Abstract: An image forming apparatus includes an image bearing member; toner image forming means for forming a toner image on the image bearing member; a transfer member for transferring the toner image from the image bearing member onto a recording material; an executing portion for executing a first cleaning mode in which the transfer member is cleaned by being supplied with a voltage of an identical polarity to a normal charge polarity of toner during non-image formation and executing a second cleaning mode in which the transfer member is cleaned by being supplied with a voltage of an opposite polarity to the normal charge polarity of the toner during the non-image formation; and a control portion for changing a ratio between a first cleaning mode execution period and a second cleaning mode execution period depending on an operation environment of the image forming apparatus.

Abstract: An image forming apparatus includes an image carrier configured to carry a toner image, a movable belt member configured to convey a recording material, a transfer member configured to electrostatically transfer the toner image formed on the image carrier to the recording material conveyed by the belt material, and a plurality of auxiliary separation members configured to separate the recording material from the belt member such that the belt member positioned more downstream than the transfer member in the direction in which the recording material is conveyed is boosted from the inside of the belt member to locally protrude the belt surface of the belt member in the width direction, wherein the auxiliary separation members can move correspondingly to the size of the conveyed recording material in the width direction to the position where the ends of the recording material pass in the width direction.

Abstract: An image forming apparatus includes an image bearing member for bearing a toner image; a toner image forming portion for forming a toner image on the image bearing member; a rotatable belt member, stretched by a plurality of stretching members, for carrying and conveying a recording material; a transfer member for transferring the toner image from the image bearing member onto the recording material carried on the belt member by pressing the belt member against the image bearing member; a bias applying portion for applying to the transfer member a transfer bias for transferring the toner image from the image bearing member onto the recording material; a push-up member for locally pushing up the belt member from an inner surface side of the belt member, in a direction perpendicular to a recording material conveyance direction, at a downstream-side position of the transfer member with respect to the recording material conveyance direction; and an execution portion for executing an operation in a mode in which t

Abstract: In an image forming apparatus, temporary constant voltages are corrected by using three voltage-current data obtained by applying voltages at three levels to a primary transfer roller to detect currents corresponding to the voltages, respectively. A surface potential of a photosensitive drum is detected by a potential sensor by changing an exposure intensity of an exposure device at three levels in a state in which the temporary constant voltage is applied to the primary transfer roller. A constant voltage during image formation is determined by correcting the temporary constant voltage by using three voltage-current data obtained by detecting currents when surfaces different in potential by light exposure pass through a primary transfer portion.

Abstract: An image forming apparatus includes an image bearing member; a transfer member for transferring a toner image from the image bearing member onto a transfer material at a transfer portion; a control portion for controlling a voltage to be applied to the transfer member; a current detecting portion for detecting a value of a current passing through the transfer portion: a calculating portion for calculating a relationship between values of the voltage and the current which are obtained by applying voltages of different values at different intervals between adjacent images during execution of a continuous image forming mode in which the images are continuously formed on recording materials; a determining portion for determining the voltage value for a target current from the relationship calculated by the calculating portion; and a switching portion for switching the voltage value to the voltage value determined by the determining portion during the execution of the continuous image forming mode.

Abstract: Provided is an image forming apparatus, including: a first image bearing member; a first transfer member that comes into contact with the intermediate transfer member; a colored toner image forming portion; a second image bearing member; a second transfer member; and a transparent toner image forming portion for forming the transparent toner image wherein the transparent toner image forming portion is provided on an upstream side with respect to the colored toner image forming portion in a movement direction of the intermediate transfer member, and a distance between a most upstream end of the second contact area and the second transfer member in a rotation direction is larger than a distance between a most upstream end of the first contact area and the first transfer member in a rotation direction.

Abstract: An image forming apparatus for reducing time required for adjusting the image forming conditions and transport conditions and minimizing the number of recording material used for the adjustment. Image forming conditions and transport conditions for the recording material are adjusted according to the characteristic properties of the recording material. Associated data including an adjustment value obtained from the adjustment of the image forming conditions and transport conditions made by the adjustment unit and the characteristic properties of the recording material associated with the adjustment value is generated. The associated data stored in the storage unit is transmitted to the data collection/delivery apparatus. Delivery data regarding the adjustment of the image forming conditions and transport conditions is received from the data collection/delivery apparatus.

Abstract: Provided is an image forming apparatus, including: a first image bearing member; a first transfer member that comes into contact with the intermediate transfer member; a colored toner image forming portion; a second image bearing member; a second transfer member; and a transparent toner image forming portion for forming the transparent toner image wherein the transparent toner image forming portion is provided on an upstream side with respect to the colored toner image forming portion in a movement direction of the intermediate transfer member, and a distance between a most upstream end of the second contact area and the second transfer member in a rotation direction is larger than a distance between a most upstream end of the first contact area and the first transfer member in a rotation direction.

Abstract: An image forming apparatus includes an image bearing member; toner image forming means for forming a toner image on the image bearing member; a transfer member for transferring the toner image from the image bearing member onto a recording material; an executing portion for executing a first cleaning mode in which the transfer member is cleaned by being supplied with a voltage of an identical polarity to a normal charge polarity of toner during non-image formation and executing a second cleaning mode in which the transfer member is cleaned by being supplied with a voltage of an opposite polarity to the normal charge polarity of the toner during the non-image formation; and a control portion for changing a ratio between a first cleaning mode execution period and a second cleaning mode execution period depending on an operation environment of the image forming apparatus.

Abstract: An image forming apparatus, includes a first image bearing member; a first transfer member that comes into contact with either an intermediate transfer member or a recording material bearing member; a colored toner image forming portion; a second image bearing member; a second transfer member; and a transparent toner image forming toner. The transparent toner image forming portion is positioned on an upstream side with respect to the colored toner image forming portion in a movement direction of the intermediate transfer member or the recording material bearing member. As a result, a distance between a most upstream end of an area of contact between the intermediate transfer member or the recording material bearing member and the second transfer member in a rotation direction is larger than a distance between a most upstream end of an area of contact between the intermediate transfer member or the recording material bearing member and the first transfer member in a rotation direction.

Abstract: In an image forming apparatus, temporary constant voltages are not by using three voltage-current data obtained by applying voltages at three levels to a primary transfer roller to detect currents corresponding to the voltages, respectively. A surface potential of a photosensitive drum is detected by a potential sensor by changing an exposure intensity of an exposure device at three levels in a state in which the temporary constant voltage is applied to the primary transfer roller. A constant voltage during image formation is determined by correcting the temporary constant voltage by using three voltage-current data obtained by detecting currents when surfaces different in potential by light exposure pass through a primary transfer portion.

Abstract: An image forming apparatus having an image bearing member rotatable and bearing a toner image thereon, a transferring apparatus for electrostatically transferring the toner image born on the image bearing member to a recording material, a cleaning apparatus for electrostatically removing any toner not transferred to the recording material by the transferring apparatus but residual on the image bearing member from the image bearing member, a bias applying apparatus for applying a bias to the cleaning apparatus, and a controlling apparatus for variably controlling the bias condition of the bias applied to the cleaning apparatus by the bias applying apparatus, in accordance with the type of the recording material.

Abstract: An image forming apparatus for reducing time required for adjusting the image forming conditions and transport conditions and minimizing the number of recording material used for the adjustment. Image forming conditions and transport conditions for the recording material are adjusted according to the characteristic properties of the recording material. Associated data including an adjustment value obtained from the adjustment of the image forming conditions and transport conditions made by the adjustment unit and the characteristic properties of the recording material associated with the adjustment value is generated. The associated data stored in the storage unit is transmitted to the data collection/delivery apparatus. Delivery data regarding the adjustment of the image forming conditions and transport conditions is received from the data collection/delivery apparatus.

Abstract: An image forming apparatus including an image bearing member bearing thereon a toner image charged to a predetermined polarity, a transferring device for electrostatically transferring the toner image borne on the image bearing member to a recording material, first and second cleaning members for electrostatically removing from the image bearing member any toner residual on the image bearing member when the toner image is transferred to the recording material, a first power supply for applying a bias of the same polarity as the predetermined polarity to the first cleaning member, a second power supply for applying a bias of a polarity opposite to the predetermined polarity to the second cleaning member, and a controller for variably controlling the condition of the bias applied to the first cleaning member and the condition of the bias applied to the second cleaning member independently of each other.

Abstract: An image forming apparatus having an image bearing member rotatable and bearing a toner image thereon, a transferring apparatus for electrostatically transferring the toner image borne on the image bearing member to a recording material, a cleaning apparatus for electrostatically removing any toner not transferred to the recording material by the transferring apparatus but residual on the image bearing member from the image bearing member, a bias applying apparatus for applying a bias to the cleaning apparatus, and a controlling apparatus for variably controlling the bias condition of the bias applied to the cleaning apparatus by the bias applying apparatus, in accordance with the type of the recording material.

Abstract: An image forming apparatus having an image bearing member rotatable and bearing a toner image thereon, a transferring apparatus for electrostatically transferring the toner image borne on the image bearing member to a recording material, a cleaning apparatus for electrostatically removing any toner not transferred to the recording material by the transferring apparatus but residual on the image bearing member from the image bearing member, a bias applying apparatus for applying a bias to the cleaning apparatus, and a controlling apparatus for variably controlling the bias condition of the bias applied to the cleaning apparatus by the bias applying apparatus, in accordance with the type of the recording material.

Abstract: An image forming apparatus which can quickly remove remaining toner even after it has been emergently stopped when it forms an image by the use of an intermediate transfer member. An image forming apparatus for primary-transferring a toner image formed on a photosensitive drum to an intermediate transfer belt by a primary transfer roller, and secondary-transferring the primary-transferred image to a recording material to thereby form an image has a secondary cleaning portion for applying a bias to a plurality of fur brushes, wherein during ordinary image forming, biases of different polarities are applied to the plurality of fur brushes to thereby effect cleaning, and during a returning operation after emergent stoppage, biases of the same polarity are applied to the plurality of fur brushes to thereby effect cleaning.

Abstract: Provided is an image forming apparatus, including: a first image bearing member; a first transfer member that comes into contact with the intermediate transfer member; a colored toner image forming portion; a second image bearing member; a second transfer member; and a transparent toner image forming portion for forming the transparent toner image wherein the transparent toner image forming portion is provided on an upstream side with respect to the colored toner image forming portion in a movement direction of the intermediate transfer member, and a distance between a most upstream end of the second contact area and the second transfer member in a rotation direction is larger than a distance between a most upstream end of the first contact area and the first transfer member in a rotation direction.

Abstract: An image forming apparatus having an image bearing member rotatable and bearing a toner image thereon, a transferring apparatus for electrostatically transferring the toner image borne on the image bearing member to a recording material, a cleaning apparatus for electrostatically removing any toner not transferred to the recording material by the transferring apparatus but residual on the image bearing member from the image bearing member, a bias applying apparatus for applying a bias to the cleaning apparatus, and a controlling apparatus for variably controlling the bias condition of the bias applied to the cleaning apparatus by the bias applying apparatus, in accordance with the type of the recording material.

Abstract: An image forming apparatus including an image bearing member bearing thereon a toner image charged to a predetermined polarity, a transferring device for electrostatically transferring the toner image borne on the image bearing member to a recording material, first and second cleaning members for electrostatically removing from the image bearing member any toner residual on the image bearing member when the toner image is transferred to the recording material, a first power supply for applying a bias of the same polarity as the predetermined polarity to the first cleaning member, a second power supply for applying a bias of a polarity opposite to the predetermined polarity to the second cleaning member, and a controller for variably controlling the condition of the bias applied to the first cleaning member and the condition of the bias applied to the second cleaning member independently of each other.