Image forming apparatus
A device and image technology, applied in the direction of equipment for electrical recording technology using charge graphics, electrical recording technology using charge graphics, instruments, etc.
Inactive Publication Date: 2016-05-11
CANON KK
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Problems solved by technology
In addition, the photosensitive drum causing the drum memory needs to be replaced in some cases, so there is also a problem of running cost and downtime (period during which images cannot be output)
[0013] In the above, the case where the adjustment operation is the cleaning operation of the secondary transfer roller has been described as an example, however, in the case where a voltage having a polarity opposite to that of the charging polarity of the photosensitive drum is applied to the secondary transfer roller during non-image formation, Similar problems can arise in any operation
Method used
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Embodiment 1
[0031] 1. General configuration and operation of image forming apparatus
[0032] figure 1 is a schematic sectional view of the image forming apparatus 100 in the present embodiment according to the present invention.
[0033] The image forming apparatus 100 in this embodiment is a tandem type laser beam printer capable of outputting full-color images by using an electrophotographic type and an intermediate transfer type.
[0034] The image forming apparatus 100 includes first to fourth image forming sections (stations) Sa, Sb, Sc, and Sd for forming images of yellow (Y), magenta (M), cyan (C), and black (Bk), respectively. As a multiple image forming part. These image forming portions are arranged in a row at regular intervals. In this embodiment, the configuration and operation of the image forming portions Sa, Sb, Sc, and Sd are basically the same except that the colors of toners used are different from each other. Therefore, hereinafter, where no special distinction i...
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An image forming apparatus includes a photosensitive member, a charging member for electrically charging the photosensitive member to a first polarity, an intermediary transfer belt, a transfer member, a constant-voltage element, a voltage source, and a controller for executing an adjusting operation for applying at least a voltage of a second polarity, opposite to the first polarity from the voltage source to the transfer member during non-image formation in which both of primary transfer and secondary transfer are not effected. When the voltage of the second polarity is applied from the voltage source to the transfer member in the adjusting operation, the controller continuously applies the voltage for a time corresponding to a substantially integer multiple of a time required for one full turn of the photosensitive member.
Description
technical field [0001] The present invention relates to an image forming apparatus of electrophotographic type, such as a copier or a printer. Background technique [0002] As a conventional image forming apparatus of an electrophotographic type, there is an image forming apparatus of an intermediate transfer type in which a toner image formed on a photosensitive member is primarily transferred onto an intermediate transfer member and It is then secondarily transferred onto a transfer material such as paper. As an image forming apparatus of an intermediate transfer type, there is a type of image forming apparatus called a cascade type in which a plurality of image forming apparatuses for forming toner images of different colors are independently provided parts, and the toner images are sequentially primary-transferred from the respective image forming portions onto the intermediate transfer member and then secondary-transferred collectively from the intermediate transfer me...
Claims
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IPC IPC(8): G03G15/16
CPCG03G15/162G03G15/1645G03G15/1605G03G15/1675G03G2215/0132
Inventor 仲江川彻
Owner CANON KK