SENSING APPARATUS FOR DETECTING AND DETERMINING THE WIDTH OF MEDIA ALONG A FEED PATH

摘要

A system to determine the presence and width of a media within a printing system is disclosed which includes a pair of adjustable media guides is provided about a carriage and is axially spaced apart along the length of the carriage. The guides may be manipulated along a horizontal axis in a sliding, synchronized manner and such that the center line of media is maintained along the centerline of the print station. A sensor is provided and affixed to the carriage, the sensor being operable for emitting an optical signal through an aperture located in the carriage. At least one of the guides includes an obstruction which may protrude into the path of the optical signal at defined locations. As the guides move about the horizontal axis, the obstruction may block or otherwise interrupt the optical signal, thereby signaling the sensor and the printer of the media's presence and width.