Patent application number | Description | Published |
20080213001 | Image printing apparatus - An image printing apparatus includes a control unit which controls a rotational speed of an image carrier; a detecting unit which detects data of the rotational speed; a storage unit which stores the rotational speeds up to n past rotation cycle of said image carrier; and a determining unit which determines whether a rotational speed difference between a latest rotational speed in a current rotation cycle and a rotational speed in n past rotation cycle before the current rotation cycle at a predetermined interval, which includes the same rotational position in respective rotation cycles and its near position, is more than a predetermined reference value, wherein said control unit controls the rotational speed of said image carrier by using the data of rotational speeds at a predetermined interval including the same rotational position in one or n past rotation cycle before the current rotation cycle, and further said control unit controls a rotational speed in a subsequent rotation cycle next to the current rotation cycle in accordance with a determination result obtained by said determining unit. | 09-04-2008 |
20080259364 | IMAGE FORMING APPARATUS - An image forming apparatus including a plurality of image forming sections arranged in tandem for forming an image having a plurality of colors, the image forming apparatus having: an image reading section for reading an image of a document; an exposure unit having each color exposure section for conducting each color exposure for writing the image, a process unit having a plurality of image forming sections for forming a toner image based on the image read by the image reading section; and a casing for accommodating the image reading section, the exposure unit and the process unit, wherein the exposure unit and the process unit are integrated as an image forming unit and the image forming unit is structured so that it can be drawn from the casing. | 10-23-2008 |
20090123182 | IMAGE FORMING APPARATUS - An image forming apparatus including photoconductor drums corresponding to colors, motors, gears to transmit each rotation of the motors to each of the photoconductor drums, each of two gears comprising a portion to be detected intermittently continuing in a circumferential direction at a position having same radius centering around a rotary shaft of the gears, a pair of phase sensors to output detection signals of signal logics according to an existence or a non-existence of the portion to be detected at a point symmetric position centering around the rotary shaft of each of two gears and a control unit to calculate a rotation phase difference between each of the gears based on a logical combination of the detection signals which are output from the pair of phase sensors and to control the motors so as to synchronize rotation of each of the gears based on the calculated rotation phase difference. | 05-14-2009 |
20090269089 | COLOR IMAGE FORMING APPARATUS USING REGISTRATION MARKS - In an image forming apparatus for forming a color image by superposing component color images, a control device obtains position data representing a forming position of each of plural registration mark images for the component color images with respect to a positional reference value arbitrarily determined, divides the position data into each of a unit reference range representing a range in which one mark image is formed, converts the position data divided for each unit reference range into those based on respective reference values representing the front edge of the unit reference ranges, extracts the position data representing ranges common to the mutually overlapping ranges each of which is represented by a couple of position data corresponding to the rising and falling edges of a passage timing pulse as read position data of the mark image of the component color, and calculates the amounts of positional deviations of the component color images from one another on the basis of the position data extracted. | 10-29-2009 |
20110064442 | FIXING DEVICE AND IMAGE FORMING APPARATUS USING THE SAME - To enhance the fixing quality of a fixing device to continuously fix sheets of a plurality of sizes, a carbon nanotube sheet | 03-17-2011 |
20120195606 | IMAGE FORMING APPARATUS - Damages on fixing members caused by paper passing through can be reduced. The registration rollers | 08-02-2012 |
20130201500 | IMAGE FORMING APPARATUS - An image forming apparatus which allows a user to freely select a desired image quality is provided. The control unit | 08-08-2013 |
20130302058 | Image Forming Apparatus Provided With Fixing Unit for Fixing Images Formed on Paper and Method of Controlling Heaters of the Apparatus - An image forming apparatus includes a plurality of heaters | 11-14-2013 |
20140212185 | IMAGE FORMING APPARATUS - An image forming apparatus forms decision registration mark for deciding whether or not a color registration correction for correcting color shifts in the color image carries out on an intermediate transfer belt. The decision registration mark is formed by registering four color registration marks. Color registration sensors detect a detection width of the decision registration mark along a sub scanning direction. A control portion receives the detection width of the decision registration mark and decides whether or not the color registration correction carries out based on whether or not the detection width of the decision mark detected by the detection portion exceeds the period of reference time. When the detection width of the decision mark detected by the detection portion exceeds the period of reference time, the control portion carries out the color registration correction. | 07-31-2014 |
Patent application number | Description | Published |
20080253786 | Image forming apparatus - In an image forming apparatus having a process correction mode wherein when a temperature of a fixing device in an image formation system in a power-on state is equal to or less than a predetermined value, the image forming apparatus makes the fixing temperature to increase to the predetermined value. The apparatus sets the process correction mode based on power-on information output from a first detector which detects presence of the power-on state for the fixing device and fixing temperature information output from a second detector which detects a fixing temperature in the fixing device, and sets a priority level for performing the correction processing of the color misregistration to be lower than the correction processing of the process other than the correction processing of color the misregistration. | 10-16-2008 |
20090257778 | IMAGE FORMING APPARATUS - An image forming apparatus having a color mode and a monochromatic mode, which includes: a transmission member, which can be switched between a transmitted state where a motor transfers a drive force to a single photoreceptor drum and a non-transmitted state where the motor does not transfer the drive force to the single photoreceptor drum; and a controller which switches to the non-transmitted state while executing an image formation in the monochromatic mode, and when a command to execute a next image formation is not instructed, switches to the transmitted state after a phase adjustment of each photoreceptor drum after the image formation in the monochromatic mode, and controls the motor to execute a slight rotation operation at every prescribed period of time by synchronizing plural drums including the single photoreceptor drum with each other through the transmission member. | 10-15-2009 |
20090317147 | SHEET COLOR IMAGE FORMING APPARATUS - A color image forming apparatus for forming toner images by carrying out charging, exposure, and development on at least one photoreceptor drum, and forming color images by transferring the toner images onto sheets, the color image forming apparatus including: a photoreceptor drum which rotates around an axis; an exposure section which intermittently emits a light beam onto the cylindrical surface of the rotating photoreceptor drum along scanning lines parallel to the axis of the photoreceptor drum; a calculation section which calculates a printing ratio of a color image to be formed on one sheet, wherein the printing ratio is the ratio of the area covered by toner in the color image; and a timing control section which controls a timing when the exposure section emits the light beam in a direction of rotation of the photoreceptor drum based on the printing ratio calculated by the calculation section. | 12-24-2009 |