Toshiba Tec Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Other

Taizo Kimoto

Osamu Takagi

Satoshi Kinouchi

Kazuhiko Kikuchi

Hiroshi Nakayama

Masahiko Ogura

Kenji Takano

Hisaaki Kawano

Noriyuki Umezawa

Noiryuki Umezawa

According to an embodiment, an image forming apparatus includes an image forming unit and a controller. The image forming unit prints an original image and a specific image in a recording medium. In a case where it is determined that the recording medium is a reused recording medium, the controller controls the image forming unit to newly print the specific image at a position different from a print position of the previously-printed specific image.

Image forming apparatus for printing an original image and an image indicating sheet reuse

An image forming apparatus includes a fixing unit that fixes an image of a toner using any one of a first toner and a second toner on a recording medium, and a control unit that sets a fixing temperature and a standby temperature of the fixing unit. The control unit sets the fixing temperature when the image of the first toner is fixed to a first temperature, sets the fixing temperature when the image of the second toner is fixed to a second temperature lower than the first temperature, and sets the standby temperature when the fixing unit is in a standby state to a temperature closer than the second temperature than the first temperature.

Image forming apparatus

The present invention provides a fixing device and a digital photocopier which can shorten the time from an instruction of starting image formation to end of fixing. The fixing device is provided in a cylinder made of metal and having a small thickness, and includes a magnetic excitation coil. When the power source is turned on, all the electric power defined by subtracting an electric power amount consumed by components other than the fixing device is supplied to the magnetic excitation coil to perform heating. As the structural components of the photocopier and auxiliary devices added to the photocopier operate, the electric power defined by subtracting, from the maximum input electric power, the electric power consumed by the structural components of the photocopier and the auxiliary devices is supplied to perform heating. In this manner, the heat roller of the fixing device is heated, in a short time, to a temperature which enables fixing, so that the time required for first copying can be shortened.

Image forming apparatus and fixing device

An electrophotographic fixing device allowing a flow of an AC current through an electromagnetic induction coil arranged close to a heating roller having a metal layer formed of a conductor and allowing the heat generation of the heating roller to heat a to-be-fixed member, in which the fixing device comprises a circuit board for outputting the AC current from an output terminal and passing the current through the electromagnetic induction coil, a conductive plate metal having one end side fixed by a fastening screw to the output terminal of the circuit board, a male-side connection terminal provided on the other end of the plate metal, and a female-side connection terminal provided at an end of a leader line of the electromagnetic induction coil and detachably connected to a male-side connection terminal.

Fixing device that is detachable from an image forming apparatus

Fixing device

A fixing device comprising an endless heating member which is adapted to be contacted with a fixable member to thereby enable an image on the fixable member to be thermally fixed, an electromagnetic inductive coil member disposed close to the endless heating member and inductively heating the endless heating member, and an AC power supply circuit supplying an AC current to the electromagnetic inductive coil member. The coil member is constructed such that in a state where the coil member is positioned in the fixing device, a ratio between an inductance L of the coil member and a load resistance R of the coil member meets a condition of L/R<50&times;10 (H/&OHgr;).

Fixing device including an electromagnetic inductive coil member providing inductive heating

An electrophotographic fixing device allowing a flow of an AC current through an electromagnetic induction coil arranged close to a heating roller having a metal layer formed of a conductor and allowing the heat generation of the heating roller to heat a to-be-fixed members. The fixing device comprises a circuit board for outputting the AC current from an output terminal and passing the current through the electromagnetic induction coil. A connection plate having a thickness twice or more the current penetration depth and having one end side fixed by a fastening screw to the output terminal of the circuit board, and a male-side connection terminal provided on the other end of the plate metal. A female-side connection terminal provided at an end of a leader line of the electromagnetic induction coil is detachably connected to the male-side connection terminal.

Fixing device having connection member for supplying AC current to an electromagnetic induction coil

The present invention is a fixing device for use in an electrophotographic apparatus arranged in a structure in which a high-frequency current is flowed through an induction coil provided close to an endless member having a metal layer made of a conductive material and the endless member is caused to generate heat to heat a material to be fixed. This fixing device is characterized in that, when a start-up operation is started by electrically conducting the induction coil, the endless member is rotated after the metal layer reaches a temperature higher than a final setting temperature, and for a predetermined time from starting rotation of the endless member, a high-frequency current having a size corresponding to a control value of a temperature lower than the final setting temperature and higher than a target temperature is supplied to the coil.

Image forming apparatus and fixing device for fixing a toner image to a fixing device

When a voltage abnormality error signal from a drive control section is at a low level, a control section determines a normal state. When the voltage abnormality error signal has arisen to a high level, the control section does not immediately determine an abnormal state and instead measures a time in which the voltage abnormality error signal is at the high level. If the measured time does not exceed a predetermined error timer value (limit value) T, the control section ignores this abnormal state as a temporary voltage abnormality. If the time in which the voltage abnormality error signal is at the high level exceeds the error timer value T, the control section determines a serviceman call error (SC) as the occurrence of voltage abnormality.

Image forming apparatus having fixing device for fixing developer image on recording medium by induction-heating heat roller

Fixing device using induction heating as a heating source

The present invention includes individually (independently) a drive control section for driving/controlling an induction heating device of a fixing device and a main-body control section for entirely controlling an electronic copying machine. The start-up processing for the induction heating device is started prior to start-up processing for parts of the main body of the electronic copying machine other than the induction heating device.

Image forming apparatus having a fixing device for fixing developer image on recording medium by subjecting heat roller to induction heating

When printing is effected on an obverse surface C of a copying paper sheet C, a scan position of a laser beam B on a photosensitive drum is shifted by a first set amount in an axial direction of the photosensitive drum relative to a predetermined reference position. The first set amount corresponds to a positional displacement amount L of the copying paper sheet C, which occurs when the copying paper sheet C is first fed to the photosensitive drum . In addition, when printing is effected on a reverse, surface C of a copying paper sheet C, a scan position of the laser beam B on the photosensitive drum is shifted by a second set amount in the axial direction of the photosensitive drum relative to a predetermined reference position. The second set amount corresponds to a positional displacement amount L of the copying paper sheet C, which occurs when the copying paper sheet C, the printing on the obverse surface of which has been finished, is fed once again to the photosensitive drum

Growing community of inventors

Tokyo, Japan

Taizo Kimoto