Laserline stems from the need of some customers to bend without using press brake back gauges; the typical case of the multi-step bending (bump bending). It is also useful on oblique bends with no X5-X6 axes, or when the part has no usable resting surfaces.
Laserline projects a light beam that allows you to check the correct part position. It can be fitted to existing press brakes, depending on the CNC version installed.