| 摘要 |
PURPOSE:To obtain up and down equal-form bevel type grooves by detecting the top and bottom faces of a workpiece with copying rolls and enabling the vertically central position of a hourglass cutter head to be vertically moved by half the varying quantity of a board thickness, in the captioned device for bevel type welding grooves. CONSTITUTION:Plural lower part copying rolls 15 which are brought in contact with the bottom face of a steel plate 1, are supported by a lower part frame 16, and plural copying rolls 17 which copy the top face of the steel plate 1, are supported by an upper part frame 18, and an up-down symmetrical link mechanism 22 is mounted on the both frames 18, 16 with a common fulcrum 21 as a center. A cuter frame 19 is supported by this common fulcrum 21. Thereby, a cutter head 8 is always positioned in the middle of the board thickness of the steel plate 1, being followingly displaced by 1/2 by the quantity of vertical displacement of the upper part frame 18 due to variation in board thickness. Thereby, up and down equal-form bevel type grooves can be obtained by this construction. |
