公开(公告)号：JP2002312991A

公开(公告)日：2002-10-25

申请号：JP2002075892

申请日：2002-03-19

Applicant: IBM

Inventor： KOSKI JOHN A

IPC: G11B15/43 ,  G11B15/46

Abstract: PROBLEM TO BE SOLVED: To disclose a method and an apparatus for calibrating a tape transport servo system. SOLUTION: This method for calibrating the tape transport servo system is disclosed for a tape drive. When the tape drive is not being controlled by the tape transport servo system, tape reel motors are excited. Next, calibration data for a motor torque, motor friction, DAC offsets and pulse width modulator control signal timing are collected.

公开(公告)号：FR2414238A1

公开(公告)日：1979-08-03

申请号：FR7836586

申请日：1978-12-20

Applicant: IBM

Inventor： WEAVER RICHARD B ,  KOSKI JOHN A

IPC: G11B15/02 ,  G11B5/09 ,  G11B15/087 ,  G11B15/44 ,  G11B20/12 ,  G11B27/30 ,  G11B15/18

Abstract: Apparatus and method for controlling a reel-to-reel tape drive so that its performance characteristics are optimized to best suit the operational mode or availability of a host system by modifying tape speed adaptively according to predetermined conditions sensed during processing of data (i.e., while the tape is in motion). For example, tape might initially be fed at a high speed suitable for archiving; but if more than a predetermined number of "backhitches" (overruns of the interblock gap, IBG) occur during processing of a preselected number of successive blocks of data, the host will cause tape speed automatically to be reduced to a lower rate. This lower rate will enable the tape to stop in the IBG and is therefore suitable for intermittent processing. Preferably, before reducing speed during write operations, appropriate signals are generated at the host to command an increase in the IBG from a normal distance to a larger distance if backhitches exceed said preselected number. If this fails to reduce backhitches to an acceptable level, speed will be reduced to the lower rate and the gap preferably restored to its normal distance.

公开(公告)号：FR2331860A1

公开(公告)日：1977-06-10

申请号：FR7631435

申请日：1976-10-11

Applicant: IBM

Inventor： KOSKI JOHN A ,  LISSNER RUDOLF W ,  ROBERTS SPENCER D

IPC: G05D13/62 ,  B65H23/18 ,  B65H77/00 ,  G11B15/30 ,  G11B15/43 ,  G11B15/46 ,  G11B15/48 ,  G11B15/54 ,  G11B27/13 ,  G11B15/26

Abstract: 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 control mechanism is employed in which one motor drives the take-up reel and one motor drives the supply reel to maintain the appropriate 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.

公开(公告)号：CA1084146A

公开(公告)日：1980-08-19

申请号：CA265439

申请日：1976-11-12

Applicant: IBM

Inventor： KOSKI JOHN A ,  LISSNER RUDOLF W ,  ROBERTS SPENCER D

IPC: G05D13/62 ,  B65H23/18 ,  B65H77/00 ,  G11B15/30 ,  G11B15/43 ,  G11B15/46 ,  G11B15/48 ,  G11B15/54 ,  G11B27/13 ,  G03B1/04 ,  G11B15/32

Abstract: REEL-TO-REEL WEB TRANSPORT CONTROL APPARATUS 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 control mechanism is employed in which one motor drives the take-up reel and one motor drives the supply reel to maintain the appropriate 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.