Abstract: An on-line gloss/density meter for an electrostatographic reproduction apparatus in which pigmented marking particle images are fixed to receiver members respectively by application of heat and/or pressure as such receiver members travel along a transport path through a fuser assembly. The on-line gloss/density meter includes at least one light emitter and at least one light collector, respectively mounted in operative association with the transport path so that light from the emitter, reflected from a receiver member, and is detected and a signal corresponding to such reflected light is produced. A guide element is associated with the transport path and directs a receiver member into a predetermined specified location relative to the beam of light. A logic and control unit, responsive to signals from the light collector, precisely controls operating parameters for the electrostatographic reproduction apparatus.

Abstract: An image forming apparatus has a developing device for developing an electrostatic image formed on an image bearing member by a developer. A developer supplying unit is detachably attachable to a main body of the image forming apparatus and supplies the developer to the developing device. A density detecting device detects a density of the developer in the developing device. A developer remaining amount detecting device detects information regarding an amount of the developer in the developing supplying unit. A state of the developer supplying unit is judged on the basis of a result of the detection by the density detecting device and a result of the detection by the second detecting device.

Abstract: A print medium is fed through a printer along a print path that can include one or more devices and a print engine. A plurality of path identifiers are used to identify the different print paths through the printer. According to one embodiment of the invention, a path identifier defines a print path from an input device through the print engine and possibly through an output device. According to another embodiment of the invention, path identifiers are separated into input paths and output paths. An input path identifier defines a print path from an input device to the print engine, while an output path identifier defines a print path from the print engine to an output device.