| 摘要 |
PURPOSE:To perform machining of a pipe outside circumferential surface by providing three rollers, capable of approaching to and departing from a main spindle, in parallel to the main spindle having an orthogonally crossing arm at its base end part, by supporting the inside circumferential surface of a pipe end with the rollers, and by moving a handle of a support rod fitted on the arm and equipped with a cutting tool forward/rearward. CONSTITUTION:When an end part of a pipe P is placed around a main spindle 1, three rollers 2 parallel to the main spindle 1 are spread by a handle 9 to press an inside circumferential surface of the pipe P. A handle 5 is inserted in an arm 12, which is orthogonally crossing the main spindle 1 and is arranged on the base end part thereof, and is capable of moving forward/rearward by means of a screw 53 to move a cutting tool support rod 4 forward/rearward, which is connected to the handle 5. When an arm 12 is rotated by a grip part 52 of the handle 5, the handle 5 is moved forward/rearward in compliance with a specified pitch of the screw 53 and accordingly a cutting tool 3 is rotated while cutting the outside circumferential surface of the pipe P. In this case, the pipe P is machined while its inside circumferential surface is secured by the rollers 2 of the rotating main spindle 1, and therefore even a long size pipe can be machined on its pipe end outside circumferential surface. |
