Device for producing a reliable breaking line for the industrial cutting to length of glass sheets by means of a cutting wheel which moves under load pressure on a float glass line, having the following features: a) a base console which has a rotation axis at the lower side and in which there is rotatably supported a rotation head which operates at one side, b) a servo motor at the upper side of the base console, c) a rocker bar retention member which is constructed in a bar-like manner and which is connected at one side to the operating side of the rotation head by means of connections and which carries at the other opposite side a cutting wheel retention member having a cutting wheel, d) a rocker bar, and e) an expansion measurement strip in order to detect the oscillations thereof, an electronic measurement system relating thereto and a data cable for controlling the servo motor, characterized in that f) the rotation knob of the base console is connected at the operating side by means of a resilient element and a horizontally fixedly supported but vertically movably supported connection element to a threaded spindle which can move vertically in a connection sleeve, g) the servo motor has a motor shaft which is securely connected to the connection sleeve, h) the rocker bar has the form of a zone which is weakened in a selective manner by means of 4 large cylindrical holes and a small cylindrical hole between them in the central region of the rocker bar retention member, wherein these holes constitute in the side view circles having a large radius and a circle having a small radius and these holes merge seamlessly into each other in the longitudinal axes thereof, and i) the expansion measurement strip is attached at the upper side of the rocker bar. a) a base console which has a rotation axis at the lower side and in which there is rotatably supported a rotation head which operates at one side, b) a servo motor at the upper side of the base console, c) a rocker bar retention member which is constructed in a bar-like manner and which is connected at one side to the operating side of the rotation head by means of connections and which carries at the other opposite side a cutting wheel retention member having a cutting wheel, d) a rocker bar, and e) an expansion measurement strip in order to detect the oscillations thereof, an electronic measurement system relating thereto and a data cable for controlling the servo motor, characterized in that f) the rotation knob of the base console is connected at the operating side by means of a resilient element and a horizontally fixedly supported but vertically movably supported connection element to a threaded spindle which can move vertically in a connection sleeve, g) the servo motor has a motor shaft which is securely connected to the connection sleeve, h) the rocker bar has the form of a zone which is weakened in a selective manner by means of 4 large cylindrical holes and a small cylindrical hole between them in the central region of the rocker bar retention member, wherein these holes constitute in the side view circles having a large radius and a circle having a small radius and these holes merge seamlessly into each other in the longitudinal axes thereof, and i) the expansion measurement strip is attached at the upper side of the rocker bar.