Operator puts a stack of unmarked products into input nest and presses START button. Input lift goes upward till the separating module. Eccentric roller starts turning and feeds the products one-by-one to the transporting conveyor. Product activates Product Detect sensor and printing head prints required info. The product is moved in to the Output nest at the end of the conveyor. In the same time output lift goes downward so as to compensate increased height of stack of the printed products. Machine operates till the whole stack will be separated, than all products are collected in the output nest, and Machine becomes to STOP mode.