JPS63228165A - Plate inspection device - Google Patents

Abstract

PURPOSE:To permit speeding up of plate inspection by comparing TV signals in an analog state at the time of comparison by a comparator. CONSTITUTION:The TV signals (analog signals) obtd. by two units of cameras 30, 31 are inputted to a comparator 50 and are compared. The comparator sends the signal indicating abnormality to a CPU 52 if the two signals vary and the level thereof is above the specified level. Since the comparison in the comparator is executed by the analog signals in such a manner, the plate inspection is more inexpensive than a digital comparison and in addition, the plate inspection is speeded up.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a plate inspection device for printing, and more particularly, to a device for displaying two plates (usually an old edition and a new edition) in different colors on a TV monitor. This invention relates to a plate inspection device that visually inspects plates to see if there are any different parts.

[Subject skill]

Conventionally, two plates are placed on a table, these two plates are imaged by two TV cameras, and the obtained signals are projected on the TV monitor in different colors, respectively. For example, a plate inspection device for visually inspecting the displayed image on a TV monitor is disclosed in Japanese Unexamined Patent Application Publication No. 1988-57 filed by the same applicant.
This is known from, for example, Japanese Patent No. 108854.

In addition, Japanese Patent Application No. 60-213549 filed by the same applicant is
This is a further improved and simplified plate inspection device.

[Problem that the invention seeks to solve]

The present invention further relates to an improvement of this type of device, and is a plate inspection device that can handle severe plate inspections such as those used for printing efficacy labels inserted into pharmaceutical boxes, for example.

In other words, when printing drug efficacy statements, even the slightest mistake in the content cannot be tolerated (if "ka" becomes "ga" due to adhesion of dirt, etc., it can cause a big social problem). There is a risk of triggering.

In order to meet such plate inspection requirements, the present invention provides a printing plate inspection device that has been further improved.

Means for Solving Problem C] The present invention provides a plate inspection device using a TV monitor of this kind, in other words, when printing, the patterns of two plates are displayed in an overlapping manner, and different parts of the plates are displayed. This is a plate inspection device that compares and inspects two plates, and includes an For printing, it is equipped with a TV camera, a monitor TV that can overlay video signals from the TV camera and display them in different colors, a comparator that compares the signals from the two TV cameras, an operation panel that controls the device, etc. In the plate inspection apparatus, the table is moved in a matrix, and the table is moved in a matrix, and the TV signal is compared in analog form when the comparator compares the TV signal.

〔Example〕

The present invention will be explained in detail below with reference to the drawings.

As shown in FIGS. 1 and 2, this plate inspection apparatus includes an XY table 20 movable in the X and Y directions on which two plates to be inspected and ii are placed. XY table 2
0 is such that two plates 1O111 are fixedly placed in the correct position with register pins. At least one of the plates is configured to be slightly rotated with respect to the table 20. This minute rotation is made by turning the screws 2 and 1, so that even if the two plates 10.11 are in a twisted position with respect to the TV camera 30.31, they can be corrected to the correct position. ing. Light 1 for illuminating each of these two plates 10.11 through transmission [
It is equipped with four light sources: 22, 23, and a light source 24.25 for illuminating by reflection.If the plate 10.11 is a transmissive type, the light source 22.23 is used, and if the plate 10.11 is a reflective type, the light source 24.2 is provided.
5 lights up to illuminate each one. TV cameras 30 and 31 are installed on the upper side of the XY table 20 to take pictures of each plate 1O111, and one camera 31
is attached so as to be able to move slightly in the X and Y directions, and this movement is achieved by rotating the screws 32 and 33. Thereby, even if the plates 10 and 11 are slightly misaligned in the X and Y directions with respect to the cameras 30 and 31, it can be corrected. Said screws 21.32.33 place the printing plate 10.11 in the correct corresponding position relative to the camera.

The two plates 10° and 11 placed on the table 20 are TVs.
Cameras 30 and 31 take photographs of corresponding portions divided into a matrix according to the movement of table 20. That is, as shown in FIG. 3, in this embodiment, there are 18 rows and 30 columns.
The image is divided into 40 parts, and as shown in the figure, each square is assigned an address from 1 to 540. As the table 20 is moved, the photographing order is divided into 1, 2, 3, . . . 540, and one shadow is taken, but when the plate is small or the part of the plate that needs to be inspected is small. (For example, when there are characters only in a part of the plate), by specifying two addresses from the panel 80, the CPU 52 automatically controls the right angle 4 with the two addresses as diagonals. It is configured so that only the rectangular part is automatically photographed and the plate inspection described below is performed.

TV signals (analog signals) obtained from the two cameras 30 and 31 are sent to a TV controller 27 and a comparator 50, as shown in FIG. Furthermore, this TV controller 27
The two images of versions 10 and 11 are displayed on the monitor TV in different colors and superimposed for visual inspection. The output signal from the comparator is sent to the TV combination roller 27.
and is also sent to the CPU 52. A memory 54 and a printer 60 are connected to the CPU 52.

Furthermore, a moving mechanism 70 for moving the XY table 20, an operation panel 80, etc. are also connected to the CPU 52.

Now, the video signals obtained by the cameras 30 and 31 are sent to the TV controller 27, and are further displayed on the monitor TV 2O in a different color. The images from the above are displayed as magenta M overlapping each other.

(This color can be arbitrarily selected using the switch on the panel 80.

) If the two versions 10.12 have exactly the same pattern, the pattern will be displayed as blue-violet B, which is a mixture of C and M, but if there are different parts,
Since the portion is displayed as C or M, the different portion can be easily determined by visual inspection.

On the other hand, the signals from the cameras 30 and 31 are input to the comparator 50 and compared, and if the two signals are different and the level is above a certain level, the TV controller 27,
A signal indicating that there is an abnormality is sent to the CPU 52. The above level can be adjusted using a knob 82 on an operation panel 80. Different parts of the image on the monitor TV 2B can be flashed (blinked) as needed, so that the position can be seen more clearly than if the colors simply change. Whether or not to perform this flushing can be selected using a switch on the panel 80.

That is, it is easier to detect different positions by flashing, but it is better not to use flashing to visually determine whether the different parts are good or bad, so either can be selected.

Due to the abnormal output signal from the comparator 50 that the two signals are different and the address signal from the moving mechanism 70, the
The PU 52 can store in the memory 54 the address at which the different parts of version 10.11 are located.

The memory 54 can also store plate inspection boxes [(addresses to be inspected) according to instructions from the panel, and at the time of plate inspection, the table 20 is sequentially moved from the specified range to the address in the specified range. The range of the corresponding version 10.11 is checked.

Next, the plate inspection work of this plate inspection apparatus will be explained.

First, in the normal plate inspection mode (plate inspection mode 1), the plate is inspected as follows. When a plate inspection range is specified in advance using the panel 80, the addresses in the specified range are sequentially photographed, and the comparator 50 detects whether there is an abnormality (a difference in level of more than a certain level in the signals from the two cameras). The address where the abnormality occurred is stored in the memory 54. After scanning the entire area to be inspected in this way, when the operator turns on the panel, the first address stored as abnormal in the memory 54 will be photographed by the TV camera. The table 20 moves, and the part corresponding to that address is displayed on the monitor TV 2B, and the operator visually determines whether or not that part is defective. If it is determined to be OK, a switch on the panel 80 is pressed, and the next stored abnormality address is automatically moved and that part is displayed to make a determination. Proceed with the plate inspection in the same manner.

In mode 1 plate inspection, the operator is not bound to the plate inspection device during scanning.

In the second plate inspection mode 2, when an abnormality is detected during scanning, the scanning is stopped, the quality of the address is determined, and the plate inspection can proceed to the next step.

In the third plate inspection mode 3, the address to be inspected advances one by one each time the switch on the panel 80 is pressed.

Note that the printer 60 prints out abnormal addresses and the like.

〔Effect of the invention〕

Since the present invention has the above-mentioned configuration, it has excellent practical effects as shown below.

In other words, in this type of plate inspection device, the comparison in the comparator is performed using analog signals, which is not only cheaper than digital comparison, but also increases the plate inspection speed (
can do.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing the entire plate inspection device, FIG. 2 is a front view of the entire plate inspection device, and FIG. 3 is a perspective view showing the entire plate inspection device. Explanatory diagram showing the address of 4th
The figure is a block diagram of the main plate inspection device. 10.11...plate 20...table 21.32.33...screws 22.23.24.25...light source 27...TV controller 28...monitor TV 30.31... Camera 50...Comparator 52...CPU 54...Memory 60...Printer 70...Table moving mechanism 80...Operation panel 82...Knobs

Claims (1)

[Claims] 1) A plate inspection device that displays the patterns of two plates in an overlapping manner during printing, and compares and inspects the different parts.The two plates are placed in parallel and moved in the X and Y directions. An XY table, two TV cameras placed on the top of this table to photograph each plate, and a monitor T that can overlay the video signals from the TV cameras and display them in different colors.
V. In a plate inspection device for printing that is equipped with a comparator that compares signals from two TV cameras, an operation panel that controls the device, etc., when comparing the comparators, the TV signals are compared in analog form. A plate inspection device that is characterized by: