Saddle Stitchers — A Staple of Fine Finishing

"For example, exactly what does the quality control system consist of?" Stevens poses. "The Vijuk 321-T stitcher has a superior quality control system because it has photocell missing sheet detection, caliper-type double sheet detection in its feeding system, an oblique sheet monitor and a spine caliper to ensure complete booklets before it enters the stitching mechanism. Other manufacturers may offer only a caliper or an oblique sheet monitor.