Patent application number | Description | Published |
20110293308 | Fixing Device Having Heat Roller Reinforced By Coil - A fixing device includes a heat roller and an opposing component. The heat roller extends in an axial direction and includes a cylindrical-shaped roller section and a coil. The heat roller section has an inner circumferential surface and an outer circumferential surface. The coil is spirally wound along the inner circumferential surface and including a first portion and a second portion other than the first portion, the first portion being configured of such a number of turns of the coil, the number being a natural number greater than zero, the first portion having a first coil pitch length in the axial direction, and the second portion being configured of at least one turn of the coil and having a second coil pitch length in the axial direction greater than the first coil pitch length. The opposing component confronts the outer circumferential surface of the roller section and is exclusively superposed with an entire first portion via the roller section. | 12-01-2011 |
20130071158 | Fixing Device - A fixing device which may include a flexible cylindrical member which has an inner peripheral surface and is configured to rotate about an axis, a heater arranged inside the cylindrical member and extends in the axial direction of the cylindrical member, and a nip member. The nip member may include a contact surface configured to contact the flexible cylindrical member, and has a predetermined length in the sheet conveying direction. Further, the nip member may have an axial length which includes a predetermined range, wherein the predetermined range along the axial length represents a maximum width of a recording sheet upon which the developer image is fixed. The fixing device may also include a guide member. The guide member and the nip member may be at least partially separated along the predetermined range of the nip member within the length of the contact surface in the sheet conveying direction. | 03-21-2013 |
20130136511 | FUSER UNIT - A fuser unit includes: a cylindrical member; a heat generation member; a nip plate; a backup member that forms a nip portion; a temperature detection member that detects a temperature of the nip plate, wherein the nip plate has: a plate-shaped part that forms the nip portion; a lubricant restraint part that is formed on at least a part of a downstream side end of the plate-shaped part in a predetermined direction and that extends toward an inner side in a diametrical direction of the cylindrical member, and a detected part that extends from an end of the lubricant restraint part toward the predetermined direction, and wherein the detected part is formed to be shorter than the plate-shaped part in an axial direction of the cylindrical member, and both ends of the detected part in the axial direction are adjacent to a space. | 05-30-2013 |
20130136513 | Fuser Unit - A fuser unit, which heat-fixes a developer image transferred on a recording sheet while moving the recording sheet in a predetermined direction, the fuser unit comprising: a cylindrical member having flexibility; a heat generation member that is arranged at an inside of the cylindrical member and generates radiation heat; a nip member that slidingly contacts an inner periphery of the cylindrical member; a reflection plate that contacts the nip member, is configured to cover the heat generation member and reflects the radiation heat toward the nip member, and a backup member that forms a nip region by nipping the cylindrical member between the nip member and the backup member, wherein the nip member and the reflection plate intermittently contact each other in an axial direction of the cylindrical member within an image forming width. | 05-30-2013 |
20130202323 | Image Forming Apparatus - An image forming apparatus includes: a fixing device having a heating member, a heat source, a rotating member, and a temperature sensor; and a control device configured to control the heat source, wherein, in a case of a low temperature state where the temperature of the heating member is lower than a predetermined temperature, the control device to control the heat source such that the temperature of the heating member rises with a gradient equal to or greater than a predetermined value, and wherein, in a case of a high temperature state where the temperature of the heating member at the print-instruction receiving time is equal to or higher than the predetermined temperature, the control device to control the heat source such that the temperature of the heating member rises with a gradient smaller than that in the normal mode. | 08-08-2013 |
20130202324 | Image Forming Apparatus - An image forming apparatus includes: a fixing device: having a heating member, a rotating member, and a temperature sensor; a sheet feeding unit; and a control device configured to perform a sheet feed control: in which the feeding timing is set to a first timing if the temperature gradient of the heating member for a predetermined period is larger than a first threshold value; and in which the feeding timing is set to a second timing later than the first timing if the temperature gradient of the heating member for the predetermined period is equal to or less than the first threshold value, and wherein, in the sheet feed control, the control device changes the first threshold value to a smaller value as the temperature of the heating member at the print-instruction receiving time increase. | 08-08-2013 |
20130202325 | Image Forming Apparatus - An image forming apparatus includes: a fixing device having a heat source, a heating member, and a backup member; a temperature detecting member; a driving source configured to rotate at least one of the heating member and the backup member; a transmitting mechanism configured to transmit a driving force of the driving source; and a control device configured to control the heat source and the driving source, wherein, after a power is turned on, the control device turns on the heat source before the driving source is driven for the first time, and wherein, when at least one of a condition, where the temperature detected by the temperature detecting member becomes a first temperature, and a condition where a predetermined period elapses after the power is turned on, is satisfied, the control device turns off the heat source and then drives the driving source. | 08-08-2013 |
20150198918 | IMAGE-FORMING APPARATUS FOR CONTROLLING SPEED OF FAN BASED ON DETECTED TEMPERATURE - In an image-forming apparatus an image-forming portion performs a printing operation in which an image is formed on a sheet. A heater thermally fixes the image on the sheet. A processor is configured to: determine whether a temperature detected by a detector is higher than a threshold value before the image-forming portion perform the printing operation; drive a fan at a first speed following start of the printing operation when the temperature is higher than the threshold value; and drive the fan at a second speed lower than the first speed for a prescribed period of time following the start of the printing operation when the temperature is lower than the threshold value or equal to the threshold, and subsequently drive the fan at the first speed; control a temperature of the heater based on the temperature detected by the detector while the image-forming portion performs the printing operation. | 07-16-2015 |