Patent application number | Description | Published |
20110293300 | IMAGE FORMING APPARATUS - An image forming apparatus including an image bearing member; a developing device for developing with toner an electrostatic latent image formed on the image bearing member; a humidity sensor for providing information on ambient humidity of said image forming apparatus; and a controller for controlling a parameter on a density of an image to be formed on a recording material on the basis of pieces of the information provided by the humidity sensor at different times. The controller is capable of controlling the parameter so that, when a first image forming job is ended at an ending time and then a second image forming job is executed after a lapse of a predetermined time from the ending time and in a period in which a detection result of the humidity sensor changes and then is constant, a difference between a first set value which is the parameter set during formation of a final image in a first image forming job and a second set value which is the parameter set during image formation on a first sheet in the second image forming job after the lapse of the predetermined time from the ending time, increases with an increase of proportion of a time in which the developing device is driven during the lapse of the predetermined time. | 12-01-2011 |
20120134690 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member for carrying an electrostatic latent image; a developing device, containing a developer including a toner and a carrier, for developing the electrostatic latent image carried on the image bearing member into a toner image with the developer; a supplying device for supplying the toner to the developing device; a first detecting portion for detecting information on a temperature of the developing device; a second detecting portion for detecting information on a temperature of the supplying device; and a correcting portion for correcting, when detection results of the first and second detecting portions are different from each other, an image forming condition with increase of a supply amount of the supplying device. | 05-31-2012 |
20120207496 | IMAGE FORMING APPARATUS - A representative configuration of an image forming apparatus according to the invention is provided. The image forming apparatus has a plurality of developing devices which develops an electrostatic latent image formed on a photosensitive drum into a toner image using developer of plural colors. The image forming apparatus includes a density sensor which detects the amount of toner of the toner image for each color. In a case where it is determined that the amount of toner of any color departs from a predetermined range based on the detection result of the density sensor, a development condition of the rest developing devices other than the developing device departing from the predetermined range is changed such that the image densities developed by the respective developing devices are equal to each other. | 08-16-2012 |
20130136469 | IMAGE FORMING APPARATUS - An image forming apparatus includes photoconductor drums, a plurality of development apparatuses, temperature-humidity sensors that detects at least temperatures or humidity of the development apparatuses, image density adjusting units that adjusts an image density of the toner image, and a control unit that adjusts the image density of the toner image by the image density adjusting units based on detection results of the temperature-humidity sensors. The control unit controls the adjusting unit based on information about color differences of detection values of the temperature-humidity sensors so that the adjusting unit adjusts an image density of the toner image or not. | 05-30-2013 |
20130183049 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member, a development device, a supply developer container, a supply developer supply member, a toner density detecting portion, and a controller. The controller that controls an image formation condition based on first information regarding a humidity of the developer accommodated in the developing device, second information regarding a humidity of the developer accommodated in the supply device and third information regarding a supply amount supplied by the supply device. | 07-18-2013 |
20130251387 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member; a developing device, including a developer carrying member for carrying a developer, for developing a latent image formed on the image bearing member; a humidity sensor for detecting a humidity of the developer in contact with the developer in the developing device; and a controller for controlling an image forming condition on the basis of a detection result of the humidity sensor. The controller is capable of executing an operation in a mode, for correcting the image forming condition, on the basis of a history of information on the humidity detected by the humidity sensor when a drive time of the developing device from start of image formation is less than a predetermined time. | 09-26-2013 |
20130287414 | IMAGE FORMING APPARATUS - The present invention provides an image forming apparatus, including: an image bearing member; a development device that develops an electrostatic latent image formed in the image bearing member with a toner; a detection portion that detects information on humidity within the apparatus body; a time measuring portion that acquires a time information; a humidity sensor that detects humidity around the development device; and a controller that sets a parameter about an image density formed in a transfer material, based on history information about the information on humidity within the apparatus body and the time information detecting the information on humidity and based on information acquired by the acquisition portion. | 10-31-2013 |
20140119754 | IMAGE FORMING APPARATUS - An image forming apparatus including an image bearing member; a developing device for developing with toner an electrostatic latent image formed on the image bearing member; a humidity sensor for providing information on ambient humidity of said image forming apparatus; and a controller for controlling a parameter on a density of an image to be formed on a recording material on the basis of pieces of the information provided by the humidity sensor at different times. The controller is capable of controlling the parameter so that, when a first image forming job is ended at an ending time and then a second image forming job is executed after a lapse of a predetermined time from the ending time and in a period in which a detection result of the humidity sensor changes and then is constant, a difference between a first set value which is the parameter set during formation of a final image in a first image forming job and a second set value which is the parameter set during image formation on a first sheet in the second image forming job after the lapse of the predetermined time from the ending time, increases with an increase of proportion of a time in which the developing device is driven during the lapse of the predetermined time. | 05-01-2014 |
20140199088 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member for carrying an electrostatic latent image; a developing device, containing a developer including a toner and a carrier, for developing the electrostatic latent image carried on the image bearing member into a toner image with the developer; a supplying device for supplying the toner to the developing device; a first detecting portion for detecting information on a temperature of the developing device; a second detecting portion for detecting information on a temperature of the supplying device; and a correcting portion for correcting, when detection results of the first and second detecting portions are different from each other, an image forming condition with increase of a supply amount of the supplying device. | 07-17-2014 |
20140255047 | IMAGE FORMING APPARATUS - A controller which controls a replenishing operation of the first replenishing device based on the first sensor, and controls a replenishing operation of the second replenishing device based on the second sensor; wherein the controller prohibits the replenishing operation of the first replenishing device when the developer concentration in the first replenishing device reaches a first upper limit set to the first developing device; wherein the controller prohibits the replenishing operation of the second replenishing device when the developer concentration in the second replenishing device reaches a second upper limit set to the second developing device; and wherein the controller corrects the second upper limit based on the developer concentration in the second developing device when the developer concentration in the first developing device reaches the first upper limit. | 09-11-2014 |