IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0985637
(2011-01-06)
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등록번호 |
US-8433235
(2013-04-30)
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우선권정보 |
JP-2010-007165 (2010-01-15) |
발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
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인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
A fixing device, in which an unfixed image carried by a recording medium is passed through a fixing nip part being pressed by a fixing rotative body and a pressuring rotative body, and is fixed to the recording medium, is disclosed, including: a pressing part, and control part. The pressing part app
A fixing device, in which an unfixed image carried by a recording medium is passed through a fixing nip part being pressed by a fixing rotative body and a pressuring rotative body, and is fixed to the recording medium, is disclosed, including: a pressing part, and control part. The pressing part applies a pressure to the fixing nip part. The control part controls the pressure to be applied to the fixing nip part by the pressing part, to be lower than a case in which the recording medium passes through a curl correcting part for correcting a curl of the recording medium, when the recording medium does not pass through the curl correcting part.
대표청구항
▼
1. A fixing device comprising: a fixing rotative body;a pressuring rotative body configured to form a fixing nip part between the pressuring rotative body and the fixing rotative body by contacting the fixing rotative body;a heating part configured to heat at least one of the fixing rotative body an
1. A fixing device comprising: a fixing rotative body;a pressuring rotative body configured to form a fixing nip part between the pressuring rotative body and the fixing rotative body by contacting the fixing rotative body;a heating part configured to heat at least one of the fixing rotative body and the pressuring rotative body;a pressing part configured to apply a pressure to the fixing nip part; anda control part configured to control the pressure to be applied to the fixing nip part by the pressing part, to be lower than a case in which a recording medium passes through a curl correcting part for correcting a curl of the recording medium, when the recording medium does not pass through the curl correcting part,wherein an unfixed image carried by the recording medium is passed through the fixing nip part being pressed by the fixing rotative body and the pressuring rotative body, and is fixed to the recording medium. 2. The fixing device as claimed in claim 1, further comprising: an information input part configured to input selection information indicating whether or not the recording medium passes through the curl correcting part,wherein said control part determines whether or not the recording medium passes through the curl correcting part based on the selection information input to the information input part. 3. The fixing device as claimed in claim 2, wherein said information input part inputs a fixing mode for determining a paper type of the recording medium as the selection information, and said control part determines whether or not the recording medium passes through the curl correcting part based on the fixing mode input to the information input part. 4. The fixing device as claimed in claim 1, further comprising an image information detecting part configured to detect image information of the unfixed image, wherein said control part determines whether or not the recording medium passes through the curl correcting part based on the image information detected by said image information detecting part. 5. The fixing device as claimed in claim 1, further comprising a fixing speed detecting part configured to detect a setting value of a fixing speed at which the recording medium passes through the fixing nip part, wherein said control part determines whether or not the recording medium passes through the curl correcting part based on the fixing speed detected by said fixing speed detecting part. 6. The fixing device as claimed in claim 1, further comprising a grammage detecting part configured to detect a grammage of the recording medium, wherein said control part controls the pressure of the fixing nip part to be lower than a case in which the grammage of the recording medium detected by said grammage detecting part is equal to or less than a predetermined grammage, when the grammage of the recording medium is greater than the predetermined grammage. 7. The fixing device as claimed in claim 1, further comprising a sheet thickness detecting part configured to detect a sheet thickness of the recording medium, wherein said control part controls the pressure of the fixing nip part based on the sheet thickness of the recording medium detected by said sheet thickness detecting part, without steps. 8. The fixing device as claimed in claim 1, wherein said fixing rotative body includes a heat generating layer for generating heat by electromagnetic induction, and said heating part generates a magnetic flux so that the heat generating layer of the fixing rotative body generates heat due to electromagnetic induction. 9. The fixing device as claimed in claim 1, wherein said heating part generates a heating amount greater than the case in which the pressure is not controlled to be lower, when the control part controls the pressure of the fixing nip part to be lower. 10. The fixing device as claimed in claim 1, wherein said control part adjusts the pressure to be a pressure of a case of passing through the curl correcting part, after a preparation of a fixing operation is completed or after a fixing operation ends. 11. The fixing device as claimed in claim 1, wherein said pressuring part includes a cam for changing the pressure of the fixing nip part by pressing the pressure rotative body, a filler which has a cut-off and rotates in association with the cam, and a photosensor for detecting the filler, wherein said control part controls a rotation angle of the cam based on a presence or an absence of detecting the filler by the photosensor. 12. The fixing device as claimed in claim 11, wherein said control part controls the rotation angle of the cam after detecting a switch between the presence and the absence of detecting the filler by the photosensor, when changing the pressure of the fixing nip part. 13. The fixing device as claimed in claim 11, wherein said control part controls rotation directions of the cam to be one direction, so that the pressure is changed by reducing a rotation speed of the cam in a case of reducing the pressure of the fixing nip part. 14. The fixing device as claimed in claim 11, wherein said cam includes statary sections in response to pressure stages, and curve sections for switching a pressure amount. 15. An image forming apparatus including a fixing device comprising: a fixing rotative body;a pressuring rotative body configured to form a fixing nip part between the pressuring rotative body and the fixing rotative body by contacting the fixing rotative body;a heating part configured to heat at least one of the fixing rotative body and the pressuring rotative body;a pressing part configured to apply a pressure to the fixing nip part; anda control part configured to control the pressure to be applied to the fixing nip part by the pressing part, to be lower than a case in which a recording medium passes through a curl correcting part for correcting a curl of the recording medium, when the recording medium does not pass through the curl correcting part,wherein an unfixed image carried by the recording medium is passed through the fixing nip part being pressed by the fixing rotative body and the pressuring rotative body, and is fixed to the recording medium.
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