Fixing device and image forming apparatus
A technology structured as a rotating body, applied in the fields of electromagnetic induction heating type fixing devices and image forming devices, capable of solving problems such as damage, insufficient prevention of non-sheet overheating, deterioration of surrounding members or magnetic flux shielding member 1021a, etc.
Inactive Publication Date: 2011-09-21
KONICA MINOLTA BUSINESS TECH INC
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Problems solved by technology
Therefore, due to overheating of the magnetic flux shielding member 1021a, surrounding members or the magnetic flux shielding member 1021a itself may be deteriorated or broken due to heat.
[0013] As described above, the above-mentioned prior art has various problems such as insufficient prevention of overheating of the non-paper passing area, or a negative effect of an increase in the size of the device.
Method used
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Embodiment Construction
[0028] Embodiments of the fixing device of the present invention will be described below with reference to the drawings, taking an image forming device as an example.
[0029] [1] Structure of image forming apparatus
[0030] First, the image forming apparatus of this embodiment will be described.
[0031] figure 1 The main structure of the image forming apparatus of this embodiment is shown. Such as figure 1 As shown, the image forming apparatus 1 includes a document reader 100 , an image forming section 110 and a feeder 120 . The document reader 100 optically reads documents and forms image data.
[0032] Image forming section 110 includes image forming units 111Y- 111K, controller 112 , intermediate transfer belt 113 , a pair of secondary transfer rollers 114 , fixing device 115 , discharge rollers 116 , discharge tray 117 , and cleaner 118 .
[0033] The image forming units 111Y to 111K respectively form toner images of yellow (Y), magenta (M), cyan (C) and black (K...
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The invention relates to a fixing device and an image forming apparatus. An excitation coil positioned along an axial direction of a fixing rotational body having a heat generating layer causes the heat generating layer to generate heat by electromagnetic induction. Magnetic flux shielding members positioned outside the excitation coil in a radial direction of the fixing rotational body cover at least one end of a maximum sheet passing region. A controller moves the magnetic flux shielding members along the excitation coil, and when a fed sheet has a width smaller than a width of the maximum sheet passing region, a center hole of the excitation coil is more widely covered. In a plan view, a circumference of each of the magnetic flux shielding members partially and obliquely crosses with the center hole in the axial direction of the fixing rotational body.
Description
technical field [0001] The present invention relates to an electromagnetic induction heating type fixing apparatus and an image forming apparatus, and particularly relates to a technique for preventing overheating of an area through which no recording paper passes, using a small, lightweight, and low-cost configuration. Background technique [0002] In recent years, an electromagnetic induction heating type fixing device having a low heat capacity has been actively developed due to its high power efficiency. However, there are the following problems. When recording paper having a small width (hereinafter referred to as "small-sized paper") is continuously fed to the fixing device, overheating occurs in temperature at an area where no recording paper passes (hereinafter referred to as "non-paper passing area"). This is because heat is absorbed by the small-sized paper in the area where the recording paper passes (hereinafter referred to as "paper-passed area"), but heat is n...
Claims
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IPC IPC(8): G03G15/20G03G15/00
CPCG03G15/2082G03G2215/2035G03G15/2042
Inventor 清水洋介
Owner KONICA MINOLTA BUSINESS TECH INC