JP5848908B2 - Shutter device and press brake - Google Patents

Description

The present invention relates to a press brake provided with an automatic die-changer, and more particularly, Resid can perform automatic mold exchanging operation of die autochanger having a press brake safety Yatta The present invention relates to a device and a press brake.

  Conventionally, a press brake is used as a bending machine for bending a plate-like workpiece. In order to automate the bending process of the workpiece and improve the efficiency of the bending process, the press brake is provided with an automatic die changer having various configurations (see, for example, Patent Documents 1, 2, and 3). .

JP-A-60-213317 Japanese Patent Laid-Open No. 7-275941 JP 2000-71028 A

  In the inventions described in Patent Documents 1 to 3, the upper mold and the lower mold can be attached and detached by the automatic mold changer with respect to the upper mold mounting section and the lower mold mounting section of the upper table in the press brake. When the operation is performed, the front sides of the upper mold mounting part and the lower mold mounting part are in an open state. Therefore, when the workpiece is bent by manually supplying the workpiece between the upper and lower molds after the upper and lower molds are automatically replaced and set up, the workpiece supply and folding are efficiently performed. Bending can be performed. However, when the upper and lower molds are automatically exchanged, an operator may approach the mold exchange area and a part of the worker's body may enter the mold exchange area. Therefore, further improvement in safety is desired.

The present invention has been made in view of the conventional problems as described above, and is a shutter device capable of opening and closing the front side of the upper mold mounting portion of the upper table and the lower mold mounting portion of the lower table in the press brake. The left and right guide members are long in the vertical direction corresponding to the left and right side frames, and can be moved up and down along the left and right guide members, and the upper mold mounting portion of the upper table and the lower mold mounting of the lower table in the press brake The left and right guide members are inclined in the backward direction so that the upper side is close to the upper table .

Further, in the shutter device, the shutter is configured to have a “U” shape in which a central portion in the left-right direction is close to the press brake side when seen in a plan view.

  The shutter device may further include a closed state monitoring unit that monitors whether the shutter is in a state where the front side of the upper mold mounting part and the lower mold mounting part is closed. .

  Further, in the shutter device, a rotating body is rotatably provided at an upper part and a lower part of the left and right guide members, and both left and right sides of the shutter are connected to one side of the left and right endless members that are hung on the upper and lower rotating bodies. And a balancer is provided on the other side of the endless member.

  Further, in the shutter device, an electromagnetic brake is interlocked and connected to at least one of the rotating bodies.

  In the shutter device, a handle for moving the shutter up and down is provided in the shutter, and a switch means for controlling ON and OFF of the electromagnetic brake is provided in the handle. is there.

Further, the press brake includes an automatic die changer for automatically attaching and detaching the upper and lower dies to the upper die attachment portion of the upper table and the lower die attachment portion of the lower table. And a shutter device having a shutter that can freely open and close the front side of the upper mold mounting portion and the lower mold mounting portion , wherein the upper side of the left and right guide members that guide the shutter in the vertical direction is the upper table. The guide member is inclined backward so as to be close to each other, and the shutter is configured to have a “U” shape with a central portion in the left-right direction close to the press brake side when seen in a plan view. It is characterized by.

  According to the present invention, when the front side of the upper mold mounting part of the upper table and the lower mold mounting part of the lower table in the press brake are closed by the shutter of the shutter device, the automatic mold replacement provided in the press brake is performed. The upper and lower molds are automatically changed by the device. Therefore, when the automatic mold changing apparatus is performing the automatic mold changing operation, it is possible to prevent a part of the worker's body from entering the mold changing area by the shutter. Therefore, safety can be improved and the conventional problems as described above can be solved.

1 is an explanatory perspective view schematically showing an overall configuration of a press brake according to an embodiment of the present invention. It is left side explanatory drawing which shows the structure of the principal part of the press brake which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is left side explanatory drawing which shows the structure of the principal part of the press brake which concerns on embodiment of this invention, and has shown in the state which the shutter in a shutter apparatus raised. It is a perspective view which shows the structure of the principal part, and has shown it in one part cross section.

  Referring to FIG. 1, a press brake 1 according to an embodiment of the present invention includes C-shaped left and right side frames 3L, 3R, as in a general press brake, and the side frames 3L, 3R An upper table (ram) 5 that is moved up and down by a vertical operation device (not shown) provided in the side frames 3L and 3R is provided in the upper part so as to be movable up and down. A lower table 7 is provided below the side frames 3L and 3R so as to face the upper table 5 in the vertical direction. On the lower side of the upper table 5, there is provided an upper mold mounting portion 5A for detachably mounting an upper mold (not shown in FIG. 1). A lower mold mounting portion 7A for detachably mounting a lower mold (not illustrated in FIG. 1) for bending a plate-like workpiece (not illustrated) in cooperation with the upper mold is provided. .

  On one side of the press brake 1 in the left-right direction, a plurality of upper molds and lower molds that are attached to and detached from the upper mold mounting part 5A of the upper table 5 and the lower mold mounting part 7A of the lower table 7 are stored. A mold storage device 9 is arranged. Then, in order to exchange the upper mold 11 (see FIG. 2) between the mold storage apparatus 9 and the upper mold mounting portion 5A of the upper table 5, the mold storage apparatus 9 and the lower table are also exchanged. In order to attach and detach the lower mold 13 to and from the lower mold mounting portion 7A, an automatic mold changing device 15 is provided.

  The mold storage device 9 and the automatic mold changer 15 are already well-known configurations. Therefore, a detailed description of the configuration and operation of the mold storage device 9 will be omitted. The automatic mold changer 15 has a publicly known structure, but will be described briefly. The automatic mold changer 15 exchanges the upper mold 11 with respect to the upper mold mounting portion 5A of the upper table 5. An upper mold exchanging device 17U for performing, and a lower mold exchanging device 17L for exchanging the lower mold 13 with respect to the lower mold mounting portion 7A of the lower table 7 are provided.

  The upper mold exchanging device 17U is guided by an upper guide rail 19U which is provided on the rear side of the upper table 5 and on the upper front side of the side frames 3L and 3R and which is long in the left-right direction (direction perpendicular to the paper surface in FIG. 2). It is provided to be movable in the left-right direction. The lower mold exchanging device 17L is guided by a left and right lower guide rail 19L provided on the rear side of the lower table 7 so as to be movable in the left and right directions. The right end sides of the upper and lower guide rails 19U and 19L extend into the mold storage device 9.

  Therefore, the upper and lower mold exchanging devices 17U and 17L are located between the positions corresponding to the upper mold mounting portion 5A of the upper table 5 and the lower mold mounting portion 7A of the lower table 7 and the interior of the mold storage device 9. The upper mold 11 and the lower mold 13 stored in the mold storage device 9 can be attached to and detached from the upper mold mounting part 5A and the lower mold mounting part 7A. is there.

  As described above, when the upper and lower mold exchanging devices 17U and 17L reciprocate in the left-right direction and the upper and lower molds 11 and 13 are exchanged, the operator's hand, for example, is placed between the upper and lower tables 5 and 7. If positioned, there is a risk that the upper and lower molds 11 and 13 to be attached and detached will interfere with hands. Therefore, the present invention has been made to prevent the above danger.

  In order to prevent such danger as described above, a shutter device 21 is provided which can open and close the front side of the upper mold mounting portion 5A of the upper table 5 and the lower mold mounting portion 7A of the lower table 7. More specifically, left and right guide members 23L and 23R are provided long in the vertical direction corresponding to the side frames 3L and 3R in the press brake 1. The left and right guide members 23L, 23R are supported by support brackets (not shown) provided on the front sides of the left and right sides of the lower table 7, and the upper side is the upper table 5 as shown in FIGS. It is inclined so as to be close to. That is, the left and right guide members 23L and 23R are inclined upward in the rearward direction (leftward in FIGS. 2 and 3).

  Rotating bodies 25U and 25L such as pulleys are rotatably provided above and below the left and right guide members 23L and 23R, respectively. Endless members 27L and 27R such as endless chains and timing belts are respectively wound around the upper and lower rotating bodies 25U and 25L of the left and right guide members 23L and 23R. The left and right endless members 27L and 27R are connected to the left and right sides of a shutter 29 that can open and close the front sides of the upper mold mounting portion 5A and the lower mold mounting portion 7A, respectively. 27R are connected to balancers 31L and 31R that balance the weight of the shutter 29. Note that the lower rotating body 25L of the left and right guide members 23L and 23R is interlocked and connected by an interlocking shaft 33 that is long in the left-right direction.

  Therefore, when the shutter 29 moves up and down along the left and right guide members 23L and 23R, the left and right endless members 27L and 27R rotate synchronously via the interlocking shaft 33. Therefore, the left and right sides of the shutter 29 always move up and down while maintaining the same height.

  The shutter 29 in the shutter device 21 is arranged so that the upper and lower molds 11 and 13 to be exchanged and replaced by an operator's hand when touching the guide members 23L and 23R are not touched. The front mold mounting part 5A of the table 5 and the lower mold mounting part 7A of the lower table 7 are closed in front (front side). And when it descend | falls, it is located below the said lower mold | type mounting part 7A, and the front side (front) of the said upper mold | type mounting part 5A and the lower mold | type mounting part 7A is open | released.

  As described above, when the shutter 29 is moved up and down, the stopper bolts 24U and 24L for restricting the upper limit position and the lowering position of the shutter 29 are provided above and below the guide members 23L and 23R. The stopper bolts 24U and 24L can be adjusted up and down, and have a shock absorber that absorbs an impact when the shutter 29 comes into contact.

  As described above, when the shutter 29 is moved up and down to open and close the front sides of the upper mold mounting portion 5A and the lower mold mounting portion 7A, the shutter 29 rises and the front side of the upper mold mounting portion 5A and the lower mold mounting portion 7A. Closed state monitoring means for monitoring whether or not is in a closed state is provided. That is, in this embodiment, a switch means 35 (see FIG. 2) such as a proximity switch as an example of the closed state monitoring means is provided on at least one of the left and right guide members 23L, 23R. Yes. Further, at least one lower part of the left and right guide members 23L and 23R is provided with a switch means 37 (see FIG. 3) for detecting that the shutter 29 is in a lowered state. The shutter 29 is provided with upper and lower dogs 36U, 36L for operating the switch means 35, 37.

  Therefore, whether the shutter 29 in the shutter device 21 is in the raised state (closed state) or the lowered state (open state) can be detected by the upper and lower switch means 35, 37. is there. Therefore, when the closed state monitoring means (switch means) 35 is in a state in which the closed state is detected, the upper and lower molds are moved by the upper mold changing apparatus 17U and the lower mold changing apparatus 17L in the automatic mold changing apparatus 15. Safety can be improved by attaching and detaching the upper mold 11 and the lower mold 13 to the mounting portions 5A and 7A. That is, when the switch means 35 is operated by the dog 36U provided in the shutter 29 and is in the ON state (or OFF state), the control of the automatic die changer 15 is controlled from the control device (not shown) of the shutter device 21. An operation permission signal is transmitted to the apparatus.

  As described above, when the shutter 29 in the shutter device 21 is lifted and the front sides of the upper mold mounting portion 5A and the lower mold mounting portion 7A are closed, the shutter 29 is prevented from being lowered and lowered. In order to prevent the shutter 29 in the above state from being inadvertently raised, a shutter fixing means is provided. As the configuration of the shutter fixing unit, a lock unit having an appropriate configuration that fixes the shutter 29 in an immovable state when the shutter 29 is raised or lowered can be used. As an example of the shutter fixing means, in this embodiment, an electromagnetic brake (not shown) is provided on at least one of the rotating bodies 25U and 25L.

  Therefore, by maintaining the electromagnetic brake as an example of the shutter fixing means in the ON state in which the brake is operated, the rotation of the rotating bodies 25U and 25L is prevented. Therefore, the shutter 29 is held in the raised state or the lowered state.

  The shutter 29 in the shutter device 21 includes left and right side plates 39L and 39R that move up and down along the left and right guide members 23L and 23R. The side plates 39L, 39R have a width dimension in the front-rear direction (left-right direction in FIG. 2), and the left and right side plates 39L, 39R have left and right center plates 41 that are long in the left-right direction. Side edges are connected together. Therefore, when the shutter 29 is viewed in plan, the center plate 41 has a “U” shape closest to the press brake 1 side. A handle 43 for moving the shutter 29 up and down is provided at the center in the left-right direction of the center plate 41.

  A switch means 45 is provided for controlling ON / OFF of the electromagnetic brake when the handle 43 is held and the shutter 29 is moved up and down. Therefore, the shutter 29 can be easily moved up and down by setting the switch means 45 to the ON state and the electromagnetic brake to the OFF state. Then, the electromagnetic brake is turned on by raising or lowering the shutter 29 to turn on the switch means 35 or 37 and turning off the switch means 45 provided on the handle 43. Therefore, the shutter 29 is fixed in an immovable state that is not moved up and down.

  In the configuration as described above, the automatic mold changer 15 is operated to automatically attach and detach the upper and lower molds 11 and 13 with respect to the upper mold mounting part 5A of the upper table 5 and the lower mold mounting part 7A of the lower table 7. First, the shutter 29 in the shutter device 21 is raised, and the switch means 35 as the closed state monitoring means is turned on. The mold exchanging operation of the mold automatic exchanging device 15 is performed on condition that the switch means 35 is in the ON state. Therefore, when the switch means 35 is turned off during the mold exchanging operation by the automatic mold exchanging apparatus 15, the automatic mold exchanging apparatus 15 is brought to an emergency stop.

  Therefore, when automatic die change is performed by the automatic die changer 15, the front sides (front sides) of the upper and lower die mounting portions 5A and 7A are closed by the shutter 29, which is performed safely. is there. When the shutter 29 is lowered, the electromagnetic brake is in an ON state, and the front sides of the upper and lower mold mounting portions 5A and 7A are in an open state. It is possible to easily supply a plate-shaped workpiece between the two.

  As described above, when the shutter 29 is raised and the front sides of the upper and lower mold mounting portions 5A and 7A are closed, the guide members 23L and 23R are inclined so that the center plate 41 in the shutter 29 is inclined. The gap between the upper part of the press brake 1 and the upper table 5 in the press brake 1 is an extremely small gap, which improves safety. In the state where the shutter 29 is lowered, when the shutter 29 is viewed in a plan view, the operator can approach the center plate 41 between the side plates 39L and 39R by exhibiting a U-shape. The workpiece can be easily supplied and positioned between the molds 11 and 13 manually.

  As understood from the above description, the vertical movement of the shutter 29 relative to the front side of the upper and lower mold mounting portions 5A, 7A grips the handle 43 provided in the shutter 29, and the switch means 45 provided in the handle 43 is moved. Since the electromagnetic clutch provided in conjunction with the rotating body is turned off by turning on, the shutter 29 can be easily moved up and down. When the switch means 45 is turned off by releasing the handle 43, the electromagnetic brake is turned on to perform a braking operation, so that the shutter 29 can be easily fixed.

  By the way, the present invention is not limited to the above-described embodiments, and can be implemented in other forms by making appropriate changes. For example, the shutter device 21 may be provided on the front side of the upper table 5, and the shutter 29 may be lowered from the upper side to close the front sides of the upper and lower mold mounting portions 5A and 7A. Further, it is possible to take a safety measure by retrofitting a shutter device 21 on the front side of a conventional general press brake.

1 Press brake 3L, 3R Side frame 5 Upper table (ram)
5A Upper mold mounting part 7 Lower table 7A Lower mold mounting part 9 Mold storage device 11 Upper mold 13 Lower mold 15 Automatic mold changer 17U Upper mold changer 17L Lower mold changer 21 Shutter unit 23L, 23R 25U, 25L Rotating body 27L, 27R Endless member 29 Shutter 31L, 31R Balancer 33 Interlocking shaft 35 Switch means (closed state monitoring means)
37, 45 Switch means 41 Center plate 43 Handle

Claims (7)

A shutter device that can freely open and close the upper mold mounting portion of the upper table and the lower mold mounting portion of the lower table in the press brake, and the left and right guide members are elongated in the vertical direction corresponding to the left and right side frames in the press brake. Provided with a shutter that can be moved up and down along the left and right guide members and that can open and close the upper mold mounting portion of the upper table and the lower mold mounting portion of the lower table in the press brake. The shutter device is tilted rearward so that the upper side is close to the upper table . 2. The shutter device according to claim 1, wherein the shutter is configured to have a “U” shape in which a central portion in a left-right direction is close to a press brake side when seen in a plan view. 3. The shutter device according to claim 1 , further comprising a closed state monitoring unit that monitors whether or not the shutter is in a state where front sides of the upper mold mounting part and the lower mold mounting part are closed. A shutter device. A shutter device that can freely open and close the upper mold mounting portion of the upper table and the lower mold mounting portion of the lower table in the press brake, and the left and right guide members are elongated in the vertical direction corresponding to the left and right side frames in the press brake. Provided with a shutter that can move up and down along the left and right guide members and that can open and close the upper mold mounting portion of the upper table and the lower mold mounting portion of the lower table in the press brake, and the upper portion of the left and right guide members The rotating body is rotatably provided in the lower part, the left and right sides of the shutter are connected to one side of the left and right endless members wound around the upper and lower rotating bodies, and the balancer is provided on the other side of the endless member. A shutter device characterized by that.   5. The shutter device according to claim 4, wherein an electromagnetic brake is interlocked and connected to at least one of the rotating bodies.   6. The shutter device according to claim 5, wherein a handle for moving the shutter up and down is provided in the shutter, and a switch means for controlling ON and OFF of the electromagnetic brake is provided in the handle. Shutter device. A press brake equipped with an automatic mold changer for automatically attaching and detaching the upper mold and the lower mold to the upper mold mounting part of the upper table and the lower mold mounting part of the lower table in the press brake, A shutter device having a shutter that can freely open and close the front side of the upper mold mounting portion and the lower mold mounting portion is provided , and in the shutter device, upper sides of left and right guide members that guide the shutter in the vertical direction are close to the upper table. As described above, the guide member is provided so as to be inclined rearward, and the shutter is configured to exhibit a “U” shape in which a central portion in the left-right direction is close to the press brake side when seen in a plan view. Press brake.