Abstract: An image forming apparatus which predicts VL fluctuations of a photosensitive drum in consideration of a double-sided print mode, and performs an image formation control based on the prediction, and thus always obtains a stable density image. The image forming apparatus performs an appropriate image formation control by controlling an image forming condition based on a photosensitive member rotation time, a photosensitive member stop time, a temperature of an atmospheric environment, an absolute humidity of the atmospheric environment, and whether an image formation that precedes a subsequent image formation is performed in single-sided printing or double-sided printing.

Abstract: There is provided an image forming apparatus which shortens the time taken for circumference detection and measures the circumference at high precision without obstructing downsizing of the apparatus. To accomplish this, the image forming apparatus detects, at an arbitrary timing, the physical pattern of the image-formed surface of a rotation member that changes over time. In the second round, the image forming apparatus detects the second pattern at a timing a predetermined time after the arbitrary timing. By using the detected patterns, the image forming apparatus obtains information associated with the circumference of the rotation member.

Abstract: An image forming apparatus which predicts VL fluctuates of a photosensitive drum, taking a rotation speed of the photosensitive drum during image formation into consideration, and controls the image formation based on the prediction, for always obtaining an image of a stable density. The image forming apparatus performs appropriate image formation control by controlling image forming conditions based on a photosensitive member rotation time, a photosensitive member stop time, a temperature of the environment, an absolute humidity of the environment, and the rotation speed of the photosensitive member.

Abstract: An image forming apparatus includes an image bearing member for carrying a toner image; an image forming unit for forming a toner image on the image bearing member; a transfer material carrying member, for carrying a transfer material, wherein the toner image is transferred onto a transfer material carried on the transfer material carrying member or onto the transfer material carrying member; a density detecting unit for detecting a density of the toner image transferred to the transfer material carrying member; wherein a transfer intensity is smaller when the toner image for density detection is transferred onto the transfer material carrying member than when the toner image is transferred onto the transfer material carried on the transfer material carrying member.

Abstract: An image heating device for heating an image formed on a recording material is provided which has a heating member; an excitation coil for generating a magnetic field to induce an eddy current in the heating member; a temperature detecting member for detecting a temperature of the heating member, the temperature detecting member being arranged at a position in opposition to a heat generation area of the heating member; and an insulating holder that holds the temperature detecting member.

Abstract: An image forming apparatus includes a first image bearing member and a second shiftable image bearing member. A first transferring member transfers a toner image formed on the first image bearing member to the second image bearing member at a first region. A second transferring member transfers a toner image formed on the second image bearing member to a transferring material at a second region. A first electrifier is provided downstream of the second region and upstream of the first region in a shifting direction of the second image bearing member. A second electrifier is provided downstream of the second region and upstream of the first electrifier in the shifting direction. A voltage applying unit applies a voltage to the first and second electrifiers to transfer toner adhered to the first and second electrifiers onto the second image bearing member.

Abstract: The present invention has an object for preventing toner from adhering to an electrifying member for electrifying the toner remaining on an image bearing member to cause deterioration of electrifying performance, and, to this end, an image forming apparatus according to the present invention includes a first image bearing member, a second shiftable image bearing member, a first transferring member for transferring a toner image on the first image bearing member to the second image bearing member at a first transferring portion, a second transferring member for transferring the toner image on the second image bearing member to a transferring material at a second transferring portion, a first electrifying member provided at a downstream side of the second transferring portion and at an upstream side of the first transferring portion in a shifting direction of the second image bearing member, a second electrifying member provided at a downstream side of the second transferring portion and at an upstream side of

Abstract: An image heating device includes: a heating member having a heater that is in contact with a bearing member, which bears an image, and heats the image, a first temperature detecting member that is disposed above a surface of the heating member with a gap therebetween and detects a temperature of the heating member, a second temperature detecting member that is disposed in contact with the surface of the heating member and detects a temperature of the heating member and a controller for controlling a supply of a power to the heater on the basis of a detected output of the first and second temperature detecting members, wherein the controller controls the supply of the power to the heater on the basis of the detected output of the first temperature detecting member at the time of heating the image and controls the supply of the power to the heater on the basis of the detected output of the second temperature detecting member at a time of standby.

Abstract: An image heating device for heating an image formed on a recording material is provided which comprises a heating member; an excitation coil for generating a magnetic field to induce an eddy current in the heating member; a temperature detecting member for detecting a temperature of the heating member, the temperature detecting member being arranged at a position in opposition to a heat generation area of the heating member; and an insulating holder that holds the temperature detecting member.

Abstract: An image heating device includes: a heating member having a heater that is in contact with a bearing member, which bears an image, and heats the image, a first temperature detecting member that is disposed above a surface of the heating member with a gap therebetween and detects a temperature of the heating member, a second temperature detecting member that is disposed in contact with the surface of the heating member and detects a temperature of the heating member and a controller for controlling a supply of a power to the heater on the basis of a detected output of the first and second temperature detecting members, wherein the controller controls the supply of the power to the heater on the basis of the detected output of the first temperature detecting member at the time of heating the image and controls the supply of the power to the heater on the basis of the detected output of the second temperature detecting member at a time of standby.

Abstract: An image heating apparatus has a first member; a second member slidable relative to the first member; a third member for forming a nip with the first member with the second member disposed therebetween, wherein a recording material carrying an image is nipped and red by the nip between the second member and the third member, a pressure control unit for controlling a pressure at the nip to set the pressure to a first pressure and a second pressure which is higher than the first pressure, wherein when the second member starts moving upon start of image heating operation, the control unit sets the pressure to the first pressure and then to the second pressure.

Abstract: The present invention provides an image heating apparatus which has a rotary member, magnetic flux generating device for generating a magnetic flux, and wherein an eddy current is generated in the rotary member by the magnetic flux generated by the magnetic flux generating device, the rotary member generates heat by the eddy current and an image on a recording material is heated by the heat, a heat conducting member being in contact with the rotary member, wherein, when, with respec to a direction perpendicular to a moving direction of the rotary member, Lh being a length of a heat generating region of the rotary member, Lf being a length of the rotary member, and L being length of the heat conducting member, Lh≦L≦Lf is satisfied.

Abstract: A fixing apparatus for use in an image forming apparatus such as a copying apparatus or a laser beam printer is disclosed. The fixing apparatus has a heater, a rotatable member having the heater therein, and a pressing member forming a nip by coming into contact with the rotatable member. The rotatable member is provided with a core and an elastic layer formed on the core, and the elastic layer has a JIS-A Standard rubber hardness not more than 5.degree..

Abstract: An image forming apparatus includes an image bearing member for carrying a toner image; an image forming unit for forming a toner test image on the image bearing member; a transfer material carrying member, for carrying a transfer material, wherein the test toner image is transferred onto a transfer material carried on the transfer material carrying member or onto the transfer material carrying member; and a density detecting unit for detecting a density of the toner test image transferred to the transfer material carrying member. A transfer intensity is smaller when the toner test image for density detection is transferred onto the transfer material carrying member than when the toner test image is transferred onto the transfer material tarried an the transfer material carrying member. The transfer intensity also changes depending on whether the transferred toner test image is the first color toner test image or the second toner test image, and depending on an ambient condition sensor.

Abstract: An image forming apparatus includes an image bearing member for electrostatically bearing a toner image; a dielectric member movable along an endless path through a transfer position of the image bearing member; an electroconductive member in contact with the dielectric member at a side remote from the image bearing member, wherein the electroconductive member is supplied with a voltage having a polarity opposite from that of a charge polarity of the toner image to transfer the toner image from the image bearing member onto the dielectric member at the transfer position; wherein the electroconductive member is electrically grounded to generate an electric field for transferring the toner from the dielectric member to the image bearing member at the transfer position.

Abstract: An image forming apparatus has a recording medium bearing member bearing a recording medium thereon and rotatable, the recording medium bearing member having in the surface thereof a recess extending in the direction of the rotary shaft thereof, image formation being effected on the recording medium born on the recording medium bearing member, and a rotatable member abutted against the recording medium bearing member, the rotatable member being provided with a abutting portion abutted against the recording medium bearing member, and a regulating portion adapted to abut against the recording medium bearing member when the recess and the rotatable member become opposed to each other. Thus, the distance between the recess and the bearing portion, is regulated the rotatable member being movable between a first position in which the abutting portion abuts against the recording medium bearing member and a second position in which the regulating portion abuts against the recording medium bearing member.

Abstract: An image forming apparatus has an image bearing member bearing images thereon and movable, and a transfer medium bearing member provided in pressure contact with the image bearing member and bearing a transfer medium thereon and rotatable. The transfer medium bearing member has a sheet member for bearing the transfer medium thereon, and an elastic layer supporting that area of the sheet member bearing the transfer medium thereon from the inside of the sheet member. A voltage is applied to the transfer medium bearing member to transfer the images on the image bearing member to the transfer medium born on the sheet member. The sheet member has an area not fixed to the elastic layer. The transfer medium bearing member is rotated with a potential difference created between the image bearing member and the sheet member before the operation of transferring the images on the image bearing member to the transfer medium born on the sheet member is started.

Abstract: A fixating device has a first rotatable member in contact with an unfixated image borne on a recording medium, a second rotatable member forming a nip together with the second rotatable member, a first heater for heating the first rotatable member, a second heater for heating the second rotatable member, and power supply controlling means for controlling the supply of electric power to the first heater and the second heater. The power supply controlling means is adapted to control the supply of electric power so that when the electric power supplied to the first heater is Wa and the electric power supplied to the second heater is Wb and the ratio when the recording medium is nipped between and conveyed by the first rotatable member and the second rotatable member is Dp=Wa/Wb and the ratio during standby is Ds=Wa/Wb, there may be established Dp>Ds.