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The hot-press fusing process of a laser printer is one of the principal causes for paper folding and bending deformation. In order to predict and control the deformation of paper, first, the following analysis method is proposed for the transient temperature field analysis of the continuous moving paper: discretizing the thermal analysis process, replacing the moving paper model with the moving heat source, and simulating the movement speed of paper by setting the flow boundary conditions. Second, taking the steady-state thermal calculation results of the printer in the standby mode as initial conditions, the temperature distribution characteristics of paper during the movement are obtained with the paper model placed in a whole-machine environment to analyze the transient temperature field. Third, using the method of multi-field coupling, the transient temperature field results of paper are taken as the external load of its static analysis to analyze the deformation of paper during the fusing process; therefore, the quantitative deformation results and deformation characteristics of paper after fusing are obtained. According to the results, more precise boundary conditions can be achieved by calculating the temperature field of paper in a whole-machine environment. The method of transient temperature field analysis for continuous moving objects proposed in this study can effectively simulate the movement process of paper. The results reveal the mechanism of paper wrinkle and bending deformation in the fusing process, which can be used to predict the conveying performance of paper and guide the design work of the printer.

Taking the printer heat-roller as the research object, the static characteristics and sensitivity were analyzed by finite element method. Through static analysis, the static characteristics of the heat-roller under working load were obtained, and the size parameters which have great influence on the static characteristics of the structure were determined by sensitivity analysis. The heat-roller was optimized to reduce the self-weight of the structure. It is concluded that the maximum working stress of heat-roller under working load is less than the allowable stress of material, and the structural dimension meets the strength requirement. According to the sensitivity analysis results, it can be seen that the structural parameters which have great influence on the static characteristics of the heat-roller are d3, d1, l1, l2 and F. Through optimum design, the weight of the roller was reduced by 15.18%. The analysis results provide a reference for the design of other similar structures.

Taking a heat-roller of a laser printer as the research object, the dynamic characteristics and reliability were analyzed by using the finite element software ANSYS. Through modal analysis, it can be concluded that the first eighth natural frequencies of the heat-roller are 1343, 1365, 3612, 3677, 6885, 7001, 7168, 10634 Hz. The corresponding modal modes are as follows: except that the fifth mode is the torsional mode of the structure, the other modes are the bend mode. Through the harmonic response analysis, it can be concluded that the first mode has the greatest influence on the dynamic characteristics of the structure. The sensitivity analysis results show that the material characteristics and size parameters which have great influence on the dynamic characteristics of the structure are l 2, den, ex, d 1, d 3 and x.