公开(公告)号：JPS62209782A

公开(公告)日：1987-09-14

申请号：JP201187

申请日：1987-01-09

Applicant: IBM

Inventor： ASHBEE WILLIAM HENRY ,  KILEN RICHARD SCOTT ,  KIRTON ALAN JOHN ,  RITTENHOUSE LARRY EDWARD ,  VALENT JAMES ALFRED

IPC: G11B21/08 ,  G11B5/55

公开(公告)号：DE3774293D1

公开(公告)日：1991-12-12

申请号：DE3774293

申请日：1987-02-03

Applicant: IBM

Inventor： ASHBEE WILLIAM HENRY ,  KILEN RICHARD SCOTT ,  KIRTON ALAN JOHN ,  RITTENHOUSE LARRY EDWARD ,  VALENT JAMES ALFRED

IPC: G11B21/08 ,  G11B5/55 ,  G11B21/10

公开(公告)号：CA1236568A

公开(公告)日：1988-05-10

申请号：CA529772

申请日：1987-02-16

Applicant: IBM

Inventor： ASHBEE WILLIAM HENRY ,  KILEN RICHARD SCOTT ,  KIRTON ALAN JOHN ,  RITTENHOUSE LARRY EDWARD ,  VALENT JAMES ALFRED

IPC: G11B21/08 ,  G11B5/55 ,  G11B21/10

Abstract: MAGNETIC HEAD POSITIONING APPARATUS AND METHOD An apparatus and method are disclosed for positioning magnetic heads relative to the recording tracks of a recording medium such as a floppy disk having circular, concentric recording tracks formed thereon. The magnetic heads are mounted on a head carriage, and the head carriage is moved, in response to received command pulses, so that the heads are moved linearly, by step increments, along a radius of the floppy disk. The heads are thereby moved across the spaced tracks on the disk, with each incremental movement of the heads being a distance less than the distance between the tracks, and being, for example, onehalf or one-fourth of the total distance between tracks. Acoustic noise due to head movement is minimized by moving the heads by increments less than the distance between the tracks, with such movement avoiding exciting the resonances of the head moving apparatus. The magnetic heads are initially moved at a rate known to avoid exciting the resonance and, during such initial movement, the rate of received command pulses is determined. If the received command pulse rate is within a predetermined range, and is a rate that will not excite resonance, continued movement of the head is at the rate of the received command pulses.

公开(公告)号：DE3366626D1

公开(公告)日：1986-11-06

申请号：DE3366626

申请日：1983-11-10

Applicant: IBM

Inventor： ASHBEE WILLIAM HENRY ,  JANSSEN DONOVAN MILO ,  MARTIN RONALD JAMES ,  SEAWARD WILLIAM STEPHEN

IPC: B65H9/00 ,  G03G15/00 ,  B65H9/20

Abstract: Electronic alignment of paper feeding components in a machine such as an electrophotographic copier machine is achieved by placing an original master containing vernier calibrations on the document glass and a target master containing vernier calibrations in the copy paper bin. Thereupon, the machine is operated to produce a copy of the original master onto the target master producing a double set of vernier calibrations on the target master, which, when compared, provides information relating to skew angle, side edge relationship and leading edge alignment of the image to the copy paper. The vernier calibrations provide data which are keyed into a microprocessor controlled copy feeding servo mechanism to correct copy paper position and remove misalignment. The operation is repeated for various combinations of paper feed paths with techniques of original document placement and for duplex operation so that the copy paper matches image position for all modes of copier operation. For printer mode of operation, the master vernier is printed to produce the needed image. In addition, sensors are located in the copy paper path to automatically correct for deviations in the copy sheet feeding unit, caused by wear, for example, over a period of time. Sensors are also located in the document feeder so that corrections in the position of the copy paper may be made on an individualized and dynamic basis to electronically correct for misalignment of individual originals on the document glass.

公开(公告)号：DE3267035D1

公开(公告)日：1985-11-28

申请号：DE3267035

申请日：1982-07-30

Applicant: IBM

Inventor： ASHBEE WILLIAM HENRY ,  BERAN MARK ALEXANDER ,  COLGLAZIER DONALD FRANCIS ,  JANSSEN DONOVAN MILO ,  MANTEY JOHN PAUL ,  MARTIN RONALD JAMES ,  PATCH GERALD PAUL ,  RITTENHOUSE LARRY EDWARD ,  VALENT JAMES ALFRED

IPC: B65H1/30 ,  B65H7/20 ,  B65H83/00 ,  G03B27/62 ,  G03G15/00 ,  G03G15/04 ,  G03G21/00

Abstract: A copier document feed system includes a document stack tray (208) positioned over an exposure platen feed system (210). A document from the stack is fed to the platen feed system by a first turnaround system (214, 212). After exposure the document is fed to a deflector (218) to either the top (duplex path) or to the bottom (simplex path) of a second turnaround system (224, 222) or to a further tray (SADF path). When the document is fed to the bottom of the second turnaround system, this system drives it round back to the document stack tray. When the document is fed to the top of the second turnaround system, the feed direction of this sytem is reversed to feed the document, inverted, back to the exposure platen. The exposure platen feed system, and first and second turnaround systems are each driven by a separate servo system (254 260, and 248).

公开(公告)号：AU2982177A

公开(公告)日：1979-05-24

申请号：AU2982177

申请日：1977-10-18

Applicant: IBM

Inventor： ASHBEE WILLIAM HENRY

IPC: H03K21/00 ,  G05B19/414 ,  H03K21/10 ,  G06F15/20 ,  G06F9/16 ,  G05B15/00 ,  H03K21/16 ,  H03K21/08

Abstract: A hardware counter counts high rate, lower significant bits. A carry-borrow circuit responsive to the higher order bit position of the hardware counter includes cancel means responsive to successively received carry and borrow signals to cancel previously generated carries or borrows. Memory means in the carry-borrow circuit memorize the generation of the carry or borrow by the hardware counter. A programmed microprocessor, or the like, periodically senses the status of the carry-borrow circuit for transferring signal contents thereof to a software controlled count field. The arrangement permits high speed counting without interrupting the microprocessor and not imposing rate constraints on program execution of the microprocessor.