| 摘要 |
A drive system for the conversion of a rotary motion into a linear motion contains a belt drive 12,15,16,17 similar to a block and pulley system, and a rack and pinion mechanism 13,14 that is driven synchronously with the belt drive. The pinion and the rack are adjusted with respect to each other such that the teeth of the pinion 13 engage with relatively large play in the rack 14. When driving under normal load, the drive takes place without loading of the rack and pinion mechanism by the belt drive, so that the reversal backlash and the play of the rack and pinion remain without effect on the displacement motion. When an overloading of the moving part and a corresponding stretehing of the drive belt occur, the tooth flanks of the pinion and of the rack are supported against each other and in this manner prevent tearing or overloading of the drive belt. The drive system is particularly suitable for use in focusing in microscopes. |
