Butt adjustment method and press brake

Abstract

To quickly adjust the backgauge butt, reducing the burden on workers. [Solution] The press brake 1 includes a press brake body 10 that bends a workpiece along a bend line extending in the left-right direction, a backgauge 30 that is disposed behind the press brake body 10 and includes butts 42a, 42b against which the ends of the workpiece are butted to position the workpiece, and a guard 50 that is provided to surround the rear area of ​​the press brake body 10 including the backgauge 30 and restricts entry into the rear area. A method for adjusting the butts includes a first step of operating a Y-axis actuator 34 to move the butts 42a, 42b rearward, and a second step of manually moving the butts 42a, 42b in the left-right direction from an access area where the guard restriction is released, thereby adjusting the positions of the butts 42a, 42b in the left-right direction.

Description

[Technical Field]

[0001] The present invention relates to a method for adjusting abutment and a press brake. [Background technology]

[0002] Patent Document 1 discloses a press brake equipped with a back gauge that is disposed behind the upper and lower tables and that positions the workpiece to be machined. This back gauge is equipped with a stop that can be manually moved along a guide track that extends in the left-right direction. The operator must adjust the stop position depending on the machining. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] European Patent No. 2881188 Summary of the Invention [Problem to be solved by the invention]

[0004] However, a guard is installed behind the press brake, including the backgauge, to prevent workers from entering. Workers had to enter the guard after properly disengaging the guard, approach the backgauge, and then adjust the stop position. This required a lot of work to adjust the stop, placing a significant burden on the workers. [Means for solving the problem]

[0005] One aspect of one or more embodiments is a method for adjusting the position of a butt in a press brake including a press brake body that bends a workpiece along a bend line extending in the left-right direction, a backgauge disposed behind the press brake body and equipped with a butt against which an edge of the workpiece is butted to position the workpiece, and a guard that is provided to surround a rear area of ​​the press brake body including the backgauge and restricts access to the rear area. The adjustment method includes a first step of operating an actuator to move the butt rearward, and a second step of having a worker outside the guard manually move the butt in the left-right direction from an access area where the guard is released, thereby adjusting the position of the butt in the left-right direction. [Effects of the Invention]

[0006] According to one aspect of the present invention, the abutment adjustment work can be performed quickly, thereby reducing the burden on the worker. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a front view of a press brake according to this embodiment. [Figure 2] FIG. 2 is a rear view of the press brake according to this embodiment, showing the state in which the opening is closed. [Figure 3] FIG. 3 is a rear view of the press brake according to this embodiment, showing the state in which the opening is open. [Figure 4] FIG. 4 is a perspective view showing a backgage. [Figure 5] FIG. 5 is a first diagram showing a method for adjusting the abutment. [Figure 6] FIG. 6 is a second diagram showing the method of adjusting the abutment. [Figure 7] FIG. 7 is a third diagram showing a method for adjusting the abutment. [Figure 8] FIG. 8 is a fourth diagram showing a method for adjusting the abutment. [Figure 9]FIG. 9 is a fifth diagram showing a method for adjusting the abutment. [Figure 10] FIG. 10 shows a modified example of the door. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, a press brake and a method for adjusting abutment according to this embodiment will be described with reference to the drawings.

[0009] The configuration of the press brake 1 according to this embodiment will be described with reference to Figures 1 to 3. In this specification, the left-right direction, the front-rear direction, and the up-down direction are used to define directions in the press brake 1. The left-right direction and the front-rear direction correspond to two directions that are perpendicular to each other on a horizontal plane, and the up-down direction corresponds to the vertical direction. In Figure 1, the vertical direction of the paper surface corresponds to the front-rear direction, with the direction away from the paper surface being the forward direction and the direction toward the paper surface being the rearward direction. In Figures 2 and 3, the vertical direction of the paper surface corresponds to the front-rear direction, with the direction away from the paper surface being the rearward direction and the direction toward the paper surface being the forward direction. However, these directions are merely used for convenience in describing the bending system.

[0010] As shown in FIG. 1, the press brake 1 includes a press brake body 10, a back gauge 30, a guard 50, and a control device 100.

[0011] The press brake body 10 is a processing machine that bends a plate-shaped workpiece such as sheet metal along a bending line extending in the left-right direction through the cooperation of a lower tool 17 such as a die and an upper tool 18 such as a punch. The press brake body 10 includes left and right side plates 11, 12, a lower table 13, an upper table 14, and left and right table drive devices 19, 20.

[0012] The left and right side plates 11, 12 are arranged opposite each other and spaced apart in the left-right direction.

[0013] The lower table 13 extends in the left-right direction and is supported by the front lower parts of the left and right side plates 11, 12. A lower die holder 15 that detachably holds a lower die 17 is provided above the lower table 13 along the left-right direction.

[0014] The upper table 14 extends in the left-right direction and is supported on the front upper parts of the left and right side plates 11, 12 so as to face the lower table 13. The upper table 14 is configured to be movable in the up-down direction relative to the left and right side plates 11, 12. An upper die holder 16 that detachably holds an upper die 18 is provided below the upper table 14 along the left-right direction.

[0015] The left and right table drive devices 19, 20 are fixed to the upper parts of the left and right side plates 11, 12, respectively. Each table drive device 19, 20 is a drive device that moves the upper table 14 up and down. For example, the table drive devices 19, 20 are mainly composed of an electric motor that drives rotation and a ball screw mechanism that converts the rotational motion of the electric motor into linear motion. The table drive devices 19, 20 may also be composed of a hydraulic actuator.

[0016] The back gauge 30 is disposed behind the press brake body 10, specifically behind the lower and upper tables 13, 14. The back gauge 30 positions the workpiece by being abutted against the rear edge of the workpiece.

[0017] As shown in FIG. 4, the back gauge 30 includes a rectangular frame 31, a Y-axis carriage 35, left and right Z-axis carriages 36a, 36b, an X-axis beam 40, and left and right abutments 42a, 42b.

[0018] The rectangular frame 31 is attached to a support frame 21 (see FIG. 3) that spans the left and right side plates 11, 12 of the press brake body 10. The rectangular frame 31 is composed of a rectangular framework. Linear frames 31a, 31b located on the left and right of the rectangular frame 31 are provided with Y-axis guide rails 32a, 32b that extend in the front-to-rear direction. The rectangular frame 31 is provided with a Y-axis actuator 34 for moving a Y-axis carriage 35 in the front-to-rear direction. For example, the Y-axis actuator 34 includes an electric motor and a ball screw mechanism.

[0019] The Y-axis carriage 35 is mounted on left and right linear frames 31a and 31b. The Y-axis carriage 35 is able to move in the front-to-rear direction by being guided by Y-axis guide rails 32a and 32b. The Y-axis carriage 35 moves in the front-to-rear direction by operation of the Y-axis actuator 34. Z-axis carriages 36a and 36b are disposed at the left and right ends of the Y-axis carriage 35. Z-axis guide rails 37a and 37b extending in the vertical direction are provided on the Z-axis carriages 36a and 36b. The left and right Z-axis guide rails 37a and 37b are movably held by guide members fixed to the left and right ends of the Y-axis carriage 35. The Z-axis carriages 36a and 36b are able to move in the vertical direction by being guided by the Z-axis guide rails 37a and 37b.

[0020] The X-axis beam 40 extends in the left-right direction. The X-axis beam 40 is supported horizontally by the Z-axis carriages 36a and 36b. A Z-axis actuator 37 is provided in the center of the X-axis beam 40 to move the X-axis beam 40 up and down. For example, the Z-axis actuator 37 includes an electric motor and a ball screw mechanism. When the Z-axis actuator 37 operates, the X-axis beam 40 moves up and down. At this time, the movement of the X-axis beam 40 in the up and down direction is guided by the Z-axis carriages 36a and 36b.

[0021] The left and right butts 42a, 42b are components against which the rear edge of the workpiece is butted when positioning the workpiece. The left and right butts 42a, 42b are provided on the X-axis beam 40. The left and right butts 42a, 42b are configured to be slidable on the X-axis beam 40. The left and right butts 42a, 42b are not structured to be moved by an actuator, but are structured to be moved left and right by manual operation by the operator. Therefore, the operator must adjust the positions of the left and right butts 42a, 42b depending on the size of the workpiece. The X-axis beam 40 is provided with a scale 41 that serves as a guide when adjusting the positions of the left and right butts 42a, 42b.

[0022] In the backgage 30 configured as described above, the control device 100 controls the Y-axis and Z-axis actuators 34, 37 to move the X-axis beam 40 and the left and right butts 42a, 42b provided on the X-axis beam 40 in the front-rear and up-down directions. The front-rear and up-down positions of the butts 42a, 42b are adjusted by the operation of the Y-axis and Z-axis actuators 34, 37. Meanwhile, the left-right positions of the left and right butts 42a, 42b are manually adjusted by an operator.

[0023] As shown in Figures 1 and 2, the guard 50 is provided to surround the rear region of the press brake body 10. The rear region is an area located rearward of the lower and upper tables 13, 14, and also includes the backgauge 30. The guard 50 restricts the entry of workers into the rear region. In this embodiment, the guard 50 is made up of a plate that physically restricts the entry of workers.

[0024] The guard 50 includes a left guard 51, a right guard 52, and a rear guard 53. The left guard 51 is provided on the left side of the press brake body 10 so as to cover an open area provided in the left side plate 11 of the press brake body 10. The right guard 52 is provided on the right side of the press brake body 10 so as to cover an open area provided in the right side plate 12 of the press brake body 10.

[0025] The rear guard 53 is disposed behind the press brake body 10, specifically behind the backgauge 30, and is provided so as to cover the open area between the left and right side plates 11, 12. The rear guard 53 includes a base panel 54 with an opening 55 in the center, and left and right doors 56, 57 for opening and closing the opening 55. As shown in FIG. 3 , the length L from the bottom end of the base panel 54 to the bottom end of the opening 55 is designed on the assumption that a worker will straddle the guard 50 to enter during maintenance work. Specifically, it is set to be approximately the same height as the support frame 21 on which the backgauge 30 is mounted.

[0026] As shown in FIG. 2 , the left door 56 is a sliding door made of two panels and covers the left half of the opening 55. By moving the left door 56 to an open position on the left side, the left half of the opening 55 can be opened. The right door 57 is a sliding door made of two panels and covers the right half of the opening 55. By moving the right door 57 to an open position on the right side, the right half of the opening 55 can be opened. The opening 55 can be opened or closed by moving one or both of the left and right doors 56 and 57. When one or both of the left and right doors 56 and 57 are in the open position, the restriction on the opening 55 is released. Even when a worker is outside the guard 50, they can access the inside of the guard 50 by inserting their upper limbs through the opening 55. In other words, the opening 55 corresponds to an access area for the worker to access the inside of the guard 50. The size of the opening 55 can be increased by making the left and right doors 56, 57 sliding doors made up of two panels.

[0027] The control device 100 controls the operation of the press brake main body 10 and the backgage 30. The control device 100 is a computer such as an NC (Numerical Control) device. The computer is mainly composed of a hardware processor such as a CPU (Central Processing Unit), a memory, and various interfaces. The memory and various interfaces are connected to the hardware processor via a bus.

[0028] A predetermined computer program is installed in the computer, and the computer executes the functions of the control device 100 by the hardware processor executing the computer program.

[0029] In this embodiment, the control device 100 controls the left and right table driving devices 19, 20 to control the vertical movement of the upper table 14. The control device 100 also controls the Y-axis and Z-axis actuators 34, 37 to control the front-rear and vertical positions of the left and right abutments 42a, 42b.

[0030] 2, sensors 26 are provided on the left and right doors 56, 57 of the rear guard 53. A detection signal from the sensors 26 is input to the control device 100. The sensors 26 detect that one or both of the left and right doors 56, 57 have moved from the closed position, i.e., that one or both of the left and right doors 56, 57 have been opened. Based on the detection signal from the sensors 26, the control device 100 can determine that one or both of the left and right doors 56, 57 have been opened, i.e., that the restriction of the guard 50 on the opening 55 has been released.

[0031] When performing bending using a press brake 1 configured as described above, an operator stands in front of the press brake main body 10, inserts a workpiece from front to rear into the space between the lower table 13 and the upper table 14, and places the workpiece on the lower die 17 attached to the lower table 13. At this time, the operator positions the workpiece by abutting the rear edge of the workpiece against the butts 42a and 42b of the backgauge 30 so that the bend line of the workpiece coincides with the bending position of the press brake main body 10. Then, upon receiving a trigger from the operator, the control device 100 lowers the upper table 14 toward the lower table 13. As a result, the workpiece is pressed between the lower die 17 and the upper die 18, and the workpiece is bent at the desired bend angle around the bend line.

[0032] A method for adjusting the positions of the abutments 42a, 42b according to this embodiment will be described below with reference to FIGS. 5 to 9. In this description, it is assumed that after a first bending operation has been performed on a workpiece, the positions of the left and right abutments 42a, 42b are adjusted to match the second bending operation. Therefore, the left and right abutments 42a, 42b are currently located at positions corresponding to the first bending operation. Also, as shown in FIG. 5, the left and right doors 56, 57 of the rear guard 53 are located in their closed positions, and the opening 55 is closed.

[0033] 6, the control device 100 moves the left and right butts 42a, 42b rearward from the previous (first) processing position by controlling the Y-axis actuator 34. Specifically, the control device 100 moves the left and right butts 42a, 42b to the retracted position located at the rearmost position within the movable range of the butts 42a, 42b.

[0034] As shown in Figure 7, when the left and right abutments 42a, 42b have moved to the retracted positions, the worker stands behind the rear guard 53 and moves the left and right doors 56, 57 to the open position. When the left and right doors 56, 57 have moved to the open position, the sensor 26 outputs a detection signal indicating that the left and right doors 56, 57 are in the open state. When the control device 100 determines that the left and right doors 56, 57 have been opened based on the control signal, it brings the press brake 1 to an emergency stop.

[0035] As shown in FIG. 8 , a worker behind the rear guard 53 can access the inside of the guard 50 by inserting his or her upper limbs through the opening 55 and adjust the left-right positions of the left and right butts 42a, 42b. At this time, because the worker 55 can access the inside of the guard 50 through the opening 55, the worker can adjust the positions of the left and right butts 42a, 42b even when the worker is outside the guard 50. In addition, because the left and right butts 42a, 42b have been moved to the retracted positions in advance, they are close to the rear guard 53. This places the left and right butts 42a, 42b within the reach of the worker's upper limbs, allowing the worker to adjust the positions of the left and right butts 42a, 42b in a comfortable position.

[0036] After completing the position adjustment of the left and right butts 42a, 42b, the worker moves the left and right doors 56, 57 to their respective closed positions, as shown in FIG. 9. This closes the opening 55 with the left and right doors 56, 57. A detection signal indicating the closed state of the doors 56, 57 is input from the sensor 26 to the control device 100. When the control device 100 determines based on the control signal that the left and right doors 56, 57 are closed, it returns the press brake 1 to the operating state. Furthermore, the control device 100 controls the Y-axis actuator 34 to move the left and right butts 42a, 42b forward in accordance with the current (second) processing position, thereby positioning the left and right butts 42a, 42b at predetermined positions in the front-to-rear direction.

[0037] Through the above series of steps, the left and right abutments 42a, 42b are appropriately positioned in positions appropriate for the second bending process.

[0038] Thus, the method for adjusting the butts in this embodiment includes a first step of moving the left and right butts 42a, 42b rearward by operating the Y-axis actuator 34, and a second step of adjusting the positions of the butts 42a, 42b in the left-right direction by manually moving the left and right butts 42a, 42b in the left-right direction from the access area where the guard 50 is released.

[0039] According to this method, the worker 55 can access the inside of the guard 50 from the access area, and can adjust the positions of the left and right butts 42a, 42b even while the worker is outside the guard 50. Furthermore, the left and right butts 42a, 42b have moved rearward, and are therefore closer to the rear guard 53. This places the left and right butts 42a, 42b within the reach of the worker's upper limbs, allowing the worker to adjust the positions of the left and right butts 42a, 42b in a comfortable position. Therefore, the adjustment of the left and right butts 42a, 42b can be performed quickly, reducing the burden on the worker.

[0040] In the method for adjusting abutment of this embodiment, the second step further includes removing the restriction in the access area.

[0041] According to this method, the access area remains restricted when the left and right butts 42a, 42b are not being adjusted, thereby improving the safety of the press brake 1. Furthermore, by releasing the restriction on the access area, the worker can properly enter the inside of the guard 50, and the worker can adjust the left and right butts 42a, 42b from the access area.

[0042] In the method for adjusting abutment according to this embodiment, the guard 50 has an opening 55, which is an access area, and left and right doors 56, 57 for opening and closing the opening 55. In this case, the step of releasing the restriction on the access area is to move the left and right doors 56, 57 to open the opening 55.

[0043] According to this method, by opening the opening 55, it is possible to access the inside of the guard 50 through the opening 55. This allows the worker to easily adjust the positions of the left and right abutments 42a, 42b even if the worker is outside the guard 50.

[0044] The method for adjusting the butting position of this embodiment further includes a third step of bringing the press brake 1 to an emergency stop when the restriction on the opening 55 (access area) is released.

[0045] According to this method, the press brake 1 is brought to an emergency stop when access to the inside of the guard 50 becomes possible through the opening 55. This ensures safety when an operator manually moves the left and right butts 42a, 42b.

[0046] In the method for adjusting the abutment of this embodiment, the guard 50 is provided with a sensor 26 that detects movement of the left and right doors 56, 57. The third step includes determining that the restriction on the access area has been released when the sensor 26 detects movement of the left and right doors 56.

[0047] According to this method, by referring to the detection result of the sensor 26, it is possible to accurately detect that the restriction on the access area has been lifted.

[0048] In the butting adjustment method of this embodiment, the guard 50 includes a right guard 52 provided on the right side of the press brake body 10, a left guard 51 provided on the left side of the press brake body 10, and a rear guard 53 provided behind the press brake body 10. The opening 55 is provided in the rear guard 53.

[0049] According to this method, the opening 55 is provided in the rear guard 53 located on the side where the butts 42a, 42b are moved by the Y-axis actuator 34, so the worker can operate the butts 42a, 42b from a position close to them. This allows the worker to easily adjust the positions of the left and right butts 42a, 42b in a comfortable position.

[0050] In the method for adjusting the abutments of this embodiment, the first step is to move the left and right abutments 42a, 42b to the retreat positions located at the rearmost positions within the movable ranges of the left and right abutments 42a, 42b.

[0051] According to this method, the abutments 42a, 42b are moved to positions close to the worker, so the worker can easily operate the left and right abutments 42a, 42b.

[0052] The press brake 1 of this embodiment also includes a press brake body 10 that bends a workpiece along a bending line extending in the left-right direction, a backgauge 30 that is disposed behind the press brake body 10 and has left and right butts 42a, 42b that position the workpiece by being butted against the edges of the workpiece, a guard 50 that is provided to surround the rear area of ​​the press brake body 10 including the backgauge 30 and restricts entry into the rear area, and a control device 100. The control device 100 brings the press brake body 10 to an emergency stop when it determines that the butts 42a, 42b have moved rearward to positions where they can be operated by an operator outside the guard and that the restriction of the guard 50 has been released in an access area accessible to the operator.

[0053] With this configuration, the worker 55 can access the inside of the guard 50 from the access area, so that the worker can adjust the left-right positions of the left and right butts 42a, 42b even when the worker is outside the guard 50. Furthermore, the left and right butts 42a, 42b have moved rearward, so that they are closer to the rear guard 53. This places the left and right butts 42a, 42b within the reach of the worker's upper limbs, so the worker can adjust the positions of the left and right butts 42a, 42b in a comfortable position. Therefore, the adjustment of the butts 42a, 42b can be performed quickly, reducing the burden on the worker.

[0054] In the press brake 1 of this embodiment, the guard 50 has an opening 55 which is an access area, and left and right doors 56, 57 which open and close the opening 55. The restriction of the guard 50 is released by moving the left and right doors 56, 57 to open the opening 55.

[0055] According to this configuration, the opening 55 can be opened, so that the worker can access the inside of the guard 50 through the opening 55 even when the worker is outside the guard 50. This allows the worker to easily adjust the positions of the left and right abutments 42a, 42b.

[0056] In the press brake 1 of this embodiment, the card 50 is equipped with a sensor 26 that detects movement of the left and right doors 56, 57. When the sensor 26 detects movement of the left and right doors 56, 57, the control device 100 determines that the guard restriction has been released.

[0057] According to this configuration, by referring to the detection result of the sensor 26, it is possible to accurately detect that the restriction on the access area has been lifted.

[0058] In the press brake 1 of this embodiment, the guard 50 includes a left guard 51 provided on the left side of the press brake body 10, a right guard 52 provided on the right side of the press brake body 10, and a rear guard 53 provided behind the press brake body 10. The opening 55 is provided in the rear guard 53.

[0059] According to this configuration, the opening 55 is provided in the rear guard 53 located on the side where the butts 42a, 42b are moved by the Y-axis actuator 34, so the operator can operate the butts 42a, 42b from a position close to the butts 42a, 42b. This allows the operator to easily adjust the positions of the left and right butts 42a, 42b in a comfortable position.

[0060] In the press brake 1 of this embodiment, the backgage 30 further includes an X-axis beam 40 extending in the left-right direction. The abutments 42a and 42b are disposed on the X-axis beam 40 so as to be slidable in the left-right direction.

[0061] According to this configuration, the worker can manually move the abutments 42a and 42b.

[0062] In the press brake 1 of this embodiment, the backgage 30 further includes a Y-axis actuator 34 that moves the X-axis beam 40 in the front-to-rear direction. The control device 100 controls the Y-axis actuator 34 to move the stoppers 42a, 42b rearward through the opening 55 to positions where the worker can operate the stoppers 42a, 42b.

[0063] According to this configuration, the rearward movement of the abutments 42a, 42b is achieved by the Y-axis actuator 34. This allows the abutments 42a, 42b to be automatically moved to positions where an operator can operate them.

[0064] In the press brake 1 of this embodiment, the left and right doors 56, 57 are configured to be slidable in the left-right direction.

[0065] With this configuration, the left and right doors 56, 57 can be moved in parallel with the rear guard 53. Therefore, compared to a method in which the doors move back and forth like a swing door, it is possible to suppress rearward protrusion when opening the opening 55. This allows the device to be made more compact.

[0066] In this embodiment, left and right doors 56, 57 of a double-swing type are exemplified as the door that regulates opening 55. However, as shown in Fig. 10, the door that regulates opening 55 may be a single-swing door 58. Also, in this embodiment, the door that regulates opening 55 is a type that slides left and right, but the door that regulates opening 55 may be a type that slides up and down.

[0067] In addition, in this embodiment, the opening 55 provided in the rear guard 53 is exemplified as the access area. However, the access area is not limited to this as long as the operator can operate the stoppers 42a, 42b from outside the guard 50. In addition, although this embodiment exemplified a physical panel as the guard 50, the guard 50 may be configured to restrict entry using light rays.

[0068] In this embodiment, the left and right abutments 42a, 42b are manually moved by an operator. As a manual movement method, it is assumed that the operator moves the abutments 42a, 42b by directly touching them with their hands, but the operator may also move the abutments 42a, 42b by holding a tool such as a stick and hitting the tool against the abutments 42a, 42b.

[0069] Although the embodiments of the present invention have been described above, the descriptions and drawings that form part of this disclosure should not be understood to limit the present invention. Various alternative embodiments, examples, and operating techniques will become apparent to those skilled in the art from this disclosure. [Explanation of symbols]

[0070] 1. Press brake 10 Press brake body 11, 12 Side plates 13 Lower table 14 Upper table 19, 20 Table drive device 26 sensors 30 backgauge 34 Y-axis actuator 37 Z-axis actuator 40 X-axis beam 42a, 42b butt 50 Guard 51 Left Guard 52 Right Guard 53 Rear guard 54 Base Panel 55 Opening Doors 56 and 57 100 control device

Claims

1. a press brake body that bends a workpiece along a bending line extending in the left-right direction; a back gauge disposed behind the press brake body, the back gauge having a stop against which an edge of the workpiece is stopped to position the workpiece; A method for adjusting a butt position in a press brake comprising: a guard provided to surround a rear area of ​​the press brake body including the back gauge and restricting entry into the rear area; a first step of moving the abutment rearward by operating an actuator; a second step in which an operator outside the guard manually moves the stopper in the left-right direction from an access area where the guard is released, thereby adjusting the position of the stopper in the left-right direction; How to adjust the stop, including:

2. the second step further includes an operator removing restrictions in the access area. The method for adjusting abutment according to claim 1.

3. Further provided is a third step of emergency stopping the press brake when the restriction in the access area is released. The method for adjusting abutment according to claim 2.

4. The guard includes an opening that is the access area and a movable door that opens and closes the opening, The step of releasing the restriction in the access area is performed by the worker moving the door to open the opening. The method for adjusting abutment according to claim 3.

5. The guard includes a sensor that detects movement of the door. The third step includes determining that restriction in the access area has been released when the movement of the door is detected by the sensor. The method for adjusting abutment according to claim 4.

6. The guards include a right guard provided on the right side of the press brake body, a left guard provided on the left side of the press brake body, and a rear guard provided behind the press brake body, The opening is provided in the rear guard. The method for adjusting abutment according to claim 4.

7. The first step moves the abutment to a retreat position located at the rearmost position within a movable range. The method for adjusting abutment according to claim 1.

8. a press brake body that bends a workpiece along a bending line extending in the left-right direction; a back gauge disposed behind the press brake body, the back gauge having a stop against which an edge of the workpiece is stopped to position the workpiece; a guard provided to surround a rear area of ​​the press brake body including the back gauge and restricting entry into the rear area; a control device; The control device When it is determined that the stop has moved rearward to a position where it can be operated by an operator outside the guard and that the restriction of the guard has been released in an access area accessible to the operator, the press brake main body is brought to an emergency stop. Press brake.

9. The guard includes an opening that is the access area and a movable door that opens and closes the opening, The restriction of the guard is released when the worker moves the door to open the opening.

9. The press brake according to claim 8.

10. The guard includes a sensor that detects movement of the door. The control device determines that the restriction of the guard has been released when the movement of the door is detected by the sensor.

10. The press brake according to claim 9.

11. The guards include a left guard provided on the left side of the press brake body, a right guard provided on the right side of the press brake body, and a rear guard provided behind the press brake body, The opening is provided in the rear guard.

10. The press brake according to claim 9.

12. The back gauge further includes a beam extending in the left-right direction, The abutment is disposed on the beam so as to be slidable in the left-right direction.

10. The press brake according to claim 9.

13. The back gauge further includes an actuator that moves the beam in a forward and backward direction, The control device By controlling the actuator, the stop is moved rearward from the opening to a position where the worker can operate the stop.

13. The press brake of claim 12.

14. The door is configured to be slidable along the left-right direction.

10. The press brake according to claim 9.

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