| Patent application number | Description | Published |
|---|
| 20090208238 | IMAGE FORMING DEVICE AND METHOD - An image forming device that uses only one temperature sensor to detect temperatures of the recording sheet and a rotation member for fixing, and can perform the temperature adjustment control carefully in detail during the image forming operation. The CPU 61 performs the temperature adjustment control 1 by executing the temperature adjustment program 64 | 08-20-2009 |
| 20100232826 | COOLING APPARATUS AND IMAGE FORMATION APPARATUS - In an image formation state, to cool a recording sheet on a route from a fixer to a paper ejection roller, a blast fan assumes a first position restrained by a first fixture. Also, in another state, to cool a recording sheet on the catch tray, the blast fan assumes a second position restrained by a second fixture. To transition from the image formation state to another state, the blast fan sends a strong blast in a reverse direction from the normal blast direction. A bias is generated on the blast fan due to the resulting reactive force, the blast fan becomes free from the restraint of the first fixture, and shifts from the first position to the second position. Conversely, to transition from another state to the image formation state, a strong blast is sent in the same direction as the normal blast direction, and the blast fan shifts from the second position to the first position. | 09-16-2010 |
| 20100290795 | TONER CONCENTRATION SENSOR AND TONER CONCENTRATION CONTROL METHOD - In this toner concentration sensor, as the magnetic permeability of a two-component developer | 11-18-2010 |
| 20110150530 | IMAGE FORMING APPARATUS - An image forming apparatus including, a photosensitive body for carrying toner images, a transfer section for nipping the recording sheet at a position facing the photosensitive body and transferring the toner images carried on the photosensitive body onto a recording sheet, a driving section for driving the photosensitive body, and a control section for giving instructions to the driving section to conduct a velocity control to rotate the photosensitive body at a predetermined velocity, wherein the control section sets a gain of velocity control to be greater than normal condition, at a time which is at least one of a time when the recording sheet enters the transfer section, or a time when the recording sheet separates from the transfer section. | 06-23-2011 |
| 20110222922 | FIXING APPARATUS AND IMAGE FORMING APPARATUS INCORPORATING THE SAME - Disclosed is a fixing device, which makes it possible to prevent the air blasting section from deterioration, caused by heat transferred from the duct to the air blasting section. The fixing device includes a fixing section to fix the toner image onto the paper sheet; a heat source; and a separating section to separate the paper sheet from the pair of fixing members. On the other hand, the separating section includes: a gas blasting section to blast a gas; and a duct to guide the gas towards the pair of fixing members, and that is provided with a duct wall serving as a heat receiving surface to receive radiation heat irradiated from the fixing section, and at least one of the gas blasting section and the duct is provided with such a connection structure that suppresses heat transferring action from the duct to the gas blasting section. | 09-15-2011 |
| 20110274456 | IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING IMAGE FORMING APPARATUS - An image forming apparatus includes a fixing device having a heater, a signal generator for generating a prescribed cyclic signal in conformity with a waveform of an AC power supply applied to the heater, and a controller for controlling power feed to the heater. The controller determines whether a cycle of the prescribed cyclic signal becomes shorter than a prescribed period or not. When the controller has determined that the cycle has become shorter than the prescribed period, the controller controls power feed to the heater under phase control and when the controller has determined that the cycle has not become shorter than the prescribed period, the controller controls power feed to the heater under zero crossing control. | 11-10-2011 |
| 20110280603 | FIXING DEVICE AND IMAGE FORMING APPARATUS - In order that the air surrounding a fixing member is prevented from entering a blowing section for blowing separation air, a wind speed setting section is provided with switchable control modes, namely, a first control mode (control mode for operating the blower fan at a wind speed for separation) and a second control mode (control mode for operating the blower fan at a low speed). This structure allows the blower fan to be controlled in conformity to any one of these first and second control modes. | 11-17-2011 |
| 20110305492 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes: a fixing section which passes a sheet through a fixing nip portion formed by a pair of fixing members and thereby fixes a toner image on the sheet by heating; a blowing section which separates the sheet from the fixing members by blowing separation wind from a sheet discharge side of the fixing nip portion to the fixing members; an opening setting section which is provided with an opening region in which an opening width in a sheet width direction is adjustable, and adjusts a blowing range in the sheet width direction of the separation wind blown through the opening range from the blowing section to the fixing members; a temperature detection sensor for detecting temperature of the fixing members; and a control section which controls the opening width of the opening setting section based on the temperature detected of the fixing members. | 12-15-2011 |
