Patent application number | Description | Published |
20090092403 | IMAGE FORMING APPARATUS - In an image forming apparatus having a toner density sensor which emits light to a developer carried on a developing sleeve and which detects developer density by a reflection output value from the developer, when a reflection output value when the developer is initially set with respect to the illumination light of the toner density sensor is defined as A and a reflection output value of a region of at least the developing sleeve which is opposed to the toner density sensor when the developer is not carried on the developing sleeve is defined as B, a value of B/A is in a range of 0.3 | 04-09-2009 |
20100158554 | COLOR IMAGE FORMING APPARATUS - An image forming method includes forming toner images on first and second image bearing members; transferring a first toner image on the first image bearing member and a second toner image on the second image bearing member, in mutually superposed manner, onto a recording material; heating the first and second toner image thereby fixing the same to the recording material; detecting alignment marks on the first and second image bearing members in the course of a continuous job for continuously forming images; controlling relative positions of the first toner image and the second toner image, based on a result of detection of the alignment marks; and increasing a frequency of execution of the relative position control in the continuous job, as the recording material to be subjected to image formation in the continuous job has a smaller width in a direction perpendicular to a transport direction of the recording material. | 06-24-2010 |
20110262161 | IMAGE FORMING APPARATUS - An image forming apparatus includes a developing container for containing a developer including toner and a carrier; a feeding member for feeding the developer contained in the developing container; a drive control portion, capable of selectively executing at least operations in a first mode in which the developer is fed at a first feeding speed by the feeding member to form an image and a second mode in which the developer is fed at a second feeding speed, different from the first feeding speed, by the feeding member to form an image, for controlling the feeding speed of the developer by the feeding member depending on the operation in the mode to be executed; a toner content detection sensor for detecting toner content by using magnetic permeability of the developer contained in the developing container; and a voltage control portion for controlling a control voltage to be inputted into the toner content detection sensor. When the operation in the second mode is executed after the operation in the first mode is executed, the voltage control portion controls the control voltage in the second mode on the basis of a latest output value outputted by the toner content detection sensor in a preceding first mode. | 10-27-2011 |
20120106991 | IMAGE FORMING APPARATUS - An image forming apparatus includes a correcting portion for correcting an image forming condition on the basis of a result of detection of a first control toner image; a supply controller for controlling a supplying device on the basis of a result of detection of a second control toner image; an executing portion for executing an operation at least in a first image forming mode in which the image is formed at a first speed and in a second image forming mode in which the image is formed at a second speed; and a controller for controlling an image forming condition such that during the second image forming mode, the first control toner image is formed at the speed of the second image forming mode, and the second control toner image is formed after the speed is changed to a third speed which is higher than the second speed. | 05-03-2012 |
20120114348 | IMAGE FORMING APPARATUS - A control unit decreases the potential difference according to an increase in the drive amounts of the image bearing member and the developer bearing member, based on a first information about a drive amount of the image bearing member and second information about a drive amount of the developer bearing member, in a case that an integrated value of the first information and the second information from initial installation or replacement of the developing device is greater than a predetermined value. | 05-10-2012 |
20130101321 | IMAGE FORMING APPARATUS - In an apparatus which controls the bias of an intermediate transfer belt, the position shift of the width direction between a toner image and a recording material is reduced. Based on the results of estimating the variation moving in the width direction of the intermediate transfer belt, the position in the width direction of the recording material conveyed to a transfer position is changed to match the positions in the width direction of the toner image and the recording material. | 04-25-2013 |
20130164006 | IMAGE FORMING APPARATUS FOR DETECTING PATCH IMAGE INCLUDING A PLURALITY OF REGIONS - An image forming apparatus includes a plurality of developing units configured to develop latent images formed on a plurality of photosensitive members by a exposure units; an image carrier, on which the developed images formed on the plurality of photosensitive members are transferred; a sensor configured to irradiate the image carrier with light, and detect an amount of reflected light; a patch detection unit configured to detect a position of a patch image, formed on the image carrier, based on the amount of reflected light detected by the sensor, wherein the patch image has a first region and a second region formed on the same photosensitive member, the second region is formed to be adjacent to the first region, and a density of the second region is lower than that of the first region. | 06-27-2013 |
20130302053 | IMAGE FORMING APPARATUS - An image forming apparatus of a representative configuration of the present invention includes a photosensitive drum, which carries an electrostatic latent image, and a developing sleeve, which carries a two-component developer and develops the electrostatic latent image on the photosensitive drum into a toner image. Moving directions of the photosensitive drum and the developing sleeve are opposite at an opposing portion in a developing device having a speed changing portion, which changes the driving speed of the developing sleeve, and a controller, which switches a target speed of the developing sleeve so that it is driven at a second velocity, before it is driven at the first velocity set in a lower speed mode, when the lower speed mode is executed in which the photosensitive drum is driven at a lower speed than in the normal image forming. | 11-14-2013 |