| 摘要 |
PROBLEM TO BE SOLVED: To improve printing registration accuracy of a first side and a second side. SOLUTION: A first printing device to form an image on the first side of a web has a mark forming means to form registration marks in previously specified positions of each page of the web. A second printing device to form an image on the second side of the web has a mark detection means to detect the registration marks, and a detection period regulation means to enable the detection of the registration marks by the mark detection means only for a previously set period, and a control means to generate a web delivery control signal for every previously set period and match its phase with the phase of the occurrence timing of a mark detection signal emitted by the mark detection means by detecting the occurrence timing of the web delivery control signal and the registration marks. COPYRIGHT: (C)2006,JPO&NCIPI
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