One in three KBA Rapida 105 Sheetfed Presses Offers “No-sidelay Infeed”
WILLISTON, Vt.—KBA North America announced that its sheet infeed process known as the no-sidelay Sensoric Infeed System (SIS) has seen increase in growth. The SIS has become a key selling point of the 18,000 sheet per hour Rapida 105 41˝ format press on the world market, since it reduces or bypasses troublesome stages in sheet feeding. By doing this, it streamlines the production process, ensuring quicker turn-around times and bigger profits.
Printing press manufacturers and the graphics industry had for years been trying to simplify the process of feeding and aligning the sheet in a sheetfed offset press, a process complicated by the high running speeds involved. One of the chief aims was to make the process stable and reliable without the need for manual intervention—even with frequent changes between different printing substrates. KBA’s designers achieved this feat in the no-sidelay infeed system.
In traditional mechanical or pneumatic sidelays, such as those still the norm even in modern sheetfed offset presses, the incoming sheet is first braked, then stabilized in the front lays, and then aligned at the sidelay tabs. This happens in a pulling process involving many subsidiary steps before the sheet goes through the swing infeed. In KBA’s SIS, a sensor continually scans the edge of the sheet. This eliminates the risk of the scanning result being negatively influenced by the paper fibers. The gripper bar is prealigned in the single-revolution transfer drum according to the information transmitted about the position of the sheet edge.
One of the key advantages of the innovative KBA solution is that the feed process in the front lays is not interrupted by a sidelay process. Because of this, there is more time for stabilization and alignment of the sheet. SIS reduces malfunctions and enables a more precise infeed register to be achieved both with thin material, which tends to buckle, and rigid sheets, which can jump out of the front lays at high speed. There is no need to adjust the previous sidelay manually when changing printing substrates. Mechanical damage to sensitive printing substrates is also eliminated.