Patent application number | Description | Published |
20080310891 | IMAGE FORMING APPARATUS - An image forming apparatus that adjusts an inclination angle of a supporting roller for regulating pulling of a belt member serving as an intermediate transfer belt or a recording-material supporting belt. The image forming apparatus changes a method of adjusting an inclination angle of the supporting roller in accordance with a winding angle of the belt member with respect to the supporting roller. | 12-18-2008 |
20090269104 | IMAGE FORMING APPARATUS - An image forming apparatus includes first and second rotatable image bearing members, a rotatable belt member which can abut on the first and second image bearing members, a drive mechanism to attach or separate the second image bearing member to or from the belt member, a rotation drive mechanism, and a controller controlling a rotational speed of the second image beating member so that the second image bearing member rotates with a predetermined circumferential speed difference with respect to the belt member at least when image formation is performed by the second image bearing member. When the second image bearing member abuts on or separates from the belt member, the controller controls the rotational speed of the second image bearing member so that a circumferential speed difference between rotational speeds of the second image bearing member and the belt member is smaller than the predetermined circumferential speed difference. | 10-29-2009 |
20090304411 | IMAGE FORMING APPARATUS - An image forming apparatus includes a first drive member located downstream of an image bearing member and upstream of a transfer portion and a second drive member located downstream of the transfer portion with respect to a direction of conveying a recording material on a conveyance belt member and configured to apply a driving force to the conveyance belt member. | 12-10-2009 |
20110182630 | IMAGE FORMING APPARATUS - An outer diameter of a transfer counter roller is made larger than that of a transfer roller to reduce an electrical discharge phenomenon and influence on a toner image. | 07-28-2011 |
20120275808 | IMAGE FORMING APPARATUS - An image forming apparatus includes a control unit having a first function and a second function. The first function controls a downstream transfer current to be less than an upstream transfer current. The second function controls the downstream transfer current to be greater than the upstream transfer current. | 11-01-2012 |
20120282001 | IMAGE FORMING APPARATUS - A first transfer inner roller and a first transfer outer roller are arranged such that the leading edge of a recording material is pressed against an intermediate transfer member on the downstream side of an upstream side transfer portion to change a traveling direction of the recording material. | 11-08-2012 |
20130094874 | IMAGE FORMING APPARATUS PREVENTING FAILURE OF RECORDING MATERIAL DETACHMENT FROM CONVEYANCE BELT - A method controls the timing of conveying a recording material to a conveyance belt so that a leading edge position of the recording material overlaps with a separation assisting toner image transferred on the conveyance belt in advance to prevent failure of recording material detachment from the conveyance belt. | 04-18-2013 |
20130156452 | IMAGE FORMING APPARATUS - Image forming apparatus includes a movable image bearing member, a first image forming unit, a second image forming unit, a detection member, an execution unit and an adjustment unit. A toner image for adjustment formed on an upstream photoreceptor is made to pass a photoreceptor while facing an area exposed by a downstream image forming unit and is detected by a detection unit. | 06-20-2013 |
20130183047 | IMAGE FORMING APPARATUS - An image forming apparatus including an image forming unit configured to form an image on the image bearing member, a transfer unit configured to transfer the image on the image bearing member to a recording material, a conveyance unit configured to convey the recording material to the transfer unit, a controller configured to form a test sheet by causing a test image to be formed on the image bearing member such that the test image has a predetermined density and causing the test image to be transferred to the recording material, and a determination unit configured to determine a conveyance speed of the recording material such that a density difference between a density of the test image on the test sheet and the predetermined density is less than or equal to a threshold value. | 07-18-2013 |
20130330096 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image bearing member; a toner image forming portion; a transfer member; a power source configured to apply a voltage to the transfer member so that a level of the voltage in a non-sheet-passing period in which a recording material is not in a transfer position is the same as that in a preceding sheet-passing period in which the recording material is in the transfer position; a current detecting member configured to detect a current flowing through the transfer member; and a controller configured to correct the voltage applied by the power source for the subsequent sheet-passing period on the basis of the detected current by the current detecting member in the non-sheet-passing period so that a predetermined current flows through the transfer member in the sheet-passing period. | 12-12-2013 |
20130336681 | IMAGE FORMING APPARATUS - An image forming apparatus comprising an image carrying member for carrying a toner image; a intermediary member for carrying the toner image transferred from said image carrying member; a first transfer member for transferring the toner image from said intermediary member onto a sheet, said first transfer member having first resistance and being contacted to said intermediary member; a second transfer member for transferring the toner image from said intermediary member onto the sheet, said second transfer member having second resistance higher than the first resistance and being contacted to said intermediary member at a position downstream of said first transfer member; and voltage applying means, connected to both of said first transfer member and said second transfer member, for applying the same voltage to said first transfer member and to said second transfer member to transfer the toner image onto the sheet. | 12-19-2013 |