PURPOSE: To facilitate the replacement of each roller as well as to improve the accuracy of finishing, by attaching a block frame installing a delivery roller and an auxiliary feed roller to a sub-frame free of detachment.

CONSTITUTION: A sub-frame 12 is locked to an interval between a pair of wall parts 1a and 1b of this body 1 with an attaching screw 13. And furthermore, on this sub-frame 12, these is provided with a block frame 14 free of detachment by an attaching screw 15, and in an interval between wall parts 14a and14b of this block frame 14, there are provided with a delivery roller shaft 3a having a delivery roller 3 and an auxiliary feed roller shaft 5a having an auxiliary roller 5 at the specified intervals. Gears 16 and 17 are installed in each one end of these roller shafts 3a and 5a, and they are engaged with a driving gear 21 of an idle shaft 20. Therefore, a rotation transmitting device 21a is constituted of these egars 16 and 17 and the driving gear 21, and it is driven by a drive motor 9.