| 摘要 |
In a ruling machine of the type in which a recorder pencil is carried by a carriage which is moved in accordance with a scanner, an arrangement for enlarging or reducing the distance travelled by the recorder pencil relevant to the scanner to thereby counteract distortions which would otherwise arise when the pattern made by the recorder pencil is stretched as when mounted on a cylinder of a printing press. A threaded shaft extends in the direction in which enlargement or reduction is to take place, a nut threadedly but non-rotationally engages the shaft for movement therealong and a projection from the carriage extends into the path of travel of the nut and is urged thereagainst by a spring. A wedge member is positioned between the projection and the nut. This wedge member rides along a guide bar to vary its position between the nut and the projection so that the distance between the nut and the projection varies as the nut travels along the shaft.
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