Matrix print head printer

Details Matrix print head printer Matrix print head printer

B - Operations, Transporting

41

J

101/96.09

B41J 35/26 (2006.01) B41J 3/54 (2006.01)

Patent

CA 1214071

ABSTRACT OF THE INVENTION A matrix printing apparatus of the type having a path for sequentially transporting a series of documents to be printed between a plurality of dot matrix ballistic print heads and back-up platen rollers opposite each print head, the dot matrix ballistic print heads adapted, when actuated, to simultaneously impact an ink source and one side of each document as each document passes the print heads to apply printed material to each document in a pre-programmed array. The dot matrix ballistic printing heads also impact upon the back-up platen rollers when applying printed material to the documents. The improvement of the present invention comprises selectively moving the back-up platen rollers from a first position immediately adjacent the corresponding print head when the print head is actuated, to a second position at a distance from the corresponding print head when the print head is not actuated, such that the back-up platen rollers are removed from the document transport path when the print heads are not applying printed material to each document to provide a relatively unobstructed path for transporting the documents when the print heads are not actuated. The matrix printing apparatus also includes an ink source which comprises an endless inked ribbon which continually moves between the dot matrix ballistic print heads and the document path, and includes an ink guard disposed between the inked ribbon and the document path, the ink guard having relatively small apertures therein adjacent each print head wherein only the portion of the ribbon adjacent each print head extends through each corresponding aperture and contacts each document during application of printed material to each document, thereby preventing smearing of the documents by portions of the inked ribbons which are not adjacent each print head.

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