A set of writing performance monitoring device for developing pen products

Abstract

The application relates to a set of writing performance monitoring devices for developing pen products, comprising a writing circle instrument, characterized in that a crossbeam is arranged above the writing circle instrument, a plurality of cameras are arranged on the crossbeam, the camera video lines are connected with a visual controller, a shadowless lamp belt is arranged at the lower part of the crossbeam and is connected with the visual controller under the control of the visual controller, an encoder is arranged at the edge of standard writing paper of the writing circle instrument, the encoder roller is located on the standard writing paper, a distance sensor is arranged at the edge of the standard writing paper running table of the writing circle instrument, the output data of the encoder and the distance sensor are connected with a PLC host, and the PLC host is connected with the visual controller. The application has the advantages that the line image is collected, the image information is transmitted to the visual controller for line gray scale analysis and judgment, the qualified line length is accurately displayed, intelligent identification of line changes is realized, the unqualified line length and the number of times are displayed, and the writing end point is judged.

Description

Technical Field

[0001] This invention relates to a device for monitoring the writing performance of pen products. Background Technology

[0002] Pens are common household and school supplies, and writing performance (initial writing performance) is an important testing item. Currently, the equipment used to test this item in standards such as GB / T26714-2011 "Ink Ballpoint Pens and Refills" is a circular writing instrument / line marking instrument. However, this equipment is only a simple mechanical operation and line length counting display. Whether the line is smooth, whether it fades or breaks, all need to be observed and identified manually. This is not conducive to inspectors obtaining quantitative data to judge the test results intuitively. Moreover, when the marking paper runs out or the sample marking ends, the writing instrument cannot judge and further alarm or stop operation, thus causing test failure or waste of marking paper.

[0003] According to national or industry standards such as GB / T 26699-2011 "Ballpoint Pens for Examinations", GB / T 26714-2011 "Ink Ballpoint Pens and Refills", GB / T 32017-2019 "Water-based Ink Ballpoint Pens and Refills", GB / T 37853-2019 "Neutral Ink Ballpoint Pens and Refills", and QB / T 1655-2006 "Water-based Ballpoint Pens and Refills", the writing length test is conducted in conjunction with a writing circle tester to monitor and statistically calculate the line marks. The writing circle tester is an important pen writing performance testing device. It simulates the normal writing method of ballpoint pens, gel pens, etc., combining the pen refill's own revolution speed and paper feed speed to continuously draw a continuous spiral line on standard writing paper. The running time is recorded, the writing length is calculated, and the line quality is observed to evaluate the writing performance of pen products. It features multiple workstations, simple structure, and convenient operation. However, due to design principles and technical costs, the essence of the test is not the writing length, but the length calculated by the device's running time. When the line fades or breaks, the device cannot recognize and record it. When the line ends, the device cannot stop calculating the length and promptly notify the user. If the user does not record the writing length and turn off the device in time, the accurate writing length cannot be obtained, resulting in test failure and waste of standard writing paper. Summary of the Invention

[0004] This invention addresses the problem in existing writing circle measuring instruments that cannot intelligently determine the line drawing situation when testing the writing function of pen tips, and provides a device for monitoring the writing performance of pen products. This invention designs and develops a writing performance monitoring device for pen products, including a writing circle measuring instrument. The device is characterized by having columns on both sides of the instrument, with a crossbeam connecting the tops of the columns. Several cameras are mounted on the crossbeam, and the camera video cables are connected to a vision controller. A shadowless light strip is installed under the crossbeam, controlled and connected by the vision controller. An encoder is installed on the edge of the standard writing paper of the writing circle measuring instrument, with the encoder roller located on the standard writing paper. A distance sensor is installed on the edge of the standard writing paper's running surface. The output data from the encoder and the distance sensor are connected to a PLC host, which is connected to the vision controller. Each camera lens corresponds to one or two writing positions of the writing circle measuring instrument. The light irradiation surface of the shadowless light strip under the crossbeam corresponds to the writing position of the writing circle measuring instrument. A base beam is installed at the bottom of the columns on both sides of the writing circle measuring instrument.

[0005] The camera assembly and the long, strip-shaped shadowless light strip are fixed to the crossbeam. The crossbeam height / camera height, camera angle, and light source angle can be adjusted using fastening bolts to accommodate different brands or models of writing circlers. Multiple screws are installed at the bottom of the columns on both sides of the writing circler for non-destructive fastening to the main unit, preventing relative vibration between the monitoring device and the writing circler. The advantages of this invention are: by placing a visual acquisition camera above the writing position, optical monitoring of the tracing image is performed. The data is transmitted to the visual controller for tracing quality evaluation, and the results are transmitted to the PLC for data accumulation, calculation, and display. The encoder and distance sensor calculate the running length, and the data is transmitted to the PLC for statistical calculation. Combined with the qualified tracing results obtained from optical monitoring, the qualified tracing length is accurately displayed, and intelligent recognition of line changes and determination of the writing endpoint are achieved. Attached Figure Description

[0006] Figure 1 This is a schematic diagram showing the combination of the various functional modules and the data / signal flow of the present invention.

[0007] Figure 2 This is a schematic diagram of the structure of the present invention. Implementation

[0008] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative and not intended to limit the scope of the invention.

[0009] The figure shows a device for monitoring the writing performance of pen products, including a writing circler 1. Its features include columns 2 on both sides of the writing circler, with a crossbeam 3 connecting the tops of the columns. Several cameras 4 are mounted on the crossbeam, and the video cables of the cameras are connected to a vision controller (not shown in the figure). A shadowless light strip 5 is located under the crossbeam, controlled and connected by the vision controller. An encoder 7 is located on the edge of the standard writing paper 6 of the writing circler, with the encoder roller 8 positioned on the standard writing paper. A distance sensor 10 is located on the edge of the standard writing paper running surface 9 of the writing circler. The output data from the encoder and the distance sensor are connected to a PLC (Programmable Logic Controller) host (not shown in the figure), which is connected to the vision controller. Each camera lens corresponds to one or two writing positions 11 of the writing circler. The light irradiation surface of the shadowless light strip under the crossbeam corresponds to the writing position of the writing circler. A base beam 12 is located at the bottom of the columns on both sides of the writing circler.

[0010] The specific uprights and crossbeams adopt a portal frame structure. The uprights are inverted T-shaped brackets (or a structural frame that can achieve the same function). The uprights on both sides are connected by the crossbeams. Both the uprights and crossbeams are metal parts with grooved structures. They are connected by connectors 13. The height of the crossbeam / camera height, camera angle, and light source angle can be adjusted by loosening or tightening the bolts and nuts 14, thus adapting to different brands or models of writing circle instruments. The base beam of the uprights is securely fastened to the writing circle instrument main unit without damage using multiple screws 15. Except for the camera data cable, the power cable (control cable) of the light strip is connected to the vision controller.

[0011] The writing circle drawing device is an existing piece of equipment. Here's a brief introduction: The main unit has a frame that holds the samples (writing pens, usually multiple, e.g., 10 pens for simultaneous testing at 10 stations), which remains stationary. The upper part of the main unit has a moving component, including a standard writing paper running platform and a roll of fixed writing paper. The moving component causes the writing paper to move in two ways: first, it moves along the flat surface to draw a horizontal circle in the plane; second, the paper continues to move longitudinally, so what is actually drawn is a continuous spiral line.

[0012] A camera is installed to photograph the location of the handwriting. Each time a distance sensor sends a counting signal via PLC to the vision controller, the vision controller instructs the camera to take a picture of the line image. This image is then sent to the vision controller for analysis to confirm whether the line is a valid mark. The number of cameras can be increased or decreased depending on the number of workstations (currently, the actual device can monitor one or two workstations with one camera). The recognized data is transmitted to the PLC.

[0013] The encoder is fixed on the standard writing paper running table. The soft rubber roller presses the standard writing paper onto the standard writing paper running table. As the paper moves, the encoder's soft rubber roller rotates synchronously with the paper, thereby calculating the longitudinal movement speed of the paper, and the data is transmitted to the PLC.

[0014] The distance sensor is fixed to the side of the standard writing paper running table, where the main unit is stationary. Every time the standard writing paper running table moves close to the sensor, it records a signal and transmits it to the PLC. After receiving the signal, the PLC sends a signal to the vision controller to activate the camera to take a picture.

[0015] The length of the repeating segments can be calculated by measuring the diameter and spacing of the repeating segments, or it can be manually input into the PLC. The distance sensor can count the number of cycles per unit time; multiplying the number of cycles per unit time by the length of the repeating segments gives the writing speed per unit time.

[0016] The writing speed is displayed on the PLC host screen. Simultaneously, the PLC judges the captured lines according to the set grayscale value requirements. Lines meeting the grayscale requirements (sufficiently dark, indicating normal writing) are considered acceptable. Lines below the grayscale threshold are judged as shallow or broken. Consecutive lines below the grayscale threshold are considered a single broken line segment. Finally, the PLC calculates the actual (acceptable) writing line cycle count, multiplying it by the length of the repeated line segment to obtain the actual effective writing length. This length is then used as the test result and evaluated according to standard requirements. The PLC also records the number of shallow or broken lines and the total length as reference test results. In actual testing, a reasonable grayscale threshold should be set according to the writing color of the different pens.

[0017] A visual acquisition camera is installed above the writing position to optically monitor the line drawing image. The data is transmitted to a vision controller for line drawing quality evaluation, and the results are transmitted to a PLC for data accumulation, calculation, and display. An encoder and distance sensor calculate the running length, and the data is transmitted to the PLC for statistical analysis and calculation. Combined with the qualified line drawing results obtained from optical monitoring, the system accurately displays the qualified line length and intelligently identifies line changes and determines the writing endpoint.

Claims

1. A device for monitoring the writing performance of pens, comprising a writing circle measuring instrument. The main unit of the writing circle measuring instrument has a frame for fixing the writing pen; the frame remains stationary. The upper part of the main unit has a moving component, including a standard writing paper running platform for holding standard writing paper and a roll of standard writing paper fixed thereon. The moving component causes the standard writing paper to move in two ways: first, it moves horizontally along the flat surface to draw a circle in the plane; second, the paper continues to move longitudinally, so the actual drawn line is a continuous spiral. The device is characterized by... The writing circle marker has columns on both sides, with a crossbeam connecting the tops of the columns. Several cameras are mounted on the crossbeam, and the video cables from the cameras are connected to a vision controller. A shadowless light strip is installed under the crossbeam, controlled by the vision controller. An encoder is mounted on the edge of the standard writing paper, fixed to the standard writing paper's running surface. The encoder's soft rubber rollers press the standard writing paper against the running surface. As the paper moves, the encoder's soft rubber rollers rotate synchronously, calculating the paper's longitudinal speed. This data is transmitted to the PLC. A distance sensor is also located on the edge of the standard writing paper's running surface. Each time the running surface moves close to the distance sensor, a signal is recorded. The signal is transmitted to the PLC. The PLC host is connected to the vision controller. After receiving the signal, the PLC sends a signal to the vision controller to activate the camera to take pictures. Each camera lens corresponds to one or two writing stations of the writing circler. The light irradiation surface of the shadowless lamp strip set under the crossbeam corresponds to the writing station of the writing circler. The bottom beam is set at the bottom of the columns set on both sides of the writing circler. The PLC judges the line obtained by the picture according to the set gray value requirements. If it meets the gray value requirements, it is counted as a qualified line. If it is lower than the gray value threshold, it is judged as a line that is too light or broken. Continuous lines that are lower than the gray value threshold are counted as a broken line. Finally, the PLC calculates the number of cycles of qualified writing lines, multiplied by the length of the repeated line segment, which is the actual effective writing length.

Images