| 摘要 |
PURPOSE: A tooth form belt, a tooth form belt driving gear, and an office apparatus are provided to decrease speed fluctuation of a tooth belt of a tooth belt driving gear and to improve factor accuracy or image quality of an office apparatus. CONSTITUTION: A belt tooth unit(11) is composed of tooth root portions(12), power transmission portions(13), tooth ends portions(14), and a tooth end surface portion(15). The tooth root portion is composed of circular surfaces arranged symmetrically to the central line(C2) in the direction of the width of tooth. The power transmission portions are installed symmetrically to the central line with continued with the tooth root portion, and are composed of circular surfaces of a protruded shape. The tooth ends portions are installed symmetrically to the central line with continued with the power transmission portions, and are composed of circular surfaces. The tooth end surface portion is continued with the tooth ends portions, and are plane. The maximum pressure angle in the connection of the power transmission portions and tooth ends portions is 15 to 25 degrees. The side face of the belt tooth unit is contacted into the side face of tooth grooves of a pulley late, and the component of vertical direction of reaction force, produced when the belt tooth portion slides into the pulley tooth groove, is decreased.
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