1.up roller use the soft rubber shaft ,so when feed the board ensure the not broken the board , wearing rubber shaft , make the balance correct ,keep the paper feed steady and accurate. 2.The lower feed roller with embossing roller diameter ¢ 175 mm, seamless steel pipe, embossed hard chrome plating. 3.feeding roller cross slider-type dial dial manually adjust the adjustment range of 0 ~ 12 mm. Adjustment does not affect the gear gap, to ensure transmission accuracy.