar 50. In this embodiment, the number of air cylinders provided in the rebar bending machine 100 is four, but the number of air cylinders is not limited to this. For example, the number of air cylinders may be one to three.

[0048] 5, the upper surface portion 11U is provided with a unit 130 that supplies air to air cylinders AP1, AP2, AP3, and AP4 and collects air discharged from air cylinders AP1, AP2, AP3, and AP4. Each of air cylinders AP1, AP2, AP3, and AP4 is connected to unit 130 by two air tubes (not shown).

[0049] The unit 130 supplies air supplied from an air inlet (not shown) to each of the air cylinders AP1, AP2, AP3, and AP4 via the air tubes. The unit 130 collects air discharged from each of the air cylinders AP1, AP2, AP3, and AP4 via the air tubes, and discharges the collected air from the exhaust port 131.

[0050] One end 132A of an air tube 132, which is an example of a tubular member, is connected to the exhaust port 131 of the unit 130. An injection nozzle 132B is provided at the other end of the air tube 132. The injection nozzle 132B is held in a position where it can inject air collected from each air cylinder by the unit 130 into at least one of the passage region 11A and the adjacent region 11B.

[0051] Here, an example of the operating state of each air cylinder will be described, but the present invention is not limited to this. 8, when the bending of the reinforcing bar 50 is completed, for example, air cylinders AP2 and AP4 are activated to release the holding of the reinforcing bar 50. As a result, the air discharged from air cylinders AP2 and AP4 passes through unit 130 and is sprayed from spray nozzle 132B. Because the air sprayed from spray nozzle 132B can reach the adjacent region 11B, even if iron powder has adhered to the adjacent region 11B due to the bending, the iron powder can be blown away by the activation of air cylinders AP2 and AP4.

[0052] Next, the air cylinder AP3 is activated to release the machining unit 10 from the support base 30. At this time, the air discharged from the air cylinder AP3 passes through the unit 130 and is sprayed from the spray nozzle 132B. Therefore, even if iron powder remains in the adjacent region 11B, the iron powder can be blown away by the operation of the air cylinder AP3.

[0053] Finally, the air cylinder AP1 is actuated, and the movable unit 12 moves to the rear end of the movable range. At this time, the air discharged from the air cylinder AP1 passes through the unit 130 and is sprayed from the spray nozzle 132B. Therefore, even if iron powder remains in the adjacent region 11B, the actuation of the air cylinder AP1 can blow away the iron powder. Furthermore, because the spray nozzle 132B is held in a position where it can also spray air into the passage region 11A, the actuation of the air cylinder AP1 can blow away the iron powder adhering to the passage region 11A.

[0054] In this way, air can be sprayed multiple times onto at least one of the passing area 11A and the adjacent area 11B. This makes it possible to prevent iron powder from clogging the gap between the movable unit 12 and the upper surface portion 11U, for example, and allows the movable unit 12 to move smoothly in the front-rear direction even when bending is repeated over a long period of time.

[0055] 9 is a partially enlarged perspective view showing a modified arrangement position of the injection nozzle 132B. As shown in FIG. 9, a guide member 150 extending in the front-rear direction is provided on the upper surface 11Ua of the upper surface portion 11U to the left of the movable unit 12 (also shown in FIG. 7). A through-hole 151 penetrating in the left-right direction is formed at the front end of the guide member 150. The tip of the air tube 132 is routed to the position of the through-hole 151, and the injection nozzle 132B is inserted inside the through-hole 151. According to the configuration example shown in FIG. 9, air can be injected from a position closer to the passing area 11A and the adjacent area 11B, and iron powder can be effectively removed.

[0056] In the above description, air discharged from each of the four air cylinders can be injected from the injection nozzle 132B. However, it is also possible to configure the injection nozzle 132B to inject air discharged from any one of the four air cylinders (the air cylinder that operates at the most effective timing for removing iron particles). For example, in the above operation example, only air discharged from air cylinder AP2, air cylinder AP3, or air cylinder AP4 can be supplied to the air tube 132. This allows air to be injected toward the adjacent region 11B, where iron particles tend to adhere, after the bending process is completed, thereby removing the iron particles. This allows the movable unit 12 to move without any iron particles near the passing region 11A, effectively preventing iron particles from entering between the movable unit 12 and the upper surface portion 11U.

[0057] The above-described technique of spraying air exhausted from the air cylinder during operation onto at least one of the passage area 11A and the adjacent area 11B is applicable not only to the rebar bending machine 100 but also to other machines. For example, even in a rebar cutting machine that cuts rebar, if there is an area where iron powder may adhere during cutting and affect operation, the spray nozzle 132B can be located at a position where air exhausted from the air cylinder can be sprayed onto that area. Furthermore, if the rebar cutting machine has a fixed member and a movable unit that moves relative to it, the iron powder adhering to the area of ​​the fixed member where the movable unit moves and the adjacent area can be removed, allowing the movable unit to move smoothly. In this way, the above-described technique is applicable to rebar processing machines such as rebar bending machines and rebar cutting machines. [Explanation of symbols]

[0058] L1 distance BC1 Center of gravity P1 Center of gravity position P2 connection position D1 First distance AP1, AP2, AP3, AP4 Air Cylinders 10,20 Processing unit 11 Fixed unit 11A Passage area 11B Adjacent Areas 11U top part 11Ua top 11Fr front part 11Rr Rear part 12 Mobile Unit 13 Cover 14 Holding unit 30 Support stand 30C Bulkhead 30D Lower flat plate part 30U upper flat plate part 30Fr front space 30Rr rear space 31 Guide rail 40 Chucking device 50 rebar 61, 62, 64, 65 Gears 63,66 Drive chain 100 Rebar bending machine 110,111 Protrusion 112 Connection section 114A, 114B Roller 115 Pressing part 122 Support roller 123 Force Point Roller 130 units 131 Exhaust port 132 Air Tube 132A One end 132B Injection Nozzle 141 Upper Arm 142 Lower Arm 143 Support plate

Claims

1. A rebar processing machine, An air cylinder; a movable part driven by the air cylinder; a unit for supplying air to the air cylinder and recovering air discharged from the air cylinder; an outlet for the recovered air provided in the unit; a tubular member having one end connected to the exhaust port, The other end of the tubular member is held in a position where it can inject the recovered air into a predetermined area of ​​the rebar processing machine where iron powder that falls off from the rebar during processing of the rebar may adhere.

2. The reinforcing bar processing machine according to claim 1, The air cylinder is provided in a plurality of units that operate at different timings, The unit is a rebar processing machine that collects air from the multiple air cylinders at different times and discharges the air from the exhaust port.

3. The reinforcing bar processing machine according to claim 1 or 2, Equipped with a processing unit for processing rebar, The processing unit includes a fixed member and a movable unit movable relative to the fixed member, The predetermined area includes at least one of a passing area of ​​the movable unit in the fixed member and an adjacent area adjacent to the passing area.

4. The reinforcing bar processing machine according to claim 3, the passage area is exposed when the movable unit is positioned at one end of the movable range, and is covered by the movable unit when the movable unit is positioned at the other end of the movable range; The adjacent area is exposed whether the movable unit is at one end or the other end of the movable range.

5. The reinforcing bar processing machine according to claim 4, The movable unit includes a fulcrum member and a force application member, and when the movable unit is positioned at the other end of the movable range, the force application member bends the reinforcing bar.

6. A method for operating a rebar processing machine including an air cylinder, comprising: A method for operating a reinforcing bar processing machine, comprising the step of injecting air discharged from an exhaust port for the recovered air, which is provided in a unit that supplies air to the air cylinder and recovers the air discharged from the air cylinder, into a predetermined area of ​​the reinforcing bar processing machine where iron powder that falls off from the reinforcing bar during processing of the reinforcing bar may adhere.

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