Abstract: Disclosed a cleaning apparatus including: a brush to remove an adhered matter adhered to a photoconductor drum; wherein the brush includes: a first brush portion which contacts an end portion of the photoconductor drum in an axial direction, which portions is on a circumferential surface of the photoconductor drum, and in which portion a conductive base substance is exposed; and a second brush portion which contacts only a photosensitive layer on the circumferential surface of the photoconductor drum, and an electric resistance value of the first brush portion is larger than that of the second brush when a bias current is applied.

Abstract: An induction heating type of fixing device to fix a recording material having a toner image thereon, having a heating member, an induction coil divided into a plurality of parts, a temperature detector for detecting a temperature of the heating member, a signal generator for generating a switching signal that periodically controls permission and prohibition of energization of each of the divided induction coils, and a controller for controlling supply of a driving current to each of the divided induction coils to heat the heating member. The controller controls the energization by periodically switching the driving current to each of the divided induction coils on the basis of an energization signal that determines the permission and the inhibition of the driving currents according to a signal of temperature detected by the temperature detector, and the switching signal.

Abstract: An electrophotographic image forming apparatus includes a fixing unit having a heat roller and a press roller which abuts against and presses the heat roller. The image forming apparatus further includes at least one cleaning unit including a backup roller which abuts against and presses the heat roller in order to remove remaining toner attaching to a surface of the heat roller. The backup roller has a two-layer structure of a metal shaft core and a resilient layer, as an outer layer for the shaft core, made of a resilient body. The diameter of the backup roller gradually reduces from a projecting axial center of 10 mm to 30 mm toward two axial ends, so that an entire outer shape of the backup roller forms a crown or spindle like shape.

Abstract: An induction heating type of fixing device to fix a recording material having a toner image thereon, having a heating member, an induction coil divided into a plurality of parts, a temperature detector for detecting a temperature of the heating member, a signal generator for generating a switching signal that periodically controls permission and prohibition of energization of each of the divided induction coils, and a controller for controlling supply of a driving current to each of the divided induction coils to heat the heating member. The controller controls the energization by periodically switching the driving current to each of the divided induction coils on the basis of an energization signal that determines the permission and the inhibition of the driving currents according to a signal of temperature detected by the temperature detector, and the switching signal.

Abstract: A method of controlling a fixing temperature of a fixing device having a heat roller provided with a heat source and a first temperature detector provided at the vicinity of the heat roller, and having a pressure roller, which is in pressure contact with the heat roller, provided with a second temperature sensor at the vicinity of the pressure roller, having the steps of; detecting a temperature of the pressure roller by the second temperature detector; and varying a control temperature of the heat roller according to a detected temperature of the pressure roller.

Abstract: This invention relates to an electrophotographic image forming apparatus including a fixing unit having a heat roller and a press roller which abuts against and presses the heat roller. The image forming the apparatus further includes at least one cleaning unit including a backup roller which abuts against and presses the heat roller in order to remove remaining toner attaching to a surface of the heat roller. The backup roller has a two-layer structure of a metal shaft core and a resilient layer, as an outer layer for the shaft core, made of a resilient body. The diameter of the backup roller gradually reduces from a projecting axial center of 10 mm to 30 mm toward two axial ends, so that an entire outer shape of the backup roller forms a crown- or spindle-like shape.

Abstract: A method of controlling a fixing temperature of a fixing device having a heat roller provided with a heat source and a first temperature detector provided at the vicinity of the heat roller, and having a pressure roller, which is in pressure contact with the heat roller, provided with a second temperature sensor at the vicinity of the pressure roller, having the steps of; detecting a temperature of the pressure roller by the second temperature detector; and varying a control temperature of the heat roller according to a detected temperature of the pressure roller.

Abstract: In a toner image fixing device, there are provided an endless belt being looped up around a heating roller and a conveyance roller, a pressure roller for pressing a sheet having a toner image onto the heating roller with the endless belt intervening between the pressure roller and the heating roller. A sensor is disposed inside the loop of the belt so as to come in contact with the heating roller, for detecting the temperature of the heating roller. The fixing temperature for the toner image is controlled on the basis of the temperature of the heating roller detected by the sensor. A first nip region is formed on a pressing portion located between the heating roller and the fixing roller. A second nip region is formed between the belt and the fixing roller, continuing from the first nip region but without contacting the heating roller.

Abstract: A cleaning system for an electrostatic copying apparatus has a cleaning roller in pressure contact with a toner supporting member for removing residual toner therefrom. The cleaning roller is impressed with a bias voltage of polarity opposite to the electric charge held by the residual toner. The cleaning roller comprises an axle, a conductive elastic layer around the axle, and a thin porous film formed as an outer most layer over the elastic layer. The thin film is preferably made of polytetrafluorethylene and is a porous and soft film. The cleaning system also includes a discharging electrode arranged before the cleaning roller, and a scraper for removing toner adhering to the cleaning roller.

Abstract: A cleaning device in which toner remaining on an image reproducing support through an electrostatic reproducing process is cleaned by a fur brush and then the toner having adhered to the fur brush is recovered by an electrically biased roller, the fur brush having a brush core formed of a conductive material and the brush core being grounded or biased with the polarity opposite to that of bias voltage applied to the roller. The fur brush is formed as a conductive brush and grounded through a non-linear resistance element. The fur brush is formed of a semiconductive material.

Abstract: A magnetic brush cleaning device in which a magnetic attraction roller having a surface for attracting magnetic powder is disposed so as to face the surface of a toner image retaining member through a gap D, the height of a brushlike ear of the magnetic powder attracted to the magnetic attraction roller is restricted by ear restriction element faced to the surface of the magnetic attraction roller through a gap H and the brushlike ear of the magnetic powder thus restricted slides frictionally on the surface of the toner image retaining member so as to remove the toner on the surface of the image retaining member. The gap D and the gap H satisfy the following relation:0.4 mm.ltoreq.H.ltoreq.D.ltoreq.H+0.4 mm.The magnetic powder is an insulating carrier, the gap D is from 0.5 mm to 1.5 mm at the brushing position and a voltage of 800 V to 1,600 V of a polarity which electrically attracts the toner is applied to the surface of the magnetic attraction member.

Abstract: A method of controlling the luminous intensity of a fluorescent lamp of the reproducing apparatus characterized in that a first stage for detecting the amount of light from the fluorescent lamp is linked with a second stage for controlling the lamp current of the fluorescent lamp by use of an output corresponding to the detection output of the first stage as the input. A luminous intensity controlling apparatus for fluorescent lamp of the reproducing apparatus characterized in that the fluorescent lamp is a cold cathode type fluorescent lamp, and luminosity detection device for detecting the amount of light from the cold cathode type fluorescent lamp and lamp current control device for controlling the lamp current of the cold cathode type fluorescent lamp using an output corresponding to the detection output of the luminosity detection device as the input are linked with each other.

Abstract: A recording apparatus having a roller type fixing device made up of a first roller and a second roller for fixing the image to the transfer paper. The recording apparatus has an upper guide plate placed over the transfer paper passage on the inlet side of the roller type fixing device, the upper guide plate being curved down gradually toward the front end and extending near the lower portion of the first roller. The upper guide plate has on its underside a plurality of projecting strips extending in the direction of the paper feed.