Reel to reel web transport control apparatus

Details Reel to reel web transport control apparatus Reel to reel web transport control apparatus

G - Physics

11

B

341/48, 352/21.2

G11B 15/32 (2006.01) G11B 5/008 (2006.01) G11B 15/30 (2006.01) G11B 15/43 (2006.01) G11B 15/46 (2006.01) G11B 15/48 (2006.01) G11B 15/54 (2006.01) G11B 27/13 (2006.01)

Patent

CA 1084146

REEL-TO-REEL WEB TRANSPORT CONTROL APPARATUS Abstract of the Disclosure A reel-to-reel web (tape) transport apparatus which has no tape length buffering between the supply and take-up reels. The tape follows a fixed length path from the supply reel, past a read/write head and guides, to a take-up reel. A two motor con- trol mechanism is employed in which one motor drives the take-up reel and one motor drives the supply reel to maintain the appro- priate tension and tape motion at the read/write head. The control mechanism is adaptive to dynamic changes as the tape is moved from the supply reel to the take-up reel. Three quantities are monitored: lineal tape position and the angular reel displacement of the supply and take-up reel. From these quantities reel radii are derived, tape inertia calculated and the velocity or position error is determined. A motor current algorithm is utilized to generate the appropriate torque for each reel to drive the control error to zero along a predetermined profile with negligible tape tension disturbances. The result is a reel-to-reel tape drive with static and dynamic performance characteristics which are independent of reel radius and inertia changes resulting from tape motion.

265439

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