Measuring table for carrying out measuring tasks on a sheet printed in a printing press

Abstract

The invention relates to a measuring table for carrying out measuring tasks on a printed sheet printed in a printing press, comprising a sheet support surface for placing the printed sheet, wherein at least one suction device generating a negative pressure is arranged below the sheet support surface, wherein this suction device is designed such that, in the operating state of its activation triggered by a control unit, it holds a printed sheet resting on the sheet support surface in a force-fitting manner by means of an air pressure which is reduced compared to the barometric air pressure, wherein at least a partial surface of the sheet support surface is formed from a microporous block material with a natural porosity of at least 20%,wherein the block material is an inorganic non-metallic material and is permeable to air over its entire surface due to its microporous structure, and wherein the block material has, by means of an engraving introduced into it, a position for the placement of the printed sheet to be placed on the sheet support surface or a ruler for measuring the printed sheet in question.

Claims

[1] Measuring table for carrying out measuring tasks on a printed sheet (11) printed in a printing press, comprising a sheet support surface (01) for placing the printed sheet (11), wherein at least one suction device (12) generating a negative pressure is arranged below the sheet support surface (01), wherein this suction device (12) is designed such that, in the operating state of its activation triggered by a control unit (09), it holds a printed sheet (11) resting on the sheet support surface (01) in a force-fitting manner by means of an air pressure which is reduced compared to the barometric air pressure, wherein at least one partial surface (02) of the sheet support surface (01) is formed from a microporous block material with a natural porosity of at least 20%,wherein the block material is an inorganic non-metallic material and is permeable to air over its entire surface due to its microporous structure, and wherein the block material has, by means of an engraving introduced into it, a position for the placement of the printed sheet (11) to be placed on the sheet support surface (01) or a ruler for measuring the printed sheet (11) in question. [2] Measuring table according to claim 1, characterized by that a measuring device (04) which is movable bidirectionally in at least one direction above the sheet depositing surface (01) is provided, wherein a camera (06) is arranged in the movable measuring device (04) and wherein a detection range of this camera (06) arranged in the measuring device (04) is directed onto a side of the printed sheet (11) lying on the sheet depositing surface (01) facing the measuring device (04). [3] Measuring table according to claim 2, characterized bythat above the sheet depositing surface (01) first illuminating means (14) are arranged which illuminate at least the detection area of the camera (06) arranged in the measuring device (04), said illuminating means (14) being each controlled by the control unit (09). [4] Measuring table according to claim 1 or 2 or 3, characterized by that the block material is a translucent material. [5] Measuring table according to claim 4, characterized by that second illuminating means (16) which illuminate the block material are arranged below the sheet depositing surface (01), wherein these illuminating means (16) are each controlled by the control unit (09). [6] Measuring table according to claim 5, characterized byin that the block material of the sheet depositing surface (01) has one or more zones (19) of reduced layer thickness, wherein the zone in question (19) has a brightness on the surface of the block material which differs from the remaining surface of this block material when the illuminance of the second illuminating means (16) arranged below the sheet depositing surface (01) remains unchanged. [7] Measuring table according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized by in that at least one sensor (18) is arranged in an edge region (17) of the sheet depositing surface (01), wherein the sensor in question (18) is designed such that it detects a printed sheet (11) lying on the sheet depositing surface (01) and, upon detection of a printed sheet (11) lying on the sheet depositing surface (01), sends a signal to the control unit (09). [8] Measuring table according to claim 7, characterized bythat the control unit (09) is designed such that it switches on the suction device (12) and / or the second lighting means (16) only when and as long as the relevant sensor (18) detects the resting of a printed sheet (11) on the sheet depositing surface (01). [9] Measuring table according to claim 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized by that the control unit (09) is designed such that it switches off the suction device (12) and / or the first lighting means (14) and / or the second lighting means (16) in each case after an image of the printed sheet (11) lying on the sheet depositing surface (01) has been taken by the camera (06). [10] Measuring table according to claim 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, characterized by that the measuring device (04) is driven by a drive (13), wherein the drive (13) is controlled by the control unit (09).

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