Patent application number | Description | Published |
20130142549 | IMAGE FORMING APPARATUS - The image forming apparatus includes a plurality of image forming devices that includes a developing device and a transferring device, an exposure unit irradiating the image bearing member with a laser beam, a detector detecting a toner image for detection, and a CPU for detecting and correcting the positional deviation of each color, wherein the CPU forms the toner image for detection on a color-by-color basis between pages in a print job including plural pages of images, and corrects times Trv and Tv from timing on which a subscanning image-writing timing synchronizing signal is output to timing on which a laser unit emits a laser beam based on times Ty to Tk between timing on which the subscanning image-writing timing synchronizing signal is output and timing on which the color misregistration detection sensor detects the misregistration detection pattern. | 06-06-2013 |
20140093268 | IMAGE FORMING APPARATUS - An image forming apparatus includes: a fixing portion for fixing an image, formed on a recording material, on the recording material, wherein the fixing portion includes a heater for generating heat by electric power supplied from a commercial power source; a power source portion for supplying the electric power to a load except the heater, wherein the power source and the heater are connected with the commercial power source in parallel; a suppliable electric power calculating portion for calculating suppliable electric power suppliable to the heater; and a temperature setting portion for setting, depending on the suppliable electric power calculated by the calculating portion, a control target temperature of the fixing portion in an operation in a stand-by mode in which the image forming apparatus awaits a print instruction. | 04-03-2014 |
20140341599 | IMAGE HEATING DEVICE - An image heating device includes first and second heating elements, a temperature detection element, and an electric power controller. The electric power controller controls electric power to be supplied to the both heating elements for each control cycle corresponding to a period including a plurality of consecutive half cycles of alternate current per a detected temperature. The electric power controller controls electric power such that a current having a waveform including first half cycles and a second half cycle is supplied to both heating elements. The electric power controller sets a first control pattern such that the first and second half cycles overlap with each other in the half cycles of same phases in supplied alternate current and sets a second control pattern such that the first half cycles overlap with each other and the second half cycles overlap with each other in the half cycles of the same phases. | 11-20-2014 |
20150043934 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming unit, a fixing unit having a heater, a temperature detection unit, a power control unit, and a conveyance control unit that controls conveying a recording material. The conveyance control unit executes, when the maximum power is greater than a threshold power, a first mode where conveyance is performed according to a time, and executes, in a case where the maximum power is less than the threshold power, a second mode where conveyance is performed according to the detected temperature. The power control unit sets a larger value to the threshold power when an option device is connected to the image forming apparatus as compared to when the option device is not connected to the image forming apparatus. | 02-12-2015 |
20150093134 | IMAGE FORMING APPARATUS - An image forming apparatus includes: a power source portion; a fixing portion; and a controller. The controller sets a waveform of a current to be passed through each of first and second heat-generating-elements of the fixing portion in one-control-period so that, in an equiphase half wave in one control period, the current passes through one heat-generating-element from a halfway point of the half wave and the current passes through or does not pass through the other heat-generating-element throughout a half wave period. The controller sets a current supply starting timing of the current passing through the one heat-generating-element, at timing when a current passing toward the power source portion stops. | 04-02-2015 |
20160026127 | FIXING APPARATUS - A fixing apparatus configured to include a rotational member having a conductive layer, a coil having a helical shape, a resonance circuit including a resonance capacitor and configured to be formed together with the rotational member and the coil, a first converter driving the resonance circuit, a second converter used to control power to be supplied to the first converter, a frequency setting unit configured to set a driving frequency of the first converter according to at least one of a size of the recording material and a temperature at a sheet non-passing portion of the rotational member, and a power control unit controlling the second converter according to a temperature at a sheet passing portion of the rotational member to control the power to be supplied to the first converter from the second converter, wherein the conductive layer is caused to generate heat by electromagnetic induction. | 01-28-2016 |
20160026130 | FIXING APPARATUS - A fixing apparatus includes a tubular rotation member including a conductive layer, a helical coil, a resonance circuit, including a resonance capacitor, formed with the rotation member and the coil, a resonance inverter configured to control the resonance circuit, and a control unit configured to control electric power supplied to the resonance inverter, wherein the conductive layer generates heat with electromagnetic induction caused by magnetic flux generated through the coil, wherein the control unit sets a driving frequency of the resonance inverter according to at least one of a size of the recording medium and a temperature of a non-sheet-passing portion of the rotation member, and wherein the control unit changes a resonance frequency of the resonance circuit according to the set driving frequency. | 01-28-2016 |
20160077472 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming unit, a fixing unit having a heater, a temperature detection unit, a power control unit, and a conveyance control unit that controls conveying a recording material. The conveyance control unit executes, when the maximum power is greater than a threshold power, a first mode where conveyance is performed according to a time, and executes, in a case where the maximum power is less than the threshold power, a second mode where conveyance is performed according to the detected temperature. The power control unit sets a larger value to the threshold power when an option device is connected to the image forming apparatus as compared to when the option device is not connected to the image forming apparatus. | 03-17-2016 |