Devices and methods for sensing wear of a component are described. The ink removal unit is located between the printing unit and the ink fixing unit, and includes an ink removing element that contacts the nap on the surface so as to remove the ink stuck to the nap. The touch sensor also includes a touch panel, a plurality of proximity electrodes, and a plurality of shield electrodes. The butterfly plate is in the valve body and secured to the butterfly shaft so that rotation of the butterfly shaft causes the butterfly plate to rotate about a second axis through a travel path between a closed position and an open position.