Abstract: A roller assembly for transporting a substrate includes a step roller, a first transport roller, and a second transport roller. The step roller includes a main roller, an air cylinder, and a pair of edge rollers. The air cylinder is sleeved on the main roller, and includes a plurality of air jetting holes and a plurality of air suction holes. The edge rollers are disposed on the main roller and are located on opposite ends of the air cylinder. The first transport roller and the second transport roller are disposed on opposite sides of the step roller, wherein the substrate is transported from the first transport roller to the second transport roller through the step roller. A method using the same is also provided.

Abstract: A servo-driven cylinder screen printing machine includes a machine frame, a print cylinder, a direct-drive servo mechanism, a screen carrier and at least one linear servo mechanism. An infeed table and a delivery table are mounted in the machine frame at a front and a rear portion thereof, respectively, and the print cylinder is located between the infeed table and the delivery table. The direct-drive servo mechanism forms a direct-drive device connected to and driving a rotary shaft of the print cylinder to rotate at precisely controlled speed. The screen carrier is located above the machine frame and adjacent to a surface of the print cylinder. The linear servo mechanism forms another direct-drive device connected to and driving the screen carrier to linearly move reciprocatingly at precisely controller speed. Therefore, gears, tooth racks and cams are saved to avoid printing inaccuracy caused by noise and backlash in tooth drive.

Abstract: A servo-driven cylinder screen printing machine includes a machine frame, a print cylinder, a direct-drive servo mechanism, a screen carrier and at least one linear servo mechanism. An infeed table and a delivery table are mounted in the machine frame at a front and a rear portion thereof, respectively, and the print cylinder is located between the infeed table and the delivery table. The direct-drive servo mechanism forms a direct-drive device connected to and driving a rotary shaft of the print cylinder to rotate at precisely controlled speed. The screen carrier is located above the machine frame and adjacent to a surface of the print cylinder. The linear servo mechanism forms another direct-drive device connected to and driving the screen carrier to linearly move reciprocatingly at precisely controller speed. Therefore, gears, tooth racks and cams are saved to avoid printing inaccuracy caused by noise and backlash in tooth drive.