PURPOSE: To correct a bank not without damaging the not, by providing a motor, controlled according to an oblique running amount detected by a photo sensor, and a soroban (Japanese abacus) roller and a bearing, which are for correcting oblique running.

CONSTITUTION: A bank not, conveyed from other mechanism part, is guided to an upper guide 10 and a lower guide 11 and is conveyed by feed rollers 12 and idler rollers 1, and an oblique running amount is detected by a luminous element 13 and a collecting element 9 of each of photo sensors mounted on both sides. According to the detected oblique running amount, the number of revolutions of each of external motors 1M and 2M is controlled to correct oblique running by means of soroban (Japanese abacus) rollers 4 and bearings 3 on both sides. This constitution enables correction of oblique running without damaging a bank not having bending or wrinkles.