| 摘要 |
PURPOSE:To exactly measure the length of pit by providing a body to be turned in the lengthwise direction of shaft in contact with the surface of a drill rod and a measure to detect the advancing length of the drill rod on the basis of the rotation number and rotating peripheral length of the body to be turned. CONSTITUTION:The surface of a rotary body 26 has an uneven face to prevent slip, and the rotation number of the rotary body 26 is detected by a rotary encoder 27 attached to the other end of the rotary shaft 2. When the case 20 of the measure X moves vertically, the rotary body 26 turns correspondingly to turn the encoder 27, and by pulse based on the rotation, the vertical moving length of the case 20, or the vertical moving length of spindle 4, is detected and displayed on a digital displayer 30. When a set length is reached, a warning is sent out from an alarm 31. |
