Electrophotographic printing device

Details Electrophotographic printing device Electrophotographic printing device

G - Physics

03

G

G03G 15/16 (2006.01)

Patent

CA 2458535

The invention relates to an electrophotographic printing device comprising a toner- developer unit, a lighting device, a developer drum, a photoconductor, a transfer unit and an earthed charging device, wherein the substrate to be printed is placed on a transport device and moved along the transfer area of said transfer unit and the toner image of the transfer unit is transmitted to the substrate. A clear, sharp and shadow-free printed image is obtained by arranging the substrate (30) on a non-earthed, electrically conductive layer (31) which is insulated relative to the earthed transport device (25) by means of an insulator (17, 17.1 ... 17.n, 17.3) extending along the charging device (16, 17) that is located above the substrate (30) and the measurement of substrate (30) that is to be printed and that is oriented in the direction of transport, wherein said charging device can be charged at a potential (exciting voltage Uf) of between 1 to 10kV, more particularly 1.5 to 4kV.

La présente invention concerne un dispositif d'impression électrophotographique comprenant une unité de développement de toner, un dispositif d'éclairage, un tambour de développement, un photoconducteur, une unité de transfert et un système de charge mis à la terre. Le substrat à imprimer reposant sur un dispositif de transport est avancé à la zone de transfert de l'unité de transfert et l'image révélée est transférée de l'unité de transfert sur le substrat. L'objectif de la présente invention est d'obtenir une image imprimée nette, précise et sans ombre sur le substrat. A cette fin, lors du processus d'impression, le substrat (30) est placé sur une couche électroconductrice (31) qui n'est pas mise à la terre, qui est isolée du dispositif de transport mis à la terre (25) par l'intermédiaire d'un isolant (17, 17.1 ... 17.n, 17.3), qui s'étend sur le dispositif de charge (16, 17) se trouvant sur le substrat (30) et sur l'étendue du substrat à imprimer (30) qui est orientée dans la direction de transport et qui peut être chargée à un potentiel (tension d'excitation U¿F?) allant de 1 à 10 kV, notamment de 1,5 à 4 kV.

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