Patent application number | Description | Published |
20090033030 | SHEET CONVEYING APPARATUS AND IMAGE FORMING APPARATUS - A first detecting unit S | 02-05-2009 |
20090091075 | SHEET CONVEYANCE APPARATUS AND IMAGE FORMING APPARATUS - A skew roller is disposed near an abutment reference member. A pre-skew roller is disposed on the upstream side of the skew roller at a position corresponding to a conveyance center line. When a sheet conveyed by a pre-registration conveyance roller reaches the skew roller, the pre-registration conveyance roller moves upward to release a nipping force applied on the sheet. At the same time, the pre-skew roller moves downward to start aligning the sheet. | 04-09-2009 |
20100102504 | SHEET CONVEYANCE APPARATUS AND IMAGE FORMING APPARATUS - A skew roller is disposed near an abutment reference member. A pre-skew roller is disposed on the upstream side of the skew roller at a position corresponding to a conveyance center line. When a sheet conveyed by a pre-registration conveyance roller reaches the skew roller, the pre-registration conveyance roller moves upward to release a nipping force applied on the sheet. At the same time, the pre-skew roller moves downward to start aligning the sheet. | 04-29-2010 |
20100158568 | BELT MEMBER FEEDING DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH THE SAME - An image forming apparatus includes a rotatable belt member; stretching means for stretching the belt member; steering means for stretching and steering the belt member, wherein the steering means includes a rotatable portion rotatable with rotation of the belt member, a frictional portion, provided at each of opposite axial end of the rotation portion, for slidable contact with the belt member, supporting means for supporting the rotatable portion and the frictional portion, a rotation shaft rotatably supporting the supporting means, and the steering means is capable of steering the belt member by rotation thereof by forces resulting from sliding between the belt member and the frictional portion, wherein each of the frictional portions is provided with an inclined surface which is inclined to be further from a rotational axis of the rotation portion axially toward an outside, and wherein the belt member is contacted to at least one of the inclined portions. | 06-24-2010 |
20100158585 | BELT MEMBER FEEDING DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH THE SAME - A belt feeding apparatus includes a rotatable belt member; first and second stretching members for stretching the belt member; and steering means for steering the belt member, the steering means supports the belt member at a position adjacent to the first stretching member and to the second stretching member with respect to a rotational direction of the belt member, wherein the steering means includes rotatable portion rotatable with rotation of the belt member, a frictional portion, provided at each of opposite axial end of the rotation portion, for slidable contact with the belt member, supporting means for supporting the rotatable portion and the frictional portion, and a rotation shaft rotatably supporting the supporting means, wherein the steering means moves the belt member in the rotational axis direction by the supporting means rotating by a force produced by sliding between the belt member and the frictional portion; wherein the frictional portion is disposed substantially at a position where a plane parallel with a plane perpendicular to the rotational axis and a circumference of an ellipse formed when a sum of a distance between the first stretching member and the frictional portion and a distance between the second stretching member and the frictional portion, and wherein a steering force applied to the frictional portion is larger than a resisting force produced upon production of a steering amount per unit length, at a side toward which belt member is deviated when the belt member deviates in the rotational axis direction by the unit length. | 06-24-2010 |
20100207322 | SHEET CONVEYING APPARATUS EXECUTING ORIENTATION CORRECTION - In a sheet conveying apparatus a first shape information that expresses at least a part of the outer shape of a sheet. An obtaining unit obtains second shape information that expresses at least the part of the outer shape of the sheet. A correction amount computing unit computes a correction amount of the sheet for correcting an image to be formed on the sheet and/or correcting the position and/or orientation of the sheet based on the first shape information and the second shape information. A correction amount computing unit computes a correction amount for correcting the position and/or orientation of the sheet relative to the conveying direction from the computed skew amount. A position and/or orientation correction unit corrects an image to be formed on the sheet and/or the position and/or orientation of the sheet, according to the computed correction amount. | 08-19-2010 |
20100283199 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREFOR - An image forming apparatus that is capable of reducing a jam and correcting misalignment of a sheet due to a buckling of the sheet certainly. A skew correction unit conveys a sheet while contacting one of side edges of the sheet with a reference member that is arranged in parallel to a conveyance direction in order to correct a skew of the sheet conveyed along a conveyance path. A misalignment correction unit moves the sheet that the skew has been corrected in a width direction perpendicular to the conveyance direction. A sheet position detection unit detects a position of the other of the side edges of the sheet that the skew has been corrected. A moving amount determination unit determines a moving amount by which the misalignment correction unit moves the sheet in the width direction. | 11-11-2010 |
20100310285 | IMAGE FORMING APPARATUS - In an image forming apparatus using an intermediate transfer tandem method, image forming unit is divided into two parts and toner images superimposed on an intermediate transfer belt included in one of the image forming unit is once secondary transferred onto toner images superimposed on an intermediate transfer belt included in the other image forming unit. Then the secondary transferred images are collectively transferred (tertiary transferred) onto a recording material at once. | 12-09-2010 |
20100310286 | BELT MEMBER DRIVING APPARATUS AND IMAGE FORMING APPARATUS HAVING BELT MEMBER DRIVING APPARATUS - A belt driving apparatus for rotationally driving a belt member, the belt member driving apparatus includes a stretching member for stretching the belt member; steering means including a steering member having a rotatable portion which is rotatable with rotation of the belt member, a frictional portion slidable relative to the belt member and provided at each of longitudinally outsides of the rotatable portion, and further including supporting means supporting the steering member, and a rotation shaft rotatably supporting the supporting means, the steering means being effective to steer the belt member by inclining the steering member by a force produced by sliding between the frictional portion and the belt member; and resisting force applying means for applying a resisting force against inclination of the steering member, the resisting force increases with increase of rate of change of an inclination angle of the steering member with respect to time. | 12-09-2010 |
20100322653 | IMAGE FORMING APPARATUS WITH ERROR CORRECTION FOR LENGTH OF TRANSFER SHEET - An image forming apparatus is configured so that a first detection position and a second detection position are set along the direction of conveying a transfer material between adjacent conveyance rollers. The image forming apparatus has four sensors, two of which are disposed in the first detection position at a predetermined interval, and the remaining two of which are disposed in a second detection position at a predetermined interval. An actual length of the transfer material can be detected with high accuracy by performing (1) cancellation of an error in detection caused by variation in a speed at which the transfer material is conveyed, (2) cancellation of an error in detection caused by a skew, and (3) cancellation of an error in detection caused by oblique passing. | 12-23-2010 |
20110013963 | DOOR OPENING OR CLOSING DETECTING APPARATUS AND IMAGE FORMING APPARATUS - A door opening or closing detecting device and an image forming apparatus including a shaft member which is provided to a housing slidably along one end of a door, and urged to be brought into pressure contact with a pressing member through a pressure contact member, the shaft member being slid by the pressing member which moves with opening/closing of the door. The opening/closing of the door is detected by a detecting portion according to sliding of the shaft member, and a power supply is interrupted by a switch portion. The door opening or closing detecting apparatus and the image forming apparatus are capable of reliably detecting the opening/closing of the door and appropriately interrupting the power supply while achieving space saving and reduction in size of the apparatus. | 01-20-2011 |
20110026964 | IMAGE FORMING APPARATUS - An image forming apparatus includes a first image bearing drum; a first developing device; a second image bearing drum; a second developing device; an intermediary transfer member for carrying the image transferred from the first drum and the toner image transferred from the second drum; a cleaning device for collecting toner deposited on the intermediary transfer member; heating means for heating at least a sheet; an executing portion capable executing an operation in a first mode for forming the image on the intermediary transfer member from the first and second drums and an operation in a second mode for forming an image on an intermediary transfer member from the second drum without transfer of the toner image from the first drum onto the intermediary transfer member; a temperature detecting portion disposed in the apparatus; a fan for feeding air in the apparatus; control means for controlling the fan on the basis of an output of the temperature detecting portion so that an air feed amount increases with increase of the temperature; a setting portion for setting a temperature so that the temperature at which the air feed amount is increased in the second mode is lower than the temperature at which the air feed amount is increased in the first mode. | 02-03-2011 |
20110318048 | BELT DRIVING APPARATUS AND IMAGE FORMING APPARATUS - A belt driving apparatus includes a rotatable belt member; a stretching member for stretching the belt member; a steering device for stretching and steering the belt member, wherein the steering device includes a rotatable portion which is rotatable with rotation of the belt member, a frictional portion provided at each of longitudinal outsides of the rotatable portion with respect to a widthwise direction and slidable relative to the belt member by being prevented from rotating, supporting member for supporting the rotatable portion and the frictional portion, and a rotation shaft for rotatably supporting the supporting member, and wherein the steering device is capable of moving the belt member in the widthwise direction by rotating the supporting member by a force produced by sliding between the belt member and the frictional portion; and an urging member, provided at each of longitudinal end portion sides of the rotatable portion with respect to the widthwise direction, for urging the belt member against the frictional portion in contact with an outer peripheral surface of the belt member. | 12-29-2011 |
20120114351 | IMAGE FORMING APPARATUS - An image forming apparatus includes an intermediate transfer belt unit and a transfer belt unit each of which has a deviation control mechanism and which are held in contact with each other at a transfer portion, wherein at least a steering roller on which a secondary transfer belt is suspended is situated such that a traction surface thereof does not constitute a transfer surface including a transfer roller. | 05-10-2012 |
20130108333 | BELT MEMBER FEEDING DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH THE SAME | 05-02-2013 |
20130223860 | IMAGE FORMING APPARATUS - An image forming apparatus includes first and second image bearing drums; first and second developing devices for forming a toner image on the drums; an intermediary transfer member for carrying images transferred front the drums and secondary transferring the toner image onto a recording material; a heater for heating the recording material; an executing portion for executing a first mode for forming a toner image on the intermediary transfer member from both drums and a second mode for forming a toner image on the intermediary transfer member only from the second drum; a temperature detecting portion; a fan; a controller for controlling the fan based on a detected temperature; a setting portion for setting a temperature at which an air feed amount of the fan is increased in the second mode is lower than a temperature at which the all feed amount is increased in the first mode. | 08-29-2013 |
20140183008 | BELT FEEDING DEVICE FOR IMAGE FORMING APPARATUS - A belt feeding device for an image forming apparatus includes a roller unit for supporting an endless belt, the roller unit including a driven rotatable member, and a pair of shaft supporting members for supporting opposite end portions of the rotatable member with respect to a widthwise direction crossing with a feeding direction of the endless belt, the shaft supporting members being provided with respective sliding surfaces for applying frictional forces by sliding relative to an inner surface of the endless belt; a stretching roller cooperative with the roller unit to support the endless belt; and a supporting mechanism for inclinably supporting the roller unit so as to incline a rotational axis of the rotatable member relative to a rotational axis of the stretching roller by the frictional force. | 07-03-2014 |
20140255061 | DEVELOPING DEVICE - A developing device includes: a developer carrying member (sleeve); a regulating portion including an edge portion at a closest position to a surface of the sleeve or a flat portion tilted, at the closest position, by an angle of 2 degrees or less relative to a contact flat plane contacting the surface of the sleeve; and a rectifying portion connected with the edge or flat portion. The rectifying portion has a concavely curved surface such that a rate of a decrease in gap between the rectifying portion and the contact flat plane increases toward a downstream side of the developer feeding direction and is formed by smoothly connecting rectilinear or curved lines each of 0.2 mm or less except for the edge portion so that the gap between the rectifying portion and the contact flat plane is monotonically decreases toward the downstream side of the developer feeding direction. | 09-11-2014 |
20150043948 | LAYER THICKNESS REGULATING MEMBER, DEVELOPING DEVICE AND PROCESS CARTRIDGE - A layer thickness regulating member includes: an opposing portion opposing a peripheral surface of a developer carrying member; a layer thickness regulating portion, projecting from the opposing portion toward the developer carrying member, for regulating a layer thickness of a developer carried on the developer carrying member; and a rib portion provided in a side, of the opposing portion, opposite from the layer thickness regulating portion. The opposing portion, the layer thickness regulating portion and the rib portion are integrally molded. The rib portion is disposed at a non-overlapping position with a region, at least in an image forming region, corresponding to a region where the layer thickness regulating portion is formed at the opposing portion. | 02-12-2015 |
20150043950 | DEVELOPING DEVICE AND LAYER THICKNESS REGULATING MEMBER - A developing device includes: a developer carrying member and a layer thickness regulating member. The layer thickness regulating member includes: an opposing portion, a regulating portion, side wall portions, and a plurality of rib portions each extending from the side wall portion in one end side to the side wall portion in the other end side with respect to the rotational axis direction of the developer carrying member. A space is formed by being defined by the side wall portions and the rib portions. Substantial no rib portion dividing the space with respect to a longitudinal direction of said layer thickness regulating member is provided. | 02-12-2015 |
20150063867 | IMAGE CARRIER UNIT AND IMAGE FORMING APPARATUS - An image carrier unit includes an engage mechanism configured to attach a protection cover slidably to a unit casing in a rotational axis direction of an image carrier. The engage mechanism includes first and second engage mechanisms. The first engage mechanism includes a first engage portion provided at a first end portion in a width direction orthogonal to the rotational axis direction of the protection cover and a first engaged portion provided in the unit casing and engaged with the first engage portion, and is configured such that the first engage portion engages with the first engaged portion in orientation to one side in the width direction. The second engage mechanism is also configured such that a second engage portion engages with a second engaged portion in orientation to the one side in the width direction. | 03-05-2015 |