| 摘要 |
PURPOSE:To prevent engine stalls or the decline in fuel economy by providing a control means to make longitudinal operations of rotary covers according to the number of revolutions of an engine. CONSTITUTION:Rotary covers 35, 36 covering a tilling section 34 are provided so as to longitudinally operable, and a ridging device 50 is set inside a notch at the nearly central part of the rotary cover 36. The rotary covers 35, 36 are put to longitudinal operations by a control means according to the signals from a sensor for detecting the number of revolutions of an engine 5, regulating the gap dimension of the notch. |
