公开(公告)号：DE3278906D1

公开(公告)日：1988-09-22

申请号：DE3278906

申请日：1982-05-24

Applicant: IBM

Inventor： BOHNHOFF ALAN EARL ,  CASSIDY BRUCE MICHAEL ,  DYER STANLEY

IPC: B41J2/32 ,  B41J2/325 ,  B41J2/355 ,  B41J2/425 ,  B41J3/20

Abstract: An electrode drive configuration for a resistive ribbon (12) thermal printer utilizes as a feedback a monitored signal representative of an internal ribbon voltage at the print point. A monitoring contact (50) is preferably located on the opposite side of the printhead from the drive signal return contact (28) and the feedback signal is used to cancel the effects voltage drop variations in the common return portion of the drive signal path.

公开(公告)号：CA1162229A

公开(公告)日：1984-02-14

申请号：CA399063

申请日：1982-03-23

Applicant: IBM

Inventor： BOHNHOFF ALAN E ,  CASSIDY BRUCE M ,  DYER STANLEY

IPC: B41J2/32 ,  B41J2/325 ,  B41J2/355 ,  B41J2/425 ,  B41M5/26

Abstract: DRIVE CIRCUIT FOR THERMAL PRINTER of the Invention An electrode drive configuration for a resistive ribbon thermal printer utilizes as a feedback a monitored signal representative of an internal ribbon voltage at the print point. A monitoring contact is preferably located on the opposite side of the printhead from the drive signal return contact and the feedback signal is used to cancel the effects voltage drop variations in the common return portion of the drive signal path.

公开(公告)号：CA1230006A

公开(公告)日：1987-12-08

申请号：CA481596

申请日：1985-05-15

Applicant: IBM

Inventor： CROLEY DONALD F ,  DYER STANLEY

IPC: B41J29/36 ,  B41J3/20

Abstract: REPETITIVE MODE FOR THERMAL PRINTING LIFT-OFF CORRECTION Ribbon (22) in thermal printing has an outer layer which adheres to printed characters of intermediate temperatures, lower than printing temperatures. The printhead (7) has a column of electrodes (9) which sweep across the character area. Erase mode selector (16) causes erase of the same character twice, first at a temperature level moderately more than the normal erase level and one at a temperature moderately less than the normal erase level. Erasure in that dual mode is generally effective even for extreme conditions of paper, environment and other influences.

公开(公告)号：CA1222411A

公开(公告)日：1987-06-02

申请号：CA462551

申请日：1984-09-06

Applicant: IBM

Inventor： BARTLETT JOHN C ,  BOHNHOFF ALAN E ,  CROLEY DONALD F ,  DYER STANLEY ,  EDDS KENNETH E ,  HORLANDER FRANK J ,  STAFFORD DONALD W

IPC: B41J2/325 ,  B41J29/36 ,  B41J29/373 ,  B41M5/26

Abstract: DRIVE FOR THERMAL PRINTING LIFT-OFF CORRECTION Ribbon (22) in thermal printing has an outer layer which adheres to printed characters at intermediate temperatures, lower than printing temperatures. The printhead (7) has a column of electrodes (9) which sweep across the character area. Lift-off is accomplished by the pattern control (40) controlling the current source (38) to provide rapid, square wave pulses displaced in phase 180 degrees at adjoining electrodes (9). The high level of the pulses is about that of the level at printing, and the pulses are sufficiently rapid so that their net effect is to raise the outer layer ribbon (22) to the intermediate temperature. At areas corresponding to underlines of characters, duration of the up period is longer. Good, long term reliability is achieved by the significant erase level being very close to the print level.

公开(公告)号：DE3164702D1

公开(公告)日：1984-08-16

申请号：DE3164702

申请日：1981-05-12

Applicant: IBM

Inventor： APPLEGATE STEVEN LEWIS ,  DYER STANLEY

IPC: B41J2/325 ,  B41J2/35 ,  B41J2/42 ,  B41M5/382 ,  B41J3/20 ,  B41M5/24

Abstract: Current collector for a printer of the kind that uses a ribbon (10) having a central conducting layer (16) that is covered on one surface by a resistive layer (14) that receives electrical printing currents and on the other surface by a thermally transferrable ink layer (12), printing current is collected from the conducting layer (16) by an electrically conducting contactor (100) at the ink layer surface of the ribbon. Such contact through the ink layer (12) occurs on the takeup side of a printhead (20) where the integrity of the ink layer is not of concern and voids in the ink layer occur as a result of ink transfers for printing.

公开(公告)号：CA1172333A

公开(公告)日：1984-08-07

申请号：CA390744

申请日：1981-11-24

Applicant: IBM

Inventor： DYER STANLEY ,  MOLLOY JAMES J ,  WALKER DONALD A

IPC: B41J35/36 ,  G08B21/00

Abstract: LE9-80-022 RIBBON BREAK DETECTOR FOR PRINTERS A ribbon feed failure in a printer can cause serious problems, particularly for a printer that uses heat to cause selective ink transfers. Localized heat buildup may injure the printhead and, if allowed to continue, might injure other printer instrumentalities. According to the invention, it is recognized that for ribbons having a degree of electrical conductivity, a mechanical ribbon failure will almost always result in a detectable change of electrical properties. By monitoring the characteristics of an electrical circuit passing through a section of the ribbon around the print point and, preferably, also the printhead-ribbon interface, abnormal electrical parameter values that indicate ribbon failure may be detected to trigger a cessation of printer operation. For a presently preferred implementation in a printer that uses a printhead with multiple electrodes for supplying current to a ribbon, the electrode voltage levels for a plurality of nonadjacent electrodes are combined to provide a resultant voltage level that is examined to detect abnormalities. By so combining voltages, insignificant excursions in electrical characteristics as might result from minor ribbon imperfections are generally eliminated from the triggering of a shutdown response, while still retaining a rapid response for preventing further heat generation in those situations where a serious ribbon failure has occurred.

公开(公告)号：DE3162985D1

公开(公告)日：1984-05-10

申请号：DE3162985

申请日：1981-10-20

Applicant: IBM

Inventor： DYER STANLEY ,  MOLLOY JAMES JOHN ,  WALKER DONALD ABBOTT

IPC: B41J35/36

Abstract: In a printer that uses a prithead (22 min ) with multiple electrodes (56) for supplying current to a ribbon (24 min ), the electrode voltage levels for a plurality of non-adjacent electrodes are combined to provide a resultant voltage level that is examined in threshold detector (72) to detect abnormalities. By so combining voltages, insignificant excursions in electrical characteristics as might result from minor ribbon imperfections are generally eliminated from the triggering of a shutdown response, while still retaining a rapid response for preventing further heat generation in those situations where a serious ribbon failure has occurred.

公开(公告)号：DE3573563D1

公开(公告)日：1989-11-16

申请号：DE3573563

申请日：1985-07-12

Applicant: IBM

Inventor： CROLEY DONALD FRED ,  DYER STANLEY

IPC: B41J29/36 ,  B41J29/373

Abstract: Ribbon (22) in thermal printing has an outer layer which adheres to printed characters of intermediate temperatures, lower than printing temperatures. The printhead (7) has a column of electrodes which sweep across the character area. Erase mode control (48) causes erase of the same character twice, first at a temperature level moderately more than the normal erase level and one at a temperature moderately less than the normal erase level. Erasure in that dual mode is generally effective even for extreme conditions of paper, environment and other influences.

公开(公告)号：DE3463473D1

公开(公告)日：1987-06-11

申请号：DE3463473

申请日：1984-08-10

Applicant: IBM

Inventor： BARTLETT JOHN CROCKETT ,  BOHNHOFF ALAN EARL ,  CROLEY DONALD FRED ,  DYER STANLEY ,  EDDS KENNETH EUGENE ,  HORLANDER FRANK JAMES ,  STAFFORD DONALD WAYNE

IPC: B41J2/325 ,  B41J29/36 ,  B41J29/373 ,  B41M5/26 ,  B41J3/20

Abstract: Ribbon (22) in thermal printing has an outer layer which adheres to printed characters at intermediate temperatures, lower than printing temperatures. The printhead (7) has a column of electrodes (9) which sweep across the character area. Lift-off is accomplished by the pattern control (40) controlling the current source (38) to provide rapid, square wave pulses displaced in phase 180 degrees at adjoining electrodes (9). The high level of the pulses is about that of the level at printing, and the pulses are sufficiently rapid so that their net effect is to raise the outer layer ribbon (22) to the intermediate temperature. At areas corresponding to underlines of characters, duration of the up period is longer. Good, long term reliability is achieved by the significant erase level being very close to the print level.