Rotary cutter for trimming printed products conveyed in an overlapping flow
AssigneeMueller Martini Holding AG
InventorStefan Liebheit
Life of this patent
Estimating the term…
Abstract
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.
Claims17
A rotary cutter for trimming printed products, conveyed in an overlapping flow, the rotary cutter comprising:
- a first knife that rotates;
- a second knife that rotates counter to the first knife, wherein the second knife is arranged to operate jointly with the first knife and planes of faces of the first and second knives are arranged substantially perpendicular to the conveying direction;
- wherein at least one of the first knife or the second knife includes a plurality of blades distributed over a circumference of at least one of the first knife or the second knife;
- a conveying device to convey the overlapping flow between the first knife and the second knife;
- a thickness measuring device arranged to detect a thickness of the overlapping flow;
- a speed measuring device arranged to detect a speed of the overlapping flow;
- and
- a control unit coupled to receive outputs of the thickness measuring device and speed measuring device to automatically control and adjust a rotational speed of at least one of the first knife and the second knife based on the speed of the overlapping flow and the thickness of the overlapping flow.
A rotary cutter for trimming printed products, conveyed in an overlapping flow, the rotary cutter comprising:
- a first knife that rotates at a rotational speed and includes a plurality of blades distributed over a circumference of the first knife to trim the printed products;
- a second knife comprising a ring that rotates counter to the first knife and operates jointly with the first knife, wherein the ring and the plurality of blades define a cutting gap;
- a conveying device to convey the overlapping flow between the first knife and the second knife in a conveying direction;
- a thickness sensor to detect and output a thickness of the overlapping flow;
- a speed sensor to detect and output a speed of the overlapping flow;
- and
- a control unit coupled to receive the outputs of the thickness sensor and speed sensor, wherein the control unit uses the outputs to determine an optimum rotational speed and automatically adjusts the rotational speed of the first knife to the optimum rotational speed to cause at least 50% of a cutting edge in the longitudinal direction of each blade to trim the printed products.
Dependencies are inferred from the claim text.