Fusing apparatus having automatic nip width adjustment mechanism

Details Fusing apparatus having automatic nip width adjustment mechanism Fusing apparatus having automatic nip width adjustment mechanism

1989-09-05

1990-11-20

Grimley, A. T.

Photocopying

Contact printing

Light boxes

219216, 355282, G03G 1520

Patent

active

049722328

ABSTRACT:
A roller type fusing apparatus, in which a fuser or pressure roller is movable, includes a device for forming a fusing nip, having a desired nipwidth, by moving the movable roller from a first light surface-to-surface contact position, to a compressing and deforming contact second position with the other roller. The fusing apparatus further includes a mechanism for automatically correcting or adjusting for fusing nipwidth misadjustments which are caused by a reduction in the size of any of rollers. Such misadjustments normally result in poor and unacceptable fusing quality due to the nipwidth of subsequently formed fusing nips being undesirably narrower than the desired nipwidth setting. The mechanism includes a displacement assembly, operative with the nip forming device, for automatically displacing the movable roller from a misadjusted gapped or spaced third position back to the adjusted, light surface-to-surface contact first position, prior to formation of a fusing nip. In this manner, the formation of a fusing nip that has the desired nipwidth is ensured.

REFERENCES:
patent: 3809861 (1974-05-01), Braun
patent: 3936658 (1976-02-01), Traister et al.
patent: 4147501 (1979-04-01), Goshima et al.
patent: 4269594 (1981-05-01), Umans et al.
patent: 4341458 (1982-07-01), Glasa et al.

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