| 摘要 |
PURPOSE:To prevent a variable speed gear from malfunctioning owing to a shift in position by detecting the variable speed gear and its operating device shifting in relative position or changing in direction, and then correcting the operation reference point of the operating device. CONSTITUTION:An attitude detector 12 is provided between a variable speed gear operating device 5 and a variable speed gear 2. The attitude detector 12 has a projection lamp at the center part, and also has a photodetector groups for detecting the position of reflected light from a reflector 13 outside of the projection lamp. The attitude detector 12 is installed under an operation link 7 closely to the fitting position of the operation link 7 to a variable speed operation lever 3, and is opposed to the reflector 13 is such a way that the detection surface of the photodetector group crosses the line which connects the center of the projection lamp and that of the reflector 13. If the photodetection point of reflected light moves owing to a shift in the position of the variable speed gear 2, the position of the variable speed gear 2 is detected by output signals of the photodetector group to put the variable speed operation lever 3 in operation, holding the relative positions. |
