Fixing device and image forming apparatus including fixing device
A technology of endless belt and exciting coil, which is applied in the field of image forming device and fixing device of electromagnetic induction heating method, and can solve problems such as increasing the diameter of the drive shaft, increasing the rigidity of the magnetic flux shielding part, and difficulty in miniaturizing the device
Inactive Publication Date: 2014-06-11
KYOCERA DOCUMENT SOLUTIONS INC
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Problems solved by technology
However, when the thickness of the shielding layer is increased, the rigidity of the magnetic flux shielding member is increased, and it becomes difficult to bend, thereby restricting the movement of the magnetic flux shielding member at a portion where the radius of curvature on the moving path of the magnetic flux shielding member is small.
Therefore, it is necessary to increase the diameter of the drive shaft, tension shaft, and support shaft, making it difficult to miniaturize the device.
Method used
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Embodiment Construction
[0031] Embodiments of the present invention will be described below with reference to the drawings.
[0032] refer to Figure 1-Figure 10 , the image forming apparatus according to the first embodiment of the present invention will be described. The image forming apparatus 1 includes a paper feeding unit 2 , a paper conveying unit 3 , an image forming unit 4 , a fixing device 5 , and an image reading unit 6 . The paper feeding unit 2 is arranged below the image forming apparatus 1 , and the paper conveying unit 3 is arranged on the side of the paper feeding unit 2 . The image forming unit 4 is disposed above the paper conveyance unit 3 , and the fixing device 5 is disposed on the paper discharge side of the image forming unit 4 . Image reading unit 6 is disposed above image forming unit 4 and fixing unit 5 .
[0033] The paper feeding unit 2 has a plurality of paper feeding cassettes 7 for storing paper P as a recording medium, and the paper P is selected from the paper fee...
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A fixing device includes a heating member pressed by a pressing member to form a nip part, an excitation coil generating a magnetic flux induction-heating the heating member, a magnetic core and a magnetism shielding member. The magnetic core is located opposite to the heating member across the excitation coil and provides a magnetic path passing through the excitation coil and heating member. The magnetism shielding member partially shields the magnetic path and includes a rotatable belt member allowing the magnetic flux to pass through, and a magnetism shielding layer arranged on a surface of the belt member. In the magnetism shielding layer, gap parts extending in a width direction of the belt member are arranged along a circumference direction of the belt member. When the magnetism shielding member is located to shield the magnetic path, inner wall faces of the gap part are brought into contact with each other.
Description
technical field [0001] The present invention relates to a fixing device and an image forming device having the fixing device, in particular to an electromagnetic induction heating method fixing device and an image forming device having the fixing device. Background technique [0002] The fixing device of the electromagnetic induction heating method uses the magnetic flux generated by the excitation coil to generate eddy current in the induction heating layer installed in the heating part, and the Joule heat generated by the eddy current makes the induction heating layer heat up, thereby heating the heating part to a specified fixing temperature. temperature. In this kind of fixing device, since the heat capacity of the induction heating layer can be made smaller, the warm-up time when the fixing device is started can be shortened, and a higher heat conversion rate can be obtained with a relatively compact structure. However, when the size of the paper to be fixed is small, ...
Claims
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IPC IPC(8): G03G15/20
CPCG03G15/2042G03G15/2053
Inventor 薄井将吾石井智士辰巳英二
Owner KYOCERA DOCUMENT SOLUTIONS INC