A sheet information output apparatus comprising an application member for applying external force to a sheet, a receiving member in opposition to the application member for receiving the external force, and an output unit for outputting a signal corresponding to the application of the external force. In one embodiment, a refresh controller receives an indication that the data processing system is being reset. The clip is compressible to ensure a tight fit of the second contact section to the grounding structure. In a preferred embodiment, the switches are n-channel MOSFETs. When the trolley moves to and fro along set tracks the anchor line is guided to wind on the winch spool in a spiral manner.