Patent ID: 9020372
Filing Date: 2015-04-28
Classification: G03G

Abstract:
1. An image forming apparatus that performs a sequence of image formation processing operations according to a print job, for forming a toner image on at least one of a plurality of image bearing members, transferring the toner image formed on at least one of the plurality of image bearing members onto a belt member, and further transferring the toner image, which has been transferred onto the belt member, onto a recording sheet, comprising: a shift unit configured to shift the belt member to thereby switch a position of the belt member relative to the plurality of image bearing members to an all-contact position in which the belt member is in contact with all of the plurality of image bearing members or a partial-contact position in which the belt member is in contact with only part of the plurality of image bearing members; a first obtaining unit configured to obtain color information indicative of whether an image to be formed is a color image or a monochrome image, concerning each page on which image formation is to be performed according to the print job; a recovery unit configured to perform recovery printing in a case where the print job is interrupted due to a cause of interruption; a determination unit configured to determine, based on the color information obtained by said first obtaining unit, whether or not a color image is included in respective images for pages on which image formation is to be performed in recovery printing; and a selection unit configured to select, as a method of determining in which of the all-contact position and the partial-contact position, said shift unit is to position the belt member, a first determination method before a print job is interrupted, and select, based on a result of determination performed by said determination unit, one of the first determination method and a second determination method, for recovery printing after interruption of the print job, wherein the first determination method is a method of positioning the belt member in the all-contact position when an image of a page on which image formation is to be performed is a color image, and positioning the belt member in the partial-contact position when an image of a page on which image formation is to be performed is a monochrome image, and wherein the second determination method is a method of positioning the belt member in the all-contact position for all pages on which image formation is to be performed.