Abstract: An image forming apparatus includes: an image forming unit having an image supporting body and a developing unit; a transfer roller; a transfer belt having a conveying surface onto which a recording material is placed; a cleaning unit; a density detection unit detecting toner density on the conveying surface; a calibration processing unit that executes a calibration process; and a control unit that: in a state in which the calibration process has been executed, instructs the image forming unit to adjust the toner density of the toner image formed on the image supporting body based on the toner density detected by the density detection unit; and in a state in which the calibration process has not been executed, switches the cleaning unit to the cleaning state or maintains the cleaning unit in the non-cleaning state based on the toner density detected by the density detection unit.

Abstract: An image forming apparatus includes a chassis; an image carrier on whose surface a toner image is formed; a transfer roller configured to transfer the toner image formed on the image carrier onto to a recording medium and including a roller shaft and a transfer roller main body; a frame disposed inside the chassis; a transfer-roller supporting part configured to support the transfer roller and to move the transfer roller to a contact position and a spacing position; a terminal member configured to contact an end surface of the roller shaft and supply a voltage; and a terminal supporting member configured to rotatably support the terminal member with respect to the frame, wherein the terminal member rotates while following the movement of the transfer roller between the contact position and the spacing position, and wherein the terminal member maintains a contact state with the end surface of the roller shaft.

Abstract: An image forming apparatus includes: an image forming unit having an image supporting body and a developing unit; a transfer roller; a transfer belt having a conveying surface onto which a recording material is placed; a cleaning unit; a density detection unit detecting toner density on the conveying surface; a calibration processing unit that executes a calibration process; and a control unit that: in a state in which the calibration process has been executed, instructs the image forming unit to adjust the toner density of the toner image formed on the image supporting body based on the toner density detected by the density detection unit; and in a state in which the calibration process has not been executed, switches the cleaning unit to the cleaning state or maintains the cleaning unit in the non-cleaning state based on the toner density detected by the density detection unit.

Abstract: An image forming apparatus includes a chassis; an image carrier on whose surface a toner image is formed; a transfer roller configured to transfer the toner image formed on the image carrier onto to a recording medium and including a roller shaft and a transfer roller main body; a frame disposed inside the chassis; a transfer-roller supporting part configured to support the transfer roller and to move the transfer roller to a contact position and a spacing position; a terminal member configured to contact an end surface of the roller shaft and supply a voltage; and a terminal supporting member configured to rotatably support the terminal member with respect to the frame, wherein the terminal member rotates while following the movement of the transfer roller between the contact position and the spacing position, and wherein the terminal member maintains a contact state with the end surface of the roller shaft.

Abstract: An image forming apparatus is provided with a first and a second sheet feeding sections for accommodating sheets before printing in a stacked manner; a first sheet conveying section including first conveying members and adapted to convey a sheet received from the first sheet feeding section; a second sheet conveying section including second conveying members and adapted to convey a sheet received from the second sheet feeding section; a plurality of image forming units each including driven members and adapted to form toner images of different colors; a first driving source for driving the first conveying members; and a second driving source for driving the second conveying members. Some of the driven members are driven by the first driving source and others are driven by the second driving source.

Abstract: An image forming apparatus is provided with a first and a second sheet feeding sections for accommodating sheets before printing in a stacked manner; a first sheet conveying section including first conveying members and adapted to convey a sheet received from the first sheet feeding section; a second sheet conveying section including second conveying members and adapted to convey a sheet received from the second sheet feeding section; a plurality of image forming units each including driven members and adapted to form toner images of different colors; a first driving source for driving the first conveying members; and a second driving source for driving the second conveying members. Some of the driven members are driven by the first driving source and others are driven by the second driving source.