| 摘要 |
PURPOSE:To constitute a device with few number of parts and at low cost as well. CONSTITUTION:A device equipped with a ringlike endless gear 3 consisting of an upper rack part 3a and a bottom rack part 3b provided in parallel in opposing tooth faces to each other and a left half circle gear part 3c and a right half circle gear part 3d connecting fellow end parts of these both rack parts 3a, 3b to have inner teeth lined up in a semicirclelike, and which is connected to an original table 2 and provided in linearly movable manner, an input gear 5 for inputting driving force provided fixedly at the middle position between both rack parts 3a, 3b of this endless gear 3, a connecting plate 11 rotatably connected to an input shaft 7 of this input gear 5 to support a planetary gear 6, and the planetary gear 6 provided between the input gear 5 and the endless gear 3 so as to engage with these both gears 5, 3 and supported with the connecting plate 11. |
