| 摘要 |
An image forming apparatus includes a belt, a plurality of image forming devices including a photosensitive member, a developing device, a transfer device and a blade, and a control device configured to form a pattern image on a first photosensitive member, when an image to be printed on a sheet is not formed, by applying a developing voltage to a first developing device, an absolute value thereof is greater than that when an image to be printed on a sheet is formed, transfer the pattern image onto the belt and apply a transfer voltage or transfer current having the same polarity as that applied to a second transfer device when an image to be printed on a sheet is formed to the second transfer device when the pattern image to be conveyed by the belt passes the second transfer device. |
| 主权项 |
1. An image forming apparatus comprising:
a belt; a plurality of image forming devices each comprising:
a photosensitive member;a developing device configured to supply toner to the photosensitive member;a transfer device configured to transfer the toner supplied onto the photosensitive member to the belt; anda blade configured to contact a surface of the photosensitive member,wherein the plurality of image forming devices is arranged in a conveying direction of the toner on the belt; and a control device configured to:
form a pattern image on a first photosensitive member, when an image to be printed on a sheet is not formed, by applying a developing voltage to a first developing device, wherein an absolute value of the developing voltage applied to the first developing device when the pattern image is formed on the first photosensitive member is greater than an absolute value of the developing voltage applied to the first developing device when an image to be printed on a sheet is formed, the first photosensitive member being the photosensitive member of a first image forming device of the plurality of image forming devices, the first developing device being the developing device of the first image forming device;transfer the pattern image formed on the first photosensitive member onto the belt by using a first transfer device, the first transfer device being the transfer device of the first image forming device; andapply a transfer voltage or transfer current, which has the same polarity as that applied to a second transfer device when an image to be printed on a sheet is formed, to the second transfer device when the pattern image to be conveyed by the belt passes the second transfer device, the second transfer device being the transfer device of a second image forming device of the plurality of image forming devices, the second image forming device being different from the first image forming device. |
