公开(公告)号：US3864739A

公开(公告)日：1975-02-04

申请号：US39140573

申请日：1973-08-24

Applicant: IBM

Inventor： JACKSON HOWARD C

IPC: H04N5/7826 ,  G05D13/62 ,  G11B15/087 ,  G11B15/18 ,  G11B15/46 ,  G11B15/467 ,  G11B15/60 ,  G11B15/61 ,  G11B15/20

CPC classification number: G11B15/61 ,  G11B15/1808 ,  G11B15/602

Abstract: In a rotating head magnetic tape transport, the tape is maintained stationary as the head sweeps a selected data track. A length of tape is buffered in a vacuum column between a supply spool and the rotating head station. A take-up spool on the opposite side of the head station is servo controlled to maintain proper head/track alignment and to periodically step the tape to an adjacent track. Changes in the tape radius on the take-up spool are compensated for by (1) a stop-lock source of motor energization whose magnitude is servo controlled by unbalance between the vacuum column force tending to pull the tape in one direction and the take-up spool motor torque tending to pull the tape in the opposite direction, and (2) a step modification network which responds to head/track alignment error caused by the variable tape radius on the take-up spool.

Abstract translation: 在旋转磁头磁带传输中，当磁头扫描所选择的数据磁道时，磁带保持静止。 一段磁带被缓冲在供应卷轴和旋转头站之间的真空塔中。 在头站的相对侧上的卷取卷轴被伺服控制以保持适当的头部/轨道对准并且周期性地将带移动到相邻的轨道。 通过（1）电动机通电的停止锁定源来补偿卷取线轴上的磁带半径的变化，其幅度由伺服控制，真空柱力在倾向于沿一个方向拉动磁带之间的不平衡， 提升卷轴电机扭矩倾向于沿相反方向拉动胶带，以及（2）响应由卷取卷轴上的可变带半径引起的打印头/轨道对准误差的步进修改网络。

公开(公告)号：CA1043012A

公开(公告)日：1978-11-21

申请号：CA227643

申请日：1975-05-23

Applicant: IBM

Inventor： ARTER NELSON K ,  BROCK GEORGE W ,  JACKSON HOWARD C ,  LEGGATE JAMES W

IPC: H04N5/7826 ,  B65H23/032 ,  G05D13/62 ,  G11B15/087 ,  G11B15/18 ,  G11B15/467 ,  G11B15/54 ,  G11B15/60 ,  G11B15/61 ,  G11B27/13 ,  G11B21/04 ,  G11B15/46

Abstract: TRANSVERSE TRACK LOCATION A track or stripe tape positioner for a helical scan or rotary head recorder uses digital techniques. The expected step size is preset into a counter. During the next phase, a calibration phase, the tape is stepped through a plurality of stripes whereat the present value is adjusted to measured values. In the third phase, the average step size is maintained subject to certain averaged changes thus providing a high degree of noise rejection to ensure reliable incremental stepping of a record tape through the recorder.

公开(公告)号：CA1064614A

公开(公告)日：1979-10-16

申请号：CA260155

申请日：1976-08-30

Applicant: IBM

Inventor： ARTER NELSON K ,  JACKSON HOWARD C

IPC: H04N5/7826 ,  G05D3/12 ,  G05D13/62 ,  G11B15/18 ,  G11B15/467 ,  H02P3/06 ,  G11B15/32 ,  G11B15/58 ,  G11B15/20

Abstract: ADAPTIVE GAIN CONTROL IN AN INCREMENTING MAGNETIC TAPE TRANSPORT In a rotating head magnetic tape transport, the tape is maintained stationary as the head sweeps a selected data track. A length of tape is buffered in a vacuum column between a supply spool and a rotating head station. A take-up spool on the opposite side of the head station is controlled by minimizing the overshoot or undershoot of the motor driving the take-up spool as the radius of the amount of tape on the spool increases or decreases (i.e., change). After a step operation, the overshoot or undershoot of the motor is measured and compared with a reference range to determine if the undershoot or overshoot is within the reference range. If the measured quantity is within the reference range, no adjustment is made. If the measured quantity is outside of the reference range, the gain of the take-up motor is adjusted.

公开(公告)号：CA1096037A

公开(公告)日：1981-02-17

申请号：CA277576

申请日：1977-05-02

Applicant: IBM

Inventor： ARTER NELSON K ,  EICHHORN THOMAS F ,  JACKSON HOWARD C

IPC: H04N5/7826 ,  G05D3/12 ,  G05D13/62 ,  G11B5/588 ,  G11B15/087 ,  G11B15/467 ,  G11B15/60 ,  G11B20/20 ,  G11B21/10

Abstract: In a magnetic recording device skew between data tracks, recorded on a length of magnetic media, and a magnetic transducer is corrected dynamically by a close loop controlled servo system. When the magnetic transducer is not in transducing relationship with the magnetic media, an offset number is placed into a stop/lock counting means. The stop/lock counting means is one of the elements which is positioned in the close loop of the servo system. The stop/ lock counting means outputs a series of pulses as the offset number is decremented. The pulses are converted to analog voltages which, in turn, energize a motor which rotates a take-up spool (capstan) on which the media is wound passing said magnetic transducer. Due to the translation of said media, whenever the count in the stop/lock counting means is zero, the magnetic transducer is positioned in registry with the selected data track on the magnetic media. BO976007

公开(公告)号：CA1044802A

公开(公告)日：1978-12-19

申请号：CA205111

申请日：1974-07-17

Applicant: IBM

Inventor： JACKSON HOWARD C

IPC: H04N5/7826 ,  G05D13/62 ,  G11B15/087 ,  G11B15/18 ,  G11B15/46 ,  G11B15/467 ,  G11B15/60 ,  G11B15/61 ,  G11B5/52

Abstract: TAPE MOTION CONTROL IN AN INCREMENTING MAGNETIC TAPE TRANSPORT In a rotating head magnetic tape transport, the tape is maintained stationary as the head sweeps a selected data track. A length of tape is buffered in a vacuum column between a supply spool and the rotating head station. A take-up spool on the opposite side of the head station is servo controlled to maintain proper head/track alignment and to periodically step the tape to an adjacent track. Changes in the tape radius on the take-up spool are compensated for by (1) a stop-lock source of motor energization whose magnitude is servo controlled by unbalance between the vacuum column force tending to pull the tape in one direction and the take-up spool motor torque tending to pull the tape in the opposite direction, and (2) a step modification network which responds to head/track alignment error caused by the variable tape radius on the take-up spool.

公开(公告)号：CA1304514C

公开(公告)日：1992-06-30

申请号：CA572187

申请日：1988-07-15

Applicant: IBM

Inventor： AMMANN LAWRENCE M ,  JACKSON HOWARD C ,  JOHNSON CHARLES D ,  LUTTER EDWARD P

IPC: G06F9/455 ,  G06F13/12

Abstract: FAST EMULATOR USING SLOW PROCESSOR Software driven controller emulator includes hardware apparatus for emulating the controller at a speed faster than the software driven emulator, incorporating means for predicting a next event to be emulated and preactivating dedicated logic to emulate the controller driving the next event. In case of errors, the hardware controller sets a code signal and returns emulation to the software driven emulator for error recovery identified by the code signal. BO987003

公开(公告)号：CA1045243A

公开(公告)日：1978-12-26

申请号：CA290156

申请日：1977-11-03

Applicant: IBM

Inventor： JACKSON HOWARD C

IPC: G11B5/52 ,  G11B15/18

Abstract: TAPE MOTION CONTROL IN AN INCREMENTING MAGNETIC TAPE TRANSPORT In a rotating head magnetic tape transport, the tape is maintained stationary as the head sweeps a selected data track. A length of tape is buffered in a vacuum column between a supply spool and the rotating head station. A take-up spool on the opposite side of the head station is servo controlled to maintain proper head/track alignment and to periodically step the tape to an adjacent track. Changes in the tape radius on the take-up spool are compensated for by (1) a stop-lock source of motor energization whose magnitude is servo controlled by unbalance between the vacuum column force tending to pull the tape in one direction and the take-up spool motor torque tending to pull the tape in the opposite direction, and (2) a step modification network which responds to head/track alignment error caused by the variable tape radius on the take-up spool.

公开(公告)号：FR2278131A1

公开(公告)日：1976-02-06

申请号：FR7518999

申请日：1975-06-12

Applicant: IBM

Inventor： ARTER NELSON K ,  JACKSON HOWARD C ,  LEGGATE JAMES W

IPC: B65H23/032 ,  G05D13/62 ,  H04N5/7826 ,  G11B15/087 ,  G11B15/18 ,  G11B15/467 ,  G11B15/54 ,  G11B15/60 ,  G11B15/61 ,  G11B27/13 ,  G11B5/02

Abstract: A track or stripe tape positioner for a helical scan or rotary head recorder uses digital techniques. The expected step size is preset into a counter. During the next phase, a calibration phase, the tape is stepped through a plurality of stripes whereat the preset value is adjusted to measured values. In the third phase, the average step size is maintained subject to certain averaged changes thus providing a high degree of noise rejection to ensure reliable incremental stepping of a record tape through the recorder.