| 摘要 |
A solenoid driven magnification changer shaft for a microscope with positive index stops. The solenoid shaft that both translates and rotates when the solenoid is activated. A coupler couples the solenoid shaft to the magnification changer shaft so as to permit the coupler to rotate as a unit with the magnification changer shaft but at the same time to translate axially on the magnification changer shaft. The magnification changer shaft includes a slot extending axially from a point spaced from the end of the shaft and extending a predetermined distance. The coupler includes a recess for receiving the free end of the shaft and a transverse bore for receiving a pin which extends through the transverse bore and the slot in the magnification changer shaft. The coupler and the surrounding driver housing include cooperating index pins and a stop pin. The index pin will be driven into interfering alignment with the stop pin when the solenoid shaft translates and will interfere with the stop pin when the solenoid shaft causes the coupler to rotate to provide a positive stop for the magnification changer shaft.
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