Abstract: The invention relates to a printing machine for printing a material. The printing machine comprises a conveyor belt, an optical sensor and an evaluation unit. The conveyor belt is movable in a feed direction along a feed path. The conveyor belt comprises a plurality of portions along the feed direction over the feed path. The optical sensor is arranged to detect at least one image of each portion of the plurality of portions of the conveyor belt sequentially. The evaluation unit is arranged to identify or determine a position of the conveyor belt on the basis of the images of the plurality of portions of the conveyor belt.

Abstract: A method is provided for producing a stencil having a relief with multiple openings on its upper side. The contours correspond to a desired pattern and to a stencil of this type. The stencil has a body with at least one non-perforated non-metal relief layer, which allows greater relief heights and increased freedom of design. The relief layer is removed according to the pattern by laser or plasma radiation to form the multiple openings. Through-openings extending to a rear side opposite the upper side are provided at least in the bottom region of the openings of the relief. A stencil with a stencil body may be obtained, having at least one non-metal relief layer, formed in the upper side of which is a relief with multiple openings, the contours of which correspond to a desired pattern. Through-openings extending to a rear side opposite from the upper side are provided.

Abstract: A method is provided for producing a stencil having a relief with multiple openings on its upper side. The contours correspond to a desired pattern and to a stencil of this type. The stencil has a body with at least one non-perforated non-metal relief layer, which allows greater relief heights and increased freedom of design. The relief layer is removed according to the pattern by laser or plasma radiation to form the multiple openings. Through-openings extending to a rear side opposite the upper side are provided at least in the bottom region of the openings of the relief. A stencil with a stencil body may be obtained, having at least one non-metal relief layer, formed in the upper side of which is a relief with multiple openings, the contours of which correspond to a desired pattern. Through-openings extending to a rear side opposite from the upper side are provided.

Abstract: A method for producing a stencil, which has on its upper side a relief with a multiplicity of openings, the contours of which correspond to a desired pattern, and to a stencil of this type. In order to permit greater relief heights, and consequently increased freedom of design of patterns to be applied, the stencil is provided with a body having at least one non-perforated non-metal relief layer. The material of the relief layer is removed according to the pattern by laser or plasma radiation to form the multiplicity of openings of the relief. Through-openings which extend to a rear side opposite from the upper side are provided at least in the bottom region of the openings of the relief. A stencil with a stencil body (10) may be obtained, which has at least one non-metal relief layer, formed in the upper side of which is a relief with a multiplicity of openings, the contours of which correspond to a desired pattern.

Abstract: The invention relates to a vacuum unit for a device used to structure the surface of a workpiece (20), in particular a plate such as e.g. a flexographic printing block, by means of radiation and especially laser radiation. Said unit comprises a hood (10), which in its operating position covers an interaction zone between the radiation and the surface of the workpiece, consisting of a rear face (11), to which a vacuum line (38) can be connected, two lateral walls (16) comprising end edges (19), which lie opposite the workpiece (20) in the operating position of the hood (10), and two leading walls (17, 18), which are located between the lateral walls (16), run transversally to the latter and which together with the two lateral walls (16) delimit a vacuum channel (14) in the hood (10), said channel comprising an inlet (15), which lies opposite the workpiece (20) in the operating position of said hood (10).

Abstract: The invention relates to a vacuum unit for a device used to structure the surface of a workpiece (24), in particular a plate, such as e.g. a flexographic printing block, by means of radiation, in particular laser radiation, the workpiece being a cylinder or a plate that is located on a cylinder during the engraving process. Said unit comprises a hood (11) that covers an interaction zone between the radiation and the surface of the workpiece and that has a vacuum channel (12), whose inlet (15) lies opposite the surface of the workpiece in the operating position of the hood (11) and which can be connected to a vacuum line (38). The aim of the invention is to prevent the abraded and decomposition products that form during the machining of cylindrical workpieces, such as e.g. aerosols, vapour, fumes or gases from being released into the environment.

Abstract: To produce a printing block, a relief is introduced into a surface of a printing block blank. To form the relief, material of the printing block blank is removed along tracks by radiation. The relief regions may be formed at different depths along one and the same track by frequent exposure to radiation.

Abstract: To produce a printing block, a relief is introduced into a surface of a printing block blank. To form the relief, material of the printing block blank is removed along tracks. The material is removed by radiation to form recesses, between which plateaus will be formed. The surface of the printing block blank located between the recesses is also removed by radiation in order to obtain lower-lying plateaus.

Abstract: In the production of a printing block a relief is introduced into the surface of a printing block blank (1) in that material of the printing block blank (1) is removed along tracks by radiation. For this purpose relief regions of different depths along one and the same track in each case are produced by correspondingly frequent exposure to radiation.

Abstract: Method and device for producing a printing block In a printing block a relief is introduced into the surface of a printing block blank (1) in that material of the printing block blank (1) is removed in regions along tracks by radiation in order by this means to form recesses (V) between which plateaus come to lie. According to the invention the surface of the printing block blank (1) located between the recesses (V) is also removed by radiation in order by this means to obtain lower-lying plateaus (P2).

Abstract: The invention relates to a device and to a method for applying a medium in the form of liquid, powder or paste to a substrate, having a container for the medium and a transport device which takes the medium from the container and discretely distributes it. In a propelling device the medium is selectively transferred from the transport device to the substrate with a propellant which is separate from the medium, or in the propelling device the medium is selectively removed from the transport device, and the remaining medium is transferred from the transport device to the substrate.

Abstract: An optical reading device has projection optics which have an optical axis and focus light emitted by a light source present in a reading head, and having light receiving optics, arranged horizontally with respect to the optical axis, for receiving light focused by the projection optics and reflected back from an object. The light source can be displaced along the optical axis, relative to the projection optics, in order, during the scanning of pattern originals, to be able to change the size of the scanning light point in accordance with the original structure, without a displacement of the light receiving optics being necessary.

Abstract: A device for determining the color value of light includes a linear graded interference filter, which has only one expansion direction through which the light is incident on a number of photodetectors. The photodetectors are arranged adjacent to one another in the expansion direction of the graded interference filter and are used to supply measuring signals, on the basis of which the color value is calculated. Focusing optics arranged in front of the graded interference filter are used to focus the light onto the photodetectors. The light is fed via a plurality of optical guides, whose light exit ends are arranged closely adjacent to one another along one or more rows extending in the expansion direction of the graded interference filter. The focusing optics contain a cylindrical lens extending in the expansion direction. Advantageously, the photodetectors are PIN photodiodes and the optical waveguides are optical fibers.

Abstract: An optical read head contains imaging optics for focusing incident light and light receiving optics arranged concentrically with respect to the imaging optics for receiving the light focused by the imaging optics and reflected from an object. The imaging optics and the light receiving optics are located on the same optical axis, the light receiving optics surrounding the imaging optics. The light receiving optics are also displaced forward in the direction of the incident light with respect to the imaging optics, an input face of the light receiving optics being inclined towards the optical axis. The optical read head is suitable for, among other things, the colour-selective scanning of material webs and other colour patterns and exhibits a high light receiving capability in addition to a high resolution capability.