METHOD AND SYSTEM FOR VERIFYING THE MODIFICATION OF A TRANSMISSION ELEMENT SUCH AS A CHAIN OR A BELT

A method for verifying the modification of a transmission element such as a chain or belt, wherein at least one non- contact sensor (11) is provided, positioned in a direction substantially parallel to the movement direction of a transmission element (13) provided with at least one detectable element (12) that can be observed by the above at least one sensor (11), wherein said at least one sensor (11) and a motor (M) of said transmission element (13) are connected to a data analysis system (16) which acquires the signal detected by the sensor (11) and processes it according to a preselected parameter referring to the transmission element (13) during its functioning comprising the following steps: - acquiring the signal (51); - processing the signal detected on the basis of a preselected parameter referring to the transmission element (13); - signaling anomalies deriving from signals detected (in 51) with respect to preselected parameters referring to the transmission element (13); - interrupting the machine service if the anomalies detected in the previous item can represent a danger for the machine.