A METHOD OF DUPLEX PRINTING

A method of duplex printing, comprising a first print cycle in which a web (10) is advanced step-wise relative to a print station (12) in order to print successive images (16) onto a first side of the web (10), the images (16) being separated by gaps (24), and a second print cycle in which the web i...

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Bibliographische Detailangaben
Hauptverfasser:	Bruekers, Stefan J. G, Holtman, Lodewijk T
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CORRECTION OF TYPOGRAPHICAL ERRORS i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES PERFORMING OPERATIONS PRINTING SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A method of duplex printing, comprising a first print cycle in which a web (10) is advanced step-wise relative to a print station (12) in order to print successive images (16) onto a first side of the web (10), the images (16) being separated by gaps (24), and a second print cycle in which the web is moved past the print station (12) in reverse orientation in order to print images (14) onto a second side of the web such that the images (14, 16) on the first and second sides are in registry with one another,characterized in that the following steps are performed in each print cycle:- measuring a length (L_i, L_j) of each printed image (14, 16) by detecting an advance of markings (20) that are formed on the side of the web (10) on which the images are being formed; and- on the basis of the measured lengths, controlling the lengths (G_i, G_j) of the gaps (22, 24) between the images such that distances (D_t) between leading edges of successive images are kept constant.