| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to obtain easily multistage speeds by controlling the speed only by a value set by either a push-button switch for setting speed increase or a pushbutton switch for setting speed reduction. SOLUTION: When an operating lever 3 stands upright relative to the operating surface, this is in the zero-speed mode; if it is shifted upward, a middle holding stage mode is obtained; if it is shifted to the upper end, then a increase- reduce speed mode occurs. On the contrary, if the operating lever 3 is shifted downward, an electric braking mode occurs by means of a program controller. The speed increases in proportion to the number of times of pressing the push- button switch 5 for setting speed increase, and the speed reduces in proportion to the number of times of pressing he push-button switch for setting speed reduction. Depending on the number of times of pressing the push-button switch 5 for setting speed increase or of pressing the push-button switch 5 for setting speed decrease, a predetermined set speed is indicated on a speed indicator 7. As a result, multistage speeds can be set, the operation can be made easier, and the run efficiency can be improved. |
