Application advantages of motion control technology in printing / labeling

Now, the electronic gears are coupled together through the controller, thus eliminating the mechanical dependence fundamentally. It can be seen in the labeling industry that open-loop stepper motors and drives are gradually being replaced by closed-loop position servo drives and motors, thereby eliminating possible stepping motor stepping losses or position inaccuracies. With the development of electronic gear and servo technology, as a system, the entire motion control platform has been greatly improved.

Today's motion control systems provide packaging machine manufacturers with many functions and improvements. Now, through the combination of controller, servo drive and motor, a more stable system can be provided, which makes the machine perform better in terms of accuracy and speed, with higher output per unit time, longer available time, and shorter manufacturing time. Less maintenance and easier troubleshooting.

As an integral part of the system, digital networks are common on many current controllers. Compared with the drive analog command interface of traditional controllers, these digital networks are usually Ethernet based on the communication protocol, used for deterministic data exchange between the controller and the servo drive, and run synchronously at a microsecond rate to realize the drive Real-time access to I / O and drive parameters. Be aware that these I / O and parameters are changing rapidly while the machine is running. Because the number of interface cables is reduced, it is actually a plug-and-play network using standard Ethernet CAT5E shielded cables, so its noise resistance is better than that of analog systems. This feature also facilitates the placement of the drive in the most suitable location around the machine, as well as the modularization of the machine, and allows manufacturers to add options to the basic machine without any interface problems. In short, digital networks have great advantages over analog networks.

Printing machines and labeling machines are very similar, with several material unwinding stations and one or two rewinding stations. The materials such as paper or plastic are unwound and distributed from the drum to the machine, or come out of the machine and rewinded onto the drum. The diameter of the drum is continuously increasing or decreasing. As the diameter changes, the inertia of the drum also changes. The fluctuation of the inertia produces different servo loop adjustment values ​​at different diameters to prevent loop instability. In a simulated system, it may not be possible to change this parameter while the machine is running. But in the digital network system, these values ​​can be accessed and changed through the controller to control the dynamically changing machine in real time.

Due to the need for digital communication with the controller, the driver must also be more intelligent than the controller. Now, many drivers are manufactured using DSP (Digital Signal Processing) technology, which is superior to old-fashioned drive technology in terms of speed and processing performance. Most of today's servo drives also have built-in safety circuits, so the drives and controllers can be easily integrated into the machine's safety logic system.

Although the base of the servo motor is small, the output torque is not small, and the direct drive motor can be directly connected to a load such as a printing cylinder, and no longer requires the gearbox and other mechanical mechanisms required by the traditional pulley system. As the entire control system improves the production capacity of the machine, it also requires other non-motion operations to be improved accordingly, such as other devices connected to the machine, as well as the workshop or enterprise activities and management where the machine is located.

To this end, Ethernet TCPIP communication is embedded in many control systems to integrate the device into control systems such as I / O, vision systems, RFID readers, bar code scanners, and robots, and to communicate with other control platforms, PCs , OPC client, SCADA system to exchange data.

For design engineers, this systematic approach is a welcome improvement. Since motion control suppliers can generally provide a comprehensive product line, design engineers can now rely on one manufacturer to design machines without choosing many different suppliers. Each supplier is responsible for part of the design and then spends a lot of time and effort Put all the pieces together. Design engineers can focus on design issues without worrying about solving any interface problems. This also reduces the number of suppliers and repeat orders. The advantages of this are obvious-in the machine assembly shop, the components can be seamlessly connected. Because the machine is easy to debug and troubleshoot, the technical service level has also been improved accordingly.

Therefore, the motion control system is your best choice.

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