JPH0274348A - Inspecting apparatus for color-omission printing and reverse printing - Google Patents

Abstract

PURPOSE:To prevent the commencement of inspection without knowing that reverse printing can not be judged by a method wherein whether or not reverse printing inspection can be executed at a position for ink to be printed is displayed in a monitor television for information to an operator on the occasion when said position is specified. CONSTITUTION:When an article 1 to be inspected flowing on a line comes to a position of pickup by a television camera 2 after a position of inspection of each color is set, an inspection timing signal 5 enters an image processing device 4 from a machine controller 3, an image is subjected thereby to A/D conversion and taken in a density level memory of 256 gradations. This image is processed, inspection for color-omission printing and reverse printing is executed, and when there is any abnormality, an abnormality signal 6 is outputted to the machine controller 3.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is an inspection bag for unprinting and reverse printing of prepaid cards, etc.! It is related to.

<Prior Art and Problems to be Solved> Inspection of off-printing and reverse printing of printed matter in which marks of each color ink are not printed in the margins of the printed matter has been carried out as follows.

First, in the inspection of deprinting, the first inspection object on which each color has been correctly printed is displayed on a black-and-white monitor television, the inspection position for each color is designated, and this position and density are memorized. Then, deprinting is inspected by checking whether this density is included in the same position of the subsequent inspection object.

In addition, reverse printing inspection is a side effect of deprinting inspection.
This method utilizes the fact that if the printing material is reverse printed by being placed on a 180-degree rotary printing machine during printing, the color will no longer appear in the designated position, resulting in the same situation as off-printing. Therefore, if the same color is present at the 180-degree rotation position, it cannot be detected even if reverse printing is performed, so the inspection position must be specified while avoiding such a position.

Conventionally, when specifying the inspection position, it was difficult to distinguish colors because the monitor television was black and white, and it was difficult for the operator to determine whether the same color existed at the 180-degree rotation position (target position i1).

<Means for Solving the Problems> The present invention has been made in view of the above-mentioned current situation.
It is equipped with a television camera, an image processing device, a black and white monitor television, and a keyboard, and is configured to be able to measure the density at a symmetrical position of a designated point. To provide an off-print/reverse-printing inspection device characterized in that it is possible to notify a worker by displaying on a monitor television whether or not reverse-printing inspection can be performed.

<Examples> The present invention will be described below based on specific examples with reference to the drawings.

FIG. 1 shows an overview of this device.

After setting the inspection position for each color, the inspection object l flowing on the line is brought to the imaging position of the television camera 2 (then an inspection timing signal 5 is input from the machine controller 3 into the image processing device 4, and the image is converted into A/D. The image data is taken into memory at a density level of 256 gradations, processed, and inspected for unprinting and reverse printing. If an abnormality is found, an abnormality signal 6 is output to the machine controller 3.

FIG. 2 shows the appearance of the monitor television 7 screen when setting the inspection position for each color.

The cross cursor 10 is moved to the part printed in the color desired to be inspected by operating the key 8. This position and the density value d of the pixel are stored in the combination.

Also, check whether reverse printing inspection is possible at this position as follows. The density value d' of the peripheral area 11 of the target position is checked from the set position to the intersection of the center line 9 of the object to be inspected, which is set in advance, and the following calculation (1) is performed, and the reverse value is calculated at the specified position. A judgment is made as to whether printing inspection is possible. Since there is some variation in the density value even for the same color, if the constant α is determined appropriately and the density value satisfying d-α<d'<d+α (+) is within the peripheral 'pH pH range, the reverse printing test can be performed. If it is not possible, it is displayed on the monitor television 7 and the operator is prompted to change the setting position. If it is determined that reverse printing inspection is not possible, specify another position where the same color is printed, check again, find a position where reverse printing inspection is possible, and set that position as the inspection position. . Repeat this operation for each color you want to test.

After setting the inspection position, every time an inspection timing signal 5 is received from the machine controller 3, an image is loaded into the memory, and the density d° of the area around the set position is checked for each color, taking into account the positional deviation during image lifting. When there are no pixels in the area that have a density value that satisfies -α<d'<d+α, unprinting,
Alternatively, it determines that it is reverse printing and outputs an abnormality signal 6 to the machine controller 3.

<Effects of the Invention> As described above, according to the present invention, the inspection device determines whether reverse printing is possible even when using a black and white monitor where it is difficult to distinguish colors. This eliminates the possibility of starting an inspection without knowing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an overview of this apparatus, and FIG. 2 is an explanatory diagram of a monitor television screen when setting inspection positions for each color. 1... Object to be inspected 2... Television camera 3... Machine controller 4... Image processing device 5... Inspection timing signal 6... Abnormal signal 7... Black and white monitor television 8... Keyboard 9... Center line 10... Cross cursor 11... Surrounding area of target position Patent applicant Kazuo Oto Suzuki, Representative of Toppan Printing Co., Ltd.

Claims (1)

[Claims] 1) In the inspection of deprinting and reverse printing of prepaid cards, etc.
It is equipped with a television camera, an image processing device, a black and white monitor television, a keyboard, etc., and is configured to be able to measure the density at a symmetrical position of a designated point. A deprinting/reverse printing inspection device is characterized in that it is possible to inform a worker by displaying on a monitor television whether or not reverse printing inspection can be performed at a certain position.