Abstract:
There is described an inspection system (10) for inspecting the quality of printed sheets being transported by a sheet conveyor system comprising at least one sheet gripper system (3a, 3b) including a plurality of spaced-apart gripper bars (32) for holding the printed sheets by a leading edge thereof. The inspection system (10) is placed along the path of the at least one sheet gripper system (3a, 3b) transporting the printed sheets and comprises an optical quality control apparatus for carrying out inspection of a first side of the printed sheets while the printed sheets are being transported by the sheet gripper system (3b). The optical quality control apparatus includes a line camera (11) for scanning the first side of the printed sheets. The inspection system (10) further comprises a suction roller (50) that is placed in front of the optical path (B) of the line camera (11) along the path (A) of the printed sheets being transported by the sheet gripper system (3b), which suction roller (50) contacts a second side of the printed sheets opposite to the first side which is being scanned by the line camera (11), and a suction box (60) located immediately before the suction roller (50) and cooperating with the second side of the printed sheets for aspirating at least a portion of the second side of the printed sheets against a substantially flat surface (60a) of the suction box (60) before contacting the suction roller (50).
Abstract:
There is described a sheet-fed rotary printing press (100; 200; 300) for the production of banknotes and like securities comprising at least one printing form cylinder (115, 125; 215; 315, 325). A nominal diameter (D) of the at least one printing form cylinder (115, 125; 215; 315, 325) substantially corresponds to an integer multiple of a reference diameter of a one-segment cylinder (103a, 103c, ...) as used for printing onto super-format sheets. An axial length (AL) of the at least one printing form cylinder (115, 125; 215; 315, 325) is comparatively greater than a nominal axial length of a corresponding printing form cylinder as used for printing onto super-format sheets, by an amount such that the at least one printing form cylinder (115, 125; 215; 315, 325) is suitable for printing onto large-format sheets having a comparatively greater width (W) than a width of super-format sheets. A circumferential length (SL) of each segment of the at least one printing form cylinder (115, 125; 215; 315, 325) is comparatively greater than a nominal circumferential length of each segment of a corresponding printing form cylinder as used for printing onto super-format sheets, by an amount such that the at least one printing form cylinder (115, 125; 215; 315, 325) is suitable for printing onto large-format sheets having a comparatively greater length (L) than a length of super-format sheets.
Abstract:
There is described an adjustable drive unit of a printing press (1; 1*), which adjustable drive unit (25) is interposed between a rotating input body (100) and a rotating output body (23, 200; 23*, 200) to allow selected adjustment of a rotational speed of the rotating output body (23, 200; 23*, 200) with respect to a rotational speed of the rotating input body (100). In an adjusting state of the adjustable drive unit (25), driving into rotation of the rotating output body (23, 200; 23*, 200) is adjusted by means of an adjustment motor (300) of the adjustable drive unit (25). In a non-adjusting state of the adjustable drive unit (25), the adjustment motor (300) is inoperative and driving into rotation of the rotating output body (23, 200; 23*, 200) is performed exclusively mechanically via the adjustable drive unit (25), the rotating output body (23, 200; 23*, 200) rotating at a defined rotational speed with respect to the rotating input body (100). Also described is a printing press, especially an intaglio printing press (1;1*) comprising such an adjustable drive unit (25).
Abstract:
There is described a method of detecting security features (41-49; 30; 10; 51, 52) printed, applied or otherwise provided on security documents, in particular banknotes, which security features (41-49; 30; 10; 51, 52) comprise characteristic visual features intrinsic to the processes used for producing the security documents. The method comprises the steps of digitally processing a sample image (c 0 ) of at least one region of interest (R.o.I.) of the surface of a candidate document, which region of interest (R.o.I.) is selected to include at least a portion of said security features (41-49; 30; 10; 51, 52), which digital processing includes performing one or more iterations (N) of a multiresolution analysis (MRA) of the sample image (c 0 ) to extract classifying features (Ã 2 , C, ...) which are characteristic of said security features (41-49; 30; 10; 51, 52).
Abstract:
There is described a method of detecting security features (41-49; 30; 10; 51, 52) printed, applied or otherwise provided on security documents, in particular banknotes, which security features (41-49; 30; 10; 51, 52) comprise characteristic visual features intrinsic to the processes used for producing the security documents. The method comprises the steps of digitally processing a sample image (c 0 ) of at least one region of interest (R.o.I.) of the surface of a candidate document, which region of interest (R.o.I.) is selected to include at least a portion of said security features (41-49; 30; 10; 51, 52), which digital processing includes performing one or more iterations (N) of a multiresolution analysis (MRA) of the sample image (c 0 ) to extract classifying features (Ã 2 , C, ...) which are characteristic of said security features (41-49; 30; 10; 51, 52).
Abstract:
There is described a method of detecting security features (41-49; 30; 10; 51, 52) printed, applied or otherwise provided on security documents, in particular banknotes, which security features (41-49; 30; 10; 51, 52) comprise characteristic visual features intrinsic to the processes used for producing the security documents. The method comprises the steps of digitally processing a sample image (c 0 ) of at least one region of interest (R.o.I.) of the surface of a candidate document, which region of interest (R.o.I.) is selected to include at least a portion of said security features (41-49; 30; 10; 51, 52), which digital processing includes performing one or more iterations (N) of a multiresolution analysis (MRA) of the sample image (c 0 ) to extract classifying features (σ 2 , C, ...) which are characteristic of said security features (41-49; 30; 10; 51, 52).
Abstract:
There is described a method of checking the authenticity of security documents, in particular banknotes, wherein authentic security documents comprise security features (41-49; 30; 10; 51, 52) printed, applied or otherwise provided on the security documents, which security features comprise characteristic visual features intrinsic to the processes used for producing the security documents. The method comprises the steps of digitally processing a sample image (c 0 ) of at least one region of interest (R.o.l.) of the surface of a candidate document to be authenticated, which digital processing includes performing one or more iterations (N) of a multiresolution analysis (MRA) of the sample image (c 0 ).
Abstract:
There is described an inspection system (10) for inspecting the quality of printed sheets being transported by a sheet conveyor system comprising at least one sheet gripper system (3a, 3b) including a plurality of spaced-apart gripper bars (32) for holding the printed sheets by a leading edge thereof. The inspection system (10) is placed along the path of the at least one sheet gripper system (3a, 3b) transporting the printed sheets and comprises an optical quality control apparatus for carrying out inspection of a first side of the printed sheets while the printed sheets are being transported by the sheet gripper system (3b). The optical quality control apparatus includes a line camera (11) for scanning the first side of the printed sheets. The inspection system (10) further comprises a suction roller (50) that is placed in front of the optical path (B) of the line camera (11) along the path (A) of the printed sheets being transported by the sheet gripper system (3b), which suction roller (50) contacts a second side of the printed sheets opposite to the first side which is being scanned by the line camera (11), and a suction box (60) located immediately before the suction roller (50) and cooperating with the second side of the printed sheets for aspirating at least a portion of the second side of the printed sheets against a substantially flat surface (60a) of the suction box (60) before contacting the suction roller (50).