From the Harthie site:
Harthie reinvented the scroll saw. During the working operation, the blade shaft of the Harthie scroll saw is endlessly rotatable through 360 degrees with only three fingers and movable in a diameter of 35 mm from the center. With this innovation, our scroll saw makes possible cuts in every direction without the need to move the workpiece. This leads to a never known before precision and sensitivity in sawing. There is no longer a limitation given by the longitudinal passage and during the construction of the scroll saw, special attention was applied to a very high sawing stroke of up to 40 mm. This results in a prevention of heat accumulation, a better utilization of the saw blade teeth and a higher cutting speed with less rpm (revolutions per minute).
http://www.harthie.de/en/