Electric heating – Heating devices – Combined with pressure application means
Patent
1989-08-23
1991-08-20
Grimley, A. T.
Electric heating
Heating devices
Combined with pressure application means
219216, 219470, 355208, 355282, 355285, 355290, D06F 7524, B21B 2706, H05B 302, G03G 1520
Patent
active
050417185
ABSTRACT:
A device for fixing a powder image on a receiving support using heat that consists of an image transfer roller internally provided with a first heating element having the same heat-generating power over the entire length of the image transfer roller, and a second heating element which has a higher heat-generating power in the edge zones of the image transfer roller than in the middle zone of the roller, and a pressure roller internally provided with a third heating element which like the second heating element has a higher heat-generating power in the edge zones than in the middle zone. The device may be in a warm-up condition in which the temperature of the rollers is not yet at the working level, stand-by condition in which the temperature is at the working level but in which no fixing is carried out, and a fixing condition in which fixing is carried out. During warm-up, all the heating elements generate the maximum power. During stand-by, the first heating element is switched off and the effective powers of the second and third heating elements are set to a much lower value, so that the ratio between the amount of heat generated in the edge zones and the amount of heat generated in the middle zone is greater than during warm-up. During fixing, the effective powers of all three heating elements are set to a higher value than during stand-by, but the ratio between the amount of heat generated in the edge zones and the amount of heat generated in the middle zone is lower than during stand-by.
REFERENCES:
patent: 4585325 (1986-04-01), Euler
patent: 4668075 (1987-05-01), Shigemura et al.
d'Hondt Arnold A. P. M.
Jaartsveld Rob F. M.
Barlow Jr. J. E.
Grimley A. T.
Oce'-Nederland, B.V.
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