Method for adjusting paper changing device of block paper and paper changing device of block paper

A method for adjusting paper changing device of block paper, which is provided with a cascade control circuit (14); the cascade control circuit (14) is composed of a current adjuster (15) and a rotation speed adjuster (16) stacked with the current adjuster (15), which is used for adjusting the rotation speed of a motor (13) which is used for driving a print material block (10) so as to adjust the peripheral speed of the print material coil block or the amplitude speed of a print material amplitude face (12) unfolded by the print material coil block; the rotation speed adjuster (16) outputs an output value (22) according to a rated rotation speed value (19) and an actual rotation speed value (20); in order to figure out an input value (23) of the current adjuster (15), the output value is at least calculated with one pre-control value (24); the pre-control value of current, acquired by the previously adjusted thickness of the print material coil block, is regarded as the pre-control value (24); the pre-control