Rotary cutter for trimming printed products conveyed in an overlapping flow

摘要

A rotary cutter for trimming printed products conveyed in an overlapping flow. The rotary cutter including a first knife that rotates and a second knife that rotates counter to the first knife. The second knife is arranged to operate jointly with the first knife. At least one of the knives includes a plurality of blades distributed over a circumference. A conveying device conveys the overlapping flow between the first knife and the second knife. A control unit controls the rotational speed of at least one of the first knife and the second knife. The rotational speed of at least one of the knives is predetermined based on at least one of the speed value for the conveying device or a thickness value of the overlapping flow.