Hot-air circulation unit and a shaking blade of a baking apparatus

A baking apparatus including a surrounding wall that defines a heating chamber therein,

• a kneading case mounted centrally in the heating chamber,
• a hot-air circulation unit for supplying hot air into the heating chamber,
• a shaking blade mounted rotatably within the kneading case and rotatable about a vertical axis,
• a motor for driving rotatably the shaking blade, and
• a microcomputer including means for controlling operation time of the motor and the hot-air circulation unit to vary duration of kneading, fermentation, baking and cooling steps, the microcomputer being effective to complete baking process with uniform product quality within a constant length of time, wherein the improvements comprises:
• the surrounding wall further having an upper opening and a lower opening which are formed therethrough, and a guide fin unit installed on said surrounding wall near the lower opening so as to guide air to enter into said chamber via said lower opening to flow upward along a passage defined between said surrounding wall and said kneading case;
• and
• said shaking blade having a vertical rotating shaft adapted to be fastened to a motor shaft of said motor, a horizontal plate secured to and extending radially from said rotating shaft, and a trapezoidal sheet fixed on and inclined relative to said plate, said trapezoidal sheet having an inclined side adjacent to but spaced apart from said rotating shaft in such a manner that, during a kneading operation, said sheet permits sliding movement of dough between said rotating shaft and said inclined side.