Michael H Headrick

US Patent:

43781527, Mar 29, 1983

Filed:

Jan 31, 1977

Appl. No.:

5/764254

Inventors:

Earl G. Edwards - Boulder CO
Michael R. Headrick - Boulder CO

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G03G 1520

US Classification:

355 3FU

Abstract:

Fusing of a toned sheet of copy paper is accomplished by a fusing nip formed by a resilient hot roll and a rigid backup roll. The sheet is introduced to the fusing nip in a unique manner such that the sheet's initial contact to the hot roll fuser is substantially only a point on the sheet's leading edge. This is accomplished by orientation means operable to bow the sheet's leading edge, and/or to produce skew between the fusing nip and the sheet's leading edge.

US Patent:

41545753, May 15, 1979

Filed:

Aug 22, 1977

Appl. No.:

5/826619

Inventors:

Earl G. Edwards - Boulder CO
Michael R. Headrick - Boulder CO
Charles E. Peterson - Boulder CO

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H05B 310
G03G 500

US Classification:

432 60

Abstract:

An apparatus which provides for a constant center distance between all drive components in a hot roll fusing assembly during fusing nip opening/closing. This apparatus includes a roll closure device which utilizes a high mechanical advantage toggle mechanism in conjunction with a cam drive. The toggle mechanism is comprised of a pivot arm pinned to the fuser frame and a force-cell attached to the pivot arm and the shaft through the backup roll. The backup roll is constrained to rotate about the cam shaft. When the cam rotates, it rotates the pivot arm, which in turn drives the backup roll either towards or away from the hot roll while maintaining a constant center distance between the backup roll center line and a center line through the cam shaft. The drive means for the backup roll includes a first gear drivingly coupled thereto which rotates on the same axis and which meshes with a second gear rotating on the same shaft as the cam. Thus, with power input at the cam shaft, the backup roll is driven with minimum backlash by gears whose center distance is constant regardless of backup roll position.

US Patent:

46721770, Jun 9, 1987

Filed:

Nov 12, 1985

Appl. No.:

6/797290

Inventors:

Michael R. Headrick - Boulder CO

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G03G 1520

US Classification:

219216

Abstract:

The quality of toner fusing in an electrophotographic or xerographic copier or printer is improved by modifying the reference voltage employed, in conjunction with the fuser hot roll temperature sensing, with a factor correlated to the temperature sensed in the environment of the fuser assembly. In a typical embodiment, the environment temperature is used to develop the reference voltage applied for comparison with the signal from a direct hot roll temperature thermistor. Thus, the temperature set point toward which the hot roll is driven varies as a function of the environment temperature for the fuser assembly.

US Patent:

43186122, Mar 9, 1982

Filed:

Jul 10, 1980

Appl. No.:

6/168825

Inventors:

Robert C. Brannan - Longmont CO
Robert J. Fogoros - Boulder CO
Michael R. Headrick - Boulder CO
Ainis Krumins - Erie CO
Robert F. Pryor - Boulder CO

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G03G 1500

US Classification:

355 14FU

Abstract:

The temperature of a hot roll xerographic fuser is controlled by a control system which compares a command set point temperature to the fuser's actual temperature and energizes a fuser heater accordingly. A cold start of the fuser is distinguished from a warm start, and the command set point temperature is magnitude-programmed accordingly.