DE202015104751U1 - Device for inspecting products arranged on a material web - Google Patents

Abstract

Inspection device (1) for inspecting products (5) arranged on a material web (2) guided by a guiding device (3), the material web (2) having a front side on which the products (5) can be arranged and one opposite the front side arranged rear side, comprising - a camera (7) with a focus area (8), - a first illumination device (9), - a second illumination device (10), and - a triggering device (11) for triggering an image pickup function of the camera (7) , an illumination function of the first illumination device (9) and an illumination function of the second illumination device (10), wherein - the triggering device (11) is arranged such that in an arrangement of the camera (7) to the material web (2) that the Material web (2) in the focus area (8) can be guided and the front side of the material web (2) in the focus area (8) of the camera (7) faces, - first illumination device (9) such that in the focus region (8) the front side can be illuminated by the first illumination device (9), and - the second illumination device (10) such that in the focal region (8) the rear side is illuminated by the second illumination device ( 10) can be illuminated, the image recording function of the camera (7), the illumination function of the first illumination device (9) and the illumination function of the second illumination device (10) can be triggered such that when the image acquisition function of the camera (7) is triggered, the focus region (8) by at least one active illumination device from the group of the first illumination device (9) and the second illumination device (10) can be illuminated.

Description

The invention relates to a device for inspecting products arranged on a material web guided by a guide device, in particular printed products arranged on a material web, for example labels in a production process.

In the production of products arranged on webs, in particular of printed products such as labels, automated quality assurance is of great importance. Only at an automated quality assurance is web speed of the material web of, for example, up to 500 m per minute a rapid intervention in the production process to avoid high costs of incorrectness, especially due to waste, possible. The basis for this is an automated measurement and evaluation of all relevant factors that influence the quality. In addition to the automated monitoring and support of a visual monitoring by an operator is useful or necessary.

The object of the invention is to provide an inspection device for inspecting products arranged on material webs, which is inexpensive to produce and easy to use in the production process, and which enables effective error detection.

This object is achieved by an inspection device according to the independent protection claim. Further developments can be found in the dependent claims.

An inspection device for inspecting products arranged on a material web guided by a guide device, wherein the material web has a front side on which the products can be arranged, and a rear side opposite the front side, has a camera with a focus area, a first illumination device, a second Lighting device and a triggering device for triggering an image pickup function of the camera, an illumination function of the first illumination device and a lighting function of the second illumination device. The triggering device is set up such that in the case of an arrangement of the camera on the material web such that the material web can be guided in the focal region and the front side of the material web faces in the focal region of the camera, the first illumination device is such that the front side passes through in the focal region the first illumination device can be illuminated, and the second illumination device such that the rear side can be illuminated by the second illumination device in the focal region, the image acquisition functions of the camera, the illumination function of the first illumination device and the illumination function of the second illumination device can be triggered in such a way that upon triggering Image recording function of the camera, the focus area can be illuminated by at least one active illumination device from the group of the first illumination device and the second illumination device.

The triggering device is preferably set up by the first illumination device and the second illumination device to illuminate the focus area alternately and / or simultaneously.

The illumination by means of the illumination devices is preferably a homogeneous illumination of the complete focus area. The illumination by means of the first illumination device is preferably a direct illumination or a diffuse illumination. The illumination by means of the second illumination device is preferably a direct illumination or a diffuse illumination. The illumination by means of the first illumination device is preferably a linearly polarized illumination. The illumination by means of the second illumination device is preferably a linearly polarized illumination.

The illumination by means of the first illumination device is preferably a focused illumination and / or a collimated illumination. The illumination by means of the second illumination device is preferably a focused illumination and / or a collimated illumination and / or a transmissive illumination. The illumination by means of the first illumination device is preferably a bright field illumination and / or a dark field illumination. The illumination by means of the second illumination device is preferably a bright field illumination and / or a dark field illumination.

The first illumination device is preferably set up to emit in the ultraviolet, in the visible and / or in the infrared wavelength range. The second illumination device is preferably set up to emit in the ultraviolet, in the visible and / or in the infrared wavelength range.

The first illumination device is preferably configured to emit monochrome radiation, polychromatic radiation and / or an adjustable spectrum, in particular adjustable by means of RGB illumination. The second illumination device is preferably configured to emit monochrome radiation, polychrome radiation and / or an adjustable spectrum, in particular adjustable by means of RGB illumination.

The first illumination device preferably comprises incandescent lamps, gas discharge lamps, LEDs, in particular OLEDs and / or AMOLEDs, and / or lasers. The second illumination device preferably comprises incandescent lamps, gas discharge lamps, LEDs, in particular OLEDs and / or AMOLEDs, and / or lasers.

The first illumination device is preferably set up to perform a row illumination or a surface illumination. The second illumination device is preferably set up to perform a row illumination or a surface illumination. The first illumination device is preferably modular and / or adaptable to the width of the material web. The second illumination device is preferably modular and / or adaptable to the width of the material web. The first illumination device is preferably stationary relative to the material web or displaceable in the direction of the material web width. The second illumination device is preferably fixed relative to the material web or displaceable in the direction of the material web width.

The first illumination device is preferably designed to emit continuous light and / or flashed light. The second illumination device is preferably designed to emit continuous light and / or flashed light. It is particularly preferred for the first illumination device to emit flashed light and the second illumination device to emit continuous light.

The first illumination device and / or the second illumination device is preferably arranged such that an illumination angle with which the radiation strikes the material web is selected as a function of the material of the material web.

The camera is preferably a line camera or a camera with a two-dimensional matrix of photoelements. The camera is preferably a multi-channel camera with multiple channels for different wavelength ranges. The camera is preferably a black and white camera or a color camera. The camera is preferably set up to use a region of interest. The camera is preferably a CCD camera or a CMOS camera. The inspection device preferably has a plurality of cameras whose focus areas are arranged overlapping or adjoining one another. The inspection device preferably has an additional detail camera, which is set up to take a section of the focus area with a higher spatial resolution. The camera is preferably set up to record one-dimensional, two-dimensional or three-dimensional images. The camera preferably has a zoom lens or fixed focus lens. The camera is preferably fixed relative to the material web or displaceable in the direction of the material web width.

During commissioning of the inspection device, the camera can be aligned such that the side edges and / or the position guidance of the material web in the images captured by the camera are parallel, whereby the camera is oriented such that its optical axis is arranged at right angles to the material web.

The inspection device is preferably set up to carry out a plurality of inspection types, for example a print image inspection, a label inspection, a web observation, a measurement of UV security features, a color density measurement and / or a spectral color measurement. To perform a plurality of the aforementioned methods, a plurality of monitors and / or a plurality of types of lighting may be provided. For example, two, three, four, five or more than five types of inspection may be performed with a single inspection device.

The material web is preferably transparent, translucent or opaque mixed.

The inspection device can in particular be an inspection device for quality inspection and assurance in a production process of, for example, printed products such as printed labels, which are provided on the material web, for example. B. may be adhesively arranged or glued.

The material web may comprise a carrier material, such as a film, wherein the products are arranged on the film. The carrier material may comprise a material on which the products or labels may be reversibly or peelably glued or glued. In particular, the carrier material may have a smooth surface with which the adhesive surfaces of the labels do not permanently bond. Furthermore, the material web can have a substantially uniform translucency or transparency, so that when the backside is illuminated, the light at the front side of the material web substantially uniformly shines through. Alternatively, the carrier material may also be a conveyor belt which is present for example in the form of a closed ring.

The material web can be introduced as a quasi endless web into the guide device and can be guided by it at a predetermined speed. Here, the products or labels arranged on the material web are guided along a production line, wherein they contact various stages of production, such as printing and quality control.

The guide device may include different guide components such as reel spools, side guides, roller guides, and the like, which components are intended to provide secure guidance of the web at a substantially uniform speed along the production line. On the front side of the material web, the products can be arranged and transported on the material web through the production line.

The products may be printed matter such as print labels consisting of a z. B. also quasi endless label raw material, for example, were punched out, whereby the print labels are separated from the surrounding transport webs or matrix residues. The matrix formed by the webs of label material lying between the individual labels can already be removed, that is to say be pulled off the material web.

The products or labels thus arranged on the material web can be guided by the guiding device along the production line to a printing device to which any predefined color application is applied to the products by any printing process such as offset printing. For example, in the printing device, an application of at least one color, a pattern, a font, an image, a numerical value, a barcode or the like can take place.

Such a production or printing process of the products can be error-prone. In particular, it is possible that the products are not arranged correctly on the material web or products are missing because they z. B. when removing the matrix were removed with. Furthermore, residues of the matrix may remain between the products. In addition, an imprint on at least one of the products may not meet the specifications and, for example, color splashes, smearing, displacements or other errors included.

In order to enable detection of quality defects, the inspection device can be arranged, for example, in the web running direction downwards from the printing device. If the camera is arranged vis-à-vis the material web such that the material web is guided through a viewing area of the camera and in particular the focus area located in the viewing area and the camera is focused on the front side of the material web, then it can be illuminated by the camera first illumination device to generate digital images of the front. With suitable illumination from the rear side by the second illumination device, the camera can produce digital transmitted light images of the light penetrating the material web and causing a shadow. The field of view of the camera is to be understood as meaning the region from which light can be directed into an aperture of the camera, as the focal region the partial region of the viewing region from which a sharp image can be generated in the aperture of the camera.

The lighting and image recording functions can be controlled by the triggering device. In particular, it can be effected that, when the image recording function of the camera is triggered, the focus area is illuminated by exactly one active illumination device. In particular, either an illumination of the material web by the first illumination device from the front to take place on the material web products take place, so that an image recording in particular the imprint on the products is obtained (hereinafter referred to as recording in reflected light mode). Alternatively, the material web can be illuminated by the second illumination device from the rear side. In this case, the light can penetrate through the translucent, transparent or opaque mixed material web, so that the exposure sensors arranged in the receiving area of the camera are exposed with a shadow image of the products arranged on the material web (referred to below as recording in the transmitted-light mode). However, it is also conceivable that the material web is illuminated simultaneously by the first illumination device and by the second illumination device.

If, for example, a fast-release camera with, for example, approximately 300 images per second is used as the camera, two image sequences covering the entire material web can be recorded with a focus range of approximately 50 mm in the web direction of the web and a web speed of approximately 450 m / min where each location of the web is imaged at least once in the reflected-light mode and once in the transmitted-light mode. With proper organization of the pixels picked up by the camera in a storage area of the inspection device or a computer communicating with the inspection device, a continuous image of the front side (ie an image representing 100% of the material web) of the material web in reflected light mode and a continuous image (ie an image representing 100% of the material web) of the web in transmitted light mode. The comprehensive digital images enable comprehensive quality control and documentation.

The alternative exposure in the reflected and transmitted light mode allows a variety of evaluations with the purpose of effective quality control. In particular, with only one camera it is possible to detect the printed images applied to the products on the one hand and the shadow images caused by the arrangement of the products on the material web on the other hand. As a result, on the one hand errors in the printing, for example by comparing the recorded image with a reference image, can be detected. On the other hand arrangement problems or errors on the material web can be recognized, in particular if matrix residues and protrusions between the products have remained on the material web or if products or labels are missing. Combined evaluations are also possible because the arrangement of the products can be used on the web to z. B. to recognize an arrangement of the printed image on the products and, for example, make a print image shift on the labels detectable.

These evaluations can be achieved inexpensively, in particular with only a single camera and a simple, space-saving arrangement on the production line. The inspection device therefore combines the advantages of effective fault detection with a cost-effective and space-saving device design.

It may also be sufficient to carry out the illumination only with the first illumination device and then carry out these evaluations on the basis of the images illuminated only with the first illumination device.

In one embodiment, the triggering device is configured to trigger the image pickup function of the camera in an alternating change in each case when illuminating the focus area by the first illumination device and when illuminating the focus area by the second illumination device.

In this embodiment, when the material web is simply passed through the focus area, an image sequence can be achieved with alternating illumination once in the reflected-light mode and once in the transmitted-light mode. In this way, the first image sequence in the reflected-light mode, which can cover the entire front side of the material web, can be created simultaneously with the second image sequence in the transmitted-light mode, which can illuminate the entire region of the material web, and this with only one camera.

In one embodiment, the triggering device is set up to determine an illumination time of the first illumination device and / or a triggering time of the camera depending on an evaluation result of an image captured by the camera during illumination by the second illumination device.

In this embodiment, the digital transmitted light images can be used to determine an x-y position and a speed of the material web, in particular a y-position of the products arranged on the material web, and on this basis to determine an optimum moment for the image pickup of the front side. In this case, y denotes the running direction of the material web and x is oriented in the direction of the width of the material web.

The speed of the material web can be determined on the basis of the brightness gradients in the transmitted light images. In particular, it can be concluded from the brightness gradients on the y-position of a product at the time of each transmitted light recording. From the local displacement of the product and the time interval between the respective transmitted light shots can then be concluded that the speed of the product or the material web. Alternatively, the speed of the material web, for example, from the guide device, a gear sensor and / or an encoder via an interface to the inspection device can be reported.

On the basis of the speed of the material web and the y-position of the products arranged on the material web, the illumination time of the first illumination device for illuminating the front side and / or the triggering time point of the camera can be determined.

As a result, z. B. be achieved that during a recording always exactly one line or repetition sequence of printed products or labels is recorded in a digital image recording the front. This simplifies a comparison of the printed image applied to the products, for example with a reference image or a "golden template". When a defect is detected, the coordinates of the defect on the material web can be determined, for example, simply on the basis of the transmitted light. Information about quality defects can be stored with an indexing representing the coordinates of the web, which makes it unnecessary to store the entirety of the images of the front side and leads to an efficient use of memory.

Furthermore, the triggering of the lighting function of the first lighting device and the image pickup function of the camera can be easily done in the triggering device are made without an external information about a speed of the material web must be present. As a result, the inspection device may be modular and designed essentially independently of the guide device, the gearwheel sensor and / or the encoder, interfaces can be reduced to a minimum and compatibility problems are avoided.

In a further embodiment, a shooting mode of the camera may be determinable when triggered depending on the active illumination device, and / or a capture mode of the camera when triggered by a lighting device by the second illumination device may have a limited color spectrum, be monochrome, and / or be lesser Have image resolution.

In particular, to check a printed image on a product, a high image resolution, in particular a high number of pixels, each with sufficient color depth, may be necessary to detect deviations from the reference image with the required accuracy. At the same time can be dispensed with a detailed image resolution or color depth in the localization of the products on the web in the transmitted light, since it depends only on the presence and the arrangement of products or matrix residues. The transmitted light images in the transmitted light mode can therefore be recorded by the camera in a recording mode which enables efficient storage and effectively utilizes an available memory space, that is, the recording mode. H. with reduced pixel count, reduced color depth or monochrome image acquisition. The data packet sent by the camera also has a smaller scope.

In one embodiment, the triggering device is configured to adapt an arrangement of the camera relative to the material web and / or a width and / or an orientation of the focus region of the camera depending on an evaluation result of an image captured by the camera during illumination by the second illumination device.

In this embodiment, the easily and quickly evaluable information of the shadow image in the digital transmitted light image is used to control the camera. So it may be z. B. come in a drift of the web in the x direction relative displacements between the camera and web. Such shifts can be compensated by the inspection device, for example by adjusting the orientation of the camera, a displacement of the camera or an adjustment or alignment of the visual or focus area in the x-direction. For example, by means of a software, a live image of the material web can be generated, which can then be used to make the adjustment or alignment in the x direction. As a result, effective quality assurance can be achieved largely independently of the conditions of the production process.

A further embodiment has a test device, wherein the test device is set up to determine a test result of an image recorded by the camera during illumination by the first illumination device as a function of an evaluation result of an image captured by the camera during illumination by the second illumination device ,

In this embodiment, the easy readability of the transmitted light image is used with the shadow images of the products to z. B. to close an arrangement of the products on the web during image acquisition of the front. Thus, for example, a shift of an image print on a label in a combined evaluation of the transmitted light image in the transmitted light mode with the reflected light image in reflected light mode can be easily detected, whereas a detection of the label edges from the incident light image in reflected light mode and thus detection of the shift alone from the incident light image in reflected light mode problematic can be. Error detection in quality control is further improved.

In one embodiment, the inspection device has a control device, wherein the control device is set up as a function of the test result of the test device, a control signal for the guide device and / or for a on the web with respect to a direction of travel of the web above the camera arranged printing device for printing the Produce products.

By means of the control device, it is possible to generate and transmit signals, for example in a predetermined format, which enable an active intervention in the printing or production process. For example, can be stopped when detecting regularly occurring printing errors that are due to contamination in the printing device, the printing process for printing the products and / or the transport of the web so as to prevent further quality defects and thus incorrect performance costs. Also a passive intervention is possible. For example, a signal may be output to the operator prompting the operator to inspect the printing device and / or a punch.

In a further embodiment, the control device is set up to generate a control signal for the guide device for changing an arrangement of the material web in the guide device as a function of an evaluation result of an image recorded by the camera.

In this embodiment, it is possible to use the results of the evaluation of the inspection device, for example an evaluation of the transmitted light images, also for a control of the guide device of the material web. For example, it can be concluded from a shift of the shadow of the products in the transmitted light recording on a shift of the material web. This information can be used for a drift correction or position correction of the material web in the x-direction and / or in the y-direction. Consequently, the evaluation results of the inspection apparatus can be used not only for quality control but also for control and control of the production process.

In a further embodiment, the control device is configured to generate in a learning mode control signals for the printing device and / or the guide device as a function of an evaluation result of an image captured by the camera.

In particular, in this embodiment, a learning mode, for example, after a production change of the products to be printed by the inspection device itself can be controlled. As a result, on the one hand effective quality control is achieved, on the other hand improves the interaction between inspection device and production line. In particular, in the learning mode, the inspection device can load a predetermined reference image, start and stop a startup of the material web as required, determine a speed of the material web on the basis of the transmitted light images and train a printing error detection.

In a further embodiment, the triggering device is set up to determine a speed of the material web as a function of an evaluation result of two images recorded by the camera during a respective illumination by the second illumination device, and / or adapted to a speed depending on the speed of the material web Trigger time of the first illumination device, a triggering time of the second illumination device, a triggering time of the camera, a triggering time interval of the first illumination device, a triggering time interval of the second illumination device and / or a triggering time interval of the camera to determine.

The speed of the material web can be determined based on the brightness gradient in the transmitted light images and results z. B. from the y-position of a product at the time of each transmitted light, in particular from the local displacement of the product and from the time interval between the respective transmitted light shots. Alternatively, the speed of the material web, for example, from the guide device, the gear sensor and / or the encoder can be reported via an interface to the inspection device.

On the basis of the speed of the material web, the respective triggering times or triggering intervals of the lighting devices and the camera can be determined such that a first subsequence of images of the material web is generated when illuminated by the first illumination device, in which each point of the material web is imaged in exactly one shot is. Furthermore, a second partial sequence of images of the material web can be generated when illuminated by the second illumination device, in which each point of the material web is also imaged in exactly one shot. This results in a complete virtual image of the material web on the one hand in reflected light and on the other hand in transmitted light mode.

These and other features are explained in more detail below with reference to examples in the description of the figures. It shows

1 the arrangement of a device for inspecting products arranged on a material web in a side view,

2 a triggering behavior of the inspection device 1 .

3 an arrangement of exposure areas on a material web,

4 another triggering behavior of the inspection device 1 ,

1 shows schematically in a side view an arrangement of an inspection device 1 on a material web 2 passing through a guiding device 3 through a production line with a printing device 4 to be led. On a front side of the material web 2 are labels 5 arranged by the printing device 4 For example, be printed in color.

In a transport direction 6 behind the printing device 4 is the inspection device 1 arranged, which is a camera 7 with a viewing area 21 and one in the field of vision 21 focusing area that can be focused with a predetermined focus 8th having. The camera 7 is doing so on the web 2 arranged that the material web 2 in the focus area 8th the camera 7 is feasible and the front of the web 2 in the focus area 8th the camera 7 is facing. Furthermore, the inspection device 1 a first lighting device 9 and a second lighting device 10 on. The first lighting device 9 is also on the front so on the web 2 arranged that in the focus area 8th the camera 7 the front of the web 2 through the first illumination device 9 is illuminated. The first lighting device 9 is thus suitable for generating a through the camera 7 Recordable Auflichtbilds the top of the web 2 , The second lighting device 10 however, is arranged such that in the focus area 8th the camera 7 the back of the web 2 through the second illumination device 10 is illuminated. The second lighting device 10 is thus suitable for illumination for generating a transmitted light image of the material web.

The inspection device 1 also has a triggering device 11 on, through which an image capture function of the camera 7 and a respective illumination function of the first and second illumination device 9 . 10 are triggerable. In particular, the triggering device 11 configured such that when triggering the image recording function of the camera 7 the focus area 8th by exactly one active lighting device of the lighting devices 9 . 10 is lit. Thus, either a reflected light or a transmitted light image of the material web is generated.

Furthermore, the inspection device 1 a testing device 12 on, which is set up, depending on an evaluation result by the camera 7 recorded light image to produce a test result of a captured by the camera image of the incident light. In particular, from the transmitted light images, for example, information about an arrangement of the labels 5 on the material web 2 which make it possible to print the image on the labels 5 and in particular its arrangement on the labels 5 to consider.

Furthermore, the inspection device 1 a control device 13 , which is set up, depending on a test result of the test device 12 a control signal for outside the inspection device 1 Expend existing components such as the production line, such as the guide device 3 and the printing device 4 , The control device 13 thus creates an interface to the production line, which is the inspection device 1 based on the test results of the test facility 12 also intervene directly in the production process, be it for stopping the production process or by a correction, for example, a drift shift or positional shift of the web 2 in the x-direction and / or y-direction. Like it out 3 it can be seen, the y-direction is in the direction of the web 2 oriented and the x-direction is perpendicular thereto in the direction of the width of the material web 2 oriented. The interface provided by the control device also makes it possible, for example in a learning mode to a new production unit, to start up the material web 2 , a stopping of the material web 2 and / or a printing by the printing device 4 to control.

In 2 is a tripping behavior of the tripping device 11 shown, and in particular a time course of triggering 14 the first illumination device 9 , a trigger 15 the second illumination device 10 and a trigger 16 the picture-taking function of the camera 7 , When triggered 16 the picture-taking function of the camera 7 is the focus area 8th always lit by exactly one active lighting device. Furthermore, the focus area becomes 8th when triggering the image capture function of the camera 7 alternatively alternately through the first and second illumination device 9 . 10 illuminated.

In 4 is another triggering behavior of the tripping device 11 shown, and in particular a time course of triggering 14 the first illumination device 9 , a trigger 15a the second illumination device 10 and a trigger 16 the picture-taking function of the camera 7 , The time course of the triggering 14 is characterized by a flashing illumination, the timing of the triggering 15a is characterized by a constant lighting.

With the in 2 and 4 For example, the tripping behavior shown in FIG 3 shown imaging sequences 17 and 18 generated by a track section 19 through the camera 7 each with illumination by the first and second illumination device 9 . 10 to be obtained. In particular, the first imaging sequence 17 composed of several consecutive, the track section 19 overlapping transmitted light shots while at the second imaging sequence 18 to Auflichtaufnahmen the tape section 19 is. The shift of the respective single shots 20 results from the further transport of the material web 2 while taking pictures.

An evaluation of the first imaging sequence 17 allows easy recognition of the arrangement of the labels 5 on the track section 19 which eliminates missing labels as well as on the track sections 19 Remaining matrix residues can be easily recognized. Furthermore, based on the position detection of the labels 5 the lighting and tripping behavior of the inspection device 1 be controlled and adapted to the arrangement of the labels that a simple evaluation is possible.

The evaluation of the second imaging sequence 18 can be based on from the first imaging sequence 17 obtained position information regarding the labels 5 be made. This allows the focus area 8th the camera 7 be properly located, misprints can be easily detected and displacements of the imprint on the labels 5 as in the second imaging sequence 18 shown, can be easily recognized.

LIST OF REFERENCE NUMBERS

1

inspection device

2

web

3

guiding device

4

imprinter

5

produce

6

transport direction

7

camera

8th

focus area

9

first lighting device

10

second illumination device

11

triggering device

12

test equipment

13

control device

14

Triggering the first illumination device

15

Triggering the second illumination device

16

Trigger the image capture function

17

first picture sequence

18

second picture sequence

19

web section

20

Single shot

21

viewing area

Claims (12)

Inspection device ( 1 ) for inspection by a guiding device ( 3 ) guided material web ( 2 ) ( 5 ), wherein the material web ( 2 ) a front on which the products ( 5 ) are arranged, and having a front side opposite arranged rear, with - a camera ( 7 ) with a focus area ( 8th ), - a first illumination device ( 9 ), - a second illumination device ( 10 ), and - a triggering device ( 11 ) for triggering an image pickup function of the camera ( 7 ), an illumination function of the first illumination device ( 9 ) and an illumination function of the second illumination device ( 10 ), wherein - the triggering device ( 11 ) is arranged so that in an arrangement - the camera ( 7 ) to the material web ( 2 ), that the material web ( 2 ) in the focus area ( 8th ) is feasible and the front of the web ( 2 ) in the focus area ( 8th ) the camera ( 7 ), - the first illumination device ( 9 ) such that in the focus area ( 8th ) the front through the first illumination device ( 9 ), and - the second illumination device ( 10 ) such that in the focus area ( 8th ) the back through the second illumination device ( 10 ), the picture-taking function of the camera ( 7 ), the illumination function of the first illumination device ( 9 ) and the illumination function of the second illumination device ( 10 ) are triggered in such a way that when triggering the image recording function of the camera ( 7 ) the focus area ( 8th ) by at least one active illumination device from the group of the first illumination device ( 9 ) and the second illumination device ( 10 ) is illuminated. Inspection device ( 1 ) according to claim 1, wherein - the triggering device ( 11 ) in such a way to the speed of the material web ( 2 ) is adapted such that an image pickup function of each section of the web ( 2 ) in an active illumination device of the first illumination device ( 9 ) and the second illumination device ( 10 ) is illuminated. Inspection device ( 1 ) according to claim 1 or 2, wherein - the inspection device ( 1 ) has at least three different illumination devices that are set up, the focus area ( 8th ) and the triggering device ( 11 ) is set up the image capture function of the camera ( 7 ) at each of the lights. Inspection device ( 1 ) according to any one of the preceding claims, wherein - the triggering device ( 11 ) is set up to use the image capture function of the camera ( 7 ) in an alternating change in each case when the focus area is illuminated ( 8th ) by the first illumination device ( 9 ) and when illuminating the focus area ( 8th ) by the second illumination device ( 10 ). Inspection device ( 1 ) according to one of the preceding claims, wherein - the triggering device ( 11 ) is set up, depending on an evaluation result of one of the camera ( 7 ) during illumination by the second illumination device ( 10 ) an illumination time of the first illumination device ( 9 ) and / or a triggering time of the camera ( 7 ). Inspection device ( 1 ) according to one of the preceding claims, wherein - a recording mode of the camera ( 7 ) is determinable when triggered as a function of the active illumination device, and / or - a recording mode of the camera ( 7 ) when triggered by a lighting device by the second illumination device ( 10 ) has a limited color spectrum, is monochrome and / or has a lower image resolution. Inspection device ( 1 ) according to one of the preceding claims, wherein - the triggering device ( 11 ) is set up in dependence on an evaluation result of one of the camera during illumination by the second illumination device ( 10 ) is an arrangement of the camera ( 7 ) relative to the material web ( 2 ) and / or a width and / or orientation of the focus area ( 8th ) the camera ( 7 ). Inspection device ( 1 ) according to one of the preceding claims, with a test device ( 12 ), the test device ( 12 ) is set up, depending on an evaluation result of one of the camera ( 7 ) during illumination by the second illumination device ( 10 ) a test result from the camera ( 7 ) during illumination by the first illumination device ( 9 ). Inspection device ( 1 ) according to claim 8 with a control device ( 13 ), wherein - the control device ( 13 ) is set up, depending on the test result of the test equipment ( 12 ) a control signal for the guide device and / or for one on the material web ( 2 ) with respect to a running direction of the material web ( 2 ) in front of the camera arranged printing device ( 4 ) for printing on the products ( 5 ) to create. Inspection device ( 1 ) according to claim 9, wherein - the control device ( 13 ) is set up, depending on an evaluation result of one of the camera ( 7 ) received a control signal for the guiding device ( 3 ) for changing a position of the material web ( 2 ) in the x-direction and / or in the y-direction in the guide device ( 3 ) to create. Inspection device ( 1 ) according to claim 9 or 10, wherein - the control device ( 13 ) is set up in a learning mode control signals for the printing device ( 4 ) and / or the guiding device ( 3 ) depending on an evaluation result of one of the camera ( 7 ). Inspection device ( 1 ) according to one of the preceding claims, wherein - the triggering device ( 11 ) is set up, depending on an evaluation result of two of the camera ( 7 ) during a respective illumination by the second illumination device ( 10 ) recorded images to determine a speed of the web, and / or - the trip unit ( 11 ) is set up, depending on the speed of the material web, a triggering time of the first lighting device ( 9 ), a triggering time of the second illumination device ( 10 ), a triggering time of the camera ( 7 ), a tripping time interval of the first lighting device ( 9 ), a tripping time interval of the second illumination device ( 10 ) and / or a triggering time interval of the camera ( 7 ).

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