Abstract: A method is provided for automatically printing a unique serial number on MICR documents wherein the serial number may be used to identify the source of the document. If problems occur during subsequent processing of the document, the serial number may be decoded to identify the source of the document for repair, etc., or to identify the source of printing fraudulent checks or if the document was printed on stolen equipment. The unique codes are preferably embedded within character fonts used to print the MICR documents. In this manner, no further modification to MICR printing systems is required. Rather, by modifying MICR fonts to each include a unique serial number, the serial number is automatically printed on all documents printed using the font.

Abstract: A method is provided for automatically printing a unique serial number on MICR documents wherein the serial number may be used to identify the source of the document. If problems occur during subsequent processing of the document, the serial number may be decoded to identify the source of the document for repair, etc., or to identify the source of printing fraudulent checks or if the document was printed on stolen equipment. The unique codes are preferably embedded within character fonts used to print the MICR documents. In this manner, no further modification to MICR printing systems is required. Rather, by modifying MICR fonts to each include a unique serial number, the serial number is automatically printed on all documents printed using the font.

Abstract: A printer ribbon cartridge device includes structure for maintaining tension of a printer ribbon which is supplied and contained on a supply spool having an automatic brake for preventing unwinding thereof whenever the cartridge is not installed on a printer. Ribbon guide structure is provided so that the printer ribbon will be confined to a desired path, positive capstan feed rollers are provided of intermeshing gear type for positive feed of the printer ribbon and further gearing is provided to positively drive a slipping clutch element for a take-up spool. A one-way locking pawl also engages with the gearing to prevent rewinding of the printer ribbon after use and thereby prevent the reuse of same. The slip clutch for the take-up spool employs a gear driven input hub member provided with a central recess thereacross for supporting a deformed ring in an oval shape for driving contact by portions of the other circumference thereof against the inner surface of an outer take-up spool hub member.