Sensor device

FIELD: physics.

SUBSTANCE: invention refers to fluorescing or phosphorescing print check and detection on sheets fed to printing press for securities printing. Luminescent sensor device contains set of subunits, optical sensitive elements, at that each subunit contains ultra-violet lighters for sample illumination, digital camera system containing front element, mirror assembly tracking light radiated from the specified sample to front element of digital camera system; and digital signal processor providing processing of signals, generated by the specified front element of digital camera system. Thus fluorescing or phosphorescing print check and detection system on security sheets contains luminescent sensor device.

EFFECT: improved control quality.

10 cl, 6 dwg

 

The present invention relates to fluorescent sensor device and the control system to detect and print checks fluorescent or phosphorescent paint on the sheets fed to the printing machine for printing securities.

Typically, systems printing machines are exposed to different vibrations, which leads to the occurrence of defects caused by changing the rheology of paints, disruption of the balance of ink and water, temperature, etc. These changes and defects lead to continuous changes color when printing the printed product.

The quality control system color for the control deviations in color at startup and on phases of long-term printing is known from the prior art. For example, in patent US 6024018 described control system color to maintain constant color on the printed page in the printing process within the spatial system of color perception by the person, which includes an elongated fluorescent lamp, uniformly illuminating a strip of printed products, CCD camera, perceiving the actual image of the printed sheet, the data processing unit to analyze the actual colors printed sheet measurement deviations relative to the reference values and the management of the screw of adjustment of ink in the printing machine.

When sorting using the x notes and other securities are increasingly being used invisible signs, in particular fluorescent and phosphorescent signs, to distinguish different labels and to identify fakes.

Therefore, it is recommended to inspect the printed products invisible fluorescent inks, i.e. fluorescent or phosphorescent dyes that absorb ultraviolet color and emitting visible color used in the printing machine as for print quality control, and to control the intensity of the signal.

Therefore, one aspect of the invention is the provision of a control system of a luminescent colors, made with the possibility of detection and control of printed sheets of securities executed in real-time with the speed up to the maximum and above the maximum operating speed of the printing machine.

Another aspect of the invention is the provision of a control system having the same functions in respect of printed products, made with the use of visible colors, emitting infrared rays in the light spectrum. Another aim of the invention is to provide a control system of printed products made iridium colors.

An additional aspect of the invention is the provision of a fluorescent sensor device, made with the possibility of transmission and control of printed sheets in real time and ababab the TCI data transfer fluorescent images of leaves in the host computer.

This monitoring system should be developed for the user so that he could quickly identify defects in the printed product and could take measures to remedy the situation with insufficient or excessive paint.

These objectives are achieved by using the sensor device, which includes multiple sub-blocks of optical sensing elements; each of the above sub-block contains

means of illumination, in particular, the means of ultraviolet illumination, is able to cause the illumination of the selected portion of the sample;

- means a digital camera that contains the front part;

- funds mirror that collects and guides the light emitted from the area specified sample in front of the camera; and

- digital signal processor (DSP)that processes the signals generated by the above-mentioned front of the camera.

In accordance with the invention using fluorescent-touch device in the mode group sources of UV illumination causes fluorescent and phosphorescent glow of the invisible particles of printed colors, including fluorescent glow. The corresponding group of cameras, and digital signal processors detects and handles this fluorescent radiation and transmits the data to the host computer. Software programs is giving this computer allows you to combine the collected and processed data, obtained from different sub-blocks, with the issuance of a single image of the monitored list on the control screen.

Preferably the sub-blocks in a row with a length sufficient for the perception and control sheets having a maximum width at their submission to the printing machine. Preferably the group of sub-blocks in a common sealed housing. Because the case is sealed, sensitive inner part of the sensor device is protected from dust, lubricants and all solvents, which are generally present inside the printing machine. In the housing can be provided with transparent Windows for ultraviolet radiation, placed at least along the line of radiation of ultraviolet rays emitted by means of ultraviolet radiation.

The structure of applied digital cameras are CMOS-camera. The signal of each subblock camera, is processed by the digital signal processor. The digital signal processor associated with the device (interface); part of the above interface is bus wiring, fire alarm system, connecting all the digital signal processors with an external computer.

The luminescent glow emitted by the sample, can be of low intensity, so the mirrors of each optical sub-block sensitivity is s elements predominantly contain parabolic mirror to collect light, emitted by the controlled sample. This light is focused and transmitted to the oppositely located a mirror, which, in turn, reflects the light of the above and directs it through the lens front of the camera in the photosensitive element of the camera.

The present invention proposes to improve the printing machine for submission of securities, in particular, to improve the control system for the discovery and validation of colors printed products, in particular, fluorescent inks printed products, the above control system includes a sensor device as described above, associated with a computer connected to the above-mentioned device via the interface, thus allowing a comparison of the obtained image of each printed sheet with predetermined values entered in the program, in particular, with the specified image of one or more of the above sheets.

In addition, the control system may include pulse position sensor for identification sheets and identify possible typos and presence sensor sheet to start monitoring and verification.

For perception and test sheets, on which is applied a fluorescent and phosphorescent paint with weak fluorescent radiation, the control system may include additional means is ultrafioletoviy backlight. This unit additional lighting may consist of a set of ultraviolet tubes directed to the zone under subsection sensitive elements.

Preferably the number of subblocks of sensing elements installed in the housing of the sensor device, so that the above number is parallel with the printed sheets and was rotated in the transverse direction to the direction of movement of the above sheets.

The measurement accuracy and the image quality of the sheet can also be increased by setting the suction plate parallel to the row of subblocks sensitive elements, under the printed sheet, which, thus, will allow you to set a constant distance to measure.

The sensor device and the suction plate are attached facing each other and placed in any lower position applying fluorescent dye, for example, within the feed section of the printing machine, in particular, immediately before the first selection stack. This will allow you to send in a separate pile control sheets with printing defects with the use of the interface between the control system and a printing machine.

Other characteristics and advantages of the present invention will be apparent to a person skilled in this technical field description preference is sustained fashion choices implementation in connection with the accompanying drawings, in which:

- Figure 1 is a side view of a printing machine equipped with a control system in accordance with the invention, showing a possible position of the body sensor unit and the suction plate;

- Figure 2 is a photograph of the body sensor unit and the suction plate mounted on the printing machine;

- Figure 3 is a perspective view of a fluorescent sensor device in accordance with the invention with removed top cover of the case;

- Figure 4 is a side view of the sub-block with an illustration of the functions of the components in its composition;

- Figure 5 represents a schematic view of a cross-section along the axis AA' Figure 4 fluorescent sensor devices;

- 6 shows an example of the working window and the working window of the monitor control panel.

Figure 1 shows that the sheet is fed to the printing machine; a control system according to the invention is placed at the printing section within section feed print sheets, immediately before the first selection stack. 1 schematically shows the position of the housing 1 touch device on node feed printed sheets and the position of the suction plate 20, face in the side of the hull 1-touch device that is installed directly under the section of the sheet feeder, therefore, the error is through a constant distance between the surface of the controlled sheet and luminescent touch devices.

Figure 2 presents a photograph of the location housing the sensor device and the suction plate on the industrial printing machine, sheet rotary machine high digital printing type SuperNumerota 212 (TM) manufactured by KBA-GIORI. In accordance with Figure 2 the length of the fluorescent sensor device is controlled so as to extend over the entire width of the section of the sheet feeder. Full length housing-touch device is slightly higher than 800 mm, the Number of sub-blocks of the optical sensing elements in this case is five sub-blocks and is chosen in such a way as to cover the whole of controlled length, which is approximately 800 mm, with a slight overlapping of the fields that are controlled by respective sub-blocks, the field covered by each subblock camera/digital signal processor, width slightly exceeds 160 mm

The suction plate is shown in figure 2, consists of a perforated sheet metal plate, a group of fans, suction passing the sheet down to the plate, providing a constant distance between the sheet and the touch device.

Figure 3 is a view in perspective of the housing 1 touch the device with the cover removed for ease of explanation. Each subsection 2 of the sensing element contains the means of the 3 lights. The means of illumination are selected from the respective monochromatic light sources or light sources with a wide range, such as LEDs, ultraviolet radiation, which, for example, emit light with a wavelength of 375 nm, the white LEDs, the LEDs infrared radiation, mercury lamps, ultraviolet radiation, deuterium lamp ultraviolet radiation, etc. given absorption band excitation controlled paints. The ray of light of illumination is focused on the sheet in such a manner as to cover the area of the sheet is controlled by the corresponding sub-block. Thus, the intensity and control of the measured signals is amplified in comparison with the use of elongated tubes, designed to illuminate the entire width of the sheet.

As shown in Figure 4 and Figure 5, each sub-block 2 also contains a parabolic mirror 4 and located in front of the mirror 5, directed to the front part 6 of the camera. Figure 4 schematically shows the path that passes the light from the led 3 to the moving sheet 7, emitting fluorescent or phosphorescent light onto a parabolic mirror 4, which focuses passed the light on the mirror 5, located opposite, which, in turn, reflects the light of the above in front of the camera. Light is received optical. inym element of each camera through the lens diameter 6 mm

Light emitted by the led 3, passes through the first transparent window 10 to ultraviolet radiation and falls onto the sheet, and re-radiated light again enters the housing through the second window 11. If the second window 11 is not transparent window for ultraviolet radiation will pass through it in only the visible light, which includes light re-emitted through fluorescence/phosphorescence, while the reflected UV light will be absorbed.

As shown in Figure 3, each sub-block 2 contains the node 8 CMOS camera and the host digital signal processor. You can read any given line group using a CMOS camera, whereas this is not possible when using the basic CCD camera. This feature allows the user to easily configure multiple cameras to one another without the use of complex mechanical procedures: configuring is accomplished by selecting the corresponding line of sight of each camera so that the image in one camera coincides with the image of the next camera, creating a camera with a line scan. Thus, it is preferable to use a CMOS camera.

Figure 5 shows the group consisting of five sub-blocks that allows you to read the entire width of the sheet 7. The width of each parabolic mirror is approximately 160 mm Range and the five independent cameras, and digital signal processors connected to the host PC via a wired bus signaling for data transmission, and also connected to a separate power source, a means of starting the movement of the sheet and line-by-line pulse device.

The above placement of five blocks allows you to create full continuous line of control across the entire width, which is slightly more than 800 mm sensor device has an optimum distance control, which is 100 mm from the surface of the sheet. However, the device may be easily adapted to work on a different distance.

The position of the individual illumination means associated with each sub-block within the housing of the touch device allows you to create a compact design.

The control system also includes step-by-step the encoder (not shown)installed on the feed drum, moving with a speed of one revolution per sheet. The presence of the sheet is controlled by photoelectric proximity switch. A separate controller that is installed on the remote operator control guarantees a constant resolution vertically, for example 0.5 mm on the basis of the influence of these two components. The controller generates the start signal for each sheet, and the pulse on each line of the sheet, moving towards luminescent touch devices. The pulses are generated only in the presence of a sheet.

The remote control is tion (not shown) performs an interface function with the touch device operator. It consists of a PC, flat screen, keyboard and mouse, allowing you to install and manage a touch device. In addition, the remote control can be mounted warning lights, indicating the actual state of the device, for example, blue color indicates whether the control function or not; green, orange and red light are used as the light signal and indicate the deviation with respect to the permissible restrictions in the printing process. In addition, the remote control may have different bodies and control buttons, with which you can turn off the power to the sensor device, the backlight and encoding controller node. On the remote control is also uninterruptible power source, which performs the function of the buffer unit when the mains power fails. PC that is also located on the control panel can be equipped with a recording device CD-ROM drive for the backup set in the control data. In addition, the control panel houses the power source and the relay to power the lights alarm panel and the above-mentioned controllers.

The user interface of the control system has the following functions:

A. Install touch devices:

Installing a sensor unit should be performed only once on the first run of the device; it remains unchanged throughout the lifetime of a particular sensor device.

b. Installation control function:

To start defining a new installation of control it is necessary to use a reference sheet or sheets, for which information should be recorded on the different studied areas (ROI) by setting their parameters. When installing sheet total width and height of the printed sheet is determined by setting boundaries around areas of printing. The General layout of banknotes or other securities also determined and distributed on the worksheet by entering the number of columns and rows. Precise adjustment of the placement can be carried out manually. Survey area (ROI) can be defined for a particular banknotes/securities and then copied automatically on all other securities in columns and rows.

The software control system provides control of the studied areas. The first algorithm is to assess the cliche type of ROI 22. It calculates the average density defined square survey area and compares this average value with the limit values set by the operator.

The second algorithm detects the barcodes within a particular zone ROI 23 and compares them with the template.

C. Control operating mode:

When the transformation as well software control system clearly displays the actual status of the different studied areas and constantly informs about possible problems, occur in the printing process. The software also registers trends insufficient or excessive supply of paint, allowing the operator to take corrective action prior to the execution of defective printing. The inspection results are displayed on the screen in real time with the issuance of a warning signal and the identification of appropriate control.

In the printing process, if the monitoring function is activated, the output of the touch device, you are the light signal in real time, which goes to the control panel screen in two different ways (see Fig.6).

In the main window 21 provides General information on the sheet. Instant status of the test zones 22 and 23 is shown in colored frames that are updated for each sheet. In the case when everything is in order, the frames are displayed in green, while the average values of the studied areas are located within the established boundaries or bar codes correctly recognized.

As soon as the average value of the survey area exceeds a preset borders, frame color gradually changes to either blue or red. The trend changes to a blue color indicates that served an excessive amount of paint and the average of the studied zone is too high. On the other hand, the trend towards Krasnov the color shows what is served insufficient amount of paint and the average of the studied zone is too low. Changing colors is accompanied by a message indicating the number of gray levels that the measured average value differs from the set limit indicator. Message from "-1" to "-9" or "+1" to "+9", etc. are warnings and accompanied by fire yellow signal lamp. The message "too low" or "too high" indicate errors in cases when the limit value is exceeded, for example, more than 10 gray levels. The error message is accompanied by a lit yellow light or red light on the remote control.

Trends in the printing process are displayed in the window 24 production control in addition to the main window. It displays the results on the last sheet. Includes five parameters: the total number of errors number of warnings "low" values, the number of alerts for errors "low" values, the number of warnings "high" values, the number of alerts for errors "high" values on the sheet and the number of errors by barcodes. Error bar codes occur in cases where the system does not detect a bar code or finds the wrong piece is ioway code.

Specialist in the art should understand that in the framework of the invention can also choose the means of illumination sources of visible or infrared radiation, depending on the absorbed wavelength paints, and also depending on whether the camera - photosensitive device to detect light re-emitted by the printed products, for example, the image printed using fluorescent dyes or visible inks having different wavelength radiation in the infrared spectrum.

1. Fluorescent sensor device, containing a number of sub-blocks, optical sensing elements installed in series and placed in a common sealed housing, with each specified sub-block that is installed in the specified package, contains

the means of illumination, made with the ability to cause the illumination of a given area of the sample;

means a digital camera that contains the front part of the camera;

funds mirror that collects light emitted from the above plot of the sample and guides it in front of the camera; and

a digital signal processor that processes signals generated by the front of the camera.

2. The device according to claim 1, in which the above camera is a CMOS camera.

3. the device according to claim 1, in which the device further comprises an interface, the interface includes a bus, a fire alarm, connecting the above-mentioned digital signal processors with a computer.

4. The device according to claim 1, in which each tool mirrors the above sub-block consists of a parabolic mirror and in front of the installed mirror.

5. The device according to claim 1, in which the above-mentioned illumination means are a means of UV radiation, while in the specified chassis includes a transparent window for ultraviolet radiation.

6. Control system for detection and control of fluorescent and phosphorescent inks printed product sheet securities fed to the printing machine, the control system contains a device according to claim 1, computer means connected with the above device, providing a comparison of the obtained image of each of the above sheets with the specified image above list.

7. The control system according to claim 6, in which the mentioned computer means connected to the specified device through an interface that contains the tire fire alarm system connecting the above-mentioned digital signal processors with the specified computer resources.

8. The control system according to claim 6, in which are specified the range is located in parallel to the above sheets and transversely to the direction of movement of the above sheets.

9. The control system of claim 8, which further comprises a suction plate placed parallel to the above row.

10. The control system according to claim 6, additionally containing an additional illumination means placed outside the building.

11. The inspection system according to claim 6, which is placed in the feeding section of the specified printing machine, in particular, before the first stack feeder.

12. The inspection system according to claim 6, in which the above camera is a CMOS camera.

13. The control system according to claim 6, in which each tool mirrors the above sub-block consists of a parabolic mirror and in front of the installed mirror.

14. The control system according to claim 6, in which the above-mentioned illumination means are a means of UV radiation, while in the specified chassis includes a transparent window for ultraviolet radiation.



 

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