Research On Elastic Reflection Error Overprint Of The Sheet-transferring Mechanism

Sheet transfer mechanism is a key part of an offset press and the eccentricity swing sheet-transferring mechanism is widely used in the offset printing machine. Its precision will affect the speed of printing and the quality of printing product directly. This paper took YP1A1H sheet-transferring mechanism as a model, through using mechanism principle and modern dynamic analyzing and designing principle, the elastic dynamics of the mechanism is analyzed, the error of the motion track of the sheet-transferring gripper which affected by the processing error of the cam and the elastic distortion of the component is researched and analyzed, the dynamic and static state of the mechanism under different motion laws is compared.This paper includes the key points in the listed below:(1)The mechanism's motion is analyzed and the outline curve of the cam is acquired by using reversal resolution. Using plural vector method, selecting four different motion laws of the mechanism follower, the relation between sheet-transferring gripper's motion character and the outline curve of cam is established.(2)The static configuration of the mechanism is analyzed, the relation between placement error of the sheet-transferring gripper and processing and manufacturing error of the outline curve of the cam is reflected according to vector relation. It is indicated that displacement error is different under different motion law.(3)The elastic kinetics of the sheet-transferring mechanism is analyzed, first analyze and calculate elastic distortion of the mechanism, then work out displacement error of the sheet-transferring gripper which affected thereby. It is indicated that dynamic motion error is proportioned with the machine speed.(4)Considered original error, comprehensive analysis of the mechanism is done from both dynamic and static sides. It is indicated that the static error most effect sheet-fetching point and the dynamic error dominate sheet-connecting point.(5)Comparing demo of the sheet-transferring mechanism is compiled by using Visual C++ and MATLAB, which reflects the error.Through researching, the job above is done and the expected goal is reached, which make the mechanism work in a more higher rotate speed and control the processing error of the cam in a permitted area.