The unwinding feeding part is also provided with a driving roller machine. The drive roller is an easily adjustable variable speed paper feed roller, which controls the speed of the web paper entering the printing unit smoothly, and generates the unwinding tension of the material belt together with the material roll braking device, so as to adapt to the production of different substrates (paper jam, thin paper, plastic film, etc.), and ensure that the web paper maintains the correct longitudinal position.
