Abstract: A waste toner collector of the present invention includes: a container main body configured to collect and store waste toner; and a conveyance member configured to convey the waste toner in the container main body. The container main body is provided with, on one side wall, a plurality of protruding containing portions that protrude outward from the container main body and are disposed along a longitudinal direction of the container main body, and a plurality of recesses each positioned between adjacent ones of the protruding containing portions. The conveyance member extends along the longitudinal direction of the container main body and is rotatably disposed in the container main body. Waste toner conveyance force of the conveyance member in a rotary shaft direction varies in such a manner that, at border portions between the protruding containing portions and the recesses, the waste toner is pushed toward the protruding containing portions.

Abstract: A waste toner collector of the present invention includes: a container main body configured to collect and store waste toner; and a conveyance member configured to convey the waste toner in the container main body. The container main body is provided with, on one side wall, a plurality of protruding containing portions that protrude outward from the container main body and are disposed along a longitudinal direction of the container main body, and a plurality of recesses each positioned between adjacent ones of the protruding containing portions. The conveyance member extends along the longitudinal direction of the container main body and is rotatably disposed in the container main body. Waste toner conveyance force of the conveyance member in a rotary shaft direction varies in such a manner that, at border portions between the protruding containing portions and the recesses, the waste toner is pushed toward the protruding containing portions.

Abstract: An image forming apparatus of the present invention includes a first identification section for identifying whether a print target page in a print target document is color or monochrome and its page attribute, a second identification section for identifying a system speed during printing of an immediately preceding page of the print target page, a third identification section for identifying a presence of a subsequent page of the print target page and its page attribute, and a system speed determination section for selecting a print mode in conformity to a monochrome/color discrimination result based on an identification result in the first identification section and determining a system speed of the print target page based on the page attribute identified by the first identification section and identification results in the second and third identification sections.

Abstract: An image forming apparatus of the present invention includes a first identification section for identifying whether a print target page in a print target document is color or monochrome and its page attribute, a second identification section for identifying a system speed during printing of an immediately preceding page of the print target page, a third identification section for identifying a presence of a subsequent page of the print target page and its page attribute, and a system speed determination section for selecting a print mode in conformity to a monochrome/color discrimination result based on an identification result in the first identification section and determining a system speed of the print target page based on the page attribute identified by the first identification section and identification results in the second and third identification sections.