Optimization Design Of The Head Carriage System Of Certificate Printer

There are many kinds of certificates in various industries at home and abroad.In the past,the content of the certificates is mainly handwritten which costs huge workload and is not easy to identify.With the development of printer technology,the content in these certificates can be printed out through the printer,which greatly improves the accuracy and efficiency.Considering all these certificates have the characteristics of hard cover and are rather thick,it is difficult for general laser printer or inkjet printer to complete the printing task,so the content on the certificate is printed by the certificate printer.With the development of Internet technology and information technology,the use of self-service terminal is more and more widely,and the certificate printer is also widely used in self-service terminal.With the increasing use of certificate printers,there are some problems in the market.One of the typical problems is printing dislocation.This paper is mainly based on the principle of the certificate printer head carriage system,combined with the stepper motor dynamic equation,to achieve the optimization of the word car system,so as to solve the printing dislocation problem,the main research content is as follows:This paper expounds the overall scheme design of the certificate printer,and introduces the core module of the print head,the paper feeding system and the head carriage system.Through the analysis of the specific character printing process,this paper explains the printing dislocation problem caused by the step motor out of step in the head carriage system,and through the step motor dynamic equation,determines the two research directions to solve the step motor out of step,that is to optimize the step motor acceleration control and load lightweight design.According to the acceleration control table of the stepper motor in the head carriage system of a certain type of certificate printer,the mathematical model for calculating the angular acceleration and angular velocity of the stepper motor in the starting process is given,and the angular acceleration and angular velocity of the motor in the acceleration process are formed into a visual chart.According to the calculated angular acceleration,angular velocity value and visual chart,the existing problems of acceleration control are pointed out.Based on the proposed calculation model,the new angular acceleration function,angular velocity function and angular function are given to form the optimized angular acceleration curve,angular velocity curve and angular curve.The angular curve is discretized to make the optimized acceleration control schedule of stepping motor.By comparing and analyzing the acceleration control before and after optimization,it is found that the peak value of angular acceleration is reduced by 77%,the total time of acceleration phase is reduced by 5.33%,and the rotation angle of stepping motor is reduced by 11.11%.The whole angular acceleration curve has no obvious peak value and the curve is smooth,which greatly improves the acceleration control of stepping motor.According to the results of optimization design,the product was improved and the product performance was evaluated in two rounds.Ten machines were selected in the first round and 50 machines were selected in the second round.Before the optimization of stepping motor acceleration control,there was printing dislocation in two batches,but after the optimization of acceleration control,there was no printing dislocation in two batches.The optimized scheme of acceleration control is applied to the user who feeds back the printing dislocation problem.The user has successively purchased about 300 machines.So far,the longest service time of the machine is about 10 months,and the printing dislocation problem has not been fed back.Therefore,the printing dislocation problem of the product has been basically solved.The finite element analysis model of the head carriage system of the certificate printer is established.According to the different positions of the head carriage,the static analysis,dynamic analysis and harmonic response analysis of the head carriage system are carried out,and the first six natural frequencies,vibration modes and displacement responses of the printing head in each mode of the head carriage system are obtained.On this basis,the paper optimizes the topology of the head carriage system of the current certificate printer,and reduces the weight of the head carriage by 12.5%.Before and after the topology optimization and the stepping motor acceleration control are compared and analyzed.It is found that after topology optimization and stepping motor acceleration control optimization,when the head carriage is at the left end,the x-direction displacement response of the observation point of the print head decreases by 91.6%,the y-direction displacement response of the observation point of the print head decreases by 92.1%,and the z-direction displacement response of the observation point of the print head decreases by 92.3%.When the head carriage is in the middle,the x-direction displacement response of the print head observation point is reduced by92.4%,the y-direction displacement response of the print head observation point is reduced by 93.7%,and the z-direction displacement response of the print head observation point is reduced by 92.5%.Through comparative analysis,it is found that the stiffness of the optimized system has been greatly improved.