Magnetic tape wind-up control method, and tape wind-up apparatus

A tape wind-up control method in which, when a predetermined length of tape fed from a feed reel is wound around a wind-up reel, the speed at which the tape is moved is controlled on the basis of a predetermined reference speed pattern comprising an acceleration zone, which is of a predetermined duration and which starts when the winding-up of the magnetic tape is begun, and a deceleration zone which is of a predetermined duration and which terminates when the winding-up of the magnetic tape is finished,

• wherein the improvement comprises the steps of:
• (i) selecting at least one check point in the deceleration zone of said reference speed pattern,
• (ii) detecting the length, over which said tape has been moved after the winding-up of said tape was begun, at said check point,
• (iii) comparing the detected length with a reference tape movement length which is based on said reference speed pattern, and
• (iv) controlling the speed, at which said tape is moved, on the basis of the results of said comparison so that said predetermined length of tape has been wound around said wind-up reel at the end of said reference speed pattern.

A tape wind-up apparatus in which a feed reel and a wind-up reel are rotatively driven by individual drive means and in which a tape wound up on said feed reel is wound up onto the wind-up reel, the apparatus comprising:

• speed detection means for detecting the tape movement speed between said two reels,
• comparison means for comparing a speed signal, output from said speed detection means, with a predetermined speed pattern reference signal,
• control means for driving and controlling the drive means on the feed reel side so that said tape movement speed follows a speed pattern on the basis of the result of the comparison made by said comparison means, tape-diameter detection means for detecting the diameter of the tape wound up on said feed reel and outputting tape-diameter information on the basis of the detected result, and
• gain correction means for correcting a gain supplied to said control means, which drives and controls the drive means on the feed reel side on the basis of tape-diameter information output from said tape-diameter detection means.