Solve the registration problem of paper sizes

Inconsistent paper size is bound to bring great difficulties to register. In the normal working condition of the paper-pressing roller, the longitudinal size of the paper is too long, the pressure of the paper-pressing roller will be too much, and the pulling gauge will not be pulled; if the longitudinal size of the paper is too small, the pressure of the paper-pushing roller will be too small. , produce paper rebound. How to ensure the accuracy of overprinting when the paper is inconsistent longitudinally?

From the example of the Beiren J2205 offset press, it is only necessary to replace the two rear pressure rollers of the four pressure rollers on it with Beiren’s roller brush roller, because of the pressure roller There are hard brush around, and there will not be much friction between hard brush and paper. In this way, even if the paper feeding direction is too long, the Buchner wheel pressure is too long. Because the friction force is small, the pull tab will not be pulled out of position. If the rolling pressure roller is moved forward by about 5mm on the original basis, for the paper whose longitudinal size is too small, the pressing pressure of the pressure roller will not be too small, and there will be no rebound phenomenon.