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     Servo positioning precision curved screen printer is a screen printing device that tracks colors on the cylindrical surface and controls the position of the second color starting point. It is often used as a screen printer for various products without positioning points in the circumferential direction of the cylinder for color registration:

Working principle

    The screen descends to contact the substrate, the photoelectric sensor tracks the set color signal and transmits it to the PLC and controls the servo motor to rotate to the set color position for second color printing, realizing the color registration relationship of the two colors.

Structural composition

• Mechanical transmission system: including servo motors, gear racks, pulleys and other components, responsible for driving the precise rotation of the cylindrical substrate and the smooth movement of the printing plate, ensuring the synchronization and accuracy of each component during the printing process.

• Printing system: including screen lifting system, ink scraper and ink return knife printing action. The screen lifting and ink scraper and ink return knife actions are precisely controlled by linear guides.

• Positioning system: through photoelectric sensors, encoders and other detection elements, the cylinder is accurately positioned to ensure the position accuracy of the printed pattern on the cylinder.
The servo color tracking and positioning system is mainly composed of the following parts:

1 ）Color acquisition module: Usually a photoelectric sensor is used, which is installed in a suitable position to obtain the color information of the cylinder surface. Attention should be paid to the light conditions and angle selection to ensure the image clarity and color recognition, and provide an accurate basis for subsequent processing.
2 ）Image processing and analysis module: The collected image is processed, and the position and angle of the color mark and other information are identified through edge detection, color segmentation, morphological processing and other methods. Then this information is converted into coordinate and angle data that can be recognized by the servo system.
3） Servo drive and control module: According to the information transmitted by the image processing module, the servo driver sends a corresponding control signal to the servo motor to realize the tracking and positioning of the color mark and ensure the accuracy of related operations. Among them, the encoder will monitor the position and speed of the motor in real time and feed it back to the driver to form a closed-loop control and improve positioning accuracy. Color marking: As a positioning reference, it is necessary to have a specific color and shape that contrasts sharply with the color of the cylinder surface, and remain clearly identifiable during the rotation and translation of the cylinder, so that the image acquisition module can accurately identify it.

• Control system: PLC or single-chip microcomputer is usually used as the core controller, responsible for coordinating the actions of various components, such as controlling the printing speed, the rotation angle of the substrate, the moving distance of the printing plate, etc., and also has fault diagnosis and alarm functions.

Application field

     It is widely used in the cosmetics, food, beverage, medicine and other industries, such as the printing of cosmetic bottles, beverage bottles, pill tubes and other products, and can also be used in stationery, gifts, crafts and other industries, such as pen holders, gift boxes, craft ornaments and other cylindrical items for decorative printing.