JPH0363189A - Binding position shift detecting method and apparatus for detecting and discharging article to be processed shifted in binding position - Google Patents

Abstract

PURPOSE:To perform judgement rapidly without generating irregularity in results by calculating an imaging area by applying image processing to the mark on the surface of an article to be processed and calculating the shift quantity of a processing position from the comparison with the entire area of a preliminarily printed mark to perform judgement. CONSTITUTION:Yarn S as a processing material and a positional shift detection mark M2 having a color sufficiently taking the contrast with the surface of a printed book are applied to the surface of the printed book being an article to be processed at a processing scheduled position. This positional shift detection mark M2 is caught in a stationary image state from above by a CCD camera to perform image processing. By this method, the area of the mark part is measured and the measured result is compared with an internally set upper limit value to make it possible to judge the degree of positional shift. Further, positional shift quantity itself is operated with high accuracy by the calibration of the area incremental quantity and processing positional shift quantity of the mark part to be outputted and can be also used in processing position correction feedback.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a binding position deviation detection method and device for inspecting the quality of processing positions in bookbinding processing, wire production processing, etc. The invention relates to a device for discharging defective products.

[Conventional technology]

Conventionally, in the technology of stacking sheets of paper or elastic material on top of each other and binding some of them together, marks are imprinted at predetermined positions on the surface of the workpiece, and when processing is performed on top of that with a thread-like processing material, the processing material The inspector visually inspected whether or not the mark was accurately located on the mark.

Another method is to measure the distance between the workpiece and the edge of the workpiece to check the position of the workpiece relative to the workpiece.

[Problem to be solved by the invention]

However, in such conventional technology, since the inspector visually inspects the machining position off-line after machining, it is impossible to provide feedback for modifying the machining position during machining, and it is difficult for individual inspectors to visually inspect the machining position. There was a problem that the criteria for judgment were not constant.

In addition, in the method of measuring the distance of the processing material from the edge of the workpiece, the measurement is based on the edge of the workpiece, so if a predetermined pattern is imprinted on the surface of the workpiece, Another problem is that it is not possible to measure the positional deviation of the workpiece based on the pattern.

The present invention aims to solve these problems by inspecting the positional deviation of all workpieces online without stopping them on the conveyor immediately after processing, and checking the pattern on the surface of the workpiece. It is an object of the present invention to provide a method and device for inspecting whether processing is performed at the correct position, and a device for eliminating defective products based on the measurement results.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention imprints a mark in advance on a predetermined position on the surface of the workpiece in a color that provides a sufficient contrast difference with the workpiece material, and after the workpiece is continuously stitched with the thread-like workpiece material, the When detecting the amount of machining position deviation by measuring the degree of exposure of the machining area that is at least partially covered by the machining material, the mark on the surface of the workpiece after machining is captured as an optical image, and the same image is The method is characterized in that the image area is calculated by image processing, and the processing position shift amount is determined by comparing the image area with a reference area that has been set and registered in advance.

The present invention also provides a trigger pulse synthesis device that detects a mark with an optical sensor and synthesizes trigger pulses for capturing an image of the mark, and a trigger pulse synthesis device that detects a mark with an optical sensor and synthesizes a trigger pulse for capturing an image of the mark, and a An image capture device captures a still image, and the image captured by the image capture device is binarized to calculate the area of the image, compared with an internally set upper limit value, and if the upper limit value is exceeded, a pulse is generated. The present invention is characterized by comprising an image processing device that outputs a signal.

Furthermore, the present invention provides a trigger pulse synthesis device that detects a mark with an optical sensor and synthesizes trigger pulses for capturing an image of the mark, and a trigger pulse synthesis device that detects a mark using an optical sensor and synthesizes a trigger pulse for capturing an image of the mark, and a trigger pulse synthesis device that detects a mark using an optical sensor. An image capture device that captures a still image, and a binarization process for the image captured by the image capture device to calculate the area of the image.
An image processing device that compares with an internally set upper limit value and outputs a pulse signal if the upper limit value is exceeded, and a reject device that extracts defective workpieces from the transport device using the pulse signal output from the image processing device. It is characterized by being equipped with a device.

[Effect]

In the method of the present invention, a mark is printed in advance at a predetermined position on the surface of the workpiece in a color that has a sufficient contrast with the workpiece material, and a part of the mark is covered with thread-like workpiece material by continuous processing of the workpiece. This exposed portion is captured as an optical image during detection, and this image is processed to form an image area, and the image area is compared with a reference area that has been set and registered in advance.

Furthermore, in the apparatus of the present invention, when a mark imprinted at a predetermined position on the surface of the workpiece passes under the optical sensor, the spot of the sensor scans the mark, causing the trigger pulse synthesizer to Trigger pulses are synthesized at the trigger pulse synthesizer, and a still image of the moving mark activated by the trigger pulse from the trigger pulse synthesizer is captured into the image capturing device, where it is binarized and converted into an area value. , and an internally set upper limit value, and if the result exceeds the upper limit value, a pulse signal is output from the image processing device.

Furthermore, in the apparatus of the present invention, a reject device for removing a defective workpiece from the workpiece conveyance device is operated by the pulse signal.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a sewing machine binding position inspection device in a passbook manufacturing process will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of the position inspection device, and as shown in the figure, this device includes a trigger pulse synthesis device 1, an image capture device 2, an image processing device 3, and a reject device 4.

The trigger pulse synthesis device 1 in this device detects a timing mark with a laser sensor as an optical sensor and synthesizes a trigger pulse for capturing an image of the same mark.

Further, the image capture device 2 activates an electronic shutter of a CCD electronic shutter camera using a trigger pulse from the trigger pulse synthesis device 1 to capture a still image of a moving mark.

Then, the image processing device 3 binarizes the image captured by the image capture device 2, calculates its area, compares it with an internally set upper limit value, and outputs a pulse signal when the upper limit value is exceeded. This is what is output.

Further, the reject device 4 uses a pulse signal output from the image processing device 3 to control a conveyor 5 as a conveying device.
As shown in the figure, it is equipped with a gate 42 that rotates around a hinge on the downstream side of the conveyance path using a solenoid operating device 41 as a fulcrum to open and close the conveyance path. A book receiver 43 is provided below the conveyance path to receive the booklet removed from the conveyance device.

FIG. 2 is a front view showing the details of the detection section in this device, and as shown in the same figure, the detection section is attached to a bracket 51 attached to the conveyor 5 and connected to a pair of parallel conveyors. A CCD electronic shutter camera 11 is installed above the belts 52 and 53, and a pair of parallel conveyor belts 52 and 53 are also installed.
An optical fiber light guide 12,13 that branches the light from the halogen lamp light source into two and guides it to the irradiation part, a fiber sensor 14 installed above the right side of the conveyance path, and an optical fiber sensor 14 installed above the left side of the conveyance path. and a laser sensor 15.

FIG. 3 shows the marks on the surface of the printing book detected by this device, and the marks M perpendicular to the processing direction are the first,
The mark M2, which is a timing mark detected by the laser sensor 15 shown in FIG.
D This is a positional deviation detection mark photographed by the electronic shutter type camera 11.

Next, the detection operation by the device configured in this way is performed in a fourth manner.
Based on the operation flowchart shown in the figure, and with reference to FIGS. 1 to 3, the explanation will be made. First, the fiber sensor 14 in the above-mentioned detection section detects the thread binding process being carried on the conveyor 5 by the conveyor belts 52 and 53. The next printed book is detected, and the apparatus enters a detection operation standby state.

Next, the laser sensor 15 of the trigger pulse synthesis device 1 scans the timing mark M1 previously imprinted on the printing book to generate a trigger pulse for image capture. This trigger pulse inputs a shutter trigger signal to the electronic shutter type camera 11 of the image capturing device 2, and the camera takes a still image of the mark M on the surface of the printing book being conveyed without blurring. Incidentally, the shutter speed of a commercially available electronic shutter camera is 115,600 seconds, which allows you to obtain still images without blurring, but CO2 without a shutter
Still images can be similarly taken using a D camera and a strobe light emitter. This image signal is then sent to the image processing device 3, where the still image frame is converted into an A/D converter.
Image processing is performed by converting, decomposing into pixel units, and binarizing the image, and calculation of area by counting black pixels is performed. This calculation result is compared with the judgment level of the area value corresponding to the pass/fail judgment boundary that has been set and input in advance in the image processing device 3, and if the result is within the tolerance value, it is output to a lamp that indicates the position is normal. be done.

On the other hand, if this value exceeds the upper limit, an NG judgment signal is output as a pulse after a certain period of time has elapsed since the fall of the fiber sensor signal (book passage check), and this signal is
It is used to operate the paste ejection device 4 for removing the prints, which is installed downstream of the print conveyor 5.

Figure 5 shows the thread S as a processed material and the positional deviation detection mark M.
As shown in Figure (a), when the processing position is good, the thread S covers most of the positional deviation detection mark 5M. However, when the processing position is shifted, as shown in FIG. 2B, the thread S is biased to one side of the misalignment detection mark Mt, so that the exposed area of the misalignment detection mark becomes larger. In addition, the same figure (al
As shown in the figure, the width of the positional deviation detection marker 5M is such that it is partially exposed even when there is no processing positional deviation, but this is done in consideration of the occurrence of measurement errors due to the inclination of the threads, etc. .

As described in detail above, according to the above-mentioned embodiment, the misalignment detection mark M is placed at the scheduled processing position on the surface of the printing book as the workpiece with a color that provides sufficient contrast with the thread S as the processing material and the surface of the printing book. ! If the printed book is bound in the correct position with the thread S, the misalignment detection mark M, will be covered by the thread S, and as it protrudes from the thread S, the area of the misalignment detection mark M, increases. Taking advantage of the fact that it can be determined that the machining position accuracy is poor, immediately after machining with the thread S, the positional deviation detection mark Mt is captured as a still image from above with a CCD camera II, and the still image is image-processed to detect the mark part. It is possible to determine whether the positional deviation is good or bad by measuring the area of the mark and comparing the result with the internally set upper limit. It is also possible to calculate and output the positional deviation amount itself with high precision by using the ration, and use it for feedback for correcting the machining position.

Although the present invention has been described in detail based on one embodiment, the present invention is not limited to the above-described embodiment, and can be implemented with various changes within the scope of the claims. However, its application is not limited to the passbook manufacturing process.

〔Effect of the invention〕

As explained above, the method of the present invention captures the mark on the surface of the workpiece after processing as an optical image, processes the image to calculate the image area, Since the process calculates and judges the amount of machining position deviation by comparing it with the total area of the mark, it not only makes it possible to judge quickly and without causing variations in the results, but also allows the process to be performed during machining. This has the effect that it can be used for operations that apply position correction feedback.

The apparatus of the present invention also includes a trigger pulse synthesizer that detects a mark with an optical sensor and synthesizes trigger pulses for capturing an image of the mark, and a trigger pulse synthesizer that is activated by the trigger pulse from the trigger pulse synthesizer to detect the mark while moving. An image capture device captures a still image of the mark, and the image captured by the same image capture device is binarized, the area of the mark is calculated, and the area is compared with the internally set upper limit. Since the image processing device is equipped with an image processing device that outputs pulses when the workpiece is moved, in addition to the above-mentioned effects, it is possible to measure the positional deviation based on the pattern while the workpiece is being conveyed without stopping.

Furthermore, since the apparatus of the present invention is equipped with a reject device that extracts defective workpieces from the conveyance device using pulse signals output from the image processing device, in addition to the above effects, it also automatically removes defective workpieces. It also has the effect of being able to eliminate it efficiently.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view of an inspection device according to an embodiment of the present invention, FIG. 2 is a front view of its detection unit, and FIG. 3 is a plan view of a mark detected thereby. FIG. 4 is a flowchart of the basic operation of the inspection device, and FIG. 5 is a plan view showing the positional relationship between the workpiece and the 7-millimeter position detection mark. l...Trigger pulse synthesis device, 2...Image capture device, 3...Image processing device, 4...Reject device,
5... Conveyor, 11... COD electronic shutter camera, 12. 13... Optical fiber light guide, 14... Fiber sensor, 15... Laser sensor, 41... Solenoid operating device, 42... Gate,
43... Book holder, 51... Bracket, 52.5
3... Conveyor belt, S... Thread as processed material, Ml... Timing mark, Ml... Positional deviation detection mark

Claims (3)

[Claims] (1) A mark is imprinted in advance on a predetermined position on the surface of the workpiece in a color that has a sufficient contrast with the workpiece, and after the workpiece is continuously processed with the thread-like workpiece, at least a portion of the workpiece is covered with the workpiece. When detecting the amount of machining position deviation by measuring the degree of exposure of the marked mark, the mark on the surface of the workpiece after processing is captured as an optical image, and the image is processed to calculate the image area. A binding position deviation detection method characterized by determining a machining position deviation defect by comparing the same image area with a reference area set and registered in advance. (2) A trigger pulse synthesizer that detects a mark with an optical sensor and synthesizes trigger pulses for capturing an image of the mark, and a trigger pulse synthesizer that is activated by the trigger pulse from the trigger pulse synthesizer to generate a still image of the moving mark. The image capture device that captures the image captures the image, and the image captured by the same image capture device is binarized, the area of the mark portion is calculated, and the area is compared with the internally set upper limit value, and if the upper limit value is exceeded, a pulse signal is generated. What is claimed is: 1. A binding position deviation detection device comprising: an image processing device for outputting an image; (3) A trigger pulse synthesizer that detects a mark with an optical sensor and synthesizes trigger pulses for capturing an image of the mark, and a trigger pulse synthesizer that is activated by the trigger pulse from the trigger pulse synthesizer to generate a still image of the moving mark. The image capture device that captures the image captures the image, and the image captured by the same image capture device is binarized, the area of the mark portion is calculated, and the area is compared with the internally set upper limit value, and if the upper limit value is exceeded, a pulse signal is generated. What is claimed is: 1. A detecting and discharging device for detecting and discharging workpieces with misaligned binding, comprising: an image processing device that outputs an image; and a reject device that extracts a defective workpiece from a conveying device using a pulse signal output from the image processing device.