Cutting blade control system, particularly for cutting-off machines for cutting logs of web material

A cutting-off machine for logs of web material comprising:

• a) a cutting blade for cutting logs of web material,
• b) a first motorization for moving the cutting blade toward a log to be cut,
• c) a control device for the cutting blade comprising:
• i) a measuring device able to measure a deformation value on at least a portion of said cutting blade,
• ii) a first comparison device to compare the deformation value measured by said measuring device with a first threshold deformation value,
• iii) an actuator to send, according to an input signal coming from said first comparison device, a control signal to stop said first motorization for moving the cutting blade toward the log whereby the movement of the cutting blade toward the log is stopped, and
• iv) a second comparison device to compare the deformation value measured by said measuring device with a second threshold deformation value, said actuator being able to send, according to an input signal coming from said second comparison device, a control signal to start said first motorization whereby the movement of the cutting blade toward the log is started.