The misdetection detection methods currently used can be roughly divided into photoelectric sensor for color mark position inspection, graphic grayscale inspection, barcode inspection and visual photography inspection.
Color mark position detection error post
Detection by color mark position is a relatively simple method for detecting wrong posts, which has been widely used in Ziguang company's collating machine.
The working principle is that different signatures print black icons on different positions of their spines, and use the photoelectric sensor to detect the position of the black icons to determine whether different signatures are put into the station by mistake.
The advantages of this method are: simple structure and cheap price.
Disadvantages are: higher requirements for the printing of the black icon position on the spine after folding and the adjustment of the photoelectric sensor. This requires the operator to have more experience in the adjustment of the photoelectric sensor in addition to the accuracy of the sticker provided in the previous process. , And the photoelectric sensor must not be contaminated by paper hair or paper scraps; the reliability of checking the wrong post is not very high. If the signature is thin, the color mark on the spine of the signature will be narrow. After the wrong signature is mixed in It is more difficult to find out, and the incorrect placement of the signatures will also cause missed inspections.
Graph grayscale detection error post
The working principle of detecting wrong posts through the difference of the gray scale of the text is to use the photoelectric sensor to sample the gray value of the text in the signature. Compare and analyze it with the standard value in the pre-existing detection instrument. If the difference between the two is greater than the set threshold, the instrument will consider this signature to be a wrong signature. According to the difference in gray scale of different signatures, high-precision, medium-precision and low-precision detection can be selected on the meter, and different thresholds can be set. This method is particularly suitable for book signatures with color patterns and comics.
The advantages of this method are: the price is moderate, and it has been accepted by many users; the instrument is embedded in the paving machine table of the saddle stitching linkage line, and the functions such as alarm and wrong stop can be effectively combined with the electrical control function of the saddle stitching linkage line Combined together, the whole is beautiful; can be easily installed on the Ziguang saddle stitching linkage line.
The disadvantage is: because the wrong grayscale detection of the text and text is to detect and compare the grayscale value of the text and text within the specified range, the operator is required to stack the signatures in the book bucket and the folding must be neat, otherwise the signatures The relative position in the detection area may move, causing a large difference from the standard gray value and causing false detection; the ink color depth on the same signature is required to be basically the same, otherwise the instrument will mistakenly think that the gray value of the signature is different and cause an error Inspection, which increases the number of stops and affects work efficiency; if the printed graphics are all small text and the gray value of the signature in the detection area does not change much, the false detection rate may be high, causing the machine to stop frequently. Using this inspection method will not be suitable. [next]
Barcode detection error
If the false detection rate is high when using graphic grayscale to detect wrong posts, it is recommended to use barcode to detect wrong posts.
Its working principle is that different bar codes are printed on the long and short sides of different book signatures. Through the recognition of the bar code reader, compared with the standard bar code, it is easy to distinguish whether there are wrong posts in the binding process.
The advantage of this method is that it can be installed on many book binding equipment, the application range is wider than the grayscale detection of pictures and texts, and more types of wrong posts can be identified; it has already been applied on the Ziguang saddle stitching linkage line.
The disadvantage is: because the barcode must be cut off at the end, it will increase the loss of paper; during the inspection and debugging process, the installation position of the barcode reader is limited, and it will change with the change of the position of the barcode on the signature. Improper debugging will also Misdetection or missed detection occurred.
CCD image detection wrong post
CCD image detection of wrong posts is one of the more advanced methods in the binding device to detect wrong posts. Its working principle is: input a standard template image in the detector in advance, perform necessary spectrum conversion and data processing on it, and store it in the specified memory address, and use high definition, The high-speed camera lens ingests the signature content online, compares it with the template image after necessary data processing, and judges whether the signature position is correct according to the similarity between the two, and the similarity can be performed in the instrument Settings.
The advantages of this method are: the detection of wrong posts is more objective, reasonable and accurate; the neatness of the placement of the signatures in the book bucket and the folding accuracy of the folding machine are more relaxed than the grayscale detection of false signatures Much more.
The disadvantage is that the device is relatively expensive and cannot be widely promoted yet.
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