Abstract: An image formation apparatus comprising: a belt member suspended by a plurality of supporting rotating bodies and thus rotating; a cleaning member removing toner adhering to the belt member; a tray receiving waste toner removed from the belt member by the cleaning member; a vibration mechanism vibrating the tray to move the waste toner toward a lower side of the tray; a steering control mechanism to perform movement control to move the belt member in an axial direction of the supporting rotating bodies while the belt member rotates; and a vibration adjustment mechanism to change a manner of vibration of the vibration mechanism, based on the movement control by the steering control mechanism.

Abstract: An image forming apparatus includes: an image holder that holds a toner image; a transferer that is disposed opposite to the image holder so as to be in contact with the image holder and transfers the toner image from the image holder onto a recording sheet that is going through a contact part where the transferer contacts the image holder, by applying a transfer voltage between the transferer and the image holder; a first power source that applies a voltage of a first polarity to the image holder; and a second power source that applies a voltage of a second polarity, which is reverse to the first polarity, to the transferer.

Abstract: An image formation apparatus comprising: a belt member suspended by a plurality of supporting rotating bodies and thus rotating; a cleaning member removing toner adhering to the belt member; a tray receiving waste toner removed from the belt member by the cleaning member; a vibration mechanism vibrating the tray to move the waste toner toward a lower side of the tray; a steering control mechanism to perform movement control to move the belt member in an axial direction of the supporting rotating bodies while the belt member rotates; and a vibration adjustment mechanism to change a manner of vibration of the vibration mechanism, based on the movement control by the steering control mechanism.

Abstract: An induction heating device includes: a resonant circuit provided with a coil heating a workpiece inductively and a capacitor, the coil and the capacitor being coupled in parallel with each other; a switching element coupled in series with the resonant circuit; a power supply which applies to the resonant circuit, a direct-current input voltage whose instantaneous value can be changed with the lapse of time; and a power controller which controls power to the workpiece by turning the switching element ON at a certain time and changing an ON period of the switching element, and the power controller is characterized by turning the switching element ON with a delay of an integral multiple of a resonant period of the resonant circuit if a value of power to the workpiece is equal to or lower than a first threshold which is predetermined.

Abstract: An image forming apparatus having: a power source applying alternating current voltage to the magnetizing coil; a demagnetizing coil switchable between a conductive state and a cutoff state, and when in the conductive state, cancelling out a portion of a magnetic flux produced by the magnetizing coil; a contact switch and a semiconductor switch electrically connected in parallel, and, in combination, bringing the demagnetizing coil into the conductive state or the cutoff state; and a control unit opening or closing the switches separately. The control unit: opens or closes the semiconductor switch in synchronization with a zero-crossing of the alternating current voltage at least when the contact switch is open; opens or closes the contact switch only when the semiconductor switch is closed; and opens the semiconductor switch when the demagnetizing coil brought into the conductive state by the contact switch needs to be maintained in the conductive state.

Abstract: An electromagnetic induction heating apparatus comprises: a resonance circuit that includes a inductor and a capacitor; a direct-current electric power supply; and a switching element performing ON and OFF switching of electric power supplied to the resonance circuit by the direct-current electric power supply; performs intermittent control of the electric power supply by controlling the ON and OFF switching at regular intervals, and by performing control to stop the electric power supply when not controlling the ON and OFF switching, wherein during the intermittent control, the switching control unit performs gradual control such that, upon beginning the control of the ON and OFF switching, the electric power supply gradually increases to reach a target value, and upon stopping the control of the ON and OFF switching, the electric power supply gradually decreases from the target value until stopping, such that the gradual decrease involves fewer steps than the gradual increase.

Abstract: An image forming apparatus includes a timing roller for conveying paper in the image forming apparatus, a first motor receiving supply of electric power from a power source for driving the timing roller, a second motor receiving supply of electric power from the power source, a sensor for detecting whether a jam occurs at the conveyance roller, a drive relay for cutting off supply of electric power from the power source to the first and second motors, if occurrence of a jam is detected, and a control circuit for controlling an operating state of the second motor such that regenerative power produced at the first motor due to rotation of the conveyance roller is supplied to the second motor, if occurrence of a jam is detected.

Abstract: An induction heating device including a coil which inductively heats a workpiece of a fuser with an input voltage obtained from an alternating current voltage by rectification; a switching element coupled in series with the coil; a peak voltage detector which detects a peak value of the input voltage; an effective voltage detector which detects an effective value of the input voltage; a crest factor calculator which calculates an actual crest factor of the input voltage based on the peak value of the input voltage and the effective value of the input voltage; and a power controller which achieves control of power to the fuser by controlling the duty ratio of ON and OFF periods of the switching element.

Abstract: An image forming apparatus having: a power source applying alternating current voltage to the magnetizing coil; a demagnetizing coil switchable between a conductive state and a cutoff state, and when in the conductive state, cancelling out a portion of a magnetic flux produced by the magnetizing coil; a contact switch and a semiconductor switch electrically connected in parallel, and, in combination, bringing the demagnetizing coil into the conductive state or the cutoff state; and a control unit opening or closing the switches separately. The control unit: opens or closes the semiconductor switch in synchronization with a zero-crossing of the alternating current voltage at least when the contact switch is open; opens or closes the contact switch only when the semiconductor switch is closed; and opens the semiconductor switch when the demagnetizing coil brought into the conductive state by the contact switch needs to be maintained in the conductive state.

Abstract: An image forming apparatus includes a timing roller for conveying paper in the image forming apparatus, a first motor receiving supply of electric power from a power source for driving the timing roller, a second motor receiving supply of electric power from the power source, a sensor for detecting whether a jam occurs at the conveyance roller, a drive relay for cutting off supply of electric power from the power source to the first and second motors, if occurrence of a jam is detected, and a control circuit for controlling an operating state of the second motor such that regenerative power produced at the first motor due to rotation of the conveyance roller is supplied to the second motor, if occurrence of a jam is detected.

Abstract: An electromagnetic induction heating apparatus comprises: a resonance circuit that includes a inductor and a capacitor; a direct-current electric power supply; and a switching element performing ON and OFF switching of electric power supplied to the resonance circuit by the direct-current electric power supply; performs intermittent control of the electric power supply by controlling the ON and OFF switching at regular intervals, and by performing control to stop the electric power supply when not controlling the ON and OFF switching, wherein during the intermittent control, the switching control unit performs gradual control such that, upon beginning the control of the ON and OFF switching, the electric power supply gradually increases to reach a target value, and upon stopping the control of the ON and OFF switching, the electric power supply gradually decreases from the target value until stopping, such that the gradual decrease involves fewer steps than the gradual increase.

Abstract: An induction heating device including a coil which inductively heats a workpiece of a fuser with an input voltage obtained from an alternating current voltage by rectification; a switching element coupled in series with the coil; a peak voltage detector which detects a peak value of the input voltage; an effective voltage detector which detects an effective value of the input voltage; a crest factor calculator which calculates an actual crest factor of the input voltage based on the peak value of the input voltage and the effective value of the input voltage; and a power controller which achieves control of power to the fuser by controlling the duty ratio of ON and OFF periods of the switching element.

Abstract: An induction heating device comprises: a resonant circuit provided with a coil heating a workpiece inductively and a capacitor, the coil and the capacitor being coupled in parallel with each other; a switching element coupled in series with the resonant circuit; a power supply which applies to the resonant circuit, a direct-current input voltage whose instantaneous value can be changed with the lapse of time; and a power controller which controls power to the workpiece by turning the switching element ON at a certain time and changing an ON period of the switching element, and the power controller is characterized by turning the switching element ON with a delay of an integral multiple of a resonant period of the resonant circuit if a value of power to the workpiece is equal to or lower than a first threshold which is predetermined.

Abstract: Disclosed is an image forming apparatus to form an image on a paper, comprising: a main body section including a housing to house an apparatus to perform processing for the paper, and a control circuit to control the apparatus housed in the housing; and a peripheral apparatus provided separately from the main body section, which includes a hardware module having an electric component, and is connected to the control circuit so that communication therebetween is performed, and which is detachably provided to the housing, wherein a position at which the peripheral apparatus is provided to the housing can be changed, wherein the housing and the peripheral apparatus respectively include a conductive material, and the conductive material of the housing is grounded, and wherein when the peripheral apparatus is provided to the housing, the conductive material of the housing is conductive with the conductive material of the peripheral apparatus.