Improved printing apparatus and method

Details Improved printing apparatus and method Improved printing apparatus and method

B - Operations, Transporting

41

C

B41C 1/05 (2006.01) B41C 1/10 (2006.01) B41F 7/02 (2006.01) B41F 33/00 (2006.01)

Patent

CA 2099560

Printing apparatus has at least one print station including a blanket cylinder in rolling contact with an impression cylinder, a print cylinder for supporting a lithogra- phic plate, the plate cylinder being in rolling contact with the blanket cylinder, at least one discharge source for applying an image to a plate supported by the plate cylin- der, and a motor for moving the en- ergy source relative to the plate cyl- inder so that when the plate cylin- der is rotated, the discharge source scans a raster on the surface of the plate supported by the plate cylin- der. The apparatus may be confi- gured as an in-line or central-im- pression type press. A controller re- sponsive to picture signals repres- enting an original document repea- tedly actuates each discharge source momentarily during the scan thereof so that the discharge source forms on the plate surface an image comprised of dots corresponding to the original document. The controller includes a dot-position look-up table for storing the x and y coordinates of substantially all dot positions on the plate and is arranged to actuate each energy source to form image dots at selected ones of the dot positions when said picture signals are present. The apparatus also includes provision for regulating the ink applied to the plate at each print station.

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