The introduction of intelligent servo-ELMO precision servos by Tianjin Luosheng has caused a lot of shock in the industry. The characteristics of ELMO servo: The patented control chip adopts the modern optimization control theory to realize the harmony and unity of function intelligence and ease of use. ELMO successfully configures all key parameters of various products into motion control and freely implements: current control, speed control, position control, and advanced position control. It challenges various application fields and occasions with precise motion and positioning functions, such as robotic semiconductor production, avionics, tool machine tools, packaging labels, wood processing, textiles, medical and pharmaceutical machinery, printing, mail sorting, material utilization, etc. industry.

Here's a brief introduction to the application of ELMO servo in the label printing equipment:

ElmO has implemented an ECAM-based solution using SaxoPhone and Mini-SaxoPhone digital servo motor drivers, successfully solving the problem of printing labels on irregularly spaced boxes on conveyor belts.

This application needs to take into account the speed of the box to be printed, the rotational speed of the label printing roller, and the distance between the two boxes. Therefore, an optical measuring device is installed on the front of the roller and on the belt side to catch the conveyed box and inform the roller to prepare the printed label. To this end, Elmo proposed a master-slave configuration scheme: the SaxoPhone digital servo motor driver is used as the master control device to control the conveyor belt, the label printing roller is the slave device, and is driven by the Mini-Saxonhone. The arrival information of the box is captured through a high-speed digital input port and sent to the slave device. After the roller receives the signal, it goes to the starting position. After the box comes over, printing starts. After the printing, the rollers are idle and uncontrolled until the next signal. Come here. One revolution of the roller can print two labels. Difficulties in the application are: during the actual work process, the boxes on the conveyor belt are usually at different intervals, and a mechanism is needed to control the movement of the rollers. In addition, the speed of the rollers needs to be synchronized with the speed of the conveyor belt, which requires each printing. Afterwards, the position of the roller should be adjusted so as to synchronize with the conveyor belt, and at the same time, the conveyor belt cannot lose synchronization.

ELMO Solution

In order to synchronize the belts and rollers, a programmable ECAM table was incorporated into the slave drive to serve as a reference for the positioning of the rollers. The ECAM table describes the non-linear movement trajectory of the roller to ensure that the rotation speed of the roller and the belt speed are exactly matched when the box reaches the printing area.

Record equipment movement track

This record in the figure shows the roller trajectory when a box arrives at the print area and two boxes reach the print area. The roller is divided into 32,000 scales and the printed area of ​​the label is in the 10,000-14,000 position.

When the signal is received, the roller accelerates from position 1 to position 2 and a label is printed on the box; position 3 indicates that the printing is complete. Then, the roller moves to position 4 and waits for the next box.