Method for cutting block materials and cutting machine for cutting block materials

A cutting machine for the cutting of block materials, particularly foamed or expanded materials, said cutting machine comprising

• a machine frame,
• a knife element having a first and a second end,
• a guide means for guiding the knife element in a longitudinal direction of the knife element, and
• first and second drive units, the first drive unit being coupled to the first end of the knife element, and the second drive unit being coupled to the second end of the knife element,
• the first or the second drive unit being arranged on a tensioning means provided for setting the tension of the knife element,
• wherein
• the first and second drive unit each comprise a servo motor and an eccentric disk with pushrod, said disk being coupled to the servo motor, and the first and second ends of the knife element having a respective one of said pushrods connected to it, and
• a common control unit is operative to control the servo motors of the first and second drive units, said control unit being operative to control the rotational frequency of the servo motors synchronously with respect to full revolutions, and, during a revolution of the servo motors, to decelerate and again accelerate at least one of the servo motors in such a manner that, in a first and a second partial range of the revolution, the servo motor of the first drive unit has a larger angular speed than the servo motor of the second drive unit and, in a third and a fourth partial range of the revolution, the servo motor of the second drive unit has a larger angular speed than the servo motor of the first drive unit.