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Image forming device

An image and image information technology, which is applied in the field of image forming devices for charged components of the developer, can solve problems such as incapability of charging and inability to obtain charged potential

Inactive Publication Date: 2005-04-06
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, by the second developer charging member, the excessive negative charge is imparted on the contrary, so that when the downstream of the developer charging member is charged by the contact charging member, uniform charging cannot be performed, and the desired result cannot be obtained. charged potential of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0042] Next, the image forming apparatus (image recording apparatus) of the embodiment will be described.

[0043] figure 1 is a schematic configuration diagram of an example of an image forming apparatus according to the present invention. The image forming apparatus of this example is a cleaner-less electrophotographic laser beam printer of a contact charging type and an inversion developing method. The maximum paper format of the transfer material is A3 format.

[0044] (1) Overall configuration of the printer

[0045] (a) image carrier

[0046] 1 is a rotating drum type electrophotographic photoreceptor (hereinafter referred to as a photoreceptor drum) as an image carrier. This photosensitive drum 1 is a negatively charged organic photoconductor (OPC) with an outer diameter of 60 mm, and is driven to rotate counterclockwise from the arrow at a processing speed (peripheral speed) of 100 mm / sec around a central axis.

[0047] This photosensitive drum 1 image figure 2...

no. 2 Embodiment

[0119] The basic configuration of the image forming apparatus (printer) of this embodiment is the same as that of the first embodiment.

[0120] As described in the first embodiment, an appropriate DC voltage is applied to the toner charge control mechanism 7 and the transfer residue toner equalization mechanism 8 to control the transfer residue on the photosensitive drum 1 passing through the transfer portion d. The amount of electric charge of the toner, whereby it is possible to develop an image by the developing device 4 while cleaning (recovering) the transfer residual toner.

[0121] However, since the charge amount of the transfer residual toner on the photosensitive drum 1 passing through the transfer portion d varies depending on the amount of image printing, in order to perform image development and cleaning at the same time by the developing device 4, the toner charge amount control mechanism 7 The amount of charge imparted to the transfer residual toner by the tran...

no. 3 Embodiment

[0131] The basic configuration of the image forming apparatus (printer) of this embodiment is the same as that of the first and second embodiments.

[0132] In this embodiment, it is a combination of the first embodiment and the second embodiment, such as Figure 9 As shown in , it is detected by the absolute moisture content in the use environment calculated from the temperature and humidity detected by the temperature and humidity sensor 9 installed in the image forming device, and by the exposure amount of the exposure mechanism 3 as an information writing mechanism. Image printing information (image printing ratio information), variably control the direct current applied to the toner charge amount control mechanism 7 and the transfer residual toner uniformization mechanism 8 (mainly the transfer residual toner uniformization mechanism 8) Voltage. Thereby, it is possible to provide a stable image forming apparatus using a cleanerless system free from charging failure or de...

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PUM

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Abstract

An image forming apparatus includes an image bearing member; charging means for electrically charging the image bearing member; developing means for developing an electrostatic latent image formed on the image bearing member with a developer into a developed image; transferring means for transferring the developed image from the image bearing member onto an image receiving member; a first developer charging member for electrically charging a residual developer on the image bearing member, the first developer charging member being disposed downstream of the transferring means and upstream of the charging means, with respect to a movement direction of the image bearing member, and the first developer charging member being supplied with a voltage of a polarity opposite a regular polarity of the developer; a second developer charging for electrically charging the residual developer on the image bearing member to the regular polarity of the developer, the second developer charging member being disposed downstream of the first developer charging means and upstream of the charging means, with respect to the movement direction of the image bearing member.

Description

technical field [0001] The present invention relates to an image forming apparatus equipped with a developer charging member for charging residual developer on an image carrier, and is suitable for a cleanerless image forming apparatus without a dedicated cleaner. More preferably, it relates to a cleanerless image forming apparatus in which developer (toner) remaining on the image carrier after the transfer process is removed and recovered from the image carrier for reuse in the developing device. Background technique [0002] In the prior art, transfer type image forming devices such as electrophotographic copiers, printers, and facsimile machines are generally taken as a rotating drum-type photoreceptor as an image carrier, and the photoreceptor is uniformly polarized at a predetermined polarity and potential. The charging device (charging process) for charging treatment, the exposure mechanism (exposure process) of the information writing mechanism that forms an electrost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/00G03G15/08G03G21/00
CPCG03G21/0064G03G2221/0005G03G2215/021
Inventor 吉川忠伸渡边泰成足立元纪
Owner CANON KK