公开(公告)号：CA1097799A

公开(公告)日：1981-03-17

申请号：CA299885

申请日：1978-03-29

Applicant: IBM

Inventor： EIGE JOHN J ,  PATEL ARVIND M ,  ROBERTS SPENCER D ,  STEDMAN DAVID

IPC: G11B15/43 ,  B65H23/18 ,  G11B15/46 ,  G11B15/48 ,  G11B15/54 ,  G11B27/13 ,  G11B5/00 ,  G03B1/04

Abstract: TAPE MOTION CONTROL FOR REEL-TO-REEL DRIVE High tape acceleration rates are achieved in an unbuffered capstanless tape drive system by a tape motion control apparatus employing separate drive motors for each reel of a reel-to-reel tape transport. Tape moves from one reel past a read/write head and a tape tension sensor to the other reel, there being no tachometer in the tape feed path. A tachometer on one reel shaft provides a large number of pulses per revolution which pulses are counted by a counter; and a tachometer on the other reel shaft provides only one pulse per revolution, which pulse gates out the count then accumulated in the counter for actuating means to provide motor acceleration currents of a magnitude corresponding to said accumulated count according to a predetermined servo algorithm for controlling rotation of both reels. A tape radius constant corresponding to the actual length and thickness of tape in the system is calculated during initial wrap of tape onto the takeup reel. Tension is tightly controlled by an analog tension sensor and servo system.

公开(公告)号：CA2013058C

公开(公告)日：1995-02-14

申请号：CA2013058

申请日：1990-03-26

Applicant: IBM

Inventor： BELSER KARL A ,  DOUNN PAUL J ,  HENDERSON IAN E ,  KADLEC RONALD J ,  ROBERTS SPENCER D

IPC: G05B19/23 ,  G11B7/085 ,  G11B7/09 ,  G11B21/08 ,  G11B7/00

Abstract: ?U9-88-008 A track-seeking system for an optical disk using a velocity control loop with partially-digitized velocity measurement. A quadrature signal is generated based on summing the halves of a position error signal to give directionality to track-crossing counts. A so-called piggy-back construction, wherein a fine positioner is carried by a coarse positioner, is employed. Feed-forward controls are provided from the fine to the coarse positioner. At track-capture time, the dynamic range of the fine positioner is momentarily increased.

公开(公告)号：CA978255A

公开(公告)日：1975-11-18

申请号：CA166918

申请日：1973-03-13

Applicant: IBM

Inventor： MITCHELL JOHN O ,  ROBERTS SPENCER D ,  VAN PELT RICHARD W

IPC: H02P3/10 ,  G05B19/23 ,  G05D3/12 ,  G11B15/48 ,  H02P7/288

Abstract: A motor, moving at a known speed, is stopped in a controlled manner by a speed control servomechanism which compares the actual speed-versus-distance deceleration profile to an optimum or desired speed-versus-distance deceleration profile, and variably controls the reverse energization, or plugging, of the motor in a manner devised to achieve the desired profile. When the speed servo has reduced motor speed to a low level, and preferably zero, a stop-lock control servomechanism is enabled to position and maintain the motor at a preselected stop-lock position. The stop-lock servo implements a motor-control algorithm which, for a given position error, provides a higher magnitude motor energization when the motor is moving away from the stop-lock position than when the motor is moving back toward the stop-lock position. This control algorithm provides increased servo gain when the motor is moving away from the stop-lock position.

公开(公告)号：CA2012800C

公开(公告)日：1995-01-17

申请号：CA2012800

申请日：1990-03-22

Applicant: IBM

Inventor： CHOW WILLIAM W ,  FENNEMA ALAN A ,  FIORINO BENJAMIN C ,  HENDERSON IAN E ,  KADLEC RONALD J ,  ROBERTS SPENCER D

IPC: G05D3/12 ,  G11B7/085 ,  G11B11/105 ,  G11B21/08 ,  G11B7/00

Abstract: A track-seeking apparatus of a disk recorder employs a track-crossing sensor to produce track-crossing signals. An oscillator is slaved to the sensor for supplying substitute track-crossing pulses in the absence of the sensor providing such pulses or when the radial velocity exceeds a threshold velocity. A velocity profile means alters the oscillator frequency so that the oscillator produces track-crossing pulses in accordance with the profile. TU988001

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.

公开(公告)号：FR2391528A1

公开(公告)日：1978-12-15

申请号：FR7809977

申请日：1978-03-28

Applicant: IBM

Inventor： EIGE JOHN J ,  PATEL ARVIND M ,  ROBERTS SPENCER D ,  STEDMAN DAVID

IPC: G11B15/43 ,  B65H23/18 ,  G11B15/46 ,  G11B15/48 ,  G11B15/54 ,  G11B27/13 ,  G11B15/26

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.