A thickness sensor for layered sheet material entering a lamination machine includes an arm movable upon interaction with the layered sheet material. Each port includes arbitration and data interfaces. The conversion processing unit converts signals that are output from the pixels of the pixel array unit and that correspond to the color arrangement of the color filter unit into signals that correspond to a Bayer arrangement and outputs the converted signals. The pillow cover includes overlapping flaps to minimize the infiltration of dirt into the cover and onto the pillow.