Identification and orientation of the part
Once the shuttle system carries the part inside the marking cabinet a camera installed above it focuses the part while the software verifies the congruity between the programmed code and the one already present. This operation takes few milliseconds. Once objectified the code, the coordinates of the center of the part and its angle are used for correcting the axis positioning parameters and thus the marking process.
If the part has been placed in a wrong way – for example being it not aligned through the pins above a limit angle which could compromise the marking process or if it is just placed overturned or rotated 180 degrees – the system will generate an acoustic signal while the part will be brought out in order to be correctly placed by the operator. If the machine is connected to a SMTP server it can automatically send an email to assigned addresses for signaling the anomaly.
“We have verified using laboratory tests – says again Ievoli – that the focus tolerance is ±3mm. Nevertheless the measure of distance focus and its consequently correction through the 6 axes contributes to ensuring always clear results even in case of misalignment. The orientation on the working plan takes place through measuring at least three focal distances in three different points. Inside the cabinet we installed also a video surveillance system which records all the operations in order to quickly understand the causes of an eventual malfunctioning (wrong reading of the vision system, charging the part in a wrong way, robot error, collisions etc.). The system comes with a digital recorder which is connected to the operating PC. Finally, interfacing with EMS allows the machine to communicate with the customer production traceability system.”