Paper curl correction apparatus

A paper curl correction apparatus provided along a paper conveying path in an electrostatic recording printing machine for correcting the curl in discrete paper sheets, said apparatus comprising:

• a plurality of paper conveying rollers arranged on a shaft for conveying a discrete paper sheet along a path in a paper advancing direction;
• a lower paper curl correction shaft;
• means for biasing said paper curl correction shaft against said paper conveying rollers in a direction having a substantial component in the paper advancing direction;
• a plurality of paper guide rollers arranged on a shaft and provided upstream of and spaced from said plurality of paper conveying rollers and said paper curl correction shaft with reference to the paper advancing direction, said plurality of paper guide rollers causing the paper sheet path to extend about an angular portion of the circumference of said paper curl correction shaft;
• and
• a position varying mechanism for varying a position at which said paper guide rollers are fixed so as to vary the angular range over which said paper sheet extends about the circumference of said paper curl correction shaft and to adjust a degree of correction of paper curl.