| 摘要 |
A device for generating position signals in dependence upon the relative position of two machine parts which are linearly displaceable relative to one another has an information carrier (16) supported on one machine part such as the carriage (10) of a machine tool. This information carrier (16) comprises a plate (18) of plastics material which extends in the direction of displacement of the carriage (10). A metallic layer (20) extends over the whole surface of the plate (18) and a number of information tracks (1-4) extend along the layer (20). At least one strip (22<1>, 24<2> 26<3>, 28<3>, 30<4>) of metal foil is aligned along each information track such that each track has at least two areas having differing electrical conductivity and/or cross-section. A multi-limit switch (12) having an inductive proximity switch (40<1>-40<4>) associated with each track (1-4) is mounted on a stationary machine part (14). As the carriage (10) moves relative to the machine part (14) the proximity switches (40<1>-40<4>) scan the respective tracks (1-4) and generate position signals. <IMAGE> |
