Variable pitch fuel supplier and an oven for use with the same

An oven for use with a variable pitch fuel supplier and for use with biomass fuel comprising:

• a body which is able to be placed on the ground, said body having a combustion cabinet and an auxiliary equipment cabinet, said combustion cabinet having a burner received therein, said auxiliary equipment cabinet having a fuel supplier and an electrical equipment received therein, said fuel supplier having a hopper, a fuel tube, and a rotary vane feeder rotatably received in said fuel tube, said electrical equipment having a power supply and a feeding motor driving said rotary vane feeder, said fuel tube being of cylindrical and having a feeding end in said auxiliary cabinet and a discharge end above said burner, said rotary vane feeder having a central shaft and a spiral vane spirally distributing around said central shaft, said central shaft having a tail end being coupled to said feeding motor and a free end at said discharge end of said fuel tube, pitches varying larger from said tail end to said free end.