| 摘要 |
PCT No. PCT/CH85/00148 Sec. 371 Date Jun. 6, 1986 Sec. 102(e) Date Jun. 6, 1986 PCT Filed Oct. 8, 1985 PCT Pub. No. WO86/02156 PCT Pub. Date Apr. 10, 1986.An element of a machine is provided with a magnetically or optically readable data medium. The data medium is divided into grooves and sectors. A corresponding scanning head for scanning the data medium is arranged on another element of the machine. The data are coded so that it is possible to identify each sector and each groove on the data medium. After reading the contents of the data medium of the element of the machine by the scanning head of the other element, a value of the measurement of the relative positions of the two elements is affected to the data read by the head. This value may be used to control the position of the elements or to displace one of the elements relative to the other. The data medium may be linear or may be configured as a disc. The scanning head may be secured to the associated element. It may also be attached by means of a mechanism so as to have a relative motion with respect to the data medium even when the elements are stationary with respect to each other.
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