Printing apparatus

B - Operations – Transporting – 41 – F

Patent

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101/80

B41F 5/00 (2006.01) B41F 5/06 (2006.01) B41F 17/02 (2006.01)

Patent

CA 1234315

-24- PRINTING APPARATUS Abstract A printing machine (10) is adapted for printing a plurality of imprints (12) onto a sheet (14) divided into a plurality of sequentially longitudinally spaced printing fields (16) having a selected field length and being divided into a plurality of longitudinally and laterally spaced printing domains (18). The machine (10) includes a plurality of spaced printing rolls (20a - 20f) having parallel axes (22a - 22f) and peripheral cylindrical surfaces (24a - 24f) having image transfer regions (26a1 - 26fnf) adapted to print the imprints (12) onto the sheet (14). The rolls (20a - 20f) each have circumferences (28a - 28f) which are different integral multiples of the field length and which are not integral multiples of one another. Each of the cylindrical surfaces (28a - 28f) has a subset of the image transfer regions (26a1 - 26fnf) positioned to print the imprints (12) on only a selected subset of the printing domains (18), the selected subsets of the printing domains (18) having a null set intersection. The rolls (20a - 20f) are rotated about their axis so that the cylindrical surfaces (24a - 24f) have equal tangential velocities. An image reproducing medium is transferred onto each of the image transfer regions 26a1 - 26fnf). The sheet (14) is moved longitudinally generally tangentially sequentially adjacent each of the cylindrical surfaces (24a - -25- 24f) at a velocity to match that of the cylindrical surfaces (24a - 24f). The image reproducing medium is transferred from the image transfer regions (26a1 - 26fnf) to the printing domains (18).

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