| 摘要 |
PURPOSE:To miniaturize a tractor and reduce a driving load by guiding a pin belt by means of a small diameter roller by which a part of the curved part of said pin belt on the opposite side of a driving pulley is inscribed, and reducing a distance between a guide shaft and the outer periphery of said pin belt. CONSTITUTION:When a driving shaft 10 is rotated, the driving force is transmitted to a pin belt 3 via a driving pulley 2, the pin belt 3 is rotated along a roller 6 and a guide 8, and a sheet of fan fold paper is sent by means of a pin 5. Although the pin belt 3 slides on the surface of the guide 8, since it is partly guided by the roller 6, the driving load of the pin belt 3 can be reduced. Also, the small diameter of the roller 6 can reduce the distance A between a guide shaft 11 and the outer peripheral face of the pin belt 3, enabling a tractor to be miniaturized.
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