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Fixing device and image forming apparatus

A detection device and a rotating body technology, applied in the fields of fixing devices and image forming devices, can solve problems such as changes in separation performance, and achieve the effects of stabilizing separation performance and preventing accidental changes

Inactive Publication Date: 2010-12-01
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the separation member is moved, if the radial relative position between the separation member and the fixing rotor, etc. changes, causing the above-mentioned distance variation, the separation performance may change unpredictably.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Figure 7 as well as Figure 8 The characteristic portion of the above-mentioned fixing device 19, that is, the structure of Embodiment 1 of the present invention is shown. Figure 7 is a side view of the fixing device 19, Figure 8 It is a front view of the fixing roller 20 and the separation plate 43 viewed from the pressure roller 30 side.

[0106] Such as Figure 7 as well as Figure 8 As shown, the separation plate 43 is supported by a rotation holding member 44 mounted on the rotation shaft 200 of the fixing roller 20 . The rotation holding member 44 includes a holding portion 441 for supporting the separation plate 43 and a pair of arm portions 442 provided at both ends of the holding portion 441 . The pair of arm portions 442 are rotatably mounted on the rotation shaft 200 of the fixing roller 20 via bearings 45 , respectively. In this way, the separation plate 43 can rotate around the rotation axis of the fixing roller 20 . Also, the front end 430 of the...

Embodiment 2

[0114] Figure 9 and Figure 10 The structure of the fixing device of Embodiment 2 of the present invention is shown. Figure 9 and Figure 10 neutralize Figure 7 and Figure 8 The same symbols in represent the same components or the same parts.

[0115] The fixing device 19 of the second embodiment differs from the fixing device of the first embodiment described above in the structure of the separation plate 43 and the rotation holding member 44 for supporting the separation plate 43 . detailed as Figure 9 and Figure 10 As shown, the rotation holding member 44 is provided with a holding portion 441 on which the separation plate 43 is installed, and a pair of arm portions 442 rotatably arranged on the rotation shaft 200 of the fixing roller 20, and the holding portion 441 is rotatably installed on The pivot point 443 on the pair of arm parts 442 . When the holding part 441 rotates around the fulcrum, the separation plate 43 swings in the direction of the arrow in th...

Embodiment 3

[0119] Figure 11 to Figure 13 The structure of the fixing device according to Embodiment 3 of the present invention is shown.

[0120] In the fixing device 19 of the third embodiment, both the fixing roller 20 and the pressure roller 30 are provided with separation plates 43A and 43B, respectively. In this case, the recording medium can be separated from both the fixing roller 20 and the pressure roller 30 by the two separating plates 43A and 43B. Especially in an image forming apparatus equipped with a double-sided printing function, when the image is fixed, since the toner images transferred to the front and back sides of the recording medium contact the fixing roller 20 and the pressure roller 30 respectively, the two sides can be used to fix the image. The separation plates 43A and 43B are used to effectively prevent the recording medium from wrapping around the fixing roller 20 and the pressure roller 30 .

[0121] The separation plates 43A and 43B are supported by rot...

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PUM

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Abstract

The invention relates to a fixing device and an image forming apparatus having the same. The object of the invention is to keep a radial opposite position relationship between a separation member and a rotary member constant and perform the perimeter movement of the separation member. The fixing device concretely comprises a pair of rotary members (20,30) and a nip (N) is formed between the pair of the rotary members (20,30) by the recording medium to fix the image on the recording medium, wherein a separation member is rotatably arranged on a rotation axle (200) of the rotary member (20) and used for separating the recording medium of the nip (N) from the rotary member (20) and comprises a rotation angle adjuster (46) for adjusting the rotation angle of the separation member (43).

Description

technical field [0001] The present invention relates to a fixing device for fixing an image on a recording medium, and an image forming device including the fixing device. Background technique [0002] In image forming apparatuses such as copiers, printers, facsimile machines, and multifunctional multifunction machines that have the functions of these apparatuses, heat and pressure are often used to process toner images transferred onto recording media such as paper. Fixing unit for fixing. In this type of fixing device, the recording medium passes through the nip formed between the fixing rotor and the pressing rotor, the toner on the recording medium is heated and melted, and the image is fixed. [0003] However, in the above-mentioned thermal fixing system fixing device, the following problems may occur, that is, the molten toner on the recording medium adheres to the fixing rotor, so that the recording medium is wound on the fixing rotor, or the image is skewed, etc. b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/20
CPCG03G15/2085G03G15/2007G03G15/2028
Inventor 小川祯史江原正尚石井贤治上野智志瀬尾洋
Owner RICOH KK
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