Application of Yaskawa MP2300 Motion Control System to Intermittent Printing Machine2016-10-28
Since the invention of movable type printing, printing technology has experienced thousands of years of development, has become more mature. But with the continuous development of industrial control technology, printing press control technology is also continuing to progress, more and more to the digital development. The use of automatic control system makes complex printing process becomes simple and accurate, and more and more mechanical parts are replaced by electrical systems.
The following will introduce the Yaskawa motion control system in the shaftless intermittent printing presses on the application.
1 shows a schematic view of a shaftless intermittent printing press.
Printing Schematic
Figure 1 Schematic diagram of a shaftless intermittent printing press
Figure 2 printing shaft and the action between the drag axis
The relationship between the printing axis and the drag axis is shown in Fig. Each printing shaft has no transmission screw connection, and each printing machine runs independently. Due to the limitation of the length of the printing template, printing can not be carried out at full speed. When the printing plate touches the paper (Fig.2a) The printing axes are equal in speed (Fig. 2b) and the printing is done in the same direction. When the printing operation is finished (Fig. 2c), that is, when the paper and the printing plate are disengaged, the paper starts to decelerate and stop for a distance in the opposite direction (Fig. 2d). When the printing plate is contacted with the paper again to start printing, the paper is kept in the same direction as the printing drum linear speed so that the printing shaft and the paper are kept in synchronous relation when the printing plate comes into contact with the paper. When the printing shaft is disengaged from the paper, During the retracting operation, the two traversing axes are always synchronized with the retraction during the whole operation. By reversing the paper in the printing of the blank axis of the printing plate, adjacent printing patterns can be precisely arranged, saving the paper, so the semi-rotary printing in some narrow-width printing on the application is very common.
Electrical principle
The electrical system used in such presses. First of all, there is no mechanical connection between the printing shafts due to the use of shaftless printing. Therefore, a high-precision synchronous operation between a plurality of printing shafts can be ensured, thereby ensuring accurate color registration between a plurality of colors. Second, due to intermittent printing action, not only to synchronize the two spindles run, but also according to the location of the printing spindle for the forward and backward movement, which requires the host controller has high-speed and complex computing power. Ordinary PLC has been difficult to achieve such a requirement, in addition, to ensure that the press can be high-speed, high efficiency, high responsiveness of the motor is also essential.
In this case,
Figure 3 system structure
System structure shown in Figure 3. In this system, as the host computer Yasukawa MP2300 motion controller is a set of multiple functions in one high-speed high-performance controller, can control up to 48 axes, according to the specific requirements of different control modules to achieve a variety of Features. It also has communication functions such as RS232, RS485, RS422, Ethernet, DeviceNet, Profibus and other communication protocols, and can be used for positioning, constant speed feed, interpolation, torque control and phase control. In addition, also has the function of sending pulse and analog signal. In addition, the MP2300 can also receive external encoder signals for counting. For a two-speed spindle with complex motion, Yaskawa's highly responsive servomotors are fully responsive and have a high response frequency. Can reach 5000r / min.
Yachawa MP2300 motion controller uses MECHATROLINK-Ⅱ high-speed field bus (communication speed is 10Mbps) to communicate with each axis servo motor in the communication of each electrical equipment. Thus greatly reducing the communication lines, to achieve a standardized connection, but also reduces the possibility of interference. Through the RS232 / RS485 connection touch screen as the man-machine contact surface, through RS232 / Ethernet and so on carries on the correspondence with the position machine. The motion and logical operation of the whole system are finished by the MP2300 motion controller. The programming of the program is done in the host computer by the MP2300 programming software MPE720. The programming language is similar to the PLC ladder language. In addition, MP2300 also has a text language program editor - the movement program and function calls and other functions, various forms of programming language can greatly facilitate the realization of complex functions.
solution
First of all, in order to maintain synchronization between the various colors of the printing axis, in the Yasukawa MP2300 controller, the use of electronic axis function, no mechanical shaft to achieve non-axis synchronous operation. The electronic axis function is a kind of speed control function with position compensation in YASKAWA MP2000 series controller. YASKAWA famous pencil lead test (two servomotors are relative high speed acceleration and deceleration, 0.5mm pencil lead connection in the middle The pencil core does not break during operation) is to use the electronic axis function. However, in the printing process, due to the scalability of the paper is very large, the absolute axis of the printing axis is often printed out of the pattern will be dislocation, the traditional solution is for mechanical fine-tuning, MP2300 motion controller is now using the position compensation Function, just enter the compensation value in the host computer, you can register between the printing axis operations, greatly simplifying the operation, to achieve intelligent.
Second, because the printing press intermittent printing, so the two dragging axis for the forward, backward and then move forward, in the process, not only in the process of dragging the printing axis in the same time with the printing plate synchronous operation, but also according to the printing spindle Position for cam operation, the MP2300 controller uses the electronic cam function, that is, according to the location of the printing spindle for any specified trajectory of the operation.
As shown in Figure 4: the printing axis of a revolution is set to a cycle, that is, 360 °, in the MP2300 program editing, you can assume that the specified 0-x-degree dragging shaft from 0r / min speed to the printing spindle Speed, xy degrees (specific length according to the length of the printing plate to set), dragging the dragging axis of paper and printing axis synchronous printing, yz degrees deceleration stop, z-360 degrees dragging the axis back a certain distance, so And then the next printing cycle. So the drag axis can not only ensure that the printing plate contact printing speed and printing plate synchronization, you can also print the spindle running to a specified position for the return action, there will not be paper and printing plate position deviation, to avoid the printing axis drag Paper phenomenon. These work now only need to complete MP2300 motion controller, eliminating the need for traditional mechanical cam mechanism and phase proofing mechanism.
Figure 4, the relationship between the drag axis and the printing spindle
As the two trailers are used electronic cam function, and electronic cam function has a special speed compensation parameters, so before and after the drag between the feed axis to set a certain speed compensation difference, you can make the two between the feeder axis of the paper Always in a tight state, so as to better ensure the effect of printing.
In addition, the various functions on the press, can be completed in the MP2300 motion controller. Before the printing needs of the tightening of the paper and ink technology, in the past need to manually adjust the mechanical and ink motor to complete, and now can be completed by the Yaskawa servo motor, do not need to set up a separate ink motor and mechanical adjustment. In the traditional intermittent printing machine work in the process of delivery and release paper speed as the reciprocating paper feed is difficult to be uniform, due to the MP2300 on the collection, put paper motor also carried out communication and control, so through the controller The establishment of the program, you can follow the changes in the printing speed to achieve uniform income, put paper, retractable paper volume greatly improved, to avoid the mechanical body of the cardboard phenomenon.
The system should be run at high speed, especially the traverse axis to complete high-speed, high precision reciprocating motion, the PC's processing power, servo motor response and the system's internal communication rate has a very high demand. I selected the Yasukawa MP2300 motion controller, Yasukawa high response servo motor and MECHARTROLINK-Ⅱ field bus are well to meet these requirements.
Conclusion
The Yaskawa motion control system uses an axle-less intermittent printer, which eliminates the need for a mechanical drive and calibration section compared to previous shaft presses, enabling independent control of the print axes, Type printing of the accuracy has been greatly improved. A variety of functions to achieve integrated and intelligent control. With the improvement and improvement of Yaskawa motion control system, it is believed that its application in the printing industry will be more extensive and in-depth.
