B - Operations – Transporting – 41 – M
Patent
B - Operations, Transporting
41
M
B41M 1/00 (2006.01) B41M 1/04 (2006.01)
Patent
CA 2382456
A method and apparatus (30) for producing vignettes (40) includes the use of a rotary printing member (32) having an outer surface with a series of elongated printing dots (42a). The lengthwise dimension of the dots (42a) extends substantially in the machine direction of the printing press, i.e., in a direction perpendicular to the axis of rotation of the printing member (32). For producing vignettes (40), the dots (42a) increase in density in a direction parallel to the linear direction and have a width which is substantially less than the length. For process printing operations, each color of the process printing is laid down by a series of dots (58, 60, 62, 64) extending substantially in the machine direction, although the screen angles of each series of dots may vary.
L'invention concerne un appareil (30) et un procédé destinés à produire des vignettes (40); le procédé consiste à utiliser un élément d'impression rotatif (32) comportant une surface externe ayant plusieurs points d'impression (42a). La longueur des points (42a) coïncide sensiblement avec la direction d'impression de la presse et est de ce fait perpendiculaire à l'axe de rotation de l'élément d'impression (32). Pour produire des vignettes (40), les points (42a) ont une densité plus grande dans une direction parallèle à leur direction linéaire et ont une largeur sensiblement inférieure à la longueur. Dans des opérations de quadrichromie, chaque couleur est appliquée par une série de points (58, 60, 62, 64) qui s'étendent sensiblement dans la direction de la machine, les angles de trame de chaque série de points pouvant cependant varier.
Herrmann Mark L.
Macrae & Co.
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