Patent ID: 8746694

Claim:
A printer comprising: at least one print head; at least one media transport operative to receive a substrate media and to convey the substrate media past said at least one print head; a trip wire sensor upstream of the at least one print head, said trip wire sensor including a tensioned wire operatively connected to at least one transducer, said trip wire sensor operative to detect if a part of the substrate media conveyed by said at least one media transport exceeds a predetermined height above the at least one media transport, said tensioned wire being positioned to be contacted by the substrate media if the substrate media exceeds the predetermined height, and generate a first signal that the substrate media exceeds the predetermined height; and a printer control system which upon receipt of the first signal takes corrective action to prevent substrate media from contact with the print head, wherein contact by the substrate media with said tensioned wire causes the at least one transducer to generate the first signal to the printer control system.