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Color electrophotographic image forming apparatus

A technology of electrophotography and imaging devices, which is applied in the direction of transmission devices, electrical recording techniques, and electrical recording techniques using charge patterns, etc., which can solve the problems that hinder the miniaturization of imaging devices, and achieve the effects of saving space, low cost, and simplifying the structure

Active Publication Date: 2008-11-19
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This becomes a factor hindering the miniaturization of imaging devices

Method used

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  • Color electrophotographic image forming apparatus
  • Color electrophotographic image forming apparatus
  • Color electrophotographic image forming apparatus

Examples

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no. 1 example

[0035] The color electrophotographic image forming apparatus according to the first embodiment will be described below. In this example, a color laser beam printer having four developing devices is taken as an example of a color electrophotographic image forming apparatus. figure 1 It is a sectional view showing a color laser beam printer.

[0036] First, the image forming operation of the color laser beam printer will be described.

[0037] Such as figure 1 As shown, the image forming apparatus includes an electrophotographic photosensitive drum 2 . A charging roller 3 , an exposure unit 4 , four developing devices 18 a to 18 d , and a cleaning device 6 are provided around the photosensitive drum 2 . The charging roller 3 is charging means for uniformly charging the photosensitive drum 2 . The exposure unit 4 is an exposure device that irradiates the photosensitive drum 2 with a laser beam corresponding to image information. The charged photosensitive drum 2 is irradiate...

no. 2 example

[0083]Next, refer to Figure 7 and 8 Another embodiment of the drive transmission mechanism for rotating the rotating body 102 will be described.

[0084] Figure 7 is a front view showing the configuration of the drive transmission mechanism in which the developing roller 182 a is located at a developing position facing the photosensitive drum 2 . Figure 8 is from the right Figure 7 right side view of . Figure 7 Not indicated Figure 8 The main frame 171 shown in. in addition, Figure 8 Not indicated Figure 7 The transfer belt 7 and the transfer roller 81 are shown in .

[0085] In this embodiment, a cam 183 as a rotating member (guide) rotating together with the rotating body 102 is provided in each of the developing devices 18 a to 18 d supported by the rotating body 102 . Other configurations and operations are the same as the above embodiment.

[0086] Such as Figure 7 and 8 As shown, each of the developing devices 18a to 18d includes contact portions 183...

no. 3 example

[0090] Next, refer to Figure 9 and 10 Another embodiment of the drive transmission mechanism for rotating the rotating body 102 will be described in detail.

[0091] Figure 9 is a front view showing the configuration of the drive transmission mechanism in which the developing roller 182 a is located at a developing position facing the photosensitive drum 2 . Figure 10 is from the right Figure 9 right side view of . Figure 9 Not indicated Figure 10 The main frame 171 shown in. in addition, Figure 10 Not indicated Figure 9 The transfer belt 7 and the transfer roller 81 are shown in .

[0092] In this embodiment, the above-mentioned regulating member is integrally formed with the photosensitive drum 2 . That is, the support bar 2a for supporting the photosensitive drum 2 also serves as an adjustment member for adjusting the pivotal movement of the rotary body. In this embodiment, the support bar 2a has the function of the adjustment rotary member 105 in the abov...

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PUM

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Abstract

A color electrophotographic image forming apparatus which simplifies a configuration in which a rotary is rotated to change over respective developing devices to a development position to reduce the costs and save the space, and which simplifies the changeover operation to reduce an operating time. The image forming apparatus sequentially moves and changes over the respective developing devices supported by the rotary to the development position which faces a photosensitive drum by the rotation of the rotary. The rotary is rotated to move the developing devices. A cam is rotated integrally with the rotary, and thereby abutment portions of the cam are abutted against a regulating rotatable member so that the developing devices are spaced from a photosensitive drum. In a state in which the developing devices are abutted against the photosensitive drum, the cam is spaced from the regulating rotatable member by recesses of the cam.

Description

field of invention [0001] The present invention relates to a color electrophotographic image forming apparatus employing a rotary support (rotary body) that supports a plurality of developing devices and is rotatable. Background technique [0002] Hitherto, there is known a color electrophotographic image forming apparatus employing a rotary support (rotary body) that supports a plurality of developing devices and is rotatable. In this image forming apparatus, the rotary support rotates. Regarding the operation, a plurality of developing devices supported by the rotary support are sequentially moved to a developing position facing the photosensitive drum. In addition, the swivel support is provided to be pivotable relative to the device main body. With the above configuration, the developing device is brought into contact with or away from the photosensitive drum (see Japanese Patent Application Laid-Open No. 2005-148319). [0003] In more detail, the rotation support (ro...

Claims

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Application Information

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IPC IPC(8): G03G15/01G03G15/00F16H37/12
Inventor 青木大介宫部滋夫上野隆人
Owner CANON KK
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