Fixing device for image forming apparatus to control power of heating source while in a warming-up mode
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsOsamu Takagi, Satoshi Kinouchi, Yoshinori Tsueda, Toshihiro Sone
Life of this patent
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Abstract
A fixing device of this invention enables variable control of power to be supplied to a heat roller side or a press roller side in accordance with the temperature of the heat roller and the press roller while each mode is carried out. In a copy mode, the temperature of the heat roller and the press roller is finely controlled. In a copy standby mode, only the power required for maintaining a set temperature is supplied.
Claims20
A heating device for an image forming apparatus comprising:
- an image-side rotating member;
- a non-image-side rotating member for nipping and carrying a heating target medium having a toner image thereon into a predetermined direction together with the image-side rotating member;
- a first heating source which is supplied with power by using a commercial power source for heating the image-side rotating member;
- a second heating source which includes at least two lamp heaters and is supplied with power by using a commercial power source for heating the non-image-side rotating member;
- and
- a control unit for controlling power supplied to the first heating source and the second heating source while in a warming-up mode, the control unit supplies power to the first heating source until the first heating source has received a maximum quantity of power permitted for the first heating source, and after the first heating source has received the maximum quantity of power permitted, the control unit supplies power to the second heating source.
A heating device for an image forming apparatus comprising:
- image-side rotating member for heating a side of a heating target medium on which a toner image is formed;
- non-image-side rotating member for nipping and carrying the fixing target medium into a predetermined direction together with the image-side rotating member, and contacting a side of the fixing target medium on which the toner image is not formed;
- first heating source for heating the image-side rotating member;
- second heating source for heating the non-image-side rotating member;
- and
- a control unit for controlling power supplied to the first heating source and the second heating source so that a sum value of the power supplied does not exceed a prescribed power value of a commercial power source while in the warming up mode, and the control unit supplies power to the first heating source until the first heating source has received a maximum quantity of power permitted for the first heating source, and after the first heating source has received the maximum quantity of power permitted, the control unit supplies power to the second heating source.
A control method of a heating device for an image forming apparatus comprising:
- carrying a heating target medium having a toner image thereon into a predetermined direction with an image-side rotating member heated by a first heating source and a non-image-side rotating member heated by a second heating source which includes at least two lamp heaters;
- controlling power supplied to the first heating source and to the second heating source while in a warming-up mode, including supplying power to the first heating source until the first heating source has received a maximum quantity of power permitted for the first heating source, and after the first heating source has received the maximum quantity of power permitted, supplying power to the second heating source.
Dependencies are inferred from the claim text.