JP6167013B2 - Press brake - Google Patents

Description

  The present invention relates to a press brake, and more particularly to a press brake having angle sensors on both front and rear sides of a lower table provided with a lower mold so as to be movable and positionable in the left and right directions.

  The press brake includes a lower table provided at the front lower portion of the left and right side frames and an upper table facing the upper and lower sides at the front upper portion of the side frame. Then, when a plate-shaped workpiece is bent into a V shape by the lower die (die) provided on the lower table and the upper die (punch) provided on the upper table, it is moved and positioned in the lateral direction on both the front and rear sides of the lower table. The bending angle of the workpiece is detected by a freely provided angle sensor (see, for example, Patent Documents 1 and 2).

JP 2006-205256 A Japanese Patent No. 3797718

  Patent Document 1 describes that angle sensors are provided on both the front and rear sides of the lower table, and each angle sensor is individually moved and positioned in the left-right direction. However, there is no description of a configuration for individually moving and positioning each angle sensor in the left-right direction.

  Patent Document 2 describes a configuration in which a plurality of angle sensors are provided on both the front and rear sides of a lower table so as to be movable and positioned in the left-right direction. In addition, it is described that the angle sensors that are paired in front and rear are moved synchronously by one servomotor. However, a plurality of timing belts for moving each angle sensor in the left-right direction are arranged in steps in the up-and-down direction, and there is a problem in saving space and simplifying the overall configuration.

  The present invention has been made in view of the above-described problems, and includes an angle sensor for detecting a bending angle of a workpiece on both the front and rear sides of a lower table having a lower mold for bending a plate-shaped workpiece. A plurality of bending angle detection units, each of which is provided with a plurality of bending angles that can be moved and positioned in the left-right direction. A plurality of second pulleys provided on both the front and rear sides of the lower table on the inner side in the left-right direction than the first pulley, and provided with a second endless member. A first connecting bracket having a base end connected to the first endless member between the endless member and the second endless member is connected to one bending angle detection unit. A second connecting bracket having a base end connected to the second endless member between the first and second endless members is connected to the other bending angle detection unit. .

  In the press brake, the base end portions of the first and second connection brackets are arranged at the same height position, and the connection direction of the first connection bracket and the connection direction of the second connection bracket are as follows. It is characterized by being upside down.

  In the press brake, the first and second connecting brackets have the same shape.

  In the press brake, the first pulley is larger in diameter than the second pulley, and the first and second pulleys are provided at the same height position. .

  According to the present invention, the second endless member is disposed inside the first endless member, and the first connection bracket having the base end connected to the first endless member is connected to one angle sensor. Since the second connecting bracket having the base end connected to the second endless member is connected to the other angle sensor, the overall configuration can be saved in space and the configuration can be simplified. is there.

It is side explanatory drawing which showed notionally and schematically the whole structure of the press brake. It is side surface explanatory drawing of the drive system for moving a bending angle detection unit to the left-right direction. It is an isometric view explanatory drawing which shows the relationship between a bending angle detection unit and a lower mold | type. It is front perspective explanatory drawing of the drive system for moving a bending angle detection unit to the left-right direction. It is a back perspective explanatory drawing of the drive system for moving a bending angle detection unit in the left-right direction. It is perspective explanatory drawing of the right side part of a lower table. It is perspective explanatory drawing of the left side part of a lower table.

  Hereinafter, the press brake according to the embodiment of the present invention will be described with reference to the drawings. The overall configuration of the press brake is a well-known configuration. However, in order to facilitate understanding, the overall configuration of the press brake will be described.

  As conceptually and schematically shown in FIG. 1, the press brake 1 includes left and right C-shaped side frames 3L and 3R. The front and lower portions of the side frames 3L and 3R have a left and right direction (X-axis direction). : A lower table 5 that is long in a direction perpendicular to the paper surface in FIG. An upper table 7 that is vertically opposed to the lower table 5 is provided on the front upper portions of the side frames 3L and 3R so as to be movable up and down. A lower die (die) 9 having a V-groove is provided on the upper surface of the lower table 5, and a plate-like workpiece W is bent at the lower portion of the upper table 7 in cooperation with the die 9. An upper die (punch) 11 for processing is provided.

  Therefore, after the workpiece W is placed and positioned on the die 9, the upper table 7 is lowered and the die 9 and the punch 11 are engaged to bend the workpiece W into a V shape. It can be done.

  As described above, the bending angle detection unit 13 including the angle sensor for detecting the bending angle of the workpiece W when the workpiece W is bent into a V shape is provided. More specifically, guide members 15 that are long in the left-right direction are provided on both front and rear sides of the lower table 5. A plurality of bending angle detection units 13 are supported on the front and rear guide members 15 so as to be individually movable in the left-right direction. Since the bending angle detection unit 13 may have a known configuration, a detailed description of the bending angle detection unit 13 is omitted.

  With the above configuration, as described above, when the workpiece W is bent by the cooperation of the upper and lower punches 11 and the die 9, the bending angle of the workpiece W can be detected by the front and rear bending angle detection units 13. Is.

  The structure for attaching the die 9 to the lower table 5 will be described. As shown in FIGS. 2 and 3, a die holder 17 having a die 9 attached to the upper surface is mounted on the upper surface of the lower table 5. 17 is clamped and fixed from the front and rear by a fastening plate 19 detachably attached to the front and rear surfaces of the lower table 5. The fastening plate 19 is fastened by nuts screwed into a plurality of fastening screws 21 penetrating the fastening plate 19. Therefore, the die holder 17 can be attached to and detached from the lower table 5 by loosening the nut.

  A base plate 23 that is long in the left-right direction is horizontally attached to the front end of each of the fastening screws 21 by a plurality of attachment screws 25 (see FIG. 3). The front and rear base plates 23 are horizontally provided with left and right guide members 27 corresponding to the guide members 15. A plurality of bending angle detection units 29 corresponding to the bending angle detection unit 13 are supported on the front and rear guide members 27 so as to be movable in the left and right directions. That is, the bending angle detection unit 29 is integrally supported by a plurality of slide members 31 that are supported by the guide member 27 so as to be movable in the left-right direction.

  Therefore, by individually moving each slide member 31 in the left-right direction along the guide member 27, each bending angle detection unit 29 can be individually moved in the left-right direction. The bending angle detection unit 29 has a configuration including a known angle sensor, and may have the same configuration as the bending angle detection device described in Patent Document 1, for example. Therefore, detailed description of the configuration of the bending angle detection unit 29 is omitted.

  Next, a configuration in which each bending angle detection unit 29 is moved and positioned in the left-right direction along the guide member 27 will be described.

  As shown in FIG. 4, a drive unit 35 is disposed on the right side surface of the lower table 5 via a bracket 33 attached to the rear surface of the lower table 5 (not shown in FIG. 4). A driven unit 39 is arranged on the left side surface of the lower table 5 via a bracket 37 attached to the rear surface of the lower table 5. More specifically, a base bracket 43 is vertically provided on the front end side of each of the brackets 33 and 37 via a plurality of horizontal support pins 41.

  As shown in FIGS. 4 and 5, the first base shaft 43 has a first rotating shaft 45 penetrating horizontally and freely in the front-rear direction. Large first pulleys 47 are respectively provided at both front and rear ends of the first rotating shaft 45. The first rotating shaft 45 is provided with a driven pulley 49. The driven pulley 49 is wound around a driving pulley 53 rotated by a first servo motor 51 mounted on the base bracket 43. The timing belt 55 is hung. Therefore, the first pulley 47 can be rotated forward and backward by rotating the first servomotor 51 forward and backward.

  Further, the base bracket 43 on the right side is provided with a second rotating shaft 59 that is rotated by a second servomotor 57 mounted on the base bracket 43. The second rotary shaft 59 has the same height as the first rotary shaft 45 and penetrates the base bracket 43 horizontally in the front-rear direction inside the first rotary shaft 45 (inner side in the left-right direction). And it is provided so that it can rotate freely. A small-diameter second pulley 61 is provided on both front and rear ends of the second rotating shaft 59.

  The second rotating shaft 59 is provided with a driven pulley 63, and a timing belt 67 that is wound around a driving pulley 65 that is rotated by the second servomotor 57 is wound around the driven pulley 63. It is. Therefore, the second pulley 61 is rotated forward and backward by rotating the second servomotor 57 forward and backward.

  In the base bracket 43 on the left side, a first driven shaft 69 is provided at the same height position as the first rotation shaft 45 so as to pass through in a horizontal and longitudinal direction. A driven pulley 71 having the same diameter as that of the first pulley 47 is provided on the front and rear ends of the first driven shaft 69 so as to face in the left-right direction. A first timing belt 73 as an example of a first endless member is wound around the front and rear driven pulleys 71 and the front and rear first pulleys 47.

  A second driven shaft 75 that horizontally penetrates the left base bracket 43 in the front-rear direction is provided rotatably at a position that is on the inner side of the first driven shaft 69 and at the same height. . A driven pulley 77 having the same diameter as the second pulley 61 is provided on both front and rear ends of the second driven shaft 75. A second timing belt 79 as an example of a second endless member is wound around the front and rear second pulleys 61 and the driven pulleys 77 facing left and right.

  With the above configuration, when the first and second servo motors 51 and 57 are individually rotated forward and backward, the first and second timing belts 73 and 79 are individually rotated forward and backward.

  In order to move the plurality of bending angle detection units 29 supported by the front and rear guide members 27 so as to be movable in the left-right direction, the first bending angle detection unit 29A paired in the front-rear direction has a first Are connected to the first timing belt 73 via a connecting bracket 81 (see FIG. 6). The second bending angle detection unit 29B that forms a pair in the front-rear direction is connected to the second timing belt 79 via a second connection bracket 83 (see FIG. 7).

  The first and second connecting brackets 81 and 83 have the same shape and dimensions, and the base end portions of the first and second connecting brackets 81 and 83 are formed as shown in FIGS. The first and second timing belts 73 and 79 are arranged at the same height in the same space. The first connecting bracket 81 is connected to the first timing belt 73 via a connecting tool 85 provided on the upper surface of the base end portion of the connecting bracket 81. The second connection bracket 83 is connected to the second timing belt 79 via a connection tool 85 having the same configuration provided on the lower surface of the base end portion of the connection bracket 83. That is, the connecting direction of the first and second connecting brackets 81 and 83 is the upside down direction.

  With the above configuration, when the first servo motor 51 is rotated forward and backward, the front and rear first pulleys 47 are rotated forward and backward synchronously. Therefore, the front and rear first timing belts 73 are driven to travel in the same direction in synchronization. Therefore, the first bending angle detection unit 29A connected to the front and rear first timing belts 73 and paired forward and backward moves in the left-right direction in synchronization. Similarly, when the second servomotor 57 is rotated forward and backward, the second bending angle detection unit 29B paired in the front-rear direction moves in the left-right direction in synchronization.

  Therefore, the front and rear first bending angle detection unit 29A and the second bending angle detection unit 29B are individually moved and positioned in the left-right direction corresponding to the punch and die setting position in the press brake and the width dimension in the left-right direction of the workpiece. Is something that can be done.

  As can be understood from the above description, according to the present embodiment, the second endless member on the inner side is located in the region surrounded by the first timing belt 73 that is the first endless member on the outer side. The second timing belt 79 is arranged. Then, the first and second timings are set such that the connecting direction of the first and second connecting brackets 81 and 83 in which the base end portions are disposed between the first and second timing belts 73 and 79 is set upside down. The belts 73 and 79 are individually connected. The first and second connection brackets 81 and 83 are connected to bending angle detection units 29A and 29B that are individually movable in the left-right direction.

  Accordingly, it is possible to save the space for the structure for moving the bending angle detection units 29A and 29B in the left-right direction and to simplify the overall structure.

  In the above configuration, since the first and second connecting brackets 81 and 83 have the same shape and size, manufacturing costs can be reduced, parts management is facilitated, and assembly is easy. It will be.

  By the way, as a configuration in which the inner second timing belt 79 is disposed within the range surrounded by the outer first timing belt 73, a pair of small diameter pulleys 61 are disposed between the pair of large diameter pulleys 71. Thus, the first timing belt 73 is looped around the large-diameter pulley 71, and the second timing belt 79 is looped around the small-diameter pulley 71. Therefore, the belting work of the first and second timing belts 73 and 79 can be performed at the same height position. Therefore, belting work is easy.

  In addition, as a structure which arrange | positions the 2nd timing belt 79 inside the 1st timing belt 73 of the outer side, a small diameter pulley is arrange | positioned, for example in a triangle shape and a square shape, and the 1st, 2nd Alternatively, the timing belts 73 and 79 may have a parallel portion.

9 Lower mold (die)
11 Upper die (punch)
13, 29 Bending angle detection unit 27 Guide member 35 Drive unit 43 Base bracket 45 First rotating shaft 47 First pulley 51 First servo motor 59 Second rotating shaft 61 Second pulley 69 First driven shaft 71, 77 driven pulley 73 first timing belt 75 second driven shaft 79 second timing belt 81 first connection bracket 83 second connection bracket 85 connection tool

Claims (4)

  Multiple bending angle detection units equipped with angle sensors that detect the bending angle of the workpiece on both the front and rear sides of the lower table with the lower mold for bending plate-shaped workpieces can be moved and positioned in the left and right directions, respectively. A press brake provided with a first endless member hung on a plurality of first pulleys rotatably provided on both the left and right sides of the lower table and on both the front and rear sides. A second endless member is provided around a plurality of second pulleys provided on both front and rear sides of the lower table on the inner side in the direction, and a base end portion is provided between the first endless member and the second endless member. A first connection bracket connected to the first endless member is connected to one bending angle detection unit, and a base end portion is provided between the first and second endless members. Press brake, characterized in that it comprises by connecting the second connecting bracket coupled to the second endless member to the other bending angle detecting unit.   2. The press brake according to claim 1, wherein the base end portions of the first and second connection brackets are arranged at the same height position, and the connection direction of the first connection bracket and the second connection bracket are the same. A press brake characterized in that the connecting direction is the upside down direction.   3. The press brake according to claim 1, wherein the first and second connecting brackets have the same shape.   4. The press brake according to claim 1, wherein the first pulley has a larger diameter than the second pulley, and the first and second pulleys are provided at the same height position. Press brake characterized by.

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