| 摘要 |
The slide plate held in a frame is designed to be longitudinally displaceable by driving devices (23), the driving devices (23) serving as a supporting device for the frame and the slide plate and thus replacing a separate housing. According to one illustrative embodiment, two such drive units are arranged on the opposite sides of the frame, parallel to the longitudinal direction of the latter, for the purpose of effecting the longitudinal displacement. In a preferred embodiment, further drive units (27), of fundamentally similar design, are arranged on one or both transverse sides of the frame, these drive units serving for the transverse displacement of the frame (21). The drive units can be designed as piston-cylinder units operated by means of a pressurised fluid and having piston rods protruding from the cylinder at both ends or as a driven screw with a travelling motor or as an electric linear motor. <IMAGE> |
