B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
B41F 13/193 (2006.01) B41F 7/04 (2006.01) B41F 13/12 (2006.01) B41F 13/44 (2006.01) B41F 35/06 (2006.01)
Patent
CA 2258331
A fixed cutoff press is adapted to a variable cutoff press while maintaining thesize of the blanket cylinders. A plate cylinder is mounted on a frame and includes a plate cylinder sleeve and a blanket cylinder is mounted on the frame, includes with a gapless blanket cylinder sleeve. The gapless blanket sleeve contacts the plate cylinder sleeve at a first nip. The press has an impression plate mounted on the frame in the case of a non-perfecting press or an identical, mirror image assembly of plate and blanket cylinders in the case of a perfecting press. A material to be printed passes through a second nip. Inkers are provided for transferring an ink film to the plate cylinder sleeve, the ink pattern being subsequently transferred to the blanket cylinder sleeve at the first nip and the ink pattern being subsequently transferred from the blanket cylinder sleeve to the material to be printed at the second nip. The press also includes drivers to drive in rotation the plate cylinder and drivers to drive in rotation the blanket cylinder. A controller is provided for controlling each of the drivers so that the surface speed of the sleeve of the plate cylinder and the surface speed of the blanket cylinder sleeve are equal at the first nip. The plate cylinder sleeve is variable, whereby a length of an image to be printed is varied proportionally to the variable outer diameter while maintaining the outer diameter of the gapless blanket cylinder sleeve constant. Accordingly, since the size of the blanket is fixed and offset presses presently require changing plates for each job, changes in cutoff are made in a manner similar to today, i.e. plates but not blankets are changed for each job. Ideally, the residual ink on the blanket, once the image is transferred to the web, is small enough that a secondary image will not appear on the web. The invention also provides for the inclusion of a blanket washer or scrapper, which continually removes the residual ink and recirculates it through the ink train to avoid any secondary images.
Imprimeries Transcontinental Inc./transcontinental Printing Inc.
Robic
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