Hot roll fuser early closure inhibitor

Details Hot roll fuser early closure inhibitor Hot roll fuser early closure inhibitor

1977-10-06

1979-07-31

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

219216, 355 3FU, 432 60, G03G 1500, F27B 928

Patent

active

041628470

ABSTRACT:
A heated fuser roller and backup roller fix toner on a sheet passing therebetween. These rollers are separated during nontoner fixing periods and normally closed for a predetermined early closure period prior to arrival of a sheet at the nip between the rollers. The immediate past history of fusing activity is monitored to determine whether the early roll closure is to be inhibited, a situation existing whenever the immediate past history indicates that steps must be taken to prevent backup roller overheating. The past history monitoring is performed by direct backup roller temperature sensing, timeout circuit operation or the like.

REFERENCES:
patent: 3357249 (1967-12-01), Bernous et al.
patent: 3754819 (1973-08-01), Braun
patent: 3794417 (1974-02-01), Machmer
patent: 3809475 (1974-05-01), Post et al.
patent: 3851144 (1974-11-01), Hutner
Ernst et al; "Heater Control Circuit", IBM Technical Disclosure Bulletin, Oct., 1972, vol. 15, No. 5, p. 1587.
Gaitten et al, "Pressure Roll Support", IBM Technical Disclosure Bulletin, May 1973, vol. 15, No. 12, p. 3644.
Brandon et al, "Dry Hot Roll Fuser Having Early Fusing Nip Closure", Jun. 1, 1976.

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