JP-2026074837-A - Dot marking and printing system and method of use thereof

JP2026074837AJP 2026074837 AJP2026074837 AJP 2026074837AJP-2026074837-A

Abstract

[Problem] To provide a dot-shaped marking and printing system and a method of using the same that can prevent nozzle clogging of the discharge nozzle. [Solution] The dot marking and printing system 60 comprises a dot marking and printing device 1 equipped with a paint chamber 2, a discharge control valve 22, a discharge nozzle 11, a cleaning agent passage 3, and a cleaning agent flow path 30, and a compressed air pipe 80 capable of supplying compressed air, a cleaning air solenoid valve 73, a paint pipe 81 for pressurizing the paint, a paint supply stop solenoid valve 71, a cleaning agent pipe 84 for pressurizing the cleaning agent 5, a cleaning solenoid valve 74, a pressure reducing device 62, and a pressure reducing device pipe 83. After filling the cleaning agent passage 3 and the cleaning agent flow path 30 with cleaning agent 5, the pressure reducing device 62 is activated to reduce the pressure inside the paint chamber 2 of the dot marking and printing device 1, and the discharge control valve 22 is opened 1 to 10 times to draw in and maintain the cleaning agent 5 in the paint flow path 32, which is inside the discharge nozzle 11. [Selection Diagram] Figure 3

Inventors

松本謙二

Assignees

マークテック株式会社

Dates

Publication Date: 20260507
Application Date: 20241021

Claims (6)

A dot marking and printing system comprising a dot marking and printing device equipped with a discharge nozzle for dispensing paint, a paint chamber, a cleaning agent passage, and a cleaning agent flow path, wherein the paint chamber is equipped with a discharge control valve consisting of a valve seat and a valve body, The aforementioned dot marking and printing system further includes a pressure reducing device and pressure reducing device piping. The paint chamber of the dot marking and printing device and the pressure reducing device are connected at least by the pressure reducing device piping. The dot marking and printing system is characterized in that the pressure reducing device is capable of reducing the pressure applied to the paint in the paint chamber to below atmospheric pressure.
A dot marking and printing device comprising a discharge nozzle for dispensing paint, a paint chamber, a cleaning agent passage, and a cleaning agent flow path, wherein the paint chamber is equipped with a discharge control valve consisting of a valve seat and a valve body, A compressed air supply source, compressed air piping connecting the compressed air supply source and the dot marking and printing device, and a cleaning air solenoid valve provided in the compressed air piping, A pressure reducing device, pressure reducing device piping connecting the pressure reducing device and the dot marking and printing device, paint circulation piping connecting the dot marking and printing device and the paint tank for circulating the paint, and a circulation solenoid valve provided in the paint circulation piping, The paint tank, paint piping connecting the paint tank and the dot marking and printing device for supplying the paint to the dot marking and printing device, a paint pump for pressurizing the paint in the paint piping, and a paint supply stop solenoid valve provided in the paint piping, A dot marking and printing system characterized by comprising a cleaning agent supply source, cleaning agent piping connecting the cleaning agent supply source and the dot marking and printing device for supplying the cleaning agent to the dot marking and printing device, and a cleaning solenoid valve provided in the cleaning agent piping.
A method for using the dot marking and printing system according to claim 2, A cleaning agent supply step for supplying the cleaning agent to the dot marking and printing device, The system includes a depressurization step for reducing the pressure in the paint chamber, The aforementioned detergent supply step and the aforementioned depressurization step are carried out sequentially. The cleaning agent supply step is a step of opening the cleaning solenoid valve, closing the cleaning air solenoid valve, opening the circulation solenoid valve, and closing the paint supply stop solenoid valve. A method for using a dot-shaped marking and printing system, characterized in that the depressurization step is a step of opening the discharge control valve for a certain period of time, a step of closing the cleaning solenoid valve, the cleaning air solenoid valve, the circulation solenoid valve, and the paint supply stop solenoid valve, and a step of operating the depressurization device to reduce the pressure of the paint in the paint chamber to a pressure lower than atmospheric pressure, all performed simultaneously.
The method of using the aforementioned dot marking and printing system further comprises a compressed air introduction step, The compressed air introduction step is a step of opening the cleaning air solenoid valve and closing the cleaning solenoid valve, the circulation solenoid valve, and the paint supply stop solenoid valve. The method for using the dot marking and printing system according to claim 3, characterized in that the cleaning agent supply step, the compressed air introduction step, and the depressurization step are carried out in order.
The method for using the dot-shaped marking and printing system according to claim 3 or 4, characterized in that the depressurization step comprises a step of repeatedly opening and immediately closing the discharge control valve one to ten times, instead of the step of keeping the discharge control valve open for a certain period of time.
A dot marking and printing device comprising a discharge nozzle for dispensing paint, a paint chamber, a cleaning agent passage, and a cleaning agent flow path, wherein the paint chamber is equipped with a discharge control valve consisting of a valve seat and a valve body, A compressed air supply source, compressed air piping connecting the compressed air supply source and the dot marking and printing device, and a cleaning air solenoid valve provided in the compressed air piping, A pressure reducing device, and pressure reducing device piping connecting the pressure reducing device and the dot-shaped marking and printing device, A paint tank, a paint piping connecting the paint tank and the dot marking and printing device for supplying the paint to the dot marking and printing device, a paint pump for pressurizing the paint in the paint piping, and a paint supply stop solenoid valve provided in the paint piping. A method for using a dot marking and printing system comprising a cleaning agent supply source, cleaning agent piping connecting the cleaning agent supply source and the dot marking and printing device for supplying the cleaning agent to the dot marking and printing device, and a cleaning solenoid valve provided in the cleaning agent piping, The aforementioned paint is an ink, The method of using the dot marking and printing system is as follows: A pressure relief step to return the pressure inside the paint chamber to near atmospheric pressure, A second cleaning agent supply step for introducing the aforementioned cleaning agent, It is equipped with a second depressurization step, The pressure release step, the second detergent supply step, and the second depressurization step are carried out in order. The pressure relief process involves simultaneously opening the discharge control valve 1 to 10 times, closing the cleaning solenoid valve, closing the cleaning air solenoid valve, and closing the paint supply stop solenoid valve. The second cleaning agent supply step is a step of opening the cleaning solenoid valve and closing the cleaning air solenoid valve and the paint supply stop solenoid valve, A method for using a dot-shaped marking and printing system, characterized in that the second depressurization step is a step of closing the cleaning solenoid valve, the cleaning air solenoid valve, and the paint supply stop solenoid valve, and activating the depressurization device to reduce the pressure of the paint chamber to a pressure lower than atmospheric pressure.

Description

This invention relates to a dot marking and printing apparatus for printing dot patterns on products such as steel materials. Conventionally, dot marking and printing devices used in this type of dot marking and printing system have a discharge nozzle suitable for dot printing at its tip, and a discharge control valve consisting of a valve seat and a spherical valve body is known to be formed inside this discharge nozzle. This spherical valve body is integrally connected via a rod to the movable iron core of a vibration mechanism, such as an electromagnetic solenoid. A paint chamber filled with pressurized paint is provided around the valve seat and spherical valve body. The discharge control valve opens and closes due to the reciprocating motion of the movable iron core, and dot-shaped liquid paint is intermittently discharged from the discharge nozzle. If the paint is left unattended, it will harden due to drying and clog the nozzle. Therefore, conventionally, in order to prevent the paint inside the discharge nozzle from hardening, it was necessary to take measures to prevent paint hardening inside the nozzle by periodically cleaning the area around the discharge nozzle with a cleaning agent or by periodically spraying paint to remove any excess paint. However, simply filling the area around the discharge nozzle with cleaning agent was insufficient to prevent paint solidification inside the nozzle. Furthermore, periodic blow-drying was required, resulting in wasted paint. Additionally, blow-drying was impossible if the dot marking and printing device itself was powered off, making paint solidification impossible. For example, Patent Document 1 discloses a method for using a dot-shaped marking and printing mechanism, which includes a detergent introduction step of filling a detergent holding nozzle with the detergent by introducing the detergent into the detergent holding nozzle, a detergent discharge step of repeating the step of discharging the detergent that has filled the detergent holding nozzle from a detergent discharge port by introducing air into the detergent holding nozzle once or more times, and a foam generation step of introducing a small flow rate of air into the detergent holding nozzle. The technology described in Patent Document 1 is superior in that it can clean the spray surface by utilizing a small flow rate of air. However, the dot-shaped marking and printing mechanism and method of use disclosed in Patent Document 1 still have a problem in that it does not prevent the paint from solidifying inside the discharge nozzle. Therefore, methods to easily prevent paint solidification within the discharge nozzle, and methods that eliminate the need for periodic blow-by spraying to prevent paint solidification within the discharge nozzle, were being considered. Japanese Patent Publication No. 2024-83067 This is a schematic cross-sectional view showing an example of a dot-shaped marking and printing device 1 according to this embodiment.This is an explanatory diagram showing a cross-section of the nozzle plate 10 and discharge nozzle 11 of the dot marking and printing device 1 of the present invention, with the interior exposed.This figure shows the piping of the dot marking and printing system 60 according to this embodiment.This is a process diagram showing a method 90 for using the dot-shaped marking and printing system 60 according to this embodiment.This diagram shows the internal state of the dot marking and printing device 1 when the usage method 90 of the dot marking and printing system according to this embodiment is performed, with (X) being the state after the printing process, (Y) being the state after the cleaning agent supply process 91 in the usage method 90, and (Z) being the state when the depressurization process 92 is being performed in the usage method 90.The diagram shows the internal state of the dot marking and printing device 1 when the usage method 90 of the dot marking and printing system according to this embodiment is performed, where (X) is a diagram showing the state when the discharge control valve 22 is closed during the depressurization process 92 in the usage method 90, (Y) is a diagram showing the state when the air process 93 is performed in the usage method 90, and (Z) is an explanatory diagram showing the state after the waste blowing process 94 is performed in the usage method 90.This is a process diagram showing another example of how to use the dot marking and printing system 60 according to this embodiment, namely method 100.The diagram shows the internal state of the dot marking and printing device 1 when the method of use 100 of the dot marking and printing system according to this embodiment is performed, where (X) is an explanatory diagram showing the state after the compressed air introduction step 95 of the method of use 100 is performed, and (Y) is an explanatory diagram showing the state after the depressurization step 92 of the method of use 1