Patent ID: 7702414
Filing Date: 2010-04-20
Classification: B41F,B65H

Abstract:
1. A cutting-off control apparatus for a printing machine comprising: a sawing cylinder for cutting off a web which has images printed thereon; a mark detector provided upstream of said sawing cylinder for detecting marks on said web; a reference signal generator for outputting an output signal according to cutting-off timing at which said web is cut off by said sawing cylinder; a compensator roller for increasing or reducing a travel path length of said web, based on a difference between the cutting-off timing at which said web is cut off by said sawing cylinder and timing at which each of the marks is detected by said mark detector, to adjust a cutting-off position at which said web is cut off by said sawing cylinder; a positional relationship acquisition means for previously obtaining a desired positional relationship between a position in a web traveling direction of each of marks to be printed on said web and a target cutting-off position of said web; and a detection timing control means for controlling mark detection timing so that the detection of each of the marks by said mark detector is performed during a specified period based on said desired positional relationship and a phase difference between the cutting-off timing at which said web is cut off and the output signal from said reference signal generator.