JPS6027596A - Misprint monitoring method and misprint monitoring device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for monitoring irregular pages and an apparatus for monitoring irregular pages that occur during the bookbinding process.

Conventional misprint monitoring devices print a mark such as a spine label on the back of the folded pages, detect the mark using an optical sensor,
It was used to identify whether the signature was normal or not. However, with this conventional device, the backing label must be printed on the signature, and the position of the backing tag varies depending on the printed matter, so the installation position of the backing label detector must be adjusted depending on the printed matter being handled. I had to.

In addition, since printing M1 is folded one at a time by a machine, compared to conventional hand folding, folding may be uneven or misaligned, and the spine may be folded in and disappear, causing the machine to malfunction each time. or stopped.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for monitoring irregular pages that can detect and eliminate irregular pages regardless of the type of printed matter or the presence or absence of a backing label, by eliminating the drawbacks of the prior art described above.

The method for monitoring irregular pages of the present invention is to shine light onto a sheet of paper and determine whether the sheet is of the same type or of a different type based on the difference in the amount of reflected light.

The misprint monitoring device of the present invention first stores the signal of the bottom page of the standard signature in a memory, then stores the signal of the bottom page of the monitored signature in another memory, and compares the two. to determine if the paper is different.

In the method for monitoring irregular pages of the present invention, a plurality of points on a sheet of paper are used as measurement points. For this reason, the sensor section of the misprint monitoring device according to the present invention includes a plurality of optical sensors.

However, this comparison could simply be made as 13+-[E+'=0 (E+ is the signal from the 1Jil paper measured by one optical sensor, and E+' is the signal from the monitoring paper.) Unevenness in the paper surface, measurement errors, deviations of 1σ, etc. can all be judged as defective. Therefore, we set E+ -E+'<±M, and when measuring the amount of reflected light at the same position a'3 as M, 13
A defect level that is thought to occur is entered, and a judgment is made that the signals are not the same when this level is exceeded.

However, a single spot of dirt or a small area of uneven printing can often result in differences even on the same page when viewed microscopically. Therefore, when two sheets of paper m1 are measured and the individual measurement points are compared, there will be some points where - does not give the same signal depending on the extent n. Therefore, in the present invention, the points that are defective after comparing the same positions are totaled, and the ratio of the number of defective points to the number of all measurement points is set in advance. Beyond this ratio,
It is determined that the monitored paper is a different type of paper.

The principle explained above is illustrated in FIG. 1.

The vertical axis shows the reflected light m from the paper surface. The axis Δ indicates the level of the pure white paper surface, and the axis B indicates the level of the pure black paper surface. Also,
(A) (C) (C)... (G) indicates the measurement position, that is, the position of the optical sensor. Therefore, in this example, the sensor section is provided with seven optical sensors.

Signal 100 indicates a standard paper signal, signal 100a is a signal obtained by adding defect level M to signal 1oo, and signal 100a is a signal obtained by adding defect level M to signal 1oo.
0b is a signal obtained by subtracting the defective level M from the signal 100. Measure the monitoring paper surface and get the signal ICl0a and signal 100b.
If there are more than a predetermined number of measurement points between
It is determined that the paper is of the same type.

Now, even though the monitored paper is of the same type, the density of the ink changes over time, or (
4.Due to differences in the material of the paper surface, etc., the amount of reflected light may vary, resulting in different types. In order to avoid this J, Una discrimination error, the correction level α is added or subtracted from E+' and compared as E+ - (E+' ±cz) < 10M, and the difference in reflected light amount is corrected before making a judgment. zu°J: Unizuru.

For example, if the ink on the monitoring paper is dark, the
101 (FIG. 1) approaches axis B in its entirety. If the signal 101 is compared with the signal 100 as it is, it will be determined that the monitored paper is of a different type, so the correction level α is added to the signal @101 and the signal 101' is used for comparison.

Hereinafter, a preferred embodiment of the present invention will be described with reference to FIG.

FIG. 2 shows a block diagram of a misprint monitoring device according to the present invention.

The sensor unit 1 (J, T) is fixed to the signature stacking table (hereinafter simply referred to as the frame) of the T machine and monitors the bottom page of the signatures stacked on the frame of the T machine. For example, If there are n frames,
n pieces of senna part 1 are also required. N011...No,
n indicates the frame number. The sensor section 1 is composed of a plurality of optical sensors. Therefore, the misprint monitoring device of the present invention uses a plurality of points as measurement points. The sensor unit 1 is made to reflect the light from a light source lamp onto the paper surface, and convert the reflected light into an analog quantity of electricity using an optical sensor.

The output of the lens part 1 is amplified by an amplifier 2. The amplifier 2 is preferably a buffer amplifier that performs impedance conversion in order to prevent noise and the like from entering.

The amplified signal is sent to a multibrella 4°-79. The analog signal is time-divided by the multiplexer 79 and sent to the AD converter 13 one after another. In the AD converter 13, the analog signal is converted into a digital signal.

This operation converts the analog signal into a digital signal.
According to instructions from the memory controller 14, the data are stored in the storage circuit 75 for each measurement point.

The case where there is one frame will be described below.

The same idea can be applied to the case where there are multiple frames.

The memory circuit 75 is largely a standard memory 15 due to its role.
and a monitoring memory 16. There is no functional difference between the standard memory 15 and the monitoring memory 16. The memory 15 stores information on standard paper, and the memory 16
stores the information on the monitoring paper. The operations of memory 15 and memory 16 are as follows.

The contents of the memory 16 are compared with the contents of the memory 15 by a level failure detector 31, and if there is a difference of more than a predetermined failure level M, it is detected as a failure point. That is, the information of the first measurement point on the standard paper surface of the memory 15 (hereinafter referred to as E
+) is derived to the level failure detector 31. Next, the information of the first measurement point on the monitoring paper in the memory 16 (
Hereinafter, E1') is led to the level defect detector 31.

Then, the level defect detector 31 determines whether E+' is a defective point by determining E+-(ET'±α)<±M. The modification level α is arbitrarily set by the modification level setter 90. For example, when there is no change in the density of ink on the standard paper surface, the level α is set to O. The defective level M is arbitrarily set by the defective level setter 32.

If E+' is a defective signal, the level defect detector 31
One pulse is sent to the defective rate detector 51. The defect rate detector 51 counts the number of pulses. Next, the information on the second measuring point on the standard paper (E2) and the information on the second measuring point on the monitoring paper (E2') are compared in the same way to determine whether E2' is a defective signal. be done. This operation is performed for all measurement points.

When all measurement points are compared in this way, the number of defective signals is stored in the defective rate detector 51. Whether or not a signature is defective is determined based on the ratio of the number of defective signals to the total number of measurement points.

The defective rate setter 42 sets the proportion of defective signals to the total number of measurement points. For example, if the defective rate setter 42 is
When set to 0%, if the total number of measurement points is 10, the limit for the number of defective signals is 2 points. These two pieces of information are sent from the defective rate setter 42 to the defective rate detector 51.

The number of defective signals is stored in the defective rate detector 51,
The number of defect signals and the number of defect signals sent from the defect rate setting device 42 are
C information is compared, and a signal indicating whether the monitored papers are of the same type or different types is sent to the continuous failure occurrence detector 61.

The continuous failure occurrence detector 61 does not issue a failure command to a command circuit (not shown) as a final failure only when the number of failure determinations reaches the number set by the continuous failure count setting device 62. . If the consecutive defective count setting device 62 determines that even one sheet is defective, it can issue a defect command, but in the case of misprinted pages due to a loading error, about 50 to 100 sheets will be defective in a row, so continuous defective sheets will be issued. If the number of times setter 62 is set to 3, for example, a defect command will be issued only when a defect is found three times in a row. The setting of the number of consecutive failures setter 62 can be set arbitrarily, and this number of consecutive failures setter 62 makes it possible to monitor only the irregular pages due to loading errors. The final defect determination issued to the command circuit is notified to the operator by sounding a buzzer or stopping the T-synthesis.

It is also possible to automatically set the defective level M in the defective level setter 32 at J3 and the defective rate in the defective rate setter 42. FIG. 2 shows an embodiment in which the defective level M and the defective rate are automatically set.

When the standard sheet is placed on the folding stacking table, the automatic discrimination level setting device 86 sets the defective level M and the defective rate by the following operation.

For example, if there is a frame from No. 1 to N006, N
o, 1 mark 111i paper surface and No. 12 standard paper surface, No.
The standard paper sizes are compared in all 15 combinations, such as the standard paper size of No. 1 and the standard paper size of N083. At this time, the defective level M and the defective rate are set to appropriate values. Comparison between standard sheets is performed according to instructions from the memory controller 14. Since there are no two standard papers with the same space, it is possible to compare standard papers with each other.
11, if it is determined that they are of the same type, the set values for the defective level M and defective rate are large. Therefore, the value of the defective level M or defective rate is automatically reduced by the automatic discrimination level setter 86. Conversely, if all the standard sheets are determined to be "different types", the values of the defective level M and the defective rate are sufficiently small. However, if the defective level M and the ratio of defective rate are too small, "same type" may be changed to "different type".
Since a discrimination error occurs, the values of the defective level M and the defective rate are slightly increased by the automatic discrimination level setter 86.

The automatic discrimination level setter 86 repeats the above operations,
The defective level setter 32 and defective rate setter 42 have the largest defective level M718 that can distinguish all the standard sheets from each other! and the defective rate.

As described above, in the present invention, it is possible to perform comparisons by adding or subtracting the correction level α to the actual measured value by the optical sensor. It is possible to correct changes in the amount of reflected light due to Therefore, there are very few errors in determining whether the same type of paper is a different type of paper. 4. Brief explanation of the drawings Figure 1 is an explanatory diagram of the principle of the method for monitoring disordered pages of the present invention, Figure 2
The figure is a block diagram showing an example of a misprint monitoring device of the present invention.

1...Sensor section 2...Amplifier 13...AD converter 14...Memory controller 1~Roller 15...Standard memory 16...Monitoring memory 31...Level failure detector 32...Failure level setter 42...Defective rate setting device 51...Defect rate detector 61... Continuous failure occurrence detector 62...Continuous failure count setting device 86...Discrimination level automatic setter 90... Correction level setter Patent applicant: Kita Denshi Co., Ltd. Representative Patent Attorney Toru Tanabe

Claims (2)

[Claims] (1) Increase or subtract multiple side stop levels on the monitoring paper surface and the standard paper surface, and calculate the difference between the amount of reflected light and the amount of light reflected from the standard paper surface by increasing or subtracting the correction level. A method for monitoring irregular pages, characterized in that the number of measurement points where the difference exceeds a predetermined level is taken for each measurement 1ia and the number of measurement points is compared with the number of all measurement points to monitor the number of irregular pages. (2) Installed on each fold stacking table of the collating machine used in bookbinding,
and a sensor unit composed of a plurality of optical sensors, an amplifier for amplifying each output from the optical sensor, a multiplexer for time-divisionally dividing each output from the amplifier and sequentially sending it to an AD converter, and 〇 Standard memory and monitoring memory that store the digital signals converted by the converter, a level failure detector for comparing the contents of each memory with a predetermined level, and a level failure detector that corresponds to the intensity of the amount of foul light from the monitoring paper. a correction level setting device for setting a correction level to be added or subtracted from the contents of the monitoring memory; and a defective rate detector for comparing the number of defective signals from the level defective detector and the number of measurement points; measuring the bottom paper surface of the standard signature placed on each of the signature stacking tables with the optical sensor of the sensor unit, converting the output into a digital signal with an AD Sicon converter and storing it in the standard memory;
Roughly measure the bottom paper surface of the monitoring signatures placed on each of the signature stacking tables using the optical sensor 4 of the sensor section, and convert the output horn into a digital signal by the AD converter and store it in the monitoring memory. The difference between the stored value, the value obtained by adding or subtracting the correction level from the contents of the monitoring memory, and the contents of the standard memory is calculated for each measurement point, and the number of defective signals for which the difference exceeds a predetermined level is calculated. A device for monitoring irregular pages, characterized in that the number of defective signals is stored in the defective rate detector, and the number of defective signals is compared with the number of all measurement points to monitor irregular pages.