JP4472887B2 - Printing paper surface inspection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printing paper surface inspection apparatus.
[0002]
[Prior art]
In the printing industry, the incorporation of just one defective printing surface can even destroy corporate social credibility. Therefore, inspection and inspection of printing paper has become increasingly important.
[0003]
In the printing industry, the inspection system is changing dramatically, especially in the field of commercial off-wheel printing. Optical sensor technology has inspected the entire high-speed paper surface during printing.
[0004]
For example, there is a demand for an apparatus that issues a warning immediately when a defective printed paper surface is detected and automatically performs a paper discharge process.
[0005]
[Problems to be solved by the invention]
The objective of this invention is providing the printing paper surface inspection apparatus which can test | inspect a defective printing paper surface more reliably and efficiently.
[0006]
[Means for Solving the Problems]
Examples of the solving means of the present invention are as follows.
[0007]
(1) When both the front and back sides of the printing paper surface are inspected and it is detected that there is a printing defect on the printing paper surface, the printing paper surface is displayed on the inspection screen as an alarm and displayed on the indicator lamp. An inspection device,
The indicator lamp has a dedicated front surface display portion on the front surface of the printing paper surface and a dedicated rear surface display portion on the back surface of the printing paper surface, and the inspection screen includes a front surface and a back surface of the printing paper surface in one inspection screen. Information on one of the main pages is displayed larger, and information on the other side is displayed smaller.
When the front display part of the indicator light is displayed, the information on the front side of the printing paper is displayed large, and the information on the back side of the printing paper is displayed small,
When the back side display part of the indicator lamp is displayed, the information on the front side of the printing paper surface is displayed small, and the information on the back side of the printing paper surface is displayed large ,
The display of the front and back surfaces of the inspection paper on the inspection screen and the display of the front and back surfaces of the inspection paper on the indicator light are color-synchronized.
A printing paper surface inspection apparatus , wherein display colors of a front surface display portion and a rear surface display portion of an indicator lamp are different colors on the front surface and the back surface of the printing paper surface .
[0008]
(2) The display lamp is configured as a laminated display lamp in which a dedicated front surface display unit on the surface of the printing paper surface and a dedicated back surface display unit on the back surface of the printing paper surface are arranged in two layers. Printing paper surface inspection device.
[0009]
(3) Stacked display in which the indicator lamp displays an alarm display unit that displays a print defect as an alarm, a dedicated front surface display unit on the surface of the printing paper, and a dedicated back surface display unit on the back side of the printing paper in three layers The printing paper surface inspection device described above, which is configured as a lamp.
[0012]
( 4 ) The printed paper surface inspection apparatus described above, wherein the display colors of the warning display portion, front surface display portion, and back surface display portion of the indicator light are different.
[0014]
( 5 ) The printing paper surface inspection apparatus described above, wherein the printing paper surface is a printing paper surface printed by an offset printing machine.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, when both the front surface and the back surface of the printing paper surface are inspected and it is detected that there is a printing failure on the printing paper surface, the printing failure is displayed on the inspection screen as an alarm, and displayed on the indicator lamp. This is an improvement of the paper surface inspection device.
[0016]
For example, the indicator lamp has a dedicated front surface display portion on the surface of the printing paper surface and a dedicated back surface display portion on the back surface of the printing paper surface.
[0017]
Preferably, the indicator lamp is configured as a laminated indicator lamp in which a dedicated front surface display unit on the surface of the printing paper surface and a dedicated back surface display unit on the back surface of the printing paper surface are arranged in two layers. Further, an alarm display unit that displays a print defect as an alarm may be added to constitute a laminated display lamp arranged in three layers.
[0018]
Moreover, it is preferable that the display of the front and back surfaces of the inspection paper surface on the inspection screen and the display of the front and back surfaces of the inspection paper surface on the indicator lamp are color-synchronized. For example, the display colors of the front and back display parts of the indicator light are different colors on the front and back sides of the printing paper, and the display colors of the alarm display part, front display part and back display part of the indicator light are different. It is preferable to do this.
[0019]
In another preferred embodiment of the present invention, the inspection screen displays a large amount of information on the main paper surface of either the front surface or the back surface of the printing paper surface in one inspection screen, and the other sub screen. The information on the page becomes smaller. For example, when the main is “front surface”, “front surface” is displayed large and “back surface” is displayed small. At the time of this display, the display color used in the laminated indicator lamp is used for color expression having the paper surface as an attribute. Thereby, the convenience of information transmission when an alarm occurs is measured.
[0020]
The printing paper surface inspection device according to the present invention is most suitable as a printing paper surface inspection device for an offset printing machine, particularly for a commercial offset rotary press line. In this case, the paper surface to be inspected has a total of two surfaces, the “front surface” and the “back surface” of the paper. When it is detected that there is a printing defect on the paper, it is displayed on the inspection screen as an alarm, and a signal is output to the laminated indicator lamp.
[0021]
In a printing paper surface inspection device for a commercial web offset press line, a sensor attached in the vicinity of the cooling part of the web press line detects the reflection density of the paper surface instantly. The detected data is compared with a reference value acquired in advance, and if a certain allowable value is exceeded, an error (printing failure) is determined, and alarms, marks, paper discharge, etc. are processed in real time. Up to 80 sensors sample the high-speed moving paper surface with fine pixels of 15 x 2 mm and automatically inspect the entire paper surface. The inspection status is displayed on the CRT screen for monitoring. An error (printing failure) can be confirmed at a glance.
[0022]
Preferably, the indicator lamp is physically independent for each paper surface. The display colors of the indicator lamps are “front” and “back”, which are different colors.
[0023]
The printing paper surface inspection device preferably has a monitor function for always displaying the inspection status during the inspection.
[0024]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. An example of a printing paper surface inspection device used for a commercial web offset press line will be described.
[0025]
FIG. 1 shows the operation principle of an optical sensor device provided in an inspection apparatus according to one embodiment of the present invention.
[0026]
The optical sensor device 10 is configured to irradiate the printing paper surface 31 with the light emitted from the light emitting unit 20 and receive the reflected light from the printing paper surface 31 by the light receiving unit 40 to convert it into an electrical quantity.
[0027]
In the optical sensor device 10 of FIG. 1, the light emitting unit 20 includes the monochromatic light emitting element 11 and its control unit 13, and the light receiving unit 40 includes the light receiving element 12.
[0028]
The control unit 13 controls the wavelength range of light emitted from the light emitting element 11, that is, the wavelength band. The control unit 13 is provided with dials 14 and 15 for that purpose.
[0029]
By operating the dials 14 and 15 of the control unit 13, it is possible to control both the width and the position of the wavelength of light applied to the printing paper surface 31.
[0030]
At the time of inspection, the printing paper surface may be stopped or may be moved in a predetermined direction.
[0031]
In FIG. 1, a mode in which light emitted from the light emitting unit 20 is applied to only one of the front surface and the back surface of the printing paper surface 31 is illustrated, but light emission is similarly performed on the other paper surface of the printing paper surface 31. The light emitted from the unit 20 is irradiated.
[0032]
The optical sensor device is constituted by a CCD sensor. Then, for example, the reference print content is read as a map, the print content and color are stored as digital signals, and then the map reflected from the print paper surface 31 to be inspected is read by the CCD sensor 12, An analog signal is converted into a digital signal, and both digital signals are compared to determine whether the printing paper surface is good or bad.
[0033]
FIG. 2 shows the main part of the inspection screen 1 of the computer and the main part of the indicator lamp 2 that is physically separated from it.
[0034]
When the printing paper surface inspection apparatus inspects both the front surface and the back surface of the printing paper surface 31 and detects that there is a printing defect on the printing paper surface 31, the printing defect is displayed on the inspection screen 31 as an alarm and displayed. Display on lamp 2.
[0035]
In the embodiment of FIG. 2, the indicator lamp 2 has a dedicated front surface display portion 2 a on the surface of the printing paper surface 31, a dedicated back surface display portion 2 b on the back surface of the printing paper surface 31, and an alarm display that displays a print defect as an alarm. Part 2c. The front surface display unit 2a, the back surface display unit 2b, and the alarm display unit 2c are arranged in three layers.
[0036]
In addition, the display of the front and back surfaces of the inspection paper surface 31 on the inspection screen 1 and the display of the front and back surfaces of the inspection paper surface 31 on the indicator lamp 2 are color-synchronized. For example, the display colors of the front surface display portion 2 a and the back surface display portion 2 b of the indicator lamp 2 are set to different colors on the front surface and the back surface of the printing paper surface 31. Furthermore, the display color of the warning display part 2c of the indicator lamp 2 is set to a color different from the display colors of the front surface display part 2a and the back surface display part 2b. As an example of these display colors, the display color of the front surface display portion 2a is yellow, the display color of the back surface display portion 2b is green or blue, and the display color of the alarm display portion 2c is red.
[0037]
One inspection screen 1 has various display portions. For example, a small series of display portions 1a, 1b, 1c, and 1d are provided on the right side of the inspection screen 1. The display portion 1a is dedicated to the cover and is lit yellow. The display portion 1b is dedicated to the cover and is displayed as being inspected. The display portion 1c is dedicated to the back side of the paper and is lit in green or blue. The display portion 1d is dedicated to the back paper surface and is displayed as being inspected.
[0038]
A pair of elongated display portions 1e and 1f are horizontally provided above and below the inspection screen 1. The display portion 1e is dedicated to the top side of the paper surface, and the display portion 1f is dedicated to the ground side of the paper surface. These display portions 1e and 1f are lit yellow when the front cover is the main paper, and light green or blue when the back is the main paper.
[0039]
The inspection screen 1 has a large monitor screen portion 1g and a small monitor screen portion 1h. In one inspection screen, information on the main paper surface of either the front surface or the back surface of the printing paper surface 31 is stored. Large information is displayed on the large monitor screen portion 1g, and information on the other sub-page is displayed small on the small monitor screen portion 1h.
[0040]
For example, as shown in FIG. 3, when the main surface is the “front surface”, the “front surface” is displayed large on the large monitor screen portion 1g, and the “back surface” is displayed small on the small monitor screen portion 1h. On the other hand, as shown in FIG. 4, when the main is the “back surface”, the “back surface” is displayed large on the large monitor screen portion 1g, and the “front surface” is displayed small on the small monitor screen portion 1h.
[0041]
At the time of such display, the above-described three display colors used in the multilayer indicator lamp 2 are used for color expression having the printing paper surface 31 as an attribute. This enhances the convenience of information transmission when an alarm occurs.
[0042]
As described above, the printing paper surface inspection apparatus has a monitor function for always displaying various inspection states during inspection.
[0043]
If a preset function is added, pre-setting can be simplified.
[0044]
Next, an outline of the inspection procedure will be described with reference to FIG.
[0045]
First, the density of the printing paper surface 31 is detected. For example, the density of the printing paper surface 31 is detected for each timing signal of the synchronous encoder at the printing speed when the optical sensor 10 is inspected (893 rpm as displayed in the upper right corner in the example of FIG. 2). The density data thus detected is digitally converted to 256 gray scales and sent to a control unit (not shown).
[0046]
Next, reference data is captured. For example, if the density data falls within the set limit range of the temporary reference value over several print sheets 31, the stability determination is made. Further, several sheets of density data are taken in, and the average value is stored as the reference sheet data.
[0047]
Next, compare the data. For example, the density data of the printing paper surface 31 to be printed next is captured in the same manner, and the inspection is started. For each subdivided point (pixel), the reference data and the data to be inspected are compared to determine good or bad.
[0048]
Next, perform the necessary processing. For example, if the printing paper surface inspection apparatus inspects both the front surface and the back surface of the printing paper surface 31 and detects that there is a printing failure on the printing paper surface 31, the printing failure is displayed on the inspection screen 31 as an alarm, And it displays on the indicator lamp 2. Further, if necessary, the automatic paper discharge device is operated by sending a defective paper marking or paper discharge signal by ink jet (optional).
[0049]
【The invention's effect】
Automatic inspection of the entire surface of all sheets can be realized, and defective shipments can be prevented.
[0050]
The print density can be automatically managed within a certain range over the entire surface of the entire paper, and quality variations can be eliminated.
[0051]
During operation, inspection can be performed automatically only by monitoring.
[0052]
By accurate error determination and paper discharge processing, it is possible to efficiently remove the waste paper.
[0053]
Due to the level of skill of the inspector and individual differences, judgments with variations are made uniform, and the standardization of the printing paper surface can be facilitated.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing the operation principle of an optical sensor device used in a printing paper surface inspection apparatus according to one embodiment of the present invention.
FIG. 2 shows the main part of the inspection screen of the computer and the main part of the indicator lamp that is physically separated from it.
FIG. 3 shows an example of a screen display when the main printing paper surface at the time of inspection is “front surface”. The “front surface” is displayed large on the large monitor screen portion, and the “back surface” is displayed small on the small monitor screen portion.
FIG. 4 shows an example of a screen display when the main printing paper surface at the time of inspection is “back surface”. The “back” is displayed large on the large monitor screen portion, and the “front” is displayed small on the small monitor screen portion.
FIG. 5 shows an outline of an inspection procedure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inspection screen 1a, 1b, 1c, 1d, 1e, 1f Display part 1g Large monitor screen part 1h Small monitor screen part 2 Indicator light 2a Front surface display part 2b Back surface display part 2c Alarm display part 31 Printing paper surface

Claims (5)

Inspecting both the front and back of the printing paper, if it detects that there is a printing defect on the printing paper, the printing paper inspection device displays the printing defect on the inspection screen as an alarm and displays it on the indicator lamp. There,
The indicator lamp has a dedicated front surface display portion on the front surface of the printing paper surface and a dedicated rear surface display portion on the back surface of the printing paper surface, and the inspection screen includes a front surface and a back surface of the printing paper surface in one inspection screen. Information on one of the main pages is displayed larger, and information on the other side is displayed smaller.
When the front display part of the indicator light is displayed, the information on the front side of the printing paper is displayed large, and the information on the back side of the printing paper is displayed small,
When the back side display part of the indicator lamp is displayed, the information on the front side of the printing paper surface is displayed small, and the information on the back side of the printing paper surface is displayed large ,
The display of the front and back surfaces of the inspection paper on the inspection screen and the display of the front and back surfaces of the inspection paper on the indicator light are color-synchronized.
A printing paper surface inspection apparatus , wherein display colors of a front surface display portion and a rear surface display portion of an indicator lamp are different colors on the front surface and the back surface of the printing paper surface .   The display lamp is configured as a laminated display lamp in which a dedicated front surface display unit on the surface of the printing paper surface and a dedicated back surface display unit on the back surface of the printing paper surface are arranged in two layers. The printed paper surface inspection apparatus described.   The indicator lamp is configured as a laminated indicator lamp that displays an alarm display unit that displays a print defect as an alarm, a dedicated front surface display unit on the surface of the printing paper, and a dedicated rear display unit on the back side of the printing paper in three layers. The printing paper surface inspection apparatus according to claim 1, wherein The printed paper surface inspection apparatus according to any one of claims 1 to 3 , wherein display colors of the warning display unit, the front surface display unit, and the back surface display unit of the indicator lamp are different colors. Printing paper is a printing paper inspection apparatus according to any one of claims 1 to 4, characterized in that a printed paper printed by an offset printing machine.

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