Abstract: An image forming apparatus includes an image bearing member, a rotatable endless intermediary transfer belt, an inner roller, an outer roller, a power source, a detecting portion, and a controller. On the basis of a result of detection by the detecting portion when a voltage is applied to the inner roller so as to form a chart on a recording material of a predetermined kind in an operation in an adjusting mode, the controller determines whether a transfer voltage when a toner image is transferred onto the recording material of the predetermined kind is subjected to constant-voltage control so that the voltage applied to the inner roller by the power source becomes a target value or is subjected to constant-current control so that a current supplied to the inner roller becomes a target value.

Abstract: The control unit executes a mode of detecting the image density of the toner image for control. The control unit sets the target toner density so that the target toner density becomes smaller than before execution of the mode and also set the target transfer current so that the target transfer current becomes smaller, in a case where the image density detected in the mode is higher by a predetermined threshold or more than a reference density.

Abstract: In an image forming apparatus, a cleaning blade, disposed on a downstream side of a transfer roller in a rotation direction of an image carrier, removes toner remaining on the image carrier after transfer of a toner image to an intermediate transfer member. After completion of an image forming operation, a controller causes the transfer roller to separate from the intermediate transfer member, cause the developing device to form on the image carrier a toner band to be supplied to the cleaning blade, and cause rotation of the image carrier to stop such that at least a part of the toner band formed on the image carrier stops within a section from a first position facing the transfer roller to a second position facing the cleaning blade in the rotation direction.

Abstract: In an image forming apparatus, a cleaning blade, disposed on a downstream side of a transfer roller in a rotation direction of an image carrier, removes toner remaining on the image carrier after transfer of a toner image to an intermediate transfer member. After completion of an image forming operation, a controller causes the transfer roller to separate from the intermediate transfer member, cause the developing device to form on the image carrier a toner band to be supplied to the cleaning blade, and cause rotation of the image carrier to stop such that at least a part of the toner band formed on the image carrier stops within a section from a first position facing the transfer roller to a second position facing the cleaning blade in the rotation direction.

Abstract: (Object) An object is to suppress the peeling and lamination misalignment of ceramic green sheets without deteriorating the sheet strength. (Solution) A ceramic green sheet lamination aid comprising a compound represented by formula (1). Z—[O-(AO)n-H]x??(1) (Z represents a residual group of a compound having a number of carbons group of 1 to 22 and having hydroxyl groups of 1 to 6 in which all of said hydroxyl groups are removed; x represents a number of 1 to 6; AO represents an oxyalkylene group having a number of carbons of 2 to 4; n represents a number of 5 to 500; x×n is in a range of 5 to 500; and a weight ratio of oxyethylene group EO contained in the oxyalkylene group AO having the number of carbons of 2 to 4 is 0 to 80 weight %.

Abstract: The control unit executes a mode of detecting the image density of the toner image for control. The control unit sets the target toner density so that the target toner density becomes smaller than before execution of the mode and also set the target transfer current so that the target transfer current becomes smaller, in a case where the image density detected in the mode is higher by a predetermined threshold or more than a reference density.

Abstract: An image forming apparatus includes a photosensitive member, a rotatable intermediate transfer belt configured to come into contact with a photosensitive member at a first contact portion on an outer peripheral surface thereof, and, a transfer member configured to come into contact with an inner peripheral surface of the intermediate transfer belt at a second contact portion. The transfer member is disposed such that an upstream end of the second contact portion is positioned downstream of a downstream end of the first contact portion in the rotation direction of the intermediate transfer belt. In a case where a surface resistivity measured on the outer peripheral surface of the intermediate transfer belt is G and a surface resistivity measured on the inner peripheral surface of the intermediate transfer belt is N, 0.75?N/G?1.2 is satisfied.

Abstract: An image forming apparatus includes an image bearing member, a transfer roller, an electric energy supply member, a voltage source, a detector, and a controller for adjusting a transfer voltage. A circumferential length 2K of the transfer roller and a distance k measured along an outer periphery of the transfer roller from the electric energy supplying member to the transfer roller satisfy 0.8K?k?1.2K. The controller controls the voltage source so as to satisfy 0.7T?t?1.3T, where 2T is time required for one full rotation of the transfer roller, and t is time during which the voltage source supplies the test current or the test voltage per one level in the operation of a setting mode.

Abstract: An image forming apparatus includes an image bearing member 7, a transfer roller 8, an electric energy supply member 9, a voltage source E2, a detecting means 32 a controlling means 50 for adjusting a transfer voltage. A circumferential length 2K of the transfer roller, and a distance k measured along an outer periphery of the transfer roller from the electric energy supplying portion to the transfer portion satisfy 0.8K?k?1.2K. The controller controls the voltage source so as to satisfy 0.7T?t?1.3T, where 2T is time required for one full rotation of the transfer roller, and t is time during which the voltage source supplies in the test current or the test voltage per one level in the operation of the setting mode.

Abstract: An idler roller as at least one of a plurality of support rollers for stretching an intermediate transfer belt is a metal roller having a groove formed on a metal surface. A primary transfer roller is a metal roller having a metal surface with a smaller maximum surface height than the idler roller.

Abstract: An image forming apparatus includes a photosensitive member, a rotatable intermediate transfer belt configured to come into contact with a photosensitive member at a first contact portion on an outer peripheral surface thereof, and, a transfer member configured to come into contact with an inner peripheral surface of the intermediate transfer belt at a second contact portion. The transfer member is disposed such that an upstream end of the second contact portion is positioned downstream of a downstream end of the first contact portion in the rotation direction of the intermediate transfer belt. In a case where a surface resistivity measured on the outer peripheral surface of the intermediate transfer belt is G and a surface resistivity measured on the inner peripheral surface of the intermediate transfer belt is N, 0.75?N/G?1.2 is satisfied.

Abstract: An idler roller as at least one of a plurality of support rollers for stretching an intermediate transfer belt is a metal roller having a groove formed on a metal surface. A primary transfer roller is a metal roller having a metal surface with a smaller maximum surface height than the idler roller.

Abstract: A power supply is configured to apply voltage to a power feed roller. An elastic blade of a roller cleaning unit clean a surface of the power feed roller at a position different from an abutting position of the power feed roller and a secondary transfer outer roller. A control unit is configured to execute a secondary transfer cleaning mode at a timing when a transfer of a toner image in a secondary transfer portion is not performed. In the secondary transfer cleaning mode, a voltage of only one of the positive and negative polarities is applied to the power feed roller while the secondary transfer outer roller and the power feed roller are rotated.

Abstract: An image forming apparatus, which is capable of suitably preventing a separating discharge phenomenon from occurring at a fixing entrance guide for guiding a recording material to a fixing device, includes a control portion for controlling a transfer bias voltage and a separation bias voltage. A transfer roller transfers a toner image from a surface of a photosensitive drum onto a sheet at a transfer nip portion, and the control portion changes the transfer bias voltage applied to the transfer roller and the separation bias voltage applied to a charge eliminating needle to have larger voltage values before a trailing edge of the sheet, which is conveyed to the transfer nip portion and is subjected to transfer, passes through the transfer nip portion.

Abstract: An image forming apparatus, which is capable of suitably preventing a separating discharge phenomenon from occurring at a fixing entrance guide for guiding a recording material to a fixing device, includes a control portion for controlling a transfer bias voltage and a separation bias voltage. A transfer roller transfers a toner image from a surface of a photosensitive drum onto a sheet at a transfer nip portion, and the control portion changes the transfer bias voltage applied to the transfer roller and the separation bias voltage applied to a charge eliminating needle to have larger voltage values before a trailing edge of the sheet, which is conveyed to the transfer nip portion and being subjected to transfer, passes through the transfer nip portion.