Geometrical instruments – Distance measuring – Of flexible material
Patent
1992-07-24
1993-12-07
Cuchlinski, Jr., William A.
Geometrical instruments
Distance measuring
Of flexible material
33754, G01B 508, G01B 510
Patent
active
052674010
ABSTRACT:
Method and apparatus are disclosed for determining the diameter of sheet material wound on a reel, and for setting the tension on sheet material as it is wound on the reel. According to one embodiment, the diameter of a take-up reel including sheet material wound thereon is determined from the angle of rotation or instantaneous angular speed of the take-up reel, and movement of the sheet material as obtained from rotation of a circular element such as a drive roller in a pinch roller drive system which rotates in proportional to sheet material movement. In another embodiment, the diameter of a reel in a reel-to-reel transport system is determined from the angles of rotation or instantaneous angular speeds of the supply and take-up reels, the total amount of sheet material in the system, and the packing factor of the sheet material rewound on the take-up reel. The diameter determination may then be used to set the torque of the drive motor for the take-up reel, and thereby the tension on the sheet material during winding.
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Freeman Marvin L.
Zinsmeyer Charles D.
Cuchlinski Jr. William A.
Fulton C. W.
Summagraphics Corporation
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