RU2848420C1 - System for automatic detection and marking of defective products - Google Patents

Abstract

FIELD: printing.

SUBSTANCE: invention relates to the field of quality control of printed products and concerns a system for automatic control and marking of defective printed products. The system includes a conveyor for moving the products being inspected, a video camera located above the product and directed at the product, a light source located above the product that creates an illuminated field, a computer trained to recognise defects, a display for visualising the products being inspected, and an inkjet printer. The computer is connected to the video camera, the current control display, and the inkjet printer, and is designed to receive images from the video camera, recognise defective products in the received images, and transmit a signal to the inkjet printer to mark the defective product with a control mark. The conveyor is a high-speed conveyor with a speed of 100-200 m/min.

EFFECT: enabling the search and sorting of substandard products at high conveyor speeds and simplifying the identification and removal of substandard products from the batch at subsequent stages of the technological process.

1 cl, 2 dwg

Description

The invention relates to the field of printing industry and can be used in quality control of printed products.

A device for monitoring the quality of a moving web is known (patent RU 2296991 C2, class IPC G01N 33/36 "Device for detecting and recording defects on moving fabric", published 10.04.2007 Bulletin No. 10), comprising a pulsed light source mounted above the plane of movement of the web, a web speed sensor, a unit for measuring the periodicity of the web pattern, and a synchronization unit, the inputs of which are connected respectively to the output of the speed sensor and the output of the unit for measuring the periodicity of the pattern, and the output of the synchronization unit is connected to the light source. The pulsation frequency of the light source is set depending on the speed of movement of the web.

A disadvantage of the described device is human involvement in the technological process and, consequently, a decrease in inspection quality due to high conveyor speeds and the fatigue of the inspection technician. Human involvement can also be a barrier to increased productivity.

The closest to the claimed technical solution is a method and device for detecting substandard products in a tray with eggs (Method for detecting substandard products in a tray with eggs. No. RU 2759733. IPC A01K 43/00), characterized in that filled egg trays are moved on a conveyor through a detection system containing a video camera connected to a machine vision controller that processes the image obtained from the video camera, a sensor for the presence of products on the conveyor, a conveyor for removing substandard products, while recording an image of the tray using a video camera and/or a sensor for the presence of products and transmitting it to the machine vision controller that processes the image, simultaneously launching an algorithm for detecting markings on the found eggs by searching for an image of the marking on the top of the egg and detecting it as an object of a different color from the color of the egg, of a geometric shape; Based on image processing, the video camera controller generates several signals: the presence of an object in the camera, or a signal of under-insertion, or a signal of missing markings, or a signal of the presence of dirt, and the conveyor system controller receives these signals and, based on them, controls the pneumatic cylinder, with the help of which substandard products are sent to the discharge conveyor, and standard products are sent further along the conveyor for packaging.

The disadvantages of the prototype include the inability to detect defective products at high conveyor speeds and the inability to mark them for the purpose of removing them during subsequent technological operations in a static state.

The technical result is the elimination of the above-mentioned drawback, namely, ensuring the search and sorting of substandard products with the possibility of identifying and removing them from the batch at subsequent stages of the technological process.

This technical result is achieved in that the method for detecting substandard products on a moving belt is characterized by the fact that the products are moved on a conveyor through a detection system containing a lighting device 2, a video camera 3 connected to a machine (technical) vision controller that processes an image 4 obtained from the video camera 3, while the image is recorded by a computer 4, which processes the image and a display 5 for current control to visualize the products.

The novelty of the claimed proposal is that by processing the image of the product on a high-speed conveyor (speed 100-200 m/min) with the help of an illuminator 2 and a video camera 3, defective products 1 are identified and a mark 9 is applied to their surface by a contactless printing device 6 using an inkjet printing method, which makes it possible to identify defects at subsequent stages of the technological process, in a static state.

The essence of the invention is explained by drawings, where:

Fig. 1 - shows a structural diagram for detecting, registering and marking defective products on a moving conveyor, applying a control mark using inkjet printing;

Fig. 2 - marked defective product after cutting and stacking in a fan shape.

A device for detecting, recording, and marking defective products on a moving conveyor (Fig. 1) comprises: a light source 2 creating an illuminated field, a video camera 3, a computer 4 and a display 5 for ongoing monitoring, an inkjet printer 6, and contrast ink 7 used to create a control mark 9. The light source 2 is positioned above the product 1 moving along a high-speed conveyor 10, and the video camera 3 is positioned above the product and aimed at the product. The video camera 3, display 5 for ongoing monitoring, and inkjet printer 6 for printing a mark 9 on the detected defective product 8 are connected to the computer 4.

The device operates as follows (Fig. 1). The light source 2 forms an illuminated field on the moving web 10. The product, entering the illuminated field of the illuminator 2, the image of which is recorded by a video camera 3 and transmitted for processing to a trained computer 4 for defect recognition, for preliminary control the image is projected on a display 5, when a defective product 8 is detected, the computer 4 sends a signal to the printing device 6, which applies a mark 9 with contrast ink 7, by a contactless inkjet printing device 6, so that the marked defective product 1 can be easily identified in subsequent technological operations in a static state, for example, after cutting and stacking in a fan (Fig. 2).

Claims (1)

A system for automatic monitoring and marking of defective printed products, comprising a conveyor for moving the products to be monitored, a video camera located above the product and directed at the product, characterized in that it additionally contains a light source located above the product, creating an illuminated field, a computer trained to recognize defects, a current monitoring display for visualizing the products and an inkjet printer, the computer is connected to the video camera, the current monitoring display, and the inkjet printer, and is configured to receive images from the video camera, recognize defective products in the received images and transmit a signal to the inkjet printer for marking the defective product with a control mark, the conveyor is a high-speed conveyor with a movement speed of 100-200 m/min.