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Browse Prior Art Database

Lifting/Rotating Device for Transferring Workpieces

IP.com Disclosure Number: IPCOM000041669D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Wolbold, G: AUTHOR

Abstract

For automatically transferring a workpiece from a first position A to an adjacent second position D on the same level, the carrier arm is fixed to a lifting/rotating spindle. The spindle is driven by a rotary drive motor. By means of a threaded spindle, the lifting/rotating spindle, together with the arm and the workpiece, initially performs a lifting motion to position B, then a rotary motion to position C, and finally, after the motor's direction of rotation has been reversed, a return lifting motion to position D to deposit the workpiece. The subsequent return rotary motion causes the spindle and the carrier arm to be restored to their original position A. According to Fig. 2, a stepper motor 1 is coupled to a threaded spindle 2 which engages the internal thread of a lifting/rotating spindle 3.

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Lifting/Rotating Device for Transferring Workpieces

For automatically transferring a workpiece from a first position A to an adjacent second position D on the same level, the carrier arm is fixed to a lifting/rotating spindle. The spindle is driven by a rotary drive motor. By means of a threaded spindle, the lifting/rotating spindle, together with the arm and the workpiece, initially performs a lifting motion to position B, then a rotary motion to position C, and finally, after the motor's direction of rotation has been reversed, a return lifting motion to position D to deposit the workpiece. The subsequent return rotary motion causes the spindle and the carrier arm to be restored to their original position A. According to Fig. 2, a stepper motor 1 is coupled to a threaded spindle 2 which engages the internal thread of a lifting/rotating spindle
3. Spindle 3 is pivotally and axially movable in a ball bushing 4 and its upper end is provided with a carrier arm 5 for the workpiece 6, e.g., a wafer. The lifting motion of the lifting/rotating spindle 3 is limited by an upper stop 7 and a lower stop 8. After workpiece 6 has been picked up, for example, in response to a vacuum applied to carrier arm 5 by line 9 through lifting/rotating spindle 3, threaded spindle 2 converts the rotary motion of stepper motor 1 into a lifting motion of the height "a" until lifting/rotating spindle 3 reaches upper stop 7 and position B. Subsequently, lifting/ rotating spindle 3 is forced...