| 摘要 |
A driving pinion (15) turns on an axis (16) at right angles to the frame, and meshes with a driving rack (18) contg. one or two sets of teeth. A double pinion (19) has portions (21,22) of different dias., on an axis (20) at right angles to that of the driving pinion and extending in the plane of the frame. One or more output racks (24) are coupled by bosses (13) to the driving rods (4). The teeth (17) of the driving pinion, and those of the smaller part of the double pinion, mesh with the driving rack. The teeth of the larger part of the double pinion mesh with those (23) of the output rack.
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