| 摘要 |
<p>The micrometer drive has a drive shaft moving the preparation container. The shaft carries a bush upon which are a hand wheel and a drive belt pulley mounted so as to be rotatable. The hand wheel is reliably decoupled when the arrangement is switched to motor drive. The drive mode is easily recognised. The drive mode is controlled by an axially movable pin (15) mounted in the bush (11) parallel to the drive shaft. The pin is either engaged with the hand wheel (12) or the belt drive pulley (14) via a take-up device (19) engaging a cut-out (20) in the bush (11). A second pressure pin (15'), parallel to the first and also having an axial spring (16'), may be used. The pins are constrained to move in opposition.</p> |
