Abstract: An image forming apparatus includes a controller to execute a first mode for forming a toner image on a recording medium, in which a maximum toner carrying amount per unit area is a first maximum toner carrying amount, and a second mode for forming a toner image on the recording medium, in which the maximum toner carrying amount per unit is a second maximum toner carrying amount larger than the first maximum toner carrying amount. In the first mode, the controller sets a circumferential speed ratio of the toner bearing member against an image bearing member at a first circumferential speed ratio, and in the second mode the controller sets the circumferential speed ratio at a second circumferential speed ratio higher than the first circumferential speed ratio. The controller executes the second mode upon an order of the second mode by an operator.

Abstract: An image forming apparatus includes a controller to execute a first mode for forming a toner image on a recording medium, in which a maximum toner carrying amount per unit area is a first maximum toner carrying amount, and a second mode for forming a toner image on the recording medium, in which the maximum toner carrying amount per unit is a second maximum toner carrying amount larger than the first maximum toner carrying amount. In the first mode, the controller sets a circumferential speed ratio of the toner bearing member against an image bearing member at a first circumferential speed ratio, and in the second mode the controller sets the circumferential speed ratio at a second circumferential speed ratio higher than the first circumferential speed ratio. The controller executes the second mode upon an order of the second mode by an operator.

Abstract: Provided is an image forming apparatus including an image bearing member, a developing device, a bias applying portion, a driving portion, a transfer device, and a controller. In a case where the length of the recording material is a second length larger than a first length, the controller controls the speed ratio of the driving speed of the developer bearing member to the image bearing member to be a second speed ratio larger than a first speed ratio and controls the residual developer amount born per unit area of the developer bearing member after the developing of the electrostatic image becomes a second developer amount larger than a first developer amount.

Abstract: The present invention includes a compressor for generating compressed air for separating a sheet from a fixing portion. By using the compressed air generated by the compressor, an image forming portion, more specifically, for example, a charger, is cleaned.

Abstract: The present invention includes a compressor for generating compressed air for separating a sheet from a fixing portion. By using the compressed air generated by the compressor, an image forming portion, more specifically, for example, a charger, is cleaned.

Abstract: Provided is an image forming apparatus including an image bearing member, a developing device, a bias applying portion, a driving portion, a transfer device, and a controller. In a case where the length of the recording material is a second length larger than a first length, the controller controls the speed ratio of the driving speed of the developer bearing member to the image bearing member to be a second speed ratio larger than a first speed ratio and controls the residual developer amount born per unit area of the developer bearing member after the developing of the electrostatic image becomes a second developer amount larger than a first developer amount.

Abstract: A fixing apparatus that fixes a toner image on a sheet includes each of fans configured to respectively cool areas adjacent to a longitudinal center and longitudinal both ends of a pressure roller, and in a case where fixing processing is performed on thin paper of a maximum width size, includes a first mode in which the fixing processing is started after the fan configured to cool the area adjacent to the longitudinal center of the pressure roller is actuated for a predetermined time and a second mode in which the fixing processing is started after the fan configured to cool the area adjacent to the longitudinal both ends of the pressure roller is actuated for a predetermined time.

Abstract: An image heating apparatus includes: an endless belt configured to heat a toner image on a recording material at a nip; an electroconductive portion provided along a circumferential direction of the endless belt at a longitudinal end portion of the endless belt; a first contact portion and a second contact portion which contact the electroconductive portion at different positions with respect to the circumferential direction; an electric voltage supplying portion configured to supply an electric voltage to the electroconductive portion through the first contact portion; and a detecting portion configured to detect, whether or not electrical conduction is established, through the second contact portion.

Abstract: An image forming apparatus is provided which realizes an adequate operation of a paper dust removing device. The image forming apparatus has a storing portion which stores the likelihood that paper dust is produced upon previous image formation as previous paper dust production information according to the type of sheet. Further, the image forming apparatus has a CPU which adjusts paper dust removing performance upon current image formation to increase based on previous paper dust production information when the likelihood that paper dust is produced upon previous image formation is higher. Consequently, it is possible to realize an adequate paper dust removing operation of the paper dust removing device and prevent problems of images from occurring due to paper dust.

Abstract: An image heating apparatus includes an image heating rotational member configured to heat an image on a recording material, a pressure member configured to form a nip portion with the image heating rotational member and pinch the heated recording material in the nip portion, a first external heater including a first heat generation member and configured to contact an outer surface of the image heating rotational member and heat an area of the image heating rotational member that has passed the nip portion, and a second external heater including a second heat generation member and configured to contact an outer surface of the image heating rotational member and heat an area of the image heating rotational member heated by the first external heater. In the image heating apparatus, maximum power applied to the second heat generation member is smaller than maximum power applied to the first heat generation member.

Abstract: An image heating device includes: a rotatable heater for heating an image on a recording material; a pressor for pressing the heater to form a nip in which the recording material is to be nip-conveyed; a belt for heating and contacting the heater; a first member for heating the belt while pressing the belt against the heater; a second member, provided downstream of the first member with respect to a rotational direction of the heater, for heating the belt while pressing the belt against the heater; a first portion for heating the first member by energization; and a second portion for heating the second member by energization. Each of the first and second portions is supplied with power so that a maximum of the power supplied to the first means is smaller than that of the power supplied to the second portion.

Abstract: A fixing apparatus that fixes a toner image on a sheet includes each of fans configured to respectively cool areas adjacent to a longitudinal center and longitudinal both ends of a pressure roller, and in a case where fixing processing is performed on thin paper of a maximum width size, includes a first mode in which the fixing processing is started after the fan configured to cool the area adjacent to the longitudinal center of the pressure roller is actuated for a predetermined time and a second mode in which the fixing processing is started after the fan configured to cool the area adjacent to the longitudinal both ends of the pressure roller is actuated for a predetermined time.

Abstract: An image forming apparatus includes: a device for forming a toner image on a sheet; a heater contacting and heating the toner image on the sheet; a detector for detecting a temperature of the heater a controller for controlling the heater to maintain the temperature of the heater at a target temperature based on an output of the detector; a selector for selecting a first mode continuously forming images on thin sheets, a second mode continuously forming images on thick sheets, and a third mode continuously forming images on the thin sheet and the thick sheet; and a setter for setting the target temperature based on the selected mode, wherein the target temperature in the second mode is higher than the target temperature in the first mode, and the target temperature in the third mode is higher than the target temperature in the second mode.

Abstract: An image heating apparatus includes an image heating rotational member configured to heat an image on a recording material, a pressure member configured to form a nip portion with the image heating rotational member and pinch the heated recording material in the nip portion, a first external heater including a first heat generation member and configured to contact an outer surface of the image heating rotational member and heat an area of the image heating rotational member that has passed the nip portion, and a second external heater including a second heat generation member and configured to contact an outer surface of the image heating rotational member and heat an area of the image heating rotational member heated by the first external heater. In the image heating apparatus, maximum power applied to the second heat generation member is smaller than maximum power applied to the first heat generation member.

Abstract: An image heating apparatus includes an image heating rotational member configured to heat an image on a recording material, a pressure member configured to form a nip portion with the image heating rotational member and pinch the heated recording material in the nip portion, a first external heater including a first heat generation member and configured to contact an outer surface of the image heating rotational member and heat an area of the image heating rotational member that has passed the nip portion, and a second external heater including a second heat generation member and configured to contact an outer surface of the image heating rotational member and heat an area of the image heating rotational member heated by the first external heater. In the image heating apparatus, maximum power applied to the second heat generation member is smaller than maximum power applied to the first heat generation member.

Abstract: An image forming apparatus is provided which realizes an adequate operation of a paper dust removing device. The image forming apparatus has a storing portion which stores the likelihood that paper dust is produced upon previous image formation as previous paper dust production information according to the type of sheet. Further, the image forming apparatus has a CPU which adjusts paper dust removing performance upon current image formation to increase based on previous paper dust production information when the likelihood that paper dust is produced upon previous image formation is higher. Consequently, it is possible to realize an adequate paper dust removing operation of the paper dust removing device and prevent problems of images from occurring due to paper dust.

Abstract: An image heating device includes a rotatable image heating member for heating an image on a recording material; a pressing member for pressing the image heating member to form a nip in which the recording material is to be nip-conveyed; a belt member for heating the image heating member in contact with the image heating member; a first belt heating member for heating the belt member while pressing the belt against the image heating member; a second belt heating member, provided downstream of the first belt heating member with respect to a rotational direction of the image heating member, for heating the belt member while pressing the belt member against the image heating member; a first heating portion for heating the first belt heating member by energization; and a second heating portion for heating the second belt heating member by energization.

Abstract: An image forming apparatus is constituted by a dark color image forming station for forming an image with such a toner of recording materials having the same hue and different lightness as has a lower lightness; a light color image forming station for forming an image with such a toner of the recording materials having the same hue and different lightness as has a higher lightness; and a control portion for effecting control so that an image to be emphasized by partly disappearing or by relatively and partly decreasing in density is formable substantially only with the toner having the higher lightness.

Abstract: An image forming apparatus includes an image forming device configured to form a toner image on a sheet; an image heating device disposed contacted with the toner image on the sheet and configured to heat the toner image on the sheet; a heating device configured to heat the image heating device; a detecting device configured to detect a temperature of the image heating device; a controlling device configured to control the heating device so that the temperature of the image heating device is maintained at a target temperature based on an output of the detecting device; a selecting device configured to select one of plurality of modes including a first mode in which the images are continuously formed on a plurality of thin sheets, a second mode in which the images are continuously formed on a plurality of thick sheets and a third mode in which the images are continuously formed on a plurality of sheets including the thin sheet and the thick sheet; a setting device configured to set the target temperature based

Abstract: An image forming apparatus capable of performing can perform an image forming operation together with temperature rise by heating of a heat fixing apparatus operation to ensure a good fixability and a shortest short first print out time and to prevent loss of while minimizing power consumption without and not over-burdening a constitutional member of the image forming apparatus (e.g., life-shortening shortening the life of the constitutional member)is provided. The image forming apparatus includes an image forming unit and a fixing apparatus unit for heat-fixing a toner image on a recording material and a detection member for detecting a toner of a fixing apparatus member and performs simultaneously temperature rise by heating of the fixing apparatus and an image forming operation including a pre-process and an image forming sequence.