A cutting line intended to trim and cut vegetation which can be used in rotary-head implements such as brush cutters and edge trimmers. The machine comprises a running gear, tillage tools, and a packer unit, the latter being coupled to the running gear and forming a constructional andor functional unit therewith. The windshield curtain has a stored condition in which the windshield curtain is positioned in a recess that extends into a forward facing surface of the front header. The sensing element detects the pressure.