PURPOSE: To feed securely blanks by permitting fed-out blanks to abut against a nip section between an auxiliary roller and a paper supply roller, stop and stand by once and then are fed out to a picture forming device according to the signal thereof.

CONSTITUTION: Blanks are fed into a nip section between an auxiliary roller 21 of a blank guide section 13 and a paper supply roller 11 provided in a copying machine body 4 by a paper supply mechanism of a paper supply device body 12 in a paper supply device 5 attached to a paper supply cassette attaching opening of the copying machine body 4, and once stopped to stand by. Thereafter, a print button on the copying machine body 4 is depressed to generate the copy starting command and start the rotation of the body 4 side paper supply roller 11 so that blanks then standing by are transferred into the copying machine body 4.