Image forming apparatus

Details Image forming apparatus Image forming apparatus

2005-01-25

2005-01-25

Tran, Hoan (Department: 2852)

Electrophotography

Internal machine environment

Forced air circulation

C399S093000

Reexamination Certificate

active

06847795

ABSTRACT:
Provided is an image forming apparatus that is capable of reducing noise ascribable to wind noise of fans by performing control of the rotation speed of each cooling fan even during a print process. After power-on at timing T0, when a fixing temperature reaches a waiting temperature (timing T1) or after a print process is finished (timings T3, T6, and T9), a laser printer1enters a ready mode and a sub-fan and a power supply fan are driven to rotate at middle speed. From the start of a print process performed for the first time (timing T2), until timing T5at which a counter X has counted four minutes, each fan is driven to rotate at middle speed during the print process (timings T2to T3and T4to T5). After the, each fan is driven to rotate at high speed (timings T5to T6and T8to T9). Then, when a counter Y has counted a time period set for the ready mode and then a counter Z has counted a time period set for a sleep mode, the counter X is reset. Following this, the counter X restarts counting when a print process is started for the first time after the resetting.

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