Sheet processing system and method
AssigneeENGICO S.r.L.
InventorRinaldo Benzoni
Life of this patent
Estimating the term…
Abstract
A flexographic printing unit is provided for a sheet along a printing line, including a plurality of printing assemblies, each including a printing roller apt to include a printing block, automatic and programmable movement apparatus for the printing rollers, apt to distance at least one of the printing rollers from the printing line during the printing procedure, so that the printing roller does not print the sheet, wherein each of the printing assemblies includes a structure fixed to the floor, at least one frame, which is movable with respect to the structure fixed to the floor, including at least one printing roller and apt to be moved by the displacement apparatus and damping apparatus arranged between the frame and a fixed point so as to damp the movement of the frame.
Claims10
A flexographic printing unit, for a sheet along a printing line, defining a vertical direction, perpendicular to said printing line and comprising
- a plurality of printing assemblies, each comprising a printing roller apt to include a printing block,
- automatic, programmable displacement means for said printing rollers, apt to distance at least one of said printing rollers from said printing line during a printing process, so that said printing roller does not print said sheet,
- each of said printing assemblies comprising:
- a structure fixed to a floor,
- at least one frame, which is movable with respect to said structure fixed to the floor, comprising said at least one printing roller and apt to be moved by said displacement means,
- said displacement means comprising eccentrics for said printing rollers, apt to modify the position of said printing rollers and apt to move said frame at least downwards and at least upwards with respect to said vertical direction,
- each of said printing assemblies comprising at least one guide, said frame being movably constrained to said at least one guide and said at least one guide being apt to exclusively allow a movement along said vertical direction of said frame with respect to said structure fixed to the floor,
- each of said printing assemblies further comprising
- damping means arranged between said frame and a fixed point so as to damp and push the movement of said frame, making a passive actuator when said damping means push the movement of said frame.
A method for printing a sheet along a printing line by means of a flexographic printing unit, comprising
- moving said sheet along a direction of said printing line through said flexographic printing unit,
- wherein said flexographic printing unit defines a vertical direction, perpendicular to said printing line and comprises a plurality of printing assemblies, each comprising:
- a printing roller apt to include a printing block,
- wherein said sheet has a length, in the direction of said printing line, which is greater than the length of the circumference of said printing rollers,
- a structure fixed to a floor,
- at least one frame, which is movable with respect to said structure fixed to the floor and comprising said at least one printing roller,
- displacement means movably constrained to said at least one frame and distancing, by means of said frame, at least one of said printing rollers from said printing line, so that said printing roller does not print said sheet,
- at least one of said printing rollers printing part of said sheet and being distanced from said printing line, so as not to print the whole of said sheet and so as not to repeat the print of a motif of said printing block thereof on said sheet,
- said displacement means, comprising eccentrics for said printing rollers, modifying the position of said printing rollers and moving said frame at least downwards and at least upwards with respect to said vertical direction,
- each of said printing assemblies comprising at least one guide, said frame being movably constrained to said at least one guide and said at least one guide exclusively allowing a movement along said vertical direction of said frame with respect to said structure fixed to the floor,
- and
- damping and pushing the movement of said frame with damping means of said flexographic printing unit arranged between said frame and a fixed point, and
- carrying out each of distancing and approaching movements of said printing rollers with respect to said sheet by said displacement means of said flexographic printing unit and said damping means through said frame and damped by said damping means, making a passive actuator when said damping means push the movement of said frame.
Dependencies are inferred from the claim text.