| 摘要 |
A paper feed tractor comprising a main frame, a sub frame secured to the main frame with a major portion thereof and disposed in parallel to the main frame, and a belt driving unit supported for sliding movement between the main and sub frames. The main and sub frames have first openings formed in a coaxial relationship at locations adjacent one end portions thereof so as to loosely fit a drive shaft therein and second openings formed in a coaxial relationship at locations adjacent the other end portions thereof so as to support a support shaft for sliding movement and for fixation therein. The belt driving unit includes a belt driving sprocket wheel supported for rotation on a plate-formed belt receiving member, and an endless belt extends between the sprocket wheel and a belt guide formed on the belt receiving member. The belt receiving member of the belt driving unit has third and fourth openings formed at locations thereof opposing to the first and second openings for receiving the drive and support shafts loosely therein, respectively. A shaft hole which is formed in the belt driving sprocket wheel for engaging with the drive shaft is exposed to the third opening.
|
