A cylinder with position feedback sensor

摘要

A cylinder with a position feedback sensor is provided. The cylinder comprises: a barrel 11; a piston rod 12; and piston 15. Markings M (see Figure 2) associated with a central portion of the piston rod 12C are readable by a sensor S. In practice, the freedom of slidable movement of the piston rod 12 is such that the markings M are retained entirely within the barrel 11 during use so that the external environment cannot influence (e.g. damage) the markings M.