| 摘要 |
PURPOSE:To perform detection of an estimated error of a rotary press machine precisely by surely extracting a detecting signal of a register mark, by generating a gate pulse which is in a pulse width containing a detecting signal of the register mark according to a result which has detected the lapse of time corresponding to an interval up to a shorter one than a regular interval between a reference mark and the register mark from the forward edge of the reference mark on the basis of detecting signal of the reference mark. CONSTITUTION:As each of marks is so constituted as to be detected as an electric signal by a photoelectric detector 5 fixed on a scanning line 4 by opposing to each of the marks and detection is performed on the scanning line 4, a pulselike signal is obtained according to transfer of long-sized paper 1. Therefore, when a clock pulse C having sufficiently higher high frequency than teach of pulse widths and pulse intervals corresponding to each of lengths and intervals d0, l, D is counted from the forward edge 2a of a reference mark 2 on the basis of a detecting signal B and counted up to a count value n1 whose interval l is shorter than an interval L in addition to a count value n corresponding to the do, time is reached to a point of time t1 and when the gate pulse D is generated up to a count value n2 from that point, a pulse width of the same comes to contain the detecting signal of a register marks 3a. |
