Patent ID: 6712302
Filing Date: 2004-03-30
Classification: G11B

Abstract:
A tension control system for providing dynamic tension control for tape transported along a tape path between a supply reel and a take-up reel, said supply reel driven by a supply reel motor, said take-up reel driven by a take-up reel motor, comprising:a supply tachometer for measuring the rotational angular displacement of said supply reel; a take-up tachometer for measuring the rotational angular displacement of said take-up reel; and a controller for operating said supply reel motor and said take-up reel motor, said controller: measures said rotational angular displacement of said supply reel from said supply tachometer; measures said rotational angular displacement of said take-up reel from said take-up tachometer; determines from said measured rotational angular displacement of said supply reel, the rotational angular velocity of said supply reel; determines from said determined rotational angular velocity of said supply reel, a linear speed for said tape at said supply reel; determines from said measured rotational angular displacement of said take-up reel, the rotational angular velocity of said take-up reel; determines from said determined rotational angular velocity of said take-up reel, a linear speed for said tape at said take-up reel; compares said determined linear speed for said tape at said supply reel to said determined linear speed for said tape at said take-up reel, to determine a delta velocity between said linear speeds; and operates at least one of said supply reel motor and said take-up reel motor in accordance with a function of said delta velocity to provide a torque to at least one of said supply reel and said take-up reel tending to reduce said delta velocity.