| 摘要 |
The essence of the invention consists in that first a preliminary adjustment of a measuring disk and an indicating disk (9, 2) is effected while turning the indicating disk (2) about the rotation axis of the shaft (4). On final adjustment of the measuring disk (9), two areas of its coding path (10) located at an angle ( alpha 1) are illuminated by means of illuminators (13), the bisector vector of the angle ( alpha 1) is determined and, while continuously turning the measuring disk (9) electric signals (18, 19) are generated by means of reading elements (15, 16), one of them being used as a reference signal and the other as a measuring signal. The eccentricity (e) of the path (10) is determined from the extreme values of the variable component of the phase difference ( DELTA phi ) of the signals (18, 19), and the moment of coincidence of the eccentricity vector and the bisector vector of the angle ( alpha 1) is determined from the change of sign and direction of said variable component. The disk (9) is moved by means of a mechanism (11) in a direction opposite to vector (e &cir& NOt ) until the variable component of the phase difference ( DELTA phi ) equals zero. On final adjustment of the indicating disk (2) another area of the path (10) is illuminated, the adjusted disk (9) is turned and an additional electric signal (21) is generated. The deviations from the calculated value of the phase difference ( DELTA phi ) between the reference and measuring signals and between the reference and additional signals (18, 19, 21) are determined. Then the disk (2) is moved by means of the mechanism (6) until the deviations of the phase difference ( DELTA phi ) equal zero. |
