WO2023094609A1 - Procédé et dispositif de mesure d'une pièce en forme de plaque - Google Patents

Procédé et dispositif de mesure d'une pièce en forme de plaque Download PDF

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Publication number
WO2023094609A1
WO2023094609A1 PCT/EP2022/083312 EP2022083312W WO2023094609A1 WO 2023094609 A1 WO2023094609 A1 WO 2023094609A1 EP 2022083312 W EP2022083312 W EP 2022083312W WO 2023094609 A1 WO2023094609 A1 WO 2023094609A1
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WO
WIPO (PCT)
Prior art keywords
measuring
workpiece
area
edge
method step
Prior art date
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PCT/EP2022/083312
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German (de)
English (en)
Inventor
Thilo Solawa
Harald Klein
Original Assignee
Dieffenbacher GmbH Maschinen- und Anlagenbau
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Application filed by Dieffenbacher GmbH Maschinen- und Anlagenbau filed Critical Dieffenbacher GmbH Maschinen- und Anlagenbau
Publication of WO2023094609A1 publication Critical patent/WO2023094609A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/028—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring lateral position of a boundary of the object
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures

Definitions

  • the invention relates to a method for measuring a panel-shaped workpiece and a measuring device for measuring a panel-shaped workpiece.
  • the object is achieved by means of a method according to claim 1.
  • the object is also achieved by means of a measuring device according to claim 16.
  • Advantageous developments are the subject matter of the dependent subclaims.
  • the method according to the invention for measuring a plate-shaped workpiece comprises the following method steps:
  • the conveying movement of the workpiece preferably takes place by means of a conveying device on which the workpiece rests and is conveyed through the measuring area of the measuring device.
  • the conveying movement can take place by means of a conveyor belt, a roller conveyor or a belt conveyor.
  • the workpiece has a leading front edge, a trailing rear edge and two side edges.
  • the measuring range represents a spatial area within which a quality-relevant workpiece edge can be detected in a spatially resolved manner.
  • a spatially resolved detection includes the determination of at least one spatial coordinate of a quality-relevant workpiece edge within the measuring range.
  • a determined edge point corresponds to a coordinate tuple that describes the two-dimensional position of the detected edge point in the measurement area.
  • the term workpiece edge can be understood as a workpiece edge which delimits the spatial extension of the workpiece in plan view. In particular, the workpiece edge is not identical to a corner point of the workpiece.
  • the measuring area has an inlet area and an outlet area.
  • the inlet area and the outlet area represent spatial sub-areas of the measuring area and are designed in such a way that the workpiece with its front and rear edge first traverses the inlet area and then the outlet area as a result of the conveying movement.
  • the measuring sensors of the measuring device are triggered in an event-dependent manner as soon as the workpiece reaches a measuring position.
  • the event-dependent control of the measuring sensors ensures that the edge measurement is only carried out when at least one quality-relevant workpiece edge, preferably a plurality of quality-relevant workpiece edges, in particular all quality-relevant workpiece edges, is or is within the measuring range.
  • the measuring area has dimensions that are adapted to the dimensions of the workpiece in such a way that the quality-relevant workpiece edge to be measured is located within the measuring area with a sufficiently high probability when the measuring position is detected and at least two of the measuring sensors detect two edge points of this workpiece edge.
  • the workpiece edge that is relevant to quality can be any edge of the workpiece, in particular the front edge, the rear edge or one of the two side edges.
  • the measuring sensors are each designed as line sensors.
  • the measuring sensors preferably each have a measuring axis along which a workpiece edge can be detected.
  • the measuring sensors record at least one point along their respective measuring axis, which can be assigned to at least one detected workpiece edge.
  • the edge point thus detected can preferably depend on the position and/or orientation of the respective measuring sensor and in particular its Measuring axis are used for determining a position of the edge point in the measuring range.
  • the line sensors can be designed as laser light section sensors or line sensors or as line CCD sensors.
  • the line sensors are associated with a smaller installation space, especially in comparison to cameras, and are less susceptible to faults.
  • the measuring sensors are designed in such a way that they can preferably only be used to detect exactly one point on a workpiece edge. In another optional embodiment, it is also possible to detect two points of two adjacent workpiece edges, for example in the area of a corner.
  • the measurement sensors are each designed in one piece or in one piece and preferably have an integrated light source, by means of which it is possible to create lighting conditions that promote reliable edge measurement. It is also within the scope of the invention that a light source is designed separately from the measuring sensor in order to create the lighting conditions.
  • the measurement sensors are preferably designed in such a way that no additional light source is required.
  • the front edge and/or the rear edge during the conveying movement can be used in a simple manner to detect whether the workpiece has reached the desired measuring position. This is related to the fact that the presence of the leading edge or the trailing edge in the lead-in area or in the lead-out area allows a simple conclusion to be drawn as to the area in which the rest of the workpiece is located.
  • there are different possible measurement positions for the workpiece which can be recognized individually or in combination with one another in the method according to the invention in order to trigger the edge measurement.
  • the leading edge of the workpiece is within the entry area.
  • a trigger signal can be output to at least two measuring sensors at the leading edge within the lead-in area in order to carry out an edge measurement at the leading edge in the lead-in area.
  • the detection of the leading edge can be used to trigger two measurement sensors.
  • the front edge represents a quality-relevant workpiece edge, for which two edge points are recorded in order to use them to deduce the position of the workpiece.
  • a second possible measuring position is preferably reached when the leading edge of the workpiece is within the run-out area. It is advantageous here if the remaining, trailing area of the workpiece is located within the measuring area with at least one quality-relevant workpiece edge, which preferably does not correspond to the detected front edge.
  • the trigger signal can be output to at least two measurement sensors in order to carry out an edge measurement within the measurement area and preferably outside the run-out area. It is also within the scope of the invention that the edge measurement is carried out at the second measurement position within the run-out area.
  • a third possible measurement position is preferably reached when the trailing rear edge of the workpiece is within the entry area. It is advantageous here if the remaining, leading area of the workpiece is located within the measuring area with at least one quality-relevant workpiece edge, which preferably does not correspond to the recognized rear edge.
  • the trigger signal is output to at least two measurement sensors in order to simultaneously carry out an edge measurement within the measurement area and preferably outside the lead-in area. It is also within the scope of the invention that the edge measurement is carried out at the third measurement position within the lead-in area.
  • the workpiece is located with its trailing rear edge within the run-out area.
  • the trigger signal is sent to at least two Measurement sensors issued to perform an edge measurement on the workpiece.
  • the detection of the fourth measurement position serves to trigger at least two measurement sensors in the run-out area in order to carry out an edge measurement on the trailing edge within the run-out area.
  • the detection of the trailing edge can be used to trigger two measurement sensors.
  • the rear edge represents a quality-relevant workpiece edge, for which two edge points are recorded in order to use them to ensure the quality of the workpiece.
  • further measurement sensors can be triggered in order to measure other workpiece edges that are also located in the run-out area.
  • method step D at least two measurement sensors are triggered simultaneously to carry out the spatially resolved edge measurement.
  • This makes it possible to simultaneously detect two edge points of the workpiece, in particular two edge points of a connected workpiece edge.
  • the conveying speed of the workpiece does not have to be taken into account in principle in order to be able to map the measured edge points within a common coordinate system.
  • Two, four, six or eight measuring sensors are preferably provided, which can each be controlled by only one trigger signal in order to measure two or four or six or eight edge points simultaneously.
  • the previously triggered measurement sensors each output a position of an edge point within the measurement area.
  • the edge points can be evaluated as a function of the positions and/or orientations of the measuring sensors within a common coordinate system in order to determine one or more parameters of the workpiece geometry in method step E). It is within the scope of the invention that the measured edge points are evaluated in such a way that the workpiece geometry and/or the workpiece position within the measuring range is inferred can be.
  • the measured edge points can be interpolated and/or extrapolated in a simple manner in order to be able to infer at least an edge profile of the workpiece. Since the workpiece edges are straight in their respective nominal state, it is sufficient for the quality assessment if the measured edge points, if they belong to a common workpiece edge, are connected by a straight line whose course corresponds to that of the measured workpiece edge.
  • the invention is not limited to the manner in which the leading edge or the trailing edge is detected in the lead-in area or in the lead-out area.
  • at least one of the measuring sensors and/or an additional trigger sensor which is designed as a light barrier, for example, is designed to detect the presence of the leading edge and/or the trailing edge in the entry area and/or in the exit area and in method step C) a trigger signal output to the measuring device.
  • the front or rear edge is detected depending on whether a rising or falling edge flank is detected during the conveying movement of the workpiece within the entry area or within the exit area.
  • one of the measurement sensors is used both to carry out an edge measurement and to detect at least the leading or trailing edge, it preferably has two operating modes.
  • the measurement sensor can receive a trigger signal, for example a binary control voltage, from another measurement sensor or an additional trigger sensor in order to carry out an edge measurement on a workpiece edge as a function thereof.
  • the measuring sensor itself can output the trigger signal, in particular a control voltage, to the measuring device or directly to another measuring sensor as soon as a rising or falling edge flank is in the lead-in area or in the lead-out area and is detected by the measuring sensor.
  • At least method step D) is carried out multiple times, so that edge points of the workpiece are measured multiple times in order to statistically secure the measurement result.
  • the workpiece is conveyed at least in method step A) by means of a conveying device along the conveying axis, with the workpiece protruding at least in the measuring area with at least one workpiece edge to be measured over the conveying device and with the measuring sensors being arranged below the conveying device.
  • the conveyor device is preferably divided into a number of segments, with the workpiece in the measuring area protruding over the conveyor device and/or over a segment with at least one workpiece edge to be measured between two segments.
  • the segments of the conveying device can be spaced apart from one another at least in regions along and/or transversely to the conveying axis.
  • the workpiece can be located at least at times with its front edge and/or its rear edge and/or one of its side edges between two segments and can be measured by means of at least two measuring sensors.
  • the at least two measuring sensors are preferably located below the conveyor device and between the segments of the conveyor device.
  • the conveyor device is uninterrupted along the conveyor axis and has a width transverse to the conveyor axis that is less than the width of the workpiece, so that the front edge and/or the rear edge and/or one of the side edges of the workpiece, viewed in the direction transverse to the conveying axis, protrude over the conveying device.
  • two trailing edge points of the trailing edge are simultaneously measured in a spatially resolved manner in method step D) in the run-in area by means of at least two measuring sensors.
  • method step E a course of the rear edge of the workpiece within the measuring range is preferably determined using the two rear edge points.
  • the workpiece is preferably in the second or in the third possible measuring position and with its rear edge in the entry area.
  • the trigger signal can thus be output both upon detection of the front edge in the exit area and after detection of the rear edge in the entry area in order to measure at least two rear edge points of the workpiece in the entry area with spatial resolution.
  • the two measured trailing edge points can be connected in a simple manner by means of a straight line whose course within the measuring range corresponds to the course of the trailing edge of the workpiece.
  • two front edge points of the front edge are simultaneously measured in a spatially resolved manner in method step D) in the outlet area by means of at least two measuring sensors.
  • method step E) a course of the front edge of the workpiece within the measuring range is preferably determined using the two front edge points.
  • the workpiece is preferably in the second or in the third measuring position and with its front edge in the run-out area.
  • the trigger signal can thus be output both after detection of the front edge in the exit area and after detection of the rear edge in the entry area in order to measure at least two front edge points of the workpiece in the exit area with spatial resolution.
  • the two measured points on the front edge can be connected in a simple manner by means of a straight line, the course of which corresponds to the course of the front edge of the workpiece within the measuring range
  • the measuring area comprises at least one side area, through which the workpiece is conveyed with a side edge in method step A) and in method step D) at least one side edge point is detected in the side area depending on the trigger signal by means of at least one measuring sensor.
  • the advantageous development of the method described above is based on the knowledge that, in addition to the detection of two front edge points and/or two rear edge points, it is also advantageous to detect a side edge point in order to ensure the quality of the workpiece. With just one side edge point, it is only possible under certain circumstances to determine a side edge course within the measuring range. However, it is within the scope of the advantageous development that the workpiece is aligned with its side edge points during the conveying movement along the conveying axis. Quality assurance can therefore be carried out on the side edge simply by determining just one side edge point within the measurement area and using it to infer the position of the side edge within the measurement area. If the measured side edge point is not in a target position within the measuring range or within a tolerance range, it can be concluded that the workpiece does not have the required width or is not positioned in the required manner.
  • the measurement area preferably includes two side areas and the workpiece includes two side edges, with the workpiece being conveyed in method step A) with a first side edge through a first of the two side areas and with a second side edge through a second of the two side areas.
  • method step D at least one side edge point of the first side edge is preferably detected in the first side area by means of at least one measuring sensor, and at least one side edge point of the second side edge is preferably detected in the second side area by means of at least one other measuring sensor.
  • method step D) two side edge points of a side edge are detected simultaneously in the side area depending on the trigger signal by means of two measuring sensors and in method step E) a side edge course of the side edge within the measuring area is determined with the two side edge points.
  • At least two side edge points of the first side edge are preferably detected in the first of two side areas by means of at least two measuring sensors and at least two side edge points of the second side edge are detected in the second side area by means of at least two other measuring sensors.
  • a side edge profile of the first side edge within the measurement area is preferably determined with the two side edge points of the first side edge and a side edge profile of the second side edge within the measurement area is determined with the two side edge points of the second side edge.
  • the measuring device for carrying out the method preferably has a total of eight measuring sensors, with two measuring sensors being designed and arranged to measure two edge points within the entry area in a spatially resolved manner. Two further measurement sensors are designed and arranged to measure two edge points within the outlet area in a spatially resolved manner. Two further measuring sensors are designed and arranged to measure two edge points within the first of two side areas in a spatially resolved manner and two further measurement sensors to measure two edge points within the second side area in a spatially resolved manner.
  • the workpiece is preferably in a measuring position in which the rear edge is within the entry area and the front edge is within the exit area, and in which the side edges are each within a side area. A total of eight edge points of the workpiece, in each case two edge points per workpiece edge, are preferably measured simultaneously by means of the eight measuring sensors.
  • method step B) during the conveying movement of the workpiece, at least two measuring positions of the workpiece are detected, with the trailing edge being detected in the entry area in method step B1) and a first trigger signal being output to the measuring device in method step C1). .
  • a method step B2) the leading edge is detected in the run-out area and in a method step C2) a second trigger signal is output to the measuring device.
  • a side edge point of a side edge is detected by means of at least one measuring sensor in the side area, preferably in both side areas, and in a method step D2) depending on the second trigger signal in the side area by means of the same measuring sensor as a result of the conveying movement of the workpiece another side edge point of the side edge is detected and output.
  • the workpiece is in the conveying movement during the edge measurement, while at least one measuring sensor in the side area first measures a side edge point of a side edge and then the other side edge point of the same side edge.
  • the two measured side edge points of method steps D1) and D2) can be used in particular to check whether the workpiece is aligned with the measured side edge along the conveying direction or is inclined relative to the conveying direction, especially if the side edge points are connected by a straight line .
  • the measurement sensor preferably outputs a first time stamp in method step D1) and a second time stamp in method step D2).
  • a side edge course of the workpiece within the measuring range is determined with the two measured side edge points, a conveying speed of the workpiece and the first and the second time stamp.
  • Method steps D1) and D2) preferably take place in chronological succession, with method step D2) in particular taking place after method step D1).
  • the conveying speed can be assumed to be known or can be measured or output by a control unit of the conveying device.
  • the conveying speed of the workpiece is determined by means of at least one measuring sensor in method steps D1) and/or D2).
  • a measuring sensor in the inlet area or outlet area can preferably be used to determine the conveying speed.
  • one of the measuring sensors can, for example, carry out two edge measurements offset in time relative to one another using an edge point.
  • the edge point of the measuring sensor is moved through the detection range of the measuring sensor.
  • the conveying speed can be calculated or determined in a simple manner on the basis of the displacement of the measured edge point within the detection range of the measuring sensor.
  • At least two measuring positions of the workpiece are also detected in method step B) during the conveying movement of the workpiece.
  • a method step B1) the leading edge is detected in the lead-in area and in a method step C1) a first trigger signal is output to the measuring device.
  • the trailing edge is detected in the lead-in area, and in a method step C2), a second trigger signal is output to the measuring device.
  • a method step D1) depending on the first trigger signal, two leading edge points of the leading edge are detected in the lead-in area by means of at least two measuring sensors.
  • two trailing edge points of the trailing edge are detected and at the same time, a leading edge point of the leading edge is detected in the run-out area by means of at least one measuring sensor.
  • both the front and rear edge points in the lead-in area are measured one after the other.
  • the edge points measured in this way can accordingly be assigned to the position of the leading edge and the trailing edge while carrying out method steps D1) and D2).
  • the front edge points measured in method step D1) can be relocated to the outlet area by calculation according to the conveying movement of the workpiece.
  • a leading edge point of the workpiece is measured in method step D2) in the run-out area. This leading edge point preferably corresponds to one of the leading edge points already measured in method step D1).
  • a workpiece length is preferably additionally determined as a function of a relative position between the measuring sensors used in method steps D1) and D2).
  • the measuring area comprises at least one side area through which the workpiece is conveyed with a side edge in method step A), wherein in method step D1) a side edge point is measured in the side area by means of at least one measuring sensor as a function of the first trigger signal Side edge is detected and in method step D2) depending on the second trigger signal in the side area by means of at least one other measuring sensor another side edge point of the workpiece edge is detected.
  • a side edge profile of the workpiece edge is preferably determined using the two side edge points from method step D1) and method step D2).
  • the workpiece is in the conveying movement during the edge measurement, while at least one measuring sensor in the side area first detects a side edge point side edge and then another measuring sensor measures the other side edge point.
  • Method steps D1) and D2) preferably take place in chronological succession, with method step D2) in particular taking place after method step D1).
  • the course of the side edges is preferably determined as a function of a relative position between the measuring sensors used in method steps D1) and D2).
  • a workpiece length and/or a workpiece width and/or a relative orientation of at least two workpiece edges and/or a position of the workpiece is determined in method step E) depending on the rear edge profile and/or the front edge profile and/or at least one side edge profile within the measuring area determined within the measuring range.
  • the traces of the rear edge, the front edge and the side edges that can be determined are used individually or in combination with one another to determine the geometry and the dimensions of the workpiece.
  • the workpiece length and the workpiece width can be determined between any two edge points of the rear edge and front edge or the side edges.
  • the determination of the relative orientation of two workpiece edges can be used to evaluate parallelism between the front edge and the rear edge and/or between the side edges.
  • the determination of the relative orientation of two workpiece edges can be used to evaluate a predetermined angularity between all workpiece edges.
  • the determination of the edge profiles is based on two measuring steps according to the method steps D1) and D2), it is advantageous if the workpiece geometry or the workpiece dimensions are determined as a function of the relative position, in particular a distance between two measuring sensors, which occurs in the two method steps D1 ) and D2) were used. As a result, edge measurements that are offset in time can also be combined with a high level of reliability for quality assurance.
  • at least one measuring sensor and/or the additional trigger sensor is adjusted along the conveying axis before method step A) in order to adapt a longitudinal dimension of the measuring area to an expected workpiece length.
  • At least one measuring sensor can be adjusted orthogonally to the conveying axis and depending on an expected workpiece width, in order to adapt a transverse dimension of the measuring area to an expected workpiece width. Furthermore, additionally or alternatively, at least one measuring sensor can be adjusted at an angle to the conveying axis.
  • the dimensions of the measuring area are not fixed, but can be adapted to different workpieces.
  • the method can thus also be carried out on workpieces which have a high variance with regard to their length and/or width.
  • a zero adjustment of the measuring sensors is carried out using a measuring standard
  • method steps A) to E) are carried out with the measuring standard instead of a workpiece and the measuring sensors are dependent a comparison between at least one determined standard geometry and the actual standard geometry can be adjusted.
  • the measuring standard which in particular consists of a thermally invariant material such as Invar or Zerodur, can first be measured using a reference measuring device, for example a tactile coordinate measuring device or an optical measuring device. This determines the actual standard geometry, which includes all relevant edge points of the measurement standard. The normal geometry is then determined using method steps A) to E) and at least the edge points considered relevant to quality are measured. By comparing the actual and the determined normal geometry, it can be determined whether and to what extent the measurement results of the measuring device and the reference measuring device differ. Subsequent adjustment increases the measuring accuracy of the measuring device.
  • a reference measuring device for example a tactile coordinate measuring device or an optical measuring device.
  • a distance between at least two measuring sensors of the measuring device can be determined in method step 0) using at least one reference element, which preferably extends parallel to a thermal deformation axis of the measuring device, or a distance sensor.
  • the parameters of the workpiece geometry and/or the workpiece position are determined in method step E) as a function of the distance determined in method step 0).
  • the method according to the invention or an advantageous development thereof can be carried out in environments in which high temperature fluctuations can occur.
  • a reference element in order to be able to determine the distance between the measurement sensors of the measurement device with high precision and, in particular, independently of any temperature influence.
  • the reference element can be designed as a thermally invariant quartz rod, which has a grid, by means of which a distance or a distance deviation between two measuring sensors can be determined quantitatively.
  • a distance sensor can also be used to determine the distance between the measurement sensors. This deviation can be taken into account in different ways in method step E), for example in a computational correction when determining the workpiece geometry.
  • the edge points of the workpiece edges are preferably detected and a workpiece geometry or the position of a workpiece edge is determined according to a predetermined aspect, for example when the workpiece is in the first, second, third and/or fourth measuring position.
  • the result of a detection of edge points of a workpiece edge can be discarded depending on the detection of further measuring sensors, for example if the further measuring sensors could not detect any edge points.
  • the object is also achieved by the measuring device according to the invention for measuring a plate-shaped workpiece, which is preferably suitable for carrying out the method according to the invention or an advantageous development of the method.
  • the measuring device includes a plurality of non-contact measuring sensors.
  • the measuring sensors are each designed as line sensors and are used to carry out a spatially resolved edge measurement on a plate-shaped workpiece conveyed through the measuring area and along a conveying axis and to determine at least one edge point, in particular one edge point for each workpiece edge.
  • the measuring area along the conveying axis comprises an infeed area and an outfeed area and at least one of the measuring sensors and/or an additional trigger sensor is arranged and designed in such a way that a rear edge occurs during a conveying movement of the workpiece within the infeed area or the outfeed area or to detect a leading edge of the workpiece.
  • the measuring sensor and/or the trigger sensor are connected to the measuring device in terms of signal technology in order to output at least one trigger signal to the measuring device for spatially resolved edge measurement of the workpiece when the rear edge and/or the front edge is detected.
  • One of the measuring sensors is preferably a laser light section sensor or a line sensor or a CCD line sensor.
  • the measuring sensors are preferably arranged below a conveyor device, in particular a conveyor belt, a roller conveyor or a belt conveyor or chain conveyors, which are each designed to convey the workpiece to be measured with the conveying movement through the measuring area.
  • the measuring area is designed in such a way that the workpiece reaches the measuring area with at least one quality-relevant workpiece edge during its conveying movement.
  • the quality-relevant workpiece edge can be the Act leading edge, the trailing edge or at least one of two side edges.
  • a number of measuring sensors can preferably be arranged above and a number of measuring sensors below that of the conveying device. Alternatively or additionally, however, all measuring sensors can also be arranged above or all measuring sensors below the conveying device.
  • the measuring sensors are arranged below the conveying device, it can have corresponding recesses or openings in order to enable a corresponding measurement by means of the measuring sensors.
  • An arrangement of at least one measuring sensor or several measuring sensors below the conveyor has the advantage that the distance between a workpiece surface and the measuring sensor is independent of the thickness of the workpiece and thus always remains constant.
  • An arrangement of measuring sensors above the conveying device has the advantage that they are less affected by external influences, for example dust deposits.
  • the measuring device preferably has an evaluation unit which is designed to record the edge points determined by means of the measuring sensors and to process them in such a way that they can be mapped in a common coordinate system, in particular depending on the relative positions of the measuring sensors to one another. This makes it possible to combine at least two edge points that were detected by different measuring sensors, for example within a common coordinate system, and to use them to determine a workpiece geometry or workpiece dimensions. To determine the workpiece geometry, the edge points determined for each workpiece edge can be connected to form straight lines, the corresponding workpiece geometry resulting from this in the common coordinate system.
  • At least two measuring sensors can be triggered in an event-controlled manner in order to simultaneously carry out a measurement of at least two edge points of a workpiece edge as a function of the corresponding trigger signal.
  • at least two measurement sensors are arranged and designed in such a way that they measure a front edge point of the front edge and/or a rear edge point of the rear edge depending on the trigger signal in the run-in area. Additionally or alternatively, at least two measurement sensors are arranged and designed in such a way to measure a front edge point of the front edge and/or a rear edge point of the rear edge depending on the trigger signal in the run-out area.
  • the edge points of the trailing edge in the run-in area and the edge points of the leading edge in the run-out area can be determined simultaneously and as a function of the trigger signal when the workpiece edges are completely within the measuring range.
  • At least one measuring sensor which is designed to detect a leading edge point or a trailing edge point within the entry area or the exit area, is configured as a laser light section sensor or line sensor.
  • the measuring sensor preferably has a detection area which essentially extends along a measuring axis and is preferably aligned with its measuring axis parallel to the conveying axis of the workpiece. It is within the scope of the advantageous development that the trigger signal can be output with a time delay.
  • the measuring area comprises at least one side area and at least one measuring sensor is arranged and designed to measure a side edge point of a side edge in a spatially resolved manner in the side area.
  • the measuring area of the measuring device has the side area in addition to the inlet and outlet areas in order to determine a side edge point and preferably depending on this to be able to determine a side edge course of the workpiece within the measuring area .
  • At least one measuring sensor of the measuring device is mounted so that it can be adjusted orthogonally and/or parallel to the conveying axis of the workpiece in order to set a dimension of the measuring area.
  • at least one measuring sensor can be arranged at an angle to the conveying axis, with the angle preferably being adjustable.
  • the measuring sensor can be adjusted by means of a controllable actuator.
  • it can be an electrically controllable actuator.
  • the actuator is preferably controlled by means of a control unit as a function of the dimensions of an incoming workpiece.
  • the measurement sensors are arranged in such a way that the measurement area is designed in the shape of a frame.
  • the advantage of a measuring area designed in the form of a frame is that the measuring sensors can be designed and arranged in such a way that their respective detection areas do not have to cover the entire workpiece. Instead, the measuring area can be designed in such a way that it essentially corresponds to the course of the workpiece edges of the workpiece. The workpiece edges and preferably the workpiece corners of the workpiece to be measured can be completely enclosed by the measuring area.
  • the measurement area preferably has a frame width which depends on a dimension of at least one of the measuring sensors and/or its detection range. As a result, the dimensions of the measuring area can be set as a function of the measuring sensor used and in this case can preferably be adapted to the dimensions of the workpiece to be expected.
  • At least one measuring sensor extends essentially along a measuring axis and is arranged in such a way that the measuring axis of the measuring sensor and the conveying axis of the workpiece enclose an acute angle, with the measuring sensor extending partially into the inlet area or into the outlet area and partly extends into the side area in order to measure a front edge point or a rear edge point of the workpiece and additionally a side edge point of the workpiece depending on the trigger signal.
  • the device preferably has a total of four measuring sensors arranged in this way in order to be able to measure eight edge points as a function of the trigger signal.
  • At least one measuring sensor is designed as a distance sensor and has at least one measuring axis, which is in particular aligned orthogonally to the conveying axis, the distance sensor being arranged in such a way as to detect a side edge point of a side edge in the side area.
  • the measuring sensor designed as a distance sensor can easily be designed as a laser distance sensor and is preferably arranged in such a way that its detection area extends laterally into the conveying area of the workpiece to be measured. During the conveying movement of the workpiece, it enters the detection range of the distance sensor, so that the distance sensor can determine a side edge point on a side surface of the workpiece.
  • At least one measuring sensor is arranged on a thermally invariant carrier element.
  • the arrangement of the measuring sensor on the thermally invariant carrier element makes it possible to reduce temperature-related influences on the measuring accuracy of the measuring device.
  • the measuring device for determining a relative position, in particular a distance, between two measuring sensors, preferably all measuring sensors includes at least one distance sensor.
  • the relative position of two measuring sensors, preferably all measuring sensors, in particular their distance from one another can be determined by means of at least one distance sensor. In this way, the position of the measuring sensors in relation to one another can be determined at any time.
  • the method according to the invention or an advantageous development thereof is preferably suitable for being carried out with the measuring device according to the invention or an advantageous development thereof.
  • the measuring device according to the invention or an advantageous development thereof is preferably suitable for carrying out the method according to the invention or an advantageous development thereof.
  • FIG. 1 shows a plate-shaped workpiece to be measured with four
  • Figure 2 shows a first embodiment of a measuring device for
  • Figure 3 shows a second embodiment of a measuring device for
  • FIGS. 4a), 4b) a third exemplary embodiment of a measuring device for measuring a plate-shaped workpiece at different points in time;
  • FIGS. 5a), 5b) a fourth exemplary embodiment of a measuring device for measuring a plate-shaped workpiece at different points in time;
  • FIGS. 6a), 6b) a fifth exemplary embodiment of a measuring device for measuring a plate-shaped workpiece at different points in time;
  • FIGS. 7a), 7b) a sixth exemplary embodiment of a measuring device for measuring a plate-shaped workpiece at different points in time;
  • FIG. 1 shows a conveyor belt as a conveyor device 1, by means of which a panel-shaped workpiece 2 is conveyed along a conveying axis 7.
  • a roller conveyor or roller bar conveyor can also be used as the conveyor device 1 .
  • the workpiece 2 comprises a front edge 3, a rear edge 4 and two side edges 5 and 6.
  • FIG. 2 shows the workpiece 2 according to FIG. 1, which has reached the measuring area 8 of a measuring device 9 as a result of its conveying movement.
  • the measuring device 9 comprises eight non-contact measuring sensors 10′, 10′′, 11′, 11′′, 12′, 12′′, 13′, 13′′, each of which is designed as a photosensitive line sensor whose respective detection area extends essentially along a sensor’s own measuring axis.
  • the conveyor belt 1 has several segments 1'. 1", 1'", 1"", 1""', which are spaced apart from one another along the conveying axis 7.
  • the workpiece 2 temporarily rests on the segments 1", 1" and 1"", with its edges 3, 4, 5, 6 over the segments 1", 1" and 1"". protrude.
  • the segments 1 '. 1", 1'", 1"", 1""' each extend along the conveying axis 7, so that the areas in between also essentially extend along the conveying axis 7.
  • the gaps between the segments '. 1", T", 1", 1""' extend both along the conveying axis and transversely to it.
  • the segments T. 1", 1'", 1"", 1""' can, for example, also be rollers of a roller conveyor.
  • the measuring sensors 10' and 10'' are aligned with their measuring axes parallel to the conveying axis 7 of the conveyor belt 1 located above them and are arranged in an inlet area 14 of the measuring area 8.
  • the measuring sensors 11' and 11'' are also aligned with their measuring axes parallel to the conveying axis 7 of the conveyor belt 1 located above them and are arranged in an outlet area 15 of the measuring area 8.
  • the measuring sensors 12' and 12'' are aligned with their respective measuring axes orthogonally to the conveying axis 7 of the conveyor belt 1 located above them and are arranged in a first side area 16 of the measuring area 8.
  • the measuring sensors 13' and 13'' are also aligned with their respective measuring axes orthogonally to the conveying axis 7 of the conveyor belt 1 located above them and are arranged in a second side area 17 of the measuring area 8.
  • some of the measuring sensors 10', 10", 1T, 11", 12', 12", 13', 13” can be arranged above and below the conveyor belt 1 or a conveyor device 1. All measuring sensors 10', 10", 11', 11", 12', 12", 13', 13" can also be arranged above the conveyor belt 1 or a conveyor device 1.
  • the measuring device 8 with its measuring sensors 10′, 10′′, 1T, 11′′, 12′, 12′′, 13′, 13′′ is used to measure the geometry and dimensions of the workpiece 2 during its movement through the measuring area 8 to determine a large number of edge points.
  • edge points are measured for the front edge 3, the rear edge 4 and the two side edges 5, 6 of the workpiece 2. Due to the rectilinear course of the workpiece edges, it is possible to reconstruct the outer contours of the workpiece 2 using the measured edge points and to draw conclusions about its geometry and its dimensions.
  • a trigger sensor 18 or 19 in the form of a light barrier is arranged in the inlet area 14 and in the outlet area 15 . These are used to identify whether the front edge 3 of the workpiece 2 is within the outlet area 15 and/or whether the rear edge 4 is inside the inlet area 14 .
  • the trigger sensors 18 and 19 detect whether the front edge 3 and rear edge 4 of the workpiece 2 are in at least one of the positions described above, the trigger sensors 18, 19 alone or together emit a trigger signal to the measuring device 9, which then Measuring sensors 10', 10", 1 T, 11", 12', 12", 13', 13" are triggered simultaneously.
  • FIG. 3 shows the workpiece 2 according to FIG.
  • the device does not have eight but only four measuring sensors 10', 11', 12' and 13'. These are each designed as photosensitive line sensors whose detection areas each extend essentially along a sensor's own measuring axis.
  • the measuring sensors 10', 1T, 12' and 13' are arranged with their respective measuring axes opposite the conveying axis 7 of the workpiece 2 in such a way that between the conveying axis and the measuring axes of the measuring sensors 10', 11', 12' and 13' acute angle is included. This makes it possible to use one of the measuring sensors to measure two edge points of two different workpiece edges in a spatially resolved manner in a single measurement recording.
  • the conveyor device 1 has the segments T, 1′′ and T′′, which are spaced apart from one another along the conveyor axis 7 .
  • the workpiece 2 rests on the segment 1′′ so that its workpiece edges 3, 4, 5 and 6 protrude between the segments 1′ and 1′′ and between the segments 1′′ and T′′.
  • the measurement sensors 10', 1T, 12' and 13' are arranged below the segments T, 1" and T" and each detect two edge points.
  • the measuring sensor 10 ′ is arranged in such a way that its detection area protrudes both into the inlet area 14 and into the first side area 16 .
  • the measuring sensor 11 ′ is arranged in such a way that its detection area protrudes both into the inlet area 14 and into the second side area 17 .
  • the measuring sensor 12 ′ is arranged in such a way that its detection area protrudes both into the outlet area 15 and into the first side area 16 .
  • the measuring sensor 13 ′ is arranged in such a way that its detection area protrudes both into the outlet area 15 and into the second side area 17 .
  • the measurement sensors can be triggered by the leading edge 2 being detected by at least one of the measurement sensors 12' or 13' in the run-out area 15 and/or by the rear edge 4 being detected by at least one of the measurement sensors 10' or 1 T in the Lead-in area 14 is recognized.
  • the edge measurement by means of the measurement sensors 10', 11', 12' and 13' takes place simultaneously and as a function of a trigger signal which is output by the measurement sensor which detects the front edge 3 or rear edge 4.
  • FIG. 4 shows the workpiece 2 according to FIG.
  • the workpiece 2 reaches two different measuring positions, which are shown in views a) and b).
  • the measuring device 9 according to FIG. 4 includes seven measuring sensors 10', 10", 11', 11", 12', 12" and 13'. These are each designed as photosensitive line sensors and have a detection area which extends essentially along a sensor's own measuring axis.
  • the measuring sensors 10 ′ and 10 ′′ are aligned with their measuring axes parallel to the conveying axis of the conveyor belt 1 located below them and are arranged in an inlet area 14 of the measuring area 8 .
  • the conveyor belt 1 is shown in one piece, but can be divided into several segments T, 1", 1 . . . in accordance with the descriptions of FIGS.
  • the measuring sensors 1T and 11′′ are also aligned with their measuring axes parallel to the conveying axis of the conveyor belt 1 below them and are arranged in an outlet area 15 of the measuring area 8 .
  • the measuring sensors 12' and 12'' are aligned with their measuring axes orthogonal to the conveying axis of the conveyor belt 1 located below and are arranged in a first side area 16 of the measuring area 8.
  • the measuring sensor 13 ′ is also aligned with its measuring axis orthogonally to the conveying axis of the conveyor belt 1 located below and is arranged in a second side area 17 of the measuring area 8 .
  • the trailing edge 4 is in the entry area 14 of the measuring area 8.
  • the presence of the trailing edge 4 is detected by means of the trigger sensor 18 and a first trigger signal is sent to the measuring sensors 10' , 10" as well as 12' and 13'.
  • the measuring sensors 10' and 10" each detect an edge point of the rear edge 4, while the measuring sensors 12', 12" and 13' each detect an edge point of the side edges 5, 6 of the workpiece 2.
  • the workpiece 2 then moves into the second measuring position according to view b) of Figure 4.
  • the workpiece 2 In this second measuring position, the workpiece 2 is located with its front edge 3 in the run-out area 15 of the measuring area 8.
  • the presence of the front edge 3 is detected by means of the trigger sensor 19 and a second trigger signal is output to the measuring sensors 11′, 11′′ and 12′, 12′′ and 13′.
  • the measuring sensors 11' and 11" each detect an edge point of the rear edge 4, while the measuring sensors 12', 12" and 13', in addition to the already detected edge point of the side edges 5, 6, each have a further edge point of the side edges 5, 6 record.
  • a front edge profile and a rear edge profile can be determined for the workpiece within the measuring range.
  • a side edge course for the side edge 5 can already be determined by the first measurement using the measuring sensors 12' and 12''.
  • the second measurement using the Measuring sensors 12′ and 12′′ make it possible to verify a side edge profile of the side edge 5 or, for example, to form an average value for the side edge profile and to increase the reliability of the measurement.
  • a side edge profile can be determined using the side edge 6 in that the trigger sensors 18 and 19 each output a time stamp at their respective trigger times, which can be used together with the conveying speed of the workpiece to determine the side edge profile.
  • FIG. 5 shows the workpiece 2 according to FIG.
  • the workpiece 2 reaches two different measuring positions, which are shown in views a) and b).
  • the measuring device 9 according to FIG. 5 comprises six measuring sensors 10', 10", 11', 11", 12' and 13'. These are each designed as photosensitive line sensors and have a detection area which extends essentially along a sensor's own measurement axis.
  • the measuring sensors 10' and 10'' are aligned with their measuring axes parallel to the conveying axis 7 of the conveyor belt 1 located below them and are arranged in an inlet area 14 of the measuring area 8.
  • the conveyor belt 1 is shown in one piece, but can be divided into several segments T, 1", T", . . . in accordance with the descriptions of FIGS.
  • the measuring sensors 11' and 11'' are also aligned with their measuring axes parallel to the conveying axis 7 of the conveyor belt 1 located below them and are arranged in an outlet area 15 of the measuring area 8.
  • the measuring sensor 12 ′ is aligned with its measuring axis orthogonally to the conveying axis 7 of the conveyor belt 1 located below and is arranged in a first side area 16 of the measuring area 8 .
  • the measuring sensor 13 ′ is also aligned with its measuring axis orthogonally to the conveying axis 7 of the conveyor belt 1 located below and is arranged in a second side area 17 of the measuring area 8 .
  • this is located with its rear edge 4 in the entry area 14 and with its front edge 3 in the exit area 15 of the measuring area 8.
  • the presence of the rear edge 4 is detected by the trigger sensor 18 and a first trigger signal is output to the measurement sensors 10', 10", 1T, 11" and 12' and 13'.
  • the triggered measurement sensors 10', 10" each detect an edge point of the rear edge 4, while the triggered measurement sensors 11 11" each detect an edge point of the front edge 3 and the measurement sensors 12' and 13' each detect an edge point of the side edge 5, 6 capture.
  • the workpiece 2 then moves into the second measuring position according to view b) of Figure 5.
  • this second measuring position its rear edge 4 is still in the entry area 14 and its front edge 3 is still in the exit area 15 of the measuring area 8.
  • the presence of the The leading edge 3 is detected by the trigger sensor 19 and a second trigger signal is output to the measurement sensors 10', 10", 11', 11" and 12' and 13'.
  • the triggered measuring sensors 10', 10" each detect an edge point of the trailing edge 4, while the triggered measuring sensors 11', 11" each detect an edge point of the leading edge 3 and the measuring sensors 12' and 13' each detect a further edge point of the previous one side edges 5, 6 that have already been measured.
  • FIG. 6 shows the workpiece 2 according to FIG. The workpiece 2 reaches two different measuring positions, which are shown in views a) and b).
  • the measuring device according to FIG. 6 comprises six measuring sensors 10', 10", 1T, 12', 13' and 13". These are each designed as photosensitive line sensors and have a detection area which extends essentially along a measuring axis.
  • the measuring sensors 10' and 10'' are aligned with their measuring axes parallel to the conveying axis 7 of the conveyor belt 1 located below them and are arranged in an inlet area 14 of the measuring area 8.
  • the conveyor belt 1 is shown in one piece, but can be divided into several segments T, 1", T", . . . in accordance with the descriptions of FIGS.
  • the measuring sensor 1 T is also aligned with its measuring axis parallel to the conveying axis 7 of the conveyor belt 1 located below it and is arranged in an outlet area 15 of the measuring area 8 .
  • the measuring sensor 12' is aligned with its measuring axis orthogonally to the conveying axis 7 of the conveyor belt 1 located below and is arranged in a first side area 16 of the measuring area 8.
  • the measuring sensors 13' and 13'' are also aligned with their respective measuring axes orthogonally to the conveying axis 7 of the conveyor belt 1 located below and are arranged in a second side area 17 of the measuring area 8.
  • the workpiece 2 In the first measuring position of the workpiece 2, which is shown in view a) of Figure 6, the workpiece 2 is located with its front edge 3 in the entry area 14. This is detected by a trigger sensor 18 also arranged in the entry area 14, whereupon this outputs the first trigger signal to the measurement sensors 10', 10" and 13'.
  • the measuring sensors 10' and 10'' In this first measuring position, the measuring sensors 10' and 10'' each determine an edge point of the front edge 3.
  • the measuring sensor 13' determines an edge point of the side edge 5, 6 inside of the side area 17.
  • the workpiece 2 then reaches the second measuring position, which is shown in view b) of FIG.
  • the workpiece 2 is located with its rear edge 4 in the entry area 14. This is detected by the trigger sensor 18, which is also arranged in the entry area 14, whereupon this sends a second trigger signal to the measuring sensors 10', 10", 13" and 11 '.
  • the measuring sensors 10' and 10" each determine an edge point of the rear edge 4 in this second measuring position.
  • the measuring sensor 13" determines an edge point on the side edge 5, 6 for which an edge point was already determined in the first measuring position by means of the measuring sensor 13'.
  • the measuring sensor 11' determines an edge point on the front edge 3, which protrudes into the outlet area 15.
  • the workpiece geometry From the totality of the edge points measured in the first and second measuring position. In particular, this takes place depending on how the measuring sensors 10', 10", 11', 12', 13' and 13" are arranged in relation to one another. In particular, this occurs depending on the distance 20 between the measuring sensor 11' and the measuring sensor 13' and depending on the distance 21 between the two measuring sensors 13' and 13".
  • FIG. 7 shows the workpiece 2 according to FIG. In the process, the workpiece 2 reaches two different measurement positions, which are shown in views a) and b).
  • the measuring device according to FIG. 7 comprises seven measuring sensors 10', 10", 1T, 12', 12", 13' and 13". These are each designed as photosensitive line sensors and have a detection area which extends essentially along a measuring axis.
  • the measuring sensors 10 ′ and 10 ′′ are aligned with their respective measuring axes parallel to the conveying axis 7 of the conveyor belt 1 located below them and are arranged in an inlet area 14 of the measuring area 8 .
  • the Measuring sensor 11 ′ is also aligned with its measuring axis parallel to the conveying axis 7 of the conveyor belt 1 located below it and is arranged in an outlet area 15 of the measuring area 8 .
  • the conveyor belt 1 is shown in one piece, but can be divided into several segments 1', 1", 1'", . . . in accordance with the descriptions of FIGS.
  • the measuring sensors 12' and 12'' are aligned with their measuring axes orthogonal to the conveying axis 7 of the conveyor belt 1 located below and are arranged in a first side area 16 of the measuring area 8.
  • the measuring sensors 13' and 13'' are also aligned with their respective measuring axes orthogonally to the conveying axis 7 of the conveyor belt 1 located below and are arranged in a second side area 17 of the measuring area 8.
  • the workpiece 2 In the first measuring position of the workpiece 2, which is shown in view a) of Figure 7, the workpiece 2 is located with its front edge 3 in the entry area 14. This is detected by a trigger sensor 18 also arranged in the entry area 14, whereupon this a outputs the first trigger signal to the measuring sensors 10', 10'' and 12' and 13'. In this first measuring position, the measuring sensors 10' and 10" each determine an edge point of the front edge 3. The measuring sensors 12' and 13' each determine an edge point of the side edges 5, 6 within the side regions 16 and 17. The workpiece 2 then arrives as a result of its Conveying movement into the second measuring position, which is shown in view b) of FIG.
  • the workpiece 2 is located with its rear edge 4 in the entry area 14. This is detected by the trigger sensor 18, which is also arranged in the entry area 14, whereupon this sends a second trigger signal to the measuring sensors 10', 10", 12", 13" and 11 ' outputs.
  • the measuring sensors 10' and 10" each determine an edge point of the rear edge 4 in this second measuring position.
  • the measuring sensors 12" and 13" each determine an edge point on the side edges 5, 6 to those in the first measuring position already by means of the measuring sensors 12' and 13 ' one edge point has already been determined.
  • the measuring sensor 10 ′ determines an edge point on the front edge 3 which protrudes into the run-out area 15 .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un procédé de mesure d'une pièce en forme de plaque (2), comprenant les étapes suivantes consistant : A) à transporter la pièce (2) le long d'un axe de transport (7) dans une région de mesure (8) d'un dispositif de mesure (9) comportant une pluralité de capteurs de mesure sans contact (10', 10'', 11', 11'', 12', 12'', 13', 13'') qui se présentent chacun sous la forme de capteurs linéaires et qui sont configurés pour détecter chacun au moins un point de bord de la pièce (2) avec résolution spatiale à l'intérieur de la région de mesure (8) ; B) à détecter une position de mesure de la pièce (2) par la détection d'un bord arrière (4) et/ou d'un bord avant (3) de la pièce (2) dans une région d'écoulement entrant (14) et/ou dans une région d'écoulement sortant (15) de la région de mesure (8) ; C) à émettre en sortie au moins un signal de déclenchement vers le dispositif de mesure (9) dès que la position de mesure de la pièce (2) est détectée ; D) à mesurer les bords de la pièce (2) au moyen des capteurs de mesure (10', 10'', 11', 11'', 12', 12'', 13', 13'') du dispositif de mesure (9), au moins deux des capteurs de mesure (10', 10'', 11', 11'', 12', 12'', 13', 13'') étant déclenchés en même temps en fonction du signal de déclenchement afin de déterminer au moins deux points de bord de la pièce (2), de préférence deux points de bord pour chaque bord de pièce, à l'intérieur de la région de mesure (8) avec résolution spatiale ; E) à déterminer au moins un paramètre d'une géométrie de pièce et/ou d'une position de pièce à l'intérieur de la région de mesure (8) en fonction des points de bord détectés. L'invention se rapporte également à un dispositif de mesure (9) permettant de mesurer une pièce en forme de plaque (2).
PCT/EP2022/083312 2021-11-25 2022-11-25 Procédé et dispositif de mesure d'une pièce en forme de plaque WO2023094609A1 (fr)

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DE102021130857.7A DE102021130857A1 (de) 2021-11-25 2021-11-25 Verfahren und Vorrichtung zur Vermessung eines plattenförmigen Werkstückes

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Citations (3)

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JPS5858405A (ja) * 1981-09-30 1983-04-07 Matsushita Electric Ind Co Ltd 板体の測定装置
JPH0552526A (ja) * 1991-08-29 1993-03-02 Nkk Corp シート寸法測定装置
US5214490A (en) * 1990-04-26 1993-05-25 Reliance Electric Ltd. Sheet dimension measurement system

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Publication number Priority date Publication date Assignee Title
JPS58173409A (ja) 1982-04-06 1983-10-12 Toyo Tire & Rubber Co Ltd 帯状体の測長装置
JPH06147836A (ja) 1992-11-13 1994-05-27 Nkk Corp シート寸法測定装置
JP3312564B2 (ja) 1996-09-06 2002-08-12 住友金属工業株式会社 長尺物体の測長装置
JP2004325254A (ja) 2003-04-24 2004-11-18 Gunze Ltd 段差位置検出装置および全幅・段差位置検出装置
EP2908100B1 (fr) 2014-02-18 2018-01-17 Hexagon Technology Center GmbH Système de détermination de positions relatives

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5858405A (ja) * 1981-09-30 1983-04-07 Matsushita Electric Ind Co Ltd 板体の測定装置
US5214490A (en) * 1990-04-26 1993-05-25 Reliance Electric Ltd. Sheet dimension measurement system
JPH0552526A (ja) * 1991-08-29 1993-03-02 Nkk Corp シート寸法測定装置

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