The Standard Horizon HT-80 Three-knife Trimmer is designed for operation in-line with the Standard Horizon BQ-470, SB-07, and SB-09S perfect binders, or for use off-line. The HT-80 includes advanced set-up automation through a user-friendly 10.4” color touch-screen control panel to meet the requirements of the short run print-on-demand book market. After inputting the untrimmed and finished trim book sizes, automated adjustments include the infeed, jogging, and knife sections. The HT-80 allows for trimming of variable thickness books, one after another, for true on demand book production. It can trim finished books from sizes ranging 5.5” x 3.9” up to 13.4” x 11.8”, with programmable memory for up to 200 different jobs, for instant recall of frequently-run jobs. Precision stepper motors accurately position all guides and clamps to insure professional quality cutting at speeds up to 1,000 cycles per hour. A uniquely designed servo-motor controlled jogging mechanism helps provide accurate book registration. The swing knife movement ensures sharp and accurate trims to produce a clean finished book, and a silicon spray unit is available to keep the knife clean during operation.