01-08-2019 дата публикации
Номер: US20190235419A1
Принадлежит:
In a case where a controller executes formation of a first image which is a monochrome image, a second image which is a monochrome image, a third image which is a color image, and a fourth image which is a color image in order, the controller forms the first image by a fourth image formation unit in a separated state, controls a mechanism to switch to a contact state after the formation of the first image completes and transfer to a sheet by an intermediate transfer member completes, and prior to starting formation of the second image. The controller forms the second image by the fourth image formation unit and forms the third image by the first image formation unit. 1. An image forming apparatus operable to form an image on a sheet , the apparatus comprising:a first image formation unit that forms a toner image by toner of a first color;a second image formation unit that forms a toner image by toner of a second color;a third image formation unit that forms a toner image by toner of a third color;a fourth image formation unit that forms a toner image by toner of a fourth color;an intermediate transfer member onto which toner images formed by each of the first image formation unit, the second image formation unit, the third image formation unit, and the fourth image formation unit are transferred, and that conveys the toner images to a transfer position at which to transfer the toner images to a sheet;a contact and separation mechanism that switches a contact state in which the intermediate transfer member are in contact with the first image formation unit, the second image formation unit, and the third image formation unit and a separated state in which the intermediate transfer member are separated from the first image formation unit, the second image formation unit, and the third image formation unit; anda controller that controls the first image formation unit, the second image formation unit, the third image formation unit, the fourth image formation unit, and ...
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