Abstract: In a cross section perpendicular to a rotational axis of a first image bearing member, when a common tangential line between the first image bearing member and a second image bearing member on an intermediary transfer belt side is a rectilinear line L, a rectilinear line passing through a rotation center of the first image bearing member and a rotation center of a first transfer member is a rectilinear line P, and a rectilinear line passing through an intersection point between the rectilinear line P and the first image bearing member and perpendicular to the rectilinear line P is a rectilinear line Q, an electrode member is constituted so that the contact portion contacting an inner surface of the belt is positioned on a first image bearing member side than the rectilinear line L is and on a first transfer member side than the rectilinear line Q is.

Abstract: A charge eliminating apparatus configured to remove charges from a sheet on which an image is formed by a printing apparatus, includes a charge eliminating roller pair including a first charge eliminating roller and a second charge eliminating roller configured to form a nip portion together with the first charge eliminating roller, the charge eliminating roller pair being configured to remove the charges from the sheet in a state of contacting the sheet at the nip portion, a first setting unit configured to set a value of a voltage applied to the charge eliminating roller pair, and a second setting unit configured to set whether to apply the voltage to the charge eliminating roller pair, wherein the second setting unit is configured to set whether to apply the voltage to the charge eliminating roller pair without changing the value of the voltage set by the first setting unit.

Abstract: A charge-eliminating apparatus includes a charge-eliminating member, a voltage applying unit, a setting unit for setting a value of a voltage applied to the charge-eliminating member by the voltage applying unit. A controller executes a changing process in which the value of a voltage to be output by the voltage applying unit is changed from the value of the voltage set by the setting unit during execution of a charge-eliminating operation in which the charge of a plurality of sheets is continuously eliminated by the charge-eliminating member. A selecting unit selects a first mode in which the changing process is performed during the execution of the charge-eliminating operation or a second mode in which the changing process is not performed during the execution of the charge-eliminating operation and the voltage is output by the voltage applying unit based on the value set by the setting unit.

Abstract: In a cross-section perpendicular to a rotational axis of a first image bearing member, when a common tangential line between the first image bearing member and a second image bearing member on an intermediary transfer belt side is a rectilinear line L, a rectilinear line passing through a rotation center of the first image bearing member and a rotation center of a first transfer member is a rectilinear line P, and a rectilinear line passing through an intersection point between the rectilinear line P and the first image bearing member and perpendicular to the rectilinear line P is a rectilinear line Q, an electrode member is constituted so that the contact portion contacting an inner surface of the belt is positioned further on a first image bearing member side than the rectilinear line L is and further on a first transfer member side than the rectilinear line Q is.

Abstract: A charge-eliminating apparatus includes a charge-eliminating member for eliminating charge of a sheet while nipping and conveying the sheet, a voltage applying unit for applying a voltage to the charge-eliminating member, and a detecting unit for detecting a voltage applied to the charge-eliminating member or a current flowing through the charge-eliminating member. A controller measures an electrification charge amount of the sheet based on a detecting result of the detecting unit while the sheet passes through the charge-eliminating member.

Abstract: A charge-eliminating apparatus configured to perform charge elimination on a sheet includes a charge-eliminating member configured to perform charge elimination on the sheet, a power source configured to apply a voltage to the charge-eliminating member, a contacting member configured to be brought into contact with the sheet, a detection circuit configured to detect a voltage applied to the contacting member or a current flowing in the contacting member, and a controlling unit configured to control the power source, wherein the controlling unit determines a value of the voltage applied from the power source to the charge-eliminating member during charge elimination by the charge-eliminating member based on a detection result from the detection circuit during passage of the sheet along the contacting member, and wherein the voltage applied to the contacting member undergoes constant current control, and the voltage applied to the charge-eliminating member undergoes constant voltage control.

Abstract: A charge-eliminating apparatus includes a charge-eliminating member configured to come into contact with a sheet and eliminate static charges from the sheet, a power supply configured to apply a voltage to the charge-eliminating member, a current detection circuit configured to detect a current flowing through the charge-eliminating member, and a control unit configured to control a value of the voltage by the power supply, based on a detection result obtained by the current detection circuit when the sheet passes over the charge-eliminating member, such that the current falls within a predetermined range with respect to a target value, wherein the control unit acquires a detection result of an environment detection sensor that detects an environmental condition, and wherein the control unit changes the target value based on the detection result of the environment detection sensor during execution of a job that eliminates static charges.

Abstract: A charge eliminating apparatus configured to remove charges from a sheet on which an image is formed by a printing apparatus, includes a charge eliminating roller pair including a first charge eliminating roller and a second charge eliminating roller configured to form a nip portion together with the first charge eliminating roller, the charge eliminating roller pair being configured to remove the charges from the sheet in a state of contacting the sheet at the nip portion, a first setting unit configured to set a value of a voltage applied to the charge eliminating roller pair, and a second setting unit configured to set whether to apply the voltage to the charge eliminating roller pair, wherein the second setting unit is configured to set whether to apply the voltage to the charge eliminating roller pair without changing the value of the voltage set by the first setting unit.

Abstract: A charge eliminating apparatus configured to remove charges from a sheet on which an image is formed by a printing apparatus, includes a charge eliminating roller pair including a first charge eliminating roller and a second charge eliminating roller configured to form a nip portion together with the first charge eliminating roller, the charge eliminating roller pair being configured to remove the charges from the sheet in a state of contacting the sheet at the nip portion, a first setting unit configured to set a value of a voltage applied to the charge eliminating roller pair, and a second setting unit configured to set whether to apply the voltage to the charge eliminating roller pair, wherein the second setting unit is configured to set whether to apply the voltage to the charge eliminating roller pair without changing the value of the voltage set by the first setting unit.

Abstract: A charge-eliminating device for eliminating charge of a sheet on which toner is fixed by an image forming apparatus includes a conveying guide, a first charge-eliminating unit and a second charge-eliminating unit. The conveying guide forms a conveyance passage through which the sheet conveyed from the image forming apparatus is conveyed. The first charge-eliminating unit is disposed on one side of the conveyance passage in a thickness direction of the sheet and eliminates charge of the sheet in a non-contact state with the sheet. The second charge-eliminating unit is disposed on the other side of the conveyance passage in the thickness direction and eliminates charge of the sheet in the non-contact state with the sheet.

Abstract: In a cross section perpendicular to a rotational axis of a first image bearing member, when a common tangential line between the first image bearing member and a second image bearing member on an intermediary transfer belt side is a rectilinear line L, a rectilinear line passing through a rotation center of the first image bearing member and a rotation center of a first transfer member is a rectilinear line P, and a rectilinear line passing through an intersection point between the rectilinear line P and the first image bearing member and perpendicular to the rectilinear line P is a rectilinear line Q, an electrode member is constituted so that the contact portion contacting an inner surface of the belt is positioned on a first image bearing member side than the rectilinear line L is and on a first transfer member side than the rectilinear line Q is.

Abstract: An image forming apparatus includes an image forming portion, a belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, an urging member, a first position changing mechanism, a storing portion, a controller, and an operating portion. The controller controls the first position changing mechanism on the basis of a kind of a recording material on which an image is formed, first set information stored in the storing portion, and first input information for changing setting of a position of the urging member inputted to the controller through the operating portion.

Abstract: An image forming apparatus includes an image forming portion, a rotatable endless belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, a guiding member, a sheet-like pressing member, and a coating member. The coating member is disposed on the pressing member so as not to contact the belt and is electrically grounded or electrically conducted to the guiding member. The coating member is formed of a material lower in surface resistivity than the pressing member.

Abstract: An image forming apparatus includes an image forming portion, a rotatable endless belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, a guiding member, a sheet-like pressing member, and a coating member. The coating member is disposed on the pressing member so as not to contact the belt and is electrically grounded or electrically conducted to the guiding member. The coating member is formed of a material lower in surface resistivity than the pressing member.

Abstract: An image forming apparatus includes an image forming portion, a belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, an urging member, a first position changing mechanism, a storing portion, a controller, and an operating portion. The controller controls the first position changing mechanism on the basis of a kind of a recording material on which an image is formed, first set information stored in the storing portion, and first input information for changing setting of a position of the urging member inputted to the controller through the operating portion.

Abstract: An intermediary transfer belt having surface resistivity ?s of 1×109 ?/square or more and volume resistivity ?v of 1×1012 ?·cm or less includes a thermoplastic resin material containing carbon black. The carbon black contained in the thermoplastic resin material has a weight ratio of 22.5-28.5 weight % and include first carbon black and second carbon black. The first carbon black of the carbon black contained in the thermoplastic resin material has a weight ratio of 50-90 weight % and dibutyl phthalate absorption of 93-127 ml/100 g, and the second carbon black of the carbon black contained in the thermoplastic resin material has a weight ratio of 10-50 weight % and dibutyl phthalate absorption of 36-79 ml/100 g.

Abstract: An image forming apparatus includes an image forming portion, a belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, an urging member, a first position changing mechanism, a storing portion, a controller, and an operating portion. The controller controls the first position changing mechanism on the basis of a kind of a recording material on which an image is formed, first set information stored in the storing portion, and first input information for changing setting of a position of the urging member inputted to the controller through the operating portion.

Abstract: An image forming apparatus includes an image forming portion, a belt, an inner roller, an outer member, an inner roller position changing mechanism, an acquiring portion, and a controller. In a case that information acquired by the acquiring portion shows that first and second recording materials are coated paper, the controller controls a position changing mechanism so that a position of the inner roller when a toner image is transferred onto the second recording material is changed to a second position. In a case that the information acquired by the acquiring portion shows that the first and second recording materials are plain paper, the controller controls the position changing mechanism so that the position of the inner roller when the toner image is transferred onto the second recording material is maintained at a first position.

Abstract: An image forming apparatus includes an image forming portion, a belt, an inner roller, an outer member, an inner roller position changing mechanism, an acquiring portion, and a controller. In a case that second information acquired by the acquiring portion shows that first and second recording materials are coated paper, the controller controls a position changing mechanism so that a position of the inner roller when a toner image is transferred onto the second recording material is changed to a second position. In a case that the second information acquired by the acquiring portion shows that the first and second recording materials are plain paper, the controller controls the position changing mechanism so that the position of the inner roller when the toner image is transferred onto the second recording material is maintained at a first position.

Abstract: An image forming apparatus includes an image forming portion, a belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, an urging member, a first position changing mechanism, a storing portion, a controller, and an operating portion. The controller controls the first position changing mechanism on the basis of a kind of a recording material on which an image is formed, first set information stored in the storing portion, and first input information for changing setting of a position of the urging member inputted to the controller through the operating portion.