| 摘要 |
<P>PROBLEM TO BE SOLVED: To uniformly suppress a rotation angle error all over the whole area in the circumferential direction in a dynamic state. <P>SOLUTION: When rotationally driving a blanket roll 1 by using a drive motor 6 via a wave reduction gear 5, an angle transmission error of the wave reduction gear 5 is detected, and a temporary correction formula approximated with a periodical error waveform of the wave reduction gear 5 is established by using an sin-factor corresponding to a first frequency to a fourth frequency of a space frequency which is obtained by Fourier-transforming the detected angle transmission error at a high speed. Next, a correction formula is obtained by adding, to the sin-factor corresponding to the first frequency of the space frequency in the temporary correction formula, correction related to displacement depending on an amplitude in a waveform of the angle transmission error of the wave reduction gear 5 which is obtained by being corrected by the temporary formula, and also depending on a rotation angle at the output side of the wave reduction gear 5. Correction is added to a target rotation angle of the blanket roll 1 by using the obtained correction formula, and the drive motor 6 is driven so that the corrected target rotation angle may be obtained. <P>COPYRIGHT: (C)2012,JPO&INPIT |
