Method of correcting posture of paper sheets and device therefor

Abstract

Abstract PURPOSE:To correct the posture of a paper sheets with a high degree of accuracy and a high degree of reliability by detecting the longitudinal and cross lines of an imprint and by repeating the correction of an inclination and the correction of a shift in that order by plural times. CONSTITUTION:When a photosensor 5 detects the leading end of a paper sheet 13, a microprocessor reads an inclination of the sheet from inclination sensors 6A, 6B and computes an inclination angle and an acceleration for a DC motor which is necessary for correcting the inclination. Further, the microcomputer drives driven rollers 10A, 10B through drive circuits 51, 52, respectively, so as to correct the inclination. Then shift sensors 8A, 8B detect a shift of the paper sheet, and the computer computes the degree of the shift of the longitudinal line of the sheet 13 and a number of steps for a pulse motor which is necessary for correction of the shift. The shift correction is carried out by a drive circuit 53 while the sheet is held between the driven rollers 10A, 10B and drive rollers 28A, 28B. The above-mentioned steps are repeated plural times. Thus, it is possible to correct the posture of a paper sheet with a high degree of accuracy and a high degree of reliability.

Inventors

• 👤 Shigeru Sasaki
• 👤 Masataka Kawachi

Bibliographic Details