Toner image fixing apparatus capable of keeping constant fixing roller temperature
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 30, 2001
Grant Date -
N/A
app pub date -
Mar 11, 1999
filing date -
Jun 1, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A toner image fixing apparatus has a fixing roller, a pressing roller, and a heating roller. The pressing roller is normally urged toward the fixing roller for pressing a sheet with an unfixed toner image carried on a surface thereof against the fixing roller to fix the unfixed toner image to the sheet when the sheet passes in one direction through a rolling contact region between the fixing roller and the pressing roller. The heating roller is disposed on one side of the fixing roller opposite to the pressing roller. A first heat source is disposed in the heating roller for heating the heating roller, and a second heat source is disposed in the pressing roller for heating the pressing roller. An endless heat transfer belt is trained around the heating roller and the fixing roller for transferring heat from the first heat source to heat the unfixed toner image on the sheet when the sheet passes through the rolling contact region. When the apparatus is in a standby mode, a controller energizes the first heat source and the second heat source. When the apparatus is in the sheet feed mode, the controller energizes the first heat source, and also energizes the second heat source only if the sheet is of a size larger than a predetermined size.
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