Importance

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Abstract

A servo system for the rotary spindle of a machine tool in which the spindle is driven by a drive motor through a gear train having shiftable gears for changing the rate of rotation of the spindle. The transducer for the servo system is mounted directly on the motor drive shaft in order to avoid all backlash between the resolver and the drive motor. However, the transducer is arranged to regulate the angular orientation of the spindle and must therefore be maintained in synchronism with the spindle. This is accomplished by arranging the shiftable gears so that when they are moving into engagement with a new gear, engagement with the previously engaged gear is maintained until initial engagement with the new gear is achieved. Further shifting movement into full engagement with the new gear operates to release the previously engaged gear. Thus, during the initial engagement with the new gear, the shiftable gear is momentarily in engagement with both gears. As a result, there can be no relative movement between the gears and synchronism with the transducer is thereby maintained.

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First Claim