Fixing device for image forming apparatus
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorKazuhiko Kikuchi
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Abstract
A fixing device according to an embodiment of the invention is provided with a center coil and a side coil to induction heat a metal roller which supports a belt. An auxiliary pressurizing member which is adjacent to an opposing roller which supports the belt and presses the belt against a heat roller is provided. The distance from the center position of induction heating of a heat roller to an entrance of a nip is equalized to the distance from the center position of induction heating of the metal roller to the entrance of the nip. The distance from the temperature reading position of the heat roller to the center position of induction heating of the heat roller is equalized to the distance from the temperature reading position of the belt to the center position of induction heating of the metal roller.
Claims17
A fixing device for an image forming apparatus comprising:
- a heat-generating member comprising a metal surface layer;
- a belt configured to contact the heat-generating member to form a nip;
- a plurality of rollers configured to support the belt rotatably;
- a pressing member configured to press the belt against the heat-generating member to form the nip;
- a first coil configured to generate an induction current on the heat-generating member at a first position on the heat-generating member a first distance from the nip;
- and
- a second coil configured to generate an induction current on the belt at a second position on the belt, and a second distance between a center of induction heating by the second coil and the nip is equal to the first distance between a center of induction heating by the first coil to the nip.
A method of controlling a fixing device comprising;
- forming a nip between a heat-generating member includes a metal belt as a surface layer and a belt;
- generating a first induction current on the heat-generating member at a first position on the heat-generating member a first distance from the nip;
- and
- generating a second induction current on the belt at a second position on the belt a second distance from the nip, wherein a time period from a timing when the heat-generating member is caused to generate heat by a first induction current to a timing when the heat-generating member reaches the nip matches the time period from a timing when the belt is caused to generate heat by the second induction current to a timing when the belt reaches the nip.
Dependencies are inferred from the claim text.