- 专利标题: Fixing device including mechanism for varying pressure at nip region between rotary body and pressure body
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申请号: US17211360申请日: 2021-03-24
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公开(公告)号: US11327424B2公开(公告)日: 2022-05-10
- 发明人: Hiroshi Handa , Tokifumi Tanaka , Shuhei Fukue , Tomonori Watanabe
- 申请人: BROTHER KOGYO KABUSHIKI KAISHA
- 申请人地址: JP Nagoya
- 专利权人: BROTHER KOGYO KABUSHIKI KAISHA
- 当前专利权人: BROTHER KOGYO KABUSHIKI KAISHA
- 当前专利权人地址: JP Nagoya
- 代理机构: Merchant & Gould P.C.
- 优先权: JPJP2019-115108 20190621
- 主分类号: G03G15/20
- IPC分类号: G03G15/20
摘要:
A fixing device includes: a rotary body; a pressure body; a frame supporting the rotary body; and a pressure varying mechanism for providing a nip pressure to a nip region formed between the rotary body and the pressure body. The pressure varying mechanism includes a first spring and a second spring for urging one of the rotary body and the pressure body. The first spring applies a first urging force, and the second spring applies a second urging force acting in an opposite direction from the first urging force. The pressure varying mechanism can vary the nip pressure between a first nip pressure and a second nip pressure smaller than the first nip pressure. The nip pressure becomes the first nip pressure while only the first urging force is applied, and becomes the second nip pressure while both of the first urging force and the second urging force are applied.