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# Dynamically Aligning a Rotating Circular Member

IP.com Disclosure Number: IPCOM000073953D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 29K

IBM

## Related People

Jacobsen, RR: AUTHOR [+2]

## Abstract

Shown is a device for measuring the dynamic alignment of a tape capstan 10 relative to a surface 12 to which its axis should be perpendicular. Ball bearings 14 and 15 housed in frame 16 are used to measure the perpendicular alignment of the axis of the wheel 10 to the surface 12. Balls 14 and 15 are mounted so that they make contact at point 18. The input ball 14 will be rotated because of its contact with the rotating capstan 10. The output ball 15 will have a rotational speed proportional to the position of the axis of rotation of the input ball 14. The axis of rotation of the input ball 14 will depend upon the perpendicular alignment of the rotating capstan 10 to the surface 12.

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Dynamically Aligning a Rotating Circular Member

Shown is a device for measuring the dynamic alignment of a tape capstan 10 relative to a surface 12 to which its axis should be perpendicular. Ball bearings 14 and 15 housed in frame 16 are used to measure the perpendicular alignment of the axis of the wheel 10 to the surface 12. Balls 14 and 15 are mounted so that they make contact at point 18. The input ball 14 will be rotated because of its contact with the rotating capstan 10. The output ball 15 will have a rotational speed proportional to the position of the axis of rotation of the input ball
14. The axis of rotation of the input ball 14 will depend upon the perpendicular alignment of the rotating capstan 10 to the surface 12.

In operation, the frame 16 is positioned so that its end wall abuts against the surface 12, and the input ball 14 is in contact with the capstan 10. If the axis of the capstan 10 is perpendicularly aligned to the surface 12, then the input ball 14 will rotate about an axis which is aligned with the center of the output ball 15. In effect, the input ball 14 spins about the point contact 18 just as a top would spin about a point. There is no transmission of motion to the output ball 15. If the axis of the capstan 10 is not perpendicularly aligned to the surface 12, then the axis of rotation of input ball 14 will not be aligned with the center of the output ball
15. In this case, a component of rotation of input ball 14 will be passed to the...