Patent application number | Description | Published |
20090123197 | IMAGE FORMING APPARATUS - An image forming apparatus includes first and second image bearing members on which a toner images are to be formed; a conveying member onto which the toner images are to be transferred; a conveying member position index detecting device for detecting a conveying member position index provided on the conveying member along the movement direction of the conveying member; an image bearing member position index detecting device for detecting the image bearing member position indices provided on the second image bearing member along a rotational direction of the second image bearing member; an adjusting device for adjusting a rotational speed of the second image bearing member; a controller for controlling the adjusting device so as to adjust a position of an image bearing member position index correspondingly to the conveying member position index, on the basis of detection results of the conveying member position index detecting device and the image bearing member position index detecting device; and an initializing portion for performing an initializing operation of the adjusting device when an amount of deviation between the conveying member position index and the corresponding image bearing member position index is out of a predetermined range. | 05-14-2009 |
20100209124 | IMAGE FORMING APPARATUS - An image forming apparatus which is capable of detecting the direction and amount of an image shift in the main scanning direction without wasting toner, to thereby provide a higher-quality image with reduced running costs. A conductor is disposed such that the conductor partially overlaps an electrostatic latent image line formed on a photosensitive drum in a manner extending in a main scanning direction of the photosensitive drum, while moving relative to the electrostatic latent image line. The conductor generates induced current by the relative motion. An image shift in the main scanning direction is detected based on a result of measurement of the induced current generated by the conductor. | 08-19-2010 |
20100321439 | RECORDING HEAD AND RECORDING APPARATUS USING THE RECORDING HEAD - The present invention provides a recording head that has a driving circuit performing driving by dividing a plurality of heaters into a plurality of blocks and supplying electric current on a block-by-block basis based on recording data; a constant current source applying a common bias current to each temperature sensor group obtained by dividing temperature sensors disposed in correspondence to each heater of a plurality of heaters into blocks; a voltage output circuit having a switching element that turns electric current supply to the temperature sensors of the selected temperature sensor group ON and OFF, and obtaining a voltage generated at both terminals of the selected temperature sensor by supplying an electric current to the temperature sensor; and an amplifier circuit amplifying the detection voltages. | 12-23-2010 |
20100321441 | PRINTING APPARATUS AND INK DISCHARGE FAILURE DETECTION METHOD - A printing apparatus and ink discharge failure detection method capable of precisely detecting temperature information corresponding to each nozzle are provided. Temperatures of respective electrothermal transducers (heaters) are measured on the basis of outputs from a plurality of sensors corresponding to the respective heaters. The temperatures of the heaters at a predetermined timing during a printing operation are predicted on the basis of the temperature change profiles of the respective heaters that are generated by energizing the heaters. A plurality of thresholds corresponding to nozzle states are generated on the basis of the predicted temperatures and the driving conditions of an inkjet printhead, and it is controlled to execute temperature measurement at the predetermined timing. A temperature measured under the control is compared with the respective generated thresholds, and the nozzle state is identified on the basis of the comparison results. | 12-23-2010 |
20120301168 | IMAGE FORMING APPARATUS AND CONTROLLING METHOD THEREFOR - An image forming apparatus includes a first station including a first photosensitive drum; a second station including a second photosensitive drum; an intermediate transfer member for receiving the first toner image from the first drum and the second toner image from the second drum sequentially; a first sensor configured to detect a first index image, on the intermediate transfer member; a second sensor for detecting a second index image on the second drum; a controller for controlling a peripheral speed of the second drum; an executing device for executing a test mode in which a first inclined test index image, and a second test inclined index image, wherein the controller controls image forming conditions for the first and second index images in accordance with outputs of the first second sensors in the test mode. | 11-29-2012 |
20140153980 | FIXING DEVICE FOR FIXING TONER ON SHEET BY HEATING TONER, AND IMAGE FORMING APPARATUS INCLUDING FIXING DEVICE - A secondary coil is attached to an end portion of a heating film. A space is formed inside a core member. A primary coil, which generates a magnetic field that causes the secondary coil to generate a current by electromagnetic induction, is arranged inside the space together with the secondary coil. | 06-05-2014 |
20140233970 | IMAGE FORMING APPARATUS - Latent image graduations formed on an intermediate transfer belt are read by a first sensor portion. Latent image graduations formed on a photoconductive drum are read by a second sensor portion. When an image is transferred from the photoconductive drum to the intermediate transfer belt on the basis of the information read by these sensor portions, the position of the image on the photoconductive drum is controlled to match the position of the image on the intermediate transfer belt. The first sensor portion and the second sensor portion are held integrally by the holding member. Accordingly, variations due to a temperature change of relative positions between the sensor portions or difference in vibrations of the respective sensor portions which may cause errors when aligning the images are reduced. | 08-21-2014 |
20140233990 | IMAGE FORMING APPARATUS - A first position information formed on an conveyance body is read by an information detecting portion, and a second position information formed on a second image carrier is read by the information detecting portion. A control is made such that a position of an image on the second image carrier matches with a position of an image on the conveyance body from information read by the information detecting portion in transferring the image from the second image carrier to the conveyance body. The information detecting portion is held by a hold member and are disposed at a transfer region. | 08-21-2014 |
20140348524 | HEATING APPARATUS FOR HEATING A TONER IMAGE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A non-contact power supply unit including a secondary coil supplies an alternating voltage to multiple heat generation layers provided in a heat generation film. In one of the heat generation layers, a loop is provided as a variable impedance circuit in which the impedance changes according to the frequency. A capacitance element in which the impedance changes according to the frequency is provided in the loop. The heat generation amounts of the heat generation layers are switched by changing the frequency of the alternating voltage generated in the secondary coil according to the size of the recording material that is the heating target. | 11-27-2014 |