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Image forming apparatus
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A technology of image and toner image, applied in the field of image forming device
Inactive Publication Date: 2011-06-22
KYOCERA DOCUMENT SOLUTIONS INC
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However, the inside of the heating roller is a high-temperature environment. When any components are arranged there, the Curie temperature must be set high, and the bigger problem is that components with large heat capacity will prolong the preheating time.
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no. 1 approach
[0071] The fixing unit 14 used in the first embodiment of the image forming apparatus 1 will be described in detail below.
[0072] figure 2 It is a longitudinal sectional view showing the structure of the fixing unit 14 of the first embodiment. exist figure 2 , shows a state where the fixing unit 14 mounted on the image forming apparatus 1 is rotated about 90° in the counterclockwise direction. Thus, in figure 1 The feeding direction from bottom to top in figure 2 from right to left. In addition, in the case where the device main body 2 is larger (such as a digital composite machine), it may be installed as figure 2 orientation shown.
[0073] The fixing unit 14 has the pressure roller 44 , the fixing roller 45 , the heating roller 46 , and the heating belt 48 as described above. As described above, since the pressure roller 44 is a metal roller, and the surface layer of the fixing roller 45 has an elastic layer of silicon sponge, a flat nip NP is formed between t...
Deformed example 1
[0115] Figure 7 It is a diagram showing a fixing unit 14A that is a first modified example of the fixing unit 14 of the first embodiment. In the fixing unit 14A, the toner image is fixed by the fixing roller 45A and the pressure roller 44 instead of the heating belt 48 . The IH coil unit 50 is arranged to face the peripheral surface of the fixing roller 45A.
[0116] On the outer circumference of the fixing roller 45A, for example, the same magnetic material as the heating belt is wound, and the magnetic material is inductively heated by an induction heating coil 52 . In this case, the thermistor 62 is provided at a position opposite to the magnetic layer on the outside of the fixing roller 45A. Others are the same as described above, and the shielding amount to the magnetic field can be adjusted by rotating the center core 58 .
Deformed example 2
[0118] Figure 8 It is a diagram showing a fixing unit 14B that is a second modified example of the fixing unit 14 of the first embodiment. Here, an example using a different IH coil unit 50A is shown. In this structural example, the IH coil unit 50A performs induction heating not at an arcuate position of the heating belt 48 but at a planar position between the heating roller 46 and the fixing roller 45 . In this case as well, by rotating the center core 58, the amount of shielding to the magnetic field can be adjusted.
[0119] Second embodiment of the fixing unit
[0120] Figure 9 It is a longitudinal sectional view showing the structure of the fixing unit 214 of the second embodiment. As described above, the fixing unit 214 includes the pressure roller 44 , the fixing roller 45 , the heating roller 46 and the heating belt 48 . These members are the same as those of the first embodiment, and description thereof will be omitted here.
[0121] Besides, the fixing uni...
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Abstract
An image forming apparatus has an image forming station and a fixing unit. The fixing unit includes a coil for generating a magnetic field for induction heating the heating member. A first core made of a magnetic material is arranged fixedly around the coil. A second core made of a magnetic material is between the first core and the heating member in a generation direction of the magnetic field to form a magnetic path in cooperation with the first core and capable of changing a posture thereof. A shield made of a nonmagnetic metal is arranged along the outer surface of the second core to shield magnetism in the magnetic field and a magnetic shielding portion for changing the posture of the second core between a first posture where the shield shields the magnetism and a second posture where the shield does not shield the magnetism. Thus, the apparatus can reduce heat capacity and preheating time and save space by reducing the members configured in the heating member.
Description
technical field [0001] The present invention relates to an image forming apparatus having a fixing unit including a heating member and a pressing member for passing a paper (sheet) carrying a toner image between the heating member and a pressing member, The unfixed toner is heated and melted to be fixed on the paper. Background technique [0002] In recent years, from the viewpoints of shortening the warm-up time in the fixing unit and saving energy, attention has been paid to adopting a belt system capable of reducing heat capacity in image forming apparatuses (for example, see Japanese Patent Laid-Open No. 6-318001). In addition, in recent years, the electromagnetic induction heating method (IH) that can heat quickly and efficiently has also attracted attention. From the perspective of energy saving during color image fixing, many products that combine the electromagnetic induction heating method and the belt method have been produced. In the case of combining the belt m...
Claims
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Application Information
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