Toner image fixing apparatus for an image forming machine

Details Toner image fixing apparatus for an image forming machine Toner image fixing apparatus for an image forming machine

1989-05-25

1990-04-03

Grimley, Arthur T.

Photocopying

Contact printing

Light boxes

219216, 355285, 432 60, G03G 520

Patent

active

049144847

ABSTRACT:
In a toner image fixing apparatus for an image forming machine, toner image transferred on a paper is heated at a predetermined fixing temperature. The fixing temperature is set to be larger than or equal to the toner melting temperature plus 10 [.degree.C.], and smaller than or equal to the toner melting temperature plus 20 [.degree.C.], in order to prevent rumples from forming on the paper. The paper is run at a predetermined speed slightly lower than the transfer speed of 60 mm/sec or less. Two cylindrical rollers are used to press the paper. The hardness of the surface of one of the rollers is set at 40.degree. or more. The fixing length of the portion where the rollers are in contact with one another is set at 2.5 mm or less. The distance between the fixing apparatus and the edge of a guide plate is set to be larger than or equal to 0.2 times the diameter of one of the rollers. Another aspect of the invention is setting the fixing speed higher than or equal to 1.005 times transfer speed, and lower than or equal to 1.02 times the transfer speed.

REFERENCES:
patent: 3706491 (1972-12-01), Furman et al.
patent: 4188109 (1980-02-01), Idenawa et al.
patent: 4780742 (1988-10-01), Takahashi et al.
patent: 4812873 (1989-03-01), Inagaki et al.
patent: 4843214 (1989-06-01), Higashi et al.

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