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Fixing device and image forming apparatus

An image and fixing part technology, applied in the direction of electric recording process applying charge pattern, equipment of electric recording process applying charge pattern, electric recording technique, etc. Problems such as the difference in linear speed between the fixing nip and the correction nip, to prevent paper jams and correct the bending

Active Publication Date: 2011-04-20
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the prior art, regardless of the image forming apparatus disclosed in Patent Document 1 or Patent Document 2, although the temperature of the correction roller is affected by the recording medium heated in the fixing nip and the temperature changes, it does not Consider the thermal expansion of the straightening roll
And the change of thermal expansion of the straightening roller may cause the change of the linear speed in the straightening nip
As a result, the linear velocity difference between the fixing nip and the straightening nip cannot be kept constant, and paper jams may occur.

Method used

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  • Fixing device and image forming apparatus
  • Fixing device and image forming apparatus
  • Fixing device and image forming apparatus

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no. 1 approach

[0097] The following reference Figure 1 to Figure 11 , the image forming apparatus according to the first embodiment of the present invention will be described.

[0098] First, the configuration of the image forming apparatus will be described.

[0099] Such as figure 1 As shown, the image forming apparatus 1 includes: a document reading unit 2 for reading an image on a document; a paper feeding unit 4 for supplying a sheet 6a as a recording medium, and the sheet 6a is located in a plurality of stacked sheets. The uppermost sheet among the sheets 6; the image forming section 3 for forming an image read by the document reading section 2 on the sheet 6a of the paper feeding section 4; and the fixing device 10 for forming the image on the sheet 6a. The unfixed image formed in section 3 is fixed. In the image forming apparatus 1 of this embodiment, the image forming unit 3 and the paper feeding unit 4 can be separated.

[0100] The image forming unit 3 includes four image for...

no. 2 approach

[0196] The following reference Figure 12 An image forming apparatus according to a second embodiment of the present invention will be described.

[0197] The image forming apparatus of the second embodiment is substantially the same in structure as the image forming apparatus of the first embodiment. For each component, use the Figure 1 to Figure 5 The first embodiment shown will be described with the same symbols, and only the differences will be described in detail.

[0198] The straightening mechanism 40 includes a heating roller 41 and an elastic roller 46 contacting the heating roller 41 with pressure. A PFA layer may be formed on the surface of the heating roller 41 . Here, the heating roller 41 of this embodiment constitutes the heating roller portion 49 . Accordingly, the heating roller portion 49 can be heated by electromagnetic induction of the magnetic flux generated by the magnetic flux generating device.

[0199] The induction heating unit 30 is provided in...

no. 3 approach

[0203] see below Figure 13 An image forming apparatus according to a third embodiment of the present invention will be described.

[0204] The image forming apparatus of the third embodiment is substantially the same in structure as the image forming apparatus of the second embodiment. figure 2 The first embodiment shown will be described with the same symbols, and only the differences will be described in detail.

[0205] The core part 32 of the induction heating part 30 further has the separation core 32f in addition to side core 32a, 32b, center core 32e, arch core 32c, 32d. The separation core 32 f is provided in the vicinity of an intermediate surface between the fixing sleeve 22 and the heating roller 41 . The split core 32 f protrudes toward the coil guide 33 to separate a portion of the excitation coil 31 near the fixing sleeve 22 from a portion near the heating roller 41 . The separation core 32f of this embodiment constitutes the protruding member of the present...

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Abstract

The present invention provides a fixing device and an image forming apparatus, which prevents paper jam and performs bending correction for the recording medium. The fixing device (10) comprises the following components: a fixing section (20) which heats the toner image placed on a sheet member (6a) and fixes on the sheet member (6a); a correction mechanism (40) which corrects the bending of the sheet member (6a) that passes through the fixing section (20), and comprises an induction fixing section (30) that is provided next to the fixing section (20) and the correction mechanism (40) for generating magnetic beam, while the fixing section (20) comprises a fixing roller (21) that is heated by the electromagnetic induction caused by the magnetic beam generated by the induction fixing section (30); a pressing roller (23) which contacts the fixing roller (21) through pressure, while the correction mechanism comprises a heating roller section (48) which is heated by the electromagnetic induction caused by the magnetic beam generated by the induction fixing section (30); and an elastic roller (46) which contacts the heating roller section (48) through pressure.

Description

technical field [0001] The present invention relates to a fixing device and an image forming device, and more specifically, to a fixing device and an image forming device for fixing an image to a recording medium by using a fixing roller heated by electromagnetic induction heating. Background technique [0002] In existing image forming apparatuses, such as copiers, facsimile machines, printers, or printing machines, a fixing device is used to heat and fix an unfixed image transferred to a recording medium to produce copies or prints. [0003] In this heating and fixing, the recording medium on which the unfixed image is placed is heated by a fixing nip portion composed of a fixing member such as a fixing roller or a fixing belt, and a pressure roller contacting the fixing member with pressure, and the recording medium on which the unfixed image is placed is nip-conveyed. A medium that melts and softens a developer such as toner that forms an unfixed image, and penetrates in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/20G03G15/00
CPCG03G2215/00776G03G15/2085G03G2215/00662G03G15/2053G03G15/6576G03G15/2028
Inventor 长谷岳诚江原正尚石井贤治小川祯史上野智志瀬尾洋今田高广
Owner RICOH KK
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