JP5932351B2 - Press brake - Google Patents

Description

  The present invention relates to a press brake of a type in which an upper table (ram) moves up and down, and more specifically, a press brake having a position detector main body for detecting a vertical movement position of the ram separated from a detection plate. About.

  As is well known, the press brake has C-shaped left and right side frames, and a lower table for supporting the lower mold is provided on the lower side of the left and right side frames. An upper table (ram) that supports the upper mold is provided on the upper side of the left and right side frames so as to be movable up and down. A C-shaped detection plate having a lower end portion fixed to the lower side of the lower table or the left and right side frames is provided. A position detector such as a linear scale for detecting the moving position is provided (see, for example, Patent Document 1).

JP 2005-319489 A

  The configuration of the press brake described in Patent Document 1 is as shown in FIG. In other words, the press brake 1 includes left and right C-shaped side frames 3L and 3R, and a lower table having a lower mold 5 on the upper side of the left and right side frames 3L and 3R. 7 is provided. An upper table (ram) 11 having an upper mold 9 is provided on the upper side of the side frames 3L and 3R so as to be movable up and down. In order to move the upper table 11 up and down, a vertical operation device 13 such as a hydraulic cylinder is provided above the left and right side frames 3L and 3R.

  In order to detect the vertical movement position of the upper table 11 and the upper mold 9 with respect to the reference position in the vertical direction, a C-shaped detection plate 15 having one end fixed to the lower or lower table 7 of the left and right side frames 3L and 3R. Is provided. A position detector 17 is attached to the upper free end of the detection plate 15. The position detector 17 is composed of, for example, a linear scale, and the position detector main body 19 is vertically attached to the free end of the detection plate 15.

  The detection head 21 in the position detector 17 is provided on a vertical guide portion 23 provided in the position detector main body 19 so as to be movable up and down. The detection head 21 is provided with a contact member 25 whose lower end is in contact with an appropriate upper surface of the upper table 11.

  Accordingly, when the upper table 11 is moved up and down by operating the up-and-down operation device 13, the detection head 21 moves up and down following the up-and-down movement of the upper table 11 via the contact member 25, and the reference position in the up-and-down direction. The position detector 17 can detect the movement position of the upper table 11 from the position.

  By the way, the portion of the detection plate 15 that supports the position detector main body 19 has a large vertical dimension in order to hold the position detector main body 19 vertically. When the vertical dimension is reduced, a bracket for vertically supporting the position detector main body 19 is required. That is, in order to hold the position detector main body 19 vertically, the upper side of the detection plate 15 tends to be heavy. Therefore, vibration is easily generated in the detection plate 15, and further improvement has been desired.

The present invention has been made in view of the above-described problems. An upper table having an upper mold is provided on the upper side of the left and right side frames so as to be movable up and down, and the lower table is provided below the left and right side frames. A press brake comprising a lower table having a mold, wherein a lower part of a detection plate supporting a position detector body for detecting a vertical movement position of the upper table is attached to the lower part of the side frame or the lower table; ,
The position detector includes a detection head that is movable up and down in a vertical guide portion provided in a position detector main body of the position detector, and a contact member that contacts the upper surface of the upper table. Configuration,
A support bracket provided on the side frame is provided to support the position detector body in a vertical state and freely move up and down,
The contact member provided in the detection head is in contact with the upper surface of the upper table, and the position detector main body is contacted with the upper surface of the detection plate, and the weight of the position detector main body is determined by the detection plate. It is the structure supported by.

  In the press brake, the position detector main body is biased downward by a biasing means.

  According to the present invention, the position detector main body is held vertically by the support bracket provided on the side frame, and the detection plate supports only the position detector main body. The weight can be reduced, and it is difficult to be affected by the vibration of the press brake.

It is side sectional explanatory drawing which shows the structure of the principal part of the press brake which concerns on embodiment of this invention. It is side sectional explanatory drawing which showed the structure of the conventional press brake.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Since the overall configuration of a press brake 1A according to an embodiment of the present invention is almost the same as the configuration of the press brake 1, details of the overall configuration are described. Detailed description will be omitted, and the configuration of the main part will be described. In addition, although the structure of the principal part in 1 A of press brakes which concern on embodiment of this invention is demonstrated, the overlapping description is abbreviate | omitted as attaching | subjecting the same code | symbol about the component which show | plays the same function as the structure of the said press brake 1. FIG. I will do it.

  Referring to FIG. 1, a press brake 1A according to an embodiment of the present invention includes left and right side frames 3L, 3R similar to the press brake 1 described above. A lower table (not shown in FIG. 1) having a lower mold is provided on the lower side of the side frames 3L and 3R, and an upper mold 9 is provided on the upper side of the side frames 3L and 3R. An upper table (ram) 11 is provided to be movable up and down. A vertical operation device 13 for moving the upper table 11 up and down is provided on the upper side of the side frames 3L and 3R.

  A position detector 17 is provided to detect a movement position of the upper table 11 from a vertical reference position. More specifically, a support bracket 27 is fixed to the upper portions of the left and right side frames 3L and 3R, and the position detector main body 19 of the position detector 17 can be vertically moved to the support bracket 27. Is provided. That is, the position detector body 19 is formed with a plurality of elongated holes 29 parallel to the longitudinal direction of the position detector body 19, and each elongated hole 29 is fixed to the support bracket 27. The pin 31 is engaged so as to be relatively movable up and down.

  In the configuration in which the position detector body 19 is supported so as to be vertically movable with respect to the support bracket 27, the relationship between the long hole 29 and the guide pin 31 is relative, and the long hole 29 is A configuration may be adopted in which the guide pin 31 is provided in the detector main body 19 by being formed in the support bracket 27. Moreover, the structure provided with the linear guide may be sufficient.

  The position detector body 19 is always urged downward by an elastic member 35 such as a spring mounted between the spring seat 33 provided on the support bracket 27 and the position detector body 19. The position detector main body 19 is supported in contact with the upper surface of the upper free end 15E of the detection plate 15. Therefore, the load acting on the free end 15E of the detection plate 15 is the weight of the position detector main body 19 in the position detector 17 and the downward biasing force of the elastic member 35. When the free end portion 15E is finely moved in the horizontal direction, the free end portion 15E is slightly moved relative to the position detector main body 19.

  In the configuration as described above, after placing and positioning the plate-like workpiece on the lower mold 5, when the ram 11 is lowered by operating the vertical operation device 13, the upper mold 9 and the lower mold 5 provided in the ram 11 are The workpiece is bent by the cooperation. When the ram 11 is lowered as described above, the detection head 21 in the position detector 17 is lowered at the same time, so that the moving positions of the ram 11 and the upper die 9 from the reference position in the vertical direction can be detected, and the lower die 5 and the upper die 9 are detected. The workpiece can be bent while accurately maintaining the gap dimension.

  As described above, when the workpiece is bent, the position detector main body 19 of the position detector 17 is supported by the free end portion 15E of the detection plate 15, and the free end portion 15E and the position detector. The main body 19 can be finely moved in the relatively horizontal direction. Therefore, even if the detection plate 15 receives horizontal vibration, no vibration is applied to the position detector main body 19. Therefore, the vertical movement position of the ram 11 can be detected more accurately.

  In addition, with the above configuration, the vertical dimension of the detection plate 15 can be shortened as compared with the conventional configuration, and the upper side can be reduced in weight, thereby suppressing vibration more effectively. it can.

1A Press brake 3L, 3R Side frame 5 Lower mold 7 Lower table 9 Upper mold 11 Upper table (ram)
DESCRIPTION OF SYMBOLS 15 Detection board 15E Free end part 17 Position detector 19 Position detector main body 21 Detection head 25 Contact member 27 Support bracket 29 Long hole 31 Guide pin 33 Spring seat 35 Elastic member

Claims (2)

An upper table having an upper mold is provided on the upper side of the left and right side frames to be movable up and down, and a lower table having a lower mold is provided on the lower side of the left and right side frames, and the vertical movement position of the upper table A press brake in which a lower part of a detection plate that supports a position detector main body for detecting a position is attached to a lower part of the side frame or the lower table,
The position detector includes a detection head that is movable up and down in a vertical guide portion provided in a position detector main body of the position detector, and a contact member that contacts the upper surface of the upper table. Configuration,
A support bracket provided on the side frame is provided to support the position detector body in a vertical state and freely move up and down,
The contact member provided in the detection head is in contact with the upper surface of the upper table, and the position detector main body is contacted with the upper surface of the detection plate, and the weight of the position detector main body is determined by the detection plate. A press brake characterized by having a structure supported by the above.   2. The press brake according to claim 1, wherein the position detector body is biased downward by a biasing means.

Images