| 摘要 |
In a belt conveyor, when an input lever is rotated in a fixed direction, an input shaft is rotated and a fourth gear fixed on the input shaft is rotated integrally in the same direction. Then, second and third gears are rotated in fixed directions and a first gear and a drive shaft are rotated in fixed directions. Thereby, a spiral spring connected to the drive shaft is wound up stronger little by little so as to store an elastic energy. If a rotating angle in the given direction comes to about 150 degrees, an end of a toothless portion of the fourth gear arrives a meshing part with the third gear so as to disengage from the third gear. Thus, a rotary shaft and the drive shaft are respectively rotated in reverse directions to the give directions by the releasing energy of the spiral spring. Consequently, the drive roller is rotated in a counterclockwise direction so as to drive a conveyor belt in a given direction.
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