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1. WO1989005729 - PROCEDE ET APPARAREIL POUR IMPRESSION SUR DU MATERIAU EN FEUILLES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

C LA I MS

1. A method of printing paper or textile material by directing light on to a light sensitive printing surface through electronically operated
light shutter units and applying printing medium
to the light sensitive printing surface whereby the printing medium adheres to the portions of the printing surface on which the light has fallen and then bringing the printing surface into contact with the material to be printed is characterized by arranged the shutters (5 or 6 or 7 or 8) in an array forming a two-dimensional area disposed in proximity to the light sensitive
surface (9 or 10 or 11 or 12) and setting the shutters in a pre-arranged pattern for passage o r non-passage of light through the shutters of the array then applying light to whatever portion of the array is at any
particular. time adjacent to the light sensitive printing surface.

2. A method of printing paper or textile
material according to claim 1, characterized in that the light sensitive printing surface is a rotatable
printing drum (9 or 10 or 11 or 12) and the two dimensional area constituting the array of shutters is constituted by at least a portion of the surface of a second
and hollow control drum (1 or 2 or 3 or 4) the axis
of which is parallel to the axis of the printing
drum (9 or 10 or 11 or 12) constituting the light
sensitive printing surface, the light being applied
to that portion of the inner surface of said control drum (1 or 2 or 3 or 4) which is for the time being
adjacent to the printing drum (9 or 10 or 11 or 12), said printing drum and said control drum being arranged to rotate in opposite directions at the same p e r i p h e r a l speed.

3. A machine for printing sheet material incorporating a rotatable light sensitive printing drum (9 or 10 or 11 or 12) arranged to be sensitized to retain printing medium applied thereto at any point on the surface where a beam of light falls on that point on the surface, electronically operated shutter units (5 or 6 or 7 or 8) operable to permit or block the passage of light therethrough to the printing drum, a light source arranged to apply light to the shutters and means for applying printing medium to the printing drum at a position where it can be retained at sensitized points is characterized in that the shutter units (5 or 6 or 7 or 8) are arranged to form at least a portion of the wall of a second and hollow control drum (1 or 2 or 3 or 4) disposed parallel to the pri nti ng drum (9 or 10 or 11 or 12) and arranged to rotate in a direction opposite to that of the printing drum and at the same peripheral speed, the light projecting means being located within said control drum (1 or 2 or 3 or 4) and being arranged to project light against the light shutter units
(5 or 6 or 7 or 8) forming that portion of the wall of the control drum (1 or 2 or 3 or 4) which is at that instant closest to the printing drum (9 or 10 or 11 or 12).