Patent application number | Description | Published |
20110033212 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member for carrying a toner image; a transfer member forming a nip with the image bearing member to transfer the toner image from the image bearing member onto a transfer material at the nip, wherein the image forming apparatus is operable in a marginless printing mode in which the toner image formed on the image bearing member is larger than a size of the transfer material, and the toner image is transferred as far as edges of the transfer material; and a charging member for effecting electric discharge toward the image bearing member, the charging member being disposed at such a position as is opposed to a side of the transfer material which receives the toner image in an upstream side of the nip with respect to a feeding direction of the transfer material, wherein when the apparatus operates in the marginless printing mode, the charging member effects the electric discharge toward the toner existing in an area of the image bearing member which corresponds to an area which is outside beyond the edge of the transfer material at the nip to electrically charge the toner in the outside area to a polarity opposite a regular polarity. | 02-10-2011 |
20110150532 | IMAGE FORMING APPARATUS - A charging member that charges residual toner on an intermediate transfer belt is a charging brush constituted by conductive fibers including an electric insulating portion and an electric conductive portion. Part of the outer circumferential surface of each conductive fiber is the conductive portion. | 06-23-2011 |
20110243617 | IMAGE FORMING APPARATUS FOR TRANSFERRING TRANSFER RESIDUAL TONER ONTO IMAGE BEARING MEMBER - There is a charge member which charges secondary transfer remaining toner on an intermediate transfer member to a polarity opposite to a normal charge polarity. The transfer remaining toner charged by the charge member is moved in the direction opposite to that of normal toner by a transfer bias and moved from the intermediate transfer member onto an image bearing member. A BK station is arranged on the downstream of other stations. In a continuous BK monochromatic mode, by applying a reverse bias to transfer portions of the other stations and applying the transfer bias only to the BK station, waste toner can be collected into the BK station (simultaneously with the transfer). In a full-color mode, since each transfer bias is applied to all stations, the waste toner is collected into the station on the uppermost stream. Thus, the image bearing member for collecting the transfer remaining toner on the intermediate transfer member is made different according to the mode, thereby suppressing that the collection of the waste toner is concentrated on one image bearing member. | 10-06-2011 |
20120128392 | IMAGE FORMING APPARATUS FOR TRANSFERRING TRANSFER RESIDUAL TONER ONTO IMAGE BEARING MEMBER - A charge member charges secondary transfer remaining toner on an intermediate transfer member to a polarity opposite to a normal charge polarity. The remaining toner is moved by a transfer bias, from the intermediate transfer member onto an image bearing member. A BK station is arranged on the downstream of other stations. In a continuous BK monochromatic mode, by applying a reverse bias to transfer portions of the other stations and applying the transfer bias only to the BK station, remaining toner can be collected into the BK station (simultaneously with the transfer). In a full-color mode, remaining toner is collected into the station on the uppermost stream. Thus, the image bearing member for collecting remaining toner on the intermediate transfer member differs according to the mode, thereby suppressing the collection of remaining toner being concentrated on one image bearing member. | 05-24-2012 |
20130089347 | IMAGE FORMING APPARATUS - An image forming apparatus comprising: a first image bearing member (drum); a second drum; a belt; a first transfer unit; a second transfer unit; a first voltage applying unit; a second voltage applying unit; a detecting unit, connected to the first transfer unit, for detecting a value of a current passing through the first voltage applying unit; and a controller for controlling the first voltage applying unit and the second voltage applying unit. The controller controls the first voltage applying unit during image formation on the basis of a detection result of the value of the current detected by the detecting unit at timing before and after the voltage applied to the second voltage applying unit is changed plural times before the image formation. | 04-11-2013 |
20130136509 | IMAGE FORMING APPARATUS - In an image forming apparatus, one of a plurality of support members supporting an intermediate transfer belt is a guide member configured to regulate the rotational direction of the intermediate transfer belt while being held in sliding contact with the intermediate transfer belt at a position opposite the secondary transfer member across the intermediate transfer belt. This guide member is equipped with a first resistor portion in sliding contact with the intermediate transfer belt and a second resistor portion of a higher electrical resistance than the first resistor portion, with the second resistor portion provided upstream of the first resistor portion in the rotational direction of the intermediate transfer belt. | 05-30-2013 |
20130164049 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member unit including a toner image carrying member; a transfer unit including a movable endless belt for transferring the toner image from the carrying member onto a transfer material, a plurality of stretching members for stretching the endless belt, and a supporting portion, provided at a end portion with respect to a widthwise direction, for supporting the stretching members; and a main assembly frame provided at a position opposing the supporting portion and including a positioning portion for determining a positions of the plurality of stretching members, wherein the supporting portion is movable relative to the main assembly frame. | 06-27-2013 |
20130272730 | IMAGE FORMING APPARATUS - The image forming apparatus, while an image forming mode is executed, during a period from start of the image forming mode until a toner image to be transferred onto a recording material is primarily transferred onto an intermediate transfer member from one of the plurality of image bearing members, which is positioned on the uppermost stream in a rotation direction of the intermediate transfer member, a toner patch (T) is formed on at least one image bearing member and the toner patch (T) is provided to a primary transfer portion. Thus, without using waste toner as a lubricant, fluctuations in circumferential surface speed, which are generated in the intermediate transfer member during the image forming operation, may be reduced. | 10-17-2013 |
20150063885 | FILM AND IMAGE HEATING DEVICE USING FILM - A cylindrical film used in an image heating device heating a recording material, on which an image has been formed, has a resin layer, this resin layer being made from a resin in which a crystalline resin and an amorphous resin having a higher glass transition temperature than the crystalline resin are blended, wherein a volume ratio of the crystalline resin with respect to the amorphous resin in the resin layer is 70/30 to 99/1. | 03-05-2015 |