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Fixing device, fixing method, and recording apparatus
| Details |
Inventors: Mitsuya, Teruaki;
Assignee: Hitachi, Ltd. (Tokyo, JP); Hitachi Koki Co., Ltd. (Tokyo, JP)
Primary Examiner: Brase; Sandra L.
Assistant Examiner:
Attorney, Agent or Firm: Antonelli, Terry, Stout & Kraus
A fixing device for fixing the toner on the recording medium comprising a pair of fixing rollers which face each other and rotate in opposite direction to form a nipping and fusing section for toner fixing, with at least one of the rollers internally provided with a heating element, and a recording medium guiding device for changing the length of contact area of the recording medium to the fixing roller with heating element in accordance with the recording medium thickness, which is provided at the downstream side extending from the nipping and fusing section. This allows the device to be reduced in size and the fixing strength to be increased independent of the recording medium thickness. |
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DETAILED DESCRIPTION An object of the present invention is to provide a fixing device having a small-sized heat roller having a long life, and which prevents image slippage from occurring, which is made possible by removing the preheater.
Another object of the present invention is to allow the toner to be fixed with sufficient strength onto the recording medium regardless of the medium's thickness.
Still another object of the present invention is to allow the temperature drop of the central portion of the heat roller in the fixing device to the controlled when printing is performed successively for a long period of time to prevent fixing failure thereof.
A further object of the present invention is to prevent misprinting and image loss caused by toner stick from occurring.
To these ends, there is provided according to one aspect of the invention a fixing device in which a recording medium to be transported is nipped to fix the toner image formed thereon.
The device comprises a pair of rotatable rollers which face each other, with at least one of the rollers internally provided with a heating element, the pair of fixing rollers press-contacting the recording medium to form a nipping and fusing section for fixing the toner image.
It also comprises a recording medium guiding means for changing the length of the contact area of the recording medium to the outer periphery of the fixing roller with heating element in accordance with the recording medium thickness, which is provided at the downstream side from the nipping and fusing section formed by the fixing rollers.
The recording medium guiding means is made up of a recording medium guiding roller and a rotatable supporting arm and the rotating angle of its supporting arm can be set to a predetermined value in accordance with the recording medium thickness.
In addition, a control means may be provided for automatically setting the rotating angle of the supporting arm in accordance with the recording medium thickness.
The fixing roller with heating element is an aluminum hollow cylinder, which is called a core metal, whose outer periphery is coated with a parting layer of fluorocarbon resin material, with a halogen lamp used for the heating element
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